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1// SPDX-License-Identifier: GPL-2.0 OR MIT
2/**************************************************************************
3 *
4 * Copyright 2015 VMware, Inc., Palo Alto, CA., USA
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28#include <linux/dmapool.h>
29#include <linux/pci.h>
30
31#include <drm/ttm/ttm_bo_api.h>
32
33#include "vmwgfx_drv.h"
34
35/*
36 * Size of inline command buffers. Try to make sure that a page size is a
37 * multiple of the DMA pool allocation size.
38 */
39#define VMW_CMDBUF_INLINE_ALIGN 64
40#define VMW_CMDBUF_INLINE_SIZE \
41 (1024 - ALIGN(sizeof(SVGACBHeader), VMW_CMDBUF_INLINE_ALIGN))
42
43/**
44 * struct vmw_cmdbuf_context - Command buffer context queues
45 *
46 * @submitted: List of command buffers that have been submitted to the
47 * manager but not yet submitted to hardware.
48 * @hw_submitted: List of command buffers submitted to hardware.
49 * @preempted: List of preempted command buffers.
50 * @num_hw_submitted: Number of buffers currently being processed by hardware
51 */
52struct vmw_cmdbuf_context {
53 struct list_head submitted;
54 struct list_head hw_submitted;
55 struct list_head preempted;
56 unsigned num_hw_submitted;
57 bool block_submission;
58};
59
60/**
61 * struct vmw_cmdbuf_man: - Command buffer manager
62 *
63 * @cur_mutex: Mutex protecting the command buffer used for incremental small
64 * kernel command submissions, @cur.
65 * @space_mutex: Mutex to protect against starvation when we allocate
66 * main pool buffer space.
67 * @error_mutex: Mutex to serialize the work queue error handling.
68 * Note this is not needed if the same workqueue handler
69 * can't race with itself...
70 * @work: A struct work_struct implementeing command buffer error handling.
71 * Immutable.
72 * @dev_priv: Pointer to the device private struct. Immutable.
73 * @ctx: Array of command buffer context queues. The queues and the context
74 * data is protected by @lock.
75 * @error: List of command buffers that have caused device errors.
76 * Protected by @lock.
77 * @mm: Range manager for the command buffer space. Manager allocations and
78 * frees are protected by @lock.
79 * @cmd_space: Buffer object for the command buffer space, unless we were
80 * able to make a contigous coherent DMA memory allocation, @handle. Immutable.
81 * @map_obj: Mapping state for @cmd_space. Immutable.
82 * @map: Pointer to command buffer space. May be a mapped buffer object or
83 * a contigous coherent DMA memory allocation. Immutable.
84 * @cur: Command buffer for small kernel command submissions. Protected by
85 * the @cur_mutex.
86 * @cur_pos: Space already used in @cur. Protected by @cur_mutex.
87 * @default_size: Default size for the @cur command buffer. Immutable.
88 * @max_hw_submitted: Max number of in-flight command buffers the device can
89 * handle. Immutable.
90 * @lock: Spinlock protecting command submission queues.
91 * @header: Pool of DMA memory for device command buffer headers.
92 * Internal protection.
93 * @dheaders: Pool of DMA memory for device command buffer headers with trailing
94 * space for inline data. Internal protection.
95 * @alloc_queue: Wait queue for processes waiting to allocate command buffer
96 * space.
97 * @idle_queue: Wait queue for processes waiting for command buffer idle.
98 * @irq_on: Whether the process function has requested irq to be turned on.
99 * Protected by @lock.
100 * @using_mob: Whether the command buffer space is a MOB or a contigous DMA
101 * allocation. Immutable.
102 * @has_pool: Has a large pool of DMA memory which allows larger allocations.
103 * Typically this is false only during bootstrap.
104 * @handle: DMA address handle for the command buffer space if @using_mob is
105 * false. Immutable.
106 * @size: The size of the command buffer space. Immutable.
107 * @num_contexts: Number of contexts actually enabled.
108 */
109struct vmw_cmdbuf_man {
110 struct mutex cur_mutex;
111 struct mutex space_mutex;
112 struct mutex error_mutex;
113 struct work_struct work;
114 struct vmw_private *dev_priv;
115 struct vmw_cmdbuf_context ctx[SVGA_CB_CONTEXT_MAX];
116 struct list_head error;
117 struct drm_mm mm;
118 struct ttm_buffer_object *cmd_space;
119 struct ttm_bo_kmap_obj map_obj;
120 u8 *map;
121 struct vmw_cmdbuf_header *cur;
122 size_t cur_pos;
123 size_t default_size;
124 unsigned max_hw_submitted;
125 spinlock_t lock;
126 struct dma_pool *headers;
127 struct dma_pool *dheaders;
128 wait_queue_head_t alloc_queue;
129 wait_queue_head_t idle_queue;
130 bool irq_on;
131 bool using_mob;
132 bool has_pool;
133 dma_addr_t handle;
134 size_t size;
135 u32 num_contexts;
136};
137
138/**
139 * struct vmw_cmdbuf_header - Command buffer metadata
140 *
141 * @man: The command buffer manager.
142 * @cb_header: Device command buffer header, allocated from a DMA pool.
143 * @cb_context: The device command buffer context.
144 * @list: List head for attaching to the manager lists.
145 * @node: The range manager node.
146 * @handle. The DMA address of @cb_header. Handed to the device on command
147 * buffer submission.
148 * @cmd: Pointer to the command buffer space of this buffer.
149 * @size: Size of the command buffer space of this buffer.
150 * @reserved: Reserved space of this buffer.
151 * @inline_space: Whether inline command buffer space is used.
152 */
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_cmbuf_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_del(&entry->list);
361 list_add_tail(&entry->list, &ctx->hw_submitted);
362 ctx->num_hw_submitted++;
363 }
364
365}
366
367/**
368 * vmw_cmdbuf_ctx_submit: Process a command buffer context.
369 *
370 * @man: The command buffer manager.
371 * @ctx: The command buffer context.
372 *
373 * Submit command buffers to hardware if possible, and process finished
374 * buffers. Typically freeing them, but on preemption or error take
375 * appropriate action. Wake up waiters if appropriate.
376 */
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;
518 bool send_fence = false;
519 struct list_head restart_head[SVGA_CB_CONTEXT_MAX];
520 int i;
521 struct vmw_cmdbuf_context *ctx;
522 bool global_block = false;
523
524 for_each_cmdbuf_ctx(man, i, ctx)
525 INIT_LIST_HEAD(&restart_head[i]);
526
527 mutex_lock(&man->error_mutex);
528 spin_lock(&man->lock);
529 list_for_each_entry_safe(entry, next, &man->error, list) {
530 SVGACBHeader *cb_hdr = entry->cb_header;
531 SVGA3dCmdHeader *header = (SVGA3dCmdHeader *)
532 (entry->cmd + cb_hdr->errorOffset);
533 u32 error_cmd_size, new_start_offset;
534 const char *cmd_name;
535
536 list_del_init(&entry->list);
537 global_block = true;
538
539 if (!vmw_cmd_describe(header, &error_cmd_size, &cmd_name)) {
540 VMW_DEBUG_USER("Unknown command causing device error.\n");
541 VMW_DEBUG_USER("Command buffer offset is %lu\n",
542 (unsigned long) cb_hdr->errorOffset);
543 __vmw_cmdbuf_header_free(entry);
544 send_fence = true;
545 continue;
546 }
547
548 VMW_DEBUG_USER("Command \"%s\" causing device error.\n",
549 cmd_name);
550 VMW_DEBUG_USER("Command buffer offset is %lu\n",
551 (unsigned long) cb_hdr->errorOffset);
552 VMW_DEBUG_USER("Command size is %lu\n",
553 (unsigned long) error_cmd_size);
554
555 new_start_offset = cb_hdr->errorOffset + error_cmd_size;
556
557 if (new_start_offset >= cb_hdr->length) {
558 __vmw_cmdbuf_header_free(entry);
559 send_fence = true;
560 continue;
561 }
562
563 if (man->using_mob)
564 cb_hdr->ptr.mob.mobOffset += new_start_offset;
565 else
566 cb_hdr->ptr.pa += (u64) new_start_offset;
567
568 entry->cmd += new_start_offset;
569 cb_hdr->length -= new_start_offset;
570 cb_hdr->errorOffset = 0;
571 cb_hdr->offset = 0;
572
573 list_add_tail(&entry->list, &restart_head[entry->cb_context]);
574 }
575
576 for_each_cmdbuf_ctx(man, i, ctx)
577 man->ctx[i].block_submission = true;
578
579 spin_unlock(&man->lock);
580
581 /* Preempt all contexts */
582 if (global_block && vmw_cmdbuf_preempt(man, 0))
583 DRM_ERROR("Failed preempting command buffer contexts\n");
584
585 spin_lock(&man->lock);
586 for_each_cmdbuf_ctx(man, i, ctx) {
587 /* Move preempted command buffers to the preempted queue. */
588 vmw_cmdbuf_ctx_process(man, ctx, &dummy);
589
590 /*
591 * Add the preempted queue after the command buffer
592 * that caused an error.
593 */
594 list_splice_init(&ctx->preempted, restart_head[i].prev);
595
596 /*
597 * Finally add all command buffers first in the submitted
598 * queue, to rerun them.
599 */
600
601 ctx->block_submission = false;
602 list_splice_init(&restart_head[i], &ctx->submitted);
603 }
604
605 vmw_cmdbuf_man_process(man);
606 spin_unlock(&man->lock);
607
608 if (global_block && vmw_cmdbuf_startstop(man, 0, true))
609 DRM_ERROR("Failed restarting command buffer contexts\n");
610
611 /* Send a new fence in case one was removed */
612 if (send_fence) {
613 vmw_fifo_send_fence(man->dev_priv, &dummy);
614 wake_up_all(&man->idle_queue);
615 }
616
617 mutex_unlock(&man->error_mutex);
618}
619
620/**
621 * vmw_cmdbuf_man idle - Check whether the command buffer manager is idle.
622 *
623 * @man: The command buffer manager.
624 * @check_preempted: Check also the preempted queue for pending command buffers.
625 *
626 */
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 = PAGE_ALIGN(size) >> PAGE_SHIFT;
804 info.node = node;
805 info.done = false;
806
807 /*
808 * To prevent starvation of large requests, only one allocating call
809 * at a time waiting for space.
810 */
811 if (interruptible) {
812 if (mutex_lock_interruptible(&man->space_mutex))
813 return -ERESTARTSYS;
814 } else {
815 mutex_lock(&man->space_mutex);
816 }
817
818 /* Try to allocate space without waiting. */
819 if (vmw_cmdbuf_try_alloc(man, &info))
820 goto out_unlock;
821
822 vmw_generic_waiter_add(man->dev_priv,
823 SVGA_IRQFLAG_COMMAND_BUFFER,
824 &man->dev_priv->cmdbuf_waiters);
825
826 if (interruptible) {
827 int ret;
828
829 ret = wait_event_interruptible
830 (man->alloc_queue, vmw_cmdbuf_try_alloc(man, &info));
831 if (ret) {
832 vmw_generic_waiter_remove
833 (man->dev_priv, SVGA_IRQFLAG_COMMAND_BUFFER,
834 &man->dev_priv->cmdbuf_waiters);
835 mutex_unlock(&man->space_mutex);
836 return ret;
837 }
838 } else {
839 wait_event(man->alloc_queue, vmw_cmdbuf_try_alloc(man, &info));
840 }
841 vmw_generic_waiter_remove(man->dev_priv,
842 SVGA_IRQFLAG_COMMAND_BUFFER,
843 &man->dev_priv->cmdbuf_waiters);
844
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->mem.start;
891 cb_hdr->ptr.mob.mobOffset = offset;
892 } else {
893 cb_hdr->ptr.pa = (u64)man->handle + (u64)offset;
894 }
895
896 return 0;
897
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 *
1165 * Synchronously sends a preempt command.
1166 */
1167static int vmw_cmdbuf_preempt(struct vmw_cmdbuf_man *man, u32 context)
1168{
1169 struct {
1170 uint32 id;
1171 SVGADCCmdPreempt body;
1172 } __packed cmd;
1173
1174 cmd.id = SVGA_DC_CMD_PREEMPT;
1175 cmd.body.context = SVGA_CB_CONTEXT_0 + context;
1176 cmd.body.ignoreIDZero = 0;
1177
1178 return vmw_cmdbuf_send_device_command(man, &cmd, sizeof(cmd));
1179}
1180
1181
1182/**
1183 * vmw_cmdbuf_startstop - Send a start / stop command through the device
1184 * context.
1185 *
1186 * @man: The command buffer manager.
1187 * @enable: Whether to enable or disable the context.
1188 *
1189 * Synchronously sends a device start / stop context command.
1190 */
1191static int vmw_cmdbuf_startstop(struct vmw_cmdbuf_man *man, u32 context,
1192 bool enable)
1193{
1194 struct {
1195 uint32 id;
1196 SVGADCCmdStartStop body;
1197 } __packed cmd;
1198
1199 cmd.id = SVGA_DC_CMD_START_STOP_CONTEXT;
1200 cmd.body.enable = (enable) ? 1 : 0;
1201 cmd.body.context = SVGA_CB_CONTEXT_0 + context;
1202
1203 return vmw_cmdbuf_send_device_command(man, &cmd, sizeof(cmd));
1204}
1205
1206/**
1207 * vmw_cmdbuf_set_pool_size - Set command buffer manager sizes
1208 *
1209 * @man: The command buffer manager.
1210 * @size: The size of the main space pool.
1211 * @default_size: The default size of the command buffer for small kernel
1212 * submissions.
1213 *
1214 * Set the size and allocate the main command buffer space pool,
1215 * as well as the default size of the command buffer for
1216 * small kernel submissions. If successful, this enables large command
1217 * submissions. Note that this function requires that rudimentary command
1218 * submission is already available and that the MOB memory manager is alive.
1219 * Returns 0 on success. Negative error code on failure.
1220 */
1221int vmw_cmdbuf_set_pool_size(struct vmw_cmdbuf_man *man,
1222 size_t size, size_t default_size)
1223{
1224 struct vmw_private *dev_priv = man->dev_priv;
1225 bool dummy;
1226 int ret;
1227
1228 if (man->has_pool)
1229 return -EINVAL;
1230
1231 /* First, try to allocate a huge chunk of DMA memory */
1232 size = PAGE_ALIGN(size);
1233 man->map = dma_alloc_coherent(&dev_priv->dev->pdev->dev, size,
1234 &man->handle, GFP_KERNEL);
1235 if (man->map) {
1236 man->using_mob = false;
1237 } else {
1238 /*
1239 * DMA memory failed. If we can have command buffers in a
1240 * MOB, try to use that instead. Note that this will
1241 * actually call into the already enabled manager, when
1242 * binding the MOB.
1243 */
1244 if (!(dev_priv->capabilities & SVGA_CAP_DX))
1245 return -ENOMEM;
1246
1247 ret = ttm_bo_create(&dev_priv->bdev, size, ttm_bo_type_device,
1248 &vmw_mob_ne_placement, 0, false,
1249 &man->cmd_space);
1250 if (ret)
1251 return ret;
1252
1253 man->using_mob = true;
1254 ret = ttm_bo_kmap(man->cmd_space, 0, size >> PAGE_SHIFT,
1255 &man->map_obj);
1256 if (ret)
1257 goto out_no_map;
1258
1259 man->map = ttm_kmap_obj_virtual(&man->map_obj, &dummy);
1260 }
1261
1262 man->size = size;
1263 drm_mm_init(&man->mm, 0, size >> PAGE_SHIFT);
1264
1265 man->has_pool = true;
1266
1267 /*
1268 * For now, set the default size to VMW_CMDBUF_INLINE_SIZE to
1269 * prevent deadlocks from happening when vmw_cmdbuf_space_pool()
1270 * needs to wait for space and we block on further command
1271 * submissions to be able to free up space.
1272 */
1273 man->default_size = VMW_CMDBUF_INLINE_SIZE;
1274 DRM_INFO("Using command buffers with %s pool.\n",
1275 (man->using_mob) ? "MOB" : "DMA");
1276
1277 return 0;
1278
1279out_no_map:
1280 if (man->using_mob) {
1281 ttm_bo_put(man->cmd_space);
1282 man->cmd_space = NULL;
1283 }
1284
1285 return ret;
1286}
1287
1288/**
1289 * vmw_cmdbuf_man_create: Create a command buffer manager and enable it for
1290 * inline command buffer submissions only.
1291 *
1292 * @dev_priv: Pointer to device private structure.
1293 *
1294 * Returns a pointer to a cummand buffer manager to success or error pointer
1295 * on failure. The command buffer manager will be enabled for submissions of
1296 * size VMW_CMDBUF_INLINE_SIZE only.
1297 */
1298struct vmw_cmdbuf_man *vmw_cmdbuf_man_create(struct vmw_private *dev_priv)
1299{
1300 struct vmw_cmdbuf_man *man;
1301 struct vmw_cmdbuf_context *ctx;
1302 unsigned int i;
1303 int ret;
1304
1305 if (!(dev_priv->capabilities & SVGA_CAP_COMMAND_BUFFERS))
1306 return ERR_PTR(-ENOSYS);
1307
1308 man = kzalloc(sizeof(*man), GFP_KERNEL);
1309 if (!man)
1310 return ERR_PTR(-ENOMEM);
1311
1312 man->num_contexts = (dev_priv->capabilities & SVGA_CAP_HP_CMD_QUEUE) ?
1313 2 : 1;
1314 man->headers = dma_pool_create("vmwgfx cmdbuf",
1315 &dev_priv->dev->pdev->dev,
1316 sizeof(SVGACBHeader),
1317 64, PAGE_SIZE);
1318 if (!man->headers) {
1319 ret = -ENOMEM;
1320 goto out_no_pool;
1321 }
1322
1323 man->dheaders = dma_pool_create("vmwgfx inline cmdbuf",
1324 &dev_priv->dev->pdev->dev,
1325 sizeof(struct vmw_cmdbuf_dheader),
1326 64, PAGE_SIZE);
1327 if (!man->dheaders) {
1328 ret = -ENOMEM;
1329 goto out_no_dpool;
1330 }
1331
1332 for_each_cmdbuf_ctx(man, i, ctx)
1333 vmw_cmdbuf_ctx_init(ctx);
1334
1335 INIT_LIST_HEAD(&man->error);
1336 spin_lock_init(&man->lock);
1337 mutex_init(&man->cur_mutex);
1338 mutex_init(&man->space_mutex);
1339 mutex_init(&man->error_mutex);
1340 man->default_size = VMW_CMDBUF_INLINE_SIZE;
1341 init_waitqueue_head(&man->alloc_queue);
1342 init_waitqueue_head(&man->idle_queue);
1343 man->dev_priv = dev_priv;
1344 man->max_hw_submitted = SVGA_CB_MAX_QUEUED_PER_CONTEXT - 1;
1345 INIT_WORK(&man->work, &vmw_cmdbuf_work_func);
1346 vmw_generic_waiter_add(dev_priv, SVGA_IRQFLAG_ERROR,
1347 &dev_priv->error_waiters);
1348 ret = vmw_cmdbuf_startstop(man, 0, true);
1349 if (ret) {
1350 DRM_ERROR("Failed starting command buffer contexts\n");
1351 vmw_cmdbuf_man_destroy(man);
1352 return ERR_PTR(ret);
1353 }
1354
1355 return man;
1356
1357out_no_dpool:
1358 dma_pool_destroy(man->headers);
1359out_no_pool:
1360 kfree(man);
1361
1362 return ERR_PTR(ret);
1363}
1364
1365/**
1366 * vmw_cmdbuf_remove_pool - Take down the main buffer space pool.
1367 *
1368 * @man: Pointer to a command buffer manager.
1369 *
1370 * This function removes the main buffer space pool, and should be called
1371 * before MOB memory management is removed. When this function has been called,
1372 * only small command buffer submissions of size VMW_CMDBUF_INLINE_SIZE or
1373 * less are allowed, and the default size of the command buffer for small kernel
1374 * submissions is also set to this size.
1375 */
1376void vmw_cmdbuf_remove_pool(struct vmw_cmdbuf_man *man)
1377{
1378 if (!man->has_pool)
1379 return;
1380
1381 man->has_pool = false;
1382 man->default_size = VMW_CMDBUF_INLINE_SIZE;
1383 (void) vmw_cmdbuf_idle(man, false, 10*HZ);
1384 if (man->using_mob) {
1385 (void) ttm_bo_kunmap(&man->map_obj);
1386 ttm_bo_put(man->cmd_space);
1387 man->cmd_space = NULL;
1388 } else {
1389 dma_free_coherent(&man->dev_priv->dev->pdev->dev,
1390 man->size, man->map, man->handle);
1391 }
1392}
1393
1394/**
1395 * vmw_cmdbuf_man_destroy - Take down a command buffer manager.
1396 *
1397 * @man: Pointer to a command buffer manager.
1398 *
1399 * This function idles and then destroys a command buffer manager.
1400 */
1401void vmw_cmdbuf_man_destroy(struct vmw_cmdbuf_man *man)
1402{
1403 WARN_ON_ONCE(man->has_pool);
1404 (void) vmw_cmdbuf_idle(man, false, 10*HZ);
1405
1406 if (vmw_cmdbuf_startstop(man, 0, false))
1407 DRM_ERROR("Failed stopping command buffer contexts.\n");
1408
1409 vmw_generic_waiter_remove(man->dev_priv, SVGA_IRQFLAG_ERROR,
1410 &man->dev_priv->error_waiters);
1411 (void) cancel_work_sync(&man->work);
1412 dma_pool_destroy(man->dheaders);
1413 dma_pool_destroy(man->headers);
1414 mutex_destroy(&man->cur_mutex);
1415 mutex_destroy(&man->space_mutex);
1416 mutex_destroy(&man->error_mutex);
1417 kfree(man);
1418}