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Subject[PATCH v2 4/4] drm/virtio: move virtio_gpu_mem_entry initialization to new function
Date
Introduce new virtio_gpu_object_shmem_init() helper function which will
create the virtio_gpu_mem_entry array, containing the backing storage
information for the host. For the most path this just moves code from
virtio_gpu_object_attach().

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
drivers/gpu/drm/virtio/virtgpu_drv.h | 4 +-
drivers/gpu/drm/virtio/virtgpu_object.c | 55 ++++++++++++++++++++++++-
drivers/gpu/drm/virtio/virtgpu_vq.c | 51 ++---------------------
3 files changed, 60 insertions(+), 50 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index d37ddd7644f6..6c78c77a2afc 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -71,6 +71,7 @@ struct virtio_gpu_object {

struct sg_table *pages;
uint32_t mapped;
+
bool dumb;
bool created;
};
@@ -280,7 +281,8 @@ void virtio_gpu_cmd_set_scanout(struct virtio_gpu_device *vgdev,
uint32_t x, uint32_t y);
int virtio_gpu_object_attach(struct virtio_gpu_device *vgdev,
struct virtio_gpu_object *obj,
- struct virtio_gpu_fence *fence);
+ struct virtio_gpu_mem_entry *ents,
+ unsigned int nents);
int virtio_gpu_attach_status_page(struct virtio_gpu_device *vgdev);
int virtio_gpu_detach_status_page(struct virtio_gpu_device *vgdev);
void virtio_gpu_cursor_ping(struct virtio_gpu_device *vgdev,
diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c
index bce2b3d843fe..8870ee23ff2b 100644
--- a/drivers/gpu/drm/virtio/virtgpu_object.c
+++ b/drivers/gpu/drm/virtio/virtgpu_object.c
@@ -121,6 +121,51 @@ struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
return &bo->base.base;
}

+static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,
+ struct virtio_gpu_object *bo,
+ struct virtio_gpu_mem_entry **ents,
+ unsigned int *nents)
+{
+ bool use_dma_api = !virtio_has_iommu_quirk(vgdev->vdev);
+ struct scatterlist *sg;
+ int si, ret;
+
+ ret = drm_gem_shmem_pin(&bo->base.base);
+ if (ret < 0)
+ return -EINVAL;
+
+ bo->pages = drm_gem_shmem_get_sg_table(&bo->base.base);
+ if (!bo->pages) {
+ drm_gem_shmem_unpin(&bo->base.base);
+ return -EINVAL;
+ }
+
+ if (use_dma_api) {
+ bo->mapped = dma_map_sg(vgdev->vdev->dev.parent,
+ bo->pages->sgl, bo->pages->nents,
+ DMA_TO_DEVICE);
+ *nents = bo->mapped;
+ } else {
+ *nents = bo->pages->nents;
+ }
+
+ *ents = kmalloc_array(*nents, sizeof(struct virtio_gpu_mem_entry),
+ GFP_KERNEL);
+ if (!(*ents)) {
+ DRM_ERROR("failed to allocate ent list\n");
+ return -ENOMEM;
+ }
+
+ for_each_sg(bo->pages->sgl, sg, *nents, si) {
+ (*ents)[si].addr = cpu_to_le64(use_dma_api
+ ? sg_dma_address(sg)
+ : sg_phys(sg));
+ (*ents)[si].length = cpu_to_le32(sg->length);
+ (*ents)[si].padding = 0;
+ }
+ return 0;
+}
+
int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
struct virtio_gpu_object_params *params,
struct virtio_gpu_object **bo_ptr,
@@ -129,6 +174,8 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
struct virtio_gpu_object_array *objs = NULL;
struct drm_gem_shmem_object *shmem_obj;
struct virtio_gpu_object *bo;
+ struct virtio_gpu_mem_entry *ents;
+ unsigned int nents;
int ret;

*bo_ptr = NULL;
@@ -165,7 +212,13 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
objs, fence);
}

- ret = virtio_gpu_object_attach(vgdev, bo, NULL);
+ ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);
+ if (ret != 0) {
+ virtio_gpu_free_object(&shmem_obj->base);
+ return ret;
+ }
+
+ ret = virtio_gpu_object_attach(vgdev, bo, ents, nents);
if (ret != 0) {
virtio_gpu_free_object(&shmem_obj->base);
return ret;
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
index 87c439156151..8360f7338209 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -1086,56 +1086,11 @@ void virtio_gpu_cmd_submit(struct virtio_gpu_device *vgdev,

int virtio_gpu_object_attach(struct virtio_gpu_device *vgdev,
struct virtio_gpu_object *obj,
- struct virtio_gpu_fence *fence)
+ struct virtio_gpu_mem_entry *ents,
+ unsigned int nents)
{
- bool use_dma_api = !virtio_has_iommu_quirk(vgdev->vdev);
- struct virtio_gpu_mem_entry *ents;
- struct scatterlist *sg;
- int si, nents, ret;
-
- if (WARN_ON_ONCE(!obj->created))
- return -EINVAL;
- if (WARN_ON_ONCE(obj->pages))
- return -EINVAL;
-
- ret = drm_gem_shmem_pin(&obj->base.base);
- if (ret < 0)
- return -EINVAL;
-
- obj->pages = drm_gem_shmem_get_sg_table(&obj->base.base);
- if (obj->pages == NULL) {
- drm_gem_shmem_unpin(&obj->base.base);
- return -EINVAL;
- }
-
- if (use_dma_api) {
- obj->mapped = dma_map_sg(vgdev->vdev->dev.parent,
- obj->pages->sgl, obj->pages->nents,
- DMA_TO_DEVICE);
- nents = obj->mapped;
- } else {
- nents = obj->pages->nents;
- }
-
- /* gets freed when the ring has consumed it */
- ents = kmalloc_array(nents, sizeof(struct virtio_gpu_mem_entry),
- GFP_KERNEL);
- if (!ents) {
- DRM_ERROR("failed to allocate ent list\n");
- return -ENOMEM;
- }
-
- for_each_sg(obj->pages->sgl, sg, nents, si) {
- ents[si].addr = cpu_to_le64(use_dma_api
- ? sg_dma_address(sg)
- : sg_phys(sg));
- ents[si].length = cpu_to_le32(sg->length);
- ents[si].padding = 0;
- }
-
virtio_gpu_cmd_resource_attach_backing(vgdev, obj->hw_res_handle,
- ents, nents,
- fence);
+ ents, nents, NULL);
return 0;
}

--
2.18.1
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