[PATCH 4/7] ttm: add prime sharing support to TTM (v2)
Alex Deucher
alexdeucher at gmail.com
Tue May 22 14:09:10 PDT 2012
On Tue, May 22, 2012 at 8:50 AM, Dave Airlie <airlied at gmail.com> wrote:
> From: Dave Airlie <airlied at redhat.com>
>
> 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.
>
> Signed-off-by: Dave Airlie <airlied at redhat.com>
Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
> ---
> drivers/gpu/drm/nouveau/nouveau_bo.c | 2 +-
> drivers/gpu/drm/radeon/radeon_object.c | 2 +-
> drivers/gpu/drm/ttm/ttm_bo.c | 17 +++++++++++++++--
> drivers/gpu/drm/vmwgfx/vmwgfx_resource.c | 2 +-
> include/drm/ttm/ttm_bo_api.h | 9 ++++++++-
> include/drm/ttm/ttm_bo_driver.h | 2 ++
> 6 files changed, 28 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
> index 12ce044..81599d6 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_bo.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
> @@ -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.. */
> diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
> index df6a4db..1affbc9 100644
> --- a/drivers/gpu/drm/radeon/radeon_object.c
> +++ b/drivers/gpu/drm/radeon/radeon_object.c
> @@ -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) {
> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
> index 1f5c67c..36792bd 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
> @@ -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;
>
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
> index a37abb5..22bf9a2 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
> @@ -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;
> }
>
> 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 @@ 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 *));
>
> /**
> 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 @@ 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;
> --
> 1.7.6
>
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