drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c

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