To improve cpu read performance. This is implemented for APUs currently. v2: Adapt to change https://lists.freedesktop.org/archives/amd-gfx/2017-October/015174.html v3: Adapt to change "forward begin_cpu_access callback to drivers" Change-Id: I7a583e23a9ee706e0edd2a46f4e4186a609368e3 --- drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 + drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 1 + drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c | 26 ++++++++++++++++++++++++++ 3 files changed, 28 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h index f8657c3..4204d87 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h @@ -420,6 +420,7 @@ struct dma_buf *amdgpu_gem_prime_export(struct drm_device *dev, int amdgpu_gem_prime_pin(struct drm_gem_object *obj); void amdgpu_gem_prime_unpin(struct drm_gem_object *obj); struct reservation_object *amdgpu_gem_prime_res_obj(struct drm_gem_object *); +int amdgpu_gem_prime_begin_cpu_access(struct drm_gem_object *obj, enum dma_data_direction direction); void *amdgpu_gem_prime_vmap(struct drm_gem_object *obj); void amdgpu_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr); int amdgpu_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma); diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c index 31383e0..87d05b5 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c @@ -874,6 +874,7 @@ static struct drm_driver kms_driver = { .gem_prime_res_obj = amdgpu_gem_prime_res_obj, .gem_prime_get_sg_table = amdgpu_gem_prime_get_sg_table, .gem_prime_import_sg_table = amdgpu_gem_prime_import_sg_table, + .gem_prime_begin_cpu_access = amdgpu_gem_prime_begin_cpu_access, .gem_prime_vmap = amdgpu_gem_prime_vmap, .gem_prime_vunmap = amdgpu_gem_prime_vunmap, .gem_prime_mmap = amdgpu_gem_prime_mmap, diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c index ae9c106..1f5063e 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c @@ -26,6 +26,7 @@ #include <drm/drmP.h> #include "amdgpu.h" +#include "amdgpu_display.h" #include <drm/amdgpu_drm.h> #include <linux/dma-buf.h> @@ -164,6 +165,30 @@ struct reservation_object *amdgpu_gem_prime_res_obj(struct drm_gem_object *obj) return bo->tbo.resv; } +int amdgpu_gem_prime_begin_cpu_access(struct drm_gem_object *obj, enum dma_data_direction direction) +{ + struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj); + struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev); + struct ttm_operation_ctx ctx = { true, false }; + u32 domain = amdgpu_framebuffer_domains(adev); + long ret = 0; + bool reads = (direction == DMA_BIDIRECTIONAL || direction == DMA_FROM_DEVICE); + + if (!reads || !(domain & AMDGPU_GEM_DOMAIN_GTT) || bo->pin_count) + return 0; + + /* move to gtt */ + ret = amdgpu_bo_reserve(bo, false); + if (unlikely(ret != 0)) + return ret; + + amdgpu_ttm_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_GTT); + ret = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx); + + amdgpu_bo_unreserve(bo); + return ret; +} + struct dma_buf *amdgpu_gem_prime_export(struct drm_device *dev, struct drm_gem_object *gobj, int flags) @@ -178,5 +203,6 @@ struct dma_buf *amdgpu_gem_prime_export(struct drm_device *dev, buf = drm_gem_prime_export(dev, gobj, flags); if (!IS_ERR(buf)) buf->file->f_mapping = dev->anon_inode->i_mapping; + return buf; } -- 2.7.4
