drm/exynos: added cache attribute support for gem.
with this patch, user application can set cache attribute(such as
cachable, writecombime or non-cachable) of the memory region allocated
by gem framework.
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index 1dffa83..e8ab3be 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -66,6 +66,22 @@
return 0;
}
+static void update_vm_cache_attr(struct exynos_drm_gem_obj *obj,
+ struct vm_area_struct *vma)
+{
+ DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags);
+
+ /* non-cachable as default. */
+ if (obj->flags & EXYNOS_BO_CACHABLE)
+ vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+ else if (obj->flags & EXYNOS_BO_WC)
+ vma->vm_page_prot =
+ pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+ else
+ vma->vm_page_prot =
+ pgprot_noncached(vm_get_page_prot(vma->vm_flags));
+}
+
static unsigned long roundup_gem_size(unsigned long size, unsigned int flags)
{
if (!IS_NONCONTIG_BUFFER(flags)) {
@@ -262,24 +278,24 @@
void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
{
struct drm_gem_object *obj;
+ struct exynos_drm_gem_buf *buf;
DRM_DEBUG_KMS("%s\n", __FILE__);
- if (!exynos_gem_obj)
- return;
-
obj = &exynos_gem_obj->base;
+ buf = exynos_gem_obj->buffer;
DRM_DEBUG_KMS("handle count = %d\n", atomic_read(&obj->handle_count));
- if ((exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) &&
- exynos_gem_obj->buffer->pages)
+ if (!buf->pages)
+ return;
+
+ if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG)
exynos_drm_gem_put_pages(obj);
else
- exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags,
- exynos_gem_obj->buffer);
+ exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf);
- exynos_drm_fini_buf(obj->dev, exynos_gem_obj->buffer);
+ exynos_drm_fini_buf(obj->dev, buf);
exynos_gem_obj->buffer = NULL;
if (obj->map_list.map)
@@ -493,8 +509,7 @@
vma->vm_flags |= (VM_IO | VM_RESERVED);
- /* in case of direct mapping, always having non-cachable attribute */
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ update_vm_cache_attr(exynos_gem_obj, vma);
vm_size = usize = vma->vm_end - vma->vm_start;
@@ -724,6 +739,8 @@
int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
{
+ struct exynos_drm_gem_obj *exynos_gem_obj;
+ struct drm_gem_object *obj;
int ret;
DRM_DEBUG_KMS("%s\n", __FILE__);
@@ -735,8 +752,20 @@
return ret;
}
+ obj = vma->vm_private_data;
+ exynos_gem_obj = to_exynos_gem_obj(obj);
+
+ ret = check_gem_flags(exynos_gem_obj->flags);
+ if (ret) {
+ drm_gem_vm_close(vma);
+ drm_gem_free_mmap_offset(obj);
+ return ret;
+ }
+
vma->vm_flags &= ~VM_PFNMAP;
vma->vm_flags |= VM_MIXEDMAP;
+ update_vm_cache_attr(exynos_gem_obj, vma);
+
return ret;
}