The biggest user of i915_gem_object_get_page() is the relocation processing during execbuffer. Typically userspace passes in a set of relocations in sorted order. Sadly, we alternate between relocations increasing from the start of the buffers, and relocations decreasing from the end. However the majority of consecutive lookups will still be in the same page. We could cache the start of the last sg chain, however for most callers, the entire sgl is inside a single chain and so we see no improve from the extra layer of caching. References: https://bugs.freedesktop.org/show_bug.cgi?id=88308 Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/i915_drv.h | 31 ++++++++++++++++++++++++++----- drivers/gpu/drm/i915/i915_gem.c | 4 ++++ 2 files changed, 30 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 66f0c607dbef..04a7d594d933 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -2005,6 +2005,10 @@ struct drm_i915_gem_object { struct sg_table *pages; int pages_pin_count; + struct get_page { + struct scatterlist *sg; + int last; + } get_page; /* prime dma-buf support */ void *dma_buf_vmapping; @@ -2612,15 +2616,32 @@ int i915_gem_obj_prepare_shmem_read(struct drm_i915_gem_object *obj, int *needs_clflush); int __must_check i915_gem_object_get_pages(struct drm_i915_gem_object *obj); -static inline struct page *i915_gem_object_get_page(struct drm_i915_gem_object *obj, int n) + +static inline int sg_page_count(struct scatterlist *sg) +{ + return PAGE_ALIGN(sg->offset + sg->length) >> PAGE_SHIFT; +} + +static inline struct page * +i915_gem_object_get_page(struct drm_i915_gem_object *obj, int n) { - struct sg_page_iter sg_iter; + if (WARN_ON(n >= obj->base.size >> PAGE_SHIFT)) + return NULL; - for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, n) - return sg_page_iter_page(&sg_iter); + if (n < obj->get_page.last) { + obj->get_page.sg = obj->pages->sgl; + obj->get_page.last = 0; + } + + while (obj->get_page.last + sg_page_count(obj->get_page.sg) <= n) { + obj->get_page.last += sg_page_count(obj->get_page.sg); + if (unlikely(sg_is_chain(++obj->get_page.sg))) + obj->get_page.sg = sg_chain_ptr(obj->get_page.sg); + } - return NULL; + return nth_page(sg_page(obj->get_page.sg), n - obj->get_page.last); } + static inline void i915_gem_object_pin_pages(struct drm_i915_gem_object *obj) { BUG_ON(obj->pages == NULL); diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 6c403654e33a..d710da099bdb 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -2260,6 +2260,10 @@ i915_gem_object_get_pages(struct drm_i915_gem_object *obj) return ret; list_add_tail(&obj->global_list, &dev_priv->mm.unbound_list); + + obj->get_page.sg = obj->pages->sgl; + obj->get_page.last = 0; + return 0; } -- 2.1.4 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
