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_window - multiblock mode window descriptor 33ba82664cSAlexander Shishkin * @entry: window list linkage (msc::win_list) 34ba82664cSAlexander Shishkin * @pgoff: page offset into the buffer that this window starts at 35ba82664cSAlexander Shishkin * @nr_blocks: number of blocks (pages) in this window 36ba39bd83SAlexander Shishkin * @sgt: array of block descriptors 37ba82664cSAlexander Shishkin */ 38ba82664cSAlexander Shishkin struct msc_window { 39ba82664cSAlexander Shishkin struct list_head entry; 40ba82664cSAlexander Shishkin unsigned long pgoff; 41ba82664cSAlexander Shishkin unsigned int nr_blocks; 42ba82664cSAlexander Shishkin struct msc *msc; 43ba39bd83SAlexander Shishkin struct sg_table sgt; 44ba82664cSAlexander Shishkin }; 45ba82664cSAlexander Shishkin 46ba82664cSAlexander Shishkin /** 47ba82664cSAlexander Shishkin * struct msc_iter - iterator for msc buffer 48ba82664cSAlexander Shishkin * @entry: msc::iter_list linkage 49ba82664cSAlexander Shishkin * @msc: pointer to the MSC device 50ba82664cSAlexander Shishkin * @start_win: oldest window 51ba82664cSAlexander Shishkin * @win: current window 52ba82664cSAlexander Shishkin * @offset: current logical offset into the buffer 53ba82664cSAlexander Shishkin * @start_block: oldest block in the window 54ba82664cSAlexander Shishkin * @block: block number in the window 55ba82664cSAlexander Shishkin * @block_off: offset into current block 56ba82664cSAlexander Shishkin * @wrap_count: block wrapping handling 57ba82664cSAlexander Shishkin * @eof: end of buffer reached 58ba82664cSAlexander Shishkin */ 59ba82664cSAlexander Shishkin struct msc_iter { 60ba82664cSAlexander Shishkin struct list_head entry; 61ba82664cSAlexander Shishkin struct msc *msc; 62ba82664cSAlexander Shishkin struct msc_window *start_win; 63ba82664cSAlexander Shishkin struct msc_window *win; 64ba82664cSAlexander Shishkin unsigned long offset; 65ba82664cSAlexander Shishkin int start_block; 66ba82664cSAlexander Shishkin int block; 67ba82664cSAlexander Shishkin unsigned int block_off; 68ba82664cSAlexander Shishkin unsigned int wrap_count; 69ba82664cSAlexander Shishkin unsigned int eof; 70ba82664cSAlexander Shishkin }; 71ba82664cSAlexander Shishkin 72ba82664cSAlexander Shishkin /** 73ba82664cSAlexander Shishkin * struct msc - MSC device representation 74ba82664cSAlexander Shishkin * @reg_base: register window base address 75ba82664cSAlexander Shishkin * @thdev: intel_th_device pointer 76ba82664cSAlexander Shishkin * @win_list: list of windows in multiblock mode 774e0eaf23SAlexander Shishkin * @single_sgt: single mode buffer 78aad14ad3SAlexander Shishkin * @cur_win: current window 79ba82664cSAlexander Shishkin * @nr_pages: total number of pages allocated for this buffer 80ba82664cSAlexander Shishkin * @single_sz: amount of data in single mode 81ba82664cSAlexander Shishkin * @single_wrap: single mode wrap occurred 82ba82664cSAlexander Shishkin * @base: buffer's base pointer 83ba82664cSAlexander Shishkin * @base_addr: buffer's base address 84ba82664cSAlexander Shishkin * @user_count: number of users of the buffer 85ba82664cSAlexander Shishkin * @mmap_count: number of mappings 86ba82664cSAlexander Shishkin * @buf_mutex: mutex to serialize access to buffer-related bits 87ba82664cSAlexander Shishkin 88ba82664cSAlexander Shishkin * @enabled: MSC is enabled 89ba82664cSAlexander Shishkin * @wrap: wrapping is enabled 90ba82664cSAlexander Shishkin * @mode: MSC operating mode 91ba82664cSAlexander Shishkin * @burst_len: write burst length 92ba82664cSAlexander Shishkin * @index: number of this MSC in the MSU 93ba82664cSAlexander Shishkin */ 94ba82664cSAlexander Shishkin struct msc { 95ba82664cSAlexander Shishkin void __iomem *reg_base; 96aac8da65SAlexander Shishkin void __iomem *msu_base; 97ba82664cSAlexander Shishkin struct intel_th_device *thdev; 98ba82664cSAlexander Shishkin 99ba82664cSAlexander Shishkin struct list_head win_list; 1004e0eaf23SAlexander Shishkin struct sg_table single_sgt; 101aad14ad3SAlexander Shishkin struct msc_window *cur_win; 102ba82664cSAlexander Shishkin unsigned long nr_pages; 103ba82664cSAlexander Shishkin unsigned long single_sz; 104ba82664cSAlexander Shishkin unsigned int single_wrap : 1; 105ba82664cSAlexander Shishkin void *base; 106ba82664cSAlexander Shishkin dma_addr_t base_addr; 107ba82664cSAlexander Shishkin 108ba82664cSAlexander Shishkin /* <0: no buffer, 0: no users, >0: active users */ 109ba82664cSAlexander Shishkin atomic_t user_count; 110ba82664cSAlexander Shishkin 111ba82664cSAlexander Shishkin atomic_t mmap_count; 112ba82664cSAlexander Shishkin struct mutex buf_mutex; 113ba82664cSAlexander Shishkin 114ba82664cSAlexander Shishkin struct list_head iter_list; 115ba82664cSAlexander Shishkin 116ba82664cSAlexander Shishkin /* config */ 117ba82664cSAlexander Shishkin unsigned int enabled : 1, 118aac8da65SAlexander Shishkin wrap : 1, 119aac8da65SAlexander Shishkin do_irq : 1; 120ba82664cSAlexander Shishkin unsigned int mode; 121ba82664cSAlexander Shishkin unsigned int burst_len; 122ba82664cSAlexander Shishkin unsigned int index; 123ba82664cSAlexander Shishkin }; 124ba82664cSAlexander Shishkin 125ba82664cSAlexander Shishkin static inline bool msc_block_is_empty(struct msc_block_desc *bdesc) 126ba82664cSAlexander Shishkin { 127ba82664cSAlexander Shishkin /* header hasn't been written */ 128ba82664cSAlexander Shishkin if (!bdesc->valid_dw) 129ba82664cSAlexander Shishkin return true; 130ba82664cSAlexander Shishkin 131ba82664cSAlexander Shishkin /* valid_dw includes the header */ 132ba82664cSAlexander Shishkin if (!msc_data_sz(bdesc)) 133ba82664cSAlexander Shishkin return true; 134ba82664cSAlexander Shishkin 135ba82664cSAlexander Shishkin return false; 136ba82664cSAlexander Shishkin } 137ba82664cSAlexander Shishkin 138ba39bd83SAlexander Shishkin static inline struct msc_block_desc * 139ba39bd83SAlexander Shishkin msc_win_block(struct msc_window *win, unsigned int block) 140ba39bd83SAlexander Shishkin { 141ba39bd83SAlexander Shishkin return sg_virt(&win->sgt.sgl[block]); 142ba39bd83SAlexander Shishkin } 143ba39bd83SAlexander Shishkin 144ba39bd83SAlexander Shishkin static inline dma_addr_t 145ba39bd83SAlexander Shishkin msc_win_baddr(struct msc_window *win, unsigned int block) 146ba39bd83SAlexander Shishkin { 147ba39bd83SAlexander Shishkin return sg_dma_address(&win->sgt.sgl[block]); 148ba39bd83SAlexander Shishkin } 149ba39bd83SAlexander Shishkin 150ba39bd83SAlexander Shishkin static inline unsigned long 151ba39bd83SAlexander Shishkin msc_win_bpfn(struct msc_window *win, unsigned int block) 152ba39bd83SAlexander Shishkin { 153ba39bd83SAlexander Shishkin return msc_win_baddr(win, block) >> PAGE_SHIFT; 154ba39bd83SAlexander Shishkin } 155ba39bd83SAlexander Shishkin 156ba82664cSAlexander Shishkin /** 157aad14ad3SAlexander Shishkin * msc_is_last_win() - check if a window is the last one for a given MSC 158aad14ad3SAlexander Shishkin * @win: window 159aad14ad3SAlexander Shishkin * Return: true if @win is the last window in MSC's multiblock buffer 160aad14ad3SAlexander Shishkin */ 161aad14ad3SAlexander Shishkin static inline bool msc_is_last_win(struct msc_window *win) 162aad14ad3SAlexander Shishkin { 163aad14ad3SAlexander Shishkin return win->entry.next == &win->msc->win_list; 164aad14ad3SAlexander Shishkin } 165aad14ad3SAlexander Shishkin 166aad14ad3SAlexander Shishkin /** 167aad14ad3SAlexander Shishkin * msc_next_window() - return next window in the multiblock buffer 168aad14ad3SAlexander Shishkin * @win: current window 169aad14ad3SAlexander Shishkin * 170aad14ad3SAlexander Shishkin * Return: window following the current one 171aad14ad3SAlexander Shishkin */ 172aad14ad3SAlexander Shishkin static struct msc_window *msc_next_window(struct msc_window *win) 173aad14ad3SAlexander Shishkin { 174aad14ad3SAlexander Shishkin if (msc_is_last_win(win)) 175aad14ad3SAlexander Shishkin return list_first_entry(&win->msc->win_list, struct msc_window, 176aad14ad3SAlexander Shishkin entry); 177aad14ad3SAlexander Shishkin 178aad14ad3SAlexander Shishkin return list_next_entry(win, entry); 179aad14ad3SAlexander Shishkin } 180aad14ad3SAlexander Shishkin 181aad14ad3SAlexander Shishkin /** 182ba82664cSAlexander Shishkin * msc_oldest_window() - locate the window with oldest data 183ba82664cSAlexander Shishkin * @msc: MSC device 184ba82664cSAlexander Shishkin * 185ba82664cSAlexander Shishkin * This should only be used in multiblock mode. Caller should hold the 186ba82664cSAlexander Shishkin * msc::user_count reference. 187ba82664cSAlexander Shishkin * 188ba82664cSAlexander Shishkin * Return: the oldest window with valid data 189ba82664cSAlexander Shishkin */ 190ba82664cSAlexander Shishkin static struct msc_window *msc_oldest_window(struct msc *msc) 191ba82664cSAlexander Shishkin { 192aad14ad3SAlexander Shishkin struct msc_window *win, *next = msc_next_window(msc->cur_win); 193ba82664cSAlexander Shishkin unsigned int found = 0; 194ba82664cSAlexander Shishkin 195ba82664cSAlexander Shishkin if (list_empty(&msc->win_list)) 196ba82664cSAlexander Shishkin return NULL; 197ba82664cSAlexander Shishkin 198ba82664cSAlexander Shishkin /* 199ba82664cSAlexander Shishkin * we might need a radix tree for this, depending on how 200ba82664cSAlexander Shishkin * many windows a typical user would allocate; ideally it's 201ba82664cSAlexander Shishkin * something like 2, in which case we're good 202ba82664cSAlexander Shishkin */ 203ba82664cSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) { 204aad14ad3SAlexander Shishkin if (win == next) 205ba82664cSAlexander Shishkin found++; 206ba82664cSAlexander Shishkin 207ba82664cSAlexander Shishkin /* skip the empty ones */ 208ba39bd83SAlexander Shishkin if (msc_block_is_empty(msc_win_block(win, 0))) 209ba82664cSAlexander Shishkin continue; 210ba82664cSAlexander Shishkin 211ba82664cSAlexander Shishkin if (found) 212ba82664cSAlexander Shishkin return win; 213ba82664cSAlexander Shishkin } 214ba82664cSAlexander Shishkin 2150de9e035SAlexander Shishkin return list_first_entry(&msc->win_list, struct msc_window, entry); 216ba82664cSAlexander Shishkin } 217ba82664cSAlexander Shishkin 218ba82664cSAlexander Shishkin /** 219ba82664cSAlexander Shishkin * msc_win_oldest_block() - locate the oldest block in a given window 220ba82664cSAlexander Shishkin * @win: window to look at 221ba82664cSAlexander Shishkin * 222ba82664cSAlexander Shishkin * Return: index of the block with the oldest data 223ba82664cSAlexander Shishkin */ 224ba82664cSAlexander Shishkin static unsigned int msc_win_oldest_block(struct msc_window *win) 225ba82664cSAlexander Shishkin { 226ba82664cSAlexander Shishkin unsigned int blk; 227ba39bd83SAlexander Shishkin struct msc_block_desc *bdesc = msc_win_block(win, 0); 228ba82664cSAlexander Shishkin 229ba82664cSAlexander Shishkin /* without wrapping, first block is the oldest */ 230ba82664cSAlexander Shishkin if (!msc_block_wrapped(bdesc)) 231ba82664cSAlexander Shishkin return 0; 232ba82664cSAlexander Shishkin 233ba82664cSAlexander Shishkin /* 234ba82664cSAlexander Shishkin * with wrapping, last written block contains both the newest and the 235ba82664cSAlexander Shishkin * oldest data for this window. 236ba82664cSAlexander Shishkin */ 237ba82664cSAlexander Shishkin for (blk = 0; blk < win->nr_blocks; blk++) { 238ba39bd83SAlexander Shishkin bdesc = msc_win_block(win, blk); 239ba82664cSAlexander Shishkin 240ba82664cSAlexander Shishkin if (msc_block_last_written(bdesc)) 241ba82664cSAlexander Shishkin return blk; 242ba82664cSAlexander Shishkin } 243ba82664cSAlexander Shishkin 244ba82664cSAlexander Shishkin return 0; 245ba82664cSAlexander Shishkin } 246ba82664cSAlexander Shishkin 247ba82664cSAlexander Shishkin static struct msc_block_desc *msc_iter_bdesc(struct msc_iter *iter) 248ba82664cSAlexander Shishkin { 249ba39bd83SAlexander Shishkin return msc_win_block(iter->win, iter->block); 250ba82664cSAlexander Shishkin } 251ba82664cSAlexander Shishkin 252ba82664cSAlexander Shishkin static void msc_iter_init(struct msc_iter *iter) 253ba82664cSAlexander Shishkin { 254ba82664cSAlexander Shishkin memset(iter, 0, sizeof(*iter)); 255ba82664cSAlexander Shishkin iter->start_block = -1; 256ba82664cSAlexander Shishkin iter->block = -1; 257ba82664cSAlexander Shishkin } 258ba82664cSAlexander Shishkin 259ba82664cSAlexander Shishkin static struct msc_iter *msc_iter_install(struct msc *msc) 260ba82664cSAlexander Shishkin { 261ba82664cSAlexander Shishkin struct msc_iter *iter; 262ba82664cSAlexander Shishkin 263ba82664cSAlexander Shishkin iter = kzalloc(sizeof(*iter), GFP_KERNEL); 264ba82664cSAlexander Shishkin if (!iter) 265a45ff6edSAlexander Shishkin return ERR_PTR(-ENOMEM); 266a45ff6edSAlexander Shishkin 267a45ff6edSAlexander Shishkin mutex_lock(&msc->buf_mutex); 268a45ff6edSAlexander Shishkin 269a45ff6edSAlexander Shishkin /* 270a45ff6edSAlexander Shishkin * Reading and tracing are mutually exclusive; if msc is 271a45ff6edSAlexander Shishkin * enabled, open() will fail; otherwise existing readers 272a45ff6edSAlexander Shishkin * will prevent enabling the msc and the rest of fops don't 273a45ff6edSAlexander Shishkin * need to worry about it. 274a45ff6edSAlexander Shishkin */ 275a45ff6edSAlexander Shishkin if (msc->enabled) { 276a45ff6edSAlexander Shishkin kfree(iter); 277a45ff6edSAlexander Shishkin iter = ERR_PTR(-EBUSY); 278a45ff6edSAlexander Shishkin goto unlock; 279a45ff6edSAlexander Shishkin } 280ba82664cSAlexander Shishkin 281ba82664cSAlexander Shishkin msc_iter_init(iter); 282ba82664cSAlexander Shishkin iter->msc = msc; 283ba82664cSAlexander Shishkin 284ba82664cSAlexander Shishkin list_add_tail(&iter->entry, &msc->iter_list); 285a45ff6edSAlexander Shishkin unlock: 286a45ff6edSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 287ba82664cSAlexander Shishkin 288ba82664cSAlexander Shishkin return iter; 289ba82664cSAlexander Shishkin } 290ba82664cSAlexander Shishkin 291ba82664cSAlexander Shishkin static void msc_iter_remove(struct msc_iter *iter, struct msc *msc) 292ba82664cSAlexander Shishkin { 293a45ff6edSAlexander Shishkin mutex_lock(&msc->buf_mutex); 294ba82664cSAlexander Shishkin list_del(&iter->entry); 295a45ff6edSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 296ba82664cSAlexander Shishkin 297ba82664cSAlexander Shishkin kfree(iter); 298ba82664cSAlexander Shishkin } 299ba82664cSAlexander Shishkin 300ba82664cSAlexander Shishkin static void msc_iter_block_start(struct msc_iter *iter) 301ba82664cSAlexander Shishkin { 302ba82664cSAlexander Shishkin if (iter->start_block != -1) 303ba82664cSAlexander Shishkin return; 304ba82664cSAlexander Shishkin 305ba82664cSAlexander Shishkin iter->start_block = msc_win_oldest_block(iter->win); 306ba82664cSAlexander Shishkin iter->block = iter->start_block; 307ba82664cSAlexander Shishkin iter->wrap_count = 0; 308ba82664cSAlexander Shishkin 309ba82664cSAlexander Shishkin /* 310ba82664cSAlexander Shishkin * start with the block with oldest data; if data has wrapped 311ba82664cSAlexander Shishkin * in this window, it should be in this block 312ba82664cSAlexander Shishkin */ 313ba82664cSAlexander Shishkin if (msc_block_wrapped(msc_iter_bdesc(iter))) 314ba82664cSAlexander Shishkin iter->wrap_count = 2; 315ba82664cSAlexander Shishkin 316ba82664cSAlexander Shishkin } 317ba82664cSAlexander Shishkin 318ba82664cSAlexander Shishkin static int msc_iter_win_start(struct msc_iter *iter, struct msc *msc) 319ba82664cSAlexander Shishkin { 320ba82664cSAlexander Shishkin /* already started, nothing to do */ 321ba82664cSAlexander Shishkin if (iter->start_win) 322ba82664cSAlexander Shishkin return 0; 323ba82664cSAlexander Shishkin 324ba82664cSAlexander Shishkin iter->start_win = msc_oldest_window(msc); 325ba82664cSAlexander Shishkin if (!iter->start_win) 326ba82664cSAlexander Shishkin return -EINVAL; 327ba82664cSAlexander Shishkin 328ba82664cSAlexander Shishkin iter->win = iter->start_win; 329ba82664cSAlexander Shishkin iter->start_block = -1; 330ba82664cSAlexander Shishkin 331ba82664cSAlexander Shishkin msc_iter_block_start(iter); 332ba82664cSAlexander Shishkin 333ba82664cSAlexander Shishkin return 0; 334ba82664cSAlexander Shishkin } 335ba82664cSAlexander Shishkin 336ba82664cSAlexander Shishkin static int msc_iter_win_advance(struct msc_iter *iter) 337ba82664cSAlexander Shishkin { 338ba82664cSAlexander Shishkin iter->win = msc_next_window(iter->win); 339ba82664cSAlexander Shishkin iter->start_block = -1; 340ba82664cSAlexander Shishkin 341ba82664cSAlexander Shishkin if (iter->win == iter->start_win) { 342ba82664cSAlexander Shishkin iter->eof++; 343ba82664cSAlexander Shishkin return 1; 344ba82664cSAlexander Shishkin } 345ba82664cSAlexander Shishkin 346ba82664cSAlexander Shishkin msc_iter_block_start(iter); 347ba82664cSAlexander Shishkin 348ba82664cSAlexander Shishkin return 0; 349ba82664cSAlexander Shishkin } 350ba82664cSAlexander Shishkin 351ba82664cSAlexander Shishkin static int msc_iter_block_advance(struct msc_iter *iter) 352ba82664cSAlexander Shishkin { 353ba82664cSAlexander Shishkin iter->block_off = 0; 354ba82664cSAlexander Shishkin 355ba82664cSAlexander Shishkin /* wrapping */ 356ba82664cSAlexander Shishkin if (iter->wrap_count && iter->block == iter->start_block) { 357ba82664cSAlexander Shishkin iter->wrap_count--; 358ba82664cSAlexander Shishkin if (!iter->wrap_count) 359ba82664cSAlexander Shishkin /* copied newest data from the wrapped block */ 360ba82664cSAlexander Shishkin return msc_iter_win_advance(iter); 361ba82664cSAlexander Shishkin } 362ba82664cSAlexander Shishkin 363ba82664cSAlexander Shishkin /* no wrapping, check for last written block */ 364ba82664cSAlexander Shishkin if (!iter->wrap_count && msc_block_last_written(msc_iter_bdesc(iter))) 365ba82664cSAlexander Shishkin /* copied newest data for the window */ 366ba82664cSAlexander Shishkin return msc_iter_win_advance(iter); 367ba82664cSAlexander Shishkin 368ba82664cSAlexander Shishkin /* block advance */ 369ba82664cSAlexander Shishkin if (++iter->block == iter->win->nr_blocks) 370ba82664cSAlexander Shishkin iter->block = 0; 371ba82664cSAlexander Shishkin 372ba82664cSAlexander Shishkin /* no wrapping, sanity check in case there is no last written block */ 373ba82664cSAlexander Shishkin if (!iter->wrap_count && iter->block == iter->start_block) 374ba82664cSAlexander Shishkin return msc_iter_win_advance(iter); 375ba82664cSAlexander Shishkin 376ba82664cSAlexander Shishkin return 0; 377ba82664cSAlexander Shishkin } 378ba82664cSAlexander Shishkin 379ba82664cSAlexander Shishkin /** 380ba82664cSAlexander Shishkin * msc_buffer_iterate() - go through multiblock buffer's data 381ba82664cSAlexander Shishkin * @iter: iterator structure 382ba82664cSAlexander Shishkin * @size: amount of data to scan 383ba82664cSAlexander Shishkin * @data: callback's private data 384ba82664cSAlexander Shishkin * @fn: iterator callback 385ba82664cSAlexander Shishkin * 386ba82664cSAlexander Shishkin * This will start at the window which will be written to next (containing 387ba82664cSAlexander Shishkin * the oldest data) and work its way to the current window, calling @fn 388ba82664cSAlexander Shishkin * for each chunk of data as it goes. 389ba82664cSAlexander Shishkin * 390ba82664cSAlexander Shishkin * Caller should have msc::user_count reference to make sure the buffer 391ba82664cSAlexander Shishkin * doesn't disappear from under us. 392ba82664cSAlexander Shishkin * 393ba82664cSAlexander Shishkin * Return: amount of data actually scanned. 394ba82664cSAlexander Shishkin */ 395ba82664cSAlexander Shishkin static ssize_t 396ba82664cSAlexander Shishkin msc_buffer_iterate(struct msc_iter *iter, size_t size, void *data, 397ba82664cSAlexander Shishkin unsigned long (*fn)(void *, void *, size_t)) 398ba82664cSAlexander Shishkin { 399ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 400ba82664cSAlexander Shishkin size_t len = size; 401ba82664cSAlexander Shishkin unsigned int advance; 402ba82664cSAlexander Shishkin 403ba82664cSAlexander Shishkin if (iter->eof) 404ba82664cSAlexander Shishkin return 0; 405ba82664cSAlexander Shishkin 406ba82664cSAlexander Shishkin /* start with the oldest window */ 407ba82664cSAlexander Shishkin if (msc_iter_win_start(iter, msc)) 408ba82664cSAlexander Shishkin return 0; 409ba82664cSAlexander Shishkin 410ba82664cSAlexander Shishkin do { 411ba82664cSAlexander Shishkin unsigned long data_bytes = msc_data_sz(msc_iter_bdesc(iter)); 412ba82664cSAlexander Shishkin void *src = (void *)msc_iter_bdesc(iter) + MSC_BDESC; 413ba82664cSAlexander Shishkin size_t tocopy = data_bytes, copied = 0; 414ba82664cSAlexander Shishkin size_t remaining = 0; 415ba82664cSAlexander Shishkin 416ba82664cSAlexander Shishkin advance = 1; 417ba82664cSAlexander Shishkin 418ba82664cSAlexander Shishkin /* 419ba82664cSAlexander Shishkin * If block wrapping happened, we need to visit the last block 420ba82664cSAlexander Shishkin * twice, because it contains both the oldest and the newest 421ba82664cSAlexander Shishkin * data in this window. 422ba82664cSAlexander Shishkin * 423ba82664cSAlexander Shishkin * First time (wrap_count==2), in the very beginning, to collect 424ba82664cSAlexander Shishkin * the oldest data, which is in the range 425ba82664cSAlexander Shishkin * (data_bytes..DATA_IN_PAGE). 426ba82664cSAlexander Shishkin * 427ba82664cSAlexander Shishkin * Second time (wrap_count==1), it's just like any other block, 428ba82664cSAlexander Shishkin * containing data in the range of [MSC_BDESC..data_bytes]. 429ba82664cSAlexander Shishkin */ 430e4eca2a1SLaurent FERT if (iter->block == iter->start_block && iter->wrap_count == 2) { 431ba82664cSAlexander Shishkin tocopy = DATA_IN_PAGE - data_bytes; 432ba82664cSAlexander Shishkin src += data_bytes; 433ba82664cSAlexander Shishkin } 434ba82664cSAlexander Shishkin 435ba82664cSAlexander Shishkin if (!tocopy) 436ba82664cSAlexander Shishkin goto next_block; 437ba82664cSAlexander Shishkin 438ba82664cSAlexander Shishkin tocopy -= iter->block_off; 439ba82664cSAlexander Shishkin src += iter->block_off; 440ba82664cSAlexander Shishkin 441ba82664cSAlexander Shishkin if (len < tocopy) { 442ba82664cSAlexander Shishkin tocopy = len; 443ba82664cSAlexander Shishkin advance = 0; 444ba82664cSAlexander Shishkin } 445ba82664cSAlexander Shishkin 446ba82664cSAlexander Shishkin remaining = fn(data, src, tocopy); 447ba82664cSAlexander Shishkin 448ba82664cSAlexander Shishkin if (remaining) 449ba82664cSAlexander Shishkin advance = 0; 450ba82664cSAlexander Shishkin 451ba82664cSAlexander Shishkin copied = tocopy - remaining; 452ba82664cSAlexander Shishkin len -= copied; 453ba82664cSAlexander Shishkin iter->block_off += copied; 454ba82664cSAlexander Shishkin iter->offset += copied; 455ba82664cSAlexander Shishkin 456ba82664cSAlexander Shishkin if (!advance) 457ba82664cSAlexander Shishkin break; 458ba82664cSAlexander Shishkin 459ba82664cSAlexander Shishkin next_block: 460ba82664cSAlexander Shishkin if (msc_iter_block_advance(iter)) 461ba82664cSAlexander Shishkin break; 462ba82664cSAlexander Shishkin 463ba82664cSAlexander Shishkin } while (len); 464ba82664cSAlexander Shishkin 465ba82664cSAlexander Shishkin return size - len; 466ba82664cSAlexander Shishkin } 467ba82664cSAlexander Shishkin 468ba82664cSAlexander Shishkin /** 469ba82664cSAlexander Shishkin * msc_buffer_clear_hw_header() - clear hw header for multiblock 470ba82664cSAlexander Shishkin * @msc: MSC device 471ba82664cSAlexander Shishkin */ 472ba82664cSAlexander Shishkin static void msc_buffer_clear_hw_header(struct msc *msc) 473ba82664cSAlexander Shishkin { 474ba82664cSAlexander Shishkin struct msc_window *win; 475ba82664cSAlexander Shishkin 476ba82664cSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) { 477ba82664cSAlexander Shishkin unsigned int blk; 478ba82664cSAlexander Shishkin size_t hw_sz = sizeof(struct msc_block_desc) - 479ba82664cSAlexander Shishkin offsetof(struct msc_block_desc, hw_tag); 480ba82664cSAlexander Shishkin 481ba82664cSAlexander Shishkin for (blk = 0; blk < win->nr_blocks; blk++) { 482ba39bd83SAlexander Shishkin struct msc_block_desc *bdesc = msc_win_block(win, blk); 483ba82664cSAlexander Shishkin 484ba82664cSAlexander Shishkin memset(&bdesc->hw_tag, 0, hw_sz); 485ba82664cSAlexander Shishkin } 486ba82664cSAlexander Shishkin } 487ba82664cSAlexander Shishkin } 488ba82664cSAlexander Shishkin 489aac8da65SAlexander Shishkin static int intel_th_msu_init(struct msc *msc) 490aac8da65SAlexander Shishkin { 491aac8da65SAlexander Shishkin u32 mintctl, msusts; 492aac8da65SAlexander Shishkin 493aac8da65SAlexander Shishkin if (!msc->do_irq) 494aac8da65SAlexander Shishkin return 0; 495aac8da65SAlexander Shishkin 496aac8da65SAlexander Shishkin mintctl = ioread32(msc->msu_base + REG_MSU_MINTCTL); 497aac8da65SAlexander Shishkin mintctl |= msc->index ? M1BLIE : M0BLIE; 498aac8da65SAlexander Shishkin iowrite32(mintctl, msc->msu_base + REG_MSU_MINTCTL); 499aac8da65SAlexander Shishkin if (mintctl != ioread32(msc->msu_base + REG_MSU_MINTCTL)) { 500aac8da65SAlexander Shishkin dev_info(msc_dev(msc), "MINTCTL ignores writes: no usable interrupts\n"); 501aac8da65SAlexander Shishkin msc->do_irq = 0; 502aac8da65SAlexander Shishkin return 0; 503aac8da65SAlexander Shishkin } 504aac8da65SAlexander Shishkin 505aac8da65SAlexander Shishkin msusts = ioread32(msc->msu_base + REG_MSU_MSUSTS); 506aac8da65SAlexander Shishkin iowrite32(msusts, msc->msu_base + REG_MSU_MSUSTS); 507aac8da65SAlexander Shishkin 508aac8da65SAlexander Shishkin return 0; 509aac8da65SAlexander Shishkin } 510aac8da65SAlexander Shishkin 511aac8da65SAlexander Shishkin static void intel_th_msu_deinit(struct msc *msc) 512aac8da65SAlexander Shishkin { 513aac8da65SAlexander Shishkin u32 mintctl; 514aac8da65SAlexander Shishkin 515aac8da65SAlexander Shishkin if (!msc->do_irq) 516aac8da65SAlexander Shishkin return; 517aac8da65SAlexander Shishkin 518aac8da65SAlexander Shishkin mintctl = ioread32(msc->msu_base + REG_MSU_MINTCTL); 519aac8da65SAlexander Shishkin mintctl &= msc->index ? ~M1BLIE : ~M0BLIE; 520aac8da65SAlexander Shishkin iowrite32(mintctl, msc->msu_base + REG_MSU_MINTCTL); 521aac8da65SAlexander Shishkin } 522aac8da65SAlexander Shishkin 523ba82664cSAlexander Shishkin /** 524ba82664cSAlexander Shishkin * msc_configure() - set up MSC hardware 525ba82664cSAlexander Shishkin * @msc: the MSC device to configure 526ba82664cSAlexander Shishkin * 527ba82664cSAlexander Shishkin * Program storage mode, wrapping, burst length and trace buffer address 528a45ff6edSAlexander Shishkin * into a given MSC. Then, enable tracing and set msc::enabled. 529a45ff6edSAlexander Shishkin * The latter is serialized on msc::buf_mutex, so make sure to hold it. 530ba82664cSAlexander Shishkin */ 531ba82664cSAlexander Shishkin static int msc_configure(struct msc *msc) 532ba82664cSAlexander Shishkin { 533ba82664cSAlexander Shishkin u32 reg; 534ba82664cSAlexander Shishkin 535a45ff6edSAlexander Shishkin lockdep_assert_held(&msc->buf_mutex); 536a45ff6edSAlexander Shishkin 537ba82664cSAlexander Shishkin if (msc->mode > MSC_MODE_MULTI) 538ba82664cSAlexander Shishkin return -ENOTSUPP; 539ba82664cSAlexander Shishkin 540ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_MULTI) 541ba82664cSAlexander Shishkin msc_buffer_clear_hw_header(msc); 542ba82664cSAlexander Shishkin 543ba82664cSAlexander Shishkin reg = msc->base_addr >> PAGE_SHIFT; 544ba82664cSAlexander Shishkin iowrite32(reg, msc->reg_base + REG_MSU_MSC0BAR); 545ba82664cSAlexander Shishkin 546ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) { 547ba82664cSAlexander Shishkin reg = msc->nr_pages; 548ba82664cSAlexander Shishkin iowrite32(reg, msc->reg_base + REG_MSU_MSC0SIZE); 549ba82664cSAlexander Shishkin } 550ba82664cSAlexander Shishkin 551ba82664cSAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSC0CTL); 552ba82664cSAlexander Shishkin reg &= ~(MSC_MODE | MSC_WRAPEN | MSC_EN | MSC_RD_HDR_OVRD); 553ba82664cSAlexander Shishkin 554a45ff6edSAlexander Shishkin reg |= MSC_EN; 555ba82664cSAlexander Shishkin reg |= msc->mode << __ffs(MSC_MODE); 556ba82664cSAlexander Shishkin reg |= msc->burst_len << __ffs(MSC_LEN); 557a45ff6edSAlexander Shishkin 558ba82664cSAlexander Shishkin if (msc->wrap) 559ba82664cSAlexander Shishkin reg |= MSC_WRAPEN; 560ba82664cSAlexander Shishkin 561ba82664cSAlexander Shishkin iowrite32(reg, msc->reg_base + REG_MSU_MSC0CTL); 562ba82664cSAlexander Shishkin 563ba82664cSAlexander Shishkin msc->thdev->output.multiblock = msc->mode == MSC_MODE_MULTI; 564ba82664cSAlexander Shishkin intel_th_trace_enable(msc->thdev); 565a45ff6edSAlexander Shishkin msc->enabled = 1; 566a45ff6edSAlexander Shishkin 567ba82664cSAlexander Shishkin 568ba82664cSAlexander Shishkin return 0; 569ba82664cSAlexander Shishkin } 570ba82664cSAlexander Shishkin 571ba82664cSAlexander Shishkin /** 572ba82664cSAlexander Shishkin * msc_disable() - disable MSC hardware 573ba82664cSAlexander Shishkin * @msc: MSC device to disable 574ba82664cSAlexander Shishkin * 575ba82664cSAlexander Shishkin * If @msc is enabled, disable tracing on the switch and then disable MSC 576a45ff6edSAlexander Shishkin * storage. Caller must hold msc::buf_mutex. 577ba82664cSAlexander Shishkin */ 578ba82664cSAlexander Shishkin static void msc_disable(struct msc *msc) 579ba82664cSAlexander Shishkin { 580ba82664cSAlexander Shishkin u32 reg; 581ba82664cSAlexander Shishkin 582a45ff6edSAlexander Shishkin lockdep_assert_held(&msc->buf_mutex); 583ba82664cSAlexander Shishkin 584ba82664cSAlexander Shishkin intel_th_trace_disable(msc->thdev); 585ba82664cSAlexander Shishkin 586ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) { 5878d415512SAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSC0STS); 588ba82664cSAlexander Shishkin msc->single_wrap = !!(reg & MSCSTS_WRAPSTAT); 589ba82664cSAlexander Shishkin 590ba82664cSAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSC0MWP); 591ba82664cSAlexander Shishkin msc->single_sz = reg & ((msc->nr_pages << PAGE_SHIFT) - 1); 592ba82664cSAlexander Shishkin dev_dbg(msc_dev(msc), "MSCnMWP: %08x/%08lx, wrap: %d\n", 593ba82664cSAlexander Shishkin reg, msc->single_sz, msc->single_wrap); 594ba82664cSAlexander Shishkin } 595ba82664cSAlexander Shishkin 596ba82664cSAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSC0CTL); 597ba82664cSAlexander Shishkin reg &= ~MSC_EN; 598ba82664cSAlexander Shishkin iowrite32(reg, msc->reg_base + REG_MSU_MSC0CTL); 599ba82664cSAlexander Shishkin msc->enabled = 0; 600ba82664cSAlexander Shishkin 601ba82664cSAlexander Shishkin iowrite32(0, msc->reg_base + REG_MSU_MSC0BAR); 602ba82664cSAlexander Shishkin iowrite32(0, msc->reg_base + REG_MSU_MSC0SIZE); 603ba82664cSAlexander Shishkin 604ba82664cSAlexander Shishkin dev_dbg(msc_dev(msc), "MSCnNWSA: %08x\n", 605ba82664cSAlexander Shishkin ioread32(msc->reg_base + REG_MSU_MSC0NWSA)); 606ba82664cSAlexander Shishkin 607ba82664cSAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSC0STS); 608ba82664cSAlexander Shishkin dev_dbg(msc_dev(msc), "MSCnSTS: %08x\n", reg); 609ba82664cSAlexander Shishkin } 610ba82664cSAlexander Shishkin 611ba82664cSAlexander Shishkin static int intel_th_msc_activate(struct intel_th_device *thdev) 612ba82664cSAlexander Shishkin { 613ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 614a45ff6edSAlexander Shishkin int ret = -EBUSY; 615ba82664cSAlexander Shishkin 616ba82664cSAlexander Shishkin if (!atomic_inc_unless_negative(&msc->user_count)) 617ba82664cSAlexander Shishkin return -ENODEV; 618ba82664cSAlexander Shishkin 619a45ff6edSAlexander Shishkin mutex_lock(&msc->buf_mutex); 620ba82664cSAlexander Shishkin 621a45ff6edSAlexander Shishkin /* if there are readers, refuse */ 622a45ff6edSAlexander Shishkin if (list_empty(&msc->iter_list)) 623a45ff6edSAlexander Shishkin ret = msc_configure(msc); 624a45ff6edSAlexander Shishkin 625a45ff6edSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 626a45ff6edSAlexander Shishkin 627a45ff6edSAlexander Shishkin if (ret) 628ba82664cSAlexander Shishkin atomic_dec(&msc->user_count); 629a45ff6edSAlexander Shishkin 630ba82664cSAlexander Shishkin return ret; 631ba82664cSAlexander Shishkin } 632ba82664cSAlexander Shishkin 633ba82664cSAlexander Shishkin static void intel_th_msc_deactivate(struct intel_th_device *thdev) 634ba82664cSAlexander Shishkin { 635ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 636ba82664cSAlexander Shishkin 637a45ff6edSAlexander Shishkin mutex_lock(&msc->buf_mutex); 638a45ff6edSAlexander Shishkin if (msc->enabled) { 639ba82664cSAlexander Shishkin msc_disable(msc); 640ba82664cSAlexander Shishkin atomic_dec(&msc->user_count); 641ba82664cSAlexander Shishkin } 642a45ff6edSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 643a45ff6edSAlexander Shishkin } 644ba82664cSAlexander Shishkin 645ba82664cSAlexander Shishkin /** 646ba82664cSAlexander Shishkin * msc_buffer_contig_alloc() - allocate a contiguous buffer for SINGLE mode 647ba82664cSAlexander Shishkin * @msc: MSC device 648ba82664cSAlexander Shishkin * @size: allocation size in bytes 649ba82664cSAlexander Shishkin * 650ba82664cSAlexander Shishkin * This modifies msc::base, which requires msc::buf_mutex to serialize, so the 651ba82664cSAlexander Shishkin * caller is expected to hold it. 652ba82664cSAlexander Shishkin * 653ba82664cSAlexander Shishkin * Return: 0 on success, -errno otherwise. 654ba82664cSAlexander Shishkin */ 655ba82664cSAlexander Shishkin static int msc_buffer_contig_alloc(struct msc *msc, unsigned long size) 656ba82664cSAlexander Shishkin { 6574e0eaf23SAlexander Shishkin unsigned long nr_pages = size >> PAGE_SHIFT; 658ba82664cSAlexander Shishkin unsigned int order = get_order(size); 659ba82664cSAlexander Shishkin struct page *page; 6604e0eaf23SAlexander Shishkin int ret; 661ba82664cSAlexander Shishkin 662ba82664cSAlexander Shishkin if (!size) 663ba82664cSAlexander Shishkin return 0; 664ba82664cSAlexander Shishkin 6654e0eaf23SAlexander Shishkin ret = sg_alloc_table(&msc->single_sgt, 1, GFP_KERNEL); 6664e0eaf23SAlexander Shishkin if (ret) 6674e0eaf23SAlexander Shishkin goto err_out; 6684e0eaf23SAlexander Shishkin 6694e0eaf23SAlexander Shishkin ret = -ENOMEM; 670ba82664cSAlexander Shishkin page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order); 671ba82664cSAlexander Shishkin if (!page) 6724e0eaf23SAlexander Shishkin goto err_free_sgt; 673ba82664cSAlexander Shishkin 674ba82664cSAlexander Shishkin split_page(page, order); 6754e0eaf23SAlexander Shishkin sg_set_buf(msc->single_sgt.sgl, page_address(page), size); 6764e0eaf23SAlexander Shishkin 6774e0eaf23SAlexander Shishkin ret = dma_map_sg(msc_dev(msc)->parent->parent, msc->single_sgt.sgl, 1, 6784e0eaf23SAlexander Shishkin DMA_FROM_DEVICE); 6794e0eaf23SAlexander Shishkin if (ret < 0) 6804e0eaf23SAlexander Shishkin goto err_free_pages; 6814e0eaf23SAlexander Shishkin 6824e0eaf23SAlexander Shishkin msc->nr_pages = nr_pages; 683ba82664cSAlexander Shishkin msc->base = page_address(page); 6844e0eaf23SAlexander Shishkin msc->base_addr = sg_dma_address(msc->single_sgt.sgl); 685ba82664cSAlexander Shishkin 686ba82664cSAlexander Shishkin return 0; 6874e0eaf23SAlexander Shishkin 6884e0eaf23SAlexander Shishkin err_free_pages: 6894e0eaf23SAlexander Shishkin __free_pages(page, order); 6904e0eaf23SAlexander Shishkin 6914e0eaf23SAlexander Shishkin err_free_sgt: 6924e0eaf23SAlexander Shishkin sg_free_table(&msc->single_sgt); 6934e0eaf23SAlexander Shishkin 6944e0eaf23SAlexander Shishkin err_out: 6954e0eaf23SAlexander Shishkin return ret; 696ba82664cSAlexander Shishkin } 697ba82664cSAlexander Shishkin 698ba82664cSAlexander Shishkin /** 699ba82664cSAlexander Shishkin * msc_buffer_contig_free() - free a contiguous buffer 700ba82664cSAlexander Shishkin * @msc: MSC configured in SINGLE mode 701ba82664cSAlexander Shishkin */ 702ba82664cSAlexander Shishkin static void msc_buffer_contig_free(struct msc *msc) 703ba82664cSAlexander Shishkin { 704ba82664cSAlexander Shishkin unsigned long off; 705ba82664cSAlexander Shishkin 7064e0eaf23SAlexander Shishkin dma_unmap_sg(msc_dev(msc)->parent->parent, msc->single_sgt.sgl, 7074e0eaf23SAlexander Shishkin 1, DMA_FROM_DEVICE); 7084e0eaf23SAlexander Shishkin sg_free_table(&msc->single_sgt); 7094e0eaf23SAlexander Shishkin 710ba82664cSAlexander Shishkin for (off = 0; off < msc->nr_pages << PAGE_SHIFT; off += PAGE_SIZE) { 711ba82664cSAlexander Shishkin struct page *page = virt_to_page(msc->base + off); 712ba82664cSAlexander Shishkin 713ba82664cSAlexander Shishkin page->mapping = NULL; 714ba82664cSAlexander Shishkin __free_page(page); 715ba82664cSAlexander Shishkin } 716ba82664cSAlexander Shishkin 717ba82664cSAlexander Shishkin msc->nr_pages = 0; 718ba82664cSAlexander Shishkin } 719ba82664cSAlexander Shishkin 720ba82664cSAlexander Shishkin /** 721ba82664cSAlexander Shishkin * msc_buffer_contig_get_page() - find a page at a given offset 722ba82664cSAlexander Shishkin * @msc: MSC configured in SINGLE mode 723ba82664cSAlexander Shishkin * @pgoff: page offset 724ba82664cSAlexander Shishkin * 725ba82664cSAlexander Shishkin * Return: page, if @pgoff is within the range, NULL otherwise. 726ba82664cSAlexander Shishkin */ 727ba82664cSAlexander Shishkin static struct page *msc_buffer_contig_get_page(struct msc *msc, 728ba82664cSAlexander Shishkin unsigned long pgoff) 729ba82664cSAlexander Shishkin { 730ba82664cSAlexander Shishkin if (pgoff >= msc->nr_pages) 731ba82664cSAlexander Shishkin return NULL; 732ba82664cSAlexander Shishkin 733ba82664cSAlexander Shishkin return virt_to_page(msc->base + (pgoff << PAGE_SHIFT)); 734ba82664cSAlexander Shishkin } 735ba82664cSAlexander Shishkin 736ba39bd83SAlexander Shishkin static int __msc_buffer_win_alloc(struct msc_window *win, 737ba39bd83SAlexander Shishkin unsigned int nr_blocks) 738ba39bd83SAlexander Shishkin { 739ba39bd83SAlexander Shishkin struct scatterlist *sg_ptr; 740ba39bd83SAlexander Shishkin void *block; 741ba39bd83SAlexander Shishkin int i, ret; 742ba39bd83SAlexander Shishkin 743ba39bd83SAlexander Shishkin ret = sg_alloc_table(&win->sgt, nr_blocks, GFP_KERNEL); 744ba39bd83SAlexander Shishkin if (ret) 745ba39bd83SAlexander Shishkin return -ENOMEM; 746ba39bd83SAlexander Shishkin 747ba39bd83SAlexander Shishkin for_each_sg(win->sgt.sgl, sg_ptr, nr_blocks, i) { 748ba39bd83SAlexander Shishkin block = dma_alloc_coherent(msc_dev(win->msc)->parent->parent, 749ba39bd83SAlexander Shishkin PAGE_SIZE, &sg_dma_address(sg_ptr), 750ba39bd83SAlexander Shishkin GFP_KERNEL); 751ba39bd83SAlexander Shishkin if (!block) 752ba39bd83SAlexander Shishkin goto err_nomem; 753ba39bd83SAlexander Shishkin 754ba39bd83SAlexander Shishkin sg_set_buf(sg_ptr, block, PAGE_SIZE); 755ba39bd83SAlexander Shishkin } 756ba39bd83SAlexander Shishkin 757ba39bd83SAlexander Shishkin return nr_blocks; 758ba39bd83SAlexander Shishkin 759ba39bd83SAlexander Shishkin err_nomem: 760ba39bd83SAlexander Shishkin for (i--; i >= 0; i--) 761ba39bd83SAlexander Shishkin dma_free_coherent(msc_dev(win->msc)->parent->parent, PAGE_SIZE, 762ba39bd83SAlexander Shishkin msc_win_block(win, i), 763ba39bd83SAlexander Shishkin msc_win_baddr(win, i)); 764ba39bd83SAlexander Shishkin 765ba39bd83SAlexander Shishkin sg_free_table(&win->sgt); 766ba39bd83SAlexander Shishkin 767ba39bd83SAlexander Shishkin return -ENOMEM; 768ba39bd83SAlexander Shishkin } 769ba39bd83SAlexander Shishkin 770b96fb368SShaokun Zhang #ifdef CONFIG_X86 771b96fb368SShaokun Zhang static void msc_buffer_set_uc(struct msc_window *win, unsigned int nr_blocks) 772b96fb368SShaokun Zhang { 773b96fb368SShaokun Zhang int i; 774b96fb368SShaokun Zhang 775b96fb368SShaokun Zhang for (i = 0; i < nr_blocks; i++) 776b96fb368SShaokun Zhang /* Set the page as uncached */ 777b96fb368SShaokun Zhang set_memory_uc((unsigned long)msc_win_block(win, i), 1); 778b96fb368SShaokun Zhang } 779b96fb368SShaokun Zhang 780b96fb368SShaokun Zhang static void msc_buffer_set_wb(struct msc_window *win) 781b96fb368SShaokun Zhang { 782b96fb368SShaokun Zhang int i; 783b96fb368SShaokun Zhang 784b96fb368SShaokun Zhang for (i = 0; i < win->nr_blocks; i++) 785b96fb368SShaokun Zhang /* Reset the page to write-back */ 786b96fb368SShaokun Zhang set_memory_wb((unsigned long)msc_win_block(win, i), 1); 787b96fb368SShaokun Zhang } 788b96fb368SShaokun Zhang #else /* !X86 */ 789b96fb368SShaokun Zhang static inline void 790b96fb368SShaokun Zhang msc_buffer_set_uc(struct msc_window *win, unsigned int nr_blocks) {} 791b96fb368SShaokun Zhang static inline void msc_buffer_set_wb(struct msc_window *win) {} 792b96fb368SShaokun Zhang #endif /* CONFIG_X86 */ 793b96fb368SShaokun Zhang 794ba82664cSAlexander Shishkin /** 795ba82664cSAlexander Shishkin * msc_buffer_win_alloc() - alloc a window for a multiblock mode 796ba82664cSAlexander Shishkin * @msc: MSC device 797ba82664cSAlexander Shishkin * @nr_blocks: number of pages in this window 798ba82664cSAlexander Shishkin * 799ba82664cSAlexander Shishkin * This modifies msc::win_list and msc::base, which requires msc::buf_mutex 800ba82664cSAlexander Shishkin * to serialize, so the caller is expected to hold it. 801ba82664cSAlexander Shishkin * 802ba82664cSAlexander Shishkin * Return: 0 on success, -errno otherwise. 803ba82664cSAlexander Shishkin */ 804ba82664cSAlexander Shishkin static int msc_buffer_win_alloc(struct msc *msc, unsigned int nr_blocks) 805ba82664cSAlexander Shishkin { 806ba82664cSAlexander Shishkin struct msc_window *win; 807b96fb368SShaokun Zhang int ret = -ENOMEM; 808ba82664cSAlexander Shishkin 809ba82664cSAlexander Shishkin if (!nr_blocks) 810ba82664cSAlexander Shishkin return 0; 811ba82664cSAlexander Shishkin 812ba39bd83SAlexander Shishkin /* 813ba39bd83SAlexander Shishkin * This limitation hold as long as we need random access to the 814ba39bd83SAlexander Shishkin * block. When that changes, this can go away. 815ba39bd83SAlexander Shishkin */ 816ba39bd83SAlexander Shishkin if (nr_blocks > SG_MAX_SINGLE_ALLOC) 817ba39bd83SAlexander Shishkin return -EINVAL; 818ba39bd83SAlexander Shishkin 819ba39bd83SAlexander Shishkin win = kzalloc(sizeof(*win), GFP_KERNEL); 820ba82664cSAlexander Shishkin if (!win) 821ba82664cSAlexander Shishkin return -ENOMEM; 822ba82664cSAlexander Shishkin 823ba39bd83SAlexander Shishkin win->msc = msc; 824ba39bd83SAlexander Shishkin 825ba82664cSAlexander Shishkin if (!list_empty(&msc->win_list)) { 8260de9e035SAlexander Shishkin struct msc_window *prev = list_last_entry(&msc->win_list, 8270de9e035SAlexander Shishkin struct msc_window, 8280de9e035SAlexander Shishkin entry); 829ba82664cSAlexander Shishkin 830ba39bd83SAlexander Shishkin /* This works as long as blocks are page-sized */ 831ba82664cSAlexander Shishkin win->pgoff = prev->pgoff + prev->nr_blocks; 832ba82664cSAlexander Shishkin } 833ba82664cSAlexander Shishkin 834ba39bd83SAlexander Shishkin ret = __msc_buffer_win_alloc(win, nr_blocks); 835ba39bd83SAlexander Shishkin if (ret < 0) 836d5c435dfSAlexander Shishkin goto err_nomem; 837ba82664cSAlexander Shishkin 838b96fb368SShaokun Zhang msc_buffer_set_uc(win, ret); 839ba82664cSAlexander Shishkin 840ba39bd83SAlexander Shishkin win->nr_blocks = ret; 841ba82664cSAlexander Shishkin 842ba82664cSAlexander Shishkin if (list_empty(&msc->win_list)) { 843ba39bd83SAlexander Shishkin msc->base = msc_win_block(win, 0); 844ba39bd83SAlexander Shishkin msc->base_addr = msc_win_baddr(win, 0); 845aad14ad3SAlexander Shishkin msc->cur_win = win; 846ba82664cSAlexander Shishkin } 847ba82664cSAlexander Shishkin 848ba82664cSAlexander Shishkin list_add_tail(&win->entry, &msc->win_list); 849ba82664cSAlexander Shishkin msc->nr_pages += nr_blocks; 850ba82664cSAlexander Shishkin 851ba82664cSAlexander Shishkin return 0; 852ba82664cSAlexander Shishkin 853ba82664cSAlexander Shishkin err_nomem: 854ba82664cSAlexander Shishkin kfree(win); 855ba82664cSAlexander Shishkin 856ba82664cSAlexander Shishkin return ret; 857ba82664cSAlexander Shishkin } 858ba82664cSAlexander Shishkin 859ba39bd83SAlexander Shishkin static void __msc_buffer_win_free(struct msc *msc, struct msc_window *win) 860ba39bd83SAlexander Shishkin { 861ba39bd83SAlexander Shishkin int i; 862ba39bd83SAlexander Shishkin 863ba39bd83SAlexander Shishkin for (i = 0; i < win->nr_blocks; i++) { 864ba39bd83SAlexander Shishkin struct page *page = sg_page(&win->sgt.sgl[i]); 865ba39bd83SAlexander Shishkin 866ba39bd83SAlexander Shishkin page->mapping = NULL; 867ba39bd83SAlexander Shishkin dma_free_coherent(msc_dev(win->msc)->parent->parent, PAGE_SIZE, 868ba39bd83SAlexander Shishkin msc_win_block(win, i), msc_win_baddr(win, i)); 869ba39bd83SAlexander Shishkin } 870ba39bd83SAlexander Shishkin sg_free_table(&win->sgt); 871ba39bd83SAlexander Shishkin } 872ba39bd83SAlexander Shishkin 873ba82664cSAlexander Shishkin /** 874ba82664cSAlexander Shishkin * msc_buffer_win_free() - free a window from MSC's window list 875ba82664cSAlexander Shishkin * @msc: MSC device 876ba82664cSAlexander Shishkin * @win: window to free 877ba82664cSAlexander Shishkin * 878ba82664cSAlexander Shishkin * This modifies msc::win_list and msc::base, which requires msc::buf_mutex 879ba82664cSAlexander Shishkin * to serialize, so the caller is expected to hold it. 880ba82664cSAlexander Shishkin */ 881ba82664cSAlexander Shishkin static void msc_buffer_win_free(struct msc *msc, struct msc_window *win) 882ba82664cSAlexander Shishkin { 883ba82664cSAlexander Shishkin msc->nr_pages -= win->nr_blocks; 884ba82664cSAlexander Shishkin 885ba82664cSAlexander Shishkin list_del(&win->entry); 886ba82664cSAlexander Shishkin if (list_empty(&msc->win_list)) { 887ba82664cSAlexander Shishkin msc->base = NULL; 888ba82664cSAlexander Shishkin msc->base_addr = 0; 889ba82664cSAlexander Shishkin } 890ba82664cSAlexander Shishkin 891b96fb368SShaokun Zhang msc_buffer_set_wb(win); 892ba39bd83SAlexander Shishkin 893ba39bd83SAlexander Shishkin __msc_buffer_win_free(msc, win); 894ba82664cSAlexander Shishkin 895ba82664cSAlexander Shishkin kfree(win); 896ba82664cSAlexander Shishkin } 897ba82664cSAlexander Shishkin 898ba82664cSAlexander Shishkin /** 899ba82664cSAlexander Shishkin * msc_buffer_relink() - set up block descriptors for multiblock mode 900ba82664cSAlexander Shishkin * @msc: MSC device 901ba82664cSAlexander Shishkin * 902ba82664cSAlexander Shishkin * This traverses msc::win_list, which requires msc::buf_mutex to serialize, 903ba82664cSAlexander Shishkin * so the caller is expected to hold it. 904ba82664cSAlexander Shishkin */ 905ba82664cSAlexander Shishkin static void msc_buffer_relink(struct msc *msc) 906ba82664cSAlexander Shishkin { 907ba82664cSAlexander Shishkin struct msc_window *win, *next_win; 908ba82664cSAlexander Shishkin 909ba82664cSAlexander Shishkin /* call with msc::mutex locked */ 910ba82664cSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) { 911ba82664cSAlexander Shishkin unsigned int blk; 912ba82664cSAlexander Shishkin u32 sw_tag = 0; 913ba82664cSAlexander Shishkin 914ba82664cSAlexander Shishkin /* 915ba82664cSAlexander Shishkin * Last window's next_win should point to the first window 916ba82664cSAlexander Shishkin * and MSC_SW_TAG_LASTWIN should be set. 917ba82664cSAlexander Shishkin */ 918ba82664cSAlexander Shishkin if (msc_is_last_win(win)) { 919ba82664cSAlexander Shishkin sw_tag |= MSC_SW_TAG_LASTWIN; 9200de9e035SAlexander Shishkin next_win = list_first_entry(&msc->win_list, 921ba82664cSAlexander Shishkin struct msc_window, entry); 922ba82664cSAlexander Shishkin } else { 9230de9e035SAlexander Shishkin next_win = list_next_entry(win, entry); 924ba82664cSAlexander Shishkin } 925ba82664cSAlexander Shishkin 926ba82664cSAlexander Shishkin for (blk = 0; blk < win->nr_blocks; blk++) { 927ba39bd83SAlexander Shishkin struct msc_block_desc *bdesc = msc_win_block(win, blk); 928ba82664cSAlexander Shishkin 929ba82664cSAlexander Shishkin memset(bdesc, 0, sizeof(*bdesc)); 930ba82664cSAlexander Shishkin 931ba39bd83SAlexander Shishkin bdesc->next_win = msc_win_bpfn(next_win, 0); 932ba82664cSAlexander Shishkin 933ba82664cSAlexander Shishkin /* 934ba82664cSAlexander Shishkin * Similarly to last window, last block should point 935ba82664cSAlexander Shishkin * to the first one. 936ba82664cSAlexander Shishkin */ 937ba82664cSAlexander Shishkin if (blk == win->nr_blocks - 1) { 938ba82664cSAlexander Shishkin sw_tag |= MSC_SW_TAG_LASTBLK; 939ba39bd83SAlexander Shishkin bdesc->next_blk = msc_win_bpfn(win, 0); 940ba82664cSAlexander Shishkin } else { 941ba39bd83SAlexander Shishkin bdesc->next_blk = msc_win_bpfn(win, blk + 1); 942ba82664cSAlexander Shishkin } 943ba82664cSAlexander Shishkin 944ba82664cSAlexander Shishkin bdesc->sw_tag = sw_tag; 945ba82664cSAlexander Shishkin bdesc->block_sz = PAGE_SIZE / 64; 946ba82664cSAlexander Shishkin } 947ba82664cSAlexander Shishkin } 948ba82664cSAlexander Shishkin 949ba82664cSAlexander Shishkin /* 950ba82664cSAlexander Shishkin * Make the above writes globally visible before tracing is 951ba82664cSAlexander Shishkin * enabled to make sure hardware sees them coherently. 952ba82664cSAlexander Shishkin */ 953ba82664cSAlexander Shishkin wmb(); 954ba82664cSAlexander Shishkin } 955ba82664cSAlexander Shishkin 956ba82664cSAlexander Shishkin static void msc_buffer_multi_free(struct msc *msc) 957ba82664cSAlexander Shishkin { 958ba82664cSAlexander Shishkin struct msc_window *win, *iter; 959ba82664cSAlexander Shishkin 960ba82664cSAlexander Shishkin list_for_each_entry_safe(win, iter, &msc->win_list, entry) 961ba82664cSAlexander Shishkin msc_buffer_win_free(msc, win); 962ba82664cSAlexander Shishkin } 963ba82664cSAlexander Shishkin 964ba82664cSAlexander Shishkin static int msc_buffer_multi_alloc(struct msc *msc, unsigned long *nr_pages, 965ba82664cSAlexander Shishkin unsigned int nr_wins) 966ba82664cSAlexander Shishkin { 967ba82664cSAlexander Shishkin int ret, i; 968ba82664cSAlexander Shishkin 969ba82664cSAlexander Shishkin for (i = 0; i < nr_wins; i++) { 970ba82664cSAlexander Shishkin ret = msc_buffer_win_alloc(msc, nr_pages[i]); 971ba82664cSAlexander Shishkin if (ret) { 972ba82664cSAlexander Shishkin msc_buffer_multi_free(msc); 973ba82664cSAlexander Shishkin return ret; 974ba82664cSAlexander Shishkin } 975ba82664cSAlexander Shishkin } 976ba82664cSAlexander Shishkin 977ba82664cSAlexander Shishkin msc_buffer_relink(msc); 978ba82664cSAlexander Shishkin 979ba82664cSAlexander Shishkin return 0; 980ba82664cSAlexander Shishkin } 981ba82664cSAlexander Shishkin 982ba82664cSAlexander Shishkin /** 983ba82664cSAlexander Shishkin * msc_buffer_free() - free buffers for MSC 984ba82664cSAlexander Shishkin * @msc: MSC device 985ba82664cSAlexander Shishkin * 986ba82664cSAlexander Shishkin * Free MSC's storage buffers. 987ba82664cSAlexander Shishkin * 988ba82664cSAlexander Shishkin * This modifies msc::win_list and msc::base, which requires msc::buf_mutex to 989ba82664cSAlexander Shishkin * serialize, so the caller is expected to hold it. 990ba82664cSAlexander Shishkin */ 991ba82664cSAlexander Shishkin static void msc_buffer_free(struct msc *msc) 992ba82664cSAlexander Shishkin { 993ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) 994ba82664cSAlexander Shishkin msc_buffer_contig_free(msc); 995ba82664cSAlexander Shishkin else if (msc->mode == MSC_MODE_MULTI) 996ba82664cSAlexander Shishkin msc_buffer_multi_free(msc); 997ba82664cSAlexander Shishkin } 998ba82664cSAlexander Shishkin 999ba82664cSAlexander Shishkin /** 1000ba82664cSAlexander Shishkin * msc_buffer_alloc() - allocate a buffer for MSC 1001ba82664cSAlexander Shishkin * @msc: MSC device 1002ba82664cSAlexander Shishkin * @size: allocation size in bytes 1003ba82664cSAlexander Shishkin * 1004ba82664cSAlexander Shishkin * Allocate a storage buffer for MSC, depending on the msc::mode, it will be 1005ba82664cSAlexander Shishkin * either done via msc_buffer_contig_alloc() for SINGLE operation mode or 1006ba82664cSAlexander Shishkin * msc_buffer_win_alloc() for multiblock operation. The latter allocates one 1007ba82664cSAlexander Shishkin * window per invocation, so in multiblock mode this can be called multiple 1008ba82664cSAlexander Shishkin * times for the same MSC to allocate multiple windows. 1009ba82664cSAlexander Shishkin * 1010ba82664cSAlexander Shishkin * This modifies msc::win_list and msc::base, which requires msc::buf_mutex 1011ba82664cSAlexander Shishkin * to serialize, so the caller is expected to hold it. 1012ba82664cSAlexander Shishkin * 1013ba82664cSAlexander Shishkin * Return: 0 on success, -errno otherwise. 1014ba82664cSAlexander Shishkin */ 1015ba82664cSAlexander Shishkin static int msc_buffer_alloc(struct msc *msc, unsigned long *nr_pages, 1016ba82664cSAlexander Shishkin unsigned int nr_wins) 1017ba82664cSAlexander Shishkin { 1018ba82664cSAlexander Shishkin int ret; 1019ba82664cSAlexander Shishkin 1020ba82664cSAlexander Shishkin /* -1: buffer not allocated */ 1021ba82664cSAlexander Shishkin if (atomic_read(&msc->user_count) != -1) 1022ba82664cSAlexander Shishkin return -EBUSY; 1023ba82664cSAlexander Shishkin 1024ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) { 1025ba82664cSAlexander Shishkin if (nr_wins != 1) 1026ba82664cSAlexander Shishkin return -EINVAL; 1027ba82664cSAlexander Shishkin 1028ba82664cSAlexander Shishkin ret = msc_buffer_contig_alloc(msc, nr_pages[0] << PAGE_SHIFT); 1029ba82664cSAlexander Shishkin } else if (msc->mode == MSC_MODE_MULTI) { 1030ba82664cSAlexander Shishkin ret = msc_buffer_multi_alloc(msc, nr_pages, nr_wins); 1031ba82664cSAlexander Shishkin } else { 1032ba82664cSAlexander Shishkin ret = -ENOTSUPP; 1033ba82664cSAlexander Shishkin } 1034ba82664cSAlexander Shishkin 1035ba82664cSAlexander Shishkin if (!ret) { 1036ba82664cSAlexander Shishkin /* allocation should be visible before the counter goes to 0 */ 1037ba82664cSAlexander Shishkin smp_mb__before_atomic(); 1038ba82664cSAlexander Shishkin 1039ba82664cSAlexander Shishkin if (WARN_ON_ONCE(atomic_cmpxchg(&msc->user_count, -1, 0) != -1)) 1040ba82664cSAlexander Shishkin return -EINVAL; 1041ba82664cSAlexander Shishkin } 1042ba82664cSAlexander Shishkin 1043ba82664cSAlexander Shishkin return ret; 1044ba82664cSAlexander Shishkin } 1045ba82664cSAlexander Shishkin 1046ba82664cSAlexander Shishkin /** 1047ba82664cSAlexander Shishkin * msc_buffer_unlocked_free_unless_used() - free a buffer unless it's in use 1048ba82664cSAlexander Shishkin * @msc: MSC device 1049ba82664cSAlexander Shishkin * 1050ba82664cSAlexander Shishkin * This will free MSC buffer unless it is in use or there is no allocated 1051ba82664cSAlexander Shishkin * buffer. 1052ba82664cSAlexander Shishkin * Caller needs to hold msc::buf_mutex. 1053ba82664cSAlexander Shishkin * 1054ba82664cSAlexander Shishkin * Return: 0 on successful deallocation or if there was no buffer to 1055ba82664cSAlexander Shishkin * deallocate, -EBUSY if there are active users. 1056ba82664cSAlexander Shishkin */ 1057ba82664cSAlexander Shishkin static int msc_buffer_unlocked_free_unless_used(struct msc *msc) 1058ba82664cSAlexander Shishkin { 1059ba82664cSAlexander Shishkin int count, ret = 0; 1060ba82664cSAlexander Shishkin 1061ba82664cSAlexander Shishkin count = atomic_cmpxchg(&msc->user_count, 0, -1); 1062ba82664cSAlexander Shishkin 1063ba82664cSAlexander Shishkin /* > 0: buffer is allocated and has users */ 1064ba82664cSAlexander Shishkin if (count > 0) 1065ba82664cSAlexander Shishkin ret = -EBUSY; 1066ba82664cSAlexander Shishkin /* 0: buffer is allocated, no users */ 1067ba82664cSAlexander Shishkin else if (!count) 1068ba82664cSAlexander Shishkin msc_buffer_free(msc); 1069ba82664cSAlexander Shishkin /* < 0: no buffer, nothing to do */ 1070ba82664cSAlexander Shishkin 1071ba82664cSAlexander Shishkin return ret; 1072ba82664cSAlexander Shishkin } 1073ba82664cSAlexander Shishkin 1074ba82664cSAlexander Shishkin /** 1075ba82664cSAlexander Shishkin * msc_buffer_free_unless_used() - free a buffer unless it's in use 1076ba82664cSAlexander Shishkin * @msc: MSC device 1077ba82664cSAlexander Shishkin * 1078ba82664cSAlexander Shishkin * This is a locked version of msc_buffer_unlocked_free_unless_used(). 1079ba82664cSAlexander Shishkin */ 1080ba82664cSAlexander Shishkin static int msc_buffer_free_unless_used(struct msc *msc) 1081ba82664cSAlexander Shishkin { 1082ba82664cSAlexander Shishkin int ret; 1083ba82664cSAlexander Shishkin 1084ba82664cSAlexander Shishkin mutex_lock(&msc->buf_mutex); 1085ba82664cSAlexander Shishkin ret = msc_buffer_unlocked_free_unless_used(msc); 1086ba82664cSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 1087ba82664cSAlexander Shishkin 1088ba82664cSAlexander Shishkin return ret; 1089ba82664cSAlexander Shishkin } 1090ba82664cSAlexander Shishkin 1091ba82664cSAlexander Shishkin /** 1092ba82664cSAlexander Shishkin * msc_buffer_get_page() - get MSC buffer page at a given offset 1093ba82664cSAlexander Shishkin * @msc: MSC device 1094ba82664cSAlexander Shishkin * @pgoff: page offset into the storage buffer 1095ba82664cSAlexander Shishkin * 1096ba82664cSAlexander Shishkin * This traverses msc::win_list, so holding msc::buf_mutex is expected from 1097ba82664cSAlexander Shishkin * the caller. 1098ba82664cSAlexander Shishkin * 1099ba82664cSAlexander Shishkin * Return: page if @pgoff corresponds to a valid buffer page or NULL. 1100ba82664cSAlexander Shishkin */ 1101ba82664cSAlexander Shishkin static struct page *msc_buffer_get_page(struct msc *msc, unsigned long pgoff) 1102ba82664cSAlexander Shishkin { 1103ba82664cSAlexander Shishkin struct msc_window *win; 1104ba82664cSAlexander Shishkin 1105ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) 1106ba82664cSAlexander Shishkin return msc_buffer_contig_get_page(msc, pgoff); 1107ba82664cSAlexander Shishkin 1108ba82664cSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) 1109ba82664cSAlexander Shishkin if (pgoff >= win->pgoff && pgoff < win->pgoff + win->nr_blocks) 1110ba82664cSAlexander Shishkin goto found; 1111ba82664cSAlexander Shishkin 1112ba82664cSAlexander Shishkin return NULL; 1113ba82664cSAlexander Shishkin 1114ba82664cSAlexander Shishkin found: 1115ba82664cSAlexander Shishkin pgoff -= win->pgoff; 1116ba39bd83SAlexander Shishkin return sg_page(&win->sgt.sgl[pgoff]); 1117ba82664cSAlexander Shishkin } 1118ba82664cSAlexander Shishkin 1119ba82664cSAlexander Shishkin /** 1120ba82664cSAlexander Shishkin * struct msc_win_to_user_struct - data for copy_to_user() callback 1121ba82664cSAlexander Shishkin * @buf: userspace buffer to copy data to 1122ba82664cSAlexander Shishkin * @offset: running offset 1123ba82664cSAlexander Shishkin */ 1124ba82664cSAlexander Shishkin struct msc_win_to_user_struct { 1125ba82664cSAlexander Shishkin char __user *buf; 1126ba82664cSAlexander Shishkin unsigned long offset; 1127ba82664cSAlexander Shishkin }; 1128ba82664cSAlexander Shishkin 1129ba82664cSAlexander Shishkin /** 1130ba82664cSAlexander Shishkin * msc_win_to_user() - iterator for msc_buffer_iterate() to copy data to user 1131ba82664cSAlexander Shishkin * @data: callback's private data 1132ba82664cSAlexander Shishkin * @src: source buffer 1133ba82664cSAlexander Shishkin * @len: amount of data to copy from the source buffer 1134ba82664cSAlexander Shishkin */ 1135ba82664cSAlexander Shishkin static unsigned long msc_win_to_user(void *data, void *src, size_t len) 1136ba82664cSAlexander Shishkin { 1137ba82664cSAlexander Shishkin struct msc_win_to_user_struct *u = data; 1138ba82664cSAlexander Shishkin unsigned long ret; 1139ba82664cSAlexander Shishkin 1140ba82664cSAlexander Shishkin ret = copy_to_user(u->buf + u->offset, src, len); 1141ba82664cSAlexander Shishkin u->offset += len - ret; 1142ba82664cSAlexander Shishkin 1143ba82664cSAlexander Shishkin return ret; 1144ba82664cSAlexander Shishkin } 1145ba82664cSAlexander Shishkin 1146ba82664cSAlexander Shishkin 1147ba82664cSAlexander Shishkin /* 1148ba82664cSAlexander Shishkin * file operations' callbacks 1149ba82664cSAlexander Shishkin */ 1150ba82664cSAlexander Shishkin 1151ba82664cSAlexander Shishkin static int intel_th_msc_open(struct inode *inode, struct file *file) 1152ba82664cSAlexander Shishkin { 1153ba82664cSAlexander Shishkin struct intel_th_device *thdev = file->private_data; 1154ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 1155ba82664cSAlexander Shishkin struct msc_iter *iter; 1156ba82664cSAlexander Shishkin 1157ba82664cSAlexander Shishkin if (!capable(CAP_SYS_RAWIO)) 1158ba82664cSAlexander Shishkin return -EPERM; 1159ba82664cSAlexander Shishkin 1160ba82664cSAlexander Shishkin iter = msc_iter_install(msc); 1161a45ff6edSAlexander Shishkin if (IS_ERR(iter)) 1162a45ff6edSAlexander Shishkin return PTR_ERR(iter); 1163ba82664cSAlexander Shishkin 1164ba82664cSAlexander Shishkin file->private_data = iter; 1165ba82664cSAlexander Shishkin 1166ba82664cSAlexander Shishkin return nonseekable_open(inode, file); 1167ba82664cSAlexander Shishkin } 1168ba82664cSAlexander Shishkin 1169ba82664cSAlexander Shishkin static int intel_th_msc_release(struct inode *inode, struct file *file) 1170ba82664cSAlexander Shishkin { 1171ba82664cSAlexander Shishkin struct msc_iter *iter = file->private_data; 1172ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1173ba82664cSAlexander Shishkin 1174ba82664cSAlexander Shishkin msc_iter_remove(iter, msc); 1175ba82664cSAlexander Shishkin 1176ba82664cSAlexander Shishkin return 0; 1177ba82664cSAlexander Shishkin } 1178ba82664cSAlexander Shishkin 1179ba82664cSAlexander Shishkin static ssize_t 1180ba82664cSAlexander Shishkin msc_single_to_user(struct msc *msc, char __user *buf, loff_t off, size_t len) 1181ba82664cSAlexander Shishkin { 1182ed392688SAlexander Shishkin unsigned long size = msc->nr_pages << PAGE_SHIFT, rem = len; 1183ba82664cSAlexander Shishkin unsigned long start = off, tocopy = 0; 1184ba82664cSAlexander Shishkin 1185ba82664cSAlexander Shishkin if (msc->single_wrap) { 1186ba82664cSAlexander Shishkin start += msc->single_sz; 1187ba82664cSAlexander Shishkin if (start < size) { 1188ba82664cSAlexander Shishkin tocopy = min(rem, size - start); 1189ba82664cSAlexander Shishkin if (copy_to_user(buf, msc->base + start, tocopy)) 1190ba82664cSAlexander Shishkin return -EFAULT; 1191ba82664cSAlexander Shishkin 1192ba82664cSAlexander Shishkin buf += tocopy; 1193ba82664cSAlexander Shishkin rem -= tocopy; 1194ba82664cSAlexander Shishkin start += tocopy; 1195ba82664cSAlexander Shishkin } 1196ba82664cSAlexander Shishkin 1197ba82664cSAlexander Shishkin start &= size - 1; 1198ba82664cSAlexander Shishkin if (rem) { 1199ba82664cSAlexander Shishkin tocopy = min(rem, msc->single_sz - start); 1200ba82664cSAlexander Shishkin if (copy_to_user(buf, msc->base + start, tocopy)) 1201ba82664cSAlexander Shishkin return -EFAULT; 1202ba82664cSAlexander Shishkin 1203ba82664cSAlexander Shishkin rem -= tocopy; 1204ba82664cSAlexander Shishkin } 1205ba82664cSAlexander Shishkin 1206ba82664cSAlexander Shishkin return len - rem; 1207ba82664cSAlexander Shishkin } 1208ba82664cSAlexander Shishkin 1209ba82664cSAlexander Shishkin if (copy_to_user(buf, msc->base + start, rem)) 1210ba82664cSAlexander Shishkin return -EFAULT; 1211ba82664cSAlexander Shishkin 1212ba82664cSAlexander Shishkin return len; 1213ba82664cSAlexander Shishkin } 1214ba82664cSAlexander Shishkin 1215ba82664cSAlexander Shishkin static ssize_t intel_th_msc_read(struct file *file, char __user *buf, 1216ba82664cSAlexander Shishkin size_t len, loff_t *ppos) 1217ba82664cSAlexander Shishkin { 1218ba82664cSAlexander Shishkin struct msc_iter *iter = file->private_data; 1219ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1220ba82664cSAlexander Shishkin size_t size; 1221ba82664cSAlexander Shishkin loff_t off = *ppos; 1222ba82664cSAlexander Shishkin ssize_t ret = 0; 1223ba82664cSAlexander Shishkin 1224ba82664cSAlexander Shishkin if (!atomic_inc_unless_negative(&msc->user_count)) 1225ba82664cSAlexander Shishkin return 0; 1226ba82664cSAlexander Shishkin 1227ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE && !msc->single_wrap) 1228ba82664cSAlexander Shishkin size = msc->single_sz; 1229ba82664cSAlexander Shishkin else 1230ba82664cSAlexander Shishkin size = msc->nr_pages << PAGE_SHIFT; 1231ba82664cSAlexander Shishkin 1232ba82664cSAlexander Shishkin if (!size) 1233ba82664cSAlexander Shishkin goto put_count; 12342bed074aSLaurent FERT 12352bed074aSLaurent FERT if (off >= size) 12362bed074aSLaurent FERT goto put_count; 12372bed074aSLaurent FERT 1238ba82664cSAlexander Shishkin if (off + len >= size) 1239ba82664cSAlexander Shishkin len = size - off; 1240ba82664cSAlexander Shishkin 1241ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) { 1242ba82664cSAlexander Shishkin ret = msc_single_to_user(msc, buf, off, len); 1243ba82664cSAlexander Shishkin if (ret >= 0) 1244ba82664cSAlexander Shishkin *ppos += ret; 1245ba82664cSAlexander Shishkin } else if (msc->mode == MSC_MODE_MULTI) { 1246ba82664cSAlexander Shishkin struct msc_win_to_user_struct u = { 1247ba82664cSAlexander Shishkin .buf = buf, 1248ba82664cSAlexander Shishkin .offset = 0, 1249ba82664cSAlexander Shishkin }; 1250ba82664cSAlexander Shishkin 1251ba82664cSAlexander Shishkin ret = msc_buffer_iterate(iter, len, &u, msc_win_to_user); 1252ba82664cSAlexander Shishkin if (ret >= 0) 1253ba82664cSAlexander Shishkin *ppos = iter->offset; 1254ba82664cSAlexander Shishkin } else { 1255ba82664cSAlexander Shishkin ret = -ENOTSUPP; 1256ba82664cSAlexander Shishkin } 1257ba82664cSAlexander Shishkin 1258ba82664cSAlexander Shishkin put_count: 1259ba82664cSAlexander Shishkin atomic_dec(&msc->user_count); 1260ba82664cSAlexander Shishkin 1261ba82664cSAlexander Shishkin return ret; 1262ba82664cSAlexander Shishkin } 1263ba82664cSAlexander Shishkin 1264ba82664cSAlexander Shishkin /* 1265ba82664cSAlexander Shishkin * vm operations callbacks (vm_ops) 1266ba82664cSAlexander Shishkin */ 1267ba82664cSAlexander Shishkin 1268ba82664cSAlexander Shishkin static void msc_mmap_open(struct vm_area_struct *vma) 1269ba82664cSAlexander Shishkin { 1270ba82664cSAlexander Shishkin struct msc_iter *iter = vma->vm_file->private_data; 1271ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1272ba82664cSAlexander Shishkin 1273ba82664cSAlexander Shishkin atomic_inc(&msc->mmap_count); 1274ba82664cSAlexander Shishkin } 1275ba82664cSAlexander Shishkin 1276ba82664cSAlexander Shishkin static void msc_mmap_close(struct vm_area_struct *vma) 1277ba82664cSAlexander Shishkin { 1278ba82664cSAlexander Shishkin struct msc_iter *iter = vma->vm_file->private_data; 1279ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1280ba82664cSAlexander Shishkin unsigned long pg; 1281ba82664cSAlexander Shishkin 1282ba82664cSAlexander Shishkin if (!atomic_dec_and_mutex_lock(&msc->mmap_count, &msc->buf_mutex)) 1283ba82664cSAlexander Shishkin return; 1284ba82664cSAlexander Shishkin 12850139aa7bSJoonsoo Kim /* drop page _refcounts */ 1286ba82664cSAlexander Shishkin for (pg = 0; pg < msc->nr_pages; pg++) { 1287ba82664cSAlexander Shishkin struct page *page = msc_buffer_get_page(msc, pg); 1288ba82664cSAlexander Shishkin 1289ba82664cSAlexander Shishkin if (WARN_ON_ONCE(!page)) 1290ba82664cSAlexander Shishkin continue; 1291ba82664cSAlexander Shishkin 1292ba82664cSAlexander Shishkin if (page->mapping) 1293ba82664cSAlexander Shishkin page->mapping = NULL; 1294ba82664cSAlexander Shishkin } 1295ba82664cSAlexander Shishkin 1296ba82664cSAlexander Shishkin /* last mapping -- drop user_count */ 1297ba82664cSAlexander Shishkin atomic_dec(&msc->user_count); 1298ba82664cSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 1299ba82664cSAlexander Shishkin } 1300ba82664cSAlexander Shishkin 130142df0509SSouptick Joarder static vm_fault_t msc_mmap_fault(struct vm_fault *vmf) 1302ba82664cSAlexander Shishkin { 130311bac800SDave Jiang struct msc_iter *iter = vmf->vma->vm_file->private_data; 1304ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1305ba82664cSAlexander Shishkin 1306ba82664cSAlexander Shishkin vmf->page = msc_buffer_get_page(msc, vmf->pgoff); 1307ba82664cSAlexander Shishkin if (!vmf->page) 1308ba82664cSAlexander Shishkin return VM_FAULT_SIGBUS; 1309ba82664cSAlexander Shishkin 1310ba82664cSAlexander Shishkin get_page(vmf->page); 131111bac800SDave Jiang vmf->page->mapping = vmf->vma->vm_file->f_mapping; 1312ba82664cSAlexander Shishkin vmf->page->index = vmf->pgoff; 1313ba82664cSAlexander Shishkin 1314ba82664cSAlexander Shishkin return 0; 1315ba82664cSAlexander Shishkin } 1316ba82664cSAlexander Shishkin 1317ba82664cSAlexander Shishkin static const struct vm_operations_struct msc_mmap_ops = { 1318ba82664cSAlexander Shishkin .open = msc_mmap_open, 1319ba82664cSAlexander Shishkin .close = msc_mmap_close, 1320ba82664cSAlexander Shishkin .fault = msc_mmap_fault, 1321ba82664cSAlexander Shishkin }; 1322ba82664cSAlexander Shishkin 1323ba82664cSAlexander Shishkin static int intel_th_msc_mmap(struct file *file, struct vm_area_struct *vma) 1324ba82664cSAlexander Shishkin { 1325ba82664cSAlexander Shishkin unsigned long size = vma->vm_end - vma->vm_start; 1326ba82664cSAlexander Shishkin struct msc_iter *iter = vma->vm_file->private_data; 1327ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1328ba82664cSAlexander Shishkin int ret = -EINVAL; 1329ba82664cSAlexander Shishkin 1330ba82664cSAlexander Shishkin if (!size || offset_in_page(size)) 1331ba82664cSAlexander Shishkin return -EINVAL; 1332ba82664cSAlexander Shishkin 1333ba82664cSAlexander Shishkin if (vma->vm_pgoff) 1334ba82664cSAlexander Shishkin return -EINVAL; 1335ba82664cSAlexander Shishkin 1336ba82664cSAlexander Shishkin /* grab user_count once per mmap; drop in msc_mmap_close() */ 1337ba82664cSAlexander Shishkin if (!atomic_inc_unless_negative(&msc->user_count)) 1338ba82664cSAlexander Shishkin return -EINVAL; 1339ba82664cSAlexander Shishkin 1340ba82664cSAlexander Shishkin if (msc->mode != MSC_MODE_SINGLE && 1341ba82664cSAlexander Shishkin msc->mode != MSC_MODE_MULTI) 1342ba82664cSAlexander Shishkin goto out; 1343ba82664cSAlexander Shishkin 1344ba82664cSAlexander Shishkin if (size >> PAGE_SHIFT != msc->nr_pages) 1345ba82664cSAlexander Shishkin goto out; 1346ba82664cSAlexander Shishkin 1347ba82664cSAlexander Shishkin atomic_set(&msc->mmap_count, 1); 1348ba82664cSAlexander Shishkin ret = 0; 1349ba82664cSAlexander Shishkin 1350ba82664cSAlexander Shishkin out: 1351ba82664cSAlexander Shishkin if (ret) 1352ba82664cSAlexander Shishkin atomic_dec(&msc->user_count); 1353ba82664cSAlexander Shishkin 1354ba82664cSAlexander Shishkin vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 1355ba82664cSAlexander Shishkin vma->vm_flags |= VM_DONTEXPAND | VM_DONTCOPY; 1356ba82664cSAlexander Shishkin vma->vm_ops = &msc_mmap_ops; 1357ba82664cSAlexander Shishkin return ret; 1358ba82664cSAlexander Shishkin } 1359ba82664cSAlexander Shishkin 1360ba82664cSAlexander Shishkin static const struct file_operations intel_th_msc_fops = { 1361ba82664cSAlexander Shishkin .open = intel_th_msc_open, 1362ba82664cSAlexander Shishkin .release = intel_th_msc_release, 1363ba82664cSAlexander Shishkin .read = intel_th_msc_read, 1364ba82664cSAlexander Shishkin .mmap = intel_th_msc_mmap, 1365ba82664cSAlexander Shishkin .llseek = no_llseek, 13668e9a2bebSAlexander Shishkin .owner = THIS_MODULE, 1367ba82664cSAlexander Shishkin }; 1368ba82664cSAlexander Shishkin 13698d415512SAlexander Shishkin static void intel_th_msc_wait_empty(struct intel_th_device *thdev) 13708d415512SAlexander Shishkin { 13718d415512SAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 13728d415512SAlexander Shishkin unsigned long count; 13738d415512SAlexander Shishkin u32 reg; 13748d415512SAlexander Shishkin 13758d415512SAlexander Shishkin for (reg = 0, count = MSC_PLE_WAITLOOP_DEPTH; 13768d415512SAlexander Shishkin count && !(reg & MSCSTS_PLE); count--) { 13778d415512SAlexander Shishkin reg = __raw_readl(msc->reg_base + REG_MSU_MSC0STS); 13788d415512SAlexander Shishkin cpu_relax(); 13798d415512SAlexander Shishkin } 13808d415512SAlexander Shishkin 13818d415512SAlexander Shishkin if (!count) 13828d415512SAlexander Shishkin dev_dbg(msc_dev(msc), "timeout waiting for MSC0 PLE\n"); 13838d415512SAlexander Shishkin } 13848d415512SAlexander Shishkin 1385ba82664cSAlexander Shishkin static int intel_th_msc_init(struct msc *msc) 1386ba82664cSAlexander Shishkin { 1387ba82664cSAlexander Shishkin atomic_set(&msc->user_count, -1); 1388ba82664cSAlexander Shishkin 1389ba82664cSAlexander Shishkin msc->mode = MSC_MODE_MULTI; 1390ba82664cSAlexander Shishkin mutex_init(&msc->buf_mutex); 1391ba82664cSAlexander Shishkin INIT_LIST_HEAD(&msc->win_list); 1392ba82664cSAlexander Shishkin INIT_LIST_HEAD(&msc->iter_list); 1393ba82664cSAlexander Shishkin 1394ba82664cSAlexander Shishkin msc->burst_len = 1395ba82664cSAlexander Shishkin (ioread32(msc->reg_base + REG_MSU_MSC0CTL) & MSC_LEN) >> 1396ba82664cSAlexander Shishkin __ffs(MSC_LEN); 1397ba82664cSAlexander Shishkin 1398ba82664cSAlexander Shishkin return 0; 1399ba82664cSAlexander Shishkin } 1400ba82664cSAlexander Shishkin 1401aad14ad3SAlexander Shishkin static void msc_win_switch(struct msc *msc) 1402aad14ad3SAlexander Shishkin { 14039800db28SYueHaibing struct msc_window *first; 1404aad14ad3SAlexander Shishkin 1405aad14ad3SAlexander Shishkin first = list_first_entry(&msc->win_list, struct msc_window, entry); 1406aad14ad3SAlexander Shishkin 1407aad14ad3SAlexander Shishkin if (msc_is_last_win(msc->cur_win)) 1408aad14ad3SAlexander Shishkin msc->cur_win = first; 1409aad14ad3SAlexander Shishkin else 1410aad14ad3SAlexander Shishkin msc->cur_win = list_next_entry(msc->cur_win, entry); 1411aad14ad3SAlexander Shishkin 1412aad14ad3SAlexander Shishkin msc->base = msc_win_block(msc->cur_win, 0); 1413aad14ad3SAlexander Shishkin msc->base_addr = msc_win_baddr(msc->cur_win, 0); 1414aad14ad3SAlexander Shishkin 1415aad14ad3SAlexander Shishkin intel_th_trace_switch(msc->thdev); 1416aad14ad3SAlexander Shishkin } 1417aad14ad3SAlexander Shishkin 1418aac8da65SAlexander Shishkin static irqreturn_t intel_th_msc_interrupt(struct intel_th_device *thdev) 1419aac8da65SAlexander Shishkin { 1420aac8da65SAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 1421aac8da65SAlexander Shishkin u32 msusts = ioread32(msc->msu_base + REG_MSU_MSUSTS); 1422aac8da65SAlexander Shishkin u32 mask = msc->index ? MSUSTS_MSC1BLAST : MSUSTS_MSC0BLAST; 1423aac8da65SAlexander Shishkin 1424aac8da65SAlexander Shishkin if (!(msusts & mask)) { 1425aac8da65SAlexander Shishkin if (msc->enabled) 1426aac8da65SAlexander Shishkin return IRQ_HANDLED; 1427aac8da65SAlexander Shishkin return IRQ_NONE; 1428aac8da65SAlexander Shishkin } 1429aac8da65SAlexander Shishkin 1430aac8da65SAlexander Shishkin return IRQ_HANDLED; 1431aac8da65SAlexander Shishkin } 1432aac8da65SAlexander Shishkin 1433ba82664cSAlexander Shishkin static const char * const msc_mode[] = { 1434ba82664cSAlexander Shishkin [MSC_MODE_SINGLE] = "single", 1435ba82664cSAlexander Shishkin [MSC_MODE_MULTI] = "multi", 1436ba82664cSAlexander Shishkin [MSC_MODE_EXI] = "ExI", 1437ba82664cSAlexander Shishkin [MSC_MODE_DEBUG] = "debug", 1438ba82664cSAlexander Shishkin }; 1439ba82664cSAlexander Shishkin 1440ba82664cSAlexander Shishkin static ssize_t 1441ba82664cSAlexander Shishkin wrap_show(struct device *dev, struct device_attribute *attr, char *buf) 1442ba82664cSAlexander Shishkin { 1443ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1444ba82664cSAlexander Shishkin 1445ba82664cSAlexander Shishkin return scnprintf(buf, PAGE_SIZE, "%d\n", msc->wrap); 1446ba82664cSAlexander Shishkin } 1447ba82664cSAlexander Shishkin 1448ba82664cSAlexander Shishkin static ssize_t 1449ba82664cSAlexander Shishkin wrap_store(struct device *dev, struct device_attribute *attr, const char *buf, 1450ba82664cSAlexander Shishkin size_t size) 1451ba82664cSAlexander Shishkin { 1452ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1453ba82664cSAlexander Shishkin unsigned long val; 1454ba82664cSAlexander Shishkin int ret; 1455ba82664cSAlexander Shishkin 1456ba82664cSAlexander Shishkin ret = kstrtoul(buf, 10, &val); 1457ba82664cSAlexander Shishkin if (ret) 1458ba82664cSAlexander Shishkin return ret; 1459ba82664cSAlexander Shishkin 1460ba82664cSAlexander Shishkin msc->wrap = !!val; 1461ba82664cSAlexander Shishkin 1462ba82664cSAlexander Shishkin return size; 1463ba82664cSAlexander Shishkin } 1464ba82664cSAlexander Shishkin 1465ba82664cSAlexander Shishkin static DEVICE_ATTR_RW(wrap); 1466ba82664cSAlexander Shishkin 1467ba82664cSAlexander Shishkin static ssize_t 1468ba82664cSAlexander Shishkin mode_show(struct device *dev, struct device_attribute *attr, char *buf) 1469ba82664cSAlexander Shishkin { 1470ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1471ba82664cSAlexander Shishkin 1472ba82664cSAlexander Shishkin return scnprintf(buf, PAGE_SIZE, "%s\n", msc_mode[msc->mode]); 1473ba82664cSAlexander Shishkin } 1474ba82664cSAlexander Shishkin 1475ba82664cSAlexander Shishkin static ssize_t 1476ba82664cSAlexander Shishkin mode_store(struct device *dev, struct device_attribute *attr, const char *buf, 1477ba82664cSAlexander Shishkin size_t size) 1478ba82664cSAlexander Shishkin { 1479ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1480ba82664cSAlexander Shishkin size_t len = size; 1481ba82664cSAlexander Shishkin char *cp; 1482ba82664cSAlexander Shishkin int i, ret; 1483ba82664cSAlexander Shishkin 1484ba82664cSAlexander Shishkin if (!capable(CAP_SYS_RAWIO)) 1485ba82664cSAlexander Shishkin return -EPERM; 1486ba82664cSAlexander Shishkin 1487ba82664cSAlexander Shishkin cp = memchr(buf, '\n', len); 1488ba82664cSAlexander Shishkin if (cp) 1489ba82664cSAlexander Shishkin len = cp - buf; 1490ba82664cSAlexander Shishkin 1491ba82664cSAlexander Shishkin for (i = 0; i < ARRAY_SIZE(msc_mode); i++) 1492ba82664cSAlexander Shishkin if (!strncmp(msc_mode[i], buf, len)) 1493ba82664cSAlexander Shishkin goto found; 1494ba82664cSAlexander Shishkin 1495ba82664cSAlexander Shishkin return -EINVAL; 1496ba82664cSAlexander Shishkin 1497ba82664cSAlexander Shishkin found: 1498ba82664cSAlexander Shishkin mutex_lock(&msc->buf_mutex); 1499ba82664cSAlexander Shishkin ret = msc_buffer_unlocked_free_unless_used(msc); 1500ba82664cSAlexander Shishkin if (!ret) 1501ba82664cSAlexander Shishkin msc->mode = i; 1502ba82664cSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 1503ba82664cSAlexander Shishkin 1504ba82664cSAlexander Shishkin return ret ? ret : size; 1505ba82664cSAlexander Shishkin } 1506ba82664cSAlexander Shishkin 1507ba82664cSAlexander Shishkin static DEVICE_ATTR_RW(mode); 1508ba82664cSAlexander Shishkin 1509ba82664cSAlexander Shishkin static ssize_t 1510ba82664cSAlexander Shishkin nr_pages_show(struct device *dev, struct device_attribute *attr, char *buf) 1511ba82664cSAlexander Shishkin { 1512ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1513ba82664cSAlexander Shishkin struct msc_window *win; 1514ba82664cSAlexander Shishkin size_t count = 0; 1515ba82664cSAlexander Shishkin 1516ba82664cSAlexander Shishkin mutex_lock(&msc->buf_mutex); 1517ba82664cSAlexander Shishkin 1518ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) 1519ba82664cSAlexander Shishkin count = scnprintf(buf, PAGE_SIZE, "%ld\n", msc->nr_pages); 1520ba82664cSAlexander Shishkin else if (msc->mode == MSC_MODE_MULTI) { 1521ba82664cSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) { 1522ba82664cSAlexander Shishkin count += scnprintf(buf + count, PAGE_SIZE - count, 1523ba82664cSAlexander Shishkin "%d%c", win->nr_blocks, 1524ba82664cSAlexander Shishkin msc_is_last_win(win) ? '\n' : ','); 1525ba82664cSAlexander Shishkin } 1526ba82664cSAlexander Shishkin } else { 1527ba82664cSAlexander Shishkin count = scnprintf(buf, PAGE_SIZE, "unsupported\n"); 1528ba82664cSAlexander Shishkin } 1529ba82664cSAlexander Shishkin 1530ba82664cSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 1531ba82664cSAlexander Shishkin 1532ba82664cSAlexander Shishkin return count; 1533ba82664cSAlexander Shishkin } 1534ba82664cSAlexander Shishkin 1535ba82664cSAlexander Shishkin static ssize_t 1536ba82664cSAlexander Shishkin nr_pages_store(struct device *dev, struct device_attribute *attr, 1537ba82664cSAlexander Shishkin const char *buf, size_t size) 1538ba82664cSAlexander Shishkin { 1539ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1540ba82664cSAlexander Shishkin unsigned long val, *win = NULL, *rewin; 1541ba82664cSAlexander Shishkin size_t len = size; 1542ba82664cSAlexander Shishkin const char *p = buf; 1543ba82664cSAlexander Shishkin char *end, *s; 1544ba82664cSAlexander Shishkin int ret, nr_wins = 0; 1545ba82664cSAlexander Shishkin 1546ba82664cSAlexander Shishkin if (!capable(CAP_SYS_RAWIO)) 1547ba82664cSAlexander Shishkin return -EPERM; 1548ba82664cSAlexander Shishkin 1549ba82664cSAlexander Shishkin ret = msc_buffer_free_unless_used(msc); 1550ba82664cSAlexander Shishkin if (ret) 1551ba82664cSAlexander Shishkin return ret; 1552ba82664cSAlexander Shishkin 1553ba82664cSAlexander Shishkin /* scan the comma-separated list of allocation sizes */ 1554ba82664cSAlexander Shishkin end = memchr(buf, '\n', len); 1555ba82664cSAlexander Shishkin if (end) 1556ba82664cSAlexander Shishkin len = end - buf; 1557ba82664cSAlexander Shishkin 1558ba82664cSAlexander Shishkin do { 1559ba82664cSAlexander Shishkin end = memchr(p, ',', len); 1560ba82664cSAlexander Shishkin s = kstrndup(p, end ? end - p : len, GFP_KERNEL); 15616575cbd6SAlexander Shishkin if (!s) { 15626575cbd6SAlexander Shishkin ret = -ENOMEM; 15636575cbd6SAlexander Shishkin goto free_win; 15646575cbd6SAlexander Shishkin } 15656575cbd6SAlexander Shishkin 1566ba82664cSAlexander Shishkin ret = kstrtoul(s, 10, &val); 1567ba82664cSAlexander Shishkin kfree(s); 1568ba82664cSAlexander Shishkin 1569ba82664cSAlexander Shishkin if (ret || !val) 1570ba82664cSAlexander Shishkin goto free_win; 1571ba82664cSAlexander Shishkin 1572ba82664cSAlexander Shishkin if (nr_wins && msc->mode == MSC_MODE_SINGLE) { 1573ba82664cSAlexander Shishkin ret = -EINVAL; 1574ba82664cSAlexander Shishkin goto free_win; 1575ba82664cSAlexander Shishkin } 1576ba82664cSAlexander Shishkin 1577ba82664cSAlexander Shishkin nr_wins++; 1578ba82664cSAlexander Shishkin rewin = krealloc(win, sizeof(*win) * nr_wins, GFP_KERNEL); 1579ba82664cSAlexander Shishkin if (!rewin) { 1580ba82664cSAlexander Shishkin kfree(win); 1581ba82664cSAlexander Shishkin return -ENOMEM; 1582ba82664cSAlexander Shishkin } 1583ba82664cSAlexander Shishkin 1584ba82664cSAlexander Shishkin win = rewin; 1585ba82664cSAlexander Shishkin win[nr_wins - 1] = val; 1586ba82664cSAlexander Shishkin 1587ba82664cSAlexander Shishkin if (!end) 1588ba82664cSAlexander Shishkin break; 1589ba82664cSAlexander Shishkin 1590ec5b5ad6SAlexander Shishkin /* consume the number and the following comma, hence +1 */ 1591ec5b5ad6SAlexander Shishkin len -= end - p + 1; 1592ba82664cSAlexander Shishkin p = end + 1; 1593ba82664cSAlexander Shishkin } while (len); 1594ba82664cSAlexander Shishkin 1595ba82664cSAlexander Shishkin mutex_lock(&msc->buf_mutex); 1596ba82664cSAlexander Shishkin ret = msc_buffer_alloc(msc, win, nr_wins); 1597ba82664cSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 1598ba82664cSAlexander Shishkin 1599ba82664cSAlexander Shishkin free_win: 1600ba82664cSAlexander Shishkin kfree(win); 1601ba82664cSAlexander Shishkin 1602ba82664cSAlexander Shishkin return ret ? ret : size; 1603ba82664cSAlexander Shishkin } 1604ba82664cSAlexander Shishkin 1605ba82664cSAlexander Shishkin static DEVICE_ATTR_RW(nr_pages); 1606ba82664cSAlexander Shishkin 16076cac7866SAlexander Shishkin static ssize_t 16086cac7866SAlexander Shishkin win_switch_store(struct device *dev, struct device_attribute *attr, 16096cac7866SAlexander Shishkin const char *buf, size_t size) 16106cac7866SAlexander Shishkin { 16116cac7866SAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 16126cac7866SAlexander Shishkin unsigned long val; 16136cac7866SAlexander Shishkin int ret; 16146cac7866SAlexander Shishkin 16156cac7866SAlexander Shishkin ret = kstrtoul(buf, 10, &val); 16166cac7866SAlexander Shishkin if (ret) 16176cac7866SAlexander Shishkin return ret; 16186cac7866SAlexander Shishkin 16196cac7866SAlexander Shishkin if (val != 1) 16206cac7866SAlexander Shishkin return -EINVAL; 16216cac7866SAlexander Shishkin 16226cac7866SAlexander Shishkin mutex_lock(&msc->buf_mutex); 16236cac7866SAlexander Shishkin if (msc->mode != MSC_MODE_MULTI) 16246cac7866SAlexander Shishkin ret = -ENOTSUPP; 16256cac7866SAlexander Shishkin else 1626aad14ad3SAlexander Shishkin msc_win_switch(msc); 16276cac7866SAlexander Shishkin mutex_unlock(&msc->buf_mutex); 16286cac7866SAlexander Shishkin 16296cac7866SAlexander Shishkin return ret ? ret : size; 16306cac7866SAlexander Shishkin } 16316cac7866SAlexander Shishkin 16326cac7866SAlexander Shishkin static DEVICE_ATTR_WO(win_switch); 16336cac7866SAlexander Shishkin 1634ba82664cSAlexander Shishkin static struct attribute *msc_output_attrs[] = { 1635ba82664cSAlexander Shishkin &dev_attr_wrap.attr, 1636ba82664cSAlexander Shishkin &dev_attr_mode.attr, 1637ba82664cSAlexander Shishkin &dev_attr_nr_pages.attr, 16386cac7866SAlexander Shishkin &dev_attr_win_switch.attr, 1639ba82664cSAlexander Shishkin NULL, 1640ba82664cSAlexander Shishkin }; 1641ba82664cSAlexander Shishkin 1642ba82664cSAlexander Shishkin static struct attribute_group msc_output_group = { 1643ba82664cSAlexander Shishkin .attrs = msc_output_attrs, 1644ba82664cSAlexander Shishkin }; 1645ba82664cSAlexander Shishkin 1646ba82664cSAlexander Shishkin static int intel_th_msc_probe(struct intel_th_device *thdev) 1647ba82664cSAlexander Shishkin { 1648ba82664cSAlexander Shishkin struct device *dev = &thdev->dev; 1649ba82664cSAlexander Shishkin struct resource *res; 1650ba82664cSAlexander Shishkin struct msc *msc; 1651ba82664cSAlexander Shishkin void __iomem *base; 1652ba82664cSAlexander Shishkin int err; 1653ba82664cSAlexander Shishkin 1654ba82664cSAlexander Shishkin res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 0); 1655ba82664cSAlexander Shishkin if (!res) 1656ba82664cSAlexander Shishkin return -ENODEV; 1657ba82664cSAlexander Shishkin 1658ba82664cSAlexander Shishkin base = devm_ioremap(dev, res->start, resource_size(res)); 165973061da0SDan Carpenter if (!base) 166073061da0SDan Carpenter return -ENOMEM; 1661ba82664cSAlexander Shishkin 1662ba82664cSAlexander Shishkin msc = devm_kzalloc(dev, sizeof(*msc), GFP_KERNEL); 1663ba82664cSAlexander Shishkin if (!msc) 1664ba82664cSAlexander Shishkin return -ENOMEM; 1665ba82664cSAlexander Shishkin 1666aac8da65SAlexander Shishkin res = intel_th_device_get_resource(thdev, IORESOURCE_IRQ, 1); 1667aac8da65SAlexander Shishkin if (!res) 1668aac8da65SAlexander Shishkin msc->do_irq = 1; 1669aac8da65SAlexander Shishkin 1670ba82664cSAlexander Shishkin msc->index = thdev->id; 1671ba82664cSAlexander Shishkin 1672ba82664cSAlexander Shishkin msc->thdev = thdev; 1673ba82664cSAlexander Shishkin msc->reg_base = base + msc->index * 0x100; 1674aac8da65SAlexander Shishkin msc->msu_base = base; 1675aac8da65SAlexander Shishkin 1676aac8da65SAlexander Shishkin err = intel_th_msu_init(msc); 1677aac8da65SAlexander Shishkin if (err) 1678aac8da65SAlexander Shishkin return err; 1679ba82664cSAlexander Shishkin 1680ba82664cSAlexander Shishkin err = intel_th_msc_init(msc); 1681ba82664cSAlexander Shishkin if (err) 1682ba82664cSAlexander Shishkin return err; 1683ba82664cSAlexander Shishkin 1684ba82664cSAlexander Shishkin dev_set_drvdata(dev, msc); 1685ba82664cSAlexander Shishkin 1686ba82664cSAlexander Shishkin return 0; 1687ba82664cSAlexander Shishkin } 1688ba82664cSAlexander Shishkin 1689ba82664cSAlexander Shishkin static void intel_th_msc_remove(struct intel_th_device *thdev) 1690ba82664cSAlexander Shishkin { 1691f152dfeeSAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 1692f152dfeeSAlexander Shishkin int ret; 1693f152dfeeSAlexander Shishkin 1694f152dfeeSAlexander Shishkin intel_th_msc_deactivate(thdev); 1695aac8da65SAlexander Shishkin intel_th_msu_deinit(msc); 1696f152dfeeSAlexander Shishkin 1697f152dfeeSAlexander Shishkin /* 1698f152dfeeSAlexander Shishkin * Buffers should not be used at this point except if the 1699f152dfeeSAlexander Shishkin * output character device is still open and the parent 1700f152dfeeSAlexander Shishkin * device gets detached from its bus, which is a FIXME. 1701f152dfeeSAlexander Shishkin */ 1702f152dfeeSAlexander Shishkin ret = msc_buffer_free_unless_used(msc); 1703f152dfeeSAlexander Shishkin WARN_ON_ONCE(ret); 1704ba82664cSAlexander Shishkin } 1705ba82664cSAlexander Shishkin 1706ba82664cSAlexander Shishkin static struct intel_th_driver intel_th_msc_driver = { 1707ba82664cSAlexander Shishkin .probe = intel_th_msc_probe, 1708ba82664cSAlexander Shishkin .remove = intel_th_msc_remove, 1709aac8da65SAlexander Shishkin .irq = intel_th_msc_interrupt, 17108d415512SAlexander Shishkin .wait_empty = intel_th_msc_wait_empty, 1711ba82664cSAlexander Shishkin .activate = intel_th_msc_activate, 1712ba82664cSAlexander Shishkin .deactivate = intel_th_msc_deactivate, 1713ba82664cSAlexander Shishkin .fops = &intel_th_msc_fops, 17149d482aedSAlexander Shishkin .attr_group = &msc_output_group, 1715ba82664cSAlexander Shishkin .driver = { 1716ba82664cSAlexander Shishkin .name = "msc", 1717ba82664cSAlexander Shishkin .owner = THIS_MODULE, 1718ba82664cSAlexander Shishkin }, 1719ba82664cSAlexander Shishkin }; 1720ba82664cSAlexander Shishkin 1721ba82664cSAlexander Shishkin module_driver(intel_th_msc_driver, 1722ba82664cSAlexander Shishkin intel_th_driver_register, 1723ba82664cSAlexander Shishkin intel_th_driver_unregister); 1724ba82664cSAlexander Shishkin 1725ba82664cSAlexander Shishkin MODULE_LICENSE("GPL v2"); 1726ba82664cSAlexander Shishkin MODULE_DESCRIPTION("Intel(R) Trace Hub Memory Storage Unit driver"); 1727ba82664cSAlexander Shishkin MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>"); 1728