root/drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c

DEFINITIONS

1. vmw_cmdbuf_cur_lock
2. vmw_cmdbuf_cur_unlock
3. vmw_cmdbuf_header_inline_free
4. __vmw_cmdbuf_header_free
5. vmw_cmdbuf_header_free
6. vmw_cmdbuf_header_submit
7. vmw_cmdbuf_ctx_init
8. vmw_cmdbuf_ctx_submit
9. vmw_cmdbuf_ctx_process
10. vmw_cmdbuf_man_process
11. vmw_cmdbuf_ctx_add
12. vmw_cmdbuf_irqthread
13. vmw_cmdbuf_work_func
14. vmw_cmdbuf_man_idle
15. __vmw_cmdbuf_cur_flush
16. vmw_cmdbuf_cur_flush
17. vmw_cmdbuf_idle
18. vmw_cmdbuf_try_alloc
19. vmw_cmdbuf_alloc_space
20. vmw_cmdbuf_space_pool
21. vmw_cmdbuf_space_inline
22. vmw_cmdbuf_alloc
23. vmw_cmdbuf_reserve_cur
24. vmw_cmdbuf_commit_cur
25. vmw_cmdbuf_reserve
26. vmw_cmdbuf_commit
27. vmw_cmdbuf_send_device_command
28. vmw_cmdbuf_preempt
29. vmw_cmdbuf_startstop
30. vmw_cmdbuf_set_pool_size
31. vmw_cmdbuf_man_create
32. vmw_cmdbuf_remove_pool
33. vmw_cmdbuf_man_destroy

   1 // SPDX-License-Identifier: GPL-2.0 OR MIT
   2 /**************************************************************************
   3  *
   4  * Copyright 2015 VMware, Inc., Palo Alto, CA., USA
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27 
  28 #include <linux/dmapool.h>
  29 #include <linux/pci.h>
  30 
  31 #include <drm/ttm/ttm_bo_api.h>
  32 
  33 #include "vmwgfx_drv.h"
  34 
  35 /*
  36  * Size of inline command buffers. Try to make sure that a page size is a
  37  * multiple of the DMA pool allocation size.
  38  */
  39 #define VMW_CMDBUF_INLINE_ALIGN 64
  40 #define VMW_CMDBUF_INLINE_SIZE \
  41         (1024 - ALIGN(sizeof(SVGACBHeader), VMW_CMDBUF_INLINE_ALIGN))
  42 
  43 /**
  44  * struct vmw_cmdbuf_context - Command buffer context queues
  45  *
  46  * @submitted: List of command buffers that have been submitted to the
  47  * manager but not yet submitted to hardware.
  48  * @hw_submitted: List of command buffers submitted to hardware.
  49  * @preempted: List of preempted command buffers.
  50  * @num_hw_submitted: Number of buffers currently being processed by hardware
  51  */
  52 struct vmw_cmdbuf_context {
  53         struct list_head submitted;
  54         struct list_head hw_submitted;
  55         struct list_head preempted;
  56         unsigned num_hw_submitted;
  57         bool block_submission;
  58 };
  59 
  60 /**
  61  * struct vmw_cmdbuf_man: - Command buffer manager
  62  *
  63  * @cur_mutex: Mutex protecting the command buffer used for incremental small
  64  * kernel command submissions, @cur.
  65  * @space_mutex: Mutex to protect against starvation when we allocate
  66  * main pool buffer space.
  67  * @error_mutex: Mutex to serialize the work queue error handling.
  68  * Note this is not needed if the same workqueue handler
  69  * can't race with itself...
  70  * @work: A struct work_struct implementeing command buffer error handling.
  71  * Immutable.
  72  * @dev_priv: Pointer to the device private struct. Immutable.
  73  * @ctx: Array of command buffer context queues. The queues and the context
  74  * data is protected by @lock.
  75  * @error: List of command buffers that have caused device errors.
  76  * Protected by @lock.
  77  * @mm: Range manager for the command buffer space. Manager allocations and
  78  * frees are protected by @lock.
  79  * @cmd_space: Buffer object for the command buffer space, unless we were
  80  * able to make a contigous coherent DMA memory allocation, @handle. Immutable.
  81  * @map_obj: Mapping state for @cmd_space. Immutable.
  82  * @map: Pointer to command buffer space. May be a mapped buffer object or
  83  * a contigous coherent DMA memory allocation. Immutable.
  84  * @cur: Command buffer for small kernel command submissions. Protected by
  85  * the @cur_mutex.
  86  * @cur_pos: Space already used in @cur. Protected by @cur_mutex.
  87  * @default_size: Default size for the @cur command buffer. Immutable.
  88  * @max_hw_submitted: Max number of in-flight command buffers the device can
  89  * handle. Immutable.
  90  * @lock: Spinlock protecting command submission queues.
  91  * @header: Pool of DMA memory for device command buffer headers.
  92  * Internal protection.
  93  * @dheaders: Pool of DMA memory for device command buffer headers with trailing
  94  * space for inline data. Internal protection.
  95  * @alloc_queue: Wait queue for processes waiting to allocate command buffer
  96  * space.
  97  * @idle_queue: Wait queue for processes waiting for command buffer idle.
  98  * @irq_on: Whether the process function has requested irq to be turned on.
  99  * Protected by @lock.
 100  * @using_mob: Whether the command buffer space is a MOB or a contigous DMA
 101  * allocation. Immutable.
 102  * @has_pool: Has a large pool of DMA memory which allows larger allocations.
 103  * Typically this is false only during bootstrap.
 104  * @handle: DMA address handle for the command buffer space if @using_mob is
 105  * false. Immutable.
 106  * @size: The size of the command buffer space. Immutable.
 107  * @num_contexts: Number of contexts actually enabled.
 108  */
 109 struct vmw_cmdbuf_man {
 110         struct mutex cur_mutex;
 111         struct mutex space_mutex;
 112         struct mutex error_mutex;
 113         struct work_struct work;
 114         struct vmw_private *dev_priv;
 115         struct vmw_cmdbuf_context ctx[SVGA_CB_CONTEXT_MAX];
 116         struct list_head error;
 117         struct drm_mm mm;
 118         struct ttm_buffer_object *cmd_space;
 119         struct ttm_bo_kmap_obj map_obj;
 120         u8 *map;
 121         struct vmw_cmdbuf_header *cur;
 122         size_t cur_pos;
 123         size_t default_size;
 124         unsigned max_hw_submitted;
 125         spinlock_t lock;
 126         struct dma_pool *headers;
 127         struct dma_pool *dheaders;
 128         wait_queue_head_t alloc_queue;
 129         wait_queue_head_t idle_queue;
 130         bool irq_on;
 131         bool using_mob;
 132         bool has_pool;
 133         dma_addr_t handle;
 134         size_t size;
 135         u32 num_contexts;
 136 };
 137 
 138 /**
 139  * struct vmw_cmdbuf_header - Command buffer metadata
 140  *
 141  * @man: The command buffer manager.
 142  * @cb_header: Device command buffer header, allocated from a DMA pool.
 143  * @cb_context: The device command buffer context.
 144  * @list: List head for attaching to the manager lists.
 145  * @node: The range manager node.
 146  * @handle. The DMA address of @cb_header. Handed to the device on command
 147  * buffer submission.
 148  * @cmd: Pointer to the command buffer space of this buffer.
 149  * @size: Size of the command buffer space of this buffer.
 150  * @reserved: Reserved space of this buffer.
 151  * @inline_space: Whether inline command buffer space is used.
 152  */
 153 struct vmw_cmdbuf_header {
 154         struct vmw_cmdbuf_man *man;
 155         SVGACBHeader *cb_header;
 156         SVGACBContext cb_context;
 157         struct list_head list;
 158         struct drm_mm_node node;
 159         dma_addr_t handle;
 160         u8 *cmd;
 161         size_t size;
 162         size_t reserved;
 163         bool inline_space;
 164 };
 165 
 166 /**
 167  * struct vmw_cmdbuf_dheader - Device command buffer header with inline
 168  * command buffer space.
 169  *
 170  * @cb_header: Device command buffer header.
 171  * @cmd: Inline command buffer space.
 172  */
 173 struct vmw_cmdbuf_dheader {
 174         SVGACBHeader cb_header;
 175         u8 cmd[VMW_CMDBUF_INLINE_SIZE] __aligned(VMW_CMDBUF_INLINE_ALIGN);
 176 };
 177 
 178 /**
 179  * struct vmw_cmdbuf_alloc_info - Command buffer space allocation metadata
 180  *
 181  * @page_size: Size of requested command buffer space in pages.
 182  * @node: Pointer to the range manager node.
 183  * @done: True if this allocation has succeeded.
 184  */
 185 struct vmw_cmdbuf_alloc_info {
 186         size_t page_size;
 187         struct drm_mm_node *node;
 188         bool done;
 189 };
 190 
 191 /* Loop over each context in the command buffer manager. */
 192 #define for_each_cmdbuf_ctx(_man, _i, _ctx)                             \
 193         for (_i = 0, _ctx = &(_man)->ctx[0]; (_i) < (_man)->num_contexts; \
 194              ++(_i), ++(_ctx))
 195 
 196 static int vmw_cmdbuf_startstop(struct vmw_cmdbuf_man *man, u32 context,
 197                                 bool enable);
 198 static int vmw_cmdbuf_preempt(struct vmw_cmdbuf_man *man, u32 context);
 199 
 200 /**
 201  * vmw_cmdbuf_cur_lock - Helper to lock the cur_mutex.
 202  *
 203  * @man: The range manager.
 204  * @interruptible: Whether to wait interruptible when locking.
 205  */
 206 static int vmw_cmdbuf_cur_lock(struct vmw_cmdbuf_man *man, bool interruptible)
 207 {
 208         if (interruptible) {
 209                 if (mutex_lock_interruptible(&man->cur_mutex))
 210                         return -ERESTARTSYS;
 211         } else {
 212                 mutex_lock(&man->cur_mutex);
 213         }
 214 
 215         return 0;
 216 }
 217 
 218 /**
 219  * vmw_cmdbuf_cur_unlock - Helper to unlock the cur_mutex.
 220  *
 221  * @man: The range manager.
 222  */
 223 static void vmw_cmdbuf_cur_unlock(struct vmw_cmdbuf_man *man)
 224 {
 225         mutex_unlock(&man->cur_mutex);
 226 }
 227 
 228 /**
 229  * vmw_cmdbuf_header_inline_free - Free a struct vmw_cmdbuf_header that has
 230  * been used for the device context with inline command buffers.
 231  * Need not be called locked.
 232  *
 233  * @header: Pointer to the header to free.
 234  */
 235 static void vmw_cmdbuf_header_inline_free(struct vmw_cmdbuf_header *header)
 236 {
 237         struct vmw_cmdbuf_dheader *dheader;
 238 
 239         if (WARN_ON_ONCE(!header->inline_space))
 240                 return;
 241 
 242         dheader = container_of(header->cb_header, struct vmw_cmdbuf_dheader,
 243                                cb_header);
 244         dma_pool_free(header->man->dheaders, dheader, header->handle);
 245         kfree(header);
 246 }
 247 
 248 /**
 249  * __vmw_cmdbuf_header_free - Free a struct vmw_cmdbuf_header  and its
 250  * associated structures.
 251  *
 252  * header: Pointer to the header to free.
 253  *
 254  * For internal use. Must be called with man::lock held.
 255  */
 256 static void __vmw_cmdbuf_header_free(struct vmw_cmdbuf_header *header)
 257 {
 258         struct vmw_cmdbuf_man *man = header->man;
 259 
 260         lockdep_assert_held_once(&man->lock);
 261 
 262         if (header->inline_space) {
 263                 vmw_cmdbuf_header_inline_free(header);
 264                 return;
 265         }
 266 
 267         drm_mm_remove_node(&header->node);
 268         wake_up_all(&man->alloc_queue);
 269         if (header->cb_header)
 270                 dma_pool_free(man->headers, header->cb_header,
 271                               header->handle);
 272         kfree(header);
 273 }
 274 
 275 /**
 276  * vmw_cmdbuf_header_free - Free a struct vmw_cmdbuf_header  and its
 277  * associated structures.
 278  *
 279  * @header: Pointer to the header to free.
 280  */
 281 void vmw_cmdbuf_header_free(struct vmw_cmdbuf_header *header)
 282 {
 283         struct vmw_cmdbuf_man *man = header->man;
 284 
 285         /* Avoid locking if inline_space */
 286         if (header->inline_space) {
 287                 vmw_cmdbuf_header_inline_free(header);
 288                 return;
 289         }
 290         spin_lock(&man->lock);
 291         __vmw_cmdbuf_header_free(header);
 292         spin_unlock(&man->lock);
 293 }
 294 
 295 
 296 /**
 297  * vmw_cmbuf_header_submit: Submit a command buffer to hardware.
 298  *
 299  * @header: The header of the buffer to submit.
 300  */
 301 static int vmw_cmdbuf_header_submit(struct vmw_cmdbuf_header *header)
 302 {
 303         struct vmw_cmdbuf_man *man = header->man;
 304         u32 val;
 305 
 306         val = upper_32_bits(header->handle);
 307         vmw_write(man->dev_priv, SVGA_REG_COMMAND_HIGH, val);
 308 
 309         val = lower_32_bits(header->handle);
 310         val |= header->cb_context & SVGA_CB_CONTEXT_MASK;
 311         vmw_write(man->dev_priv, SVGA_REG_COMMAND_LOW, val);
 312 
 313         return header->cb_header->status;
 314 }
 315 
 316 /**
 317  * vmw_cmdbuf_ctx_init: Initialize a command buffer context.
 318  *
 319  * @ctx: The command buffer context to initialize
 320  */
 321 static void vmw_cmdbuf_ctx_init(struct vmw_cmdbuf_context *ctx)
 322 {
 323         INIT_LIST_HEAD(&ctx->hw_submitted);
 324         INIT_LIST_HEAD(&ctx->submitted);
 325         INIT_LIST_HEAD(&ctx->preempted);
 326         ctx->num_hw_submitted = 0;
 327 }
 328 
 329 /**
 330  * vmw_cmdbuf_ctx_submit: Submit command buffers from a command buffer
 331  * context.
 332  *
 333  * @man: The command buffer manager.
 334  * @ctx: The command buffer context.
 335  *
 336  * Submits command buffers to hardware until there are no more command
 337  * buffers to submit or the hardware can't handle more command buffers.
 338  */
 339 static void vmw_cmdbuf_ctx_submit(struct vmw_cmdbuf_man *man,
 340                                   struct vmw_cmdbuf_context *ctx)
 341 {
 342         while (ctx->num_hw_submitted < man->max_hw_submitted &&
 343                !list_empty(&ctx->submitted) &&
 344                !ctx->block_submission) {
 345                 struct vmw_cmdbuf_header *entry;
 346                 SVGACBStatus status;
 347 
 348                 entry = list_first_entry(&ctx->submitted,
 349                                          struct vmw_cmdbuf_header,
 350                                          list);
 351 
 352                 status = vmw_cmdbuf_header_submit(entry);
 353 
 354                 /* This should never happen */
 355                 if (WARN_ON_ONCE(status == SVGA_CB_STATUS_QUEUE_FULL)) {
 356                         entry->cb_header->status = SVGA_CB_STATUS_NONE;
 357                         break;
 358                 }
 359 
 360                 list_del(&entry->list);
 361                 list_add_tail(&entry->list, &ctx->hw_submitted);
 362                 ctx->num_hw_submitted++;
 363         }
 364 
 365 }
 366 
 367 /**
 368  * vmw_cmdbuf_ctx_submit: Process a command buffer context.
 369  *
 370  * @man: The command buffer manager.
 371  * @ctx: The command buffer context.
 372  *
 373  * Submit command buffers to hardware if possible, and process finished
 374  * buffers. Typically freeing them, but on preemption or error take
 375  * appropriate action. Wake up waiters if appropriate.
 376  */
 377 static void vmw_cmdbuf_ctx_process(struct vmw_cmdbuf_man *man,
 378                                    struct vmw_cmdbuf_context *ctx,
 379                                    int *notempty)
 380 {
 381         struct vmw_cmdbuf_header *entry, *next;
 382 
 383         vmw_cmdbuf_ctx_submit(man, ctx);
 384 
 385         list_for_each_entry_safe(entry, next, &ctx->hw_submitted, list) {
 386                 SVGACBStatus status = entry->cb_header->status;
 387 
 388                 if (status == SVGA_CB_STATUS_NONE)
 389                         break;
 390 
 391                 list_del(&entry->list);
 392                 wake_up_all(&man->idle_queue);
 393                 ctx->num_hw_submitted--;
 394                 switch (status) {
 395                 case SVGA_CB_STATUS_COMPLETED:
 396                         __vmw_cmdbuf_header_free(entry);
 397                         break;
 398                 case SVGA_CB_STATUS_COMMAND_ERROR:
 399                         WARN_ONCE(true, "Command buffer error.\n");
 400                         entry->cb_header->status = SVGA_CB_STATUS_NONE;
 401                         list_add_tail(&entry->list, &man->error);
 402                         schedule_work(&man->work);
 403                         break;
 404                 case SVGA_CB_STATUS_PREEMPTED:
 405                         entry->cb_header->status = SVGA_CB_STATUS_NONE;
 406                         list_add_tail(&entry->list, &ctx->preempted);
 407                         break;
 408                 case SVGA_CB_STATUS_CB_HEADER_ERROR:
 409                         WARN_ONCE(true, "Command buffer header error.\n");
 410                         __vmw_cmdbuf_header_free(entry);
 411                         break;
 412                 default:
 413                         WARN_ONCE(true, "Undefined command buffer status.\n");
 414                         __vmw_cmdbuf_header_free(entry);
 415                         break;
 416                 }
 417         }
 418 
 419         vmw_cmdbuf_ctx_submit(man, ctx);
 420         if (!list_empty(&ctx->submitted))
 421                 (*notempty)++;
 422 }
 423 
 424 /**
 425  * vmw_cmdbuf_man_process - Process all command buffer contexts and
 426  * switch on and off irqs as appropriate.
 427  *
 428  * @man: The command buffer manager.
 429  *
 430  * Calls vmw_cmdbuf_ctx_process() on all contexts. If any context has
 431  * command buffers left that are not submitted to hardware, Make sure
 432  * IRQ handling is turned on. Otherwise, make sure it's turned off.
 433  */
 434 static void vmw_cmdbuf_man_process(struct vmw_cmdbuf_man *man)
 435 {
 436         int notempty;
 437         struct vmw_cmdbuf_context *ctx;
 438         int i;
 439 
 440 retry:
 441         notempty = 0;
 442         for_each_cmdbuf_ctx(man, i, ctx)
 443                 vmw_cmdbuf_ctx_process(man, ctx, &notempty);
 444 
 445         if (man->irq_on && !notempty) {
 446                 vmw_generic_waiter_remove(man->dev_priv,
 447                                           SVGA_IRQFLAG_COMMAND_BUFFER,
 448                                           &man->dev_priv->cmdbuf_waiters);
 449                 man->irq_on = false;
 450         } else if (!man->irq_on && notempty) {
 451                 vmw_generic_waiter_add(man->dev_priv,
 452                                        SVGA_IRQFLAG_COMMAND_BUFFER,
 453                                        &man->dev_priv->cmdbuf_waiters);
 454                 man->irq_on = true;
 455 
 456                 /* Rerun in case we just missed an irq. */
 457                 goto retry;
 458         }
 459 }
 460 
 461 /**
 462  * vmw_cmdbuf_ctx_add - Schedule a command buffer for submission on a
 463  * command buffer context
 464  *
 465  * @man: The command buffer manager.
 466  * @header: The header of the buffer to submit.
 467  * @cb_context: The command buffer context to use.
 468  *
 469  * This function adds @header to the "submitted" queue of the command
 470  * buffer context identified by @cb_context. It then calls the command buffer
 471  * manager processing to potentially submit the buffer to hardware.
 472  * @man->lock needs to be held when calling this function.
 473  */
 474 static void vmw_cmdbuf_ctx_add(struct vmw_cmdbuf_man *man,
 475                                struct vmw_cmdbuf_header *header,
 476                                SVGACBContext cb_context)
 477 {
 478         if (!(header->cb_header->flags & SVGA_CB_FLAG_DX_CONTEXT))
 479                 header->cb_header->dxContext = 0;
 480         header->cb_context = cb_context;
 481         list_add_tail(&header->list, &man->ctx[cb_context].submitted);
 482 
 483         vmw_cmdbuf_man_process(man);
 484 }
 485 
 486 /**
 487  * vmw_cmdbuf_irqthread - The main part of the command buffer interrupt
 488  * handler implemented as a threaded irq task.
 489  *
 490  * @man: Pointer to the command buffer manager.
 491  *
 492  * The bottom half of the interrupt handler simply calls into the
 493  * command buffer processor to free finished buffers and submit any
 494  * queued buffers to hardware.
 495  */
 496 void vmw_cmdbuf_irqthread(struct vmw_cmdbuf_man *man)
 497 {
 498         spin_lock(&man->lock);
 499         vmw_cmdbuf_man_process(man);
 500         spin_unlock(&man->lock);
 501 }
 502 
 503 /**
 504  * vmw_cmdbuf_work_func - The deferred work function that handles
 505  * command buffer errors.
 506  *
 507  * @work: The work func closure argument.
 508  *
 509  * Restarting the command buffer context after an error requires process
 510  * context, so it is deferred to this work function.
 511  */
 512 static void vmw_cmdbuf_work_func(struct work_struct *work)
 513 {
 514         struct vmw_cmdbuf_man *man =
 515                 container_of(work, struct vmw_cmdbuf_man, work);
 516         struct vmw_cmdbuf_header *entry, *next;
 517         uint32_t dummy;
 518         bool send_fence = false;
 519         struct list_head restart_head[SVGA_CB_CONTEXT_MAX];
 520         int i;
 521         struct vmw_cmdbuf_context *ctx;
 522         bool global_block = false;
 523 
 524         for_each_cmdbuf_ctx(man, i, ctx)
 525                 INIT_LIST_HEAD(&restart_head[i]);
 526 
 527         mutex_lock(&man->error_mutex);
 528         spin_lock(&man->lock);
 529         list_for_each_entry_safe(entry, next, &man->error, list) {
 530                 SVGACBHeader *cb_hdr = entry->cb_header;
 531                 SVGA3dCmdHeader *header = (SVGA3dCmdHeader *)
 532                         (entry->cmd + cb_hdr->errorOffset);
 533                 u32 error_cmd_size, new_start_offset;
 534                 const char *cmd_name;
 535 
 536                 list_del_init(&entry->list);
 537                 global_block = true;
 538 
 539                 if (!vmw_cmd_describe(header, &error_cmd_size, &cmd_name)) {
 540                         VMW_DEBUG_USER("Unknown command causing device error.\n");
 541                         VMW_DEBUG_USER("Command buffer offset is %lu\n",
 542                                        (unsigned long) cb_hdr->errorOffset);
 543                         __vmw_cmdbuf_header_free(entry);
 544                         send_fence = true;
 545                         continue;
 546                 }
 547 
 548                 VMW_DEBUG_USER("Command \"%s\" causing device error.\n",
 549                                cmd_name);
 550                 VMW_DEBUG_USER("Command buffer offset is %lu\n",
 551                                (unsigned long) cb_hdr->errorOffset);
 552                 VMW_DEBUG_USER("Command size is %lu\n",
 553                                (unsigned long) error_cmd_size);
 554 
 555                 new_start_offset = cb_hdr->errorOffset + error_cmd_size;
 556 
 557                 if (new_start_offset >= cb_hdr->length) {
 558                         __vmw_cmdbuf_header_free(entry);
 559                         send_fence = true;
 560                         continue;
 561                 }
 562 
 563                 if (man->using_mob)
 564                         cb_hdr->ptr.mob.mobOffset += new_start_offset;
 565                 else
 566                         cb_hdr->ptr.pa += (u64) new_start_offset;
 567 
 568                 entry->cmd += new_start_offset;
 569                 cb_hdr->length -= new_start_offset;
 570                 cb_hdr->errorOffset = 0;
 571                 cb_hdr->offset = 0;
 572 
 573                 list_add_tail(&entry->list, &restart_head[entry->cb_context]);
 574         }
 575 
 576         for_each_cmdbuf_ctx(man, i, ctx)
 577                 man->ctx[i].block_submission = true;
 578 
 579         spin_unlock(&man->lock);
 580 
 581         /* Preempt all contexts */
 582         if (global_block && vmw_cmdbuf_preempt(man, 0))
 583                 DRM_ERROR("Failed preempting command buffer contexts\n");
 584 
 585         spin_lock(&man->lock);
 586         for_each_cmdbuf_ctx(man, i, ctx) {
 587                 /* Move preempted command buffers to the preempted queue. */
 588                 vmw_cmdbuf_ctx_process(man, ctx, &dummy);
 589 
 590                 /*
 591                  * Add the preempted queue after the command buffer
 592                  * that caused an error.
 593                  */
 594                 list_splice_init(&ctx->preempted, restart_head[i].prev);
 595 
 596                 /*
 597                  * Finally add all command buffers first in the submitted
 598                  * queue, to rerun them.
 599                  */
 600 
 601                 ctx->block_submission = false;
 602                 list_splice_init(&restart_head[i], &ctx->submitted);
 603         }
 604 
 605         vmw_cmdbuf_man_process(man);
 606         spin_unlock(&man->lock);
 607 
 608         if (global_block && vmw_cmdbuf_startstop(man, 0, true))
 609                 DRM_ERROR("Failed restarting command buffer contexts\n");
 610 
 611         /* Send a new fence in case one was removed */
 612         if (send_fence) {
 613                 vmw_fifo_send_fence(man->dev_priv, &dummy);
 614                 wake_up_all(&man->idle_queue);
 615         }
 616 
 617         mutex_unlock(&man->error_mutex);
 618 }
 619 
 620 /**
 621  * vmw_cmdbuf_man idle - Check whether the command buffer manager is idle.
 622  *
 623  * @man: The command buffer manager.
 624  * @check_preempted: Check also the preempted queue for pending command buffers.
 625  *
 626  */
 627 static bool vmw_cmdbuf_man_idle(struct vmw_cmdbuf_man *man,
 628                                 bool check_preempted)
 629 {
 630         struct vmw_cmdbuf_context *ctx;
 631         bool idle = false;
 632         int i;
 633 
 634         spin_lock(&man->lock);
 635         vmw_cmdbuf_man_process(man);
 636         for_each_cmdbuf_ctx(man, i, ctx) {
 637                 if (!list_empty(&ctx->submitted) ||
 638                     !list_empty(&ctx->hw_submitted) ||
 639                     (check_preempted && !list_empty(&ctx->preempted)))
 640                         goto out_unlock;
 641         }
 642 
 643         idle = list_empty(&man->error);
 644 
 645 out_unlock:
 646         spin_unlock(&man->lock);
 647 
 648         return idle;
 649 }
 650 
 651 /**
 652  * __vmw_cmdbuf_cur_flush - Flush the current command buffer for small kernel
 653  * command submissions
 654  *
 655  * @man: The command buffer manager.
 656  *
 657  * Flushes the current command buffer without allocating a new one. A new one
 658  * is automatically allocated when needed. Call with @man->cur_mutex held.
 659  */
 660 static void __vmw_cmdbuf_cur_flush(struct vmw_cmdbuf_man *man)
 661 {
 662         struct vmw_cmdbuf_header *cur = man->cur;
 663 
 664         lockdep_assert_held_once(&man->cur_mutex);
 665 
 666         if (!cur)
 667                 return;
 668 
 669         spin_lock(&man->lock);
 670         if (man->cur_pos == 0) {
 671                 __vmw_cmdbuf_header_free(cur);
 672                 goto out_unlock;
 673         }
 674 
 675         man->cur->cb_header->length = man->cur_pos;
 676         vmw_cmdbuf_ctx_add(man, man->cur, SVGA_CB_CONTEXT_0);
 677 out_unlock:
 678         spin_unlock(&man->lock);
 679         man->cur = NULL;
 680         man->cur_pos = 0;
 681 }
 682 
 683 /**
 684  * vmw_cmdbuf_cur_flush - Flush the current command buffer for small kernel
 685  * command submissions
 686  *
 687  * @man: The command buffer manager.
 688  * @interruptible: Whether to sleep interruptible when sleeping.
 689  *
 690  * Flushes the current command buffer without allocating a new one. A new one
 691  * is automatically allocated when needed.
 692  */
 693 int vmw_cmdbuf_cur_flush(struct vmw_cmdbuf_man *man,
 694                          bool interruptible)
 695 {
 696         int ret = vmw_cmdbuf_cur_lock(man, interruptible);
 697 
 698         if (ret)
 699                 return ret;
 700 
 701         __vmw_cmdbuf_cur_flush(man);
 702         vmw_cmdbuf_cur_unlock(man);
 703 
 704         return 0;
 705 }
 706 
 707 /**
 708  * vmw_cmdbuf_idle - Wait for command buffer manager idle.
 709  *
 710  * @man: The command buffer manager.
 711  * @interruptible: Sleep interruptible while waiting.
 712  * @timeout: Time out after this many ticks.
 713  *
 714  * Wait until the command buffer manager has processed all command buffers,
 715  * or until a timeout occurs. If a timeout occurs, the function will return
 716  * -EBUSY.
 717  */
 718 int vmw_cmdbuf_idle(struct vmw_cmdbuf_man *man, bool interruptible,
 719                     unsigned long timeout)
 720 {
 721         int ret;
 722 
 723         ret = vmw_cmdbuf_cur_flush(man, interruptible);
 724         vmw_generic_waiter_add(man->dev_priv,
 725                                SVGA_IRQFLAG_COMMAND_BUFFER,
 726                                &man->dev_priv->cmdbuf_waiters);
 727 
 728         if (interruptible) {
 729                 ret = wait_event_interruptible_timeout
 730                         (man->idle_queue, vmw_cmdbuf_man_idle(man, true),
 731                          timeout);
 732         } else {
 733                 ret = wait_event_timeout
 734                         (man->idle_queue, vmw_cmdbuf_man_idle(man, true),
 735                          timeout);
 736         }
 737         vmw_generic_waiter_remove(man->dev_priv,
 738                                   SVGA_IRQFLAG_COMMAND_BUFFER,
 739                                   &man->dev_priv->cmdbuf_waiters);
 740         if (ret == 0) {
 741                 if (!vmw_cmdbuf_man_idle(man, true))
 742                         ret = -EBUSY;
 743                 else
 744                         ret = 0;
 745         }
 746         if (ret > 0)
 747                 ret = 0;
 748 
 749         return ret;
 750 }
 751 
 752 /**
 753  * vmw_cmdbuf_try_alloc - Try to allocate buffer space from the main pool.
 754  *
 755  * @man: The command buffer manager.
 756  * @info: Allocation info. Will hold the size on entry and allocated mm node
 757  * on successful return.
 758  *
 759  * Try to allocate buffer space from the main pool. Returns true if succeeded.
 760  * If a fatal error was hit, the error code is returned in @info->ret.
 761  */
 762 static bool vmw_cmdbuf_try_alloc(struct vmw_cmdbuf_man *man,
 763                                  struct vmw_cmdbuf_alloc_info *info)
 764 {
 765         int ret;
 766 
 767         if (info->done)
 768                 return true;
 769 
 770         memset(info->node, 0, sizeof(*info->node));
 771         spin_lock(&man->lock);
 772         ret = drm_mm_insert_node(&man->mm, info->node, info->page_size);
 773         if (ret) {
 774                 vmw_cmdbuf_man_process(man);
 775                 ret = drm_mm_insert_node(&man->mm, info->node, info->page_size);
 776         }
 777 
 778         spin_unlock(&man->lock);
 779         info->done = !ret;
 780 
 781         return info->done;
 782 }
 783 
 784 /**
 785  * vmw_cmdbuf_alloc_space - Allocate buffer space from the main pool.
 786  *
 787  * @man: The command buffer manager.
 788  * @node: Pointer to pre-allocated range-manager node.
 789  * @size: The size of the allocation.
 790  * @interruptible: Whether to sleep interruptible while waiting for space.
 791  *
 792  * This function allocates buffer space from the main pool, and if there is
 793  * no space available ATM, it turns on IRQ handling and sleeps waiting for it to
 794  * become available.
 795  */
 796 static int vmw_cmdbuf_alloc_space(struct vmw_cmdbuf_man *man,
 797                                   struct drm_mm_node *node,
 798                                   size_t size,
 799                                   bool interruptible)
 800 {
 801         struct vmw_cmdbuf_alloc_info info;
 802 
 803         info.page_size = PAGE_ALIGN(size) >> PAGE_SHIFT;
 804         info.node = node;
 805         info.done = false;
 806 
 807         /*
 808          * To prevent starvation of large requests, only one allocating call
 809          * at a time waiting for space.
 810          */
 811         if (interruptible) {
 812                 if (mutex_lock_interruptible(&man->space_mutex))
 813                         return -ERESTARTSYS;
 814         } else {
 815                 mutex_lock(&man->space_mutex);
 816         }
 817 
 818         /* Try to allocate space without waiting. */
 819         if (vmw_cmdbuf_try_alloc(man, &info))
 820                 goto out_unlock;
 821 
 822         vmw_generic_waiter_add(man->dev_priv,
 823                                SVGA_IRQFLAG_COMMAND_BUFFER,
 824                                &man->dev_priv->cmdbuf_waiters);
 825 
 826         if (interruptible) {
 827                 int ret;
 828 
 829                 ret = wait_event_interruptible
 830                         (man->alloc_queue, vmw_cmdbuf_try_alloc(man, &info));
 831                 if (ret) {
 832                         vmw_generic_waiter_remove
 833                                 (man->dev_priv, SVGA_IRQFLAG_COMMAND_BUFFER,
 834                                  &man->dev_priv->cmdbuf_waiters);
 835                         mutex_unlock(&man->space_mutex);
 836                         return ret;
 837                 }
 838         } else {
 839                 wait_event(man->alloc_queue, vmw_cmdbuf_try_alloc(man, &info));
 840         }
 841         vmw_generic_waiter_remove(man->dev_priv,
 842                                   SVGA_IRQFLAG_COMMAND_BUFFER,
 843                                   &man->dev_priv->cmdbuf_waiters);
 844 
 845 out_unlock:
 846         mutex_unlock(&man->space_mutex);
 847 
 848         return 0;
 849 }
 850 
 851 /**
 852  * vmw_cmdbuf_space_pool - Set up a command buffer header with command buffer
 853  * space from the main pool.
 854  *
 855  * @man: The command buffer manager.
 856  * @header: Pointer to the header to set up.
 857  * @size: The requested size of the buffer space.
 858  * @interruptible: Whether to sleep interruptible while waiting for space.
 859  */
 860 static int vmw_cmdbuf_space_pool(struct vmw_cmdbuf_man *man,
 861                                  struct vmw_cmdbuf_header *header,
 862                                  size_t size,
 863                                  bool interruptible)
 864 {
 865         SVGACBHeader *cb_hdr;
 866         size_t offset;
 867         int ret;
 868 
 869         if (!man->has_pool)
 870                 return -ENOMEM;
 871 
 872         ret = vmw_cmdbuf_alloc_space(man, &header->node,  size, interruptible);
 873 
 874         if (ret)
 875                 return ret;
 876 
 877         header->cb_header = dma_pool_zalloc(man->headers, GFP_KERNEL,
 878                                             &header->handle);
 879         if (!header->cb_header) {
 880                 ret = -ENOMEM;
 881                 goto out_no_cb_header;
 882         }
 883 
 884         header->size = header->node.size << PAGE_SHIFT;
 885         cb_hdr = header->cb_header;
 886         offset = header->node.start << PAGE_SHIFT;
 887         header->cmd = man->map + offset;
 888         if (man->using_mob) {
 889                 cb_hdr->flags = SVGA_CB_FLAG_MOB;
 890                 cb_hdr->ptr.mob.mobid = man->cmd_space->mem.start;
 891                 cb_hdr->ptr.mob.mobOffset = offset;
 892         } else {
 893                 cb_hdr->ptr.pa = (u64)man->handle + (u64)offset;
 894         }
 895 
 896         return 0;
 897 
 898 out_no_cb_header:
 899         spin_lock(&man->lock);
 900         drm_mm_remove_node(&header->node);
 901         spin_unlock(&man->lock);
 902 
 903         return ret;
 904 }
 905 
 906 /**
 907  * vmw_cmdbuf_space_inline - Set up a command buffer header with
 908  * inline command buffer space.
 909  *
 910  * @man: The command buffer manager.
 911  * @header: Pointer to the header to set up.
 912  * @size: The requested size of the buffer space.
 913  */
 914 static int vmw_cmdbuf_space_inline(struct vmw_cmdbuf_man *man,
 915                                    struct vmw_cmdbuf_header *header,
 916                                    int size)
 917 {
 918         struct vmw_cmdbuf_dheader *dheader;
 919         SVGACBHeader *cb_hdr;
 920 
 921         if (WARN_ON_ONCE(size > VMW_CMDBUF_INLINE_SIZE))
 922                 return -ENOMEM;
 923 
 924         dheader = dma_pool_zalloc(man->dheaders, GFP_KERNEL,
 925                                   &header->handle);
 926         if (!dheader)
 927                 return -ENOMEM;
 928 
 929         header->inline_space = true;
 930         header->size = VMW_CMDBUF_INLINE_SIZE;
 931         cb_hdr = &dheader->cb_header;
 932         header->cb_header = cb_hdr;
 933         header->cmd = dheader->cmd;
 934         cb_hdr->status = SVGA_CB_STATUS_NONE;
 935         cb_hdr->flags = SVGA_CB_FLAG_NONE;
 936         cb_hdr->ptr.pa = (u64)header->handle +
 937                 (u64)offsetof(struct vmw_cmdbuf_dheader, cmd);
 938 
 939         return 0;
 940 }
 941 
 942 /**
 943  * vmw_cmdbuf_alloc - Allocate a command buffer header complete with
 944  * command buffer space.
 945  *
 946  * @man: The command buffer manager.
 947  * @size: The requested size of the buffer space.
 948  * @interruptible: Whether to sleep interruptible while waiting for space.
 949  * @p_header: points to a header pointer to populate on successful return.
 950  *
 951  * Returns a pointer to command buffer space if successful. Otherwise
 952  * returns an error pointer. The header pointer returned in @p_header should
 953  * be used for upcoming calls to vmw_cmdbuf_reserve() and vmw_cmdbuf_commit().
 954  */
 955 void *vmw_cmdbuf_alloc(struct vmw_cmdbuf_man *man,
 956                        size_t size, bool interruptible,
 957                        struct vmw_cmdbuf_header **p_header)
 958 {
 959         struct vmw_cmdbuf_header *header;
 960         int ret = 0;
 961 
 962         *p_header = NULL;
 963 
 964         header = kzalloc(sizeof(*header), GFP_KERNEL);
 965         if (!header)
 966                 return ERR_PTR(-ENOMEM);
 967 
 968         if (size <= VMW_CMDBUF_INLINE_SIZE)
 969                 ret = vmw_cmdbuf_space_inline(man, header, size);
 970         else
 971                 ret = vmw_cmdbuf_space_pool(man, header, size, interruptible);
 972 
 973         if (ret) {
 974                 kfree(header);
 975                 return ERR_PTR(ret);
 976         }
 977 
 978         header->man = man;
 979         INIT_LIST_HEAD(&header->list);
 980         header->cb_header->status = SVGA_CB_STATUS_NONE;
 981         *p_header = header;
 982 
 983         return header->cmd;
 984 }
 985 
 986 /**
 987  * vmw_cmdbuf_reserve_cur - Reserve space for commands in the current
 988  * command buffer.
 989  *
 990  * @man: The command buffer manager.
 991  * @size: The requested size of the commands.
 992  * @ctx_id: The context id if any. Otherwise set to SVGA3D_REG_INVALID.
 993  * @interruptible: Whether to sleep interruptible while waiting for space.
 994  *
 995  * Returns a pointer to command buffer space if successful. Otherwise
 996  * returns an error pointer.
 997  */
 998 static void *vmw_cmdbuf_reserve_cur(struct vmw_cmdbuf_man *man,
 999                                     size_t size,
1000                                     int ctx_id,
1001                                     bool interruptible)
1002 {
1003         struct vmw_cmdbuf_header *cur;
1004         void *ret;
1005 
1006         if (vmw_cmdbuf_cur_lock(man, interruptible))
1007                 return ERR_PTR(-ERESTARTSYS);
1008 
1009         cur = man->cur;
1010         if (cur && (size + man->cur_pos > cur->size ||
1011                     ((cur->cb_header->flags & SVGA_CB_FLAG_DX_CONTEXT) &&
1012                      ctx_id != cur->cb_header->dxContext)))
1013                 __vmw_cmdbuf_cur_flush(man);
1014 
1015         if (!man->cur) {
1016                 ret = vmw_cmdbuf_alloc(man,
1017                                        max_t(size_t, size, man->default_size),
1018                                        interruptible, &man->cur);
1019                 if (IS_ERR(ret)) {
1020                         vmw_cmdbuf_cur_unlock(man);
1021                         return ret;
1022                 }
1023 
1024                 cur = man->cur;
1025         }
1026 
1027         if (ctx_id != SVGA3D_INVALID_ID) {
1028                 cur->cb_header->flags |= SVGA_CB_FLAG_DX_CONTEXT;
1029                 cur->cb_header->dxContext = ctx_id;
1030         }
1031 
1032         cur->reserved = size;
1033 
1034         return (void *) (man->cur->cmd + man->cur_pos);
1035 }
1036 
1037 /**
1038  * vmw_cmdbuf_commit_cur - Commit commands in the current command buffer.
1039  *
1040  * @man: The command buffer manager.
1041  * @size: The size of the commands actually written.
1042  * @flush: Whether to flush the command buffer immediately.
1043  */
1044 static void vmw_cmdbuf_commit_cur(struct vmw_cmdbuf_man *man,
1045                                   size_t size, bool flush)
1046 {
1047         struct vmw_cmdbuf_header *cur = man->cur;
1048 
1049         lockdep_assert_held_once(&man->cur_mutex);
1050 
1051         WARN_ON(size > cur->reserved);
1052         man->cur_pos += size;
1053         if (!size)
1054                 cur->cb_header->flags &= ~SVGA_CB_FLAG_DX_CONTEXT;
1055         if (flush)
1056                 __vmw_cmdbuf_cur_flush(man);
1057         vmw_cmdbuf_cur_unlock(man);
1058 }
1059 
1060 /**
1061  * vmw_cmdbuf_reserve - Reserve space for commands in a command buffer.
1062  *
1063  * @man: The command buffer manager.
1064  * @size: The requested size of the commands.
1065  * @ctx_id: The context id if any. Otherwise set to SVGA3D_REG_INVALID.
1066  * @interruptible: Whether to sleep interruptible while waiting for space.
1067  * @header: Header of the command buffer. NULL if the current command buffer
1068  * should be used.
1069  *
1070  * Returns a pointer to command buffer space if successful. Otherwise
1071  * returns an error pointer.
1072  */
1073 void *vmw_cmdbuf_reserve(struct vmw_cmdbuf_man *man, size_t size,
1074                          int ctx_id, bool interruptible,
1075                          struct vmw_cmdbuf_header *header)
1076 {
1077         if (!header)
1078                 return vmw_cmdbuf_reserve_cur(man, size, ctx_id, interruptible);
1079 
1080         if (size > header->size)
1081                 return ERR_PTR(-EINVAL);
1082 
1083         if (ctx_id != SVGA3D_INVALID_ID) {
1084                 header->cb_header->flags |= SVGA_CB_FLAG_DX_CONTEXT;
1085                 header->cb_header->dxContext = ctx_id;
1086         }
1087 
1088         header->reserved = size;
1089         return header->cmd;
1090 }
1091 
1092 /**
1093  * vmw_cmdbuf_commit - Commit commands in a command buffer.
1094  *
1095  * @man: The command buffer manager.
1096  * @size: The size of the commands actually written.
1097  * @header: Header of the command buffer. NULL if the current command buffer
1098  * should be used.
1099  * @flush: Whether to flush the command buffer immediately.
1100  */
1101 void vmw_cmdbuf_commit(struct vmw_cmdbuf_man *man, size_t size,
1102                        struct vmw_cmdbuf_header *header, bool flush)
1103 {
1104         if (!header) {
1105                 vmw_cmdbuf_commit_cur(man, size, flush);
1106                 return;
1107         }
1108 
1109         (void) vmw_cmdbuf_cur_lock(man, false);
1110         __vmw_cmdbuf_cur_flush(man);
1111         WARN_ON(size > header->reserved);
1112         man->cur = header;
1113         man->cur_pos = size;
1114         if (!size)
1115                 header->cb_header->flags &= ~SVGA_CB_FLAG_DX_CONTEXT;
1116         if (flush)
1117                 __vmw_cmdbuf_cur_flush(man);
1118         vmw_cmdbuf_cur_unlock(man);
1119 }
1120 
1121 
1122 /**
1123  * vmw_cmdbuf_send_device_command - Send a command through the device context.
1124  *
1125  * @man: The command buffer manager.
1126  * @command: Pointer to the command to send.
1127  * @size: Size of the command.
1128  *
1129  * Synchronously sends a device context command.
1130  */
1131 static int vmw_cmdbuf_send_device_command(struct vmw_cmdbuf_man *man,
1132                                           const void *command,
1133                                           size_t size)
1134 {
1135         struct vmw_cmdbuf_header *header;
1136         int status;
1137         void *cmd = vmw_cmdbuf_alloc(man, size, false, &header);
1138 
1139         if (IS_ERR(cmd))
1140                 return PTR_ERR(cmd);
1141 
1142         memcpy(cmd, command, size);
1143         header->cb_header->length = size;
1144         header->cb_context = SVGA_CB_CONTEXT_DEVICE;
1145         spin_lock(&man->lock);
1146         status = vmw_cmdbuf_header_submit(header);
1147         spin_unlock(&man->lock);
1148         vmw_cmdbuf_header_free(header);
1149 
1150         if (status != SVGA_CB_STATUS_COMPLETED) {
1151                 DRM_ERROR("Device context command failed with status %d\n",
1152                           status);
1153                 return -EINVAL;
1154         }
1155 
1156         return 0;
1157 }
1158 
1159 /**
1160  * vmw_cmdbuf_preempt - Send a preempt command through the device
1161  * context.
1162  *
1163  * @man: The command buffer manager.
1164  *
1165  * Synchronously sends a preempt command.
1166  */
1167 static int vmw_cmdbuf_preempt(struct vmw_cmdbuf_man *man, u32 context)
1168 {
1169         struct {
1170                 uint32 id;
1171                 SVGADCCmdPreempt body;
1172         } __packed cmd;
1173 
1174         cmd.id = SVGA_DC_CMD_PREEMPT;
1175         cmd.body.context = SVGA_CB_CONTEXT_0 + context;
1176         cmd.body.ignoreIDZero = 0;
1177 
1178         return vmw_cmdbuf_send_device_command(man, &cmd, sizeof(cmd));
1179 }
1180 
1181 
1182 /**
1183  * vmw_cmdbuf_startstop - Send a start / stop command through the device
1184  * context.
1185  *
1186  * @man: The command buffer manager.
1187  * @enable: Whether to enable or disable the context.
1188  *
1189  * Synchronously sends a device start / stop context command.
1190  */
1191 static int vmw_cmdbuf_startstop(struct vmw_cmdbuf_man *man, u32 context,
1192                                 bool enable)
1193 {
1194         struct {
1195                 uint32 id;
1196                 SVGADCCmdStartStop body;
1197         } __packed cmd;
1198 
1199         cmd.id = SVGA_DC_CMD_START_STOP_CONTEXT;
1200         cmd.body.enable = (enable) ? 1 : 0;
1201         cmd.body.context = SVGA_CB_CONTEXT_0 + context;
1202 
1203         return vmw_cmdbuf_send_device_command(man, &cmd, sizeof(cmd));
1204 }
1205 
1206 /**
1207  * vmw_cmdbuf_set_pool_size - Set command buffer manager sizes
1208  *
1209  * @man: The command buffer manager.
1210  * @size: The size of the main space pool.
1211  * @default_size: The default size of the command buffer for small kernel
1212  * submissions.
1213  *
1214  * Set the size and allocate the main command buffer space pool,
1215  * as well as the default size of the command buffer for
1216  * small kernel submissions. If successful, this enables large command
1217  * submissions. Note that this function requires that rudimentary command
1218  * submission is already available and that the MOB memory manager is alive.
1219  * Returns 0 on success. Negative error code on failure.
1220  */
1221 int vmw_cmdbuf_set_pool_size(struct vmw_cmdbuf_man *man,
1222                              size_t size, size_t default_size)
1223 {
1224         struct vmw_private *dev_priv = man->dev_priv;
1225         bool dummy;
1226         int ret;
1227 
1228         if (man->has_pool)
1229                 return -EINVAL;
1230 
1231         /* First, try to allocate a huge chunk of DMA memory */
1232         size = PAGE_ALIGN(size);
1233         man->map = dma_alloc_coherent(&dev_priv->dev->pdev->dev, size,
1234                                       &man->handle, GFP_KERNEL);
1235         if (man->map) {
1236                 man->using_mob = false;
1237         } else {
1238                 /*
1239                  * DMA memory failed. If we can have command buffers in a
1240                  * MOB, try to use that instead. Note that this will
1241                  * actually call into the already enabled manager, when
1242                  * binding the MOB.
1243                  */
1244                 if (!(dev_priv->capabilities & SVGA_CAP_DX))
1245                         return -ENOMEM;
1246 
1247                 ret = ttm_bo_create(&dev_priv->bdev, size, ttm_bo_type_device,
1248                                     &vmw_mob_ne_placement, 0, false,
1249                                     &man->cmd_space);
1250                 if (ret)
1251                         return ret;
1252 
1253                 man->using_mob = true;
1254                 ret = ttm_bo_kmap(man->cmd_space, 0, size >> PAGE_SHIFT,
1255                                   &man->map_obj);
1256                 if (ret)
1257                         goto out_no_map;
1258 
1259                 man->map = ttm_kmap_obj_virtual(&man->map_obj, &dummy);
1260         }
1261 
1262         man->size = size;
1263         drm_mm_init(&man->mm, 0, size >> PAGE_SHIFT);
1264 
1265         man->has_pool = true;
1266 
1267         /*
1268          * For now, set the default size to VMW_CMDBUF_INLINE_SIZE to
1269          * prevent deadlocks from happening when vmw_cmdbuf_space_pool()
1270          * needs to wait for space and we block on further command
1271          * submissions to be able to free up space.
1272          */
1273         man->default_size = VMW_CMDBUF_INLINE_SIZE;
1274         DRM_INFO("Using command buffers with %s pool.\n",
1275                  (man->using_mob) ? "MOB" : "DMA");
1276 
1277         return 0;
1278 
1279 out_no_map:
1280         if (man->using_mob) {
1281                 ttm_bo_put(man->cmd_space);
1282                 man->cmd_space = NULL;
1283         }
1284 
1285         return ret;
1286 }
1287 
1288 /**
1289  * vmw_cmdbuf_man_create: Create a command buffer manager and enable it for
1290  * inline command buffer submissions only.
1291  *
1292  * @dev_priv: Pointer to device private structure.
1293  *
1294  * Returns a pointer to a cummand buffer manager to success or error pointer
1295  * on failure. The command buffer manager will be enabled for submissions of
1296  * size VMW_CMDBUF_INLINE_SIZE only.
1297  */
1298 struct vmw_cmdbuf_man *vmw_cmdbuf_man_create(struct vmw_private *dev_priv)
1299 {
1300         struct vmw_cmdbuf_man *man;
1301         struct vmw_cmdbuf_context *ctx;
1302         unsigned int i;
1303         int ret;
1304 
1305         if (!(dev_priv->capabilities & SVGA_CAP_COMMAND_BUFFERS))
1306                 return ERR_PTR(-ENOSYS);
1307 
1308         man = kzalloc(sizeof(*man), GFP_KERNEL);
1309         if (!man)
1310                 return ERR_PTR(-ENOMEM);
1311 
1312         man->num_contexts = (dev_priv->capabilities & SVGA_CAP_HP_CMD_QUEUE) ?
1313                 2 : 1;
1314         man->headers = dma_pool_create("vmwgfx cmdbuf",
1315                                        &dev_priv->dev->pdev->dev,
1316                                        sizeof(SVGACBHeader),
1317                                        64, PAGE_SIZE);
1318         if (!man->headers) {
1319                 ret = -ENOMEM;
1320                 goto out_no_pool;
1321         }
1322 
1323         man->dheaders = dma_pool_create("vmwgfx inline cmdbuf",
1324                                         &dev_priv->dev->pdev->dev,
1325                                         sizeof(struct vmw_cmdbuf_dheader),
1326                                         64, PAGE_SIZE);
1327         if (!man->dheaders) {
1328                 ret = -ENOMEM;
1329                 goto out_no_dpool;
1330         }
1331 
1332         for_each_cmdbuf_ctx(man, i, ctx)
1333                 vmw_cmdbuf_ctx_init(ctx);
1334 
1335         INIT_LIST_HEAD(&man->error);
1336         spin_lock_init(&man->lock);
1337         mutex_init(&man->cur_mutex);
1338         mutex_init(&man->space_mutex);
1339         mutex_init(&man->error_mutex);
1340         man->default_size = VMW_CMDBUF_INLINE_SIZE;
1341         init_waitqueue_head(&man->alloc_queue);
1342         init_waitqueue_head(&man->idle_queue);
1343         man->dev_priv = dev_priv;
1344         man->max_hw_submitted = SVGA_CB_MAX_QUEUED_PER_CONTEXT - 1;
1345         INIT_WORK(&man->work, &vmw_cmdbuf_work_func);
1346         vmw_generic_waiter_add(dev_priv, SVGA_IRQFLAG_ERROR,
1347                                &dev_priv->error_waiters);
1348         ret = vmw_cmdbuf_startstop(man, 0, true);
1349         if (ret) {
1350                 DRM_ERROR("Failed starting command buffer contexts\n");
1351                 vmw_cmdbuf_man_destroy(man);
1352                 return ERR_PTR(ret);
1353         }
1354 
1355         return man;
1356 
1357 out_no_dpool:
1358         dma_pool_destroy(man->headers);
1359 out_no_pool:
1360         kfree(man);
1361 
1362         return ERR_PTR(ret);
1363 }
1364 
1365 /**
1366  * vmw_cmdbuf_remove_pool - Take down the main buffer space pool.
1367  *
1368  * @man: Pointer to a command buffer manager.
1369  *
1370  * This function removes the main buffer space pool, and should be called
1371  * before MOB memory management is removed. When this function has been called,
1372  * only small command buffer submissions of size VMW_CMDBUF_INLINE_SIZE or
1373  * less are allowed, and the default size of the command buffer for small kernel
1374  * submissions is also set to this size.
1375  */
1376 void vmw_cmdbuf_remove_pool(struct vmw_cmdbuf_man *man)
1377 {
1378         if (!man->has_pool)
1379                 return;
1380 
1381         man->has_pool = false;
1382         man->default_size = VMW_CMDBUF_INLINE_SIZE;
1383         (void) vmw_cmdbuf_idle(man, false, 10*HZ);
1384         if (man->using_mob) {
1385                 (void) ttm_bo_kunmap(&man->map_obj);
1386                 ttm_bo_put(man->cmd_space);
1387                 man->cmd_space = NULL;
1388         } else {
1389                 dma_free_coherent(&man->dev_priv->dev->pdev->dev,
1390                                   man->size, man->map, man->handle);
1391         }
1392 }
1393 
1394 /**
1395  * vmw_cmdbuf_man_destroy - Take down a command buffer manager.
1396  *
1397  * @man: Pointer to a command buffer manager.
1398  *
1399  * This function idles and then destroys a command buffer manager.
1400  */
1401 void vmw_cmdbuf_man_destroy(struct vmw_cmdbuf_man *man)
1402 {
1403         WARN_ON_ONCE(man->has_pool);
1404         (void) vmw_cmdbuf_idle(man, false, 10*HZ);
1405 
1406         if (vmw_cmdbuf_startstop(man, 0, false))
1407                 DRM_ERROR("Failed stopping command buffer contexts.\n");
1408 
1409         vmw_generic_waiter_remove(man->dev_priv, SVGA_IRQFLAG_ERROR,
1410                                   &man->dev_priv->error_waiters);
1411         (void) cancel_work_sync(&man->work);
1412         dma_pool_destroy(man->dheaders);
1413         dma_pool_destroy(man->headers);
1414         mutex_destroy(&man->cur_mutex);
1415         mutex_destroy(&man->space_mutex);
1416         mutex_destroy(&man->error_mutex);
1417         kfree(man);
1418 }