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drm/msm: Allow exported dma-bufs to be mapped 

Currently msm does not implement gem_prime_mmap. Without this it is not
possible to draw onto a dma-buf from userspace (making its very hard to
implement the Android rendering model).

Fixing this is just a matter of adding a little boilerplate.

Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Daniel Thompson 2014-11-12 11:38:14 +00:00 committed by Rob Clark
parent 067fef372c
commit 77a147e742
3 changed files with 17 additions and 0 deletions
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1
drivers/gpu/drm/msm/msm_drv.c
View File

@ -832,6 +832,7 @@ static struct drm_driver msm_driver = {
.gem_prime_import_sg_table = msm_gem_prime_import_sg_table,
.gem_prime_vmap = msm_gem_prime_vmap,
.gem_prime_vunmap = msm_gem_prime_vunmap,
.gem_prime_mmap = msm_gem_prime_mmap,
#ifdef CONFIG_DEBUG_FS
.debugfs_init = msm_debugfs_init,
.debugfs_cleanup = msm_debugfs_cleanup,

3
drivers/gpu/drm/msm/msm_drv.h
View File

@ -159,6 +159,8 @@ void msm_update_fence(struct drm_device *dev, uint32_t fence);
int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
struct drm_file *file);
int msm_gem_mmap_obj(struct drm_gem_object *obj,
struct vm_area_struct *vma);
int msm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
int msm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj);
@ -175,6 +177,7 @@ int msm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
struct sg_table *msm_gem_prime_get_sg_table(struct drm_gem_object *obj);
void *msm_gem_prime_vmap(struct drm_gem_object *obj);
void msm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
int msm_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);
struct drm_gem_object *msm_gem_prime_import_sg_table(struct drm_device *dev,
struct dma_buf_attachment *attach, struct sg_table *sg);
int msm_gem_prime_pin(struct drm_gem_object *obj);

13
drivers/gpu/drm/msm/msm_gem_prime.c
View File

@ -37,6 +37,19 @@ void msm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
/* TODO msm_gem_vunmap() */
}
int msm_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
{
int ret;
mutex_lock(&obj->dev->struct_mutex);
ret = drm_gem_mmap_obj(obj, obj->size, vma);
mutex_unlock(&obj->dev->struct_mutex);
if (ret < 0)
return ret;
return msm_gem_mmap_obj(vma->vm_private_data, vma);
}
struct drm_gem_object *msm_gem_prime_import_sg_table(struct drm_device *dev,
struct dma_buf_attachment *attach, struct sg_table *sg)
{