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