Instead of relying on the DRM functions just implement our own import
functions. This adds support for taking care of unpinned DMA-buf.
v2: enable for all exporters, not just amdgpu, fix invalidation
handling, lock reservation object while setting callback
v3: change to new dma_buf attach interface
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c | 72 ++++++++++++++++++++++++++-----
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 32 +++++++++++---
2 files changed, 89 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c
index 7fef95f0fed1..fb43faf88eb0 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c
@@ -86,28 +86,24 @@ int amdgpu_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma
return ret;
}
-struct drm_gem_object *
-amdgpu_gem_prime_import_sg_table(struct drm_device *dev,
- struct dma_buf_attachment *attach,
- struct sg_table *sg)
+static struct drm_gem_object *
+amdgpu_gem_prime_create_obj(struct drm_device *dev, struct dma_buf *dma_buf)
{
- struct reservation_object *resv = attach->dmabuf->resv;
+ struct reservation_object *resv = dma_buf->resv;
struct amdgpu_device *adev = dev->dev_private;
struct amdgpu_bo *bo;
int ret;
ww_mutex_lock(&resv->lock, NULL);
- ret = amdgpu_bo_create(adev, attach->dmabuf->size, PAGE_SIZE,
+ ret = amdgpu_bo_create(adev, dma_buf->size, PAGE_SIZE,
AMDGPU_GEM_DOMAIN_CPU, 0, ttm_bo_type_sg,
resv, &bo);
if (ret)
goto error;
- bo->tbo.sg = sg;
- bo->tbo.ttm->sg = sg;
bo->allowed_domains = AMDGPU_GEM_DOMAIN_GTT;
bo->preferred_domains = AMDGPU_GEM_DOMAIN_GTT;
- if (attach->dmabuf->ops != &amdgpu_dmabuf_ops)
+ if (dma_buf->ops != &amdgpu_dmabuf_ops)
bo->prime_shared_count = 1;
ww_mutex_unlock(&resv->lock);
@@ -118,6 +114,26 @@ amdgpu_gem_prime_import_sg_table(struct drm_device *dev,
return ERR_PTR(ret);
}
+struct drm_gem_object *
+amdgpu_gem_prime_import_sg_table(struct drm_device *dev,
+ struct dma_buf_attachment *attach,
+ struct sg_table *sg)
+{
+ struct drm_gem_object *obj;
+ struct amdgpu_bo *bo;
+
+ obj = amdgpu_gem_prime_create_obj(dev, attach->dmabuf);
+ if (IS_ERR(obj))
+ return obj;
+
+ bo = gem_to_amdgpu_bo(obj);
+ amdgpu_bo_reserve(bo, true);
+ bo->tbo.sg = sg;
+ bo->tbo.ttm->sg = sg;
+ amdgpu_bo_unreserve(bo);
+ return obj;
+}
+
static struct sg_table *
amdgpu_gem_map_dma_buf(struct dma_buf_attachment *attach,
enum dma_data_direction dir)
@@ -293,9 +309,29 @@ struct dma_buf *amdgpu_gem_prime_export(struct drm_device *dev,
return buf;
}
+static void
+amdgpu_gem_prime_invalidate_mappings(struct dma_buf_attachment *attach)
+{
+ struct ttm_operation_ctx ctx = { false, false };
+ struct drm_gem_object *obj = attach->priv;
+ struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
+ struct ttm_placement placement = {};
+ int r;
+
+ r = ttm_bo_validate(&bo->tbo, &placement, &ctx);
+ if (r)
+ DRM_ERROR("Failed to unmap DMA-buf import (%d))\n", r);
+}
+
struct drm_gem_object *amdgpu_gem_prime_import(struct drm_device *dev,
struct dma_buf *dma_buf)
{
+ struct dma_buf_attach_info attach_info = {
+ .dev = dev->dev,
+ .dmabuf = dma_buf,
+ .invalidate = amdgpu_gem_prime_invalidate_mappings
+ };
+ struct dma_buf_attachment *attach;
struct drm_gem_object *obj;
if (dma_buf->ops == &amdgpu_dmabuf_ops) {
@@ -310,5 +346,21 @@ struct drm_gem_object *amdgpu_gem_prime_import(struct drm_device *dev,
}
}
- return drm_gem_prime_import(dev, dma_buf);
+ if (!dma_buf->invalidation_supported)
+ return drm_gem_prime_import(dev, dma_buf);
+
+ obj = amdgpu_gem_prime_create_obj(dev, dma_buf);
+ if (IS_ERR(obj))
+ return obj;
+
+ attach_info.priv = obj;
+ attach = dma_buf_attach(&attach_info);
+ if (IS_ERR(attach)) {
+ drm_gem_object_put(obj);
+ return ERR_CAST(attach);
+ }
+
+ get_dma_buf(dma_buf);
+ obj->import_attach = attach;
+ return obj;
}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index d2ab40494a4c..ad93f201e7b6 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -43,6 +43,7 @@
#include <linux/pagemap.h>
#include <linux/debugfs.h>
#include <linux/iommu.h>
+#include <linux/dma-buf.h>
#include "amdgpu.h"
#include "amdgpu_object.h"
#include "amdgpu_trace.h"
@@ -685,6 +686,7 @@ struct amdgpu_ttm_gup_task_list {
struct amdgpu_ttm_tt {
struct ttm_dma_tt ttm;
+ struct amdgpu_bo *bo;
u64 offset;
uint64_t userptr;
struct mm_struct *usermm;
@@ -993,6 +995,7 @@ static struct ttm_tt *amdgpu_ttm_tt_create(struct ttm_buffer_object *bo,
return NULL;
}
gtt->ttm.ttm.func = &amdgpu_backend_func;
+ gtt->bo = ttm_to_amdgpu_bo(bo);
if (ttm_sg_tt_init(>t->ttm, bo, page_flags)) {
kfree(gtt);
return NULL;
@@ -1005,7 +1008,6 @@ static int amdgpu_ttm_tt_populate(struct ttm_tt *ttm,
{
struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
struct amdgpu_ttm_tt *gtt = (void *)ttm;
- bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);
if (gtt && gtt->userptr) {
ttm->sg = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
@@ -1017,7 +1019,19 @@ static int amdgpu_ttm_tt_populate(struct ttm_tt *ttm,
return 0;
}
- if (slave && ttm->sg) {
+ if (ttm->page_flags & TTM_PAGE_FLAG_SG) {
+ if (!ttm->sg) {
+ struct dma_buf_attachment *attach;
+ struct sg_table *sgt;
+
+ attach = gtt->bo->gem_base.import_attach;
+ sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
+ if (IS_ERR(sgt))
+ return PTR_ERR(sgt);
+
+ ttm->sg = sgt;
+ }
+
drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
gtt->ttm.dma_address,
ttm->num_pages);
@@ -1036,9 +1050,8 @@ static int amdgpu_ttm_tt_populate(struct ttm_tt *ttm,
static void amdgpu_ttm_tt_unpopulate(struct ttm_tt *ttm)
{
- struct amdgpu_device *adev;
struct amdgpu_ttm_tt *gtt = (void *)ttm;
- bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);
+ struct amdgpu_device *adev;
if (gtt && gtt->userptr) {
amdgpu_ttm_tt_set_user_pages(ttm, NULL);
@@ -1047,7 +1060,16 @@ static void amdgpu_ttm_tt_unpopulate(struct ttm_tt *ttm)
return;
}
- if (slave)
+ if (ttm->sg && !gtt->bo->tbo.sg) {
+ struct dma_buf_attachment *attach;
+
+ attach = gtt->bo->gem_base.import_attach;
+ dma_buf_unmap_attachment(attach, ttm->sg, DMA_BIDIRECTIONAL);
+ ttm->sg = NULL;
+ return;
+ }
+
+ if (ttm->page_flags & TTM_PAGE_FLAG_SG)
return;
adev = amdgpu_ttm_adev(ttm->bdev);
--
2.14.1
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