150352fa7SAlexander Shishkin // SPDX-License-Identifier: GPL-2.0 2ba82664cSAlexander Shishkin /* 3ba82664cSAlexander Shishkin * Intel(R) Trace Hub Memory Storage Unit 4ba82664cSAlexander Shishkin * 5ba82664cSAlexander Shishkin * Copyright (C) 2014-2015 Intel Corporation. 6ba82664cSAlexander Shishkin */ 7ba82664cSAlexander Shishkin 8ba82664cSAlexander Shishkin #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9ba82664cSAlexander Shishkin 10ba82664cSAlexander Shishkin #include <linux/types.h> 11ba82664cSAlexander Shishkin #include <linux/module.h> 12ba82664cSAlexander Shishkin #include <linux/device.h> 13ba82664cSAlexander Shishkin #include <linux/uaccess.h> 14ba82664cSAlexander Shishkin #include <linux/sizes.h> 15ba82664cSAlexander Shishkin #include <linux/printk.h> 16ba82664cSAlexander Shishkin #include <linux/slab.h> 17ba82664cSAlexander Shishkin #include <linux/mm.h> 18ba82664cSAlexander Shishkin #include <linux/fs.h> 19ba82664cSAlexander Shishkin #include <linux/io.h> 20615c164dSAlexander Shishkin #include <linux/workqueue.h> 21ba82664cSAlexander Shishkin #include <linux/dma-mapping.h> 22ba82664cSAlexander Shishkin 230c14dac9SLaura Abbott #ifdef CONFIG_X86 240c14dac9SLaura Abbott #include <asm/set_memory.h> 250c14dac9SLaura Abbott #endif 26ba82664cSAlexander Shishkin 27615c164dSAlexander Shishkin #include <linux/intel_th.h> 28ba82664cSAlexander Shishkin #include "intel_th.h" 29ba82664cSAlexander Shishkin #include "msu.h" 30ba82664cSAlexander Shishkin 31ba82664cSAlexander Shishkin #define msc_dev(x) (&(x)->thdev->dev) 32ba82664cSAlexander Shishkin 33615c164dSAlexander Shishkin /* 34615c164dSAlexander Shishkin * Lockout state transitions: 35615c164dSAlexander Shishkin * READY -> INUSE -+-> LOCKED -+-> READY -> etc. 36615c164dSAlexander Shishkin * \-----------/ 37615c164dSAlexander Shishkin * WIN_READY: window can be used by HW 38615c164dSAlexander Shishkin * WIN_INUSE: window is in use 39615c164dSAlexander Shishkin * WIN_LOCKED: window is filled up and is being processed by the buffer 40615c164dSAlexander Shishkin * handling code 41615c164dSAlexander Shishkin * 42615c164dSAlexander Shishkin * All state transitions happen automatically, except for the LOCKED->READY, 43615c164dSAlexander Shishkin * which needs to be signalled by the buffer code by calling 44615c164dSAlexander Shishkin * intel_th_msc_window_unlock(). 45615c164dSAlexander Shishkin * 46615c164dSAlexander Shishkin * When the interrupt handler has to switch to the next window, it checks 47615c164dSAlexander Shishkin * whether it's READY, and if it is, it performs the switch and tracing 48615c164dSAlexander Shishkin * continues. If it's LOCKED, it stops the trace. 49615c164dSAlexander Shishkin */ 50615c164dSAlexander Shishkin enum lockout_state { 51615c164dSAlexander Shishkin WIN_READY = 0, 52615c164dSAlexander Shishkin WIN_INUSE, 53615c164dSAlexander Shishkin WIN_LOCKED 54615c164dSAlexander Shishkin }; 55615c164dSAlexander Shishkin 56ba82664cSAlexander Shishkin /** 57ba82664cSAlexander Shishkin * struct msc_window - multiblock mode window descriptor 58ba82664cSAlexander Shishkin * @entry: window list linkage (msc::win_list) 59ba82664cSAlexander Shishkin * @pgoff: page offset into the buffer that this window starts at 60615c164dSAlexander Shishkin * @lockout: lockout state, see comment below 61615c164dSAlexander Shishkin * @lo_lock: lockout state serialization 62ba82664cSAlexander Shishkin * @nr_blocks: number of blocks (pages) in this window 63fa52b3feSAlexander Shishkin * @nr_segs: number of segments in this window (<= @nr_blocks) 64bbbc08a1SAlexander Shishkin * @_sgt: array of block descriptors 65ba39bd83SAlexander Shishkin * @sgt: array of block descriptors 66ba82664cSAlexander Shishkin */ 67ba82664cSAlexander Shishkin struct msc_window { 68ba82664cSAlexander Shishkin struct list_head entry; 69ba82664cSAlexander Shishkin unsigned long pgoff; 70615c164dSAlexander Shishkin enum lockout_state lockout; 71615c164dSAlexander Shishkin spinlock_t lo_lock; 72ba82664cSAlexander Shishkin unsigned int nr_blocks; 73fa52b3feSAlexander Shishkin unsigned int nr_segs; 74ba82664cSAlexander Shishkin struct msc *msc; 75bbbc08a1SAlexander Shishkin struct sg_table _sgt; 76bbbc08a1SAlexander Shishkin struct sg_table *sgt; 77ba82664cSAlexander Shishkin }; 78ba82664cSAlexander Shishkin 79ba82664cSAlexander Shishkin /** 80ba82664cSAlexander Shishkin * struct msc_iter - iterator for msc buffer 81ba82664cSAlexander Shishkin * @entry: msc::iter_list linkage 82ba82664cSAlexander Shishkin * @msc: pointer to the MSC device 83ba82664cSAlexander Shishkin * @start_win: oldest window 84ba82664cSAlexander Shishkin * @win: current window 85ba82664cSAlexander Shishkin * @offset: current logical offset into the buffer 86ba82664cSAlexander Shishkin * @start_block: oldest block in the window 87ba82664cSAlexander Shishkin * @block: block number in the window 88ba82664cSAlexander Shishkin * @block_off: offset into current block 89ba82664cSAlexander Shishkin * @wrap_count: block wrapping handling 90ba82664cSAlexander Shishkin * @eof: end of buffer reached 91ba82664cSAlexander Shishkin */ 92ba82664cSAlexander Shishkin struct msc_iter { 93ba82664cSAlexander Shishkin struct list_head entry; 94ba82664cSAlexander Shishkin struct msc *msc; 95ba82664cSAlexander Shishkin struct msc_window *start_win; 96ba82664cSAlexander Shishkin struct msc_window *win; 97ba82664cSAlexander Shishkin unsigned long offset; 9857b69a1fSAlexander Shishkin struct scatterlist *start_block; 9957b69a1fSAlexander Shishkin struct scatterlist *block; 100ba82664cSAlexander Shishkin unsigned int block_off; 101ba82664cSAlexander Shishkin unsigned int wrap_count; 102ba82664cSAlexander Shishkin unsigned int eof; 103ba82664cSAlexander Shishkin }; 104ba82664cSAlexander Shishkin 105ba82664cSAlexander Shishkin /** 106ba82664cSAlexander Shishkin * struct msc - MSC device representation 107ba82664cSAlexander Shishkin * @reg_base: register window base address 108ba82664cSAlexander Shishkin * @thdev: intel_th_device pointer 109615c164dSAlexander Shishkin * @mbuf: MSU buffer, if assigned 110615c164dSAlexander Shishkin * @mbuf_priv MSU buffer's private data, if @mbuf 111ba82664cSAlexander Shishkin * @win_list: list of windows in multiblock mode 1124e0eaf23SAlexander Shishkin * @single_sgt: single mode buffer 113aad14ad3SAlexander Shishkin * @cur_win: current window 114ba82664cSAlexander Shishkin * @nr_pages: total number of pages allocated for this buffer 115ba82664cSAlexander Shishkin * @single_sz: amount of data in single mode 116ba82664cSAlexander Shishkin * @single_wrap: single mode wrap occurred 117ba82664cSAlexander Shishkin * @base: buffer's base pointer 118ba82664cSAlexander Shishkin * @base_addr: buffer's base address 119ba82664cSAlexander Shishkin * @user_count: number of users of the buffer 120ba82664cSAlexander Shishkin * @mmap_count: number of mappings 121ba82664cSAlexander Shishkin * @buf_mutex: mutex to serialize access to buffer-related bits 122ba82664cSAlexander Shishkin 123ba82664cSAlexander Shishkin * @enabled: MSC is enabled 124ba82664cSAlexander Shishkin * @wrap: wrapping is enabled 125ba82664cSAlexander Shishkin * @mode: MSC operating mode 126ba82664cSAlexander Shishkin * @burst_len: write burst length 127ba82664cSAlexander Shishkin * @index: number of this MSC in the MSU 128ba82664cSAlexander Shishkin */ 129ba82664cSAlexander Shishkin struct msc { 130ba82664cSAlexander Shishkin void __iomem *reg_base; 131aac8da65SAlexander Shishkin void __iomem *msu_base; 132ba82664cSAlexander Shishkin struct intel_th_device *thdev; 133ba82664cSAlexander Shishkin 134615c164dSAlexander Shishkin const struct msu_buffer *mbuf; 135615c164dSAlexander Shishkin void *mbuf_priv; 136615c164dSAlexander Shishkin 137615c164dSAlexander Shishkin struct work_struct work; 138ba82664cSAlexander Shishkin struct list_head win_list; 1394e0eaf23SAlexander Shishkin struct sg_table single_sgt; 140aad14ad3SAlexander Shishkin struct msc_window *cur_win; 1418622dfefSAlexander Shishkin struct msc_window *switch_on_unlock; 142ba82664cSAlexander Shishkin unsigned long nr_pages; 143ba82664cSAlexander Shishkin unsigned long single_sz; 144ba82664cSAlexander Shishkin unsigned int single_wrap : 1; 145ba82664cSAlexander Shishkin void *base; 146ba82664cSAlexander Shishkin dma_addr_t base_addr; 147092f47c3SAlexander Shishkin u32 orig_addr; 148092f47c3SAlexander Shishkin u32 orig_sz; 149ba82664cSAlexander Shishkin 150ba82664cSAlexander Shishkin /* <0: no buffer, 0: no users, >0: active users */ 151ba82664cSAlexander Shishkin atomic_t user_count; 152ba82664cSAlexander Shishkin 153ba82664cSAlexander Shishkin atomic_t mmap_count; 154ba82664cSAlexander Shishkin struct mutex buf_mutex; 155ba82664cSAlexander Shishkin 156ba82664cSAlexander Shishkin struct list_head iter_list; 157ba82664cSAlexander Shishkin 1588622dfefSAlexander Shishkin bool stop_on_full; 1598622dfefSAlexander Shishkin 160ba82664cSAlexander Shishkin /* config */ 161ba82664cSAlexander Shishkin unsigned int enabled : 1, 162aac8da65SAlexander Shishkin wrap : 1, 163397c7729SAlexander Shishkin do_irq : 1, 164397c7729SAlexander Shishkin multi_is_broken : 1; 165ba82664cSAlexander Shishkin unsigned int mode; 166ba82664cSAlexander Shishkin unsigned int burst_len; 167ba82664cSAlexander Shishkin unsigned int index; 168ba82664cSAlexander Shishkin }; 169ba82664cSAlexander Shishkin 170615c164dSAlexander Shishkin static LIST_HEAD(msu_buffer_list); 171e5a340f7SAlexander Shishkin static DEFINE_MUTEX(msu_buffer_mutex); 172615c164dSAlexander Shishkin 173615c164dSAlexander Shishkin /** 174615c164dSAlexander Shishkin * struct msu_buffer_entry - internal MSU buffer bookkeeping 175615c164dSAlexander Shishkin * @entry: link to msu_buffer_list 176615c164dSAlexander Shishkin * @mbuf: MSU buffer object 177615c164dSAlexander Shishkin * @owner: module that provides this MSU buffer 178615c164dSAlexander Shishkin */ 179615c164dSAlexander Shishkin struct msu_buffer_entry { 180615c164dSAlexander Shishkin struct list_head entry; 181615c164dSAlexander Shishkin const struct msu_buffer *mbuf; 182615c164dSAlexander Shishkin struct module *owner; 183615c164dSAlexander Shishkin }; 184615c164dSAlexander Shishkin 185615c164dSAlexander Shishkin static struct msu_buffer_entry *__msu_buffer_entry_find(const char *name) 186615c164dSAlexander Shishkin { 187615c164dSAlexander Shishkin struct msu_buffer_entry *mbe; 188615c164dSAlexander Shishkin 189615c164dSAlexander Shishkin lockdep_assert_held(&msu_buffer_mutex); 190615c164dSAlexander Shishkin 191615c164dSAlexander Shishkin list_for_each_entry(mbe, &msu_buffer_list, entry) { 192615c164dSAlexander Shishkin if (!strcmp(mbe->mbuf->name, name)) 193615c164dSAlexander Shishkin return mbe; 194615c164dSAlexander Shishkin } 195615c164dSAlexander Shishkin 196615c164dSAlexander Shishkin return NULL; 197615c164dSAlexander Shishkin } 198615c164dSAlexander Shishkin 199615c164dSAlexander Shishkin static const struct msu_buffer * 200615c164dSAlexander Shishkin msu_buffer_get(const char *name) 201615c164dSAlexander Shishkin { 202615c164dSAlexander Shishkin struct msu_buffer_entry *mbe; 203615c164dSAlexander Shishkin 204615c164dSAlexander Shishkin mutex_lock(&msu_buffer_mutex); 205615c164dSAlexander Shishkin mbe = __msu_buffer_entry_find(name); 206615c164dSAlexander Shishkin if (mbe && !try_module_get(mbe->owner)) 207615c164dSAlexander Shishkin mbe = NULL; 208615c164dSAlexander Shishkin mutex_unlock(&msu_buffer_mutex); 209615c164dSAlexander Shishkin 210615c164dSAlexander Shishkin return mbe ? mbe->mbuf : NULL; 211615c164dSAlexander Shishkin } 212615c164dSAlexander Shishkin 213615c164dSAlexander Shishkin static void msu_buffer_put(const struct msu_buffer *mbuf) 214615c164dSAlexander Shishkin { 215615c164dSAlexander Shishkin struct msu_buffer_entry *mbe; 216615c164dSAlexander Shishkin 217615c164dSAlexander Shishkin mutex_lock(&msu_buffer_mutex); 218615c164dSAlexander Shishkin mbe = __msu_buffer_entry_find(mbuf->name); 219615c164dSAlexander Shishkin if (mbe) 220615c164dSAlexander Shishkin module_put(mbe->owner); 221615c164dSAlexander Shishkin mutex_unlock(&msu_buffer_mutex); 222615c164dSAlexander Shishkin } 223615c164dSAlexander Shishkin 224615c164dSAlexander Shishkin int intel_th_msu_buffer_register(const struct msu_buffer *mbuf, 225615c164dSAlexander Shishkin struct module *owner) 226615c164dSAlexander Shishkin { 227615c164dSAlexander Shishkin struct msu_buffer_entry *mbe; 228615c164dSAlexander Shishkin int ret = 0; 229615c164dSAlexander Shishkin 230615c164dSAlexander Shishkin mbe = kzalloc(sizeof(*mbe), GFP_KERNEL); 231615c164dSAlexander Shishkin if (!mbe) 232615c164dSAlexander Shishkin return -ENOMEM; 233615c164dSAlexander Shishkin 234615c164dSAlexander Shishkin mutex_lock(&msu_buffer_mutex); 235615c164dSAlexander Shishkin if (__msu_buffer_entry_find(mbuf->name)) { 236615c164dSAlexander Shishkin ret = -EEXIST; 237615c164dSAlexander Shishkin kfree(mbe); 238615c164dSAlexander Shishkin goto unlock; 239615c164dSAlexander Shishkin } 240615c164dSAlexander Shishkin 241615c164dSAlexander Shishkin mbe->mbuf = mbuf; 242615c164dSAlexander Shishkin mbe->owner = owner; 243615c164dSAlexander Shishkin list_add_tail(&mbe->entry, &msu_buffer_list); 244615c164dSAlexander Shishkin unlock: 245615c164dSAlexander Shishkin mutex_unlock(&msu_buffer_mutex); 246615c164dSAlexander Shishkin 247615c164dSAlexander Shishkin return ret; 248615c164dSAlexander Shishkin } 249615c164dSAlexander Shishkin EXPORT_SYMBOL_GPL(intel_th_msu_buffer_register); 250615c164dSAlexander Shishkin 251615c164dSAlexander Shishkin void intel_th_msu_buffer_unregister(const struct msu_buffer *mbuf) 252615c164dSAlexander Shishkin { 253615c164dSAlexander Shishkin struct msu_buffer_entry *mbe; 254615c164dSAlexander Shishkin 255615c164dSAlexander Shishkin mutex_lock(&msu_buffer_mutex); 256615c164dSAlexander Shishkin mbe = __msu_buffer_entry_find(mbuf->name); 257615c164dSAlexander Shishkin if (mbe) { 258615c164dSAlexander Shishkin list_del(&mbe->entry); 259615c164dSAlexander Shishkin kfree(mbe); 260615c164dSAlexander Shishkin } 261615c164dSAlexander Shishkin mutex_unlock(&msu_buffer_mutex); 262615c164dSAlexander Shishkin } 263615c164dSAlexander Shishkin EXPORT_SYMBOL_GPL(intel_th_msu_buffer_unregister); 264615c164dSAlexander Shishkin 265ba82664cSAlexander Shishkin static inline bool msc_block_is_empty(struct msc_block_desc *bdesc) 266ba82664cSAlexander Shishkin { 267ba82664cSAlexander Shishkin /* header hasn't been written */ 268ba82664cSAlexander Shishkin if (!bdesc->valid_dw) 269ba82664cSAlexander Shishkin return true; 270ba82664cSAlexander Shishkin 271ba82664cSAlexander Shishkin /* valid_dw includes the header */ 272ba82664cSAlexander Shishkin if (!msc_data_sz(bdesc)) 273ba82664cSAlexander Shishkin return true; 274ba82664cSAlexander Shishkin 275ba82664cSAlexander Shishkin return false; 276ba82664cSAlexander Shishkin } 277ba82664cSAlexander Shishkin 27857b69a1fSAlexander Shishkin static inline struct scatterlist *msc_win_base_sg(struct msc_window *win) 279ba39bd83SAlexander Shishkin { 28057b69a1fSAlexander Shishkin return win->sgt->sgl; 281ba39bd83SAlexander Shishkin } 282ba39bd83SAlexander Shishkin 28357b69a1fSAlexander Shishkin static inline struct msc_block_desc *msc_win_base(struct msc_window *win) 284fa52b3feSAlexander Shishkin { 28557b69a1fSAlexander Shishkin return sg_virt(msc_win_base_sg(win)); 286fa52b3feSAlexander Shishkin } 287fa52b3feSAlexander Shishkin 28857b69a1fSAlexander Shishkin static inline dma_addr_t msc_win_base_dma(struct msc_window *win) 289ba39bd83SAlexander Shishkin { 29057b69a1fSAlexander Shishkin return sg_dma_address(msc_win_base_sg(win)); 291ba39bd83SAlexander Shishkin } 292ba39bd83SAlexander Shishkin 293ba39bd83SAlexander Shishkin static inline unsigned long 29457b69a1fSAlexander Shishkin msc_win_base_pfn(struct msc_window *win) 295ba39bd83SAlexander Shishkin { 29657b69a1fSAlexander Shishkin return PFN_DOWN(msc_win_base_dma(win)); 297ba39bd83SAlexander Shishkin } 298ba39bd83SAlexander Shishkin 299ba82664cSAlexander Shishkin /** 300aad14ad3SAlexander Shishkin * msc_is_last_win() - check if a window is the last one for a given MSC 301aad14ad3SAlexander Shishkin * @win: window 302aad14ad3SAlexander Shishkin * Return: true if @win is the last window in MSC's multiblock buffer 303aad14ad3SAlexander Shishkin */ 304aad14ad3SAlexander Shishkin static inline bool msc_is_last_win(struct msc_window *win) 305aad14ad3SAlexander Shishkin { 306aad14ad3SAlexander Shishkin return win->entry.next == &win->msc->win_list; 307aad14ad3SAlexander Shishkin } 308aad14ad3SAlexander Shishkin 309aad14ad3SAlexander Shishkin /** 310aad14ad3SAlexander Shishkin * msc_next_window() - return next window in the multiblock buffer 311aad14ad3SAlexander Shishkin * @win: current window 312aad14ad3SAlexander Shishkin * 313aad14ad3SAlexander Shishkin * Return: window following the current one 314aad14ad3SAlexander Shishkin */ 315aad14ad3SAlexander Shishkin static struct msc_window *msc_next_window(struct msc_window *win) 316aad14ad3SAlexander Shishkin { 317aad14ad3SAlexander Shishkin if (msc_is_last_win(win)) 318aad14ad3SAlexander Shishkin return list_first_entry(&win->msc->win_list, struct msc_window, 319aad14ad3SAlexander Shishkin entry); 320aad14ad3SAlexander Shishkin 321aad14ad3SAlexander Shishkin return list_next_entry(win, entry); 322aad14ad3SAlexander Shishkin } 323aad14ad3SAlexander Shishkin 324615c164dSAlexander Shishkin static size_t msc_win_total_sz(struct msc_window *win) 325615c164dSAlexander Shishkin { 32657b69a1fSAlexander Shishkin struct scatterlist *sg; 327615c164dSAlexander Shishkin unsigned int blk; 328615c164dSAlexander Shishkin size_t size = 0; 329615c164dSAlexander Shishkin 33057b69a1fSAlexander Shishkin for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) { 33157b69a1fSAlexander Shishkin struct msc_block_desc *bdesc = sg_virt(sg); 332615c164dSAlexander Shishkin 333615c164dSAlexander Shishkin if (msc_block_wrapped(bdesc)) 3348e3ef7b4SColin Ian King return (size_t)win->nr_blocks << PAGE_SHIFT; 335615c164dSAlexander Shishkin 336615c164dSAlexander Shishkin size += msc_total_sz(bdesc); 337615c164dSAlexander Shishkin if (msc_block_last_written(bdesc)) 338615c164dSAlexander Shishkin break; 339615c164dSAlexander Shishkin } 340615c164dSAlexander Shishkin 341615c164dSAlexander Shishkin return size; 342615c164dSAlexander Shishkin } 343615c164dSAlexander Shishkin 344aad14ad3SAlexander Shishkin /** 345f505e91eSAlexander Shishkin * msc_find_window() - find a window matching a given sg_table 346ba82664cSAlexander Shishkin * @msc: MSC device 347f505e91eSAlexander Shishkin * @sgt: SG table of the window 348f505e91eSAlexander Shishkin * @nonempty: skip over empty windows 349ba82664cSAlexander Shishkin * 350f505e91eSAlexander Shishkin * Return: MSC window structure pointer or NULL if the window 351f505e91eSAlexander Shishkin * could not be found. 352ba82664cSAlexander Shishkin */ 353f505e91eSAlexander Shishkin static struct msc_window * 354f505e91eSAlexander Shishkin msc_find_window(struct msc *msc, struct sg_table *sgt, bool nonempty) 355ba82664cSAlexander Shishkin { 356f505e91eSAlexander Shishkin struct msc_window *win; 357ba82664cSAlexander Shishkin unsigned int found = 0; 358ba82664cSAlexander Shishkin 359ba82664cSAlexander Shishkin if (list_empty(&msc->win_list)) 360ba82664cSAlexander Shishkin return NULL; 361ba82664cSAlexander Shishkin 362ba82664cSAlexander Shishkin /* 363ba82664cSAlexander Shishkin * we might need a radix tree for this, depending on how 364ba82664cSAlexander Shishkin * many windows a typical user would allocate; ideally it's 365ba82664cSAlexander Shishkin * something like 2, in which case we're good 366ba82664cSAlexander Shishkin */ 367ba82664cSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) { 368f505e91eSAlexander Shishkin if (win->sgt == sgt) 369ba82664cSAlexander Shishkin found++; 370ba82664cSAlexander Shishkin 371ba82664cSAlexander Shishkin /* skip the empty ones */ 37257b69a1fSAlexander Shishkin if (nonempty && msc_block_is_empty(msc_win_base(win))) 373ba82664cSAlexander Shishkin continue; 374ba82664cSAlexander Shishkin 375ba82664cSAlexander Shishkin if (found) 376ba82664cSAlexander Shishkin return win; 377ba82664cSAlexander Shishkin } 378ba82664cSAlexander Shishkin 379f505e91eSAlexander Shishkin return NULL; 380f505e91eSAlexander Shishkin } 381f505e91eSAlexander Shishkin 382f505e91eSAlexander Shishkin /** 383f505e91eSAlexander Shishkin * msc_oldest_window() - locate the window with oldest data 384f505e91eSAlexander Shishkin * @msc: MSC device 385f505e91eSAlexander Shishkin * 386f505e91eSAlexander Shishkin * This should only be used in multiblock mode. Caller should hold the 387f505e91eSAlexander Shishkin * msc::user_count reference. 388f505e91eSAlexander Shishkin * 389f505e91eSAlexander Shishkin * Return: the oldest window with valid data 390f505e91eSAlexander Shishkin */ 391f505e91eSAlexander Shishkin static struct msc_window *msc_oldest_window(struct msc *msc) 392f505e91eSAlexander Shishkin { 393f505e91eSAlexander Shishkin struct msc_window *win; 394f505e91eSAlexander Shishkin 395f505e91eSAlexander Shishkin if (list_empty(&msc->win_list)) 396f505e91eSAlexander Shishkin return NULL; 397f505e91eSAlexander Shishkin 398f505e91eSAlexander Shishkin win = msc_find_window(msc, msc_next_window(msc->cur_win)->sgt, true); 399f505e91eSAlexander Shishkin if (win) 400f505e91eSAlexander Shishkin return win; 401f505e91eSAlexander Shishkin 4020de9e035SAlexander Shishkin return list_first_entry(&msc->win_list, struct msc_window, entry); 403ba82664cSAlexander Shishkin } 404ba82664cSAlexander Shishkin 405ba82664cSAlexander Shishkin /** 40657b69a1fSAlexander Shishkin * msc_win_oldest_sg() - locate the oldest block in a given window 407ba82664cSAlexander Shishkin * @win: window to look at 408ba82664cSAlexander Shishkin * 409ba82664cSAlexander Shishkin * Return: index of the block with the oldest data 410ba82664cSAlexander Shishkin */ 41157b69a1fSAlexander Shishkin static struct scatterlist *msc_win_oldest_sg(struct msc_window *win) 412ba82664cSAlexander Shishkin { 413ba82664cSAlexander Shishkin unsigned int blk; 41457b69a1fSAlexander Shishkin struct scatterlist *sg; 41557b69a1fSAlexander Shishkin struct msc_block_desc *bdesc = msc_win_base(win); 416ba82664cSAlexander Shishkin 417ba82664cSAlexander Shishkin /* without wrapping, first block is the oldest */ 418ba82664cSAlexander Shishkin if (!msc_block_wrapped(bdesc)) 41957b69a1fSAlexander Shishkin return msc_win_base_sg(win); 420ba82664cSAlexander Shishkin 421ba82664cSAlexander Shishkin /* 422ba82664cSAlexander Shishkin * with wrapping, last written block contains both the newest and the 423ba82664cSAlexander Shishkin * oldest data for this window. 424ba82664cSAlexander Shishkin */ 42557b69a1fSAlexander Shishkin for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) { 42657b69a1fSAlexander Shishkin struct msc_block_desc *bdesc = sg_virt(sg); 427ba82664cSAlexander Shishkin 428ba82664cSAlexander Shishkin if (msc_block_last_written(bdesc)) 42957b69a1fSAlexander Shishkin return sg; 430ba82664cSAlexander Shishkin } 431ba82664cSAlexander Shishkin 43257b69a1fSAlexander Shishkin return msc_win_base_sg(win); 433ba82664cSAlexander Shishkin } 434ba82664cSAlexander Shishkin 435ba82664cSAlexander Shishkin static struct msc_block_desc *msc_iter_bdesc(struct msc_iter *iter) 436ba82664cSAlexander Shishkin { 43757b69a1fSAlexander Shishkin return sg_virt(iter->block); 438ba82664cSAlexander Shishkin } 439ba82664cSAlexander Shishkin 440ba82664cSAlexander Shishkin static struct msc_iter *msc_iter_install(struct msc *msc) 441ba82664cSAlexander Shishkin { 442ba82664cSAlexander Shishkin struct msc_iter *iter; 443ba82664cSAlexander Shishkin 444ba82664cSAlexander Shishkin iter = kzalloc(sizeof(*iter), GFP_KERNEL); 445ba82664cSAlexander Shishkin if (!iter) 446a45ff6edSAlexander Shishkin return ERR_PTR(-ENOMEM); 447a45ff6edSAlexander Shishkin 448a45ff6edSAlexander Shishkin mutex_lock(&msc->buf_mutex); 449a45ff6edSAlexander Shishkin 450a45ff6edSAlexander Shishkin /* 451a45ff6edSAlexander Shishkin * Reading and tracing are mutually exclusive; if msc is 452a45ff6edSAlexander Shishkin * enabled, open() will fail; otherwise existing readers 453a45ff6edSAlexander Shishkin * will prevent enabling the msc and the rest of fops don't 454a45ff6edSAlexander Shishkin * need to worry about it. 455a45ff6edSAlexander Shishkin */ 456a45ff6edSAlexander Shishkin if (msc->enabled) { 457a45ff6edSAlexander Shishkin kfree(iter); 458a45ff6edSAlexander Shishkin iter = ERR_PTR(-EBUSY); 459a45ff6edSAlexander Shishkin goto unlock; 460a45ff6edSAlexander Shishkin } 461ba82664cSAlexander Shishkin 462ba82664cSAlexander Shishkin iter->msc = msc; 463ba82664cSAlexander Shishkin 464ba82664cSAlexander Shishkin list_add_tail(&iter->entry, &msc->iter_list); 465a45ff6edSAlexander Shishkin unlock: 466a45ff6edSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 467ba82664cSAlexander Shishkin 468ba82664cSAlexander Shishkin return iter; 469ba82664cSAlexander Shishkin } 470ba82664cSAlexander Shishkin 471ba82664cSAlexander Shishkin static void msc_iter_remove(struct msc_iter *iter, struct msc *msc) 472ba82664cSAlexander Shishkin { 473a45ff6edSAlexander Shishkin mutex_lock(&msc->buf_mutex); 474ba82664cSAlexander Shishkin list_del(&iter->entry); 475a45ff6edSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 476ba82664cSAlexander Shishkin 477ba82664cSAlexander Shishkin kfree(iter); 478ba82664cSAlexander Shishkin } 479ba82664cSAlexander Shishkin 480ba82664cSAlexander Shishkin static void msc_iter_block_start(struct msc_iter *iter) 481ba82664cSAlexander Shishkin { 48257b69a1fSAlexander Shishkin if (iter->start_block) 483ba82664cSAlexander Shishkin return; 484ba82664cSAlexander Shishkin 48557b69a1fSAlexander Shishkin iter->start_block = msc_win_oldest_sg(iter->win); 486ba82664cSAlexander Shishkin iter->block = iter->start_block; 487ba82664cSAlexander Shishkin iter->wrap_count = 0; 488ba82664cSAlexander Shishkin 489ba82664cSAlexander Shishkin /* 490ba82664cSAlexander Shishkin * start with the block with oldest data; if data has wrapped 491ba82664cSAlexander Shishkin * in this window, it should be in this block 492ba82664cSAlexander Shishkin */ 493ba82664cSAlexander Shishkin if (msc_block_wrapped(msc_iter_bdesc(iter))) 494ba82664cSAlexander Shishkin iter->wrap_count = 2; 495ba82664cSAlexander Shishkin 496ba82664cSAlexander Shishkin } 497ba82664cSAlexander Shishkin 498ba82664cSAlexander Shishkin static int msc_iter_win_start(struct msc_iter *iter, struct msc *msc) 499ba82664cSAlexander Shishkin { 500ba82664cSAlexander Shishkin /* already started, nothing to do */ 501ba82664cSAlexander Shishkin if (iter->start_win) 502ba82664cSAlexander Shishkin return 0; 503ba82664cSAlexander Shishkin 504ba82664cSAlexander Shishkin iter->start_win = msc_oldest_window(msc); 505ba82664cSAlexander Shishkin if (!iter->start_win) 506ba82664cSAlexander Shishkin return -EINVAL; 507ba82664cSAlexander Shishkin 508ba82664cSAlexander Shishkin iter->win = iter->start_win; 50957b69a1fSAlexander Shishkin iter->start_block = NULL; 510ba82664cSAlexander Shishkin 511ba82664cSAlexander Shishkin msc_iter_block_start(iter); 512ba82664cSAlexander Shishkin 513ba82664cSAlexander Shishkin return 0; 514ba82664cSAlexander Shishkin } 515ba82664cSAlexander Shishkin 516ba82664cSAlexander Shishkin static int msc_iter_win_advance(struct msc_iter *iter) 517ba82664cSAlexander Shishkin { 518ba82664cSAlexander Shishkin iter->win = msc_next_window(iter->win); 51957b69a1fSAlexander Shishkin iter->start_block = NULL; 520ba82664cSAlexander Shishkin 521ba82664cSAlexander Shishkin if (iter->win == iter->start_win) { 522ba82664cSAlexander Shishkin iter->eof++; 523ba82664cSAlexander Shishkin return 1; 524ba82664cSAlexander Shishkin } 525ba82664cSAlexander Shishkin 526ba82664cSAlexander Shishkin msc_iter_block_start(iter); 527ba82664cSAlexander Shishkin 528ba82664cSAlexander Shishkin return 0; 529ba82664cSAlexander Shishkin } 530ba82664cSAlexander Shishkin 531ba82664cSAlexander Shishkin static int msc_iter_block_advance(struct msc_iter *iter) 532ba82664cSAlexander Shishkin { 533ba82664cSAlexander Shishkin iter->block_off = 0; 534ba82664cSAlexander Shishkin 535ba82664cSAlexander Shishkin /* wrapping */ 536ba82664cSAlexander Shishkin if (iter->wrap_count && iter->block == iter->start_block) { 537ba82664cSAlexander Shishkin iter->wrap_count--; 538ba82664cSAlexander Shishkin if (!iter->wrap_count) 539ba82664cSAlexander Shishkin /* copied newest data from the wrapped block */ 540ba82664cSAlexander Shishkin return msc_iter_win_advance(iter); 541ba82664cSAlexander Shishkin } 542ba82664cSAlexander Shishkin 543ba82664cSAlexander Shishkin /* no wrapping, check for last written block */ 544ba82664cSAlexander Shishkin if (!iter->wrap_count && msc_block_last_written(msc_iter_bdesc(iter))) 545ba82664cSAlexander Shishkin /* copied newest data for the window */ 546ba82664cSAlexander Shishkin return msc_iter_win_advance(iter); 547ba82664cSAlexander Shishkin 548ba82664cSAlexander Shishkin /* block advance */ 54957b69a1fSAlexander Shishkin if (sg_is_last(iter->block)) 55057b69a1fSAlexander Shishkin iter->block = msc_win_base_sg(iter->win); 55157b69a1fSAlexander Shishkin else 55257b69a1fSAlexander Shishkin iter->block = sg_next(iter->block); 553ba82664cSAlexander Shishkin 554ba82664cSAlexander Shishkin /* no wrapping, sanity check in case there is no last written block */ 555ba82664cSAlexander Shishkin if (!iter->wrap_count && iter->block == iter->start_block) 556ba82664cSAlexander Shishkin return msc_iter_win_advance(iter); 557ba82664cSAlexander Shishkin 558ba82664cSAlexander Shishkin return 0; 559ba82664cSAlexander Shishkin } 560ba82664cSAlexander Shishkin 561ba82664cSAlexander Shishkin /** 562ba82664cSAlexander Shishkin * msc_buffer_iterate() - go through multiblock buffer's data 563ba82664cSAlexander Shishkin * @iter: iterator structure 564ba82664cSAlexander Shishkin * @size: amount of data to scan 565ba82664cSAlexander Shishkin * @data: callback's private data 566ba82664cSAlexander Shishkin * @fn: iterator callback 567ba82664cSAlexander Shishkin * 568ba82664cSAlexander Shishkin * This will start at the window which will be written to next (containing 569ba82664cSAlexander Shishkin * the oldest data) and work its way to the current window, calling @fn 570ba82664cSAlexander Shishkin * for each chunk of data as it goes. 571ba82664cSAlexander Shishkin * 572ba82664cSAlexander Shishkin * Caller should have msc::user_count reference to make sure the buffer 573ba82664cSAlexander Shishkin * doesn't disappear from under us. 574ba82664cSAlexander Shishkin * 575ba82664cSAlexander Shishkin * Return: amount of data actually scanned. 576ba82664cSAlexander Shishkin */ 577ba82664cSAlexander Shishkin static ssize_t 578ba82664cSAlexander Shishkin msc_buffer_iterate(struct msc_iter *iter, size_t size, void *data, 579ba82664cSAlexander Shishkin unsigned long (*fn)(void *, void *, size_t)) 580ba82664cSAlexander Shishkin { 581ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 582ba82664cSAlexander Shishkin size_t len = size; 583ba82664cSAlexander Shishkin unsigned int advance; 584ba82664cSAlexander Shishkin 585ba82664cSAlexander Shishkin if (iter->eof) 586ba82664cSAlexander Shishkin return 0; 587ba82664cSAlexander Shishkin 588ba82664cSAlexander Shishkin /* start with the oldest window */ 589ba82664cSAlexander Shishkin if (msc_iter_win_start(iter, msc)) 590ba82664cSAlexander Shishkin return 0; 591ba82664cSAlexander Shishkin 592ba82664cSAlexander Shishkin do { 593ba82664cSAlexander Shishkin unsigned long data_bytes = msc_data_sz(msc_iter_bdesc(iter)); 594ba82664cSAlexander Shishkin void *src = (void *)msc_iter_bdesc(iter) + MSC_BDESC; 595ba82664cSAlexander Shishkin size_t tocopy = data_bytes, copied = 0; 596ba82664cSAlexander Shishkin size_t remaining = 0; 597ba82664cSAlexander Shishkin 598ba82664cSAlexander Shishkin advance = 1; 599ba82664cSAlexander Shishkin 600ba82664cSAlexander Shishkin /* 601ba82664cSAlexander Shishkin * If block wrapping happened, we need to visit the last block 602ba82664cSAlexander Shishkin * twice, because it contains both the oldest and the newest 603ba82664cSAlexander Shishkin * data in this window. 604ba82664cSAlexander Shishkin * 605ba82664cSAlexander Shishkin * First time (wrap_count==2), in the very beginning, to collect 606ba82664cSAlexander Shishkin * the oldest data, which is in the range 607ba82664cSAlexander Shishkin * (data_bytes..DATA_IN_PAGE). 608ba82664cSAlexander Shishkin * 609ba82664cSAlexander Shishkin * Second time (wrap_count==1), it's just like any other block, 610ba82664cSAlexander Shishkin * containing data in the range of [MSC_BDESC..data_bytes]. 611ba82664cSAlexander Shishkin */ 612e4eca2a1SLaurent FERT if (iter->block == iter->start_block && iter->wrap_count == 2) { 613ba82664cSAlexander Shishkin tocopy = DATA_IN_PAGE - data_bytes; 614ba82664cSAlexander Shishkin src += data_bytes; 615ba82664cSAlexander Shishkin } 616ba82664cSAlexander Shishkin 617ba82664cSAlexander Shishkin if (!tocopy) 618ba82664cSAlexander Shishkin goto next_block; 619ba82664cSAlexander Shishkin 620ba82664cSAlexander Shishkin tocopy -= iter->block_off; 621ba82664cSAlexander Shishkin src += iter->block_off; 622ba82664cSAlexander Shishkin 623ba82664cSAlexander Shishkin if (len < tocopy) { 624ba82664cSAlexander Shishkin tocopy = len; 625ba82664cSAlexander Shishkin advance = 0; 626ba82664cSAlexander Shishkin } 627ba82664cSAlexander Shishkin 628ba82664cSAlexander Shishkin remaining = fn(data, src, tocopy); 629ba82664cSAlexander Shishkin 630ba82664cSAlexander Shishkin if (remaining) 631ba82664cSAlexander Shishkin advance = 0; 632ba82664cSAlexander Shishkin 633ba82664cSAlexander Shishkin copied = tocopy - remaining; 634ba82664cSAlexander Shishkin len -= copied; 635ba82664cSAlexander Shishkin iter->block_off += copied; 636ba82664cSAlexander Shishkin iter->offset += copied; 637ba82664cSAlexander Shishkin 638ba82664cSAlexander Shishkin if (!advance) 639ba82664cSAlexander Shishkin break; 640ba82664cSAlexander Shishkin 641ba82664cSAlexander Shishkin next_block: 642ba82664cSAlexander Shishkin if (msc_iter_block_advance(iter)) 643ba82664cSAlexander Shishkin break; 644ba82664cSAlexander Shishkin 645ba82664cSAlexander Shishkin } while (len); 646ba82664cSAlexander Shishkin 647ba82664cSAlexander Shishkin return size - len; 648ba82664cSAlexander Shishkin } 649ba82664cSAlexander Shishkin 650ba82664cSAlexander Shishkin /** 651ba82664cSAlexander Shishkin * msc_buffer_clear_hw_header() - clear hw header for multiblock 652ba82664cSAlexander Shishkin * @msc: MSC device 653ba82664cSAlexander Shishkin */ 654ba82664cSAlexander Shishkin static void msc_buffer_clear_hw_header(struct msc *msc) 655ba82664cSAlexander Shishkin { 656ba82664cSAlexander Shishkin struct msc_window *win; 65757b69a1fSAlexander Shishkin struct scatterlist *sg; 658ba82664cSAlexander Shishkin 659ba82664cSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) { 660ba82664cSAlexander Shishkin unsigned int blk; 661ba82664cSAlexander Shishkin 66257b69a1fSAlexander Shishkin for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) { 66357b69a1fSAlexander Shishkin struct msc_block_desc *bdesc = sg_virt(sg); 664ba82664cSAlexander Shishkin 6659ed0a59cSKees Cook memset_startat(bdesc, 0, hw_tag); 666ba82664cSAlexander Shishkin } 667ba82664cSAlexander Shishkin } 668ba82664cSAlexander Shishkin } 669ba82664cSAlexander Shishkin 670aac8da65SAlexander Shishkin static int intel_th_msu_init(struct msc *msc) 671aac8da65SAlexander Shishkin { 672aac8da65SAlexander Shishkin u32 mintctl, msusts; 673aac8da65SAlexander Shishkin 674aac8da65SAlexander Shishkin if (!msc->do_irq) 675aac8da65SAlexander Shishkin return 0; 676aac8da65SAlexander Shishkin 677615c164dSAlexander Shishkin if (!msc->mbuf) 678615c164dSAlexander Shishkin return 0; 679615c164dSAlexander Shishkin 680aac8da65SAlexander Shishkin mintctl = ioread32(msc->msu_base + REG_MSU_MINTCTL); 681aac8da65SAlexander Shishkin mintctl |= msc->index ? M1BLIE : M0BLIE; 682aac8da65SAlexander Shishkin iowrite32(mintctl, msc->msu_base + REG_MSU_MINTCTL); 683aac8da65SAlexander Shishkin if (mintctl != ioread32(msc->msu_base + REG_MSU_MINTCTL)) { 684aac8da65SAlexander Shishkin dev_info(msc_dev(msc), "MINTCTL ignores writes: no usable interrupts\n"); 685aac8da65SAlexander Shishkin msc->do_irq = 0; 686aac8da65SAlexander Shishkin return 0; 687aac8da65SAlexander Shishkin } 688aac8da65SAlexander Shishkin 689aac8da65SAlexander Shishkin msusts = ioread32(msc->msu_base + REG_MSU_MSUSTS); 690aac8da65SAlexander Shishkin iowrite32(msusts, msc->msu_base + REG_MSU_MSUSTS); 691aac8da65SAlexander Shishkin 692aac8da65SAlexander Shishkin return 0; 693aac8da65SAlexander Shishkin } 694aac8da65SAlexander Shishkin 695aac8da65SAlexander Shishkin static void intel_th_msu_deinit(struct msc *msc) 696aac8da65SAlexander Shishkin { 697aac8da65SAlexander Shishkin u32 mintctl; 698aac8da65SAlexander Shishkin 699aac8da65SAlexander Shishkin if (!msc->do_irq) 700aac8da65SAlexander Shishkin return; 701aac8da65SAlexander Shishkin 702aac8da65SAlexander Shishkin mintctl = ioread32(msc->msu_base + REG_MSU_MINTCTL); 703aac8da65SAlexander Shishkin mintctl &= msc->index ? ~M1BLIE : ~M0BLIE; 704aac8da65SAlexander Shishkin iowrite32(mintctl, msc->msu_base + REG_MSU_MINTCTL); 705aac8da65SAlexander Shishkin } 706aac8da65SAlexander Shishkin 707615c164dSAlexander Shishkin static int msc_win_set_lockout(struct msc_window *win, 708615c164dSAlexander Shishkin enum lockout_state expect, 709615c164dSAlexander Shishkin enum lockout_state new) 710615c164dSAlexander Shishkin { 711615c164dSAlexander Shishkin enum lockout_state old; 712615c164dSAlexander Shishkin unsigned long flags; 713615c164dSAlexander Shishkin int ret = 0; 714615c164dSAlexander Shishkin 715615c164dSAlexander Shishkin if (!win->msc->mbuf) 716615c164dSAlexander Shishkin return 0; 717615c164dSAlexander Shishkin 718615c164dSAlexander Shishkin spin_lock_irqsave(&win->lo_lock, flags); 719615c164dSAlexander Shishkin old = win->lockout; 720615c164dSAlexander Shishkin 721615c164dSAlexander Shishkin if (old != expect) { 722615c164dSAlexander Shishkin ret = -EINVAL; 723615c164dSAlexander Shishkin goto unlock; 724615c164dSAlexander Shishkin } 725615c164dSAlexander Shishkin 726615c164dSAlexander Shishkin win->lockout = new; 727615c164dSAlexander Shishkin 728ed5207afSAlexander Shishkin if (old == expect && new == WIN_LOCKED) 729ed5207afSAlexander Shishkin atomic_inc(&win->msc->user_count); 730ed5207afSAlexander Shishkin else if (old == expect && old == WIN_LOCKED) 731ed5207afSAlexander Shishkin atomic_dec(&win->msc->user_count); 732ed5207afSAlexander Shishkin 733615c164dSAlexander Shishkin unlock: 734615c164dSAlexander Shishkin spin_unlock_irqrestore(&win->lo_lock, flags); 735615c164dSAlexander Shishkin 736615c164dSAlexander Shishkin if (ret) { 737615c164dSAlexander Shishkin if (expect == WIN_READY && old == WIN_LOCKED) 738615c164dSAlexander Shishkin return -EBUSY; 739615c164dSAlexander Shishkin 740615c164dSAlexander Shishkin /* from intel_th_msc_window_unlock(), don't warn if not locked */ 741615c164dSAlexander Shishkin if (expect == WIN_LOCKED && old == new) 742615c164dSAlexander Shishkin return 0; 743885f1235SAlexander Shishkin 744885f1235SAlexander Shishkin dev_warn_ratelimited(msc_dev(win->msc), 745885f1235SAlexander Shishkin "expected lockout state %d, got %d\n", 746885f1235SAlexander Shishkin expect, old); 747615c164dSAlexander Shishkin } 748615c164dSAlexander Shishkin 749615c164dSAlexander Shishkin return ret; 750615c164dSAlexander Shishkin } 751ba82664cSAlexander Shishkin /** 752ba82664cSAlexander Shishkin * msc_configure() - set up MSC hardware 753ba82664cSAlexander Shishkin * @msc: the MSC device to configure 754ba82664cSAlexander Shishkin * 755ba82664cSAlexander Shishkin * Program storage mode, wrapping, burst length and trace buffer address 756a45ff6edSAlexander Shishkin * into a given MSC. Then, enable tracing and set msc::enabled. 757a45ff6edSAlexander Shishkin * The latter is serialized on msc::buf_mutex, so make sure to hold it. 758ba82664cSAlexander Shishkin */ 759ba82664cSAlexander Shishkin static int msc_configure(struct msc *msc) 760ba82664cSAlexander Shishkin { 761ba82664cSAlexander Shishkin u32 reg; 762ba82664cSAlexander Shishkin 763a45ff6edSAlexander Shishkin lockdep_assert_held(&msc->buf_mutex); 764a45ff6edSAlexander Shishkin 765ba82664cSAlexander Shishkin if (msc->mode > MSC_MODE_MULTI) 766ce666be8SAlexander Shishkin return -EINVAL; 767ba82664cSAlexander Shishkin 768615c164dSAlexander Shishkin if (msc->mode == MSC_MODE_MULTI) { 769615c164dSAlexander Shishkin if (msc_win_set_lockout(msc->cur_win, WIN_READY, WIN_INUSE)) 770615c164dSAlexander Shishkin return -EBUSY; 771615c164dSAlexander Shishkin 772ba82664cSAlexander Shishkin msc_buffer_clear_hw_header(msc); 773615c164dSAlexander Shishkin } 774ba82664cSAlexander Shishkin 775092f47c3SAlexander Shishkin msc->orig_addr = ioread32(msc->reg_base + REG_MSU_MSC0BAR); 776092f47c3SAlexander Shishkin msc->orig_sz = ioread32(msc->reg_base + REG_MSU_MSC0SIZE); 777092f47c3SAlexander Shishkin 778ba82664cSAlexander Shishkin reg = msc->base_addr >> PAGE_SHIFT; 779ba82664cSAlexander Shishkin iowrite32(reg, msc->reg_base + REG_MSU_MSC0BAR); 780ba82664cSAlexander Shishkin 781ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) { 782ba82664cSAlexander Shishkin reg = msc->nr_pages; 783ba82664cSAlexander Shishkin iowrite32(reg, msc->reg_base + REG_MSU_MSC0SIZE); 784ba82664cSAlexander Shishkin } 785ba82664cSAlexander Shishkin 786ba82664cSAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSC0CTL); 787ba82664cSAlexander Shishkin reg &= ~(MSC_MODE | MSC_WRAPEN | MSC_EN | MSC_RD_HDR_OVRD); 788ba82664cSAlexander Shishkin 789a45ff6edSAlexander Shishkin reg |= MSC_EN; 790ba82664cSAlexander Shishkin reg |= msc->mode << __ffs(MSC_MODE); 791ba82664cSAlexander Shishkin reg |= msc->burst_len << __ffs(MSC_LEN); 792a45ff6edSAlexander Shishkin 793ba82664cSAlexander Shishkin if (msc->wrap) 794ba82664cSAlexander Shishkin reg |= MSC_WRAPEN; 795ba82664cSAlexander Shishkin 796ba82664cSAlexander Shishkin iowrite32(reg, msc->reg_base + REG_MSU_MSC0CTL); 797ba82664cSAlexander Shishkin 798615c164dSAlexander Shishkin intel_th_msu_init(msc); 799615c164dSAlexander Shishkin 800ba82664cSAlexander Shishkin msc->thdev->output.multiblock = msc->mode == MSC_MODE_MULTI; 801ba82664cSAlexander Shishkin intel_th_trace_enable(msc->thdev); 802a45ff6edSAlexander Shishkin msc->enabled = 1; 803a45ff6edSAlexander Shishkin 804615c164dSAlexander Shishkin if (msc->mbuf && msc->mbuf->activate) 805615c164dSAlexander Shishkin msc->mbuf->activate(msc->mbuf_priv); 806ba82664cSAlexander Shishkin 807ba82664cSAlexander Shishkin return 0; 808ba82664cSAlexander Shishkin } 809ba82664cSAlexander Shishkin 810ba82664cSAlexander Shishkin /** 811ba82664cSAlexander Shishkin * msc_disable() - disable MSC hardware 812ba82664cSAlexander Shishkin * @msc: MSC device to disable 813ba82664cSAlexander Shishkin * 814ba82664cSAlexander Shishkin * If @msc is enabled, disable tracing on the switch and then disable MSC 815a45ff6edSAlexander Shishkin * storage. Caller must hold msc::buf_mutex. 816ba82664cSAlexander Shishkin */ 817ba82664cSAlexander Shishkin static void msc_disable(struct msc *msc) 818ba82664cSAlexander Shishkin { 819615c164dSAlexander Shishkin struct msc_window *win = msc->cur_win; 820ba82664cSAlexander Shishkin u32 reg; 821ba82664cSAlexander Shishkin 822a45ff6edSAlexander Shishkin lockdep_assert_held(&msc->buf_mutex); 823ba82664cSAlexander Shishkin 824615c164dSAlexander Shishkin if (msc->mode == MSC_MODE_MULTI) 825615c164dSAlexander Shishkin msc_win_set_lockout(win, WIN_INUSE, WIN_LOCKED); 826615c164dSAlexander Shishkin 827615c164dSAlexander Shishkin if (msc->mbuf && msc->mbuf->deactivate) 828615c164dSAlexander Shishkin msc->mbuf->deactivate(msc->mbuf_priv); 829615c164dSAlexander Shishkin intel_th_msu_deinit(msc); 830ba82664cSAlexander Shishkin intel_th_trace_disable(msc->thdev); 831ba82664cSAlexander Shishkin 832ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) { 8338d415512SAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSC0STS); 834ba82664cSAlexander Shishkin msc->single_wrap = !!(reg & MSCSTS_WRAPSTAT); 835ba82664cSAlexander Shishkin 836ba82664cSAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSC0MWP); 837ba82664cSAlexander Shishkin msc->single_sz = reg & ((msc->nr_pages << PAGE_SHIFT) - 1); 838ba82664cSAlexander Shishkin dev_dbg(msc_dev(msc), "MSCnMWP: %08x/%08lx, wrap: %d\n", 839ba82664cSAlexander Shishkin reg, msc->single_sz, msc->single_wrap); 840ba82664cSAlexander Shishkin } 841ba82664cSAlexander Shishkin 842ba82664cSAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSC0CTL); 843ba82664cSAlexander Shishkin reg &= ~MSC_EN; 844ba82664cSAlexander Shishkin iowrite32(reg, msc->reg_base + REG_MSU_MSC0CTL); 845615c164dSAlexander Shishkin 846615c164dSAlexander Shishkin if (msc->mbuf && msc->mbuf->ready) 847615c164dSAlexander Shishkin msc->mbuf->ready(msc->mbuf_priv, win->sgt, 848615c164dSAlexander Shishkin msc_win_total_sz(win)); 849615c164dSAlexander Shishkin 850ba82664cSAlexander Shishkin msc->enabled = 0; 851ba82664cSAlexander Shishkin 852092f47c3SAlexander Shishkin iowrite32(msc->orig_addr, msc->reg_base + REG_MSU_MSC0BAR); 853092f47c3SAlexander Shishkin iowrite32(msc->orig_sz, msc->reg_base + REG_MSU_MSC0SIZE); 854ba82664cSAlexander Shishkin 855ba82664cSAlexander Shishkin dev_dbg(msc_dev(msc), "MSCnNWSA: %08x\n", 856ba82664cSAlexander Shishkin ioread32(msc->reg_base + REG_MSU_MSC0NWSA)); 857ba82664cSAlexander Shishkin 858ba82664cSAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSC0STS); 859ba82664cSAlexander Shishkin dev_dbg(msc_dev(msc), "MSCnSTS: %08x\n", reg); 860615c164dSAlexander Shishkin 861615c164dSAlexander Shishkin reg = ioread32(msc->reg_base + REG_MSU_MSUSTS); 862615c164dSAlexander Shishkin reg &= msc->index ? MSUSTS_MSC1BLAST : MSUSTS_MSC0BLAST; 863615c164dSAlexander Shishkin iowrite32(reg, msc->reg_base + REG_MSU_MSUSTS); 864ba82664cSAlexander Shishkin } 865ba82664cSAlexander Shishkin 866ba82664cSAlexander Shishkin static int intel_th_msc_activate(struct intel_th_device *thdev) 867ba82664cSAlexander Shishkin { 868ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 869a45ff6edSAlexander Shishkin int ret = -EBUSY; 870ba82664cSAlexander Shishkin 871ba82664cSAlexander Shishkin if (!atomic_inc_unless_negative(&msc->user_count)) 872ba82664cSAlexander Shishkin return -ENODEV; 873ba82664cSAlexander Shishkin 874a45ff6edSAlexander Shishkin mutex_lock(&msc->buf_mutex); 875ba82664cSAlexander Shishkin 876a45ff6edSAlexander Shishkin /* if there are readers, refuse */ 877a45ff6edSAlexander Shishkin if (list_empty(&msc->iter_list)) 878a45ff6edSAlexander Shishkin ret = msc_configure(msc); 879a45ff6edSAlexander Shishkin 880a45ff6edSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 881a45ff6edSAlexander Shishkin 882a45ff6edSAlexander Shishkin if (ret) 883ba82664cSAlexander Shishkin atomic_dec(&msc->user_count); 884a45ff6edSAlexander Shishkin 885ba82664cSAlexander Shishkin return ret; 886ba82664cSAlexander Shishkin } 887ba82664cSAlexander Shishkin 888ba82664cSAlexander Shishkin static void intel_th_msc_deactivate(struct intel_th_device *thdev) 889ba82664cSAlexander Shishkin { 890ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 891ba82664cSAlexander Shishkin 892a45ff6edSAlexander Shishkin mutex_lock(&msc->buf_mutex); 893a45ff6edSAlexander Shishkin if (msc->enabled) { 894ba82664cSAlexander Shishkin msc_disable(msc); 895ba82664cSAlexander Shishkin atomic_dec(&msc->user_count); 896ba82664cSAlexander Shishkin } 897a45ff6edSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 898a45ff6edSAlexander Shishkin } 899ba82664cSAlexander Shishkin 900ba82664cSAlexander Shishkin /** 901ba82664cSAlexander Shishkin * msc_buffer_contig_alloc() - allocate a contiguous buffer for SINGLE mode 902ba82664cSAlexander Shishkin * @msc: MSC device 903ba82664cSAlexander Shishkin * @size: allocation size in bytes 904ba82664cSAlexander Shishkin * 905ba82664cSAlexander Shishkin * This modifies msc::base, which requires msc::buf_mutex to serialize, so the 906ba82664cSAlexander Shishkin * caller is expected to hold it. 907ba82664cSAlexander Shishkin * 908ba82664cSAlexander Shishkin * Return: 0 on success, -errno otherwise. 909ba82664cSAlexander Shishkin */ 910ba82664cSAlexander Shishkin static int msc_buffer_contig_alloc(struct msc *msc, unsigned long size) 911ba82664cSAlexander Shishkin { 9124e0eaf23SAlexander Shishkin unsigned long nr_pages = size >> PAGE_SHIFT; 913ba82664cSAlexander Shishkin unsigned int order = get_order(size); 914ba82664cSAlexander Shishkin struct page *page; 9154e0eaf23SAlexander Shishkin int ret; 916ba82664cSAlexander Shishkin 917ba82664cSAlexander Shishkin if (!size) 918ba82664cSAlexander Shishkin return 0; 919ba82664cSAlexander Shishkin 9204e0eaf23SAlexander Shishkin ret = sg_alloc_table(&msc->single_sgt, 1, GFP_KERNEL); 9214e0eaf23SAlexander Shishkin if (ret) 9224e0eaf23SAlexander Shishkin goto err_out; 9234e0eaf23SAlexander Shishkin 9244e0eaf23SAlexander Shishkin ret = -ENOMEM; 925918b8646SAlexander Shishkin page = alloc_pages(GFP_KERNEL | __GFP_ZERO | GFP_DMA32, order); 926ba82664cSAlexander Shishkin if (!page) 9274e0eaf23SAlexander Shishkin goto err_free_sgt; 928ba82664cSAlexander Shishkin 929ba82664cSAlexander Shishkin split_page(page, order); 9304e0eaf23SAlexander Shishkin sg_set_buf(msc->single_sgt.sgl, page_address(page), size); 9314e0eaf23SAlexander Shishkin 9324e0eaf23SAlexander Shishkin ret = dma_map_sg(msc_dev(msc)->parent->parent, msc->single_sgt.sgl, 1, 9334e0eaf23SAlexander Shishkin DMA_FROM_DEVICE); 9344e0eaf23SAlexander Shishkin if (ret < 0) 9354e0eaf23SAlexander Shishkin goto err_free_pages; 9364e0eaf23SAlexander Shishkin 9374e0eaf23SAlexander Shishkin msc->nr_pages = nr_pages; 938ba82664cSAlexander Shishkin msc->base = page_address(page); 9394e0eaf23SAlexander Shishkin msc->base_addr = sg_dma_address(msc->single_sgt.sgl); 940ba82664cSAlexander Shishkin 941ba82664cSAlexander Shishkin return 0; 9424e0eaf23SAlexander Shishkin 9434e0eaf23SAlexander Shishkin err_free_pages: 9444e0eaf23SAlexander Shishkin __free_pages(page, order); 9454e0eaf23SAlexander Shishkin 9464e0eaf23SAlexander Shishkin err_free_sgt: 9474e0eaf23SAlexander Shishkin sg_free_table(&msc->single_sgt); 9484e0eaf23SAlexander Shishkin 9494e0eaf23SAlexander Shishkin err_out: 9504e0eaf23SAlexander Shishkin return ret; 951ba82664cSAlexander Shishkin } 952ba82664cSAlexander Shishkin 953ba82664cSAlexander Shishkin /** 954ba82664cSAlexander Shishkin * msc_buffer_contig_free() - free a contiguous buffer 955ba82664cSAlexander Shishkin * @msc: MSC configured in SINGLE mode 956ba82664cSAlexander Shishkin */ 957ba82664cSAlexander Shishkin static void msc_buffer_contig_free(struct msc *msc) 958ba82664cSAlexander Shishkin { 959ba82664cSAlexander Shishkin unsigned long off; 960ba82664cSAlexander Shishkin 9614e0eaf23SAlexander Shishkin dma_unmap_sg(msc_dev(msc)->parent->parent, msc->single_sgt.sgl, 9624e0eaf23SAlexander Shishkin 1, DMA_FROM_DEVICE); 9634e0eaf23SAlexander Shishkin sg_free_table(&msc->single_sgt); 9644e0eaf23SAlexander Shishkin 965ba82664cSAlexander Shishkin for (off = 0; off < msc->nr_pages << PAGE_SHIFT; off += PAGE_SIZE) { 966ba82664cSAlexander Shishkin struct page *page = virt_to_page(msc->base + off); 967ba82664cSAlexander Shishkin 968ba82664cSAlexander Shishkin page->mapping = NULL; 969ba82664cSAlexander Shishkin __free_page(page); 970ba82664cSAlexander Shishkin } 971ba82664cSAlexander Shishkin 972ba82664cSAlexander Shishkin msc->nr_pages = 0; 973ba82664cSAlexander Shishkin } 974ba82664cSAlexander Shishkin 975ba82664cSAlexander Shishkin /** 976ba82664cSAlexander Shishkin * msc_buffer_contig_get_page() - find a page at a given offset 977ba82664cSAlexander Shishkin * @msc: MSC configured in SINGLE mode 978ba82664cSAlexander Shishkin * @pgoff: page offset 979ba82664cSAlexander Shishkin * 980ba82664cSAlexander Shishkin * Return: page, if @pgoff is within the range, NULL otherwise. 981ba82664cSAlexander Shishkin */ 982ba82664cSAlexander Shishkin static struct page *msc_buffer_contig_get_page(struct msc *msc, 983ba82664cSAlexander Shishkin unsigned long pgoff) 984ba82664cSAlexander Shishkin { 985ba82664cSAlexander Shishkin if (pgoff >= msc->nr_pages) 986ba82664cSAlexander Shishkin return NULL; 987ba82664cSAlexander Shishkin 988ba82664cSAlexander Shishkin return virt_to_page(msc->base + (pgoff << PAGE_SHIFT)); 989ba82664cSAlexander Shishkin } 990ba82664cSAlexander Shishkin 991ba39bd83SAlexander Shishkin static int __msc_buffer_win_alloc(struct msc_window *win, 992fa52b3feSAlexander Shishkin unsigned int nr_segs) 993ba39bd83SAlexander Shishkin { 994ba39bd83SAlexander Shishkin struct scatterlist *sg_ptr; 995ba39bd83SAlexander Shishkin void *block; 996ba39bd83SAlexander Shishkin int i, ret; 997ba39bd83SAlexander Shishkin 998bbbc08a1SAlexander Shishkin ret = sg_alloc_table(win->sgt, nr_segs, GFP_KERNEL); 999ba39bd83SAlexander Shishkin if (ret) 1000ba39bd83SAlexander Shishkin return -ENOMEM; 1001ba39bd83SAlexander Shishkin 1002bbbc08a1SAlexander Shishkin for_each_sg(win->sgt->sgl, sg_ptr, nr_segs, i) { 1003ba39bd83SAlexander Shishkin block = dma_alloc_coherent(msc_dev(win->msc)->parent->parent, 1004ba39bd83SAlexander Shishkin PAGE_SIZE, &sg_dma_address(sg_ptr), 1005ba39bd83SAlexander Shishkin GFP_KERNEL); 1006ba39bd83SAlexander Shishkin if (!block) 1007ba39bd83SAlexander Shishkin goto err_nomem; 1008ba39bd83SAlexander Shishkin 1009ba39bd83SAlexander Shishkin sg_set_buf(sg_ptr, block, PAGE_SIZE); 1010ba39bd83SAlexander Shishkin } 1011ba39bd83SAlexander Shishkin 1012fa52b3feSAlexander Shishkin return nr_segs; 1013ba39bd83SAlexander Shishkin 1014ba39bd83SAlexander Shishkin err_nomem: 101557b69a1fSAlexander Shishkin for_each_sg(win->sgt->sgl, sg_ptr, i, ret) 1016ba39bd83SAlexander Shishkin dma_free_coherent(msc_dev(win->msc)->parent->parent, PAGE_SIZE, 101757b69a1fSAlexander Shishkin sg_virt(sg_ptr), sg_dma_address(sg_ptr)); 1018ba39bd83SAlexander Shishkin 1019bbbc08a1SAlexander Shishkin sg_free_table(win->sgt); 1020ba39bd83SAlexander Shishkin 1021ba39bd83SAlexander Shishkin return -ENOMEM; 1022ba39bd83SAlexander Shishkin } 1023ba39bd83SAlexander Shishkin 1024b96fb368SShaokun Zhang #ifdef CONFIG_X86 102502ca71efSAlexander Shishkin static void msc_buffer_set_uc(struct msc *msc) 1026b96fb368SShaokun Zhang { 102757b69a1fSAlexander Shishkin struct scatterlist *sg_ptr; 102802ca71efSAlexander Shishkin struct msc_window *win; 1029b96fb368SShaokun Zhang int i; 1030b96fb368SShaokun Zhang 103102ca71efSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) { 103202ca71efSAlexander Shishkin set_memory_uc((unsigned long)msc->base, msc->nr_pages); 103302ca71efSAlexander Shishkin return; 103402ca71efSAlexander Shishkin } 103502ca71efSAlexander Shishkin 103602ca71efSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) { 103702ca71efSAlexander Shishkin for_each_sg(win->sgt->sgl, sg_ptr, win->nr_segs, i) { 1038b96fb368SShaokun Zhang /* Set the page as uncached */ 103957b69a1fSAlexander Shishkin set_memory_uc((unsigned long)sg_virt(sg_ptr), 104057b69a1fSAlexander Shishkin PFN_DOWN(sg_ptr->length)); 104157b69a1fSAlexander Shishkin } 1042b96fb368SShaokun Zhang } 104302ca71efSAlexander Shishkin } 1044b96fb368SShaokun Zhang 104502ca71efSAlexander Shishkin static void msc_buffer_set_wb(struct msc *msc) 1046b96fb368SShaokun Zhang { 104757b69a1fSAlexander Shishkin struct scatterlist *sg_ptr; 104802ca71efSAlexander Shishkin struct msc_window *win; 1049b96fb368SShaokun Zhang int i; 1050b96fb368SShaokun Zhang 105102ca71efSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) { 105202ca71efSAlexander Shishkin set_memory_wb((unsigned long)msc->base, msc->nr_pages); 105302ca71efSAlexander Shishkin return; 105402ca71efSAlexander Shishkin } 105502ca71efSAlexander Shishkin 105602ca71efSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) { 105757b69a1fSAlexander Shishkin for_each_sg(win->sgt->sgl, sg_ptr, win->nr_segs, i) { 1058b96fb368SShaokun Zhang /* Reset the page to write-back */ 105957b69a1fSAlexander Shishkin set_memory_wb((unsigned long)sg_virt(sg_ptr), 106057b69a1fSAlexander Shishkin PFN_DOWN(sg_ptr->length)); 106157b69a1fSAlexander Shishkin } 1062b96fb368SShaokun Zhang } 106302ca71efSAlexander Shishkin } 1064b96fb368SShaokun Zhang #else /* !X86 */ 1065b96fb368SShaokun Zhang static inline void 106602ca71efSAlexander Shishkin msc_buffer_set_uc(struct msc *msc) {} 106702ca71efSAlexander Shishkin static inline void msc_buffer_set_wb(struct msc *msc) {} 1068b96fb368SShaokun Zhang #endif /* CONFIG_X86 */ 1069b96fb368SShaokun Zhang 1070*ac12ad3cSAlexander Shishkin static struct page *msc_sg_page(struct scatterlist *sg) 1071*ac12ad3cSAlexander Shishkin { 1072*ac12ad3cSAlexander Shishkin void *addr = sg_virt(sg); 1073*ac12ad3cSAlexander Shishkin 1074*ac12ad3cSAlexander Shishkin if (is_vmalloc_addr(addr)) 1075*ac12ad3cSAlexander Shishkin return vmalloc_to_page(addr); 1076*ac12ad3cSAlexander Shishkin 1077*ac12ad3cSAlexander Shishkin return sg_page(sg); 1078*ac12ad3cSAlexander Shishkin } 1079*ac12ad3cSAlexander Shishkin 1080ba82664cSAlexander Shishkin /** 1081ba82664cSAlexander Shishkin * msc_buffer_win_alloc() - alloc a window for a multiblock mode 1082ba82664cSAlexander Shishkin * @msc: MSC device 1083ba82664cSAlexander Shishkin * @nr_blocks: number of pages in this window 1084ba82664cSAlexander Shishkin * 1085ba82664cSAlexander Shishkin * This modifies msc::win_list and msc::base, which requires msc::buf_mutex 1086ba82664cSAlexander Shishkin * to serialize, so the caller is expected to hold it. 1087ba82664cSAlexander Shishkin * 1088ba82664cSAlexander Shishkin * Return: 0 on success, -errno otherwise. 1089ba82664cSAlexander Shishkin */ 1090ba82664cSAlexander Shishkin static int msc_buffer_win_alloc(struct msc *msc, unsigned int nr_blocks) 1091ba82664cSAlexander Shishkin { 1092ba82664cSAlexander Shishkin struct msc_window *win; 1093b96fb368SShaokun Zhang int ret = -ENOMEM; 1094ba82664cSAlexander Shishkin 1095ba82664cSAlexander Shishkin if (!nr_blocks) 1096ba82664cSAlexander Shishkin return 0; 1097ba82664cSAlexander Shishkin 1098ba39bd83SAlexander Shishkin win = kzalloc(sizeof(*win), GFP_KERNEL); 1099ba82664cSAlexander Shishkin if (!win) 1100ba82664cSAlexander Shishkin return -ENOMEM; 1101ba82664cSAlexander Shishkin 1102ba39bd83SAlexander Shishkin win->msc = msc; 1103bbbc08a1SAlexander Shishkin win->sgt = &win->_sgt; 1104615c164dSAlexander Shishkin win->lockout = WIN_READY; 1105615c164dSAlexander Shishkin spin_lock_init(&win->lo_lock); 1106ba39bd83SAlexander Shishkin 1107ba82664cSAlexander Shishkin if (!list_empty(&msc->win_list)) { 11080de9e035SAlexander Shishkin struct msc_window *prev = list_last_entry(&msc->win_list, 11090de9e035SAlexander Shishkin struct msc_window, 11100de9e035SAlexander Shishkin entry); 1111ba82664cSAlexander Shishkin 1112ba82664cSAlexander Shishkin win->pgoff = prev->pgoff + prev->nr_blocks; 1113ba82664cSAlexander Shishkin } 1114ba82664cSAlexander Shishkin 1115615c164dSAlexander Shishkin if (msc->mbuf && msc->mbuf->alloc_window) 1116615c164dSAlexander Shishkin ret = msc->mbuf->alloc_window(msc->mbuf_priv, &win->sgt, 1117615c164dSAlexander Shishkin nr_blocks << PAGE_SHIFT); 1118615c164dSAlexander Shishkin else 1119ba39bd83SAlexander Shishkin ret = __msc_buffer_win_alloc(win, nr_blocks); 1120615c164dSAlexander Shishkin 1121615c164dSAlexander Shishkin if (ret <= 0) 1122d5c435dfSAlexander Shishkin goto err_nomem; 1123ba82664cSAlexander Shishkin 1124fa52b3feSAlexander Shishkin win->nr_segs = ret; 1125fa52b3feSAlexander Shishkin win->nr_blocks = nr_blocks; 1126ba82664cSAlexander Shishkin 1127ba82664cSAlexander Shishkin if (list_empty(&msc->win_list)) { 112857b69a1fSAlexander Shishkin msc->base = msc_win_base(win); 112957b69a1fSAlexander Shishkin msc->base_addr = msc_win_base_dma(win); 1130aad14ad3SAlexander Shishkin msc->cur_win = win; 1131ba82664cSAlexander Shishkin } 1132ba82664cSAlexander Shishkin 1133ba82664cSAlexander Shishkin list_add_tail(&win->entry, &msc->win_list); 1134ba82664cSAlexander Shishkin msc->nr_pages += nr_blocks; 1135ba82664cSAlexander Shishkin 1136ba82664cSAlexander Shishkin return 0; 1137ba82664cSAlexander Shishkin 1138ba82664cSAlexander Shishkin err_nomem: 1139ba82664cSAlexander Shishkin kfree(win); 1140ba82664cSAlexander Shishkin 1141ba82664cSAlexander Shishkin return ret; 1142ba82664cSAlexander Shishkin } 1143ba82664cSAlexander Shishkin 1144ba39bd83SAlexander Shishkin static void __msc_buffer_win_free(struct msc *msc, struct msc_window *win) 1145ba39bd83SAlexander Shishkin { 114657b69a1fSAlexander Shishkin struct scatterlist *sg; 1147ba39bd83SAlexander Shishkin int i; 1148ba39bd83SAlexander Shishkin 114957b69a1fSAlexander Shishkin for_each_sg(win->sgt->sgl, sg, win->nr_segs, i) { 1150*ac12ad3cSAlexander Shishkin struct page *page = msc_sg_page(sg); 1151ba39bd83SAlexander Shishkin 1152ba39bd83SAlexander Shishkin page->mapping = NULL; 1153ba39bd83SAlexander Shishkin dma_free_coherent(msc_dev(win->msc)->parent->parent, PAGE_SIZE, 115457b69a1fSAlexander Shishkin sg_virt(sg), sg_dma_address(sg)); 1155ba39bd83SAlexander Shishkin } 1156bbbc08a1SAlexander Shishkin sg_free_table(win->sgt); 1157ba39bd83SAlexander Shishkin } 1158ba39bd83SAlexander Shishkin 1159ba82664cSAlexander Shishkin /** 1160ba82664cSAlexander Shishkin * msc_buffer_win_free() - free a window from MSC's window list 1161ba82664cSAlexander Shishkin * @msc: MSC device 1162ba82664cSAlexander Shishkin * @win: window to free 1163ba82664cSAlexander Shishkin * 1164ba82664cSAlexander Shishkin * This modifies msc::win_list and msc::base, which requires msc::buf_mutex 1165ba82664cSAlexander Shishkin * to serialize, so the caller is expected to hold it. 1166ba82664cSAlexander Shishkin */ 1167ba82664cSAlexander Shishkin static void msc_buffer_win_free(struct msc *msc, struct msc_window *win) 1168ba82664cSAlexander Shishkin { 1169ba82664cSAlexander Shishkin msc->nr_pages -= win->nr_blocks; 1170ba82664cSAlexander Shishkin 1171ba82664cSAlexander Shishkin list_del(&win->entry); 1172ba82664cSAlexander Shishkin if (list_empty(&msc->win_list)) { 1173ba82664cSAlexander Shishkin msc->base = NULL; 1174ba82664cSAlexander Shishkin msc->base_addr = 0; 1175ba82664cSAlexander Shishkin } 1176ba82664cSAlexander Shishkin 1177615c164dSAlexander Shishkin if (msc->mbuf && msc->mbuf->free_window) 1178615c164dSAlexander Shishkin msc->mbuf->free_window(msc->mbuf_priv, win->sgt); 1179615c164dSAlexander Shishkin else 1180ba39bd83SAlexander Shishkin __msc_buffer_win_free(msc, win); 1181ba82664cSAlexander Shishkin 1182ba82664cSAlexander Shishkin kfree(win); 1183ba82664cSAlexander Shishkin } 1184ba82664cSAlexander Shishkin 1185ba82664cSAlexander Shishkin /** 1186ba82664cSAlexander Shishkin * msc_buffer_relink() - set up block descriptors for multiblock mode 1187ba82664cSAlexander Shishkin * @msc: MSC device 1188ba82664cSAlexander Shishkin * 1189ba82664cSAlexander Shishkin * This traverses msc::win_list, which requires msc::buf_mutex to serialize, 1190ba82664cSAlexander Shishkin * so the caller is expected to hold it. 1191ba82664cSAlexander Shishkin */ 1192ba82664cSAlexander Shishkin static void msc_buffer_relink(struct msc *msc) 1193ba82664cSAlexander Shishkin { 1194ba82664cSAlexander Shishkin struct msc_window *win, *next_win; 1195ba82664cSAlexander Shishkin 1196ba82664cSAlexander Shishkin /* call with msc::mutex locked */ 1197ba82664cSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) { 119857b69a1fSAlexander Shishkin struct scatterlist *sg; 1199ba82664cSAlexander Shishkin unsigned int blk; 1200ba82664cSAlexander Shishkin u32 sw_tag = 0; 1201ba82664cSAlexander Shishkin 1202ba82664cSAlexander Shishkin /* 1203ba82664cSAlexander Shishkin * Last window's next_win should point to the first window 1204ba82664cSAlexander Shishkin * and MSC_SW_TAG_LASTWIN should be set. 1205ba82664cSAlexander Shishkin */ 1206ba82664cSAlexander Shishkin if (msc_is_last_win(win)) { 1207ba82664cSAlexander Shishkin sw_tag |= MSC_SW_TAG_LASTWIN; 12080de9e035SAlexander Shishkin next_win = list_first_entry(&msc->win_list, 1209ba82664cSAlexander Shishkin struct msc_window, entry); 1210ba82664cSAlexander Shishkin } else { 12110de9e035SAlexander Shishkin next_win = list_next_entry(win, entry); 1212ba82664cSAlexander Shishkin } 1213ba82664cSAlexander Shishkin 121457b69a1fSAlexander Shishkin for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) { 121557b69a1fSAlexander Shishkin struct msc_block_desc *bdesc = sg_virt(sg); 1216ba82664cSAlexander Shishkin 1217ba82664cSAlexander Shishkin memset(bdesc, 0, sizeof(*bdesc)); 1218ba82664cSAlexander Shishkin 121957b69a1fSAlexander Shishkin bdesc->next_win = msc_win_base_pfn(next_win); 1220ba82664cSAlexander Shishkin 1221ba82664cSAlexander Shishkin /* 1222ba82664cSAlexander Shishkin * Similarly to last window, last block should point 1223ba82664cSAlexander Shishkin * to the first one. 1224ba82664cSAlexander Shishkin */ 1225fa52b3feSAlexander Shishkin if (blk == win->nr_segs - 1) { 1226ba82664cSAlexander Shishkin sw_tag |= MSC_SW_TAG_LASTBLK; 122757b69a1fSAlexander Shishkin bdesc->next_blk = msc_win_base_pfn(win); 1228ba82664cSAlexander Shishkin } else { 122957b69a1fSAlexander Shishkin dma_addr_t addr = sg_dma_address(sg_next(sg)); 123057b69a1fSAlexander Shishkin 123157b69a1fSAlexander Shishkin bdesc->next_blk = PFN_DOWN(addr); 1232ba82664cSAlexander Shishkin } 1233ba82664cSAlexander Shishkin 1234ba82664cSAlexander Shishkin bdesc->sw_tag = sw_tag; 123557b69a1fSAlexander Shishkin bdesc->block_sz = sg->length / 64; 1236ba82664cSAlexander Shishkin } 1237ba82664cSAlexander Shishkin } 1238ba82664cSAlexander Shishkin 1239ba82664cSAlexander Shishkin /* 1240ba82664cSAlexander Shishkin * Make the above writes globally visible before tracing is 1241ba82664cSAlexander Shishkin * enabled to make sure hardware sees them coherently. 1242ba82664cSAlexander Shishkin */ 1243ba82664cSAlexander Shishkin wmb(); 1244ba82664cSAlexander Shishkin } 1245ba82664cSAlexander Shishkin 1246ba82664cSAlexander Shishkin static void msc_buffer_multi_free(struct msc *msc) 1247ba82664cSAlexander Shishkin { 1248ba82664cSAlexander Shishkin struct msc_window *win, *iter; 1249ba82664cSAlexander Shishkin 1250ba82664cSAlexander Shishkin list_for_each_entry_safe(win, iter, &msc->win_list, entry) 1251ba82664cSAlexander Shishkin msc_buffer_win_free(msc, win); 1252ba82664cSAlexander Shishkin } 1253ba82664cSAlexander Shishkin 1254ba82664cSAlexander Shishkin static int msc_buffer_multi_alloc(struct msc *msc, unsigned long *nr_pages, 1255ba82664cSAlexander Shishkin unsigned int nr_wins) 1256ba82664cSAlexander Shishkin { 1257ba82664cSAlexander Shishkin int ret, i; 1258ba82664cSAlexander Shishkin 1259ba82664cSAlexander Shishkin for (i = 0; i < nr_wins; i++) { 1260ba82664cSAlexander Shishkin ret = msc_buffer_win_alloc(msc, nr_pages[i]); 1261ba82664cSAlexander Shishkin if (ret) { 1262ba82664cSAlexander Shishkin msc_buffer_multi_free(msc); 1263ba82664cSAlexander Shishkin return ret; 1264ba82664cSAlexander Shishkin } 1265ba82664cSAlexander Shishkin } 1266ba82664cSAlexander Shishkin 1267ba82664cSAlexander Shishkin msc_buffer_relink(msc); 1268ba82664cSAlexander Shishkin 1269ba82664cSAlexander Shishkin return 0; 1270ba82664cSAlexander Shishkin } 1271ba82664cSAlexander Shishkin 1272ba82664cSAlexander Shishkin /** 1273ba82664cSAlexander Shishkin * msc_buffer_free() - free buffers for MSC 1274ba82664cSAlexander Shishkin * @msc: MSC device 1275ba82664cSAlexander Shishkin * 1276ba82664cSAlexander Shishkin * Free MSC's storage buffers. 1277ba82664cSAlexander Shishkin * 1278ba82664cSAlexander Shishkin * This modifies msc::win_list and msc::base, which requires msc::buf_mutex to 1279ba82664cSAlexander Shishkin * serialize, so the caller is expected to hold it. 1280ba82664cSAlexander Shishkin */ 1281ba82664cSAlexander Shishkin static void msc_buffer_free(struct msc *msc) 1282ba82664cSAlexander Shishkin { 128302ca71efSAlexander Shishkin msc_buffer_set_wb(msc); 128402ca71efSAlexander Shishkin 1285ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) 1286ba82664cSAlexander Shishkin msc_buffer_contig_free(msc); 1287ba82664cSAlexander Shishkin else if (msc->mode == MSC_MODE_MULTI) 1288ba82664cSAlexander Shishkin msc_buffer_multi_free(msc); 1289ba82664cSAlexander Shishkin } 1290ba82664cSAlexander Shishkin 1291ba82664cSAlexander Shishkin /** 1292ba82664cSAlexander Shishkin * msc_buffer_alloc() - allocate a buffer for MSC 1293ba82664cSAlexander Shishkin * @msc: MSC device 1294ba82664cSAlexander Shishkin * @size: allocation size in bytes 1295ba82664cSAlexander Shishkin * 1296ba82664cSAlexander Shishkin * Allocate a storage buffer for MSC, depending on the msc::mode, it will be 1297ba82664cSAlexander Shishkin * either done via msc_buffer_contig_alloc() for SINGLE operation mode or 1298ba82664cSAlexander Shishkin * msc_buffer_win_alloc() for multiblock operation. The latter allocates one 1299ba82664cSAlexander Shishkin * window per invocation, so in multiblock mode this can be called multiple 1300ba82664cSAlexander Shishkin * times for the same MSC to allocate multiple windows. 1301ba82664cSAlexander Shishkin * 1302ba82664cSAlexander Shishkin * This modifies msc::win_list and msc::base, which requires msc::buf_mutex 1303ba82664cSAlexander Shishkin * to serialize, so the caller is expected to hold it. 1304ba82664cSAlexander Shishkin * 1305ba82664cSAlexander Shishkin * Return: 0 on success, -errno otherwise. 1306ba82664cSAlexander Shishkin */ 1307ba82664cSAlexander Shishkin static int msc_buffer_alloc(struct msc *msc, unsigned long *nr_pages, 1308ba82664cSAlexander Shishkin unsigned int nr_wins) 1309ba82664cSAlexander Shishkin { 1310ba82664cSAlexander Shishkin int ret; 1311ba82664cSAlexander Shishkin 1312ba82664cSAlexander Shishkin /* -1: buffer not allocated */ 1313ba82664cSAlexander Shishkin if (atomic_read(&msc->user_count) != -1) 1314ba82664cSAlexander Shishkin return -EBUSY; 1315ba82664cSAlexander Shishkin 1316ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) { 1317ba82664cSAlexander Shishkin if (nr_wins != 1) 1318ba82664cSAlexander Shishkin return -EINVAL; 1319ba82664cSAlexander Shishkin 1320ba82664cSAlexander Shishkin ret = msc_buffer_contig_alloc(msc, nr_pages[0] << PAGE_SHIFT); 1321ba82664cSAlexander Shishkin } else if (msc->mode == MSC_MODE_MULTI) { 1322ba82664cSAlexander Shishkin ret = msc_buffer_multi_alloc(msc, nr_pages, nr_wins); 1323ba82664cSAlexander Shishkin } else { 1324ce666be8SAlexander Shishkin ret = -EINVAL; 1325ba82664cSAlexander Shishkin } 1326ba82664cSAlexander Shishkin 1327ba82664cSAlexander Shishkin if (!ret) { 132802ca71efSAlexander Shishkin msc_buffer_set_uc(msc); 132902ca71efSAlexander Shishkin 1330ba82664cSAlexander Shishkin /* allocation should be visible before the counter goes to 0 */ 1331ba82664cSAlexander Shishkin smp_mb__before_atomic(); 1332ba82664cSAlexander Shishkin 1333ba82664cSAlexander Shishkin if (WARN_ON_ONCE(atomic_cmpxchg(&msc->user_count, -1, 0) != -1)) 1334ba82664cSAlexander Shishkin return -EINVAL; 1335ba82664cSAlexander Shishkin } 1336ba82664cSAlexander Shishkin 1337ba82664cSAlexander Shishkin return ret; 1338ba82664cSAlexander Shishkin } 1339ba82664cSAlexander Shishkin 1340ba82664cSAlexander Shishkin /** 1341ba82664cSAlexander Shishkin * msc_buffer_unlocked_free_unless_used() - free a buffer unless it's in use 1342ba82664cSAlexander Shishkin * @msc: MSC device 1343ba82664cSAlexander Shishkin * 1344ba82664cSAlexander Shishkin * This will free MSC buffer unless it is in use or there is no allocated 1345ba82664cSAlexander Shishkin * buffer. 1346ba82664cSAlexander Shishkin * Caller needs to hold msc::buf_mutex. 1347ba82664cSAlexander Shishkin * 1348ba82664cSAlexander Shishkin * Return: 0 on successful deallocation or if there was no buffer to 1349ba82664cSAlexander Shishkin * deallocate, -EBUSY if there are active users. 1350ba82664cSAlexander Shishkin */ 1351ba82664cSAlexander Shishkin static int msc_buffer_unlocked_free_unless_used(struct msc *msc) 1352ba82664cSAlexander Shishkin { 1353ba82664cSAlexander Shishkin int count, ret = 0; 1354ba82664cSAlexander Shishkin 1355ba82664cSAlexander Shishkin count = atomic_cmpxchg(&msc->user_count, 0, -1); 1356ba82664cSAlexander Shishkin 1357ba82664cSAlexander Shishkin /* > 0: buffer is allocated and has users */ 1358ba82664cSAlexander Shishkin if (count > 0) 1359ba82664cSAlexander Shishkin ret = -EBUSY; 1360ba82664cSAlexander Shishkin /* 0: buffer is allocated, no users */ 1361ba82664cSAlexander Shishkin else if (!count) 1362ba82664cSAlexander Shishkin msc_buffer_free(msc); 1363ba82664cSAlexander Shishkin /* < 0: no buffer, nothing to do */ 1364ba82664cSAlexander Shishkin 1365ba82664cSAlexander Shishkin return ret; 1366ba82664cSAlexander Shishkin } 1367ba82664cSAlexander Shishkin 1368ba82664cSAlexander Shishkin /** 1369ba82664cSAlexander Shishkin * msc_buffer_free_unless_used() - free a buffer unless it's in use 1370ba82664cSAlexander Shishkin * @msc: MSC device 1371ba82664cSAlexander Shishkin * 1372ba82664cSAlexander Shishkin * This is a locked version of msc_buffer_unlocked_free_unless_used(). 1373ba82664cSAlexander Shishkin */ 1374ba82664cSAlexander Shishkin static int msc_buffer_free_unless_used(struct msc *msc) 1375ba82664cSAlexander Shishkin { 1376ba82664cSAlexander Shishkin int ret; 1377ba82664cSAlexander Shishkin 1378ba82664cSAlexander Shishkin mutex_lock(&msc->buf_mutex); 1379ba82664cSAlexander Shishkin ret = msc_buffer_unlocked_free_unless_used(msc); 1380ba82664cSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 1381ba82664cSAlexander Shishkin 1382ba82664cSAlexander Shishkin return ret; 1383ba82664cSAlexander Shishkin } 1384ba82664cSAlexander Shishkin 1385ba82664cSAlexander Shishkin /** 1386ba82664cSAlexander Shishkin * msc_buffer_get_page() - get MSC buffer page at a given offset 1387ba82664cSAlexander Shishkin * @msc: MSC device 1388ba82664cSAlexander Shishkin * @pgoff: page offset into the storage buffer 1389ba82664cSAlexander Shishkin * 1390ba82664cSAlexander Shishkin * This traverses msc::win_list, so holding msc::buf_mutex is expected from 1391ba82664cSAlexander Shishkin * the caller. 1392ba82664cSAlexander Shishkin * 1393ba82664cSAlexander Shishkin * Return: page if @pgoff corresponds to a valid buffer page or NULL. 1394ba82664cSAlexander Shishkin */ 1395ba82664cSAlexander Shishkin static struct page *msc_buffer_get_page(struct msc *msc, unsigned long pgoff) 1396ba82664cSAlexander Shishkin { 1397ba82664cSAlexander Shishkin struct msc_window *win; 139857b69a1fSAlexander Shishkin struct scatterlist *sg; 1399fa52b3feSAlexander Shishkin unsigned int blk; 1400ba82664cSAlexander Shishkin 1401ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) 1402ba82664cSAlexander Shishkin return msc_buffer_contig_get_page(msc, pgoff); 1403ba82664cSAlexander Shishkin 1404ba82664cSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) 1405ba82664cSAlexander Shishkin if (pgoff >= win->pgoff && pgoff < win->pgoff + win->nr_blocks) 1406ba82664cSAlexander Shishkin goto found; 1407ba82664cSAlexander Shishkin 1408ba82664cSAlexander Shishkin return NULL; 1409ba82664cSAlexander Shishkin 1410ba82664cSAlexander Shishkin found: 1411ba82664cSAlexander Shishkin pgoff -= win->pgoff; 1412fa52b3feSAlexander Shishkin 141357b69a1fSAlexander Shishkin for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) { 1414*ac12ad3cSAlexander Shishkin struct page *page = msc_sg_page(sg); 141557b69a1fSAlexander Shishkin size_t pgsz = PFN_DOWN(sg->length); 1416fa52b3feSAlexander Shishkin 1417fa52b3feSAlexander Shishkin if (pgoff < pgsz) 1418fa52b3feSAlexander Shishkin return page + pgoff; 1419fa52b3feSAlexander Shishkin 1420fa52b3feSAlexander Shishkin pgoff -= pgsz; 1421fa52b3feSAlexander Shishkin } 1422fa52b3feSAlexander Shishkin 1423fa52b3feSAlexander Shishkin return NULL; 1424ba82664cSAlexander Shishkin } 1425ba82664cSAlexander Shishkin 1426ba82664cSAlexander Shishkin /** 1427ba82664cSAlexander Shishkin * struct msc_win_to_user_struct - data for copy_to_user() callback 1428ba82664cSAlexander Shishkin * @buf: userspace buffer to copy data to 1429ba82664cSAlexander Shishkin * @offset: running offset 1430ba82664cSAlexander Shishkin */ 1431ba82664cSAlexander Shishkin struct msc_win_to_user_struct { 1432ba82664cSAlexander Shishkin char __user *buf; 1433ba82664cSAlexander Shishkin unsigned long offset; 1434ba82664cSAlexander Shishkin }; 1435ba82664cSAlexander Shishkin 1436ba82664cSAlexander Shishkin /** 1437ba82664cSAlexander Shishkin * msc_win_to_user() - iterator for msc_buffer_iterate() to copy data to user 1438ba82664cSAlexander Shishkin * @data: callback's private data 1439ba82664cSAlexander Shishkin * @src: source buffer 1440ba82664cSAlexander Shishkin * @len: amount of data to copy from the source buffer 1441ba82664cSAlexander Shishkin */ 1442ba82664cSAlexander Shishkin static unsigned long msc_win_to_user(void *data, void *src, size_t len) 1443ba82664cSAlexander Shishkin { 1444ba82664cSAlexander Shishkin struct msc_win_to_user_struct *u = data; 1445ba82664cSAlexander Shishkin unsigned long ret; 1446ba82664cSAlexander Shishkin 1447ba82664cSAlexander Shishkin ret = copy_to_user(u->buf + u->offset, src, len); 1448ba82664cSAlexander Shishkin u->offset += len - ret; 1449ba82664cSAlexander Shishkin 1450ba82664cSAlexander Shishkin return ret; 1451ba82664cSAlexander Shishkin } 1452ba82664cSAlexander Shishkin 1453ba82664cSAlexander Shishkin 1454ba82664cSAlexander Shishkin /* 1455ba82664cSAlexander Shishkin * file operations' callbacks 1456ba82664cSAlexander Shishkin */ 1457ba82664cSAlexander Shishkin 1458ba82664cSAlexander Shishkin static int intel_th_msc_open(struct inode *inode, struct file *file) 1459ba82664cSAlexander Shishkin { 1460ba82664cSAlexander Shishkin struct intel_th_device *thdev = file->private_data; 1461ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 1462ba82664cSAlexander Shishkin struct msc_iter *iter; 1463ba82664cSAlexander Shishkin 1464ba82664cSAlexander Shishkin if (!capable(CAP_SYS_RAWIO)) 1465ba82664cSAlexander Shishkin return -EPERM; 1466ba82664cSAlexander Shishkin 1467ba82664cSAlexander Shishkin iter = msc_iter_install(msc); 1468a45ff6edSAlexander Shishkin if (IS_ERR(iter)) 1469a45ff6edSAlexander Shishkin return PTR_ERR(iter); 1470ba82664cSAlexander Shishkin 1471ba82664cSAlexander Shishkin file->private_data = iter; 1472ba82664cSAlexander Shishkin 1473ba82664cSAlexander Shishkin return nonseekable_open(inode, file); 1474ba82664cSAlexander Shishkin } 1475ba82664cSAlexander Shishkin 1476ba82664cSAlexander Shishkin static int intel_th_msc_release(struct inode *inode, struct file *file) 1477ba82664cSAlexander Shishkin { 1478ba82664cSAlexander Shishkin struct msc_iter *iter = file->private_data; 1479ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1480ba82664cSAlexander Shishkin 1481ba82664cSAlexander Shishkin msc_iter_remove(iter, msc); 1482ba82664cSAlexander Shishkin 1483ba82664cSAlexander Shishkin return 0; 1484ba82664cSAlexander Shishkin } 1485ba82664cSAlexander Shishkin 1486ba82664cSAlexander Shishkin static ssize_t 1487ba82664cSAlexander Shishkin msc_single_to_user(struct msc *msc, char __user *buf, loff_t off, size_t len) 1488ba82664cSAlexander Shishkin { 1489ed392688SAlexander Shishkin unsigned long size = msc->nr_pages << PAGE_SHIFT, rem = len; 1490ba82664cSAlexander Shishkin unsigned long start = off, tocopy = 0; 1491ba82664cSAlexander Shishkin 1492ba82664cSAlexander Shishkin if (msc->single_wrap) { 1493ba82664cSAlexander Shishkin start += msc->single_sz; 1494ba82664cSAlexander Shishkin if (start < size) { 1495ba82664cSAlexander Shishkin tocopy = min(rem, size - start); 1496ba82664cSAlexander Shishkin if (copy_to_user(buf, msc->base + start, tocopy)) 1497ba82664cSAlexander Shishkin return -EFAULT; 1498ba82664cSAlexander Shishkin 1499ba82664cSAlexander Shishkin buf += tocopy; 1500ba82664cSAlexander Shishkin rem -= tocopy; 1501ba82664cSAlexander Shishkin start += tocopy; 1502ba82664cSAlexander Shishkin } 1503ba82664cSAlexander Shishkin 1504ba82664cSAlexander Shishkin start &= size - 1; 1505ba82664cSAlexander Shishkin if (rem) { 1506ba82664cSAlexander Shishkin tocopy = min(rem, msc->single_sz - start); 1507ba82664cSAlexander Shishkin if (copy_to_user(buf, msc->base + start, tocopy)) 1508ba82664cSAlexander Shishkin return -EFAULT; 1509ba82664cSAlexander Shishkin 1510ba82664cSAlexander Shishkin rem -= tocopy; 1511ba82664cSAlexander Shishkin } 1512ba82664cSAlexander Shishkin 1513ba82664cSAlexander Shishkin return len - rem; 1514ba82664cSAlexander Shishkin } 1515ba82664cSAlexander Shishkin 1516ba82664cSAlexander Shishkin if (copy_to_user(buf, msc->base + start, rem)) 1517ba82664cSAlexander Shishkin return -EFAULT; 1518ba82664cSAlexander Shishkin 1519ba82664cSAlexander Shishkin return len; 1520ba82664cSAlexander Shishkin } 1521ba82664cSAlexander Shishkin 1522ba82664cSAlexander Shishkin static ssize_t intel_th_msc_read(struct file *file, char __user *buf, 1523ba82664cSAlexander Shishkin size_t len, loff_t *ppos) 1524ba82664cSAlexander Shishkin { 1525ba82664cSAlexander Shishkin struct msc_iter *iter = file->private_data; 1526ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1527ba82664cSAlexander Shishkin size_t size; 1528ba82664cSAlexander Shishkin loff_t off = *ppos; 1529ba82664cSAlexander Shishkin ssize_t ret = 0; 1530ba82664cSAlexander Shishkin 1531ba82664cSAlexander Shishkin if (!atomic_inc_unless_negative(&msc->user_count)) 1532ba82664cSAlexander Shishkin return 0; 1533ba82664cSAlexander Shishkin 1534ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE && !msc->single_wrap) 1535ba82664cSAlexander Shishkin size = msc->single_sz; 1536ba82664cSAlexander Shishkin else 1537ba82664cSAlexander Shishkin size = msc->nr_pages << PAGE_SHIFT; 1538ba82664cSAlexander Shishkin 1539ba82664cSAlexander Shishkin if (!size) 1540ba82664cSAlexander Shishkin goto put_count; 15412bed074aSLaurent FERT 15422bed074aSLaurent FERT if (off >= size) 15432bed074aSLaurent FERT goto put_count; 15442bed074aSLaurent FERT 1545ba82664cSAlexander Shishkin if (off + len >= size) 1546ba82664cSAlexander Shishkin len = size - off; 1547ba82664cSAlexander Shishkin 1548ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) { 1549ba82664cSAlexander Shishkin ret = msc_single_to_user(msc, buf, off, len); 1550ba82664cSAlexander Shishkin if (ret >= 0) 1551ba82664cSAlexander Shishkin *ppos += ret; 1552ba82664cSAlexander Shishkin } else if (msc->mode == MSC_MODE_MULTI) { 1553ba82664cSAlexander Shishkin struct msc_win_to_user_struct u = { 1554ba82664cSAlexander Shishkin .buf = buf, 1555ba82664cSAlexander Shishkin .offset = 0, 1556ba82664cSAlexander Shishkin }; 1557ba82664cSAlexander Shishkin 1558ba82664cSAlexander Shishkin ret = msc_buffer_iterate(iter, len, &u, msc_win_to_user); 1559ba82664cSAlexander Shishkin if (ret >= 0) 1560ba82664cSAlexander Shishkin *ppos = iter->offset; 1561ba82664cSAlexander Shishkin } else { 1562ce666be8SAlexander Shishkin ret = -EINVAL; 1563ba82664cSAlexander Shishkin } 1564ba82664cSAlexander Shishkin 1565ba82664cSAlexander Shishkin put_count: 1566ba82664cSAlexander Shishkin atomic_dec(&msc->user_count); 1567ba82664cSAlexander Shishkin 1568ba82664cSAlexander Shishkin return ret; 1569ba82664cSAlexander Shishkin } 1570ba82664cSAlexander Shishkin 1571ba82664cSAlexander Shishkin /* 1572ba82664cSAlexander Shishkin * vm operations callbacks (vm_ops) 1573ba82664cSAlexander Shishkin */ 1574ba82664cSAlexander Shishkin 1575ba82664cSAlexander Shishkin static void msc_mmap_open(struct vm_area_struct *vma) 1576ba82664cSAlexander Shishkin { 1577ba82664cSAlexander Shishkin struct msc_iter *iter = vma->vm_file->private_data; 1578ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1579ba82664cSAlexander Shishkin 1580ba82664cSAlexander Shishkin atomic_inc(&msc->mmap_count); 1581ba82664cSAlexander Shishkin } 1582ba82664cSAlexander Shishkin 1583ba82664cSAlexander Shishkin static void msc_mmap_close(struct vm_area_struct *vma) 1584ba82664cSAlexander Shishkin { 1585ba82664cSAlexander Shishkin struct msc_iter *iter = vma->vm_file->private_data; 1586ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1587ba82664cSAlexander Shishkin unsigned long pg; 1588ba82664cSAlexander Shishkin 1589ba82664cSAlexander Shishkin if (!atomic_dec_and_mutex_lock(&msc->mmap_count, &msc->buf_mutex)) 1590ba82664cSAlexander Shishkin return; 1591ba82664cSAlexander Shishkin 15920139aa7bSJoonsoo Kim /* drop page _refcounts */ 1593ba82664cSAlexander Shishkin for (pg = 0; pg < msc->nr_pages; pg++) { 1594ba82664cSAlexander Shishkin struct page *page = msc_buffer_get_page(msc, pg); 1595ba82664cSAlexander Shishkin 1596ba82664cSAlexander Shishkin if (WARN_ON_ONCE(!page)) 1597ba82664cSAlexander Shishkin continue; 1598ba82664cSAlexander Shishkin 1599ba82664cSAlexander Shishkin if (page->mapping) 1600ba82664cSAlexander Shishkin page->mapping = NULL; 1601ba82664cSAlexander Shishkin } 1602ba82664cSAlexander Shishkin 1603ba82664cSAlexander Shishkin /* last mapping -- drop user_count */ 1604ba82664cSAlexander Shishkin atomic_dec(&msc->user_count); 1605ba82664cSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 1606ba82664cSAlexander Shishkin } 1607ba82664cSAlexander Shishkin 160842df0509SSouptick Joarder static vm_fault_t msc_mmap_fault(struct vm_fault *vmf) 1609ba82664cSAlexander Shishkin { 161011bac800SDave Jiang struct msc_iter *iter = vmf->vma->vm_file->private_data; 1611ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1612ba82664cSAlexander Shishkin 1613ba82664cSAlexander Shishkin vmf->page = msc_buffer_get_page(msc, vmf->pgoff); 1614ba82664cSAlexander Shishkin if (!vmf->page) 1615ba82664cSAlexander Shishkin return VM_FAULT_SIGBUS; 1616ba82664cSAlexander Shishkin 1617ba82664cSAlexander Shishkin get_page(vmf->page); 161811bac800SDave Jiang vmf->page->mapping = vmf->vma->vm_file->f_mapping; 1619ba82664cSAlexander Shishkin vmf->page->index = vmf->pgoff; 1620ba82664cSAlexander Shishkin 1621ba82664cSAlexander Shishkin return 0; 1622ba82664cSAlexander Shishkin } 1623ba82664cSAlexander Shishkin 1624ba82664cSAlexander Shishkin static const struct vm_operations_struct msc_mmap_ops = { 1625ba82664cSAlexander Shishkin .open = msc_mmap_open, 1626ba82664cSAlexander Shishkin .close = msc_mmap_close, 1627ba82664cSAlexander Shishkin .fault = msc_mmap_fault, 1628ba82664cSAlexander Shishkin }; 1629ba82664cSAlexander Shishkin 1630ba82664cSAlexander Shishkin static int intel_th_msc_mmap(struct file *file, struct vm_area_struct *vma) 1631ba82664cSAlexander Shishkin { 1632ba82664cSAlexander Shishkin unsigned long size = vma->vm_end - vma->vm_start; 1633ba82664cSAlexander Shishkin struct msc_iter *iter = vma->vm_file->private_data; 1634ba82664cSAlexander Shishkin struct msc *msc = iter->msc; 1635ba82664cSAlexander Shishkin int ret = -EINVAL; 1636ba82664cSAlexander Shishkin 1637ba82664cSAlexander Shishkin if (!size || offset_in_page(size)) 1638ba82664cSAlexander Shishkin return -EINVAL; 1639ba82664cSAlexander Shishkin 1640ba82664cSAlexander Shishkin if (vma->vm_pgoff) 1641ba82664cSAlexander Shishkin return -EINVAL; 1642ba82664cSAlexander Shishkin 1643ba82664cSAlexander Shishkin /* grab user_count once per mmap; drop in msc_mmap_close() */ 1644ba82664cSAlexander Shishkin if (!atomic_inc_unless_negative(&msc->user_count)) 1645ba82664cSAlexander Shishkin return -EINVAL; 1646ba82664cSAlexander Shishkin 1647ba82664cSAlexander Shishkin if (msc->mode != MSC_MODE_SINGLE && 1648ba82664cSAlexander Shishkin msc->mode != MSC_MODE_MULTI) 1649ba82664cSAlexander Shishkin goto out; 1650ba82664cSAlexander Shishkin 1651ba82664cSAlexander Shishkin if (size >> PAGE_SHIFT != msc->nr_pages) 1652ba82664cSAlexander Shishkin goto out; 1653ba82664cSAlexander Shishkin 1654ba82664cSAlexander Shishkin atomic_set(&msc->mmap_count, 1); 1655ba82664cSAlexander Shishkin ret = 0; 1656ba82664cSAlexander Shishkin 1657ba82664cSAlexander Shishkin out: 1658ba82664cSAlexander Shishkin if (ret) 1659ba82664cSAlexander Shishkin atomic_dec(&msc->user_count); 1660ba82664cSAlexander Shishkin 1661ba82664cSAlexander Shishkin vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 1662ba82664cSAlexander Shishkin vma->vm_flags |= VM_DONTEXPAND | VM_DONTCOPY; 1663ba82664cSAlexander Shishkin vma->vm_ops = &msc_mmap_ops; 1664ba82664cSAlexander Shishkin return ret; 1665ba82664cSAlexander Shishkin } 1666ba82664cSAlexander Shishkin 1667ba82664cSAlexander Shishkin static const struct file_operations intel_th_msc_fops = { 1668ba82664cSAlexander Shishkin .open = intel_th_msc_open, 1669ba82664cSAlexander Shishkin .release = intel_th_msc_release, 1670ba82664cSAlexander Shishkin .read = intel_th_msc_read, 1671ba82664cSAlexander Shishkin .mmap = intel_th_msc_mmap, 1672ba82664cSAlexander Shishkin .llseek = no_llseek, 16738e9a2bebSAlexander Shishkin .owner = THIS_MODULE, 1674ba82664cSAlexander Shishkin }; 1675ba82664cSAlexander Shishkin 16768d415512SAlexander Shishkin static void intel_th_msc_wait_empty(struct intel_th_device *thdev) 16778d415512SAlexander Shishkin { 16788d415512SAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 16798d415512SAlexander Shishkin unsigned long count; 16808d415512SAlexander Shishkin u32 reg; 16818d415512SAlexander Shishkin 16828d415512SAlexander Shishkin for (reg = 0, count = MSC_PLE_WAITLOOP_DEPTH; 16838d415512SAlexander Shishkin count && !(reg & MSCSTS_PLE); count--) { 16848d415512SAlexander Shishkin reg = __raw_readl(msc->reg_base + REG_MSU_MSC0STS); 16858d415512SAlexander Shishkin cpu_relax(); 16868d415512SAlexander Shishkin } 16878d415512SAlexander Shishkin 16888d415512SAlexander Shishkin if (!count) 16898d415512SAlexander Shishkin dev_dbg(msc_dev(msc), "timeout waiting for MSC0 PLE\n"); 16908d415512SAlexander Shishkin } 16918d415512SAlexander Shishkin 1692ba82664cSAlexander Shishkin static int intel_th_msc_init(struct msc *msc) 1693ba82664cSAlexander Shishkin { 1694ba82664cSAlexander Shishkin atomic_set(&msc->user_count, -1); 1695ba82664cSAlexander Shishkin 1696397c7729SAlexander Shishkin msc->mode = msc->multi_is_broken ? MSC_MODE_SINGLE : MSC_MODE_MULTI; 1697ba82664cSAlexander Shishkin mutex_init(&msc->buf_mutex); 1698ba82664cSAlexander Shishkin INIT_LIST_HEAD(&msc->win_list); 1699ba82664cSAlexander Shishkin INIT_LIST_HEAD(&msc->iter_list); 1700ba82664cSAlexander Shishkin 1701ba82664cSAlexander Shishkin msc->burst_len = 1702ba82664cSAlexander Shishkin (ioread32(msc->reg_base + REG_MSU_MSC0CTL) & MSC_LEN) >> 1703ba82664cSAlexander Shishkin __ffs(MSC_LEN); 1704ba82664cSAlexander Shishkin 1705ba82664cSAlexander Shishkin return 0; 1706ba82664cSAlexander Shishkin } 1707ba82664cSAlexander Shishkin 170805b686b5SAlexander Shishkin static int msc_win_switch(struct msc *msc) 1709aad14ad3SAlexander Shishkin { 17109800db28SYueHaibing struct msc_window *first; 1711aad14ad3SAlexander Shishkin 171205b686b5SAlexander Shishkin if (list_empty(&msc->win_list)) 171305b686b5SAlexander Shishkin return -EINVAL; 171405b686b5SAlexander Shishkin 1715aad14ad3SAlexander Shishkin first = list_first_entry(&msc->win_list, struct msc_window, entry); 1716aad14ad3SAlexander Shishkin 1717aad14ad3SAlexander Shishkin if (msc_is_last_win(msc->cur_win)) 1718aad14ad3SAlexander Shishkin msc->cur_win = first; 1719aad14ad3SAlexander Shishkin else 1720aad14ad3SAlexander Shishkin msc->cur_win = list_next_entry(msc->cur_win, entry); 1721aad14ad3SAlexander Shishkin 172257b69a1fSAlexander Shishkin msc->base = msc_win_base(msc->cur_win); 172357b69a1fSAlexander Shishkin msc->base_addr = msc_win_base_dma(msc->cur_win); 1724aad14ad3SAlexander Shishkin 1725aad14ad3SAlexander Shishkin intel_th_trace_switch(msc->thdev); 172605b686b5SAlexander Shishkin 172705b686b5SAlexander Shishkin return 0; 1728aad14ad3SAlexander Shishkin } 1729aad14ad3SAlexander Shishkin 1730615c164dSAlexander Shishkin /** 1731615c164dSAlexander Shishkin * intel_th_msc_window_unlock - put the window back in rotation 1732615c164dSAlexander Shishkin * @dev: MSC device to which this relates 1733615c164dSAlexander Shishkin * @sgt: buffer's sg_table for the window, does nothing if NULL 1734615c164dSAlexander Shishkin */ 1735615c164dSAlexander Shishkin void intel_th_msc_window_unlock(struct device *dev, struct sg_table *sgt) 1736615c164dSAlexander Shishkin { 1737615c164dSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1738615c164dSAlexander Shishkin struct msc_window *win; 1739615c164dSAlexander Shishkin 1740615c164dSAlexander Shishkin if (!sgt) 1741615c164dSAlexander Shishkin return; 1742615c164dSAlexander Shishkin 1743615c164dSAlexander Shishkin win = msc_find_window(msc, sgt, false); 1744615c164dSAlexander Shishkin if (!win) 1745615c164dSAlexander Shishkin return; 1746615c164dSAlexander Shishkin 1747615c164dSAlexander Shishkin msc_win_set_lockout(win, WIN_LOCKED, WIN_READY); 17488622dfefSAlexander Shishkin if (msc->switch_on_unlock == win) { 17498622dfefSAlexander Shishkin msc->switch_on_unlock = NULL; 17508622dfefSAlexander Shishkin msc_win_switch(msc); 17518622dfefSAlexander Shishkin } 1752615c164dSAlexander Shishkin } 1753615c164dSAlexander Shishkin EXPORT_SYMBOL_GPL(intel_th_msc_window_unlock); 1754615c164dSAlexander Shishkin 1755615c164dSAlexander Shishkin static void msc_work(struct work_struct *work) 1756615c164dSAlexander Shishkin { 1757615c164dSAlexander Shishkin struct msc *msc = container_of(work, struct msc, work); 1758615c164dSAlexander Shishkin 1759615c164dSAlexander Shishkin intel_th_msc_deactivate(msc->thdev); 1760615c164dSAlexander Shishkin } 1761615c164dSAlexander Shishkin 1762aac8da65SAlexander Shishkin static irqreturn_t intel_th_msc_interrupt(struct intel_th_device *thdev) 1763aac8da65SAlexander Shishkin { 1764aac8da65SAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 1765aac8da65SAlexander Shishkin u32 msusts = ioread32(msc->msu_base + REG_MSU_MSUSTS); 1766aac8da65SAlexander Shishkin u32 mask = msc->index ? MSUSTS_MSC1BLAST : MSUSTS_MSC0BLAST; 1767615c164dSAlexander Shishkin struct msc_window *win, *next_win; 1768aac8da65SAlexander Shishkin 1769615c164dSAlexander Shishkin if (!msc->do_irq || !msc->mbuf) 1770aac8da65SAlexander Shishkin return IRQ_NONE; 1771615c164dSAlexander Shishkin 1772615c164dSAlexander Shishkin msusts &= mask; 1773615c164dSAlexander Shishkin 1774615c164dSAlexander Shishkin if (!msusts) 1775615c164dSAlexander Shishkin return msc->enabled ? IRQ_HANDLED : IRQ_NONE; 1776615c164dSAlexander Shishkin 1777615c164dSAlexander Shishkin iowrite32(msusts, msc->msu_base + REG_MSU_MSUSTS); 1778615c164dSAlexander Shishkin 1779615c164dSAlexander Shishkin if (!msc->enabled) 1780615c164dSAlexander Shishkin return IRQ_NONE; 1781615c164dSAlexander Shishkin 1782615c164dSAlexander Shishkin /* grab the window before we do the switch */ 1783615c164dSAlexander Shishkin win = msc->cur_win; 1784615c164dSAlexander Shishkin if (!win) 1785615c164dSAlexander Shishkin return IRQ_HANDLED; 1786615c164dSAlexander Shishkin next_win = msc_next_window(win); 1787615c164dSAlexander Shishkin if (!next_win) 1788615c164dSAlexander Shishkin return IRQ_HANDLED; 1789615c164dSAlexander Shishkin 1790615c164dSAlexander Shishkin /* next window: if READY, proceed, if LOCKED, stop the trace */ 1791615c164dSAlexander Shishkin if (msc_win_set_lockout(next_win, WIN_READY, WIN_INUSE)) { 17928622dfefSAlexander Shishkin if (msc->stop_on_full) 1793615c164dSAlexander Shishkin schedule_work(&msc->work); 17948622dfefSAlexander Shishkin else 17958622dfefSAlexander Shishkin msc->switch_on_unlock = next_win; 17968622dfefSAlexander Shishkin 1797615c164dSAlexander Shishkin return IRQ_HANDLED; 1798aac8da65SAlexander Shishkin } 1799aac8da65SAlexander Shishkin 1800615c164dSAlexander Shishkin /* current window: INUSE -> LOCKED */ 1801615c164dSAlexander Shishkin msc_win_set_lockout(win, WIN_INUSE, WIN_LOCKED); 1802615c164dSAlexander Shishkin 1803615c164dSAlexander Shishkin msc_win_switch(msc); 1804615c164dSAlexander Shishkin 1805615c164dSAlexander Shishkin if (msc->mbuf && msc->mbuf->ready) 1806615c164dSAlexander Shishkin msc->mbuf->ready(msc->mbuf_priv, win->sgt, 1807615c164dSAlexander Shishkin msc_win_total_sz(win)); 1808615c164dSAlexander Shishkin 1809aac8da65SAlexander Shishkin return IRQ_HANDLED; 1810aac8da65SAlexander Shishkin } 1811aac8da65SAlexander Shishkin 1812ba82664cSAlexander Shishkin static const char * const msc_mode[] = { 1813ba82664cSAlexander Shishkin [MSC_MODE_SINGLE] = "single", 1814ba82664cSAlexander Shishkin [MSC_MODE_MULTI] = "multi", 1815ba82664cSAlexander Shishkin [MSC_MODE_EXI] = "ExI", 1816ba82664cSAlexander Shishkin [MSC_MODE_DEBUG] = "debug", 1817ba82664cSAlexander Shishkin }; 1818ba82664cSAlexander Shishkin 1819ba82664cSAlexander Shishkin static ssize_t 1820ba82664cSAlexander Shishkin wrap_show(struct device *dev, struct device_attribute *attr, char *buf) 1821ba82664cSAlexander Shishkin { 1822ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1823ba82664cSAlexander Shishkin 1824ba82664cSAlexander Shishkin return scnprintf(buf, PAGE_SIZE, "%d\n", msc->wrap); 1825ba82664cSAlexander Shishkin } 1826ba82664cSAlexander Shishkin 1827ba82664cSAlexander Shishkin static ssize_t 1828ba82664cSAlexander Shishkin wrap_store(struct device *dev, struct device_attribute *attr, const char *buf, 1829ba82664cSAlexander Shishkin size_t size) 1830ba82664cSAlexander Shishkin { 1831ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1832ba82664cSAlexander Shishkin unsigned long val; 1833ba82664cSAlexander Shishkin int ret; 1834ba82664cSAlexander Shishkin 1835ba82664cSAlexander Shishkin ret = kstrtoul(buf, 10, &val); 1836ba82664cSAlexander Shishkin if (ret) 1837ba82664cSAlexander Shishkin return ret; 1838ba82664cSAlexander Shishkin 1839ba82664cSAlexander Shishkin msc->wrap = !!val; 1840ba82664cSAlexander Shishkin 1841ba82664cSAlexander Shishkin return size; 1842ba82664cSAlexander Shishkin } 1843ba82664cSAlexander Shishkin 1844ba82664cSAlexander Shishkin static DEVICE_ATTR_RW(wrap); 1845ba82664cSAlexander Shishkin 1846615c164dSAlexander Shishkin static void msc_buffer_unassign(struct msc *msc) 1847615c164dSAlexander Shishkin { 1848615c164dSAlexander Shishkin lockdep_assert_held(&msc->buf_mutex); 1849615c164dSAlexander Shishkin 1850615c164dSAlexander Shishkin if (!msc->mbuf) 1851615c164dSAlexander Shishkin return; 1852615c164dSAlexander Shishkin 1853615c164dSAlexander Shishkin msc->mbuf->unassign(msc->mbuf_priv); 1854615c164dSAlexander Shishkin msu_buffer_put(msc->mbuf); 1855615c164dSAlexander Shishkin msc->mbuf_priv = NULL; 1856615c164dSAlexander Shishkin msc->mbuf = NULL; 1857615c164dSAlexander Shishkin } 1858615c164dSAlexander Shishkin 1859ba82664cSAlexander Shishkin static ssize_t 1860ba82664cSAlexander Shishkin mode_show(struct device *dev, struct device_attribute *attr, char *buf) 1861ba82664cSAlexander Shishkin { 1862ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1863615c164dSAlexander Shishkin const char *mode = msc_mode[msc->mode]; 1864615c164dSAlexander Shishkin ssize_t ret; 1865ba82664cSAlexander Shishkin 1866615c164dSAlexander Shishkin mutex_lock(&msc->buf_mutex); 1867615c164dSAlexander Shishkin if (msc->mbuf) 1868615c164dSAlexander Shishkin mode = msc->mbuf->name; 1869615c164dSAlexander Shishkin ret = scnprintf(buf, PAGE_SIZE, "%s\n", mode); 1870615c164dSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 1871615c164dSAlexander Shishkin 1872615c164dSAlexander Shishkin return ret; 1873ba82664cSAlexander Shishkin } 1874ba82664cSAlexander Shishkin 1875ba82664cSAlexander Shishkin static ssize_t 1876ba82664cSAlexander Shishkin mode_store(struct device *dev, struct device_attribute *attr, const char *buf, 1877ba82664cSAlexander Shishkin size_t size) 1878ba82664cSAlexander Shishkin { 1879615c164dSAlexander Shishkin const struct msu_buffer *mbuf = NULL; 1880ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1881ba82664cSAlexander Shishkin size_t len = size; 1882615c164dSAlexander Shishkin char *cp, *mode; 1883ba82664cSAlexander Shishkin int i, ret; 1884ba82664cSAlexander Shishkin 1885ba82664cSAlexander Shishkin if (!capable(CAP_SYS_RAWIO)) 1886ba82664cSAlexander Shishkin return -EPERM; 1887ba82664cSAlexander Shishkin 1888ba82664cSAlexander Shishkin cp = memchr(buf, '\n', len); 1889ba82664cSAlexander Shishkin if (cp) 1890ba82664cSAlexander Shishkin len = cp - buf; 1891ba82664cSAlexander Shishkin 1892615c164dSAlexander Shishkin mode = kstrndup(buf, len, GFP_KERNEL); 1893063f097fSColin Ian King if (!mode) 1894063f097fSColin Ian King return -ENOMEM; 1895063f097fSColin Ian King 1896615c164dSAlexander Shishkin i = match_string(msc_mode, ARRAY_SIZE(msc_mode), mode); 18971fa1b6caSWei Yongjun if (i >= 0) { 18981fa1b6caSWei Yongjun kfree(mode); 1899615c164dSAlexander Shishkin goto found; 19001fa1b6caSWei Yongjun } 1901615c164dSAlexander Shishkin 1902615c164dSAlexander Shishkin /* Buffer sinks only work with a usable IRQ */ 1903615c164dSAlexander Shishkin if (!msc->do_irq) { 1904615c164dSAlexander Shishkin kfree(mode); 1905615c164dSAlexander Shishkin return -EINVAL; 1906615c164dSAlexander Shishkin } 1907615c164dSAlexander Shishkin 1908615c164dSAlexander Shishkin mbuf = msu_buffer_get(mode); 1909615c164dSAlexander Shishkin kfree(mode); 1910615c164dSAlexander Shishkin if (mbuf) 1911ba82664cSAlexander Shishkin goto found; 1912ba82664cSAlexander Shishkin 1913ba82664cSAlexander Shishkin return -EINVAL; 1914ba82664cSAlexander Shishkin 1915ba82664cSAlexander Shishkin found: 1916397c7729SAlexander Shishkin if (i == MSC_MODE_MULTI && msc->multi_is_broken) 1917397c7729SAlexander Shishkin return -EOPNOTSUPP; 1918397c7729SAlexander Shishkin 1919ba82664cSAlexander Shishkin mutex_lock(&msc->buf_mutex); 1920615c164dSAlexander Shishkin ret = 0; 1921615c164dSAlexander Shishkin 1922615c164dSAlexander Shishkin /* Same buffer: do nothing */ 1923615c164dSAlexander Shishkin if (mbuf && mbuf == msc->mbuf) { 1924615c164dSAlexander Shishkin /* put the extra reference we just got */ 1925615c164dSAlexander Shishkin msu_buffer_put(mbuf); 1926615c164dSAlexander Shishkin goto unlock; 1927615c164dSAlexander Shishkin } 1928615c164dSAlexander Shishkin 1929ba82664cSAlexander Shishkin ret = msc_buffer_unlocked_free_unless_used(msc); 1930615c164dSAlexander Shishkin if (ret) 1931615c164dSAlexander Shishkin goto unlock; 1932615c164dSAlexander Shishkin 1933615c164dSAlexander Shishkin if (mbuf) { 1934615c164dSAlexander Shishkin void *mbuf_priv = mbuf->assign(dev, &i); 1935615c164dSAlexander Shishkin 1936615c164dSAlexander Shishkin if (!mbuf_priv) { 1937615c164dSAlexander Shishkin ret = -ENOMEM; 1938615c164dSAlexander Shishkin goto unlock; 1939615c164dSAlexander Shishkin } 1940615c164dSAlexander Shishkin 1941615c164dSAlexander Shishkin msc_buffer_unassign(msc); 1942615c164dSAlexander Shishkin msc->mbuf_priv = mbuf_priv; 1943615c164dSAlexander Shishkin msc->mbuf = mbuf; 1944615c164dSAlexander Shishkin } else { 1945615c164dSAlexander Shishkin msc_buffer_unassign(msc); 1946615c164dSAlexander Shishkin } 1947615c164dSAlexander Shishkin 1948ba82664cSAlexander Shishkin msc->mode = i; 1949615c164dSAlexander Shishkin 1950615c164dSAlexander Shishkin unlock: 1951615c164dSAlexander Shishkin if (ret && mbuf) 1952615c164dSAlexander Shishkin msu_buffer_put(mbuf); 1953ba82664cSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 1954ba82664cSAlexander Shishkin 1955ba82664cSAlexander Shishkin return ret ? ret : size; 1956ba82664cSAlexander Shishkin } 1957ba82664cSAlexander Shishkin 1958ba82664cSAlexander Shishkin static DEVICE_ATTR_RW(mode); 1959ba82664cSAlexander Shishkin 1960ba82664cSAlexander Shishkin static ssize_t 1961ba82664cSAlexander Shishkin nr_pages_show(struct device *dev, struct device_attribute *attr, char *buf) 1962ba82664cSAlexander Shishkin { 1963ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1964ba82664cSAlexander Shishkin struct msc_window *win; 1965ba82664cSAlexander Shishkin size_t count = 0; 1966ba82664cSAlexander Shishkin 1967ba82664cSAlexander Shishkin mutex_lock(&msc->buf_mutex); 1968ba82664cSAlexander Shishkin 1969ba82664cSAlexander Shishkin if (msc->mode == MSC_MODE_SINGLE) 1970ba82664cSAlexander Shishkin count = scnprintf(buf, PAGE_SIZE, "%ld\n", msc->nr_pages); 1971ba82664cSAlexander Shishkin else if (msc->mode == MSC_MODE_MULTI) { 1972ba82664cSAlexander Shishkin list_for_each_entry(win, &msc->win_list, entry) { 1973ba82664cSAlexander Shishkin count += scnprintf(buf + count, PAGE_SIZE - count, 1974ba82664cSAlexander Shishkin "%d%c", win->nr_blocks, 1975ba82664cSAlexander Shishkin msc_is_last_win(win) ? '\n' : ','); 1976ba82664cSAlexander Shishkin } 1977ba82664cSAlexander Shishkin } else { 1978ba82664cSAlexander Shishkin count = scnprintf(buf, PAGE_SIZE, "unsupported\n"); 1979ba82664cSAlexander Shishkin } 1980ba82664cSAlexander Shishkin 1981ba82664cSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 1982ba82664cSAlexander Shishkin 1983ba82664cSAlexander Shishkin return count; 1984ba82664cSAlexander Shishkin } 1985ba82664cSAlexander Shishkin 1986ba82664cSAlexander Shishkin static ssize_t 1987ba82664cSAlexander Shishkin nr_pages_store(struct device *dev, struct device_attribute *attr, 1988ba82664cSAlexander Shishkin const char *buf, size_t size) 1989ba82664cSAlexander Shishkin { 1990ba82664cSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 1991ba82664cSAlexander Shishkin unsigned long val, *win = NULL, *rewin; 1992ba82664cSAlexander Shishkin size_t len = size; 1993ba82664cSAlexander Shishkin const char *p = buf; 1994ba82664cSAlexander Shishkin char *end, *s; 1995ba82664cSAlexander Shishkin int ret, nr_wins = 0; 1996ba82664cSAlexander Shishkin 1997ba82664cSAlexander Shishkin if (!capable(CAP_SYS_RAWIO)) 1998ba82664cSAlexander Shishkin return -EPERM; 1999ba82664cSAlexander Shishkin 2000ba82664cSAlexander Shishkin ret = msc_buffer_free_unless_used(msc); 2001ba82664cSAlexander Shishkin if (ret) 2002ba82664cSAlexander Shishkin return ret; 2003ba82664cSAlexander Shishkin 2004ba82664cSAlexander Shishkin /* scan the comma-separated list of allocation sizes */ 2005ba82664cSAlexander Shishkin end = memchr(buf, '\n', len); 2006ba82664cSAlexander Shishkin if (end) 2007ba82664cSAlexander Shishkin len = end - buf; 2008ba82664cSAlexander Shishkin 2009ba82664cSAlexander Shishkin do { 2010ba82664cSAlexander Shishkin end = memchr(p, ',', len); 2011ba82664cSAlexander Shishkin s = kstrndup(p, end ? end - p : len, GFP_KERNEL); 20126575cbd6SAlexander Shishkin if (!s) { 20136575cbd6SAlexander Shishkin ret = -ENOMEM; 20146575cbd6SAlexander Shishkin goto free_win; 20156575cbd6SAlexander Shishkin } 20166575cbd6SAlexander Shishkin 2017ba82664cSAlexander Shishkin ret = kstrtoul(s, 10, &val); 2018ba82664cSAlexander Shishkin kfree(s); 2019ba82664cSAlexander Shishkin 2020ba82664cSAlexander Shishkin if (ret || !val) 2021ba82664cSAlexander Shishkin goto free_win; 2022ba82664cSAlexander Shishkin 2023ba82664cSAlexander Shishkin if (nr_wins && msc->mode == MSC_MODE_SINGLE) { 2024ba82664cSAlexander Shishkin ret = -EINVAL; 2025ba82664cSAlexander Shishkin goto free_win; 2026ba82664cSAlexander Shishkin } 2027ba82664cSAlexander Shishkin 2028ba82664cSAlexander Shishkin nr_wins++; 2029f8f7e2bfSBartosz Golaszewski rewin = krealloc_array(win, nr_wins, sizeof(*win), GFP_KERNEL); 2030ba82664cSAlexander Shishkin if (!rewin) { 2031ba82664cSAlexander Shishkin kfree(win); 2032ba82664cSAlexander Shishkin return -ENOMEM; 2033ba82664cSAlexander Shishkin } 2034ba82664cSAlexander Shishkin 2035ba82664cSAlexander Shishkin win = rewin; 2036ba82664cSAlexander Shishkin win[nr_wins - 1] = val; 2037ba82664cSAlexander Shishkin 2038ba82664cSAlexander Shishkin if (!end) 2039ba82664cSAlexander Shishkin break; 2040ba82664cSAlexander Shishkin 2041ec5b5ad6SAlexander Shishkin /* consume the number and the following comma, hence +1 */ 2042ec5b5ad6SAlexander Shishkin len -= end - p + 1; 2043ba82664cSAlexander Shishkin p = end + 1; 2044ba82664cSAlexander Shishkin } while (len); 2045ba82664cSAlexander Shishkin 2046ba82664cSAlexander Shishkin mutex_lock(&msc->buf_mutex); 2047ba82664cSAlexander Shishkin ret = msc_buffer_alloc(msc, win, nr_wins); 2048ba82664cSAlexander Shishkin mutex_unlock(&msc->buf_mutex); 2049ba82664cSAlexander Shishkin 2050ba82664cSAlexander Shishkin free_win: 2051ba82664cSAlexander Shishkin kfree(win); 2052ba82664cSAlexander Shishkin 2053ba82664cSAlexander Shishkin return ret ? ret : size; 2054ba82664cSAlexander Shishkin } 2055ba82664cSAlexander Shishkin 2056ba82664cSAlexander Shishkin static DEVICE_ATTR_RW(nr_pages); 2057ba82664cSAlexander Shishkin 20586cac7866SAlexander Shishkin static ssize_t 20596cac7866SAlexander Shishkin win_switch_store(struct device *dev, struct device_attribute *attr, 20606cac7866SAlexander Shishkin const char *buf, size_t size) 20616cac7866SAlexander Shishkin { 20626cac7866SAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 20636cac7866SAlexander Shishkin unsigned long val; 20646cac7866SAlexander Shishkin int ret; 20656cac7866SAlexander Shishkin 20666cac7866SAlexander Shishkin ret = kstrtoul(buf, 10, &val); 20676cac7866SAlexander Shishkin if (ret) 20686cac7866SAlexander Shishkin return ret; 20696cac7866SAlexander Shishkin 20706cac7866SAlexander Shishkin if (val != 1) 20716cac7866SAlexander Shishkin return -EINVAL; 20726cac7866SAlexander Shishkin 207305b686b5SAlexander Shishkin ret = -EINVAL; 20746cac7866SAlexander Shishkin mutex_lock(&msc->buf_mutex); 2075615c164dSAlexander Shishkin /* 2076615c164dSAlexander Shishkin * Window switch can only happen in the "multi" mode. 2077615c164dSAlexander Shishkin * If a external buffer is engaged, they have the full 2078615c164dSAlexander Shishkin * control over window switching. 2079615c164dSAlexander Shishkin */ 208005b686b5SAlexander Shishkin if (msc->mode == MSC_MODE_MULTI && !msc->mbuf) 208105b686b5SAlexander Shishkin ret = msc_win_switch(msc); 20826cac7866SAlexander Shishkin mutex_unlock(&msc->buf_mutex); 20836cac7866SAlexander Shishkin 20846cac7866SAlexander Shishkin return ret ? ret : size; 20856cac7866SAlexander Shishkin } 20866cac7866SAlexander Shishkin 20876cac7866SAlexander Shishkin static DEVICE_ATTR_WO(win_switch); 20886cac7866SAlexander Shishkin 20898622dfefSAlexander Shishkin static ssize_t stop_on_full_show(struct device *dev, 20908622dfefSAlexander Shishkin struct device_attribute *attr, char *buf) 20918622dfefSAlexander Shishkin { 20928622dfefSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 20938622dfefSAlexander Shishkin 20948622dfefSAlexander Shishkin return sprintf(buf, "%d\n", msc->stop_on_full); 20958622dfefSAlexander Shishkin } 20968622dfefSAlexander Shishkin 20978622dfefSAlexander Shishkin static ssize_t stop_on_full_store(struct device *dev, 20988622dfefSAlexander Shishkin struct device_attribute *attr, 20998622dfefSAlexander Shishkin const char *buf, size_t size) 21008622dfefSAlexander Shishkin { 21018622dfefSAlexander Shishkin struct msc *msc = dev_get_drvdata(dev); 21028622dfefSAlexander Shishkin int ret; 21038622dfefSAlexander Shishkin 21048622dfefSAlexander Shishkin ret = kstrtobool(buf, &msc->stop_on_full); 21058622dfefSAlexander Shishkin if (ret) 21068622dfefSAlexander Shishkin return ret; 21078622dfefSAlexander Shishkin 21088622dfefSAlexander Shishkin return size; 21098622dfefSAlexander Shishkin } 21108622dfefSAlexander Shishkin 21118622dfefSAlexander Shishkin static DEVICE_ATTR_RW(stop_on_full); 21128622dfefSAlexander Shishkin 2113ba82664cSAlexander Shishkin static struct attribute *msc_output_attrs[] = { 2114ba82664cSAlexander Shishkin &dev_attr_wrap.attr, 2115ba82664cSAlexander Shishkin &dev_attr_mode.attr, 2116ba82664cSAlexander Shishkin &dev_attr_nr_pages.attr, 21176cac7866SAlexander Shishkin &dev_attr_win_switch.attr, 21188622dfefSAlexander Shishkin &dev_attr_stop_on_full.attr, 2119ba82664cSAlexander Shishkin NULL, 2120ba82664cSAlexander Shishkin }; 2121ba82664cSAlexander Shishkin 2122d9962f6fSRikard Falkeborn static const struct attribute_group msc_output_group = { 2123ba82664cSAlexander Shishkin .attrs = msc_output_attrs, 2124ba82664cSAlexander Shishkin }; 2125ba82664cSAlexander Shishkin 2126ba82664cSAlexander Shishkin static int intel_th_msc_probe(struct intel_th_device *thdev) 2127ba82664cSAlexander Shishkin { 2128ba82664cSAlexander Shishkin struct device *dev = &thdev->dev; 2129ba82664cSAlexander Shishkin struct resource *res; 2130ba82664cSAlexander Shishkin struct msc *msc; 2131ba82664cSAlexander Shishkin void __iomem *base; 2132ba82664cSAlexander Shishkin int err; 2133ba82664cSAlexander Shishkin 2134ba82664cSAlexander Shishkin res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 0); 2135ba82664cSAlexander Shishkin if (!res) 2136ba82664cSAlexander Shishkin return -ENODEV; 2137ba82664cSAlexander Shishkin 2138ba82664cSAlexander Shishkin base = devm_ioremap(dev, res->start, resource_size(res)); 213973061da0SDan Carpenter if (!base) 214073061da0SDan Carpenter return -ENOMEM; 2141ba82664cSAlexander Shishkin 2142ba82664cSAlexander Shishkin msc = devm_kzalloc(dev, sizeof(*msc), GFP_KERNEL); 2143ba82664cSAlexander Shishkin if (!msc) 2144ba82664cSAlexander Shishkin return -ENOMEM; 2145ba82664cSAlexander Shishkin 2146aac8da65SAlexander Shishkin res = intel_th_device_get_resource(thdev, IORESOURCE_IRQ, 1); 2147aac8da65SAlexander Shishkin if (!res) 2148aac8da65SAlexander Shishkin msc->do_irq = 1; 2149aac8da65SAlexander Shishkin 2150397c7729SAlexander Shishkin if (INTEL_TH_CAP(to_intel_th(thdev), multi_is_broken)) 2151397c7729SAlexander Shishkin msc->multi_is_broken = 1; 2152397c7729SAlexander Shishkin 2153ba82664cSAlexander Shishkin msc->index = thdev->id; 2154ba82664cSAlexander Shishkin 2155ba82664cSAlexander Shishkin msc->thdev = thdev; 2156ba82664cSAlexander Shishkin msc->reg_base = base + msc->index * 0x100; 2157aac8da65SAlexander Shishkin msc->msu_base = base; 2158aac8da65SAlexander Shishkin 2159615c164dSAlexander Shishkin INIT_WORK(&msc->work, msc_work); 2160ba82664cSAlexander Shishkin err = intel_th_msc_init(msc); 2161ba82664cSAlexander Shishkin if (err) 2162ba82664cSAlexander Shishkin return err; 2163ba82664cSAlexander Shishkin 2164ba82664cSAlexander Shishkin dev_set_drvdata(dev, msc); 2165ba82664cSAlexander Shishkin 2166ba82664cSAlexander Shishkin return 0; 2167ba82664cSAlexander Shishkin } 2168ba82664cSAlexander Shishkin 2169ba82664cSAlexander Shishkin static void intel_th_msc_remove(struct intel_th_device *thdev) 2170ba82664cSAlexander Shishkin { 2171f152dfeeSAlexander Shishkin struct msc *msc = dev_get_drvdata(&thdev->dev); 2172f152dfeeSAlexander Shishkin int ret; 2173f152dfeeSAlexander Shishkin 2174f152dfeeSAlexander Shishkin intel_th_msc_deactivate(thdev); 2175f152dfeeSAlexander Shishkin 2176f152dfeeSAlexander Shishkin /* 2177f152dfeeSAlexander Shishkin * Buffers should not be used at this point except if the 2178f152dfeeSAlexander Shishkin * output character device is still open and the parent 2179f152dfeeSAlexander Shishkin * device gets detached from its bus, which is a FIXME. 2180f152dfeeSAlexander Shishkin */ 2181f152dfeeSAlexander Shishkin ret = msc_buffer_free_unless_used(msc); 2182f152dfeeSAlexander Shishkin WARN_ON_ONCE(ret); 2183ba82664cSAlexander Shishkin } 2184ba82664cSAlexander Shishkin 2185ba82664cSAlexander Shishkin static struct intel_th_driver intel_th_msc_driver = { 2186ba82664cSAlexander Shishkin .probe = intel_th_msc_probe, 2187ba82664cSAlexander Shishkin .remove = intel_th_msc_remove, 2188aac8da65SAlexander Shishkin .irq = intel_th_msc_interrupt, 21898d415512SAlexander Shishkin .wait_empty = intel_th_msc_wait_empty, 2190ba82664cSAlexander Shishkin .activate = intel_th_msc_activate, 2191ba82664cSAlexander Shishkin .deactivate = intel_th_msc_deactivate, 2192ba82664cSAlexander Shishkin .fops = &intel_th_msc_fops, 21939d482aedSAlexander Shishkin .attr_group = &msc_output_group, 2194ba82664cSAlexander Shishkin .driver = { 2195ba82664cSAlexander Shishkin .name = "msc", 2196ba82664cSAlexander Shishkin .owner = THIS_MODULE, 2197ba82664cSAlexander Shishkin }, 2198ba82664cSAlexander Shishkin }; 2199ba82664cSAlexander Shishkin 2200ba82664cSAlexander Shishkin module_driver(intel_th_msc_driver, 2201ba82664cSAlexander Shishkin intel_th_driver_register, 2202ba82664cSAlexander Shishkin intel_th_driver_unregister); 2203ba82664cSAlexander Shishkin 2204ba82664cSAlexander Shishkin MODULE_LICENSE("GPL v2"); 2205ba82664cSAlexander Shishkin MODULE_DESCRIPTION("Intel(R) Trace Hub Memory Storage Unit driver"); 2206ba82664cSAlexander Shishkin MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>"); 2207