1 /**************************************************************************
3 * Copyright © 2007 Red Hat Inc.
4 * Copyright © 2007-2012 Intel Corporation
5 * Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND., USA
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the
10 * "Software"), to deal in the Software without restriction, including
11 * without limitation the rights to use, copy, modify, merge, publish,
12 * distribute, sub license, and/or sell copies of the Software, and to
13 * permit persons to whom the Software is furnished to do so, subject to
14 * the following conditions:
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
22 * USE OR OTHER DEALINGS IN THE SOFTWARE.
24 * The above copyright notice and this permission notice (including the
25 * next paragraph) shall be included in all copies or substantial portions
29 **************************************************************************/
31 * Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
32 * Keith Whitwell <keithw-at-tungstengraphics-dot-com>
33 * Eric Anholt <eric@anholt.net>
34 * Dave Airlie <airlied@linux.ie>
42 #include <util/u_atomic.h>
50 #include <sys/ioctl.h>
52 #include <sys/types.h>
57 #define ETIME ETIMEDOUT
59 #include "common/gen_debug.h"
60 #include "common/gen_device_info.h"
61 #include "libdrm_macros.h"
62 #include "main/macros.h"
63 #include "util/macros.h"
64 #include "util/hash_table.h"
65 #include "util/list.h"
66 #include "brw_bufmgr.h"
67 #include "brw_context.h"
80 #define memclear(s) memset(&s, 0, sizeof(s))
82 #define FILE_DEBUG_FLAG DEBUG_BUFMGR
85 atomic_add_unless(int *v
, int add
, int unless
)
89 while (c
!= unless
&& (old
= p_atomic_cmpxchg(v
, c
, c
+ add
)) != c
)
94 struct bo_cache_bucket
{
95 struct list_head head
;
102 pthread_mutex_t lock
;
104 /** Array of lists of cached gem objects of power-of-two sizes */
105 struct bo_cache_bucket cache_bucket
[14 * 4];
109 struct hash_table
*name_table
;
110 struct hash_table
*handle_table
;
116 static int bo_set_tiling_internal(struct brw_bo
*bo
, uint32_t tiling_mode
,
119 static void bo_free(struct brw_bo
*bo
);
122 key_hash_uint(const void *key
)
124 return _mesa_hash_data(key
, 4);
128 key_uint_equal(const void *a
, const void *b
)
130 return *((unsigned *) a
) == *((unsigned *) b
);
133 static struct brw_bo
*
134 hash_find_bo(struct hash_table
*ht
, unsigned int key
)
136 struct hash_entry
*entry
= _mesa_hash_table_search(ht
, &key
);
137 return entry
? (struct brw_bo
*) entry
->data
: NULL
;
141 bo_tile_size(struct brw_bufmgr
*bufmgr
, uint64_t size
, uint32_t tiling
)
143 if (tiling
== I915_TILING_NONE
)
146 /* 965+ just need multiples of page size for tiling */
147 return ALIGN(size
, 4096);
151 * Round a given pitch up to the minimum required for X tiling on a
152 * given chip. We use 512 as the minimum to allow for a later tiling
156 bo_tile_pitch(struct brw_bufmgr
*bufmgr
, uint32_t pitch
, uint32_t tiling
)
158 unsigned long tile_width
;
160 /* If untiled, then just align it so that we can do rendering
161 * to it with the 3D engine.
163 if (tiling
== I915_TILING_NONE
)
164 return ALIGN(pitch
, 64);
166 if (tiling
== I915_TILING_X
)
171 /* 965 is flexible */
172 return ALIGN(pitch
, tile_width
);
175 static struct bo_cache_bucket
*
176 bucket_for_size(struct brw_bufmgr
*bufmgr
, uint64_t size
)
180 for (i
= 0; i
< bufmgr
->num_buckets
; i
++) {
181 struct bo_cache_bucket
*bucket
= &bufmgr
->cache_bucket
[i
];
182 if (bucket
->size
>= size
) {
191 brw_bo_reference(struct brw_bo
*bo
)
193 p_atomic_inc(&bo
->refcount
);
197 brw_bo_busy(struct brw_bo
*bo
)
199 struct brw_bufmgr
*bufmgr
= bo
->bufmgr
;
200 struct drm_i915_gem_busy busy
;
204 busy
.handle
= bo
->gem_handle
;
206 ret
= drmIoctl(bufmgr
->fd
, DRM_IOCTL_I915_GEM_BUSY
, &busy
);
208 bo
->idle
= !busy
.busy
;
215 brw_bo_madvise(struct brw_bo
*bo
, int state
)
217 struct drm_i915_gem_madvise madv
;
220 madv
.handle
= bo
->gem_handle
;
223 drmIoctl(bo
->bufmgr
->fd
, DRM_IOCTL_I915_GEM_MADVISE
, &madv
);
225 return madv
.retained
;
228 /* drop the oldest entries that have been purged by the kernel */
230 brw_bo_cache_purge_bucket(struct brw_bufmgr
*bufmgr
,
231 struct bo_cache_bucket
*bucket
)
233 list_for_each_entry_safe(struct brw_bo
, bo
, &bucket
->head
, head
) {
234 if (brw_bo_madvise(bo
, I915_MADV_DONTNEED
))
242 static struct brw_bo
*
243 bo_alloc_internal(struct brw_bufmgr
*bufmgr
,
247 uint32_t tiling_mode
,
248 uint32_t stride
, uint64_t alignment
)
251 unsigned int page_size
= getpagesize();
253 struct bo_cache_bucket
*bucket
;
254 bool alloc_from_cache
;
256 bool for_render
= false;
258 if (flags
& BO_ALLOC_FOR_RENDER
)
261 /* Round the allocated size up to a power of two number of pages. */
262 bucket
= bucket_for_size(bufmgr
, size
);
264 /* If we don't have caching at this size, don't actually round the
267 if (bucket
== NULL
) {
269 if (bo_size
< page_size
)
272 bo_size
= bucket
->size
;
275 pthread_mutex_lock(&bufmgr
->lock
);
276 /* Get a buffer out of the cache if available */
278 alloc_from_cache
= false;
279 if (bucket
!= NULL
&& !list_empty(&bucket
->head
)) {
281 /* Allocate new render-target BOs from the tail (MRU)
282 * of the list, as it will likely be hot in the GPU
283 * cache and in the aperture for us.
285 bo
= LIST_ENTRY(struct brw_bo
, bucket
->head
.prev
, head
);
287 alloc_from_cache
= true;
288 bo
->align
= alignment
;
290 assert(alignment
== 0);
291 /* For non-render-target BOs (where we're probably
292 * going to map it first thing in order to fill it
293 * with data), check if the last BO in the cache is
294 * unbusy, and only reuse in that case. Otherwise,
295 * allocating a new buffer is probably faster than
296 * waiting for the GPU to finish.
298 bo
= LIST_ENTRY(struct brw_bo
, bucket
->head
.next
, head
);
299 if (!brw_bo_busy(bo
)) {
300 alloc_from_cache
= true;
305 if (alloc_from_cache
) {
306 if (!brw_bo_madvise(bo
, I915_MADV_WILLNEED
)) {
308 brw_bo_cache_purge_bucket(bufmgr
, bucket
);
312 if (bo_set_tiling_internal(bo
, tiling_mode
, stride
)) {
319 if (!alloc_from_cache
) {
320 struct drm_i915_gem_create create
;
322 bo
= calloc(1, sizeof(*bo
));
329 create
.size
= bo_size
;
331 ret
= drmIoctl(bufmgr
->fd
, DRM_IOCTL_I915_GEM_CREATE
, &create
);
337 bo
->gem_handle
= create
.handle
;
338 _mesa_hash_table_insert(bufmgr
->handle_table
, &bo
->gem_handle
, bo
);
341 bo
->align
= alignment
;
343 bo
->tiling_mode
= I915_TILING_NONE
;
344 bo
->swizzle_mode
= I915_BIT_6_SWIZZLE_NONE
;
347 if (bo_set_tiling_internal(bo
, tiling_mode
, stride
))
352 p_atomic_set(&bo
->refcount
, 1);
354 bo
->cache_coherent
= bufmgr
->has_llc
;
356 pthread_mutex_unlock(&bufmgr
->lock
);
358 DBG("bo_create: buf %d (%s) %ldb\n", bo
->gem_handle
, bo
->name
, size
);
365 pthread_mutex_unlock(&bufmgr
->lock
);
370 brw_bo_alloc(struct brw_bufmgr
*bufmgr
,
371 const char *name
, uint64_t size
, uint64_t alignment
)
373 return bo_alloc_internal(bufmgr
, name
, size
, 0, I915_TILING_NONE
, 0, 0);
377 brw_bo_alloc_tiled(struct brw_bufmgr
*bufmgr
, const char *name
,
378 int x
, int y
, int cpp
, uint32_t tiling
,
379 uint32_t *pitch
, unsigned flags
)
383 unsigned long aligned_y
, height_alignment
;
385 /* If we're tiled, our allocations are in 8 or 32-row blocks,
386 * so failure to align our height means that we won't allocate
389 * If we're untiled, we still have to align to 2 rows high
390 * because the data port accesses 2x2 blocks even if the
391 * bottom row isn't to be rendered, so failure to align means
392 * we could walk off the end of the GTT and fault. This is
393 * documented on 965, and may be the case on older chipsets
394 * too so we try to be careful.
397 height_alignment
= 2;
399 if (tiling
== I915_TILING_X
)
400 height_alignment
= 8;
401 else if (tiling
== I915_TILING_Y
)
402 height_alignment
= 32;
403 aligned_y
= ALIGN(y
, height_alignment
);
406 stride
= bo_tile_pitch(bufmgr
, stride
, tiling
);
407 size
= stride
* aligned_y
;
408 size
= bo_tile_size(bufmgr
, size
, tiling
);
411 if (tiling
== I915_TILING_NONE
)
414 return bo_alloc_internal(bufmgr
, name
, size
, flags
, tiling
, stride
, 0);
418 * Returns a brw_bo wrapping the given buffer object handle.
420 * This can be used when one application needs to pass a buffer object
424 brw_bo_gem_create_from_name(struct brw_bufmgr
*bufmgr
,
425 const char *name
, unsigned int handle
)
429 struct drm_gem_open open_arg
;
430 struct drm_i915_gem_get_tiling get_tiling
;
432 /* At the moment most applications only have a few named bo.
433 * For instance, in a DRI client only the render buffers passed
434 * between X and the client are named. And since X returns the
435 * alternating names for the front/back buffer a linear search
436 * provides a sufficiently fast match.
438 pthread_mutex_lock(&bufmgr
->lock
);
439 bo
= hash_find_bo(bufmgr
->name_table
, handle
);
441 brw_bo_reference(bo
);
446 open_arg
.name
= handle
;
447 ret
= drmIoctl(bufmgr
->fd
, DRM_IOCTL_GEM_OPEN
, &open_arg
);
449 DBG("Couldn't reference %s handle 0x%08x: %s\n",
450 name
, handle
, strerror(errno
));
454 /* Now see if someone has used a prime handle to get this
455 * object from the kernel before by looking through the list
456 * again for a matching gem_handle
458 bo
= hash_find_bo(bufmgr
->handle_table
, open_arg
.handle
);
460 brw_bo_reference(bo
);
464 bo
= calloc(1, sizeof(*bo
));
468 p_atomic_set(&bo
->refcount
, 1);
470 bo
->size
= open_arg
.size
;
473 bo
->gem_handle
= open_arg
.handle
;
475 bo
->global_name
= handle
;
476 bo
->reusable
= false;
478 _mesa_hash_table_insert(bufmgr
->handle_table
, &bo
->gem_handle
, bo
);
479 _mesa_hash_table_insert(bufmgr
->name_table
, &bo
->global_name
, bo
);
481 memclear(get_tiling
);
482 get_tiling
.handle
= bo
->gem_handle
;
483 ret
= drmIoctl(bufmgr
->fd
, DRM_IOCTL_I915_GEM_GET_TILING
, &get_tiling
);
487 bo
->tiling_mode
= get_tiling
.tiling_mode
;
488 bo
->swizzle_mode
= get_tiling
.swizzle_mode
;
489 /* XXX stride is unknown */
490 DBG("bo_create_from_handle: %d (%s)\n", handle
, bo
->name
);
493 pthread_mutex_unlock(&bufmgr
->lock
);
498 pthread_mutex_unlock(&bufmgr
->lock
);
503 bo_free(struct brw_bo
*bo
)
505 struct brw_bufmgr
*bufmgr
= bo
->bufmgr
;
506 struct drm_gem_close close
;
507 struct hash_entry
*entry
;
511 VG(VALGRIND_FREELIKE_BLOCK(bo
->map_cpu
, 0));
512 drm_munmap(bo
->map_cpu
, bo
->size
);
515 VG(VALGRIND_FREELIKE_BLOCK(bo
->map_wc
, 0));
516 drm_munmap(bo
->map_wc
, bo
->size
);
519 drm_munmap(bo
->map_gtt
, bo
->size
);
522 if (bo
->global_name
) {
523 entry
= _mesa_hash_table_search(bufmgr
->name_table
, &bo
->global_name
);
524 _mesa_hash_table_remove(bufmgr
->name_table
, entry
);
526 entry
= _mesa_hash_table_search(bufmgr
->handle_table
, &bo
->gem_handle
);
527 _mesa_hash_table_remove(bufmgr
->handle_table
, entry
);
529 /* Close this object */
531 close
.handle
= bo
->gem_handle
;
532 ret
= drmIoctl(bufmgr
->fd
, DRM_IOCTL_GEM_CLOSE
, &close
);
534 DBG("DRM_IOCTL_GEM_CLOSE %d failed (%s): %s\n",
535 bo
->gem_handle
, bo
->name
, strerror(errno
));
541 bo_mark_mmaps_incoherent(struct brw_bo
*bo
)
545 VALGRIND_MAKE_MEM_NOACCESS(bo
->map_cpu
, bo
->size
);
548 VALGRIND_MAKE_MEM_NOACCESS(bo
->map_wc
, bo
->size
);
551 VALGRIND_MAKE_MEM_NOACCESS(bo
->map_gtt
, bo
->size
);
555 /** Frees all cached buffers significantly older than @time. */
557 cleanup_bo_cache(struct brw_bufmgr
*bufmgr
, time_t time
)
561 if (bufmgr
->time
== time
)
564 for (i
= 0; i
< bufmgr
->num_buckets
; i
++) {
565 struct bo_cache_bucket
*bucket
= &bufmgr
->cache_bucket
[i
];
567 list_for_each_entry_safe(struct brw_bo
, bo
, &bucket
->head
, head
) {
568 if (time
- bo
->free_time
<= 1)
581 bo_unreference_final(struct brw_bo
*bo
, time_t time
)
583 struct brw_bufmgr
*bufmgr
= bo
->bufmgr
;
584 struct bo_cache_bucket
*bucket
;
586 DBG("bo_unreference final: %d (%s)\n", bo
->gem_handle
, bo
->name
);
588 /* Clear any left-over mappings */
590 DBG("bo freed with non-zero map-count %d\n", bo
->map_count
);
592 bo_mark_mmaps_incoherent(bo
);
595 bucket
= bucket_for_size(bufmgr
, bo
->size
);
596 /* Put the buffer into our internal cache for reuse if we can. */
597 if (bufmgr
->bo_reuse
&& bo
->reusable
&& bucket
!= NULL
&&
598 brw_bo_madvise(bo
, I915_MADV_DONTNEED
)) {
599 bo
->free_time
= time
;
604 list_addtail(&bo
->head
, &bucket
->head
);
611 brw_bo_unreference(struct brw_bo
*bo
)
616 assert(p_atomic_read(&bo
->refcount
) > 0);
618 if (atomic_add_unless(&bo
->refcount
, -1, 1)) {
619 struct brw_bufmgr
*bufmgr
= bo
->bufmgr
;
620 struct timespec time
;
622 clock_gettime(CLOCK_MONOTONIC
, &time
);
624 pthread_mutex_lock(&bufmgr
->lock
);
626 if (p_atomic_dec_zero(&bo
->refcount
)) {
627 bo_unreference_final(bo
, time
.tv_sec
);
628 cleanup_bo_cache(bufmgr
, time
.tv_sec
);
631 pthread_mutex_unlock(&bufmgr
->lock
);
636 set_domain(struct brw_context
*brw
, const char *action
,
637 struct brw_bo
*bo
, uint32_t read_domains
, uint32_t write_domain
)
639 struct drm_i915_gem_set_domain sd
= {
640 .handle
= bo
->gem_handle
,
641 .read_domains
= read_domains
,
642 .write_domain
= write_domain
,
645 double elapsed
= unlikely(brw
&& brw
->perf_debug
) ? -get_time() : 0.0;
647 if (drmIoctl(bo
->bufmgr
->fd
, DRM_IOCTL_I915_GEM_SET_DOMAIN
, &sd
) != 0) {
648 DBG("%s:%d: Error setting memory domains %d (%08x %08x): %s.\n",
649 __FILE__
, __LINE__
, bo
->gem_handle
, read_domains
, write_domain
,
653 if (unlikely(brw
&& brw
->perf_debug
)) {
654 elapsed
+= get_time();
655 if (elapsed
> 1e-5) /* 0.01ms */
656 perf_debug("%s a busy \"%s\" BO stalled and took %.03f ms.\n",
657 action
, bo
->name
, elapsed
* 1000);
662 brw_bo_map_cpu(struct brw_context
*brw
, struct brw_bo
*bo
, unsigned flags
)
664 struct brw_bufmgr
*bufmgr
= bo
->bufmgr
;
666 pthread_mutex_lock(&bufmgr
->lock
);
669 struct drm_i915_gem_mmap mmap_arg
;
671 DBG("brw_bo_map_cpu: %d (%s), map_count=%d\n",
672 bo
->gem_handle
, bo
->name
, bo
->map_count
);
675 mmap_arg
.handle
= bo
->gem_handle
;
676 mmap_arg
.size
= bo
->size
;
677 int ret
= drmIoctl(bufmgr
->fd
, DRM_IOCTL_I915_GEM_MMAP
, &mmap_arg
);
680 DBG("%s:%d: Error mapping buffer %d (%s): %s .\n",
681 __FILE__
, __LINE__
, bo
->gem_handle
, bo
->name
, strerror(errno
));
682 pthread_mutex_unlock(&bufmgr
->lock
);
686 VG(VALGRIND_MALLOCLIKE_BLOCK(mmap_arg
.addr_ptr
, mmap_arg
.size
, 0, 1));
687 bo
->map_cpu
= (void *) (uintptr_t) mmap_arg
.addr_ptr
;
689 DBG("brw_bo_map_cpu: %d (%s) -> %p\n", bo
->gem_handle
, bo
->name
,
692 if (!(flags
& MAP_ASYNC
)) {
693 set_domain(brw
, "CPU mapping", bo
, I915_GEM_DOMAIN_CPU
,
694 flags
& MAP_WRITE
? I915_GEM_DOMAIN_CPU
: 0);
697 bo_mark_mmaps_incoherent(bo
);
698 VG(VALGRIND_MAKE_MEM_DEFINED(bo
->map_cpu
, bo
->size
));
699 pthread_mutex_unlock(&bufmgr
->lock
);
705 brw_bo_map_gtt(struct brw_context
*brw
, struct brw_bo
*bo
, unsigned flags
)
707 struct brw_bufmgr
*bufmgr
= bo
->bufmgr
;
709 pthread_mutex_lock(&bufmgr
->lock
);
711 /* Get a mapping of the buffer if we haven't before. */
712 if (bo
->map_gtt
== NULL
) {
713 struct drm_i915_gem_mmap_gtt mmap_arg
;
715 DBG("bo_map_gtt: mmap %d (%s), map_count=%d\n",
716 bo
->gem_handle
, bo
->name
, bo
->map_count
);
719 mmap_arg
.handle
= bo
->gem_handle
;
721 /* Get the fake offset back... */
722 int ret
= drmIoctl(bufmgr
->fd
, DRM_IOCTL_I915_GEM_MMAP_GTT
, &mmap_arg
);
724 DBG("%s:%d: Error preparing buffer map %d (%s): %s .\n",
725 __FILE__
, __LINE__
, bo
->gem_handle
, bo
->name
, strerror(errno
));
726 pthread_mutex_unlock(&bufmgr
->lock
);
731 bo
->map_gtt
= drm_mmap(0, bo
->size
, PROT_READ
| PROT_WRITE
,
732 MAP_SHARED
, bufmgr
->fd
, mmap_arg
.offset
);
733 if (bo
->map_gtt
== MAP_FAILED
) {
735 DBG("%s:%d: Error mapping buffer %d (%s): %s .\n",
736 __FILE__
, __LINE__
, bo
->gem_handle
, bo
->name
, strerror(errno
));
737 pthread_mutex_unlock(&bufmgr
->lock
);
743 DBG("bo_map_gtt: %d (%s) -> %p\n", bo
->gem_handle
, bo
->name
,
746 if (!(flags
& MAP_ASYNC
)) {
747 set_domain(brw
, "GTT mapping", bo
,
748 I915_GEM_DOMAIN_GTT
, I915_GEM_DOMAIN_GTT
);
751 bo_mark_mmaps_incoherent(bo
);
752 VG(VALGRIND_MAKE_MEM_DEFINED(bo
->map_gtt
, bo
->size
));
753 pthread_mutex_unlock(&bufmgr
->lock
);
759 can_map_cpu(struct brw_bo
*bo
, unsigned flags
)
761 if (bo
->cache_coherent
)
764 if (flags
& MAP_PERSISTENT
)
767 if (flags
& MAP_COHERENT
)
770 return !(flags
& MAP_WRITE
);
774 brw_bo_map(struct brw_context
*brw
, struct brw_bo
*bo
, unsigned flags
)
776 if (bo
->tiling_mode
!= I915_TILING_NONE
&& !(flags
& MAP_RAW
))
777 return brw_bo_map_gtt(brw
, bo
, flags
);
778 else if (can_map_cpu(bo
, flags
))
779 return brw_bo_map_cpu(brw
, bo
, flags
);
781 return brw_bo_map_gtt(brw
, bo
, flags
);
785 brw_bo_unmap(struct brw_bo
*bo
)
787 struct brw_bufmgr
*bufmgr
= bo
->bufmgr
;
790 pthread_mutex_lock(&bufmgr
->lock
);
792 if (bo
->map_count
<= 0) {
793 DBG("attempted to unmap an unmapped bo\n");
794 pthread_mutex_unlock(&bufmgr
->lock
);
795 /* Preserve the old behaviour of just treating this as a
796 * no-op rather than reporting the error.
801 if (--bo
->map_count
== 0) {
802 bo_mark_mmaps_incoherent(bo
);
804 pthread_mutex_unlock(&bufmgr
->lock
);
810 brw_bo_subdata(struct brw_bo
*bo
, uint64_t offset
,
811 uint64_t size
, const void *data
)
813 struct brw_bufmgr
*bufmgr
= bo
->bufmgr
;
814 struct drm_i915_gem_pwrite pwrite
;
818 pwrite
.handle
= bo
->gem_handle
;
819 pwrite
.offset
= offset
;
821 pwrite
.data_ptr
= (uint64_t) (uintptr_t) data
;
822 ret
= drmIoctl(bufmgr
->fd
, DRM_IOCTL_I915_GEM_PWRITE
, &pwrite
);
825 DBG("%s:%d: Error writing data to buffer %d: "
826 "(%"PRIu64
" %"PRIu64
") %s .\n",
827 __FILE__
, __LINE__
, bo
->gem_handle
, offset
, size
, strerror(errno
));
834 brw_bo_get_subdata(struct brw_bo
*bo
, uint64_t offset
,
835 uint64_t size
, void *data
)
837 struct brw_bufmgr
*bufmgr
= bo
->bufmgr
;
838 struct drm_i915_gem_pread pread
;
842 pread
.handle
= bo
->gem_handle
;
843 pread
.offset
= offset
;
845 pread
.data_ptr
= (uint64_t) (uintptr_t) data
;
846 ret
= drmIoctl(bufmgr
->fd
, DRM_IOCTL_I915_GEM_PREAD
, &pread
);
849 DBG("%s:%d: Error reading data from buffer %d: "
850 "(%"PRIu64
" %"PRIu64
") %s .\n",
851 __FILE__
, __LINE__
, bo
->gem_handle
, offset
, size
, strerror(errno
));
857 /** Waits for all GPU rendering with the object to have completed. */
859 brw_bo_wait_rendering(struct brw_context
*brw
, struct brw_bo
*bo
)
861 set_domain(brw
, "waiting for",
862 bo
, I915_GEM_DOMAIN_GTT
, I915_GEM_DOMAIN_GTT
);
866 * Waits on a BO for the given amount of time.
868 * @bo: buffer object to wait for
869 * @timeout_ns: amount of time to wait in nanoseconds.
870 * If value is less than 0, an infinite wait will occur.
872 * Returns 0 if the wait was successful ie. the last batch referencing the
873 * object has completed within the allotted time. Otherwise some negative return
874 * value describes the error. Of particular interest is -ETIME when the wait has
875 * failed to yield the desired result.
877 * Similar to brw_bo_wait_rendering except a timeout parameter allows
878 * the operation to give up after a certain amount of time. Another subtle
879 * difference is the internal locking semantics are different (this variant does
880 * not hold the lock for the duration of the wait). This makes the wait subject
881 * to a larger userspace race window.
883 * The implementation shall wait until the object is no longer actively
884 * referenced within a batch buffer at the time of the call. The wait will
885 * not guarantee that the buffer is re-issued via another thread, or an flinked
886 * handle. Userspace must make sure this race does not occur if such precision
889 * Note that some kernels have broken the inifite wait for negative values
890 * promise, upgrade to latest stable kernels if this is the case.
893 brw_bo_wait(struct brw_bo
*bo
, int64_t timeout_ns
)
895 struct brw_bufmgr
*bufmgr
= bo
->bufmgr
;
896 struct drm_i915_gem_wait wait
;
900 wait
.bo_handle
= bo
->gem_handle
;
901 wait
.timeout_ns
= timeout_ns
;
902 ret
= drmIoctl(bufmgr
->fd
, DRM_IOCTL_I915_GEM_WAIT
, &wait
);
910 brw_bufmgr_destroy(struct brw_bufmgr
*bufmgr
)
912 pthread_mutex_destroy(&bufmgr
->lock
);
914 /* Free any cached buffer objects we were going to reuse */
915 for (int i
= 0; i
< bufmgr
->num_buckets
; i
++) {
916 struct bo_cache_bucket
*bucket
= &bufmgr
->cache_bucket
[i
];
918 list_for_each_entry_safe(struct brw_bo
, bo
, &bucket
->head
, head
) {
925 _mesa_hash_table_destroy(bufmgr
->name_table
, NULL
);
926 _mesa_hash_table_destroy(bufmgr
->handle_table
, NULL
);
932 bo_set_tiling_internal(struct brw_bo
*bo
, uint32_t tiling_mode
,
935 struct brw_bufmgr
*bufmgr
= bo
->bufmgr
;
936 struct drm_i915_gem_set_tiling set_tiling
;
939 if (bo
->global_name
== 0 &&
940 tiling_mode
== bo
->tiling_mode
&& stride
== bo
->stride
)
943 memset(&set_tiling
, 0, sizeof(set_tiling
));
945 /* set_tiling is slightly broken and overwrites the
946 * input on the error path, so we have to open code
949 set_tiling
.handle
= bo
->gem_handle
;
950 set_tiling
.tiling_mode
= tiling_mode
;
951 set_tiling
.stride
= stride
;
953 ret
= ioctl(bufmgr
->fd
, DRM_IOCTL_I915_GEM_SET_TILING
, &set_tiling
);
954 } while (ret
== -1 && (errno
== EINTR
|| errno
== EAGAIN
));
958 bo
->tiling_mode
= set_tiling
.tiling_mode
;
959 bo
->swizzle_mode
= set_tiling
.swizzle_mode
;
960 bo
->stride
= set_tiling
.stride
;
965 brw_bo_get_tiling(struct brw_bo
*bo
, uint32_t *tiling_mode
,
966 uint32_t *swizzle_mode
)
968 *tiling_mode
= bo
->tiling_mode
;
969 *swizzle_mode
= bo
->swizzle_mode
;
974 brw_bo_gem_create_from_prime(struct brw_bufmgr
*bufmgr
, int prime_fd
)
979 struct drm_i915_gem_get_tiling get_tiling
;
981 pthread_mutex_lock(&bufmgr
->lock
);
982 ret
= drmPrimeFDToHandle(bufmgr
->fd
, prime_fd
, &handle
);
984 DBG("create_from_prime: failed to obtain handle from fd: %s\n",
986 pthread_mutex_unlock(&bufmgr
->lock
);
991 * See if the kernel has already returned this buffer to us. Just as
992 * for named buffers, we must not create two bo's pointing at the same
995 bo
= hash_find_bo(bufmgr
->handle_table
, handle
);
997 brw_bo_reference(bo
);
1001 bo
= calloc(1, sizeof(*bo
));
1005 p_atomic_set(&bo
->refcount
, 1);
1007 /* Determine size of bo. The fd-to-handle ioctl really should
1008 * return the size, but it doesn't. If we have kernel 3.12 or
1009 * later, we can lseek on the prime fd to get the size. Older
1010 * kernels will just fail, in which case we fall back to the
1011 * provided (estimated or guess size). */
1012 ret
= lseek(prime_fd
, 0, SEEK_END
);
1016 bo
->bufmgr
= bufmgr
;
1018 bo
->gem_handle
= handle
;
1019 _mesa_hash_table_insert(bufmgr
->handle_table
, &bo
->gem_handle
, bo
);
1022 bo
->reusable
= false;
1024 memclear(get_tiling
);
1025 get_tiling
.handle
= bo
->gem_handle
;
1026 if (drmIoctl(bufmgr
->fd
, DRM_IOCTL_I915_GEM_GET_TILING
, &get_tiling
))
1029 bo
->tiling_mode
= get_tiling
.tiling_mode
;
1030 bo
->swizzle_mode
= get_tiling
.swizzle_mode
;
1031 /* XXX stride is unknown */
1034 pthread_mutex_unlock(&bufmgr
->lock
);
1039 pthread_mutex_unlock(&bufmgr
->lock
);
1044 brw_bo_gem_export_to_prime(struct brw_bo
*bo
, int *prime_fd
)
1046 struct brw_bufmgr
*bufmgr
= bo
->bufmgr
;
1048 if (drmPrimeHandleToFD(bufmgr
->fd
, bo
->gem_handle
,
1049 DRM_CLOEXEC
, prime_fd
) != 0)
1052 bo
->reusable
= false;
1058 brw_bo_flink(struct brw_bo
*bo
, uint32_t *name
)
1060 struct brw_bufmgr
*bufmgr
= bo
->bufmgr
;
1062 if (!bo
->global_name
) {
1063 struct drm_gem_flink flink
;
1066 flink
.handle
= bo
->gem_handle
;
1067 if (drmIoctl(bufmgr
->fd
, DRM_IOCTL_GEM_FLINK
, &flink
))
1070 pthread_mutex_lock(&bufmgr
->lock
);
1071 if (!bo
->global_name
) {
1072 bo
->global_name
= flink
.name
;
1073 bo
->reusable
= false;
1075 _mesa_hash_table_insert(bufmgr
->name_table
, &bo
->global_name
, bo
);
1077 pthread_mutex_unlock(&bufmgr
->lock
);
1080 *name
= bo
->global_name
;
1085 * Enables unlimited caching of buffer objects for reuse.
1087 * This is potentially very memory expensive, as the cache at each bucket
1088 * size is only bounded by how many buffers of that size we've managed to have
1089 * in flight at once.
1092 brw_bufmgr_enable_reuse(struct brw_bufmgr
*bufmgr
)
1094 bufmgr
->bo_reuse
= true;
1098 add_bucket(struct brw_bufmgr
*bufmgr
, int size
)
1100 unsigned int i
= bufmgr
->num_buckets
;
1102 assert(i
< ARRAY_SIZE(bufmgr
->cache_bucket
));
1104 list_inithead(&bufmgr
->cache_bucket
[i
].head
);
1105 bufmgr
->cache_bucket
[i
].size
= size
;
1106 bufmgr
->num_buckets
++;
1110 init_cache_buckets(struct brw_bufmgr
*bufmgr
)
1112 uint64_t size
, cache_max_size
= 64 * 1024 * 1024;
1114 /* OK, so power of two buckets was too wasteful of memory.
1115 * Give 3 other sizes between each power of two, to hopefully
1116 * cover things accurately enough. (The alternative is
1117 * probably to just go for exact matching of sizes, and assume
1118 * that for things like composited window resize the tiled
1119 * width/height alignment and rounding of sizes to pages will
1120 * get us useful cache hit rates anyway)
1122 add_bucket(bufmgr
, 4096);
1123 add_bucket(bufmgr
, 4096 * 2);
1124 add_bucket(bufmgr
, 4096 * 3);
1126 /* Initialize the linked lists for BO reuse cache. */
1127 for (size
= 4 * 4096; size
<= cache_max_size
; size
*= 2) {
1128 add_bucket(bufmgr
, size
);
1130 add_bucket(bufmgr
, size
+ size
* 1 / 4);
1131 add_bucket(bufmgr
, size
+ size
* 2 / 4);
1132 add_bucket(bufmgr
, size
+ size
* 3 / 4);
1137 brw_create_hw_context(struct brw_bufmgr
*bufmgr
)
1139 struct drm_i915_gem_context_create create
;
1143 ret
= drmIoctl(bufmgr
->fd
, DRM_IOCTL_I915_GEM_CONTEXT_CREATE
, &create
);
1145 DBG("DRM_IOCTL_I915_GEM_CONTEXT_CREATE failed: %s\n", strerror(errno
));
1149 return create
.ctx_id
;
1153 brw_destroy_hw_context(struct brw_bufmgr
*bufmgr
, uint32_t ctx_id
)
1155 struct drm_i915_gem_context_destroy d
= {.ctx_id
= ctx_id
};
1158 drmIoctl(bufmgr
->fd
, DRM_IOCTL_I915_GEM_CONTEXT_DESTROY
, &d
) != 0) {
1159 fprintf(stderr
, "DRM_IOCTL_I915_GEM_CONTEXT_DESTROY failed: %s\n",
1165 brw_reg_read(struct brw_bufmgr
*bufmgr
, uint32_t offset
, uint64_t *result
)
1167 struct drm_i915_reg_read reg_read
;
1171 reg_read
.offset
= offset
;
1173 ret
= drmIoctl(bufmgr
->fd
, DRM_IOCTL_I915_REG_READ
, ®_read
);
1175 *result
= reg_read
.val
;
1180 * Initializes the GEM buffer manager, which uses the kernel to allocate, map,
1181 * and manage map buffer objections.
1183 * \param fd File descriptor of the opened DRM device.
1186 brw_bufmgr_init(struct gen_device_info
*devinfo
, int fd
, int batch_size
)
1188 struct brw_bufmgr
*bufmgr
;
1190 bufmgr
= calloc(1, sizeof(*bufmgr
));
1194 /* Handles to buffer objects belong to the device fd and are not
1195 * reference counted by the kernel. If the same fd is used by
1196 * multiple parties (threads sharing the same screen bufmgr, or
1197 * even worse the same device fd passed to multiple libraries)
1198 * ownership of those handles is shared by those independent parties.
1200 * Don't do this! Ensure that each library/bufmgr has its own device
1201 * fd so that its namespace does not clash with another.
1205 if (pthread_mutex_init(&bufmgr
->lock
, NULL
) != 0) {
1210 bufmgr
->has_llc
= devinfo
->has_llc
;
1212 init_cache_buckets(bufmgr
);
1214 bufmgr
->name_table
=
1215 _mesa_hash_table_create(NULL
, key_hash_uint
, key_uint_equal
);
1216 bufmgr
->handle_table
=
1217 _mesa_hash_table_create(NULL
, key_hash_uint
, key_uint_equal
);