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1// SPDX-License-Identifier: GPL-2.0 OR MIT
2/**************************************************************************
3 *
4 * Copyright 2015-2023 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 "vmwgfx_bo.h"
29#include "vmwgfx_drv.h"
30
31#include <drm/ttm/ttm_bo.h>
32
33#include <linux/dmapool.h>
34#include <linux/pci.h>
35
36/*
37 * Size of inline command buffers. Try to make sure that a page size is a
38 * multiple of the DMA pool allocation size.
39 */
40#define VMW_CMDBUF_INLINE_ALIGN 64
41#define VMW_CMDBUF_INLINE_SIZE \
42 (1024 - ALIGN(sizeof(SVGACBHeader), VMW_CMDBUF_INLINE_ALIGN))
43
44/**
45 * struct vmw_cmdbuf_context - Command buffer context queues
46 *
47 * @submitted: List of command buffers that have been submitted to the
48 * manager but not yet submitted to hardware.
49 * @hw_submitted: List of command buffers submitted to hardware.
50 * @preempted: List of preempted command buffers.
51 * @num_hw_submitted: Number of buffers currently being processed by hardware
52 * @block_submission: Identifies a block command submission.
53 */
54struct vmw_cmdbuf_context {
55 struct list_head submitted;
56 struct list_head hw_submitted;
57 struct list_head preempted;
58 unsigned num_hw_submitted;
59 bool block_submission;
60};
61
62/**
63 * struct vmw_cmdbuf_man - Command buffer manager
64 *
65 * @cur_mutex: Mutex protecting the command buffer used for incremental small
66 * kernel command submissions, @cur.
67 * @space_mutex: Mutex to protect against starvation when we allocate
68 * main pool buffer space.
69 * @error_mutex: Mutex to serialize the work queue error handling.
70 * Note this is not needed if the same workqueue handler
71 * can't race with itself...
72 * @work: A struct work_struct implementeing command buffer error handling.
73 * Immutable.
74 * @dev_priv: Pointer to the device private struct. Immutable.
75 * @ctx: Array of command buffer context queues. The queues and the context
76 * data is protected by @lock.
77 * @error: List of command buffers that have caused device errors.
78 * Protected by @lock.
79 * @mm: Range manager for the command buffer space. Manager allocations and
80 * frees are protected by @lock.
81 * @cmd_space: Buffer object for the command buffer space, unless we were
82 * able to make a contigous coherent DMA memory allocation, @handle. Immutable.
83 * @map: Pointer to command buffer space. May be a mapped buffer object or
84 * a contigous coherent DMA memory allocation. Immutable.
85 * @cur: Command buffer for small kernel command submissions. Protected by
86 * the @cur_mutex.
87 * @cur_pos: Space already used in @cur. Protected by @cur_mutex.
88 * @default_size: Default size for the @cur command buffer. Immutable.
89 * @max_hw_submitted: Max number of in-flight command buffers the device can
90 * handle. Immutable.
91 * @lock: Spinlock protecting command submission queues.
92 * @headers: Pool of DMA memory for device command buffer headers.
93 * Internal protection.
94 * @dheaders: Pool of DMA memory for device command buffer headers with trailing
95 * space for inline data. Internal protection.
96 * @alloc_queue: Wait queue for processes waiting to allocate command buffer
97 * space.
98 * @idle_queue: Wait queue for processes waiting for command buffer idle.
99 * @irq_on: Whether the process function has requested irq to be turned on.
100 * Protected by @lock.
101 * @using_mob: Whether the command buffer space is a MOB or a contigous DMA
102 * allocation. Immutable.
103 * @has_pool: Has a large pool of DMA memory which allows larger allocations.
104 * Typically this is false only during bootstrap.
105 * @handle: DMA address handle for the command buffer space if @using_mob is
106 * false. Immutable.
107 * @size: The size of the command buffer space. Immutable.
108 * @num_contexts: Number of contexts actually enabled.
109 */
110struct vmw_cmdbuf_man {
111 struct mutex cur_mutex;
112 struct mutex space_mutex;
113 struct mutex error_mutex;
114 struct work_struct work;
115 struct vmw_private *dev_priv;
116 struct vmw_cmdbuf_context ctx[SVGA_CB_CONTEXT_MAX];
117 struct list_head error;
118 struct drm_mm mm;
119 struct vmw_bo *cmd_space;
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 */
153struct 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 */
173struct 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 */
185struct 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
196static int vmw_cmdbuf_startstop(struct vmw_cmdbuf_man *man, u32 context,
197 bool enable);
198static 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 */
206static 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 */
223static 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 */
235static 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 */
256static 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 */
281void 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_cmdbuf_header_submit: Submit a command buffer to hardware.
298 *
299 * @header: The header of the buffer to submit.
300 */
301static 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 */
321static 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 */
339static 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_move_tail(&entry->list, &ctx->hw_submitted);
361 ctx->num_hw_submitted++;
362 }
363
364}
365
366/**
367 * vmw_cmdbuf_ctx_process - Process a command buffer context.
368 *
369 * @man: The command buffer manager.
370 * @ctx: The command buffer context.
371 * @notempty: Pass back count of non-empty command submitted lists.
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 */
377static 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 */
434static void vmw_cmdbuf_man_process(struct vmw_cmdbuf_man *man)
435{
436 int notempty;
437 struct vmw_cmdbuf_context *ctx;
438 int i;
439
440retry:
441 notempty = 0;
442 for_each_cmdbuf_ctx(man, i, ctx)
443 vmw_cmdbuf_ctx_process(man, ctx, ¬empty);
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 */
474static 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 */
496void 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 */
512static 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 = 0;
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_cmd_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 */
627static 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
645out_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 */
660static 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);
677out_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 */
693int 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 */
718int 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 */
762static 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 */
796static 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 = PFN_UP(size);
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
845out_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 */
860static 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->tbo.resource->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
898out_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 */
914static 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 */
955void *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 */
998static 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 */
1044static 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 */
1073void *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 */
1101void 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 */
1131static 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 * @context: Device context to pass command through.
1165 *
1166 * Synchronously sends a preempt command.
1167 */
1168static int vmw_cmdbuf_preempt(struct vmw_cmdbuf_man *man, u32 context)
1169{
1170 struct {
1171 uint32 id;
1172 SVGADCCmdPreempt body;
1173 } __packed cmd;
1174
1175 cmd.id = SVGA_DC_CMD_PREEMPT;
1176 cmd.body.context = SVGA_CB_CONTEXT_0 + context;
1177 cmd.body.ignoreIDZero = 0;
1178
1179 return vmw_cmdbuf_send_device_command(man, &cmd, sizeof(cmd));
1180}
1181
1182
1183/**
1184 * vmw_cmdbuf_startstop - Send a start / stop command through the device
1185 * context.
1186 *
1187 * @man: The command buffer manager.
1188 * @context: Device context to start/stop.
1189 * @enable: Whether to enable or disable the context.
1190 *
1191 * Synchronously sends a device start / stop context command.
1192 */
1193static int vmw_cmdbuf_startstop(struct vmw_cmdbuf_man *man, u32 context,
1194 bool enable)
1195{
1196 struct {
1197 uint32 id;
1198 SVGADCCmdStartStop body;
1199 } __packed cmd;
1200
1201 cmd.id = SVGA_DC_CMD_START_STOP_CONTEXT;
1202 cmd.body.enable = (enable) ? 1 : 0;
1203 cmd.body.context = SVGA_CB_CONTEXT_0 + context;
1204
1205 return vmw_cmdbuf_send_device_command(man, &cmd, sizeof(cmd));
1206}
1207
1208/**
1209 * vmw_cmdbuf_set_pool_size - Set command buffer manager sizes
1210 *
1211 * @man: The command buffer manager.
1212 * @size: The size of the main space pool.
1213 *
1214 * Set the size and allocate the main command buffer space pool.
1215 * If successful, this enables large command submissions.
1216 * Note that this function requires that rudimentary command
1217 * submission is already available and that the MOB memory manager is alive.
1218 * Returns 0 on success. Negative error code on failure.
1219 */
1220int vmw_cmdbuf_set_pool_size(struct vmw_cmdbuf_man *man, size_t size)
1221{
1222 struct vmw_private *dev_priv = man->dev_priv;
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->drm.dev, size,
1231 &man->handle, GFP_KERNEL);
1232 if (man->map) {
1233 man->using_mob = false;
1234 } else {
1235 struct vmw_bo_params bo_params = {
1236 .domain = VMW_BO_DOMAIN_MOB,
1237 .busy_domain = VMW_BO_DOMAIN_MOB,
1238 .bo_type = ttm_bo_type_kernel,
1239 .size = size,
1240 .pin = true
1241 };
1242 /*
1243 * DMA memory failed. If we can have command buffers in a
1244 * MOB, try to use that instead. Note that this will
1245 * actually call into the already enabled manager, when
1246 * binding the MOB.
1247 */
1248 if (!(dev_priv->capabilities & SVGA_CAP_DX) ||
1249 !dev_priv->has_mob)
1250 return -ENOMEM;
1251
1252 ret = vmw_bo_create(dev_priv, &bo_params, &man->cmd_space);
1253 if (ret)
1254 return ret;
1255
1256 man->map = vmw_bo_map_and_cache(man->cmd_space);
1257 man->using_mob = man->map;
1258 }
1259
1260 man->size = size;
1261 drm_mm_init(&man->mm, 0, size >> PAGE_SHIFT);
1262
1263 man->has_pool = true;
1264
1265 /*
1266 * For now, set the default size to VMW_CMDBUF_INLINE_SIZE to
1267 * prevent deadlocks from happening when vmw_cmdbuf_space_pool()
1268 * needs to wait for space and we block on further command
1269 * submissions to be able to free up space.
1270 */
1271 man->default_size = VMW_CMDBUF_INLINE_SIZE;
1272 drm_info(&dev_priv->drm,
1273 "Using command buffers with %s pool.\n",
1274 (man->using_mob) ? "MOB" : "DMA");
1275
1276 return 0;
1277}
1278
1279/**
1280 * vmw_cmdbuf_man_create: Create a command buffer manager and enable it for
1281 * inline command buffer submissions only.
1282 *
1283 * @dev_priv: Pointer to device private structure.
1284 *
1285 * Returns a pointer to a cummand buffer manager to success or error pointer
1286 * on failure. The command buffer manager will be enabled for submissions of
1287 * size VMW_CMDBUF_INLINE_SIZE only.
1288 */
1289struct vmw_cmdbuf_man *vmw_cmdbuf_man_create(struct vmw_private *dev_priv)
1290{
1291 struct vmw_cmdbuf_man *man;
1292 struct vmw_cmdbuf_context *ctx;
1293 unsigned int i;
1294 int ret;
1295
1296 if (!(dev_priv->capabilities & SVGA_CAP_COMMAND_BUFFERS))
1297 return ERR_PTR(-ENOSYS);
1298
1299 man = kzalloc(sizeof(*man), GFP_KERNEL);
1300 if (!man)
1301 return ERR_PTR(-ENOMEM);
1302
1303 man->num_contexts = (dev_priv->capabilities & SVGA_CAP_HP_CMD_QUEUE) ?
1304 2 : 1;
1305 man->headers = dma_pool_create("vmwgfx cmdbuf",
1306 dev_priv->drm.dev,
1307 sizeof(SVGACBHeader),
1308 64, PAGE_SIZE);
1309 if (!man->headers) {
1310 ret = -ENOMEM;
1311 goto out_no_pool;
1312 }
1313
1314 man->dheaders = dma_pool_create("vmwgfx inline cmdbuf",
1315 dev_priv->drm.dev,
1316 sizeof(struct vmw_cmdbuf_dheader),
1317 64, PAGE_SIZE);
1318 if (!man->dheaders) {
1319 ret = -ENOMEM;
1320 goto out_no_dpool;
1321 }
1322
1323 for_each_cmdbuf_ctx(man, i, ctx)
1324 vmw_cmdbuf_ctx_init(ctx);
1325
1326 INIT_LIST_HEAD(&man->error);
1327 spin_lock_init(&man->lock);
1328 mutex_init(&man->cur_mutex);
1329 mutex_init(&man->space_mutex);
1330 mutex_init(&man->error_mutex);
1331 man->default_size = VMW_CMDBUF_INLINE_SIZE;
1332 init_waitqueue_head(&man->alloc_queue);
1333 init_waitqueue_head(&man->idle_queue);
1334 man->dev_priv = dev_priv;
1335 man->max_hw_submitted = SVGA_CB_MAX_QUEUED_PER_CONTEXT - 1;
1336 INIT_WORK(&man->work, &vmw_cmdbuf_work_func);
1337 vmw_generic_waiter_add(dev_priv, SVGA_IRQFLAG_ERROR,
1338 &dev_priv->error_waiters);
1339 ret = vmw_cmdbuf_startstop(man, 0, true);
1340 if (ret) {
1341 DRM_ERROR("Failed starting command buffer contexts\n");
1342 vmw_cmdbuf_man_destroy(man);
1343 return ERR_PTR(ret);
1344 }
1345
1346 return man;
1347
1348out_no_dpool:
1349 dma_pool_destroy(man->headers);
1350out_no_pool:
1351 kfree(man);
1352
1353 return ERR_PTR(ret);
1354}
1355
1356/**
1357 * vmw_cmdbuf_remove_pool - Take down the main buffer space pool.
1358 *
1359 * @man: Pointer to a command buffer manager.
1360 *
1361 * This function removes the main buffer space pool, and should be called
1362 * before MOB memory management is removed. When this function has been called,
1363 * only small command buffer submissions of size VMW_CMDBUF_INLINE_SIZE or
1364 * less are allowed, and the default size of the command buffer for small kernel
1365 * submissions is also set to this size.
1366 */
1367void vmw_cmdbuf_remove_pool(struct vmw_cmdbuf_man *man)
1368{
1369 if (!man->has_pool)
1370 return;
1371
1372 man->has_pool = false;
1373 man->default_size = VMW_CMDBUF_INLINE_SIZE;
1374 (void) vmw_cmdbuf_idle(man, false, 10*HZ);
1375 if (man->using_mob)
1376 vmw_bo_unreference(&man->cmd_space);
1377 else
1378 dma_free_coherent(man->dev_priv->drm.dev,
1379 man->size, man->map, man->handle);
1380}
1381
1382/**
1383 * vmw_cmdbuf_man_destroy - Take down a command buffer manager.
1384 *
1385 * @man: Pointer to a command buffer manager.
1386 *
1387 * This function idles and then destroys a command buffer manager.
1388 */
1389void vmw_cmdbuf_man_destroy(struct vmw_cmdbuf_man *man)
1390{
1391 WARN_ON_ONCE(man->has_pool);
1392 (void) vmw_cmdbuf_idle(man, false, 10*HZ);
1393
1394 if (vmw_cmdbuf_startstop(man, 0, false))
1395 DRM_ERROR("Failed stopping command buffer contexts.\n");
1396
1397 vmw_generic_waiter_remove(man->dev_priv, SVGA_IRQFLAG_ERROR,
1398 &man->dev_priv->error_waiters);
1399 (void) cancel_work_sync(&man->work);
1400 dma_pool_destroy(man->dheaders);
1401 dma_pool_destroy(man->headers);
1402 mutex_destroy(&man->cur_mutex);
1403 mutex_destroy(&man->space_mutex);
1404 mutex_destroy(&man->error_mutex);
1405 kfree(man);
1406}
1/**************************************************************************
2 *
3 * Copyright © 2015 VMware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
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 "vmwgfx_drv.h"
29#include "ttm/ttm_bo_api.h"
30
31/*
32 * Size of inline command buffers. Try to make sure that a page size is a
33 * multiple of the DMA pool allocation size.
34 */
35#define VMW_CMDBUF_INLINE_ALIGN 64
36#define VMW_CMDBUF_INLINE_SIZE \
37 (1024 - ALIGN(sizeof(SVGACBHeader), VMW_CMDBUF_INLINE_ALIGN))
38
39/**
40 * struct vmw_cmdbuf_context - Command buffer context queues
41 *
42 * @submitted: List of command buffers that have been submitted to the
43 * manager but not yet submitted to hardware.
44 * @hw_submitted: List of command buffers submitted to hardware.
45 * @preempted: List of preempted command buffers.
46 * @num_hw_submitted: Number of buffers currently being processed by hardware
47 */
48struct vmw_cmdbuf_context {
49 struct list_head submitted;
50 struct list_head hw_submitted;
51 struct list_head preempted;
52 unsigned num_hw_submitted;
53};
54
55/**
56 * struct vmw_cmdbuf_man: - Command buffer manager
57 *
58 * @cur_mutex: Mutex protecting the command buffer used for incremental small
59 * kernel command submissions, @cur.
60 * @space_mutex: Mutex to protect against starvation when we allocate
61 * main pool buffer space.
62 * @work: A struct work_struct implementeing command buffer error handling.
63 * Immutable.
64 * @dev_priv: Pointer to the device private struct. Immutable.
65 * @ctx: Array of command buffer context queues. The queues and the context
66 * data is protected by @lock.
67 * @error: List of command buffers that have caused device errors.
68 * Protected by @lock.
69 * @mm: Range manager for the command buffer space. Manager allocations and
70 * frees are protected by @lock.
71 * @cmd_space: Buffer object for the command buffer space, unless we were
72 * able to make a contigous coherent DMA memory allocation, @handle. Immutable.
73 * @map_obj: Mapping state for @cmd_space. Immutable.
74 * @map: Pointer to command buffer space. May be a mapped buffer object or
75 * a contigous coherent DMA memory allocation. Immutable.
76 * @cur: Command buffer for small kernel command submissions. Protected by
77 * the @cur_mutex.
78 * @cur_pos: Space already used in @cur. Protected by @cur_mutex.
79 * @default_size: Default size for the @cur command buffer. Immutable.
80 * @max_hw_submitted: Max number of in-flight command buffers the device can
81 * handle. Immutable.
82 * @lock: Spinlock protecting command submission queues.
83 * @header: Pool of DMA memory for device command buffer headers.
84 * Internal protection.
85 * @dheaders: Pool of DMA memory for device command buffer headers with trailing
86 * space for inline data. Internal protection.
87 * @tasklet: Tasklet struct for irq processing. Immutable.
88 * @alloc_queue: Wait queue for processes waiting to allocate command buffer
89 * space.
90 * @idle_queue: Wait queue for processes waiting for command buffer idle.
91 * @irq_on: Whether the process function has requested irq to be turned on.
92 * Protected by @lock.
93 * @using_mob: Whether the command buffer space is a MOB or a contigous DMA
94 * allocation. Immutable.
95 * @has_pool: Has a large pool of DMA memory which allows larger allocations.
96 * Typically this is false only during bootstrap.
97 * @handle: DMA address handle for the command buffer space if @using_mob is
98 * false. Immutable.
99 * @size: The size of the command buffer space. Immutable.
100 */
101struct vmw_cmdbuf_man {
102 struct mutex cur_mutex;
103 struct mutex space_mutex;
104 struct work_struct work;
105 struct vmw_private *dev_priv;
106 struct vmw_cmdbuf_context ctx[SVGA_CB_CONTEXT_MAX];
107 struct list_head error;
108 struct drm_mm mm;
109 struct ttm_buffer_object *cmd_space;
110 struct ttm_bo_kmap_obj map_obj;
111 u8 *map;
112 struct vmw_cmdbuf_header *cur;
113 size_t cur_pos;
114 size_t default_size;
115 unsigned max_hw_submitted;
116 spinlock_t lock;
117 struct dma_pool *headers;
118 struct dma_pool *dheaders;
119 struct tasklet_struct tasklet;
120 wait_queue_head_t alloc_queue;
121 wait_queue_head_t idle_queue;
122 bool irq_on;
123 bool using_mob;
124 bool has_pool;
125 dma_addr_t handle;
126 size_t size;
127};
128
129/**
130 * struct vmw_cmdbuf_header - Command buffer metadata
131 *
132 * @man: The command buffer manager.
133 * @cb_header: Device command buffer header, allocated from a DMA pool.
134 * @cb_context: The device command buffer context.
135 * @list: List head for attaching to the manager lists.
136 * @node: The range manager node.
137 * @handle. The DMA address of @cb_header. Handed to the device on command
138 * buffer submission.
139 * @cmd: Pointer to the command buffer space of this buffer.
140 * @size: Size of the command buffer space of this buffer.
141 * @reserved: Reserved space of this buffer.
142 * @inline_space: Whether inline command buffer space is used.
143 */
144struct vmw_cmdbuf_header {
145 struct vmw_cmdbuf_man *man;
146 SVGACBHeader *cb_header;
147 SVGACBContext cb_context;
148 struct list_head list;
149 struct drm_mm_node node;
150 dma_addr_t handle;
151 u8 *cmd;
152 size_t size;
153 size_t reserved;
154 bool inline_space;
155};
156
157/**
158 * struct vmw_cmdbuf_dheader - Device command buffer header with inline
159 * command buffer space.
160 *
161 * @cb_header: Device command buffer header.
162 * @cmd: Inline command buffer space.
163 */
164struct vmw_cmdbuf_dheader {
165 SVGACBHeader cb_header;
166 u8 cmd[VMW_CMDBUF_INLINE_SIZE] __aligned(VMW_CMDBUF_INLINE_ALIGN);
167};
168
169/**
170 * struct vmw_cmdbuf_alloc_info - Command buffer space allocation metadata
171 *
172 * @page_size: Size of requested command buffer space in pages.
173 * @node: Pointer to the range manager node.
174 * @done: True if this allocation has succeeded.
175 */
176struct vmw_cmdbuf_alloc_info {
177 size_t page_size;
178 struct drm_mm_node *node;
179 bool done;
180};
181
182/* Loop over each context in the command buffer manager. */
183#define for_each_cmdbuf_ctx(_man, _i, _ctx) \
184 for (_i = 0, _ctx = &(_man)->ctx[0]; (_i) < SVGA_CB_CONTEXT_MAX; \
185 ++(_i), ++(_ctx))
186
187static int vmw_cmdbuf_startstop(struct vmw_cmdbuf_man *man, bool enable);
188
189
190/**
191 * vmw_cmdbuf_cur_lock - Helper to lock the cur_mutex.
192 *
193 * @man: The range manager.
194 * @interruptible: Whether to wait interruptible when locking.
195 */
196static int vmw_cmdbuf_cur_lock(struct vmw_cmdbuf_man *man, bool interruptible)
197{
198 if (interruptible) {
199 if (mutex_lock_interruptible(&man->cur_mutex))
200 return -ERESTARTSYS;
201 } else {
202 mutex_lock(&man->cur_mutex);
203 }
204
205 return 0;
206}
207
208/**
209 * vmw_cmdbuf_cur_unlock - Helper to unlock the cur_mutex.
210 *
211 * @man: The range manager.
212 */
213static void vmw_cmdbuf_cur_unlock(struct vmw_cmdbuf_man *man)
214{
215 mutex_unlock(&man->cur_mutex);
216}
217
218/**
219 * vmw_cmdbuf_header_inline_free - Free a struct vmw_cmdbuf_header that has
220 * been used for the device context with inline command buffers.
221 * Need not be called locked.
222 *
223 * @header: Pointer to the header to free.
224 */
225static void vmw_cmdbuf_header_inline_free(struct vmw_cmdbuf_header *header)
226{
227 struct vmw_cmdbuf_dheader *dheader;
228
229 if (WARN_ON_ONCE(!header->inline_space))
230 return;
231
232 dheader = container_of(header->cb_header, struct vmw_cmdbuf_dheader,
233 cb_header);
234 dma_pool_free(header->man->dheaders, dheader, header->handle);
235 kfree(header);
236}
237
238/**
239 * __vmw_cmdbuf_header_free - Free a struct vmw_cmdbuf_header and its
240 * associated structures.
241 *
242 * header: Pointer to the header to free.
243 *
244 * For internal use. Must be called with man::lock held.
245 */
246static void __vmw_cmdbuf_header_free(struct vmw_cmdbuf_header *header)
247{
248 struct vmw_cmdbuf_man *man = header->man;
249
250 lockdep_assert_held_once(&man->lock);
251
252 if (header->inline_space) {
253 vmw_cmdbuf_header_inline_free(header);
254 return;
255 }
256
257 drm_mm_remove_node(&header->node);
258 wake_up_all(&man->alloc_queue);
259 if (header->cb_header)
260 dma_pool_free(man->headers, header->cb_header,
261 header->handle);
262 kfree(header);
263}
264
265/**
266 * vmw_cmdbuf_header_free - Free a struct vmw_cmdbuf_header and its
267 * associated structures.
268 *
269 * @header: Pointer to the header to free.
270 */
271void vmw_cmdbuf_header_free(struct vmw_cmdbuf_header *header)
272{
273 struct vmw_cmdbuf_man *man = header->man;
274
275 /* Avoid locking if inline_space */
276 if (header->inline_space) {
277 vmw_cmdbuf_header_inline_free(header);
278 return;
279 }
280 spin_lock_bh(&man->lock);
281 __vmw_cmdbuf_header_free(header);
282 spin_unlock_bh(&man->lock);
283}
284
285
286/**
287 * vmw_cmbuf_header_submit: Submit a command buffer to hardware.
288 *
289 * @header: The header of the buffer to submit.
290 */
291static int vmw_cmdbuf_header_submit(struct vmw_cmdbuf_header *header)
292{
293 struct vmw_cmdbuf_man *man = header->man;
294 u32 val;
295
296 val = upper_32_bits(header->handle);
297 vmw_write(man->dev_priv, SVGA_REG_COMMAND_HIGH, val);
298
299 val = lower_32_bits(header->handle);
300 val |= header->cb_context & SVGA_CB_CONTEXT_MASK;
301 vmw_write(man->dev_priv, SVGA_REG_COMMAND_LOW, val);
302
303 return header->cb_header->status;
304}
305
306/**
307 * vmw_cmdbuf_ctx_init: Initialize a command buffer context.
308 *
309 * @ctx: The command buffer context to initialize
310 */
311static void vmw_cmdbuf_ctx_init(struct vmw_cmdbuf_context *ctx)
312{
313 INIT_LIST_HEAD(&ctx->hw_submitted);
314 INIT_LIST_HEAD(&ctx->submitted);
315 INIT_LIST_HEAD(&ctx->preempted);
316 ctx->num_hw_submitted = 0;
317}
318
319/**
320 * vmw_cmdbuf_ctx_submit: Submit command buffers from a command buffer
321 * context.
322 *
323 * @man: The command buffer manager.
324 * @ctx: The command buffer context.
325 *
326 * Submits command buffers to hardware until there are no more command
327 * buffers to submit or the hardware can't handle more command buffers.
328 */
329static void vmw_cmdbuf_ctx_submit(struct vmw_cmdbuf_man *man,
330 struct vmw_cmdbuf_context *ctx)
331{
332 while (ctx->num_hw_submitted < man->max_hw_submitted &&
333 !list_empty(&ctx->submitted)) {
334 struct vmw_cmdbuf_header *entry;
335 SVGACBStatus status;
336
337 entry = list_first_entry(&ctx->submitted,
338 struct vmw_cmdbuf_header,
339 list);
340
341 status = vmw_cmdbuf_header_submit(entry);
342
343 /* This should never happen */
344 if (WARN_ON_ONCE(status == SVGA_CB_STATUS_QUEUE_FULL)) {
345 entry->cb_header->status = SVGA_CB_STATUS_NONE;
346 break;
347 }
348
349 list_del(&entry->list);
350 list_add_tail(&entry->list, &ctx->hw_submitted);
351 ctx->num_hw_submitted++;
352 }
353
354}
355
356/**
357 * vmw_cmdbuf_ctx_submit: Process a command buffer context.
358 *
359 * @man: The command buffer manager.
360 * @ctx: The command buffer context.
361 *
362 * Submit command buffers to hardware if possible, and process finished
363 * buffers. Typically freeing them, but on preemption or error take
364 * appropriate action. Wake up waiters if appropriate.
365 */
366static void vmw_cmdbuf_ctx_process(struct vmw_cmdbuf_man *man,
367 struct vmw_cmdbuf_context *ctx,
368 int *notempty)
369{
370 struct vmw_cmdbuf_header *entry, *next;
371
372 vmw_cmdbuf_ctx_submit(man, ctx);
373
374 list_for_each_entry_safe(entry, next, &ctx->hw_submitted, list) {
375 SVGACBStatus status = entry->cb_header->status;
376
377 if (status == SVGA_CB_STATUS_NONE)
378 break;
379
380 list_del(&entry->list);
381 wake_up_all(&man->idle_queue);
382 ctx->num_hw_submitted--;
383 switch (status) {
384 case SVGA_CB_STATUS_COMPLETED:
385 __vmw_cmdbuf_header_free(entry);
386 break;
387 case SVGA_CB_STATUS_COMMAND_ERROR:
388 case SVGA_CB_STATUS_CB_HEADER_ERROR:
389 list_add_tail(&entry->list, &man->error);
390 schedule_work(&man->work);
391 break;
392 case SVGA_CB_STATUS_PREEMPTED:
393 list_add(&entry->list, &ctx->preempted);
394 break;
395 default:
396 WARN_ONCE(true, "Undefined command buffer status.\n");
397 __vmw_cmdbuf_header_free(entry);
398 break;
399 }
400 }
401
402 vmw_cmdbuf_ctx_submit(man, ctx);
403 if (!list_empty(&ctx->submitted))
404 (*notempty)++;
405}
406
407/**
408 * vmw_cmdbuf_man_process - Process all command buffer contexts and
409 * switch on and off irqs as appropriate.
410 *
411 * @man: The command buffer manager.
412 *
413 * Calls vmw_cmdbuf_ctx_process() on all contexts. If any context has
414 * command buffers left that are not submitted to hardware, Make sure
415 * IRQ handling is turned on. Otherwise, make sure it's turned off.
416 */
417static void vmw_cmdbuf_man_process(struct vmw_cmdbuf_man *man)
418{
419 int notempty;
420 struct vmw_cmdbuf_context *ctx;
421 int i;
422
423retry:
424 notempty = 0;
425 for_each_cmdbuf_ctx(man, i, ctx)
426 vmw_cmdbuf_ctx_process(man, ctx, ¬empty);
427
428 if (man->irq_on && !notempty) {
429 vmw_generic_waiter_remove(man->dev_priv,
430 SVGA_IRQFLAG_COMMAND_BUFFER,
431 &man->dev_priv->cmdbuf_waiters);
432 man->irq_on = false;
433 } else if (!man->irq_on && notempty) {
434 vmw_generic_waiter_add(man->dev_priv,
435 SVGA_IRQFLAG_COMMAND_BUFFER,
436 &man->dev_priv->cmdbuf_waiters);
437 man->irq_on = true;
438
439 /* Rerun in case we just missed an irq. */
440 goto retry;
441 }
442}
443
444/**
445 * vmw_cmdbuf_ctx_add - Schedule a command buffer for submission on a
446 * command buffer context
447 *
448 * @man: The command buffer manager.
449 * @header: The header of the buffer to submit.
450 * @cb_context: The command buffer context to use.
451 *
452 * This function adds @header to the "submitted" queue of the command
453 * buffer context identified by @cb_context. It then calls the command buffer
454 * manager processing to potentially submit the buffer to hardware.
455 * @man->lock needs to be held when calling this function.
456 */
457static void vmw_cmdbuf_ctx_add(struct vmw_cmdbuf_man *man,
458 struct vmw_cmdbuf_header *header,
459 SVGACBContext cb_context)
460{
461 if (!(header->cb_header->flags & SVGA_CB_FLAG_DX_CONTEXT))
462 header->cb_header->dxContext = 0;
463 header->cb_context = cb_context;
464 list_add_tail(&header->list, &man->ctx[cb_context].submitted);
465
466 vmw_cmdbuf_man_process(man);
467}
468
469/**
470 * vmw_cmdbuf_man_tasklet - The main part of the command buffer interrupt
471 * handler implemented as a tasklet.
472 *
473 * @data: Tasklet closure. A pointer to the command buffer manager cast to
474 * an unsigned long.
475 *
476 * The bottom half (tasklet) of the interrupt handler simply calls into the
477 * command buffer processor to free finished buffers and submit any
478 * queued buffers to hardware.
479 */
480static void vmw_cmdbuf_man_tasklet(unsigned long data)
481{
482 struct vmw_cmdbuf_man *man = (struct vmw_cmdbuf_man *) data;
483
484 spin_lock(&man->lock);
485 vmw_cmdbuf_man_process(man);
486 spin_unlock(&man->lock);
487}
488
489/**
490 * vmw_cmdbuf_work_func - The deferred work function that handles
491 * command buffer errors.
492 *
493 * @work: The work func closure argument.
494 *
495 * Restarting the command buffer context after an error requires process
496 * context, so it is deferred to this work function.
497 */
498static void vmw_cmdbuf_work_func(struct work_struct *work)
499{
500 struct vmw_cmdbuf_man *man =
501 container_of(work, struct vmw_cmdbuf_man, work);
502 struct vmw_cmdbuf_header *entry, *next;
503 uint32_t dummy;
504 bool restart = false;
505
506 spin_lock_bh(&man->lock);
507 list_for_each_entry_safe(entry, next, &man->error, list) {
508 restart = true;
509 DRM_ERROR("Command buffer error.\n");
510
511 list_del(&entry->list);
512 __vmw_cmdbuf_header_free(entry);
513 wake_up_all(&man->idle_queue);
514 }
515 spin_unlock_bh(&man->lock);
516
517 if (restart && vmw_cmdbuf_startstop(man, true))
518 DRM_ERROR("Failed restarting command buffer context 0.\n");
519
520 /* Send a new fence in case one was removed */
521 vmw_fifo_send_fence(man->dev_priv, &dummy);
522}
523
524/**
525 * vmw_cmdbuf_man idle - Check whether the command buffer manager is idle.
526 *
527 * @man: The command buffer manager.
528 * @check_preempted: Check also the preempted queue for pending command buffers.
529 *
530 */
531static bool vmw_cmdbuf_man_idle(struct vmw_cmdbuf_man *man,
532 bool check_preempted)
533{
534 struct vmw_cmdbuf_context *ctx;
535 bool idle = false;
536 int i;
537
538 spin_lock_bh(&man->lock);
539 vmw_cmdbuf_man_process(man);
540 for_each_cmdbuf_ctx(man, i, ctx) {
541 if (!list_empty(&ctx->submitted) ||
542 !list_empty(&ctx->hw_submitted) ||
543 (check_preempted && !list_empty(&ctx->preempted)))
544 goto out_unlock;
545 }
546
547 idle = list_empty(&man->error);
548
549out_unlock:
550 spin_unlock_bh(&man->lock);
551
552 return idle;
553}
554
555/**
556 * __vmw_cmdbuf_cur_flush - Flush the current command buffer for small kernel
557 * command submissions
558 *
559 * @man: The command buffer manager.
560 *
561 * Flushes the current command buffer without allocating a new one. A new one
562 * is automatically allocated when needed. Call with @man->cur_mutex held.
563 */
564static void __vmw_cmdbuf_cur_flush(struct vmw_cmdbuf_man *man)
565{
566 struct vmw_cmdbuf_header *cur = man->cur;
567
568 WARN_ON(!mutex_is_locked(&man->cur_mutex));
569
570 if (!cur)
571 return;
572
573 spin_lock_bh(&man->lock);
574 if (man->cur_pos == 0) {
575 __vmw_cmdbuf_header_free(cur);
576 goto out_unlock;
577 }
578
579 man->cur->cb_header->length = man->cur_pos;
580 vmw_cmdbuf_ctx_add(man, man->cur, SVGA_CB_CONTEXT_0);
581out_unlock:
582 spin_unlock_bh(&man->lock);
583 man->cur = NULL;
584 man->cur_pos = 0;
585}
586
587/**
588 * vmw_cmdbuf_cur_flush - Flush the current command buffer for small kernel
589 * command submissions
590 *
591 * @man: The command buffer manager.
592 * @interruptible: Whether to sleep interruptible when sleeping.
593 *
594 * Flushes the current command buffer without allocating a new one. A new one
595 * is automatically allocated when needed.
596 */
597int vmw_cmdbuf_cur_flush(struct vmw_cmdbuf_man *man,
598 bool interruptible)
599{
600 int ret = vmw_cmdbuf_cur_lock(man, interruptible);
601
602 if (ret)
603 return ret;
604
605 __vmw_cmdbuf_cur_flush(man);
606 vmw_cmdbuf_cur_unlock(man);
607
608 return 0;
609}
610
611/**
612 * vmw_cmdbuf_idle - Wait for command buffer manager idle.
613 *
614 * @man: The command buffer manager.
615 * @interruptible: Sleep interruptible while waiting.
616 * @timeout: Time out after this many ticks.
617 *
618 * Wait until the command buffer manager has processed all command buffers,
619 * or until a timeout occurs. If a timeout occurs, the function will return
620 * -EBUSY.
621 */
622int vmw_cmdbuf_idle(struct vmw_cmdbuf_man *man, bool interruptible,
623 unsigned long timeout)
624{
625 int ret;
626
627 ret = vmw_cmdbuf_cur_flush(man, interruptible);
628 vmw_generic_waiter_add(man->dev_priv,
629 SVGA_IRQFLAG_COMMAND_BUFFER,
630 &man->dev_priv->cmdbuf_waiters);
631
632 if (interruptible) {
633 ret = wait_event_interruptible_timeout
634 (man->idle_queue, vmw_cmdbuf_man_idle(man, true),
635 timeout);
636 } else {
637 ret = wait_event_timeout
638 (man->idle_queue, vmw_cmdbuf_man_idle(man, true),
639 timeout);
640 }
641 vmw_generic_waiter_remove(man->dev_priv,
642 SVGA_IRQFLAG_COMMAND_BUFFER,
643 &man->dev_priv->cmdbuf_waiters);
644 if (ret == 0) {
645 if (!vmw_cmdbuf_man_idle(man, true))
646 ret = -EBUSY;
647 else
648 ret = 0;
649 }
650 if (ret > 0)
651 ret = 0;
652
653 return ret;
654}
655
656/**
657 * vmw_cmdbuf_try_alloc - Try to allocate buffer space from the main pool.
658 *
659 * @man: The command buffer manager.
660 * @info: Allocation info. Will hold the size on entry and allocated mm node
661 * on successful return.
662 *
663 * Try to allocate buffer space from the main pool. Returns true if succeeded.
664 * If a fatal error was hit, the error code is returned in @info->ret.
665 */
666static bool vmw_cmdbuf_try_alloc(struct vmw_cmdbuf_man *man,
667 struct vmw_cmdbuf_alloc_info *info)
668{
669 int ret;
670
671 if (info->done)
672 return true;
673
674 memset(info->node, 0, sizeof(*info->node));
675 spin_lock_bh(&man->lock);
676 ret = drm_mm_insert_node_generic(&man->mm, info->node, info->page_size,
677 0, 0,
678 DRM_MM_SEARCH_DEFAULT,
679 DRM_MM_CREATE_DEFAULT);
680 if (ret) {
681 vmw_cmdbuf_man_process(man);
682 ret = drm_mm_insert_node_generic(&man->mm, info->node,
683 info->page_size, 0, 0,
684 DRM_MM_SEARCH_DEFAULT,
685 DRM_MM_CREATE_DEFAULT);
686 }
687
688 spin_unlock_bh(&man->lock);
689 info->done = !ret;
690
691 return info->done;
692}
693
694/**
695 * vmw_cmdbuf_alloc_space - Allocate buffer space from the main pool.
696 *
697 * @man: The command buffer manager.
698 * @node: Pointer to pre-allocated range-manager node.
699 * @size: The size of the allocation.
700 * @interruptible: Whether to sleep interruptible while waiting for space.
701 *
702 * This function allocates buffer space from the main pool, and if there is
703 * no space available ATM, it turns on IRQ handling and sleeps waiting for it to
704 * become available.
705 */
706static int vmw_cmdbuf_alloc_space(struct vmw_cmdbuf_man *man,
707 struct drm_mm_node *node,
708 size_t size,
709 bool interruptible)
710{
711 struct vmw_cmdbuf_alloc_info info;
712
713 info.page_size = PAGE_ALIGN(size) >> PAGE_SHIFT;
714 info.node = node;
715 info.done = false;
716
717 /*
718 * To prevent starvation of large requests, only one allocating call
719 * at a time waiting for space.
720 */
721 if (interruptible) {
722 if (mutex_lock_interruptible(&man->space_mutex))
723 return -ERESTARTSYS;
724 } else {
725 mutex_lock(&man->space_mutex);
726 }
727
728 /* Try to allocate space without waiting. */
729 if (vmw_cmdbuf_try_alloc(man, &info))
730 goto out_unlock;
731
732 vmw_generic_waiter_add(man->dev_priv,
733 SVGA_IRQFLAG_COMMAND_BUFFER,
734 &man->dev_priv->cmdbuf_waiters);
735
736 if (interruptible) {
737 int ret;
738
739 ret = wait_event_interruptible
740 (man->alloc_queue, vmw_cmdbuf_try_alloc(man, &info));
741 if (ret) {
742 vmw_generic_waiter_remove
743 (man->dev_priv, SVGA_IRQFLAG_COMMAND_BUFFER,
744 &man->dev_priv->cmdbuf_waiters);
745 mutex_unlock(&man->space_mutex);
746 return ret;
747 }
748 } else {
749 wait_event(man->alloc_queue, vmw_cmdbuf_try_alloc(man, &info));
750 }
751 vmw_generic_waiter_remove(man->dev_priv,
752 SVGA_IRQFLAG_COMMAND_BUFFER,
753 &man->dev_priv->cmdbuf_waiters);
754
755out_unlock:
756 mutex_unlock(&man->space_mutex);
757
758 return 0;
759}
760
761/**
762 * vmw_cmdbuf_space_pool - Set up a command buffer header with command buffer
763 * space from the main pool.
764 *
765 * @man: The command buffer manager.
766 * @header: Pointer to the header to set up.
767 * @size: The requested size of the buffer space.
768 * @interruptible: Whether to sleep interruptible while waiting for space.
769 */
770static int vmw_cmdbuf_space_pool(struct vmw_cmdbuf_man *man,
771 struct vmw_cmdbuf_header *header,
772 size_t size,
773 bool interruptible)
774{
775 SVGACBHeader *cb_hdr;
776 size_t offset;
777 int ret;
778
779 if (!man->has_pool)
780 return -ENOMEM;
781
782 ret = vmw_cmdbuf_alloc_space(man, &header->node, size, interruptible);
783
784 if (ret)
785 return ret;
786
787 header->cb_header = dma_pool_alloc(man->headers, GFP_KERNEL,
788 &header->handle);
789 if (!header->cb_header) {
790 ret = -ENOMEM;
791 goto out_no_cb_header;
792 }
793
794 header->size = header->node.size << PAGE_SHIFT;
795 cb_hdr = header->cb_header;
796 offset = header->node.start << PAGE_SHIFT;
797 header->cmd = man->map + offset;
798 memset(cb_hdr, 0, sizeof(*cb_hdr));
799 if (man->using_mob) {
800 cb_hdr->flags = SVGA_CB_FLAG_MOB;
801 cb_hdr->ptr.mob.mobid = man->cmd_space->mem.start;
802 cb_hdr->ptr.mob.mobOffset = offset;
803 } else {
804 cb_hdr->ptr.pa = (u64)man->handle + (u64)offset;
805 }
806
807 return 0;
808
809out_no_cb_header:
810 spin_lock_bh(&man->lock);
811 drm_mm_remove_node(&header->node);
812 spin_unlock_bh(&man->lock);
813
814 return ret;
815}
816
817/**
818 * vmw_cmdbuf_space_inline - Set up a command buffer header with
819 * inline command buffer space.
820 *
821 * @man: The command buffer manager.
822 * @header: Pointer to the header to set up.
823 * @size: The requested size of the buffer space.
824 */
825static int vmw_cmdbuf_space_inline(struct vmw_cmdbuf_man *man,
826 struct vmw_cmdbuf_header *header,
827 int size)
828{
829 struct vmw_cmdbuf_dheader *dheader;
830 SVGACBHeader *cb_hdr;
831
832 if (WARN_ON_ONCE(size > VMW_CMDBUF_INLINE_SIZE))
833 return -ENOMEM;
834
835 dheader = dma_pool_alloc(man->dheaders, GFP_KERNEL,
836 &header->handle);
837 if (!dheader)
838 return -ENOMEM;
839
840 header->inline_space = true;
841 header->size = VMW_CMDBUF_INLINE_SIZE;
842 cb_hdr = &dheader->cb_header;
843 header->cb_header = cb_hdr;
844 header->cmd = dheader->cmd;
845 memset(dheader, 0, sizeof(*dheader));
846 cb_hdr->status = SVGA_CB_STATUS_NONE;
847 cb_hdr->flags = SVGA_CB_FLAG_NONE;
848 cb_hdr->ptr.pa = (u64)header->handle +
849 (u64)offsetof(struct vmw_cmdbuf_dheader, cmd);
850
851 return 0;
852}
853
854/**
855 * vmw_cmdbuf_alloc - Allocate a command buffer header complete with
856 * command buffer space.
857 *
858 * @man: The command buffer manager.
859 * @size: The requested size of the buffer space.
860 * @interruptible: Whether to sleep interruptible while waiting for space.
861 * @p_header: points to a header pointer to populate on successful return.
862 *
863 * Returns a pointer to command buffer space if successful. Otherwise
864 * returns an error pointer. The header pointer returned in @p_header should
865 * be used for upcoming calls to vmw_cmdbuf_reserve() and vmw_cmdbuf_commit().
866 */
867void *vmw_cmdbuf_alloc(struct vmw_cmdbuf_man *man,
868 size_t size, bool interruptible,
869 struct vmw_cmdbuf_header **p_header)
870{
871 struct vmw_cmdbuf_header *header;
872 int ret = 0;
873
874 *p_header = NULL;
875
876 header = kzalloc(sizeof(*header), GFP_KERNEL);
877 if (!header)
878 return ERR_PTR(-ENOMEM);
879
880 if (size <= VMW_CMDBUF_INLINE_SIZE)
881 ret = vmw_cmdbuf_space_inline(man, header, size);
882 else
883 ret = vmw_cmdbuf_space_pool(man, header, size, interruptible);
884
885 if (ret) {
886 kfree(header);
887 return ERR_PTR(ret);
888 }
889
890 header->man = man;
891 INIT_LIST_HEAD(&header->list);
892 header->cb_header->status = SVGA_CB_STATUS_NONE;
893 *p_header = header;
894
895 return header->cmd;
896}
897
898/**
899 * vmw_cmdbuf_reserve_cur - Reserve space for commands in the current
900 * command buffer.
901 *
902 * @man: The command buffer manager.
903 * @size: The requested size of the commands.
904 * @ctx_id: The context id if any. Otherwise set to SVGA3D_REG_INVALID.
905 * @interruptible: Whether to sleep interruptible while waiting for space.
906 *
907 * Returns a pointer to command buffer space if successful. Otherwise
908 * returns an error pointer.
909 */
910static void *vmw_cmdbuf_reserve_cur(struct vmw_cmdbuf_man *man,
911 size_t size,
912 int ctx_id,
913 bool interruptible)
914{
915 struct vmw_cmdbuf_header *cur;
916 void *ret;
917
918 if (vmw_cmdbuf_cur_lock(man, interruptible))
919 return ERR_PTR(-ERESTARTSYS);
920
921 cur = man->cur;
922 if (cur && (size + man->cur_pos > cur->size ||
923 ((cur->cb_header->flags & SVGA_CB_FLAG_DX_CONTEXT) &&
924 ctx_id != cur->cb_header->dxContext)))
925 __vmw_cmdbuf_cur_flush(man);
926
927 if (!man->cur) {
928 ret = vmw_cmdbuf_alloc(man,
929 max_t(size_t, size, man->default_size),
930 interruptible, &man->cur);
931 if (IS_ERR(ret)) {
932 vmw_cmdbuf_cur_unlock(man);
933 return ret;
934 }
935
936 cur = man->cur;
937 }
938
939 if (ctx_id != SVGA3D_INVALID_ID) {
940 cur->cb_header->flags |= SVGA_CB_FLAG_DX_CONTEXT;
941 cur->cb_header->dxContext = ctx_id;
942 }
943
944 cur->reserved = size;
945
946 return (void *) (man->cur->cmd + man->cur_pos);
947}
948
949/**
950 * vmw_cmdbuf_commit_cur - Commit commands in the current command buffer.
951 *
952 * @man: The command buffer manager.
953 * @size: The size of the commands actually written.
954 * @flush: Whether to flush the command buffer immediately.
955 */
956static void vmw_cmdbuf_commit_cur(struct vmw_cmdbuf_man *man,
957 size_t size, bool flush)
958{
959 struct vmw_cmdbuf_header *cur = man->cur;
960
961 WARN_ON(!mutex_is_locked(&man->cur_mutex));
962
963 WARN_ON(size > cur->reserved);
964 man->cur_pos += size;
965 if (!size)
966 cur->cb_header->flags &= ~SVGA_CB_FLAG_DX_CONTEXT;
967 if (flush)
968 __vmw_cmdbuf_cur_flush(man);
969 vmw_cmdbuf_cur_unlock(man);
970}
971
972/**
973 * vmw_cmdbuf_reserve - Reserve space for commands in a command buffer.
974 *
975 * @man: The command buffer manager.
976 * @size: The requested size of the commands.
977 * @ctx_id: The context id if any. Otherwise set to SVGA3D_REG_INVALID.
978 * @interruptible: Whether to sleep interruptible while waiting for space.
979 * @header: Header of the command buffer. NULL if the current command buffer
980 * should be used.
981 *
982 * Returns a pointer to command buffer space if successful. Otherwise
983 * returns an error pointer.
984 */
985void *vmw_cmdbuf_reserve(struct vmw_cmdbuf_man *man, size_t size,
986 int ctx_id, bool interruptible,
987 struct vmw_cmdbuf_header *header)
988{
989 if (!header)
990 return vmw_cmdbuf_reserve_cur(man, size, ctx_id, interruptible);
991
992 if (size > header->size)
993 return ERR_PTR(-EINVAL);
994
995 if (ctx_id != SVGA3D_INVALID_ID) {
996 header->cb_header->flags |= SVGA_CB_FLAG_DX_CONTEXT;
997 header->cb_header->dxContext = ctx_id;
998 }
999
1000 header->reserved = size;
1001 return header->cmd;
1002}
1003
1004/**
1005 * vmw_cmdbuf_commit - Commit commands in a command buffer.
1006 *
1007 * @man: The command buffer manager.
1008 * @size: The size of the commands actually written.
1009 * @header: Header of the command buffer. NULL if the current command buffer
1010 * should be used.
1011 * @flush: Whether to flush the command buffer immediately.
1012 */
1013void vmw_cmdbuf_commit(struct vmw_cmdbuf_man *man, size_t size,
1014 struct vmw_cmdbuf_header *header, bool flush)
1015{
1016 if (!header) {
1017 vmw_cmdbuf_commit_cur(man, size, flush);
1018 return;
1019 }
1020
1021 (void) vmw_cmdbuf_cur_lock(man, false);
1022 __vmw_cmdbuf_cur_flush(man);
1023 WARN_ON(size > header->reserved);
1024 man->cur = header;
1025 man->cur_pos = size;
1026 if (!size)
1027 header->cb_header->flags &= ~SVGA_CB_FLAG_DX_CONTEXT;
1028 if (flush)
1029 __vmw_cmdbuf_cur_flush(man);
1030 vmw_cmdbuf_cur_unlock(man);
1031}
1032
1033/**
1034 * vmw_cmdbuf_tasklet_schedule - Schedule the interrupt handler bottom half.
1035 *
1036 * @man: The command buffer manager.
1037 */
1038void vmw_cmdbuf_tasklet_schedule(struct vmw_cmdbuf_man *man)
1039{
1040 if (!man)
1041 return;
1042
1043 tasklet_schedule(&man->tasklet);
1044}
1045
1046/**
1047 * vmw_cmdbuf_send_device_command - Send a command through the device context.
1048 *
1049 * @man: The command buffer manager.
1050 * @command: Pointer to the command to send.
1051 * @size: Size of the command.
1052 *
1053 * Synchronously sends a device context command.
1054 */
1055static int vmw_cmdbuf_send_device_command(struct vmw_cmdbuf_man *man,
1056 const void *command,
1057 size_t size)
1058{
1059 struct vmw_cmdbuf_header *header;
1060 int status;
1061 void *cmd = vmw_cmdbuf_alloc(man, size, false, &header);
1062
1063 if (IS_ERR(cmd))
1064 return PTR_ERR(cmd);
1065
1066 memcpy(cmd, command, size);
1067 header->cb_header->length = size;
1068 header->cb_context = SVGA_CB_CONTEXT_DEVICE;
1069 spin_lock_bh(&man->lock);
1070 status = vmw_cmdbuf_header_submit(header);
1071 spin_unlock_bh(&man->lock);
1072 vmw_cmdbuf_header_free(header);
1073
1074 if (status != SVGA_CB_STATUS_COMPLETED) {
1075 DRM_ERROR("Device context command failed with status %d\n",
1076 status);
1077 return -EINVAL;
1078 }
1079
1080 return 0;
1081}
1082
1083/**
1084 * vmw_cmdbuf_startstop - Send a start / stop command through the device
1085 * context.
1086 *
1087 * @man: The command buffer manager.
1088 * @enable: Whether to enable or disable the context.
1089 *
1090 * Synchronously sends a device start / stop context command.
1091 */
1092static int vmw_cmdbuf_startstop(struct vmw_cmdbuf_man *man,
1093 bool enable)
1094{
1095 struct {
1096 uint32 id;
1097 SVGADCCmdStartStop body;
1098 } __packed cmd;
1099
1100 cmd.id = SVGA_DC_CMD_START_STOP_CONTEXT;
1101 cmd.body.enable = (enable) ? 1 : 0;
1102 cmd.body.context = SVGA_CB_CONTEXT_0;
1103
1104 return vmw_cmdbuf_send_device_command(man, &cmd, sizeof(cmd));
1105}
1106
1107/**
1108 * vmw_cmdbuf_set_pool_size - Set command buffer manager sizes
1109 *
1110 * @man: The command buffer manager.
1111 * @size: The size of the main space pool.
1112 * @default_size: The default size of the command buffer for small kernel
1113 * submissions.
1114 *
1115 * Set the size and allocate the main command buffer space pool,
1116 * as well as the default size of the command buffer for
1117 * small kernel submissions. If successful, this enables large command
1118 * submissions. Note that this function requires that rudimentary command
1119 * submission is already available and that the MOB memory manager is alive.
1120 * Returns 0 on success. Negative error code on failure.
1121 */
1122int vmw_cmdbuf_set_pool_size(struct vmw_cmdbuf_man *man,
1123 size_t size, size_t default_size)
1124{
1125 struct vmw_private *dev_priv = man->dev_priv;
1126 bool dummy;
1127 int ret;
1128
1129 if (man->has_pool)
1130 return -EINVAL;
1131
1132 /* First, try to allocate a huge chunk of DMA memory */
1133 size = PAGE_ALIGN(size);
1134 man->map = dma_alloc_coherent(&dev_priv->dev->pdev->dev, size,
1135 &man->handle, GFP_KERNEL);
1136 if (man->map) {
1137 man->using_mob = false;
1138 } else {
1139 /*
1140 * DMA memory failed. If we can have command buffers in a
1141 * MOB, try to use that instead. Note that this will
1142 * actually call into the already enabled manager, when
1143 * binding the MOB.
1144 */
1145 if (!(dev_priv->capabilities & SVGA_CAP_DX))
1146 return -ENOMEM;
1147
1148 ret = ttm_bo_create(&dev_priv->bdev, size, ttm_bo_type_device,
1149 &vmw_mob_ne_placement, 0, false, NULL,
1150 &man->cmd_space);
1151 if (ret)
1152 return ret;
1153
1154 man->using_mob = true;
1155 ret = ttm_bo_kmap(man->cmd_space, 0, size >> PAGE_SHIFT,
1156 &man->map_obj);
1157 if (ret)
1158 goto out_no_map;
1159
1160 man->map = ttm_kmap_obj_virtual(&man->map_obj, &dummy);
1161 }
1162
1163 man->size = size;
1164 drm_mm_init(&man->mm, 0, size >> PAGE_SHIFT);
1165
1166 man->has_pool = true;
1167
1168 /*
1169 * For now, set the default size to VMW_CMDBUF_INLINE_SIZE to
1170 * prevent deadlocks from happening when vmw_cmdbuf_space_pool()
1171 * needs to wait for space and we block on further command
1172 * submissions to be able to free up space.
1173 */
1174 man->default_size = VMW_CMDBUF_INLINE_SIZE;
1175 DRM_INFO("Using command buffers with %s pool.\n",
1176 (man->using_mob) ? "MOB" : "DMA");
1177
1178 return 0;
1179
1180out_no_map:
1181 if (man->using_mob)
1182 ttm_bo_unref(&man->cmd_space);
1183
1184 return ret;
1185}
1186
1187/**
1188 * vmw_cmdbuf_man_create: Create a command buffer manager and enable it for
1189 * inline command buffer submissions only.
1190 *
1191 * @dev_priv: Pointer to device private structure.
1192 *
1193 * Returns a pointer to a cummand buffer manager to success or error pointer
1194 * on failure. The command buffer manager will be enabled for submissions of
1195 * size VMW_CMDBUF_INLINE_SIZE only.
1196 */
1197struct vmw_cmdbuf_man *vmw_cmdbuf_man_create(struct vmw_private *dev_priv)
1198{
1199 struct vmw_cmdbuf_man *man;
1200 struct vmw_cmdbuf_context *ctx;
1201 int i;
1202 int ret;
1203
1204 if (!(dev_priv->capabilities & SVGA_CAP_COMMAND_BUFFERS))
1205 return ERR_PTR(-ENOSYS);
1206
1207 man = kzalloc(sizeof(*man), GFP_KERNEL);
1208 if (!man)
1209 return ERR_PTR(-ENOMEM);
1210
1211 man->headers = dma_pool_create("vmwgfx cmdbuf",
1212 &dev_priv->dev->pdev->dev,
1213 sizeof(SVGACBHeader),
1214 64, PAGE_SIZE);
1215 if (!man->headers) {
1216 ret = -ENOMEM;
1217 goto out_no_pool;
1218 }
1219
1220 man->dheaders = dma_pool_create("vmwgfx inline cmdbuf",
1221 &dev_priv->dev->pdev->dev,
1222 sizeof(struct vmw_cmdbuf_dheader),
1223 64, PAGE_SIZE);
1224 if (!man->dheaders) {
1225 ret = -ENOMEM;
1226 goto out_no_dpool;
1227 }
1228
1229 for_each_cmdbuf_ctx(man, i, ctx)
1230 vmw_cmdbuf_ctx_init(ctx);
1231
1232 INIT_LIST_HEAD(&man->error);
1233 spin_lock_init(&man->lock);
1234 mutex_init(&man->cur_mutex);
1235 mutex_init(&man->space_mutex);
1236 tasklet_init(&man->tasklet, vmw_cmdbuf_man_tasklet,
1237 (unsigned long) man);
1238 man->default_size = VMW_CMDBUF_INLINE_SIZE;
1239 init_waitqueue_head(&man->alloc_queue);
1240 init_waitqueue_head(&man->idle_queue);
1241 man->dev_priv = dev_priv;
1242 man->max_hw_submitted = SVGA_CB_MAX_QUEUED_PER_CONTEXT - 1;
1243 INIT_WORK(&man->work, &vmw_cmdbuf_work_func);
1244 vmw_generic_waiter_add(dev_priv, SVGA_IRQFLAG_ERROR,
1245 &dev_priv->error_waiters);
1246 ret = vmw_cmdbuf_startstop(man, true);
1247 if (ret) {
1248 DRM_ERROR("Failed starting command buffer context 0.\n");
1249 vmw_cmdbuf_man_destroy(man);
1250 return ERR_PTR(ret);
1251 }
1252
1253 return man;
1254
1255out_no_dpool:
1256 dma_pool_destroy(man->headers);
1257out_no_pool:
1258 kfree(man);
1259
1260 return ERR_PTR(ret);
1261}
1262
1263/**
1264 * vmw_cmdbuf_remove_pool - Take down the main buffer space pool.
1265 *
1266 * @man: Pointer to a command buffer manager.
1267 *
1268 * This function removes the main buffer space pool, and should be called
1269 * before MOB memory management is removed. When this function has been called,
1270 * only small command buffer submissions of size VMW_CMDBUF_INLINE_SIZE or
1271 * less are allowed, and the default size of the command buffer for small kernel
1272 * submissions is also set to this size.
1273 */
1274void vmw_cmdbuf_remove_pool(struct vmw_cmdbuf_man *man)
1275{
1276 if (!man->has_pool)
1277 return;
1278
1279 man->has_pool = false;
1280 man->default_size = VMW_CMDBUF_INLINE_SIZE;
1281 (void) vmw_cmdbuf_idle(man, false, 10*HZ);
1282 if (man->using_mob) {
1283 (void) ttm_bo_kunmap(&man->map_obj);
1284 ttm_bo_unref(&man->cmd_space);
1285 } else {
1286 dma_free_coherent(&man->dev_priv->dev->pdev->dev,
1287 man->size, man->map, man->handle);
1288 }
1289}
1290
1291/**
1292 * vmw_cmdbuf_man_destroy - Take down a command buffer manager.
1293 *
1294 * @man: Pointer to a command buffer manager.
1295 *
1296 * This function idles and then destroys a command buffer manager.
1297 */
1298void vmw_cmdbuf_man_destroy(struct vmw_cmdbuf_man *man)
1299{
1300 WARN_ON_ONCE(man->has_pool);
1301 (void) vmw_cmdbuf_idle(man, false, 10*HZ);
1302 if (vmw_cmdbuf_startstop(man, false))
1303 DRM_ERROR("Failed stopping command buffer context 0.\n");
1304
1305 vmw_generic_waiter_remove(man->dev_priv, SVGA_IRQFLAG_ERROR,
1306 &man->dev_priv->error_waiters);
1307 tasklet_kill(&man->tasklet);
1308 (void) cancel_work_sync(&man->work);
1309 dma_pool_destroy(man->dheaders);
1310 dma_pool_destroy(man->headers);
1311 mutex_destroy(&man->cur_mutex);
1312 mutex_destroy(&man->space_mutex);
1313 kfree(man);
1314}