Am 04.01.2018 um 22:12 schrieb Samuel Li:
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"
v4: Instead of v3, reuse drm_gem dmabuf_ops here. Also some minor fixes as suggested.
Change-Id: I7a583e23a9ee706e0edd2a46f4e4186a609368e3
Signed-off-by: Samuel Li <Samuel.Li@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 2 +
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c | 67 +++++++++++++++++++++++++++++++
3 files changed, 70 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index f8657c3..193db70 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -417,6 +417,8 @@ amdgpu_gem_prime_import_sg_table(struct drm_device *dev,
struct dma_buf *amdgpu_gem_prime_export(struct drm_device *dev,
struct drm_gem_object *gobj,
int flags);
+struct drm_gem_object *amdgpu_gem_prime_import(struct drm_device *dev,
+ struct dma_buf *dma_buf);
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 *);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 31383e0..df30b08 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -868,7 +868,7 @@ static struct drm_driver kms_driver = {
.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
.gem_prime_export = amdgpu_gem_prime_export,
- .gem_prime_import = drm_gem_prime_import,
+ .gem_prime_import = amdgpu_gem_prime_import,
.gem_prime_pin = amdgpu_gem_prime_pin,
.gem_prime_unpin = amdgpu_gem_prime_unpin,
.gem_prime_res_obj = amdgpu_gem_prime_res_obj,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c
index ae9c106..283b523 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 +165,50 @@ struct reservation_object *amdgpu_gem_prime_res_obj(struct drm_gem_object *obj)
return bo->tbo.resv;
}
+static int amdgpu_gem_begin_cpu_access(struct dma_buf *dma_buf,
+ enum dma_data_direction direction)
+{
+ struct amdgpu_bo *bo = gem_to_amdgpu_bo(dma_buf->priv);
+ struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
+ struct ttm_operation_ctx ctx = { true, false };
+ u32 domain = amdgpu_framebuffer_domains(adev);
+ int ret = 0;
Style nit pick: Drop the initializer and make that the last variable
declared.
Apart from that the patch is Reviewed-by: Christian König
<christian.koenig@xxxxxxx>.
Regards,
Christian.
+ bool reads = (direction == DMA_BIDIRECTIONAL ||
+ direction == DMA_FROM_DEVICE);
+
+ if (!reads || !(domain & AMDGPU_GEM_DOMAIN_GTT))
+ return 0;
+
+ /* move to gtt */
+ ret = amdgpu_bo_reserve(bo, false);
+ if (unlikely(ret != 0))
+ return ret;
+
+ if (!bo->pin_count && (bo->allowed_domains & AMDGPU_GEM_DOMAIN_GTT)) {
+ 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;
+}
+
+static const struct dma_buf_ops amdgpu_dmabuf_ops = {
+ .attach = drm_gem_map_attach,
+ .detach = drm_gem_map_detach,
+ .map_dma_buf = drm_gem_map_dma_buf,
+ .unmap_dma_buf = drm_gem_unmap_dma_buf,
+ .release = drm_gem_dmabuf_release,
+ .begin_cpu_access = amdgpu_gem_begin_cpu_access,
+ .map = drm_gem_dmabuf_kmap,
+ .map_atomic = drm_gem_dmabuf_kmap_atomic,
+ .unmap = drm_gem_dmabuf_kunmap,
+ .unmap_atomic = drm_gem_dmabuf_kunmap_atomic,
+ .mmap = drm_gem_dmabuf_mmap,
+ .vmap = drm_gem_dmabuf_vmap,
+ .vunmap = drm_gem_dmabuf_vunmap,
+};
+
struct dma_buf *amdgpu_gem_prime_export(struct drm_device *dev,
struct drm_gem_object *gobj,
int flags)
@@ -178,5 +223,27 @@ 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;
+ buf->ops = &amdgpu_dmabuf_ops;
+
return buf;
}
+
+struct drm_gem_object *amdgpu_gem_prime_import(struct drm_device *dev,
+ struct dma_buf *dma_buf)
+{
+ struct drm_gem_object *obj;
+
+ if (dma_buf->ops == &amdgpu_dmabuf_ops) {
+ obj = dma_buf->priv;
+ if (obj->dev == dev) {
+ /*
+ * Importing dmabuf exported from out own gem increases
+ * refcount on gem itself instead of f_count of dmabuf.
+ */
+ drm_gem_object_get(obj);
+ return obj;
+ }
+ }
+
+ return drm_gem_prime_import(dev, dma_buf);
+}
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