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> 20ba82664cSAlexander Shishkin #include <linux/dma-mapping.h> 21ba82664cSAlexander Shishkin 220c14dac9SLaura Abbott #ifdef CONFIG_X86 230c14dac9SLaura Abbott #include <asm/set_memory.h> 240c14dac9SLaura Abbott #endif 25ba82664cSAlexander Shishkin 26ba82664cSAlexander Shishkin #include "intel_th.h" 27ba82664cSAlexander Shishkin #include "msu.h" 28ba82664cSAlexander Shishkin 29ba82664cSAlexander Shishkin #define msc_dev(x) (&(x)->thdev->dev) 30ba82664cSAlexander Shishkin 31ba82664cSAlexander Shishkin /** 32ba82664cSAlexander Shishkin * struct msc_block - multiblock mode block descriptor 33ba82664cSAlexander Shishkin * @bdesc: pointer to hardware descriptor (beginning of the block) 34ba82664cSAlexander Shishkin * @addr: physical address of the block 35ba82664cSAlexander Shishkin */ 36ba82664cSAlexander Shishkin struct msc_block { 37ba82664cSAlexander Shishkin struct msc_block_desc *bdesc; 38ba82664cSAlexander Shishkin dma_addr_t addr; 39ba82664cSAlexander Shishkin }; 40ba82664cSAlexander Shishkin 41ba82664cSAlexander Shishkin /** 42ba82664cSAlexander Shishkin * struct msc_window - multiblock mode window descriptor 43ba82664cSAlexander Shishkin * @entry: window list linkage (msc::win_list) 44ba82664cSAlexander Shishkin * @pgoff: page offset into the buffer that this window starts at 45ba82664cSAlexander Shishkin * @nr_blocks: number of blocks (pages) in this window 46ba82664cSAlexander Shishkin * @block: array of block descriptors 47ba82664cSAlexander Shishkin */ 48ba82664cSAlexander Shishkin struct msc_window { 49ba82664cSAlexander Shishkin struct list_head entry; 50ba82664cSAlexander Shishkin unsigned long pgoff; 51ba82664cSAlexander Shishkin unsigned int nr_blocks; 52ba82664cSAlexander Shishkin struct msc *msc; 53ba82664cSAlexander Shishkin struct msc_block block[0]; 54ba82664cSAlexander Shishkin }; 55ba82664cSAlexander Shishkin 56ba82664cSAlexander Shishkin /** 57ba82664cSAlexander Shishkin * struct msc_iter - iterator for msc buffer 58ba82664cSAlexander Shishkin * @entry: msc::iter_list linkage 59ba82664cSAlexander Shishkin * @msc: pointer to the MSC device 60ba82664cSAlexander Shishkin * @start_win: oldest window 61ba82664cSAlexander Shishkin * @win: current window 62ba82664cSAlexander Shishkin * @offset: current logical offset into the buffer 63ba82664cSAlexander Shishkin * @start_block: oldest block in the window 64ba82664cSAlexander Shishkin * @block: block number in the window 65ba82664cSAlexander Shishkin * @block_off: offset into current block 66ba82664cSAlexander Shishkin * @wrap_count: block wrapping handling 67ba82664cSAlexander Shishkin * @eof: end of buffer reached 68ba82664cSAlexander Shishkin */ 69ba82664cSAlexander Shishkin struct msc_iter { 70ba82664cSAlexander Shishkin struct list_head entry; 71ba82664cSAlexander Shishkin struct msc *msc; 72ba82664cSAlexander Shishkin struct msc_window *start_win; 73ba82664cSAlexander Shishkin struct msc_window *win; 74ba82664cSAlexander Shishkin unsigned long offset; 75ba82664cSAlexander Shishkin int start_block; 76ba82664cSAlexander Shishkin int block; 77ba82664cSAlexander Shishkin unsigned int block_off; 78ba82664cSAlexander Shishkin unsigned int wrap_count; 79ba82664cSAlexander Shishkin unsigned int eof; 80ba82664cSAlexander Shishkin }; 81ba82664cSAlexander Shishkin 82ba82664cSAlexander Shishkin /** 83ba82664cSAlexander Shishkin * struct msc - MSC device representation 84ba82664cSAlexander Shishkin * @reg_base: register window base address 85ba82664cSAlexander Shishkin * @thdev: intel_th_device pointer 86ba82664cSAlexander Shishkin * @win_list: list of windows in multiblock mode 87ba82664cSAlexander Shishkin * @nr_pages: total number of pages allocated for this buffer 88ba82664cSAlexander Shishkin * @single_sz: amount of data in single mode 89ba82664cSAlexander Shishkin * @single_wrap: single mode wrap occurred 90ba82664cSAlexander Shishkin * @base: buffer's base pointer 91ba82664cSAlexander Shishkin * @base_addr: buffer's base address 92ba82664cSAlexander Shishkin * @user_count: number of users of the buffer 93ba82664cSAlexander Shishkin * @mmap_count: number of mappings 94ba82664cSAlexander Shishkin * @buf_mutex: mutex to serialize access to buffer-related bits 95ba82664cSAlexander Shishkin 96ba82664cSAlexander Shishkin * @enabled: MSC is enabled 97ba82664cSAlexander Shishkin * @wrap: wrapping is enabled 98ba82664cSAlexander Shishkin * @mode: MSC operating mode 99ba82664cSAlexander Shishkin * @burst_len: write burst length 100ba82664cSAlexander Shishkin * @index: number of this MSC in the MSU 101ba82664cSAlexander Shishkin */ 102ba82664cSAlexander Shishkin struct msc { 103ba82664cSAlexander Shishkin void __iomem *reg_base; 104ba82664cSAlexander Shishkin struct intel_th_device *thdev; 105ba82664cSAlexander Shishkin 106ba82664cSAlexander Shishkin struct list_head win_list; 107ba82664cSAlexander Shishkin unsigned long nr_pages; 108ba82664cSAlexander Shishkin unsigned long single_sz; 109ba82664cSAlexander Shishkin unsigned int single_wrap : 1; 110ba82664cSAlexander Shishkin void *base; 111ba82664cSAlexander Shishkin dma_addr_t base_addr; 112ba82664cSAlexander Shishkin 113ba82664cSAlexander Shishkin /* <0: no buffer, 0: no users, >0: active users */ 114ba82664cSAlexander Shishkin atomic_t user_count; 115ba82664cSAlexander Shishkin 116ba82664cSAlexander Shishkin atomic_t mmap_count; 117ba82664cSAlexander Shishkin struct mutex buf_mutex; 118ba82664cSAlexander Shishkin 119ba82664cSAlexander Shishkin struct list_head iter_list; 120ba82664cSAlexander Shishkin 121ba82664cSAlexander Shishkin /* config */ 122ba82664cSAlexander Shishkin unsigned int enabled : 1, 123ba82664cSAlexander Shishkin wrap : 1; 124ba82664cSAlexander Shishkin unsigned int mode; 125ba82664cSAlexander Shishkin unsigned int burst_len; 126ba82664cSAlexander Shishkin unsigned int index; 127ba82664cSAlexander Shishkin }; 128ba82664cSAlexander Shishkin 129ba82664cSAlexander Shishkin static inline bool msc_block_is_empty(struct msc_block_desc *bdesc) 130ba82664cSAlexander Shishkin { 131ba82664cSAlexander Shishkin /* header hasn't been written */ 132ba82664cSAlexander Shishkin if (!bdesc->valid_dw) 133ba82664cSAlexander Shishkin return true; 134ba82664cSAlexander Shishkin 135ba82664cSAlexander Shishkin /* valid_dw includes the header */ 136ba82664cSAlexander Shishkin if (!msc_data_sz(bdesc)) 137ba82664cSAlexander Shishkin return true; 138ba82664cSAlexander Shishkin 139ba82664cSAlexander Shishkin return false; 140ba82664cSAlexander Shishkin } 141ba82664cSAlexander Shishkin 142ba82664cSAlexander Shishkin /** 143ba82664cSAlexander Shishkin * msc_oldest_window() - locate the window with oldest data 144ba82664cSAlexander Shishkin * @msc: MSC device 145ba82664cSAlexander Shishkin * 146ba82664cSAlexander Shishkin * This should only be used in multiblock mode. Caller should hold the 147ba82664cSAlexander Shishkin * msc::user_count reference. 148ba82664cSAlexander Shishkin * 149ba82664cSAlexander Shishkin * Return: the oldest window with valid data 150ba82664cSAlexander Shishkin */ 151ba82664cSAlexander Shishkin static struct msc_window *msc_oldest_window(struct msc *msc) 152ba82664cSAlexander Shishkin { 153ba82664cSAlexander Shishkin struct msc_window *win; 154ba82664cSAlexander Shishkin u32 reg = ioread32(msc->reg_base + REG_MSU_MSC0NWSA); 155ba82664cSAlexander Shishkin unsigned long win_addr = (unsigned long)reg << PAGE_SHIFT; 156ba82664cSAlexander Shishkin unsigned int found = 0; 157ba82664cSAlexander Shishkin 158ba82664cSAlexander Shishkin if (list_empty(&msc->win_list)) 159ba82664cSAlexander Shishkin return NULL; 160ba82664cSAlexander Shishkin 161ba82664cSAlexander Shishkin /* 162ba82664cSAlexander Shishkin * we might need a radix tree for this, depending on how 163ba82664cSAlexander Shishkin * many windows a typical user would allocate; ideally it's 164ba82664cSAlexander Shishkin * something like 2, in which case we're good 165ba82664cSAlexander Shishkin */ 166ba82664cSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) { 167ba82664cSAlexander Shishkin if (win->block[0].addr == win_addr) 168ba82664cSAlexander Shishkin found++; 169ba82664cSAlexander Shishkin 170ba82664cSAlexander Shishkin /* skip the empty ones */ 171ba82664cSAlexander Shishkin if (msc_block_is_empty(win->block[0].bdesc)) 172ba82664cSAlexander Shishkin continue; 173ba82664cSAlexander Shishkin 174ba82664cSAlexander Shishkin if (found) 175ba82664cSAlexander Shishkin return win; 176ba82664cSAlexander Shishkin } 177ba82664cSAlexander Shishkin 178ba82664cSAlexander Shishkin return list_entry(msc->win_list.next, struct msc_window, entry); 179ba82664cSAlexander Shishkin } 180ba82664cSAlexander Shishkin 181ba82664cSAlexander Shishkin /** 182ba82664cSAlexander Shishkin * msc_win_oldest_block() - locate the oldest block in a given window 183ba82664cSAlexander Shishkin * @win: window to look at 184ba82664cSAlexander Shishkin * 185ba82664cSAlexander Shishkin * Return: index of the block with the oldest data 186ba82664cSAlexander Shishkin */ 187ba82664cSAlexander Shishkin static unsigned int msc_win_oldest_block(struct msc_window *win) 188ba82664cSAlexander Shishkin { 189ba82664cSAlexander Shishkin unsigned int blk; 190ba82664cSAlexander Shishkin struct msc_block_desc *bdesc = win->block[0].bdesc; 191ba82664cSAlexander Shishkin 192ba82664cSAlexander Shishkin /* without wrapping, first block is the oldest */ 193ba82664cSAlexander Shishkin if (!msc_block_wrapped(bdesc)) 194ba82664cSAlexander Shishkin return 0; 195ba82664cSAlexander Shishkin 196ba82664cSAlexander Shishkin /* 197ba82664cSAlexander Shishkin * with wrapping, last written block contains both the newest and the 198ba82664cSAlexander Shishkin * oldest data for this window. 199ba82664cSAlexander Shishkin */ 200ba82664cSAlexander Shishkin for (blk = 0; blk < win->nr_blocks; blk++) { 201ba82664cSAlexander Shishkin bdesc = win->block[blk].bdesc; 202ba82664cSAlexander Shishkin 203ba82664cSAlexander Shishkin if (msc_block_last_written(bdesc)) 204ba82664cSAlexander Shishkin return blk; 205ba82664cSAlexander Shishkin } 206ba82664cSAlexander Shishkin 207ba82664cSAlexander Shishkin return 0; 208ba82664cSAlexander Shishkin } 209ba82664cSAlexander Shishkin 210ba82664cSAlexander Shishkin /** 211ba82664cSAlexander Shishkin * msc_is_last_win() - check if a window is the last one for a given MSC 212ba82664cSAlexander Shishkin * @win: window 213ba82664cSAlexander Shishkin * Return: true if @win is the last window in MSC's multiblock buffer 214ba82664cSAlexander Shishkin */ 215ba82664cSAlexander Shishkin static inline bool msc_is_last_win(struct msc_window *win) 216ba82664cSAlexander Shishkin { 217ba82664cSAlexander Shishkin return win->entry.next == &win->msc->win_list; 218ba82664cSAlexander Shishkin } 219ba82664cSAlexander Shishkin 220ba82664cSAlexander Shishkin /** 221ba82664cSAlexander Shishkin * msc_next_window() - return next window in the multiblock buffer 222ba82664cSAlexander Shishkin * @win: current window 223ba82664cSAlexander Shishkin * 224ba82664cSAlexander Shishkin * Return: window following the current one 225ba82664cSAlexander Shishkin */ 226ba82664cSAlexander Shishkin static struct msc_window *msc_next_window(struct msc_window *win) 227ba82664cSAlexander Shishkin { 228ba82664cSAlexander Shishkin if (msc_is_last_win(win)) 229ba82664cSAlexander Shishkin return list_entry(win->msc->win_list.next, struct msc_window, 230ba82664cSAlexander Shishkin entry); 231ba82664cSAlexander Shishkin 232ba82664cSAlexander Shishkin return list_entry(win->entry.next, struct msc_window, entry); 233ba82664cSAlexander Shishkin } 234ba82664cSAlexander Shishkin 235ba82664cSAlexander Shishkin static struct msc_block_desc *msc_iter_bdesc(struct msc_iter *iter) 236ba82664cSAlexander Shishkin { 237ba82664cSAlexander Shishkin return iter->win->block[iter->block].bdesc; 238ba82664cSAlexander Shishkin } 239ba82664cSAlexander Shishkin 240ba82664cSAlexander Shishkin static void msc_iter_init(struct msc_iter *iter) 241ba82664cSAlexander Shishkin { 242ba82664cSAlexander Shishkin memset(iter, 0, sizeof(*iter)); 243ba82664cSAlexander Shishkin iter->start_block = -1; 244ba82664cSAlexander Shishkin iter->block = -1; 245ba82664cSAlexander Shishkin } 246ba82664cSAlexander Shishkin 247ba82664cSAlexander Shishkin static struct msc_iter *msc_iter_install(struct msc *msc) 248ba82664cSAlexander Shishkin { 249ba82664cSAlexander Shishkin struct msc_iter *iter; 250ba82664cSAlexander Shishkin 251ba82664cSAlexander Shishkin iter = kzalloc(sizeof(*iter), GFP_KERNEL); 252ba82664cSAlexander Shishkin if (!iter) 253a45ff6edSAlexander Shishkin return ERR_PTR(-ENOMEM); 254a45ff6edSAlexander Shishkin 255a45ff6edSAlexander Shishkin mutex_lock(&msc->buf_mutex); 256a45ff6edSAlexander Shishkin 257a45ff6edSAlexander Shishkin /* 258a45ff6edSAlexander Shishkin * Reading and tracing are mutually exclusive; if msc is 259a45ff6edSAlexander Shishkin * enabled, open() will fail; otherwise existing readers 260a45ff6edSAlexander Shishkin * will prevent enabling the msc and the rest of fops don't 261a45ff6edSAlexander Shishkin * need to worry about it. 262a45ff6edSAlexander Shishkin */ 263a45ff6edSAlexander Shishkin if (msc->enabled) { 264a45ff6edSAlexander Shishkin kfree(iter); 265a45ff6edSAlexander Shishkin iter = ERR_PTR(-EBUSY); 266a45ff6edSAlexander Shishkin goto unlock; 267a45ff6edSAlexander Shishkin } 268ba82664cSAlexander Shishkin 269ba82664cSAlexander Shishkin msc_iter_init(iter); 270ba82664cSAlexander Shishkin iter->msc = msc; 271ba82664cSAlexander Shishkin 272ba82664cSAlexander Shishkin list_add_tail(&iter->entry, &msc->iter_list); 273a45ff6edSAlexander Shishkin unlock: 274a45ff6edSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 275ba82664cSAlexander Shishkin 276ba82664cSAlexander Shishkin return iter; 277ba82664cSAlexander Shishkin } 278ba82664cSAlexander Shishkin 279ba82664cSAlexander Shishkin static void msc_iter_remove(struct msc_iter *iter, struct msc *msc) 280ba82664cSAlexander Shishkin { 281a45ff6edSAlexander Shishkin mutex_lock(&msc->buf_mutex); 282ba82664cSAlexander Shishkin list_del(&iter->entry); 283a45ff6edSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 284ba82664cSAlexander Shishkin 285ba82664cSAlexander Shishkin kfree(iter); 286ba82664cSAlexander Shishkin } 287ba82664cSAlexander Shishkin 288ba82664cSAlexander Shishkin static void msc_iter_block_start(struct msc_iter *iter) 289ba82664cSAlexander Shishkin { 290ba82664cSAlexander Shishkin if (iter->start_block != -1) 291ba82664cSAlexander Shishkin return; 292ba82664cSAlexander Shishkin 293ba82664cSAlexander Shishkin iter->start_block = msc_win_oldest_block(iter->win); 294ba82664cSAlexander Shishkin iter->block = iter->start_block; 295ba82664cSAlexander Shishkin iter->wrap_count = 0; 296ba82664cSAlexander Shishkin 297ba82664cSAlexander Shishkin /* 298ba82664cSAlexander Shishkin * start with the block with oldest data; if data has wrapped 299ba82664cSAlexander Shishkin * in this window, it should be in this block 300ba82664cSAlexander Shishkin */ 301ba82664cSAlexander Shishkin if (msc_block_wrapped(msc_iter_bdesc(iter))) 302ba82664cSAlexander Shishkin iter->wrap_count = 2; 303ba82664cSAlexander Shishkin 304ba82664cSAlexander Shishkin } 305ba82664cSAlexander Shishkin 306ba82664cSAlexander Shishkin static int msc_iter_win_start(struct msc_iter *iter, struct msc *msc) 307ba82664cSAlexander Shishkin { 308ba82664cSAlexander Shishkin /* already started, nothing to do */ 309ba82664cSAlexander Shishkin if (iter->start_win) 310ba82664cSAlexander Shishkin return 0; 311ba82664cSAlexander Shishkin 312ba82664cSAlexander Shishkin iter->start_win = msc_oldest_window(msc); 313ba82664cSAlexander Shishkin if (!iter->start_win) 314ba82664cSAlexander Shishkin return -EINVAL; 315ba82664cSAlexander Shishkin 316ba82664cSAlexander Shishkin iter->win = iter->start_win; 317ba82664cSAlexander Shishkin iter->start_block = -1; 318ba82664cSAlexander Shishkin 319ba82664cSAlexander Shishkin msc_iter_block_start(iter); 320ba82664cSAlexander Shishkin 321ba82664cSAlexander Shishkin return 0; 322ba82664cSAlexander Shishkin } 323ba82664cSAlexander Shishkin 324ba82664cSAlexander Shishkin static int msc_iter_win_advance(struct msc_iter *iter) 325ba82664cSAlexander Shishkin { 326ba82664cSAlexander Shishkin iter->win = msc_next_window(iter->win); 327ba82664cSAlexander Shishkin iter->start_block = -1; 328ba82664cSAlexander Shishkin 329ba82664cSAlexander Shishkin if (iter->win == iter->start_win) { 330ba82664cSAlexander Shishkin iter->eof++; 331ba82664cSAlexander Shishkin return 1; 332ba82664cSAlexander Shishkin } 333ba82664cSAlexander Shishkin 334ba82664cSAlexander Shishkin msc_iter_block_start(iter); 335ba82664cSAlexander Shishkin 336ba82664cSAlexander Shishkin return 0; 337ba82664cSAlexander Shishkin } 338ba82664cSAlexander Shishkin 339ba82664cSAlexander Shishkin static int msc_iter_block_advance(struct msc_iter *iter) 340ba82664cSAlexander Shishkin { 341ba82664cSAlexander Shishkin iter->block_off = 0; 342ba82664cSAlexander Shishkin 343ba82664cSAlexander Shishkin /* wrapping */ 344ba82664cSAlexander Shishkin if (iter->wrap_count && iter->block == iter->start_block) { 345ba82664cSAlexander Shishkin iter->wrap_count--; 346ba82664cSAlexander Shishkin if (!iter->wrap_count) 347ba82664cSAlexander Shishkin /* copied newest data from the wrapped block */ 348ba82664cSAlexander Shishkin return msc_iter_win_advance(iter); 349ba82664cSAlexander Shishkin } 350ba82664cSAlexander Shishkin 351ba82664cSAlexander Shishkin /* no wrapping, check for last written block */ 352ba82664cSAlexander Shishkin if (!iter->wrap_count && msc_block_last_written(msc_iter_bdesc(iter))) 353ba82664cSAlexander Shishkin /* copied newest data for the window */ 354ba82664cSAlexander Shishkin return msc_iter_win_advance(iter); 355ba82664cSAlexander Shishkin 356ba82664cSAlexander Shishkin /* block advance */ 357ba82664cSAlexander Shishkin if (++iter->block == iter->win->nr_blocks) 358ba82664cSAlexander Shishkin iter->block = 0; 359ba82664cSAlexander Shishkin 360ba82664cSAlexander Shishkin /* no wrapping, sanity check in case there is no last written block */ 361ba82664cSAlexander Shishkin if (!iter->wrap_count && iter->block == iter->start_block) 362ba82664cSAlexander Shishkin return msc_iter_win_advance(iter); 363ba82664cSAlexander Shishkin 364ba82664cSAlexander Shishkin return 0; 365ba82664cSAlexander Shishkin } 366ba82664cSAlexander Shishkin 367ba82664cSAlexander Shishkin /** 368ba82664cSAlexander Shishkin * msc_buffer_iterate() - go through multiblock buffer's data 369ba82664cSAlexander Shishkin * @iter: iterator structure 370ba82664cSAlexander Shishkin * @size: amount of data to scan 371ba82664cSAlexander Shishkin * @data: callback's private data 372ba82664cSAlexander Shishkin * @fn: iterator callback 373ba82664cSAlexander Shishkin * 374ba82664cSAlexander Shishkin * This will start at the window which will be written to next (containing 375ba82664cSAlexander Shishkin * the oldest data) and work its way to the current window, calling @fn 376ba82664cSAlexander Shishkin * for each chunk of data as it goes. 377ba82664cSAlexander Shishkin * 378ba82664cSAlexander Shishkin * Caller should have msc::user_count reference to make sure the buffer 379ba82664cSAlexander Shishkin * doesn't disappear from under us. 380ba82664cSAlexander Shishkin * 381ba82664cSAlexander Shishkin * Return: amount of data actually scanned. 382ba82664cSAlexander Shishkin */ 383ba82664cSAlexander Shishkin static ssize_t 384ba82664cSAlexander Shishkin msc_buffer_iterate(struct msc_iter *iter, size_t size, void *data, 385ba82664cSAlexander Shishkin unsigned long (*fn)(void *, void *, size_t)) 386ba82664cSAlexander Shishkin { 387ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 388ba82664cSAlexander Shishkin size_t len = size; 389ba82664cSAlexander Shishkin unsigned int advance; 390ba82664cSAlexander Shishkin 391ba82664cSAlexander Shishkin if (iter->eof) 392ba82664cSAlexander Shishkin return 0; 393ba82664cSAlexander Shishkin 394ba82664cSAlexander Shishkin /* start with the oldest window */ 395ba82664cSAlexander Shishkin if (msc_iter_win_start(iter, msc)) 396ba82664cSAlexander Shishkin return 0; 397ba82664cSAlexander Shishkin 398ba82664cSAlexander Shishkin do { 399ba82664cSAlexander Shishkin unsigned long data_bytes = msc_data_sz(msc_iter_bdesc(iter)); 400ba82664cSAlexander Shishkin void *src = (void *)msc_iter_bdesc(iter) + MSC_BDESC; 401ba82664cSAlexander Shishkin size_t tocopy = data_bytes, copied = 0; 402ba82664cSAlexander Shishkin size_t remaining = 0; 403ba82664cSAlexander Shishkin 404ba82664cSAlexander Shishkin advance = 1; 405ba82664cSAlexander Shishkin 406ba82664cSAlexander Shishkin /* 407ba82664cSAlexander Shishkin * If block wrapping happened, we need to visit the last block 408ba82664cSAlexander Shishkin * twice, because it contains both the oldest and the newest 409ba82664cSAlexander Shishkin * data in this window. 410ba82664cSAlexander Shishkin * 411ba82664cSAlexander Shishkin * First time (wrap_count==2), in the very beginning, to collect 412ba82664cSAlexander Shishkin * the oldest data, which is in the range 413ba82664cSAlexander Shishkin * (data_bytes..DATA_IN_PAGE). 414ba82664cSAlexander Shishkin * 415ba82664cSAlexander Shishkin * Second time (wrap_count==1), it's just like any other block, 416ba82664cSAlexander Shishkin * containing data in the range of [MSC_BDESC..data_bytes]. 417ba82664cSAlexander Shishkin */ 418e4eca2a1SLaurent FERT if (iter->block == iter->start_block && iter->wrap_count == 2) { 419ba82664cSAlexander Shishkin tocopy = DATA_IN_PAGE - data_bytes; 420ba82664cSAlexander Shishkin src += data_bytes; 421ba82664cSAlexander Shishkin } 422ba82664cSAlexander Shishkin 423ba82664cSAlexander Shishkin if (!tocopy) 424ba82664cSAlexander Shishkin goto next_block; 425ba82664cSAlexander Shishkin 426ba82664cSAlexander Shishkin tocopy -= iter->block_off; 427ba82664cSAlexander Shishkin src += iter->block_off; 428ba82664cSAlexander Shishkin 429ba82664cSAlexander Shishkin if (len < tocopy) { 430ba82664cSAlexander Shishkin tocopy = len; 431ba82664cSAlexander Shishkin advance = 0; 432ba82664cSAlexander Shishkin } 433ba82664cSAlexander Shishkin 434ba82664cSAlexander Shishkin remaining = fn(data, src, tocopy); 435ba82664cSAlexander Shishkin 436ba82664cSAlexander Shishkin if (remaining) 437ba82664cSAlexander Shishkin advance = 0; 438ba82664cSAlexander Shishkin 439ba82664cSAlexander Shishkin copied = tocopy - remaining; 440ba82664cSAlexander Shishkin len -= copied; 441ba82664cSAlexander Shishkin iter->block_off += copied; 442ba82664cSAlexander Shishkin iter->offset += copied; 443ba82664cSAlexander Shishkin 444ba82664cSAlexander Shishkin if (!advance) 445ba82664cSAlexander Shishkin break; 446ba82664cSAlexander Shishkin 447ba82664cSAlexander Shishkin next_block: 448ba82664cSAlexander Shishkin if (msc_iter_block_advance(iter)) 449ba82664cSAlexander Shishkin break; 450ba82664cSAlexander Shishkin 451ba82664cSAlexander Shishkin } while (len); 452ba82664cSAlexander Shishkin 453ba82664cSAlexander Shishkin return size - len; 454ba82664cSAlexander Shishkin } 455ba82664cSAlexander Shishkin 456ba82664cSAlexander Shishkin /** 457ba82664cSAlexander Shishkin * msc_buffer_clear_hw_header() - clear hw header for multiblock 458ba82664cSAlexander Shishkin * @msc: MSC device 459ba82664cSAlexander Shishkin */ 460ba82664cSAlexander Shishkin static void msc_buffer_clear_hw_header(struct msc *msc) 461ba82664cSAlexander Shishkin { 462ba82664cSAlexander Shishkin struct msc_window *win; 463ba82664cSAlexander Shishkin 464ba82664cSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) { 465ba82664cSAlexander Shishkin unsigned int blk; 466ba82664cSAlexander Shishkin size_t hw_sz = sizeof(struct msc_block_desc) - 467ba82664cSAlexander Shishkin offsetof(struct msc_block_desc, hw_tag); 468ba82664cSAlexander Shishkin 469ba82664cSAlexander Shishkin for (blk = 0; blk < win->nr_blocks; blk++) { 470ba82664cSAlexander Shishkin struct msc_block_desc *bdesc = win->block[blk].bdesc; 471ba82664cSAlexander Shishkin 472ba82664cSAlexander Shishkin memset(&bdesc->hw_tag, 0, hw_sz); 473ba82664cSAlexander Shishkin } 474ba82664cSAlexander Shishkin } 475ba82664cSAlexander Shishkin } 476ba82664cSAlexander Shishkin 477ba82664cSAlexander Shishkin /** 478ba82664cSAlexander Shishkin * msc_configure() - set up MSC hardware 479ba82664cSAlexander Shishkin * @msc: the MSC device to configure 480ba82664cSAlexander Shishkin * 481ba82664cSAlexander Shishkin * Program storage mode, wrapping, burst length and trace buffer address 482a45ff6edSAlexander Shishkin * into a given MSC. Then, enable tracing and set msc::enabled. 483a45ff6edSAlexander Shishkin * The latter is serialized on msc::buf_mutex, so make sure to hold it. 484ba82664cSAlexander Shishkin */ 485ba82664cSAlexander Shishkin static int msc_configure(struct msc *msc) 486ba82664cSAlexander Shishkin { 487ba82664cSAlexander Shishkin u32 reg; 488ba82664cSAlexander Shishkin 489a45ff6edSAlexander Shishkin lockdep_assert_held(&msc->buf_mutex); 490a45ff6edSAlexander Shishkin 491ba82664cSAlexander Shishkin if (msc->mode > MSC_MODE_MULTI) 492ba82664cSAlexander Shishkin return -ENOTSUPP; 493ba82664cSAlexander Shishkin 494ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_MULTI) 495ba82664cSAlexander Shishkin msc_buffer_clear_hw_header(msc); 496ba82664cSAlexander Shishkin 497ba82664cSAlexander Shishkin reg = msc->base_addr >> PAGE_SHIFT; 498ba82664cSAlexander Shishkin iowrite32(reg, msc->reg_base + REG_MSU_MSC0BAR); 499ba82664cSAlexander Shishkin 500ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) { 501ba82664cSAlexander Shishkin reg = msc->nr_pages; 502ba82664cSAlexander Shishkin iowrite32(reg, msc->reg_base + REG_MSU_MSC0SIZE); 503ba82664cSAlexander Shishkin } 504ba82664cSAlexander Shishkin 505ba82664cSAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSC0CTL); 506ba82664cSAlexander Shishkin reg &= ~(MSC_MODE | MSC_WRAPEN | MSC_EN | MSC_RD_HDR_OVRD); 507ba82664cSAlexander Shishkin 508a45ff6edSAlexander Shishkin reg |= MSC_EN; 509ba82664cSAlexander Shishkin reg |= msc->mode << __ffs(MSC_MODE); 510ba82664cSAlexander Shishkin reg |= msc->burst_len << __ffs(MSC_LEN); 511a45ff6edSAlexander Shishkin 512ba82664cSAlexander Shishkin if (msc->wrap) 513ba82664cSAlexander Shishkin reg |= MSC_WRAPEN; 514ba82664cSAlexander Shishkin 515ba82664cSAlexander Shishkin iowrite32(reg, msc->reg_base + REG_MSU_MSC0CTL); 516ba82664cSAlexander Shishkin 517ba82664cSAlexander Shishkin msc->thdev->output.multiblock = msc->mode == MSC_MODE_MULTI; 518ba82664cSAlexander Shishkin intel_th_trace_enable(msc->thdev); 519a45ff6edSAlexander Shishkin msc->enabled = 1; 520a45ff6edSAlexander Shishkin 521ba82664cSAlexander Shishkin 522ba82664cSAlexander Shishkin return 0; 523ba82664cSAlexander Shishkin } 524ba82664cSAlexander Shishkin 525ba82664cSAlexander Shishkin /** 526ba82664cSAlexander Shishkin * msc_disable() - disable MSC hardware 527ba82664cSAlexander Shishkin * @msc: MSC device to disable 528ba82664cSAlexander Shishkin * 529ba82664cSAlexander Shishkin * If @msc is enabled, disable tracing on the switch and then disable MSC 530a45ff6edSAlexander Shishkin * storage. Caller must hold msc::buf_mutex. 531ba82664cSAlexander Shishkin */ 532ba82664cSAlexander Shishkin static void msc_disable(struct msc *msc) 533ba82664cSAlexander Shishkin { 534ba82664cSAlexander Shishkin unsigned long count; 535ba82664cSAlexander Shishkin u32 reg; 536ba82664cSAlexander Shishkin 537a45ff6edSAlexander Shishkin lockdep_assert_held(&msc->buf_mutex); 538ba82664cSAlexander Shishkin 539ba82664cSAlexander Shishkin intel_th_trace_disable(msc->thdev); 540ba82664cSAlexander Shishkin 541ba82664cSAlexander Shishkin for (reg = 0, count = MSC_PLE_WAITLOOP_DEPTH; 542ba82664cSAlexander Shishkin count && !(reg & MSCSTS_PLE); count--) { 543ba82664cSAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSC0STS); 544ba82664cSAlexander Shishkin cpu_relax(); 545ba82664cSAlexander Shishkin } 546ba82664cSAlexander Shishkin 547ba82664cSAlexander Shishkin if (!count) 548ba82664cSAlexander Shishkin dev_dbg(msc_dev(msc), "timeout waiting for MSC0 PLE\n"); 549ba82664cSAlexander Shishkin 550ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) { 551ba82664cSAlexander Shishkin msc->single_wrap = !!(reg & MSCSTS_WRAPSTAT); 552ba82664cSAlexander Shishkin 553ba82664cSAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSC0MWP); 554ba82664cSAlexander Shishkin msc->single_sz = reg & ((msc->nr_pages << PAGE_SHIFT) - 1); 555ba82664cSAlexander Shishkin dev_dbg(msc_dev(msc), "MSCnMWP: %08x/%08lx, wrap: %d\n", 556ba82664cSAlexander Shishkin reg, msc->single_sz, msc->single_wrap); 557ba82664cSAlexander Shishkin } 558ba82664cSAlexander Shishkin 559ba82664cSAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSC0CTL); 560ba82664cSAlexander Shishkin reg &= ~MSC_EN; 561ba82664cSAlexander Shishkin iowrite32(reg, msc->reg_base + REG_MSU_MSC0CTL); 562ba82664cSAlexander Shishkin msc->enabled = 0; 563ba82664cSAlexander Shishkin 564ba82664cSAlexander Shishkin iowrite32(0, msc->reg_base + REG_MSU_MSC0BAR); 565ba82664cSAlexander Shishkin iowrite32(0, msc->reg_base + REG_MSU_MSC0SIZE); 566ba82664cSAlexander Shishkin 567ba82664cSAlexander Shishkin dev_dbg(msc_dev(msc), "MSCnNWSA: %08x\n", 568ba82664cSAlexander Shishkin ioread32(msc->reg_base + REG_MSU_MSC0NWSA)); 569ba82664cSAlexander Shishkin 570ba82664cSAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSC0STS); 571ba82664cSAlexander Shishkin dev_dbg(msc_dev(msc), "MSCnSTS: %08x\n", reg); 572ba82664cSAlexander Shishkin } 573ba82664cSAlexander Shishkin 574ba82664cSAlexander Shishkin static int intel_th_msc_activate(struct intel_th_device *thdev) 575ba82664cSAlexander Shishkin { 576ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 577a45ff6edSAlexander Shishkin int ret = -EBUSY; 578ba82664cSAlexander Shishkin 579ba82664cSAlexander Shishkin if (!atomic_inc_unless_negative(&msc->user_count)) 580ba82664cSAlexander Shishkin return -ENODEV; 581ba82664cSAlexander Shishkin 582a45ff6edSAlexander Shishkin mutex_lock(&msc->buf_mutex); 583ba82664cSAlexander Shishkin 584a45ff6edSAlexander Shishkin /* if there are readers, refuse */ 585a45ff6edSAlexander Shishkin if (list_empty(&msc->iter_list)) 586a45ff6edSAlexander Shishkin ret = msc_configure(msc); 587a45ff6edSAlexander Shishkin 588a45ff6edSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 589a45ff6edSAlexander Shishkin 590a45ff6edSAlexander Shishkin if (ret) 591ba82664cSAlexander Shishkin atomic_dec(&msc->user_count); 592a45ff6edSAlexander Shishkin 593ba82664cSAlexander Shishkin return ret; 594ba82664cSAlexander Shishkin } 595ba82664cSAlexander Shishkin 596ba82664cSAlexander Shishkin static void intel_th_msc_deactivate(struct intel_th_device *thdev) 597ba82664cSAlexander Shishkin { 598ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 599ba82664cSAlexander Shishkin 600a45ff6edSAlexander Shishkin mutex_lock(&msc->buf_mutex); 601a45ff6edSAlexander Shishkin if (msc->enabled) { 602ba82664cSAlexander Shishkin msc_disable(msc); 603ba82664cSAlexander Shishkin atomic_dec(&msc->user_count); 604ba82664cSAlexander Shishkin } 605a45ff6edSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 606a45ff6edSAlexander Shishkin } 607ba82664cSAlexander Shishkin 608ba82664cSAlexander Shishkin /** 609ba82664cSAlexander Shishkin * msc_buffer_contig_alloc() - allocate a contiguous buffer for SINGLE mode 610ba82664cSAlexander Shishkin * @msc: MSC device 611ba82664cSAlexander Shishkin * @size: allocation size in bytes 612ba82664cSAlexander Shishkin * 613ba82664cSAlexander Shishkin * This modifies msc::base, which requires msc::buf_mutex to serialize, so the 614ba82664cSAlexander Shishkin * caller is expected to hold it. 615ba82664cSAlexander Shishkin * 616ba82664cSAlexander Shishkin * Return: 0 on success, -errno otherwise. 617ba82664cSAlexander Shishkin */ 618ba82664cSAlexander Shishkin static int msc_buffer_contig_alloc(struct msc *msc, unsigned long size) 619ba82664cSAlexander Shishkin { 620ba82664cSAlexander Shishkin unsigned int order = get_order(size); 621ba82664cSAlexander Shishkin struct page *page; 622ba82664cSAlexander Shishkin 623ba82664cSAlexander Shishkin if (!size) 624ba82664cSAlexander Shishkin return 0; 625ba82664cSAlexander Shishkin 626ba82664cSAlexander Shishkin page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order); 627ba82664cSAlexander Shishkin if (!page) 628ba82664cSAlexander Shishkin return -ENOMEM; 629ba82664cSAlexander Shishkin 630ba82664cSAlexander Shishkin split_page(page, order); 631ba82664cSAlexander Shishkin msc->nr_pages = size >> PAGE_SHIFT; 632ba82664cSAlexander Shishkin msc->base = page_address(page); 633ba82664cSAlexander Shishkin msc->base_addr = page_to_phys(page); 634ba82664cSAlexander Shishkin 635ba82664cSAlexander Shishkin return 0; 636ba82664cSAlexander Shishkin } 637ba82664cSAlexander Shishkin 638ba82664cSAlexander Shishkin /** 639ba82664cSAlexander Shishkin * msc_buffer_contig_free() - free a contiguous buffer 640ba82664cSAlexander Shishkin * @msc: MSC configured in SINGLE mode 641ba82664cSAlexander Shishkin */ 642ba82664cSAlexander Shishkin static void msc_buffer_contig_free(struct msc *msc) 643ba82664cSAlexander Shishkin { 644ba82664cSAlexander Shishkin unsigned long off; 645ba82664cSAlexander Shishkin 646ba82664cSAlexander Shishkin for (off = 0; off < msc->nr_pages << PAGE_SHIFT; off += PAGE_SIZE) { 647ba82664cSAlexander Shishkin struct page *page = virt_to_page(msc->base + off); 648ba82664cSAlexander Shishkin 649ba82664cSAlexander Shishkin page->mapping = NULL; 650ba82664cSAlexander Shishkin __free_page(page); 651ba82664cSAlexander Shishkin } 652ba82664cSAlexander Shishkin 653ba82664cSAlexander Shishkin msc->nr_pages = 0; 654ba82664cSAlexander Shishkin } 655ba82664cSAlexander Shishkin 656ba82664cSAlexander Shishkin /** 657ba82664cSAlexander Shishkin * msc_buffer_contig_get_page() - find a page at a given offset 658ba82664cSAlexander Shishkin * @msc: MSC configured in SINGLE mode 659ba82664cSAlexander Shishkin * @pgoff: page offset 660ba82664cSAlexander Shishkin * 661ba82664cSAlexander Shishkin * Return: page, if @pgoff is within the range, NULL otherwise. 662ba82664cSAlexander Shishkin */ 663ba82664cSAlexander Shishkin static struct page *msc_buffer_contig_get_page(struct msc *msc, 664ba82664cSAlexander Shishkin unsigned long pgoff) 665ba82664cSAlexander Shishkin { 666ba82664cSAlexander Shishkin if (pgoff >= msc->nr_pages) 667ba82664cSAlexander Shishkin return NULL; 668ba82664cSAlexander Shishkin 669ba82664cSAlexander Shishkin return virt_to_page(msc->base + (pgoff << PAGE_SHIFT)); 670ba82664cSAlexander Shishkin } 671ba82664cSAlexander Shishkin 672ba82664cSAlexander Shishkin /** 673ba82664cSAlexander Shishkin * msc_buffer_win_alloc() - alloc a window for a multiblock mode 674ba82664cSAlexander Shishkin * @msc: MSC device 675ba82664cSAlexander Shishkin * @nr_blocks: number of pages in this window 676ba82664cSAlexander Shishkin * 677ba82664cSAlexander Shishkin * This modifies msc::win_list and msc::base, which requires msc::buf_mutex 678ba82664cSAlexander Shishkin * to serialize, so the caller is expected to hold it. 679ba82664cSAlexander Shishkin * 680ba82664cSAlexander Shishkin * Return: 0 on success, -errno otherwise. 681ba82664cSAlexander Shishkin */ 682ba82664cSAlexander Shishkin static int msc_buffer_win_alloc(struct msc *msc, unsigned int nr_blocks) 683ba82664cSAlexander Shishkin { 684ba82664cSAlexander Shishkin struct msc_window *win; 685ba82664cSAlexander Shishkin unsigned long size = PAGE_SIZE; 686ba82664cSAlexander Shishkin int i, ret = -ENOMEM; 687ba82664cSAlexander Shishkin 688ba82664cSAlexander Shishkin if (!nr_blocks) 689ba82664cSAlexander Shishkin return 0; 690ba82664cSAlexander Shishkin 691ba82664cSAlexander Shishkin win = kzalloc(offsetof(struct msc_window, block[nr_blocks]), 692ba82664cSAlexander Shishkin GFP_KERNEL); 693ba82664cSAlexander Shishkin if (!win) 694ba82664cSAlexander Shishkin return -ENOMEM; 695ba82664cSAlexander Shishkin 696ba82664cSAlexander Shishkin if (!list_empty(&msc->win_list)) { 697ba82664cSAlexander Shishkin struct msc_window *prev = list_entry(msc->win_list.prev, 698ba82664cSAlexander Shishkin struct msc_window, entry); 699ba82664cSAlexander Shishkin 700ba82664cSAlexander Shishkin win->pgoff = prev->pgoff + prev->nr_blocks; 701ba82664cSAlexander Shishkin } 702ba82664cSAlexander Shishkin 703ba82664cSAlexander Shishkin for (i = 0; i < nr_blocks; i++) { 704d5c435dfSAlexander Shishkin win->block[i].bdesc = 705d5c435dfSAlexander Shishkin dma_alloc_coherent(msc_dev(msc)->parent->parent, size, 706d5c435dfSAlexander Shishkin &win->block[i].addr, GFP_KERNEL); 707d5c435dfSAlexander Shishkin 708d5c435dfSAlexander Shishkin if (!win->block[i].bdesc) 709d5c435dfSAlexander Shishkin goto err_nomem; 710ba82664cSAlexander Shishkin 711ba82664cSAlexander Shishkin #ifdef CONFIG_X86 712ba82664cSAlexander Shishkin /* Set the page as uncached */ 713ba82664cSAlexander Shishkin set_memory_uc((unsigned long)win->block[i].bdesc, 1); 714ba82664cSAlexander Shishkin #endif 715ba82664cSAlexander Shishkin } 716ba82664cSAlexander Shishkin 717ba82664cSAlexander Shishkin win->msc = msc; 718ba82664cSAlexander Shishkin win->nr_blocks = nr_blocks; 719ba82664cSAlexander Shishkin 720ba82664cSAlexander Shishkin if (list_empty(&msc->win_list)) { 721ba82664cSAlexander Shishkin msc->base = win->block[0].bdesc; 722ba82664cSAlexander Shishkin msc->base_addr = win->block[0].addr; 723ba82664cSAlexander Shishkin } 724ba82664cSAlexander Shishkin 725ba82664cSAlexander Shishkin list_add_tail(&win->entry, &msc->win_list); 726ba82664cSAlexander Shishkin msc->nr_pages += nr_blocks; 727ba82664cSAlexander Shishkin 728ba82664cSAlexander Shishkin return 0; 729ba82664cSAlexander Shishkin 730ba82664cSAlexander Shishkin err_nomem: 731ba82664cSAlexander Shishkin for (i--; i >= 0; i--) { 732ba82664cSAlexander Shishkin #ifdef CONFIG_X86 733ba82664cSAlexander Shishkin /* Reset the page to write-back before releasing */ 734ba82664cSAlexander Shishkin set_memory_wb((unsigned long)win->block[i].bdesc, 1); 735ba82664cSAlexander Shishkin #endif 736ba82664cSAlexander Shishkin dma_free_coherent(msc_dev(msc), size, win->block[i].bdesc, 737ba82664cSAlexander Shishkin win->block[i].addr); 738ba82664cSAlexander Shishkin } 739ba82664cSAlexander Shishkin kfree(win); 740ba82664cSAlexander Shishkin 741ba82664cSAlexander Shishkin return ret; 742ba82664cSAlexander Shishkin } 743ba82664cSAlexander Shishkin 744ba82664cSAlexander Shishkin /** 745ba82664cSAlexander Shishkin * msc_buffer_win_free() - free a window from MSC's window list 746ba82664cSAlexander Shishkin * @msc: MSC device 747ba82664cSAlexander Shishkin * @win: window to free 748ba82664cSAlexander Shishkin * 749ba82664cSAlexander Shishkin * This modifies msc::win_list and msc::base, which requires msc::buf_mutex 750ba82664cSAlexander Shishkin * to serialize, so the caller is expected to hold it. 751ba82664cSAlexander Shishkin */ 752ba82664cSAlexander Shishkin static void msc_buffer_win_free(struct msc *msc, struct msc_window *win) 753ba82664cSAlexander Shishkin { 754ba82664cSAlexander Shishkin int i; 755ba82664cSAlexander Shishkin 756ba82664cSAlexander Shishkin msc->nr_pages -= win->nr_blocks; 757ba82664cSAlexander Shishkin 758ba82664cSAlexander Shishkin list_del(&win->entry); 759ba82664cSAlexander Shishkin if (list_empty(&msc->win_list)) { 760ba82664cSAlexander Shishkin msc->base = NULL; 761ba82664cSAlexander Shishkin msc->base_addr = 0; 762ba82664cSAlexander Shishkin } 763ba82664cSAlexander Shishkin 764ba82664cSAlexander Shishkin for (i = 0; i < win->nr_blocks; i++) { 765ba82664cSAlexander Shishkin struct page *page = virt_to_page(win->block[i].bdesc); 766ba82664cSAlexander Shishkin 767ba82664cSAlexander Shishkin page->mapping = NULL; 768ba82664cSAlexander Shishkin #ifdef CONFIG_X86 769ba82664cSAlexander Shishkin /* Reset the page to write-back before releasing */ 770ba82664cSAlexander Shishkin set_memory_wb((unsigned long)win->block[i].bdesc, 1); 771ba82664cSAlexander Shishkin #endif 772ba82664cSAlexander Shishkin dma_free_coherent(msc_dev(win->msc), PAGE_SIZE, 773ba82664cSAlexander Shishkin win->block[i].bdesc, win->block[i].addr); 774ba82664cSAlexander Shishkin } 775ba82664cSAlexander Shishkin 776ba82664cSAlexander Shishkin kfree(win); 777ba82664cSAlexander Shishkin } 778ba82664cSAlexander Shishkin 779ba82664cSAlexander Shishkin /** 780ba82664cSAlexander Shishkin * msc_buffer_relink() - set up block descriptors for multiblock mode 781ba82664cSAlexander Shishkin * @msc: MSC device 782ba82664cSAlexander Shishkin * 783ba82664cSAlexander Shishkin * This traverses msc::win_list, which requires msc::buf_mutex to serialize, 784ba82664cSAlexander Shishkin * so the caller is expected to hold it. 785ba82664cSAlexander Shishkin */ 786ba82664cSAlexander Shishkin static void msc_buffer_relink(struct msc *msc) 787ba82664cSAlexander Shishkin { 788ba82664cSAlexander Shishkin struct msc_window *win, *next_win; 789ba82664cSAlexander Shishkin 790ba82664cSAlexander Shishkin /* call with msc::mutex locked */ 791ba82664cSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) { 792ba82664cSAlexander Shishkin unsigned int blk; 793ba82664cSAlexander Shishkin u32 sw_tag = 0; 794ba82664cSAlexander Shishkin 795ba82664cSAlexander Shishkin /* 796ba82664cSAlexander Shishkin * Last window's next_win should point to the first window 797ba82664cSAlexander Shishkin * and MSC_SW_TAG_LASTWIN should be set. 798ba82664cSAlexander Shishkin */ 799ba82664cSAlexander Shishkin if (msc_is_last_win(win)) { 800ba82664cSAlexander Shishkin sw_tag |= MSC_SW_TAG_LASTWIN; 801ba82664cSAlexander Shishkin next_win = list_entry(msc->win_list.next, 802ba82664cSAlexander Shishkin struct msc_window, entry); 803ba82664cSAlexander Shishkin } else { 804ba82664cSAlexander Shishkin next_win = list_entry(win->entry.next, 805ba82664cSAlexander Shishkin struct msc_window, entry); 806ba82664cSAlexander Shishkin } 807ba82664cSAlexander Shishkin 808ba82664cSAlexander Shishkin for (blk = 0; blk < win->nr_blocks; blk++) { 809ba82664cSAlexander Shishkin struct msc_block_desc *bdesc = win->block[blk].bdesc; 810ba82664cSAlexander Shishkin 811ba82664cSAlexander Shishkin memset(bdesc, 0, sizeof(*bdesc)); 812ba82664cSAlexander Shishkin 813ba82664cSAlexander Shishkin bdesc->next_win = next_win->block[0].addr >> PAGE_SHIFT; 814ba82664cSAlexander Shishkin 815ba82664cSAlexander Shishkin /* 816ba82664cSAlexander Shishkin * Similarly to last window, last block should point 817ba82664cSAlexander Shishkin * to the first one. 818ba82664cSAlexander Shishkin */ 819ba82664cSAlexander Shishkin if (blk == win->nr_blocks - 1) { 820ba82664cSAlexander Shishkin sw_tag |= MSC_SW_TAG_LASTBLK; 821ba82664cSAlexander Shishkin bdesc->next_blk = 822ba82664cSAlexander Shishkin win->block[0].addr >> PAGE_SHIFT; 823ba82664cSAlexander Shishkin } else { 824ba82664cSAlexander Shishkin bdesc->next_blk = 825ba82664cSAlexander Shishkin win->block[blk + 1].addr >> PAGE_SHIFT; 826ba82664cSAlexander Shishkin } 827ba82664cSAlexander Shishkin 828ba82664cSAlexander Shishkin bdesc->sw_tag = sw_tag; 829ba82664cSAlexander Shishkin bdesc->block_sz = PAGE_SIZE / 64; 830ba82664cSAlexander Shishkin } 831ba82664cSAlexander Shishkin } 832ba82664cSAlexander Shishkin 833ba82664cSAlexander Shishkin /* 834ba82664cSAlexander Shishkin * Make the above writes globally visible before tracing is 835ba82664cSAlexander Shishkin * enabled to make sure hardware sees them coherently. 836ba82664cSAlexander Shishkin */ 837ba82664cSAlexander Shishkin wmb(); 838ba82664cSAlexander Shishkin } 839ba82664cSAlexander Shishkin 840ba82664cSAlexander Shishkin static void msc_buffer_multi_free(struct msc *msc) 841ba82664cSAlexander Shishkin { 842ba82664cSAlexander Shishkin struct msc_window *win, *iter; 843ba82664cSAlexander Shishkin 844ba82664cSAlexander Shishkin list_for_each_entry_safe(win, iter, &msc->win_list, entry) 845ba82664cSAlexander Shishkin msc_buffer_win_free(msc, win); 846ba82664cSAlexander Shishkin } 847ba82664cSAlexander Shishkin 848ba82664cSAlexander Shishkin static int msc_buffer_multi_alloc(struct msc *msc, unsigned long *nr_pages, 849ba82664cSAlexander Shishkin unsigned int nr_wins) 850ba82664cSAlexander Shishkin { 851ba82664cSAlexander Shishkin int ret, i; 852ba82664cSAlexander Shishkin 853ba82664cSAlexander Shishkin for (i = 0; i < nr_wins; i++) { 854ba82664cSAlexander Shishkin ret = msc_buffer_win_alloc(msc, nr_pages[i]); 855ba82664cSAlexander Shishkin if (ret) { 856ba82664cSAlexander Shishkin msc_buffer_multi_free(msc); 857ba82664cSAlexander Shishkin return ret; 858ba82664cSAlexander Shishkin } 859ba82664cSAlexander Shishkin } 860ba82664cSAlexander Shishkin 861ba82664cSAlexander Shishkin msc_buffer_relink(msc); 862ba82664cSAlexander Shishkin 863ba82664cSAlexander Shishkin return 0; 864ba82664cSAlexander Shishkin } 865ba82664cSAlexander Shishkin 866ba82664cSAlexander Shishkin /** 867ba82664cSAlexander Shishkin * msc_buffer_free() - free buffers for MSC 868ba82664cSAlexander Shishkin * @msc: MSC device 869ba82664cSAlexander Shishkin * 870ba82664cSAlexander Shishkin * Free MSC's storage buffers. 871ba82664cSAlexander Shishkin * 872ba82664cSAlexander Shishkin * This modifies msc::win_list and msc::base, which requires msc::buf_mutex to 873ba82664cSAlexander Shishkin * serialize, so the caller is expected to hold it. 874ba82664cSAlexander Shishkin */ 875ba82664cSAlexander Shishkin static void msc_buffer_free(struct msc *msc) 876ba82664cSAlexander Shishkin { 877ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) 878ba82664cSAlexander Shishkin msc_buffer_contig_free(msc); 879ba82664cSAlexander Shishkin else if (msc->mode == MSC_MODE_MULTI) 880ba82664cSAlexander Shishkin msc_buffer_multi_free(msc); 881ba82664cSAlexander Shishkin } 882ba82664cSAlexander Shishkin 883ba82664cSAlexander Shishkin /** 884ba82664cSAlexander Shishkin * msc_buffer_alloc() - allocate a buffer for MSC 885ba82664cSAlexander Shishkin * @msc: MSC device 886ba82664cSAlexander Shishkin * @size: allocation size in bytes 887ba82664cSAlexander Shishkin * 888ba82664cSAlexander Shishkin * Allocate a storage buffer for MSC, depending on the msc::mode, it will be 889ba82664cSAlexander Shishkin * either done via msc_buffer_contig_alloc() for SINGLE operation mode or 890ba82664cSAlexander Shishkin * msc_buffer_win_alloc() for multiblock operation. The latter allocates one 891ba82664cSAlexander Shishkin * window per invocation, so in multiblock mode this can be called multiple 892ba82664cSAlexander Shishkin * times for the same MSC to allocate multiple windows. 893ba82664cSAlexander Shishkin * 894ba82664cSAlexander Shishkin * This modifies msc::win_list and msc::base, which requires msc::buf_mutex 895ba82664cSAlexander Shishkin * to serialize, so the caller is expected to hold it. 896ba82664cSAlexander Shishkin * 897ba82664cSAlexander Shishkin * Return: 0 on success, -errno otherwise. 898ba82664cSAlexander Shishkin */ 899ba82664cSAlexander Shishkin static int msc_buffer_alloc(struct msc *msc, unsigned long *nr_pages, 900ba82664cSAlexander Shishkin unsigned int nr_wins) 901ba82664cSAlexander Shishkin { 902ba82664cSAlexander Shishkin int ret; 903ba82664cSAlexander Shishkin 904ba82664cSAlexander Shishkin /* -1: buffer not allocated */ 905ba82664cSAlexander Shishkin if (atomic_read(&msc->user_count) != -1) 906ba82664cSAlexander Shishkin return -EBUSY; 907ba82664cSAlexander Shishkin 908ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) { 909ba82664cSAlexander Shishkin if (nr_wins != 1) 910ba82664cSAlexander Shishkin return -EINVAL; 911ba82664cSAlexander Shishkin 912ba82664cSAlexander Shishkin ret = msc_buffer_contig_alloc(msc, nr_pages[0] << PAGE_SHIFT); 913ba82664cSAlexander Shishkin } else if (msc->mode == MSC_MODE_MULTI) { 914ba82664cSAlexander Shishkin ret = msc_buffer_multi_alloc(msc, nr_pages, nr_wins); 915ba82664cSAlexander Shishkin } else { 916ba82664cSAlexander Shishkin ret = -ENOTSUPP; 917ba82664cSAlexander Shishkin } 918ba82664cSAlexander Shishkin 919ba82664cSAlexander Shishkin if (!ret) { 920ba82664cSAlexander Shishkin /* allocation should be visible before the counter goes to 0 */ 921ba82664cSAlexander Shishkin smp_mb__before_atomic(); 922ba82664cSAlexander Shishkin 923ba82664cSAlexander Shishkin if (WARN_ON_ONCE(atomic_cmpxchg(&msc->user_count, -1, 0) != -1)) 924ba82664cSAlexander Shishkin return -EINVAL; 925ba82664cSAlexander Shishkin } 926ba82664cSAlexander Shishkin 927ba82664cSAlexander Shishkin return ret; 928ba82664cSAlexander Shishkin } 929ba82664cSAlexander Shishkin 930ba82664cSAlexander Shishkin /** 931ba82664cSAlexander Shishkin * msc_buffer_unlocked_free_unless_used() - free a buffer unless it's in use 932ba82664cSAlexander Shishkin * @msc: MSC device 933ba82664cSAlexander Shishkin * 934ba82664cSAlexander Shishkin * This will free MSC buffer unless it is in use or there is no allocated 935ba82664cSAlexander Shishkin * buffer. 936ba82664cSAlexander Shishkin * Caller needs to hold msc::buf_mutex. 937ba82664cSAlexander Shishkin * 938ba82664cSAlexander Shishkin * Return: 0 on successful deallocation or if there was no buffer to 939ba82664cSAlexander Shishkin * deallocate, -EBUSY if there are active users. 940ba82664cSAlexander Shishkin */ 941ba82664cSAlexander Shishkin static int msc_buffer_unlocked_free_unless_used(struct msc *msc) 942ba82664cSAlexander Shishkin { 943ba82664cSAlexander Shishkin int count, ret = 0; 944ba82664cSAlexander Shishkin 945ba82664cSAlexander Shishkin count = atomic_cmpxchg(&msc->user_count, 0, -1); 946ba82664cSAlexander Shishkin 947ba82664cSAlexander Shishkin /* > 0: buffer is allocated and has users */ 948ba82664cSAlexander Shishkin if (count > 0) 949ba82664cSAlexander Shishkin ret = -EBUSY; 950ba82664cSAlexander Shishkin /* 0: buffer is allocated, no users */ 951ba82664cSAlexander Shishkin else if (!count) 952ba82664cSAlexander Shishkin msc_buffer_free(msc); 953ba82664cSAlexander Shishkin /* < 0: no buffer, nothing to do */ 954ba82664cSAlexander Shishkin 955ba82664cSAlexander Shishkin return ret; 956ba82664cSAlexander Shishkin } 957ba82664cSAlexander Shishkin 958ba82664cSAlexander Shishkin /** 959ba82664cSAlexander Shishkin * msc_buffer_free_unless_used() - free a buffer unless it's in use 960ba82664cSAlexander Shishkin * @msc: MSC device 961ba82664cSAlexander Shishkin * 962ba82664cSAlexander Shishkin * This is a locked version of msc_buffer_unlocked_free_unless_used(). 963ba82664cSAlexander Shishkin */ 964ba82664cSAlexander Shishkin static int msc_buffer_free_unless_used(struct msc *msc) 965ba82664cSAlexander Shishkin { 966ba82664cSAlexander Shishkin int ret; 967ba82664cSAlexander Shishkin 968ba82664cSAlexander Shishkin mutex_lock(&msc->buf_mutex); 969ba82664cSAlexander Shishkin ret = msc_buffer_unlocked_free_unless_used(msc); 970ba82664cSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 971ba82664cSAlexander Shishkin 972ba82664cSAlexander Shishkin return ret; 973ba82664cSAlexander Shishkin } 974ba82664cSAlexander Shishkin 975ba82664cSAlexander Shishkin /** 976ba82664cSAlexander Shishkin * msc_buffer_get_page() - get MSC buffer page at a given offset 977ba82664cSAlexander Shishkin * @msc: MSC device 978ba82664cSAlexander Shishkin * @pgoff: page offset into the storage buffer 979ba82664cSAlexander Shishkin * 980ba82664cSAlexander Shishkin * This traverses msc::win_list, so holding msc::buf_mutex is expected from 981ba82664cSAlexander Shishkin * the caller. 982ba82664cSAlexander Shishkin * 983ba82664cSAlexander Shishkin * Return: page if @pgoff corresponds to a valid buffer page or NULL. 984ba82664cSAlexander Shishkin */ 985ba82664cSAlexander Shishkin static struct page *msc_buffer_get_page(struct msc *msc, unsigned long pgoff) 986ba82664cSAlexander Shishkin { 987ba82664cSAlexander Shishkin struct msc_window *win; 988ba82664cSAlexander Shishkin 989ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) 990ba82664cSAlexander Shishkin return msc_buffer_contig_get_page(msc, pgoff); 991ba82664cSAlexander Shishkin 992ba82664cSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) 993ba82664cSAlexander Shishkin if (pgoff >= win->pgoff && pgoff < win->pgoff + win->nr_blocks) 994ba82664cSAlexander Shishkin goto found; 995ba82664cSAlexander Shishkin 996ba82664cSAlexander Shishkin return NULL; 997ba82664cSAlexander Shishkin 998ba82664cSAlexander Shishkin found: 999ba82664cSAlexander Shishkin pgoff -= win->pgoff; 1000ba82664cSAlexander Shishkin return virt_to_page(win->block[pgoff].bdesc); 1001ba82664cSAlexander Shishkin } 1002ba82664cSAlexander Shishkin 1003ba82664cSAlexander Shishkin /** 1004ba82664cSAlexander Shishkin * struct msc_win_to_user_struct - data for copy_to_user() callback 1005ba82664cSAlexander Shishkin * @buf: userspace buffer to copy data to 1006ba82664cSAlexander Shishkin * @offset: running offset 1007ba82664cSAlexander Shishkin */ 1008ba82664cSAlexander Shishkin struct msc_win_to_user_struct { 1009ba82664cSAlexander Shishkin char __user *buf; 1010ba82664cSAlexander Shishkin unsigned long offset; 1011ba82664cSAlexander Shishkin }; 1012ba82664cSAlexander Shishkin 1013ba82664cSAlexander Shishkin /** 1014ba82664cSAlexander Shishkin * msc_win_to_user() - iterator for msc_buffer_iterate() to copy data to user 1015ba82664cSAlexander Shishkin * @data: callback's private data 1016ba82664cSAlexander Shishkin * @src: source buffer 1017ba82664cSAlexander Shishkin * @len: amount of data to copy from the source buffer 1018ba82664cSAlexander Shishkin */ 1019ba82664cSAlexander Shishkin static unsigned long msc_win_to_user(void *data, void *src, size_t len) 1020ba82664cSAlexander Shishkin { 1021ba82664cSAlexander Shishkin struct msc_win_to_user_struct *u = data; 1022ba82664cSAlexander Shishkin unsigned long ret; 1023ba82664cSAlexander Shishkin 1024ba82664cSAlexander Shishkin ret = copy_to_user(u->buf + u->offset, src, len); 1025ba82664cSAlexander Shishkin u->offset += len - ret; 1026ba82664cSAlexander Shishkin 1027ba82664cSAlexander Shishkin return ret; 1028ba82664cSAlexander Shishkin } 1029ba82664cSAlexander Shishkin 1030ba82664cSAlexander Shishkin 1031ba82664cSAlexander Shishkin /* 1032ba82664cSAlexander Shishkin * file operations' callbacks 1033ba82664cSAlexander Shishkin */ 1034ba82664cSAlexander Shishkin 1035ba82664cSAlexander Shishkin static int intel_th_msc_open(struct inode *inode, struct file *file) 1036ba82664cSAlexander Shishkin { 1037ba82664cSAlexander Shishkin struct intel_th_device *thdev = file->private_data; 1038ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 1039ba82664cSAlexander Shishkin struct msc_iter *iter; 1040ba82664cSAlexander Shishkin 1041ba82664cSAlexander Shishkin if (!capable(CAP_SYS_RAWIO)) 1042ba82664cSAlexander Shishkin return -EPERM; 1043ba82664cSAlexander Shishkin 1044ba82664cSAlexander Shishkin iter = msc_iter_install(msc); 1045a45ff6edSAlexander Shishkin if (IS_ERR(iter)) 1046a45ff6edSAlexander Shishkin return PTR_ERR(iter); 1047ba82664cSAlexander Shishkin 1048ba82664cSAlexander Shishkin file->private_data = iter; 1049ba82664cSAlexander Shishkin 1050ba82664cSAlexander Shishkin return nonseekable_open(inode, file); 1051ba82664cSAlexander Shishkin } 1052ba82664cSAlexander Shishkin 1053ba82664cSAlexander Shishkin static int intel_th_msc_release(struct inode *inode, struct file *file) 1054ba82664cSAlexander Shishkin { 1055ba82664cSAlexander Shishkin struct msc_iter *iter = file->private_data; 1056ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1057ba82664cSAlexander Shishkin 1058ba82664cSAlexander Shishkin msc_iter_remove(iter, msc); 1059ba82664cSAlexander Shishkin 1060ba82664cSAlexander Shishkin return 0; 1061ba82664cSAlexander Shishkin } 1062ba82664cSAlexander Shishkin 1063ba82664cSAlexander Shishkin static ssize_t 1064ba82664cSAlexander Shishkin msc_single_to_user(struct msc *msc, char __user *buf, loff_t off, size_t len) 1065ba82664cSAlexander Shishkin { 1066ed392688SAlexander Shishkin unsigned long size = msc->nr_pages << PAGE_SHIFT, rem = len; 1067ba82664cSAlexander Shishkin unsigned long start = off, tocopy = 0; 1068ba82664cSAlexander Shishkin 1069ba82664cSAlexander Shishkin if (msc->single_wrap) { 1070ba82664cSAlexander Shishkin start += msc->single_sz; 1071ba82664cSAlexander Shishkin if (start < size) { 1072ba82664cSAlexander Shishkin tocopy = min(rem, size - start); 1073ba82664cSAlexander Shishkin if (copy_to_user(buf, msc->base + start, tocopy)) 1074ba82664cSAlexander Shishkin return -EFAULT; 1075ba82664cSAlexander Shishkin 1076ba82664cSAlexander Shishkin buf += tocopy; 1077ba82664cSAlexander Shishkin rem -= tocopy; 1078ba82664cSAlexander Shishkin start += tocopy; 1079ba82664cSAlexander Shishkin } 1080ba82664cSAlexander Shishkin 1081ba82664cSAlexander Shishkin start &= size - 1; 1082ba82664cSAlexander Shishkin if (rem) { 1083ba82664cSAlexander Shishkin tocopy = min(rem, msc->single_sz - start); 1084ba82664cSAlexander Shishkin if (copy_to_user(buf, msc->base + start, tocopy)) 1085ba82664cSAlexander Shishkin return -EFAULT; 1086ba82664cSAlexander Shishkin 1087ba82664cSAlexander Shishkin rem -= tocopy; 1088ba82664cSAlexander Shishkin } 1089ba82664cSAlexander Shishkin 1090ba82664cSAlexander Shishkin return len - rem; 1091ba82664cSAlexander Shishkin } 1092ba82664cSAlexander Shishkin 1093ba82664cSAlexander Shishkin if (copy_to_user(buf, msc->base + start, rem)) 1094ba82664cSAlexander Shishkin return -EFAULT; 1095ba82664cSAlexander Shishkin 1096ba82664cSAlexander Shishkin return len; 1097ba82664cSAlexander Shishkin } 1098ba82664cSAlexander Shishkin 1099ba82664cSAlexander Shishkin static ssize_t intel_th_msc_read(struct file *file, char __user *buf, 1100ba82664cSAlexander Shishkin size_t len, loff_t *ppos) 1101ba82664cSAlexander Shishkin { 1102ba82664cSAlexander Shishkin struct msc_iter *iter = file->private_data; 1103ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1104ba82664cSAlexander Shishkin size_t size; 1105ba82664cSAlexander Shishkin loff_t off = *ppos; 1106ba82664cSAlexander Shishkin ssize_t ret = 0; 1107ba82664cSAlexander Shishkin 1108ba82664cSAlexander Shishkin if (!atomic_inc_unless_negative(&msc->user_count)) 1109ba82664cSAlexander Shishkin return 0; 1110ba82664cSAlexander Shishkin 1111ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE && !msc->single_wrap) 1112ba82664cSAlexander Shishkin size = msc->single_sz; 1113ba82664cSAlexander Shishkin else 1114ba82664cSAlexander Shishkin size = msc->nr_pages << PAGE_SHIFT; 1115ba82664cSAlexander Shishkin 1116ba82664cSAlexander Shishkin if (!size) 1117ba82664cSAlexander Shishkin goto put_count; 11182bed074aSLaurent FERT 11192bed074aSLaurent FERT if (off >= size) 11202bed074aSLaurent FERT goto put_count; 11212bed074aSLaurent FERT 1122ba82664cSAlexander Shishkin if (off + len >= size) 1123ba82664cSAlexander Shishkin len = size - off; 1124ba82664cSAlexander Shishkin 1125ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) { 1126ba82664cSAlexander Shishkin ret = msc_single_to_user(msc, buf, off, len); 1127ba82664cSAlexander Shishkin if (ret >= 0) 1128ba82664cSAlexander Shishkin *ppos += ret; 1129ba82664cSAlexander Shishkin } else if (msc->mode == MSC_MODE_MULTI) { 1130ba82664cSAlexander Shishkin struct msc_win_to_user_struct u = { 1131ba82664cSAlexander Shishkin .buf = buf, 1132ba82664cSAlexander Shishkin .offset = 0, 1133ba82664cSAlexander Shishkin }; 1134ba82664cSAlexander Shishkin 1135ba82664cSAlexander Shishkin ret = msc_buffer_iterate(iter, len, &u, msc_win_to_user); 1136ba82664cSAlexander Shishkin if (ret >= 0) 1137ba82664cSAlexander Shishkin *ppos = iter->offset; 1138ba82664cSAlexander Shishkin } else { 1139ba82664cSAlexander Shishkin ret = -ENOTSUPP; 1140ba82664cSAlexander Shishkin } 1141ba82664cSAlexander Shishkin 1142ba82664cSAlexander Shishkin put_count: 1143ba82664cSAlexander Shishkin atomic_dec(&msc->user_count); 1144ba82664cSAlexander Shishkin 1145ba82664cSAlexander Shishkin return ret; 1146ba82664cSAlexander Shishkin } 1147ba82664cSAlexander Shishkin 1148ba82664cSAlexander Shishkin /* 1149ba82664cSAlexander Shishkin * vm operations callbacks (vm_ops) 1150ba82664cSAlexander Shishkin */ 1151ba82664cSAlexander Shishkin 1152ba82664cSAlexander Shishkin static void msc_mmap_open(struct vm_area_struct *vma) 1153ba82664cSAlexander Shishkin { 1154ba82664cSAlexander Shishkin struct msc_iter *iter = vma->vm_file->private_data; 1155ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1156ba82664cSAlexander Shishkin 1157ba82664cSAlexander Shishkin atomic_inc(&msc->mmap_count); 1158ba82664cSAlexander Shishkin } 1159ba82664cSAlexander Shishkin 1160ba82664cSAlexander Shishkin static void msc_mmap_close(struct vm_area_struct *vma) 1161ba82664cSAlexander Shishkin { 1162ba82664cSAlexander Shishkin struct msc_iter *iter = vma->vm_file->private_data; 1163ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1164ba82664cSAlexander Shishkin unsigned long pg; 1165ba82664cSAlexander Shishkin 1166ba82664cSAlexander Shishkin if (!atomic_dec_and_mutex_lock(&msc->mmap_count, &msc->buf_mutex)) 1167ba82664cSAlexander Shishkin return; 1168ba82664cSAlexander Shishkin 11690139aa7bSJoonsoo Kim /* drop page _refcounts */ 1170ba82664cSAlexander Shishkin for (pg = 0; pg < msc->nr_pages; pg++) { 1171ba82664cSAlexander Shishkin struct page *page = msc_buffer_get_page(msc, pg); 1172ba82664cSAlexander Shishkin 1173ba82664cSAlexander Shishkin if (WARN_ON_ONCE(!page)) 1174ba82664cSAlexander Shishkin continue; 1175ba82664cSAlexander Shishkin 1176ba82664cSAlexander Shishkin if (page->mapping) 1177ba82664cSAlexander Shishkin page->mapping = NULL; 1178ba82664cSAlexander Shishkin } 1179ba82664cSAlexander Shishkin 1180ba82664cSAlexander Shishkin /* last mapping -- drop user_count */ 1181ba82664cSAlexander Shishkin atomic_dec(&msc->user_count); 1182ba82664cSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 1183ba82664cSAlexander Shishkin } 1184ba82664cSAlexander Shishkin 118511bac800SDave Jiang static int msc_mmap_fault(struct vm_fault *vmf) 1186ba82664cSAlexander Shishkin { 118711bac800SDave Jiang struct msc_iter *iter = vmf->vma->vm_file->private_data; 1188ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1189ba82664cSAlexander Shishkin 1190ba82664cSAlexander Shishkin vmf->page = msc_buffer_get_page(msc, vmf->pgoff); 1191ba82664cSAlexander Shishkin if (!vmf->page) 1192ba82664cSAlexander Shishkin return VM_FAULT_SIGBUS; 1193ba82664cSAlexander Shishkin 1194ba82664cSAlexander Shishkin get_page(vmf->page); 119511bac800SDave Jiang vmf->page->mapping = vmf->vma->vm_file->f_mapping; 1196ba82664cSAlexander Shishkin vmf->page->index = vmf->pgoff; 1197ba82664cSAlexander Shishkin 1198ba82664cSAlexander Shishkin return 0; 1199ba82664cSAlexander Shishkin } 1200ba82664cSAlexander Shishkin 1201ba82664cSAlexander Shishkin static const struct vm_operations_struct msc_mmap_ops = { 1202ba82664cSAlexander Shishkin .open = msc_mmap_open, 1203ba82664cSAlexander Shishkin .close = msc_mmap_close, 1204ba82664cSAlexander Shishkin .fault = msc_mmap_fault, 1205ba82664cSAlexander Shishkin }; 1206ba82664cSAlexander Shishkin 1207ba82664cSAlexander Shishkin static int intel_th_msc_mmap(struct file *file, struct vm_area_struct *vma) 1208ba82664cSAlexander Shishkin { 1209ba82664cSAlexander Shishkin unsigned long size = vma->vm_end - vma->vm_start; 1210ba82664cSAlexander Shishkin struct msc_iter *iter = vma->vm_file->private_data; 1211ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1212ba82664cSAlexander Shishkin int ret = -EINVAL; 1213ba82664cSAlexander Shishkin 1214ba82664cSAlexander Shishkin if (!size || offset_in_page(size)) 1215ba82664cSAlexander Shishkin return -EINVAL; 1216ba82664cSAlexander Shishkin 1217ba82664cSAlexander Shishkin if (vma->vm_pgoff) 1218ba82664cSAlexander Shishkin return -EINVAL; 1219ba82664cSAlexander Shishkin 1220ba82664cSAlexander Shishkin /* grab user_count once per mmap; drop in msc_mmap_close() */ 1221ba82664cSAlexander Shishkin if (!atomic_inc_unless_negative(&msc->user_count)) 1222ba82664cSAlexander Shishkin return -EINVAL; 1223ba82664cSAlexander Shishkin 1224ba82664cSAlexander Shishkin if (msc->mode != MSC_MODE_SINGLE && 1225ba82664cSAlexander Shishkin msc->mode != MSC_MODE_MULTI) 1226ba82664cSAlexander Shishkin goto out; 1227ba82664cSAlexander Shishkin 1228ba82664cSAlexander Shishkin if (size >> PAGE_SHIFT != msc->nr_pages) 1229ba82664cSAlexander Shishkin goto out; 1230ba82664cSAlexander Shishkin 1231ba82664cSAlexander Shishkin atomic_set(&msc->mmap_count, 1); 1232ba82664cSAlexander Shishkin ret = 0; 1233ba82664cSAlexander Shishkin 1234ba82664cSAlexander Shishkin out: 1235ba82664cSAlexander Shishkin if (ret) 1236ba82664cSAlexander Shishkin atomic_dec(&msc->user_count); 1237ba82664cSAlexander Shishkin 1238ba82664cSAlexander Shishkin vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 1239ba82664cSAlexander Shishkin vma->vm_flags |= VM_DONTEXPAND | VM_DONTCOPY; 1240ba82664cSAlexander Shishkin vma->vm_ops = &msc_mmap_ops; 1241ba82664cSAlexander Shishkin return ret; 1242ba82664cSAlexander Shishkin } 1243ba82664cSAlexander Shishkin 1244ba82664cSAlexander Shishkin static const struct file_operations intel_th_msc_fops = { 1245ba82664cSAlexander Shishkin .open = intel_th_msc_open, 1246ba82664cSAlexander Shishkin .release = intel_th_msc_release, 1247ba82664cSAlexander Shishkin .read = intel_th_msc_read, 1248ba82664cSAlexander Shishkin .mmap = intel_th_msc_mmap, 1249ba82664cSAlexander Shishkin .llseek = no_llseek, 12508e9a2bebSAlexander Shishkin .owner = THIS_MODULE, 1251ba82664cSAlexander Shishkin }; 1252ba82664cSAlexander Shishkin 1253ba82664cSAlexander Shishkin static int intel_th_msc_init(struct msc *msc) 1254ba82664cSAlexander Shishkin { 1255ba82664cSAlexander Shishkin atomic_set(&msc->user_count, -1); 1256ba82664cSAlexander Shishkin 1257ba82664cSAlexander Shishkin msc->mode = MSC_MODE_MULTI; 1258ba82664cSAlexander Shishkin mutex_init(&msc->buf_mutex); 1259ba82664cSAlexander Shishkin INIT_LIST_HEAD(&msc->win_list); 1260ba82664cSAlexander Shishkin INIT_LIST_HEAD(&msc->iter_list); 1261ba82664cSAlexander Shishkin 1262ba82664cSAlexander Shishkin msc->burst_len = 1263ba82664cSAlexander Shishkin (ioread32(msc->reg_base + REG_MSU_MSC0CTL) & MSC_LEN) >> 1264ba82664cSAlexander Shishkin __ffs(MSC_LEN); 1265ba82664cSAlexander Shishkin 1266ba82664cSAlexander Shishkin return 0; 1267ba82664cSAlexander Shishkin } 1268ba82664cSAlexander Shishkin 1269ba82664cSAlexander Shishkin static const char * const msc_mode[] = { 1270ba82664cSAlexander Shishkin [MSC_MODE_SINGLE] = "single", 1271ba82664cSAlexander Shishkin [MSC_MODE_MULTI] = "multi", 1272ba82664cSAlexander Shishkin [MSC_MODE_EXI] = "ExI", 1273ba82664cSAlexander Shishkin [MSC_MODE_DEBUG] = "debug", 1274ba82664cSAlexander Shishkin }; 1275ba82664cSAlexander Shishkin 1276ba82664cSAlexander Shishkin static ssize_t 1277ba82664cSAlexander Shishkin wrap_show(struct device *dev, struct device_attribute *attr, char *buf) 1278ba82664cSAlexander Shishkin { 1279ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1280ba82664cSAlexander Shishkin 1281ba82664cSAlexander Shishkin return scnprintf(buf, PAGE_SIZE, "%d\n", msc->wrap); 1282ba82664cSAlexander Shishkin } 1283ba82664cSAlexander Shishkin 1284ba82664cSAlexander Shishkin static ssize_t 1285ba82664cSAlexander Shishkin wrap_store(struct device *dev, struct device_attribute *attr, const char *buf, 1286ba82664cSAlexander Shishkin size_t size) 1287ba82664cSAlexander Shishkin { 1288ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1289ba82664cSAlexander Shishkin unsigned long val; 1290ba82664cSAlexander Shishkin int ret; 1291ba82664cSAlexander Shishkin 1292ba82664cSAlexander Shishkin ret = kstrtoul(buf, 10, &val); 1293ba82664cSAlexander Shishkin if (ret) 1294ba82664cSAlexander Shishkin return ret; 1295ba82664cSAlexander Shishkin 1296ba82664cSAlexander Shishkin msc->wrap = !!val; 1297ba82664cSAlexander Shishkin 1298ba82664cSAlexander Shishkin return size; 1299ba82664cSAlexander Shishkin } 1300ba82664cSAlexander Shishkin 1301ba82664cSAlexander Shishkin static DEVICE_ATTR_RW(wrap); 1302ba82664cSAlexander Shishkin 1303ba82664cSAlexander Shishkin static ssize_t 1304ba82664cSAlexander Shishkin mode_show(struct device *dev, struct device_attribute *attr, char *buf) 1305ba82664cSAlexander Shishkin { 1306ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1307ba82664cSAlexander Shishkin 1308ba82664cSAlexander Shishkin return scnprintf(buf, PAGE_SIZE, "%s\n", msc_mode[msc->mode]); 1309ba82664cSAlexander Shishkin } 1310ba82664cSAlexander Shishkin 1311ba82664cSAlexander Shishkin static ssize_t 1312ba82664cSAlexander Shishkin mode_store(struct device *dev, struct device_attribute *attr, const char *buf, 1313ba82664cSAlexander Shishkin size_t size) 1314ba82664cSAlexander Shishkin { 1315ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1316ba82664cSAlexander Shishkin size_t len = size; 1317ba82664cSAlexander Shishkin char *cp; 1318ba82664cSAlexander Shishkin int i, ret; 1319ba82664cSAlexander Shishkin 1320ba82664cSAlexander Shishkin if (!capable(CAP_SYS_RAWIO)) 1321ba82664cSAlexander Shishkin return -EPERM; 1322ba82664cSAlexander Shishkin 1323ba82664cSAlexander Shishkin cp = memchr(buf, '\n', len); 1324ba82664cSAlexander Shishkin if (cp) 1325ba82664cSAlexander Shishkin len = cp - buf; 1326ba82664cSAlexander Shishkin 1327ba82664cSAlexander Shishkin for (i = 0; i < ARRAY_SIZE(msc_mode); i++) 1328ba82664cSAlexander Shishkin if (!strncmp(msc_mode[i], buf, len)) 1329ba82664cSAlexander Shishkin goto found; 1330ba82664cSAlexander Shishkin 1331ba82664cSAlexander Shishkin return -EINVAL; 1332ba82664cSAlexander Shishkin 1333ba82664cSAlexander Shishkin found: 1334ba82664cSAlexander Shishkin mutex_lock(&msc->buf_mutex); 1335ba82664cSAlexander Shishkin ret = msc_buffer_unlocked_free_unless_used(msc); 1336ba82664cSAlexander Shishkin if (!ret) 1337ba82664cSAlexander Shishkin msc->mode = i; 1338ba82664cSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 1339ba82664cSAlexander Shishkin 1340ba82664cSAlexander Shishkin return ret ? ret : size; 1341ba82664cSAlexander Shishkin } 1342ba82664cSAlexander Shishkin 1343ba82664cSAlexander Shishkin static DEVICE_ATTR_RW(mode); 1344ba82664cSAlexander Shishkin 1345ba82664cSAlexander Shishkin static ssize_t 1346ba82664cSAlexander Shishkin nr_pages_show(struct device *dev, struct device_attribute *attr, char *buf) 1347ba82664cSAlexander Shishkin { 1348ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1349ba82664cSAlexander Shishkin struct msc_window *win; 1350ba82664cSAlexander Shishkin size_t count = 0; 1351ba82664cSAlexander Shishkin 1352ba82664cSAlexander Shishkin mutex_lock(&msc->buf_mutex); 1353ba82664cSAlexander Shishkin 1354ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) 1355ba82664cSAlexander Shishkin count = scnprintf(buf, PAGE_SIZE, "%ld\n", msc->nr_pages); 1356ba82664cSAlexander Shishkin else if (msc->mode == MSC_MODE_MULTI) { 1357ba82664cSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) { 1358ba82664cSAlexander Shishkin count += scnprintf(buf + count, PAGE_SIZE - count, 1359ba82664cSAlexander Shishkin "%d%c", win->nr_blocks, 1360ba82664cSAlexander Shishkin msc_is_last_win(win) ? '\n' : ','); 1361ba82664cSAlexander Shishkin } 1362ba82664cSAlexander Shishkin } else { 1363ba82664cSAlexander Shishkin count = scnprintf(buf, PAGE_SIZE, "unsupported\n"); 1364ba82664cSAlexander Shishkin } 1365ba82664cSAlexander Shishkin 1366ba82664cSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 1367ba82664cSAlexander Shishkin 1368ba82664cSAlexander Shishkin return count; 1369ba82664cSAlexander Shishkin } 1370ba82664cSAlexander Shishkin 1371ba82664cSAlexander Shishkin static ssize_t 1372ba82664cSAlexander Shishkin nr_pages_store(struct device *dev, struct device_attribute *attr, 1373ba82664cSAlexander Shishkin const char *buf, size_t size) 1374ba82664cSAlexander Shishkin { 1375ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1376ba82664cSAlexander Shishkin unsigned long val, *win = NULL, *rewin; 1377ba82664cSAlexander Shishkin size_t len = size; 1378ba82664cSAlexander Shishkin const char *p = buf; 1379ba82664cSAlexander Shishkin char *end, *s; 1380ba82664cSAlexander Shishkin int ret, nr_wins = 0; 1381ba82664cSAlexander Shishkin 1382ba82664cSAlexander Shishkin if (!capable(CAP_SYS_RAWIO)) 1383ba82664cSAlexander Shishkin return -EPERM; 1384ba82664cSAlexander Shishkin 1385ba82664cSAlexander Shishkin ret = msc_buffer_free_unless_used(msc); 1386ba82664cSAlexander Shishkin if (ret) 1387ba82664cSAlexander Shishkin return ret; 1388ba82664cSAlexander Shishkin 1389ba82664cSAlexander Shishkin /* scan the comma-separated list of allocation sizes */ 1390ba82664cSAlexander Shishkin end = memchr(buf, '\n', len); 1391ba82664cSAlexander Shishkin if (end) 1392ba82664cSAlexander Shishkin len = end - buf; 1393ba82664cSAlexander Shishkin 1394ba82664cSAlexander Shishkin do { 1395ba82664cSAlexander Shishkin end = memchr(p, ',', len); 1396ba82664cSAlexander Shishkin s = kstrndup(p, end ? end - p : len, GFP_KERNEL); 13976575cbd6SAlexander Shishkin if (!s) { 13986575cbd6SAlexander Shishkin ret = -ENOMEM; 13996575cbd6SAlexander Shishkin goto free_win; 14006575cbd6SAlexander Shishkin } 14016575cbd6SAlexander Shishkin 1402ba82664cSAlexander Shishkin ret = kstrtoul(s, 10, &val); 1403ba82664cSAlexander Shishkin kfree(s); 1404ba82664cSAlexander Shishkin 1405ba82664cSAlexander Shishkin if (ret || !val) 1406ba82664cSAlexander Shishkin goto free_win; 1407ba82664cSAlexander Shishkin 1408ba82664cSAlexander Shishkin if (nr_wins && msc->mode == MSC_MODE_SINGLE) { 1409ba82664cSAlexander Shishkin ret = -EINVAL; 1410ba82664cSAlexander Shishkin goto free_win; 1411ba82664cSAlexander Shishkin } 1412ba82664cSAlexander Shishkin 1413ba82664cSAlexander Shishkin nr_wins++; 1414ba82664cSAlexander Shishkin rewin = krealloc(win, sizeof(*win) * nr_wins, GFP_KERNEL); 1415ba82664cSAlexander Shishkin if (!rewin) { 1416ba82664cSAlexander Shishkin kfree(win); 1417ba82664cSAlexander Shishkin return -ENOMEM; 1418ba82664cSAlexander Shishkin } 1419ba82664cSAlexander Shishkin 1420ba82664cSAlexander Shishkin win = rewin; 1421ba82664cSAlexander Shishkin win[nr_wins - 1] = val; 1422ba82664cSAlexander Shishkin 1423ba82664cSAlexander Shishkin if (!end) 1424ba82664cSAlexander Shishkin break; 1425ba82664cSAlexander Shishkin 1426ba82664cSAlexander Shishkin len -= end - p; 1427ba82664cSAlexander Shishkin p = end + 1; 1428ba82664cSAlexander Shishkin } while (len); 1429ba82664cSAlexander Shishkin 1430ba82664cSAlexander Shishkin mutex_lock(&msc->buf_mutex); 1431ba82664cSAlexander Shishkin ret = msc_buffer_alloc(msc, win, nr_wins); 1432ba82664cSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 1433ba82664cSAlexander Shishkin 1434ba82664cSAlexander Shishkin free_win: 1435ba82664cSAlexander Shishkin kfree(win); 1436ba82664cSAlexander Shishkin 1437ba82664cSAlexander Shishkin return ret ? ret : size; 1438ba82664cSAlexander Shishkin } 1439ba82664cSAlexander Shishkin 1440ba82664cSAlexander Shishkin static DEVICE_ATTR_RW(nr_pages); 1441ba82664cSAlexander Shishkin 1442ba82664cSAlexander Shishkin static struct attribute *msc_output_attrs[] = { 1443ba82664cSAlexander Shishkin &dev_attr_wrap.attr, 1444ba82664cSAlexander Shishkin &dev_attr_mode.attr, 1445ba82664cSAlexander Shishkin &dev_attr_nr_pages.attr, 1446ba82664cSAlexander Shishkin NULL, 1447ba82664cSAlexander Shishkin }; 1448ba82664cSAlexander Shishkin 1449ba82664cSAlexander Shishkin static struct attribute_group msc_output_group = { 1450ba82664cSAlexander Shishkin .attrs = msc_output_attrs, 1451ba82664cSAlexander Shishkin }; 1452ba82664cSAlexander Shishkin 1453ba82664cSAlexander Shishkin static int intel_th_msc_probe(struct intel_th_device *thdev) 1454ba82664cSAlexander Shishkin { 1455ba82664cSAlexander Shishkin struct device *dev = &thdev->dev; 1456ba82664cSAlexander Shishkin struct resource *res; 1457ba82664cSAlexander Shishkin struct msc *msc; 1458ba82664cSAlexander Shishkin void __iomem *base; 1459ba82664cSAlexander Shishkin int err; 1460ba82664cSAlexander Shishkin 1461ba82664cSAlexander Shishkin res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 0); 1462ba82664cSAlexander Shishkin if (!res) 1463ba82664cSAlexander Shishkin return -ENODEV; 1464ba82664cSAlexander Shishkin 1465ba82664cSAlexander Shishkin base = devm_ioremap(dev, res->start, resource_size(res)); 146673061da0SDan Carpenter if (!base) 146773061da0SDan Carpenter return -ENOMEM; 1468ba82664cSAlexander Shishkin 1469ba82664cSAlexander Shishkin msc = devm_kzalloc(dev, sizeof(*msc), GFP_KERNEL); 1470ba82664cSAlexander Shishkin if (!msc) 1471ba82664cSAlexander Shishkin return -ENOMEM; 1472ba82664cSAlexander Shishkin 1473ba82664cSAlexander Shishkin msc->index = thdev->id; 1474ba82664cSAlexander Shishkin 1475ba82664cSAlexander Shishkin msc->thdev = thdev; 1476ba82664cSAlexander Shishkin msc->reg_base = base + msc->index * 0x100; 1477ba82664cSAlexander Shishkin 1478ba82664cSAlexander Shishkin err = intel_th_msc_init(msc); 1479ba82664cSAlexander Shishkin if (err) 1480ba82664cSAlexander Shishkin return err; 1481ba82664cSAlexander Shishkin 1482ba82664cSAlexander Shishkin dev_set_drvdata(dev, msc); 1483ba82664cSAlexander Shishkin 1484ba82664cSAlexander Shishkin return 0; 1485ba82664cSAlexander Shishkin } 1486ba82664cSAlexander Shishkin 1487ba82664cSAlexander Shishkin static void intel_th_msc_remove(struct intel_th_device *thdev) 1488ba82664cSAlexander Shishkin { 1489f152dfeeSAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 1490f152dfeeSAlexander Shishkin int ret; 1491f152dfeeSAlexander Shishkin 1492f152dfeeSAlexander Shishkin intel_th_msc_deactivate(thdev); 1493f152dfeeSAlexander Shishkin 1494f152dfeeSAlexander Shishkin /* 1495f152dfeeSAlexander Shishkin * Buffers should not be used at this point except if the 1496f152dfeeSAlexander Shishkin * output character device is still open and the parent 1497f152dfeeSAlexander Shishkin * device gets detached from its bus, which is a FIXME. 1498f152dfeeSAlexander Shishkin */ 1499f152dfeeSAlexander Shishkin ret = msc_buffer_free_unless_used(msc); 1500f152dfeeSAlexander Shishkin WARN_ON_ONCE(ret); 1501ba82664cSAlexander Shishkin } 1502ba82664cSAlexander Shishkin 1503ba82664cSAlexander Shishkin static struct intel_th_driver intel_th_msc_driver = { 1504ba82664cSAlexander Shishkin .probe = intel_th_msc_probe, 1505ba82664cSAlexander Shishkin .remove = intel_th_msc_remove, 1506ba82664cSAlexander Shishkin .activate = intel_th_msc_activate, 1507ba82664cSAlexander Shishkin .deactivate = intel_th_msc_deactivate, 1508ba82664cSAlexander Shishkin .fops = &intel_th_msc_fops, 15099d482aedSAlexander Shishkin .attr_group = &msc_output_group, 1510ba82664cSAlexander Shishkin .driver = { 1511ba82664cSAlexander Shishkin .name = "msc", 1512ba82664cSAlexander Shishkin .owner = THIS_MODULE, 1513ba82664cSAlexander Shishkin }, 1514ba82664cSAlexander Shishkin }; 1515ba82664cSAlexander Shishkin 1516ba82664cSAlexander Shishkin module_driver(intel_th_msc_driver, 1517ba82664cSAlexander Shishkin intel_th_driver_register, 1518ba82664cSAlexander Shishkin intel_th_driver_unregister); 1519ba82664cSAlexander Shishkin 1520ba82664cSAlexander Shishkin MODULE_LICENSE("GPL v2"); 1521ba82664cSAlexander Shishkin MODULE_DESCRIPTION("Intel(R) Trace Hub Memory Storage Unit driver"); 1522ba82664cSAlexander Shishkin MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>"); 1523