150352fa7SAlexander Shishkin // SPDX-License-Identifier: GPL-2.0 2ba82664cSAlexander Shishkin /* 3ba82664cSAlexander Shishkin * Intel(R) Trace Hub Memory Storage Unit 4ba82664cSAlexander Shishkin * 5ba82664cSAlexander Shishkin * Copyright (C) 2014-2015 Intel Corporation. 6ba82664cSAlexander Shishkin */ 7ba82664cSAlexander Shishkin 8ba82664cSAlexander Shishkin #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9ba82664cSAlexander Shishkin 10ba82664cSAlexander Shishkin #include <linux/types.h> 11ba82664cSAlexander Shishkin #include <linux/module.h> 12ba82664cSAlexander Shishkin #include <linux/device.h> 13ba82664cSAlexander Shishkin #include <linux/uaccess.h> 14ba82664cSAlexander Shishkin #include <linux/sizes.h> 15ba82664cSAlexander Shishkin #include <linux/printk.h> 16ba82664cSAlexander Shishkin #include <linux/slab.h> 17ba82664cSAlexander Shishkin #include <linux/mm.h> 18ba82664cSAlexander Shishkin #include <linux/fs.h> 19ba82664cSAlexander Shishkin #include <linux/io.h> 20615c164dSAlexander Shishkin #include <linux/workqueue.h> 21ba82664cSAlexander Shishkin #include <linux/dma-mapping.h> 22ba82664cSAlexander Shishkin 230c14dac9SLaura Abbott #ifdef CONFIG_X86 240c14dac9SLaura Abbott #include <asm/set_memory.h> 250c14dac9SLaura Abbott #endif 26ba82664cSAlexander Shishkin 27615c164dSAlexander Shishkin #include <linux/intel_th.h> 28ba82664cSAlexander Shishkin #include "intel_th.h" 29ba82664cSAlexander Shishkin #include "msu.h" 30ba82664cSAlexander Shishkin 31ba82664cSAlexander Shishkin #define msc_dev(x) (&(x)->thdev->dev) 32ba82664cSAlexander Shishkin 33615c164dSAlexander Shishkin /* 34615c164dSAlexander Shishkin * Lockout state transitions: 35615c164dSAlexander Shishkin * READY -> INUSE -+-> LOCKED -+-> READY -> etc. 36615c164dSAlexander Shishkin * \-----------/ 37615c164dSAlexander Shishkin * WIN_READY: window can be used by HW 38615c164dSAlexander Shishkin * WIN_INUSE: window is in use 39615c164dSAlexander Shishkin * WIN_LOCKED: window is filled up and is being processed by the buffer 40615c164dSAlexander Shishkin * handling code 41615c164dSAlexander Shishkin * 42615c164dSAlexander Shishkin * All state transitions happen automatically, except for the LOCKED->READY, 43615c164dSAlexander Shishkin * which needs to be signalled by the buffer code by calling 44615c164dSAlexander Shishkin * intel_th_msc_window_unlock(). 45615c164dSAlexander Shishkin * 46615c164dSAlexander Shishkin * When the interrupt handler has to switch to the next window, it checks 47615c164dSAlexander Shishkin * whether it's READY, and if it is, it performs the switch and tracing 48615c164dSAlexander Shishkin * continues. If it's LOCKED, it stops the trace. 49615c164dSAlexander Shishkin */ 50615c164dSAlexander Shishkin enum lockout_state { 51615c164dSAlexander Shishkin WIN_READY = 0, 52615c164dSAlexander Shishkin WIN_INUSE, 53615c164dSAlexander Shishkin WIN_LOCKED 54615c164dSAlexander Shishkin }; 55615c164dSAlexander Shishkin 56ba82664cSAlexander Shishkin /** 57ba82664cSAlexander Shishkin * struct msc_window - multiblock mode window descriptor 58ba82664cSAlexander Shishkin * @entry: window list linkage (msc::win_list) 59ba82664cSAlexander Shishkin * @pgoff: page offset into the buffer that this window starts at 60615c164dSAlexander Shishkin * @lockout: lockout state, see comment below 61615c164dSAlexander Shishkin * @lo_lock: lockout state serialization 62ba82664cSAlexander Shishkin * @nr_blocks: number of blocks (pages) in this window 63fa52b3feSAlexander Shishkin * @nr_segs: number of segments in this window (<= @nr_blocks) 64bbbc08a1SAlexander Shishkin * @_sgt: array of block descriptors 65ba39bd83SAlexander Shishkin * @sgt: array of block descriptors 66ba82664cSAlexander Shishkin */ 67ba82664cSAlexander Shishkin struct msc_window { 68ba82664cSAlexander Shishkin struct list_head entry; 69ba82664cSAlexander Shishkin unsigned long pgoff; 70615c164dSAlexander Shishkin enum lockout_state lockout; 71615c164dSAlexander Shishkin spinlock_t lo_lock; 72ba82664cSAlexander Shishkin unsigned int nr_blocks; 73fa52b3feSAlexander Shishkin unsigned int nr_segs; 74ba82664cSAlexander Shishkin struct msc *msc; 75bbbc08a1SAlexander Shishkin struct sg_table _sgt; 76bbbc08a1SAlexander Shishkin struct sg_table *sgt; 77ba82664cSAlexander Shishkin }; 78ba82664cSAlexander Shishkin 79ba82664cSAlexander Shishkin /** 80ba82664cSAlexander Shishkin * struct msc_iter - iterator for msc buffer 81ba82664cSAlexander Shishkin * @entry: msc::iter_list linkage 82ba82664cSAlexander Shishkin * @msc: pointer to the MSC device 83ba82664cSAlexander Shishkin * @start_win: oldest window 84ba82664cSAlexander Shishkin * @win: current window 85ba82664cSAlexander Shishkin * @offset: current logical offset into the buffer 86ba82664cSAlexander Shishkin * @start_block: oldest block in the window 87ba82664cSAlexander Shishkin * @block: block number in the window 88ba82664cSAlexander Shishkin * @block_off: offset into current block 89ba82664cSAlexander Shishkin * @wrap_count: block wrapping handling 90ba82664cSAlexander Shishkin * @eof: end of buffer reached 91ba82664cSAlexander Shishkin */ 92ba82664cSAlexander Shishkin struct msc_iter { 93ba82664cSAlexander Shishkin struct list_head entry; 94ba82664cSAlexander Shishkin struct msc *msc; 95ba82664cSAlexander Shishkin struct msc_window *start_win; 96ba82664cSAlexander Shishkin struct msc_window *win; 97ba82664cSAlexander Shishkin unsigned long offset; 9857b69a1fSAlexander Shishkin struct scatterlist *start_block; 9957b69a1fSAlexander Shishkin struct scatterlist *block; 100ba82664cSAlexander Shishkin unsigned int block_off; 101ba82664cSAlexander Shishkin unsigned int wrap_count; 102ba82664cSAlexander Shishkin unsigned int eof; 103ba82664cSAlexander Shishkin }; 104ba82664cSAlexander Shishkin 105ba82664cSAlexander Shishkin /** 106ba82664cSAlexander Shishkin * struct msc - MSC device representation 107ba82664cSAlexander Shishkin * @reg_base: register window base address 108ba82664cSAlexander Shishkin * @thdev: intel_th_device pointer 109615c164dSAlexander Shishkin * @mbuf: MSU buffer, if assigned 110615c164dSAlexander Shishkin * @mbuf_priv MSU buffer's private data, if @mbuf 111ba82664cSAlexander Shishkin * @win_list: list of windows in multiblock mode 1124e0eaf23SAlexander Shishkin * @single_sgt: single mode buffer 113aad14ad3SAlexander Shishkin * @cur_win: current window 114ba82664cSAlexander Shishkin * @nr_pages: total number of pages allocated for this buffer 115ba82664cSAlexander Shishkin * @single_sz: amount of data in single mode 116ba82664cSAlexander Shishkin * @single_wrap: single mode wrap occurred 117ba82664cSAlexander Shishkin * @base: buffer's base pointer 118ba82664cSAlexander Shishkin * @base_addr: buffer's base address 119ba82664cSAlexander Shishkin * @user_count: number of users of the buffer 120ba82664cSAlexander Shishkin * @mmap_count: number of mappings 121ba82664cSAlexander Shishkin * @buf_mutex: mutex to serialize access to buffer-related bits 122ba82664cSAlexander Shishkin 123ba82664cSAlexander Shishkin * @enabled: MSC is enabled 124ba82664cSAlexander Shishkin * @wrap: wrapping is enabled 125ba82664cSAlexander Shishkin * @mode: MSC operating mode 126ba82664cSAlexander Shishkin * @burst_len: write burst length 127ba82664cSAlexander Shishkin * @index: number of this MSC in the MSU 128ba82664cSAlexander Shishkin */ 129ba82664cSAlexander Shishkin struct msc { 130ba82664cSAlexander Shishkin void __iomem *reg_base; 131aac8da65SAlexander Shishkin void __iomem *msu_base; 132ba82664cSAlexander Shishkin struct intel_th_device *thdev; 133ba82664cSAlexander Shishkin 134615c164dSAlexander Shishkin const struct msu_buffer *mbuf; 135615c164dSAlexander Shishkin void *mbuf_priv; 136615c164dSAlexander Shishkin 137615c164dSAlexander Shishkin struct work_struct work; 138ba82664cSAlexander Shishkin struct list_head win_list; 1394e0eaf23SAlexander Shishkin struct sg_table single_sgt; 140aad14ad3SAlexander Shishkin struct msc_window *cur_win; 141ba82664cSAlexander Shishkin unsigned long nr_pages; 142ba82664cSAlexander Shishkin unsigned long single_sz; 143ba82664cSAlexander Shishkin unsigned int single_wrap : 1; 144ba82664cSAlexander Shishkin void *base; 145ba82664cSAlexander Shishkin dma_addr_t base_addr; 146092f47c3SAlexander Shishkin u32 orig_addr; 147092f47c3SAlexander Shishkin u32 orig_sz; 148ba82664cSAlexander Shishkin 149ba82664cSAlexander Shishkin /* <0: no buffer, 0: no users, >0: active users */ 150ba82664cSAlexander Shishkin atomic_t user_count; 151ba82664cSAlexander Shishkin 152ba82664cSAlexander Shishkin atomic_t mmap_count; 153ba82664cSAlexander Shishkin struct mutex buf_mutex; 154ba82664cSAlexander Shishkin 155ba82664cSAlexander Shishkin struct list_head iter_list; 156ba82664cSAlexander Shishkin 157ba82664cSAlexander Shishkin /* config */ 158ba82664cSAlexander Shishkin unsigned int enabled : 1, 159aac8da65SAlexander Shishkin wrap : 1, 160aac8da65SAlexander Shishkin do_irq : 1; 161ba82664cSAlexander Shishkin unsigned int mode; 162ba82664cSAlexander Shishkin unsigned int burst_len; 163ba82664cSAlexander Shishkin unsigned int index; 164ba82664cSAlexander Shishkin }; 165ba82664cSAlexander Shishkin 166615c164dSAlexander Shishkin static LIST_HEAD(msu_buffer_list); 167e5a340f7SAlexander Shishkin static DEFINE_MUTEX(msu_buffer_mutex); 168615c164dSAlexander Shishkin 169615c164dSAlexander Shishkin /** 170615c164dSAlexander Shishkin * struct msu_buffer_entry - internal MSU buffer bookkeeping 171615c164dSAlexander Shishkin * @entry: link to msu_buffer_list 172615c164dSAlexander Shishkin * @mbuf: MSU buffer object 173615c164dSAlexander Shishkin * @owner: module that provides this MSU buffer 174615c164dSAlexander Shishkin */ 175615c164dSAlexander Shishkin struct msu_buffer_entry { 176615c164dSAlexander Shishkin struct list_head entry; 177615c164dSAlexander Shishkin const struct msu_buffer *mbuf; 178615c164dSAlexander Shishkin struct module *owner; 179615c164dSAlexander Shishkin }; 180615c164dSAlexander Shishkin 181615c164dSAlexander Shishkin static struct msu_buffer_entry *__msu_buffer_entry_find(const char *name) 182615c164dSAlexander Shishkin { 183615c164dSAlexander Shishkin struct msu_buffer_entry *mbe; 184615c164dSAlexander Shishkin 185615c164dSAlexander Shishkin lockdep_assert_held(&msu_buffer_mutex); 186615c164dSAlexander Shishkin 187615c164dSAlexander Shishkin list_for_each_entry(mbe, &msu_buffer_list, entry) { 188615c164dSAlexander Shishkin if (!strcmp(mbe->mbuf->name, name)) 189615c164dSAlexander Shishkin return mbe; 190615c164dSAlexander Shishkin } 191615c164dSAlexander Shishkin 192615c164dSAlexander Shishkin return NULL; 193615c164dSAlexander Shishkin } 194615c164dSAlexander Shishkin 195615c164dSAlexander Shishkin static const struct msu_buffer * 196615c164dSAlexander Shishkin msu_buffer_get(const char *name) 197615c164dSAlexander Shishkin { 198615c164dSAlexander Shishkin struct msu_buffer_entry *mbe; 199615c164dSAlexander Shishkin 200615c164dSAlexander Shishkin mutex_lock(&msu_buffer_mutex); 201615c164dSAlexander Shishkin mbe = __msu_buffer_entry_find(name); 202615c164dSAlexander Shishkin if (mbe && !try_module_get(mbe->owner)) 203615c164dSAlexander Shishkin mbe = NULL; 204615c164dSAlexander Shishkin mutex_unlock(&msu_buffer_mutex); 205615c164dSAlexander Shishkin 206615c164dSAlexander Shishkin return mbe ? mbe->mbuf : NULL; 207615c164dSAlexander Shishkin } 208615c164dSAlexander Shishkin 209615c164dSAlexander Shishkin static void msu_buffer_put(const struct msu_buffer *mbuf) 210615c164dSAlexander Shishkin { 211615c164dSAlexander Shishkin struct msu_buffer_entry *mbe; 212615c164dSAlexander Shishkin 213615c164dSAlexander Shishkin mutex_lock(&msu_buffer_mutex); 214615c164dSAlexander Shishkin mbe = __msu_buffer_entry_find(mbuf->name); 215615c164dSAlexander Shishkin if (mbe) 216615c164dSAlexander Shishkin module_put(mbe->owner); 217615c164dSAlexander Shishkin mutex_unlock(&msu_buffer_mutex); 218615c164dSAlexander Shishkin } 219615c164dSAlexander Shishkin 220615c164dSAlexander Shishkin int intel_th_msu_buffer_register(const struct msu_buffer *mbuf, 221615c164dSAlexander Shishkin struct module *owner) 222615c164dSAlexander Shishkin { 223615c164dSAlexander Shishkin struct msu_buffer_entry *mbe; 224615c164dSAlexander Shishkin int ret = 0; 225615c164dSAlexander Shishkin 226615c164dSAlexander Shishkin mbe = kzalloc(sizeof(*mbe), GFP_KERNEL); 227615c164dSAlexander Shishkin if (!mbe) 228615c164dSAlexander Shishkin return -ENOMEM; 229615c164dSAlexander Shishkin 230615c164dSAlexander Shishkin mutex_lock(&msu_buffer_mutex); 231615c164dSAlexander Shishkin if (__msu_buffer_entry_find(mbuf->name)) { 232615c164dSAlexander Shishkin ret = -EEXIST; 233615c164dSAlexander Shishkin kfree(mbe); 234615c164dSAlexander Shishkin goto unlock; 235615c164dSAlexander Shishkin } 236615c164dSAlexander Shishkin 237615c164dSAlexander Shishkin mbe->mbuf = mbuf; 238615c164dSAlexander Shishkin mbe->owner = owner; 239615c164dSAlexander Shishkin list_add_tail(&mbe->entry, &msu_buffer_list); 240615c164dSAlexander Shishkin unlock: 241615c164dSAlexander Shishkin mutex_unlock(&msu_buffer_mutex); 242615c164dSAlexander Shishkin 243615c164dSAlexander Shishkin return ret; 244615c164dSAlexander Shishkin } 245615c164dSAlexander Shishkin EXPORT_SYMBOL_GPL(intel_th_msu_buffer_register); 246615c164dSAlexander Shishkin 247615c164dSAlexander Shishkin void intel_th_msu_buffer_unregister(const struct msu_buffer *mbuf) 248615c164dSAlexander Shishkin { 249615c164dSAlexander Shishkin struct msu_buffer_entry *mbe; 250615c164dSAlexander Shishkin 251615c164dSAlexander Shishkin mutex_lock(&msu_buffer_mutex); 252615c164dSAlexander Shishkin mbe = __msu_buffer_entry_find(mbuf->name); 253615c164dSAlexander Shishkin if (mbe) { 254615c164dSAlexander Shishkin list_del(&mbe->entry); 255615c164dSAlexander Shishkin kfree(mbe); 256615c164dSAlexander Shishkin } 257615c164dSAlexander Shishkin mutex_unlock(&msu_buffer_mutex); 258615c164dSAlexander Shishkin } 259615c164dSAlexander Shishkin EXPORT_SYMBOL_GPL(intel_th_msu_buffer_unregister); 260615c164dSAlexander Shishkin 261ba82664cSAlexander Shishkin static inline bool msc_block_is_empty(struct msc_block_desc *bdesc) 262ba82664cSAlexander Shishkin { 263ba82664cSAlexander Shishkin /* header hasn't been written */ 264ba82664cSAlexander Shishkin if (!bdesc->valid_dw) 265ba82664cSAlexander Shishkin return true; 266ba82664cSAlexander Shishkin 267ba82664cSAlexander Shishkin /* valid_dw includes the header */ 268ba82664cSAlexander Shishkin if (!msc_data_sz(bdesc)) 269ba82664cSAlexander Shishkin return true; 270ba82664cSAlexander Shishkin 271ba82664cSAlexander Shishkin return false; 272ba82664cSAlexander Shishkin } 273ba82664cSAlexander Shishkin 27457b69a1fSAlexander Shishkin static inline struct scatterlist *msc_win_base_sg(struct msc_window *win) 275ba39bd83SAlexander Shishkin { 27657b69a1fSAlexander Shishkin return win->sgt->sgl; 277ba39bd83SAlexander Shishkin } 278ba39bd83SAlexander Shishkin 27957b69a1fSAlexander Shishkin static inline struct msc_block_desc *msc_win_base(struct msc_window *win) 280fa52b3feSAlexander Shishkin { 28157b69a1fSAlexander Shishkin return sg_virt(msc_win_base_sg(win)); 282fa52b3feSAlexander Shishkin } 283fa52b3feSAlexander Shishkin 28457b69a1fSAlexander Shishkin static inline dma_addr_t msc_win_base_dma(struct msc_window *win) 285ba39bd83SAlexander Shishkin { 28657b69a1fSAlexander Shishkin return sg_dma_address(msc_win_base_sg(win)); 287ba39bd83SAlexander Shishkin } 288ba39bd83SAlexander Shishkin 289ba39bd83SAlexander Shishkin static inline unsigned long 29057b69a1fSAlexander Shishkin msc_win_base_pfn(struct msc_window *win) 291ba39bd83SAlexander Shishkin { 29257b69a1fSAlexander Shishkin return PFN_DOWN(msc_win_base_dma(win)); 293ba39bd83SAlexander Shishkin } 294ba39bd83SAlexander Shishkin 295ba82664cSAlexander Shishkin /** 296aad14ad3SAlexander Shishkin * msc_is_last_win() - check if a window is the last one for a given MSC 297aad14ad3SAlexander Shishkin * @win: window 298aad14ad3SAlexander Shishkin * Return: true if @win is the last window in MSC's multiblock buffer 299aad14ad3SAlexander Shishkin */ 300aad14ad3SAlexander Shishkin static inline bool msc_is_last_win(struct msc_window *win) 301aad14ad3SAlexander Shishkin { 302aad14ad3SAlexander Shishkin return win->entry.next == &win->msc->win_list; 303aad14ad3SAlexander Shishkin } 304aad14ad3SAlexander Shishkin 305aad14ad3SAlexander Shishkin /** 306aad14ad3SAlexander Shishkin * msc_next_window() - return next window in the multiblock buffer 307aad14ad3SAlexander Shishkin * @win: current window 308aad14ad3SAlexander Shishkin * 309aad14ad3SAlexander Shishkin * Return: window following the current one 310aad14ad3SAlexander Shishkin */ 311aad14ad3SAlexander Shishkin static struct msc_window *msc_next_window(struct msc_window *win) 312aad14ad3SAlexander Shishkin { 313aad14ad3SAlexander Shishkin if (msc_is_last_win(win)) 314aad14ad3SAlexander Shishkin return list_first_entry(&win->msc->win_list, struct msc_window, 315aad14ad3SAlexander Shishkin entry); 316aad14ad3SAlexander Shishkin 317aad14ad3SAlexander Shishkin return list_next_entry(win, entry); 318aad14ad3SAlexander Shishkin } 319aad14ad3SAlexander Shishkin 320615c164dSAlexander Shishkin static size_t msc_win_total_sz(struct msc_window *win) 321615c164dSAlexander Shishkin { 32257b69a1fSAlexander Shishkin struct scatterlist *sg; 323615c164dSAlexander Shishkin unsigned int blk; 324615c164dSAlexander Shishkin size_t size = 0; 325615c164dSAlexander Shishkin 32657b69a1fSAlexander Shishkin for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) { 32757b69a1fSAlexander Shishkin struct msc_block_desc *bdesc = sg_virt(sg); 328615c164dSAlexander Shishkin 329615c164dSAlexander Shishkin if (msc_block_wrapped(bdesc)) 330615c164dSAlexander Shishkin return win->nr_blocks << PAGE_SHIFT; 331615c164dSAlexander Shishkin 332615c164dSAlexander Shishkin size += msc_total_sz(bdesc); 333615c164dSAlexander Shishkin if (msc_block_last_written(bdesc)) 334615c164dSAlexander Shishkin break; 335615c164dSAlexander Shishkin } 336615c164dSAlexander Shishkin 337615c164dSAlexander Shishkin return size; 338615c164dSAlexander Shishkin } 339615c164dSAlexander Shishkin 340aad14ad3SAlexander Shishkin /** 341f505e91eSAlexander Shishkin * msc_find_window() - find a window matching a given sg_table 342ba82664cSAlexander Shishkin * @msc: MSC device 343f505e91eSAlexander Shishkin * @sgt: SG table of the window 344f505e91eSAlexander Shishkin * @nonempty: skip over empty windows 345ba82664cSAlexander Shishkin * 346f505e91eSAlexander Shishkin * Return: MSC window structure pointer or NULL if the window 347f505e91eSAlexander Shishkin * could not be found. 348ba82664cSAlexander Shishkin */ 349f505e91eSAlexander Shishkin static struct msc_window * 350f505e91eSAlexander Shishkin msc_find_window(struct msc *msc, struct sg_table *sgt, bool nonempty) 351ba82664cSAlexander Shishkin { 352f505e91eSAlexander Shishkin struct msc_window *win; 353ba82664cSAlexander Shishkin unsigned int found = 0; 354ba82664cSAlexander Shishkin 355ba82664cSAlexander Shishkin if (list_empty(&msc->win_list)) 356ba82664cSAlexander Shishkin return NULL; 357ba82664cSAlexander Shishkin 358ba82664cSAlexander Shishkin /* 359ba82664cSAlexander Shishkin * we might need a radix tree for this, depending on how 360ba82664cSAlexander Shishkin * many windows a typical user would allocate; ideally it's 361ba82664cSAlexander Shishkin * something like 2, in which case we're good 362ba82664cSAlexander Shishkin */ 363ba82664cSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) { 364f505e91eSAlexander Shishkin if (win->sgt == sgt) 365ba82664cSAlexander Shishkin found++; 366ba82664cSAlexander Shishkin 367ba82664cSAlexander Shishkin /* skip the empty ones */ 36857b69a1fSAlexander Shishkin if (nonempty && msc_block_is_empty(msc_win_base(win))) 369ba82664cSAlexander Shishkin continue; 370ba82664cSAlexander Shishkin 371ba82664cSAlexander Shishkin if (found) 372ba82664cSAlexander Shishkin return win; 373ba82664cSAlexander Shishkin } 374ba82664cSAlexander Shishkin 375f505e91eSAlexander Shishkin return NULL; 376f505e91eSAlexander Shishkin } 377f505e91eSAlexander Shishkin 378f505e91eSAlexander Shishkin /** 379f505e91eSAlexander Shishkin * msc_oldest_window() - locate the window with oldest data 380f505e91eSAlexander Shishkin * @msc: MSC device 381f505e91eSAlexander Shishkin * 382f505e91eSAlexander Shishkin * This should only be used in multiblock mode. Caller should hold the 383f505e91eSAlexander Shishkin * msc::user_count reference. 384f505e91eSAlexander Shishkin * 385f505e91eSAlexander Shishkin * Return: the oldest window with valid data 386f505e91eSAlexander Shishkin */ 387f505e91eSAlexander Shishkin static struct msc_window *msc_oldest_window(struct msc *msc) 388f505e91eSAlexander Shishkin { 389f505e91eSAlexander Shishkin struct msc_window *win; 390f505e91eSAlexander Shishkin 391f505e91eSAlexander Shishkin if (list_empty(&msc->win_list)) 392f505e91eSAlexander Shishkin return NULL; 393f505e91eSAlexander Shishkin 394f505e91eSAlexander Shishkin win = msc_find_window(msc, msc_next_window(msc->cur_win)->sgt, true); 395f505e91eSAlexander Shishkin if (win) 396f505e91eSAlexander Shishkin return win; 397f505e91eSAlexander Shishkin 3980de9e035SAlexander Shishkin return list_first_entry(&msc->win_list, struct msc_window, entry); 399ba82664cSAlexander Shishkin } 400ba82664cSAlexander Shishkin 401ba82664cSAlexander Shishkin /** 40257b69a1fSAlexander Shishkin * msc_win_oldest_sg() - locate the oldest block in a given window 403ba82664cSAlexander Shishkin * @win: window to look at 404ba82664cSAlexander Shishkin * 405ba82664cSAlexander Shishkin * Return: index of the block with the oldest data 406ba82664cSAlexander Shishkin */ 40757b69a1fSAlexander Shishkin static struct scatterlist *msc_win_oldest_sg(struct msc_window *win) 408ba82664cSAlexander Shishkin { 409ba82664cSAlexander Shishkin unsigned int blk; 41057b69a1fSAlexander Shishkin struct scatterlist *sg; 41157b69a1fSAlexander Shishkin struct msc_block_desc *bdesc = msc_win_base(win); 412ba82664cSAlexander Shishkin 413ba82664cSAlexander Shishkin /* without wrapping, first block is the oldest */ 414ba82664cSAlexander Shishkin if (!msc_block_wrapped(bdesc)) 41557b69a1fSAlexander Shishkin return msc_win_base_sg(win); 416ba82664cSAlexander Shishkin 417ba82664cSAlexander Shishkin /* 418ba82664cSAlexander Shishkin * with wrapping, last written block contains both the newest and the 419ba82664cSAlexander Shishkin * oldest data for this window. 420ba82664cSAlexander Shishkin */ 42157b69a1fSAlexander Shishkin for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) { 42257b69a1fSAlexander Shishkin struct msc_block_desc *bdesc = sg_virt(sg); 423ba82664cSAlexander Shishkin 424ba82664cSAlexander Shishkin if (msc_block_last_written(bdesc)) 42557b69a1fSAlexander Shishkin return sg; 426ba82664cSAlexander Shishkin } 427ba82664cSAlexander Shishkin 42857b69a1fSAlexander Shishkin return msc_win_base_sg(win); 429ba82664cSAlexander Shishkin } 430ba82664cSAlexander Shishkin 431ba82664cSAlexander Shishkin static struct msc_block_desc *msc_iter_bdesc(struct msc_iter *iter) 432ba82664cSAlexander Shishkin { 43357b69a1fSAlexander Shishkin return sg_virt(iter->block); 434ba82664cSAlexander Shishkin } 435ba82664cSAlexander Shishkin 436ba82664cSAlexander Shishkin static struct msc_iter *msc_iter_install(struct msc *msc) 437ba82664cSAlexander Shishkin { 438ba82664cSAlexander Shishkin struct msc_iter *iter; 439ba82664cSAlexander Shishkin 440ba82664cSAlexander Shishkin iter = kzalloc(sizeof(*iter), GFP_KERNEL); 441ba82664cSAlexander Shishkin if (!iter) 442a45ff6edSAlexander Shishkin return ERR_PTR(-ENOMEM); 443a45ff6edSAlexander Shishkin 444a45ff6edSAlexander Shishkin mutex_lock(&msc->buf_mutex); 445a45ff6edSAlexander Shishkin 446a45ff6edSAlexander Shishkin /* 447a45ff6edSAlexander Shishkin * Reading and tracing are mutually exclusive; if msc is 448a45ff6edSAlexander Shishkin * enabled, open() will fail; otherwise existing readers 449a45ff6edSAlexander Shishkin * will prevent enabling the msc and the rest of fops don't 450a45ff6edSAlexander Shishkin * need to worry about it. 451a45ff6edSAlexander Shishkin */ 452a45ff6edSAlexander Shishkin if (msc->enabled) { 453a45ff6edSAlexander Shishkin kfree(iter); 454a45ff6edSAlexander Shishkin iter = ERR_PTR(-EBUSY); 455a45ff6edSAlexander Shishkin goto unlock; 456a45ff6edSAlexander Shishkin } 457ba82664cSAlexander Shishkin 458ba82664cSAlexander Shishkin iter->msc = msc; 459ba82664cSAlexander Shishkin 460ba82664cSAlexander Shishkin list_add_tail(&iter->entry, &msc->iter_list); 461a45ff6edSAlexander Shishkin unlock: 462a45ff6edSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 463ba82664cSAlexander Shishkin 464ba82664cSAlexander Shishkin return iter; 465ba82664cSAlexander Shishkin } 466ba82664cSAlexander Shishkin 467ba82664cSAlexander Shishkin static void msc_iter_remove(struct msc_iter *iter, struct msc *msc) 468ba82664cSAlexander Shishkin { 469a45ff6edSAlexander Shishkin mutex_lock(&msc->buf_mutex); 470ba82664cSAlexander Shishkin list_del(&iter->entry); 471a45ff6edSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 472ba82664cSAlexander Shishkin 473ba82664cSAlexander Shishkin kfree(iter); 474ba82664cSAlexander Shishkin } 475ba82664cSAlexander Shishkin 476ba82664cSAlexander Shishkin static void msc_iter_block_start(struct msc_iter *iter) 477ba82664cSAlexander Shishkin { 47857b69a1fSAlexander Shishkin if (iter->start_block) 479ba82664cSAlexander Shishkin return; 480ba82664cSAlexander Shishkin 48157b69a1fSAlexander Shishkin iter->start_block = msc_win_oldest_sg(iter->win); 482ba82664cSAlexander Shishkin iter->block = iter->start_block; 483ba82664cSAlexander Shishkin iter->wrap_count = 0; 484ba82664cSAlexander Shishkin 485ba82664cSAlexander Shishkin /* 486ba82664cSAlexander Shishkin * start with the block with oldest data; if data has wrapped 487ba82664cSAlexander Shishkin * in this window, it should be in this block 488ba82664cSAlexander Shishkin */ 489ba82664cSAlexander Shishkin if (msc_block_wrapped(msc_iter_bdesc(iter))) 490ba82664cSAlexander Shishkin iter->wrap_count = 2; 491ba82664cSAlexander Shishkin 492ba82664cSAlexander Shishkin } 493ba82664cSAlexander Shishkin 494ba82664cSAlexander Shishkin static int msc_iter_win_start(struct msc_iter *iter, struct msc *msc) 495ba82664cSAlexander Shishkin { 496ba82664cSAlexander Shishkin /* already started, nothing to do */ 497ba82664cSAlexander Shishkin if (iter->start_win) 498ba82664cSAlexander Shishkin return 0; 499ba82664cSAlexander Shishkin 500ba82664cSAlexander Shishkin iter->start_win = msc_oldest_window(msc); 501ba82664cSAlexander Shishkin if (!iter->start_win) 502ba82664cSAlexander Shishkin return -EINVAL; 503ba82664cSAlexander Shishkin 504ba82664cSAlexander Shishkin iter->win = iter->start_win; 50557b69a1fSAlexander Shishkin iter->start_block = NULL; 506ba82664cSAlexander Shishkin 507ba82664cSAlexander Shishkin msc_iter_block_start(iter); 508ba82664cSAlexander Shishkin 509ba82664cSAlexander Shishkin return 0; 510ba82664cSAlexander Shishkin } 511ba82664cSAlexander Shishkin 512ba82664cSAlexander Shishkin static int msc_iter_win_advance(struct msc_iter *iter) 513ba82664cSAlexander Shishkin { 514ba82664cSAlexander Shishkin iter->win = msc_next_window(iter->win); 51557b69a1fSAlexander Shishkin iter->start_block = NULL; 516ba82664cSAlexander Shishkin 517ba82664cSAlexander Shishkin if (iter->win == iter->start_win) { 518ba82664cSAlexander Shishkin iter->eof++; 519ba82664cSAlexander Shishkin return 1; 520ba82664cSAlexander Shishkin } 521ba82664cSAlexander Shishkin 522ba82664cSAlexander Shishkin msc_iter_block_start(iter); 523ba82664cSAlexander Shishkin 524ba82664cSAlexander Shishkin return 0; 525ba82664cSAlexander Shishkin } 526ba82664cSAlexander Shishkin 527ba82664cSAlexander Shishkin static int msc_iter_block_advance(struct msc_iter *iter) 528ba82664cSAlexander Shishkin { 529ba82664cSAlexander Shishkin iter->block_off = 0; 530ba82664cSAlexander Shishkin 531ba82664cSAlexander Shishkin /* wrapping */ 532ba82664cSAlexander Shishkin if (iter->wrap_count && iter->block == iter->start_block) { 533ba82664cSAlexander Shishkin iter->wrap_count--; 534ba82664cSAlexander Shishkin if (!iter->wrap_count) 535ba82664cSAlexander Shishkin /* copied newest data from the wrapped block */ 536ba82664cSAlexander Shishkin return msc_iter_win_advance(iter); 537ba82664cSAlexander Shishkin } 538ba82664cSAlexander Shishkin 539ba82664cSAlexander Shishkin /* no wrapping, check for last written block */ 540ba82664cSAlexander Shishkin if (!iter->wrap_count && msc_block_last_written(msc_iter_bdesc(iter))) 541ba82664cSAlexander Shishkin /* copied newest data for the window */ 542ba82664cSAlexander Shishkin return msc_iter_win_advance(iter); 543ba82664cSAlexander Shishkin 544ba82664cSAlexander Shishkin /* block advance */ 54557b69a1fSAlexander Shishkin if (sg_is_last(iter->block)) 54657b69a1fSAlexander Shishkin iter->block = msc_win_base_sg(iter->win); 54757b69a1fSAlexander Shishkin else 54857b69a1fSAlexander Shishkin iter->block = sg_next(iter->block); 549ba82664cSAlexander Shishkin 550ba82664cSAlexander Shishkin /* no wrapping, sanity check in case there is no last written block */ 551ba82664cSAlexander Shishkin if (!iter->wrap_count && iter->block == iter->start_block) 552ba82664cSAlexander Shishkin return msc_iter_win_advance(iter); 553ba82664cSAlexander Shishkin 554ba82664cSAlexander Shishkin return 0; 555ba82664cSAlexander Shishkin } 556ba82664cSAlexander Shishkin 557ba82664cSAlexander Shishkin /** 558ba82664cSAlexander Shishkin * msc_buffer_iterate() - go through multiblock buffer's data 559ba82664cSAlexander Shishkin * @iter: iterator structure 560ba82664cSAlexander Shishkin * @size: amount of data to scan 561ba82664cSAlexander Shishkin * @data: callback's private data 562ba82664cSAlexander Shishkin * @fn: iterator callback 563ba82664cSAlexander Shishkin * 564ba82664cSAlexander Shishkin * This will start at the window which will be written to next (containing 565ba82664cSAlexander Shishkin * the oldest data) and work its way to the current window, calling @fn 566ba82664cSAlexander Shishkin * for each chunk of data as it goes. 567ba82664cSAlexander Shishkin * 568ba82664cSAlexander Shishkin * Caller should have msc::user_count reference to make sure the buffer 569ba82664cSAlexander Shishkin * doesn't disappear from under us. 570ba82664cSAlexander Shishkin * 571ba82664cSAlexander Shishkin * Return: amount of data actually scanned. 572ba82664cSAlexander Shishkin */ 573ba82664cSAlexander Shishkin static ssize_t 574ba82664cSAlexander Shishkin msc_buffer_iterate(struct msc_iter *iter, size_t size, void *data, 575ba82664cSAlexander Shishkin unsigned long (*fn)(void *, void *, size_t)) 576ba82664cSAlexander Shishkin { 577ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 578ba82664cSAlexander Shishkin size_t len = size; 579ba82664cSAlexander Shishkin unsigned int advance; 580ba82664cSAlexander Shishkin 581ba82664cSAlexander Shishkin if (iter->eof) 582ba82664cSAlexander Shishkin return 0; 583ba82664cSAlexander Shishkin 584ba82664cSAlexander Shishkin /* start with the oldest window */ 585ba82664cSAlexander Shishkin if (msc_iter_win_start(iter, msc)) 586ba82664cSAlexander Shishkin return 0; 587ba82664cSAlexander Shishkin 588ba82664cSAlexander Shishkin do { 589ba82664cSAlexander Shishkin unsigned long data_bytes = msc_data_sz(msc_iter_bdesc(iter)); 590ba82664cSAlexander Shishkin void *src = (void *)msc_iter_bdesc(iter) + MSC_BDESC; 591ba82664cSAlexander Shishkin size_t tocopy = data_bytes, copied = 0; 592ba82664cSAlexander Shishkin size_t remaining = 0; 593ba82664cSAlexander Shishkin 594ba82664cSAlexander Shishkin advance = 1; 595ba82664cSAlexander Shishkin 596ba82664cSAlexander Shishkin /* 597ba82664cSAlexander Shishkin * If block wrapping happened, we need to visit the last block 598ba82664cSAlexander Shishkin * twice, because it contains both the oldest and the newest 599ba82664cSAlexander Shishkin * data in this window. 600ba82664cSAlexander Shishkin * 601ba82664cSAlexander Shishkin * First time (wrap_count==2), in the very beginning, to collect 602ba82664cSAlexander Shishkin * the oldest data, which is in the range 603ba82664cSAlexander Shishkin * (data_bytes..DATA_IN_PAGE). 604ba82664cSAlexander Shishkin * 605ba82664cSAlexander Shishkin * Second time (wrap_count==1), it's just like any other block, 606ba82664cSAlexander Shishkin * containing data in the range of [MSC_BDESC..data_bytes]. 607ba82664cSAlexander Shishkin */ 608e4eca2a1SLaurent FERT if (iter->block == iter->start_block && iter->wrap_count == 2) { 609ba82664cSAlexander Shishkin tocopy = DATA_IN_PAGE - data_bytes; 610ba82664cSAlexander Shishkin src += data_bytes; 611ba82664cSAlexander Shishkin } 612ba82664cSAlexander Shishkin 613ba82664cSAlexander Shishkin if (!tocopy) 614ba82664cSAlexander Shishkin goto next_block; 615ba82664cSAlexander Shishkin 616ba82664cSAlexander Shishkin tocopy -= iter->block_off; 617ba82664cSAlexander Shishkin src += iter->block_off; 618ba82664cSAlexander Shishkin 619ba82664cSAlexander Shishkin if (len < tocopy) { 620ba82664cSAlexander Shishkin tocopy = len; 621ba82664cSAlexander Shishkin advance = 0; 622ba82664cSAlexander Shishkin } 623ba82664cSAlexander Shishkin 624ba82664cSAlexander Shishkin remaining = fn(data, src, tocopy); 625ba82664cSAlexander Shishkin 626ba82664cSAlexander Shishkin if (remaining) 627ba82664cSAlexander Shishkin advance = 0; 628ba82664cSAlexander Shishkin 629ba82664cSAlexander Shishkin copied = tocopy - remaining; 630ba82664cSAlexander Shishkin len -= copied; 631ba82664cSAlexander Shishkin iter->block_off += copied; 632ba82664cSAlexander Shishkin iter->offset += copied; 633ba82664cSAlexander Shishkin 634ba82664cSAlexander Shishkin if (!advance) 635ba82664cSAlexander Shishkin break; 636ba82664cSAlexander Shishkin 637ba82664cSAlexander Shishkin next_block: 638ba82664cSAlexander Shishkin if (msc_iter_block_advance(iter)) 639ba82664cSAlexander Shishkin break; 640ba82664cSAlexander Shishkin 641ba82664cSAlexander Shishkin } while (len); 642ba82664cSAlexander Shishkin 643ba82664cSAlexander Shishkin return size - len; 644ba82664cSAlexander Shishkin } 645ba82664cSAlexander Shishkin 646ba82664cSAlexander Shishkin /** 647ba82664cSAlexander Shishkin * msc_buffer_clear_hw_header() - clear hw header for multiblock 648ba82664cSAlexander Shishkin * @msc: MSC device 649ba82664cSAlexander Shishkin */ 650ba82664cSAlexander Shishkin static void msc_buffer_clear_hw_header(struct msc *msc) 651ba82664cSAlexander Shishkin { 652ba82664cSAlexander Shishkin struct msc_window *win; 65357b69a1fSAlexander Shishkin struct scatterlist *sg; 654ba82664cSAlexander Shishkin 655ba82664cSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) { 656ba82664cSAlexander Shishkin unsigned int blk; 657ba82664cSAlexander Shishkin size_t hw_sz = sizeof(struct msc_block_desc) - 658ba82664cSAlexander Shishkin offsetof(struct msc_block_desc, hw_tag); 659ba82664cSAlexander Shishkin 66057b69a1fSAlexander Shishkin for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) { 66157b69a1fSAlexander Shishkin struct msc_block_desc *bdesc = sg_virt(sg); 662ba82664cSAlexander Shishkin 663ba82664cSAlexander Shishkin memset(&bdesc->hw_tag, 0, hw_sz); 664ba82664cSAlexander Shishkin } 665ba82664cSAlexander Shishkin } 666ba82664cSAlexander Shishkin } 667ba82664cSAlexander Shishkin 668aac8da65SAlexander Shishkin static int intel_th_msu_init(struct msc *msc) 669aac8da65SAlexander Shishkin { 670aac8da65SAlexander Shishkin u32 mintctl, msusts; 671aac8da65SAlexander Shishkin 672aac8da65SAlexander Shishkin if (!msc->do_irq) 673aac8da65SAlexander Shishkin return 0; 674aac8da65SAlexander Shishkin 675615c164dSAlexander Shishkin if (!msc->mbuf) 676615c164dSAlexander Shishkin return 0; 677615c164dSAlexander Shishkin 678aac8da65SAlexander Shishkin mintctl = ioread32(msc->msu_base + REG_MSU_MINTCTL); 679aac8da65SAlexander Shishkin mintctl |= msc->index ? M1BLIE : M0BLIE; 680aac8da65SAlexander Shishkin iowrite32(mintctl, msc->msu_base + REG_MSU_MINTCTL); 681aac8da65SAlexander Shishkin if (mintctl != ioread32(msc->msu_base + REG_MSU_MINTCTL)) { 682aac8da65SAlexander Shishkin dev_info(msc_dev(msc), "MINTCTL ignores writes: no usable interrupts\n"); 683aac8da65SAlexander Shishkin msc->do_irq = 0; 684aac8da65SAlexander Shishkin return 0; 685aac8da65SAlexander Shishkin } 686aac8da65SAlexander Shishkin 687aac8da65SAlexander Shishkin msusts = ioread32(msc->msu_base + REG_MSU_MSUSTS); 688aac8da65SAlexander Shishkin iowrite32(msusts, msc->msu_base + REG_MSU_MSUSTS); 689aac8da65SAlexander Shishkin 690aac8da65SAlexander Shishkin return 0; 691aac8da65SAlexander Shishkin } 692aac8da65SAlexander Shishkin 693aac8da65SAlexander Shishkin static void intel_th_msu_deinit(struct msc *msc) 694aac8da65SAlexander Shishkin { 695aac8da65SAlexander Shishkin u32 mintctl; 696aac8da65SAlexander Shishkin 697aac8da65SAlexander Shishkin if (!msc->do_irq) 698aac8da65SAlexander Shishkin return; 699aac8da65SAlexander Shishkin 700aac8da65SAlexander Shishkin mintctl = ioread32(msc->msu_base + REG_MSU_MINTCTL); 701aac8da65SAlexander Shishkin mintctl &= msc->index ? ~M1BLIE : ~M0BLIE; 702aac8da65SAlexander Shishkin iowrite32(mintctl, msc->msu_base + REG_MSU_MINTCTL); 703aac8da65SAlexander Shishkin } 704aac8da65SAlexander Shishkin 705615c164dSAlexander Shishkin static int msc_win_set_lockout(struct msc_window *win, 706615c164dSAlexander Shishkin enum lockout_state expect, 707615c164dSAlexander Shishkin enum lockout_state new) 708615c164dSAlexander Shishkin { 709615c164dSAlexander Shishkin enum lockout_state old; 710615c164dSAlexander Shishkin unsigned long flags; 711615c164dSAlexander Shishkin int ret = 0; 712615c164dSAlexander Shishkin 713615c164dSAlexander Shishkin if (!win->msc->mbuf) 714615c164dSAlexander Shishkin return 0; 715615c164dSAlexander Shishkin 716615c164dSAlexander Shishkin spin_lock_irqsave(&win->lo_lock, flags); 717615c164dSAlexander Shishkin old = win->lockout; 718615c164dSAlexander Shishkin 719615c164dSAlexander Shishkin if (old != expect) { 720615c164dSAlexander Shishkin ret = -EINVAL; 721615c164dSAlexander Shishkin dev_warn_ratelimited(msc_dev(win->msc), 722615c164dSAlexander Shishkin "expected lockout state %d, got %d\n", 723615c164dSAlexander Shishkin expect, old); 724615c164dSAlexander Shishkin goto unlock; 725615c164dSAlexander Shishkin } 726615c164dSAlexander Shishkin 727615c164dSAlexander Shishkin win->lockout = new; 728615c164dSAlexander Shishkin 729ed5207afSAlexander Shishkin if (old == expect && new == WIN_LOCKED) 730ed5207afSAlexander Shishkin atomic_inc(&win->msc->user_count); 731ed5207afSAlexander Shishkin else if (old == expect && old == WIN_LOCKED) 732ed5207afSAlexander Shishkin atomic_dec(&win->msc->user_count); 733ed5207afSAlexander Shishkin 734615c164dSAlexander Shishkin unlock: 735615c164dSAlexander Shishkin spin_unlock_irqrestore(&win->lo_lock, flags); 736615c164dSAlexander Shishkin 737615c164dSAlexander Shishkin if (ret) { 738615c164dSAlexander Shishkin if (expect == WIN_READY && old == WIN_LOCKED) 739615c164dSAlexander Shishkin return -EBUSY; 740615c164dSAlexander Shishkin 741615c164dSAlexander Shishkin /* from intel_th_msc_window_unlock(), don't warn if not locked */ 742615c164dSAlexander Shishkin if (expect == WIN_LOCKED && old == new) 743615c164dSAlexander Shishkin return 0; 744615c164dSAlexander Shishkin } 745615c164dSAlexander Shishkin 746615c164dSAlexander Shishkin return ret; 747615c164dSAlexander Shishkin } 748ba82664cSAlexander Shishkin /** 749ba82664cSAlexander Shishkin * msc_configure() - set up MSC hardware 750ba82664cSAlexander Shishkin * @msc: the MSC device to configure 751ba82664cSAlexander Shishkin * 752ba82664cSAlexander Shishkin * Program storage mode, wrapping, burst length and trace buffer address 753a45ff6edSAlexander Shishkin * into a given MSC. Then, enable tracing and set msc::enabled. 754a45ff6edSAlexander Shishkin * The latter is serialized on msc::buf_mutex, so make sure to hold it. 755ba82664cSAlexander Shishkin */ 756ba82664cSAlexander Shishkin static int msc_configure(struct msc *msc) 757ba82664cSAlexander Shishkin { 758ba82664cSAlexander Shishkin u32 reg; 759ba82664cSAlexander Shishkin 760a45ff6edSAlexander Shishkin lockdep_assert_held(&msc->buf_mutex); 761a45ff6edSAlexander Shishkin 762ba82664cSAlexander Shishkin if (msc->mode > MSC_MODE_MULTI) 763ba82664cSAlexander Shishkin return -ENOTSUPP; 764ba82664cSAlexander Shishkin 765615c164dSAlexander Shishkin if (msc->mode == MSC_MODE_MULTI) { 766615c164dSAlexander Shishkin if (msc_win_set_lockout(msc->cur_win, WIN_READY, WIN_INUSE)) 767615c164dSAlexander Shishkin return -EBUSY; 768615c164dSAlexander Shishkin 769ba82664cSAlexander Shishkin msc_buffer_clear_hw_header(msc); 770615c164dSAlexander Shishkin } 771ba82664cSAlexander Shishkin 772092f47c3SAlexander Shishkin msc->orig_addr = ioread32(msc->reg_base + REG_MSU_MSC0BAR); 773092f47c3SAlexander Shishkin msc->orig_sz = ioread32(msc->reg_base + REG_MSU_MSC0SIZE); 774092f47c3SAlexander Shishkin 775ba82664cSAlexander Shishkin reg = msc->base_addr >> PAGE_SHIFT; 776ba82664cSAlexander Shishkin iowrite32(reg, msc->reg_base + REG_MSU_MSC0BAR); 777ba82664cSAlexander Shishkin 778ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) { 779ba82664cSAlexander Shishkin reg = msc->nr_pages; 780ba82664cSAlexander Shishkin iowrite32(reg, msc->reg_base + REG_MSU_MSC0SIZE); 781ba82664cSAlexander Shishkin } 782ba82664cSAlexander Shishkin 783ba82664cSAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSC0CTL); 784ba82664cSAlexander Shishkin reg &= ~(MSC_MODE | MSC_WRAPEN | MSC_EN | MSC_RD_HDR_OVRD); 785ba82664cSAlexander Shishkin 786a45ff6edSAlexander Shishkin reg |= MSC_EN; 787ba82664cSAlexander Shishkin reg |= msc->mode << __ffs(MSC_MODE); 788ba82664cSAlexander Shishkin reg |= msc->burst_len << __ffs(MSC_LEN); 789a45ff6edSAlexander Shishkin 790ba82664cSAlexander Shishkin if (msc->wrap) 791ba82664cSAlexander Shishkin reg |= MSC_WRAPEN; 792ba82664cSAlexander Shishkin 793ba82664cSAlexander Shishkin iowrite32(reg, msc->reg_base + REG_MSU_MSC0CTL); 794ba82664cSAlexander Shishkin 795615c164dSAlexander Shishkin intel_th_msu_init(msc); 796615c164dSAlexander Shishkin 797ba82664cSAlexander Shishkin msc->thdev->output.multiblock = msc->mode == MSC_MODE_MULTI; 798ba82664cSAlexander Shishkin intel_th_trace_enable(msc->thdev); 799a45ff6edSAlexander Shishkin msc->enabled = 1; 800a45ff6edSAlexander Shishkin 801615c164dSAlexander Shishkin if (msc->mbuf && msc->mbuf->activate) 802615c164dSAlexander Shishkin msc->mbuf->activate(msc->mbuf_priv); 803ba82664cSAlexander Shishkin 804ba82664cSAlexander Shishkin return 0; 805ba82664cSAlexander Shishkin } 806ba82664cSAlexander Shishkin 807ba82664cSAlexander Shishkin /** 808ba82664cSAlexander Shishkin * msc_disable() - disable MSC hardware 809ba82664cSAlexander Shishkin * @msc: MSC device to disable 810ba82664cSAlexander Shishkin * 811ba82664cSAlexander Shishkin * If @msc is enabled, disable tracing on the switch and then disable MSC 812a45ff6edSAlexander Shishkin * storage. Caller must hold msc::buf_mutex. 813ba82664cSAlexander Shishkin */ 814ba82664cSAlexander Shishkin static void msc_disable(struct msc *msc) 815ba82664cSAlexander Shishkin { 816615c164dSAlexander Shishkin struct msc_window *win = msc->cur_win; 817ba82664cSAlexander Shishkin u32 reg; 818ba82664cSAlexander Shishkin 819a45ff6edSAlexander Shishkin lockdep_assert_held(&msc->buf_mutex); 820ba82664cSAlexander Shishkin 821615c164dSAlexander Shishkin if (msc->mode == MSC_MODE_MULTI) 822615c164dSAlexander Shishkin msc_win_set_lockout(win, WIN_INUSE, WIN_LOCKED); 823615c164dSAlexander Shishkin 824615c164dSAlexander Shishkin if (msc->mbuf && msc->mbuf->deactivate) 825615c164dSAlexander Shishkin msc->mbuf->deactivate(msc->mbuf_priv); 826615c164dSAlexander Shishkin intel_th_msu_deinit(msc); 827ba82664cSAlexander Shishkin intel_th_trace_disable(msc->thdev); 828ba82664cSAlexander Shishkin 829ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) { 8308d415512SAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSC0STS); 831ba82664cSAlexander Shishkin msc->single_wrap = !!(reg & MSCSTS_WRAPSTAT); 832ba82664cSAlexander Shishkin 833ba82664cSAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSC0MWP); 834ba82664cSAlexander Shishkin msc->single_sz = reg & ((msc->nr_pages << PAGE_SHIFT) - 1); 835ba82664cSAlexander Shishkin dev_dbg(msc_dev(msc), "MSCnMWP: %08x/%08lx, wrap: %d\n", 836ba82664cSAlexander Shishkin reg, msc->single_sz, msc->single_wrap); 837ba82664cSAlexander Shishkin } 838ba82664cSAlexander Shishkin 839ba82664cSAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSC0CTL); 840ba82664cSAlexander Shishkin reg &= ~MSC_EN; 841ba82664cSAlexander Shishkin iowrite32(reg, msc->reg_base + REG_MSU_MSC0CTL); 842615c164dSAlexander Shishkin 843615c164dSAlexander Shishkin if (msc->mbuf && msc->mbuf->ready) 844615c164dSAlexander Shishkin msc->mbuf->ready(msc->mbuf_priv, win->sgt, 845615c164dSAlexander Shishkin msc_win_total_sz(win)); 846615c164dSAlexander Shishkin 847ba82664cSAlexander Shishkin msc->enabled = 0; 848ba82664cSAlexander Shishkin 849092f47c3SAlexander Shishkin iowrite32(msc->orig_addr, msc->reg_base + REG_MSU_MSC0BAR); 850092f47c3SAlexander Shishkin iowrite32(msc->orig_sz, msc->reg_base + REG_MSU_MSC0SIZE); 851ba82664cSAlexander Shishkin 852ba82664cSAlexander Shishkin dev_dbg(msc_dev(msc), "MSCnNWSA: %08x\n", 853ba82664cSAlexander Shishkin ioread32(msc->reg_base + REG_MSU_MSC0NWSA)); 854ba82664cSAlexander Shishkin 855ba82664cSAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSC0STS); 856ba82664cSAlexander Shishkin dev_dbg(msc_dev(msc), "MSCnSTS: %08x\n", reg); 857615c164dSAlexander Shishkin 858615c164dSAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSUSTS); 859615c164dSAlexander Shishkin reg &= msc->index ? MSUSTS_MSC1BLAST : MSUSTS_MSC0BLAST; 860615c164dSAlexander Shishkin iowrite32(reg, msc->reg_base + REG_MSU_MSUSTS); 861ba82664cSAlexander Shishkin } 862ba82664cSAlexander Shishkin 863ba82664cSAlexander Shishkin static int intel_th_msc_activate(struct intel_th_device *thdev) 864ba82664cSAlexander Shishkin { 865ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 866a45ff6edSAlexander Shishkin int ret = -EBUSY; 867ba82664cSAlexander Shishkin 868ba82664cSAlexander Shishkin if (!atomic_inc_unless_negative(&msc->user_count)) 869ba82664cSAlexander Shishkin return -ENODEV; 870ba82664cSAlexander Shishkin 871a45ff6edSAlexander Shishkin mutex_lock(&msc->buf_mutex); 872ba82664cSAlexander Shishkin 873a45ff6edSAlexander Shishkin /* if there are readers, refuse */ 874a45ff6edSAlexander Shishkin if (list_empty(&msc->iter_list)) 875a45ff6edSAlexander Shishkin ret = msc_configure(msc); 876a45ff6edSAlexander Shishkin 877a45ff6edSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 878a45ff6edSAlexander Shishkin 879a45ff6edSAlexander Shishkin if (ret) 880ba82664cSAlexander Shishkin atomic_dec(&msc->user_count); 881a45ff6edSAlexander Shishkin 882ba82664cSAlexander Shishkin return ret; 883ba82664cSAlexander Shishkin } 884ba82664cSAlexander Shishkin 885ba82664cSAlexander Shishkin static void intel_th_msc_deactivate(struct intel_th_device *thdev) 886ba82664cSAlexander Shishkin { 887ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 888ba82664cSAlexander Shishkin 889a45ff6edSAlexander Shishkin mutex_lock(&msc->buf_mutex); 890a45ff6edSAlexander Shishkin if (msc->enabled) { 891ba82664cSAlexander Shishkin msc_disable(msc); 892ba82664cSAlexander Shishkin atomic_dec(&msc->user_count); 893ba82664cSAlexander Shishkin } 894a45ff6edSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 895a45ff6edSAlexander Shishkin } 896ba82664cSAlexander Shishkin 897ba82664cSAlexander Shishkin /** 898ba82664cSAlexander Shishkin * msc_buffer_contig_alloc() - allocate a contiguous buffer for SINGLE mode 899ba82664cSAlexander Shishkin * @msc: MSC device 900ba82664cSAlexander Shishkin * @size: allocation size in bytes 901ba82664cSAlexander Shishkin * 902ba82664cSAlexander Shishkin * This modifies msc::base, which requires msc::buf_mutex to serialize, so the 903ba82664cSAlexander Shishkin * caller is expected to hold it. 904ba82664cSAlexander Shishkin * 905ba82664cSAlexander Shishkin * Return: 0 on success, -errno otherwise. 906ba82664cSAlexander Shishkin */ 907ba82664cSAlexander Shishkin static int msc_buffer_contig_alloc(struct msc *msc, unsigned long size) 908ba82664cSAlexander Shishkin { 9094e0eaf23SAlexander Shishkin unsigned long nr_pages = size >> PAGE_SHIFT; 910ba82664cSAlexander Shishkin unsigned int order = get_order(size); 911ba82664cSAlexander Shishkin struct page *page; 9124e0eaf23SAlexander Shishkin int ret; 913ba82664cSAlexander Shishkin 914ba82664cSAlexander Shishkin if (!size) 915ba82664cSAlexander Shishkin return 0; 916ba82664cSAlexander Shishkin 9174e0eaf23SAlexander Shishkin ret = sg_alloc_table(&msc->single_sgt, 1, GFP_KERNEL); 9184e0eaf23SAlexander Shishkin if (ret) 9194e0eaf23SAlexander Shishkin goto err_out; 9204e0eaf23SAlexander Shishkin 9214e0eaf23SAlexander Shishkin ret = -ENOMEM; 922918b8646SAlexander Shishkin page = alloc_pages(GFP_KERNEL | __GFP_ZERO | GFP_DMA32, order); 923ba82664cSAlexander Shishkin if (!page) 9244e0eaf23SAlexander Shishkin goto err_free_sgt; 925ba82664cSAlexander Shishkin 926ba82664cSAlexander Shishkin split_page(page, order); 9274e0eaf23SAlexander Shishkin sg_set_buf(msc->single_sgt.sgl, page_address(page), size); 9284e0eaf23SAlexander Shishkin 9294e0eaf23SAlexander Shishkin ret = dma_map_sg(msc_dev(msc)->parent->parent, msc->single_sgt.sgl, 1, 9304e0eaf23SAlexander Shishkin DMA_FROM_DEVICE); 9314e0eaf23SAlexander Shishkin if (ret < 0) 9324e0eaf23SAlexander Shishkin goto err_free_pages; 9334e0eaf23SAlexander Shishkin 9344e0eaf23SAlexander Shishkin msc->nr_pages = nr_pages; 935ba82664cSAlexander Shishkin msc->base = page_address(page); 9364e0eaf23SAlexander Shishkin msc->base_addr = sg_dma_address(msc->single_sgt.sgl); 937ba82664cSAlexander Shishkin 938ba82664cSAlexander Shishkin return 0; 9394e0eaf23SAlexander Shishkin 9404e0eaf23SAlexander Shishkin err_free_pages: 9414e0eaf23SAlexander Shishkin __free_pages(page, order); 9424e0eaf23SAlexander Shishkin 9434e0eaf23SAlexander Shishkin err_free_sgt: 9444e0eaf23SAlexander Shishkin sg_free_table(&msc->single_sgt); 9454e0eaf23SAlexander Shishkin 9464e0eaf23SAlexander Shishkin err_out: 9474e0eaf23SAlexander Shishkin return ret; 948ba82664cSAlexander Shishkin } 949ba82664cSAlexander Shishkin 950ba82664cSAlexander Shishkin /** 951ba82664cSAlexander Shishkin * msc_buffer_contig_free() - free a contiguous buffer 952ba82664cSAlexander Shishkin * @msc: MSC configured in SINGLE mode 953ba82664cSAlexander Shishkin */ 954ba82664cSAlexander Shishkin static void msc_buffer_contig_free(struct msc *msc) 955ba82664cSAlexander Shishkin { 956ba82664cSAlexander Shishkin unsigned long off; 957ba82664cSAlexander Shishkin 9584e0eaf23SAlexander Shishkin dma_unmap_sg(msc_dev(msc)->parent->parent, msc->single_sgt.sgl, 9594e0eaf23SAlexander Shishkin 1, DMA_FROM_DEVICE); 9604e0eaf23SAlexander Shishkin sg_free_table(&msc->single_sgt); 9614e0eaf23SAlexander Shishkin 962ba82664cSAlexander Shishkin for (off = 0; off < msc->nr_pages << PAGE_SHIFT; off += PAGE_SIZE) { 963ba82664cSAlexander Shishkin struct page *page = virt_to_page(msc->base + off); 964ba82664cSAlexander Shishkin 965ba82664cSAlexander Shishkin page->mapping = NULL; 966ba82664cSAlexander Shishkin __free_page(page); 967ba82664cSAlexander Shishkin } 968ba82664cSAlexander Shishkin 969ba82664cSAlexander Shishkin msc->nr_pages = 0; 970ba82664cSAlexander Shishkin } 971ba82664cSAlexander Shishkin 972ba82664cSAlexander Shishkin /** 973ba82664cSAlexander Shishkin * msc_buffer_contig_get_page() - find a page at a given offset 974ba82664cSAlexander Shishkin * @msc: MSC configured in SINGLE mode 975ba82664cSAlexander Shishkin * @pgoff: page offset 976ba82664cSAlexander Shishkin * 977ba82664cSAlexander Shishkin * Return: page, if @pgoff is within the range, NULL otherwise. 978ba82664cSAlexander Shishkin */ 979ba82664cSAlexander Shishkin static struct page *msc_buffer_contig_get_page(struct msc *msc, 980ba82664cSAlexander Shishkin unsigned long pgoff) 981ba82664cSAlexander Shishkin { 982ba82664cSAlexander Shishkin if (pgoff >= msc->nr_pages) 983ba82664cSAlexander Shishkin return NULL; 984ba82664cSAlexander Shishkin 985ba82664cSAlexander Shishkin return virt_to_page(msc->base + (pgoff << PAGE_SHIFT)); 986ba82664cSAlexander Shishkin } 987ba82664cSAlexander Shishkin 988ba39bd83SAlexander Shishkin static int __msc_buffer_win_alloc(struct msc_window *win, 989fa52b3feSAlexander Shishkin unsigned int nr_segs) 990ba39bd83SAlexander Shishkin { 991ba39bd83SAlexander Shishkin struct scatterlist *sg_ptr; 992ba39bd83SAlexander Shishkin void *block; 993ba39bd83SAlexander Shishkin int i, ret; 994ba39bd83SAlexander Shishkin 995bbbc08a1SAlexander Shishkin ret = sg_alloc_table(win->sgt, nr_segs, GFP_KERNEL); 996ba39bd83SAlexander Shishkin if (ret) 997ba39bd83SAlexander Shishkin return -ENOMEM; 998ba39bd83SAlexander Shishkin 999bbbc08a1SAlexander Shishkin for_each_sg(win->sgt->sgl, sg_ptr, nr_segs, i) { 1000ba39bd83SAlexander Shishkin block = dma_alloc_coherent(msc_dev(win->msc)->parent->parent, 1001ba39bd83SAlexander Shishkin PAGE_SIZE, &sg_dma_address(sg_ptr), 1002ba39bd83SAlexander Shishkin GFP_KERNEL); 1003ba39bd83SAlexander Shishkin if (!block) 1004ba39bd83SAlexander Shishkin goto err_nomem; 1005ba39bd83SAlexander Shishkin 1006ba39bd83SAlexander Shishkin sg_set_buf(sg_ptr, block, PAGE_SIZE); 1007ba39bd83SAlexander Shishkin } 1008ba39bd83SAlexander Shishkin 1009fa52b3feSAlexander Shishkin return nr_segs; 1010ba39bd83SAlexander Shishkin 1011ba39bd83SAlexander Shishkin err_nomem: 101257b69a1fSAlexander Shishkin for_each_sg(win->sgt->sgl, sg_ptr, i, ret) 1013ba39bd83SAlexander Shishkin dma_free_coherent(msc_dev(win->msc)->parent->parent, PAGE_SIZE, 101457b69a1fSAlexander Shishkin sg_virt(sg_ptr), sg_dma_address(sg_ptr)); 1015ba39bd83SAlexander Shishkin 1016bbbc08a1SAlexander Shishkin sg_free_table(win->sgt); 1017ba39bd83SAlexander Shishkin 1018ba39bd83SAlexander Shishkin return -ENOMEM; 1019ba39bd83SAlexander Shishkin } 1020ba39bd83SAlexander Shishkin 1021b96fb368SShaokun Zhang #ifdef CONFIG_X86 1022fa52b3feSAlexander Shishkin static void msc_buffer_set_uc(struct msc_window *win, unsigned int nr_segs) 1023b96fb368SShaokun Zhang { 102457b69a1fSAlexander Shishkin struct scatterlist *sg_ptr; 1025b96fb368SShaokun Zhang int i; 1026b96fb368SShaokun Zhang 102757b69a1fSAlexander Shishkin for_each_sg(win->sgt->sgl, sg_ptr, nr_segs, i) { 1028b96fb368SShaokun Zhang /* Set the page as uncached */ 102957b69a1fSAlexander Shishkin set_memory_uc((unsigned long)sg_virt(sg_ptr), 103057b69a1fSAlexander Shishkin PFN_DOWN(sg_ptr->length)); 103157b69a1fSAlexander Shishkin } 1032b96fb368SShaokun Zhang } 1033b96fb368SShaokun Zhang 1034b96fb368SShaokun Zhang static void msc_buffer_set_wb(struct msc_window *win) 1035b96fb368SShaokun Zhang { 103657b69a1fSAlexander Shishkin struct scatterlist *sg_ptr; 1037b96fb368SShaokun Zhang int i; 1038b96fb368SShaokun Zhang 103957b69a1fSAlexander Shishkin for_each_sg(win->sgt->sgl, sg_ptr, win->nr_segs, i) { 1040b96fb368SShaokun Zhang /* Reset the page to write-back */ 104157b69a1fSAlexander Shishkin set_memory_wb((unsigned long)sg_virt(sg_ptr), 104257b69a1fSAlexander Shishkin PFN_DOWN(sg_ptr->length)); 104357b69a1fSAlexander Shishkin } 1044b96fb368SShaokun Zhang } 1045b96fb368SShaokun Zhang #else /* !X86 */ 1046b96fb368SShaokun Zhang static inline void 1047fa52b3feSAlexander Shishkin msc_buffer_set_uc(struct msc_window *win, unsigned int nr_segs) {} 1048b96fb368SShaokun Zhang static inline void msc_buffer_set_wb(struct msc_window *win) {} 1049b96fb368SShaokun Zhang #endif /* CONFIG_X86 */ 1050b96fb368SShaokun Zhang 1051ba82664cSAlexander Shishkin /** 1052ba82664cSAlexander Shishkin * msc_buffer_win_alloc() - alloc a window for a multiblock mode 1053ba82664cSAlexander Shishkin * @msc: MSC device 1054ba82664cSAlexander Shishkin * @nr_blocks: number of pages in this window 1055ba82664cSAlexander Shishkin * 1056ba82664cSAlexander Shishkin * This modifies msc::win_list and msc::base, which requires msc::buf_mutex 1057ba82664cSAlexander Shishkin * to serialize, so the caller is expected to hold it. 1058ba82664cSAlexander Shishkin * 1059ba82664cSAlexander Shishkin * Return: 0 on success, -errno otherwise. 1060ba82664cSAlexander Shishkin */ 1061ba82664cSAlexander Shishkin static int msc_buffer_win_alloc(struct msc *msc, unsigned int nr_blocks) 1062ba82664cSAlexander Shishkin { 1063ba82664cSAlexander Shishkin struct msc_window *win; 1064b96fb368SShaokun Zhang int ret = -ENOMEM; 1065ba82664cSAlexander Shishkin 1066ba82664cSAlexander Shishkin if (!nr_blocks) 1067ba82664cSAlexander Shishkin return 0; 1068ba82664cSAlexander Shishkin 1069ba39bd83SAlexander Shishkin win = kzalloc(sizeof(*win), GFP_KERNEL); 1070ba82664cSAlexander Shishkin if (!win) 1071ba82664cSAlexander Shishkin return -ENOMEM; 1072ba82664cSAlexander Shishkin 1073ba39bd83SAlexander Shishkin win->msc = msc; 1074bbbc08a1SAlexander Shishkin win->sgt = &win->_sgt; 1075615c164dSAlexander Shishkin win->lockout = WIN_READY; 1076615c164dSAlexander Shishkin spin_lock_init(&win->lo_lock); 1077ba39bd83SAlexander Shishkin 1078ba82664cSAlexander Shishkin if (!list_empty(&msc->win_list)) { 10790de9e035SAlexander Shishkin struct msc_window *prev = list_last_entry(&msc->win_list, 10800de9e035SAlexander Shishkin struct msc_window, 10810de9e035SAlexander Shishkin entry); 1082ba82664cSAlexander Shishkin 1083ba82664cSAlexander Shishkin win->pgoff = prev->pgoff + prev->nr_blocks; 1084ba82664cSAlexander Shishkin } 1085ba82664cSAlexander Shishkin 1086615c164dSAlexander Shishkin if (msc->mbuf && msc->mbuf->alloc_window) 1087615c164dSAlexander Shishkin ret = msc->mbuf->alloc_window(msc->mbuf_priv, &win->sgt, 1088615c164dSAlexander Shishkin nr_blocks << PAGE_SHIFT); 1089615c164dSAlexander Shishkin else 1090ba39bd83SAlexander Shishkin ret = __msc_buffer_win_alloc(win, nr_blocks); 1091615c164dSAlexander Shishkin 1092615c164dSAlexander Shishkin if (ret <= 0) 1093d5c435dfSAlexander Shishkin goto err_nomem; 1094ba82664cSAlexander Shishkin 1095b96fb368SShaokun Zhang msc_buffer_set_uc(win, ret); 1096ba82664cSAlexander Shishkin 1097fa52b3feSAlexander Shishkin win->nr_segs = ret; 1098fa52b3feSAlexander Shishkin win->nr_blocks = nr_blocks; 1099ba82664cSAlexander Shishkin 1100ba82664cSAlexander Shishkin if (list_empty(&msc->win_list)) { 110157b69a1fSAlexander Shishkin msc->base = msc_win_base(win); 110257b69a1fSAlexander Shishkin msc->base_addr = msc_win_base_dma(win); 1103aad14ad3SAlexander Shishkin msc->cur_win = win; 1104ba82664cSAlexander Shishkin } 1105ba82664cSAlexander Shishkin 1106ba82664cSAlexander Shishkin list_add_tail(&win->entry, &msc->win_list); 1107ba82664cSAlexander Shishkin msc->nr_pages += nr_blocks; 1108ba82664cSAlexander Shishkin 1109ba82664cSAlexander Shishkin return 0; 1110ba82664cSAlexander Shishkin 1111ba82664cSAlexander Shishkin err_nomem: 1112ba82664cSAlexander Shishkin kfree(win); 1113ba82664cSAlexander Shishkin 1114ba82664cSAlexander Shishkin return ret; 1115ba82664cSAlexander Shishkin } 1116ba82664cSAlexander Shishkin 1117ba39bd83SAlexander Shishkin static void __msc_buffer_win_free(struct msc *msc, struct msc_window *win) 1118ba39bd83SAlexander Shishkin { 111957b69a1fSAlexander Shishkin struct scatterlist *sg; 1120ba39bd83SAlexander Shishkin int i; 1121ba39bd83SAlexander Shishkin 112257b69a1fSAlexander Shishkin for_each_sg(win->sgt->sgl, sg, win->nr_segs, i) { 112357b69a1fSAlexander Shishkin struct page *page = sg_page(sg); 1124ba39bd83SAlexander Shishkin 1125ba39bd83SAlexander Shishkin page->mapping = NULL; 1126ba39bd83SAlexander Shishkin dma_free_coherent(msc_dev(win->msc)->parent->parent, PAGE_SIZE, 112757b69a1fSAlexander Shishkin sg_virt(sg), sg_dma_address(sg)); 1128ba39bd83SAlexander Shishkin } 1129bbbc08a1SAlexander Shishkin sg_free_table(win->sgt); 1130ba39bd83SAlexander Shishkin } 1131ba39bd83SAlexander Shishkin 1132ba82664cSAlexander Shishkin /** 1133ba82664cSAlexander Shishkin * msc_buffer_win_free() - free a window from MSC's window list 1134ba82664cSAlexander Shishkin * @msc: MSC device 1135ba82664cSAlexander Shishkin * @win: window to free 1136ba82664cSAlexander Shishkin * 1137ba82664cSAlexander Shishkin * This modifies msc::win_list and msc::base, which requires msc::buf_mutex 1138ba82664cSAlexander Shishkin * to serialize, so the caller is expected to hold it. 1139ba82664cSAlexander Shishkin */ 1140ba82664cSAlexander Shishkin static void msc_buffer_win_free(struct msc *msc, struct msc_window *win) 1141ba82664cSAlexander Shishkin { 1142ba82664cSAlexander Shishkin msc->nr_pages -= win->nr_blocks; 1143ba82664cSAlexander Shishkin 1144ba82664cSAlexander Shishkin list_del(&win->entry); 1145ba82664cSAlexander Shishkin if (list_empty(&msc->win_list)) { 1146ba82664cSAlexander Shishkin msc->base = NULL; 1147ba82664cSAlexander Shishkin msc->base_addr = 0; 1148ba82664cSAlexander Shishkin } 1149ba82664cSAlexander Shishkin 1150b96fb368SShaokun Zhang msc_buffer_set_wb(win); 1151ba39bd83SAlexander Shishkin 1152615c164dSAlexander Shishkin if (msc->mbuf && msc->mbuf->free_window) 1153615c164dSAlexander Shishkin msc->mbuf->free_window(msc->mbuf_priv, win->sgt); 1154615c164dSAlexander Shishkin else 1155ba39bd83SAlexander Shishkin __msc_buffer_win_free(msc, win); 1156ba82664cSAlexander Shishkin 1157ba82664cSAlexander Shishkin kfree(win); 1158ba82664cSAlexander Shishkin } 1159ba82664cSAlexander Shishkin 1160ba82664cSAlexander Shishkin /** 1161ba82664cSAlexander Shishkin * msc_buffer_relink() - set up block descriptors for multiblock mode 1162ba82664cSAlexander Shishkin * @msc: MSC device 1163ba82664cSAlexander Shishkin * 1164ba82664cSAlexander Shishkin * This traverses msc::win_list, which requires msc::buf_mutex to serialize, 1165ba82664cSAlexander Shishkin * so the caller is expected to hold it. 1166ba82664cSAlexander Shishkin */ 1167ba82664cSAlexander Shishkin static void msc_buffer_relink(struct msc *msc) 1168ba82664cSAlexander Shishkin { 1169ba82664cSAlexander Shishkin struct msc_window *win, *next_win; 1170ba82664cSAlexander Shishkin 1171ba82664cSAlexander Shishkin /* call with msc::mutex locked */ 1172ba82664cSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) { 117357b69a1fSAlexander Shishkin struct scatterlist *sg; 1174ba82664cSAlexander Shishkin unsigned int blk; 1175ba82664cSAlexander Shishkin u32 sw_tag = 0; 1176ba82664cSAlexander Shishkin 1177ba82664cSAlexander Shishkin /* 1178ba82664cSAlexander Shishkin * Last window's next_win should point to the first window 1179ba82664cSAlexander Shishkin * and MSC_SW_TAG_LASTWIN should be set. 1180ba82664cSAlexander Shishkin */ 1181ba82664cSAlexander Shishkin if (msc_is_last_win(win)) { 1182ba82664cSAlexander Shishkin sw_tag |= MSC_SW_TAG_LASTWIN; 11830de9e035SAlexander Shishkin next_win = list_first_entry(&msc->win_list, 1184ba82664cSAlexander Shishkin struct msc_window, entry); 1185ba82664cSAlexander Shishkin } else { 11860de9e035SAlexander Shishkin next_win = list_next_entry(win, entry); 1187ba82664cSAlexander Shishkin } 1188ba82664cSAlexander Shishkin 118957b69a1fSAlexander Shishkin for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) { 119057b69a1fSAlexander Shishkin struct msc_block_desc *bdesc = sg_virt(sg); 1191ba82664cSAlexander Shishkin 1192ba82664cSAlexander Shishkin memset(bdesc, 0, sizeof(*bdesc)); 1193ba82664cSAlexander Shishkin 119457b69a1fSAlexander Shishkin bdesc->next_win = msc_win_base_pfn(next_win); 1195ba82664cSAlexander Shishkin 1196ba82664cSAlexander Shishkin /* 1197ba82664cSAlexander Shishkin * Similarly to last window, last block should point 1198ba82664cSAlexander Shishkin * to the first one. 1199ba82664cSAlexander Shishkin */ 1200fa52b3feSAlexander Shishkin if (blk == win->nr_segs - 1) { 1201ba82664cSAlexander Shishkin sw_tag |= MSC_SW_TAG_LASTBLK; 120257b69a1fSAlexander Shishkin bdesc->next_blk = msc_win_base_pfn(win); 1203ba82664cSAlexander Shishkin } else { 120457b69a1fSAlexander Shishkin dma_addr_t addr = sg_dma_address(sg_next(sg)); 120557b69a1fSAlexander Shishkin 120657b69a1fSAlexander Shishkin bdesc->next_blk = PFN_DOWN(addr); 1207ba82664cSAlexander Shishkin } 1208ba82664cSAlexander Shishkin 1209ba82664cSAlexander Shishkin bdesc->sw_tag = sw_tag; 121057b69a1fSAlexander Shishkin bdesc->block_sz = sg->length / 64; 1211ba82664cSAlexander Shishkin } 1212ba82664cSAlexander Shishkin } 1213ba82664cSAlexander Shishkin 1214ba82664cSAlexander Shishkin /* 1215ba82664cSAlexander Shishkin * Make the above writes globally visible before tracing is 1216ba82664cSAlexander Shishkin * enabled to make sure hardware sees them coherently. 1217ba82664cSAlexander Shishkin */ 1218ba82664cSAlexander Shishkin wmb(); 1219ba82664cSAlexander Shishkin } 1220ba82664cSAlexander Shishkin 1221ba82664cSAlexander Shishkin static void msc_buffer_multi_free(struct msc *msc) 1222ba82664cSAlexander Shishkin { 1223ba82664cSAlexander Shishkin struct msc_window *win, *iter; 1224ba82664cSAlexander Shishkin 1225ba82664cSAlexander Shishkin list_for_each_entry_safe(win, iter, &msc->win_list, entry) 1226ba82664cSAlexander Shishkin msc_buffer_win_free(msc, win); 1227ba82664cSAlexander Shishkin } 1228ba82664cSAlexander Shishkin 1229ba82664cSAlexander Shishkin static int msc_buffer_multi_alloc(struct msc *msc, unsigned long *nr_pages, 1230ba82664cSAlexander Shishkin unsigned int nr_wins) 1231ba82664cSAlexander Shishkin { 1232ba82664cSAlexander Shishkin int ret, i; 1233ba82664cSAlexander Shishkin 1234ba82664cSAlexander Shishkin for (i = 0; i < nr_wins; i++) { 1235ba82664cSAlexander Shishkin ret = msc_buffer_win_alloc(msc, nr_pages[i]); 1236ba82664cSAlexander Shishkin if (ret) { 1237ba82664cSAlexander Shishkin msc_buffer_multi_free(msc); 1238ba82664cSAlexander Shishkin return ret; 1239ba82664cSAlexander Shishkin } 1240ba82664cSAlexander Shishkin } 1241ba82664cSAlexander Shishkin 1242ba82664cSAlexander Shishkin msc_buffer_relink(msc); 1243ba82664cSAlexander Shishkin 1244ba82664cSAlexander Shishkin return 0; 1245ba82664cSAlexander Shishkin } 1246ba82664cSAlexander Shishkin 1247ba82664cSAlexander Shishkin /** 1248ba82664cSAlexander Shishkin * msc_buffer_free() - free buffers for MSC 1249ba82664cSAlexander Shishkin * @msc: MSC device 1250ba82664cSAlexander Shishkin * 1251ba82664cSAlexander Shishkin * Free MSC's storage buffers. 1252ba82664cSAlexander Shishkin * 1253ba82664cSAlexander Shishkin * This modifies msc::win_list and msc::base, which requires msc::buf_mutex to 1254ba82664cSAlexander Shishkin * serialize, so the caller is expected to hold it. 1255ba82664cSAlexander Shishkin */ 1256ba82664cSAlexander Shishkin static void msc_buffer_free(struct msc *msc) 1257ba82664cSAlexander Shishkin { 1258ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) 1259ba82664cSAlexander Shishkin msc_buffer_contig_free(msc); 1260ba82664cSAlexander Shishkin else if (msc->mode == MSC_MODE_MULTI) 1261ba82664cSAlexander Shishkin msc_buffer_multi_free(msc); 1262ba82664cSAlexander Shishkin } 1263ba82664cSAlexander Shishkin 1264ba82664cSAlexander Shishkin /** 1265ba82664cSAlexander Shishkin * msc_buffer_alloc() - allocate a buffer for MSC 1266ba82664cSAlexander Shishkin * @msc: MSC device 1267ba82664cSAlexander Shishkin * @size: allocation size in bytes 1268ba82664cSAlexander Shishkin * 1269ba82664cSAlexander Shishkin * Allocate a storage buffer for MSC, depending on the msc::mode, it will be 1270ba82664cSAlexander Shishkin * either done via msc_buffer_contig_alloc() for SINGLE operation mode or 1271ba82664cSAlexander Shishkin * msc_buffer_win_alloc() for multiblock operation. The latter allocates one 1272ba82664cSAlexander Shishkin * window per invocation, so in multiblock mode this can be called multiple 1273ba82664cSAlexander Shishkin * times for the same MSC to allocate multiple windows. 1274ba82664cSAlexander Shishkin * 1275ba82664cSAlexander Shishkin * This modifies msc::win_list and msc::base, which requires msc::buf_mutex 1276ba82664cSAlexander Shishkin * to serialize, so the caller is expected to hold it. 1277ba82664cSAlexander Shishkin * 1278ba82664cSAlexander Shishkin * Return: 0 on success, -errno otherwise. 1279ba82664cSAlexander Shishkin */ 1280ba82664cSAlexander Shishkin static int msc_buffer_alloc(struct msc *msc, unsigned long *nr_pages, 1281ba82664cSAlexander Shishkin unsigned int nr_wins) 1282ba82664cSAlexander Shishkin { 1283ba82664cSAlexander Shishkin int ret; 1284ba82664cSAlexander Shishkin 1285ba82664cSAlexander Shishkin /* -1: buffer not allocated */ 1286ba82664cSAlexander Shishkin if (atomic_read(&msc->user_count) != -1) 1287ba82664cSAlexander Shishkin return -EBUSY; 1288ba82664cSAlexander Shishkin 1289ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) { 1290ba82664cSAlexander Shishkin if (nr_wins != 1) 1291ba82664cSAlexander Shishkin return -EINVAL; 1292ba82664cSAlexander Shishkin 1293ba82664cSAlexander Shishkin ret = msc_buffer_contig_alloc(msc, nr_pages[0] << PAGE_SHIFT); 1294ba82664cSAlexander Shishkin } else if (msc->mode == MSC_MODE_MULTI) { 1295ba82664cSAlexander Shishkin ret = msc_buffer_multi_alloc(msc, nr_pages, nr_wins); 1296ba82664cSAlexander Shishkin } else { 1297ba82664cSAlexander Shishkin ret = -ENOTSUPP; 1298ba82664cSAlexander Shishkin } 1299ba82664cSAlexander Shishkin 1300ba82664cSAlexander Shishkin if (!ret) { 1301ba82664cSAlexander Shishkin /* allocation should be visible before the counter goes to 0 */ 1302ba82664cSAlexander Shishkin smp_mb__before_atomic(); 1303ba82664cSAlexander Shishkin 1304ba82664cSAlexander Shishkin if (WARN_ON_ONCE(atomic_cmpxchg(&msc->user_count, -1, 0) != -1)) 1305ba82664cSAlexander Shishkin return -EINVAL; 1306ba82664cSAlexander Shishkin } 1307ba82664cSAlexander Shishkin 1308ba82664cSAlexander Shishkin return ret; 1309ba82664cSAlexander Shishkin } 1310ba82664cSAlexander Shishkin 1311ba82664cSAlexander Shishkin /** 1312ba82664cSAlexander Shishkin * msc_buffer_unlocked_free_unless_used() - free a buffer unless it's in use 1313ba82664cSAlexander Shishkin * @msc: MSC device 1314ba82664cSAlexander Shishkin * 1315ba82664cSAlexander Shishkin * This will free MSC buffer unless it is in use or there is no allocated 1316ba82664cSAlexander Shishkin * buffer. 1317ba82664cSAlexander Shishkin * Caller needs to hold msc::buf_mutex. 1318ba82664cSAlexander Shishkin * 1319ba82664cSAlexander Shishkin * Return: 0 on successful deallocation or if there was no buffer to 1320ba82664cSAlexander Shishkin * deallocate, -EBUSY if there are active users. 1321ba82664cSAlexander Shishkin */ 1322ba82664cSAlexander Shishkin static int msc_buffer_unlocked_free_unless_used(struct msc *msc) 1323ba82664cSAlexander Shishkin { 1324ba82664cSAlexander Shishkin int count, ret = 0; 1325ba82664cSAlexander Shishkin 1326ba82664cSAlexander Shishkin count = atomic_cmpxchg(&msc->user_count, 0, -1); 1327ba82664cSAlexander Shishkin 1328ba82664cSAlexander Shishkin /* > 0: buffer is allocated and has users */ 1329ba82664cSAlexander Shishkin if (count > 0) 1330ba82664cSAlexander Shishkin ret = -EBUSY; 1331ba82664cSAlexander Shishkin /* 0: buffer is allocated, no users */ 1332ba82664cSAlexander Shishkin else if (!count) 1333ba82664cSAlexander Shishkin msc_buffer_free(msc); 1334ba82664cSAlexander Shishkin /* < 0: no buffer, nothing to do */ 1335ba82664cSAlexander Shishkin 1336ba82664cSAlexander Shishkin return ret; 1337ba82664cSAlexander Shishkin } 1338ba82664cSAlexander Shishkin 1339ba82664cSAlexander Shishkin /** 1340ba82664cSAlexander Shishkin * msc_buffer_free_unless_used() - free a buffer unless it's in use 1341ba82664cSAlexander Shishkin * @msc: MSC device 1342ba82664cSAlexander Shishkin * 1343ba82664cSAlexander Shishkin * This is a locked version of msc_buffer_unlocked_free_unless_used(). 1344ba82664cSAlexander Shishkin */ 1345ba82664cSAlexander Shishkin static int msc_buffer_free_unless_used(struct msc *msc) 1346ba82664cSAlexander Shishkin { 1347ba82664cSAlexander Shishkin int ret; 1348ba82664cSAlexander Shishkin 1349ba82664cSAlexander Shishkin mutex_lock(&msc->buf_mutex); 1350ba82664cSAlexander Shishkin ret = msc_buffer_unlocked_free_unless_used(msc); 1351ba82664cSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 1352ba82664cSAlexander Shishkin 1353ba82664cSAlexander Shishkin return ret; 1354ba82664cSAlexander Shishkin } 1355ba82664cSAlexander Shishkin 1356ba82664cSAlexander Shishkin /** 1357ba82664cSAlexander Shishkin * msc_buffer_get_page() - get MSC buffer page at a given offset 1358ba82664cSAlexander Shishkin * @msc: MSC device 1359ba82664cSAlexander Shishkin * @pgoff: page offset into the storage buffer 1360ba82664cSAlexander Shishkin * 1361ba82664cSAlexander Shishkin * This traverses msc::win_list, so holding msc::buf_mutex is expected from 1362ba82664cSAlexander Shishkin * the caller. 1363ba82664cSAlexander Shishkin * 1364ba82664cSAlexander Shishkin * Return: page if @pgoff corresponds to a valid buffer page or NULL. 1365ba82664cSAlexander Shishkin */ 1366ba82664cSAlexander Shishkin static struct page *msc_buffer_get_page(struct msc *msc, unsigned long pgoff) 1367ba82664cSAlexander Shishkin { 1368ba82664cSAlexander Shishkin struct msc_window *win; 136957b69a1fSAlexander Shishkin struct scatterlist *sg; 1370fa52b3feSAlexander Shishkin unsigned int blk; 1371ba82664cSAlexander Shishkin 1372ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) 1373ba82664cSAlexander Shishkin return msc_buffer_contig_get_page(msc, pgoff); 1374ba82664cSAlexander Shishkin 1375ba82664cSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) 1376ba82664cSAlexander Shishkin if (pgoff >= win->pgoff && pgoff < win->pgoff + win->nr_blocks) 1377ba82664cSAlexander Shishkin goto found; 1378ba82664cSAlexander Shishkin 1379ba82664cSAlexander Shishkin return NULL; 1380ba82664cSAlexander Shishkin 1381ba82664cSAlexander Shishkin found: 1382ba82664cSAlexander Shishkin pgoff -= win->pgoff; 1383fa52b3feSAlexander Shishkin 138457b69a1fSAlexander Shishkin for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) { 138557b69a1fSAlexander Shishkin struct page *page = sg_page(sg); 138657b69a1fSAlexander Shishkin size_t pgsz = PFN_DOWN(sg->length); 1387fa52b3feSAlexander Shishkin 1388fa52b3feSAlexander Shishkin if (pgoff < pgsz) 1389fa52b3feSAlexander Shishkin return page + pgoff; 1390fa52b3feSAlexander Shishkin 1391fa52b3feSAlexander Shishkin pgoff -= pgsz; 1392fa52b3feSAlexander Shishkin } 1393fa52b3feSAlexander Shishkin 1394fa52b3feSAlexander Shishkin return NULL; 1395ba82664cSAlexander Shishkin } 1396ba82664cSAlexander Shishkin 1397ba82664cSAlexander Shishkin /** 1398ba82664cSAlexander Shishkin * struct msc_win_to_user_struct - data for copy_to_user() callback 1399ba82664cSAlexander Shishkin * @buf: userspace buffer to copy data to 1400ba82664cSAlexander Shishkin * @offset: running offset 1401ba82664cSAlexander Shishkin */ 1402ba82664cSAlexander Shishkin struct msc_win_to_user_struct { 1403ba82664cSAlexander Shishkin char __user *buf; 1404ba82664cSAlexander Shishkin unsigned long offset; 1405ba82664cSAlexander Shishkin }; 1406ba82664cSAlexander Shishkin 1407ba82664cSAlexander Shishkin /** 1408ba82664cSAlexander Shishkin * msc_win_to_user() - iterator for msc_buffer_iterate() to copy data to user 1409ba82664cSAlexander Shishkin * @data: callback's private data 1410ba82664cSAlexander Shishkin * @src: source buffer 1411ba82664cSAlexander Shishkin * @len: amount of data to copy from the source buffer 1412ba82664cSAlexander Shishkin */ 1413ba82664cSAlexander Shishkin static unsigned long msc_win_to_user(void *data, void *src, size_t len) 1414ba82664cSAlexander Shishkin { 1415ba82664cSAlexander Shishkin struct msc_win_to_user_struct *u = data; 1416ba82664cSAlexander Shishkin unsigned long ret; 1417ba82664cSAlexander Shishkin 1418ba82664cSAlexander Shishkin ret = copy_to_user(u->buf + u->offset, src, len); 1419ba82664cSAlexander Shishkin u->offset += len - ret; 1420ba82664cSAlexander Shishkin 1421ba82664cSAlexander Shishkin return ret; 1422ba82664cSAlexander Shishkin } 1423ba82664cSAlexander Shishkin 1424ba82664cSAlexander Shishkin 1425ba82664cSAlexander Shishkin /* 1426ba82664cSAlexander Shishkin * file operations' callbacks 1427ba82664cSAlexander Shishkin */ 1428ba82664cSAlexander Shishkin 1429ba82664cSAlexander Shishkin static int intel_th_msc_open(struct inode *inode, struct file *file) 1430ba82664cSAlexander Shishkin { 1431ba82664cSAlexander Shishkin struct intel_th_device *thdev = file->private_data; 1432ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 1433ba82664cSAlexander Shishkin struct msc_iter *iter; 1434ba82664cSAlexander Shishkin 1435ba82664cSAlexander Shishkin if (!capable(CAP_SYS_RAWIO)) 1436ba82664cSAlexander Shishkin return -EPERM; 1437ba82664cSAlexander Shishkin 1438ba82664cSAlexander Shishkin iter = msc_iter_install(msc); 1439a45ff6edSAlexander Shishkin if (IS_ERR(iter)) 1440a45ff6edSAlexander Shishkin return PTR_ERR(iter); 1441ba82664cSAlexander Shishkin 1442ba82664cSAlexander Shishkin file->private_data = iter; 1443ba82664cSAlexander Shishkin 1444ba82664cSAlexander Shishkin return nonseekable_open(inode, file); 1445ba82664cSAlexander Shishkin } 1446ba82664cSAlexander Shishkin 1447ba82664cSAlexander Shishkin static int intel_th_msc_release(struct inode *inode, struct file *file) 1448ba82664cSAlexander Shishkin { 1449ba82664cSAlexander Shishkin struct msc_iter *iter = file->private_data; 1450ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1451ba82664cSAlexander Shishkin 1452ba82664cSAlexander Shishkin msc_iter_remove(iter, msc); 1453ba82664cSAlexander Shishkin 1454ba82664cSAlexander Shishkin return 0; 1455ba82664cSAlexander Shishkin } 1456ba82664cSAlexander Shishkin 1457ba82664cSAlexander Shishkin static ssize_t 1458ba82664cSAlexander Shishkin msc_single_to_user(struct msc *msc, char __user *buf, loff_t off, size_t len) 1459ba82664cSAlexander Shishkin { 1460ed392688SAlexander Shishkin unsigned long size = msc->nr_pages << PAGE_SHIFT, rem = len; 1461ba82664cSAlexander Shishkin unsigned long start = off, tocopy = 0; 1462ba82664cSAlexander Shishkin 1463ba82664cSAlexander Shishkin if (msc->single_wrap) { 1464ba82664cSAlexander Shishkin start += msc->single_sz; 1465ba82664cSAlexander Shishkin if (start < size) { 1466ba82664cSAlexander Shishkin tocopy = min(rem, size - start); 1467ba82664cSAlexander Shishkin if (copy_to_user(buf, msc->base + start, tocopy)) 1468ba82664cSAlexander Shishkin return -EFAULT; 1469ba82664cSAlexander Shishkin 1470ba82664cSAlexander Shishkin buf += tocopy; 1471ba82664cSAlexander Shishkin rem -= tocopy; 1472ba82664cSAlexander Shishkin start += tocopy; 1473ba82664cSAlexander Shishkin } 1474ba82664cSAlexander Shishkin 1475ba82664cSAlexander Shishkin start &= size - 1; 1476ba82664cSAlexander Shishkin if (rem) { 1477ba82664cSAlexander Shishkin tocopy = min(rem, msc->single_sz - start); 1478ba82664cSAlexander Shishkin if (copy_to_user(buf, msc->base + start, tocopy)) 1479ba82664cSAlexander Shishkin return -EFAULT; 1480ba82664cSAlexander Shishkin 1481ba82664cSAlexander Shishkin rem -= tocopy; 1482ba82664cSAlexander Shishkin } 1483ba82664cSAlexander Shishkin 1484ba82664cSAlexander Shishkin return len - rem; 1485ba82664cSAlexander Shishkin } 1486ba82664cSAlexander Shishkin 1487ba82664cSAlexander Shishkin if (copy_to_user(buf, msc->base + start, rem)) 1488ba82664cSAlexander Shishkin return -EFAULT; 1489ba82664cSAlexander Shishkin 1490ba82664cSAlexander Shishkin return len; 1491ba82664cSAlexander Shishkin } 1492ba82664cSAlexander Shishkin 1493ba82664cSAlexander Shishkin static ssize_t intel_th_msc_read(struct file *file, char __user *buf, 1494ba82664cSAlexander Shishkin size_t len, loff_t *ppos) 1495ba82664cSAlexander Shishkin { 1496ba82664cSAlexander Shishkin struct msc_iter *iter = file->private_data; 1497ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1498ba82664cSAlexander Shishkin size_t size; 1499ba82664cSAlexander Shishkin loff_t off = *ppos; 1500ba82664cSAlexander Shishkin ssize_t ret = 0; 1501ba82664cSAlexander Shishkin 1502ba82664cSAlexander Shishkin if (!atomic_inc_unless_negative(&msc->user_count)) 1503ba82664cSAlexander Shishkin return 0; 1504ba82664cSAlexander Shishkin 1505ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE && !msc->single_wrap) 1506ba82664cSAlexander Shishkin size = msc->single_sz; 1507ba82664cSAlexander Shishkin else 1508ba82664cSAlexander Shishkin size = msc->nr_pages << PAGE_SHIFT; 1509ba82664cSAlexander Shishkin 1510ba82664cSAlexander Shishkin if (!size) 1511ba82664cSAlexander Shishkin goto put_count; 15122bed074aSLaurent FERT 15132bed074aSLaurent FERT if (off >= size) 15142bed074aSLaurent FERT goto put_count; 15152bed074aSLaurent FERT 1516ba82664cSAlexander Shishkin if (off + len >= size) 1517ba82664cSAlexander Shishkin len = size - off; 1518ba82664cSAlexander Shishkin 1519ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) { 1520ba82664cSAlexander Shishkin ret = msc_single_to_user(msc, buf, off, len); 1521ba82664cSAlexander Shishkin if (ret >= 0) 1522ba82664cSAlexander Shishkin *ppos += ret; 1523ba82664cSAlexander Shishkin } else if (msc->mode == MSC_MODE_MULTI) { 1524ba82664cSAlexander Shishkin struct msc_win_to_user_struct u = { 1525ba82664cSAlexander Shishkin .buf = buf, 1526ba82664cSAlexander Shishkin .offset = 0, 1527ba82664cSAlexander Shishkin }; 1528ba82664cSAlexander Shishkin 1529ba82664cSAlexander Shishkin ret = msc_buffer_iterate(iter, len, &u, msc_win_to_user); 1530ba82664cSAlexander Shishkin if (ret >= 0) 1531ba82664cSAlexander Shishkin *ppos = iter->offset; 1532ba82664cSAlexander Shishkin } else { 1533ba82664cSAlexander Shishkin ret = -ENOTSUPP; 1534ba82664cSAlexander Shishkin } 1535ba82664cSAlexander Shishkin 1536ba82664cSAlexander Shishkin put_count: 1537ba82664cSAlexander Shishkin atomic_dec(&msc->user_count); 1538ba82664cSAlexander Shishkin 1539ba82664cSAlexander Shishkin return ret; 1540ba82664cSAlexander Shishkin } 1541ba82664cSAlexander Shishkin 1542ba82664cSAlexander Shishkin /* 1543ba82664cSAlexander Shishkin * vm operations callbacks (vm_ops) 1544ba82664cSAlexander Shishkin */ 1545ba82664cSAlexander Shishkin 1546ba82664cSAlexander Shishkin static void msc_mmap_open(struct vm_area_struct *vma) 1547ba82664cSAlexander Shishkin { 1548ba82664cSAlexander Shishkin struct msc_iter *iter = vma->vm_file->private_data; 1549ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1550ba82664cSAlexander Shishkin 1551ba82664cSAlexander Shishkin atomic_inc(&msc->mmap_count); 1552ba82664cSAlexander Shishkin } 1553ba82664cSAlexander Shishkin 1554ba82664cSAlexander Shishkin static void msc_mmap_close(struct vm_area_struct *vma) 1555ba82664cSAlexander Shishkin { 1556ba82664cSAlexander Shishkin struct msc_iter *iter = vma->vm_file->private_data; 1557ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1558ba82664cSAlexander Shishkin unsigned long pg; 1559ba82664cSAlexander Shishkin 1560ba82664cSAlexander Shishkin if (!atomic_dec_and_mutex_lock(&msc->mmap_count, &msc->buf_mutex)) 1561ba82664cSAlexander Shishkin return; 1562ba82664cSAlexander Shishkin 15630139aa7bSJoonsoo Kim /* drop page _refcounts */ 1564ba82664cSAlexander Shishkin for (pg = 0; pg < msc->nr_pages; pg++) { 1565ba82664cSAlexander Shishkin struct page *page = msc_buffer_get_page(msc, pg); 1566ba82664cSAlexander Shishkin 1567ba82664cSAlexander Shishkin if (WARN_ON_ONCE(!page)) 1568ba82664cSAlexander Shishkin continue; 1569ba82664cSAlexander Shishkin 1570ba82664cSAlexander Shishkin if (page->mapping) 1571ba82664cSAlexander Shishkin page->mapping = NULL; 1572ba82664cSAlexander Shishkin } 1573ba82664cSAlexander Shishkin 1574ba82664cSAlexander Shishkin /* last mapping -- drop user_count */ 1575ba82664cSAlexander Shishkin atomic_dec(&msc->user_count); 1576ba82664cSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 1577ba82664cSAlexander Shishkin } 1578ba82664cSAlexander Shishkin 157942df0509SSouptick Joarder static vm_fault_t msc_mmap_fault(struct vm_fault *vmf) 1580ba82664cSAlexander Shishkin { 158111bac800SDave Jiang struct msc_iter *iter = vmf->vma->vm_file->private_data; 1582ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1583ba82664cSAlexander Shishkin 1584ba82664cSAlexander Shishkin vmf->page = msc_buffer_get_page(msc, vmf->pgoff); 1585ba82664cSAlexander Shishkin if (!vmf->page) 1586ba82664cSAlexander Shishkin return VM_FAULT_SIGBUS; 1587ba82664cSAlexander Shishkin 1588ba82664cSAlexander Shishkin get_page(vmf->page); 158911bac800SDave Jiang vmf->page->mapping = vmf->vma->vm_file->f_mapping; 1590ba82664cSAlexander Shishkin vmf->page->index = vmf->pgoff; 1591ba82664cSAlexander Shishkin 1592ba82664cSAlexander Shishkin return 0; 1593ba82664cSAlexander Shishkin } 1594ba82664cSAlexander Shishkin 1595ba82664cSAlexander Shishkin static const struct vm_operations_struct msc_mmap_ops = { 1596ba82664cSAlexander Shishkin .open = msc_mmap_open, 1597ba82664cSAlexander Shishkin .close = msc_mmap_close, 1598ba82664cSAlexander Shishkin .fault = msc_mmap_fault, 1599ba82664cSAlexander Shishkin }; 1600ba82664cSAlexander Shishkin 1601ba82664cSAlexander Shishkin static int intel_th_msc_mmap(struct file *file, struct vm_area_struct *vma) 1602ba82664cSAlexander Shishkin { 1603ba82664cSAlexander Shishkin unsigned long size = vma->vm_end - vma->vm_start; 1604ba82664cSAlexander Shishkin struct msc_iter *iter = vma->vm_file->private_data; 1605ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1606ba82664cSAlexander Shishkin int ret = -EINVAL; 1607ba82664cSAlexander Shishkin 1608ba82664cSAlexander Shishkin if (!size || offset_in_page(size)) 1609ba82664cSAlexander Shishkin return -EINVAL; 1610ba82664cSAlexander Shishkin 1611ba82664cSAlexander Shishkin if (vma->vm_pgoff) 1612ba82664cSAlexander Shishkin return -EINVAL; 1613ba82664cSAlexander Shishkin 1614ba82664cSAlexander Shishkin /* grab user_count once per mmap; drop in msc_mmap_close() */ 1615ba82664cSAlexander Shishkin if (!atomic_inc_unless_negative(&msc->user_count)) 1616ba82664cSAlexander Shishkin return -EINVAL; 1617ba82664cSAlexander Shishkin 1618ba82664cSAlexander Shishkin if (msc->mode != MSC_MODE_SINGLE && 1619ba82664cSAlexander Shishkin msc->mode != MSC_MODE_MULTI) 1620ba82664cSAlexander Shishkin goto out; 1621ba82664cSAlexander Shishkin 1622ba82664cSAlexander Shishkin if (size >> PAGE_SHIFT != msc->nr_pages) 1623ba82664cSAlexander Shishkin goto out; 1624ba82664cSAlexander Shishkin 1625ba82664cSAlexander Shishkin atomic_set(&msc->mmap_count, 1); 1626ba82664cSAlexander Shishkin ret = 0; 1627ba82664cSAlexander Shishkin 1628ba82664cSAlexander Shishkin out: 1629ba82664cSAlexander Shishkin if (ret) 1630ba82664cSAlexander Shishkin atomic_dec(&msc->user_count); 1631ba82664cSAlexander Shishkin 1632ba82664cSAlexander Shishkin vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 1633ba82664cSAlexander Shishkin vma->vm_flags |= VM_DONTEXPAND | VM_DONTCOPY; 1634ba82664cSAlexander Shishkin vma->vm_ops = &msc_mmap_ops; 1635ba82664cSAlexander Shishkin return ret; 1636ba82664cSAlexander Shishkin } 1637ba82664cSAlexander Shishkin 1638ba82664cSAlexander Shishkin static const struct file_operations intel_th_msc_fops = { 1639ba82664cSAlexander Shishkin .open = intel_th_msc_open, 1640ba82664cSAlexander Shishkin .release = intel_th_msc_release, 1641ba82664cSAlexander Shishkin .read = intel_th_msc_read, 1642ba82664cSAlexander Shishkin .mmap = intel_th_msc_mmap, 1643ba82664cSAlexander Shishkin .llseek = no_llseek, 16448e9a2bebSAlexander Shishkin .owner = THIS_MODULE, 1645ba82664cSAlexander Shishkin }; 1646ba82664cSAlexander Shishkin 16478d415512SAlexander Shishkin static void intel_th_msc_wait_empty(struct intel_th_device *thdev) 16488d415512SAlexander Shishkin { 16498d415512SAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 16508d415512SAlexander Shishkin unsigned long count; 16518d415512SAlexander Shishkin u32 reg; 16528d415512SAlexander Shishkin 16538d415512SAlexander Shishkin for (reg = 0, count = MSC_PLE_WAITLOOP_DEPTH; 16548d415512SAlexander Shishkin count && !(reg & MSCSTS_PLE); count--) { 16558d415512SAlexander Shishkin reg = __raw_readl(msc->reg_base + REG_MSU_MSC0STS); 16568d415512SAlexander Shishkin cpu_relax(); 16578d415512SAlexander Shishkin } 16588d415512SAlexander Shishkin 16598d415512SAlexander Shishkin if (!count) 16608d415512SAlexander Shishkin dev_dbg(msc_dev(msc), "timeout waiting for MSC0 PLE\n"); 16618d415512SAlexander Shishkin } 16628d415512SAlexander Shishkin 1663ba82664cSAlexander Shishkin static int intel_th_msc_init(struct msc *msc) 1664ba82664cSAlexander Shishkin { 1665ba82664cSAlexander Shishkin atomic_set(&msc->user_count, -1); 1666ba82664cSAlexander Shishkin 1667ba82664cSAlexander Shishkin msc->mode = MSC_MODE_MULTI; 1668ba82664cSAlexander Shishkin mutex_init(&msc->buf_mutex); 1669ba82664cSAlexander Shishkin INIT_LIST_HEAD(&msc->win_list); 1670ba82664cSAlexander Shishkin INIT_LIST_HEAD(&msc->iter_list); 1671ba82664cSAlexander Shishkin 1672ba82664cSAlexander Shishkin msc->burst_len = 1673ba82664cSAlexander Shishkin (ioread32(msc->reg_base + REG_MSU_MSC0CTL) & MSC_LEN) >> 1674ba82664cSAlexander Shishkin __ffs(MSC_LEN); 1675ba82664cSAlexander Shishkin 1676ba82664cSAlexander Shishkin return 0; 1677ba82664cSAlexander Shishkin } 1678ba82664cSAlexander Shishkin 1679aad14ad3SAlexander Shishkin static void msc_win_switch(struct msc *msc) 1680aad14ad3SAlexander Shishkin { 16819800db28SYueHaibing struct msc_window *first; 1682aad14ad3SAlexander Shishkin 1683aad14ad3SAlexander Shishkin first = list_first_entry(&msc->win_list, struct msc_window, entry); 1684aad14ad3SAlexander Shishkin 1685aad14ad3SAlexander Shishkin if (msc_is_last_win(msc->cur_win)) 1686aad14ad3SAlexander Shishkin msc->cur_win = first; 1687aad14ad3SAlexander Shishkin else 1688aad14ad3SAlexander Shishkin msc->cur_win = list_next_entry(msc->cur_win, entry); 1689aad14ad3SAlexander Shishkin 169057b69a1fSAlexander Shishkin msc->base = msc_win_base(msc->cur_win); 169157b69a1fSAlexander Shishkin msc->base_addr = msc_win_base_dma(msc->cur_win); 1692aad14ad3SAlexander Shishkin 1693aad14ad3SAlexander Shishkin intel_th_trace_switch(msc->thdev); 1694aad14ad3SAlexander Shishkin } 1695aad14ad3SAlexander Shishkin 1696615c164dSAlexander Shishkin /** 1697615c164dSAlexander Shishkin * intel_th_msc_window_unlock - put the window back in rotation 1698615c164dSAlexander Shishkin * @dev: MSC device to which this relates 1699615c164dSAlexander Shishkin * @sgt: buffer's sg_table for the window, does nothing if NULL 1700615c164dSAlexander Shishkin */ 1701615c164dSAlexander Shishkin void intel_th_msc_window_unlock(struct device *dev, struct sg_table *sgt) 1702615c164dSAlexander Shishkin { 1703615c164dSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1704615c164dSAlexander Shishkin struct msc_window *win; 1705615c164dSAlexander Shishkin 1706615c164dSAlexander Shishkin if (!sgt) 1707615c164dSAlexander Shishkin return; 1708615c164dSAlexander Shishkin 1709615c164dSAlexander Shishkin win = msc_find_window(msc, sgt, false); 1710615c164dSAlexander Shishkin if (!win) 1711615c164dSAlexander Shishkin return; 1712615c164dSAlexander Shishkin 1713615c164dSAlexander Shishkin msc_win_set_lockout(win, WIN_LOCKED, WIN_READY); 1714615c164dSAlexander Shishkin } 1715615c164dSAlexander Shishkin EXPORT_SYMBOL_GPL(intel_th_msc_window_unlock); 1716615c164dSAlexander Shishkin 1717615c164dSAlexander Shishkin static void msc_work(struct work_struct *work) 1718615c164dSAlexander Shishkin { 1719615c164dSAlexander Shishkin struct msc *msc = container_of(work, struct msc, work); 1720615c164dSAlexander Shishkin 1721615c164dSAlexander Shishkin intel_th_msc_deactivate(msc->thdev); 1722615c164dSAlexander Shishkin } 1723615c164dSAlexander Shishkin 1724aac8da65SAlexander Shishkin static irqreturn_t intel_th_msc_interrupt(struct intel_th_device *thdev) 1725aac8da65SAlexander Shishkin { 1726aac8da65SAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 1727aac8da65SAlexander Shishkin u32 msusts = ioread32(msc->msu_base + REG_MSU_MSUSTS); 1728aac8da65SAlexander Shishkin u32 mask = msc->index ? MSUSTS_MSC1BLAST : MSUSTS_MSC0BLAST; 1729615c164dSAlexander Shishkin struct msc_window *win, *next_win; 1730aac8da65SAlexander Shishkin 1731615c164dSAlexander Shishkin if (!msc->do_irq || !msc->mbuf) 1732aac8da65SAlexander Shishkin return IRQ_NONE; 1733615c164dSAlexander Shishkin 1734615c164dSAlexander Shishkin msusts &= mask; 1735615c164dSAlexander Shishkin 1736615c164dSAlexander Shishkin if (!msusts) 1737615c164dSAlexander Shishkin return msc->enabled ? IRQ_HANDLED : IRQ_NONE; 1738615c164dSAlexander Shishkin 1739615c164dSAlexander Shishkin iowrite32(msusts, msc->msu_base + REG_MSU_MSUSTS); 1740615c164dSAlexander Shishkin 1741615c164dSAlexander Shishkin if (!msc->enabled) 1742615c164dSAlexander Shishkin return IRQ_NONE; 1743615c164dSAlexander Shishkin 1744615c164dSAlexander Shishkin /* grab the window before we do the switch */ 1745615c164dSAlexander Shishkin win = msc->cur_win; 1746615c164dSAlexander Shishkin if (!win) 1747615c164dSAlexander Shishkin return IRQ_HANDLED; 1748615c164dSAlexander Shishkin next_win = msc_next_window(win); 1749615c164dSAlexander Shishkin if (!next_win) 1750615c164dSAlexander Shishkin return IRQ_HANDLED; 1751615c164dSAlexander Shishkin 1752615c164dSAlexander Shishkin /* next window: if READY, proceed, if LOCKED, stop the trace */ 1753615c164dSAlexander Shishkin if (msc_win_set_lockout(next_win, WIN_READY, WIN_INUSE)) { 1754615c164dSAlexander Shishkin schedule_work(&msc->work); 1755615c164dSAlexander Shishkin return IRQ_HANDLED; 1756aac8da65SAlexander Shishkin } 1757aac8da65SAlexander Shishkin 1758615c164dSAlexander Shishkin /* current window: INUSE -> LOCKED */ 1759615c164dSAlexander Shishkin msc_win_set_lockout(win, WIN_INUSE, WIN_LOCKED); 1760615c164dSAlexander Shishkin 1761615c164dSAlexander Shishkin msc_win_switch(msc); 1762615c164dSAlexander Shishkin 1763615c164dSAlexander Shishkin if (msc->mbuf && msc->mbuf->ready) 1764615c164dSAlexander Shishkin msc->mbuf->ready(msc->mbuf_priv, win->sgt, 1765615c164dSAlexander Shishkin msc_win_total_sz(win)); 1766615c164dSAlexander Shishkin 1767aac8da65SAlexander Shishkin return IRQ_HANDLED; 1768aac8da65SAlexander Shishkin } 1769aac8da65SAlexander Shishkin 1770ba82664cSAlexander Shishkin static const char * const msc_mode[] = { 1771ba82664cSAlexander Shishkin [MSC_MODE_SINGLE] = "single", 1772ba82664cSAlexander Shishkin [MSC_MODE_MULTI] = "multi", 1773ba82664cSAlexander Shishkin [MSC_MODE_EXI] = "ExI", 1774ba82664cSAlexander Shishkin [MSC_MODE_DEBUG] = "debug", 1775ba82664cSAlexander Shishkin }; 1776ba82664cSAlexander Shishkin 1777ba82664cSAlexander Shishkin static ssize_t 1778ba82664cSAlexander Shishkin wrap_show(struct device *dev, struct device_attribute *attr, char *buf) 1779ba82664cSAlexander Shishkin { 1780ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1781ba82664cSAlexander Shishkin 1782ba82664cSAlexander Shishkin return scnprintf(buf, PAGE_SIZE, "%d\n", msc->wrap); 1783ba82664cSAlexander Shishkin } 1784ba82664cSAlexander Shishkin 1785ba82664cSAlexander Shishkin static ssize_t 1786ba82664cSAlexander Shishkin wrap_store(struct device *dev, struct device_attribute *attr, const char *buf, 1787ba82664cSAlexander Shishkin size_t size) 1788ba82664cSAlexander Shishkin { 1789ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1790ba82664cSAlexander Shishkin unsigned long val; 1791ba82664cSAlexander Shishkin int ret; 1792ba82664cSAlexander Shishkin 1793ba82664cSAlexander Shishkin ret = kstrtoul(buf, 10, &val); 1794ba82664cSAlexander Shishkin if (ret) 1795ba82664cSAlexander Shishkin return ret; 1796ba82664cSAlexander Shishkin 1797ba82664cSAlexander Shishkin msc->wrap = !!val; 1798ba82664cSAlexander Shishkin 1799ba82664cSAlexander Shishkin return size; 1800ba82664cSAlexander Shishkin } 1801ba82664cSAlexander Shishkin 1802ba82664cSAlexander Shishkin static DEVICE_ATTR_RW(wrap); 1803ba82664cSAlexander Shishkin 1804615c164dSAlexander Shishkin static void msc_buffer_unassign(struct msc *msc) 1805615c164dSAlexander Shishkin { 1806615c164dSAlexander Shishkin lockdep_assert_held(&msc->buf_mutex); 1807615c164dSAlexander Shishkin 1808615c164dSAlexander Shishkin if (!msc->mbuf) 1809615c164dSAlexander Shishkin return; 1810615c164dSAlexander Shishkin 1811615c164dSAlexander Shishkin msc->mbuf->unassign(msc->mbuf_priv); 1812615c164dSAlexander Shishkin msu_buffer_put(msc->mbuf); 1813615c164dSAlexander Shishkin msc->mbuf_priv = NULL; 1814615c164dSAlexander Shishkin msc->mbuf = NULL; 1815615c164dSAlexander Shishkin } 1816615c164dSAlexander Shishkin 1817ba82664cSAlexander Shishkin static ssize_t 1818ba82664cSAlexander Shishkin mode_show(struct device *dev, struct device_attribute *attr, char *buf) 1819ba82664cSAlexander Shishkin { 1820ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1821615c164dSAlexander Shishkin const char *mode = msc_mode[msc->mode]; 1822615c164dSAlexander Shishkin ssize_t ret; 1823ba82664cSAlexander Shishkin 1824615c164dSAlexander Shishkin mutex_lock(&msc->buf_mutex); 1825615c164dSAlexander Shishkin if (msc->mbuf) 1826615c164dSAlexander Shishkin mode = msc->mbuf->name; 1827615c164dSAlexander Shishkin ret = scnprintf(buf, PAGE_SIZE, "%s\n", mode); 1828615c164dSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 1829615c164dSAlexander Shishkin 1830615c164dSAlexander Shishkin return ret; 1831ba82664cSAlexander Shishkin } 1832ba82664cSAlexander Shishkin 1833ba82664cSAlexander Shishkin static ssize_t 1834ba82664cSAlexander Shishkin mode_store(struct device *dev, struct device_attribute *attr, const char *buf, 1835ba82664cSAlexander Shishkin size_t size) 1836ba82664cSAlexander Shishkin { 1837615c164dSAlexander Shishkin const struct msu_buffer *mbuf = NULL; 1838ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1839ba82664cSAlexander Shishkin size_t len = size; 1840615c164dSAlexander Shishkin char *cp, *mode; 1841ba82664cSAlexander Shishkin int i, ret; 1842ba82664cSAlexander Shishkin 1843ba82664cSAlexander Shishkin if (!capable(CAP_SYS_RAWIO)) 1844ba82664cSAlexander Shishkin return -EPERM; 1845ba82664cSAlexander Shishkin 1846ba82664cSAlexander Shishkin cp = memchr(buf, '\n', len); 1847ba82664cSAlexander Shishkin if (cp) 1848ba82664cSAlexander Shishkin len = cp - buf; 1849ba82664cSAlexander Shishkin 1850615c164dSAlexander Shishkin mode = kstrndup(buf, len, GFP_KERNEL); 1851063f097fSColin Ian King if (!mode) 1852063f097fSColin Ian King return -ENOMEM; 1853063f097fSColin Ian King 1854615c164dSAlexander Shishkin i = match_string(msc_mode, ARRAY_SIZE(msc_mode), mode); 1855615c164dSAlexander Shishkin if (i >= 0) 1856615c164dSAlexander Shishkin goto found; 1857615c164dSAlexander Shishkin 1858615c164dSAlexander Shishkin /* Buffer sinks only work with a usable IRQ */ 1859615c164dSAlexander Shishkin if (!msc->do_irq) { 1860615c164dSAlexander Shishkin kfree(mode); 1861615c164dSAlexander Shishkin return -EINVAL; 1862615c164dSAlexander Shishkin } 1863615c164dSAlexander Shishkin 1864615c164dSAlexander Shishkin mbuf = msu_buffer_get(mode); 1865615c164dSAlexander Shishkin kfree(mode); 1866615c164dSAlexander Shishkin if (mbuf) 1867ba82664cSAlexander Shishkin goto found; 1868ba82664cSAlexander Shishkin 1869ba82664cSAlexander Shishkin return -EINVAL; 1870ba82664cSAlexander Shishkin 1871ba82664cSAlexander Shishkin found: 1872ba82664cSAlexander Shishkin mutex_lock(&msc->buf_mutex); 1873615c164dSAlexander Shishkin ret = 0; 1874615c164dSAlexander Shishkin 1875615c164dSAlexander Shishkin /* Same buffer: do nothing */ 1876615c164dSAlexander Shishkin if (mbuf && mbuf == msc->mbuf) { 1877615c164dSAlexander Shishkin /* put the extra reference we just got */ 1878615c164dSAlexander Shishkin msu_buffer_put(mbuf); 1879615c164dSAlexander Shishkin goto unlock; 1880615c164dSAlexander Shishkin } 1881615c164dSAlexander Shishkin 1882ba82664cSAlexander Shishkin ret = msc_buffer_unlocked_free_unless_used(msc); 1883615c164dSAlexander Shishkin if (ret) 1884615c164dSAlexander Shishkin goto unlock; 1885615c164dSAlexander Shishkin 1886615c164dSAlexander Shishkin if (mbuf) { 1887615c164dSAlexander Shishkin void *mbuf_priv = mbuf->assign(dev, &i); 1888615c164dSAlexander Shishkin 1889615c164dSAlexander Shishkin if (!mbuf_priv) { 1890615c164dSAlexander Shishkin ret = -ENOMEM; 1891615c164dSAlexander Shishkin goto unlock; 1892615c164dSAlexander Shishkin } 1893615c164dSAlexander Shishkin 1894615c164dSAlexander Shishkin msc_buffer_unassign(msc); 1895615c164dSAlexander Shishkin msc->mbuf_priv = mbuf_priv; 1896615c164dSAlexander Shishkin msc->mbuf = mbuf; 1897615c164dSAlexander Shishkin } else { 1898615c164dSAlexander Shishkin msc_buffer_unassign(msc); 1899615c164dSAlexander Shishkin } 1900615c164dSAlexander Shishkin 1901ba82664cSAlexander Shishkin msc->mode = i; 1902615c164dSAlexander Shishkin 1903615c164dSAlexander Shishkin unlock: 1904615c164dSAlexander Shishkin if (ret && mbuf) 1905615c164dSAlexander Shishkin msu_buffer_put(mbuf); 1906ba82664cSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 1907ba82664cSAlexander Shishkin 1908ba82664cSAlexander Shishkin return ret ? ret : size; 1909ba82664cSAlexander Shishkin } 1910ba82664cSAlexander Shishkin 1911ba82664cSAlexander Shishkin static DEVICE_ATTR_RW(mode); 1912ba82664cSAlexander Shishkin 1913ba82664cSAlexander Shishkin static ssize_t 1914ba82664cSAlexander Shishkin nr_pages_show(struct device *dev, struct device_attribute *attr, char *buf) 1915ba82664cSAlexander Shishkin { 1916ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1917ba82664cSAlexander Shishkin struct msc_window *win; 1918ba82664cSAlexander Shishkin size_t count = 0; 1919ba82664cSAlexander Shishkin 1920ba82664cSAlexander Shishkin mutex_lock(&msc->buf_mutex); 1921ba82664cSAlexander Shishkin 1922ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) 1923ba82664cSAlexander Shishkin count = scnprintf(buf, PAGE_SIZE, "%ld\n", msc->nr_pages); 1924ba82664cSAlexander Shishkin else if (msc->mode == MSC_MODE_MULTI) { 1925ba82664cSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) { 1926ba82664cSAlexander Shishkin count += scnprintf(buf + count, PAGE_SIZE - count, 1927ba82664cSAlexander Shishkin "%d%c", win->nr_blocks, 1928ba82664cSAlexander Shishkin msc_is_last_win(win) ? '\n' : ','); 1929ba82664cSAlexander Shishkin } 1930ba82664cSAlexander Shishkin } else { 1931ba82664cSAlexander Shishkin count = scnprintf(buf, PAGE_SIZE, "unsupported\n"); 1932ba82664cSAlexander Shishkin } 1933ba82664cSAlexander Shishkin 1934ba82664cSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 1935ba82664cSAlexander Shishkin 1936ba82664cSAlexander Shishkin return count; 1937ba82664cSAlexander Shishkin } 1938ba82664cSAlexander Shishkin 1939ba82664cSAlexander Shishkin static ssize_t 1940ba82664cSAlexander Shishkin nr_pages_store(struct device *dev, struct device_attribute *attr, 1941ba82664cSAlexander Shishkin const char *buf, size_t size) 1942ba82664cSAlexander Shishkin { 1943ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1944ba82664cSAlexander Shishkin unsigned long val, *win = NULL, *rewin; 1945ba82664cSAlexander Shishkin size_t len = size; 1946ba82664cSAlexander Shishkin const char *p = buf; 1947ba82664cSAlexander Shishkin char *end, *s; 1948ba82664cSAlexander Shishkin int ret, nr_wins = 0; 1949ba82664cSAlexander Shishkin 1950ba82664cSAlexander Shishkin if (!capable(CAP_SYS_RAWIO)) 1951ba82664cSAlexander Shishkin return -EPERM; 1952ba82664cSAlexander Shishkin 1953ba82664cSAlexander Shishkin ret = msc_buffer_free_unless_used(msc); 1954ba82664cSAlexander Shishkin if (ret) 1955ba82664cSAlexander Shishkin return ret; 1956ba82664cSAlexander Shishkin 1957ba82664cSAlexander Shishkin /* scan the comma-separated list of allocation sizes */ 1958ba82664cSAlexander Shishkin end = memchr(buf, '\n', len); 1959ba82664cSAlexander Shishkin if (end) 1960ba82664cSAlexander Shishkin len = end - buf; 1961ba82664cSAlexander Shishkin 1962ba82664cSAlexander Shishkin do { 1963ba82664cSAlexander Shishkin end = memchr(p, ',', len); 1964ba82664cSAlexander Shishkin s = kstrndup(p, end ? end - p : len, GFP_KERNEL); 19656575cbd6SAlexander Shishkin if (!s) { 19666575cbd6SAlexander Shishkin ret = -ENOMEM; 19676575cbd6SAlexander Shishkin goto free_win; 19686575cbd6SAlexander Shishkin } 19696575cbd6SAlexander Shishkin 1970ba82664cSAlexander Shishkin ret = kstrtoul(s, 10, &val); 1971ba82664cSAlexander Shishkin kfree(s); 1972ba82664cSAlexander Shishkin 1973ba82664cSAlexander Shishkin if (ret || !val) 1974ba82664cSAlexander Shishkin goto free_win; 1975ba82664cSAlexander Shishkin 1976ba82664cSAlexander Shishkin if (nr_wins && msc->mode == MSC_MODE_SINGLE) { 1977ba82664cSAlexander Shishkin ret = -EINVAL; 1978ba82664cSAlexander Shishkin goto free_win; 1979ba82664cSAlexander Shishkin } 1980ba82664cSAlexander Shishkin 1981ba82664cSAlexander Shishkin nr_wins++; 1982ba82664cSAlexander Shishkin rewin = krealloc(win, sizeof(*win) * nr_wins, GFP_KERNEL); 1983ba82664cSAlexander Shishkin if (!rewin) { 1984ba82664cSAlexander Shishkin kfree(win); 1985ba82664cSAlexander Shishkin return -ENOMEM; 1986ba82664cSAlexander Shishkin } 1987ba82664cSAlexander Shishkin 1988ba82664cSAlexander Shishkin win = rewin; 1989ba82664cSAlexander Shishkin win[nr_wins - 1] = val; 1990ba82664cSAlexander Shishkin 1991ba82664cSAlexander Shishkin if (!end) 1992ba82664cSAlexander Shishkin break; 1993ba82664cSAlexander Shishkin 1994ec5b5ad6SAlexander Shishkin /* consume the number and the following comma, hence +1 */ 1995ec5b5ad6SAlexander Shishkin len -= end - p + 1; 1996ba82664cSAlexander Shishkin p = end + 1; 1997ba82664cSAlexander Shishkin } while (len); 1998ba82664cSAlexander Shishkin 1999ba82664cSAlexander Shishkin mutex_lock(&msc->buf_mutex); 2000ba82664cSAlexander Shishkin ret = msc_buffer_alloc(msc, win, nr_wins); 2001ba82664cSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 2002ba82664cSAlexander Shishkin 2003ba82664cSAlexander Shishkin free_win: 2004ba82664cSAlexander Shishkin kfree(win); 2005ba82664cSAlexander Shishkin 2006ba82664cSAlexander Shishkin return ret ? ret : size; 2007ba82664cSAlexander Shishkin } 2008ba82664cSAlexander Shishkin 2009ba82664cSAlexander Shishkin static DEVICE_ATTR_RW(nr_pages); 2010ba82664cSAlexander Shishkin 20116cac7866SAlexander Shishkin static ssize_t 20126cac7866SAlexander Shishkin win_switch_store(struct device *dev, struct device_attribute *attr, 20136cac7866SAlexander Shishkin const char *buf, size_t size) 20146cac7866SAlexander Shishkin { 20156cac7866SAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 20166cac7866SAlexander Shishkin unsigned long val; 20176cac7866SAlexander Shishkin int ret; 20186cac7866SAlexander Shishkin 20196cac7866SAlexander Shishkin ret = kstrtoul(buf, 10, &val); 20206cac7866SAlexander Shishkin if (ret) 20216cac7866SAlexander Shishkin return ret; 20226cac7866SAlexander Shishkin 20236cac7866SAlexander Shishkin if (val != 1) 20246cac7866SAlexander Shishkin return -EINVAL; 20256cac7866SAlexander Shishkin 20266cac7866SAlexander Shishkin mutex_lock(&msc->buf_mutex); 2027615c164dSAlexander Shishkin /* 2028615c164dSAlexander Shishkin * Window switch can only happen in the "multi" mode. 2029615c164dSAlexander Shishkin * If a external buffer is engaged, they have the full 2030615c164dSAlexander Shishkin * control over window switching. 2031615c164dSAlexander Shishkin */ 2032615c164dSAlexander Shishkin if (msc->mode != MSC_MODE_MULTI || msc->mbuf) 20336cac7866SAlexander Shishkin ret = -ENOTSUPP; 20346cac7866SAlexander Shishkin else 2035aad14ad3SAlexander Shishkin msc_win_switch(msc); 20366cac7866SAlexander Shishkin mutex_unlock(&msc->buf_mutex); 20376cac7866SAlexander Shishkin 20386cac7866SAlexander Shishkin return ret ? ret : size; 20396cac7866SAlexander Shishkin } 20406cac7866SAlexander Shishkin 20416cac7866SAlexander Shishkin static DEVICE_ATTR_WO(win_switch); 20426cac7866SAlexander Shishkin 2043ba82664cSAlexander Shishkin static struct attribute *msc_output_attrs[] = { 2044ba82664cSAlexander Shishkin &dev_attr_wrap.attr, 2045ba82664cSAlexander Shishkin &dev_attr_mode.attr, 2046ba82664cSAlexander Shishkin &dev_attr_nr_pages.attr, 20476cac7866SAlexander Shishkin &dev_attr_win_switch.attr, 2048ba82664cSAlexander Shishkin NULL, 2049ba82664cSAlexander Shishkin }; 2050ba82664cSAlexander Shishkin 2051ba82664cSAlexander Shishkin static struct attribute_group msc_output_group = { 2052ba82664cSAlexander Shishkin .attrs = msc_output_attrs, 2053ba82664cSAlexander Shishkin }; 2054ba82664cSAlexander Shishkin 2055ba82664cSAlexander Shishkin static int intel_th_msc_probe(struct intel_th_device *thdev) 2056ba82664cSAlexander Shishkin { 2057ba82664cSAlexander Shishkin struct device *dev = &thdev->dev; 2058ba82664cSAlexander Shishkin struct resource *res; 2059ba82664cSAlexander Shishkin struct msc *msc; 2060ba82664cSAlexander Shishkin void __iomem *base; 2061ba82664cSAlexander Shishkin int err; 2062ba82664cSAlexander Shishkin 2063ba82664cSAlexander Shishkin res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 0); 2064ba82664cSAlexander Shishkin if (!res) 2065ba82664cSAlexander Shishkin return -ENODEV; 2066ba82664cSAlexander Shishkin 2067ba82664cSAlexander Shishkin base = devm_ioremap(dev, res->start, resource_size(res)); 206873061da0SDan Carpenter if (!base) 206973061da0SDan Carpenter return -ENOMEM; 2070ba82664cSAlexander Shishkin 2071ba82664cSAlexander Shishkin msc = devm_kzalloc(dev, sizeof(*msc), GFP_KERNEL); 2072ba82664cSAlexander Shishkin if (!msc) 2073ba82664cSAlexander Shishkin return -ENOMEM; 2074ba82664cSAlexander Shishkin 2075aac8da65SAlexander Shishkin res = intel_th_device_get_resource(thdev, IORESOURCE_IRQ, 1); 2076aac8da65SAlexander Shishkin if (!res) 2077aac8da65SAlexander Shishkin msc->do_irq = 1; 2078aac8da65SAlexander Shishkin 2079ba82664cSAlexander Shishkin msc->index = thdev->id; 2080ba82664cSAlexander Shishkin 2081ba82664cSAlexander Shishkin msc->thdev = thdev; 2082ba82664cSAlexander Shishkin msc->reg_base = base + msc->index * 0x100; 2083aac8da65SAlexander Shishkin msc->msu_base = base; 2084aac8da65SAlexander Shishkin 2085615c164dSAlexander Shishkin INIT_WORK(&msc->work, msc_work); 2086ba82664cSAlexander Shishkin err = intel_th_msc_init(msc); 2087ba82664cSAlexander Shishkin if (err) 2088ba82664cSAlexander Shishkin return err; 2089ba82664cSAlexander Shishkin 2090ba82664cSAlexander Shishkin dev_set_drvdata(dev, msc); 2091ba82664cSAlexander Shishkin 2092ba82664cSAlexander Shishkin return 0; 2093ba82664cSAlexander Shishkin } 2094ba82664cSAlexander Shishkin 2095ba82664cSAlexander Shishkin static void intel_th_msc_remove(struct intel_th_device *thdev) 2096ba82664cSAlexander Shishkin { 2097f152dfeeSAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 2098f152dfeeSAlexander Shishkin int ret; 2099f152dfeeSAlexander Shishkin 2100f152dfeeSAlexander Shishkin intel_th_msc_deactivate(thdev); 2101f152dfeeSAlexander Shishkin 2102f152dfeeSAlexander Shishkin /* 2103f152dfeeSAlexander Shishkin * Buffers should not be used at this point except if the 2104f152dfeeSAlexander Shishkin * output character device is still open and the parent 2105f152dfeeSAlexander Shishkin * device gets detached from its bus, which is a FIXME. 2106f152dfeeSAlexander Shishkin */ 2107f152dfeeSAlexander Shishkin ret = msc_buffer_free_unless_used(msc); 2108f152dfeeSAlexander Shishkin WARN_ON_ONCE(ret); 2109ba82664cSAlexander Shishkin } 2110ba82664cSAlexander Shishkin 2111ba82664cSAlexander Shishkin static struct intel_th_driver intel_th_msc_driver = { 2112ba82664cSAlexander Shishkin .probe = intel_th_msc_probe, 2113ba82664cSAlexander Shishkin .remove = intel_th_msc_remove, 2114aac8da65SAlexander Shishkin .irq = intel_th_msc_interrupt, 21158d415512SAlexander Shishkin .wait_empty = intel_th_msc_wait_empty, 2116ba82664cSAlexander Shishkin .activate = intel_th_msc_activate, 2117ba82664cSAlexander Shishkin .deactivate = intel_th_msc_deactivate, 2118ba82664cSAlexander Shishkin .fops = &intel_th_msc_fops, 21199d482aedSAlexander Shishkin .attr_group = &msc_output_group, 2120ba82664cSAlexander Shishkin .driver = { 2121ba82664cSAlexander Shishkin .name = "msc", 2122ba82664cSAlexander Shishkin .owner = THIS_MODULE, 2123ba82664cSAlexander Shishkin }, 2124ba82664cSAlexander Shishkin }; 2125ba82664cSAlexander Shishkin 2126ba82664cSAlexander Shishkin module_driver(intel_th_msc_driver, 2127ba82664cSAlexander Shishkin intel_th_driver_register, 2128ba82664cSAlexander Shishkin intel_th_driver_unregister); 2129ba82664cSAlexander Shishkin 2130ba82664cSAlexander Shishkin MODULE_LICENSE("GPL v2"); 2131ba82664cSAlexander Shishkin MODULE_DESCRIPTION("Intel(R) Trace Hub Memory Storage Unit driver"); 2132ba82664cSAlexander Shishkin MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>"); 2133