[PATCH v2 v3.18-rc4 3/4] drm: msm: Allow exported dma-bufs to be mapped

Daniel Thompson
2014-11-12T11:38:46Z

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>
---
drivers/gpu/drm/msm/msm_drv.c | 1 +
drivers/gpu/drm/msm/msm_drv.h | 3 +++
drivers/gpu/drm/msm/msm_gem_prime.c | 13 +++++++++++++
3 files changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index b67ef5985125..5717d4ec1a2c 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -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,
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 67f9d0a2332c..1a7344066154 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -154,6 +154,8 @@ 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);
@@ -170,6 +172,7 @@ 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);
diff --git a/drivers/gpu/drm/msm/msm_gem_prime.c b/drivers/gpu/drm/msm/msm_gem_prime.c
index ad772fe36115..dd7a7ab603e2 100644
--- a/drivers/gpu/drm/msm/msm_gem_prime.c
+++ b/drivers/gpu/drm/msm/msm_gem_prime.c
@@ -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)
{
--
1.9.3