/**
* drm_gem_mmap - memory map routine for GEM objects
* @filp: DRM file pointer
* @vma: VMA for the area to be mapped
*
* If a driver supports GEM object mapping, mmap calls on the DRM file
* descriptor will end up here.
*
* Look up the GEM object based on the offset passed in (vma->vm_pgoff will
* contain the fake offset we created when the GTT map ioctl was called on
* the object) and map it with a call to drm_gem_mmap_obj().
*
* If the caller is not granted access to the buffer object, the mmap will fail
* with EACCES. Please see the vma manager for more information.
*/
int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct drm_file *priv = filp->private_data;
struct drm_device *dev = priv->minor->dev;
struct drm_gem_mm *mm = dev->mm_private;
struct drm_gem_object *obj;
struct drm_vma_offset_node *node;
int ret = 0;
if (drm_device_is_unplugged(dev))
return -ENODEV;
mutex_lock(&dev->struct_mutex);
node = drm_vma_offset_exact_lookup(&mm->vma_manager, vma->vm_pgoff,
vma_pages(vma));
if (!node) {
mutex_unlock(&dev->struct_mutex);
return drm_mmap(filp, vma);
} else if (!drm_vma_node_is_allowed(node, filp)) {
mutex_unlock(&dev->struct_mutex);
return -EACCES;
}
obj = container_of(node, struct drm_gem_object, vma_node);
ret = drm_gem_mmap_obj(obj, drm_vma_node_size(node) << PAGE_SHIFT, vma);
mutex_unlock(&dev->struct_mutex);
return ret;
}
/* drm driver mmap file operations */
int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct drm_file *priv = filp->private_data;
struct drm_device *dev = priv->minor->dev;
struct drm_gem_object *obj;
struct drm_vma_offset_node *node;
int ret;
if (drm_device_is_unplugged(dev))
return -ENODEV;
mutex_lock(&dev->struct_mutex);
node = drm_vma_offset_exact_lookup(dev->vma_offset_manager,
vma->vm_pgoff,
vma_pages(vma));
if (!node) {
mutex_unlock(&dev->struct_mutex);
DRM_ERROR("failed to find vma node.\n");
return -EINVAL;
} else if (!drm_vma_node_is_allowed(node, filp)) {
mutex_unlock(&dev->struct_mutex);
return -EACCES;
}
obj = container_of(node, struct drm_gem_object, vma_node);
ret = rockchip_gem_mmap_buf(obj, vma);
mutex_unlock(&dev->struct_mutex);
return ret;
}
/**
* drm_gem_mmap - memory map routine for GEM objects
* @filp: DRM file pointer
* @vma: VMA for the area to be mapped
*
* If a driver supports GEM object mapping, mmap calls on the DRM file
* descriptor will end up here.
*
* Look up the GEM object based on the offset passed in (vma->vm_pgoff will
* contain the fake offset we created when the GTT map ioctl was called on
* the object) and map it with a call to drm_gem_mmap_obj().
*
* If the caller is not granted access to the buffer object, the mmap will fail
* with EACCES. Please see the vma manager for more information.
*/
int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct drm_file *priv = filp->private_data;
struct drm_device *dev = priv->minor->dev;
struct drm_gem_object *obj = NULL;
struct drm_vma_offset_node *node;
int ret;
if (drm_device_is_unplugged(dev))
return -ENODEV;
drm_vma_offset_lock_lookup(dev->vma_offset_manager);
node = drm_vma_offset_exact_lookup_locked(dev->vma_offset_manager,
vma->vm_pgoff,
vma_pages(vma));
if (likely(node)) {
obj = container_of(node, struct drm_gem_object, vma_node);
/*
* When the object is being freed, after it hits 0-refcnt it
* proceeds to tear down the object. In the process it will
* attempt to remove the VMA offset and so acquire this
* mgr->vm_lock. Therefore if we find an object with a 0-refcnt
* that matches our range, we know it is in the process of being
* destroyed and will be freed as soon as we release the lock -
* so we have to check for the 0-refcnted object and treat it as
* invalid.
*/
if (!kref_get_unless_zero(&obj->refcount))
obj = NULL;
}
drm_vma_offset_unlock_lookup(dev->vma_offset_manager);
if (!obj)
return -EINVAL;
if (!drm_vma_node_is_allowed(node, filp)) {
drm_gem_object_unreference_unlocked(obj);
return -EACCES;
}
ret = drm_gem_mmap_obj(obj, drm_vma_node_size(node) << PAGE_SHIFT,
vma);
drm_gem_object_unreference_unlocked(obj);
return ret;
}
int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct drm_file *file_priv = filp->private_data;
struct drm_device *dev = file_priv->minor->dev;
struct drm_gem_object *obj;
struct drm_vma_offset_node *node;
int ret;
if (drm_device_is_unplugged(dev))
return -ENODEV;
mutex_lock(&dev->struct_mutex);
node = drm_vma_offset_exact_lookup(dev->vma_offset_manager,
vma->vm_pgoff,
vma_pages(vma));
if (!node) {
mutex_unlock(&dev->struct_mutex);
DRM_ERROR("failed to find vma node.\n");
return -EINVAL;
} else if (!drm_vma_node_is_allowed(node, filp)) {
mutex_unlock(&dev->struct_mutex);
return -EACCES;
}
/*
* Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
* whole buffer from the start.
*/
vma->vm_pgoff = 0;
obj = container_of(node, struct drm_gem_object, vma_node);
ret = mtk_drm_gem_mmap_buf(obj, vma);
mutex_unlock(&dev->struct_mutex);
return ret;
}
