From 95ff7c7dd7098860bc131c7dec0ad76ca61e796a Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Fri, 16 Jun 2017 15:05:25 +0100 Subject: [PATCH] drm/i915: Stash a pointer to the obj's resv in the vma During execbuf, a mandatory step is that we add this request (this fence) to each object's reservation_object. Inside execbuf, we track the vma, and to add the fence to the reservation_object then means having to first chase the obj, incurring another cache miss. We can reduce the number of cache misses by stashing a pointer to the reservation_object in the vma itself. Signed-off-by: Chris Wilson Reviewed-by: Joonas Lahtinen Link: http://patchwork.freedesktop.org/patch/msgid/20170616140525.6394-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_gem_execbuffer.c | 25 ++++++++++++------------- drivers/gpu/drm/i915/i915_vma.c | 1 + drivers/gpu/drm/i915/i915_vma.h | 3 ++- 3 files changed, 15 insertions(+), 14 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c index 2f7a2d2..eb46dfa 100644 --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c @@ -1192,17 +1192,17 @@ static int __reloc_gpu_alloc(struct i915_execbuffer *eb, if (err) goto err_request; - GEM_BUG_ON(!reservation_object_test_signaled_rcu(obj->resv, true)); + GEM_BUG_ON(!reservation_object_test_signaled_rcu(batch->resv, true)); i915_vma_move_to_active(batch, rq, 0); - reservation_object_lock(obj->resv, NULL); - reservation_object_add_excl_fence(obj->resv, &rq->fence); - reservation_object_unlock(obj->resv); + reservation_object_lock(batch->resv, NULL); + reservation_object_add_excl_fence(batch->resv, &rq->fence); + reservation_object_unlock(batch->resv); i915_vma_unpin(batch); i915_vma_move_to_active(vma, rq, true); - reservation_object_lock(vma->obj->resv, NULL); - reservation_object_add_excl_fence(vma->obj->resv, &rq->fence); - reservation_object_unlock(vma->obj->resv); + reservation_object_lock(vma->resv, NULL); + reservation_object_add_excl_fence(vma->resv, &rq->fence); + reservation_object_unlock(vma->resv); rq->batch = batch; @@ -1252,7 +1252,6 @@ relocate_entry(struct i915_vma *vma, struct i915_execbuffer *eb, const struct i915_vma *target) { - struct drm_i915_gem_object *obj = vma->obj; u64 offset = reloc->offset; u64 target_offset = relocation_target(reloc, target); bool wide = eb->reloc_cache.use_64bit_reloc; @@ -1260,7 +1259,7 @@ relocate_entry(struct i915_vma *vma, if (!eb->reloc_cache.vaddr && (DBG_FORCE_RELOC == FORCE_GPU_RELOC || - !reservation_object_test_signaled_rcu(obj->resv, true))) { + !reservation_object_test_signaled_rcu(vma->resv, true))) { const unsigned int gen = eb->reloc_cache.gen; unsigned int len; u32 *batch; @@ -1320,7 +1319,7 @@ relocate_entry(struct i915_vma *vma, } repeat: - vaddr = reloc_vaddr(obj, &eb->reloc_cache, offset >> PAGE_SHIFT); + vaddr = reloc_vaddr(vma->obj, &eb->reloc_cache, offset >> PAGE_SHIFT); if (IS_ERR(vaddr)) return PTR_ERR(vaddr); @@ -1793,11 +1792,11 @@ slow: return eb_relocate_slow(eb); } -static void eb_export_fence(struct drm_i915_gem_object *obj, +static void eb_export_fence(struct i915_vma *vma, struct drm_i915_gem_request *req, unsigned int flags) { - struct reservation_object *resv = obj->resv; + struct reservation_object *resv = vma->resv; /* * Ignore errors from failing to allocate the new fence, we can't @@ -1856,7 +1855,7 @@ skip_flushes: const struct drm_i915_gem_exec_object2 *entry = &eb->exec[i]; struct i915_vma *vma = exec_to_vma(entry); - eb_export_fence(vma->obj, eb->request, entry->flags); + eb_export_fence(vma, eb->request, entry->flags); if (unlikely(entry->flags & __EXEC_OBJECT_HAS_REF)) i915_vma_put(vma); } diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c index f5c57df..532c709 100644 --- a/drivers/gpu/drm/i915/i915_vma.c +++ b/drivers/gpu/drm/i915/i915_vma.c @@ -90,6 +90,7 @@ vma_create(struct drm_i915_gem_object *obj, init_request_active(&vma->last_fence, NULL); vma->vm = vm; vma->obj = obj; + vma->resv = obj->resv; vma->size = obj->base.size; vma->display_alignment = I915_GTT_MIN_ALIGNMENT; diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h index 04d7a5d..4a673fc 100644 --- a/drivers/gpu/drm/i915/i915_vma.h +++ b/drivers/gpu/drm/i915/i915_vma.h @@ -50,6 +50,7 @@ struct i915_vma { struct drm_i915_gem_object *obj; struct i915_address_space *vm; struct drm_i915_fence_reg *fence; + struct reservation_object *resv; /** Alias of obj->resv */ struct sg_table *pages; void __iomem *iomap; u64 size; @@ -111,8 +112,8 @@ struct i915_vma { /** * Used for performing relocations during execbuffer insertion. */ - struct hlist_node exec_node; struct drm_i915_gem_exec_object2 *exec_entry; + struct hlist_node exec_node; u32 exec_handle; struct i915_gem_context *ctx; -- 2.7.4