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drm/amdgpu: add amdgpu_dma_buf_pin/unpin v2 

This implements the exporter side of unpinned DMA-buf handling.

v2: fix minor coding style issues

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/353999/?series=73646&rev=1
alistair/sensors
Christian König 2018-05-30 14:42:24 +02:00
parent 4993ba0263
commit 2d4dad2734
2 changed files with 51 additions and 7 deletions
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53
drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
View File

@ -222,6 +222,37 @@ static void amdgpu_dma_buf_detach(struct dma_buf *dmabuf,
bo->prime_shared_count--;
}
/**
* amdgpu_dma_buf_pin - &dma_buf_ops.pin implementation
*
* @attach: attachment to pin down
*
* Pin the BO which is backing the DMA-buf so that it can't move any more.
*/
static int amdgpu_dma_buf_pin(struct dma_buf_attachment *attach)
{
struct drm_gem_object *obj = attach->dmabuf->priv;
struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
/* pin buffer into GTT */
return amdgpu_bo_pin(bo, AMDGPU_GEM_DOMAIN_GTT);
}
/**
* amdgpu_dma_buf_unpin - &dma_buf_ops.unpin implementation
*
* @attach: attachment to unpin
*
* Unpin a previously pinned BO to make it movable again.
*/
static void amdgpu_dma_buf_unpin(struct dma_buf_attachment *attach)
{
struct drm_gem_object *obj = attach->dmabuf->priv;
struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
amdgpu_bo_unpin(bo);
}
/**
* amdgpu_dma_buf_map - &dma_buf_ops.map_dma_buf implementation
* @attach: DMA-buf attachment
@ -244,9 +275,19 @@ static struct sg_table *amdgpu_dma_buf_map(struct dma_buf_attachment *attach,
struct sg_table *sgt;
long r;
r = amdgpu_bo_pin(bo, AMDGPU_GEM_DOMAIN_GTT);
if (r)
return ERR_PTR(r);
if (!bo->pin_count) {
/* move buffer into GTT */
struct ttm_operation_ctx ctx = { false, false };
amdgpu_bo_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_GTT);
r = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
if (r)
return ERR_PTR(r);
} else if (!(amdgpu_mem_type_to_domain(bo->tbo.mem.mem_type) &
AMDGPU_GEM_DOMAIN_GTT)) {
return ERR_PTR(-EBUSY);
}
sgt = drm_prime_pages_to_sg(bo->tbo.ttm->pages, bo->tbo.num_pages);
if (IS_ERR(sgt))
@ -277,13 +318,9 @@ static void amdgpu_dma_buf_unmap(struct dma_buf_attachment *attach,
struct sg_table *sgt,
enum dma_data_direction dir)
{
struct drm_gem_object *obj = attach->dmabuf->priv;
struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
sg_free_table(sgt);
kfree(sgt);
amdgpu_bo_unpin(bo);
}
/**
@ -330,6 +367,8 @@ const struct dma_buf_ops amdgpu_dmabuf_ops = {
.dynamic_mapping = true,
.attach = amdgpu_dma_buf_attach,
.detach = amdgpu_dma_buf_detach,
.pin = amdgpu_dma_buf_pin,
.unpin = amdgpu_dma_buf_unpin,
.map_dma_buf = amdgpu_dma_buf_map,
.unmap_dma_buf = amdgpu_dma_buf_unmap,
.release = drm_gem_dmabuf_release,

5
drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
View File

@ -31,6 +31,7 @@
*/
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/dma-buf.h>
#include <drm/amdgpu_drm.h>
#include <drm/drm_cache.h>
@ -1274,6 +1275,10 @@ void amdgpu_bo_move_notify(struct ttm_buffer_object *bo,
amdgpu_bo_kunmap(abo);
if (abo->tbo.base.dma_buf && !abo->tbo.base.import_attach &&
bo->mem.mem_type != TTM_PL_SYSTEM)
dma_buf_move_notify(abo->tbo.base.dma_buf);
/* remember the eviction */
if (evict)
atomic64_inc(&adev->num_evictions);