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virtio: Rework virtio_gpu_object_kmap() 

Currently, virtio_gpu_object_kmap() is only called by
virtio_gpufb_create(), when a DRM framebuffer is created.

Thus, instead of returning the vmap'ed address, emit a warning
if virtio_gpu_object_kmap is called on an already mapped
object. With this change, kmap/kunmap calls are now balanced.

Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20180925161606.17980-3-ezequiel@collabora.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Ezequiel Garcia 2018-09-25 18:16:05 +02:00 committed by Gerd Hoffmann
parent 02c87cabd6
commit a20c4173c4
3 changed files with 6 additions and 17 deletions
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2
drivers/gpu/drm/virtio/virtgpu_drv.h
View File

@ -364,7 +364,7 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
unsigned long size, bool kernel, bool pinned,
struct virtio_gpu_object **bo_ptr);
void virtio_gpu_object_kunmap(struct virtio_gpu_object *bo);
int virtio_gpu_object_kmap(struct virtio_gpu_object *bo, void **ptr);
int virtio_gpu_object_kmap(struct virtio_gpu_object *bo);
int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
struct virtio_gpu_object *bo);
void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo);

10
drivers/gpu/drm/virtio/virtgpu_fb.c
View File

@ -203,12 +203,6 @@ static struct fb_ops virtio_gpufb_ops = {
.fb_imageblit = virtio_gpu_3d_imageblit,
};
static int virtio_gpu_vmap_fb(struct virtio_gpu_device *vgdev,
struct virtio_gpu_object *obj)
{
return virtio_gpu_object_kmap(obj, NULL);
}
static int virtio_gpufb_create(struct drm_fb_helper *helper,
struct drm_fb_helper_surface_size *sizes)
{
@ -241,9 +235,9 @@ static int virtio_gpufb_create(struct drm_fb_helper *helper,
virtio_gpu_cmd_create_resource(vgdev, resid, format,
mode_cmd.width, mode_cmd.height);
ret = virtio_gpu_vmap_fb(vgdev, obj);
ret = virtio_gpu_object_kmap(obj);
if (ret) {
DRM_ERROR("failed to vmap fb %d\n", ret);
DRM_ERROR("failed to kmap fb %d\n", ret);
goto err_obj_vmap;
}

11
drivers/gpu/drm/virtio/virtgpu_object.c
View File

@ -107,22 +107,17 @@ void virtio_gpu_object_kunmap(struct virtio_gpu_object *bo)
ttm_bo_kunmap(&bo->kmap);
}
int virtio_gpu_object_kmap(struct virtio_gpu_object *bo, void **ptr)
int virtio_gpu_object_kmap(struct virtio_gpu_object *bo)
{
bool is_iomem;
int r;
if (bo->vmap) {
if (ptr)
*ptr = bo->vmap;
return 0;
}
WARN_ON(bo->vmap);
r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
if (r)
return r;
bo->vmap = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
if (ptr)
*ptr = bo->vmap;
return 0;
}