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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>
wifi-calibration
Dave Airlie 2012-04-02 11:46:06 +01:00
parent 96503f592f
commit 129b78bfca
6 changed files with 28 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/nouveau/nouveau_bo.c
View File

@ -121,7 +121,7 @@ nouveau_bo_new(struct drm_device *dev, int size, int align,
ret = ttm_bo_init(&dev_priv->ttm.bdev, &nvbo->bo, size,
ttm_bo_type_device, &nvbo->placement,
align >> PAGE_SHIFT, 0, false, NULL, acc_size,
align >> PAGE_SHIFT, 0, false, NULL, acc_size, NULL,
nouveau_bo_del_ttm);
if (ret) {
/* ttm will call nouveau_bo_del_ttm if it fails.. */

2
drivers/gpu/drm/radeon/radeon_object.c
View File

@ -155,7 +155,7 @@ retry:
mutex_lock(&rdev->vram_mutex);
r = ttm_bo_init(&rdev->mman.bdev, &bo->tbo, size, type,
&bo->placement, page_align, 0, !kernel, NULL,
acc_size, &radeon_ttm_bo_destroy);
acc_size, NULL, &radeon_ttm_bo_destroy);
mutex_unlock(&rdev->vram_mutex);
if (unlikely(r != 0)) {
if (r != -ERESTARTSYS) {

17
drivers/gpu/drm/ttm/ttm_bo.c
View File

@ -343,6 +343,16 @@ static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
if (unlikely(bo->ttm == NULL))
ret = -ENOMEM;
break;
case ttm_bo_type_sg:
bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
page_flags | TTM_PAGE_FLAG_SG,
glob->dummy_read_page);
if (unlikely(bo->ttm == NULL)) {
ret = -ENOMEM;
break;
}
bo->ttm->sg = bo->sg;
break;
default:
pr_err("Illegal buffer object type\n");
ret = -EINVAL;
@ -1169,6 +1179,7 @@ int ttm_bo_init(struct ttm_bo_device *bdev,
bool interruptible,
struct file *persistent_swap_storage,
size_t acc_size,
struct sg_table *sg,
void (*destroy) (struct ttm_buffer_object *))
{
int ret = 0;
@ -1223,6 +1234,7 @@ int ttm_bo_init(struct ttm_bo_device *bdev,
bo->seq_valid = false;
bo->persistent_swap_storage = persistent_swap_storage;
bo->acc_size = acc_size;
bo->sg = sg;
atomic_inc(&bo->glob->bo_count);
ret = ttm_bo_check_placement(bo, placement);
@ -1233,7 +1245,8 @@ int ttm_bo_init(struct ttm_bo_device *bdev,
* For ttm_bo_type_device buffers, allocate
* address space from the device.
*/
if (bo->type == ttm_bo_type_device) {
if (bo->type == ttm_bo_type_device ||
bo->type == ttm_bo_type_sg) {
ret = ttm_bo_setup_vm(bo);
if (ret)
goto out_err;
@ -1312,7 +1325,7 @@ int ttm_bo_create(struct ttm_bo_device *bdev,
ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
buffer_start, interruptible,
persistent_swap_storage, acc_size, NULL);
persistent_swap_storage, acc_size, NULL, NULL);
if (likely(ret == 0))
*p_bo = bo;

2
drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
View File

@ -1567,7 +1567,7 @@ int vmw_dmabuf_init(struct vmw_private *dev_priv,
ret = ttm_bo_init(bdev, &vmw_bo->base, size,
ttm_bo_type_device, placement,
0, 0, interruptible,
NULL, acc_size, bo_free);
NULL, acc_size, NULL, bo_free);
return ret;
}

9
include/drm/ttm/ttm_bo_api.h
View File

@ -124,11 +124,15 @@ struct ttm_mem_reg {
*
* @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 @@ struct ttm_buffer_object {
unsigned long offset;
uint32_t cur_placement;
struct sg_table *sg;
};
/**
@ -503,6 +509,7 @@ extern int ttm_bo_init(struct ttm_bo_device *bdev,
bool interrubtible,
struct file *persistent_swap_storage,
size_t acc_size,
struct sg_table *sg,
void (*destroy) (struct ttm_buffer_object *));
/**

2
include/drm/ttm/ttm_bo_driver.h
View File

@ -81,6 +81,7 @@ struct ttm_backend_func {
#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 ttm_tt {
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;