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 { 328fa7d9493SBabu Moger int cpu = get_cpu(); 329fa7d9493SBabu Moger 330fa7d9493SBabu Moger if (cpumask_test_cpu(cpu, cpu_mask)) 331fa7d9493SBabu Moger update_cpu_closid_rmid(r); 332fa7d9493SBabu Moger smp_call_function_many(cpu_mask, update_cpu_closid_rmid, r, 1); 333fa7d9493SBabu Moger put_cpu(); 334fa7d9493SBabu Moger } 335fa7d9493SBabu Moger 336fa7d9493SBabu Moger static int cpus_mon_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask, 337fa7d9493SBabu Moger cpumask_var_t tmpmask) 338fa7d9493SBabu Moger { 339fa7d9493SBabu Moger struct rdtgroup *prgrp = rdtgrp->mon.parent, *crgrp; 340fa7d9493SBabu Moger struct list_head *head; 341fa7d9493SBabu Moger 342fa7d9493SBabu Moger /* Check whether cpus belong to parent ctrl group */ 343fa7d9493SBabu Moger cpumask_andnot(tmpmask, newmask, &prgrp->cpu_mask); 3443a5ff1f6SYury Norov if (!cpumask_empty(tmpmask)) { 345723f1a0dSBabu Moger rdt_last_cmd_puts("Can only add CPUs to mongroup that belong to parent\n"); 346fa7d9493SBabu Moger return -EINVAL; 347fa7d9493SBabu Moger } 348fa7d9493SBabu Moger 349fa7d9493SBabu Moger /* Check whether cpus are dropped from this group */ 350fa7d9493SBabu Moger cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask); 3513a5ff1f6SYury Norov if (!cpumask_empty(tmpmask)) { 352fa7d9493SBabu Moger /* Give any dropped cpus to parent rdtgroup */ 353fa7d9493SBabu Moger cpumask_or(&prgrp->cpu_mask, &prgrp->cpu_mask, tmpmask); 354fa7d9493SBabu Moger update_closid_rmid(tmpmask, prgrp); 355fa7d9493SBabu Moger } 356fa7d9493SBabu Moger 357fa7d9493SBabu Moger /* 358fa7d9493SBabu Moger * If we added cpus, remove them from previous group that owned them 359fa7d9493SBabu Moger * and update per-cpu rmid 360fa7d9493SBabu Moger */ 361fa7d9493SBabu Moger cpumask_andnot(tmpmask, newmask, &rdtgrp->cpu_mask); 3623a5ff1f6SYury Norov if (!cpumask_empty(tmpmask)) { 363fa7d9493SBabu Moger head = &prgrp->mon.crdtgrp_list; 364fa7d9493SBabu Moger list_for_each_entry(crgrp, head, mon.crdtgrp_list) { 365fa7d9493SBabu Moger if (crgrp == rdtgrp) 366fa7d9493SBabu Moger continue; 367fa7d9493SBabu Moger cpumask_andnot(&crgrp->cpu_mask, &crgrp->cpu_mask, 368fa7d9493SBabu Moger tmpmask); 369fa7d9493SBabu Moger } 370fa7d9493SBabu Moger update_closid_rmid(tmpmask, rdtgrp); 371fa7d9493SBabu Moger } 372fa7d9493SBabu Moger 373fa7d9493SBabu Moger /* Done pushing/pulling - update this group with new mask */ 374fa7d9493SBabu Moger cpumask_copy(&rdtgrp->cpu_mask, newmask); 375fa7d9493SBabu Moger 376fa7d9493SBabu Moger return 0; 377fa7d9493SBabu Moger } 378fa7d9493SBabu Moger 379fa7d9493SBabu Moger static void cpumask_rdtgrp_clear(struct rdtgroup *r, struct cpumask *m) 380fa7d9493SBabu Moger { 381fa7d9493SBabu Moger struct rdtgroup *crgrp; 382fa7d9493SBabu Moger 383fa7d9493SBabu Moger cpumask_andnot(&r->cpu_mask, &r->cpu_mask, m); 384fa7d9493SBabu Moger /* update the child mon group masks as well*/ 385fa7d9493SBabu Moger list_for_each_entry(crgrp, &r->mon.crdtgrp_list, mon.crdtgrp_list) 386fa7d9493SBabu Moger cpumask_and(&crgrp->cpu_mask, &r->cpu_mask, &crgrp->cpu_mask); 387fa7d9493SBabu Moger } 388fa7d9493SBabu Moger 389fa7d9493SBabu Moger static int cpus_ctrl_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask, 390fa7d9493SBabu Moger cpumask_var_t tmpmask, cpumask_var_t tmpmask1) 391fa7d9493SBabu Moger { 392fa7d9493SBabu Moger struct rdtgroup *r, *crgrp; 393fa7d9493SBabu Moger struct list_head *head; 394fa7d9493SBabu Moger 395fa7d9493SBabu Moger /* Check whether cpus are dropped from this group */ 396fa7d9493SBabu Moger cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask); 3973a5ff1f6SYury Norov if (!cpumask_empty(tmpmask)) { 398fa7d9493SBabu Moger /* Can't drop from default group */ 399fa7d9493SBabu Moger if (rdtgrp == &rdtgroup_default) { 400fa7d9493SBabu Moger rdt_last_cmd_puts("Can't drop CPUs from default group\n"); 401fa7d9493SBabu Moger return -EINVAL; 402fa7d9493SBabu Moger } 403fa7d9493SBabu Moger 404fa7d9493SBabu Moger /* Give any dropped cpus to rdtgroup_default */ 405fa7d9493SBabu Moger cpumask_or(&rdtgroup_default.cpu_mask, 406fa7d9493SBabu Moger &rdtgroup_default.cpu_mask, tmpmask); 407fa7d9493SBabu Moger update_closid_rmid(tmpmask, &rdtgroup_default); 408fa7d9493SBabu Moger } 409fa7d9493SBabu Moger 410fa7d9493SBabu Moger /* 411fa7d9493SBabu Moger * If we added cpus, remove them from previous group and 412fa7d9493SBabu Moger * the prev group's child groups that owned them 413fa7d9493SBabu Moger * and update per-cpu closid/rmid. 414fa7d9493SBabu Moger */ 415fa7d9493SBabu Moger cpumask_andnot(tmpmask, newmask, &rdtgrp->cpu_mask); 4163a5ff1f6SYury Norov if (!cpumask_empty(tmpmask)) { 417fa7d9493SBabu Moger list_for_each_entry(r, &rdt_all_groups, rdtgroup_list) { 418fa7d9493SBabu Moger if (r == rdtgrp) 419fa7d9493SBabu Moger continue; 420fa7d9493SBabu Moger cpumask_and(tmpmask1, &r->cpu_mask, tmpmask); 4213a5ff1f6SYury Norov if (!cpumask_empty(tmpmask1)) 422fa7d9493SBabu Moger cpumask_rdtgrp_clear(r, tmpmask1); 423fa7d9493SBabu Moger } 424fa7d9493SBabu Moger update_closid_rmid(tmpmask, rdtgrp); 425fa7d9493SBabu Moger } 426fa7d9493SBabu Moger 427fa7d9493SBabu Moger /* Done pushing/pulling - update this group with new mask */ 428fa7d9493SBabu Moger cpumask_copy(&rdtgrp->cpu_mask, newmask); 429fa7d9493SBabu Moger 430fa7d9493SBabu Moger /* 431fa7d9493SBabu Moger * Clear child mon group masks since there is a new parent mask 432fa7d9493SBabu Moger * now and update the rmid for the cpus the child lost. 433fa7d9493SBabu Moger */ 434fa7d9493SBabu Moger head = &rdtgrp->mon.crdtgrp_list; 435fa7d9493SBabu Moger list_for_each_entry(crgrp, head, mon.crdtgrp_list) { 436fa7d9493SBabu Moger cpumask_and(tmpmask, &rdtgrp->cpu_mask, &crgrp->cpu_mask); 437fa7d9493SBabu Moger update_closid_rmid(tmpmask, rdtgrp); 438fa7d9493SBabu Moger cpumask_clear(&crgrp->cpu_mask); 439fa7d9493SBabu Moger } 440fa7d9493SBabu Moger 441fa7d9493SBabu Moger return 0; 442fa7d9493SBabu Moger } 443fa7d9493SBabu Moger 444fa7d9493SBabu Moger static ssize_t rdtgroup_cpus_write(struct kernfs_open_file *of, 445fa7d9493SBabu Moger char *buf, size_t nbytes, loff_t off) 446fa7d9493SBabu Moger { 447fa7d9493SBabu Moger cpumask_var_t tmpmask, newmask, tmpmask1; 448fa7d9493SBabu Moger struct rdtgroup *rdtgrp; 449fa7d9493SBabu Moger int ret; 450fa7d9493SBabu Moger 451fa7d9493SBabu Moger if (!buf) 452fa7d9493SBabu Moger return -EINVAL; 453fa7d9493SBabu Moger 454fa7d9493SBabu Moger if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL)) 455fa7d9493SBabu Moger return -ENOMEM; 456fa7d9493SBabu Moger if (!zalloc_cpumask_var(&newmask, GFP_KERNEL)) { 457fa7d9493SBabu Moger free_cpumask_var(tmpmask); 458fa7d9493SBabu Moger return -ENOMEM; 459fa7d9493SBabu Moger } 460fa7d9493SBabu Moger if (!zalloc_cpumask_var(&tmpmask1, GFP_KERNEL)) { 461fa7d9493SBabu Moger free_cpumask_var(tmpmask); 462fa7d9493SBabu Moger free_cpumask_var(newmask); 463fa7d9493SBabu Moger return -ENOMEM; 464fa7d9493SBabu Moger } 465fa7d9493SBabu Moger 466fa7d9493SBabu Moger rdtgrp = rdtgroup_kn_lock_live(of->kn); 467fa7d9493SBabu Moger if (!rdtgrp) { 468fa7d9493SBabu Moger ret = -ENOENT; 469fa7d9493SBabu Moger goto unlock; 470fa7d9493SBabu Moger } 471fa7d9493SBabu Moger 472fa7d9493SBabu Moger if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED || 473fa7d9493SBabu Moger rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) { 474fa7d9493SBabu Moger ret = -EINVAL; 475723f1a0dSBabu Moger rdt_last_cmd_puts("Pseudo-locking in progress\n"); 476fa7d9493SBabu Moger goto unlock; 477fa7d9493SBabu Moger } 478fa7d9493SBabu Moger 479fa7d9493SBabu Moger if (is_cpu_list(of)) 480fa7d9493SBabu Moger ret = cpulist_parse(buf, newmask); 481fa7d9493SBabu Moger else 482fa7d9493SBabu Moger ret = cpumask_parse(buf, newmask); 483fa7d9493SBabu Moger 484fa7d9493SBabu Moger if (ret) { 485723f1a0dSBabu Moger rdt_last_cmd_puts("Bad CPU list/mask\n"); 486fa7d9493SBabu Moger goto unlock; 487fa7d9493SBabu Moger } 488fa7d9493SBabu Moger 489fa7d9493SBabu Moger /* check that user didn't specify any offline cpus */ 490fa7d9493SBabu Moger cpumask_andnot(tmpmask, newmask, cpu_online_mask); 4913a5ff1f6SYury Norov if (!cpumask_empty(tmpmask)) { 492fa7d9493SBabu Moger ret = -EINVAL; 493723f1a0dSBabu Moger rdt_last_cmd_puts("Can only assign online CPUs\n"); 494fa7d9493SBabu Moger goto unlock; 495fa7d9493SBabu Moger } 496fa7d9493SBabu Moger 497fa7d9493SBabu Moger if (rdtgrp->type == RDTCTRL_GROUP) 498fa7d9493SBabu Moger ret = cpus_ctrl_write(rdtgrp, newmask, tmpmask, tmpmask1); 499fa7d9493SBabu Moger else if (rdtgrp->type == RDTMON_GROUP) 500fa7d9493SBabu Moger ret = cpus_mon_write(rdtgrp, newmask, tmpmask); 501fa7d9493SBabu Moger else 502fa7d9493SBabu Moger ret = -EINVAL; 503fa7d9493SBabu Moger 504fa7d9493SBabu Moger unlock: 505fa7d9493SBabu Moger rdtgroup_kn_unlock(of->kn); 506fa7d9493SBabu Moger free_cpumask_var(tmpmask); 507fa7d9493SBabu Moger free_cpumask_var(newmask); 508fa7d9493SBabu Moger free_cpumask_var(tmpmask1); 509fa7d9493SBabu Moger 510fa7d9493SBabu Moger return ret ?: nbytes; 511fa7d9493SBabu Moger } 512fa7d9493SBabu Moger 51375899924SXiaochen Shen /** 51475899924SXiaochen Shen * rdtgroup_remove - the helper to remove resource group safely 51575899924SXiaochen Shen * @rdtgrp: resource group to remove 51675899924SXiaochen Shen * 51775899924SXiaochen Shen * On resource group creation via a mkdir, an extra kernfs_node reference is 51875899924SXiaochen Shen * taken to ensure that the rdtgroup structure remains accessible for the 51975899924SXiaochen Shen * rdtgroup_kn_unlock() calls where it is removed. 52075899924SXiaochen Shen * 52175899924SXiaochen Shen * Drop the extra reference here, then free the rdtgroup structure. 52275899924SXiaochen Shen * 52375899924SXiaochen Shen * Return: void 52475899924SXiaochen Shen */ 52575899924SXiaochen Shen static void rdtgroup_remove(struct rdtgroup *rdtgrp) 52675899924SXiaochen Shen { 52775899924SXiaochen Shen kernfs_put(rdtgrp->kn); 52875899924SXiaochen Shen kfree(rdtgrp); 52975899924SXiaochen Shen } 53075899924SXiaochen Shen 531ae28d1aaSFenghua Yu static void _update_task_closid_rmid(void *task) 532fa7d9493SBabu Moger { 533fa7d9493SBabu Moger /* 534ae28d1aaSFenghua Yu * If the task is still current on this CPU, update PQR_ASSOC MSR. 535ae28d1aaSFenghua Yu * Otherwise, the MSR is updated when the task is scheduled in. 536fa7d9493SBabu Moger */ 537ae28d1aaSFenghua Yu if (task == current) 538ae28d1aaSFenghua Yu resctrl_sched_in(); 539fa7d9493SBabu Moger } 540fa7d9493SBabu Moger 541ae28d1aaSFenghua Yu static void update_task_closid_rmid(struct task_struct *t) 542ae28d1aaSFenghua Yu { 543ae28d1aaSFenghua Yu if (IS_ENABLED(CONFIG_SMP) && task_curr(t)) 544ae28d1aaSFenghua Yu smp_call_function_single(task_cpu(t), _update_task_closid_rmid, t, 1); 545ae28d1aaSFenghua Yu else 546ae28d1aaSFenghua Yu _update_task_closid_rmid(t); 547fa7d9493SBabu Moger } 548fa7d9493SBabu Moger 549fa7d9493SBabu Moger static int __rdtgroup_move_task(struct task_struct *tsk, 550fa7d9493SBabu Moger struct rdtgroup *rdtgrp) 551fa7d9493SBabu Moger { 552a0195f31SFenghua Yu /* If the task is already in rdtgrp, no need to move the task. */ 553a0195f31SFenghua Yu if ((rdtgrp->type == RDTCTRL_GROUP && tsk->closid == rdtgrp->closid && 554a0195f31SFenghua Yu tsk->rmid == rdtgrp->mon.rmid) || 555a0195f31SFenghua Yu (rdtgrp->type == RDTMON_GROUP && tsk->rmid == rdtgrp->mon.rmid && 556a0195f31SFenghua Yu tsk->closid == rdtgrp->mon.parent->closid)) 557a0195f31SFenghua Yu return 0; 558a0195f31SFenghua Yu 559fa7d9493SBabu Moger /* 560ae28d1aaSFenghua Yu * Set the task's closid/rmid before the PQR_ASSOC MSR can be 561ae28d1aaSFenghua Yu * updated by them. 562ae28d1aaSFenghua Yu * 563ae28d1aaSFenghua Yu * For ctrl_mon groups, move both closid and rmid. 564fa7d9493SBabu Moger * For monitor groups, can move the tasks only from 565fa7d9493SBabu Moger * their parent CTRL group. 566fa7d9493SBabu Moger */ 567ae28d1aaSFenghua Yu 568fa7d9493SBabu Moger if (rdtgrp->type == RDTCTRL_GROUP) { 5696d3b47ddSValentin Schneider WRITE_ONCE(tsk->closid, rdtgrp->closid); 5706d3b47ddSValentin Schneider WRITE_ONCE(tsk->rmid, rdtgrp->mon.rmid); 571fa7d9493SBabu Moger } else if (rdtgrp->type == RDTMON_GROUP) { 572fa7d9493SBabu Moger if (rdtgrp->mon.parent->closid == tsk->closid) { 5736d3b47ddSValentin Schneider WRITE_ONCE(tsk->rmid, rdtgrp->mon.rmid); 574fa7d9493SBabu Moger } else { 575fa7d9493SBabu Moger rdt_last_cmd_puts("Can't move task to different control group\n"); 576ae28d1aaSFenghua Yu return -EINVAL; 577fa7d9493SBabu Moger } 578fa7d9493SBabu Moger } 579ae28d1aaSFenghua Yu 580ae28d1aaSFenghua Yu /* 581ae28d1aaSFenghua Yu * Ensure the task's closid and rmid are written before determining if 582ae28d1aaSFenghua Yu * the task is current that will decide if it will be interrupted. 583ae28d1aaSFenghua Yu */ 584ae28d1aaSFenghua Yu barrier(); 585ae28d1aaSFenghua Yu 586ae28d1aaSFenghua Yu /* 587ae28d1aaSFenghua Yu * By now, the task's closid and rmid are set. If the task is current 588ae28d1aaSFenghua Yu * on a CPU, the PQR_ASSOC MSR needs to be updated to make the resource 589ae28d1aaSFenghua Yu * group go into effect. If the task is not current, the MSR will be 590ae28d1aaSFenghua Yu * updated when the task is scheduled in. 591ae28d1aaSFenghua Yu */ 592ae28d1aaSFenghua Yu update_task_closid_rmid(tsk); 593ae28d1aaSFenghua Yu 594ae28d1aaSFenghua Yu return 0; 595fa7d9493SBabu Moger } 596fa7d9493SBabu Moger 597e6b2fac3SJames Morse static bool is_closid_match(struct task_struct *t, struct rdtgroup *r) 598e6b2fac3SJames Morse { 599e6b2fac3SJames Morse return (rdt_alloc_capable && 600e6b2fac3SJames Morse (r->type == RDTCTRL_GROUP) && (t->closid == r->closid)); 601e6b2fac3SJames Morse } 602e6b2fac3SJames Morse 603e6b2fac3SJames Morse static bool is_rmid_match(struct task_struct *t, struct rdtgroup *r) 604e6b2fac3SJames Morse { 605e6b2fac3SJames Morse return (rdt_mon_capable && 606e6b2fac3SJames Morse (r->type == RDTMON_GROUP) && (t->rmid == r->mon.rmid)); 607e6b2fac3SJames Morse } 608e6b2fac3SJames Morse 609fa7d9493SBabu Moger /** 610fa7d9493SBabu Moger * rdtgroup_tasks_assigned - Test if tasks have been assigned to resource group 611fa7d9493SBabu Moger * @r: Resource group 612fa7d9493SBabu Moger * 613fa7d9493SBabu Moger * Return: 1 if tasks have been assigned to @r, 0 otherwise 614fa7d9493SBabu Moger */ 615fa7d9493SBabu Moger int rdtgroup_tasks_assigned(struct rdtgroup *r) 616fa7d9493SBabu Moger { 617fa7d9493SBabu Moger struct task_struct *p, *t; 618fa7d9493SBabu Moger int ret = 0; 619fa7d9493SBabu Moger 620fa7d9493SBabu Moger lockdep_assert_held(&rdtgroup_mutex); 621fa7d9493SBabu Moger 622fa7d9493SBabu Moger rcu_read_lock(); 623fa7d9493SBabu Moger for_each_process_thread(p, t) { 624e6b2fac3SJames Morse if (is_closid_match(t, r) || is_rmid_match(t, r)) { 625fa7d9493SBabu Moger ret = 1; 626fa7d9493SBabu Moger break; 627fa7d9493SBabu Moger } 628fa7d9493SBabu Moger } 629fa7d9493SBabu Moger rcu_read_unlock(); 630fa7d9493SBabu Moger 631fa7d9493SBabu Moger return ret; 632fa7d9493SBabu Moger } 633fa7d9493SBabu Moger 634fa7d9493SBabu Moger static int rdtgroup_task_write_permission(struct task_struct *task, 635fa7d9493SBabu Moger struct kernfs_open_file *of) 636fa7d9493SBabu Moger { 637fa7d9493SBabu Moger const struct cred *tcred = get_task_cred(task); 638fa7d9493SBabu Moger const struct cred *cred = current_cred(); 639fa7d9493SBabu Moger int ret = 0; 640fa7d9493SBabu Moger 641fa7d9493SBabu Moger /* 642fa7d9493SBabu Moger * Even if we're attaching all tasks in the thread group, we only 643fa7d9493SBabu Moger * need to check permissions on one of them. 644fa7d9493SBabu Moger */ 645fa7d9493SBabu Moger if (!uid_eq(cred->euid, GLOBAL_ROOT_UID) && 646fa7d9493SBabu Moger !uid_eq(cred->euid, tcred->uid) && 647fa7d9493SBabu Moger !uid_eq(cred->euid, tcred->suid)) { 648fa7d9493SBabu Moger rdt_last_cmd_printf("No permission to move task %d\n", task->pid); 649fa7d9493SBabu Moger ret = -EPERM; 650fa7d9493SBabu Moger } 651fa7d9493SBabu Moger 652fa7d9493SBabu Moger put_cred(tcred); 653fa7d9493SBabu Moger return ret; 654fa7d9493SBabu Moger } 655fa7d9493SBabu Moger 656fa7d9493SBabu Moger static int rdtgroup_move_task(pid_t pid, struct rdtgroup *rdtgrp, 657fa7d9493SBabu Moger struct kernfs_open_file *of) 658fa7d9493SBabu Moger { 659fa7d9493SBabu Moger struct task_struct *tsk; 660fa7d9493SBabu Moger int ret; 661fa7d9493SBabu Moger 662fa7d9493SBabu Moger rcu_read_lock(); 663fa7d9493SBabu Moger if (pid) { 664fa7d9493SBabu Moger tsk = find_task_by_vpid(pid); 665fa7d9493SBabu Moger if (!tsk) { 666fa7d9493SBabu Moger rcu_read_unlock(); 667fa7d9493SBabu Moger rdt_last_cmd_printf("No task %d\n", pid); 668fa7d9493SBabu Moger return -ESRCH; 669fa7d9493SBabu Moger } 670fa7d9493SBabu Moger } else { 671fa7d9493SBabu Moger tsk = current; 672fa7d9493SBabu Moger } 673fa7d9493SBabu Moger 674fa7d9493SBabu Moger get_task_struct(tsk); 675fa7d9493SBabu Moger rcu_read_unlock(); 676fa7d9493SBabu Moger 677fa7d9493SBabu Moger ret = rdtgroup_task_write_permission(tsk, of); 678fa7d9493SBabu Moger if (!ret) 679fa7d9493SBabu Moger ret = __rdtgroup_move_task(tsk, rdtgrp); 680fa7d9493SBabu Moger 681fa7d9493SBabu Moger put_task_struct(tsk); 682fa7d9493SBabu Moger return ret; 683fa7d9493SBabu Moger } 684fa7d9493SBabu Moger 685fa7d9493SBabu Moger static ssize_t rdtgroup_tasks_write(struct kernfs_open_file *of, 686fa7d9493SBabu Moger char *buf, size_t nbytes, loff_t off) 687fa7d9493SBabu Moger { 688fa7d9493SBabu Moger struct rdtgroup *rdtgrp; 689fa7d9493SBabu Moger int ret = 0; 690fa7d9493SBabu Moger pid_t pid; 691fa7d9493SBabu Moger 692fa7d9493SBabu Moger if (kstrtoint(strstrip(buf), 0, &pid) || pid < 0) 693fa7d9493SBabu Moger return -EINVAL; 694fa7d9493SBabu Moger rdtgrp = rdtgroup_kn_lock_live(of->kn); 695fa7d9493SBabu Moger if (!rdtgrp) { 696fa7d9493SBabu Moger rdtgroup_kn_unlock(of->kn); 697fa7d9493SBabu Moger return -ENOENT; 698fa7d9493SBabu Moger } 699fa7d9493SBabu Moger rdt_last_cmd_clear(); 700fa7d9493SBabu Moger 701fa7d9493SBabu Moger if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED || 702fa7d9493SBabu Moger rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) { 703fa7d9493SBabu Moger ret = -EINVAL; 704723f1a0dSBabu Moger rdt_last_cmd_puts("Pseudo-locking in progress\n"); 705fa7d9493SBabu Moger goto unlock; 706fa7d9493SBabu Moger } 707fa7d9493SBabu Moger 708fa7d9493SBabu Moger ret = rdtgroup_move_task(pid, rdtgrp, of); 709fa7d9493SBabu Moger 710fa7d9493SBabu Moger unlock: 711fa7d9493SBabu Moger rdtgroup_kn_unlock(of->kn); 712fa7d9493SBabu Moger 713fa7d9493SBabu Moger return ret ?: nbytes; 714fa7d9493SBabu Moger } 715fa7d9493SBabu Moger 716fa7d9493SBabu Moger static void show_rdt_tasks(struct rdtgroup *r, struct seq_file *s) 717fa7d9493SBabu Moger { 718fa7d9493SBabu Moger struct task_struct *p, *t; 719fa7d9493SBabu Moger 720fa7d9493SBabu Moger rcu_read_lock(); 721fa7d9493SBabu Moger for_each_process_thread(p, t) { 722e6b2fac3SJames Morse if (is_closid_match(t, r) || is_rmid_match(t, r)) 723fa7d9493SBabu Moger seq_printf(s, "%d\n", t->pid); 724fa7d9493SBabu Moger } 725fa7d9493SBabu Moger rcu_read_unlock(); 726fa7d9493SBabu Moger } 727fa7d9493SBabu Moger 728fa7d9493SBabu Moger static int rdtgroup_tasks_show(struct kernfs_open_file *of, 729fa7d9493SBabu Moger struct seq_file *s, void *v) 730fa7d9493SBabu Moger { 731fa7d9493SBabu Moger struct rdtgroup *rdtgrp; 732fa7d9493SBabu Moger int ret = 0; 733fa7d9493SBabu Moger 734fa7d9493SBabu Moger rdtgrp = rdtgroup_kn_lock_live(of->kn); 735fa7d9493SBabu Moger if (rdtgrp) 736fa7d9493SBabu Moger show_rdt_tasks(rdtgrp, s); 737fa7d9493SBabu Moger else 738fa7d9493SBabu Moger ret = -ENOENT; 739fa7d9493SBabu Moger rdtgroup_kn_unlock(of->kn); 740fa7d9493SBabu Moger 741fa7d9493SBabu Moger return ret; 742fa7d9493SBabu Moger } 743fa7d9493SBabu Moger 744e79f15a4SChen Yu #ifdef CONFIG_PROC_CPU_RESCTRL 745e79f15a4SChen Yu 746e79f15a4SChen Yu /* 747e79f15a4SChen Yu * A task can only be part of one resctrl control group and of one monitor 748e79f15a4SChen Yu * group which is associated to that control group. 749e79f15a4SChen Yu * 750e79f15a4SChen Yu * 1) res: 751e79f15a4SChen Yu * mon: 752e79f15a4SChen Yu * 753e79f15a4SChen Yu * resctrl is not available. 754e79f15a4SChen Yu * 755e79f15a4SChen Yu * 2) res:/ 756e79f15a4SChen Yu * mon: 757e79f15a4SChen Yu * 758e79f15a4SChen Yu * Task is part of the root resctrl control group, and it is not associated 759e79f15a4SChen Yu * to any monitor group. 760e79f15a4SChen Yu * 761e79f15a4SChen Yu * 3) res:/ 762e79f15a4SChen Yu * mon:mon0 763e79f15a4SChen Yu * 764e79f15a4SChen Yu * Task is part of the root resctrl control group and monitor group mon0. 765e79f15a4SChen Yu * 766e79f15a4SChen Yu * 4) res:group0 767e79f15a4SChen Yu * mon: 768e79f15a4SChen Yu * 769e79f15a4SChen Yu * Task is part of resctrl control group group0, and it is not associated 770e79f15a4SChen Yu * to any monitor group. 771e79f15a4SChen Yu * 772e79f15a4SChen Yu * 5) res:group0 773e79f15a4SChen Yu * mon:mon1 774e79f15a4SChen Yu * 775e79f15a4SChen Yu * Task is part of resctrl control group group0 and monitor group mon1. 776e79f15a4SChen Yu */ 777e79f15a4SChen Yu int proc_resctrl_show(struct seq_file *s, struct pid_namespace *ns, 778e79f15a4SChen Yu struct pid *pid, struct task_struct *tsk) 779e79f15a4SChen Yu { 780e79f15a4SChen Yu struct rdtgroup *rdtg; 781e79f15a4SChen Yu int ret = 0; 782e79f15a4SChen Yu 783e79f15a4SChen Yu mutex_lock(&rdtgroup_mutex); 784e79f15a4SChen Yu 785e79f15a4SChen Yu /* Return empty if resctrl has not been mounted. */ 786e79f15a4SChen Yu if (!static_branch_unlikely(&rdt_enable_key)) { 787e79f15a4SChen Yu seq_puts(s, "res:\nmon:\n"); 788e79f15a4SChen Yu goto unlock; 789e79f15a4SChen Yu } 790e79f15a4SChen Yu 791e79f15a4SChen Yu list_for_each_entry(rdtg, &rdt_all_groups, rdtgroup_list) { 792e79f15a4SChen Yu struct rdtgroup *crg; 793e79f15a4SChen Yu 794e79f15a4SChen Yu /* 795e79f15a4SChen Yu * Task information is only relevant for shareable 796e79f15a4SChen Yu * and exclusive groups. 797e79f15a4SChen Yu */ 798e79f15a4SChen Yu if (rdtg->mode != RDT_MODE_SHAREABLE && 799e79f15a4SChen Yu rdtg->mode != RDT_MODE_EXCLUSIVE) 800e79f15a4SChen Yu continue; 801e79f15a4SChen Yu 802e79f15a4SChen Yu if (rdtg->closid != tsk->closid) 803e79f15a4SChen Yu continue; 804e79f15a4SChen Yu 805e79f15a4SChen Yu seq_printf(s, "res:%s%s\n", (rdtg == &rdtgroup_default) ? "/" : "", 806e79f15a4SChen Yu rdtg->kn->name); 807e79f15a4SChen Yu seq_puts(s, "mon:"); 808e79f15a4SChen Yu list_for_each_entry(crg, &rdtg->mon.crdtgrp_list, 809e79f15a4SChen Yu mon.crdtgrp_list) { 810e79f15a4SChen Yu if (tsk->rmid != crg->mon.rmid) 811e79f15a4SChen Yu continue; 812e79f15a4SChen Yu seq_printf(s, "%s", crg->kn->name); 813e79f15a4SChen Yu break; 814e79f15a4SChen Yu } 815e79f15a4SChen Yu seq_putc(s, '\n'); 816e79f15a4SChen Yu goto unlock; 817e79f15a4SChen Yu } 818e79f15a4SChen Yu /* 819e79f15a4SChen Yu * The above search should succeed. Otherwise return 820e79f15a4SChen Yu * with an error. 821e79f15a4SChen Yu */ 822e79f15a4SChen Yu ret = -ENOENT; 823e79f15a4SChen Yu unlock: 824e79f15a4SChen Yu mutex_unlock(&rdtgroup_mutex); 825e79f15a4SChen Yu 826e79f15a4SChen Yu return ret; 827e79f15a4SChen Yu } 828e79f15a4SChen Yu #endif 829e79f15a4SChen Yu 830fa7d9493SBabu Moger static int rdt_last_cmd_status_show(struct kernfs_open_file *of, 831fa7d9493SBabu Moger struct seq_file *seq, void *v) 832fa7d9493SBabu Moger { 833fa7d9493SBabu Moger int len; 834fa7d9493SBabu Moger 835fa7d9493SBabu Moger mutex_lock(&rdtgroup_mutex); 836fa7d9493SBabu Moger len = seq_buf_used(&last_cmd_status); 837fa7d9493SBabu Moger if (len) 838fa7d9493SBabu Moger seq_printf(seq, "%.*s", len, last_cmd_status_buf); 839fa7d9493SBabu Moger else 840fa7d9493SBabu Moger seq_puts(seq, "ok\n"); 841fa7d9493SBabu Moger mutex_unlock(&rdtgroup_mutex); 842fa7d9493SBabu Moger return 0; 843fa7d9493SBabu Moger } 844fa7d9493SBabu Moger 845fa7d9493SBabu Moger static int rdt_num_closids_show(struct kernfs_open_file *of, 846fa7d9493SBabu Moger struct seq_file *seq, void *v) 847fa7d9493SBabu Moger { 848f2594492SJames Morse struct resctrl_schema *s = of->kn->parent->priv; 849fa7d9493SBabu Moger 8503183e87cSJames Morse seq_printf(seq, "%u\n", s->num_closid); 851fa7d9493SBabu Moger return 0; 852fa7d9493SBabu Moger } 853fa7d9493SBabu Moger 854fa7d9493SBabu Moger static int rdt_default_ctrl_show(struct kernfs_open_file *of, 855fa7d9493SBabu Moger struct seq_file *seq, void *v) 856fa7d9493SBabu Moger { 857f2594492SJames Morse struct resctrl_schema *s = of->kn->parent->priv; 858f2594492SJames Morse struct rdt_resource *r = s->res; 859fa7d9493SBabu Moger 860fa7d9493SBabu Moger seq_printf(seq, "%x\n", r->default_ctrl); 861fa7d9493SBabu Moger return 0; 862fa7d9493SBabu Moger } 863fa7d9493SBabu Moger 864fa7d9493SBabu Moger static int rdt_min_cbm_bits_show(struct kernfs_open_file *of, 865fa7d9493SBabu Moger struct seq_file *seq, void *v) 866fa7d9493SBabu Moger { 867f2594492SJames Morse struct resctrl_schema *s = of->kn->parent->priv; 868f2594492SJames Morse struct rdt_resource *r = s->res; 869fa7d9493SBabu Moger 870fa7d9493SBabu Moger seq_printf(seq, "%u\n", r->cache.min_cbm_bits); 871fa7d9493SBabu Moger return 0; 872fa7d9493SBabu Moger } 873fa7d9493SBabu Moger 874fa7d9493SBabu Moger static int rdt_shareable_bits_show(struct kernfs_open_file *of, 875fa7d9493SBabu Moger struct seq_file *seq, void *v) 876fa7d9493SBabu Moger { 877f2594492SJames Morse struct resctrl_schema *s = of->kn->parent->priv; 878f2594492SJames Morse struct rdt_resource *r = s->res; 879fa7d9493SBabu Moger 880fa7d9493SBabu Moger seq_printf(seq, "%x\n", r->cache.shareable_bits); 881fa7d9493SBabu Moger return 0; 882fa7d9493SBabu Moger } 883fa7d9493SBabu Moger 884fa7d9493SBabu Moger /** 885fa7d9493SBabu Moger * rdt_bit_usage_show - Display current usage of resources 886fa7d9493SBabu Moger * 887fa7d9493SBabu Moger * A domain is a shared resource that can now be allocated differently. Here 888fa7d9493SBabu Moger * we display the current regions of the domain as an annotated bitmask. 889fa7d9493SBabu Moger * For each domain of this resource its allocation bitmask 890fa7d9493SBabu Moger * is annotated as below to indicate the current usage of the corresponding bit: 891fa7d9493SBabu Moger * 0 - currently unused 892fa7d9493SBabu Moger * X - currently available for sharing and used by software and hardware 893fa7d9493SBabu Moger * H - currently used by hardware only but available for software use 894fa7d9493SBabu Moger * S - currently used and shareable by software only 895fa7d9493SBabu Moger * E - currently used exclusively by one resource group 896fa7d9493SBabu Moger * P - currently pseudo-locked by one resource group 897fa7d9493SBabu Moger */ 898fa7d9493SBabu Moger static int rdt_bit_usage_show(struct kernfs_open_file *of, 899fa7d9493SBabu Moger struct seq_file *seq, void *v) 900fa7d9493SBabu Moger { 901f2594492SJames Morse struct resctrl_schema *s = of->kn->parent->priv; 90232f010deSReinette Chatre /* 90332f010deSReinette Chatre * Use unsigned long even though only 32 bits are used to ensure 90432f010deSReinette Chatre * test_bit() is used safely. 90532f010deSReinette Chatre */ 90632f010deSReinette Chatre unsigned long sw_shareable = 0, hw_shareable = 0; 90732f010deSReinette Chatre unsigned long exclusive = 0, pseudo_locked = 0; 908f2594492SJames Morse struct rdt_resource *r = s->res; 909fa7d9493SBabu Moger struct rdt_domain *dom; 910fa7d9493SBabu Moger int i, hwb, swb, excl, psl; 911fa7d9493SBabu Moger enum rdtgrp_mode mode; 912fa7d9493SBabu Moger bool sep = false; 913f07e9d02SJames Morse u32 ctrl_val; 914fa7d9493SBabu Moger 915fa7d9493SBabu Moger mutex_lock(&rdtgroup_mutex); 916fa7d9493SBabu Moger hw_shareable = r->cache.shareable_bits; 917fa7d9493SBabu Moger list_for_each_entry(dom, &r->domains, list) { 918fa7d9493SBabu Moger if (sep) 919fa7d9493SBabu Moger seq_putc(seq, ';'); 920fa7d9493SBabu Moger sw_shareable = 0; 921fa7d9493SBabu Moger exclusive = 0; 922fa7d9493SBabu Moger seq_printf(seq, "%d=", dom->id); 923f07e9d02SJames Morse for (i = 0; i < closids_supported(); i++) { 924fa7d9493SBabu Moger if (!closid_allocated(i)) 925fa7d9493SBabu Moger continue; 926111136e6SJames Morse ctrl_val = resctrl_arch_get_config(r, dom, i, 927111136e6SJames Morse s->conf_type); 928fa7d9493SBabu Moger mode = rdtgroup_mode_by_closid(i); 929fa7d9493SBabu Moger switch (mode) { 930fa7d9493SBabu Moger case RDT_MODE_SHAREABLE: 931f07e9d02SJames Morse sw_shareable |= ctrl_val; 932fa7d9493SBabu Moger break; 933fa7d9493SBabu Moger case RDT_MODE_EXCLUSIVE: 934f07e9d02SJames Morse exclusive |= ctrl_val; 935fa7d9493SBabu Moger break; 936fa7d9493SBabu Moger case RDT_MODE_PSEUDO_LOCKSETUP: 937fa7d9493SBabu Moger /* 938fa7d9493SBabu Moger * RDT_MODE_PSEUDO_LOCKSETUP is possible 939fa7d9493SBabu Moger * here but not included since the CBM 940fa7d9493SBabu Moger * associated with this CLOSID in this mode 941fa7d9493SBabu Moger * is not initialized and no task or cpu can be 942fa7d9493SBabu Moger * assigned this CLOSID. 943fa7d9493SBabu Moger */ 944fa7d9493SBabu Moger break; 945fa7d9493SBabu Moger case RDT_MODE_PSEUDO_LOCKED: 946fa7d9493SBabu Moger case RDT_NUM_MODES: 947fa7d9493SBabu Moger WARN(1, 948fa7d9493SBabu Moger "invalid mode for closid %d\n", i); 949fa7d9493SBabu Moger break; 950fa7d9493SBabu Moger } 951fa7d9493SBabu Moger } 952fa7d9493SBabu Moger for (i = r->cache.cbm_len - 1; i >= 0; i--) { 953fa7d9493SBabu Moger pseudo_locked = dom->plr ? dom->plr->cbm : 0; 95432f010deSReinette Chatre hwb = test_bit(i, &hw_shareable); 95532f010deSReinette Chatre swb = test_bit(i, &sw_shareable); 95632f010deSReinette Chatre excl = test_bit(i, &exclusive); 95732f010deSReinette Chatre psl = test_bit(i, &pseudo_locked); 958fa7d9493SBabu Moger if (hwb && swb) 959fa7d9493SBabu Moger seq_putc(seq, 'X'); 960fa7d9493SBabu Moger else if (hwb && !swb) 961fa7d9493SBabu Moger seq_putc(seq, 'H'); 962fa7d9493SBabu Moger else if (!hwb && swb) 963fa7d9493SBabu Moger seq_putc(seq, 'S'); 964fa7d9493SBabu Moger else if (excl) 965fa7d9493SBabu Moger seq_putc(seq, 'E'); 966fa7d9493SBabu Moger else if (psl) 967fa7d9493SBabu Moger seq_putc(seq, 'P'); 968fa7d9493SBabu Moger else /* Unused bits remain */ 969fa7d9493SBabu Moger seq_putc(seq, '0'); 970fa7d9493SBabu Moger } 971fa7d9493SBabu Moger sep = true; 972fa7d9493SBabu Moger } 973fa7d9493SBabu Moger seq_putc(seq, '\n'); 974fa7d9493SBabu Moger mutex_unlock(&rdtgroup_mutex); 975fa7d9493SBabu Moger return 0; 976fa7d9493SBabu Moger } 977fa7d9493SBabu Moger 978fa7d9493SBabu Moger static int rdt_min_bw_show(struct kernfs_open_file *of, 979fa7d9493SBabu Moger struct seq_file *seq, void *v) 980fa7d9493SBabu Moger { 981f2594492SJames Morse struct resctrl_schema *s = of->kn->parent->priv; 982f2594492SJames Morse struct rdt_resource *r = s->res; 983fa7d9493SBabu Moger 984fa7d9493SBabu Moger seq_printf(seq, "%u\n", r->membw.min_bw); 985fa7d9493SBabu Moger return 0; 986fa7d9493SBabu Moger } 987fa7d9493SBabu Moger 988fa7d9493SBabu Moger static int rdt_num_rmids_show(struct kernfs_open_file *of, 989fa7d9493SBabu Moger struct seq_file *seq, void *v) 990fa7d9493SBabu Moger { 991fa7d9493SBabu Moger struct rdt_resource *r = of->kn->parent->priv; 992fa7d9493SBabu Moger 993fa7d9493SBabu Moger seq_printf(seq, "%d\n", r->num_rmid); 994fa7d9493SBabu Moger 995fa7d9493SBabu Moger return 0; 996fa7d9493SBabu Moger } 997fa7d9493SBabu Moger 998fa7d9493SBabu Moger static int rdt_mon_features_show(struct kernfs_open_file *of, 999fa7d9493SBabu Moger struct seq_file *seq, void *v) 1000fa7d9493SBabu Moger { 1001fa7d9493SBabu Moger struct rdt_resource *r = of->kn->parent->priv; 1002fa7d9493SBabu Moger struct mon_evt *mevt; 1003fa7d9493SBabu Moger 1004fa7d9493SBabu Moger list_for_each_entry(mevt, &r->evt_list, list) 1005fa7d9493SBabu Moger seq_printf(seq, "%s\n", mevt->name); 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 { 1033*ae2328b5SJames 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 1062fa7d9493SBabu Moger if (bytes > (boot_cpu_data.x86_cache_size * 1024)) 1063fa7d9493SBabu Moger return -EINVAL; 1064fa7d9493SBabu Moger 1065*ae2328b5SJames 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; 1216fa7d9493SBabu Moger if (r->rid == RDT_RESOURCE_MBA) 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); 1405fa7d9493SBabu Moger if (r->rid == RDT_RESOURCE_MBA) 1406fa7d9493SBabu Moger size = ctrl; 1407fa7d9493SBabu Moger else 1408fa7d9493SBabu Moger size = rdtgroup_cbm_to_size(r, d, ctrl); 1409fa7d9493SBabu Moger } 1410fa7d9493SBabu Moger seq_printf(s, "%d=%u", d->id, size); 1411fa7d9493SBabu Moger sep = true; 1412fa7d9493SBabu Moger } 1413fa7d9493SBabu Moger seq_putc(s, '\n'); 1414fa7d9493SBabu Moger } 1415fa7d9493SBabu Moger 1416fa7d9493SBabu Moger out: 1417fa7d9493SBabu Moger rdtgroup_kn_unlock(of->kn); 1418fa7d9493SBabu Moger 1419fa7d9493SBabu Moger return ret; 1420fa7d9493SBabu Moger } 1421fa7d9493SBabu Moger 1422fa7d9493SBabu Moger /* rdtgroup information files for one cache resource. */ 1423fa7d9493SBabu Moger static struct rftype res_common_files[] = { 1424fa7d9493SBabu Moger { 1425fa7d9493SBabu Moger .name = "last_cmd_status", 1426fa7d9493SBabu Moger .mode = 0444, 1427fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1428fa7d9493SBabu Moger .seq_show = rdt_last_cmd_status_show, 1429fa7d9493SBabu Moger .fflags = RF_TOP_INFO, 1430fa7d9493SBabu Moger }, 1431fa7d9493SBabu Moger { 1432fa7d9493SBabu Moger .name = "num_closids", 1433fa7d9493SBabu Moger .mode = 0444, 1434fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1435fa7d9493SBabu Moger .seq_show = rdt_num_closids_show, 1436fa7d9493SBabu Moger .fflags = RF_CTRL_INFO, 1437fa7d9493SBabu Moger }, 1438fa7d9493SBabu Moger { 1439fa7d9493SBabu Moger .name = "mon_features", 1440fa7d9493SBabu Moger .mode = 0444, 1441fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1442fa7d9493SBabu Moger .seq_show = rdt_mon_features_show, 1443fa7d9493SBabu Moger .fflags = RF_MON_INFO, 1444fa7d9493SBabu Moger }, 1445fa7d9493SBabu Moger { 1446fa7d9493SBabu Moger .name = "num_rmids", 1447fa7d9493SBabu Moger .mode = 0444, 1448fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1449fa7d9493SBabu Moger .seq_show = rdt_num_rmids_show, 1450fa7d9493SBabu Moger .fflags = RF_MON_INFO, 1451fa7d9493SBabu Moger }, 1452fa7d9493SBabu Moger { 1453fa7d9493SBabu Moger .name = "cbm_mask", 1454fa7d9493SBabu Moger .mode = 0444, 1455fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1456fa7d9493SBabu Moger .seq_show = rdt_default_ctrl_show, 1457fa7d9493SBabu Moger .fflags = RF_CTRL_INFO | RFTYPE_RES_CACHE, 1458fa7d9493SBabu Moger }, 1459fa7d9493SBabu Moger { 1460fa7d9493SBabu Moger .name = "min_cbm_bits", 1461fa7d9493SBabu Moger .mode = 0444, 1462fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1463fa7d9493SBabu Moger .seq_show = rdt_min_cbm_bits_show, 1464fa7d9493SBabu Moger .fflags = RF_CTRL_INFO | RFTYPE_RES_CACHE, 1465fa7d9493SBabu Moger }, 1466fa7d9493SBabu Moger { 1467fa7d9493SBabu Moger .name = "shareable_bits", 1468fa7d9493SBabu Moger .mode = 0444, 1469fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1470fa7d9493SBabu Moger .seq_show = rdt_shareable_bits_show, 1471fa7d9493SBabu Moger .fflags = RF_CTRL_INFO | RFTYPE_RES_CACHE, 1472fa7d9493SBabu Moger }, 1473fa7d9493SBabu Moger { 1474fa7d9493SBabu Moger .name = "bit_usage", 1475fa7d9493SBabu Moger .mode = 0444, 1476fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1477fa7d9493SBabu Moger .seq_show = rdt_bit_usage_show, 1478fa7d9493SBabu Moger .fflags = RF_CTRL_INFO | RFTYPE_RES_CACHE, 1479fa7d9493SBabu Moger }, 1480fa7d9493SBabu Moger { 1481fa7d9493SBabu Moger .name = "min_bandwidth", 1482fa7d9493SBabu Moger .mode = 0444, 1483fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1484fa7d9493SBabu Moger .seq_show = rdt_min_bw_show, 1485fa7d9493SBabu Moger .fflags = RF_CTRL_INFO | RFTYPE_RES_MB, 1486fa7d9493SBabu Moger }, 1487fa7d9493SBabu Moger { 1488fa7d9493SBabu Moger .name = "bandwidth_gran", 1489fa7d9493SBabu Moger .mode = 0444, 1490fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1491fa7d9493SBabu Moger .seq_show = rdt_bw_gran_show, 1492fa7d9493SBabu Moger .fflags = RF_CTRL_INFO | RFTYPE_RES_MB, 1493fa7d9493SBabu Moger }, 1494fa7d9493SBabu Moger { 1495fa7d9493SBabu Moger .name = "delay_linear", 1496fa7d9493SBabu Moger .mode = 0444, 1497fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1498fa7d9493SBabu Moger .seq_show = rdt_delay_linear_show, 1499fa7d9493SBabu Moger .fflags = RF_CTRL_INFO | RFTYPE_RES_MB, 1500fa7d9493SBabu Moger }, 150129b6bd41SFenghua Yu /* 150229b6bd41SFenghua Yu * Platform specific which (if any) capabilities are provided by 150329b6bd41SFenghua Yu * thread_throttle_mode. Defer "fflags" initialization to platform 150429b6bd41SFenghua Yu * discovery. 150529b6bd41SFenghua Yu */ 150629b6bd41SFenghua Yu { 150729b6bd41SFenghua Yu .name = "thread_throttle_mode", 150829b6bd41SFenghua Yu .mode = 0444, 150929b6bd41SFenghua Yu .kf_ops = &rdtgroup_kf_single_ops, 151029b6bd41SFenghua Yu .seq_show = rdt_thread_throttle_mode_show, 151129b6bd41SFenghua Yu }, 1512fa7d9493SBabu Moger { 1513fa7d9493SBabu Moger .name = "max_threshold_occupancy", 1514fa7d9493SBabu Moger .mode = 0644, 1515fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1516fa7d9493SBabu Moger .write = max_threshold_occ_write, 1517fa7d9493SBabu Moger .seq_show = max_threshold_occ_show, 1518fa7d9493SBabu Moger .fflags = RF_MON_INFO | RFTYPE_RES_CACHE, 1519fa7d9493SBabu Moger }, 1520fa7d9493SBabu Moger { 1521fa7d9493SBabu Moger .name = "cpus", 1522fa7d9493SBabu Moger .mode = 0644, 1523fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1524fa7d9493SBabu Moger .write = rdtgroup_cpus_write, 1525fa7d9493SBabu Moger .seq_show = rdtgroup_cpus_show, 1526fa7d9493SBabu Moger .fflags = RFTYPE_BASE, 1527fa7d9493SBabu Moger }, 1528fa7d9493SBabu Moger { 1529fa7d9493SBabu Moger .name = "cpus_list", 1530fa7d9493SBabu Moger .mode = 0644, 1531fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1532fa7d9493SBabu Moger .write = rdtgroup_cpus_write, 1533fa7d9493SBabu Moger .seq_show = rdtgroup_cpus_show, 1534fa7d9493SBabu Moger .flags = RFTYPE_FLAGS_CPUS_LIST, 1535fa7d9493SBabu Moger .fflags = RFTYPE_BASE, 1536fa7d9493SBabu Moger }, 1537fa7d9493SBabu Moger { 1538fa7d9493SBabu Moger .name = "tasks", 1539fa7d9493SBabu Moger .mode = 0644, 1540fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1541fa7d9493SBabu Moger .write = rdtgroup_tasks_write, 1542fa7d9493SBabu Moger .seq_show = rdtgroup_tasks_show, 1543fa7d9493SBabu Moger .fflags = RFTYPE_BASE, 1544fa7d9493SBabu Moger }, 1545fa7d9493SBabu Moger { 1546fa7d9493SBabu Moger .name = "schemata", 1547fa7d9493SBabu Moger .mode = 0644, 1548fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1549fa7d9493SBabu Moger .write = rdtgroup_schemata_write, 1550fa7d9493SBabu Moger .seq_show = rdtgroup_schemata_show, 1551fa7d9493SBabu Moger .fflags = RF_CTRL_BASE, 1552fa7d9493SBabu Moger }, 1553fa7d9493SBabu Moger { 1554fa7d9493SBabu Moger .name = "mode", 1555fa7d9493SBabu Moger .mode = 0644, 1556fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1557fa7d9493SBabu Moger .write = rdtgroup_mode_write, 1558fa7d9493SBabu Moger .seq_show = rdtgroup_mode_show, 1559fa7d9493SBabu Moger .fflags = RF_CTRL_BASE, 1560fa7d9493SBabu Moger }, 1561fa7d9493SBabu Moger { 1562fa7d9493SBabu Moger .name = "size", 1563fa7d9493SBabu Moger .mode = 0444, 1564fa7d9493SBabu Moger .kf_ops = &rdtgroup_kf_single_ops, 1565fa7d9493SBabu Moger .seq_show = rdtgroup_size_show, 1566fa7d9493SBabu Moger .fflags = RF_CTRL_BASE, 1567fa7d9493SBabu Moger }, 1568fa7d9493SBabu Moger 1569fa7d9493SBabu Moger }; 1570fa7d9493SBabu Moger 1571fa7d9493SBabu Moger static int rdtgroup_add_files(struct kernfs_node *kn, unsigned long fflags) 1572fa7d9493SBabu Moger { 1573fa7d9493SBabu Moger struct rftype *rfts, *rft; 1574fa7d9493SBabu Moger int ret, len; 1575fa7d9493SBabu Moger 1576fa7d9493SBabu Moger rfts = res_common_files; 1577fa7d9493SBabu Moger len = ARRAY_SIZE(res_common_files); 1578fa7d9493SBabu Moger 1579fa7d9493SBabu Moger lockdep_assert_held(&rdtgroup_mutex); 1580fa7d9493SBabu Moger 1581fa7d9493SBabu Moger for (rft = rfts; rft < rfts + len; rft++) { 158229b6bd41SFenghua Yu if (rft->fflags && ((fflags & rft->fflags) == rft->fflags)) { 1583fa7d9493SBabu Moger ret = rdtgroup_add_file(kn, rft); 1584fa7d9493SBabu Moger if (ret) 1585fa7d9493SBabu Moger goto error; 1586fa7d9493SBabu Moger } 1587fa7d9493SBabu Moger } 1588fa7d9493SBabu Moger 1589fa7d9493SBabu Moger return 0; 1590fa7d9493SBabu Moger error: 1591fa7d9493SBabu Moger pr_warn("Failed to add %s, err=%d\n", rft->name, ret); 1592fa7d9493SBabu Moger while (--rft >= rfts) { 1593fa7d9493SBabu Moger if ((fflags & rft->fflags) == rft->fflags) 1594fa7d9493SBabu Moger kernfs_remove_by_name(kn, rft->name); 1595fa7d9493SBabu Moger } 1596fa7d9493SBabu Moger return ret; 1597fa7d9493SBabu Moger } 1598fa7d9493SBabu Moger 159929b6bd41SFenghua Yu static struct rftype *rdtgroup_get_rftype_by_name(const char *name) 160029b6bd41SFenghua Yu { 160129b6bd41SFenghua Yu struct rftype *rfts, *rft; 160229b6bd41SFenghua Yu int len; 160329b6bd41SFenghua Yu 160429b6bd41SFenghua Yu rfts = res_common_files; 160529b6bd41SFenghua Yu len = ARRAY_SIZE(res_common_files); 160629b6bd41SFenghua Yu 160729b6bd41SFenghua Yu for (rft = rfts; rft < rfts + len; rft++) { 160829b6bd41SFenghua Yu if (!strcmp(rft->name, name)) 160929b6bd41SFenghua Yu return rft; 161029b6bd41SFenghua Yu } 161129b6bd41SFenghua Yu 161229b6bd41SFenghua Yu return NULL; 161329b6bd41SFenghua Yu } 161429b6bd41SFenghua Yu 161529b6bd41SFenghua Yu void __init thread_throttle_mode_init(void) 161629b6bd41SFenghua Yu { 161729b6bd41SFenghua Yu struct rftype *rft; 161829b6bd41SFenghua Yu 161929b6bd41SFenghua Yu rft = rdtgroup_get_rftype_by_name("thread_throttle_mode"); 162029b6bd41SFenghua Yu if (!rft) 162129b6bd41SFenghua Yu return; 162229b6bd41SFenghua Yu 162329b6bd41SFenghua Yu rft->fflags = RF_CTRL_INFO | RFTYPE_RES_MB; 162429b6bd41SFenghua Yu } 162529b6bd41SFenghua Yu 1626fa7d9493SBabu Moger /** 1627fa7d9493SBabu Moger * rdtgroup_kn_mode_restrict - Restrict user access to named resctrl file 1628fa7d9493SBabu Moger * @r: The resource group with which the file is associated. 1629fa7d9493SBabu Moger * @name: Name of the file 1630fa7d9493SBabu Moger * 1631fa7d9493SBabu Moger * The permissions of named resctrl file, directory, or link are modified 1632fa7d9493SBabu Moger * to not allow read, write, or execute by any user. 1633fa7d9493SBabu Moger * 1634fa7d9493SBabu Moger * WARNING: This function is intended to communicate to the user that the 1635fa7d9493SBabu Moger * resctrl file has been locked down - that it is not relevant to the 1636fa7d9493SBabu Moger * particular state the system finds itself in. It should not be relied 1637fa7d9493SBabu Moger * on to protect from user access because after the file's permissions 1638fa7d9493SBabu Moger * are restricted the user can still change the permissions using chmod 1639fa7d9493SBabu Moger * from the command line. 1640fa7d9493SBabu Moger * 1641fa7d9493SBabu Moger * Return: 0 on success, <0 on failure. 1642fa7d9493SBabu Moger */ 1643fa7d9493SBabu Moger int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name) 1644fa7d9493SBabu Moger { 1645fa7d9493SBabu Moger struct iattr iattr = {.ia_valid = ATTR_MODE,}; 1646fa7d9493SBabu Moger struct kernfs_node *kn; 1647fa7d9493SBabu Moger int ret = 0; 1648fa7d9493SBabu Moger 1649fa7d9493SBabu Moger kn = kernfs_find_and_get_ns(r->kn, name, NULL); 1650fa7d9493SBabu Moger if (!kn) 1651fa7d9493SBabu Moger return -ENOENT; 1652fa7d9493SBabu Moger 1653fa7d9493SBabu Moger switch (kernfs_type(kn)) { 1654fa7d9493SBabu Moger case KERNFS_DIR: 1655fa7d9493SBabu Moger iattr.ia_mode = S_IFDIR; 1656fa7d9493SBabu Moger break; 1657fa7d9493SBabu Moger case KERNFS_FILE: 1658fa7d9493SBabu Moger iattr.ia_mode = S_IFREG; 1659fa7d9493SBabu Moger break; 1660fa7d9493SBabu Moger case KERNFS_LINK: 1661fa7d9493SBabu Moger iattr.ia_mode = S_IFLNK; 1662fa7d9493SBabu Moger break; 1663fa7d9493SBabu Moger } 1664fa7d9493SBabu Moger 1665fa7d9493SBabu Moger ret = kernfs_setattr(kn, &iattr); 1666fa7d9493SBabu Moger kernfs_put(kn); 1667fa7d9493SBabu Moger return ret; 1668fa7d9493SBabu Moger } 1669fa7d9493SBabu Moger 1670fa7d9493SBabu Moger /** 1671fa7d9493SBabu Moger * rdtgroup_kn_mode_restore - Restore user access to named resctrl file 1672fa7d9493SBabu Moger * @r: The resource group with which the file is associated. 1673fa7d9493SBabu Moger * @name: Name of the file 1674fa7d9493SBabu Moger * @mask: Mask of permissions that should be restored 1675fa7d9493SBabu Moger * 1676fa7d9493SBabu Moger * Restore the permissions of the named file. If @name is a directory the 1677fa7d9493SBabu Moger * permissions of its parent will be used. 1678fa7d9493SBabu Moger * 1679fa7d9493SBabu Moger * Return: 0 on success, <0 on failure. 1680fa7d9493SBabu Moger */ 1681fa7d9493SBabu Moger int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name, 1682fa7d9493SBabu Moger umode_t mask) 1683fa7d9493SBabu Moger { 1684fa7d9493SBabu Moger struct iattr iattr = {.ia_valid = ATTR_MODE,}; 1685fa7d9493SBabu Moger struct kernfs_node *kn, *parent; 1686fa7d9493SBabu Moger struct rftype *rfts, *rft; 1687fa7d9493SBabu Moger int ret, len; 1688fa7d9493SBabu Moger 1689fa7d9493SBabu Moger rfts = res_common_files; 1690fa7d9493SBabu Moger len = ARRAY_SIZE(res_common_files); 1691fa7d9493SBabu Moger 1692fa7d9493SBabu Moger for (rft = rfts; rft < rfts + len; rft++) { 1693fa7d9493SBabu Moger if (!strcmp(rft->name, name)) 1694fa7d9493SBabu Moger iattr.ia_mode = rft->mode & mask; 1695fa7d9493SBabu Moger } 1696fa7d9493SBabu Moger 1697fa7d9493SBabu Moger kn = kernfs_find_and_get_ns(r->kn, name, NULL); 1698fa7d9493SBabu Moger if (!kn) 1699fa7d9493SBabu Moger return -ENOENT; 1700fa7d9493SBabu Moger 1701fa7d9493SBabu Moger switch (kernfs_type(kn)) { 1702fa7d9493SBabu Moger case KERNFS_DIR: 1703fa7d9493SBabu Moger parent = kernfs_get_parent(kn); 1704fa7d9493SBabu Moger if (parent) { 1705fa7d9493SBabu Moger iattr.ia_mode |= parent->mode; 1706fa7d9493SBabu Moger kernfs_put(parent); 1707fa7d9493SBabu Moger } 1708fa7d9493SBabu Moger iattr.ia_mode |= S_IFDIR; 1709fa7d9493SBabu Moger break; 1710fa7d9493SBabu Moger case KERNFS_FILE: 1711fa7d9493SBabu Moger iattr.ia_mode |= S_IFREG; 1712fa7d9493SBabu Moger break; 1713fa7d9493SBabu Moger case KERNFS_LINK: 1714fa7d9493SBabu Moger iattr.ia_mode |= S_IFLNK; 1715fa7d9493SBabu Moger break; 1716fa7d9493SBabu Moger } 1717fa7d9493SBabu Moger 1718fa7d9493SBabu Moger ret = kernfs_setattr(kn, &iattr); 1719fa7d9493SBabu Moger kernfs_put(kn); 1720fa7d9493SBabu Moger return ret; 1721fa7d9493SBabu Moger } 1722fa7d9493SBabu Moger 1723f2594492SJames Morse static int rdtgroup_mkdir_info_resdir(void *priv, char *name, 1724fa7d9493SBabu Moger unsigned long fflags) 1725fa7d9493SBabu Moger { 1726fa7d9493SBabu Moger struct kernfs_node *kn_subdir; 1727fa7d9493SBabu Moger int ret; 1728fa7d9493SBabu Moger 1729fa7d9493SBabu Moger kn_subdir = kernfs_create_dir(kn_info, name, 1730f2594492SJames Morse kn_info->mode, priv); 1731fa7d9493SBabu Moger if (IS_ERR(kn_subdir)) 1732fa7d9493SBabu Moger return PTR_ERR(kn_subdir); 1733fa7d9493SBabu Moger 1734fa7d9493SBabu Moger ret = rdtgroup_kn_set_ugid(kn_subdir); 1735fa7d9493SBabu Moger if (ret) 1736fa7d9493SBabu Moger return ret; 1737fa7d9493SBabu Moger 1738fa7d9493SBabu Moger ret = rdtgroup_add_files(kn_subdir, fflags); 1739fa7d9493SBabu Moger if (!ret) 1740fa7d9493SBabu Moger kernfs_activate(kn_subdir); 1741fa7d9493SBabu Moger 1742fa7d9493SBabu Moger return ret; 1743fa7d9493SBabu Moger } 1744fa7d9493SBabu Moger 1745fa7d9493SBabu Moger static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn) 1746fa7d9493SBabu Moger { 1747f2594492SJames Morse struct resctrl_schema *s; 1748fa7d9493SBabu Moger struct rdt_resource *r; 1749fa7d9493SBabu Moger unsigned long fflags; 1750fa7d9493SBabu Moger char name[32]; 1751fa7d9493SBabu Moger int ret; 1752fa7d9493SBabu Moger 1753fa7d9493SBabu Moger /* create the directory */ 1754fa7d9493SBabu Moger kn_info = kernfs_create_dir(parent_kn, "info", parent_kn->mode, NULL); 1755fa7d9493SBabu Moger if (IS_ERR(kn_info)) 1756fa7d9493SBabu Moger return PTR_ERR(kn_info); 1757fa7d9493SBabu Moger 1758fa7d9493SBabu Moger ret = rdtgroup_add_files(kn_info, RF_TOP_INFO); 1759fa7d9493SBabu Moger if (ret) 1760fa7d9493SBabu Moger goto out_destroy; 1761fa7d9493SBabu Moger 17624d269ed4SJames Morse /* loop over enabled controls, these are all alloc_capable */ 1763f2594492SJames Morse list_for_each_entry(s, &resctrl_schema_all, list) { 1764f2594492SJames Morse r = s->res; 1765fa7d9493SBabu Moger fflags = r->fflags | RF_CTRL_INFO; 1766e198fde3SJames Morse ret = rdtgroup_mkdir_info_resdir(s, s->name, fflags); 1767fa7d9493SBabu Moger if (ret) 1768fa7d9493SBabu Moger goto out_destroy; 1769fa7d9493SBabu Moger } 1770fa7d9493SBabu Moger 1771bab6ee73SJames Morse for_each_mon_capable_rdt_resource(r) { 1772fa7d9493SBabu Moger fflags = r->fflags | RF_MON_INFO; 1773fa7d9493SBabu Moger sprintf(name, "%s_MON", r->name); 1774fa7d9493SBabu Moger ret = rdtgroup_mkdir_info_resdir(r, name, fflags); 1775fa7d9493SBabu Moger if (ret) 1776fa7d9493SBabu Moger goto out_destroy; 1777fa7d9493SBabu Moger } 1778fa7d9493SBabu Moger 1779fa7d9493SBabu Moger ret = rdtgroup_kn_set_ugid(kn_info); 1780fa7d9493SBabu Moger if (ret) 1781fa7d9493SBabu Moger goto out_destroy; 1782fa7d9493SBabu Moger 1783fa7d9493SBabu Moger kernfs_activate(kn_info); 1784fa7d9493SBabu Moger 1785fa7d9493SBabu Moger return 0; 1786fa7d9493SBabu Moger 1787fa7d9493SBabu Moger out_destroy: 1788fa7d9493SBabu Moger kernfs_remove(kn_info); 1789fa7d9493SBabu Moger return ret; 1790fa7d9493SBabu Moger } 1791fa7d9493SBabu Moger 1792fa7d9493SBabu Moger static int 1793fa7d9493SBabu Moger mongroup_create_dir(struct kernfs_node *parent_kn, struct rdtgroup *prgrp, 1794fa7d9493SBabu Moger char *name, struct kernfs_node **dest_kn) 1795fa7d9493SBabu Moger { 1796fa7d9493SBabu Moger struct kernfs_node *kn; 1797fa7d9493SBabu Moger int ret; 1798fa7d9493SBabu Moger 1799fa7d9493SBabu Moger /* create the directory */ 1800fa7d9493SBabu Moger kn = kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp); 1801fa7d9493SBabu Moger if (IS_ERR(kn)) 1802fa7d9493SBabu Moger return PTR_ERR(kn); 1803fa7d9493SBabu Moger 1804fa7d9493SBabu Moger if (dest_kn) 1805fa7d9493SBabu Moger *dest_kn = kn; 1806fa7d9493SBabu Moger 1807fa7d9493SBabu Moger ret = rdtgroup_kn_set_ugid(kn); 1808fa7d9493SBabu Moger if (ret) 1809fa7d9493SBabu Moger goto out_destroy; 1810fa7d9493SBabu Moger 1811fa7d9493SBabu Moger kernfs_activate(kn); 1812fa7d9493SBabu Moger 1813fa7d9493SBabu Moger return 0; 1814fa7d9493SBabu Moger 1815fa7d9493SBabu Moger out_destroy: 1816fa7d9493SBabu Moger kernfs_remove(kn); 1817fa7d9493SBabu Moger return ret; 1818fa7d9493SBabu Moger } 1819fa7d9493SBabu Moger 1820fa7d9493SBabu Moger static void l3_qos_cfg_update(void *arg) 1821fa7d9493SBabu Moger { 1822fa7d9493SBabu Moger bool *enable = arg; 1823fa7d9493SBabu Moger 1824aa50453aSBabu Moger wrmsrl(MSR_IA32_L3_QOS_CFG, *enable ? L3_QOS_CDP_ENABLE : 0ULL); 1825fa7d9493SBabu Moger } 1826fa7d9493SBabu Moger 1827fa7d9493SBabu Moger static void l2_qos_cfg_update(void *arg) 1828fa7d9493SBabu Moger { 1829fa7d9493SBabu Moger bool *enable = arg; 1830fa7d9493SBabu Moger 1831aa50453aSBabu Moger wrmsrl(MSR_IA32_L2_QOS_CFG, *enable ? L2_QOS_CDP_ENABLE : 0ULL); 1832fa7d9493SBabu Moger } 1833fa7d9493SBabu Moger 1834fa7d9493SBabu Moger static inline bool is_mba_linear(void) 1835fa7d9493SBabu Moger { 183663c8b123SJames Morse return rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl.membw.delay_linear; 1837fa7d9493SBabu Moger } 1838fa7d9493SBabu Moger 1839fa7d9493SBabu Moger static int set_cache_qos_cfg(int level, bool enable) 1840fa7d9493SBabu Moger { 1841fa7d9493SBabu Moger void (*update)(void *arg); 1842fa7d9493SBabu Moger struct rdt_resource *r_l; 1843fa7d9493SBabu Moger cpumask_var_t cpu_mask; 1844fa7d9493SBabu Moger struct rdt_domain *d; 1845fa7d9493SBabu Moger int cpu; 1846fa7d9493SBabu Moger 1847fa7d9493SBabu Moger if (level == RDT_RESOURCE_L3) 1848fa7d9493SBabu Moger update = l3_qos_cfg_update; 1849fa7d9493SBabu Moger else if (level == RDT_RESOURCE_L2) 1850fa7d9493SBabu Moger update = l2_qos_cfg_update; 1851fa7d9493SBabu Moger else 1852fa7d9493SBabu Moger return -EINVAL; 1853fa7d9493SBabu Moger 1854ab6a2114SShakeel Butt if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL)) 1855ab6a2114SShakeel Butt return -ENOMEM; 1856ab6a2114SShakeel Butt 185763c8b123SJames Morse r_l = &rdt_resources_all[level].r_resctrl; 1858fa7d9493SBabu Moger list_for_each_entry(d, &r_l->domains, list) { 1859fae3a13dSBabu Moger if (r_l->cache.arch_has_per_cpu_cfg) 1860fae3a13dSBabu Moger /* Pick all the CPUs in the domain instance */ 1861fae3a13dSBabu Moger for_each_cpu(cpu, &d->cpu_mask) 1862fae3a13dSBabu Moger cpumask_set_cpu(cpu, cpu_mask); 1863fae3a13dSBabu Moger else 1864fa7d9493SBabu Moger /* Pick one CPU from each domain instance to update MSR */ 1865fa7d9493SBabu Moger cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask); 1866fa7d9493SBabu Moger } 1867fa7d9493SBabu Moger cpu = get_cpu(); 1868fa7d9493SBabu Moger /* Update QOS_CFG MSR on this cpu if it's in cpu_mask. */ 1869fa7d9493SBabu Moger if (cpumask_test_cpu(cpu, cpu_mask)) 1870fa7d9493SBabu Moger update(&enable); 1871fa7d9493SBabu Moger /* Update QOS_CFG MSR on all other cpus in cpu_mask. */ 1872fa7d9493SBabu Moger smp_call_function_many(cpu_mask, update, &enable, 1); 1873fa7d9493SBabu Moger put_cpu(); 1874fa7d9493SBabu Moger 1875fa7d9493SBabu Moger free_cpumask_var(cpu_mask); 1876fa7d9493SBabu Moger 1877fa7d9493SBabu Moger return 0; 1878fa7d9493SBabu Moger } 1879fa7d9493SBabu Moger 18809fe04507SJames Morse /* Restore the qos cfg state when a domain comes online */ 18819fe04507SJames Morse void rdt_domain_reconfigure_cdp(struct rdt_resource *r) 18829fe04507SJames Morse { 1883c091e907SJames Morse struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r); 1884c091e907SJames Morse 1885c091e907SJames Morse if (!r->cdp_capable) 18869fe04507SJames Morse return; 18879fe04507SJames Morse 18885c3b63cdSJames Morse if (r->rid == RDT_RESOURCE_L2) 1889c091e907SJames Morse l2_qos_cfg_update(&hw_res->cdp_enabled); 18909fe04507SJames Morse 18915c3b63cdSJames Morse if (r->rid == RDT_RESOURCE_L3) 1892c091e907SJames Morse l3_qos_cfg_update(&hw_res->cdp_enabled); 18939fe04507SJames Morse } 18949fe04507SJames Morse 1895781096d9SJames Morse static int mba_sc_domain_allocate(struct rdt_resource *r, struct rdt_domain *d) 1896781096d9SJames Morse { 1897781096d9SJames Morse u32 num_closid = resctrl_arch_get_num_closid(r); 1898781096d9SJames Morse int cpu = cpumask_any(&d->cpu_mask); 1899781096d9SJames Morse int i; 1900781096d9SJames Morse 1901781096d9SJames Morse d->mbps_val = kcalloc_node(num_closid, sizeof(*d->mbps_val), 1902781096d9SJames Morse GFP_KERNEL, cpu_to_node(cpu)); 1903781096d9SJames Morse if (!d->mbps_val) 1904781096d9SJames Morse return -ENOMEM; 1905781096d9SJames Morse 1906781096d9SJames Morse for (i = 0; i < num_closid; i++) 1907781096d9SJames Morse d->mbps_val[i] = MBA_MAX_MBPS; 1908781096d9SJames Morse 1909781096d9SJames Morse return 0; 1910781096d9SJames Morse } 1911781096d9SJames Morse 1912781096d9SJames Morse static void mba_sc_domain_destroy(struct rdt_resource *r, 1913781096d9SJames Morse struct rdt_domain *d) 1914781096d9SJames Morse { 1915781096d9SJames Morse kfree(d->mbps_val); 1916781096d9SJames Morse d->mbps_val = NULL; 1917781096d9SJames Morse } 1918781096d9SJames Morse 1919fa7d9493SBabu Moger /* 1920fa7d9493SBabu Moger * MBA software controller is supported only if 1921fa7d9493SBabu Moger * MBM is supported and MBA is in linear scale. 1922fa7d9493SBabu Moger */ 1923b045c215SJames Morse static bool supports_mba_mbps(void) 1924b045c215SJames Morse { 1925b045c215SJames Morse struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl; 1926b045c215SJames Morse 1927b045c215SJames Morse return (is_mbm_local_enabled() && 1928b045c215SJames Morse r->alloc_capable && is_mba_linear()); 1929b045c215SJames Morse } 1930b045c215SJames Morse 1931b045c215SJames Morse /* 1932b045c215SJames Morse * Enable or disable the MBA software controller 1933b045c215SJames Morse * which helps user specify bandwidth in MBps. 1934b045c215SJames Morse */ 1935fa7d9493SBabu Moger static int set_mba_sc(bool mba_sc) 1936fa7d9493SBabu Moger { 193763c8b123SJames Morse struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl; 1938781096d9SJames Morse u32 num_closid = resctrl_arch_get_num_closid(r); 1939781096d9SJames Morse struct rdt_domain *d; 1940781096d9SJames Morse int i; 1941fa7d9493SBabu Moger 1942b045c215SJames Morse if (!supports_mba_mbps() || mba_sc == is_mba_sc(r)) 1943fa7d9493SBabu Moger return -EINVAL; 1944fa7d9493SBabu Moger 1945fa7d9493SBabu Moger r->membw.mba_sc = mba_sc; 1946fa7d9493SBabu Moger 1947781096d9SJames Morse list_for_each_entry(d, &r->domains, list) { 1948781096d9SJames Morse for (i = 0; i < num_closid; i++) 1949781096d9SJames Morse d->mbps_val[i] = MBA_MAX_MBPS; 1950781096d9SJames Morse } 1951781096d9SJames Morse 1952fa7d9493SBabu Moger return 0; 1953fa7d9493SBabu Moger } 1954fa7d9493SBabu Moger 19555c3b63cdSJames Morse static int cdp_enable(int level) 1956fa7d9493SBabu Moger { 195763c8b123SJames Morse struct rdt_resource *r_l = &rdt_resources_all[level].r_resctrl; 1958fa7d9493SBabu Moger int ret; 1959fa7d9493SBabu Moger 19605c3b63cdSJames Morse if (!r_l->alloc_capable) 1961fa7d9493SBabu Moger return -EINVAL; 1962fa7d9493SBabu Moger 1963fa7d9493SBabu Moger ret = set_cache_qos_cfg(level, true); 19645c3b63cdSJames Morse if (!ret) 1965c091e907SJames Morse rdt_resources_all[level].cdp_enabled = true; 19665c3b63cdSJames Morse 1967fa7d9493SBabu Moger return ret; 1968fa7d9493SBabu Moger } 1969fa7d9493SBabu Moger 19705c3b63cdSJames Morse static void cdp_disable(int level) 1971fa7d9493SBabu Moger { 1972c091e907SJames Morse struct rdt_hw_resource *r_hw = &rdt_resources_all[level]; 1973fa7d9493SBabu Moger 1974c091e907SJames Morse if (r_hw->cdp_enabled) { 1975fa7d9493SBabu Moger set_cache_qos_cfg(level, false); 1976c091e907SJames Morse r_hw->cdp_enabled = false; 1977fa7d9493SBabu Moger } 1978fa7d9493SBabu Moger } 1979fa7d9493SBabu Moger 1980c091e907SJames Morse int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable) 1981fa7d9493SBabu Moger { 1982c091e907SJames Morse struct rdt_hw_resource *hw_res = &rdt_resources_all[l]; 1983c091e907SJames Morse 1984c091e907SJames Morse if (!hw_res->r_resctrl.cdp_capable) 1985c091e907SJames Morse return -EINVAL; 1986c091e907SJames Morse 1987c091e907SJames Morse if (enable) 19885c3b63cdSJames Morse return cdp_enable(l); 1989c091e907SJames Morse 19905c3b63cdSJames Morse cdp_disable(l); 1991c091e907SJames Morse 1992c091e907SJames Morse return 0; 1993fa7d9493SBabu Moger } 1994fa7d9493SBabu Moger 1995fa7d9493SBabu Moger static void cdp_disable_all(void) 1996fa7d9493SBabu Moger { 1997c091e907SJames Morse if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3)) 1998c091e907SJames Morse resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false); 1999c091e907SJames Morse if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2)) 2000c091e907SJames Morse resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false); 2001fa7d9493SBabu Moger } 2002fa7d9493SBabu Moger 2003fa7d9493SBabu Moger /* 2004fa7d9493SBabu Moger * We don't allow rdtgroup directories to be created anywhere 2005fa7d9493SBabu Moger * except the root directory. Thus when looking for the rdtgroup 2006fa7d9493SBabu Moger * structure for a kernfs node we are either looking at a directory, 2007fa7d9493SBabu Moger * in which case the rdtgroup structure is pointed at by the "priv" 2008fa7d9493SBabu Moger * field, otherwise we have a file, and need only look to the parent 2009fa7d9493SBabu Moger * to find the rdtgroup. 2010fa7d9493SBabu Moger */ 2011fa7d9493SBabu Moger static struct rdtgroup *kernfs_to_rdtgroup(struct kernfs_node *kn) 2012fa7d9493SBabu Moger { 2013fa7d9493SBabu Moger if (kernfs_type(kn) == KERNFS_DIR) { 2014fa7d9493SBabu Moger /* 2015fa7d9493SBabu Moger * All the resource directories use "kn->priv" 2016fa7d9493SBabu Moger * to point to the "struct rdtgroup" for the 2017fa7d9493SBabu Moger * resource. "info" and its subdirectories don't 2018fa7d9493SBabu Moger * have rdtgroup structures, so return NULL here. 2019fa7d9493SBabu Moger */ 2020fa7d9493SBabu Moger if (kn == kn_info || kn->parent == kn_info) 2021fa7d9493SBabu Moger return NULL; 2022fa7d9493SBabu Moger else 2023fa7d9493SBabu Moger return kn->priv; 2024fa7d9493SBabu Moger } else { 2025fa7d9493SBabu Moger return kn->parent->priv; 2026fa7d9493SBabu Moger } 2027fa7d9493SBabu Moger } 2028fa7d9493SBabu Moger 2029fa7d9493SBabu Moger struct rdtgroup *rdtgroup_kn_lock_live(struct kernfs_node *kn) 2030fa7d9493SBabu Moger { 2031fa7d9493SBabu Moger struct rdtgroup *rdtgrp = kernfs_to_rdtgroup(kn); 2032fa7d9493SBabu Moger 2033fa7d9493SBabu Moger if (!rdtgrp) 2034fa7d9493SBabu Moger return NULL; 2035fa7d9493SBabu Moger 2036fa7d9493SBabu Moger atomic_inc(&rdtgrp->waitcount); 2037fa7d9493SBabu Moger kernfs_break_active_protection(kn); 2038fa7d9493SBabu Moger 2039fa7d9493SBabu Moger mutex_lock(&rdtgroup_mutex); 2040fa7d9493SBabu Moger 2041fa7d9493SBabu Moger /* Was this group deleted while we waited? */ 2042fa7d9493SBabu Moger if (rdtgrp->flags & RDT_DELETED) 2043fa7d9493SBabu Moger return NULL; 2044fa7d9493SBabu Moger 2045fa7d9493SBabu Moger return rdtgrp; 2046fa7d9493SBabu Moger } 2047fa7d9493SBabu Moger 2048fa7d9493SBabu Moger void rdtgroup_kn_unlock(struct kernfs_node *kn) 2049fa7d9493SBabu Moger { 2050fa7d9493SBabu Moger struct rdtgroup *rdtgrp = kernfs_to_rdtgroup(kn); 2051fa7d9493SBabu Moger 2052fa7d9493SBabu Moger if (!rdtgrp) 2053fa7d9493SBabu Moger return; 2054fa7d9493SBabu Moger 2055fa7d9493SBabu Moger mutex_unlock(&rdtgroup_mutex); 2056fa7d9493SBabu Moger 2057fa7d9493SBabu Moger if (atomic_dec_and_test(&rdtgrp->waitcount) && 2058fa7d9493SBabu Moger (rdtgrp->flags & RDT_DELETED)) { 2059fa7d9493SBabu Moger if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP || 2060fa7d9493SBabu Moger rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) 2061fa7d9493SBabu Moger rdtgroup_pseudo_lock_remove(rdtgrp); 2062fa7d9493SBabu Moger kernfs_unbreak_active_protection(kn); 206375899924SXiaochen Shen rdtgroup_remove(rdtgrp); 2064fa7d9493SBabu Moger } else { 2065fa7d9493SBabu Moger kernfs_unbreak_active_protection(kn); 2066fa7d9493SBabu Moger } 2067fa7d9493SBabu Moger } 2068fa7d9493SBabu Moger 2069fa7d9493SBabu Moger static int mkdir_mondata_all(struct kernfs_node *parent_kn, 2070fa7d9493SBabu Moger struct rdtgroup *prgrp, 2071fa7d9493SBabu Moger struct kernfs_node **mon_data_kn); 2072fa7d9493SBabu Moger 207323bf1b6bSDavid Howells static int rdt_enable_ctx(struct rdt_fs_context *ctx) 2074fa7d9493SBabu Moger { 207523bf1b6bSDavid Howells int ret = 0; 207623bf1b6bSDavid Howells 207723bf1b6bSDavid Howells if (ctx->enable_cdpl2) 2078c091e907SJames Morse ret = resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, true); 207923bf1b6bSDavid Howells 208023bf1b6bSDavid Howells if (!ret && ctx->enable_cdpl3) 2081c091e907SJames Morse ret = resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, true); 208223bf1b6bSDavid Howells 208323bf1b6bSDavid Howells if (!ret && ctx->enable_mba_mbps) 208423bf1b6bSDavid Howells ret = set_mba_sc(true); 208523bf1b6bSDavid Howells 208623bf1b6bSDavid Howells return ret; 208723bf1b6bSDavid Howells } 208823bf1b6bSDavid Howells 20895c3b63cdSJames Morse static int schemata_list_add(struct rdt_resource *r, enum resctrl_conf_type type) 2090cdb9ebc9SJames Morse { 2091cdb9ebc9SJames Morse struct resctrl_schema *s; 20925c3b63cdSJames Morse const char *suffix = ""; 2093e198fde3SJames Morse int ret, cl; 2094cdb9ebc9SJames Morse 2095cdb9ebc9SJames Morse s = kzalloc(sizeof(*s), GFP_KERNEL); 2096cdb9ebc9SJames Morse if (!s) 2097cdb9ebc9SJames Morse return -ENOMEM; 2098cdb9ebc9SJames Morse 2099cdb9ebc9SJames Morse s->res = r; 2100eb6f3187SJames Morse s->num_closid = resctrl_arch_get_num_closid(r); 2101141739aaSJames Morse if (resctrl_arch_get_cdp_enabled(r->rid)) 2102141739aaSJames Morse s->num_closid /= 2; 2103cdb9ebc9SJames Morse 21045c3b63cdSJames Morse s->conf_type = type; 21055c3b63cdSJames Morse switch (type) { 21065c3b63cdSJames Morse case CDP_CODE: 21075c3b63cdSJames Morse suffix = "CODE"; 21085c3b63cdSJames Morse break; 21095c3b63cdSJames Morse case CDP_DATA: 21105c3b63cdSJames Morse suffix = "DATA"; 21115c3b63cdSJames Morse break; 21125c3b63cdSJames Morse case CDP_NONE: 21135c3b63cdSJames Morse suffix = ""; 21145c3b63cdSJames Morse break; 21155c3b63cdSJames Morse } 21165c3b63cdSJames Morse 21175c3b63cdSJames Morse ret = snprintf(s->name, sizeof(s->name), "%s%s", r->name, suffix); 2118e198fde3SJames Morse if (ret >= sizeof(s->name)) { 2119e198fde3SJames Morse kfree(s); 2120e198fde3SJames Morse return -EINVAL; 2121e198fde3SJames Morse } 2122e198fde3SJames Morse 2123e198fde3SJames Morse cl = strlen(s->name); 2124e198fde3SJames Morse 2125e198fde3SJames Morse /* 2126e198fde3SJames Morse * If CDP is supported by this resource, but not enabled, 2127e198fde3SJames Morse * include the suffix. This ensures the tabular format of the 21285c3b63cdSJames Morse * schemata file does not change between mounts of the filesystem. 2129e198fde3SJames Morse */ 2130e198fde3SJames Morse if (r->cdp_capable && !resctrl_arch_get_cdp_enabled(r->rid)) 2131e198fde3SJames Morse cl += 4; 2132e198fde3SJames Morse 2133e198fde3SJames Morse if (cl > max_name_width) 2134e198fde3SJames Morse max_name_width = cl; 2135e198fde3SJames Morse 2136cdb9ebc9SJames Morse INIT_LIST_HEAD(&s->list); 2137cdb9ebc9SJames Morse list_add(&s->list, &resctrl_schema_all); 2138cdb9ebc9SJames Morse 2139cdb9ebc9SJames Morse return 0; 2140cdb9ebc9SJames Morse } 2141cdb9ebc9SJames Morse 21425c3b63cdSJames Morse static int schemata_list_create(void) 21435c3b63cdSJames Morse { 21445c3b63cdSJames Morse struct rdt_resource *r; 21455c3b63cdSJames Morse int ret = 0; 21465c3b63cdSJames Morse 21474d269ed4SJames Morse for_each_alloc_capable_rdt_resource(r) { 21485c3b63cdSJames Morse if (resctrl_arch_get_cdp_enabled(r->rid)) { 21495c3b63cdSJames Morse ret = schemata_list_add(r, CDP_CODE); 21505c3b63cdSJames Morse if (ret) 21515c3b63cdSJames Morse break; 21525c3b63cdSJames Morse 21535c3b63cdSJames Morse ret = schemata_list_add(r, CDP_DATA); 21545c3b63cdSJames Morse } else { 21555c3b63cdSJames Morse ret = schemata_list_add(r, CDP_NONE); 21565c3b63cdSJames Morse } 21575c3b63cdSJames Morse 21585c3b63cdSJames Morse if (ret) 21595c3b63cdSJames Morse break; 21605c3b63cdSJames Morse } 21615c3b63cdSJames Morse 21625c3b63cdSJames Morse return ret; 21635c3b63cdSJames Morse } 21645c3b63cdSJames Morse 2165cdb9ebc9SJames Morse static void schemata_list_destroy(void) 2166cdb9ebc9SJames Morse { 2167cdb9ebc9SJames Morse struct resctrl_schema *s, *tmp; 2168cdb9ebc9SJames Morse 2169cdb9ebc9SJames Morse list_for_each_entry_safe(s, tmp, &resctrl_schema_all, list) { 2170cdb9ebc9SJames Morse list_del(&s->list); 2171cdb9ebc9SJames Morse kfree(s); 2172cdb9ebc9SJames Morse } 2173cdb9ebc9SJames Morse } 2174cdb9ebc9SJames Morse 217523bf1b6bSDavid Howells static int rdt_get_tree(struct fs_context *fc) 217623bf1b6bSDavid Howells { 217723bf1b6bSDavid Howells struct rdt_fs_context *ctx = rdt_fc2context(fc); 2178fa7d9493SBabu Moger struct rdt_domain *dom; 2179fa7d9493SBabu Moger struct rdt_resource *r; 2180fa7d9493SBabu Moger int ret; 2181fa7d9493SBabu Moger 2182fa7d9493SBabu Moger cpus_read_lock(); 2183fa7d9493SBabu Moger mutex_lock(&rdtgroup_mutex); 2184fa7d9493SBabu Moger /* 2185fa7d9493SBabu Moger * resctrl file system can only be mounted once. 2186fa7d9493SBabu Moger */ 2187fa7d9493SBabu Moger if (static_branch_unlikely(&rdt_enable_key)) { 218823bf1b6bSDavid Howells ret = -EBUSY; 2189fa7d9493SBabu Moger goto out; 2190fa7d9493SBabu Moger } 2191fa7d9493SBabu Moger 219223bf1b6bSDavid Howells ret = rdt_enable_ctx(ctx); 219323bf1b6bSDavid Howells if (ret < 0) 2194fa7d9493SBabu Moger goto out_cdp; 2195fa7d9493SBabu Moger 2196cdb9ebc9SJames Morse ret = schemata_list_create(); 2197cdb9ebc9SJames Morse if (ret) { 2198cdb9ebc9SJames Morse schemata_list_destroy(); 2199cdb9ebc9SJames Morse goto out_mba; 2200cdb9ebc9SJames Morse } 2201cdb9ebc9SJames Morse 2202fa7d9493SBabu Moger closid_init(); 2203fa7d9493SBabu Moger 2204fa7d9493SBabu Moger ret = rdtgroup_create_info_dir(rdtgroup_default.kn); 220523bf1b6bSDavid Howells if (ret < 0) 2206cdb9ebc9SJames Morse goto out_schemata_free; 2207fa7d9493SBabu Moger 2208fa7d9493SBabu Moger if (rdt_mon_capable) { 2209fa7d9493SBabu Moger ret = mongroup_create_dir(rdtgroup_default.kn, 2210334b0f4eSXiaochen Shen &rdtgroup_default, "mon_groups", 2211fa7d9493SBabu Moger &kn_mongrp); 221223bf1b6bSDavid Howells if (ret < 0) 2213fa7d9493SBabu Moger goto out_info; 2214fa7d9493SBabu Moger 2215fa7d9493SBabu Moger ret = mkdir_mondata_all(rdtgroup_default.kn, 2216fa7d9493SBabu Moger &rdtgroup_default, &kn_mondata); 221723bf1b6bSDavid Howells if (ret < 0) 2218fa7d9493SBabu Moger goto out_mongrp; 2219fa7d9493SBabu Moger rdtgroup_default.mon.mon_data_kn = kn_mondata; 2220fa7d9493SBabu Moger } 2221fa7d9493SBabu Moger 2222fa7d9493SBabu Moger ret = rdt_pseudo_lock_init(); 222323bf1b6bSDavid Howells if (ret) 2224fa7d9493SBabu Moger goto out_mondata; 2225fa7d9493SBabu Moger 222623bf1b6bSDavid Howells ret = kernfs_get_tree(fc); 222723bf1b6bSDavid Howells if (ret < 0) 2228fa7d9493SBabu Moger goto out_psl; 2229fa7d9493SBabu Moger 2230fa7d9493SBabu Moger if (rdt_alloc_capable) 2231fa7d9493SBabu Moger static_branch_enable_cpuslocked(&rdt_alloc_enable_key); 2232fa7d9493SBabu Moger if (rdt_mon_capable) 2233fa7d9493SBabu Moger static_branch_enable_cpuslocked(&rdt_mon_enable_key); 2234fa7d9493SBabu Moger 2235fa7d9493SBabu Moger if (rdt_alloc_capable || rdt_mon_capable) 2236fa7d9493SBabu Moger static_branch_enable_cpuslocked(&rdt_enable_key); 2237fa7d9493SBabu Moger 2238fa7d9493SBabu Moger if (is_mbm_enabled()) { 223963c8b123SJames Morse r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl; 2240fa7d9493SBabu Moger list_for_each_entry(dom, &r->domains, list) 2241fa7d9493SBabu Moger mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL); 2242fa7d9493SBabu Moger } 2243fa7d9493SBabu Moger 2244fa7d9493SBabu Moger goto out; 2245fa7d9493SBabu Moger 2246fa7d9493SBabu Moger out_psl: 2247fa7d9493SBabu Moger rdt_pseudo_lock_release(); 2248fa7d9493SBabu Moger out_mondata: 2249fa7d9493SBabu Moger if (rdt_mon_capable) 2250fa7d9493SBabu Moger kernfs_remove(kn_mondata); 2251fa7d9493SBabu Moger out_mongrp: 2252fa7d9493SBabu Moger if (rdt_mon_capable) 2253fa7d9493SBabu Moger kernfs_remove(kn_mongrp); 2254fa7d9493SBabu Moger out_info: 2255fa7d9493SBabu Moger kernfs_remove(kn_info); 2256cdb9ebc9SJames Morse out_schemata_free: 2257cdb9ebc9SJames Morse schemata_list_destroy(); 225823bf1b6bSDavid Howells out_mba: 225923bf1b6bSDavid Howells if (ctx->enable_mba_mbps) 226023bf1b6bSDavid Howells set_mba_sc(false); 2261fa7d9493SBabu Moger out_cdp: 2262fa7d9493SBabu Moger cdp_disable_all(); 2263fa7d9493SBabu Moger out: 2264fa7d9493SBabu Moger rdt_last_cmd_clear(); 2265fa7d9493SBabu Moger mutex_unlock(&rdtgroup_mutex); 2266fa7d9493SBabu Moger cpus_read_unlock(); 226723bf1b6bSDavid Howells return ret; 226823bf1b6bSDavid Howells } 2269fa7d9493SBabu Moger 227023bf1b6bSDavid Howells enum rdt_param { 227123bf1b6bSDavid Howells Opt_cdp, 227223bf1b6bSDavid Howells Opt_cdpl2, 2273faa3604eSXiaochen Shen Opt_mba_mbps, 227423bf1b6bSDavid Howells nr__rdt_params 227523bf1b6bSDavid Howells }; 227623bf1b6bSDavid Howells 2277d7167b14SAl Viro static const struct fs_parameter_spec rdt_fs_parameters[] = { 227823bf1b6bSDavid Howells fsparam_flag("cdp", Opt_cdp), 227923bf1b6bSDavid Howells fsparam_flag("cdpl2", Opt_cdpl2), 2280faa3604eSXiaochen Shen fsparam_flag("mba_MBps", Opt_mba_mbps), 228123bf1b6bSDavid Howells {} 228223bf1b6bSDavid Howells }; 228323bf1b6bSDavid Howells 228423bf1b6bSDavid Howells static int rdt_parse_param(struct fs_context *fc, struct fs_parameter *param) 228523bf1b6bSDavid Howells { 228623bf1b6bSDavid Howells struct rdt_fs_context *ctx = rdt_fc2context(fc); 228723bf1b6bSDavid Howells struct fs_parse_result result; 228823bf1b6bSDavid Howells int opt; 228923bf1b6bSDavid Howells 2290d7167b14SAl Viro opt = fs_parse(fc, rdt_fs_parameters, param, &result); 229123bf1b6bSDavid Howells if (opt < 0) 229223bf1b6bSDavid Howells return opt; 229323bf1b6bSDavid Howells 229423bf1b6bSDavid Howells switch (opt) { 229523bf1b6bSDavid Howells case Opt_cdp: 229623bf1b6bSDavid Howells ctx->enable_cdpl3 = true; 229723bf1b6bSDavid Howells return 0; 229823bf1b6bSDavid Howells case Opt_cdpl2: 229923bf1b6bSDavid Howells ctx->enable_cdpl2 = true; 230023bf1b6bSDavid Howells return 0; 2301faa3604eSXiaochen Shen case Opt_mba_mbps: 2302b045c215SJames Morse if (!supports_mba_mbps()) 230323bf1b6bSDavid Howells return -EINVAL; 230423bf1b6bSDavid Howells ctx->enable_mba_mbps = true; 230523bf1b6bSDavid Howells return 0; 230623bf1b6bSDavid Howells } 230723bf1b6bSDavid Howells 230823bf1b6bSDavid Howells return -EINVAL; 230923bf1b6bSDavid Howells } 231023bf1b6bSDavid Howells 231123bf1b6bSDavid Howells static void rdt_fs_context_free(struct fs_context *fc) 231223bf1b6bSDavid Howells { 231323bf1b6bSDavid Howells struct rdt_fs_context *ctx = rdt_fc2context(fc); 231423bf1b6bSDavid Howells 231523bf1b6bSDavid Howells kernfs_free_fs_context(fc); 231623bf1b6bSDavid Howells kfree(ctx); 231723bf1b6bSDavid Howells } 231823bf1b6bSDavid Howells 231923bf1b6bSDavid Howells static const struct fs_context_operations rdt_fs_context_ops = { 232023bf1b6bSDavid Howells .free = rdt_fs_context_free, 232123bf1b6bSDavid Howells .parse_param = rdt_parse_param, 232223bf1b6bSDavid Howells .get_tree = rdt_get_tree, 232323bf1b6bSDavid Howells }; 232423bf1b6bSDavid Howells 232523bf1b6bSDavid Howells static int rdt_init_fs_context(struct fs_context *fc) 232623bf1b6bSDavid Howells { 232723bf1b6bSDavid Howells struct rdt_fs_context *ctx; 232823bf1b6bSDavid Howells 232923bf1b6bSDavid Howells ctx = kzalloc(sizeof(struct rdt_fs_context), GFP_KERNEL); 233023bf1b6bSDavid Howells if (!ctx) 233123bf1b6bSDavid Howells return -ENOMEM; 233223bf1b6bSDavid Howells 233323bf1b6bSDavid Howells ctx->kfc.root = rdt_root; 233423bf1b6bSDavid Howells ctx->kfc.magic = RDTGROUP_SUPER_MAGIC; 233523bf1b6bSDavid Howells fc->fs_private = &ctx->kfc; 233623bf1b6bSDavid Howells fc->ops = &rdt_fs_context_ops; 233723bf1b6bSDavid Howells put_user_ns(fc->user_ns); 233823bf1b6bSDavid Howells fc->user_ns = get_user_ns(&init_user_ns); 233923bf1b6bSDavid Howells fc->global = true; 234023bf1b6bSDavid Howells return 0; 2341fa7d9493SBabu Moger } 2342fa7d9493SBabu Moger 2343fa7d9493SBabu Moger static int reset_all_ctrls(struct rdt_resource *r) 2344fa7d9493SBabu Moger { 234563c8b123SJames Morse struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r); 2346792e0f6fSJames Morse struct rdt_hw_domain *hw_dom; 2347fa7d9493SBabu Moger struct msr_param msr_param; 2348fa7d9493SBabu Moger cpumask_var_t cpu_mask; 2349fa7d9493SBabu Moger struct rdt_domain *d; 2350fa7d9493SBabu Moger int i, cpu; 2351fa7d9493SBabu Moger 2352fa7d9493SBabu Moger if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL)) 2353fa7d9493SBabu Moger return -ENOMEM; 2354fa7d9493SBabu Moger 2355fa7d9493SBabu Moger msr_param.res = r; 2356fa7d9493SBabu Moger msr_param.low = 0; 235763c8b123SJames Morse msr_param.high = hw_res->num_closid; 2358fa7d9493SBabu Moger 2359fa7d9493SBabu Moger /* 2360fa7d9493SBabu Moger * Disable resource control for this resource by setting all 2361fa7d9493SBabu Moger * CBMs in all domains to the maximum mask value. Pick one CPU 2362fa7d9493SBabu Moger * from each domain to update the MSRs below. 2363fa7d9493SBabu Moger */ 2364fa7d9493SBabu Moger list_for_each_entry(d, &r->domains, list) { 2365792e0f6fSJames Morse hw_dom = resctrl_to_arch_dom(d); 2366fa7d9493SBabu Moger cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask); 2367fa7d9493SBabu Moger 2368b58d4eb1SJames Morse for (i = 0; i < hw_res->num_closid; i++) 2369792e0f6fSJames Morse hw_dom->ctrl_val[i] = r->default_ctrl; 2370fa7d9493SBabu Moger } 2371fa7d9493SBabu Moger cpu = get_cpu(); 2372fa7d9493SBabu Moger /* Update CBM on this cpu if it's in cpu_mask. */ 2373fa7d9493SBabu Moger if (cpumask_test_cpu(cpu, cpu_mask)) 2374fa7d9493SBabu Moger rdt_ctrl_update(&msr_param); 2375fa7d9493SBabu Moger /* Update CBM on all other cpus in cpu_mask. */ 2376fa7d9493SBabu Moger smp_call_function_many(cpu_mask, rdt_ctrl_update, &msr_param, 1); 2377fa7d9493SBabu Moger put_cpu(); 2378fa7d9493SBabu Moger 2379fa7d9493SBabu Moger free_cpumask_var(cpu_mask); 2380fa7d9493SBabu Moger 2381fa7d9493SBabu Moger return 0; 2382fa7d9493SBabu Moger } 2383fa7d9493SBabu Moger 2384fa7d9493SBabu Moger /* 2385fa7d9493SBabu Moger * Move tasks from one to the other group. If @from is NULL, then all tasks 2386fa7d9493SBabu Moger * in the systems are moved unconditionally (used for teardown). 2387fa7d9493SBabu Moger * 2388fa7d9493SBabu Moger * If @mask is not NULL the cpus on which moved tasks are running are set 2389fa7d9493SBabu Moger * in that mask so the update smp function call is restricted to affected 2390fa7d9493SBabu Moger * cpus. 2391fa7d9493SBabu Moger */ 2392fa7d9493SBabu Moger static void rdt_move_group_tasks(struct rdtgroup *from, struct rdtgroup *to, 2393fa7d9493SBabu Moger struct cpumask *mask) 2394fa7d9493SBabu Moger { 2395fa7d9493SBabu Moger struct task_struct *p, *t; 2396fa7d9493SBabu Moger 2397fa7d9493SBabu Moger read_lock(&tasklist_lock); 2398fa7d9493SBabu Moger for_each_process_thread(p, t) { 2399fa7d9493SBabu Moger if (!from || is_closid_match(t, from) || 2400fa7d9493SBabu Moger is_rmid_match(t, from)) { 24016d3b47ddSValentin Schneider WRITE_ONCE(t->closid, to->closid); 24026d3b47ddSValentin Schneider WRITE_ONCE(t->rmid, to->mon.rmid); 2403fa7d9493SBabu Moger 2404fa7d9493SBabu Moger /* 2405e0ad6dc8SReinette Chatre * If the task is on a CPU, set the CPU in the mask. 2406e0ad6dc8SReinette Chatre * The detection is inaccurate as tasks might move or 2407e0ad6dc8SReinette Chatre * schedule before the smp function call takes place. 2408e0ad6dc8SReinette Chatre * In such a case the function call is pointless, but 2409fa7d9493SBabu Moger * there is no other side effect. 2410fa7d9493SBabu Moger */ 2411e0ad6dc8SReinette Chatre if (IS_ENABLED(CONFIG_SMP) && mask && task_curr(t)) 2412fa7d9493SBabu Moger cpumask_set_cpu(task_cpu(t), mask); 2413fa7d9493SBabu Moger } 2414fa7d9493SBabu Moger } 2415fa7d9493SBabu Moger read_unlock(&tasklist_lock); 2416fa7d9493SBabu Moger } 2417fa7d9493SBabu Moger 2418fa7d9493SBabu Moger static void free_all_child_rdtgrp(struct rdtgroup *rdtgrp) 2419fa7d9493SBabu Moger { 2420fa7d9493SBabu Moger struct rdtgroup *sentry, *stmp; 2421fa7d9493SBabu Moger struct list_head *head; 2422fa7d9493SBabu Moger 2423fa7d9493SBabu Moger head = &rdtgrp->mon.crdtgrp_list; 2424fa7d9493SBabu Moger list_for_each_entry_safe(sentry, stmp, head, mon.crdtgrp_list) { 2425fa7d9493SBabu Moger free_rmid(sentry->mon.rmid); 2426fa7d9493SBabu Moger list_del(&sentry->mon.crdtgrp_list); 2427b8511cccSXiaochen Shen 2428b8511cccSXiaochen Shen if (atomic_read(&sentry->waitcount) != 0) 2429b8511cccSXiaochen Shen sentry->flags = RDT_DELETED; 2430b8511cccSXiaochen Shen else 243175899924SXiaochen Shen rdtgroup_remove(sentry); 2432fa7d9493SBabu Moger } 2433fa7d9493SBabu Moger } 2434fa7d9493SBabu Moger 2435fa7d9493SBabu Moger /* 2436fa7d9493SBabu Moger * Forcibly remove all of subdirectories under root. 2437fa7d9493SBabu Moger */ 2438fa7d9493SBabu Moger static void rmdir_all_sub(void) 2439fa7d9493SBabu Moger { 2440fa7d9493SBabu Moger struct rdtgroup *rdtgrp, *tmp; 2441fa7d9493SBabu Moger 2442fa7d9493SBabu Moger /* Move all tasks to the default resource group */ 2443fa7d9493SBabu Moger rdt_move_group_tasks(NULL, &rdtgroup_default, NULL); 2444fa7d9493SBabu Moger 2445fa7d9493SBabu Moger list_for_each_entry_safe(rdtgrp, tmp, &rdt_all_groups, rdtgroup_list) { 2446fa7d9493SBabu Moger /* Free any child rmids */ 2447fa7d9493SBabu Moger free_all_child_rdtgrp(rdtgrp); 2448fa7d9493SBabu Moger 2449fa7d9493SBabu Moger /* Remove each rdtgroup other than root */ 2450fa7d9493SBabu Moger if (rdtgrp == &rdtgroup_default) 2451fa7d9493SBabu Moger continue; 2452fa7d9493SBabu Moger 2453fa7d9493SBabu Moger if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP || 2454fa7d9493SBabu Moger rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) 2455fa7d9493SBabu Moger rdtgroup_pseudo_lock_remove(rdtgrp); 2456fa7d9493SBabu Moger 2457fa7d9493SBabu Moger /* 2458fa7d9493SBabu Moger * Give any CPUs back to the default group. We cannot copy 2459fa7d9493SBabu Moger * cpu_online_mask because a CPU might have executed the 2460fa7d9493SBabu Moger * offline callback already, but is still marked online. 2461fa7d9493SBabu Moger */ 2462fa7d9493SBabu Moger cpumask_or(&rdtgroup_default.cpu_mask, 2463fa7d9493SBabu Moger &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask); 2464fa7d9493SBabu Moger 2465fa7d9493SBabu Moger free_rmid(rdtgrp->mon.rmid); 2466fa7d9493SBabu Moger 2467fa7d9493SBabu Moger kernfs_remove(rdtgrp->kn); 2468fa7d9493SBabu Moger list_del(&rdtgrp->rdtgroup_list); 2469b8511cccSXiaochen Shen 2470b8511cccSXiaochen Shen if (atomic_read(&rdtgrp->waitcount) != 0) 2471b8511cccSXiaochen Shen rdtgrp->flags = RDT_DELETED; 2472b8511cccSXiaochen Shen else 247375899924SXiaochen Shen rdtgroup_remove(rdtgrp); 2474fa7d9493SBabu Moger } 2475fa7d9493SBabu Moger /* Notify online CPUs to update per cpu storage and PQR_ASSOC MSR */ 2476fa7d9493SBabu Moger update_closid_rmid(cpu_online_mask, &rdtgroup_default); 2477fa7d9493SBabu Moger 2478fa7d9493SBabu Moger kernfs_remove(kn_info); 2479fa7d9493SBabu Moger kernfs_remove(kn_mongrp); 2480fa7d9493SBabu Moger kernfs_remove(kn_mondata); 2481fa7d9493SBabu Moger } 2482fa7d9493SBabu Moger 2483fa7d9493SBabu Moger static void rdt_kill_sb(struct super_block *sb) 2484fa7d9493SBabu Moger { 2485fa7d9493SBabu Moger struct rdt_resource *r; 2486fa7d9493SBabu Moger 2487fa7d9493SBabu Moger cpus_read_lock(); 2488fa7d9493SBabu Moger mutex_lock(&rdtgroup_mutex); 2489fa7d9493SBabu Moger 2490fa7d9493SBabu Moger set_mba_sc(false); 2491fa7d9493SBabu Moger 2492fa7d9493SBabu Moger /*Put everything back to default values. */ 24934d269ed4SJames Morse for_each_alloc_capable_rdt_resource(r) 2494fa7d9493SBabu Moger reset_all_ctrls(r); 2495fa7d9493SBabu Moger cdp_disable_all(); 2496fa7d9493SBabu Moger rmdir_all_sub(); 2497fa7d9493SBabu Moger rdt_pseudo_lock_release(); 2498fa7d9493SBabu Moger rdtgroup_default.mode = RDT_MODE_SHAREABLE; 2499cdb9ebc9SJames Morse schemata_list_destroy(); 2500fa7d9493SBabu Moger static_branch_disable_cpuslocked(&rdt_alloc_enable_key); 2501fa7d9493SBabu Moger static_branch_disable_cpuslocked(&rdt_mon_enable_key); 2502fa7d9493SBabu Moger static_branch_disable_cpuslocked(&rdt_enable_key); 2503fa7d9493SBabu Moger kernfs_kill_sb(sb); 2504fa7d9493SBabu Moger mutex_unlock(&rdtgroup_mutex); 2505fa7d9493SBabu Moger cpus_read_unlock(); 2506fa7d9493SBabu Moger } 2507fa7d9493SBabu Moger 2508fa7d9493SBabu Moger static struct file_system_type rdt_fs_type = { 2509fa7d9493SBabu Moger .name = "resctrl", 251023bf1b6bSDavid Howells .init_fs_context = rdt_init_fs_context, 2511d7167b14SAl Viro .parameters = rdt_fs_parameters, 2512fa7d9493SBabu Moger .kill_sb = rdt_kill_sb, 2513fa7d9493SBabu Moger }; 2514fa7d9493SBabu Moger 2515fa7d9493SBabu Moger static int mon_addfile(struct kernfs_node *parent_kn, const char *name, 2516fa7d9493SBabu Moger void *priv) 2517fa7d9493SBabu Moger { 2518fa7d9493SBabu Moger struct kernfs_node *kn; 2519fa7d9493SBabu Moger int ret = 0; 2520fa7d9493SBabu Moger 2521fa7d9493SBabu Moger kn = __kernfs_create_file(parent_kn, name, 0444, 2522fa7d9493SBabu Moger GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, 0, 2523fa7d9493SBabu Moger &kf_mondata_ops, priv, NULL, NULL); 2524fa7d9493SBabu Moger if (IS_ERR(kn)) 2525fa7d9493SBabu Moger return PTR_ERR(kn); 2526fa7d9493SBabu Moger 2527fa7d9493SBabu Moger ret = rdtgroup_kn_set_ugid(kn); 2528fa7d9493SBabu Moger if (ret) { 2529fa7d9493SBabu Moger kernfs_remove(kn); 2530fa7d9493SBabu Moger return ret; 2531fa7d9493SBabu Moger } 2532fa7d9493SBabu Moger 2533fa7d9493SBabu Moger return ret; 2534fa7d9493SBabu Moger } 2535fa7d9493SBabu Moger 2536fa7d9493SBabu Moger /* 2537fa7d9493SBabu Moger * Remove all subdirectories of mon_data of ctrl_mon groups 2538fa7d9493SBabu Moger * and monitor groups with given domain id. 2539fa7d9493SBabu Moger */ 2540798fd4b9SJames Morse static void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r, 2541798fd4b9SJames Morse unsigned int dom_id) 2542fa7d9493SBabu Moger { 2543fa7d9493SBabu Moger struct rdtgroup *prgrp, *crgrp; 2544fa7d9493SBabu Moger char name[32]; 2545fa7d9493SBabu Moger 2546fa7d9493SBabu Moger list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) { 2547fa7d9493SBabu Moger sprintf(name, "mon_%s_%02d", r->name, dom_id); 2548fa7d9493SBabu Moger kernfs_remove_by_name(prgrp->mon.mon_data_kn, name); 2549fa7d9493SBabu Moger 2550fa7d9493SBabu Moger list_for_each_entry(crgrp, &prgrp->mon.crdtgrp_list, mon.crdtgrp_list) 2551fa7d9493SBabu Moger kernfs_remove_by_name(crgrp->mon.mon_data_kn, name); 2552fa7d9493SBabu Moger } 2553fa7d9493SBabu Moger } 2554fa7d9493SBabu Moger 2555fa7d9493SBabu Moger static int mkdir_mondata_subdir(struct kernfs_node *parent_kn, 2556fa7d9493SBabu Moger struct rdt_domain *d, 2557fa7d9493SBabu Moger struct rdt_resource *r, struct rdtgroup *prgrp) 2558fa7d9493SBabu Moger { 2559fa7d9493SBabu Moger union mon_data_bits priv; 2560fa7d9493SBabu Moger struct kernfs_node *kn; 2561fa7d9493SBabu Moger struct mon_evt *mevt; 2562fa7d9493SBabu Moger struct rmid_read rr; 2563fa7d9493SBabu Moger char name[32]; 2564fa7d9493SBabu Moger int ret; 2565fa7d9493SBabu Moger 2566fa7d9493SBabu Moger sprintf(name, "mon_%s_%02d", r->name, d->id); 2567fa7d9493SBabu Moger /* create the directory */ 2568fa7d9493SBabu Moger kn = kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp); 2569fa7d9493SBabu Moger if (IS_ERR(kn)) 2570fa7d9493SBabu Moger return PTR_ERR(kn); 2571fa7d9493SBabu Moger 2572fa7d9493SBabu Moger ret = rdtgroup_kn_set_ugid(kn); 2573fa7d9493SBabu Moger if (ret) 2574fa7d9493SBabu Moger goto out_destroy; 2575fa7d9493SBabu Moger 2576fa7d9493SBabu Moger if (WARN_ON(list_empty(&r->evt_list))) { 2577fa7d9493SBabu Moger ret = -EPERM; 2578fa7d9493SBabu Moger goto out_destroy; 2579fa7d9493SBabu Moger } 2580fa7d9493SBabu Moger 2581fa7d9493SBabu Moger priv.u.rid = r->rid; 2582fa7d9493SBabu Moger priv.u.domid = d->id; 2583fa7d9493SBabu Moger list_for_each_entry(mevt, &r->evt_list, list) { 2584fa7d9493SBabu Moger priv.u.evtid = mevt->evtid; 2585fa7d9493SBabu Moger ret = mon_addfile(kn, mevt->name, priv.priv); 2586fa7d9493SBabu Moger if (ret) 2587fa7d9493SBabu Moger goto out_destroy; 2588fa7d9493SBabu Moger 2589fa7d9493SBabu Moger if (is_mbm_event(mevt->evtid)) 259046637d45SReinette Chatre mon_event_read(&rr, r, d, prgrp, mevt->evtid, true); 2591fa7d9493SBabu Moger } 2592fa7d9493SBabu Moger kernfs_activate(kn); 2593fa7d9493SBabu Moger return 0; 2594fa7d9493SBabu Moger 2595fa7d9493SBabu Moger out_destroy: 2596fa7d9493SBabu Moger kernfs_remove(kn); 2597fa7d9493SBabu Moger return ret; 2598fa7d9493SBabu Moger } 2599fa7d9493SBabu Moger 2600fa7d9493SBabu Moger /* 2601fa7d9493SBabu Moger * Add all subdirectories of mon_data for "ctrl_mon" groups 2602fa7d9493SBabu Moger * and "monitor" groups with given domain id. 2603fa7d9493SBabu Moger */ 26043a7232cdSJames Morse static void mkdir_mondata_subdir_allrdtgrp(struct rdt_resource *r, 2605fa7d9493SBabu Moger struct rdt_domain *d) 2606fa7d9493SBabu Moger { 2607fa7d9493SBabu Moger struct kernfs_node *parent_kn; 2608fa7d9493SBabu Moger struct rdtgroup *prgrp, *crgrp; 2609fa7d9493SBabu Moger struct list_head *head; 2610fa7d9493SBabu Moger 2611fa7d9493SBabu Moger list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) { 2612fa7d9493SBabu Moger parent_kn = prgrp->mon.mon_data_kn; 2613fa7d9493SBabu Moger mkdir_mondata_subdir(parent_kn, d, r, prgrp); 2614fa7d9493SBabu Moger 2615fa7d9493SBabu Moger head = &prgrp->mon.crdtgrp_list; 2616fa7d9493SBabu Moger list_for_each_entry(crgrp, head, mon.crdtgrp_list) { 2617fa7d9493SBabu Moger parent_kn = crgrp->mon.mon_data_kn; 2618fa7d9493SBabu Moger mkdir_mondata_subdir(parent_kn, d, r, crgrp); 2619fa7d9493SBabu Moger } 2620fa7d9493SBabu Moger } 2621fa7d9493SBabu Moger } 2622fa7d9493SBabu Moger 2623fa7d9493SBabu Moger static int mkdir_mondata_subdir_alldom(struct kernfs_node *parent_kn, 2624fa7d9493SBabu Moger struct rdt_resource *r, 2625fa7d9493SBabu Moger struct rdtgroup *prgrp) 2626fa7d9493SBabu Moger { 2627fa7d9493SBabu Moger struct rdt_domain *dom; 2628fa7d9493SBabu Moger int ret; 2629fa7d9493SBabu Moger 2630fa7d9493SBabu Moger list_for_each_entry(dom, &r->domains, list) { 2631fa7d9493SBabu Moger ret = mkdir_mondata_subdir(parent_kn, dom, r, prgrp); 2632fa7d9493SBabu Moger if (ret) 2633fa7d9493SBabu Moger return ret; 2634fa7d9493SBabu Moger } 2635fa7d9493SBabu Moger 2636fa7d9493SBabu Moger return 0; 2637fa7d9493SBabu Moger } 2638fa7d9493SBabu Moger 2639fa7d9493SBabu Moger /* 2640fa7d9493SBabu Moger * This creates a directory mon_data which contains the monitored data. 2641fa7d9493SBabu Moger * 2642163b0991SIngo Molnar * mon_data has one directory for each domain which are named 2643fa7d9493SBabu Moger * in the format mon_<domain_name>_<domain_id>. For ex: A mon_data 2644fa7d9493SBabu Moger * with L3 domain looks as below: 2645fa7d9493SBabu Moger * ./mon_data: 2646fa7d9493SBabu Moger * mon_L3_00 2647fa7d9493SBabu Moger * mon_L3_01 2648fa7d9493SBabu Moger * mon_L3_02 2649fa7d9493SBabu Moger * ... 2650fa7d9493SBabu Moger * 2651fa7d9493SBabu Moger * Each domain directory has one file per event: 2652fa7d9493SBabu Moger * ./mon_L3_00/: 2653fa7d9493SBabu Moger * llc_occupancy 2654fa7d9493SBabu Moger * 2655fa7d9493SBabu Moger */ 2656fa7d9493SBabu Moger static int mkdir_mondata_all(struct kernfs_node *parent_kn, 2657fa7d9493SBabu Moger struct rdtgroup *prgrp, 2658fa7d9493SBabu Moger struct kernfs_node **dest_kn) 2659fa7d9493SBabu Moger { 2660fa7d9493SBabu Moger struct rdt_resource *r; 2661fa7d9493SBabu Moger struct kernfs_node *kn; 2662fa7d9493SBabu Moger int ret; 2663fa7d9493SBabu Moger 2664fa7d9493SBabu Moger /* 2665fa7d9493SBabu Moger * Create the mon_data directory first. 2666fa7d9493SBabu Moger */ 2667334b0f4eSXiaochen Shen ret = mongroup_create_dir(parent_kn, prgrp, "mon_data", &kn); 2668fa7d9493SBabu Moger if (ret) 2669fa7d9493SBabu Moger return ret; 2670fa7d9493SBabu Moger 2671fa7d9493SBabu Moger if (dest_kn) 2672fa7d9493SBabu Moger *dest_kn = kn; 2673fa7d9493SBabu Moger 2674fa7d9493SBabu Moger /* 2675fa7d9493SBabu Moger * Create the subdirectories for each domain. Note that all events 2676fa7d9493SBabu Moger * in a domain like L3 are grouped into a resource whose domain is L3 2677fa7d9493SBabu Moger */ 2678bab6ee73SJames Morse for_each_mon_capable_rdt_resource(r) { 2679fa7d9493SBabu Moger ret = mkdir_mondata_subdir_alldom(kn, r, prgrp); 2680fa7d9493SBabu Moger if (ret) 2681fa7d9493SBabu Moger goto out_destroy; 2682fa7d9493SBabu Moger } 2683fa7d9493SBabu Moger 2684fa7d9493SBabu Moger return 0; 2685fa7d9493SBabu Moger 2686fa7d9493SBabu Moger out_destroy: 2687fa7d9493SBabu Moger kernfs_remove(kn); 2688fa7d9493SBabu Moger return ret; 2689fa7d9493SBabu Moger } 2690fa7d9493SBabu Moger 2691fa7d9493SBabu Moger /** 2692fa7d9493SBabu Moger * cbm_ensure_valid - Enforce validity on provided CBM 2693fa7d9493SBabu Moger * @_val: Candidate CBM 2694fa7d9493SBabu Moger * @r: RDT resource to which the CBM belongs 2695fa7d9493SBabu Moger * 2696fa7d9493SBabu Moger * The provided CBM represents all cache portions available for use. This 2697fa7d9493SBabu Moger * may be represented by a bitmap that does not consist of contiguous ones 2698fa7d9493SBabu Moger * and thus be an invalid CBM. 2699fa7d9493SBabu Moger * Here the provided CBM is forced to be a valid CBM by only considering 2700fa7d9493SBabu Moger * the first set of contiguous bits as valid and clearing all bits. 2701fa7d9493SBabu Moger * The intention here is to provide a valid default CBM with which a new 2702fa7d9493SBabu Moger * resource group is initialized. The user can follow this with a 2703fa7d9493SBabu Moger * modification to the CBM if the default does not satisfy the 2704fa7d9493SBabu Moger * requirements. 2705fa7d9493SBabu Moger */ 27062ef085bdSReinette Chatre static u32 cbm_ensure_valid(u32 _val, struct rdt_resource *r) 2707fa7d9493SBabu Moger { 2708fa7d9493SBabu Moger unsigned int cbm_len = r->cache.cbm_len; 2709fa7d9493SBabu Moger unsigned long first_bit, zero_bit; 27102ef085bdSReinette Chatre unsigned long val = _val; 2711fa7d9493SBabu Moger 27122ef085bdSReinette Chatre if (!val) 27132ef085bdSReinette Chatre return 0; 2714fa7d9493SBabu Moger 271532f010deSReinette Chatre first_bit = find_first_bit(&val, cbm_len); 271632f010deSReinette Chatre zero_bit = find_next_zero_bit(&val, cbm_len, first_bit); 2717fa7d9493SBabu Moger 2718fa7d9493SBabu Moger /* Clear any remaining bits to ensure contiguous region */ 271932f010deSReinette Chatre bitmap_clear(&val, zero_bit, cbm_len - zero_bit); 27202ef085bdSReinette Chatre return (u32)val; 2721fa7d9493SBabu Moger } 2722fa7d9493SBabu Moger 27237390619aSXiaochen Shen /* 27247390619aSXiaochen Shen * Initialize cache resources per RDT domain 2725fa7d9493SBabu Moger * 27267390619aSXiaochen Shen * Set the RDT domain up to start off with all usable allocations. That is, 27277390619aSXiaochen Shen * all shareable and unused bits. All-zero CBM is invalid. 2728fa7d9493SBabu Moger */ 27291c290682SJames Morse static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s, 27307390619aSXiaochen Shen u32 closid) 2731fa7d9493SBabu Moger { 2732fbc06c69SJames Morse enum resctrl_conf_type peer_type = resctrl_peer_type(s->conf_type); 273375408e43SJames Morse enum resctrl_conf_type t = s->conf_type; 2734e8f72825SJames Morse struct resctrl_staged_config *cfg; 27351c290682SJames Morse struct rdt_resource *r = s->res; 2736fa7d9493SBabu Moger u32 used_b = 0, unused_b = 0; 2737fa7d9493SBabu Moger unsigned long tmp_cbm; 2738fa7d9493SBabu Moger enum rdtgrp_mode mode; 2739f07e9d02SJames Morse u32 peer_ctl, ctrl_val; 27407390619aSXiaochen Shen int i; 2741fa7d9493SBabu Moger 274275408e43SJames Morse cfg = &d->staged_config[t]; 2743e8f72825SJames Morse cfg->have_new_ctrl = false; 2744e8f72825SJames Morse cfg->new_ctrl = r->cache.shareable_bits; 2745fa7d9493SBabu Moger used_b = r->cache.shareable_bits; 2746f07e9d02SJames Morse for (i = 0; i < closids_supported(); i++) { 2747fa7d9493SBabu Moger if (closid_allocated(i) && i != closid) { 2748fa7d9493SBabu Moger mode = rdtgroup_mode_by_closid(i); 2749fa7d9493SBabu Moger if (mode == RDT_MODE_PSEUDO_LOCKSETUP) 275087d3aa28SJames Morse /* 275187d3aa28SJames Morse * ctrl values for locksetup aren't relevant 275287d3aa28SJames Morse * until the schemata is written, and the mode 275387d3aa28SJames Morse * becomes RDT_MODE_PSEUDO_LOCKED. 275487d3aa28SJames Morse */ 275587d3aa28SJames Morse continue; 2756fa7d9493SBabu Moger /* 27577390619aSXiaochen Shen * If CDP is active include peer domain's 27587390619aSXiaochen Shen * usage to ensure there is no overlap 27597390619aSXiaochen Shen * with an exclusive group. 2760fa7d9493SBabu Moger */ 2761fbc06c69SJames Morse if (resctrl_arch_get_cdp_enabled(r->rid)) 2762111136e6SJames Morse peer_ctl = resctrl_arch_get_config(r, d, i, 2763111136e6SJames Morse peer_type); 2764fa7d9493SBabu Moger else 2765fa7d9493SBabu Moger peer_ctl = 0; 2766111136e6SJames Morse ctrl_val = resctrl_arch_get_config(r, d, i, 2767111136e6SJames Morse s->conf_type); 2768f07e9d02SJames Morse used_b |= ctrl_val | peer_ctl; 2769fa7d9493SBabu Moger if (mode == RDT_MODE_SHAREABLE) 2770f07e9d02SJames Morse cfg->new_ctrl |= ctrl_val | peer_ctl; 2771fa7d9493SBabu Moger } 2772fa7d9493SBabu Moger } 2773fa7d9493SBabu Moger if (d->plr && d->plr->cbm > 0) 2774fa7d9493SBabu Moger used_b |= d->plr->cbm; 2775fa7d9493SBabu Moger unused_b = used_b ^ (BIT_MASK(r->cache.cbm_len) - 1); 2776fa7d9493SBabu Moger unused_b &= BIT_MASK(r->cache.cbm_len) - 1; 2777e8f72825SJames Morse cfg->new_ctrl |= unused_b; 2778fa7d9493SBabu Moger /* 2779fa7d9493SBabu Moger * Force the initial CBM to be valid, user can 2780fa7d9493SBabu Moger * modify the CBM based on system availability. 2781fa7d9493SBabu Moger */ 2782e8f72825SJames Morse cfg->new_ctrl = cbm_ensure_valid(cfg->new_ctrl, r); 2783fa7d9493SBabu Moger /* 27847390619aSXiaochen Shen * Assign the u32 CBM to an unsigned long to ensure that 27857390619aSXiaochen Shen * bitmap_weight() does not access out-of-bound memory. 2786fa7d9493SBabu Moger */ 2787e8f72825SJames Morse tmp_cbm = cfg->new_ctrl; 27887390619aSXiaochen Shen if (bitmap_weight(&tmp_cbm, r->cache.cbm_len) < r->cache.min_cbm_bits) { 2789e198fde3SJames Morse rdt_last_cmd_printf("No space on %s:%d\n", s->name, d->id); 2790fa7d9493SBabu Moger return -ENOSPC; 2791fa7d9493SBabu Moger } 2792e8f72825SJames Morse cfg->have_new_ctrl = true; 27937390619aSXiaochen Shen 27947390619aSXiaochen Shen return 0; 27957390619aSXiaochen Shen } 27967390619aSXiaochen Shen 279747820e73SXiaochen Shen /* 279847820e73SXiaochen Shen * Initialize cache resources with default values. 27997390619aSXiaochen Shen * 28007390619aSXiaochen Shen * A new RDT group is being created on an allocation capable (CAT) 28017390619aSXiaochen Shen * supporting system. Set this group up to start off with all usable 28027390619aSXiaochen Shen * allocations. 28037390619aSXiaochen Shen * 28047390619aSXiaochen Shen * If there are no more shareable bits available on any domain then 28057390619aSXiaochen Shen * the entire allocation will fail. 28067390619aSXiaochen Shen */ 28071c290682SJames Morse static int rdtgroup_init_cat(struct resctrl_schema *s, u32 closid) 28087390619aSXiaochen Shen { 28097390619aSXiaochen Shen struct rdt_domain *d; 28107390619aSXiaochen Shen int ret; 28117390619aSXiaochen Shen 28121c290682SJames Morse list_for_each_entry(d, &s->res->domains, list) { 28131c290682SJames Morse ret = __init_one_rdt_domain(d, s, closid); 28147390619aSXiaochen Shen if (ret < 0) 28157390619aSXiaochen Shen return ret; 2816fa7d9493SBabu Moger } 281747820e73SXiaochen Shen 281847820e73SXiaochen Shen return 0; 2819fa7d9493SBabu Moger } 2820fa7d9493SBabu Moger 282147820e73SXiaochen Shen /* Initialize MBA resource with default values. */ 28226ce1560dSJames Morse static void rdtgroup_init_mba(struct rdt_resource *r, u32 closid) 282347820e73SXiaochen Shen { 2824e8f72825SJames Morse struct resctrl_staged_config *cfg; 282547820e73SXiaochen Shen struct rdt_domain *d; 282647820e73SXiaochen Shen 282747820e73SXiaochen Shen list_for_each_entry(d, &r->domains, list) { 28286ce1560dSJames Morse if (is_mba_sc(r)) { 28296ce1560dSJames Morse d->mbps_val[closid] = MBA_MAX_MBPS; 28306ce1560dSJames Morse continue; 28316ce1560dSJames Morse } 28326ce1560dSJames Morse 283375408e43SJames Morse cfg = &d->staged_config[CDP_NONE]; 28346ce1560dSJames Morse cfg->new_ctrl = r->default_ctrl; 2835e8f72825SJames Morse cfg->have_new_ctrl = true; 283647820e73SXiaochen Shen } 283747820e73SXiaochen Shen } 283847820e73SXiaochen Shen 283947820e73SXiaochen Shen /* Initialize the RDT group's allocations. */ 284047820e73SXiaochen Shen static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp) 284147820e73SXiaochen Shen { 2842331ebe4cSJames Morse struct resctrl_schema *s; 284347820e73SXiaochen Shen struct rdt_resource *r; 284447820e73SXiaochen Shen int ret; 284547820e73SXiaochen Shen 2846331ebe4cSJames Morse list_for_each_entry(s, &resctrl_schema_all, list) { 2847331ebe4cSJames Morse r = s->res; 284847820e73SXiaochen Shen if (r->rid == RDT_RESOURCE_MBA) { 28496ce1560dSJames Morse rdtgroup_init_mba(r, rdtgrp->closid); 28506ce1560dSJames Morse if (is_mba_sc(r)) 28516ce1560dSJames Morse continue; 285247820e73SXiaochen Shen } else { 28531c290682SJames Morse ret = rdtgroup_init_cat(s, rdtgrp->closid); 285447820e73SXiaochen Shen if (ret < 0) 285547820e73SXiaochen Shen return ret; 285647820e73SXiaochen Shen } 285747820e73SXiaochen Shen 28582e667819SJames Morse ret = resctrl_arch_update_domains(r, rdtgrp->closid); 2859fa7d9493SBabu Moger if (ret < 0) { 2860723f1a0dSBabu Moger rdt_last_cmd_puts("Failed to initialize allocations\n"); 2861fa7d9493SBabu Moger return ret; 2862fa7d9493SBabu Moger } 286347820e73SXiaochen Shen 2864fa7d9493SBabu Moger } 2865fa7d9493SBabu Moger 286640fba00fSXiaochen Shen rdtgrp->mode = RDT_MODE_SHAREABLE; 286740fba00fSXiaochen Shen 2868fa7d9493SBabu Moger return 0; 2869fa7d9493SBabu Moger } 2870fa7d9493SBabu Moger 2871fa7d9493SBabu Moger static int mkdir_rdt_prepare(struct kernfs_node *parent_kn, 2872fa7d9493SBabu Moger const char *name, umode_t mode, 2873fa7d9493SBabu Moger enum rdt_group_type rtype, struct rdtgroup **r) 2874fa7d9493SBabu Moger { 2875fa7d9493SBabu Moger struct rdtgroup *prdtgrp, *rdtgrp; 2876fa7d9493SBabu Moger struct kernfs_node *kn; 2877fa7d9493SBabu Moger uint files = 0; 2878fa7d9493SBabu Moger int ret; 2879fa7d9493SBabu Moger 2880334b0f4eSXiaochen Shen prdtgrp = rdtgroup_kn_lock_live(parent_kn); 2881fa7d9493SBabu Moger if (!prdtgrp) { 2882fa7d9493SBabu Moger ret = -ENODEV; 2883fa7d9493SBabu Moger goto out_unlock; 2884fa7d9493SBabu Moger } 2885fa7d9493SBabu Moger 2886fa7d9493SBabu Moger if (rtype == RDTMON_GROUP && 2887fa7d9493SBabu Moger (prdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP || 2888fa7d9493SBabu Moger prdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)) { 2889fa7d9493SBabu Moger ret = -EINVAL; 2890723f1a0dSBabu Moger rdt_last_cmd_puts("Pseudo-locking in progress\n"); 2891fa7d9493SBabu Moger goto out_unlock; 2892fa7d9493SBabu Moger } 2893fa7d9493SBabu Moger 2894fa7d9493SBabu Moger /* allocate the rdtgroup. */ 2895fa7d9493SBabu Moger rdtgrp = kzalloc(sizeof(*rdtgrp), GFP_KERNEL); 2896fa7d9493SBabu Moger if (!rdtgrp) { 2897fa7d9493SBabu Moger ret = -ENOSPC; 2898723f1a0dSBabu Moger rdt_last_cmd_puts("Kernel out of memory\n"); 2899fa7d9493SBabu Moger goto out_unlock; 2900fa7d9493SBabu Moger } 2901fa7d9493SBabu Moger *r = rdtgrp; 2902fa7d9493SBabu Moger rdtgrp->mon.parent = prdtgrp; 2903fa7d9493SBabu Moger rdtgrp->type = rtype; 2904fa7d9493SBabu Moger INIT_LIST_HEAD(&rdtgrp->mon.crdtgrp_list); 2905fa7d9493SBabu Moger 2906fa7d9493SBabu Moger /* kernfs creates the directory for rdtgrp */ 2907fa7d9493SBabu Moger kn = kernfs_create_dir(parent_kn, name, mode, rdtgrp); 2908fa7d9493SBabu Moger if (IS_ERR(kn)) { 2909fa7d9493SBabu Moger ret = PTR_ERR(kn); 2910fa7d9493SBabu Moger rdt_last_cmd_puts("kernfs create error\n"); 2911fa7d9493SBabu Moger goto out_free_rgrp; 2912fa7d9493SBabu Moger } 2913fa7d9493SBabu Moger rdtgrp->kn = kn; 2914fa7d9493SBabu Moger 2915fa7d9493SBabu Moger /* 2916fa7d9493SBabu Moger * kernfs_remove() will drop the reference count on "kn" which 2917fa7d9493SBabu Moger * will free it. But we still need it to stick around for the 2918fd8d9db3SXiaochen Shen * rdtgroup_kn_unlock(kn) call. Take one extra reference here, 291975899924SXiaochen Shen * which will be dropped by kernfs_put() in rdtgroup_remove(). 2920fa7d9493SBabu Moger */ 2921fa7d9493SBabu Moger kernfs_get(kn); 2922fa7d9493SBabu Moger 2923fa7d9493SBabu Moger ret = rdtgroup_kn_set_ugid(kn); 2924fa7d9493SBabu Moger if (ret) { 2925fa7d9493SBabu Moger rdt_last_cmd_puts("kernfs perm error\n"); 2926fa7d9493SBabu Moger goto out_destroy; 2927fa7d9493SBabu Moger } 2928fa7d9493SBabu Moger 2929fa7d9493SBabu Moger files = RFTYPE_BASE | BIT(RF_CTRLSHIFT + rtype); 2930fa7d9493SBabu Moger ret = rdtgroup_add_files(kn, files); 2931fa7d9493SBabu Moger if (ret) { 2932fa7d9493SBabu Moger rdt_last_cmd_puts("kernfs fill error\n"); 2933fa7d9493SBabu Moger goto out_destroy; 2934fa7d9493SBabu Moger } 2935fa7d9493SBabu Moger 2936fa7d9493SBabu Moger if (rdt_mon_capable) { 2937fa7d9493SBabu Moger ret = alloc_rmid(); 2938fa7d9493SBabu Moger if (ret < 0) { 2939723f1a0dSBabu Moger rdt_last_cmd_puts("Out of RMIDs\n"); 2940fa7d9493SBabu Moger goto out_destroy; 2941fa7d9493SBabu Moger } 2942fa7d9493SBabu Moger rdtgrp->mon.rmid = ret; 2943fa7d9493SBabu Moger 2944fa7d9493SBabu Moger ret = mkdir_mondata_all(kn, rdtgrp, &rdtgrp->mon.mon_data_kn); 2945fa7d9493SBabu Moger if (ret) { 2946fa7d9493SBabu Moger rdt_last_cmd_puts("kernfs subdir error\n"); 2947fa7d9493SBabu Moger goto out_idfree; 2948fa7d9493SBabu Moger } 2949fa7d9493SBabu Moger } 2950fa7d9493SBabu Moger kernfs_activate(kn); 2951fa7d9493SBabu Moger 2952fa7d9493SBabu Moger /* 2953334b0f4eSXiaochen Shen * The caller unlocks the parent_kn upon success. 2954fa7d9493SBabu Moger */ 2955fa7d9493SBabu Moger return 0; 2956fa7d9493SBabu Moger 2957fa7d9493SBabu Moger out_idfree: 2958fa7d9493SBabu Moger free_rmid(rdtgrp->mon.rmid); 2959fa7d9493SBabu Moger out_destroy: 296075899924SXiaochen Shen kernfs_put(rdtgrp->kn); 2961fa7d9493SBabu Moger kernfs_remove(rdtgrp->kn); 2962fa7d9493SBabu Moger out_free_rgrp: 2963fa7d9493SBabu Moger kfree(rdtgrp); 2964fa7d9493SBabu Moger out_unlock: 2965334b0f4eSXiaochen Shen rdtgroup_kn_unlock(parent_kn); 2966fa7d9493SBabu Moger return ret; 2967fa7d9493SBabu Moger } 2968fa7d9493SBabu Moger 2969fa7d9493SBabu Moger static void mkdir_rdt_prepare_clean(struct rdtgroup *rgrp) 2970fa7d9493SBabu Moger { 2971fa7d9493SBabu Moger kernfs_remove(rgrp->kn); 2972fa7d9493SBabu Moger free_rmid(rgrp->mon.rmid); 297375899924SXiaochen Shen rdtgroup_remove(rgrp); 2974fa7d9493SBabu Moger } 2975fa7d9493SBabu Moger 2976fa7d9493SBabu Moger /* 2977fa7d9493SBabu Moger * Create a monitor group under "mon_groups" directory of a control 2978fa7d9493SBabu Moger * and monitor group(ctrl_mon). This is a resource group 2979fa7d9493SBabu Moger * to monitor a subset of tasks and cpus in its parent ctrl_mon group. 2980fa7d9493SBabu Moger */ 2981fa7d9493SBabu Moger static int rdtgroup_mkdir_mon(struct kernfs_node *parent_kn, 298232ada3b9SXiaochen Shen const char *name, umode_t mode) 2983fa7d9493SBabu Moger { 2984fa7d9493SBabu Moger struct rdtgroup *rdtgrp, *prgrp; 2985fa7d9493SBabu Moger int ret; 2986fa7d9493SBabu Moger 298732ada3b9SXiaochen Shen ret = mkdir_rdt_prepare(parent_kn, name, mode, RDTMON_GROUP, &rdtgrp); 2988fa7d9493SBabu Moger if (ret) 2989fa7d9493SBabu Moger return ret; 2990fa7d9493SBabu Moger 2991fa7d9493SBabu Moger prgrp = rdtgrp->mon.parent; 2992fa7d9493SBabu Moger rdtgrp->closid = prgrp->closid; 2993fa7d9493SBabu Moger 2994fa7d9493SBabu Moger /* 2995fa7d9493SBabu Moger * Add the rdtgrp to the list of rdtgrps the parent 2996fa7d9493SBabu Moger * ctrl_mon group has to track. 2997fa7d9493SBabu Moger */ 2998fa7d9493SBabu Moger list_add_tail(&rdtgrp->mon.crdtgrp_list, &prgrp->mon.crdtgrp_list); 2999fa7d9493SBabu Moger 3000334b0f4eSXiaochen Shen rdtgroup_kn_unlock(parent_kn); 3001fa7d9493SBabu Moger return ret; 3002fa7d9493SBabu Moger } 3003fa7d9493SBabu Moger 3004fa7d9493SBabu Moger /* 3005fa7d9493SBabu Moger * These are rdtgroups created under the root directory. Can be used 3006fa7d9493SBabu Moger * to allocate and monitor resources. 3007fa7d9493SBabu Moger */ 3008fa7d9493SBabu Moger static int rdtgroup_mkdir_ctrl_mon(struct kernfs_node *parent_kn, 3009fa7d9493SBabu Moger const char *name, umode_t mode) 3010fa7d9493SBabu Moger { 3011fa7d9493SBabu Moger struct rdtgroup *rdtgrp; 3012fa7d9493SBabu Moger struct kernfs_node *kn; 3013fa7d9493SBabu Moger u32 closid; 3014fa7d9493SBabu Moger int ret; 3015fa7d9493SBabu Moger 301632ada3b9SXiaochen Shen ret = mkdir_rdt_prepare(parent_kn, name, mode, RDTCTRL_GROUP, &rdtgrp); 3017fa7d9493SBabu Moger if (ret) 3018fa7d9493SBabu Moger return ret; 3019fa7d9493SBabu Moger 3020fa7d9493SBabu Moger kn = rdtgrp->kn; 3021fa7d9493SBabu Moger ret = closid_alloc(); 3022fa7d9493SBabu Moger if (ret < 0) { 3023723f1a0dSBabu Moger rdt_last_cmd_puts("Out of CLOSIDs\n"); 3024fa7d9493SBabu Moger goto out_common_fail; 3025fa7d9493SBabu Moger } 3026fa7d9493SBabu Moger closid = ret; 3027fa7d9493SBabu Moger ret = 0; 3028fa7d9493SBabu Moger 3029fa7d9493SBabu Moger rdtgrp->closid = closid; 3030fa7d9493SBabu Moger ret = rdtgroup_init_alloc(rdtgrp); 3031fa7d9493SBabu Moger if (ret < 0) 3032fa7d9493SBabu Moger goto out_id_free; 3033fa7d9493SBabu Moger 3034fa7d9493SBabu Moger list_add(&rdtgrp->rdtgroup_list, &rdt_all_groups); 3035fa7d9493SBabu Moger 3036fa7d9493SBabu Moger if (rdt_mon_capable) { 3037fa7d9493SBabu Moger /* 3038fa7d9493SBabu Moger * Create an empty mon_groups directory to hold the subset 3039fa7d9493SBabu Moger * of tasks and cpus to monitor. 3040fa7d9493SBabu Moger */ 3041334b0f4eSXiaochen Shen ret = mongroup_create_dir(kn, rdtgrp, "mon_groups", NULL); 3042fa7d9493SBabu Moger if (ret) { 3043fa7d9493SBabu Moger rdt_last_cmd_puts("kernfs subdir error\n"); 3044fa7d9493SBabu Moger goto out_del_list; 3045fa7d9493SBabu Moger } 3046fa7d9493SBabu Moger } 3047fa7d9493SBabu Moger 3048fa7d9493SBabu Moger goto out_unlock; 3049fa7d9493SBabu Moger 3050fa7d9493SBabu Moger out_del_list: 3051fa7d9493SBabu Moger list_del(&rdtgrp->rdtgroup_list); 3052fa7d9493SBabu Moger out_id_free: 3053fa7d9493SBabu Moger closid_free(closid); 3054fa7d9493SBabu Moger out_common_fail: 3055fa7d9493SBabu Moger mkdir_rdt_prepare_clean(rdtgrp); 3056fa7d9493SBabu Moger out_unlock: 3057334b0f4eSXiaochen Shen rdtgroup_kn_unlock(parent_kn); 3058fa7d9493SBabu Moger return ret; 3059fa7d9493SBabu Moger } 3060fa7d9493SBabu Moger 3061fa7d9493SBabu Moger /* 3062fa7d9493SBabu Moger * We allow creating mon groups only with in a directory called "mon_groups" 3063fa7d9493SBabu Moger * which is present in every ctrl_mon group. Check if this is a valid 3064fa7d9493SBabu Moger * "mon_groups" directory. 3065fa7d9493SBabu Moger * 3066fa7d9493SBabu Moger * 1. The directory should be named "mon_groups". 3067fa7d9493SBabu Moger * 2. The mon group itself should "not" be named "mon_groups". 3068fa7d9493SBabu Moger * This makes sure "mon_groups" directory always has a ctrl_mon group 3069fa7d9493SBabu Moger * as parent. 3070fa7d9493SBabu Moger */ 3071fa7d9493SBabu Moger static bool is_mon_groups(struct kernfs_node *kn, const char *name) 3072fa7d9493SBabu Moger { 3073fa7d9493SBabu Moger return (!strcmp(kn->name, "mon_groups") && 3074fa7d9493SBabu Moger strcmp(name, "mon_groups")); 3075fa7d9493SBabu Moger } 3076fa7d9493SBabu Moger 3077fa7d9493SBabu Moger static int rdtgroup_mkdir(struct kernfs_node *parent_kn, const char *name, 3078fa7d9493SBabu Moger umode_t mode) 3079fa7d9493SBabu Moger { 3080fa7d9493SBabu Moger /* Do not accept '\n' to avoid unparsable situation. */ 3081fa7d9493SBabu Moger if (strchr(name, '\n')) 3082fa7d9493SBabu Moger return -EINVAL; 3083fa7d9493SBabu Moger 3084fa7d9493SBabu Moger /* 3085fa7d9493SBabu Moger * If the parent directory is the root directory and RDT 3086fa7d9493SBabu Moger * allocation is supported, add a control and monitoring 3087fa7d9493SBabu Moger * subdirectory 3088fa7d9493SBabu Moger */ 3089fa7d9493SBabu Moger if (rdt_alloc_capable && parent_kn == rdtgroup_default.kn) 309032ada3b9SXiaochen Shen return rdtgroup_mkdir_ctrl_mon(parent_kn, name, mode); 3091fa7d9493SBabu Moger 3092fa7d9493SBabu Moger /* 3093fa7d9493SBabu Moger * If RDT monitoring is supported and the parent directory is a valid 3094fa7d9493SBabu Moger * "mon_groups" directory, add a monitoring subdirectory. 3095fa7d9493SBabu Moger */ 3096fa7d9493SBabu Moger if (rdt_mon_capable && is_mon_groups(parent_kn, name)) 309732ada3b9SXiaochen Shen return rdtgroup_mkdir_mon(parent_kn, name, mode); 3098fa7d9493SBabu Moger 3099fa7d9493SBabu Moger return -EPERM; 3100fa7d9493SBabu Moger } 3101fa7d9493SBabu Moger 310219eb86a7SXiaochen Shen static int rdtgroup_rmdir_mon(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask) 3103fa7d9493SBabu Moger { 3104fa7d9493SBabu Moger struct rdtgroup *prdtgrp = rdtgrp->mon.parent; 3105fa7d9493SBabu Moger int cpu; 3106fa7d9493SBabu Moger 3107fa7d9493SBabu Moger /* Give any tasks back to the parent group */ 3108fa7d9493SBabu Moger rdt_move_group_tasks(rdtgrp, prdtgrp, tmpmask); 3109fa7d9493SBabu Moger 3110fa7d9493SBabu Moger /* Update per cpu rmid of the moved CPUs first */ 3111fa7d9493SBabu Moger for_each_cpu(cpu, &rdtgrp->cpu_mask) 3112fa7d9493SBabu Moger per_cpu(pqr_state.default_rmid, cpu) = prdtgrp->mon.rmid; 3113fa7d9493SBabu Moger /* 3114fa7d9493SBabu Moger * Update the MSR on moved CPUs and CPUs which have moved 3115fa7d9493SBabu Moger * task running on them. 3116fa7d9493SBabu Moger */ 3117fa7d9493SBabu Moger cpumask_or(tmpmask, tmpmask, &rdtgrp->cpu_mask); 3118fa7d9493SBabu Moger update_closid_rmid(tmpmask, NULL); 3119fa7d9493SBabu Moger 3120fa7d9493SBabu Moger rdtgrp->flags = RDT_DELETED; 3121fa7d9493SBabu Moger free_rmid(rdtgrp->mon.rmid); 3122fa7d9493SBabu Moger 3123fa7d9493SBabu Moger /* 3124fa7d9493SBabu Moger * Remove the rdtgrp from the parent ctrl_mon group's list 3125fa7d9493SBabu Moger */ 3126fa7d9493SBabu Moger WARN_ON(list_empty(&prdtgrp->mon.crdtgrp_list)); 3127fa7d9493SBabu Moger list_del(&rdtgrp->mon.crdtgrp_list); 3128fa7d9493SBabu Moger 3129fa7d9493SBabu Moger kernfs_remove(rdtgrp->kn); 3130fa7d9493SBabu Moger 3131fa7d9493SBabu Moger return 0; 3132fa7d9493SBabu Moger } 3133fa7d9493SBabu Moger 313419eb86a7SXiaochen Shen static int rdtgroup_ctrl_remove(struct rdtgroup *rdtgrp) 3135fa7d9493SBabu Moger { 3136fa7d9493SBabu Moger rdtgrp->flags = RDT_DELETED; 3137fa7d9493SBabu Moger list_del(&rdtgrp->rdtgroup_list); 3138fa7d9493SBabu Moger 3139fa7d9493SBabu Moger kernfs_remove(rdtgrp->kn); 3140fa7d9493SBabu Moger return 0; 3141fa7d9493SBabu Moger } 3142fa7d9493SBabu Moger 314319eb86a7SXiaochen Shen static int rdtgroup_rmdir_ctrl(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask) 3144fa7d9493SBabu Moger { 3145fa7d9493SBabu Moger int cpu; 3146fa7d9493SBabu Moger 3147fa7d9493SBabu Moger /* Give any tasks back to the default group */ 3148fa7d9493SBabu Moger rdt_move_group_tasks(rdtgrp, &rdtgroup_default, tmpmask); 3149fa7d9493SBabu Moger 3150fa7d9493SBabu Moger /* Give any CPUs back to the default group */ 3151fa7d9493SBabu Moger cpumask_or(&rdtgroup_default.cpu_mask, 3152fa7d9493SBabu Moger &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask); 3153fa7d9493SBabu Moger 3154fa7d9493SBabu Moger /* Update per cpu closid and rmid of the moved CPUs first */ 3155fa7d9493SBabu Moger for_each_cpu(cpu, &rdtgrp->cpu_mask) { 3156fa7d9493SBabu Moger per_cpu(pqr_state.default_closid, cpu) = rdtgroup_default.closid; 3157fa7d9493SBabu Moger per_cpu(pqr_state.default_rmid, cpu) = rdtgroup_default.mon.rmid; 3158fa7d9493SBabu Moger } 3159fa7d9493SBabu Moger 3160fa7d9493SBabu Moger /* 3161fa7d9493SBabu Moger * Update the MSR on moved CPUs and CPUs which have moved 3162fa7d9493SBabu Moger * task running on them. 3163fa7d9493SBabu Moger */ 3164fa7d9493SBabu Moger cpumask_or(tmpmask, tmpmask, &rdtgrp->cpu_mask); 3165fa7d9493SBabu Moger update_closid_rmid(tmpmask, NULL); 3166fa7d9493SBabu Moger 3167fa7d9493SBabu Moger closid_free(rdtgrp->closid); 3168fa7d9493SBabu Moger free_rmid(rdtgrp->mon.rmid); 3169fa7d9493SBabu Moger 317019eb86a7SXiaochen Shen rdtgroup_ctrl_remove(rdtgrp); 3171074fadeeSXiaochen Shen 3172fa7d9493SBabu Moger /* 3173fa7d9493SBabu Moger * Free all the child monitor group rmids. 3174fa7d9493SBabu Moger */ 3175fa7d9493SBabu Moger free_all_child_rdtgrp(rdtgrp); 3176fa7d9493SBabu Moger 3177fa7d9493SBabu Moger return 0; 3178fa7d9493SBabu Moger } 3179fa7d9493SBabu Moger 3180fa7d9493SBabu Moger static int rdtgroup_rmdir(struct kernfs_node *kn) 3181fa7d9493SBabu Moger { 3182fa7d9493SBabu Moger struct kernfs_node *parent_kn = kn->parent; 3183fa7d9493SBabu Moger struct rdtgroup *rdtgrp; 3184fa7d9493SBabu Moger cpumask_var_t tmpmask; 3185fa7d9493SBabu Moger int ret = 0; 3186fa7d9493SBabu Moger 3187fa7d9493SBabu Moger if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL)) 3188fa7d9493SBabu Moger return -ENOMEM; 3189fa7d9493SBabu Moger 3190fa7d9493SBabu Moger rdtgrp = rdtgroup_kn_lock_live(kn); 3191fa7d9493SBabu Moger if (!rdtgrp) { 3192fa7d9493SBabu Moger ret = -EPERM; 3193fa7d9493SBabu Moger goto out; 3194fa7d9493SBabu Moger } 3195fa7d9493SBabu Moger 3196fa7d9493SBabu Moger /* 3197fa7d9493SBabu Moger * If the rdtgroup is a ctrl_mon group and parent directory 3198fa7d9493SBabu Moger * is the root directory, remove the ctrl_mon group. 3199fa7d9493SBabu Moger * 3200fa7d9493SBabu Moger * If the rdtgroup is a mon group and parent directory 3201fa7d9493SBabu Moger * is a valid "mon_groups" directory, remove the mon group. 3202fa7d9493SBabu Moger */ 3203b0151da5SReinette Chatre if (rdtgrp->type == RDTCTRL_GROUP && parent_kn == rdtgroup_default.kn && 3204b0151da5SReinette Chatre rdtgrp != &rdtgroup_default) { 3205fa7d9493SBabu Moger if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP || 3206fa7d9493SBabu Moger rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) { 320719eb86a7SXiaochen Shen ret = rdtgroup_ctrl_remove(rdtgrp); 3208fa7d9493SBabu Moger } else { 320919eb86a7SXiaochen Shen ret = rdtgroup_rmdir_ctrl(rdtgrp, tmpmask); 3210fa7d9493SBabu Moger } 3211fa7d9493SBabu Moger } else if (rdtgrp->type == RDTMON_GROUP && 3212fa7d9493SBabu Moger is_mon_groups(parent_kn, kn->name)) { 321319eb86a7SXiaochen Shen ret = rdtgroup_rmdir_mon(rdtgrp, tmpmask); 3214fa7d9493SBabu Moger } else { 3215fa7d9493SBabu Moger ret = -EPERM; 3216fa7d9493SBabu Moger } 3217fa7d9493SBabu Moger 3218fa7d9493SBabu Moger out: 3219fa7d9493SBabu Moger rdtgroup_kn_unlock(kn); 3220fa7d9493SBabu Moger free_cpumask_var(tmpmask); 3221fa7d9493SBabu Moger return ret; 3222fa7d9493SBabu Moger } 3223fa7d9493SBabu Moger 3224fa7d9493SBabu Moger static int rdtgroup_show_options(struct seq_file *seq, struct kernfs_root *kf) 3225fa7d9493SBabu Moger { 3226c091e907SJames Morse if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3)) 3227fa7d9493SBabu Moger seq_puts(seq, ",cdp"); 3228fa7d9493SBabu Moger 3229c091e907SJames Morse if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2)) 3230fa7d9493SBabu Moger seq_puts(seq, ",cdpl2"); 3231fa7d9493SBabu Moger 323263c8b123SJames Morse if (is_mba_sc(&rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl)) 3233fa7d9493SBabu Moger seq_puts(seq, ",mba_MBps"); 3234fa7d9493SBabu Moger 3235fa7d9493SBabu Moger return 0; 3236fa7d9493SBabu Moger } 3237fa7d9493SBabu Moger 3238fa7d9493SBabu Moger static struct kernfs_syscall_ops rdtgroup_kf_syscall_ops = { 3239fa7d9493SBabu Moger .mkdir = rdtgroup_mkdir, 3240fa7d9493SBabu Moger .rmdir = rdtgroup_rmdir, 3241fa7d9493SBabu Moger .show_options = rdtgroup_show_options, 3242fa7d9493SBabu Moger }; 3243fa7d9493SBabu Moger 3244fa7d9493SBabu Moger static int __init rdtgroup_setup_root(void) 3245fa7d9493SBabu Moger { 3246fa7d9493SBabu Moger int ret; 3247fa7d9493SBabu Moger 3248fa7d9493SBabu Moger rdt_root = kernfs_create_root(&rdtgroup_kf_syscall_ops, 3249fa7d9493SBabu Moger KERNFS_ROOT_CREATE_DEACTIVATED | 3250fa7d9493SBabu Moger KERNFS_ROOT_EXTRA_OPEN_PERM_CHECK, 3251fa7d9493SBabu Moger &rdtgroup_default); 3252fa7d9493SBabu Moger if (IS_ERR(rdt_root)) 3253fa7d9493SBabu Moger return PTR_ERR(rdt_root); 3254fa7d9493SBabu Moger 3255fa7d9493SBabu Moger mutex_lock(&rdtgroup_mutex); 3256fa7d9493SBabu Moger 3257fa7d9493SBabu Moger rdtgroup_default.closid = 0; 3258fa7d9493SBabu Moger rdtgroup_default.mon.rmid = 0; 3259fa7d9493SBabu Moger rdtgroup_default.type = RDTCTRL_GROUP; 3260fa7d9493SBabu Moger INIT_LIST_HEAD(&rdtgroup_default.mon.crdtgrp_list); 3261fa7d9493SBabu Moger 3262fa7d9493SBabu Moger list_add(&rdtgroup_default.rdtgroup_list, &rdt_all_groups); 3263fa7d9493SBabu Moger 3264f2eb478fSGreg Kroah-Hartman ret = rdtgroup_add_files(kernfs_root_to_node(rdt_root), RF_CTRL_BASE); 3265fa7d9493SBabu Moger if (ret) { 3266fa7d9493SBabu Moger kernfs_destroy_root(rdt_root); 3267fa7d9493SBabu Moger goto out; 3268fa7d9493SBabu Moger } 3269fa7d9493SBabu Moger 3270f2eb478fSGreg Kroah-Hartman rdtgroup_default.kn = kernfs_root_to_node(rdt_root); 3271fa7d9493SBabu Moger kernfs_activate(rdtgroup_default.kn); 3272fa7d9493SBabu Moger 3273fa7d9493SBabu Moger out: 3274fa7d9493SBabu Moger mutex_unlock(&rdtgroup_mutex); 3275fa7d9493SBabu Moger 3276fa7d9493SBabu Moger return ret; 3277fa7d9493SBabu Moger } 3278fa7d9493SBabu Moger 3279798fd4b9SJames Morse static void domain_destroy_mon_state(struct rdt_domain *d) 3280798fd4b9SJames Morse { 3281798fd4b9SJames Morse bitmap_free(d->rmid_busy_llc); 3282798fd4b9SJames Morse kfree(d->mbm_total); 3283798fd4b9SJames Morse kfree(d->mbm_local); 3284798fd4b9SJames Morse } 3285798fd4b9SJames Morse 3286798fd4b9SJames Morse void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d) 3287798fd4b9SJames Morse { 3288798fd4b9SJames Morse lockdep_assert_held(&rdtgroup_mutex); 3289798fd4b9SJames Morse 3290781096d9SJames Morse if (supports_mba_mbps() && r->rid == RDT_RESOURCE_MBA) 3291781096d9SJames Morse mba_sc_domain_destroy(r, d); 3292781096d9SJames Morse 3293798fd4b9SJames Morse if (!r->mon_capable) 3294798fd4b9SJames Morse return; 3295798fd4b9SJames Morse 3296798fd4b9SJames Morse /* 3297798fd4b9SJames Morse * If resctrl is mounted, remove all the 3298798fd4b9SJames Morse * per domain monitor data directories. 3299798fd4b9SJames Morse */ 3300798fd4b9SJames Morse if (static_branch_unlikely(&rdt_mon_enable_key)) 3301798fd4b9SJames Morse rmdir_mondata_subdir_allrdtgrp(r, d->id); 3302798fd4b9SJames Morse 3303798fd4b9SJames Morse if (is_mbm_enabled()) 3304798fd4b9SJames Morse cancel_delayed_work(&d->mbm_over); 3305798fd4b9SJames Morse if (is_llc_occupancy_enabled() && has_busy_rmid(r, d)) { 3306798fd4b9SJames Morse /* 3307798fd4b9SJames Morse * When a package is going down, forcefully 3308798fd4b9SJames Morse * decrement rmid->ebusy. There is no way to know 3309798fd4b9SJames Morse * that the L3 was flushed and hence may lead to 3310798fd4b9SJames Morse * incorrect counts in rare scenarios, but leaving 3311798fd4b9SJames Morse * the RMID as busy creates RMID leaks if the 3312798fd4b9SJames Morse * package never comes back. 3313798fd4b9SJames Morse */ 3314798fd4b9SJames Morse __check_limbo(d, true); 3315798fd4b9SJames Morse cancel_delayed_work(&d->cqm_limbo); 3316798fd4b9SJames Morse } 3317798fd4b9SJames Morse 3318798fd4b9SJames Morse domain_destroy_mon_state(d); 3319798fd4b9SJames Morse } 3320798fd4b9SJames Morse 33213a7232cdSJames Morse static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_domain *d) 33223a7232cdSJames Morse { 33233a7232cdSJames Morse size_t tsize; 33243a7232cdSJames Morse 33253a7232cdSJames Morse if (is_llc_occupancy_enabled()) { 33263a7232cdSJames Morse d->rmid_busy_llc = bitmap_zalloc(r->num_rmid, GFP_KERNEL); 33273a7232cdSJames Morse if (!d->rmid_busy_llc) 33283a7232cdSJames Morse return -ENOMEM; 33293a7232cdSJames Morse } 33303a7232cdSJames Morse if (is_mbm_total_enabled()) { 33313a7232cdSJames Morse tsize = sizeof(*d->mbm_total); 33323a7232cdSJames Morse d->mbm_total = kcalloc(r->num_rmid, tsize, GFP_KERNEL); 33333a7232cdSJames Morse if (!d->mbm_total) { 33343a7232cdSJames Morse bitmap_free(d->rmid_busy_llc); 33353a7232cdSJames Morse return -ENOMEM; 33363a7232cdSJames Morse } 33373a7232cdSJames Morse } 33383a7232cdSJames Morse if (is_mbm_local_enabled()) { 33393a7232cdSJames Morse tsize = sizeof(*d->mbm_local); 33403a7232cdSJames Morse d->mbm_local = kcalloc(r->num_rmid, tsize, GFP_KERNEL); 33413a7232cdSJames Morse if (!d->mbm_local) { 33423a7232cdSJames Morse bitmap_free(d->rmid_busy_llc); 33433a7232cdSJames Morse kfree(d->mbm_total); 33443a7232cdSJames Morse return -ENOMEM; 33453a7232cdSJames Morse } 33463a7232cdSJames Morse } 33473a7232cdSJames Morse 33483a7232cdSJames Morse return 0; 33493a7232cdSJames Morse } 33503a7232cdSJames Morse 33513a7232cdSJames Morse int resctrl_online_domain(struct rdt_resource *r, struct rdt_domain *d) 33523a7232cdSJames Morse { 33533a7232cdSJames Morse int err; 33543a7232cdSJames Morse 33553a7232cdSJames Morse lockdep_assert_held(&rdtgroup_mutex); 33563a7232cdSJames Morse 3357781096d9SJames Morse if (supports_mba_mbps() && r->rid == RDT_RESOURCE_MBA) 3358781096d9SJames Morse /* RDT_RESOURCE_MBA is never mon_capable */ 3359781096d9SJames Morse return mba_sc_domain_allocate(r, d); 3360781096d9SJames Morse 33613a7232cdSJames Morse if (!r->mon_capable) 33623a7232cdSJames Morse return 0; 33633a7232cdSJames Morse 33643a7232cdSJames Morse err = domain_setup_mon_state(r, d); 33653a7232cdSJames Morse if (err) 33663a7232cdSJames Morse return err; 33673a7232cdSJames Morse 33683a7232cdSJames Morse if (is_mbm_enabled()) { 33693a7232cdSJames Morse INIT_DELAYED_WORK(&d->mbm_over, mbm_handle_overflow); 33703a7232cdSJames Morse mbm_setup_overflow_handler(d, MBM_OVERFLOW_INTERVAL); 33713a7232cdSJames Morse } 33723a7232cdSJames Morse 33733a7232cdSJames Morse if (is_llc_occupancy_enabled()) 33743a7232cdSJames Morse INIT_DELAYED_WORK(&d->cqm_limbo, cqm_handle_limbo); 33753a7232cdSJames Morse 33763a7232cdSJames Morse /* If resctrl is mounted, add per domain monitor data directories. */ 33773a7232cdSJames Morse if (static_branch_unlikely(&rdt_mon_enable_key)) 33783a7232cdSJames Morse mkdir_mondata_subdir_allrdtgrp(r, d); 33793a7232cdSJames Morse 33803a7232cdSJames Morse return 0; 33813a7232cdSJames Morse } 33823a7232cdSJames Morse 3383fa7d9493SBabu Moger /* 3384fa7d9493SBabu Moger * rdtgroup_init - rdtgroup initialization 3385fa7d9493SBabu Moger * 3386fa7d9493SBabu Moger * Setup resctrl file system including set up root, create mount point, 3387fa7d9493SBabu Moger * register rdtgroup filesystem, and initialize files under root directory. 3388fa7d9493SBabu Moger * 3389fa7d9493SBabu Moger * Return: 0 on success or -errno 3390fa7d9493SBabu Moger */ 3391fa7d9493SBabu Moger int __init rdtgroup_init(void) 3392fa7d9493SBabu Moger { 3393fa7d9493SBabu Moger int ret = 0; 3394fa7d9493SBabu Moger 3395fa7d9493SBabu Moger seq_buf_init(&last_cmd_status, last_cmd_status_buf, 3396fa7d9493SBabu Moger sizeof(last_cmd_status_buf)); 3397fa7d9493SBabu Moger 3398fa7d9493SBabu Moger ret = rdtgroup_setup_root(); 3399fa7d9493SBabu Moger if (ret) 3400fa7d9493SBabu Moger return ret; 3401fa7d9493SBabu Moger 3402fa7d9493SBabu Moger ret = sysfs_create_mount_point(fs_kobj, "resctrl"); 3403fa7d9493SBabu Moger if (ret) 3404fa7d9493SBabu Moger goto cleanup_root; 3405fa7d9493SBabu Moger 3406fa7d9493SBabu Moger ret = register_filesystem(&rdt_fs_type); 3407fa7d9493SBabu Moger if (ret) 3408fa7d9493SBabu Moger goto cleanup_mountpoint; 3409fa7d9493SBabu Moger 3410fa7d9493SBabu Moger /* 3411fa7d9493SBabu Moger * Adding the resctrl debugfs directory here may not be ideal since 3412fa7d9493SBabu Moger * it would let the resctrl debugfs directory appear on the debugfs 3413fa7d9493SBabu Moger * filesystem before the resctrl filesystem is mounted. 3414fa7d9493SBabu Moger * It may also be ok since that would enable debugging of RDT before 3415fa7d9493SBabu Moger * resctrl is mounted. 3416fa7d9493SBabu Moger * The reason why the debugfs directory is created here and not in 3417ae0fbeddSJames Morse * rdt_get_tree() is because rdt_get_tree() takes rdtgroup_mutex and 3418fa7d9493SBabu Moger * during the debugfs directory creation also &sb->s_type->i_mutex_key 3419fa7d9493SBabu Moger * (the lockdep class of inode->i_rwsem). Other filesystem 3420fa7d9493SBabu Moger * interactions (eg. SyS_getdents) have the lock ordering: 3421c1e8d7c6SMichel Lespinasse * &sb->s_type->i_mutex_key --> &mm->mmap_lock 3422c1e8d7c6SMichel Lespinasse * During mmap(), called with &mm->mmap_lock, the rdtgroup_mutex 3423fa7d9493SBabu Moger * is taken, thus creating dependency: 3424c1e8d7c6SMichel Lespinasse * &mm->mmap_lock --> rdtgroup_mutex for the latter that can cause 3425fa7d9493SBabu Moger * issues considering the other two lock dependencies. 3426fa7d9493SBabu Moger * By creating the debugfs directory here we avoid a dependency 3427fa7d9493SBabu Moger * that may cause deadlock (even though file operations cannot 3428fa7d9493SBabu Moger * occur until the filesystem is mounted, but I do not know how to 3429fa7d9493SBabu Moger * tell lockdep that). 3430fa7d9493SBabu Moger */ 3431fa7d9493SBabu Moger debugfs_resctrl = debugfs_create_dir("resctrl", NULL); 3432fa7d9493SBabu Moger 3433fa7d9493SBabu Moger return 0; 3434fa7d9493SBabu Moger 3435fa7d9493SBabu Moger cleanup_mountpoint: 3436fa7d9493SBabu Moger sysfs_remove_mount_point(fs_kobj, "resctrl"); 3437fa7d9493SBabu Moger cleanup_root: 3438fa7d9493SBabu Moger kernfs_destroy_root(rdt_root); 3439fa7d9493SBabu Moger 3440fa7d9493SBabu Moger return ret; 3441fa7d9493SBabu Moger } 3442fa7d9493SBabu Moger 3443fa7d9493SBabu Moger void __exit rdtgroup_exit(void) 3444fa7d9493SBabu Moger { 3445fa7d9493SBabu Moger debugfs_remove_recursive(debugfs_resctrl); 3446fa7d9493SBabu Moger unregister_filesystem(&rdt_fs_type); 3447fa7d9493SBabu Moger sysfs_remove_mount_point(fs_kobj, "resctrl"); 3448fa7d9493SBabu Moger kernfs_destroy_root(rdt_root); 3449fa7d9493SBabu Moger } 3450