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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 if (sizeof(header->handle) > 4)
297 val = (header->handle >> 32);
298 else
299 val = 0;
300 vmw_write(man->dev_priv, SVGA_REG_COMMAND_HIGH, val);
301
302 val = (header->handle & 0xFFFFFFFFULL);
303 val |= header->cb_context & SVGA_CB_CONTEXT_MASK;
304 vmw_write(man->dev_priv, SVGA_REG_COMMAND_LOW, val);
305
306 return header->cb_header->status;
307}
308
309/**
310 * vmw_cmdbuf_ctx_init: Initialize a command buffer context.
311 *
312 * @ctx: The command buffer context to initialize
313 */
314static void vmw_cmdbuf_ctx_init(struct vmw_cmdbuf_context *ctx)
315{
316 INIT_LIST_HEAD(&ctx->hw_submitted);
317 INIT_LIST_HEAD(&ctx->submitted);
318 INIT_LIST_HEAD(&ctx->preempted);
319 ctx->num_hw_submitted = 0;
320}
321
322/**
323 * vmw_cmdbuf_ctx_submit: Submit command buffers from a command buffer
324 * context.
325 *
326 * @man: The command buffer manager.
327 * @ctx: The command buffer context.
328 *
329 * Submits command buffers to hardware until there are no more command
330 * buffers to submit or the hardware can't handle more command buffers.
331 */
332static void vmw_cmdbuf_ctx_submit(struct vmw_cmdbuf_man *man,
333 struct vmw_cmdbuf_context *ctx)
334{
335 while (ctx->num_hw_submitted < man->max_hw_submitted &&
336 !list_empty(&ctx->submitted)) {
337 struct vmw_cmdbuf_header *entry;
338 SVGACBStatus status;
339
340 entry = list_first_entry(&ctx->submitted,
341 struct vmw_cmdbuf_header,
342 list);
343
344 status = vmw_cmdbuf_header_submit(entry);
345
346 /* This should never happen */
347 if (WARN_ON_ONCE(status == SVGA_CB_STATUS_QUEUE_FULL)) {
348 entry->cb_header->status = SVGA_CB_STATUS_NONE;
349 break;
350 }
351
352 list_del(&entry->list);
353 list_add_tail(&entry->list, &ctx->hw_submitted);
354 ctx->num_hw_submitted++;
355 }
356
357}
358
359/**
360 * vmw_cmdbuf_ctx_submit: Process a command buffer context.
361 *
362 * @man: The command buffer manager.
363 * @ctx: The command buffer context.
364 *
365 * Submit command buffers to hardware if possible, and process finished
366 * buffers. Typically freeing them, but on preemption or error take
367 * appropriate action. Wake up waiters if appropriate.
368 */
369static void vmw_cmdbuf_ctx_process(struct vmw_cmdbuf_man *man,
370 struct vmw_cmdbuf_context *ctx,
371 int *notempty)
372{
373 struct vmw_cmdbuf_header *entry, *next;
374
375 vmw_cmdbuf_ctx_submit(man, ctx);
376
377 list_for_each_entry_safe(entry, next, &ctx->hw_submitted, list) {
378 SVGACBStatus status = entry->cb_header->status;
379
380 if (status == SVGA_CB_STATUS_NONE)
381 break;
382
383 list_del(&entry->list);
384 wake_up_all(&man->idle_queue);
385 ctx->num_hw_submitted--;
386 switch (status) {
387 case SVGA_CB_STATUS_COMPLETED:
388 __vmw_cmdbuf_header_free(entry);
389 break;
390 case SVGA_CB_STATUS_COMMAND_ERROR:
391 case SVGA_CB_STATUS_CB_HEADER_ERROR:
392 list_add_tail(&entry->list, &man->error);
393 schedule_work(&man->work);
394 break;
395 case SVGA_CB_STATUS_PREEMPTED:
396 list_add(&entry->list, &ctx->preempted);
397 break;
398 default:
399 WARN_ONCE(true, "Undefined command buffer status.\n");
400 __vmw_cmdbuf_header_free(entry);
401 break;
402 }
403 }
404
405 vmw_cmdbuf_ctx_submit(man, ctx);
406 if (!list_empty(&ctx->submitted))
407 (*notempty)++;
408}
409
410/**
411 * vmw_cmdbuf_man_process - Process all command buffer contexts and
412 * switch on and off irqs as appropriate.
413 *
414 * @man: The command buffer manager.
415 *
416 * Calls vmw_cmdbuf_ctx_process() on all contexts. If any context has
417 * command buffers left that are not submitted to hardware, Make sure
418 * IRQ handling is turned on. Otherwise, make sure it's turned off.
419 */
420static void vmw_cmdbuf_man_process(struct vmw_cmdbuf_man *man)
421{
422 int notempty;
423 struct vmw_cmdbuf_context *ctx;
424 int i;
425
426retry:
427 notempty = 0;
428 for_each_cmdbuf_ctx(man, i, ctx)
429 vmw_cmdbuf_ctx_process(man, ctx, ¬empty);
430
431 if (man->irq_on && !notempty) {
432 vmw_generic_waiter_remove(man->dev_priv,
433 SVGA_IRQFLAG_COMMAND_BUFFER,
434 &man->dev_priv->cmdbuf_waiters);
435 man->irq_on = false;
436 } else if (!man->irq_on && notempty) {
437 vmw_generic_waiter_add(man->dev_priv,
438 SVGA_IRQFLAG_COMMAND_BUFFER,
439 &man->dev_priv->cmdbuf_waiters);
440 man->irq_on = true;
441
442 /* Rerun in case we just missed an irq. */
443 goto retry;
444 }
445}
446
447/**
448 * vmw_cmdbuf_ctx_add - Schedule a command buffer for submission on a
449 * command buffer context
450 *
451 * @man: The command buffer manager.
452 * @header: The header of the buffer to submit.
453 * @cb_context: The command buffer context to use.
454 *
455 * This function adds @header to the "submitted" queue of the command
456 * buffer context identified by @cb_context. It then calls the command buffer
457 * manager processing to potentially submit the buffer to hardware.
458 * @man->lock needs to be held when calling this function.
459 */
460static void vmw_cmdbuf_ctx_add(struct vmw_cmdbuf_man *man,
461 struct vmw_cmdbuf_header *header,
462 SVGACBContext cb_context)
463{
464 if (!(header->cb_header->flags & SVGA_CB_FLAG_DX_CONTEXT))
465 header->cb_header->dxContext = 0;
466 header->cb_context = cb_context;
467 list_add_tail(&header->list, &man->ctx[cb_context].submitted);
468
469 vmw_cmdbuf_man_process(man);
470}
471
472/**
473 * vmw_cmdbuf_man_tasklet - The main part of the command buffer interrupt
474 * handler implemented as a tasklet.
475 *
476 * @data: Tasklet closure. A pointer to the command buffer manager cast to
477 * an unsigned long.
478 *
479 * The bottom half (tasklet) of the interrupt handler simply calls into the
480 * command buffer processor to free finished buffers and submit any
481 * queued buffers to hardware.
482 */
483static void vmw_cmdbuf_man_tasklet(unsigned long data)
484{
485 struct vmw_cmdbuf_man *man = (struct vmw_cmdbuf_man *) data;
486
487 spin_lock(&man->lock);
488 vmw_cmdbuf_man_process(man);
489 spin_unlock(&man->lock);
490}
491
492/**
493 * vmw_cmdbuf_work_func - The deferred work function that handles
494 * command buffer errors.
495 *
496 * @work: The work func closure argument.
497 *
498 * Restarting the command buffer context after an error requires process
499 * context, so it is deferred to this work function.
500 */
501static void vmw_cmdbuf_work_func(struct work_struct *work)
502{
503 struct vmw_cmdbuf_man *man =
504 container_of(work, struct vmw_cmdbuf_man, work);
505 struct vmw_cmdbuf_header *entry, *next;
506 uint32_t dummy;
507 bool restart = false;
508
509 spin_lock_bh(&man->lock);
510 list_for_each_entry_safe(entry, next, &man->error, list) {
511 restart = true;
512 DRM_ERROR("Command buffer error.\n");
513
514 list_del(&entry->list);
515 __vmw_cmdbuf_header_free(entry);
516 wake_up_all(&man->idle_queue);
517 }
518 spin_unlock_bh(&man->lock);
519
520 if (restart && vmw_cmdbuf_startstop(man, true))
521 DRM_ERROR("Failed restarting command buffer context 0.\n");
522
523 /* Send a new fence in case one was removed */
524 vmw_fifo_send_fence(man->dev_priv, &dummy);
525}
526
527/**
528 * vmw_cmdbuf_man idle - Check whether the command buffer manager is idle.
529 *
530 * @man: The command buffer manager.
531 * @check_preempted: Check also the preempted queue for pending command buffers.
532 *
533 */
534static bool vmw_cmdbuf_man_idle(struct vmw_cmdbuf_man *man,
535 bool check_preempted)
536{
537 struct vmw_cmdbuf_context *ctx;
538 bool idle = false;
539 int i;
540
541 spin_lock_bh(&man->lock);
542 vmw_cmdbuf_man_process(man);
543 for_each_cmdbuf_ctx(man, i, ctx) {
544 if (!list_empty(&ctx->submitted) ||
545 !list_empty(&ctx->hw_submitted) ||
546 (check_preempted && !list_empty(&ctx->preempted)))
547 goto out_unlock;
548 }
549
550 idle = list_empty(&man->error);
551
552out_unlock:
553 spin_unlock_bh(&man->lock);
554
555 return idle;
556}
557
558/**
559 * __vmw_cmdbuf_cur_flush - Flush the current command buffer for small kernel
560 * command submissions
561 *
562 * @man: The command buffer manager.
563 *
564 * Flushes the current command buffer without allocating a new one. A new one
565 * is automatically allocated when needed. Call with @man->cur_mutex held.
566 */
567static void __vmw_cmdbuf_cur_flush(struct vmw_cmdbuf_man *man)
568{
569 struct vmw_cmdbuf_header *cur = man->cur;
570
571 WARN_ON(!mutex_is_locked(&man->cur_mutex));
572
573 if (!cur)
574 return;
575
576 spin_lock_bh(&man->lock);
577 if (man->cur_pos == 0) {
578 __vmw_cmdbuf_header_free(cur);
579 goto out_unlock;
580 }
581
582 man->cur->cb_header->length = man->cur_pos;
583 vmw_cmdbuf_ctx_add(man, man->cur, SVGA_CB_CONTEXT_0);
584out_unlock:
585 spin_unlock_bh(&man->lock);
586 man->cur = NULL;
587 man->cur_pos = 0;
588}
589
590/**
591 * vmw_cmdbuf_cur_flush - Flush the current command buffer for small kernel
592 * command submissions
593 *
594 * @man: The command buffer manager.
595 * @interruptible: Whether to sleep interruptible when sleeping.
596 *
597 * Flushes the current command buffer without allocating a new one. A new one
598 * is automatically allocated when needed.
599 */
600int vmw_cmdbuf_cur_flush(struct vmw_cmdbuf_man *man,
601 bool interruptible)
602{
603 int ret = vmw_cmdbuf_cur_lock(man, interruptible);
604
605 if (ret)
606 return ret;
607
608 __vmw_cmdbuf_cur_flush(man);
609 vmw_cmdbuf_cur_unlock(man);
610
611 return 0;
612}
613
614/**
615 * vmw_cmdbuf_idle - Wait for command buffer manager idle.
616 *
617 * @man: The command buffer manager.
618 * @interruptible: Sleep interruptible while waiting.
619 * @timeout: Time out after this many ticks.
620 *
621 * Wait until the command buffer manager has processed all command buffers,
622 * or until a timeout occurs. If a timeout occurs, the function will return
623 * -EBUSY.
624 */
625int vmw_cmdbuf_idle(struct vmw_cmdbuf_man *man, bool interruptible,
626 unsigned long timeout)
627{
628 int ret;
629
630 ret = vmw_cmdbuf_cur_flush(man, interruptible);
631 vmw_generic_waiter_add(man->dev_priv,
632 SVGA_IRQFLAG_COMMAND_BUFFER,
633 &man->dev_priv->cmdbuf_waiters);
634
635 if (interruptible) {
636 ret = wait_event_interruptible_timeout
637 (man->idle_queue, vmw_cmdbuf_man_idle(man, true),
638 timeout);
639 } else {
640 ret = wait_event_timeout
641 (man->idle_queue, vmw_cmdbuf_man_idle(man, true),
642 timeout);
643 }
644 vmw_generic_waiter_remove(man->dev_priv,
645 SVGA_IRQFLAG_COMMAND_BUFFER,
646 &man->dev_priv->cmdbuf_waiters);
647 if (ret == 0) {
648 if (!vmw_cmdbuf_man_idle(man, true))
649 ret = -EBUSY;
650 else
651 ret = 0;
652 }
653 if (ret > 0)
654 ret = 0;
655
656 return ret;
657}
658
659/**
660 * vmw_cmdbuf_try_alloc - Try to allocate buffer space from the main pool.
661 *
662 * @man: The command buffer manager.
663 * @info: Allocation info. Will hold the size on entry and allocated mm node
664 * on successful return.
665 *
666 * Try to allocate buffer space from the main pool. Returns true if succeeded.
667 * If a fatal error was hit, the error code is returned in @info->ret.
668 */
669static bool vmw_cmdbuf_try_alloc(struct vmw_cmdbuf_man *man,
670 struct vmw_cmdbuf_alloc_info *info)
671{
672 int ret;
673
674 if (info->done)
675 return true;
676
677 memset(info->node, 0, sizeof(*info->node));
678 spin_lock_bh(&man->lock);
679 ret = drm_mm_insert_node_generic(&man->mm, info->node, info->page_size,
680 0, 0,
681 DRM_MM_SEARCH_DEFAULT,
682 DRM_MM_CREATE_DEFAULT);
683 if (ret) {
684 vmw_cmdbuf_man_process(man);
685 ret = drm_mm_insert_node_generic(&man->mm, info->node,
686 info->page_size, 0, 0,
687 DRM_MM_SEARCH_DEFAULT,
688 DRM_MM_CREATE_DEFAULT);
689 }
690
691 spin_unlock_bh(&man->lock);
692 info->done = !ret;
693
694 return info->done;
695}
696
697/**
698 * vmw_cmdbuf_alloc_space - Allocate buffer space from the main pool.
699 *
700 * @man: The command buffer manager.
701 * @node: Pointer to pre-allocated range-manager node.
702 * @size: The size of the allocation.
703 * @interruptible: Whether to sleep interruptible while waiting for space.
704 *
705 * This function allocates buffer space from the main pool, and if there is
706 * no space available ATM, it turns on IRQ handling and sleeps waiting for it to
707 * become available.
708 */
709static int vmw_cmdbuf_alloc_space(struct vmw_cmdbuf_man *man,
710 struct drm_mm_node *node,
711 size_t size,
712 bool interruptible)
713{
714 struct vmw_cmdbuf_alloc_info info;
715
716 info.page_size = PAGE_ALIGN(size) >> PAGE_SHIFT;
717 info.node = node;
718 info.done = false;
719
720 /*
721 * To prevent starvation of large requests, only one allocating call
722 * at a time waiting for space.
723 */
724 if (interruptible) {
725 if (mutex_lock_interruptible(&man->space_mutex))
726 return -ERESTARTSYS;
727 } else {
728 mutex_lock(&man->space_mutex);
729 }
730
731 /* Try to allocate space without waiting. */
732 if (vmw_cmdbuf_try_alloc(man, &info))
733 goto out_unlock;
734
735 vmw_generic_waiter_add(man->dev_priv,
736 SVGA_IRQFLAG_COMMAND_BUFFER,
737 &man->dev_priv->cmdbuf_waiters);
738
739 if (interruptible) {
740 int ret;
741
742 ret = wait_event_interruptible
743 (man->alloc_queue, vmw_cmdbuf_try_alloc(man, &info));
744 if (ret) {
745 vmw_generic_waiter_remove
746 (man->dev_priv, SVGA_IRQFLAG_COMMAND_BUFFER,
747 &man->dev_priv->cmdbuf_waiters);
748 mutex_unlock(&man->space_mutex);
749 return ret;
750 }
751 } else {
752 wait_event(man->alloc_queue, vmw_cmdbuf_try_alloc(man, &info));
753 }
754 vmw_generic_waiter_remove(man->dev_priv,
755 SVGA_IRQFLAG_COMMAND_BUFFER,
756 &man->dev_priv->cmdbuf_waiters);
757
758out_unlock:
759 mutex_unlock(&man->space_mutex);
760
761 return 0;
762}
763
764/**
765 * vmw_cmdbuf_space_pool - Set up a command buffer header with command buffer
766 * space from the main pool.
767 *
768 * @man: The command buffer manager.
769 * @header: Pointer to the header to set up.
770 * @size: The requested size of the buffer space.
771 * @interruptible: Whether to sleep interruptible while waiting for space.
772 */
773static int vmw_cmdbuf_space_pool(struct vmw_cmdbuf_man *man,
774 struct vmw_cmdbuf_header *header,
775 size_t size,
776 bool interruptible)
777{
778 SVGACBHeader *cb_hdr;
779 size_t offset;
780 int ret;
781
782 if (!man->has_pool)
783 return -ENOMEM;
784
785 ret = vmw_cmdbuf_alloc_space(man, &header->node, size, interruptible);
786
787 if (ret)
788 return ret;
789
790 header->cb_header = dma_pool_alloc(man->headers, GFP_KERNEL,
791 &header->handle);
792 if (!header->cb_header) {
793 ret = -ENOMEM;
794 goto out_no_cb_header;
795 }
796
797 header->size = header->node.size << PAGE_SHIFT;
798 cb_hdr = header->cb_header;
799 offset = header->node.start << PAGE_SHIFT;
800 header->cmd = man->map + offset;
801 memset(cb_hdr, 0, sizeof(*cb_hdr));
802 if (man->using_mob) {
803 cb_hdr->flags = SVGA_CB_FLAG_MOB;
804 cb_hdr->ptr.mob.mobid = man->cmd_space->mem.start;
805 cb_hdr->ptr.mob.mobOffset = offset;
806 } else {
807 cb_hdr->ptr.pa = (u64)man->handle + (u64)offset;
808 }
809
810 return 0;
811
812out_no_cb_header:
813 spin_lock_bh(&man->lock);
814 drm_mm_remove_node(&header->node);
815 spin_unlock_bh(&man->lock);
816
817 return ret;
818}
819
820/**
821 * vmw_cmdbuf_space_inline - Set up a command buffer header with
822 * inline command buffer space.
823 *
824 * @man: The command buffer manager.
825 * @header: Pointer to the header to set up.
826 * @size: The requested size of the buffer space.
827 */
828static int vmw_cmdbuf_space_inline(struct vmw_cmdbuf_man *man,
829 struct vmw_cmdbuf_header *header,
830 int size)
831{
832 struct vmw_cmdbuf_dheader *dheader;
833 SVGACBHeader *cb_hdr;
834
835 if (WARN_ON_ONCE(size > VMW_CMDBUF_INLINE_SIZE))
836 return -ENOMEM;
837
838 dheader = dma_pool_alloc(man->dheaders, GFP_KERNEL,
839 &header->handle);
840 if (!dheader)
841 return -ENOMEM;
842
843 header->inline_space = true;
844 header->size = VMW_CMDBUF_INLINE_SIZE;
845 cb_hdr = &dheader->cb_header;
846 header->cb_header = cb_hdr;
847 header->cmd = dheader->cmd;
848 memset(dheader, 0, sizeof(*dheader));
849 cb_hdr->status = SVGA_CB_STATUS_NONE;
850 cb_hdr->flags = SVGA_CB_FLAG_NONE;
851 cb_hdr->ptr.pa = (u64)header->handle +
852 (u64)offsetof(struct vmw_cmdbuf_dheader, cmd);
853
854 return 0;
855}
856
857/**
858 * vmw_cmdbuf_alloc - Allocate a command buffer header complete with
859 * command buffer space.
860 *
861 * @man: The command buffer manager.
862 * @size: The requested size of the buffer space.
863 * @interruptible: Whether to sleep interruptible while waiting for space.
864 * @p_header: points to a header pointer to populate on successful return.
865 *
866 * Returns a pointer to command buffer space if successful. Otherwise
867 * returns an error pointer. The header pointer returned in @p_header should
868 * be used for upcoming calls to vmw_cmdbuf_reserve() and vmw_cmdbuf_commit().
869 */
870void *vmw_cmdbuf_alloc(struct vmw_cmdbuf_man *man,
871 size_t size, bool interruptible,
872 struct vmw_cmdbuf_header **p_header)
873{
874 struct vmw_cmdbuf_header *header;
875 int ret = 0;
876
877 *p_header = NULL;
878
879 header = kzalloc(sizeof(*header), GFP_KERNEL);
880 if (!header)
881 return ERR_PTR(-ENOMEM);
882
883 if (size <= VMW_CMDBUF_INLINE_SIZE)
884 ret = vmw_cmdbuf_space_inline(man, header, size);
885 else
886 ret = vmw_cmdbuf_space_pool(man, header, size, interruptible);
887
888 if (ret) {
889 kfree(header);
890 return ERR_PTR(ret);
891 }
892
893 header->man = man;
894 INIT_LIST_HEAD(&header->list);
895 header->cb_header->status = SVGA_CB_STATUS_NONE;
896 *p_header = header;
897
898 return header->cmd;
899}
900
901/**
902 * vmw_cmdbuf_reserve_cur - Reserve space for commands in the current
903 * command buffer.
904 *
905 * @man: The command buffer manager.
906 * @size: The requested size of the commands.
907 * @ctx_id: The context id if any. Otherwise set to SVGA3D_REG_INVALID.
908 * @interruptible: Whether to sleep interruptible while waiting for space.
909 *
910 * Returns a pointer to command buffer space if successful. Otherwise
911 * returns an error pointer.
912 */
913static void *vmw_cmdbuf_reserve_cur(struct vmw_cmdbuf_man *man,
914 size_t size,
915 int ctx_id,
916 bool interruptible)
917{
918 struct vmw_cmdbuf_header *cur;
919 void *ret;
920
921 if (vmw_cmdbuf_cur_lock(man, interruptible))
922 return ERR_PTR(-ERESTARTSYS);
923
924 cur = man->cur;
925 if (cur && (size + man->cur_pos > cur->size ||
926 ((cur->cb_header->flags & SVGA_CB_FLAG_DX_CONTEXT) &&
927 ctx_id != cur->cb_header->dxContext)))
928 __vmw_cmdbuf_cur_flush(man);
929
930 if (!man->cur) {
931 ret = vmw_cmdbuf_alloc(man,
932 max_t(size_t, size, man->default_size),
933 interruptible, &man->cur);
934 if (IS_ERR(ret)) {
935 vmw_cmdbuf_cur_unlock(man);
936 return ret;
937 }
938
939 cur = man->cur;
940 }
941
942 if (ctx_id != SVGA3D_INVALID_ID) {
943 cur->cb_header->flags |= SVGA_CB_FLAG_DX_CONTEXT;
944 cur->cb_header->dxContext = ctx_id;
945 }
946
947 cur->reserved = size;
948
949 return (void *) (man->cur->cmd + man->cur_pos);
950}
951
952/**
953 * vmw_cmdbuf_commit_cur - Commit commands in the current command buffer.
954 *
955 * @man: The command buffer manager.
956 * @size: The size of the commands actually written.
957 * @flush: Whether to flush the command buffer immediately.
958 */
959static void vmw_cmdbuf_commit_cur(struct vmw_cmdbuf_man *man,
960 size_t size, bool flush)
961{
962 struct vmw_cmdbuf_header *cur = man->cur;
963
964 WARN_ON(!mutex_is_locked(&man->cur_mutex));
965
966 WARN_ON(size > cur->reserved);
967 man->cur_pos += size;
968 if (!size)
969 cur->cb_header->flags &= ~SVGA_CB_FLAG_DX_CONTEXT;
970 if (flush)
971 __vmw_cmdbuf_cur_flush(man);
972 vmw_cmdbuf_cur_unlock(man);
973}
974
975/**
976 * vmw_cmdbuf_reserve - Reserve space for commands in a command buffer.
977 *
978 * @man: The command buffer manager.
979 * @size: The requested size of the commands.
980 * @ctx_id: The context id if any. Otherwise set to SVGA3D_REG_INVALID.
981 * @interruptible: Whether to sleep interruptible while waiting for space.
982 * @header: Header of the command buffer. NULL if the current command buffer
983 * should be used.
984 *
985 * Returns a pointer to command buffer space if successful. Otherwise
986 * returns an error pointer.
987 */
988void *vmw_cmdbuf_reserve(struct vmw_cmdbuf_man *man, size_t size,
989 int ctx_id, bool interruptible,
990 struct vmw_cmdbuf_header *header)
991{
992 if (!header)
993 return vmw_cmdbuf_reserve_cur(man, size, ctx_id, interruptible);
994
995 if (size > header->size)
996 return ERR_PTR(-EINVAL);
997
998 if (ctx_id != SVGA3D_INVALID_ID) {
999 header->cb_header->flags |= SVGA_CB_FLAG_DX_CONTEXT;
1000 header->cb_header->dxContext = ctx_id;
1001 }
1002
1003 header->reserved = size;
1004 return header->cmd;
1005}
1006
1007/**
1008 * vmw_cmdbuf_commit - Commit commands in a command buffer.
1009 *
1010 * @man: The command buffer manager.
1011 * @size: The size of the commands actually written.
1012 * @header: Header of the command buffer. NULL if the current command buffer
1013 * should be used.
1014 * @flush: Whether to flush the command buffer immediately.
1015 */
1016void vmw_cmdbuf_commit(struct vmw_cmdbuf_man *man, size_t size,
1017 struct vmw_cmdbuf_header *header, bool flush)
1018{
1019 if (!header) {
1020 vmw_cmdbuf_commit_cur(man, size, flush);
1021 return;
1022 }
1023
1024 (void) vmw_cmdbuf_cur_lock(man, false);
1025 __vmw_cmdbuf_cur_flush(man);
1026 WARN_ON(size > header->reserved);
1027 man->cur = header;
1028 man->cur_pos = size;
1029 if (!size)
1030 header->cb_header->flags &= ~SVGA_CB_FLAG_DX_CONTEXT;
1031 if (flush)
1032 __vmw_cmdbuf_cur_flush(man);
1033 vmw_cmdbuf_cur_unlock(man);
1034}
1035
1036/**
1037 * vmw_cmdbuf_tasklet_schedule - Schedule the interrupt handler bottom half.
1038 *
1039 * @man: The command buffer manager.
1040 */
1041void vmw_cmdbuf_tasklet_schedule(struct vmw_cmdbuf_man *man)
1042{
1043 if (!man)
1044 return;
1045
1046 tasklet_schedule(&man->tasklet);
1047}
1048
1049/**
1050 * vmw_cmdbuf_send_device_command - Send a command through the device context.
1051 *
1052 * @man: The command buffer manager.
1053 * @command: Pointer to the command to send.
1054 * @size: Size of the command.
1055 *
1056 * Synchronously sends a device context command.
1057 */
1058static int vmw_cmdbuf_send_device_command(struct vmw_cmdbuf_man *man,
1059 const void *command,
1060 size_t size)
1061{
1062 struct vmw_cmdbuf_header *header;
1063 int status;
1064 void *cmd = vmw_cmdbuf_alloc(man, size, false, &header);
1065
1066 if (IS_ERR(cmd))
1067 return PTR_ERR(cmd);
1068
1069 memcpy(cmd, command, size);
1070 header->cb_header->length = size;
1071 header->cb_context = SVGA_CB_CONTEXT_DEVICE;
1072 spin_lock_bh(&man->lock);
1073 status = vmw_cmdbuf_header_submit(header);
1074 spin_unlock_bh(&man->lock);
1075 vmw_cmdbuf_header_free(header);
1076
1077 if (status != SVGA_CB_STATUS_COMPLETED) {
1078 DRM_ERROR("Device context command failed with status %d\n",
1079 status);
1080 return -EINVAL;
1081 }
1082
1083 return 0;
1084}
1085
1086/**
1087 * vmw_cmdbuf_startstop - Send a start / stop command through the device
1088 * context.
1089 *
1090 * @man: The command buffer manager.
1091 * @enable: Whether to enable or disable the context.
1092 *
1093 * Synchronously sends a device start / stop context command.
1094 */
1095static int vmw_cmdbuf_startstop(struct vmw_cmdbuf_man *man,
1096 bool enable)
1097{
1098 struct {
1099 uint32 id;
1100 SVGADCCmdStartStop body;
1101 } __packed cmd;
1102
1103 cmd.id = SVGA_DC_CMD_START_STOP_CONTEXT;
1104 cmd.body.enable = (enable) ? 1 : 0;
1105 cmd.body.context = SVGA_CB_CONTEXT_0;
1106
1107 return vmw_cmdbuf_send_device_command(man, &cmd, sizeof(cmd));
1108}
1109
1110/**
1111 * vmw_cmdbuf_set_pool_size - Set command buffer manager sizes
1112 *
1113 * @man: The command buffer manager.
1114 * @size: The size of the main space pool.
1115 * @default_size: The default size of the command buffer for small kernel
1116 * submissions.
1117 *
1118 * Set the size and allocate the main command buffer space pool,
1119 * as well as the default size of the command buffer for
1120 * small kernel submissions. If successful, this enables large command
1121 * submissions. Note that this function requires that rudimentary command
1122 * submission is already available and that the MOB memory manager is alive.
1123 * Returns 0 on success. Negative error code on failure.
1124 */
1125int vmw_cmdbuf_set_pool_size(struct vmw_cmdbuf_man *man,
1126 size_t size, size_t default_size)
1127{
1128 struct vmw_private *dev_priv = man->dev_priv;
1129 bool dummy;
1130 int ret;
1131
1132 if (man->has_pool)
1133 return -EINVAL;
1134
1135 /* First, try to allocate a huge chunk of DMA memory */
1136 size = PAGE_ALIGN(size);
1137 man->map = dma_alloc_coherent(&dev_priv->dev->pdev->dev, size,
1138 &man->handle, GFP_KERNEL);
1139 if (man->map) {
1140 man->using_mob = false;
1141 } else {
1142 /*
1143 * DMA memory failed. If we can have command buffers in a
1144 * MOB, try to use that instead. Note that this will
1145 * actually call into the already enabled manager, when
1146 * binding the MOB.
1147 */
1148 if (!(dev_priv->capabilities & SVGA_CAP_DX))
1149 return -ENOMEM;
1150
1151 ret = ttm_bo_create(&dev_priv->bdev, size, ttm_bo_type_device,
1152 &vmw_mob_ne_placement, 0, false, NULL,
1153 &man->cmd_space);
1154 if (ret)
1155 return ret;
1156
1157 man->using_mob = true;
1158 ret = ttm_bo_kmap(man->cmd_space, 0, size >> PAGE_SHIFT,
1159 &man->map_obj);
1160 if (ret)
1161 goto out_no_map;
1162
1163 man->map = ttm_kmap_obj_virtual(&man->map_obj, &dummy);
1164 }
1165
1166 man->size = size;
1167 drm_mm_init(&man->mm, 0, size >> PAGE_SHIFT);
1168
1169 man->has_pool = true;
1170
1171 /*
1172 * For now, set the default size to VMW_CMDBUF_INLINE_SIZE to
1173 * prevent deadlocks from happening when vmw_cmdbuf_space_pool()
1174 * needs to wait for space and we block on further command
1175 * submissions to be able to free up space.
1176 */
1177 man->default_size = VMW_CMDBUF_INLINE_SIZE;
1178 DRM_INFO("Using command buffers with %s pool.\n",
1179 (man->using_mob) ? "MOB" : "DMA");
1180
1181 return 0;
1182
1183out_no_map:
1184 if (man->using_mob)
1185 ttm_bo_unref(&man->cmd_space);
1186
1187 return ret;
1188}
1189
1190/**
1191 * vmw_cmdbuf_man_create: Create a command buffer manager and enable it for
1192 * inline command buffer submissions only.
1193 *
1194 * @dev_priv: Pointer to device private structure.
1195 *
1196 * Returns a pointer to a cummand buffer manager to success or error pointer
1197 * on failure. The command buffer manager will be enabled for submissions of
1198 * size VMW_CMDBUF_INLINE_SIZE only.
1199 */
1200struct vmw_cmdbuf_man *vmw_cmdbuf_man_create(struct vmw_private *dev_priv)
1201{
1202 struct vmw_cmdbuf_man *man;
1203 struct vmw_cmdbuf_context *ctx;
1204 int i;
1205 int ret;
1206
1207 if (!(dev_priv->capabilities & SVGA_CAP_COMMAND_BUFFERS))
1208 return ERR_PTR(-ENOSYS);
1209
1210 man = kzalloc(sizeof(*man), GFP_KERNEL);
1211 if (!man)
1212 return ERR_PTR(-ENOMEM);
1213
1214 man->headers = dma_pool_create("vmwgfx cmdbuf",
1215 &dev_priv->dev->pdev->dev,
1216 sizeof(SVGACBHeader),
1217 64, PAGE_SIZE);
1218 if (!man->headers) {
1219 ret = -ENOMEM;
1220 goto out_no_pool;
1221 }
1222
1223 man->dheaders = dma_pool_create("vmwgfx inline cmdbuf",
1224 &dev_priv->dev->pdev->dev,
1225 sizeof(struct vmw_cmdbuf_dheader),
1226 64, PAGE_SIZE);
1227 if (!man->dheaders) {
1228 ret = -ENOMEM;
1229 goto out_no_dpool;
1230 }
1231
1232 for_each_cmdbuf_ctx(man, i, ctx)
1233 vmw_cmdbuf_ctx_init(ctx);
1234
1235 INIT_LIST_HEAD(&man->error);
1236 spin_lock_init(&man->lock);
1237 mutex_init(&man->cur_mutex);
1238 mutex_init(&man->space_mutex);
1239 tasklet_init(&man->tasklet, vmw_cmdbuf_man_tasklet,
1240 (unsigned long) man);
1241 man->default_size = VMW_CMDBUF_INLINE_SIZE;
1242 init_waitqueue_head(&man->alloc_queue);
1243 init_waitqueue_head(&man->idle_queue);
1244 man->dev_priv = dev_priv;
1245 man->max_hw_submitted = SVGA_CB_MAX_QUEUED_PER_CONTEXT - 1;
1246 INIT_WORK(&man->work, &vmw_cmdbuf_work_func);
1247 vmw_generic_waiter_add(dev_priv, SVGA_IRQFLAG_ERROR,
1248 &dev_priv->error_waiters);
1249 ret = vmw_cmdbuf_startstop(man, true);
1250 if (ret) {
1251 DRM_ERROR("Failed starting command buffer context 0.\n");
1252 vmw_cmdbuf_man_destroy(man);
1253 return ERR_PTR(ret);
1254 }
1255
1256 return man;
1257
1258out_no_dpool:
1259 dma_pool_destroy(man->headers);
1260out_no_pool:
1261 kfree(man);
1262
1263 return ERR_PTR(ret);
1264}
1265
1266/**
1267 * vmw_cmdbuf_remove_pool - Take down the main buffer space pool.
1268 *
1269 * @man: Pointer to a command buffer manager.
1270 *
1271 * This function removes the main buffer space pool, and should be called
1272 * before MOB memory management is removed. When this function has been called,
1273 * only small command buffer submissions of size VMW_CMDBUF_INLINE_SIZE or
1274 * less are allowed, and the default size of the command buffer for small kernel
1275 * submissions is also set to this size.
1276 */
1277void vmw_cmdbuf_remove_pool(struct vmw_cmdbuf_man *man)
1278{
1279 if (!man->has_pool)
1280 return;
1281
1282 man->has_pool = false;
1283 man->default_size = VMW_CMDBUF_INLINE_SIZE;
1284 (void) vmw_cmdbuf_idle(man, false, 10*HZ);
1285 if (man->using_mob) {
1286 (void) ttm_bo_kunmap(&man->map_obj);
1287 ttm_bo_unref(&man->cmd_space);
1288 } else {
1289 dma_free_coherent(&man->dev_priv->dev->pdev->dev,
1290 man->size, man->map, man->handle);
1291 }
1292}
1293
1294/**
1295 * vmw_cmdbuf_man_destroy - Take down a command buffer manager.
1296 *
1297 * @man: Pointer to a command buffer manager.
1298 *
1299 * This function idles and then destroys a command buffer manager.
1300 */
1301void vmw_cmdbuf_man_destroy(struct vmw_cmdbuf_man *man)
1302{
1303 WARN_ON_ONCE(man->has_pool);
1304 (void) vmw_cmdbuf_idle(man, false, 10*HZ);
1305 if (vmw_cmdbuf_startstop(man, false))
1306 DRM_ERROR("Failed stopping command buffer context 0.\n");
1307
1308 vmw_generic_waiter_remove(man->dev_priv, SVGA_IRQFLAG_ERROR,
1309 &man->dev_priv->error_waiters);
1310 tasklet_kill(&man->tasklet);
1311 (void) cancel_work_sync(&man->work);
1312 dma_pool_destroy(man->dheaders);
1313 dma_pool_destroy(man->headers);
1314 mutex_destroy(&man->cur_mutex);
1315 mutex_destroy(&man->space_mutex);
1316 kfree(man);
1317}
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 * @block_submission: Identifies a block command submission.
52 */
53struct vmw_cmdbuf_context {
54 struct list_head submitted;
55 struct list_head hw_submitted;
56 struct list_head preempted;
57 unsigned num_hw_submitted;
58 bool block_submission;
59};
60
61/**
62 * struct vmw_cmdbuf_man - Command buffer manager
63 *
64 * @cur_mutex: Mutex protecting the command buffer used for incremental small
65 * kernel command submissions, @cur.
66 * @space_mutex: Mutex to protect against starvation when we allocate
67 * main pool buffer space.
68 * @error_mutex: Mutex to serialize the work queue error handling.
69 * Note this is not needed if the same workqueue handler
70 * can't race with itself...
71 * @work: A struct work_struct implementeing command buffer error handling.
72 * Immutable.
73 * @dev_priv: Pointer to the device private struct. Immutable.
74 * @ctx: Array of command buffer context queues. The queues and the context
75 * data is protected by @lock.
76 * @error: List of command buffers that have caused device errors.
77 * Protected by @lock.
78 * @mm: Range manager for the command buffer space. Manager allocations and
79 * frees are protected by @lock.
80 * @cmd_space: Buffer object for the command buffer space, unless we were
81 * able to make a contigous coherent DMA memory allocation, @handle. Immutable.
82 * @map_obj: Mapping state for @cmd_space. 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 ttm_buffer_object *cmd_space;
120 struct ttm_bo_kmap_obj map_obj;
121 u8 *map;
122 struct vmw_cmdbuf_header *cur;
123 size_t cur_pos;
124 size_t default_size;
125 unsigned max_hw_submitted;
126 spinlock_t lock;
127 struct dma_pool *headers;
128 struct dma_pool *dheaders;
129 wait_queue_head_t alloc_queue;
130 wait_queue_head_t idle_queue;
131 bool irq_on;
132 bool using_mob;
133 bool has_pool;
134 dma_addr_t handle;
135 size_t size;
136 u32 num_contexts;
137};
138
139/**
140 * struct vmw_cmdbuf_header - Command buffer metadata
141 *
142 * @man: The command buffer manager.
143 * @cb_header: Device command buffer header, allocated from a DMA pool.
144 * @cb_context: The device command buffer context.
145 * @list: List head for attaching to the manager lists.
146 * @node: The range manager node.
147 * @handle: The DMA address of @cb_header. Handed to the device on command
148 * buffer submission.
149 * @cmd: Pointer to the command buffer space of this buffer.
150 * @size: Size of the command buffer space of this buffer.
151 * @reserved: Reserved space of this buffer.
152 * @inline_space: Whether inline command buffer space is used.
153 */
154struct vmw_cmdbuf_header {
155 struct vmw_cmdbuf_man *man;
156 SVGACBHeader *cb_header;
157 SVGACBContext cb_context;
158 struct list_head list;
159 struct drm_mm_node node;
160 dma_addr_t handle;
161 u8 *cmd;
162 size_t size;
163 size_t reserved;
164 bool inline_space;
165};
166
167/**
168 * struct vmw_cmdbuf_dheader - Device command buffer header with inline
169 * command buffer space.
170 *
171 * @cb_header: Device command buffer header.
172 * @cmd: Inline command buffer space.
173 */
174struct vmw_cmdbuf_dheader {
175 SVGACBHeader cb_header;
176 u8 cmd[VMW_CMDBUF_INLINE_SIZE] __aligned(VMW_CMDBUF_INLINE_ALIGN);
177};
178
179/**
180 * struct vmw_cmdbuf_alloc_info - Command buffer space allocation metadata
181 *
182 * @page_size: Size of requested command buffer space in pages.
183 * @node: Pointer to the range manager node.
184 * @done: True if this allocation has succeeded.
185 */
186struct vmw_cmdbuf_alloc_info {
187 size_t page_size;
188 struct drm_mm_node *node;
189 bool done;
190};
191
192/* Loop over each context in the command buffer manager. */
193#define for_each_cmdbuf_ctx(_man, _i, _ctx) \
194 for (_i = 0, _ctx = &(_man)->ctx[0]; (_i) < (_man)->num_contexts; \
195 ++(_i), ++(_ctx))
196
197static int vmw_cmdbuf_startstop(struct vmw_cmdbuf_man *man, u32 context,
198 bool enable);
199static int vmw_cmdbuf_preempt(struct vmw_cmdbuf_man *man, u32 context);
200
201/**
202 * vmw_cmdbuf_cur_lock - Helper to lock the cur_mutex.
203 *
204 * @man: The range manager.
205 * @interruptible: Whether to wait interruptible when locking.
206 */
207static int vmw_cmdbuf_cur_lock(struct vmw_cmdbuf_man *man, bool interruptible)
208{
209 if (interruptible) {
210 if (mutex_lock_interruptible(&man->cur_mutex))
211 return -ERESTARTSYS;
212 } else {
213 mutex_lock(&man->cur_mutex);
214 }
215
216 return 0;
217}
218
219/**
220 * vmw_cmdbuf_cur_unlock - Helper to unlock the cur_mutex.
221 *
222 * @man: The range manager.
223 */
224static void vmw_cmdbuf_cur_unlock(struct vmw_cmdbuf_man *man)
225{
226 mutex_unlock(&man->cur_mutex);
227}
228
229/**
230 * vmw_cmdbuf_header_inline_free - Free a struct vmw_cmdbuf_header that has
231 * been used for the device context with inline command buffers.
232 * Need not be called locked.
233 *
234 * @header: Pointer to the header to free.
235 */
236static void vmw_cmdbuf_header_inline_free(struct vmw_cmdbuf_header *header)
237{
238 struct vmw_cmdbuf_dheader *dheader;
239
240 if (WARN_ON_ONCE(!header->inline_space))
241 return;
242
243 dheader = container_of(header->cb_header, struct vmw_cmdbuf_dheader,
244 cb_header);
245 dma_pool_free(header->man->dheaders, dheader, header->handle);
246 kfree(header);
247}
248
249/**
250 * __vmw_cmdbuf_header_free - Free a struct vmw_cmdbuf_header and its
251 * associated structures.
252 *
253 * @header: Pointer to the header to free.
254 *
255 * For internal use. Must be called with man::lock held.
256 */
257static void __vmw_cmdbuf_header_free(struct vmw_cmdbuf_header *header)
258{
259 struct vmw_cmdbuf_man *man = header->man;
260
261 lockdep_assert_held_once(&man->lock);
262
263 if (header->inline_space) {
264 vmw_cmdbuf_header_inline_free(header);
265 return;
266 }
267
268 drm_mm_remove_node(&header->node);
269 wake_up_all(&man->alloc_queue);
270 if (header->cb_header)
271 dma_pool_free(man->headers, header->cb_header,
272 header->handle);
273 kfree(header);
274}
275
276/**
277 * vmw_cmdbuf_header_free - Free a struct vmw_cmdbuf_header and its
278 * associated structures.
279 *
280 * @header: Pointer to the header to free.
281 */
282void vmw_cmdbuf_header_free(struct vmw_cmdbuf_header *header)
283{
284 struct vmw_cmdbuf_man *man = header->man;
285
286 /* Avoid locking if inline_space */
287 if (header->inline_space) {
288 vmw_cmdbuf_header_inline_free(header);
289 return;
290 }
291 spin_lock(&man->lock);
292 __vmw_cmdbuf_header_free(header);
293 spin_unlock(&man->lock);
294}
295
296
297/**
298 * vmw_cmdbuf_header_submit: Submit a command buffer to hardware.
299 *
300 * @header: The header of the buffer to submit.
301 */
302static int vmw_cmdbuf_header_submit(struct vmw_cmdbuf_header *header)
303{
304 struct vmw_cmdbuf_man *man = header->man;
305 u32 val;
306
307 val = upper_32_bits(header->handle);
308 vmw_write(man->dev_priv, SVGA_REG_COMMAND_HIGH, val);
309
310 val = lower_32_bits(header->handle);
311 val |= header->cb_context & SVGA_CB_CONTEXT_MASK;
312 vmw_write(man->dev_priv, SVGA_REG_COMMAND_LOW, val);
313
314 return header->cb_header->status;
315}
316
317/**
318 * vmw_cmdbuf_ctx_init: Initialize a command buffer context.
319 *
320 * @ctx: The command buffer context to initialize
321 */
322static void vmw_cmdbuf_ctx_init(struct vmw_cmdbuf_context *ctx)
323{
324 INIT_LIST_HEAD(&ctx->hw_submitted);
325 INIT_LIST_HEAD(&ctx->submitted);
326 INIT_LIST_HEAD(&ctx->preempted);
327 ctx->num_hw_submitted = 0;
328}
329
330/**
331 * vmw_cmdbuf_ctx_submit: Submit command buffers from a command buffer
332 * context.
333 *
334 * @man: The command buffer manager.
335 * @ctx: The command buffer context.
336 *
337 * Submits command buffers to hardware until there are no more command
338 * buffers to submit or the hardware can't handle more command buffers.
339 */
340static void vmw_cmdbuf_ctx_submit(struct vmw_cmdbuf_man *man,
341 struct vmw_cmdbuf_context *ctx)
342{
343 while (ctx->num_hw_submitted < man->max_hw_submitted &&
344 !list_empty(&ctx->submitted) &&
345 !ctx->block_submission) {
346 struct vmw_cmdbuf_header *entry;
347 SVGACBStatus status;
348
349 entry = list_first_entry(&ctx->submitted,
350 struct vmw_cmdbuf_header,
351 list);
352
353 status = vmw_cmdbuf_header_submit(entry);
354
355 /* This should never happen */
356 if (WARN_ON_ONCE(status == SVGA_CB_STATUS_QUEUE_FULL)) {
357 entry->cb_header->status = SVGA_CB_STATUS_NONE;
358 break;
359 }
360
361 list_del(&entry->list);
362 list_add_tail(&entry->list, &ctx->hw_submitted);
363 ctx->num_hw_submitted++;
364 }
365
366}
367
368/**
369 * vmw_cmdbuf_ctx_process - Process a command buffer context.
370 *
371 * @man: The command buffer manager.
372 * @ctx: The command buffer context.
373 * @notempty: Pass back count of non-empty command submitted lists.
374 *
375 * Submit command buffers to hardware if possible, and process finished
376 * buffers. Typically freeing them, but on preemption or error take
377 * appropriate action. Wake up waiters if appropriate.
378 */
379static void vmw_cmdbuf_ctx_process(struct vmw_cmdbuf_man *man,
380 struct vmw_cmdbuf_context *ctx,
381 int *notempty)
382{
383 struct vmw_cmdbuf_header *entry, *next;
384
385 vmw_cmdbuf_ctx_submit(man, ctx);
386
387 list_for_each_entry_safe(entry, next, &ctx->hw_submitted, list) {
388 SVGACBStatus status = entry->cb_header->status;
389
390 if (status == SVGA_CB_STATUS_NONE)
391 break;
392
393 list_del(&entry->list);
394 wake_up_all(&man->idle_queue);
395 ctx->num_hw_submitted--;
396 switch (status) {
397 case SVGA_CB_STATUS_COMPLETED:
398 __vmw_cmdbuf_header_free(entry);
399 break;
400 case SVGA_CB_STATUS_COMMAND_ERROR:
401 WARN_ONCE(true, "Command buffer error.\n");
402 entry->cb_header->status = SVGA_CB_STATUS_NONE;
403 list_add_tail(&entry->list, &man->error);
404 schedule_work(&man->work);
405 break;
406 case SVGA_CB_STATUS_PREEMPTED:
407 entry->cb_header->status = SVGA_CB_STATUS_NONE;
408 list_add_tail(&entry->list, &ctx->preempted);
409 break;
410 case SVGA_CB_STATUS_CB_HEADER_ERROR:
411 WARN_ONCE(true, "Command buffer header error.\n");
412 __vmw_cmdbuf_header_free(entry);
413 break;
414 default:
415 WARN_ONCE(true, "Undefined command buffer status.\n");
416 __vmw_cmdbuf_header_free(entry);
417 break;
418 }
419 }
420
421 vmw_cmdbuf_ctx_submit(man, ctx);
422 if (!list_empty(&ctx->submitted))
423 (*notempty)++;
424}
425
426/**
427 * vmw_cmdbuf_man_process - Process all command buffer contexts and
428 * switch on and off irqs as appropriate.
429 *
430 * @man: The command buffer manager.
431 *
432 * Calls vmw_cmdbuf_ctx_process() on all contexts. If any context has
433 * command buffers left that are not submitted to hardware, Make sure
434 * IRQ handling is turned on. Otherwise, make sure it's turned off.
435 */
436static void vmw_cmdbuf_man_process(struct vmw_cmdbuf_man *man)
437{
438 int notempty;
439 struct vmw_cmdbuf_context *ctx;
440 int i;
441
442retry:
443 notempty = 0;
444 for_each_cmdbuf_ctx(man, i, ctx)
445 vmw_cmdbuf_ctx_process(man, ctx, ¬empty);
446
447 if (man->irq_on && !notempty) {
448 vmw_generic_waiter_remove(man->dev_priv,
449 SVGA_IRQFLAG_COMMAND_BUFFER,
450 &man->dev_priv->cmdbuf_waiters);
451 man->irq_on = false;
452 } else if (!man->irq_on && notempty) {
453 vmw_generic_waiter_add(man->dev_priv,
454 SVGA_IRQFLAG_COMMAND_BUFFER,
455 &man->dev_priv->cmdbuf_waiters);
456 man->irq_on = true;
457
458 /* Rerun in case we just missed an irq. */
459 goto retry;
460 }
461}
462
463/**
464 * vmw_cmdbuf_ctx_add - Schedule a command buffer for submission on a
465 * command buffer context
466 *
467 * @man: The command buffer manager.
468 * @header: The header of the buffer to submit.
469 * @cb_context: The command buffer context to use.
470 *
471 * This function adds @header to the "submitted" queue of the command
472 * buffer context identified by @cb_context. It then calls the command buffer
473 * manager processing to potentially submit the buffer to hardware.
474 * @man->lock needs to be held when calling this function.
475 */
476static void vmw_cmdbuf_ctx_add(struct vmw_cmdbuf_man *man,
477 struct vmw_cmdbuf_header *header,
478 SVGACBContext cb_context)
479{
480 if (!(header->cb_header->flags & SVGA_CB_FLAG_DX_CONTEXT))
481 header->cb_header->dxContext = 0;
482 header->cb_context = cb_context;
483 list_add_tail(&header->list, &man->ctx[cb_context].submitted);
484
485 vmw_cmdbuf_man_process(man);
486}
487
488/**
489 * vmw_cmdbuf_irqthread - The main part of the command buffer interrupt
490 * handler implemented as a threaded irq task.
491 *
492 * @man: Pointer to the command buffer manager.
493 *
494 * The bottom half of the interrupt handler simply calls into the
495 * command buffer processor to free finished buffers and submit any
496 * queued buffers to hardware.
497 */
498void vmw_cmdbuf_irqthread(struct vmw_cmdbuf_man *man)
499{
500 spin_lock(&man->lock);
501 vmw_cmdbuf_man_process(man);
502 spin_unlock(&man->lock);
503}
504
505/**
506 * vmw_cmdbuf_work_func - The deferred work function that handles
507 * command buffer errors.
508 *
509 * @work: The work func closure argument.
510 *
511 * Restarting the command buffer context after an error requires process
512 * context, so it is deferred to this work function.
513 */
514static void vmw_cmdbuf_work_func(struct work_struct *work)
515{
516 struct vmw_cmdbuf_man *man =
517 container_of(work, struct vmw_cmdbuf_man, work);
518 struct vmw_cmdbuf_header *entry, *next;
519 uint32_t dummy = 0;
520 bool send_fence = false;
521 struct list_head restart_head[SVGA_CB_CONTEXT_MAX];
522 int i;
523 struct vmw_cmdbuf_context *ctx;
524 bool global_block = false;
525
526 for_each_cmdbuf_ctx(man, i, ctx)
527 INIT_LIST_HEAD(&restart_head[i]);
528
529 mutex_lock(&man->error_mutex);
530 spin_lock(&man->lock);
531 list_for_each_entry_safe(entry, next, &man->error, list) {
532 SVGACBHeader *cb_hdr = entry->cb_header;
533 SVGA3dCmdHeader *header = (SVGA3dCmdHeader *)
534 (entry->cmd + cb_hdr->errorOffset);
535 u32 error_cmd_size, new_start_offset;
536 const char *cmd_name;
537
538 list_del_init(&entry->list);
539 global_block = true;
540
541 if (!vmw_cmd_describe(header, &error_cmd_size, &cmd_name)) {
542 VMW_DEBUG_USER("Unknown command causing device error.\n");
543 VMW_DEBUG_USER("Command buffer offset is %lu\n",
544 (unsigned long) cb_hdr->errorOffset);
545 __vmw_cmdbuf_header_free(entry);
546 send_fence = true;
547 continue;
548 }
549
550 VMW_DEBUG_USER("Command \"%s\" causing device error.\n",
551 cmd_name);
552 VMW_DEBUG_USER("Command buffer offset is %lu\n",
553 (unsigned long) cb_hdr->errorOffset);
554 VMW_DEBUG_USER("Command size is %lu\n",
555 (unsigned long) error_cmd_size);
556
557 new_start_offset = cb_hdr->errorOffset + error_cmd_size;
558
559 if (new_start_offset >= cb_hdr->length) {
560 __vmw_cmdbuf_header_free(entry);
561 send_fence = true;
562 continue;
563 }
564
565 if (man->using_mob)
566 cb_hdr->ptr.mob.mobOffset += new_start_offset;
567 else
568 cb_hdr->ptr.pa += (u64) new_start_offset;
569
570 entry->cmd += new_start_offset;
571 cb_hdr->length -= new_start_offset;
572 cb_hdr->errorOffset = 0;
573 cb_hdr->offset = 0;
574
575 list_add_tail(&entry->list, &restart_head[entry->cb_context]);
576 }
577
578 for_each_cmdbuf_ctx(man, i, ctx)
579 man->ctx[i].block_submission = true;
580
581 spin_unlock(&man->lock);
582
583 /* Preempt all contexts */
584 if (global_block && vmw_cmdbuf_preempt(man, 0))
585 DRM_ERROR("Failed preempting command buffer contexts\n");
586
587 spin_lock(&man->lock);
588 for_each_cmdbuf_ctx(man, i, ctx) {
589 /* Move preempted command buffers to the preempted queue. */
590 vmw_cmdbuf_ctx_process(man, ctx, &dummy);
591
592 /*
593 * Add the preempted queue after the command buffer
594 * that caused an error.
595 */
596 list_splice_init(&ctx->preempted, restart_head[i].prev);
597
598 /*
599 * Finally add all command buffers first in the submitted
600 * queue, to rerun them.
601 */
602
603 ctx->block_submission = false;
604 list_splice_init(&restart_head[i], &ctx->submitted);
605 }
606
607 vmw_cmdbuf_man_process(man);
608 spin_unlock(&man->lock);
609
610 if (global_block && vmw_cmdbuf_startstop(man, 0, true))
611 DRM_ERROR("Failed restarting command buffer contexts\n");
612
613 /* Send a new fence in case one was removed */
614 if (send_fence) {
615 vmw_cmd_send_fence(man->dev_priv, &dummy);
616 wake_up_all(&man->idle_queue);
617 }
618
619 mutex_unlock(&man->error_mutex);
620}
621
622/**
623 * vmw_cmdbuf_man_idle - Check whether the command buffer manager is idle.
624 *
625 * @man: The command buffer manager.
626 * @check_preempted: Check also the preempted queue for pending command buffers.
627 *
628 */
629static bool vmw_cmdbuf_man_idle(struct vmw_cmdbuf_man *man,
630 bool check_preempted)
631{
632 struct vmw_cmdbuf_context *ctx;
633 bool idle = false;
634 int i;
635
636 spin_lock(&man->lock);
637 vmw_cmdbuf_man_process(man);
638 for_each_cmdbuf_ctx(man, i, ctx) {
639 if (!list_empty(&ctx->submitted) ||
640 !list_empty(&ctx->hw_submitted) ||
641 (check_preempted && !list_empty(&ctx->preempted)))
642 goto out_unlock;
643 }
644
645 idle = list_empty(&man->error);
646
647out_unlock:
648 spin_unlock(&man->lock);
649
650 return idle;
651}
652
653/**
654 * __vmw_cmdbuf_cur_flush - Flush the current command buffer for small kernel
655 * command submissions
656 *
657 * @man: The command buffer manager.
658 *
659 * Flushes the current command buffer without allocating a new one. A new one
660 * is automatically allocated when needed. Call with @man->cur_mutex held.
661 */
662static void __vmw_cmdbuf_cur_flush(struct vmw_cmdbuf_man *man)
663{
664 struct vmw_cmdbuf_header *cur = man->cur;
665
666 lockdep_assert_held_once(&man->cur_mutex);
667
668 if (!cur)
669 return;
670
671 spin_lock(&man->lock);
672 if (man->cur_pos == 0) {
673 __vmw_cmdbuf_header_free(cur);
674 goto out_unlock;
675 }
676
677 man->cur->cb_header->length = man->cur_pos;
678 vmw_cmdbuf_ctx_add(man, man->cur, SVGA_CB_CONTEXT_0);
679out_unlock:
680 spin_unlock(&man->lock);
681 man->cur = NULL;
682 man->cur_pos = 0;
683}
684
685/**
686 * vmw_cmdbuf_cur_flush - Flush the current command buffer for small kernel
687 * command submissions
688 *
689 * @man: The command buffer manager.
690 * @interruptible: Whether to sleep interruptible when sleeping.
691 *
692 * Flushes the current command buffer without allocating a new one. A new one
693 * is automatically allocated when needed.
694 */
695int vmw_cmdbuf_cur_flush(struct vmw_cmdbuf_man *man,
696 bool interruptible)
697{
698 int ret = vmw_cmdbuf_cur_lock(man, interruptible);
699
700 if (ret)
701 return ret;
702
703 __vmw_cmdbuf_cur_flush(man);
704 vmw_cmdbuf_cur_unlock(man);
705
706 return 0;
707}
708
709/**
710 * vmw_cmdbuf_idle - Wait for command buffer manager idle.
711 *
712 * @man: The command buffer manager.
713 * @interruptible: Sleep interruptible while waiting.
714 * @timeout: Time out after this many ticks.
715 *
716 * Wait until the command buffer manager has processed all command buffers,
717 * or until a timeout occurs. If a timeout occurs, the function will return
718 * -EBUSY.
719 */
720int vmw_cmdbuf_idle(struct vmw_cmdbuf_man *man, bool interruptible,
721 unsigned long timeout)
722{
723 int ret;
724
725 ret = vmw_cmdbuf_cur_flush(man, interruptible);
726 vmw_generic_waiter_add(man->dev_priv,
727 SVGA_IRQFLAG_COMMAND_BUFFER,
728 &man->dev_priv->cmdbuf_waiters);
729
730 if (interruptible) {
731 ret = wait_event_interruptible_timeout
732 (man->idle_queue, vmw_cmdbuf_man_idle(man, true),
733 timeout);
734 } else {
735 ret = wait_event_timeout
736 (man->idle_queue, vmw_cmdbuf_man_idle(man, true),
737 timeout);
738 }
739 vmw_generic_waiter_remove(man->dev_priv,
740 SVGA_IRQFLAG_COMMAND_BUFFER,
741 &man->dev_priv->cmdbuf_waiters);
742 if (ret == 0) {
743 if (!vmw_cmdbuf_man_idle(man, true))
744 ret = -EBUSY;
745 else
746 ret = 0;
747 }
748 if (ret > 0)
749 ret = 0;
750
751 return ret;
752}
753
754/**
755 * vmw_cmdbuf_try_alloc - Try to allocate buffer space from the main pool.
756 *
757 * @man: The command buffer manager.
758 * @info: Allocation info. Will hold the size on entry and allocated mm node
759 * on successful return.
760 *
761 * Try to allocate buffer space from the main pool. Returns true if succeeded.
762 * If a fatal error was hit, the error code is returned in @info->ret.
763 */
764static bool vmw_cmdbuf_try_alloc(struct vmw_cmdbuf_man *man,
765 struct vmw_cmdbuf_alloc_info *info)
766{
767 int ret;
768
769 if (info->done)
770 return true;
771
772 memset(info->node, 0, sizeof(*info->node));
773 spin_lock(&man->lock);
774 ret = drm_mm_insert_node(&man->mm, info->node, info->page_size);
775 if (ret) {
776 vmw_cmdbuf_man_process(man);
777 ret = drm_mm_insert_node(&man->mm, info->node, info->page_size);
778 }
779
780 spin_unlock(&man->lock);
781 info->done = !ret;
782
783 return info->done;
784}
785
786/**
787 * vmw_cmdbuf_alloc_space - Allocate buffer space from the main pool.
788 *
789 * @man: The command buffer manager.
790 * @node: Pointer to pre-allocated range-manager node.
791 * @size: The size of the allocation.
792 * @interruptible: Whether to sleep interruptible while waiting for space.
793 *
794 * This function allocates buffer space from the main pool, and if there is
795 * no space available ATM, it turns on IRQ handling and sleeps waiting for it to
796 * become available.
797 */
798static int vmw_cmdbuf_alloc_space(struct vmw_cmdbuf_man *man,
799 struct drm_mm_node *node,
800 size_t size,
801 bool interruptible)
802{
803 struct vmw_cmdbuf_alloc_info info;
804
805 info.page_size = PAGE_ALIGN(size) >> PAGE_SHIFT;
806 info.node = node;
807 info.done = false;
808
809 /*
810 * To prevent starvation of large requests, only one allocating call
811 * at a time waiting for space.
812 */
813 if (interruptible) {
814 if (mutex_lock_interruptible(&man->space_mutex))
815 return -ERESTARTSYS;
816 } else {
817 mutex_lock(&man->space_mutex);
818 }
819
820 /* Try to allocate space without waiting. */
821 if (vmw_cmdbuf_try_alloc(man, &info))
822 goto out_unlock;
823
824 vmw_generic_waiter_add(man->dev_priv,
825 SVGA_IRQFLAG_COMMAND_BUFFER,
826 &man->dev_priv->cmdbuf_waiters);
827
828 if (interruptible) {
829 int ret;
830
831 ret = wait_event_interruptible
832 (man->alloc_queue, vmw_cmdbuf_try_alloc(man, &info));
833 if (ret) {
834 vmw_generic_waiter_remove
835 (man->dev_priv, SVGA_IRQFLAG_COMMAND_BUFFER,
836 &man->dev_priv->cmdbuf_waiters);
837 mutex_unlock(&man->space_mutex);
838 return ret;
839 }
840 } else {
841 wait_event(man->alloc_queue, vmw_cmdbuf_try_alloc(man, &info));
842 }
843 vmw_generic_waiter_remove(man->dev_priv,
844 SVGA_IRQFLAG_COMMAND_BUFFER,
845 &man->dev_priv->cmdbuf_waiters);
846
847out_unlock:
848 mutex_unlock(&man->space_mutex);
849
850 return 0;
851}
852
853/**
854 * vmw_cmdbuf_space_pool - Set up a command buffer header with command buffer
855 * space from the main pool.
856 *
857 * @man: The command buffer manager.
858 * @header: Pointer to the header to set up.
859 * @size: The requested size of the buffer space.
860 * @interruptible: Whether to sleep interruptible while waiting for space.
861 */
862static int vmw_cmdbuf_space_pool(struct vmw_cmdbuf_man *man,
863 struct vmw_cmdbuf_header *header,
864 size_t size,
865 bool interruptible)
866{
867 SVGACBHeader *cb_hdr;
868 size_t offset;
869 int ret;
870
871 if (!man->has_pool)
872 return -ENOMEM;
873
874 ret = vmw_cmdbuf_alloc_space(man, &header->node, size, interruptible);
875
876 if (ret)
877 return ret;
878
879 header->cb_header = dma_pool_zalloc(man->headers, GFP_KERNEL,
880 &header->handle);
881 if (!header->cb_header) {
882 ret = -ENOMEM;
883 goto out_no_cb_header;
884 }
885
886 header->size = header->node.size << PAGE_SHIFT;
887 cb_hdr = header->cb_header;
888 offset = header->node.start << PAGE_SHIFT;
889 header->cmd = man->map + offset;
890 if (man->using_mob) {
891 cb_hdr->flags = SVGA_CB_FLAG_MOB;
892 cb_hdr->ptr.mob.mobid = man->cmd_space->resource->start;
893 cb_hdr->ptr.mob.mobOffset = offset;
894 } else {
895 cb_hdr->ptr.pa = (u64)man->handle + (u64)offset;
896 }
897
898 return 0;
899
900out_no_cb_header:
901 spin_lock(&man->lock);
902 drm_mm_remove_node(&header->node);
903 spin_unlock(&man->lock);
904
905 return ret;
906}
907
908/**
909 * vmw_cmdbuf_space_inline - Set up a command buffer header with
910 * inline command buffer space.
911 *
912 * @man: The command buffer manager.
913 * @header: Pointer to the header to set up.
914 * @size: The requested size of the buffer space.
915 */
916static int vmw_cmdbuf_space_inline(struct vmw_cmdbuf_man *man,
917 struct vmw_cmdbuf_header *header,
918 int size)
919{
920 struct vmw_cmdbuf_dheader *dheader;
921 SVGACBHeader *cb_hdr;
922
923 if (WARN_ON_ONCE(size > VMW_CMDBUF_INLINE_SIZE))
924 return -ENOMEM;
925
926 dheader = dma_pool_zalloc(man->dheaders, GFP_KERNEL,
927 &header->handle);
928 if (!dheader)
929 return -ENOMEM;
930
931 header->inline_space = true;
932 header->size = VMW_CMDBUF_INLINE_SIZE;
933 cb_hdr = &dheader->cb_header;
934 header->cb_header = cb_hdr;
935 header->cmd = dheader->cmd;
936 cb_hdr->status = SVGA_CB_STATUS_NONE;
937 cb_hdr->flags = SVGA_CB_FLAG_NONE;
938 cb_hdr->ptr.pa = (u64)header->handle +
939 (u64)offsetof(struct vmw_cmdbuf_dheader, cmd);
940
941 return 0;
942}
943
944/**
945 * vmw_cmdbuf_alloc - Allocate a command buffer header complete with
946 * command buffer space.
947 *
948 * @man: The command buffer manager.
949 * @size: The requested size of the buffer space.
950 * @interruptible: Whether to sleep interruptible while waiting for space.
951 * @p_header: points to a header pointer to populate on successful return.
952 *
953 * Returns a pointer to command buffer space if successful. Otherwise
954 * returns an error pointer. The header pointer returned in @p_header should
955 * be used for upcoming calls to vmw_cmdbuf_reserve() and vmw_cmdbuf_commit().
956 */
957void *vmw_cmdbuf_alloc(struct vmw_cmdbuf_man *man,
958 size_t size, bool interruptible,
959 struct vmw_cmdbuf_header **p_header)
960{
961 struct vmw_cmdbuf_header *header;
962 int ret = 0;
963
964 *p_header = NULL;
965
966 header = kzalloc(sizeof(*header), GFP_KERNEL);
967 if (!header)
968 return ERR_PTR(-ENOMEM);
969
970 if (size <= VMW_CMDBUF_INLINE_SIZE)
971 ret = vmw_cmdbuf_space_inline(man, header, size);
972 else
973 ret = vmw_cmdbuf_space_pool(man, header, size, interruptible);
974
975 if (ret) {
976 kfree(header);
977 return ERR_PTR(ret);
978 }
979
980 header->man = man;
981 INIT_LIST_HEAD(&header->list);
982 header->cb_header->status = SVGA_CB_STATUS_NONE;
983 *p_header = header;
984
985 return header->cmd;
986}
987
988/**
989 * vmw_cmdbuf_reserve_cur - Reserve space for commands in the current
990 * command buffer.
991 *
992 * @man: The command buffer manager.
993 * @size: The requested size of the commands.
994 * @ctx_id: The context id if any. Otherwise set to SVGA3D_REG_INVALID.
995 * @interruptible: Whether to sleep interruptible while waiting for space.
996 *
997 * Returns a pointer to command buffer space if successful. Otherwise
998 * returns an error pointer.
999 */
1000static void *vmw_cmdbuf_reserve_cur(struct vmw_cmdbuf_man *man,
1001 size_t size,
1002 int ctx_id,
1003 bool interruptible)
1004{
1005 struct vmw_cmdbuf_header *cur;
1006 void *ret;
1007
1008 if (vmw_cmdbuf_cur_lock(man, interruptible))
1009 return ERR_PTR(-ERESTARTSYS);
1010
1011 cur = man->cur;
1012 if (cur && (size + man->cur_pos > cur->size ||
1013 ((cur->cb_header->flags & SVGA_CB_FLAG_DX_CONTEXT) &&
1014 ctx_id != cur->cb_header->dxContext)))
1015 __vmw_cmdbuf_cur_flush(man);
1016
1017 if (!man->cur) {
1018 ret = vmw_cmdbuf_alloc(man,
1019 max_t(size_t, size, man->default_size),
1020 interruptible, &man->cur);
1021 if (IS_ERR(ret)) {
1022 vmw_cmdbuf_cur_unlock(man);
1023 return ret;
1024 }
1025
1026 cur = man->cur;
1027 }
1028
1029 if (ctx_id != SVGA3D_INVALID_ID) {
1030 cur->cb_header->flags |= SVGA_CB_FLAG_DX_CONTEXT;
1031 cur->cb_header->dxContext = ctx_id;
1032 }
1033
1034 cur->reserved = size;
1035
1036 return (void *) (man->cur->cmd + man->cur_pos);
1037}
1038
1039/**
1040 * vmw_cmdbuf_commit_cur - Commit commands in the current command buffer.
1041 *
1042 * @man: The command buffer manager.
1043 * @size: The size of the commands actually written.
1044 * @flush: Whether to flush the command buffer immediately.
1045 */
1046static void vmw_cmdbuf_commit_cur(struct vmw_cmdbuf_man *man,
1047 size_t size, bool flush)
1048{
1049 struct vmw_cmdbuf_header *cur = man->cur;
1050
1051 lockdep_assert_held_once(&man->cur_mutex);
1052
1053 WARN_ON(size > cur->reserved);
1054 man->cur_pos += size;
1055 if (!size)
1056 cur->cb_header->flags &= ~SVGA_CB_FLAG_DX_CONTEXT;
1057 if (flush)
1058 __vmw_cmdbuf_cur_flush(man);
1059 vmw_cmdbuf_cur_unlock(man);
1060}
1061
1062/**
1063 * vmw_cmdbuf_reserve - Reserve space for commands in a command buffer.
1064 *
1065 * @man: The command buffer manager.
1066 * @size: The requested size of the commands.
1067 * @ctx_id: The context id if any. Otherwise set to SVGA3D_REG_INVALID.
1068 * @interruptible: Whether to sleep interruptible while waiting for space.
1069 * @header: Header of the command buffer. NULL if the current command buffer
1070 * should be used.
1071 *
1072 * Returns a pointer to command buffer space if successful. Otherwise
1073 * returns an error pointer.
1074 */
1075void *vmw_cmdbuf_reserve(struct vmw_cmdbuf_man *man, size_t size,
1076 int ctx_id, bool interruptible,
1077 struct vmw_cmdbuf_header *header)
1078{
1079 if (!header)
1080 return vmw_cmdbuf_reserve_cur(man, size, ctx_id, interruptible);
1081
1082 if (size > header->size)
1083 return ERR_PTR(-EINVAL);
1084
1085 if (ctx_id != SVGA3D_INVALID_ID) {
1086 header->cb_header->flags |= SVGA_CB_FLAG_DX_CONTEXT;
1087 header->cb_header->dxContext = ctx_id;
1088 }
1089
1090 header->reserved = size;
1091 return header->cmd;
1092}
1093
1094/**
1095 * vmw_cmdbuf_commit - Commit commands in a command buffer.
1096 *
1097 * @man: The command buffer manager.
1098 * @size: The size of the commands actually written.
1099 * @header: Header of the command buffer. NULL if the current command buffer
1100 * should be used.
1101 * @flush: Whether to flush the command buffer immediately.
1102 */
1103void vmw_cmdbuf_commit(struct vmw_cmdbuf_man *man, size_t size,
1104 struct vmw_cmdbuf_header *header, bool flush)
1105{
1106 if (!header) {
1107 vmw_cmdbuf_commit_cur(man, size, flush);
1108 return;
1109 }
1110
1111 (void) vmw_cmdbuf_cur_lock(man, false);
1112 __vmw_cmdbuf_cur_flush(man);
1113 WARN_ON(size > header->reserved);
1114 man->cur = header;
1115 man->cur_pos = size;
1116 if (!size)
1117 header->cb_header->flags &= ~SVGA_CB_FLAG_DX_CONTEXT;
1118 if (flush)
1119 __vmw_cmdbuf_cur_flush(man);
1120 vmw_cmdbuf_cur_unlock(man);
1121}
1122
1123
1124/**
1125 * vmw_cmdbuf_send_device_command - Send a command through the device context.
1126 *
1127 * @man: The command buffer manager.
1128 * @command: Pointer to the command to send.
1129 * @size: Size of the command.
1130 *
1131 * Synchronously sends a device context command.
1132 */
1133static int vmw_cmdbuf_send_device_command(struct vmw_cmdbuf_man *man,
1134 const void *command,
1135 size_t size)
1136{
1137 struct vmw_cmdbuf_header *header;
1138 int status;
1139 void *cmd = vmw_cmdbuf_alloc(man, size, false, &header);
1140
1141 if (IS_ERR(cmd))
1142 return PTR_ERR(cmd);
1143
1144 memcpy(cmd, command, size);
1145 header->cb_header->length = size;
1146 header->cb_context = SVGA_CB_CONTEXT_DEVICE;
1147 spin_lock(&man->lock);
1148 status = vmw_cmdbuf_header_submit(header);
1149 spin_unlock(&man->lock);
1150 vmw_cmdbuf_header_free(header);
1151
1152 if (status != SVGA_CB_STATUS_COMPLETED) {
1153 DRM_ERROR("Device context command failed with status %d\n",
1154 status);
1155 return -EINVAL;
1156 }
1157
1158 return 0;
1159}
1160
1161/**
1162 * vmw_cmdbuf_preempt - Send a preempt command through the device
1163 * context.
1164 *
1165 * @man: The command buffer manager.
1166 * @context: Device context to pass command through.
1167 *
1168 * Synchronously sends a preempt command.
1169 */
1170static int vmw_cmdbuf_preempt(struct vmw_cmdbuf_man *man, u32 context)
1171{
1172 struct {
1173 uint32 id;
1174 SVGADCCmdPreempt body;
1175 } __packed cmd;
1176
1177 cmd.id = SVGA_DC_CMD_PREEMPT;
1178 cmd.body.context = SVGA_CB_CONTEXT_0 + context;
1179 cmd.body.ignoreIDZero = 0;
1180
1181 return vmw_cmdbuf_send_device_command(man, &cmd, sizeof(cmd));
1182}
1183
1184
1185/**
1186 * vmw_cmdbuf_startstop - Send a start / stop command through the device
1187 * context.
1188 *
1189 * @man: The command buffer manager.
1190 * @context: Device context to start/stop.
1191 * @enable: Whether to enable or disable the context.
1192 *
1193 * Synchronously sends a device start / stop context command.
1194 */
1195static int vmw_cmdbuf_startstop(struct vmw_cmdbuf_man *man, u32 context,
1196 bool enable)
1197{
1198 struct {
1199 uint32 id;
1200 SVGADCCmdStartStop body;
1201 } __packed cmd;
1202
1203 cmd.id = SVGA_DC_CMD_START_STOP_CONTEXT;
1204 cmd.body.enable = (enable) ? 1 : 0;
1205 cmd.body.context = SVGA_CB_CONTEXT_0 + context;
1206
1207 return vmw_cmdbuf_send_device_command(man, &cmd, sizeof(cmd));
1208}
1209
1210/**
1211 * vmw_cmdbuf_set_pool_size - Set command buffer manager sizes
1212 *
1213 * @man: The command buffer manager.
1214 * @size: The size of the main space pool.
1215 *
1216 * Set the size and allocate the main command buffer space pool.
1217 * If successful, this enables large command submissions.
1218 * Note that this function requires that rudimentary command
1219 * submission is already available and that the MOB memory manager is alive.
1220 * Returns 0 on success. Negative error code on failure.
1221 */
1222int vmw_cmdbuf_set_pool_size(struct vmw_cmdbuf_man *man, size_t 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->drm.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 !dev_priv->has_mob)
1246 return -ENOMEM;
1247
1248 ret = vmw_bo_create_kernel(dev_priv, size,
1249 &vmw_mob_placement,
1250 &man->cmd_space);
1251 if (ret)
1252 return ret;
1253
1254 man->using_mob = true;
1255 ret = ttm_bo_kmap(man->cmd_space, 0, size >> PAGE_SHIFT,
1256 &man->map_obj);
1257 if (ret)
1258 goto out_no_map;
1259
1260 man->map = ttm_kmap_obj_virtual(&man->map_obj, &dummy);
1261 }
1262
1263 man->size = size;
1264 drm_mm_init(&man->mm, 0, size >> PAGE_SHIFT);
1265
1266 man->has_pool = true;
1267
1268 /*
1269 * For now, set the default size to VMW_CMDBUF_INLINE_SIZE to
1270 * prevent deadlocks from happening when vmw_cmdbuf_space_pool()
1271 * needs to wait for space and we block on further command
1272 * submissions to be able to free up space.
1273 */
1274 man->default_size = VMW_CMDBUF_INLINE_SIZE;
1275 DRM_INFO("Using command buffers with %s pool.\n",
1276 (man->using_mob) ? "MOB" : "DMA");
1277
1278 return 0;
1279
1280out_no_map:
1281 if (man->using_mob) {
1282 ttm_bo_put(man->cmd_space);
1283 man->cmd_space = NULL;
1284 }
1285
1286 return ret;
1287}
1288
1289/**
1290 * vmw_cmdbuf_man_create: Create a command buffer manager and enable it for
1291 * inline command buffer submissions only.
1292 *
1293 * @dev_priv: Pointer to device private structure.
1294 *
1295 * Returns a pointer to a cummand buffer manager to success or error pointer
1296 * on failure. The command buffer manager will be enabled for submissions of
1297 * size VMW_CMDBUF_INLINE_SIZE only.
1298 */
1299struct vmw_cmdbuf_man *vmw_cmdbuf_man_create(struct vmw_private *dev_priv)
1300{
1301 struct vmw_cmdbuf_man *man;
1302 struct vmw_cmdbuf_context *ctx;
1303 unsigned int i;
1304 int ret;
1305
1306 if (!(dev_priv->capabilities & SVGA_CAP_COMMAND_BUFFERS))
1307 return ERR_PTR(-ENOSYS);
1308
1309 man = kzalloc(sizeof(*man), GFP_KERNEL);
1310 if (!man)
1311 return ERR_PTR(-ENOMEM);
1312
1313 man->num_contexts = (dev_priv->capabilities & SVGA_CAP_HP_CMD_QUEUE) ?
1314 2 : 1;
1315 man->headers = dma_pool_create("vmwgfx cmdbuf",
1316 dev_priv->drm.dev,
1317 sizeof(SVGACBHeader),
1318 64, PAGE_SIZE);
1319 if (!man->headers) {
1320 ret = -ENOMEM;
1321 goto out_no_pool;
1322 }
1323
1324 man->dheaders = dma_pool_create("vmwgfx inline cmdbuf",
1325 dev_priv->drm.dev,
1326 sizeof(struct vmw_cmdbuf_dheader),
1327 64, PAGE_SIZE);
1328 if (!man->dheaders) {
1329 ret = -ENOMEM;
1330 goto out_no_dpool;
1331 }
1332
1333 for_each_cmdbuf_ctx(man, i, ctx)
1334 vmw_cmdbuf_ctx_init(ctx);
1335
1336 INIT_LIST_HEAD(&man->error);
1337 spin_lock_init(&man->lock);
1338 mutex_init(&man->cur_mutex);
1339 mutex_init(&man->space_mutex);
1340 mutex_init(&man->error_mutex);
1341 man->default_size = VMW_CMDBUF_INLINE_SIZE;
1342 init_waitqueue_head(&man->alloc_queue);
1343 init_waitqueue_head(&man->idle_queue);
1344 man->dev_priv = dev_priv;
1345 man->max_hw_submitted = SVGA_CB_MAX_QUEUED_PER_CONTEXT - 1;
1346 INIT_WORK(&man->work, &vmw_cmdbuf_work_func);
1347 vmw_generic_waiter_add(dev_priv, SVGA_IRQFLAG_ERROR,
1348 &dev_priv->error_waiters);
1349 ret = vmw_cmdbuf_startstop(man, 0, true);
1350 if (ret) {
1351 DRM_ERROR("Failed starting command buffer contexts\n");
1352 vmw_cmdbuf_man_destroy(man);
1353 return ERR_PTR(ret);
1354 }
1355
1356 return man;
1357
1358out_no_dpool:
1359 dma_pool_destroy(man->headers);
1360out_no_pool:
1361 kfree(man);
1362
1363 return ERR_PTR(ret);
1364}
1365
1366/**
1367 * vmw_cmdbuf_remove_pool - Take down the main buffer space pool.
1368 *
1369 * @man: Pointer to a command buffer manager.
1370 *
1371 * This function removes the main buffer space pool, and should be called
1372 * before MOB memory management is removed. When this function has been called,
1373 * only small command buffer submissions of size VMW_CMDBUF_INLINE_SIZE or
1374 * less are allowed, and the default size of the command buffer for small kernel
1375 * submissions is also set to this size.
1376 */
1377void vmw_cmdbuf_remove_pool(struct vmw_cmdbuf_man *man)
1378{
1379 if (!man->has_pool)
1380 return;
1381
1382 man->has_pool = false;
1383 man->default_size = VMW_CMDBUF_INLINE_SIZE;
1384 (void) vmw_cmdbuf_idle(man, false, 10*HZ);
1385 if (man->using_mob) {
1386 (void) ttm_bo_kunmap(&man->map_obj);
1387 ttm_bo_put(man->cmd_space);
1388 man->cmd_space = NULL;
1389 } else {
1390 dma_free_coherent(man->dev_priv->drm.dev,
1391 man->size, man->map, man->handle);
1392 }
1393}
1394
1395/**
1396 * vmw_cmdbuf_man_destroy - Take down a command buffer manager.
1397 *
1398 * @man: Pointer to a command buffer manager.
1399 *
1400 * This function idles and then destroys a command buffer manager.
1401 */
1402void vmw_cmdbuf_man_destroy(struct vmw_cmdbuf_man *man)
1403{
1404 WARN_ON_ONCE(man->has_pool);
1405 (void) vmw_cmdbuf_idle(man, false, 10*HZ);
1406
1407 if (vmw_cmdbuf_startstop(man, 0, false))
1408 DRM_ERROR("Failed stopping command buffer contexts.\n");
1409
1410 vmw_generic_waiter_remove(man->dev_priv, SVGA_IRQFLAG_ERROR,
1411 &man->dev_priv->error_waiters);
1412 (void) cancel_work_sync(&man->work);
1413 dma_pool_destroy(man->dheaders);
1414 dma_pool_destroy(man->headers);
1415 mutex_destroy(&man->cur_mutex);
1416 mutex_destroy(&man->space_mutex);
1417 mutex_destroy(&man->error_mutex);
1418 kfree(man);
1419}