ttm: add prime sharing support to TTM (v2)
This adds the ability for ttm common code to take an SG table
and use it as the backing for a slave TTM object.
The drivers can then populate their GTT tables using the SG object.
v2: make sure to setup VM for sg bos as well.
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index 974c8f8..e15f2a8 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -124,11 +124,15 @@
*
* @ttm_bo_type_kernel: These buffers are like ttm_bo_type_device buffers,
* but they cannot be accessed from user-space. For kernel-only use.
+ *
+ * @ttm_bo_type_sg: Buffer made from dmabuf sg table shared with another
+ * driver.
*/
enum ttm_bo_type {
ttm_bo_type_device,
- ttm_bo_type_kernel
+ ttm_bo_type_kernel,
+ ttm_bo_type_sg
};
struct ttm_tt;
@@ -271,6 +275,8 @@
unsigned long offset;
uint32_t cur_placement;
+
+ struct sg_table *sg;
};
/**
@@ -503,6 +509,7 @@
bool interrubtible,
struct file *persistent_swap_storage,
size_t acc_size,
+ struct sg_table *sg,
void (*destroy) (struct ttm_buffer_object *));
/**
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index d43e892..a05f1b5 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -81,6 +81,7 @@
#define TTM_PAGE_FLAG_PERSISTENT_SWAP (1 << 5)
#define TTM_PAGE_FLAG_ZERO_ALLOC (1 << 6)
#define TTM_PAGE_FLAG_DMA32 (1 << 7)
+#define TTM_PAGE_FLAG_SG (1 << 8)
enum ttm_caching_state {
tt_uncached,
@@ -116,6 +117,7 @@
struct page **pages;
uint32_t page_flags;
unsigned long num_pages;
+ struct sg_table *sg; /* for SG objects via dma-buf */
struct ttm_bo_global *glob;
struct ttm_backend *be;
struct file *swap_storage;