[Mesa-dev] [RFC PATCH] radeonsi: set a per-buffer flag that disables inter-process sharing (v2)
zhoucm1
david1.zhou at amd.com
Wed Jul 19 07:35:51 UTC 2017
On 2017年07月19日 04:08, Marek Olšák wrote:
> From: Marek Olšák <marek.olsak at amd.com>
>
> For lower overhead in the CS ioctl.
> Winsys allocators are not used with interprocess-sharable resources.
Hi Marek,
Could I know from how your this way reduces overhead in CS ioctl?
reusing BO to short bo list?
Thanks,
David Zhou
>
> v2: It shouldn't crash anymore, but the kernel will reject the new flag.
> ---
> src/gallium/drivers/radeon/r600_buffer_common.c | 7 +++++
> src/gallium/drivers/radeon/radeon_winsys.h | 20 +++++++++++---
> src/gallium/winsys/amdgpu/drm/amdgpu_bo.c | 36 ++++++++++++++++---------
> src/gallium/winsys/radeon/drm/radeon_drm_bo.c | 27 +++++++++++--------
> 4 files changed, 62 insertions(+), 28 deletions(-)
>
> diff --git a/src/gallium/drivers/radeon/r600_buffer_common.c b/src/gallium/drivers/radeon/r600_buffer_common.c
> index dd1c209..2747ac4 100644
> --- a/src/gallium/drivers/radeon/r600_buffer_common.c
> +++ b/src/gallium/drivers/radeon/r600_buffer_common.c
> @@ -160,20 +160,27 @@ void r600_init_resource_fields(struct r600_common_screen *rscreen,
> }
>
> /* Tiled textures are unmappable. Always put them in VRAM. */
> if ((res->b.b.target != PIPE_BUFFER && !rtex->surface.is_linear) ||
> res->flags & R600_RESOURCE_FLAG_UNMAPPABLE) {
> res->domains = RADEON_DOMAIN_VRAM;
> res->flags |= RADEON_FLAG_NO_CPU_ACCESS |
> RADEON_FLAG_GTT_WC;
> }
>
> + /* Only displayable single-sample textures can be shared between
> + * processes. */
> + if (res->b.b.target == PIPE_BUFFER ||
> + res->b.b.nr_samples >= 2 ||
> + rtex->surface.micro_tile_mode != RADEON_MICRO_MODE_DISPLAY)
> + res->flags |= RADEON_FLAG_NO_INTERPROCESS_SHARING;
> +
> /* If VRAM is just stolen system memory, allow both VRAM and
> * GTT, whichever has free space. If a buffer is evicted from
> * VRAM to GTT, it will stay there.
> *
> * DRM 3.6.0 has good BO move throttling, so we can allow VRAM-only
> * placements even with a low amount of stolen VRAM.
> */
> if (!rscreen->info.has_dedicated_vram &&
> (rscreen->info.drm_major < 3 || rscreen->info.drm_minor < 6) &&
> res->domains == RADEON_DOMAIN_VRAM) {
> diff --git a/src/gallium/drivers/radeon/radeon_winsys.h b/src/gallium/drivers/radeon/radeon_winsys.h
> index 351edcd..0abcb56 100644
> --- a/src/gallium/drivers/radeon/radeon_winsys.h
> +++ b/src/gallium/drivers/radeon/radeon_winsys.h
> @@ -47,20 +47,21 @@ enum radeon_bo_domain { /* bitfield */
> RADEON_DOMAIN_GTT = 2,
> RADEON_DOMAIN_VRAM = 4,
> RADEON_DOMAIN_VRAM_GTT = RADEON_DOMAIN_VRAM | RADEON_DOMAIN_GTT
> };
>
> enum radeon_bo_flag { /* bitfield */
> RADEON_FLAG_GTT_WC = (1 << 0),
> RADEON_FLAG_NO_CPU_ACCESS = (1 << 1),
> RADEON_FLAG_NO_SUBALLOC = (1 << 2),
> RADEON_FLAG_SPARSE = (1 << 3),
> + RADEON_FLAG_NO_INTERPROCESS_SHARING = (1 << 4),
> };
>
> enum radeon_bo_usage { /* bitfield */
> RADEON_USAGE_READ = 2,
> RADEON_USAGE_WRITE = 4,
> RADEON_USAGE_READWRITE = RADEON_USAGE_READ | RADEON_USAGE_WRITE,
>
> /* The winsys ensures that the CS submission will be scheduled after
> * previously flushed CSs referencing this BO in a conflicting way.
> */
> @@ -685,28 +686,33 @@ static inline enum radeon_bo_domain radeon_domain_from_heap(enum radeon_heap hea
> default:
> assert(0);
> return (enum radeon_bo_domain)0;
> }
> }
>
> static inline unsigned radeon_flags_from_heap(enum radeon_heap heap)
> {
> switch (heap) {
> case RADEON_HEAP_VRAM_NO_CPU_ACCESS:
> - return RADEON_FLAG_GTT_WC | RADEON_FLAG_NO_CPU_ACCESS;
> + return RADEON_FLAG_GTT_WC |
> + RADEON_FLAG_NO_CPU_ACCESS |
> + RADEON_FLAG_NO_INTERPROCESS_SHARING;
> +
> case RADEON_HEAP_VRAM:
> case RADEON_HEAP_VRAM_GTT:
> case RADEON_HEAP_GTT_WC:
> - return RADEON_FLAG_GTT_WC;
> + return RADEON_FLAG_GTT_WC |
> + RADEON_FLAG_NO_INTERPROCESS_SHARING;
> +
> case RADEON_HEAP_GTT:
> default:
> - return 0;
> + return RADEON_FLAG_NO_INTERPROCESS_SHARING;
> }
> }
>
> /* The pb cache bucket is chosen to minimize pb_cache misses.
> * It must be between 0 and 3 inclusive.
> */
> static inline unsigned radeon_get_pb_cache_bucket_index(enum radeon_heap heap)
> {
> switch (heap) {
> case RADEON_HEAP_VRAM_NO_CPU_ACCESS:
> @@ -724,22 +730,28 @@ static inline unsigned radeon_get_pb_cache_bucket_index(enum radeon_heap heap)
>
> /* Return the heap index for winsys allocators, or -1 on failure. */
> static inline int radeon_get_heap_index(enum radeon_bo_domain domain,
> enum radeon_bo_flag flags)
> {
> /* VRAM implies WC (write combining) */
> assert(!(domain & RADEON_DOMAIN_VRAM) || flags & RADEON_FLAG_GTT_WC);
> /* NO_CPU_ACCESS implies VRAM only. */
> assert(!(flags & RADEON_FLAG_NO_CPU_ACCESS) || domain == RADEON_DOMAIN_VRAM);
>
> + /* Resources with interprocess sharing don't use any winsys allocators. */
> + if (!(flags & RADEON_FLAG_NO_INTERPROCESS_SHARING))
> + return -1;
> +
> /* Unsupported flags: NO_SUBALLOC, SPARSE. */
> - if (flags & ~(RADEON_FLAG_GTT_WC | RADEON_FLAG_NO_CPU_ACCESS))
> + if (flags & ~(RADEON_FLAG_GTT_WC |
> + RADEON_FLAG_NO_CPU_ACCESS |
> + RADEON_FLAG_NO_INTERPROCESS_SHARING))
> return -1;
>
> switch (domain) {
> case RADEON_DOMAIN_VRAM:
> if (flags & RADEON_FLAG_NO_CPU_ACCESS)
> return RADEON_HEAP_VRAM_NO_CPU_ACCESS;
> else
> return RADEON_HEAP_VRAM;
> case RADEON_DOMAIN_VRAM_GTT:
> return RADEON_HEAP_VRAM_GTT;
> diff --git a/src/gallium/winsys/amdgpu/drm/amdgpu_bo.c b/src/gallium/winsys/amdgpu/drm/amdgpu_bo.c
> index 97bbe23..06b8198 100644
> --- a/src/gallium/winsys/amdgpu/drm/amdgpu_bo.c
> +++ b/src/gallium/winsys/amdgpu/drm/amdgpu_bo.c
> @@ -31,20 +31,24 @@
>
> #include "amdgpu_cs.h"
>
> #include "os/os_time.h"
> #include "state_tracker/drm_driver.h"
> #include <amdgpu_drm.h>
> #include <xf86drm.h>
> #include <stdio.h>
> #include <inttypes.h>
>
> +#ifndef AMDGPU_GEM_CREATE_NO_INTERPROCESS_SHARING
> +#define AMDGPU_GEM_CREATE_NO_INTERPROCESS_SHARING (1 << 6)
> +#endif
> +
> /* Set to 1 for verbose output showing committed sparse buffer ranges. */
> #define DEBUG_SPARSE_COMMITS 0
>
> struct amdgpu_sparse_backing_chunk {
> uint32_t begin, end;
> };
>
> static struct pb_buffer *
> amdgpu_bo_create(struct radeon_winsys *rws,
> uint64_t size,
> @@ -395,20 +399,22 @@ static struct amdgpu_winsys_bo *amdgpu_create_bo(struct amdgpu_winsys *ws,
>
> if (initial_domain & RADEON_DOMAIN_VRAM)
> request.preferred_heap |= AMDGPU_GEM_DOMAIN_VRAM;
> if (initial_domain & RADEON_DOMAIN_GTT)
> request.preferred_heap |= AMDGPU_GEM_DOMAIN_GTT;
>
> if (flags & RADEON_FLAG_NO_CPU_ACCESS)
> request.flags |= AMDGPU_GEM_CREATE_NO_CPU_ACCESS;
> if (flags & RADEON_FLAG_GTT_WC)
> request.flags |= AMDGPU_GEM_CREATE_CPU_GTT_USWC;
> + if (flags & RADEON_FLAG_NO_INTERPROCESS_SHARING)
> + request.flags |= AMDGPU_GEM_CREATE_NO_INTERPROCESS_SHARING;
>
> r = amdgpu_bo_alloc(ws->dev, &request, &buf_handle);
> if (r) {
> fprintf(stderr, "amdgpu: Failed to allocate a buffer:\n");
> fprintf(stderr, "amdgpu: size : %"PRIu64" bytes\n", size);
> fprintf(stderr, "amdgpu: alignment : %u bytes\n", alignment);
> fprintf(stderr, "amdgpu: domains : %u\n", initial_domain);
> goto error_bo_alloc;
> }
>
> @@ -1127,21 +1133,21 @@ static void amdgpu_buffer_set_metadata(struct pb_buffer *_buf,
>
> static struct pb_buffer *
> amdgpu_bo_create(struct radeon_winsys *rws,
> uint64_t size,
> unsigned alignment,
> enum radeon_bo_domain domain,
> enum radeon_bo_flag flags)
> {
> struct amdgpu_winsys *ws = amdgpu_winsys(rws);
> struct amdgpu_winsys_bo *bo;
> - unsigned usage = 0, pb_cache_bucket;
> + unsigned usage = 0, pb_cache_bucket = 0;
>
> /* VRAM implies WC. This is not optional. */
> assert(!(domain & RADEON_DOMAIN_VRAM) || flags & RADEON_FLAG_GTT_WC);
>
> /* NO_CPU_ACCESS is valid with VRAM only. */
> assert(domain == RADEON_DOMAIN_VRAM || !(flags & RADEON_FLAG_NO_CPU_ACCESS));
>
> /* Sub-allocate small buffers from slabs. */
> if (!(flags & (RADEON_FLAG_NO_SUBALLOC | RADEON_FLAG_SPARSE)) &&
> size <= (1 << AMDGPU_SLAB_MAX_SIZE_LOG2) &&
> @@ -1182,48 +1188,52 @@ no_slab:
> /* This flag is irrelevant for the cache. */
> flags &= ~RADEON_FLAG_NO_SUBALLOC;
>
> /* Align size to page size. This is the minimum alignment for normal
> * BOs. Aligning this here helps the cached bufmgr. Especially small BOs,
> * like constant/uniform buffers, can benefit from better and more reuse.
> */
> size = align64(size, ws->info.gart_page_size);
> alignment = align(alignment, ws->info.gart_page_size);
>
> - int heap = radeon_get_heap_index(domain, flags);
> - assert(heap >= 0 && heap < RADEON_MAX_CACHED_HEAPS);
> - usage = 1 << heap; /* Only set one usage bit for each heap. */
> + bool use_reusable_pool = flags & RADEON_FLAG_NO_INTERPROCESS_SHARING;
>
> - pb_cache_bucket = radeon_get_pb_cache_bucket_index(heap);
> - assert(pb_cache_bucket < ARRAY_SIZE(ws->bo_cache.buckets));
> + if (use_reusable_pool) {
> + int heap = radeon_get_heap_index(domain, flags);
> + assert(heap >= 0 && heap < RADEON_MAX_CACHED_HEAPS);
> + usage = 1 << heap; /* Only set one usage bit for each heap. */
>
> - /* Get a buffer from the cache. */
> - bo = (struct amdgpu_winsys_bo*)
> - pb_cache_reclaim_buffer(&ws->bo_cache, size, alignment, usage,
> - pb_cache_bucket);
> - if (bo)
> - return &bo->base;
> + pb_cache_bucket = radeon_get_pb_cache_bucket_index(heap);
> + assert(pb_cache_bucket < ARRAY_SIZE(ws->bo_cache.buckets));
> +
> + /* Get a buffer from the cache. */
> + bo = (struct amdgpu_winsys_bo*)
> + pb_cache_reclaim_buffer(&ws->bo_cache, size, alignment, usage,
> + pb_cache_bucket);
> + if (bo)
> + return &bo->base;
> + }
>
> /* Create a new one. */
> bo = amdgpu_create_bo(ws, size, alignment, usage, domain, flags,
> pb_cache_bucket);
> if (!bo) {
> /* Clear the cache and try again. */
> pb_slabs_reclaim(&ws->bo_slabs);
> pb_cache_release_all_buffers(&ws->bo_cache);
> bo = amdgpu_create_bo(ws, size, alignment, usage, domain, flags,
> pb_cache_bucket);
> if (!bo)
> return NULL;
> }
>
> - bo->u.real.use_reusable_pool = true;
> + bo->u.real.use_reusable_pool = use_reusable_pool;
> return &bo->base;
> }
>
> static struct pb_buffer *amdgpu_bo_from_handle(struct radeon_winsys *rws,
> struct winsys_handle *whandle,
> unsigned *stride,
> unsigned *offset)
> {
> struct amdgpu_winsys *ws = amdgpu_winsys(rws);
> struct amdgpu_winsys_bo *bo;
> diff --git a/src/gallium/winsys/radeon/drm/radeon_drm_bo.c b/src/gallium/winsys/radeon/drm/radeon_drm_bo.c
> index 8027a5f..15e9d38 100644
> --- a/src/gallium/winsys/radeon/drm/radeon_drm_bo.c
> +++ b/src/gallium/winsys/radeon/drm/radeon_drm_bo.c
> @@ -907,21 +907,21 @@ static void radeon_bo_set_metadata(struct pb_buffer *_buf,
>
> static struct pb_buffer *
> radeon_winsys_bo_create(struct radeon_winsys *rws,
> uint64_t size,
> unsigned alignment,
> enum radeon_bo_domain domain,
> enum radeon_bo_flag flags)
> {
> struct radeon_drm_winsys *ws = radeon_drm_winsys(rws);
> struct radeon_bo *bo;
> - unsigned usage = 0, pb_cache_bucket;
> + unsigned usage = 0, pb_cache_bucket = 0;
>
> assert(!(flags & RADEON_FLAG_SPARSE)); /* not supported */
>
> /* Only 32-bit sizes are supported. */
> if (size > UINT_MAX)
> return NULL;
>
> /* VRAM implies WC. This is not optional. */
> if (domain & RADEON_DOMAIN_VRAM)
> flags |= RADEON_FLAG_GTT_WC;
> @@ -962,46 +962,51 @@ no_slab:
> /* This flag is irrelevant for the cache. */
> flags &= ~RADEON_FLAG_NO_SUBALLOC;
>
> /* Align size to page size. This is the minimum alignment for normal
> * BOs. Aligning this here helps the cached bufmgr. Especially small BOs,
> * like constant/uniform buffers, can benefit from better and more reuse.
> */
> size = align(size, ws->info.gart_page_size);
> alignment = align(alignment, ws->info.gart_page_size);
>
> - int heap = radeon_get_heap_index(domain, flags);
> - assert(heap >= 0 && heap < RADEON_MAX_CACHED_HEAPS);
> - usage = 1 << heap; /* Only set one usage bit for each heap. */
> + bool use_reusable_pool = flags & RADEON_FLAG_NO_INTERPROCESS_SHARING;
>
> - pb_cache_bucket = radeon_get_pb_cache_bucket_index(heap);
> - assert(pb_cache_bucket < ARRAY_SIZE(ws->bo_cache.buckets));
> + /* Shared resources don't use cached heaps. */
> + if (use_reusable_pool) {
> + int heap = radeon_get_heap_index(domain, flags);
> + assert(heap >= 0 && heap < RADEON_MAX_CACHED_HEAPS);
> + usage = 1 << heap; /* Only set one usage bit for each heap. */
>
> - bo = radeon_bo(pb_cache_reclaim_buffer(&ws->bo_cache, size, alignment,
> - usage, pb_cache_bucket));
> - if (bo)
> - return &bo->base;
> + pb_cache_bucket = radeon_get_pb_cache_bucket_index(heap);
> + assert(pb_cache_bucket < ARRAY_SIZE(ws->bo_cache.buckets));
> +
> + bo = radeon_bo(pb_cache_reclaim_buffer(&ws->bo_cache, size, alignment,
> + usage, pb_cache_bucket));
> + if (bo)
> + return &bo->base;
> + }
>
> bo = radeon_create_bo(ws, size, alignment, usage, domain, flags,
> pb_cache_bucket);
> if (!bo) {
> /* Clear the cache and try again. */
> if (ws->info.has_virtual_memory)
> pb_slabs_reclaim(&ws->bo_slabs);
> pb_cache_release_all_buffers(&ws->bo_cache);
> bo = radeon_create_bo(ws, size, alignment, usage, domain, flags,
> pb_cache_bucket);
> if (!bo)
> return NULL;
> }
>
> - bo->u.real.use_reusable_pool = true;
> + bo->u.real.use_reusable_pool = use_reusable_pool;
>
> mtx_lock(&ws->bo_handles_mutex);
> util_hash_table_set(ws->bo_handles, (void*)(uintptr_t)bo->handle, bo);
> mtx_unlock(&ws->bo_handles_mutex);
>
> return &bo->base;
> }
>
> static struct pb_buffer *radeon_winsys_bo_from_ptr(struct radeon_winsys *rws,
> void *pointer, uint64_t size)
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