[Mesa-dev] [RFC PATCH] radeonsi: set a per-buffer flag that disables inter-process sharing (v2)
zhoucm1
david1.zhou at amd.com
Thu Jul 20 02:20:56 UTC 2017
On 2017年07月19日 23:34, Marek Olšák wrote:
>
>
> On Jul 19, 2017 3:36 AM, "zhoucm1" <david1.zhou at amd.com
> <mailto:david1.zhou at amd.com>> wrote:
>
>
>
> On 2017年07月19日 04:08, Marek Olšák wrote:
>
> From: Marek Olšák <marek.olsak at amd.com
> <mailto: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?
>
>
> The kernel part of the work hasn't been done yet. The idea is that
> nonsharable buffers don't have to be revalidated by TTM,
OK, Maybe I only can see the whole picture of this idea when you
complete kernel part.
Out of curious, why/how can nonsharable buffers be revalidated by TTM
without exposing like amdgpu_bo_make_resident api?
With mentioned in another thread, if we can expose make_resident api, we
can remove bo_list, even we can remove reservation operation in CS ioctl.
And now, I think our bo list is a very bad design,
first, umd must create bo list for every command submission, this is a
extra cpu overhead compared with traditional way.
second, kernel also have to iterate the list, when bo list is too long,
like OpenCL program, they always throw several thousands BOs to bo list,
reservation must keep these thousands ww_mutex safe, CPU overhead is too
big.
So I strongly suggest we should expose make_resident api to user space.
if cannot, I want to know any specific reason to see if we can solve it.
Regards,
David Zhou
> so it should remove a lot of kernel overhead and the BO list remains
> the same.
>
> Marek
>
>
>
> 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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