12025cf9eSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2fa7d9493SBabu Moger /* 3d9f6e12fSIngo Molnar * User interface for Resource Allocation in Resource Director Technology(RDT) 4fa7d9493SBabu Moger * 5fa7d9493SBabu Moger * Copyright (C) 2016 Intel Corporation 6fa7d9493SBabu Moger * 7fa7d9493SBabu Moger * Author: Fenghua Yu <fenghua.yu@intel.com> 8fa7d9493SBabu Moger * 9fa7d9493SBabu Moger * More information about RDT be found in the Intel (R) x86 Architecture 10fa7d9493SBabu Moger * Software Developer Manual. 11fa7d9493SBabu Moger */ 12fa7d9493SBabu Moger 13fa7d9493SBabu Moger #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 14fa7d9493SBabu Moger 15fa7d9493SBabu Moger #include <linux/cacheinfo.h> 16fa7d9493SBabu Moger #include <linux/cpu.h> 17fa7d9493SBabu Moger #include <linux/debugfs.h> 18fa7d9493SBabu Moger #include <linux/fs.h> 1923bf1b6bSDavid Howells #include <linux/fs_parser.h> 20fa7d9493SBabu Moger #include <linux/sysfs.h> 21fa7d9493SBabu Moger #include <linux/kernfs.h> 22fa7d9493SBabu Moger #include <linux/seq_buf.h> 23fa7d9493SBabu Moger #include <linux/seq_file.h> 24fa7d9493SBabu Moger #include <linux/sched/signal.h> 25fa7d9493SBabu Moger #include <linux/sched/task.h> 26fa7d9493SBabu Moger #include <linux/slab.h> 27fa7d9493SBabu Moger #include <linux/task_work.h> 2823bf1b6bSDavid Howells #include <linux/user_namespace.h> 29fa7d9493SBabu Moger 30fa7d9493SBabu Moger #include <uapi/linux/magic.h> 31fa7d9493SBabu Moger 328dd97c65SReinette Chatre #include <asm/resctrl.h> 33fa7d9493SBabu Moger #include "internal.h" 34fa7d9493SBabu Moger 35fa7d9493SBabu Moger DEFINE_STATIC_KEY_FALSE(rdt_enable_key); 36fa7d9493SBabu Moger DEFINE_STATIC_KEY_FALSE(rdt_mon_enable_key); 37fa7d9493SBabu Moger DEFINE_STATIC_KEY_FALSE(rdt_alloc_enable_key); 38fa7d9493SBabu Moger static struct kernfs_root *rdt_root; 39fa7d9493SBabu Moger struct rdtgroup rdtgroup_default; 40fa7d9493SBabu Moger LIST_HEAD(rdt_all_groups); 41fa7d9493SBabu Moger 42cdb9ebc9SJames Morse /* list of entries for the schemata file */ 43cdb9ebc9SJames Morse LIST_HEAD(resctrl_schema_all); 44cdb9ebc9SJames Morse 45fa7d9493SBabu Moger /* Kernel fs node for "info" directory under root */ 46fa7d9493SBabu Moger static struct kernfs_node *kn_info; 47fa7d9493SBabu Moger 48fa7d9493SBabu Moger /* Kernel fs node for "mon_groups" directory under root */ 49fa7d9493SBabu Moger static struct kernfs_node *kn_mongrp; 50fa7d9493SBabu Moger 51fa7d9493SBabu Moger /* Kernel fs node for "mon_data" directory under root */ 52fa7d9493SBabu Moger static struct kernfs_node *kn_mondata; 53fa7d9493SBabu Moger 54fa7d9493SBabu Moger static struct seq_buf last_cmd_status; 55fa7d9493SBabu Moger static char last_cmd_status_buf[512]; 56fa7d9493SBabu Moger 57fa7d9493SBabu Moger struct dentry *debugfs_resctrl; 58fa7d9493SBabu Moger 59fa7d9493SBabu Moger void rdt_last_cmd_clear(void) 60fa7d9493SBabu Moger { 61fa7d9493SBabu Moger lockdep_assert_held(&rdtgroup_mutex); 62fa7d9493SBabu Moger seq_buf_clear(&last_cmd_status); 63fa7d9493SBabu Moger } 64fa7d9493SBabu Moger 65fa7d9493SBabu Moger void rdt_last_cmd_puts(const char *s) 66fa7d9493SBabu Moger { 67fa7d9493SBabu Moger lockdep_assert_held(&rdtgroup_mutex); 68fa7d9493SBabu Moger seq_buf_puts(&last_cmd_status, s); 69fa7d9493SBabu Moger } 70fa7d9493SBabu Moger 71fa7d9493SBabu Moger void rdt_last_cmd_printf(const char *fmt, ...) 72fa7d9493SBabu Moger { 73fa7d9493SBabu Moger va_list ap; 74fa7d9493SBabu Moger 75fa7d9493SBabu Moger va_start(ap, fmt); 76fa7d9493SBabu Moger lockdep_assert_held(&rdtgroup_mutex); 77fa7d9493SBabu Moger seq_buf_vprintf(&last_cmd_status, fmt, ap); 78fa7d9493SBabu Moger va_end(ap); 79fa7d9493SBabu Moger } 80fa7d9493SBabu Moger 81fa7d9493SBabu Moger /* 82fa7d9493SBabu Moger * Trivial allocator for CLOSIDs. Since h/w only supports a small number, 83fa7d9493SBabu Moger * we can keep a bitmap of free CLOSIDs in a single integer. 84fa7d9493SBabu Moger * 85fa7d9493SBabu Moger * Using a global CLOSID across all resources has some advantages and 86fa7d9493SBabu Moger * some drawbacks: 87fa7d9493SBabu Moger * + We can simply set "current->closid" to assign a task to a resource 88fa7d9493SBabu Moger * group. 89fa7d9493SBabu Moger * + Context switch code can avoid extra memory references deciding which 90fa7d9493SBabu Moger * CLOSID to load into the PQR_ASSOC MSR 91fa7d9493SBabu Moger * - We give up some options in configuring resource groups across multi-socket 92fa7d9493SBabu Moger * systems. 93fa7d9493SBabu Moger * - Our choices on how to configure each resource become progressively more 94fa7d9493SBabu Moger * limited as the number of resources grows. 95fa7d9493SBabu Moger */ 96fa7d9493SBabu Moger static int closid_free_map; 97fa7d9493SBabu Moger static int closid_free_map_len; 98fa7d9493SBabu Moger 99fa7d9493SBabu Moger int closids_supported(void) 100fa7d9493SBabu Moger { 101fa7d9493SBabu Moger return closid_free_map_len; 102fa7d9493SBabu Moger } 103fa7d9493SBabu Moger 104fa7d9493SBabu Moger static void closid_init(void) 105fa7d9493SBabu Moger { 106331ebe4cSJames Morse struct resctrl_schema *s; 107eb6f3187SJames Morse u32 rdt_min_closid = 32; 108fa7d9493SBabu Moger 109fa7d9493SBabu Moger /* Compute rdt_min_closid across all resources */ 1103183e87cSJames Morse list_for_each_entry(s, &resctrl_schema_all, list) 1113183e87cSJames Morse rdt_min_closid = min(rdt_min_closid, s->num_closid); 112fa7d9493SBabu Moger 113fa7d9493SBabu Moger closid_free_map = BIT_MASK(rdt_min_closid) - 1; 114fa7d9493SBabu Moger 115fa7d9493SBabu Moger /* CLOSID 0 is always reserved for the default group */ 116fa7d9493SBabu Moger closid_free_map &= ~1; 117fa7d9493SBabu Moger closid_free_map_len = rdt_min_closid; 118fa7d9493SBabu Moger } 119fa7d9493SBabu Moger 120fa7d9493SBabu Moger static int closid_alloc(void) 121fa7d9493SBabu Moger { 122fa7d9493SBabu Moger u32 closid = ffs(closid_free_map); 123fa7d9493SBabu Moger 124fa7d9493SBabu Moger if (closid == 0) 125fa7d9493SBabu Moger return -ENOSPC; 126fa7d9493SBabu Moger closid--; 127fa7d9493SBabu Moger closid_free_map &= ~(1 << closid); 128fa7d9493SBabu Moger 129fa7d9493SBabu Moger return closid; 130fa7d9493SBabu Moger } 131fa7d9493SBabu Moger 132fa7d9493SBabu Moger void closid_free(int closid) 133fa7d9493SBabu Moger { 134fa7d9493SBabu Moger closid_free_map |= 1 << closid; 135fa7d9493SBabu Moger } 136fa7d9493SBabu Moger 137fa7d9493SBabu Moger /** 138fa7d9493SBabu Moger * closid_allocated - test if provided closid is in use 139fa7d9493SBabu Moger * @closid: closid to be tested 140fa7d9493SBabu Moger * 141fa7d9493SBabu Moger * Return: true if @closid is currently associated with a resource group, 142fa7d9493SBabu Moger * false if @closid is free 143fa7d9493SBabu Moger */ 144fa7d9493SBabu Moger static bool closid_allocated(unsigned int closid) 145fa7d9493SBabu Moger { 146fa7d9493SBabu Moger return (closid_free_map & (1 << closid)) == 0; 147fa7d9493SBabu Moger } 148fa7d9493SBabu Moger 149fa7d9493SBabu Moger /** 150fa7d9493SBabu Moger * rdtgroup_mode_by_closid - Return mode of resource group with closid 151fa7d9493SBabu Moger * @closid: closid if the resource group 152fa7d9493SBabu Moger * 153fa7d9493SBabu Moger * Each resource group is associated with a @closid. Here the mode 154fa7d9493SBabu Moger * of a resource group can be queried by searching for it using its closid. 155fa7d9493SBabu Moger * 156fa7d9493SBabu Moger * Return: mode as &enum rdtgrp_mode of resource group with closid @closid 157fa7d9493SBabu Moger */ 158fa7d9493SBabu Moger enum rdtgrp_mode rdtgroup_mode_by_closid(int closid) 159fa7d9493SBabu Moger { 160fa7d9493SBabu Moger struct rdtgroup *rdtgrp; 161fa7d9493SBabu Moger 162fa7d9493SBabu Moger list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) { 163fa7d9493SBabu Moger if (rdtgrp->closid == closid) 164fa7d9493SBabu Moger return rdtgrp->mode; 165fa7d9493SBabu Moger } 166fa7d9493SBabu Moger 167fa7d9493SBabu Moger return RDT_NUM_MODES; 168fa7d9493SBabu Moger } 169fa7d9493SBabu Moger 170fa7d9493SBabu Moger static const char * const rdt_mode_str[] = { 171fa7d9493SBabu Moger [RDT_MODE_SHAREABLE] = "shareable", 172fa7d9493SBabu Moger [RDT_MODE_EXCLUSIVE] = "exclusive", 173fa7d9493SBabu Moger [RDT_MODE_PSEUDO_LOCKSETUP] = "pseudo-locksetup", 174fa7d9493SBabu Moger [RDT_MODE_PSEUDO_LOCKED] = "pseudo-locked", 175fa7d9493SBabu Moger }; 176fa7d9493SBabu Moger 177fa7d9493SBabu Moger /** 178fa7d9493SBabu Moger * rdtgroup_mode_str - Return the string representation of mode 179fa7d9493SBabu Moger * @mode: the resource group mode as &enum rdtgroup_mode 180fa7d9493SBabu Moger * 181fa7d9493SBabu Moger * Return: string representation of valid mode, "unknown" otherwise 182fa7d9493SBabu Moger */ 183fa7d9493SBabu Moger static const char *rdtgroup_mode_str(enum rdtgrp_mode mode) 184fa7d9493SBabu Moger { 185fa7d9493SBabu Moger if (mode < RDT_MODE_SHAREABLE || mode >= RDT_NUM_MODES) 186fa7d9493SBabu Moger return "unknown"; 187fa7d9493SBabu Moger 188fa7d9493SBabu Moger return rdt_mode_str[mode]; 189fa7d9493SBabu Moger } 190fa7d9493SBabu Moger 191fa7d9493SBabu Moger /* set uid and gid of rdtgroup dirs and files to that of the creator */ 192fa7d9493SBabu Moger static int rdtgroup_kn_set_ugid(struct kernfs_node *kn) 193fa7d9493SBabu Moger { 194fa7d9493SBabu Moger struct iattr iattr = { .ia_valid = ATTR_UID | ATTR_GID, 195fa7d9493SBabu Moger .ia_uid = current_fsuid(), 196fa7d9493SBabu Moger .ia_gid = current_fsgid(), }; 197fa7d9493SBabu Moger 198fa7d9493SBabu Moger if (uid_eq(iattr.ia_uid, GLOBAL_ROOT_UID) && 199fa7d9493SBabu Moger gid_eq(iattr.ia_gid, GLOBAL_ROOT_GID)) 200fa7d9493SBabu Moger return 0; 201fa7d9493SBabu Moger 202fa7d9493SBabu Moger return kernfs_setattr(kn, &iattr); 203fa7d9493SBabu Moger } 204fa7d9493SBabu Moger 205fa7d9493SBabu Moger static int rdtgroup_add_file(struct kernfs_node *parent_kn, struct rftype *rft) 206fa7d9493SBabu Moger { 207fa7d9493SBabu Moger struct kernfs_node *kn; 208fa7d9493SBabu Moger int ret; 209fa7d9493SBabu Moger 210fa7d9493SBabu Moger kn = __kernfs_create_file(parent_kn, rft->name, rft->mode, 211fa7d9493SBabu Moger GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, 212fa7d9493SBabu Moger 0, rft->kf_ops, rft, NULL, NULL); 213fa7d9493SBabu Moger if (IS_ERR(kn)) 214fa7d9493SBabu Moger return PTR_ERR(kn); 215fa7d9493SBabu Moger 216fa7d9493SBabu Moger ret = rdtgroup_kn_set_ugid(kn); 217fa7d9493SBabu Moger if (ret) { 218fa7d9493SBabu Moger kernfs_remove(kn); 219fa7d9493SBabu Moger return ret; 220fa7d9493SBabu Moger } 221fa7d9493SBabu Moger 222fa7d9493SBabu Moger return 0; 223fa7d9493SBabu Moger } 224fa7d9493SBabu Moger 225fa7d9493SBabu Moger static int rdtgroup_seqfile_show(struct seq_file *m, void *arg) 226fa7d9493SBabu Moger { 227fa7d9493SBabu Moger struct kernfs_open_file *of = m->private; 228fa7d9493SBabu Moger struct rftype *rft = of->kn->priv; 229fa7d9493SBabu Moger 230fa7d9493SBabu Moger if (rft->seq_show) 231fa7d9493SBabu Moger return rft->seq_show(of, m, arg); 232fa7d9493SBabu Moger return 0; 233fa7d9493SBabu Moger } 234fa7d9493SBabu Moger 235fa7d9493SBabu Moger static ssize_t rdtgroup_file_write(struct kernfs_open_file *of, char *buf, 236fa7d9493SBabu Moger size_t nbytes, loff_t off) 237fa7d9493SBabu Moger { 238fa7d9493SBabu Moger struct rftype *rft = of->kn->priv; 239fa7d9493SBabu Moger 240fa7d9493SBabu Moger if (rft->write) 241fa7d9493SBabu Moger return rft->write(of, buf, nbytes, off); 242fa7d9493SBabu Moger 243fa7d9493SBabu Moger return -EINVAL; 244fa7d9493SBabu Moger } 245fa7d9493SBabu Moger 2462002d295SRikard Falkeborn static const struct kernfs_ops rdtgroup_kf_single_ops = { 247fa7d9493SBabu Moger .atomic_write_len = PAGE_SIZE, 248fa7d9493SBabu Moger .write = rdtgroup_file_write, 249fa7d9493SBabu Moger .seq_show = rdtgroup_seqfile_show, 250fa7d9493SBabu Moger }; 251fa7d9493SBabu Moger 2522002d295SRikard Falkeborn static const struct kernfs_ops kf_mondata_ops = { 253fa7d9493SBabu Moger .atomic_write_len = PAGE_SIZE, 254fa7d9493SBabu Moger .seq_show = rdtgroup_mondata_show, 255fa7d9493SBabu Moger }; 256fa7d9493SBabu Moger 257fa7d9493SBabu Moger static bool is_cpu_list(struct kernfs_open_file *of) 258fa7d9493SBabu Moger { 259fa7d9493SBabu Moger struct rftype *rft = of->kn->priv; 260fa7d9493SBabu Moger 261fa7d9493SBabu Moger return rft->flags & RFTYPE_FLAGS_CPUS_LIST; 262fa7d9493SBabu Moger } 263fa7d9493SBabu Moger 264fa7d9493SBabu Moger static int rdtgroup_cpus_show(struct kernfs_open_file *of, 265fa7d9493SBabu Moger struct seq_file *s, void *v) 266fa7d9493SBabu Moger { 267fa7d9493SBabu Moger struct rdtgroup *rdtgrp; 268fa7d9493SBabu Moger struct cpumask *mask; 269fa7d9493SBabu Moger int ret = 0; 270fa7d9493SBabu Moger 271fa7d9493SBabu Moger rdtgrp = rdtgroup_kn_lock_live(of->kn); 272fa7d9493SBabu Moger 273fa7d9493SBabu Moger if (rdtgrp) { 274fa7d9493SBabu Moger if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) { 275fa7d9493SBabu Moger if (!rdtgrp->plr->d) { 276fa7d9493SBabu Moger rdt_last_cmd_clear(); 277fa7d9493SBabu Moger rdt_last_cmd_puts("Cache domain offline\n"); 278fa7d9493SBabu Moger ret = -ENODEV; 279fa7d9493SBabu Moger } else { 280fa7d9493SBabu Moger mask = &rdtgrp->plr->d->cpu_mask; 281fa7d9493SBabu Moger seq_printf(s, is_cpu_list(of) ? 282fa7d9493SBabu Moger "%*pbl\n" : "%*pb\n", 283fa7d9493SBabu Moger cpumask_pr_args(mask)); 284fa7d9493SBabu Moger } 285fa7d9493SBabu Moger } else { 286fa7d9493SBabu Moger seq_printf(s, is_cpu_list(of) ? "%*pbl\n" : "%*pb\n", 287fa7d9493SBabu Moger cpumask_pr_args(&rdtgrp->cpu_mask)); 288fa7d9493SBabu Moger } 289fa7d9493SBabu Moger } else { 290fa7d9493SBabu Moger ret = -ENOENT; 291fa7d9493SBabu Moger } 292fa7d9493SBabu Moger rdtgroup_kn_unlock(of->kn); 293fa7d9493SBabu Moger 294fa7d9493SBabu Moger return ret; 295fa7d9493SBabu Moger } 296fa7d9493SBabu Moger 297fa7d9493SBabu Moger /* 298352940ecSBabu Moger * This is safe against resctrl_sched_in() called from __switch_to() 299fa7d9493SBabu Moger * because __switch_to() is executed with interrupts disabled. A local call 300d9f6e12fSIngo Molnar * from update_closid_rmid() is protected against __switch_to() because 301fa7d9493SBabu Moger * preemption is disabled. 302fa7d9493SBabu Moger */ 303fa7d9493SBabu Moger static void update_cpu_closid_rmid(void *info) 304fa7d9493SBabu Moger { 305fa7d9493SBabu Moger struct rdtgroup *r = info; 306fa7d9493SBabu Moger 307fa7d9493SBabu Moger if (r) { 308fa7d9493SBabu Moger this_cpu_write(pqr_state.default_closid, r->closid); 309fa7d9493SBabu Moger this_cpu_write(pqr_state.default_rmid, r->mon.rmid); 310fa7d9493SBabu Moger } 311fa7d9493SBabu Moger 312fa7d9493SBabu Moger /* 313fa7d9493SBabu Moger * We cannot unconditionally write the MSR because the current 314fa7d9493SBabu Moger * executing task might have its own closid selected. Just reuse 315fa7d9493SBabu Moger * the context switch code. 316fa7d9493SBabu Moger */ 317352940ecSBabu Moger resctrl_sched_in(); 318fa7d9493SBabu Moger } 319fa7d9493SBabu Moger 320fa7d9493SBabu Moger /* 321fa7d9493SBabu Moger * Update the PGR_ASSOC MSR on all cpus in @cpu_mask, 322fa7d9493SBabu Moger * 323fa7d9493SBabu Moger * Per task closids/rmids must have been set up before calling this function. 324fa7d9493SBabu Moger */ 325fa7d9493SBabu Moger static void 326fa7d9493SBabu Moger update_closid_rmid(const struct cpumask *cpu_mask, struct rdtgroup *r) 327fa7d9493SBabu Moger { 328fc3b618cSBabu Moger on_each_cpu_mask(cpu_mask, update_cpu_closid_rmid, r, 1); 329fa7d9493SBabu Moger } 330fa7d9493SBabu Moger 331fa7d9493SBabu Moger static int cpus_mon_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask, 332fa7d9493SBabu Moger cpumask_var_t tmpmask) 333fa7d9493SBabu Moger { 334fa7d9493SBabu Moger struct rdtgroup *prgrp = rdtgrp->mon.parent, *crgrp; 335fa7d9493SBabu Moger struct list_head *head; 336fa7d9493SBabu Moger 337fa7d9493SBabu Moger /* Check whether cpus belong to parent ctrl group */ 338fa7d9493SBabu Moger cpumask_andnot(tmpmask, newmask, &prgrp->cpu_mask); 3393a5ff1f6SYury Norov if (!cpumask_empty(tmpmask)) { 340723f1a0dSBabu Moger rdt_last_cmd_puts("Can only add CPUs to mongroup that belong to parent\n"); 341fa7d9493SBabu Moger return -EINVAL; 342fa7d9493SBabu Moger } 343fa7d9493SBabu Moger 344fa7d9493SBabu Moger /* Check whether cpus are dropped from this group */ 345fa7d9493SBabu Moger cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask); 3463a5ff1f6SYury Norov if (!cpumask_empty(tmpmask)) { 347fa7d9493SBabu Moger /* Give any dropped cpus to parent rdtgroup */ 348fa7d9493SBabu Moger cpumask_or(&prgrp->cpu_mask, &prgrp->cpu_mask, tmpmask); 349fa7d9493SBabu Moger update_closid_rmid(tmpmask, prgrp); 350fa7d9493SBabu Moger } 351fa7d9493SBabu Moger 352fa7d9493SBabu Moger /* 353fa7d9493SBabu Moger * If we added cpus, remove them from previous group that owned them 354fa7d9493SBabu Moger * and update per-cpu rmid 355fa7d9493SBabu Moger */ 356fa7d9493SBabu Moger cpumask_andnot(tmpmask, newmask, &rdtgrp->cpu_mask); 3573a5ff1f6SYury Norov if (!cpumask_empty(tmpmask)) { 358fa7d9493SBabu Moger head = &prgrp->mon.crdtgrp_list; 359fa7d9493SBabu Moger list_for_each_entry(crgrp, head, mon.crdtgrp_list) { 360fa7d9493SBabu Moger if (crgrp == rdtgrp) 361fa7d9493SBabu Moger continue; 362fa7d9493SBabu Moger cpumask_andnot(&crgrp->cpu_mask, &crgrp->cpu_mask, 363fa7d9493SBabu Moger tmpmask); 364fa7d9493SBabu Moger } 365fa7d9493SBabu Moger update_closid_rmid(tmpmask, rdtgrp); 366fa7d9493SBabu Moger } 367fa7d9493SBabu Moger 368fa7d9493SBabu Moger /* Done pushing/pulling - update this group with new mask */ 369fa7d9493SBabu Moger cpumask_copy(&rdtgrp->cpu_mask, newmask); 370fa7d9493SBabu Moger 371fa7d9493SBabu Moger return 0; 372fa7d9493SBabu Moger } 373fa7d9493SBabu Moger 374fa7d9493SBabu Moger static void cpumask_rdtgrp_clear(struct rdtgroup *r, struct cpumask *m) 375fa7d9493SBabu Moger { 376fa7d9493SBabu Moger struct rdtgroup *crgrp; 377fa7d9493SBabu Moger 378fa7d9493SBabu Moger cpumask_andnot(&r->cpu_mask, &r->cpu_mask, m); 379fa7d9493SBabu Moger /* update the child mon group masks as well*/ 380fa7d9493SBabu Moger list_for_each_entry(crgrp, &r->mon.crdtgrp_list, mon.crdtgrp_list) 381fa7d9493SBabu Moger cpumask_and(&crgrp->cpu_mask, &r->cpu_mask, &crgrp->cpu_mask); 382fa7d9493SBabu Moger } 383fa7d9493SBabu Moger 384fa7d9493SBabu Moger static int cpus_ctrl_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask, 385fa7d9493SBabu Moger cpumask_var_t tmpmask, cpumask_var_t tmpmask1) 386fa7d9493SBabu Moger { 387fa7d9493SBabu Moger struct rdtgroup *r, *crgrp; 388fa7d9493SBabu Moger struct list_head *head; 389fa7d9493SBabu Moger 390fa7d9493SBabu Moger /* Check whether cpus are dropped from this group */ 391fa7d9493SBabu Moger cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask); 3923a5ff1f6SYury Norov if (!cpumask_empty(tmpmask)) { 393fa7d9493SBabu Moger /* Can't drop from default group */ 394fa7d9493SBabu Moger if (rdtgrp == &rdtgroup_default) { 395fa7d9493SBabu Moger rdt_last_cmd_puts("Can't drop CPUs from default group\n"); 396fa7d9493SBabu Moger return -EINVAL; 397fa7d9493SBabu Moger } 398fa7d9493SBabu Moger 399fa7d9493SBabu Moger /* Give any dropped cpus to rdtgroup_default */ 400fa7d9493SBabu Moger cpumask_or(&rdtgroup_default.cpu_mask, 401fa7d9493SBabu Moger &rdtgroup_default.cpu_mask, tmpmask); 402fa7d9493SBabu Moger update_closid_rmid(tmpmask, &rdtgroup_default); 403fa7d9493SBabu Moger } 404fa7d9493SBabu Moger 405fa7d9493SBabu Moger /* 406fa7d9493SBabu Moger * If we added cpus, remove them from previous group and 407fa7d9493SBabu Moger * the prev group's child groups that owned them 408fa7d9493SBabu Moger * and update per-cpu closid/rmid. 409fa7d9493SBabu Moger */ 410fa7d9493SBabu Moger cpumask_andnot(tmpmask, newmask, &rdtgrp->cpu_mask); 4113a5ff1f6SYury Norov if (!cpumask_empty(tmpmask)) { 412fa7d9493SBabu Moger list_for_each_entry(r, &rdt_all_groups, rdtgroup_list) { 413fa7d9493SBabu Moger if (r == rdtgrp) 414fa7d9493SBabu Moger continue; 415fa7d9493SBabu Moger cpumask_and(tmpmask1, &r->cpu_mask, tmpmask); 4163a5ff1f6SYury Norov if (!cpumask_empty(tmpmask1)) 417fa7d9493SBabu Moger cpumask_rdtgrp_clear(r, tmpmask1); 418fa7d9493SBabu Moger } 419fa7d9493SBabu Moger update_closid_rmid(tmpmask, rdtgrp); 420fa7d9493SBabu Moger } 421fa7d9493SBabu Moger 422fa7d9493SBabu Moger /* Done pushing/pulling - update this group with new mask */ 423fa7d9493SBabu Moger cpumask_copy(&rdtgrp->cpu_mask, newmask); 424fa7d9493SBabu Moger 425fa7d9493SBabu Moger /* 426fa7d9493SBabu Moger * Clear child mon group masks since there is a new parent mask 427fa7d9493SBabu Moger * now and update the rmid for the cpus the child lost. 428fa7d9493SBabu Moger */ 429fa7d9493SBabu Moger head = &rdtgrp->mon.crdtgrp_list; 430fa7d9493SBabu Moger list_for_each_entry(crgrp, head, mon.crdtgrp_list) { 431fa7d9493SBabu Moger cpumask_and(tmpmask, &rdtgrp->cpu_mask, &crgrp->cpu_mask); 432fa7d9493SBabu Moger update_closid_rmid(tmpmask, rdtgrp); 433fa7d9493SBabu Moger cpumask_clear(&crgrp->cpu_mask); 434fa7d9493SBabu Moger } 435fa7d9493SBabu Moger 436fa7d9493SBabu Moger return 0; 437fa7d9493SBabu Moger } 438fa7d9493SBabu Moger 439fa7d9493SBabu Moger static ssize_t rdtgroup_cpus_write(struct kernfs_open_file *of, 440fa7d9493SBabu Moger char *buf, size_t nbytes, loff_t off) 441fa7d9493SBabu Moger { 442fa7d9493SBabu Moger cpumask_var_t tmpmask, newmask, tmpmask1; 443fa7d9493SBabu Moger struct rdtgroup *rdtgrp; 444fa7d9493SBabu Moger int ret; 445fa7d9493SBabu Moger 446fa7d9493SBabu Moger if (!buf) 447fa7d9493SBabu Moger return -EINVAL; 448fa7d9493SBabu Moger 449fa7d9493SBabu Moger if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL)) 450fa7d9493SBabu Moger return -ENOMEM; 451fa7d9493SBabu Moger if (!zalloc_cpumask_var(&newmask, GFP_KERNEL)) { 452fa7d9493SBabu Moger free_cpumask_var(tmpmask); 453fa7d9493SBabu Moger return -ENOMEM; 454fa7d9493SBabu Moger } 455fa7d9493SBabu Moger if (!zalloc_cpumask_var(&tmpmask1, GFP_KERNEL)) { 456fa7d9493SBabu Moger free_cpumask_var(tmpmask); 457fa7d9493SBabu Moger free_cpumask_var(newmask); 458fa7d9493SBabu Moger return -ENOMEM; 459fa7d9493SBabu Moger } 460fa7d9493SBabu Moger 461fa7d9493SBabu Moger rdtgrp = rdtgroup_kn_lock_live(of->kn); 462fa7d9493SBabu Moger if (!rdtgrp) { 463fa7d9493SBabu Moger ret = -ENOENT; 464fa7d9493SBabu Moger goto unlock; 465fa7d9493SBabu Moger } 466fa7d9493SBabu Moger 467fa7d9493SBabu Moger if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED || 468fa7d9493SBabu Moger rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) { 469fa7d9493SBabu Moger ret = -EINVAL; 470723f1a0dSBabu Moger rdt_last_cmd_puts("Pseudo-locking in progress\n"); 471fa7d9493SBabu Moger goto unlock; 472fa7d9493SBabu Moger } 473fa7d9493SBabu Moger 474fa7d9493SBabu Moger if (is_cpu_list(of)) 475fa7d9493SBabu Moger ret = cpulist_parse(buf, newmask); 476fa7d9493SBabu Moger else 477fa7d9493SBabu Moger ret = cpumask_parse(buf, newmask); 478fa7d9493SBabu Moger 479fa7d9493SBabu Moger if (ret) { 480723f1a0dSBabu Moger rdt_last_cmd_puts("Bad CPU list/mask\n"); 481fa7d9493SBabu Moger goto unlock; 482fa7d9493SBabu Moger } 483fa7d9493SBabu Moger 484fa7d9493SBabu Moger /* check that user didn't specify any offline cpus */ 485fa7d9493SBabu Moger cpumask_andnot(tmpmask, newmask, cpu_online_mask); 4863a5ff1f6SYury Norov if (!cpumask_empty(tmpmask)) { 487fa7d9493SBabu Moger ret = -EINVAL; 488723f1a0dSBabu Moger rdt_last_cmd_puts("Can only assign online CPUs\n"); 489fa7d9493SBabu Moger goto unlock; 490fa7d9493SBabu Moger } 491fa7d9493SBabu Moger 492fa7d9493SBabu Moger if (rdtgrp->type == RDTCTRL_GROUP) 493fa7d9493SBabu Moger ret = cpus_ctrl_write(rdtgrp, newmask, tmpmask, tmpmask1); 494fa7d9493SBabu Moger else if (rdtgrp->type == RDTMON_GROUP) 495fa7d9493SBabu Moger ret = cpus_mon_write(rdtgrp, newmask, tmpmask); 496fa7d9493SBabu Moger else 497fa7d9493SBabu Moger ret = -EINVAL; 498fa7d9493SBabu Moger 499fa7d9493SBabu Moger unlock: 500fa7d9493SBabu Moger rdtgroup_kn_unlock(of->kn); 501fa7d9493SBabu Moger free_cpumask_var(tmpmask); 502fa7d9493SBabu Moger free_cpumask_var(newmask); 503fa7d9493SBabu Moger free_cpumask_var(tmpmask1); 504fa7d9493SBabu Moger 505fa7d9493SBabu Moger return ret ?: nbytes; 506fa7d9493SBabu Moger } 507fa7d9493SBabu Moger 50875899924SXiaochen Shen /** 50975899924SXiaochen Shen * rdtgroup_remove - the helper to remove resource group safely 51075899924SXiaochen Shen * @rdtgrp: resource group to remove 51175899924SXiaochen Shen * 51275899924SXiaochen Shen * On resource group creation via a mkdir, an extra kernfs_node reference is 51375899924SXiaochen Shen * taken to ensure that the rdtgroup structure remains accessible for the 51475899924SXiaochen Shen * rdtgroup_kn_unlock() calls where it is removed. 51575899924SXiaochen Shen * 51675899924SXiaochen Shen * Drop the extra reference here, then free the rdtgroup structure. 51775899924SXiaochen Shen * 51875899924SXiaochen Shen * Return: void 51975899924SXiaochen Shen */ 52075899924SXiaochen Shen static void rdtgroup_remove(struct rdtgroup *rdtgrp) 52175899924SXiaochen Shen { 52275899924SXiaochen Shen kernfs_put(rdtgrp->kn); 52375899924SXiaochen Shen kfree(rdtgrp); 52475899924SXiaochen Shen } 52575899924SXiaochen Shen 526ae28d1aaSFenghua Yu static void _update_task_closid_rmid(void *task) 527fa7d9493SBabu Moger { 528fa7d9493SBabu Moger /* 529ae28d1aaSFenghua Yu * If the task is still current on this CPU, update PQR_ASSOC MSR. 530ae28d1aaSFenghua Yu * Otherwise, the MSR is updated when the task is scheduled in. 531fa7d9493SBabu Moger */ 532ae28d1aaSFenghua Yu if (task == current) 533ae28d1aaSFenghua Yu resctrl_sched_in(); 534fa7d9493SBabu Moger } 535fa7d9493SBabu Moger 536ae28d1aaSFenghua Yu static void update_task_closid_rmid(struct task_struct *t) 537ae28d1aaSFenghua Yu { 538ae28d1aaSFenghua Yu if (IS_ENABLED(CONFIG_SMP) && task_curr(t)) 539ae28d1aaSFenghua Yu smp_call_function_single(task_cpu(t), _update_task_closid_rmid, t, 1); 540ae28d1aaSFenghua Yu else 541ae28d1aaSFenghua Yu _update_task_closid_rmid(t); 542fa7d9493SBabu Moger } 543fa7d9493SBabu Moger 544fa7d9493SBabu Moger static int __rdtgroup_move_task(struct task_struct *tsk, 545fa7d9493SBabu Moger struct rdtgroup *rdtgrp) 546fa7d9493SBabu Moger { 547a0195f31SFenghua Yu /* If the task is already in rdtgrp, no need to move the task. */ 548a0195f31SFenghua Yu if ((rdtgrp->type == RDTCTRL_GROUP && tsk->closid == rdtgrp->closid && 549a0195f31SFenghua Yu tsk->rmid == rdtgrp->mon.rmid) || 550a0195f31SFenghua Yu (rdtgrp->type == RDTMON_GROUP && tsk->rmid == rdtgrp->mon.rmid && 551a0195f31SFenghua Yu tsk->closid == rdtgrp->mon.parent->closid)) 552a0195f31SFenghua Yu return 0; 553a0195f31SFenghua Yu 554fa7d9493SBabu Moger /* 555ae28d1aaSFenghua Yu * Set the task's closid/rmid before the PQR_ASSOC MSR can be 556ae28d1aaSFenghua Yu * updated by them. 557ae28d1aaSFenghua Yu * 558ae28d1aaSFenghua Yu * For ctrl_mon groups, move both closid and rmid. 559fa7d9493SBabu Moger * For monitor groups, can move the tasks only from 560fa7d9493SBabu Moger * their parent CTRL group. 561fa7d9493SBabu Moger */ 562ae28d1aaSFenghua Yu 563fa7d9493SBabu Moger if (rdtgrp->type == RDTCTRL_GROUP) { 5646d3b47ddSValentin Schneider WRITE_ONCE(tsk->closid, rdtgrp->closid); 5656d3b47ddSValentin Schneider WRITE_ONCE(tsk->rmid, rdtgrp->mon.rmid); 566fa7d9493SBabu Moger } else if (rdtgrp->type == RDTMON_GROUP) { 567fa7d9493SBabu Moger if (rdtgrp->mon.parent->closid == tsk->closid) { 5686d3b47ddSValentin Schneider WRITE_ONCE(tsk->rmid, rdtgrp->mon.rmid); 569fa7d9493SBabu Moger } else { 570fa7d9493SBabu Moger rdt_last_cmd_puts("Can't move task to different control group\n"); 571ae28d1aaSFenghua Yu return -EINVAL; 572fa7d9493SBabu Moger } 573fa7d9493SBabu Moger } 574ae28d1aaSFenghua Yu 575ae28d1aaSFenghua Yu /* 576ae28d1aaSFenghua Yu * Ensure the task's closid and rmid are written before determining if 577ae28d1aaSFenghua Yu * the task is current that will decide if it will be interrupted. 578fe1f0714SPeter Newman * This pairs with the full barrier between the rq->curr update and 579fe1f0714SPeter Newman * resctrl_sched_in() during context switch. 580ae28d1aaSFenghua Yu */ 581fe1f0714SPeter Newman smp_mb(); 582ae28d1aaSFenghua Yu 583ae28d1aaSFenghua Yu /* 584ae28d1aaSFenghua Yu * By now, the task's closid and rmid are set. If the task is current 585ae28d1aaSFenghua Yu * on a CPU, the PQR_ASSOC MSR needs to be updated to make the resource 586ae28d1aaSFenghua Yu * group go into effect. If the task is not current, the MSR will be 587ae28d1aaSFenghua Yu * updated when the task is scheduled in. 588ae28d1aaSFenghua Yu */ 589ae28d1aaSFenghua Yu update_task_closid_rmid(tsk); 590ae28d1aaSFenghua Yu 591ae28d1aaSFenghua Yu return 0; 592fa7d9493SBabu Moger } 593fa7d9493SBabu Moger 594e6b2fac3SJames Morse static bool is_closid_match(struct task_struct *t, struct rdtgroup *r) 595e6b2fac3SJames Morse { 596e6b2fac3SJames Morse return (rdt_alloc_capable && 597e6b2fac3SJames Morse (r->type == RDTCTRL_GROUP) && (t->closid == r->closid)); 598e6b2fac3SJames Morse } 599e6b2fac3SJames Morse 600e6b2fac3SJames Morse static bool is_rmid_match(struct task_struct *t, struct rdtgroup *r) 601e6b2fac3SJames Morse { 602e6b2fac3SJames Morse return (rdt_mon_capable && 603e6b2fac3SJames Morse (r->type == RDTMON_GROUP) && (t->rmid == r->mon.rmid)); 604e6b2fac3SJames Morse } 605e6b2fac3SJames Morse 606fa7d9493SBabu Moger /** 607fa7d9493SBabu Moger * rdtgroup_tasks_assigned - Test if tasks have been assigned to resource group 608fa7d9493SBabu Moger * @r: Resource group 609fa7d9493SBabu Moger * 610fa7d9493SBabu Moger * Return: 1 if tasks have been assigned to @r, 0 otherwise 611fa7d9493SBabu Moger */ 612fa7d9493SBabu Moger int rdtgroup_tasks_assigned(struct rdtgroup *r) 613fa7d9493SBabu Moger { 614fa7d9493SBabu Moger struct task_struct *p, *t; 615fa7d9493SBabu Moger int ret = 0; 616fa7d9493SBabu Moger 617fa7d9493SBabu Moger lockdep_assert_held(&rdtgroup_mutex); 618fa7d9493SBabu Moger 619fa7d9493SBabu Moger rcu_read_lock(); 620fa7d9493SBabu Moger for_each_process_thread(p, t) { 621e6b2fac3SJames Morse if (is_closid_match(t, r) || is_rmid_match(t, r)) { 622fa7d9493SBabu Moger ret = 1; 623fa7d9493SBabu Moger break; 624fa7d9493SBabu Moger } 625fa7d9493SBabu Moger } 626fa7d9493SBabu Moger rcu_read_unlock(); 627fa7d9493SBabu Moger 628fa7d9493SBabu Moger return ret; 629fa7d9493SBabu Moger } 630fa7d9493SBabu Moger 631fa7d9493SBabu Moger static int rdtgroup_task_write_permission(struct task_struct *task, 632fa7d9493SBabu Moger struct kernfs_open_file *of) 633fa7d9493SBabu Moger { 634fa7d9493SBabu Moger const struct cred *tcred = get_task_cred(task); 635fa7d9493SBabu Moger const struct cred *cred = current_cred(); 636fa7d9493SBabu Moger int ret = 0; 637fa7d9493SBabu Moger 638fa7d9493SBabu Moger /* 639fa7d9493SBabu Moger * Even if we're attaching all tasks in the thread group, we only 640fa7d9493SBabu Moger * need to check permissions on one of them. 641fa7d9493SBabu Moger */ 642fa7d9493SBabu Moger if (!uid_eq(cred->euid, GLOBAL_ROOT_UID) && 643fa7d9493SBabu Moger !uid_eq(cred->euid, tcred->uid) && 644fa7d9493SBabu Moger !uid_eq(cred->euid, tcred->suid)) { 645fa7d9493SBabu Moger rdt_last_cmd_printf("No permission to move task %d\n", task->pid); 646fa7d9493SBabu Moger ret = -EPERM; 647fa7d9493SBabu Moger } 648fa7d9493SBabu Moger 649fa7d9493SBabu Moger put_cred(tcred); 650fa7d9493SBabu Moger return ret; 651fa7d9493SBabu Moger } 652fa7d9493SBabu Moger 653fa7d9493SBabu Moger static int rdtgroup_move_task(pid_t pid, struct rdtgroup *rdtgrp, 654fa7d9493SBabu Moger struct kernfs_open_file *of) 655fa7d9493SBabu Moger { 656fa7d9493SBabu Moger struct task_struct *tsk; 657fa7d9493SBabu Moger int ret; 658fa7d9493SBabu Moger 659fa7d9493SBabu Moger rcu_read_lock(); 660fa7d9493SBabu Moger if (pid) { 661fa7d9493SBabu Moger tsk = find_task_by_vpid(pid); 662fa7d9493SBabu Moger if (!tsk) { 663fa7d9493SBabu Moger rcu_read_unlock(); 664fa7d9493SBabu Moger rdt_last_cmd_printf("No task %d\n", pid); 665fa7d9493SBabu Moger return -ESRCH; 666fa7d9493SBabu Moger } 667fa7d9493SBabu Moger } else { 668fa7d9493SBabu Moger tsk = current; 669fa7d9493SBabu Moger } 670fa7d9493SBabu Moger 671fa7d9493SBabu Moger get_task_struct(tsk); 672fa7d9493SBabu Moger rcu_read_unlock(); 673fa7d9493SBabu Moger 674fa7d9493SBabu Moger ret = rdtgroup_task_write_permission(tsk, of); 675fa7d9493SBabu Moger if (!ret) 676fa7d9493SBabu Moger ret = __rdtgroup_move_task(tsk, rdtgrp); 677fa7d9493SBabu Moger 678fa7d9493SBabu Moger put_task_struct(tsk); 679fa7d9493SBabu Moger return ret; 680fa7d9493SBabu Moger } 681fa7d9493SBabu Moger 682fa7d9493SBabu Moger static ssize_t rdtgroup_tasks_write(struct kernfs_open_file *of, 683fa7d9493SBabu Moger char *buf, size_t nbytes, loff_t off) 684fa7d9493SBabu Moger { 685fa7d9493SBabu Moger struct rdtgroup *rdtgrp; 686fa7d9493SBabu Moger int ret = 0; 687fa7d9493SBabu Moger pid_t pid; 688fa7d9493SBabu Moger 689fa7d9493SBabu Moger if (kstrtoint(strstrip(buf), 0, &pid) || pid < 0) 690fa7d9493SBabu Moger return -EINVAL; 691fa7d9493SBabu Moger rdtgrp = rdtgroup_kn_lock_live(of->kn); 692fa7d9493SBabu Moger if (!rdtgrp) { 693fa7d9493SBabu Moger rdtgroup_kn_unlock(of->kn); 694fa7d9493SBabu Moger return -ENOENT; 695fa7d9493SBabu Moger } 696fa7d9493SBabu Moger rdt_last_cmd_clear(); 697fa7d9493SBabu Moger 698fa7d9493SBabu Moger if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED || 699fa7d9493SBabu Moger rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) { 700fa7d9493SBabu Moger ret = -EINVAL; 701723f1a0dSBabu Moger rdt_last_cmd_puts("Pseudo-locking in progress\n"); 702fa7d9493SBabu Moger goto unlock; 703fa7d9493SBabu Moger } 704fa7d9493SBabu Moger 705fa7d9493SBabu Moger ret = rdtgroup_move_task(pid, rdtgrp, of); 706fa7d9493SBabu Moger 707fa7d9493SBabu Moger unlock: 708fa7d9493SBabu Moger rdtgroup_kn_unlock(of->kn); 709fa7d9493SBabu Moger 710fa7d9493SBabu Moger return ret ?: nbytes; 711fa7d9493SBabu Moger } 712fa7d9493SBabu Moger 713fa7d9493SBabu Moger static void show_rdt_tasks(struct rdtgroup *r, struct seq_file *s) 714fa7d9493SBabu Moger { 715fa7d9493SBabu Moger struct task_struct *p, *t; 716fa7d9493SBabu Moger 717fa7d9493SBabu Moger rcu_read_lock(); 718fa7d9493SBabu Moger for_each_process_thread(p, t) { 719e6b2fac3SJames Morse if (is_closid_match(t, r) || is_rmid_match(t, r)) 720fa7d9493SBabu Moger seq_printf(s, "%d\n", t->pid); 721fa7d9493SBabu Moger } 722fa7d9493SBabu Moger rcu_read_unlock(); 723fa7d9493SBabu Moger } 724fa7d9493SBabu Moger 725fa7d9493SBabu Moger static int rdtgroup_tasks_show(struct kernfs_open_file *of, 726fa7d9493SBabu Moger struct seq_file *s, void *v) 727fa7d9493SBabu Moger { 728fa7d9493SBabu Moger struct rdtgroup *rdtgrp; 729fa7d9493SBabu Moger int ret = 0; 730fa7d9493SBabu Moger 731fa7d9493SBabu Moger rdtgrp = rdtgroup_kn_lock_live(of->kn); 732fa7d9493SBabu Moger if (rdtgrp) 733fa7d9493SBabu Moger show_rdt_tasks(rdtgrp, s); 734fa7d9493SBabu Moger else 735fa7d9493SBabu Moger ret = -ENOENT; 736fa7d9493SBabu Moger rdtgroup_kn_unlock(of->kn); 737fa7d9493SBabu Moger 738fa7d9493SBabu Moger return ret; 739fa7d9493SBabu Moger } 740fa7d9493SBabu Moger 741e79f15a4SChen Yu #ifdef CONFIG_PROC_CPU_RESCTRL 742e79f15a4SChen Yu 743e79f15a4SChen Yu /* 744e79f15a4SChen Yu * A task can only be part of one resctrl control group and of one monitor 745e79f15a4SChen Yu * group which is associated to that control group. 746e79f15a4SChen Yu * 747e79f15a4SChen Yu * 1) res: 748e79f15a4SChen Yu * mon: 749e79f15a4SChen Yu * 750e79f15a4SChen Yu * resctrl is not available. 751e79f15a4SChen Yu * 752e79f15a4SChen Yu * 2) res:/ 753e79f15a4SChen Yu * mon: 754e79f15a4SChen Yu * 755e79f15a4SChen Yu * Task is part of the root resctrl control group, and it is not associated 756e79f15a4SChen Yu * to any monitor group. 757e79f15a4SChen Yu * 758e79f15a4SChen Yu * 3) res:/ 759e79f15a4SChen Yu * mon:mon0 760e79f15a4SChen Yu * 761e79f15a4SChen Yu * Task is part of the root resctrl control group and monitor group mon0. 762e79f15a4SChen Yu * 763e79f15a4SChen Yu * 4) res:group0 764e79f15a4SChen Yu * mon: 765e79f15a4SChen Yu * 766e79f15a4SChen Yu * Task is part of resctrl control group group0, and it is not associated 767e79f15a4SChen Yu * to any monitor group. 768e79f15a4SChen Yu * 769e79f15a4SChen Yu * 5) res:group0 770e79f15a4SChen Yu * mon:mon1 771e79f15a4SChen Yu * 772e79f15a4SChen Yu * Task is part of resctrl control group group0 and monitor group mon1. 773e79f15a4SChen Yu */ 774e79f15a4SChen Yu int proc_resctrl_show(struct seq_file *s, struct pid_namespace *ns, 775e79f15a4SChen Yu struct pid *pid, struct task_struct *tsk) 776e79f15a4SChen Yu { 777e79f15a4SChen Yu struct rdtgroup *rdtg; 778e79f15a4SChen Yu int ret = 0; 779e79f15a4SChen Yu 780e79f15a4SChen Yu mutex_lock(&rdtgroup_mutex); 781e79f15a4SChen Yu 782e79f15a4SChen Yu /* Return empty if resctrl has not been mounted. */ 783e79f15a4SChen Yu if (!static_branch_unlikely(&rdt_enable_key)) { 784e79f15a4SChen Yu seq_puts(s, "res:\nmon:\n"); 785e79f15a4SChen Yu goto unlock; 786e79f15a4SChen Yu } 787e79f15a4SChen Yu 788e79f15a4SChen Yu list_for_each_entry(rdtg, &rdt_all_groups, rdtgroup_list) { 789e79f15a4SChen Yu struct rdtgroup *crg; 790e79f15a4SChen Yu 791e79f15a4SChen Yu /* 792e79f15a4SChen Yu * Task information is only relevant for shareable 793e79f15a4SChen Yu * and exclusive groups. 794e79f15a4SChen Yu */ 795e79f15a4SChen Yu if (rdtg->mode != RDT_MODE_SHAREABLE && 796e79f15a4SChen Yu rdtg->mode != RDT_MODE_EXCLUSIVE) 797e79f15a4SChen Yu continue; 798e79f15a4SChen Yu 799e79f15a4SChen Yu if (rdtg->closid != tsk->closid) 800e79f15a4SChen Yu continue; 801e79f15a4SChen Yu 802e79f15a4SChen Yu seq_printf(s, "res:%s%s\n", (rdtg == &rdtgroup_default) ? "/" : "", 803e79f15a4SChen Yu rdtg->kn->name); 804e79f15a4SChen Yu seq_puts(s, "mon:"); 805e79f15a4SChen Yu list_for_each_entry(crg, &rdtg->mon.crdtgrp_list, 806e79f15a4SChen Yu mon.crdtgrp_list) { 807e79f15a4SChen Yu if (tsk->rmid != crg->mon.rmid) 808e79f15a4SChen Yu continue; 809e79f15a4SChen Yu seq_printf(s, "%s", crg->kn->name); 810e79f15a4SChen Yu break; 811e79f15a4SChen Yu } 812e79f15a4SChen Yu seq_putc(s, '\n'); 813e79f15a4SChen Yu goto unlock; 814e79f15a4SChen Yu } 815e79f15a4SChen Yu /* 816e79f15a4SChen Yu * The above search should succeed. Otherwise return 817e79f15a4SChen Yu * with an error. 818e79f15a4SChen Yu */ 819e79f15a4SChen Yu ret = -ENOENT; 820e79f15a4SChen Yu unlock: 821e79f15a4SChen Yu mutex_unlock(&rdtgroup_mutex); 822e79f15a4SChen Yu 823e79f15a4SChen Yu return ret; 824e79f15a4SChen Yu } 825e79f15a4SChen Yu #endif 826e79f15a4SChen Yu 827fa7d9493SBabu Moger static int rdt_last_cmd_status_show(struct kernfs_open_file *of, 828fa7d9493SBabu Moger struct seq_file *seq, void *v) 829fa7d9493SBabu Moger { 830fa7d9493SBabu Moger int len; 831fa7d9493SBabu Moger 832fa7d9493SBabu Moger mutex_lock(&rdtgroup_mutex); 833fa7d9493SBabu Moger len = seq_buf_used(&last_cmd_status); 834fa7d9493SBabu Moger if (len) 835fa7d9493SBabu Moger seq_printf(seq, "%.*s", len, last_cmd_status_buf); 836fa7d9493SBabu Moger else 837fa7d9493SBabu Moger seq_puts(seq, "ok\n"); 838fa7d9493SBabu Moger mutex_unlock(&rdtgroup_mutex); 839fa7d9493SBabu Moger return 0; 840fa7d9493SBabu Moger } 841fa7d9493SBabu Moger 842fa7d9493SBabu Moger static int rdt_num_closids_show(struct kernfs_open_file *of, 843fa7d9493SBabu Moger struct seq_file *seq, void *v) 844fa7d9493SBabu Moger { 845f2594492SJames Morse struct resctrl_schema *s = of->kn->parent->priv; 846fa7d9493SBabu Moger 8473183e87cSJames Morse seq_printf(seq, "%u\n", s->num_closid); 848fa7d9493SBabu Moger return 0; 849fa7d9493SBabu Moger } 850fa7d9493SBabu Moger 851fa7d9493SBabu Moger static int rdt_default_ctrl_show(struct kernfs_open_file *of, 852fa7d9493SBabu Moger struct seq_file *seq, void *v) 853fa7d9493SBabu Moger { 854f2594492SJames Morse struct resctrl_schema *s = of->kn->parent->priv; 855f2594492SJames Morse struct rdt_resource *r = s->res; 856fa7d9493SBabu Moger 857fa7d9493SBabu Moger seq_printf(seq, "%x\n", r->default_ctrl); 858fa7d9493SBabu Moger return 0; 859fa7d9493SBabu Moger } 860fa7d9493SBabu Moger 861fa7d9493SBabu Moger static int rdt_min_cbm_bits_show(struct kernfs_open_file *of, 862fa7d9493SBabu Moger struct seq_file *seq, void *v) 863fa7d9493SBabu Moger { 864f2594492SJames Morse struct resctrl_schema *s = of->kn->parent->priv; 865f2594492SJames Morse struct rdt_resource *r = s->res; 866fa7d9493SBabu Moger 867fa7d9493SBabu Moger seq_printf(seq, "%u\n", r->cache.min_cbm_bits); 868fa7d9493SBabu Moger return 0; 869fa7d9493SBabu Moger } 870fa7d9493SBabu Moger 871fa7d9493SBabu Moger static int rdt_shareable_bits_show(struct kernfs_open_file *of, 872fa7d9493SBabu Moger struct seq_file *seq, void *v) 873fa7d9493SBabu Moger { 874f2594492SJames Morse struct resctrl_schema *s = of->kn->parent->priv; 875f2594492SJames Morse struct rdt_resource *r = s->res; 876fa7d9493SBabu Moger 877fa7d9493SBabu Moger seq_printf(seq, "%x\n", r->cache.shareable_bits); 878fa7d9493SBabu Moger return 0; 879fa7d9493SBabu Moger } 880fa7d9493SBabu Moger 881fa7d9493SBabu Moger /** 882fa7d9493SBabu Moger * rdt_bit_usage_show - Display current usage of resources 883fa7d9493SBabu Moger * 884fa7d9493SBabu Moger * A domain is a shared resource that can now be allocated differently. Here 885fa7d9493SBabu Moger * we display the current regions of the domain as an annotated bitmask. 886fa7d9493SBabu Moger * For each domain of this resource its allocation bitmask 887fa7d9493SBabu Moger * is annotated as below to indicate the current usage of the corresponding bit: 888fa7d9493SBabu Moger * 0 - currently unused 889fa7d9493SBabu Moger * X - currently available for sharing and used by software and hardware 890fa7d9493SBabu Moger * H - currently used by hardware only but available for software use 891fa7d9493SBabu Moger * S - currently used and shareable by software only 892fa7d9493SBabu Moger * E - currently used exclusively by one resource group 893fa7d9493SBabu Moger * P - currently pseudo-locked by one resource group 894fa7d9493SBabu Moger */ 895fa7d9493SBabu Moger static int rdt_bit_usage_show(struct kernfs_open_file *of, 896fa7d9493SBabu Moger struct seq_file *seq, void *v) 897fa7d9493SBabu Moger { 898f2594492SJames Morse struct resctrl_schema *s = of->kn->parent->priv; 89932f010deSReinette Chatre /* 90032f010deSReinette Chatre * Use unsigned long even though only 32 bits are used to ensure 90132f010deSReinette Chatre * test_bit() is used safely. 90232f010deSReinette Chatre */ 90332f010deSReinette Chatre unsigned long sw_shareable = 0, hw_shareable = 0; 90432f010deSReinette Chatre unsigned long exclusive = 0, pseudo_locked = 0; 905f2594492SJames Morse struct rdt_resource *r = s->res; 906fa7d9493SBabu Moger struct rdt_domain *dom; 907fa7d9493SBabu Moger int i, hwb, swb, excl, psl; 908fa7d9493SBabu Moger enum rdtgrp_mode mode; 909fa7d9493SBabu Moger bool sep = false; 910f07e9d02SJames Morse u32 ctrl_val; 911fa7d9493SBabu Moger 912fa7d9493SBabu Moger mutex_lock(&rdtgroup_mutex); 913fa7d9493SBabu Moger hw_shareable = r->cache.shareable_bits; 914fa7d9493SBabu Moger list_for_each_entry(dom, &r->domains, list) { 915fa7d9493SBabu Moger if (sep) 916fa7d9493SBabu Moger seq_putc(seq, ';'); 917fa7d9493SBabu Moger sw_shareable = 0; 918fa7d9493SBabu Moger exclusive = 0; 919fa7d9493SBabu Moger seq_printf(seq, "%d=", dom->id); 920f07e9d02SJames Morse for (i = 0; i < closids_supported(); i++) { 921fa7d9493SBabu Moger if (!closid_allocated(i)) 922fa7d9493SBabu Moger continue; 923111136e6SJames Morse ctrl_val = resctrl_arch_get_config(r, dom, i, 924111136e6SJames Morse s->conf_type); 925fa7d9493SBabu Moger mode = rdtgroup_mode_by_closid(i); 926fa7d9493SBabu Moger switch (mode) { 927fa7d9493SBabu Moger case RDT_MODE_SHAREABLE: 928f07e9d02SJames Morse sw_shareable |= ctrl_val; 929fa7d9493SBabu Moger break; 930fa7d9493SBabu Moger case RDT_MODE_EXCLUSIVE: 931f07e9d02SJames Morse exclusive |= ctrl_val; 932fa7d9493SBabu Moger break; 933fa7d9493SBabu Moger case RDT_MODE_PSEUDO_LOCKSETUP: 934fa7d9493SBabu Moger /* 935fa7d9493SBabu Moger * RDT_MODE_PSEUDO_LOCKSETUP is possible 936fa7d9493SBabu Moger * here but not included since the CBM 937fa7d9493SBabu Moger * associated with this CLOSID in this mode 938fa7d9493SBabu Moger * is not initialized and no task or cpu can be 939fa7d9493SBabu Moger * assigned this CLOSID. 940fa7d9493SBabu Moger */ 941fa7d9493SBabu Moger break; 942fa7d9493SBabu Moger case RDT_MODE_PSEUDO_LOCKED: 943fa7d9493SBabu Moger case RDT_NUM_MODES: 944fa7d9493SBabu Moger WARN(1, 945fa7d9493SBabu Moger "invalid mode for closid %d\n", i); 946fa7d9493SBabu Moger break; 947fa7d9493SBabu Moger } 948fa7d9493SBabu Moger } 949fa7d9493SBabu Moger for (i = r->cache.cbm_len - 1; i >= 0; i--) { 950fa7d9493SBabu Moger pseudo_locked = dom->plr ? dom->plr->cbm : 0; 95132f010deSReinette Chatre hwb = test_bit(i, &hw_shareable); 95232f010deSReinette Chatre swb = test_bit(i, &sw_shareable); 95332f010deSReinette Chatre excl = test_bit(i, &exclusive); 95432f010deSReinette Chatre psl = test_bit(i, &pseudo_locked); 955fa7d9493SBabu Moger if (hwb && swb) 956fa7d9493SBabu Moger seq_putc(seq, 'X'); 957fa7d9493SBabu Moger else if (hwb && !swb) 958fa7d9493SBabu Moger seq_putc(seq, 'H'); 959fa7d9493SBabu Moger else if (!hwb && swb) 960fa7d9493SBabu Moger seq_putc(seq, 'S'); 961fa7d9493SBabu Moger else if (excl) 962fa7d9493SBabu Moger seq_putc(seq, 'E'); 963fa7d9493SBabu Moger else if (psl) 964fa7d9493SBabu Moger seq_putc(seq, 'P'); 965fa7d9493SBabu Moger else /* Unused bits remain */ 966fa7d9493SBabu Moger seq_putc(seq, '0'); 967fa7d9493SBabu Moger } 968fa7d9493SBabu Moger sep = true; 969fa7d9493SBabu Moger } 970fa7d9493SBabu Moger seq_putc(seq, '\n'); 971fa7d9493SBabu Moger mutex_unlock(&rdtgroup_mutex); 972fa7d9493SBabu Moger return 0; 973fa7d9493SBabu Moger } 974fa7d9493SBabu Moger 975fa7d9493SBabu Moger static int rdt_min_bw_show(struct kernfs_open_file *of, 976fa7d9493SBabu Moger struct seq_file *seq, void *v) 977fa7d9493SBabu Moger { 978f2594492SJames Morse struct resctrl_schema *s = of->kn->parent->priv; 979f2594492SJames Morse struct rdt_resource *r = s->res; 980fa7d9493SBabu Moger 981fa7d9493SBabu Moger seq_printf(seq, "%u\n", r->membw.min_bw); 982fa7d9493SBabu Moger return 0; 983fa7d9493SBabu Moger } 984fa7d9493SBabu Moger 985fa7d9493SBabu Moger static int rdt_num_rmids_show(struct kernfs_open_file *of, 986fa7d9493SBabu Moger struct seq_file *seq, void *v) 987fa7d9493SBabu Moger { 988fa7d9493SBabu Moger struct rdt_resource *r = of->kn->parent->priv; 989fa7d9493SBabu Moger 990fa7d9493SBabu Moger seq_printf(seq, "%d\n", r->num_rmid); 991fa7d9493SBabu Moger 992fa7d9493SBabu Moger return 0; 993fa7d9493SBabu Moger } 994fa7d9493SBabu Moger 995fa7d9493SBabu Moger static int rdt_mon_features_show(struct kernfs_open_file *of, 996fa7d9493SBabu Moger struct seq_file *seq, void *v) 997fa7d9493SBabu Moger { 998fa7d9493SBabu Moger struct rdt_resource *r = of->kn->parent->priv; 999fa7d9493SBabu Moger struct mon_evt *mevt; 1000fa7d9493SBabu Moger 1001d507f83cSBabu Moger list_for_each_entry(mevt, &r->evt_list, list) { 1002fa7d9493SBabu Moger seq_printf(seq, "%s\n", mevt->name); 1003d507f83cSBabu Moger if (mevt->configurable) 1004d507f83cSBabu Moger seq_printf(seq, "%s_config\n", mevt->name); 1005d507f83cSBabu Moger } 1006fa7d9493SBabu Moger 1007fa7d9493SBabu Moger return 0; 1008fa7d9493SBabu Moger } 1009fa7d9493SBabu Moger 1010fa7d9493SBabu Moger static int rdt_bw_gran_show(struct kernfs_open_file *of, 1011fa7d9493SBabu Moger struct seq_file *seq, void *v) 1012fa7d9493SBabu Moger { 1013f2594492SJames Morse struct resctrl_schema *s = of->kn->parent->priv; 1014f2594492SJames Morse struct rdt_resource *r = s->res; 1015fa7d9493SBabu Moger 1016fa7d9493SBabu Moger seq_printf(seq, "%u\n", r->membw.bw_gran); 1017fa7d9493SBabu Moger return 0; 1018fa7d9493SBabu Moger } 1019fa7d9493SBabu Moger 1020fa7d9493SBabu Moger static int rdt_delay_linear_show(struct kernfs_open_file *of, 1021fa7d9493SBabu Moger struct seq_file *seq, void *v) 1022fa7d9493SBabu Moger { 1023f2594492SJames Morse struct resctrl_schema *s = of->kn->parent->priv; 1024f2594492SJames Morse struct rdt_resource *r = s->res; 1025fa7d9493SBabu Moger 1026fa7d9493SBabu Moger seq_printf(seq, "%u\n", r->membw.delay_linear); 1027fa7d9493SBabu Moger return 0; 1028fa7d9493SBabu Moger } 1029fa7d9493SBabu Moger 1030fa7d9493SBabu Moger static int max_threshold_occ_show(struct kernfs_open_file *of, 1031fa7d9493SBabu Moger struct seq_file *seq, void *v) 1032fa7d9493SBabu Moger { 1033ae2328b5SJames Morse seq_printf(seq, "%u\n", resctrl_rmid_realloc_threshold); 1034fa7d9493SBabu Moger 1035fa7d9493SBabu Moger return 0; 1036fa7d9493SBabu Moger } 1037fa7d9493SBabu Moger 103829b6bd41SFenghua Yu static int rdt_thread_throttle_mode_show(struct kernfs_open_file *of, 103929b6bd41SFenghua Yu struct seq_file *seq, void *v) 104029b6bd41SFenghua Yu { 1041f2594492SJames Morse struct resctrl_schema *s = of->kn->parent->priv; 1042f2594492SJames Morse struct rdt_resource *r = s->res; 104329b6bd41SFenghua Yu 104429b6bd41SFenghua Yu if (r->membw.throttle_mode == THREAD_THROTTLE_PER_THREAD) 104529b6bd41SFenghua Yu seq_puts(seq, "per-thread\n"); 104629b6bd41SFenghua Yu else 104729b6bd41SFenghua Yu seq_puts(seq, "max\n"); 104829b6bd41SFenghua Yu 104929b6bd41SFenghua Yu return 0; 105029b6bd41SFenghua Yu } 105129b6bd41SFenghua Yu 1052fa7d9493SBabu Moger static ssize_t max_threshold_occ_write(struct kernfs_open_file *of, 1053fa7d9493SBabu Moger char *buf, size_t nbytes, loff_t off) 1054fa7d9493SBabu Moger { 1055fa7d9493SBabu Moger unsigned int bytes; 1056fa7d9493SBabu Moger int ret; 1057fa7d9493SBabu Moger 1058fa7d9493SBabu Moger ret = kstrtouint(buf, 0, &bytes); 1059fa7d9493SBabu Moger if (ret) 1060fa7d9493SBabu Moger return ret; 1061fa7d9493SBabu Moger 1062d80975e2SJames Morse if (bytes > resctrl_rmid_realloc_limit) 1063fa7d9493SBabu Moger return -EINVAL; 1064fa7d9493SBabu Moger 1065ae2328b5SJames Morse resctrl_rmid_realloc_threshold = resctrl_arch_round_mon_val(bytes); 1066fa7d9493SBabu Moger 1067fa7d9493SBabu Moger return nbytes; 1068fa7d9493SBabu Moger } 1069fa7d9493SBabu Moger 1070fa7d9493SBabu Moger /* 1071fa7d9493SBabu Moger * rdtgroup_mode_show - Display mode of this resource group 1072fa7d9493SBabu Moger */ 1073fa7d9493SBabu Moger static int rdtgroup_mode_show(struct kernfs_open_file *of, 1074fa7d9493SBabu Moger struct seq_file *s, void *v) 1075fa7d9493SBabu Moger { 1076fa7d9493SBabu Moger struct rdtgroup *rdtgrp; 1077fa7d9493SBabu Moger 1078fa7d9493SBabu Moger rdtgrp = rdtgroup_kn_lock_live(of->kn); 1079fa7d9493SBabu Moger if (!rdtgrp) { 1080fa7d9493SBabu Moger rdtgroup_kn_unlock(of->kn); 1081fa7d9493SBabu Moger return -ENOENT; 1082fa7d9493SBabu Moger } 1083fa7d9493SBabu Moger 1084fa7d9493SBabu Moger seq_printf(s, "%s\n", rdtgroup_mode_str(rdtgrp->mode)); 1085fa7d9493SBabu Moger 1086fa7d9493SBabu Moger rdtgroup_kn_unlock(of->kn); 1087fa7d9493SBabu Moger return 0; 1088fa7d9493SBabu Moger } 1089fa7d9493SBabu Moger 1090fbc06c69SJames Morse static enum resctrl_conf_type resctrl_peer_type(enum resctrl_conf_type my_type) 1091fa7d9493SBabu Moger { 1092fbc06c69SJames Morse switch (my_type) { 1093fbc06c69SJames Morse case CDP_CODE: 1094fbc06c69SJames Morse return CDP_DATA; 1095fbc06c69SJames Morse case CDP_DATA: 1096fbc06c69SJames Morse return CDP_CODE; 1097fa7d9493SBabu Moger default: 1098fbc06c69SJames Morse case CDP_NONE: 1099fbc06c69SJames Morse return CDP_NONE; 1100fa7d9493SBabu Moger } 1101fa7d9493SBabu Moger } 1102fa7d9493SBabu Moger 1103fa7d9493SBabu Moger /** 1104fa7d9493SBabu Moger * __rdtgroup_cbm_overlaps - Does CBM for intended closid overlap with other 1105fa7d9493SBabu Moger * @r: Resource to which domain instance @d belongs. 1106fa7d9493SBabu Moger * @d: The domain instance for which @closid is being tested. 1107fa7d9493SBabu Moger * @cbm: Capacity bitmask being tested. 1108fa7d9493SBabu Moger * @closid: Intended closid for @cbm. 1109fa7d9493SBabu Moger * @exclusive: Only check if overlaps with exclusive resource groups 1110fa7d9493SBabu Moger * 1111fa7d9493SBabu Moger * Checks if provided @cbm intended to be used for @closid on domain 1112fa7d9493SBabu Moger * @d overlaps with any other closids or other hardware usage associated 1113fa7d9493SBabu Moger * with this domain. If @exclusive is true then only overlaps with 1114fa7d9493SBabu Moger * resource groups in exclusive mode will be considered. If @exclusive 1115fa7d9493SBabu Moger * is false then overlaps with any resource group or hardware entities 1116fa7d9493SBabu Moger * will be considered. 1117fa7d9493SBabu Moger * 1118fa7d9493SBabu Moger * @cbm is unsigned long, even if only 32 bits are used, to make the 1119fa7d9493SBabu Moger * bitmap functions work correctly. 1120fa7d9493SBabu Moger * 1121fa7d9493SBabu Moger * Return: false if CBM does not overlap, true if it does. 1122fa7d9493SBabu Moger */ 1123fa7d9493SBabu Moger static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d, 1124fa8f711dSJames Morse unsigned long cbm, int closid, 1125fa8f711dSJames Morse enum resctrl_conf_type type, bool exclusive) 1126fa7d9493SBabu Moger { 1127fa7d9493SBabu Moger enum rdtgrp_mode mode; 1128fa7d9493SBabu Moger unsigned long ctrl_b; 1129fa7d9493SBabu Moger int i; 1130fa7d9493SBabu Moger 1131fa7d9493SBabu Moger /* Check for any overlap with regions used by hardware directly */ 1132fa7d9493SBabu Moger if (!exclusive) { 1133fa7d9493SBabu Moger ctrl_b = r->cache.shareable_bits; 1134fa7d9493SBabu Moger if (bitmap_intersects(&cbm, &ctrl_b, r->cache.cbm_len)) 1135fa7d9493SBabu Moger return true; 1136fa7d9493SBabu Moger } 1137fa7d9493SBabu Moger 1138fa7d9493SBabu Moger /* Check for overlap with other resource groups */ 1139f07e9d02SJames Morse for (i = 0; i < closids_supported(); i++) { 1140111136e6SJames Morse ctrl_b = resctrl_arch_get_config(r, d, i, type); 1141fa7d9493SBabu Moger mode = rdtgroup_mode_by_closid(i); 1142fa7d9493SBabu Moger if (closid_allocated(i) && i != closid && 1143fa7d9493SBabu Moger mode != RDT_MODE_PSEUDO_LOCKSETUP) { 1144fa7d9493SBabu Moger if (bitmap_intersects(&cbm, &ctrl_b, r->cache.cbm_len)) { 1145fa7d9493SBabu Moger if (exclusive) { 1146fa7d9493SBabu Moger if (mode == RDT_MODE_EXCLUSIVE) 1147fa7d9493SBabu Moger return true; 1148fa7d9493SBabu Moger continue; 1149fa7d9493SBabu Moger } 1150fa7d9493SBabu Moger return true; 1151fa7d9493SBabu Moger } 1152fa7d9493SBabu Moger } 1153fa7d9493SBabu Moger } 1154fa7d9493SBabu Moger 1155fa7d9493SBabu Moger return false; 1156fa7d9493SBabu Moger } 1157fa7d9493SBabu Moger 1158fa7d9493SBabu Moger /** 1159fa7d9493SBabu Moger * rdtgroup_cbm_overlaps - Does CBM overlap with other use of hardware 11601c290682SJames Morse * @s: Schema for the resource to which domain instance @d belongs. 1161fa7d9493SBabu Moger * @d: The domain instance for which @closid is being tested. 1162fa7d9493SBabu Moger * @cbm: Capacity bitmask being tested. 1163fa7d9493SBabu Moger * @closid: Intended closid for @cbm. 1164fa7d9493SBabu Moger * @exclusive: Only check if overlaps with exclusive resource groups 1165fa7d9493SBabu Moger * 1166fa7d9493SBabu Moger * Resources that can be allocated using a CBM can use the CBM to control 1167fa7d9493SBabu Moger * the overlap of these allocations. rdtgroup_cmb_overlaps() is the test 1168fa7d9493SBabu Moger * for overlap. Overlap test is not limited to the specific resource for 1169fa7d9493SBabu Moger * which the CBM is intended though - when dealing with CDP resources that 1170fa7d9493SBabu Moger * share the underlying hardware the overlap check should be performed on 1171fa7d9493SBabu Moger * the CDP resource sharing the hardware also. 1172fa7d9493SBabu Moger * 1173fa7d9493SBabu Moger * Refer to description of __rdtgroup_cbm_overlaps() for the details of the 1174fa7d9493SBabu Moger * overlap test. 1175fa7d9493SBabu Moger * 1176fa7d9493SBabu Moger * Return: true if CBM overlap detected, false if there is no overlap 1177fa7d9493SBabu Moger */ 11781c290682SJames Morse bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_domain *d, 1179fa7d9493SBabu Moger unsigned long cbm, int closid, bool exclusive) 1180fa7d9493SBabu Moger { 1181fbc06c69SJames Morse enum resctrl_conf_type peer_type = resctrl_peer_type(s->conf_type); 11821c290682SJames Morse struct rdt_resource *r = s->res; 1183fa7d9493SBabu Moger 1184fa8f711dSJames Morse if (__rdtgroup_cbm_overlaps(r, d, cbm, closid, s->conf_type, 1185fa8f711dSJames Morse exclusive)) 1186fa7d9493SBabu Moger return true; 1187fa7d9493SBabu Moger 1188fbc06c69SJames Morse if (!resctrl_arch_get_cdp_enabled(r->rid)) 1189fa7d9493SBabu Moger return false; 1190fbc06c69SJames Morse return __rdtgroup_cbm_overlaps(r, d, cbm, closid, peer_type, exclusive); 1191fa7d9493SBabu Moger } 1192fa7d9493SBabu Moger 1193fa7d9493SBabu Moger /** 1194fa7d9493SBabu Moger * rdtgroup_mode_test_exclusive - Test if this resource group can be exclusive 1195fa7d9493SBabu Moger * 1196fa7d9493SBabu Moger * An exclusive resource group implies that there should be no sharing of 1197fa7d9493SBabu Moger * its allocated resources. At the time this group is considered to be 1198fa7d9493SBabu Moger * exclusive this test can determine if its current schemata supports this 1199fa7d9493SBabu Moger * setting by testing for overlap with all other resource groups. 1200fa7d9493SBabu Moger * 1201fa7d9493SBabu Moger * Return: true if resource group can be exclusive, false if there is overlap 1202fa7d9493SBabu Moger * with allocations of other resource groups and thus this resource group 1203fa7d9493SBabu Moger * cannot be exclusive. 1204fa7d9493SBabu Moger */ 1205fa7d9493SBabu Moger static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp) 1206fa7d9493SBabu Moger { 1207fa7d9493SBabu Moger int closid = rdtgrp->closid; 1208331ebe4cSJames Morse struct resctrl_schema *s; 1209fa7d9493SBabu Moger struct rdt_resource *r; 1210fa7d9493SBabu Moger bool has_cache = false; 1211fa7d9493SBabu Moger struct rdt_domain *d; 1212f07e9d02SJames Morse u32 ctrl; 1213fa7d9493SBabu Moger 1214331ebe4cSJames Morse list_for_each_entry(s, &resctrl_schema_all, list) { 1215331ebe4cSJames Morse r = s->res; 12165b6fac3fSBabu Moger if (r->rid == RDT_RESOURCE_MBA || r->rid == RDT_RESOURCE_SMBA) 1217fa7d9493SBabu Moger continue; 1218fa7d9493SBabu Moger has_cache = true; 1219fa7d9493SBabu Moger list_for_each_entry(d, &r->domains, list) { 1220111136e6SJames Morse ctrl = resctrl_arch_get_config(r, d, closid, 1221111136e6SJames Morse s->conf_type); 1222f07e9d02SJames Morse if (rdtgroup_cbm_overlaps(s, d, ctrl, closid, false)) { 1223723f1a0dSBabu Moger rdt_last_cmd_puts("Schemata overlaps\n"); 1224fa7d9493SBabu Moger return false; 1225fa7d9493SBabu Moger } 1226fa7d9493SBabu Moger } 1227fa7d9493SBabu Moger } 1228fa7d9493SBabu Moger 1229fa7d9493SBabu Moger if (!has_cache) { 1230723f1a0dSBabu Moger rdt_last_cmd_puts("Cannot be exclusive without CAT/CDP\n"); 1231fa7d9493SBabu Moger return false; 1232fa7d9493SBabu Moger } 1233fa7d9493SBabu Moger 1234fa7d9493SBabu Moger return true; 1235fa7d9493SBabu Moger } 1236fa7d9493SBabu Moger 1237fa7d9493SBabu Moger /** 1238fa7d9493SBabu Moger * rdtgroup_mode_write - Modify the resource group's mode 1239fa7d9493SBabu Moger * 1240fa7d9493SBabu Moger */ 1241fa7d9493SBabu Moger static ssize_t rdtgroup_mode_write(struct kernfs_open_file *of, 1242fa7d9493SBabu Moger char *buf, size_t nbytes, loff_t off) 1243fa7d9493SBabu Moger { 1244fa7d9493SBabu Moger struct rdtgroup *rdtgrp; 1245fa7d9493SBabu Moger enum rdtgrp_mode mode; 1246fa7d9493SBabu Moger int ret = 0; 1247fa7d9493SBabu Moger 1248fa7d9493SBabu Moger /* Valid input requires a trailing newline */ 1249fa7d9493SBabu Moger if (nbytes == 0 || buf[nbytes - 1] != '\n') 1250fa7d9493SBabu Moger return -EINVAL; 1251fa7d9493SBabu Moger buf[nbytes - 1] = '\0'; 1252fa7d9493SBabu Moger 1253fa7d9493SBabu Moger rdtgrp = rdtgroup_kn_lock_live(of->kn); 1254fa7d9493SBabu Moger if (!rdtgrp) { 1255fa7d9493SBabu Moger rdtgroup_kn_unlock(of->kn); 1256fa7d9493SBabu Moger return -ENOENT; 1257fa7d9493SBabu Moger } 1258fa7d9493SBabu Moger 1259fa7d9493SBabu Moger rdt_last_cmd_clear(); 1260fa7d9493SBabu Moger 1261fa7d9493SBabu Moger mode = rdtgrp->mode; 1262fa7d9493SBabu Moger 1263fa7d9493SBabu Moger if ((!strcmp(buf, "shareable") && mode == RDT_MODE_SHAREABLE) || 1264fa7d9493SBabu Moger (!strcmp(buf, "exclusive") && mode == RDT_MODE_EXCLUSIVE) || 1265fa7d9493SBabu Moger (!strcmp(buf, "pseudo-locksetup") && 1266fa7d9493SBabu Moger mode == RDT_MODE_PSEUDO_LOCKSETUP) || 1267fa7d9493SBabu Moger (!strcmp(buf, "pseudo-locked") && mode == RDT_MODE_PSEUDO_LOCKED)) 1268fa7d9493SBabu Moger goto out; 1269fa7d9493SBabu Moger 1270fa7d9493SBabu Moger if (mode == RDT_MODE_PSEUDO_LOCKED) { 127145682489SReinette Chatre rdt_last_cmd_puts("Cannot change pseudo-locked group\n"); 1272fa7d9493SBabu Moger ret = -EINVAL; 1273fa7d9493SBabu Moger goto out; 1274fa7d9493SBabu Moger } 1275fa7d9493SBabu Moger 1276fa7d9493SBabu Moger if (!strcmp(buf, "shareable")) { 1277fa7d9493SBabu Moger if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) { 1278fa7d9493SBabu Moger ret = rdtgroup_locksetup_exit(rdtgrp); 1279fa7d9493SBabu Moger if (ret) 1280fa7d9493SBabu Moger goto out; 1281fa7d9493SBabu Moger } 1282fa7d9493SBabu Moger rdtgrp->mode = RDT_MODE_SHAREABLE; 1283fa7d9493SBabu Moger } else if (!strcmp(buf, "exclusive")) { 1284fa7d9493SBabu Moger if (!rdtgroup_mode_test_exclusive(rdtgrp)) { 1285fa7d9493SBabu Moger ret = -EINVAL; 1286fa7d9493SBabu Moger goto out; 1287fa7d9493SBabu Moger } 1288fa7d9493SBabu Moger if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) { 1289fa7d9493SBabu Moger ret = rdtgroup_locksetup_exit(rdtgrp); 1290fa7d9493SBabu Moger if (ret) 1291fa7d9493SBabu Moger goto out; 1292fa7d9493SBabu Moger } 1293fa7d9493SBabu Moger rdtgrp->mode = RDT_MODE_EXCLUSIVE; 1294fa7d9493SBabu Moger } else if (!strcmp(buf, "pseudo-locksetup")) { 1295fa7d9493SBabu Moger ret = rdtgroup_locksetup_enter(rdtgrp); 1296fa7d9493SBabu Moger if (ret) 1297fa7d9493SBabu Moger goto out; 1298fa7d9493SBabu Moger rdtgrp->mode = RDT_MODE_PSEUDO_LOCKSETUP; 1299fa7d9493SBabu Moger } else { 130045682489SReinette Chatre rdt_last_cmd_puts("Unknown or unsupported mode\n"); 1301fa7d9493SBabu Moger ret = -EINVAL; 1302fa7d9493SBabu Moger } 1303fa7d9493SBabu Moger 1304fa7d9493SBabu Moger out: 1305fa7d9493SBabu Moger rdtgroup_kn_unlock(of->kn); 1306fa7d9493SBabu Moger return ret ?: nbytes; 1307fa7d9493SBabu Moger } 1308fa7d9493SBabu Moger 1309fa7d9493SBabu Moger /** 1310fa7d9493SBabu Moger * rdtgroup_cbm_to_size - Translate CBM to size in bytes 1311fa7d9493SBabu Moger * @r: RDT resource to which @d belongs. 1312fa7d9493SBabu Moger * @d: RDT domain instance. 1313fa7d9493SBabu Moger * @cbm: bitmask for which the size should be computed. 1314fa7d9493SBabu Moger * 1315fa7d9493SBabu Moger * The bitmask provided associated with the RDT domain instance @d will be 1316fa7d9493SBabu Moger * translated into how many bytes it represents. The size in bytes is 1317fa7d9493SBabu Moger * computed by first dividing the total cache size by the CBM length to 1318fa7d9493SBabu Moger * determine how many bytes each bit in the bitmask represents. The result 1319fa7d9493SBabu Moger * is multiplied with the number of bits set in the bitmask. 1320fa7d9493SBabu Moger * 1321fa7d9493SBabu Moger * @cbm is unsigned long, even if only 32 bits are used to make the 1322fa7d9493SBabu Moger * bitmap functions work correctly. 1323fa7d9493SBabu Moger */ 1324fa7d9493SBabu Moger unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, 1325fa7d9493SBabu Moger struct rdt_domain *d, unsigned long cbm) 1326fa7d9493SBabu Moger { 1327fa7d9493SBabu Moger struct cpu_cacheinfo *ci; 1328fa7d9493SBabu Moger unsigned int size = 0; 1329fa7d9493SBabu Moger int num_b, i; 1330fa7d9493SBabu Moger 1331fa7d9493SBabu Moger num_b = bitmap_weight(&cbm, r->cache.cbm_len); 1332fa7d9493SBabu Moger ci = get_cpu_cacheinfo(cpumask_any(&d->cpu_mask)); 1333fa7d9493SBabu Moger for (i = 0; i < ci->num_leaves; i++) { 1334fa7d9493SBabu Moger if (ci->info_list[i].level == r->cache_level) { 1335fa7d9493SBabu Moger size = ci->info_list[i].size / r->cache.cbm_len * num_b; 1336fa7d9493SBabu Moger break; 1337fa7d9493SBabu Moger } 1338fa7d9493SBabu Moger } 1339fa7d9493SBabu Moger 1340fa7d9493SBabu Moger return size; 1341fa7d9493SBabu Moger } 1342fa7d9493SBabu Moger 1343fa7d9493SBabu Moger /** 1344fa7d9493SBabu Moger * rdtgroup_size_show - Display size in bytes of allocated regions 1345fa7d9493SBabu Moger * 1346fa7d9493SBabu Moger * The "size" file mirrors the layout of the "schemata" file, printing the 1347fa7d9493SBabu Moger * size in bytes of each region instead of the capacity bitmask. 1348fa7d9493SBabu Moger * 1349fa7d9493SBabu Moger */ 1350fa7d9493SBabu Moger static int rdtgroup_size_show(struct kernfs_open_file *of, 1351fa7d9493SBabu Moger struct seq_file *s, void *v) 1352fa7d9493SBabu Moger { 1353331ebe4cSJames Morse struct resctrl_schema *schema; 13546ce1560dSJames Morse enum resctrl_conf_type type; 1355fa7d9493SBabu Moger struct rdtgroup *rdtgrp; 1356fa7d9493SBabu Moger struct rdt_resource *r; 1357fa7d9493SBabu Moger struct rdt_domain *d; 1358fa7d9493SBabu Moger unsigned int size; 1359fa7d9493SBabu Moger int ret = 0; 13606ce1560dSJames Morse u32 closid; 1361fa7d9493SBabu Moger bool sep; 1362fa7d9493SBabu Moger u32 ctrl; 1363fa7d9493SBabu Moger 1364fa7d9493SBabu Moger rdtgrp = rdtgroup_kn_lock_live(of->kn); 1365fa7d9493SBabu Moger if (!rdtgrp) { 1366fa7d9493SBabu Moger rdtgroup_kn_unlock(of->kn); 1367fa7d9493SBabu Moger return -ENOENT; 1368fa7d9493SBabu Moger } 1369fa7d9493SBabu Moger 1370fa7d9493SBabu Moger if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) { 1371fa7d9493SBabu Moger if (!rdtgrp->plr->d) { 1372fa7d9493SBabu Moger rdt_last_cmd_clear(); 1373fa7d9493SBabu Moger rdt_last_cmd_puts("Cache domain offline\n"); 1374fa7d9493SBabu Moger ret = -ENODEV; 1375fa7d9493SBabu Moger } else { 1376fa7d9493SBabu Moger seq_printf(s, "%*s:", max_name_width, 1377e198fde3SJames Morse rdtgrp->plr->s->name); 137832150eddSJames Morse size = rdtgroup_cbm_to_size(rdtgrp->plr->s->res, 1379fa7d9493SBabu Moger rdtgrp->plr->d, 1380fa7d9493SBabu Moger rdtgrp->plr->cbm); 1381fa7d9493SBabu Moger seq_printf(s, "%d=%u\n", rdtgrp->plr->d->id, size); 1382fa7d9493SBabu Moger } 1383fa7d9493SBabu Moger goto out; 1384fa7d9493SBabu Moger } 1385fa7d9493SBabu Moger 13866ce1560dSJames Morse closid = rdtgrp->closid; 13876ce1560dSJames Morse 1388331ebe4cSJames Morse list_for_each_entry(schema, &resctrl_schema_all, list) { 1389331ebe4cSJames Morse r = schema->res; 13906ce1560dSJames Morse type = schema->conf_type; 1391fa7d9493SBabu Moger sep = false; 1392e198fde3SJames Morse seq_printf(s, "%*s:", max_name_width, schema->name); 1393fa7d9493SBabu Moger list_for_each_entry(d, &r->domains, list) { 1394fa7d9493SBabu Moger if (sep) 1395fa7d9493SBabu Moger seq_putc(s, ';'); 1396fa7d9493SBabu Moger if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) { 1397fa7d9493SBabu Moger size = 0; 1398fa7d9493SBabu Moger } else { 13996ce1560dSJames Morse if (is_mba_sc(r)) 14006ce1560dSJames Morse ctrl = d->mbps_val[closid]; 14016ce1560dSJames Morse else 1402111136e6SJames Morse ctrl = resctrl_arch_get_config(r, d, 14036ce1560dSJames Morse closid, 14046ce1560dSJames Morse type); 14055b6fac3fSBabu Moger if (r->rid == RDT_RESOURCE_MBA || 14065b6fac3fSBabu Moger r->rid == RDT_RESOURCE_SMBA) 1407fa7d9493SBabu Moger size = ctrl; 1408fa7d9493SBabu Moger else 1409fa7d9493SBabu Moger size = rdtgroup_cbm_to_size(r, d, ctrl); 1410fa7d9493SBabu Moger } 1411fa7d9493SBabu Moger seq_printf(s, "%d=%u", d->id, size); 1412fa7d9493SBabu Moger sep = true; 1413fa7d9493SBabu Moger } 1414fa7d9493SBabu Moger seq_putc(s, '\n'); 1415fa7d9493SBabu Moger } 1416fa7d9493SBabu Moger 1417fa7d9493SBabu Moger out: 1418fa7d9493SBabu Moger rdtgroup_kn_unlock(of->kn); 1419fa7d9493SBabu Moger 1420fa7d9493SBabu Moger return ret; 1421fa7d9493SBabu Moger } 1422fa7d9493SBabu Moger 1423dc2a3e85SBabu Moger struct mon_config_info { 1424dc2a3e85SBabu Moger u32 evtid; 1425dc2a3e85SBabu Moger u32 mon_config; 1426dc2a3e85SBabu Moger }; 1427dc2a3e85SBabu Moger 1428dc2a3e85SBabu Moger #define INVALID_CONFIG_INDEX UINT_MAX 1429dc2a3e85SBabu Moger 1430dc2a3e85SBabu Moger /** 1431dc2a3e85SBabu Moger * mon_event_config_index_get - get the hardware index for the 1432dc2a3e85SBabu Moger * configurable event 1433dc2a3e85SBabu Moger * @evtid: event id. 1434dc2a3e85SBabu Moger * 1435dc2a3e85SBabu Moger * Return: 0 for evtid == QOS_L3_MBM_TOTAL_EVENT_ID 1436dc2a3e85SBabu Moger * 1 for evtid == QOS_L3_MBM_LOCAL_EVENT_ID 1437dc2a3e85SBabu Moger * INVALID_CONFIG_INDEX for invalid evtid 1438dc2a3e85SBabu Moger */ 1439dc2a3e85SBabu Moger static inline unsigned int mon_event_config_index_get(u32 evtid) 1440dc2a3e85SBabu Moger { 1441dc2a3e85SBabu Moger switch (evtid) { 1442dc2a3e85SBabu Moger case QOS_L3_MBM_TOTAL_EVENT_ID: 1443dc2a3e85SBabu Moger return 0; 1444dc2a3e85SBabu Moger case QOS_L3_MBM_LOCAL_EVENT_ID: 1445dc2a3e85SBabu Moger return 1; 1446dc2a3e85SBabu Moger default: 1447dc2a3e85SBabu Moger /* Should never reach here */ 1448dc2a3e85SBabu Moger return INVALID_CONFIG_INDEX; 1449dc2a3e85SBabu Moger } 1450dc2a3e85SBabu Moger } 1451dc2a3e85SBabu Moger 1452dc2a3e85SBabu Moger static void mon_event_config_read(void *info) 1453dc2a3e85SBabu Moger { 1454dc2a3e85SBabu Moger struct mon_config_info *mon_info = info; 1455dc2a3e85SBabu Moger unsigned int index; 1456dc2a3e85SBabu Moger u32 h; 1457dc2a3e85SBabu Moger 1458dc2a3e85SBabu Moger index = mon_event_config_index_get(mon_info->evtid); 1459dc2a3e85SBabu Moger if (index == INVALID_CONFIG_INDEX) { 1460dc2a3e85SBabu Moger pr_warn_once("Invalid event id %d\n", mon_info->evtid); 1461dc2a3e85SBabu Moger return; 1462dc2a3e85SBabu Moger } 1463dc2a3e85SBabu Moger rdmsr(MSR_IA32_EVT_CFG_BASE + index, mon_info->mon_config, h); 1464dc2a3e85SBabu Moger 1465dc2a3e85SBabu Moger /* Report only the valid event configuration bits */ 1466dc2a3e85SBabu Moger mon_info->mon_config &= MAX_EVT_CONFIG_BITS; 1467dc2a3e85SBabu Moger } 1468dc2a3e85SBabu Moger 1469dc2a3e85SBabu Moger static void mondata_config_read(struct rdt_domain *d, struct mon_config_info *mon_info) 1470dc2a3e85SBabu Moger { 1471dc2a3e85SBabu Moger smp_call_function_any(&d->cpu_mask, mon_event_config_read, mon_info, 1); 1472dc2a3e85SBabu Moger } 1473dc2a3e85SBabu Moger 1474dc2a3e85SBabu Moger static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid) 1475dc2a3e85SBabu Moger { 1476dc2a3e85SBabu Moger struct mon_config_info mon_info = {0}; 1477dc2a3e85SBabu Moger struct rdt_domain *dom; 1478dc2a3e85SBabu Moger bool sep = false; 1479dc2a3e85SBabu Moger 1480dc2a3e85SBabu Moger mutex_lock(&rdtgroup_mutex); 1481dc2a3e85SBabu Moger 1482dc2a3e85SBabu Moger list_for_each_entry(dom, &r->domains, list) { 1483dc2a3e85SBabu Moger if (sep) 1484dc2a3e85SBabu Moger seq_puts(s, ";"); 1485dc2a3e85SBabu Moger 1486dc2a3e85SBabu Moger memset(&mon_info, 0, sizeof(struct mon_config_info)); 1487dc2a3e85SBabu Moger mon_info.evtid = evtid; 1488dc2a3e85SBabu Moger mondata_config_read(dom, &mon_info); 1489dc2a3e85SBabu Moger 1490dc2a3e85SBabu Moger seq_printf(s, "%d=0x%02x", dom->id, mon_info.mon_config); 1491dc2a3e85SBabu Moger sep = true; 1492dc2a3e85SBabu Moger } 1493dc2a3e85SBabu Moger seq_puts(s, "\n"); 1494dc2a3e85SBabu Moger 1495dc2a3e85SBabu Moger mutex_unlock(&rdtgroup_mutex); 1496dc2a3e85SBabu Moger 1497dc2a3e85SBabu Moger return 0; 1498dc2a3e85SBabu Moger } 1499dc2a3e85SBabu Moger 1500dc2a3e85SBabu Moger static int mbm_total_bytes_config_show(struct kernfs_open_file *of, 1501dc2a3e85SBabu Moger struct seq_file *seq, void *v) 1502dc2a3e85SBabu Moger { 1503dc2a3e85SBabu Moger struct rdt_resource *r = of->kn->parent->priv; 1504dc2a3e85SBabu Moger 1505dc2a3e85SBabu Moger mbm_config_show(seq, r, QOS_L3_MBM_TOTAL_EVENT_ID); 1506dc2a3e85SBabu Moger 1507dc2a3e85SBabu Moger return 0; 1508dc2a3e85SBabu Moger } 1509dc2a3e85SBabu Moger 151073afb2d3SBabu Moger static int mbm_local_bytes_config_show(struct kernfs_open_file *of, 151173afb2d3SBabu Moger struct seq_file *seq, void *v) 151273afb2d3SBabu Moger { 151373afb2d3SBabu Moger struct rdt_resource *r = of->kn->parent->priv; 151473afb2d3SBabu Moger 151573afb2d3SBabu Moger mbm_config_show(seq, r, QOS_L3_MBM_LOCAL_EVENT_ID); 151673afb2d3SBabu Moger 151773afb2d3SBabu Moger return 0; 151873afb2d3SBabu Moger } 151973afb2d3SBabu Moger 1520*92bd5a13SBabu Moger static void mon_event_config_write(void *info) 1521*92bd5a13SBabu Moger { 1522*92bd5a13SBabu Moger struct mon_config_info *mon_info = info; 1523*92bd5a13SBabu Moger unsigned int index; 1524*92bd5a13SBabu Moger 1525*92bd5a13SBabu Moger index = mon_event_config_index_get(mon_info->evtid); 1526*92bd5a13SBabu Moger if (index == INVALID_CONFIG_INDEX) { 1527*92bd5a13SBabu Moger pr_warn_once("Invalid event id %d\n", mon_info->evtid); 1528*92bd5a13SBabu Moger return; 1529*92bd5a13SBabu Moger } 1530*92bd5a13SBabu Moger wrmsr(MSR_IA32_EVT_CFG_BASE + index, mon_info->mon_config, 0); 1531*92bd5a13SBabu Moger } 1532*92bd5a13SBabu Moger 1533*92bd5a13SBabu Moger static int mbm_config_write_domain(struct rdt_resource *r, 1534*92bd5a13SBabu Moger struct rdt_domain *d, u32 evtid, u32 val) 1535*92bd5a13SBabu Moger { 1536*92bd5a13SBabu Moger struct mon_config_info mon_info = {0}; 1537*92bd5a13SBabu Moger int ret = 0; 1538*92bd5a13SBabu Moger 1539*92bd5a13SBabu Moger /* mon_config cannot be more than the supported set of events */ 1540*92bd5a13SBabu Moger if (val > MAX_EVT_CONFIG_BITS) { 1541*92bd5a13SBabu Moger rdt_last_cmd_puts("Invalid event configuration\n"); 1542*92bd5a13SBabu Moger return -EINVAL; 1543*92bd5a13SBabu Moger } 1544*92bd5a13SBabu Moger 1545*92bd5a13SBabu Moger /* 1546*92bd5a13SBabu Moger * Read the current config value first. If both are the same then 1547*92bd5a13SBabu Moger * no need to write it again. 1548*92bd5a13SBabu Moger */ 1549*92bd5a13SBabu Moger mon_info.evtid = evtid; 1550*92bd5a13SBabu Moger mondata_config_read(d, &mon_info); 1551*92bd5a13SBabu Moger if (mon_info.mon_config == val) 1552*92bd5a13SBabu Moger goto out; 1553*92bd5a13SBabu Moger 1554*92bd5a13SBabu Moger mon_info.mon_config = val; 1555*92bd5a13SBabu Moger 1556*92bd5a13SBabu Moger /* 1557*92bd5a13SBabu Moger * Update MSR_IA32_EVT_CFG_BASE MSR on one of the CPUs in the 1558*92bd5a13SBabu Moger * domain. The MSRs offset from MSR MSR_IA32_EVT_CFG_BASE 1559*92bd5a13SBabu Moger * are scoped at the domain level. Writing any of these MSRs 1560*92bd5a13SBabu Moger * on one CPU is observed by all the CPUs in the domain. 1561*92bd5a13SBabu Moger */ 1562*92bd5a13SBabu Moger smp_call_function_any(&d->cpu_mask, mon_event_config_write, 1563*92bd5a13SBabu Moger &mon_info, 1); 1564*92bd5a13SBabu Moger 1565*92bd5a13SBabu Moger /* 1566*92bd5a13SBabu Moger * When an Event Configuration is changed, the bandwidth counters 1567*92bd5a13SBabu Moger * for all RMIDs and Events will be cleared by the hardware. The 1568*92bd5a13SBabu Moger * hardware also sets MSR_IA32_QM_CTR.Unavailable (bit 62) for 1569*92bd5a13SBabu Moger * every RMID on the next read to any event for every RMID. 1570*92bd5a13SBabu Moger * Subsequent reads will have MSR_IA32_QM_CTR.Unavailable (bit 62) 1571*92bd5a13SBabu Moger * cleared while it is tracked by the hardware. Clear the 1572*92bd5a13SBabu Moger * mbm_local and mbm_total counts for all the RMIDs. 1573*92bd5a13SBabu Moger */ 1574*92bd5a13SBabu Moger resctrl_arch_reset_rmid_all(r, d); 1575*92bd5a13SBabu Moger 1576*92bd5a13SBabu Moger out: 1577*92bd5a13SBabu Moger return ret; 1578*92bd5a13SBabu Moger } 1579*92bd5a13SBabu Moger 1580*92bd5a13SBabu Moger static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid) 1581*92bd5a13SBabu Moger { 1582*92bd5a13SBabu Moger char *dom_str = NULL, *id_str; 1583*92bd5a13SBabu Moger unsigned long dom_id, val; 1584*92bd5a13SBabu Moger struct rdt_domain *d; 1585*92bd5a13SBabu Moger int ret = 0; 1586*92bd5a13SBabu Moger 1587*92bd5a13SBabu Moger next: 1588*92bd5a13SBabu Moger if (!tok || tok[0] == '\0') 1589*92bd5a13SBabu Moger return 0; 1590*92bd5a13SBabu Moger 1591*92bd5a13SBabu Moger /* Start processing the strings for each domain */ 1592*92bd5a13SBabu Moger dom_str = strim(strsep(&tok, ";")); 1593*92bd5a13SBabu Moger id_str = strsep(&dom_str, "="); 1594*92bd5a13SBabu Moger 1595*92bd5a13SBabu Moger if (!id_str || kstrtoul(id_str, 10, &dom_id)) { 1596*92bd5a13SBabu Moger rdt_last_cmd_puts("Missing '=' or non-numeric domain id\n"); 1597*92bd5a13SBabu Moger return -EINVAL; 1598*92bd5a13SBabu Moger } 1599*92bd5a13SBabu Moger 1600*92bd5a13SBabu Moger if (!dom_str || kstrtoul(dom_str, 16, &val)) { 1601*92bd5a13SBabu Moger rdt_last_cmd_puts("Non-numeric event configuration value\n"); 1602*92bd5a13SBabu Moger return -EINVAL; 1603*92bd5a13SBabu Moger } 1604*92bd5a13SBabu Moger 1605*92bd5a13SBabu Moger list_for_each_entry(d, &r->domains, list) { 1606*92bd5a13SBabu Moger if (d->id == dom_id) { 1607*92bd5a13SBabu Moger ret = mbm_config_write_domain(r, d, evtid, val); 1608*92bd5a13SBabu Moger if (ret) 1609*92bd5a13SBabu Moger return -EINVAL; 1610*92bd5a13SBabu Moger goto next; 1611*92bd5a13SBabu Moger } 1612*92bd5a13SBabu Moger } 1613*92bd5a13SBabu Moger 1614*92bd5a13SBabu Moger return -EINVAL; 1615*92bd5a13SBabu Moger } 1616*92bd5a13SBabu Moger 1617*92bd5a13SBabu Moger static ssize_t mbm_total_bytes_config_write(struct kernfs_open_file *of, 1618*92bd5a13SBabu Moger char *buf, size_t nbytes, 1619*92bd5a13SBabu Moger loff_t off) 1620*92bd5a13SBabu Moger { 1621*92bd5a13SBabu Moger struct rdt_resource *r = of->kn->parent->priv; 1622*92bd5a13SBabu Moger int ret; 1623*92bd5a13SBabu Moger 1624*92bd5a13SBabu Moger /* Valid input requires a trailing newline */ 1625*92bd5a13SBabu Moger if (nbytes == 0 || buf[nbytes - 1] != '\n') 1626*92bd5a13SBabu Moger return -EINVAL; 1627*92bd5a13SBabu Moger 1628*92bd5a13SBabu Moger mutex_lock(&rdtgroup_mutex); 1629*92bd5a13SBabu Moger 1630*92bd5a13SBabu Moger rdt_last_cmd_clear(); 1631*92bd5a13SBabu Moger 1632*92bd5a13SBabu Moger buf[nbytes - 1] = '\0'; 1633*92bd5a13SBabu Moger 1634*92bd5a13SBabu Moger ret = mon_config_write(r, buf, QOS_L3_MBM_TOTAL_EVENT_ID); 1635*92bd5a13SBabu Moger 1636*92bd5a13SBabu Moger mutex_unlock(&rdtgroup_mutex); 1637*92bd5a13SBabu Moger 1638*92bd5a13SBabu Moger return ret ?: nbytes; 1639*92bd5a13SBabu Moger } 1640*92bd5a13SBabu Moger 1641fa7d9493SBabu Moger /* rdtgroup information files for one cache resource. */ 1642fa7d9493SBabu Moger static struct rftype res_common_files[] = { 1643fa7d9493SBabu Moger { 1644fa7d9493SBabu Moger .name = "last_cmd_status", 1645fa7d9493SBabu Moger .mode = 0444, 1646fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1647fa7d9493SBabu Moger .seq_show = rdt_last_cmd_status_show, 1648fa7d9493SBabu Moger .fflags = RF_TOP_INFO, 1649fa7d9493SBabu Moger }, 1650fa7d9493SBabu Moger { 1651fa7d9493SBabu Moger .name = "num_closids", 1652fa7d9493SBabu Moger .mode = 0444, 1653fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1654fa7d9493SBabu Moger .seq_show = rdt_num_closids_show, 1655fa7d9493SBabu Moger .fflags = RF_CTRL_INFO, 1656fa7d9493SBabu Moger }, 1657fa7d9493SBabu Moger { 1658fa7d9493SBabu Moger .name = "mon_features", 1659fa7d9493SBabu Moger .mode = 0444, 1660fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1661fa7d9493SBabu Moger .seq_show = rdt_mon_features_show, 1662fa7d9493SBabu Moger .fflags = RF_MON_INFO, 1663fa7d9493SBabu Moger }, 1664fa7d9493SBabu Moger { 1665fa7d9493SBabu Moger .name = "num_rmids", 1666fa7d9493SBabu Moger .mode = 0444, 1667fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1668fa7d9493SBabu Moger .seq_show = rdt_num_rmids_show, 1669fa7d9493SBabu Moger .fflags = RF_MON_INFO, 1670fa7d9493SBabu Moger }, 1671fa7d9493SBabu Moger { 1672fa7d9493SBabu Moger .name = "cbm_mask", 1673fa7d9493SBabu Moger .mode = 0444, 1674fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1675fa7d9493SBabu Moger .seq_show = rdt_default_ctrl_show, 1676fa7d9493SBabu Moger .fflags = RF_CTRL_INFO | RFTYPE_RES_CACHE, 1677fa7d9493SBabu Moger }, 1678fa7d9493SBabu Moger { 1679fa7d9493SBabu Moger .name = "min_cbm_bits", 1680fa7d9493SBabu Moger .mode = 0444, 1681fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1682fa7d9493SBabu Moger .seq_show = rdt_min_cbm_bits_show, 1683fa7d9493SBabu Moger .fflags = RF_CTRL_INFO | RFTYPE_RES_CACHE, 1684fa7d9493SBabu Moger }, 1685fa7d9493SBabu Moger { 1686fa7d9493SBabu Moger .name = "shareable_bits", 1687fa7d9493SBabu Moger .mode = 0444, 1688fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1689fa7d9493SBabu Moger .seq_show = rdt_shareable_bits_show, 1690fa7d9493SBabu Moger .fflags = RF_CTRL_INFO | RFTYPE_RES_CACHE, 1691fa7d9493SBabu Moger }, 1692fa7d9493SBabu Moger { 1693fa7d9493SBabu Moger .name = "bit_usage", 1694fa7d9493SBabu Moger .mode = 0444, 1695fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1696fa7d9493SBabu Moger .seq_show = rdt_bit_usage_show, 1697fa7d9493SBabu Moger .fflags = RF_CTRL_INFO | RFTYPE_RES_CACHE, 1698fa7d9493SBabu Moger }, 1699fa7d9493SBabu Moger { 1700fa7d9493SBabu Moger .name = "min_bandwidth", 1701fa7d9493SBabu Moger .mode = 0444, 1702fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1703fa7d9493SBabu Moger .seq_show = rdt_min_bw_show, 1704fa7d9493SBabu Moger .fflags = RF_CTRL_INFO | RFTYPE_RES_MB, 1705fa7d9493SBabu Moger }, 1706fa7d9493SBabu Moger { 1707fa7d9493SBabu Moger .name = "bandwidth_gran", 1708fa7d9493SBabu Moger .mode = 0444, 1709fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1710fa7d9493SBabu Moger .seq_show = rdt_bw_gran_show, 1711fa7d9493SBabu Moger .fflags = RF_CTRL_INFO | RFTYPE_RES_MB, 1712fa7d9493SBabu Moger }, 1713fa7d9493SBabu Moger { 1714fa7d9493SBabu Moger .name = "delay_linear", 1715fa7d9493SBabu Moger .mode = 0444, 1716fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1717fa7d9493SBabu Moger .seq_show = rdt_delay_linear_show, 1718fa7d9493SBabu Moger .fflags = RF_CTRL_INFO | RFTYPE_RES_MB, 1719fa7d9493SBabu Moger }, 172029b6bd41SFenghua Yu /* 172129b6bd41SFenghua Yu * Platform specific which (if any) capabilities are provided by 172229b6bd41SFenghua Yu * thread_throttle_mode. Defer "fflags" initialization to platform 172329b6bd41SFenghua Yu * discovery. 172429b6bd41SFenghua Yu */ 172529b6bd41SFenghua Yu { 172629b6bd41SFenghua Yu .name = "thread_throttle_mode", 172729b6bd41SFenghua Yu .mode = 0444, 172829b6bd41SFenghua Yu .kf_ops = &rdtgroup_kf_single_ops, 172929b6bd41SFenghua Yu .seq_show = rdt_thread_throttle_mode_show, 173029b6bd41SFenghua Yu }, 1731fa7d9493SBabu Moger { 1732fa7d9493SBabu Moger .name = "max_threshold_occupancy", 1733fa7d9493SBabu Moger .mode = 0644, 1734fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1735fa7d9493SBabu Moger .write = max_threshold_occ_write, 1736fa7d9493SBabu Moger .seq_show = max_threshold_occ_show, 1737fa7d9493SBabu Moger .fflags = RF_MON_INFO | RFTYPE_RES_CACHE, 1738fa7d9493SBabu Moger }, 1739fa7d9493SBabu Moger { 1740dc2a3e85SBabu Moger .name = "mbm_total_bytes_config", 1741*92bd5a13SBabu Moger .mode = 0644, 1742dc2a3e85SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1743dc2a3e85SBabu Moger .seq_show = mbm_total_bytes_config_show, 1744*92bd5a13SBabu Moger .write = mbm_total_bytes_config_write, 1745dc2a3e85SBabu Moger }, 1746dc2a3e85SBabu Moger { 174773afb2d3SBabu Moger .name = "mbm_local_bytes_config", 174873afb2d3SBabu Moger .mode = 0444, 174973afb2d3SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 175073afb2d3SBabu Moger .seq_show = mbm_local_bytes_config_show, 175173afb2d3SBabu Moger }, 175273afb2d3SBabu Moger { 1753fa7d9493SBabu Moger .name = "cpus", 1754fa7d9493SBabu Moger .mode = 0644, 1755fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1756fa7d9493SBabu Moger .write = rdtgroup_cpus_write, 1757fa7d9493SBabu Moger .seq_show = rdtgroup_cpus_show, 1758fa7d9493SBabu Moger .fflags = RFTYPE_BASE, 1759fa7d9493SBabu Moger }, 1760fa7d9493SBabu Moger { 1761fa7d9493SBabu Moger .name = "cpus_list", 1762fa7d9493SBabu Moger .mode = 0644, 1763fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1764fa7d9493SBabu Moger .write = rdtgroup_cpus_write, 1765fa7d9493SBabu Moger .seq_show = rdtgroup_cpus_show, 1766fa7d9493SBabu Moger .flags = RFTYPE_FLAGS_CPUS_LIST, 1767fa7d9493SBabu Moger .fflags = RFTYPE_BASE, 1768fa7d9493SBabu Moger }, 1769fa7d9493SBabu Moger { 1770fa7d9493SBabu Moger .name = "tasks", 1771fa7d9493SBabu Moger .mode = 0644, 1772fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1773fa7d9493SBabu Moger .write = rdtgroup_tasks_write, 1774fa7d9493SBabu Moger .seq_show = rdtgroup_tasks_show, 1775fa7d9493SBabu Moger .fflags = RFTYPE_BASE, 1776fa7d9493SBabu Moger }, 1777fa7d9493SBabu Moger { 1778fa7d9493SBabu Moger .name = "schemata", 1779fa7d9493SBabu Moger .mode = 0644, 1780fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1781fa7d9493SBabu Moger .write = rdtgroup_schemata_write, 1782fa7d9493SBabu Moger .seq_show = rdtgroup_schemata_show, 1783fa7d9493SBabu Moger .fflags = RF_CTRL_BASE, 1784fa7d9493SBabu Moger }, 1785fa7d9493SBabu Moger { 1786fa7d9493SBabu Moger .name = "mode", 1787fa7d9493SBabu Moger .mode = 0644, 1788fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1789fa7d9493SBabu Moger .write = rdtgroup_mode_write, 1790fa7d9493SBabu Moger .seq_show = rdtgroup_mode_show, 1791fa7d9493SBabu Moger .fflags = RF_CTRL_BASE, 1792fa7d9493SBabu Moger }, 1793fa7d9493SBabu Moger { 1794fa7d9493SBabu Moger .name = "size", 1795fa7d9493SBabu Moger .mode = 0444, 1796fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1797fa7d9493SBabu Moger .seq_show = rdtgroup_size_show, 1798fa7d9493SBabu Moger .fflags = RF_CTRL_BASE, 1799fa7d9493SBabu Moger }, 1800fa7d9493SBabu Moger 1801fa7d9493SBabu Moger }; 1802fa7d9493SBabu Moger 1803fa7d9493SBabu Moger static int rdtgroup_add_files(struct kernfs_node *kn, unsigned long fflags) 1804fa7d9493SBabu Moger { 1805fa7d9493SBabu Moger struct rftype *rfts, *rft; 1806fa7d9493SBabu Moger int ret, len; 1807fa7d9493SBabu Moger 1808fa7d9493SBabu Moger rfts = res_common_files; 1809fa7d9493SBabu Moger len = ARRAY_SIZE(res_common_files); 1810fa7d9493SBabu Moger 1811fa7d9493SBabu Moger lockdep_assert_held(&rdtgroup_mutex); 1812fa7d9493SBabu Moger 1813fa7d9493SBabu Moger for (rft = rfts; rft < rfts + len; rft++) { 181429b6bd41SFenghua Yu if (rft->fflags && ((fflags & rft->fflags) == rft->fflags)) { 1815fa7d9493SBabu Moger ret = rdtgroup_add_file(kn, rft); 1816fa7d9493SBabu Moger if (ret) 1817fa7d9493SBabu Moger goto error; 1818fa7d9493SBabu Moger } 1819fa7d9493SBabu Moger } 1820fa7d9493SBabu Moger 1821fa7d9493SBabu Moger return 0; 1822fa7d9493SBabu Moger error: 1823fa7d9493SBabu Moger pr_warn("Failed to add %s, err=%d\n", rft->name, ret); 1824fa7d9493SBabu Moger while (--rft >= rfts) { 1825fa7d9493SBabu Moger if ((fflags & rft->fflags) == rft->fflags) 1826fa7d9493SBabu Moger kernfs_remove_by_name(kn, rft->name); 1827fa7d9493SBabu Moger } 1828fa7d9493SBabu Moger return ret; 1829fa7d9493SBabu Moger } 1830fa7d9493SBabu Moger 183129b6bd41SFenghua Yu static struct rftype *rdtgroup_get_rftype_by_name(const char *name) 183229b6bd41SFenghua Yu { 183329b6bd41SFenghua Yu struct rftype *rfts, *rft; 183429b6bd41SFenghua Yu int len; 183529b6bd41SFenghua Yu 183629b6bd41SFenghua Yu rfts = res_common_files; 183729b6bd41SFenghua Yu len = ARRAY_SIZE(res_common_files); 183829b6bd41SFenghua Yu 183929b6bd41SFenghua Yu for (rft = rfts; rft < rfts + len; rft++) { 184029b6bd41SFenghua Yu if (!strcmp(rft->name, name)) 184129b6bd41SFenghua Yu return rft; 184229b6bd41SFenghua Yu } 184329b6bd41SFenghua Yu 184429b6bd41SFenghua Yu return NULL; 184529b6bd41SFenghua Yu } 184629b6bd41SFenghua Yu 184729b6bd41SFenghua Yu void __init thread_throttle_mode_init(void) 184829b6bd41SFenghua Yu { 184929b6bd41SFenghua Yu struct rftype *rft; 185029b6bd41SFenghua Yu 185129b6bd41SFenghua Yu rft = rdtgroup_get_rftype_by_name("thread_throttle_mode"); 185229b6bd41SFenghua Yu if (!rft) 185329b6bd41SFenghua Yu return; 185429b6bd41SFenghua Yu 185529b6bd41SFenghua Yu rft->fflags = RF_CTRL_INFO | RFTYPE_RES_MB; 185629b6bd41SFenghua Yu } 185729b6bd41SFenghua Yu 1858dc2a3e85SBabu Moger void __init mbm_config_rftype_init(const char *config) 1859dc2a3e85SBabu Moger { 1860dc2a3e85SBabu Moger struct rftype *rft; 1861dc2a3e85SBabu Moger 1862dc2a3e85SBabu Moger rft = rdtgroup_get_rftype_by_name(config); 1863dc2a3e85SBabu Moger if (rft) 1864dc2a3e85SBabu Moger rft->fflags = RF_MON_INFO | RFTYPE_RES_CACHE; 1865dc2a3e85SBabu Moger } 1866dc2a3e85SBabu Moger 1867fa7d9493SBabu Moger /** 1868fa7d9493SBabu Moger * rdtgroup_kn_mode_restrict - Restrict user access to named resctrl file 1869fa7d9493SBabu Moger * @r: The resource group with which the file is associated. 1870fa7d9493SBabu Moger * @name: Name of the file 1871fa7d9493SBabu Moger * 1872fa7d9493SBabu Moger * The permissions of named resctrl file, directory, or link are modified 1873fa7d9493SBabu Moger * to not allow read, write, or execute by any user. 1874fa7d9493SBabu Moger * 1875fa7d9493SBabu Moger * WARNING: This function is intended to communicate to the user that the 1876fa7d9493SBabu Moger * resctrl file has been locked down - that it is not relevant to the 1877fa7d9493SBabu Moger * particular state the system finds itself in. It should not be relied 1878fa7d9493SBabu Moger * on to protect from user access because after the file's permissions 1879fa7d9493SBabu Moger * are restricted the user can still change the permissions using chmod 1880fa7d9493SBabu Moger * from the command line. 1881fa7d9493SBabu Moger * 1882fa7d9493SBabu Moger * Return: 0 on success, <0 on failure. 1883fa7d9493SBabu Moger */ 1884fa7d9493SBabu Moger int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name) 1885fa7d9493SBabu Moger { 1886fa7d9493SBabu Moger struct iattr iattr = {.ia_valid = ATTR_MODE,}; 1887fa7d9493SBabu Moger struct kernfs_node *kn; 1888fa7d9493SBabu Moger int ret = 0; 1889fa7d9493SBabu Moger 1890fa7d9493SBabu Moger kn = kernfs_find_and_get_ns(r->kn, name, NULL); 1891fa7d9493SBabu Moger if (!kn) 1892fa7d9493SBabu Moger return -ENOENT; 1893fa7d9493SBabu Moger 1894fa7d9493SBabu Moger switch (kernfs_type(kn)) { 1895fa7d9493SBabu Moger case KERNFS_DIR: 1896fa7d9493SBabu Moger iattr.ia_mode = S_IFDIR; 1897fa7d9493SBabu Moger break; 1898fa7d9493SBabu Moger case KERNFS_FILE: 1899fa7d9493SBabu Moger iattr.ia_mode = S_IFREG; 1900fa7d9493SBabu Moger break; 1901fa7d9493SBabu Moger case KERNFS_LINK: 1902fa7d9493SBabu Moger iattr.ia_mode = S_IFLNK; 1903fa7d9493SBabu Moger break; 1904fa7d9493SBabu Moger } 1905fa7d9493SBabu Moger 1906fa7d9493SBabu Moger ret = kernfs_setattr(kn, &iattr); 1907fa7d9493SBabu Moger kernfs_put(kn); 1908fa7d9493SBabu Moger return ret; 1909fa7d9493SBabu Moger } 1910fa7d9493SBabu Moger 1911fa7d9493SBabu Moger /** 1912fa7d9493SBabu Moger * rdtgroup_kn_mode_restore - Restore user access to named resctrl file 1913fa7d9493SBabu Moger * @r: The resource group with which the file is associated. 1914fa7d9493SBabu Moger * @name: Name of the file 1915fa7d9493SBabu Moger * @mask: Mask of permissions that should be restored 1916fa7d9493SBabu Moger * 1917fa7d9493SBabu Moger * Restore the permissions of the named file. If @name is a directory the 1918fa7d9493SBabu Moger * permissions of its parent will be used. 1919fa7d9493SBabu Moger * 1920fa7d9493SBabu Moger * Return: 0 on success, <0 on failure. 1921fa7d9493SBabu Moger */ 1922fa7d9493SBabu Moger int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name, 1923fa7d9493SBabu Moger umode_t mask) 1924fa7d9493SBabu Moger { 1925fa7d9493SBabu Moger struct iattr iattr = {.ia_valid = ATTR_MODE,}; 1926fa7d9493SBabu Moger struct kernfs_node *kn, *parent; 1927fa7d9493SBabu Moger struct rftype *rfts, *rft; 1928fa7d9493SBabu Moger int ret, len; 1929fa7d9493SBabu Moger 1930fa7d9493SBabu Moger rfts = res_common_files; 1931fa7d9493SBabu Moger len = ARRAY_SIZE(res_common_files); 1932fa7d9493SBabu Moger 1933fa7d9493SBabu Moger for (rft = rfts; rft < rfts + len; rft++) { 1934fa7d9493SBabu Moger if (!strcmp(rft->name, name)) 1935fa7d9493SBabu Moger iattr.ia_mode = rft->mode & mask; 1936fa7d9493SBabu Moger } 1937fa7d9493SBabu Moger 1938fa7d9493SBabu Moger kn = kernfs_find_and_get_ns(r->kn, name, NULL); 1939fa7d9493SBabu Moger if (!kn) 1940fa7d9493SBabu Moger return -ENOENT; 1941fa7d9493SBabu Moger 1942fa7d9493SBabu Moger switch (kernfs_type(kn)) { 1943fa7d9493SBabu Moger case KERNFS_DIR: 1944fa7d9493SBabu Moger parent = kernfs_get_parent(kn); 1945fa7d9493SBabu Moger if (parent) { 1946fa7d9493SBabu Moger iattr.ia_mode |= parent->mode; 1947fa7d9493SBabu Moger kernfs_put(parent); 1948fa7d9493SBabu Moger } 1949fa7d9493SBabu Moger iattr.ia_mode |= S_IFDIR; 1950fa7d9493SBabu Moger break; 1951fa7d9493SBabu Moger case KERNFS_FILE: 1952fa7d9493SBabu Moger iattr.ia_mode |= S_IFREG; 1953fa7d9493SBabu Moger break; 1954fa7d9493SBabu Moger case KERNFS_LINK: 1955fa7d9493SBabu Moger iattr.ia_mode |= S_IFLNK; 1956fa7d9493SBabu Moger break; 1957fa7d9493SBabu Moger } 1958fa7d9493SBabu Moger 1959fa7d9493SBabu Moger ret = kernfs_setattr(kn, &iattr); 1960fa7d9493SBabu Moger kernfs_put(kn); 1961fa7d9493SBabu Moger return ret; 1962fa7d9493SBabu Moger } 1963fa7d9493SBabu Moger 1964f2594492SJames Morse static int rdtgroup_mkdir_info_resdir(void *priv, char *name, 1965fa7d9493SBabu Moger unsigned long fflags) 1966fa7d9493SBabu Moger { 1967fa7d9493SBabu Moger struct kernfs_node *kn_subdir; 1968fa7d9493SBabu Moger int ret; 1969fa7d9493SBabu Moger 1970fa7d9493SBabu Moger kn_subdir = kernfs_create_dir(kn_info, name, 1971f2594492SJames Morse kn_info->mode, priv); 1972fa7d9493SBabu Moger if (IS_ERR(kn_subdir)) 1973fa7d9493SBabu Moger return PTR_ERR(kn_subdir); 1974fa7d9493SBabu Moger 1975fa7d9493SBabu Moger ret = rdtgroup_kn_set_ugid(kn_subdir); 1976fa7d9493SBabu Moger if (ret) 1977fa7d9493SBabu Moger return ret; 1978fa7d9493SBabu Moger 1979fa7d9493SBabu Moger ret = rdtgroup_add_files(kn_subdir, fflags); 1980fa7d9493SBabu Moger if (!ret) 1981fa7d9493SBabu Moger kernfs_activate(kn_subdir); 1982fa7d9493SBabu Moger 1983fa7d9493SBabu Moger return ret; 1984fa7d9493SBabu Moger } 1985fa7d9493SBabu Moger 1986fa7d9493SBabu Moger static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn) 1987fa7d9493SBabu Moger { 1988f2594492SJames Morse struct resctrl_schema *s; 1989fa7d9493SBabu Moger struct rdt_resource *r; 1990fa7d9493SBabu Moger unsigned long fflags; 1991fa7d9493SBabu Moger char name[32]; 1992fa7d9493SBabu Moger int ret; 1993fa7d9493SBabu Moger 1994fa7d9493SBabu Moger /* create the directory */ 1995fa7d9493SBabu Moger kn_info = kernfs_create_dir(parent_kn, "info", parent_kn->mode, NULL); 1996fa7d9493SBabu Moger if (IS_ERR(kn_info)) 1997fa7d9493SBabu Moger return PTR_ERR(kn_info); 1998fa7d9493SBabu Moger 1999fa7d9493SBabu Moger ret = rdtgroup_add_files(kn_info, RF_TOP_INFO); 2000fa7d9493SBabu Moger if (ret) 2001fa7d9493SBabu Moger goto out_destroy; 2002fa7d9493SBabu Moger 20034d269ed4SJames Morse /* loop over enabled controls, these are all alloc_capable */ 2004f2594492SJames Morse list_for_each_entry(s, &resctrl_schema_all, list) { 2005f2594492SJames Morse r = s->res; 2006fa7d9493SBabu Moger fflags = r->fflags | RF_CTRL_INFO; 2007e198fde3SJames Morse ret = rdtgroup_mkdir_info_resdir(s, s->name, fflags); 2008fa7d9493SBabu Moger if (ret) 2009fa7d9493SBabu Moger goto out_destroy; 2010fa7d9493SBabu Moger } 2011fa7d9493SBabu Moger 2012bab6ee73SJames Morse for_each_mon_capable_rdt_resource(r) { 2013fa7d9493SBabu Moger fflags = r->fflags | RF_MON_INFO; 2014fa7d9493SBabu Moger sprintf(name, "%s_MON", r->name); 2015fa7d9493SBabu Moger ret = rdtgroup_mkdir_info_resdir(r, name, fflags); 2016fa7d9493SBabu Moger if (ret) 2017fa7d9493SBabu Moger goto out_destroy; 2018fa7d9493SBabu Moger } 2019fa7d9493SBabu Moger 2020fa7d9493SBabu Moger ret = rdtgroup_kn_set_ugid(kn_info); 2021fa7d9493SBabu Moger if (ret) 2022fa7d9493SBabu Moger goto out_destroy; 2023fa7d9493SBabu Moger 2024fa7d9493SBabu Moger kernfs_activate(kn_info); 2025fa7d9493SBabu Moger 2026fa7d9493SBabu Moger return 0; 2027fa7d9493SBabu Moger 2028fa7d9493SBabu Moger out_destroy: 2029fa7d9493SBabu Moger kernfs_remove(kn_info); 2030fa7d9493SBabu Moger return ret; 2031fa7d9493SBabu Moger } 2032fa7d9493SBabu Moger 2033fa7d9493SBabu Moger static int 2034fa7d9493SBabu Moger mongroup_create_dir(struct kernfs_node *parent_kn, struct rdtgroup *prgrp, 2035fa7d9493SBabu Moger char *name, struct kernfs_node **dest_kn) 2036fa7d9493SBabu Moger { 2037fa7d9493SBabu Moger struct kernfs_node *kn; 2038fa7d9493SBabu Moger int ret; 2039fa7d9493SBabu Moger 2040fa7d9493SBabu Moger /* create the directory */ 2041fa7d9493SBabu Moger kn = kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp); 2042fa7d9493SBabu Moger if (IS_ERR(kn)) 2043fa7d9493SBabu Moger return PTR_ERR(kn); 2044fa7d9493SBabu Moger 2045fa7d9493SBabu Moger if (dest_kn) 2046fa7d9493SBabu Moger *dest_kn = kn; 2047fa7d9493SBabu Moger 2048fa7d9493SBabu Moger ret = rdtgroup_kn_set_ugid(kn); 2049fa7d9493SBabu Moger if (ret) 2050fa7d9493SBabu Moger goto out_destroy; 2051fa7d9493SBabu Moger 2052fa7d9493SBabu Moger kernfs_activate(kn); 2053fa7d9493SBabu Moger 2054fa7d9493SBabu Moger return 0; 2055fa7d9493SBabu Moger 2056fa7d9493SBabu Moger out_destroy: 2057fa7d9493SBabu Moger kernfs_remove(kn); 2058fa7d9493SBabu Moger return ret; 2059fa7d9493SBabu Moger } 2060fa7d9493SBabu Moger 2061fa7d9493SBabu Moger static void l3_qos_cfg_update(void *arg) 2062fa7d9493SBabu Moger { 2063fa7d9493SBabu Moger bool *enable = arg; 2064fa7d9493SBabu Moger 2065aa50453aSBabu Moger wrmsrl(MSR_IA32_L3_QOS_CFG, *enable ? L3_QOS_CDP_ENABLE : 0ULL); 2066fa7d9493SBabu Moger } 2067fa7d9493SBabu Moger 2068fa7d9493SBabu Moger static void l2_qos_cfg_update(void *arg) 2069fa7d9493SBabu Moger { 2070fa7d9493SBabu Moger bool *enable = arg; 2071fa7d9493SBabu Moger 2072aa50453aSBabu Moger wrmsrl(MSR_IA32_L2_QOS_CFG, *enable ? L2_QOS_CDP_ENABLE : 0ULL); 2073fa7d9493SBabu Moger } 2074fa7d9493SBabu Moger 2075fa7d9493SBabu Moger static inline bool is_mba_linear(void) 2076fa7d9493SBabu Moger { 207763c8b123SJames Morse return rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl.membw.delay_linear; 2078fa7d9493SBabu Moger } 2079fa7d9493SBabu Moger 2080fa7d9493SBabu Moger static int set_cache_qos_cfg(int level, bool enable) 2081fa7d9493SBabu Moger { 2082fa7d9493SBabu Moger void (*update)(void *arg); 2083fa7d9493SBabu Moger struct rdt_resource *r_l; 2084fa7d9493SBabu Moger cpumask_var_t cpu_mask; 2085fa7d9493SBabu Moger struct rdt_domain *d; 2086fa7d9493SBabu Moger int cpu; 2087fa7d9493SBabu Moger 2088fa7d9493SBabu Moger if (level == RDT_RESOURCE_L3) 2089fa7d9493SBabu Moger update = l3_qos_cfg_update; 2090fa7d9493SBabu Moger else if (level == RDT_RESOURCE_L2) 2091fa7d9493SBabu Moger update = l2_qos_cfg_update; 2092fa7d9493SBabu Moger else 2093fa7d9493SBabu Moger return -EINVAL; 2094fa7d9493SBabu Moger 2095ab6a2114SShakeel Butt if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL)) 2096ab6a2114SShakeel Butt return -ENOMEM; 2097ab6a2114SShakeel Butt 209863c8b123SJames Morse r_l = &rdt_resources_all[level].r_resctrl; 2099fa7d9493SBabu Moger list_for_each_entry(d, &r_l->domains, list) { 2100fae3a13dSBabu Moger if (r_l->cache.arch_has_per_cpu_cfg) 2101fae3a13dSBabu Moger /* Pick all the CPUs in the domain instance */ 2102fae3a13dSBabu Moger for_each_cpu(cpu, &d->cpu_mask) 2103fae3a13dSBabu Moger cpumask_set_cpu(cpu, cpu_mask); 2104fae3a13dSBabu Moger else 2105fa7d9493SBabu Moger /* Pick one CPU from each domain instance to update MSR */ 2106fa7d9493SBabu Moger cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask); 2107fa7d9493SBabu Moger } 2108fc3b618cSBabu Moger 2109fc3b618cSBabu Moger /* Update QOS_CFG MSR on all the CPUs in cpu_mask */ 2110fc3b618cSBabu Moger on_each_cpu_mask(cpu_mask, update, &enable, 1); 2111fa7d9493SBabu Moger 2112fa7d9493SBabu Moger free_cpumask_var(cpu_mask); 2113fa7d9493SBabu Moger 2114fa7d9493SBabu Moger return 0; 2115fa7d9493SBabu Moger } 2116fa7d9493SBabu Moger 21179fe04507SJames Morse /* Restore the qos cfg state when a domain comes online */ 21189fe04507SJames Morse void rdt_domain_reconfigure_cdp(struct rdt_resource *r) 21199fe04507SJames Morse { 2120c091e907SJames Morse struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r); 2121c091e907SJames Morse 2122c091e907SJames Morse if (!r->cdp_capable) 21239fe04507SJames Morse return; 21249fe04507SJames Morse 21255c3b63cdSJames Morse if (r->rid == RDT_RESOURCE_L2) 2126c091e907SJames Morse l2_qos_cfg_update(&hw_res->cdp_enabled); 21279fe04507SJames Morse 21285c3b63cdSJames Morse if (r->rid == RDT_RESOURCE_L3) 2129c091e907SJames Morse l3_qos_cfg_update(&hw_res->cdp_enabled); 21309fe04507SJames Morse } 21319fe04507SJames Morse 2132781096d9SJames Morse static int mba_sc_domain_allocate(struct rdt_resource *r, struct rdt_domain *d) 2133781096d9SJames Morse { 2134781096d9SJames Morse u32 num_closid = resctrl_arch_get_num_closid(r); 2135781096d9SJames Morse int cpu = cpumask_any(&d->cpu_mask); 2136781096d9SJames Morse int i; 2137781096d9SJames Morse 2138781096d9SJames Morse d->mbps_val = kcalloc_node(num_closid, sizeof(*d->mbps_val), 2139781096d9SJames Morse GFP_KERNEL, cpu_to_node(cpu)); 2140781096d9SJames Morse if (!d->mbps_val) 2141781096d9SJames Morse return -ENOMEM; 2142781096d9SJames Morse 2143781096d9SJames Morse for (i = 0; i < num_closid; i++) 2144781096d9SJames Morse d->mbps_val[i] = MBA_MAX_MBPS; 2145781096d9SJames Morse 2146781096d9SJames Morse return 0; 2147781096d9SJames Morse } 2148781096d9SJames Morse 2149781096d9SJames Morse static void mba_sc_domain_destroy(struct rdt_resource *r, 2150781096d9SJames Morse struct rdt_domain *d) 2151781096d9SJames Morse { 2152781096d9SJames Morse kfree(d->mbps_val); 2153781096d9SJames Morse d->mbps_val = NULL; 2154781096d9SJames Morse } 2155781096d9SJames Morse 2156fa7d9493SBabu Moger /* 2157fa7d9493SBabu Moger * MBA software controller is supported only if 2158fa7d9493SBabu Moger * MBM is supported and MBA is in linear scale. 2159fa7d9493SBabu Moger */ 2160b045c215SJames Morse static bool supports_mba_mbps(void) 2161b045c215SJames Morse { 2162b045c215SJames Morse struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl; 2163b045c215SJames Morse 2164b045c215SJames Morse return (is_mbm_local_enabled() && 2165b045c215SJames Morse r->alloc_capable && is_mba_linear()); 2166b045c215SJames Morse } 2167b045c215SJames Morse 2168b045c215SJames Morse /* 2169b045c215SJames Morse * Enable or disable the MBA software controller 2170b045c215SJames Morse * which helps user specify bandwidth in MBps. 2171b045c215SJames Morse */ 2172fa7d9493SBabu Moger static int set_mba_sc(bool mba_sc) 2173fa7d9493SBabu Moger { 217463c8b123SJames Morse struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl; 2175781096d9SJames Morse u32 num_closid = resctrl_arch_get_num_closid(r); 2176781096d9SJames Morse struct rdt_domain *d; 2177781096d9SJames Morse int i; 2178fa7d9493SBabu Moger 2179b045c215SJames Morse if (!supports_mba_mbps() || mba_sc == is_mba_sc(r)) 2180fa7d9493SBabu Moger return -EINVAL; 2181fa7d9493SBabu Moger 2182fa7d9493SBabu Moger r->membw.mba_sc = mba_sc; 2183fa7d9493SBabu Moger 2184781096d9SJames Morse list_for_each_entry(d, &r->domains, list) { 2185781096d9SJames Morse for (i = 0; i < num_closid; i++) 2186781096d9SJames Morse d->mbps_val[i] = MBA_MAX_MBPS; 2187781096d9SJames Morse } 2188781096d9SJames Morse 2189fa7d9493SBabu Moger return 0; 2190fa7d9493SBabu Moger } 2191fa7d9493SBabu Moger 21925c3b63cdSJames Morse static int cdp_enable(int level) 2193fa7d9493SBabu Moger { 219463c8b123SJames Morse struct rdt_resource *r_l = &rdt_resources_all[level].r_resctrl; 2195fa7d9493SBabu Moger int ret; 2196fa7d9493SBabu Moger 21975c3b63cdSJames Morse if (!r_l->alloc_capable) 2198fa7d9493SBabu Moger return -EINVAL; 2199fa7d9493SBabu Moger 2200fa7d9493SBabu Moger ret = set_cache_qos_cfg(level, true); 22015c3b63cdSJames Morse if (!ret) 2202c091e907SJames Morse rdt_resources_all[level].cdp_enabled = true; 22035c3b63cdSJames Morse 2204fa7d9493SBabu Moger return ret; 2205fa7d9493SBabu Moger } 2206fa7d9493SBabu Moger 22075c3b63cdSJames Morse static void cdp_disable(int level) 2208fa7d9493SBabu Moger { 2209c091e907SJames Morse struct rdt_hw_resource *r_hw = &rdt_resources_all[level]; 2210fa7d9493SBabu Moger 2211c091e907SJames Morse if (r_hw->cdp_enabled) { 2212fa7d9493SBabu Moger set_cache_qos_cfg(level, false); 2213c091e907SJames Morse r_hw->cdp_enabled = false; 2214fa7d9493SBabu Moger } 2215fa7d9493SBabu Moger } 2216fa7d9493SBabu Moger 2217c091e907SJames Morse int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable) 2218fa7d9493SBabu Moger { 2219c091e907SJames Morse struct rdt_hw_resource *hw_res = &rdt_resources_all[l]; 2220c091e907SJames Morse 2221c091e907SJames Morse if (!hw_res->r_resctrl.cdp_capable) 2222c091e907SJames Morse return -EINVAL; 2223c091e907SJames Morse 2224c091e907SJames Morse if (enable) 22255c3b63cdSJames Morse return cdp_enable(l); 2226c091e907SJames Morse 22275c3b63cdSJames Morse cdp_disable(l); 2228c091e907SJames Morse 2229c091e907SJames Morse return 0; 2230fa7d9493SBabu Moger } 2231fa7d9493SBabu Moger 2232fa7d9493SBabu Moger static void cdp_disable_all(void) 2233fa7d9493SBabu Moger { 2234c091e907SJames Morse if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3)) 2235c091e907SJames Morse resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false); 2236c091e907SJames Morse if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2)) 2237c091e907SJames Morse resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false); 2238fa7d9493SBabu Moger } 2239fa7d9493SBabu Moger 2240fa7d9493SBabu Moger /* 2241fa7d9493SBabu Moger * We don't allow rdtgroup directories to be created anywhere 2242fa7d9493SBabu Moger * except the root directory. Thus when looking for the rdtgroup 2243fa7d9493SBabu Moger * structure for a kernfs node we are either looking at a directory, 2244fa7d9493SBabu Moger * in which case the rdtgroup structure is pointed at by the "priv" 2245fa7d9493SBabu Moger * field, otherwise we have a file, and need only look to the parent 2246fa7d9493SBabu Moger * to find the rdtgroup. 2247fa7d9493SBabu Moger */ 2248fa7d9493SBabu Moger static struct rdtgroup *kernfs_to_rdtgroup(struct kernfs_node *kn) 2249fa7d9493SBabu Moger { 2250fa7d9493SBabu Moger if (kernfs_type(kn) == KERNFS_DIR) { 2251fa7d9493SBabu Moger /* 2252fa7d9493SBabu Moger * All the resource directories use "kn->priv" 2253fa7d9493SBabu Moger * to point to the "struct rdtgroup" for the 2254fa7d9493SBabu Moger * resource. "info" and its subdirectories don't 2255fa7d9493SBabu Moger * have rdtgroup structures, so return NULL here. 2256fa7d9493SBabu Moger */ 2257fa7d9493SBabu Moger if (kn == kn_info || kn->parent == kn_info) 2258fa7d9493SBabu Moger return NULL; 2259fa7d9493SBabu Moger else 2260fa7d9493SBabu Moger return kn->priv; 2261fa7d9493SBabu Moger } else { 2262fa7d9493SBabu Moger return kn->parent->priv; 2263fa7d9493SBabu Moger } 2264fa7d9493SBabu Moger } 2265fa7d9493SBabu Moger 2266fa7d9493SBabu Moger struct rdtgroup *rdtgroup_kn_lock_live(struct kernfs_node *kn) 2267fa7d9493SBabu Moger { 2268fa7d9493SBabu Moger struct rdtgroup *rdtgrp = kernfs_to_rdtgroup(kn); 2269fa7d9493SBabu Moger 2270fa7d9493SBabu Moger if (!rdtgrp) 2271fa7d9493SBabu Moger return NULL; 2272fa7d9493SBabu Moger 2273fa7d9493SBabu Moger atomic_inc(&rdtgrp->waitcount); 2274fa7d9493SBabu Moger kernfs_break_active_protection(kn); 2275fa7d9493SBabu Moger 2276fa7d9493SBabu Moger mutex_lock(&rdtgroup_mutex); 2277fa7d9493SBabu Moger 2278fa7d9493SBabu Moger /* Was this group deleted while we waited? */ 2279fa7d9493SBabu Moger if (rdtgrp->flags & RDT_DELETED) 2280fa7d9493SBabu Moger return NULL; 2281fa7d9493SBabu Moger 2282fa7d9493SBabu Moger return rdtgrp; 2283fa7d9493SBabu Moger } 2284fa7d9493SBabu Moger 2285fa7d9493SBabu Moger void rdtgroup_kn_unlock(struct kernfs_node *kn) 2286fa7d9493SBabu Moger { 2287fa7d9493SBabu Moger struct rdtgroup *rdtgrp = kernfs_to_rdtgroup(kn); 2288fa7d9493SBabu Moger 2289fa7d9493SBabu Moger if (!rdtgrp) 2290fa7d9493SBabu Moger return; 2291fa7d9493SBabu Moger 2292fa7d9493SBabu Moger mutex_unlock(&rdtgroup_mutex); 2293fa7d9493SBabu Moger 2294fa7d9493SBabu Moger if (atomic_dec_and_test(&rdtgrp->waitcount) && 2295fa7d9493SBabu Moger (rdtgrp->flags & RDT_DELETED)) { 2296fa7d9493SBabu Moger if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP || 2297fa7d9493SBabu Moger rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) 2298fa7d9493SBabu Moger rdtgroup_pseudo_lock_remove(rdtgrp); 2299fa7d9493SBabu Moger kernfs_unbreak_active_protection(kn); 230075899924SXiaochen Shen rdtgroup_remove(rdtgrp); 2301fa7d9493SBabu Moger } else { 2302fa7d9493SBabu Moger kernfs_unbreak_active_protection(kn); 2303fa7d9493SBabu Moger } 2304fa7d9493SBabu Moger } 2305fa7d9493SBabu Moger 2306fa7d9493SBabu Moger static int mkdir_mondata_all(struct kernfs_node *parent_kn, 2307fa7d9493SBabu Moger struct rdtgroup *prgrp, 2308fa7d9493SBabu Moger struct kernfs_node **mon_data_kn); 2309fa7d9493SBabu Moger 231023bf1b6bSDavid Howells static int rdt_enable_ctx(struct rdt_fs_context *ctx) 2311fa7d9493SBabu Moger { 231223bf1b6bSDavid Howells int ret = 0; 231323bf1b6bSDavid Howells 231423bf1b6bSDavid Howells if (ctx->enable_cdpl2) 2315c091e907SJames Morse ret = resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, true); 231623bf1b6bSDavid Howells 231723bf1b6bSDavid Howells if (!ret && ctx->enable_cdpl3) 2318c091e907SJames Morse ret = resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, true); 231923bf1b6bSDavid Howells 232023bf1b6bSDavid Howells if (!ret && ctx->enable_mba_mbps) 232123bf1b6bSDavid Howells ret = set_mba_sc(true); 232223bf1b6bSDavid Howells 232323bf1b6bSDavid Howells return ret; 232423bf1b6bSDavid Howells } 232523bf1b6bSDavid Howells 23265c3b63cdSJames Morse static int schemata_list_add(struct rdt_resource *r, enum resctrl_conf_type type) 2327cdb9ebc9SJames Morse { 2328cdb9ebc9SJames Morse struct resctrl_schema *s; 23295c3b63cdSJames Morse const char *suffix = ""; 2330e198fde3SJames Morse int ret, cl; 2331cdb9ebc9SJames Morse 2332cdb9ebc9SJames Morse s = kzalloc(sizeof(*s), GFP_KERNEL); 2333cdb9ebc9SJames Morse if (!s) 2334cdb9ebc9SJames Morse return -ENOMEM; 2335cdb9ebc9SJames Morse 2336cdb9ebc9SJames Morse s->res = r; 2337eb6f3187SJames Morse s->num_closid = resctrl_arch_get_num_closid(r); 2338141739aaSJames Morse if (resctrl_arch_get_cdp_enabled(r->rid)) 2339141739aaSJames Morse s->num_closid /= 2; 2340cdb9ebc9SJames Morse 23415c3b63cdSJames Morse s->conf_type = type; 23425c3b63cdSJames Morse switch (type) { 23435c3b63cdSJames Morse case CDP_CODE: 23445c3b63cdSJames Morse suffix = "CODE"; 23455c3b63cdSJames Morse break; 23465c3b63cdSJames Morse case CDP_DATA: 23475c3b63cdSJames Morse suffix = "DATA"; 23485c3b63cdSJames Morse break; 23495c3b63cdSJames Morse case CDP_NONE: 23505c3b63cdSJames Morse suffix = ""; 23515c3b63cdSJames Morse break; 23525c3b63cdSJames Morse } 23535c3b63cdSJames Morse 23545c3b63cdSJames Morse ret = snprintf(s->name, sizeof(s->name), "%s%s", r->name, suffix); 2355e198fde3SJames Morse if (ret >= sizeof(s->name)) { 2356e198fde3SJames Morse kfree(s); 2357e198fde3SJames Morse return -EINVAL; 2358e198fde3SJames Morse } 2359e198fde3SJames Morse 2360e198fde3SJames Morse cl = strlen(s->name); 2361e198fde3SJames Morse 2362e198fde3SJames Morse /* 2363e198fde3SJames Morse * If CDP is supported by this resource, but not enabled, 2364e198fde3SJames Morse * include the suffix. This ensures the tabular format of the 23655c3b63cdSJames Morse * schemata file does not change between mounts of the filesystem. 2366e198fde3SJames Morse */ 2367e198fde3SJames Morse if (r->cdp_capable && !resctrl_arch_get_cdp_enabled(r->rid)) 2368e198fde3SJames Morse cl += 4; 2369e198fde3SJames Morse 2370e198fde3SJames Morse if (cl > max_name_width) 2371e198fde3SJames Morse max_name_width = cl; 2372e198fde3SJames Morse 2373cdb9ebc9SJames Morse INIT_LIST_HEAD(&s->list); 2374cdb9ebc9SJames Morse list_add(&s->list, &resctrl_schema_all); 2375cdb9ebc9SJames Morse 2376cdb9ebc9SJames Morse return 0; 2377cdb9ebc9SJames Morse } 2378cdb9ebc9SJames Morse 23795c3b63cdSJames Morse static int schemata_list_create(void) 23805c3b63cdSJames Morse { 23815c3b63cdSJames Morse struct rdt_resource *r; 23825c3b63cdSJames Morse int ret = 0; 23835c3b63cdSJames Morse 23844d269ed4SJames Morse for_each_alloc_capable_rdt_resource(r) { 23855c3b63cdSJames Morse if (resctrl_arch_get_cdp_enabled(r->rid)) { 23865c3b63cdSJames Morse ret = schemata_list_add(r, CDP_CODE); 23875c3b63cdSJames Morse if (ret) 23885c3b63cdSJames Morse break; 23895c3b63cdSJames Morse 23905c3b63cdSJames Morse ret = schemata_list_add(r, CDP_DATA); 23915c3b63cdSJames Morse } else { 23925c3b63cdSJames Morse ret = schemata_list_add(r, CDP_NONE); 23935c3b63cdSJames Morse } 23945c3b63cdSJames Morse 23955c3b63cdSJames Morse if (ret) 23965c3b63cdSJames Morse break; 23975c3b63cdSJames Morse } 23985c3b63cdSJames Morse 23995c3b63cdSJames Morse return ret; 24005c3b63cdSJames Morse } 24015c3b63cdSJames Morse 2402cdb9ebc9SJames Morse static void schemata_list_destroy(void) 2403cdb9ebc9SJames Morse { 2404cdb9ebc9SJames Morse struct resctrl_schema *s, *tmp; 2405cdb9ebc9SJames Morse 2406cdb9ebc9SJames Morse list_for_each_entry_safe(s, tmp, &resctrl_schema_all, list) { 2407cdb9ebc9SJames Morse list_del(&s->list); 2408cdb9ebc9SJames Morse kfree(s); 2409cdb9ebc9SJames Morse } 2410cdb9ebc9SJames Morse } 2411cdb9ebc9SJames Morse 241223bf1b6bSDavid Howells static int rdt_get_tree(struct fs_context *fc) 241323bf1b6bSDavid Howells { 241423bf1b6bSDavid Howells struct rdt_fs_context *ctx = rdt_fc2context(fc); 2415fa7d9493SBabu Moger struct rdt_domain *dom; 2416fa7d9493SBabu Moger struct rdt_resource *r; 2417fa7d9493SBabu Moger int ret; 2418fa7d9493SBabu Moger 2419fa7d9493SBabu Moger cpus_read_lock(); 2420fa7d9493SBabu Moger mutex_lock(&rdtgroup_mutex); 2421fa7d9493SBabu Moger /* 2422fa7d9493SBabu Moger * resctrl file system can only be mounted once. 2423fa7d9493SBabu Moger */ 2424fa7d9493SBabu Moger if (static_branch_unlikely(&rdt_enable_key)) { 242523bf1b6bSDavid Howells ret = -EBUSY; 2426fa7d9493SBabu Moger goto out; 2427fa7d9493SBabu Moger } 2428fa7d9493SBabu Moger 242923bf1b6bSDavid Howells ret = rdt_enable_ctx(ctx); 243023bf1b6bSDavid Howells if (ret < 0) 2431fa7d9493SBabu Moger goto out_cdp; 2432fa7d9493SBabu Moger 2433cdb9ebc9SJames Morse ret = schemata_list_create(); 2434cdb9ebc9SJames Morse if (ret) { 2435cdb9ebc9SJames Morse schemata_list_destroy(); 2436cdb9ebc9SJames Morse goto out_mba; 2437cdb9ebc9SJames Morse } 2438cdb9ebc9SJames Morse 2439fa7d9493SBabu Moger closid_init(); 2440fa7d9493SBabu Moger 2441fa7d9493SBabu Moger ret = rdtgroup_create_info_dir(rdtgroup_default.kn); 244223bf1b6bSDavid Howells if (ret < 0) 2443cdb9ebc9SJames Morse goto out_schemata_free; 2444fa7d9493SBabu Moger 2445fa7d9493SBabu Moger if (rdt_mon_capable) { 2446fa7d9493SBabu Moger ret = mongroup_create_dir(rdtgroup_default.kn, 2447334b0f4eSXiaochen Shen &rdtgroup_default, "mon_groups", 2448fa7d9493SBabu Moger &kn_mongrp); 244923bf1b6bSDavid Howells if (ret < 0) 2450fa7d9493SBabu Moger goto out_info; 2451fa7d9493SBabu Moger 2452fa7d9493SBabu Moger ret = mkdir_mondata_all(rdtgroup_default.kn, 2453fa7d9493SBabu Moger &rdtgroup_default, &kn_mondata); 245423bf1b6bSDavid Howells if (ret < 0) 2455fa7d9493SBabu Moger goto out_mongrp; 2456fa7d9493SBabu Moger rdtgroup_default.mon.mon_data_kn = kn_mondata; 2457fa7d9493SBabu Moger } 2458fa7d9493SBabu Moger 2459fa7d9493SBabu Moger ret = rdt_pseudo_lock_init(); 246023bf1b6bSDavid Howells if (ret) 2461fa7d9493SBabu Moger goto out_mondata; 2462fa7d9493SBabu Moger 246323bf1b6bSDavid Howells ret = kernfs_get_tree(fc); 246423bf1b6bSDavid Howells if (ret < 0) 2465fa7d9493SBabu Moger goto out_psl; 2466fa7d9493SBabu Moger 2467fa7d9493SBabu Moger if (rdt_alloc_capable) 2468fa7d9493SBabu Moger static_branch_enable_cpuslocked(&rdt_alloc_enable_key); 2469fa7d9493SBabu Moger if (rdt_mon_capable) 2470fa7d9493SBabu Moger static_branch_enable_cpuslocked(&rdt_mon_enable_key); 2471fa7d9493SBabu Moger 2472fa7d9493SBabu Moger if (rdt_alloc_capable || rdt_mon_capable) 2473fa7d9493SBabu Moger static_branch_enable_cpuslocked(&rdt_enable_key); 2474fa7d9493SBabu Moger 2475fa7d9493SBabu Moger if (is_mbm_enabled()) { 247663c8b123SJames Morse r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl; 2477fa7d9493SBabu Moger list_for_each_entry(dom, &r->domains, list) 2478fa7d9493SBabu Moger mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL); 2479fa7d9493SBabu Moger } 2480fa7d9493SBabu Moger 2481fa7d9493SBabu Moger goto out; 2482fa7d9493SBabu Moger 2483fa7d9493SBabu Moger out_psl: 2484fa7d9493SBabu Moger rdt_pseudo_lock_release(); 2485fa7d9493SBabu Moger out_mondata: 2486fa7d9493SBabu Moger if (rdt_mon_capable) 2487fa7d9493SBabu Moger kernfs_remove(kn_mondata); 2488fa7d9493SBabu Moger out_mongrp: 2489fa7d9493SBabu Moger if (rdt_mon_capable) 2490fa7d9493SBabu Moger kernfs_remove(kn_mongrp); 2491fa7d9493SBabu Moger out_info: 2492fa7d9493SBabu Moger kernfs_remove(kn_info); 2493cdb9ebc9SJames Morse out_schemata_free: 2494cdb9ebc9SJames Morse schemata_list_destroy(); 249523bf1b6bSDavid Howells out_mba: 249623bf1b6bSDavid Howells if (ctx->enable_mba_mbps) 249723bf1b6bSDavid Howells set_mba_sc(false); 2498fa7d9493SBabu Moger out_cdp: 2499fa7d9493SBabu Moger cdp_disable_all(); 2500fa7d9493SBabu Moger out: 2501fa7d9493SBabu Moger rdt_last_cmd_clear(); 2502fa7d9493SBabu Moger mutex_unlock(&rdtgroup_mutex); 2503fa7d9493SBabu Moger cpus_read_unlock(); 250423bf1b6bSDavid Howells return ret; 250523bf1b6bSDavid Howells } 2506fa7d9493SBabu Moger 250723bf1b6bSDavid Howells enum rdt_param { 250823bf1b6bSDavid Howells Opt_cdp, 250923bf1b6bSDavid Howells Opt_cdpl2, 2510faa3604eSXiaochen Shen Opt_mba_mbps, 251123bf1b6bSDavid Howells nr__rdt_params 251223bf1b6bSDavid Howells }; 251323bf1b6bSDavid Howells 2514d7167b14SAl Viro static const struct fs_parameter_spec rdt_fs_parameters[] = { 251523bf1b6bSDavid Howells fsparam_flag("cdp", Opt_cdp), 251623bf1b6bSDavid Howells fsparam_flag("cdpl2", Opt_cdpl2), 2517faa3604eSXiaochen Shen fsparam_flag("mba_MBps", Opt_mba_mbps), 251823bf1b6bSDavid Howells {} 251923bf1b6bSDavid Howells }; 252023bf1b6bSDavid Howells 252123bf1b6bSDavid Howells static int rdt_parse_param(struct fs_context *fc, struct fs_parameter *param) 252223bf1b6bSDavid Howells { 252323bf1b6bSDavid Howells struct rdt_fs_context *ctx = rdt_fc2context(fc); 252423bf1b6bSDavid Howells struct fs_parse_result result; 252523bf1b6bSDavid Howells int opt; 252623bf1b6bSDavid Howells 2527d7167b14SAl Viro opt = fs_parse(fc, rdt_fs_parameters, param, &result); 252823bf1b6bSDavid Howells if (opt < 0) 252923bf1b6bSDavid Howells return opt; 253023bf1b6bSDavid Howells 253123bf1b6bSDavid Howells switch (opt) { 253223bf1b6bSDavid Howells case Opt_cdp: 253323bf1b6bSDavid Howells ctx->enable_cdpl3 = true; 253423bf1b6bSDavid Howells return 0; 253523bf1b6bSDavid Howells case Opt_cdpl2: 253623bf1b6bSDavid Howells ctx->enable_cdpl2 = true; 253723bf1b6bSDavid Howells return 0; 2538faa3604eSXiaochen Shen case Opt_mba_mbps: 2539b045c215SJames Morse if (!supports_mba_mbps()) 254023bf1b6bSDavid Howells return -EINVAL; 254123bf1b6bSDavid Howells ctx->enable_mba_mbps = true; 254223bf1b6bSDavid Howells return 0; 254323bf1b6bSDavid Howells } 254423bf1b6bSDavid Howells 254523bf1b6bSDavid Howells return -EINVAL; 254623bf1b6bSDavid Howells } 254723bf1b6bSDavid Howells 254823bf1b6bSDavid Howells static void rdt_fs_context_free(struct fs_context *fc) 254923bf1b6bSDavid Howells { 255023bf1b6bSDavid Howells struct rdt_fs_context *ctx = rdt_fc2context(fc); 255123bf1b6bSDavid Howells 255223bf1b6bSDavid Howells kernfs_free_fs_context(fc); 255323bf1b6bSDavid Howells kfree(ctx); 255423bf1b6bSDavid Howells } 255523bf1b6bSDavid Howells 255623bf1b6bSDavid Howells static const struct fs_context_operations rdt_fs_context_ops = { 255723bf1b6bSDavid Howells .free = rdt_fs_context_free, 255823bf1b6bSDavid Howells .parse_param = rdt_parse_param, 255923bf1b6bSDavid Howells .get_tree = rdt_get_tree, 256023bf1b6bSDavid Howells }; 256123bf1b6bSDavid Howells 256223bf1b6bSDavid Howells static int rdt_init_fs_context(struct fs_context *fc) 256323bf1b6bSDavid Howells { 256423bf1b6bSDavid Howells struct rdt_fs_context *ctx; 256523bf1b6bSDavid Howells 256623bf1b6bSDavid Howells ctx = kzalloc(sizeof(struct rdt_fs_context), GFP_KERNEL); 256723bf1b6bSDavid Howells if (!ctx) 256823bf1b6bSDavid Howells return -ENOMEM; 256923bf1b6bSDavid Howells 257023bf1b6bSDavid Howells ctx->kfc.root = rdt_root; 257123bf1b6bSDavid Howells ctx->kfc.magic = RDTGROUP_SUPER_MAGIC; 257223bf1b6bSDavid Howells fc->fs_private = &ctx->kfc; 257323bf1b6bSDavid Howells fc->ops = &rdt_fs_context_ops; 257423bf1b6bSDavid Howells put_user_ns(fc->user_ns); 257523bf1b6bSDavid Howells fc->user_ns = get_user_ns(&init_user_ns); 257623bf1b6bSDavid Howells fc->global = true; 257723bf1b6bSDavid Howells return 0; 2578fa7d9493SBabu Moger } 2579fa7d9493SBabu Moger 2580fa7d9493SBabu Moger static int reset_all_ctrls(struct rdt_resource *r) 2581fa7d9493SBabu Moger { 258263c8b123SJames Morse struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r); 2583792e0f6fSJames Morse struct rdt_hw_domain *hw_dom; 2584fa7d9493SBabu Moger struct msr_param msr_param; 2585fa7d9493SBabu Moger cpumask_var_t cpu_mask; 2586fa7d9493SBabu Moger struct rdt_domain *d; 2587fc3b618cSBabu Moger int i; 2588fa7d9493SBabu Moger 2589fa7d9493SBabu Moger if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL)) 2590fa7d9493SBabu Moger return -ENOMEM; 2591fa7d9493SBabu Moger 2592fa7d9493SBabu Moger msr_param.res = r; 2593fa7d9493SBabu Moger msr_param.low = 0; 259463c8b123SJames Morse msr_param.high = hw_res->num_closid; 2595fa7d9493SBabu Moger 2596fa7d9493SBabu Moger /* 2597fa7d9493SBabu Moger * Disable resource control for this resource by setting all 2598fa7d9493SBabu Moger * CBMs in all domains to the maximum mask value. Pick one CPU 2599fa7d9493SBabu Moger * from each domain to update the MSRs below. 2600fa7d9493SBabu Moger */ 2601fa7d9493SBabu Moger list_for_each_entry(d, &r->domains, list) { 2602792e0f6fSJames Morse hw_dom = resctrl_to_arch_dom(d); 2603fa7d9493SBabu Moger cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask); 2604fa7d9493SBabu Moger 2605b58d4eb1SJames Morse for (i = 0; i < hw_res->num_closid; i++) 2606792e0f6fSJames Morse hw_dom->ctrl_val[i] = r->default_ctrl; 2607fa7d9493SBabu Moger } 2608fc3b618cSBabu Moger 2609fc3b618cSBabu Moger /* Update CBM on all the CPUs in cpu_mask */ 2610fc3b618cSBabu Moger on_each_cpu_mask(cpu_mask, rdt_ctrl_update, &msr_param, 1); 2611fa7d9493SBabu Moger 2612fa7d9493SBabu Moger free_cpumask_var(cpu_mask); 2613fa7d9493SBabu Moger 2614fa7d9493SBabu Moger return 0; 2615fa7d9493SBabu Moger } 2616fa7d9493SBabu Moger 2617fa7d9493SBabu Moger /* 2618fa7d9493SBabu Moger * Move tasks from one to the other group. If @from is NULL, then all tasks 2619fa7d9493SBabu Moger * in the systems are moved unconditionally (used for teardown). 2620fa7d9493SBabu Moger * 2621fa7d9493SBabu Moger * If @mask is not NULL the cpus on which moved tasks are running are set 2622fa7d9493SBabu Moger * in that mask so the update smp function call is restricted to affected 2623fa7d9493SBabu Moger * cpus. 2624fa7d9493SBabu Moger */ 2625fa7d9493SBabu Moger static void rdt_move_group_tasks(struct rdtgroup *from, struct rdtgroup *to, 2626fa7d9493SBabu Moger struct cpumask *mask) 2627fa7d9493SBabu Moger { 2628fa7d9493SBabu Moger struct task_struct *p, *t; 2629fa7d9493SBabu Moger 2630fa7d9493SBabu Moger read_lock(&tasklist_lock); 2631fa7d9493SBabu Moger for_each_process_thread(p, t) { 2632fa7d9493SBabu Moger if (!from || is_closid_match(t, from) || 2633fa7d9493SBabu Moger is_rmid_match(t, from)) { 26346d3b47ddSValentin Schneider WRITE_ONCE(t->closid, to->closid); 26356d3b47ddSValentin Schneider WRITE_ONCE(t->rmid, to->mon.rmid); 2636fa7d9493SBabu Moger 2637fa7d9493SBabu Moger /* 2638fe1f0714SPeter Newman * Order the closid/rmid stores above before the loads 2639fe1f0714SPeter Newman * in task_curr(). This pairs with the full barrier 2640fe1f0714SPeter Newman * between the rq->curr update and resctrl_sched_in() 2641fe1f0714SPeter Newman * during context switch. 2642fe1f0714SPeter Newman */ 2643fe1f0714SPeter Newman smp_mb(); 2644fe1f0714SPeter Newman 2645fe1f0714SPeter Newman /* 2646e0ad6dc8SReinette Chatre * If the task is on a CPU, set the CPU in the mask. 2647e0ad6dc8SReinette Chatre * The detection is inaccurate as tasks might move or 2648e0ad6dc8SReinette Chatre * schedule before the smp function call takes place. 2649e0ad6dc8SReinette Chatre * In such a case the function call is pointless, but 2650fa7d9493SBabu Moger * there is no other side effect. 2651fa7d9493SBabu Moger */ 2652e0ad6dc8SReinette Chatre if (IS_ENABLED(CONFIG_SMP) && mask && task_curr(t)) 2653fa7d9493SBabu Moger cpumask_set_cpu(task_cpu(t), mask); 2654fa7d9493SBabu Moger } 2655fa7d9493SBabu Moger } 2656fa7d9493SBabu Moger read_unlock(&tasklist_lock); 2657fa7d9493SBabu Moger } 2658fa7d9493SBabu Moger 2659fa7d9493SBabu Moger static void free_all_child_rdtgrp(struct rdtgroup *rdtgrp) 2660fa7d9493SBabu Moger { 2661fa7d9493SBabu Moger struct rdtgroup *sentry, *stmp; 2662fa7d9493SBabu Moger struct list_head *head; 2663fa7d9493SBabu Moger 2664fa7d9493SBabu Moger head = &rdtgrp->mon.crdtgrp_list; 2665fa7d9493SBabu Moger list_for_each_entry_safe(sentry, stmp, head, mon.crdtgrp_list) { 2666fa7d9493SBabu Moger free_rmid(sentry->mon.rmid); 2667fa7d9493SBabu Moger list_del(&sentry->mon.crdtgrp_list); 2668b8511cccSXiaochen Shen 2669b8511cccSXiaochen Shen if (atomic_read(&sentry->waitcount) != 0) 2670b8511cccSXiaochen Shen sentry->flags = RDT_DELETED; 2671b8511cccSXiaochen Shen else 267275899924SXiaochen Shen rdtgroup_remove(sentry); 2673fa7d9493SBabu Moger } 2674fa7d9493SBabu Moger } 2675fa7d9493SBabu Moger 2676fa7d9493SBabu Moger /* 2677fa7d9493SBabu Moger * Forcibly remove all of subdirectories under root. 2678fa7d9493SBabu Moger */ 2679fa7d9493SBabu Moger static void rmdir_all_sub(void) 2680fa7d9493SBabu Moger { 2681fa7d9493SBabu Moger struct rdtgroup *rdtgrp, *tmp; 2682fa7d9493SBabu Moger 2683fa7d9493SBabu Moger /* Move all tasks to the default resource group */ 2684fa7d9493SBabu Moger rdt_move_group_tasks(NULL, &rdtgroup_default, NULL); 2685fa7d9493SBabu Moger 2686fa7d9493SBabu Moger list_for_each_entry_safe(rdtgrp, tmp, &rdt_all_groups, rdtgroup_list) { 2687fa7d9493SBabu Moger /* Free any child rmids */ 2688fa7d9493SBabu Moger free_all_child_rdtgrp(rdtgrp); 2689fa7d9493SBabu Moger 2690fa7d9493SBabu Moger /* Remove each rdtgroup other than root */ 2691fa7d9493SBabu Moger if (rdtgrp == &rdtgroup_default) 2692fa7d9493SBabu Moger continue; 2693fa7d9493SBabu Moger 2694fa7d9493SBabu Moger if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP || 2695fa7d9493SBabu Moger rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) 2696fa7d9493SBabu Moger rdtgroup_pseudo_lock_remove(rdtgrp); 2697fa7d9493SBabu Moger 2698fa7d9493SBabu Moger /* 2699fa7d9493SBabu Moger * Give any CPUs back to the default group. We cannot copy 2700fa7d9493SBabu Moger * cpu_online_mask because a CPU might have executed the 2701fa7d9493SBabu Moger * offline callback already, but is still marked online. 2702fa7d9493SBabu Moger */ 2703fa7d9493SBabu Moger cpumask_or(&rdtgroup_default.cpu_mask, 2704fa7d9493SBabu Moger &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask); 2705fa7d9493SBabu Moger 2706fa7d9493SBabu Moger free_rmid(rdtgrp->mon.rmid); 2707fa7d9493SBabu Moger 2708fa7d9493SBabu Moger kernfs_remove(rdtgrp->kn); 2709fa7d9493SBabu Moger list_del(&rdtgrp->rdtgroup_list); 2710b8511cccSXiaochen Shen 2711b8511cccSXiaochen Shen if (atomic_read(&rdtgrp->waitcount) != 0) 2712b8511cccSXiaochen Shen rdtgrp->flags = RDT_DELETED; 2713b8511cccSXiaochen Shen else 271475899924SXiaochen Shen rdtgroup_remove(rdtgrp); 2715fa7d9493SBabu Moger } 2716fa7d9493SBabu Moger /* Notify online CPUs to update per cpu storage and PQR_ASSOC MSR */ 2717fa7d9493SBabu Moger update_closid_rmid(cpu_online_mask, &rdtgroup_default); 2718fa7d9493SBabu Moger 2719fa7d9493SBabu Moger kernfs_remove(kn_info); 2720fa7d9493SBabu Moger kernfs_remove(kn_mongrp); 2721fa7d9493SBabu Moger kernfs_remove(kn_mondata); 2722fa7d9493SBabu Moger } 2723fa7d9493SBabu Moger 2724fa7d9493SBabu Moger static void rdt_kill_sb(struct super_block *sb) 2725fa7d9493SBabu Moger { 2726fa7d9493SBabu Moger struct rdt_resource *r; 2727fa7d9493SBabu Moger 2728fa7d9493SBabu Moger cpus_read_lock(); 2729fa7d9493SBabu Moger mutex_lock(&rdtgroup_mutex); 2730fa7d9493SBabu Moger 2731fa7d9493SBabu Moger set_mba_sc(false); 2732fa7d9493SBabu Moger 2733fa7d9493SBabu Moger /*Put everything back to default values. */ 27344d269ed4SJames Morse for_each_alloc_capable_rdt_resource(r) 2735fa7d9493SBabu Moger reset_all_ctrls(r); 2736fa7d9493SBabu Moger cdp_disable_all(); 2737fa7d9493SBabu Moger rmdir_all_sub(); 2738fa7d9493SBabu Moger rdt_pseudo_lock_release(); 2739fa7d9493SBabu Moger rdtgroup_default.mode = RDT_MODE_SHAREABLE; 2740cdb9ebc9SJames Morse schemata_list_destroy(); 2741fa7d9493SBabu Moger static_branch_disable_cpuslocked(&rdt_alloc_enable_key); 2742fa7d9493SBabu Moger static_branch_disable_cpuslocked(&rdt_mon_enable_key); 2743fa7d9493SBabu Moger static_branch_disable_cpuslocked(&rdt_enable_key); 2744fa7d9493SBabu Moger kernfs_kill_sb(sb); 2745fa7d9493SBabu Moger mutex_unlock(&rdtgroup_mutex); 2746fa7d9493SBabu Moger cpus_read_unlock(); 2747fa7d9493SBabu Moger } 2748fa7d9493SBabu Moger 2749fa7d9493SBabu Moger static struct file_system_type rdt_fs_type = { 2750fa7d9493SBabu Moger .name = "resctrl", 275123bf1b6bSDavid Howells .init_fs_context = rdt_init_fs_context, 2752d7167b14SAl Viro .parameters = rdt_fs_parameters, 2753fa7d9493SBabu Moger .kill_sb = rdt_kill_sb, 2754fa7d9493SBabu Moger }; 2755fa7d9493SBabu Moger 2756fa7d9493SBabu Moger static int mon_addfile(struct kernfs_node *parent_kn, const char *name, 2757fa7d9493SBabu Moger void *priv) 2758fa7d9493SBabu Moger { 2759fa7d9493SBabu Moger struct kernfs_node *kn; 2760fa7d9493SBabu Moger int ret = 0; 2761fa7d9493SBabu Moger 2762fa7d9493SBabu Moger kn = __kernfs_create_file(parent_kn, name, 0444, 2763fa7d9493SBabu Moger GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, 0, 2764fa7d9493SBabu Moger &kf_mondata_ops, priv, NULL, NULL); 2765fa7d9493SBabu Moger if (IS_ERR(kn)) 2766fa7d9493SBabu Moger return PTR_ERR(kn); 2767fa7d9493SBabu Moger 2768fa7d9493SBabu Moger ret = rdtgroup_kn_set_ugid(kn); 2769fa7d9493SBabu Moger if (ret) { 2770fa7d9493SBabu Moger kernfs_remove(kn); 2771fa7d9493SBabu Moger return ret; 2772fa7d9493SBabu Moger } 2773fa7d9493SBabu Moger 2774fa7d9493SBabu Moger return ret; 2775fa7d9493SBabu Moger } 2776fa7d9493SBabu Moger 2777fa7d9493SBabu Moger /* 2778fa7d9493SBabu Moger * Remove all subdirectories of mon_data of ctrl_mon groups 2779fa7d9493SBabu Moger * and monitor groups with given domain id. 2780fa7d9493SBabu Moger */ 2781798fd4b9SJames Morse static void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r, 2782798fd4b9SJames Morse unsigned int dom_id) 2783fa7d9493SBabu Moger { 2784fa7d9493SBabu Moger struct rdtgroup *prgrp, *crgrp; 2785fa7d9493SBabu Moger char name[32]; 2786fa7d9493SBabu Moger 2787fa7d9493SBabu Moger list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) { 2788fa7d9493SBabu Moger sprintf(name, "mon_%s_%02d", r->name, dom_id); 2789fa7d9493SBabu Moger kernfs_remove_by_name(prgrp->mon.mon_data_kn, name); 2790fa7d9493SBabu Moger 2791fa7d9493SBabu Moger list_for_each_entry(crgrp, &prgrp->mon.crdtgrp_list, mon.crdtgrp_list) 2792fa7d9493SBabu Moger kernfs_remove_by_name(crgrp->mon.mon_data_kn, name); 2793fa7d9493SBabu Moger } 2794fa7d9493SBabu Moger } 2795fa7d9493SBabu Moger 2796fa7d9493SBabu Moger static int mkdir_mondata_subdir(struct kernfs_node *parent_kn, 2797fa7d9493SBabu Moger struct rdt_domain *d, 2798fa7d9493SBabu Moger struct rdt_resource *r, struct rdtgroup *prgrp) 2799fa7d9493SBabu Moger { 2800fa7d9493SBabu Moger union mon_data_bits priv; 2801fa7d9493SBabu Moger struct kernfs_node *kn; 2802fa7d9493SBabu Moger struct mon_evt *mevt; 2803fa7d9493SBabu Moger struct rmid_read rr; 2804fa7d9493SBabu Moger char name[32]; 2805fa7d9493SBabu Moger int ret; 2806fa7d9493SBabu Moger 2807fa7d9493SBabu Moger sprintf(name, "mon_%s_%02d", r->name, d->id); 2808fa7d9493SBabu Moger /* create the directory */ 2809fa7d9493SBabu Moger kn = kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp); 2810fa7d9493SBabu Moger if (IS_ERR(kn)) 2811fa7d9493SBabu Moger return PTR_ERR(kn); 2812fa7d9493SBabu Moger 2813fa7d9493SBabu Moger ret = rdtgroup_kn_set_ugid(kn); 2814fa7d9493SBabu Moger if (ret) 2815fa7d9493SBabu Moger goto out_destroy; 2816fa7d9493SBabu Moger 2817fa7d9493SBabu Moger if (WARN_ON(list_empty(&r->evt_list))) { 2818fa7d9493SBabu Moger ret = -EPERM; 2819fa7d9493SBabu Moger goto out_destroy; 2820fa7d9493SBabu Moger } 2821fa7d9493SBabu Moger 2822fa7d9493SBabu Moger priv.u.rid = r->rid; 2823fa7d9493SBabu Moger priv.u.domid = d->id; 2824fa7d9493SBabu Moger list_for_each_entry(mevt, &r->evt_list, list) { 2825fa7d9493SBabu Moger priv.u.evtid = mevt->evtid; 2826fa7d9493SBabu Moger ret = mon_addfile(kn, mevt->name, priv.priv); 2827fa7d9493SBabu Moger if (ret) 2828fa7d9493SBabu Moger goto out_destroy; 2829fa7d9493SBabu Moger 2830fa7d9493SBabu Moger if (is_mbm_event(mevt->evtid)) 283146637d45SReinette Chatre mon_event_read(&rr, r, d, prgrp, mevt->evtid, true); 2832fa7d9493SBabu Moger } 2833fa7d9493SBabu Moger kernfs_activate(kn); 2834fa7d9493SBabu Moger return 0; 2835fa7d9493SBabu Moger 2836fa7d9493SBabu Moger out_destroy: 2837fa7d9493SBabu Moger kernfs_remove(kn); 2838fa7d9493SBabu Moger return ret; 2839fa7d9493SBabu Moger } 2840fa7d9493SBabu Moger 2841fa7d9493SBabu Moger /* 2842fa7d9493SBabu Moger * Add all subdirectories of mon_data for "ctrl_mon" groups 2843fa7d9493SBabu Moger * and "monitor" groups with given domain id. 2844fa7d9493SBabu Moger */ 28453a7232cdSJames Morse static void mkdir_mondata_subdir_allrdtgrp(struct rdt_resource *r, 2846fa7d9493SBabu Moger struct rdt_domain *d) 2847fa7d9493SBabu Moger { 2848fa7d9493SBabu Moger struct kernfs_node *parent_kn; 2849fa7d9493SBabu Moger struct rdtgroup *prgrp, *crgrp; 2850fa7d9493SBabu Moger struct list_head *head; 2851fa7d9493SBabu Moger 2852fa7d9493SBabu Moger list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) { 2853fa7d9493SBabu Moger parent_kn = prgrp->mon.mon_data_kn; 2854fa7d9493SBabu Moger mkdir_mondata_subdir(parent_kn, d, r, prgrp); 2855fa7d9493SBabu Moger 2856fa7d9493SBabu Moger head = &prgrp->mon.crdtgrp_list; 2857fa7d9493SBabu Moger list_for_each_entry(crgrp, head, mon.crdtgrp_list) { 2858fa7d9493SBabu Moger parent_kn = crgrp->mon.mon_data_kn; 2859fa7d9493SBabu Moger mkdir_mondata_subdir(parent_kn, d, r, crgrp); 2860fa7d9493SBabu Moger } 2861fa7d9493SBabu Moger } 2862fa7d9493SBabu Moger } 2863fa7d9493SBabu Moger 2864fa7d9493SBabu Moger static int mkdir_mondata_subdir_alldom(struct kernfs_node *parent_kn, 2865fa7d9493SBabu Moger struct rdt_resource *r, 2866fa7d9493SBabu Moger struct rdtgroup *prgrp) 2867fa7d9493SBabu Moger { 2868fa7d9493SBabu Moger struct rdt_domain *dom; 2869fa7d9493SBabu Moger int ret; 2870fa7d9493SBabu Moger 2871fa7d9493SBabu Moger list_for_each_entry(dom, &r->domains, list) { 2872fa7d9493SBabu Moger ret = mkdir_mondata_subdir(parent_kn, dom, r, prgrp); 2873fa7d9493SBabu Moger if (ret) 2874fa7d9493SBabu Moger return ret; 2875fa7d9493SBabu Moger } 2876fa7d9493SBabu Moger 2877fa7d9493SBabu Moger return 0; 2878fa7d9493SBabu Moger } 2879fa7d9493SBabu Moger 2880fa7d9493SBabu Moger /* 2881fa7d9493SBabu Moger * This creates a directory mon_data which contains the monitored data. 2882fa7d9493SBabu Moger * 2883163b0991SIngo Molnar * mon_data has one directory for each domain which are named 2884fa7d9493SBabu Moger * in the format mon_<domain_name>_<domain_id>. For ex: A mon_data 2885fa7d9493SBabu Moger * with L3 domain looks as below: 2886fa7d9493SBabu Moger * ./mon_data: 2887fa7d9493SBabu Moger * mon_L3_00 2888fa7d9493SBabu Moger * mon_L3_01 2889fa7d9493SBabu Moger * mon_L3_02 2890fa7d9493SBabu Moger * ... 2891fa7d9493SBabu Moger * 2892fa7d9493SBabu Moger * Each domain directory has one file per event: 2893fa7d9493SBabu Moger * ./mon_L3_00/: 2894fa7d9493SBabu Moger * llc_occupancy 2895fa7d9493SBabu Moger * 2896fa7d9493SBabu Moger */ 2897fa7d9493SBabu Moger static int mkdir_mondata_all(struct kernfs_node *parent_kn, 2898fa7d9493SBabu Moger struct rdtgroup *prgrp, 2899fa7d9493SBabu Moger struct kernfs_node **dest_kn) 2900fa7d9493SBabu Moger { 2901fa7d9493SBabu Moger struct rdt_resource *r; 2902fa7d9493SBabu Moger struct kernfs_node *kn; 2903fa7d9493SBabu Moger int ret; 2904fa7d9493SBabu Moger 2905fa7d9493SBabu Moger /* 2906fa7d9493SBabu Moger * Create the mon_data directory first. 2907fa7d9493SBabu Moger */ 2908334b0f4eSXiaochen Shen ret = mongroup_create_dir(parent_kn, prgrp, "mon_data", &kn); 2909fa7d9493SBabu Moger if (ret) 2910fa7d9493SBabu Moger return ret; 2911fa7d9493SBabu Moger 2912fa7d9493SBabu Moger if (dest_kn) 2913fa7d9493SBabu Moger *dest_kn = kn; 2914fa7d9493SBabu Moger 2915fa7d9493SBabu Moger /* 2916fa7d9493SBabu Moger * Create the subdirectories for each domain. Note that all events 2917fa7d9493SBabu Moger * in a domain like L3 are grouped into a resource whose domain is L3 2918fa7d9493SBabu Moger */ 2919bab6ee73SJames Morse for_each_mon_capable_rdt_resource(r) { 2920fa7d9493SBabu Moger ret = mkdir_mondata_subdir_alldom(kn, r, prgrp); 2921fa7d9493SBabu Moger if (ret) 2922fa7d9493SBabu Moger goto out_destroy; 2923fa7d9493SBabu Moger } 2924fa7d9493SBabu Moger 2925fa7d9493SBabu Moger return 0; 2926fa7d9493SBabu Moger 2927fa7d9493SBabu Moger out_destroy: 2928fa7d9493SBabu Moger kernfs_remove(kn); 2929fa7d9493SBabu Moger return ret; 2930fa7d9493SBabu Moger } 2931fa7d9493SBabu Moger 2932fa7d9493SBabu Moger /** 2933fa7d9493SBabu Moger * cbm_ensure_valid - Enforce validity on provided CBM 2934fa7d9493SBabu Moger * @_val: Candidate CBM 2935fa7d9493SBabu Moger * @r: RDT resource to which the CBM belongs 2936fa7d9493SBabu Moger * 2937fa7d9493SBabu Moger * The provided CBM represents all cache portions available for use. This 2938fa7d9493SBabu Moger * may be represented by a bitmap that does not consist of contiguous ones 2939fa7d9493SBabu Moger * and thus be an invalid CBM. 2940fa7d9493SBabu Moger * Here the provided CBM is forced to be a valid CBM by only considering 2941fa7d9493SBabu Moger * the first set of contiguous bits as valid and clearing all bits. 2942fa7d9493SBabu Moger * The intention here is to provide a valid default CBM with which a new 2943fa7d9493SBabu Moger * resource group is initialized. The user can follow this with a 2944fa7d9493SBabu Moger * modification to the CBM if the default does not satisfy the 2945fa7d9493SBabu Moger * requirements. 2946fa7d9493SBabu Moger */ 29472ef085bdSReinette Chatre static u32 cbm_ensure_valid(u32 _val, struct rdt_resource *r) 2948fa7d9493SBabu Moger { 2949fa7d9493SBabu Moger unsigned int cbm_len = r->cache.cbm_len; 2950fa7d9493SBabu Moger unsigned long first_bit, zero_bit; 29512ef085bdSReinette Chatre unsigned long val = _val; 2952fa7d9493SBabu Moger 29532ef085bdSReinette Chatre if (!val) 29542ef085bdSReinette Chatre return 0; 2955fa7d9493SBabu Moger 295632f010deSReinette Chatre first_bit = find_first_bit(&val, cbm_len); 295732f010deSReinette Chatre zero_bit = find_next_zero_bit(&val, cbm_len, first_bit); 2958fa7d9493SBabu Moger 2959fa7d9493SBabu Moger /* Clear any remaining bits to ensure contiguous region */ 296032f010deSReinette Chatre bitmap_clear(&val, zero_bit, cbm_len - zero_bit); 29612ef085bdSReinette Chatre return (u32)val; 2962fa7d9493SBabu Moger } 2963fa7d9493SBabu Moger 29647390619aSXiaochen Shen /* 29657390619aSXiaochen Shen * Initialize cache resources per RDT domain 2966fa7d9493SBabu Moger * 29677390619aSXiaochen Shen * Set the RDT domain up to start off with all usable allocations. That is, 29687390619aSXiaochen Shen * all shareable and unused bits. All-zero CBM is invalid. 2969fa7d9493SBabu Moger */ 29701c290682SJames Morse static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s, 29717390619aSXiaochen Shen u32 closid) 2972fa7d9493SBabu Moger { 2973fbc06c69SJames Morse enum resctrl_conf_type peer_type = resctrl_peer_type(s->conf_type); 297475408e43SJames Morse enum resctrl_conf_type t = s->conf_type; 2975e8f72825SJames Morse struct resctrl_staged_config *cfg; 29761c290682SJames Morse struct rdt_resource *r = s->res; 2977fa7d9493SBabu Moger u32 used_b = 0, unused_b = 0; 2978fa7d9493SBabu Moger unsigned long tmp_cbm; 2979fa7d9493SBabu Moger enum rdtgrp_mode mode; 2980f07e9d02SJames Morse u32 peer_ctl, ctrl_val; 29817390619aSXiaochen Shen int i; 2982fa7d9493SBabu Moger 298375408e43SJames Morse cfg = &d->staged_config[t]; 2984e8f72825SJames Morse cfg->have_new_ctrl = false; 2985e8f72825SJames Morse cfg->new_ctrl = r->cache.shareable_bits; 2986fa7d9493SBabu Moger used_b = r->cache.shareable_bits; 2987f07e9d02SJames Morse for (i = 0; i < closids_supported(); i++) { 2988fa7d9493SBabu Moger if (closid_allocated(i) && i != closid) { 2989fa7d9493SBabu Moger mode = rdtgroup_mode_by_closid(i); 2990fa7d9493SBabu Moger if (mode == RDT_MODE_PSEUDO_LOCKSETUP) 299187d3aa28SJames Morse /* 299287d3aa28SJames Morse * ctrl values for locksetup aren't relevant 299387d3aa28SJames Morse * until the schemata is written, and the mode 299487d3aa28SJames Morse * becomes RDT_MODE_PSEUDO_LOCKED. 299587d3aa28SJames Morse */ 299687d3aa28SJames Morse continue; 2997fa7d9493SBabu Moger /* 29987390619aSXiaochen Shen * If CDP is active include peer domain's 29997390619aSXiaochen Shen * usage to ensure there is no overlap 30007390619aSXiaochen Shen * with an exclusive group. 3001fa7d9493SBabu Moger */ 3002fbc06c69SJames Morse if (resctrl_arch_get_cdp_enabled(r->rid)) 3003111136e6SJames Morse peer_ctl = resctrl_arch_get_config(r, d, i, 3004111136e6SJames Morse peer_type); 3005fa7d9493SBabu Moger else 3006fa7d9493SBabu Moger peer_ctl = 0; 3007111136e6SJames Morse ctrl_val = resctrl_arch_get_config(r, d, i, 3008111136e6SJames Morse s->conf_type); 3009f07e9d02SJames Morse used_b |= ctrl_val | peer_ctl; 3010fa7d9493SBabu Moger if (mode == RDT_MODE_SHAREABLE) 3011f07e9d02SJames Morse cfg->new_ctrl |= ctrl_val | peer_ctl; 3012fa7d9493SBabu Moger } 3013fa7d9493SBabu Moger } 3014fa7d9493SBabu Moger if (d->plr && d->plr->cbm > 0) 3015fa7d9493SBabu Moger used_b |= d->plr->cbm; 3016fa7d9493SBabu Moger unused_b = used_b ^ (BIT_MASK(r->cache.cbm_len) - 1); 3017fa7d9493SBabu Moger unused_b &= BIT_MASK(r->cache.cbm_len) - 1; 3018e8f72825SJames Morse cfg->new_ctrl |= unused_b; 3019fa7d9493SBabu Moger /* 3020fa7d9493SBabu Moger * Force the initial CBM to be valid, user can 3021fa7d9493SBabu Moger * modify the CBM based on system availability. 3022fa7d9493SBabu Moger */ 3023e8f72825SJames Morse cfg->new_ctrl = cbm_ensure_valid(cfg->new_ctrl, r); 3024fa7d9493SBabu Moger /* 30257390619aSXiaochen Shen * Assign the u32 CBM to an unsigned long to ensure that 30267390619aSXiaochen Shen * bitmap_weight() does not access out-of-bound memory. 3027fa7d9493SBabu Moger */ 3028e8f72825SJames Morse tmp_cbm = cfg->new_ctrl; 30297390619aSXiaochen Shen if (bitmap_weight(&tmp_cbm, r->cache.cbm_len) < r->cache.min_cbm_bits) { 3030e198fde3SJames Morse rdt_last_cmd_printf("No space on %s:%d\n", s->name, d->id); 3031fa7d9493SBabu Moger return -ENOSPC; 3032fa7d9493SBabu Moger } 3033e8f72825SJames Morse cfg->have_new_ctrl = true; 30347390619aSXiaochen Shen 30357390619aSXiaochen Shen return 0; 30367390619aSXiaochen Shen } 30377390619aSXiaochen Shen 303847820e73SXiaochen Shen /* 303947820e73SXiaochen Shen * Initialize cache resources with default values. 30407390619aSXiaochen Shen * 30417390619aSXiaochen Shen * A new RDT group is being created on an allocation capable (CAT) 30427390619aSXiaochen Shen * supporting system. Set this group up to start off with all usable 30437390619aSXiaochen Shen * allocations. 30447390619aSXiaochen Shen * 30457390619aSXiaochen Shen * If there are no more shareable bits available on any domain then 30467390619aSXiaochen Shen * the entire allocation will fail. 30477390619aSXiaochen Shen */ 30481c290682SJames Morse static int rdtgroup_init_cat(struct resctrl_schema *s, u32 closid) 30497390619aSXiaochen Shen { 30507390619aSXiaochen Shen struct rdt_domain *d; 30517390619aSXiaochen Shen int ret; 30527390619aSXiaochen Shen 30531c290682SJames Morse list_for_each_entry(d, &s->res->domains, list) { 30541c290682SJames Morse ret = __init_one_rdt_domain(d, s, closid); 30557390619aSXiaochen Shen if (ret < 0) 30567390619aSXiaochen Shen return ret; 3057fa7d9493SBabu Moger } 305847820e73SXiaochen Shen 305947820e73SXiaochen Shen return 0; 3060fa7d9493SBabu Moger } 3061fa7d9493SBabu Moger 306247820e73SXiaochen Shen /* Initialize MBA resource with default values. */ 30636ce1560dSJames Morse static void rdtgroup_init_mba(struct rdt_resource *r, u32 closid) 306447820e73SXiaochen Shen { 3065e8f72825SJames Morse struct resctrl_staged_config *cfg; 306647820e73SXiaochen Shen struct rdt_domain *d; 306747820e73SXiaochen Shen 306847820e73SXiaochen Shen list_for_each_entry(d, &r->domains, list) { 30696ce1560dSJames Morse if (is_mba_sc(r)) { 30706ce1560dSJames Morse d->mbps_val[closid] = MBA_MAX_MBPS; 30716ce1560dSJames Morse continue; 30726ce1560dSJames Morse } 30736ce1560dSJames Morse 307475408e43SJames Morse cfg = &d->staged_config[CDP_NONE]; 30756ce1560dSJames Morse cfg->new_ctrl = r->default_ctrl; 3076e8f72825SJames Morse cfg->have_new_ctrl = true; 307747820e73SXiaochen Shen } 307847820e73SXiaochen Shen } 307947820e73SXiaochen Shen 308047820e73SXiaochen Shen /* Initialize the RDT group's allocations. */ 308147820e73SXiaochen Shen static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp) 308247820e73SXiaochen Shen { 3083331ebe4cSJames Morse struct resctrl_schema *s; 308447820e73SXiaochen Shen struct rdt_resource *r; 308547820e73SXiaochen Shen int ret; 308647820e73SXiaochen Shen 3087331ebe4cSJames Morse list_for_each_entry(s, &resctrl_schema_all, list) { 3088331ebe4cSJames Morse r = s->res; 30895b6fac3fSBabu Moger if (r->rid == RDT_RESOURCE_MBA || 30905b6fac3fSBabu Moger r->rid == RDT_RESOURCE_SMBA) { 30916ce1560dSJames Morse rdtgroup_init_mba(r, rdtgrp->closid); 30926ce1560dSJames Morse if (is_mba_sc(r)) 30936ce1560dSJames Morse continue; 309447820e73SXiaochen Shen } else { 30951c290682SJames Morse ret = rdtgroup_init_cat(s, rdtgrp->closid); 309647820e73SXiaochen Shen if (ret < 0) 309747820e73SXiaochen Shen return ret; 309847820e73SXiaochen Shen } 309947820e73SXiaochen Shen 31002e667819SJames Morse ret = resctrl_arch_update_domains(r, rdtgrp->closid); 3101fa7d9493SBabu Moger if (ret < 0) { 3102723f1a0dSBabu Moger rdt_last_cmd_puts("Failed to initialize allocations\n"); 3103fa7d9493SBabu Moger return ret; 3104fa7d9493SBabu Moger } 310547820e73SXiaochen Shen 3106fa7d9493SBabu Moger } 3107fa7d9493SBabu Moger 310840fba00fSXiaochen Shen rdtgrp->mode = RDT_MODE_SHAREABLE; 310940fba00fSXiaochen Shen 3110fa7d9493SBabu Moger return 0; 3111fa7d9493SBabu Moger } 3112fa7d9493SBabu Moger 3113fa7d9493SBabu Moger static int mkdir_rdt_prepare(struct kernfs_node *parent_kn, 3114fa7d9493SBabu Moger const char *name, umode_t mode, 3115fa7d9493SBabu Moger enum rdt_group_type rtype, struct rdtgroup **r) 3116fa7d9493SBabu Moger { 3117fa7d9493SBabu Moger struct rdtgroup *prdtgrp, *rdtgrp; 3118fa7d9493SBabu Moger struct kernfs_node *kn; 3119fa7d9493SBabu Moger uint files = 0; 3120fa7d9493SBabu Moger int ret; 3121fa7d9493SBabu Moger 3122334b0f4eSXiaochen Shen prdtgrp = rdtgroup_kn_lock_live(parent_kn); 3123fa7d9493SBabu Moger if (!prdtgrp) { 3124fa7d9493SBabu Moger ret = -ENODEV; 3125fa7d9493SBabu Moger goto out_unlock; 3126fa7d9493SBabu Moger } 3127fa7d9493SBabu Moger 3128fa7d9493SBabu Moger if (rtype == RDTMON_GROUP && 3129fa7d9493SBabu Moger (prdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP || 3130fa7d9493SBabu Moger prdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)) { 3131fa7d9493SBabu Moger ret = -EINVAL; 3132723f1a0dSBabu Moger rdt_last_cmd_puts("Pseudo-locking in progress\n"); 3133fa7d9493SBabu Moger goto out_unlock; 3134fa7d9493SBabu Moger } 3135fa7d9493SBabu Moger 3136fa7d9493SBabu Moger /* allocate the rdtgroup. */ 3137fa7d9493SBabu Moger rdtgrp = kzalloc(sizeof(*rdtgrp), GFP_KERNEL); 3138fa7d9493SBabu Moger if (!rdtgrp) { 3139fa7d9493SBabu Moger ret = -ENOSPC; 3140723f1a0dSBabu Moger rdt_last_cmd_puts("Kernel out of memory\n"); 3141fa7d9493SBabu Moger goto out_unlock; 3142fa7d9493SBabu Moger } 3143fa7d9493SBabu Moger *r = rdtgrp; 3144fa7d9493SBabu Moger rdtgrp->mon.parent = prdtgrp; 3145fa7d9493SBabu Moger rdtgrp->type = rtype; 3146fa7d9493SBabu Moger INIT_LIST_HEAD(&rdtgrp->mon.crdtgrp_list); 3147fa7d9493SBabu Moger 3148fa7d9493SBabu Moger /* kernfs creates the directory for rdtgrp */ 3149fa7d9493SBabu Moger kn = kernfs_create_dir(parent_kn, name, mode, rdtgrp); 3150fa7d9493SBabu Moger if (IS_ERR(kn)) { 3151fa7d9493SBabu Moger ret = PTR_ERR(kn); 3152fa7d9493SBabu Moger rdt_last_cmd_puts("kernfs create error\n"); 3153fa7d9493SBabu Moger goto out_free_rgrp; 3154fa7d9493SBabu Moger } 3155fa7d9493SBabu Moger rdtgrp->kn = kn; 3156fa7d9493SBabu Moger 3157fa7d9493SBabu Moger /* 3158fa7d9493SBabu Moger * kernfs_remove() will drop the reference count on "kn" which 3159fa7d9493SBabu Moger * will free it. But we still need it to stick around for the 3160fd8d9db3SXiaochen Shen * rdtgroup_kn_unlock(kn) call. Take one extra reference here, 316175899924SXiaochen Shen * which will be dropped by kernfs_put() in rdtgroup_remove(). 3162fa7d9493SBabu Moger */ 3163fa7d9493SBabu Moger kernfs_get(kn); 3164fa7d9493SBabu Moger 3165fa7d9493SBabu Moger ret = rdtgroup_kn_set_ugid(kn); 3166fa7d9493SBabu Moger if (ret) { 3167fa7d9493SBabu Moger rdt_last_cmd_puts("kernfs perm error\n"); 3168fa7d9493SBabu Moger goto out_destroy; 3169fa7d9493SBabu Moger } 3170fa7d9493SBabu Moger 3171fa7d9493SBabu Moger files = RFTYPE_BASE | BIT(RF_CTRLSHIFT + rtype); 3172fa7d9493SBabu Moger ret = rdtgroup_add_files(kn, files); 3173fa7d9493SBabu Moger if (ret) { 3174fa7d9493SBabu Moger rdt_last_cmd_puts("kernfs fill error\n"); 3175fa7d9493SBabu Moger goto out_destroy; 3176fa7d9493SBabu Moger } 3177fa7d9493SBabu Moger 3178fa7d9493SBabu Moger if (rdt_mon_capable) { 3179fa7d9493SBabu Moger ret = alloc_rmid(); 3180fa7d9493SBabu Moger if (ret < 0) { 3181723f1a0dSBabu Moger rdt_last_cmd_puts("Out of RMIDs\n"); 3182fa7d9493SBabu Moger goto out_destroy; 3183fa7d9493SBabu Moger } 3184fa7d9493SBabu Moger rdtgrp->mon.rmid = ret; 3185fa7d9493SBabu Moger 3186fa7d9493SBabu Moger ret = mkdir_mondata_all(kn, rdtgrp, &rdtgrp->mon.mon_data_kn); 3187fa7d9493SBabu Moger if (ret) { 3188fa7d9493SBabu Moger rdt_last_cmd_puts("kernfs subdir error\n"); 3189fa7d9493SBabu Moger goto out_idfree; 3190fa7d9493SBabu Moger } 3191fa7d9493SBabu Moger } 3192fa7d9493SBabu Moger kernfs_activate(kn); 3193fa7d9493SBabu Moger 3194fa7d9493SBabu Moger /* 3195334b0f4eSXiaochen Shen * The caller unlocks the parent_kn upon success. 3196fa7d9493SBabu Moger */ 3197fa7d9493SBabu Moger return 0; 3198fa7d9493SBabu Moger 3199fa7d9493SBabu Moger out_idfree: 3200fa7d9493SBabu Moger free_rmid(rdtgrp->mon.rmid); 3201fa7d9493SBabu Moger out_destroy: 320275899924SXiaochen Shen kernfs_put(rdtgrp->kn); 3203fa7d9493SBabu Moger kernfs_remove(rdtgrp->kn); 3204fa7d9493SBabu Moger out_free_rgrp: 3205fa7d9493SBabu Moger kfree(rdtgrp); 3206fa7d9493SBabu Moger out_unlock: 3207334b0f4eSXiaochen Shen rdtgroup_kn_unlock(parent_kn); 3208fa7d9493SBabu Moger return ret; 3209fa7d9493SBabu Moger } 3210fa7d9493SBabu Moger 3211fa7d9493SBabu Moger static void mkdir_rdt_prepare_clean(struct rdtgroup *rgrp) 3212fa7d9493SBabu Moger { 3213fa7d9493SBabu Moger kernfs_remove(rgrp->kn); 3214fa7d9493SBabu Moger free_rmid(rgrp->mon.rmid); 321575899924SXiaochen Shen rdtgroup_remove(rgrp); 3216fa7d9493SBabu Moger } 3217fa7d9493SBabu Moger 3218fa7d9493SBabu Moger /* 3219fa7d9493SBabu Moger * Create a monitor group under "mon_groups" directory of a control 3220fa7d9493SBabu Moger * and monitor group(ctrl_mon). This is a resource group 3221fa7d9493SBabu Moger * to monitor a subset of tasks and cpus in its parent ctrl_mon group. 3222fa7d9493SBabu Moger */ 3223fa7d9493SBabu Moger static int rdtgroup_mkdir_mon(struct kernfs_node *parent_kn, 322432ada3b9SXiaochen Shen const char *name, umode_t mode) 3225fa7d9493SBabu Moger { 3226fa7d9493SBabu Moger struct rdtgroup *rdtgrp, *prgrp; 3227fa7d9493SBabu Moger int ret; 3228fa7d9493SBabu Moger 322932ada3b9SXiaochen Shen ret = mkdir_rdt_prepare(parent_kn, name, mode, RDTMON_GROUP, &rdtgrp); 3230fa7d9493SBabu Moger if (ret) 3231fa7d9493SBabu Moger return ret; 3232fa7d9493SBabu Moger 3233fa7d9493SBabu Moger prgrp = rdtgrp->mon.parent; 3234fa7d9493SBabu Moger rdtgrp->closid = prgrp->closid; 3235fa7d9493SBabu Moger 3236fa7d9493SBabu Moger /* 3237fa7d9493SBabu Moger * Add the rdtgrp to the list of rdtgrps the parent 3238fa7d9493SBabu Moger * ctrl_mon group has to track. 3239fa7d9493SBabu Moger */ 3240fa7d9493SBabu Moger list_add_tail(&rdtgrp->mon.crdtgrp_list, &prgrp->mon.crdtgrp_list); 3241fa7d9493SBabu Moger 3242334b0f4eSXiaochen Shen rdtgroup_kn_unlock(parent_kn); 3243fa7d9493SBabu Moger return ret; 3244fa7d9493SBabu Moger } 3245fa7d9493SBabu Moger 3246fa7d9493SBabu Moger /* 3247fa7d9493SBabu Moger * These are rdtgroups created under the root directory. Can be used 3248fa7d9493SBabu Moger * to allocate and monitor resources. 3249fa7d9493SBabu Moger */ 3250fa7d9493SBabu Moger static int rdtgroup_mkdir_ctrl_mon(struct kernfs_node *parent_kn, 3251fa7d9493SBabu Moger const char *name, umode_t mode) 3252fa7d9493SBabu Moger { 3253fa7d9493SBabu Moger struct rdtgroup *rdtgrp; 3254fa7d9493SBabu Moger struct kernfs_node *kn; 3255fa7d9493SBabu Moger u32 closid; 3256fa7d9493SBabu Moger int ret; 3257fa7d9493SBabu Moger 325832ada3b9SXiaochen Shen ret = mkdir_rdt_prepare(parent_kn, name, mode, RDTCTRL_GROUP, &rdtgrp); 3259fa7d9493SBabu Moger if (ret) 3260fa7d9493SBabu Moger return ret; 3261fa7d9493SBabu Moger 3262fa7d9493SBabu Moger kn = rdtgrp->kn; 3263fa7d9493SBabu Moger ret = closid_alloc(); 3264fa7d9493SBabu Moger if (ret < 0) { 3265723f1a0dSBabu Moger rdt_last_cmd_puts("Out of CLOSIDs\n"); 3266fa7d9493SBabu Moger goto out_common_fail; 3267fa7d9493SBabu Moger } 3268fa7d9493SBabu Moger closid = ret; 3269fa7d9493SBabu Moger ret = 0; 3270fa7d9493SBabu Moger 3271fa7d9493SBabu Moger rdtgrp->closid = closid; 3272fa7d9493SBabu Moger ret = rdtgroup_init_alloc(rdtgrp); 3273fa7d9493SBabu Moger if (ret < 0) 3274fa7d9493SBabu Moger goto out_id_free; 3275fa7d9493SBabu Moger 3276fa7d9493SBabu Moger list_add(&rdtgrp->rdtgroup_list, &rdt_all_groups); 3277fa7d9493SBabu Moger 3278fa7d9493SBabu Moger if (rdt_mon_capable) { 3279fa7d9493SBabu Moger /* 3280fa7d9493SBabu Moger * Create an empty mon_groups directory to hold the subset 3281fa7d9493SBabu Moger * of tasks and cpus to monitor. 3282fa7d9493SBabu Moger */ 3283334b0f4eSXiaochen Shen ret = mongroup_create_dir(kn, rdtgrp, "mon_groups", NULL); 3284fa7d9493SBabu Moger if (ret) { 3285fa7d9493SBabu Moger rdt_last_cmd_puts("kernfs subdir error\n"); 3286fa7d9493SBabu Moger goto out_del_list; 3287fa7d9493SBabu Moger } 3288fa7d9493SBabu Moger } 3289fa7d9493SBabu Moger 3290fa7d9493SBabu Moger goto out_unlock; 3291fa7d9493SBabu Moger 3292fa7d9493SBabu Moger out_del_list: 3293fa7d9493SBabu Moger list_del(&rdtgrp->rdtgroup_list); 3294fa7d9493SBabu Moger out_id_free: 3295fa7d9493SBabu Moger closid_free(closid); 3296fa7d9493SBabu Moger out_common_fail: 3297fa7d9493SBabu Moger mkdir_rdt_prepare_clean(rdtgrp); 3298fa7d9493SBabu Moger out_unlock: 3299334b0f4eSXiaochen Shen rdtgroup_kn_unlock(parent_kn); 3300fa7d9493SBabu Moger return ret; 3301fa7d9493SBabu Moger } 3302fa7d9493SBabu Moger 3303fa7d9493SBabu Moger /* 3304fa7d9493SBabu Moger * We allow creating mon groups only with in a directory called "mon_groups" 3305fa7d9493SBabu Moger * which is present in every ctrl_mon group. Check if this is a valid 3306fa7d9493SBabu Moger * "mon_groups" directory. 3307fa7d9493SBabu Moger * 3308fa7d9493SBabu Moger * 1. The directory should be named "mon_groups". 3309fa7d9493SBabu Moger * 2. The mon group itself should "not" be named "mon_groups". 3310fa7d9493SBabu Moger * This makes sure "mon_groups" directory always has a ctrl_mon group 3311fa7d9493SBabu Moger * as parent. 3312fa7d9493SBabu Moger */ 3313fa7d9493SBabu Moger static bool is_mon_groups(struct kernfs_node *kn, const char *name) 3314fa7d9493SBabu Moger { 3315fa7d9493SBabu Moger return (!strcmp(kn->name, "mon_groups") && 3316fa7d9493SBabu Moger strcmp(name, "mon_groups")); 3317fa7d9493SBabu Moger } 3318fa7d9493SBabu Moger 3319fa7d9493SBabu Moger static int rdtgroup_mkdir(struct kernfs_node *parent_kn, const char *name, 3320fa7d9493SBabu Moger umode_t mode) 3321fa7d9493SBabu Moger { 3322fa7d9493SBabu Moger /* Do not accept '\n' to avoid unparsable situation. */ 3323fa7d9493SBabu Moger if (strchr(name, '\n')) 3324fa7d9493SBabu Moger return -EINVAL; 3325fa7d9493SBabu Moger 3326fa7d9493SBabu Moger /* 3327fa7d9493SBabu Moger * If the parent directory is the root directory and RDT 3328fa7d9493SBabu Moger * allocation is supported, add a control and monitoring 3329fa7d9493SBabu Moger * subdirectory 3330fa7d9493SBabu Moger */ 3331fa7d9493SBabu Moger if (rdt_alloc_capable && parent_kn == rdtgroup_default.kn) 333232ada3b9SXiaochen Shen return rdtgroup_mkdir_ctrl_mon(parent_kn, name, mode); 3333fa7d9493SBabu Moger 3334fa7d9493SBabu Moger /* 3335fa7d9493SBabu Moger * If RDT monitoring is supported and the parent directory is a valid 3336fa7d9493SBabu Moger * "mon_groups" directory, add a monitoring subdirectory. 3337fa7d9493SBabu Moger */ 3338fa7d9493SBabu Moger if (rdt_mon_capable && is_mon_groups(parent_kn, name)) 333932ada3b9SXiaochen Shen return rdtgroup_mkdir_mon(parent_kn, name, mode); 3340fa7d9493SBabu Moger 3341fa7d9493SBabu Moger return -EPERM; 3342fa7d9493SBabu Moger } 3343fa7d9493SBabu Moger 334419eb86a7SXiaochen Shen static int rdtgroup_rmdir_mon(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask) 3345fa7d9493SBabu Moger { 3346fa7d9493SBabu Moger struct rdtgroup *prdtgrp = rdtgrp->mon.parent; 3347fa7d9493SBabu Moger int cpu; 3348fa7d9493SBabu Moger 3349fa7d9493SBabu Moger /* Give any tasks back to the parent group */ 3350fa7d9493SBabu Moger rdt_move_group_tasks(rdtgrp, prdtgrp, tmpmask); 3351fa7d9493SBabu Moger 3352fa7d9493SBabu Moger /* Update per cpu rmid of the moved CPUs first */ 3353fa7d9493SBabu Moger for_each_cpu(cpu, &rdtgrp->cpu_mask) 3354fa7d9493SBabu Moger per_cpu(pqr_state.default_rmid, cpu) = prdtgrp->mon.rmid; 3355fa7d9493SBabu Moger /* 3356fa7d9493SBabu Moger * Update the MSR on moved CPUs and CPUs which have moved 3357fa7d9493SBabu Moger * task running on them. 3358fa7d9493SBabu Moger */ 3359fa7d9493SBabu Moger cpumask_or(tmpmask, tmpmask, &rdtgrp->cpu_mask); 3360fa7d9493SBabu Moger update_closid_rmid(tmpmask, NULL); 3361fa7d9493SBabu Moger 3362fa7d9493SBabu Moger rdtgrp->flags = RDT_DELETED; 3363fa7d9493SBabu Moger free_rmid(rdtgrp->mon.rmid); 3364fa7d9493SBabu Moger 3365fa7d9493SBabu Moger /* 3366fa7d9493SBabu Moger * Remove the rdtgrp from the parent ctrl_mon group's list 3367fa7d9493SBabu Moger */ 3368fa7d9493SBabu Moger WARN_ON(list_empty(&prdtgrp->mon.crdtgrp_list)); 3369fa7d9493SBabu Moger list_del(&rdtgrp->mon.crdtgrp_list); 3370fa7d9493SBabu Moger 3371fa7d9493SBabu Moger kernfs_remove(rdtgrp->kn); 3372fa7d9493SBabu Moger 3373fa7d9493SBabu Moger return 0; 3374fa7d9493SBabu Moger } 3375fa7d9493SBabu Moger 337619eb86a7SXiaochen Shen static int rdtgroup_ctrl_remove(struct rdtgroup *rdtgrp) 3377fa7d9493SBabu Moger { 3378fa7d9493SBabu Moger rdtgrp->flags = RDT_DELETED; 3379fa7d9493SBabu Moger list_del(&rdtgrp->rdtgroup_list); 3380fa7d9493SBabu Moger 3381fa7d9493SBabu Moger kernfs_remove(rdtgrp->kn); 3382fa7d9493SBabu Moger return 0; 3383fa7d9493SBabu Moger } 3384fa7d9493SBabu Moger 338519eb86a7SXiaochen Shen static int rdtgroup_rmdir_ctrl(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask) 3386fa7d9493SBabu Moger { 3387fa7d9493SBabu Moger int cpu; 3388fa7d9493SBabu Moger 3389fa7d9493SBabu Moger /* Give any tasks back to the default group */ 3390fa7d9493SBabu Moger rdt_move_group_tasks(rdtgrp, &rdtgroup_default, tmpmask); 3391fa7d9493SBabu Moger 3392fa7d9493SBabu Moger /* Give any CPUs back to the default group */ 3393fa7d9493SBabu Moger cpumask_or(&rdtgroup_default.cpu_mask, 3394fa7d9493SBabu Moger &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask); 3395fa7d9493SBabu Moger 3396fa7d9493SBabu Moger /* Update per cpu closid and rmid of the moved CPUs first */ 3397fa7d9493SBabu Moger for_each_cpu(cpu, &rdtgrp->cpu_mask) { 3398fa7d9493SBabu Moger per_cpu(pqr_state.default_closid, cpu) = rdtgroup_default.closid; 3399fa7d9493SBabu Moger per_cpu(pqr_state.default_rmid, cpu) = rdtgroup_default.mon.rmid; 3400fa7d9493SBabu Moger } 3401fa7d9493SBabu Moger 3402fa7d9493SBabu Moger /* 3403fa7d9493SBabu Moger * Update the MSR on moved CPUs and CPUs which have moved 3404fa7d9493SBabu Moger * task running on them. 3405fa7d9493SBabu Moger */ 3406fa7d9493SBabu Moger cpumask_or(tmpmask, tmpmask, &rdtgrp->cpu_mask); 3407fa7d9493SBabu Moger update_closid_rmid(tmpmask, NULL); 3408fa7d9493SBabu Moger 3409fa7d9493SBabu Moger closid_free(rdtgrp->closid); 3410fa7d9493SBabu Moger free_rmid(rdtgrp->mon.rmid); 3411fa7d9493SBabu Moger 341219eb86a7SXiaochen Shen rdtgroup_ctrl_remove(rdtgrp); 3413074fadeeSXiaochen Shen 3414fa7d9493SBabu Moger /* 3415fa7d9493SBabu Moger * Free all the child monitor group rmids. 3416fa7d9493SBabu Moger */ 3417fa7d9493SBabu Moger free_all_child_rdtgrp(rdtgrp); 3418fa7d9493SBabu Moger 3419fa7d9493SBabu Moger return 0; 3420fa7d9493SBabu Moger } 3421fa7d9493SBabu Moger 3422fa7d9493SBabu Moger static int rdtgroup_rmdir(struct kernfs_node *kn) 3423fa7d9493SBabu Moger { 3424fa7d9493SBabu Moger struct kernfs_node *parent_kn = kn->parent; 3425fa7d9493SBabu Moger struct rdtgroup *rdtgrp; 3426fa7d9493SBabu Moger cpumask_var_t tmpmask; 3427fa7d9493SBabu Moger int ret = 0; 3428fa7d9493SBabu Moger 3429fa7d9493SBabu Moger if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL)) 3430fa7d9493SBabu Moger return -ENOMEM; 3431fa7d9493SBabu Moger 3432fa7d9493SBabu Moger rdtgrp = rdtgroup_kn_lock_live(kn); 3433fa7d9493SBabu Moger if (!rdtgrp) { 3434fa7d9493SBabu Moger ret = -EPERM; 3435fa7d9493SBabu Moger goto out; 3436fa7d9493SBabu Moger } 3437fa7d9493SBabu Moger 3438fa7d9493SBabu Moger /* 3439fa7d9493SBabu Moger * If the rdtgroup is a ctrl_mon group and parent directory 3440fa7d9493SBabu Moger * is the root directory, remove the ctrl_mon group. 3441fa7d9493SBabu Moger * 3442fa7d9493SBabu Moger * If the rdtgroup is a mon group and parent directory 3443fa7d9493SBabu Moger * is a valid "mon_groups" directory, remove the mon group. 3444fa7d9493SBabu Moger */ 3445b0151da5SReinette Chatre if (rdtgrp->type == RDTCTRL_GROUP && parent_kn == rdtgroup_default.kn && 3446b0151da5SReinette Chatre rdtgrp != &rdtgroup_default) { 3447fa7d9493SBabu Moger if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP || 3448fa7d9493SBabu Moger rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) { 344919eb86a7SXiaochen Shen ret = rdtgroup_ctrl_remove(rdtgrp); 3450fa7d9493SBabu Moger } else { 345119eb86a7SXiaochen Shen ret = rdtgroup_rmdir_ctrl(rdtgrp, tmpmask); 3452fa7d9493SBabu Moger } 3453fa7d9493SBabu Moger } else if (rdtgrp->type == RDTMON_GROUP && 3454fa7d9493SBabu Moger is_mon_groups(parent_kn, kn->name)) { 345519eb86a7SXiaochen Shen ret = rdtgroup_rmdir_mon(rdtgrp, tmpmask); 3456fa7d9493SBabu Moger } else { 3457fa7d9493SBabu Moger ret = -EPERM; 3458fa7d9493SBabu Moger } 3459fa7d9493SBabu Moger 3460fa7d9493SBabu Moger out: 3461fa7d9493SBabu Moger rdtgroup_kn_unlock(kn); 3462fa7d9493SBabu Moger free_cpumask_var(tmpmask); 3463fa7d9493SBabu Moger return ret; 3464fa7d9493SBabu Moger } 3465fa7d9493SBabu Moger 3466fa7d9493SBabu Moger static int rdtgroup_show_options(struct seq_file *seq, struct kernfs_root *kf) 3467fa7d9493SBabu Moger { 3468c091e907SJames Morse if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3)) 3469fa7d9493SBabu Moger seq_puts(seq, ",cdp"); 3470fa7d9493SBabu Moger 3471c091e907SJames Morse if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2)) 3472fa7d9493SBabu Moger seq_puts(seq, ",cdpl2"); 3473fa7d9493SBabu Moger 347463c8b123SJames Morse if (is_mba_sc(&rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl)) 3475fa7d9493SBabu Moger seq_puts(seq, ",mba_MBps"); 3476fa7d9493SBabu Moger 3477fa7d9493SBabu Moger return 0; 3478fa7d9493SBabu Moger } 3479fa7d9493SBabu Moger 3480fa7d9493SBabu Moger static struct kernfs_syscall_ops rdtgroup_kf_syscall_ops = { 3481fa7d9493SBabu Moger .mkdir = rdtgroup_mkdir, 3482fa7d9493SBabu Moger .rmdir = rdtgroup_rmdir, 3483fa7d9493SBabu Moger .show_options = rdtgroup_show_options, 3484fa7d9493SBabu Moger }; 3485fa7d9493SBabu Moger 3486fa7d9493SBabu Moger static int __init rdtgroup_setup_root(void) 3487fa7d9493SBabu Moger { 3488fa7d9493SBabu Moger int ret; 3489fa7d9493SBabu Moger 3490fa7d9493SBabu Moger rdt_root = kernfs_create_root(&rdtgroup_kf_syscall_ops, 3491fa7d9493SBabu Moger KERNFS_ROOT_CREATE_DEACTIVATED | 3492fa7d9493SBabu Moger KERNFS_ROOT_EXTRA_OPEN_PERM_CHECK, 3493fa7d9493SBabu Moger &rdtgroup_default); 3494fa7d9493SBabu Moger if (IS_ERR(rdt_root)) 3495fa7d9493SBabu Moger return PTR_ERR(rdt_root); 3496fa7d9493SBabu Moger 3497fa7d9493SBabu Moger mutex_lock(&rdtgroup_mutex); 3498fa7d9493SBabu Moger 3499fa7d9493SBabu Moger rdtgroup_default.closid = 0; 3500fa7d9493SBabu Moger rdtgroup_default.mon.rmid = 0; 3501fa7d9493SBabu Moger rdtgroup_default.type = RDTCTRL_GROUP; 3502fa7d9493SBabu Moger INIT_LIST_HEAD(&rdtgroup_default.mon.crdtgrp_list); 3503fa7d9493SBabu Moger 3504fa7d9493SBabu Moger list_add(&rdtgroup_default.rdtgroup_list, &rdt_all_groups); 3505fa7d9493SBabu Moger 3506f2eb478fSGreg Kroah-Hartman ret = rdtgroup_add_files(kernfs_root_to_node(rdt_root), RF_CTRL_BASE); 3507fa7d9493SBabu Moger if (ret) { 3508fa7d9493SBabu Moger kernfs_destroy_root(rdt_root); 3509fa7d9493SBabu Moger goto out; 3510fa7d9493SBabu Moger } 3511fa7d9493SBabu Moger 3512f2eb478fSGreg Kroah-Hartman rdtgroup_default.kn = kernfs_root_to_node(rdt_root); 3513fa7d9493SBabu Moger kernfs_activate(rdtgroup_default.kn); 3514fa7d9493SBabu Moger 3515fa7d9493SBabu Moger out: 3516fa7d9493SBabu Moger mutex_unlock(&rdtgroup_mutex); 3517fa7d9493SBabu Moger 3518fa7d9493SBabu Moger return ret; 3519fa7d9493SBabu Moger } 3520fa7d9493SBabu Moger 3521798fd4b9SJames Morse static void domain_destroy_mon_state(struct rdt_domain *d) 3522798fd4b9SJames Morse { 3523798fd4b9SJames Morse bitmap_free(d->rmid_busy_llc); 3524798fd4b9SJames Morse kfree(d->mbm_total); 3525798fd4b9SJames Morse kfree(d->mbm_local); 3526798fd4b9SJames Morse } 3527798fd4b9SJames Morse 3528798fd4b9SJames Morse void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d) 3529798fd4b9SJames Morse { 3530798fd4b9SJames Morse lockdep_assert_held(&rdtgroup_mutex); 3531798fd4b9SJames Morse 3532781096d9SJames Morse if (supports_mba_mbps() && r->rid == RDT_RESOURCE_MBA) 3533781096d9SJames Morse mba_sc_domain_destroy(r, d); 3534781096d9SJames Morse 3535798fd4b9SJames Morse if (!r->mon_capable) 3536798fd4b9SJames Morse return; 3537798fd4b9SJames Morse 3538798fd4b9SJames Morse /* 3539798fd4b9SJames Morse * If resctrl is mounted, remove all the 3540798fd4b9SJames Morse * per domain monitor data directories. 3541798fd4b9SJames Morse */ 3542798fd4b9SJames Morse if (static_branch_unlikely(&rdt_mon_enable_key)) 3543798fd4b9SJames Morse rmdir_mondata_subdir_allrdtgrp(r, d->id); 3544798fd4b9SJames Morse 3545798fd4b9SJames Morse if (is_mbm_enabled()) 3546798fd4b9SJames Morse cancel_delayed_work(&d->mbm_over); 3547798fd4b9SJames Morse if (is_llc_occupancy_enabled() && has_busy_rmid(r, d)) { 3548798fd4b9SJames Morse /* 3549798fd4b9SJames Morse * When a package is going down, forcefully 3550798fd4b9SJames Morse * decrement rmid->ebusy. There is no way to know 3551798fd4b9SJames Morse * that the L3 was flushed and hence may lead to 3552798fd4b9SJames Morse * incorrect counts in rare scenarios, but leaving 3553798fd4b9SJames Morse * the RMID as busy creates RMID leaks if the 3554798fd4b9SJames Morse * package never comes back. 3555798fd4b9SJames Morse */ 3556798fd4b9SJames Morse __check_limbo(d, true); 3557798fd4b9SJames Morse cancel_delayed_work(&d->cqm_limbo); 3558798fd4b9SJames Morse } 3559798fd4b9SJames Morse 3560798fd4b9SJames Morse domain_destroy_mon_state(d); 3561798fd4b9SJames Morse } 3562798fd4b9SJames Morse 35633a7232cdSJames Morse static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_domain *d) 35643a7232cdSJames Morse { 35653a7232cdSJames Morse size_t tsize; 35663a7232cdSJames Morse 35673a7232cdSJames Morse if (is_llc_occupancy_enabled()) { 35683a7232cdSJames Morse d->rmid_busy_llc = bitmap_zalloc(r->num_rmid, GFP_KERNEL); 35693a7232cdSJames Morse if (!d->rmid_busy_llc) 35703a7232cdSJames Morse return -ENOMEM; 35713a7232cdSJames Morse } 35723a7232cdSJames Morse if (is_mbm_total_enabled()) { 35733a7232cdSJames Morse tsize = sizeof(*d->mbm_total); 35743a7232cdSJames Morse d->mbm_total = kcalloc(r->num_rmid, tsize, GFP_KERNEL); 35753a7232cdSJames Morse if (!d->mbm_total) { 35763a7232cdSJames Morse bitmap_free(d->rmid_busy_llc); 35773a7232cdSJames Morse return -ENOMEM; 35783a7232cdSJames Morse } 35793a7232cdSJames Morse } 35803a7232cdSJames Morse if (is_mbm_local_enabled()) { 35813a7232cdSJames Morse tsize = sizeof(*d->mbm_local); 35823a7232cdSJames Morse d->mbm_local = kcalloc(r->num_rmid, tsize, GFP_KERNEL); 35833a7232cdSJames Morse if (!d->mbm_local) { 35843a7232cdSJames Morse bitmap_free(d->rmid_busy_llc); 35853a7232cdSJames Morse kfree(d->mbm_total); 35863a7232cdSJames Morse return -ENOMEM; 35873a7232cdSJames Morse } 35883a7232cdSJames Morse } 35893a7232cdSJames Morse 35903a7232cdSJames Morse return 0; 35913a7232cdSJames Morse } 35923a7232cdSJames Morse 35933a7232cdSJames Morse int resctrl_online_domain(struct rdt_resource *r, struct rdt_domain *d) 35943a7232cdSJames Morse { 35953a7232cdSJames Morse int err; 35963a7232cdSJames Morse 35973a7232cdSJames Morse lockdep_assert_held(&rdtgroup_mutex); 35983a7232cdSJames Morse 3599781096d9SJames Morse if (supports_mba_mbps() && r->rid == RDT_RESOURCE_MBA) 3600781096d9SJames Morse /* RDT_RESOURCE_MBA is never mon_capable */ 3601781096d9SJames Morse return mba_sc_domain_allocate(r, d); 3602781096d9SJames Morse 36033a7232cdSJames Morse if (!r->mon_capable) 36043a7232cdSJames Morse return 0; 36053a7232cdSJames Morse 36063a7232cdSJames Morse err = domain_setup_mon_state(r, d); 36073a7232cdSJames Morse if (err) 36083a7232cdSJames Morse return err; 36093a7232cdSJames Morse 36103a7232cdSJames Morse if (is_mbm_enabled()) { 36113a7232cdSJames Morse INIT_DELAYED_WORK(&d->mbm_over, mbm_handle_overflow); 36123a7232cdSJames Morse mbm_setup_overflow_handler(d, MBM_OVERFLOW_INTERVAL); 36133a7232cdSJames Morse } 36143a7232cdSJames Morse 36153a7232cdSJames Morse if (is_llc_occupancy_enabled()) 36163a7232cdSJames Morse INIT_DELAYED_WORK(&d->cqm_limbo, cqm_handle_limbo); 36173a7232cdSJames Morse 36183a7232cdSJames Morse /* If resctrl is mounted, add per domain monitor data directories. */ 36193a7232cdSJames Morse if (static_branch_unlikely(&rdt_mon_enable_key)) 36203a7232cdSJames Morse mkdir_mondata_subdir_allrdtgrp(r, d); 36213a7232cdSJames Morse 36223a7232cdSJames Morse return 0; 36233a7232cdSJames Morse } 36243a7232cdSJames Morse 3625fa7d9493SBabu Moger /* 3626fa7d9493SBabu Moger * rdtgroup_init - rdtgroup initialization 3627fa7d9493SBabu Moger * 3628fa7d9493SBabu Moger * Setup resctrl file system including set up root, create mount point, 3629fa7d9493SBabu Moger * register rdtgroup filesystem, and initialize files under root directory. 3630fa7d9493SBabu Moger * 3631fa7d9493SBabu Moger * Return: 0 on success or -errno 3632fa7d9493SBabu Moger */ 3633fa7d9493SBabu Moger int __init rdtgroup_init(void) 3634fa7d9493SBabu Moger { 3635fa7d9493SBabu Moger int ret = 0; 3636fa7d9493SBabu Moger 3637fa7d9493SBabu Moger seq_buf_init(&last_cmd_status, last_cmd_status_buf, 3638fa7d9493SBabu Moger sizeof(last_cmd_status_buf)); 3639fa7d9493SBabu Moger 3640fa7d9493SBabu Moger ret = rdtgroup_setup_root(); 3641fa7d9493SBabu Moger if (ret) 3642fa7d9493SBabu Moger return ret; 3643fa7d9493SBabu Moger 3644fa7d9493SBabu Moger ret = sysfs_create_mount_point(fs_kobj, "resctrl"); 3645fa7d9493SBabu Moger if (ret) 3646fa7d9493SBabu Moger goto cleanup_root; 3647fa7d9493SBabu Moger 3648fa7d9493SBabu Moger ret = register_filesystem(&rdt_fs_type); 3649fa7d9493SBabu Moger if (ret) 3650fa7d9493SBabu Moger goto cleanup_mountpoint; 3651fa7d9493SBabu Moger 3652fa7d9493SBabu Moger /* 3653fa7d9493SBabu Moger * Adding the resctrl debugfs directory here may not be ideal since 3654fa7d9493SBabu Moger * it would let the resctrl debugfs directory appear on the debugfs 3655fa7d9493SBabu Moger * filesystem before the resctrl filesystem is mounted. 3656fa7d9493SBabu Moger * It may also be ok since that would enable debugging of RDT before 3657fa7d9493SBabu Moger * resctrl is mounted. 3658fa7d9493SBabu Moger * The reason why the debugfs directory is created here and not in 3659ae0fbeddSJames Morse * rdt_get_tree() is because rdt_get_tree() takes rdtgroup_mutex and 3660fa7d9493SBabu Moger * during the debugfs directory creation also &sb->s_type->i_mutex_key 3661fa7d9493SBabu Moger * (the lockdep class of inode->i_rwsem). Other filesystem 3662fa7d9493SBabu Moger * interactions (eg. SyS_getdents) have the lock ordering: 3663c1e8d7c6SMichel Lespinasse * &sb->s_type->i_mutex_key --> &mm->mmap_lock 3664c1e8d7c6SMichel Lespinasse * During mmap(), called with &mm->mmap_lock, the rdtgroup_mutex 3665fa7d9493SBabu Moger * is taken, thus creating dependency: 3666c1e8d7c6SMichel Lespinasse * &mm->mmap_lock --> rdtgroup_mutex for the latter that can cause 3667fa7d9493SBabu Moger * issues considering the other two lock dependencies. 3668fa7d9493SBabu Moger * By creating the debugfs directory here we avoid a dependency 3669fa7d9493SBabu Moger * that may cause deadlock (even though file operations cannot 3670fa7d9493SBabu Moger * occur until the filesystem is mounted, but I do not know how to 3671fa7d9493SBabu Moger * tell lockdep that). 3672fa7d9493SBabu Moger */ 3673fa7d9493SBabu Moger debugfs_resctrl = debugfs_create_dir("resctrl", NULL); 3674fa7d9493SBabu Moger 3675fa7d9493SBabu Moger return 0; 3676fa7d9493SBabu Moger 3677fa7d9493SBabu Moger cleanup_mountpoint: 3678fa7d9493SBabu Moger sysfs_remove_mount_point(fs_kobj, "resctrl"); 3679fa7d9493SBabu Moger cleanup_root: 3680fa7d9493SBabu Moger kernfs_destroy_root(rdt_root); 3681fa7d9493SBabu Moger 3682fa7d9493SBabu Moger return ret; 3683fa7d9493SBabu Moger } 3684fa7d9493SBabu Moger 3685fa7d9493SBabu Moger void __exit rdtgroup_exit(void) 3686fa7d9493SBabu Moger { 3687fa7d9493SBabu Moger debugfs_remove_recursive(debugfs_resctrl); 3688fa7d9493SBabu Moger unregister_filesystem(&rdt_fs_type); 3689fa7d9493SBabu Moger sysfs_remove_mount_point(fs_kobj, "resctrl"); 3690fa7d9493SBabu Moger kernfs_destroy_root(rdt_root); 3691fa7d9493SBabu Moger } 3692