drm: GEM mmap support
Add core support for mapping of GEM objects. Drivers should provide a
vm_operations_struct if they want to support page faulting of objects.
The code for handling GEM object offsets was taken from TTM, which was
written by Thomas Hellström.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index ccd1afd..b3939de 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -64,6 +64,13 @@
* up at a later date, and as our interface with shmfs for memory allocation.
*/
+/*
+ * We make up offsets for buffer objects so we can recognize them at
+ * mmap time.
+ */
+#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1)
+#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16)
+
/**
* Initialize the GEM device fields
*/
@@ -71,6 +78,8 @@
int
drm_gem_init(struct drm_device *dev)
{
+ struct drm_gem_mm *mm;
+
spin_lock_init(&dev->object_name_lock);
idr_init(&dev->object_name_idr);
atomic_set(&dev->object_count, 0);
@@ -79,9 +88,41 @@
atomic_set(&dev->pin_memory, 0);
atomic_set(&dev->gtt_count, 0);
atomic_set(&dev->gtt_memory, 0);
+
+ mm = drm_calloc(1, sizeof(struct drm_gem_mm), DRM_MEM_MM);
+ if (!mm) {
+ DRM_ERROR("out of memory\n");
+ return -ENOMEM;
+ }
+
+ dev->mm_private = mm;
+
+ if (drm_ht_create(&mm->offset_hash, 19)) {
+ drm_free(mm, sizeof(struct drm_gem_mm), DRM_MEM_MM);
+ return -ENOMEM;
+ }
+
+ if (drm_mm_init(&mm->offset_manager, DRM_FILE_PAGE_OFFSET_START,
+ DRM_FILE_PAGE_OFFSET_SIZE)) {
+ drm_free(mm, sizeof(struct drm_gem_mm), DRM_MEM_MM);
+ drm_ht_remove(&mm->offset_hash);
+ return -ENOMEM;
+ }
+
return 0;
}
+void
+drm_gem_destroy(struct drm_device *dev)
+{
+ struct drm_gem_mm *mm = dev->mm_private;
+
+ drm_mm_takedown(&mm->offset_manager);
+ drm_ht_remove(&mm->offset_hash);
+ drm_free(mm, sizeof(struct drm_gem_mm), DRM_MEM_MM);
+ dev->mm_private = NULL;
+}
+
/**
* Allocate a GEM object of the specified size with shmfs backing store
*/
@@ -419,3 +460,71 @@
}
EXPORT_SYMBOL(drm_gem_object_handle_free);
+/**
+ * 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.
+ *
+ * If we find the 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), we set up the driver fault handler so that any accesses
+ * to the object can be trapped, to perform migration, GTT binding, surface
+ * register allocation, or performance monitoring.
+ */
+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_map *map = NULL;
+ struct drm_gem_object *obj;
+ struct drm_hash_item *hash;
+ unsigned long prot;
+ int ret = 0;
+
+ mutex_lock(&dev->struct_mutex);
+
+ if (drm_ht_find_item(&mm->offset_hash, vma->vm_pgoff, &hash)) {
+ mutex_unlock(&dev->struct_mutex);
+ return drm_mmap(filp, vma);
+ }
+
+ map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
+ if (!map ||
+ ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) {
+ ret = -EPERM;
+ goto out_unlock;
+ }
+
+ /* Check for valid size. */
+ if (map->size < vma->vm_end - vma->vm_start) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ obj = map->handle;
+ if (!obj->dev->driver->gem_vm_ops) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ vma->vm_flags |= VM_RESERVED | VM_IO | VM_PFNMAP | VM_DONTEXPAND;
+ vma->vm_ops = obj->dev->driver->gem_vm_ops;
+ vma->vm_private_data = map->handle;
+ /* FIXME: use pgprot_writecombine when available */
+ prot = pgprot_val(vma->vm_page_prot);
+ prot |= _PAGE_CACHE_WC;
+ vma->vm_page_prot = __pgprot(prot);
+
+ vma->vm_file = filp; /* Needed for drm_vm_open() */
+ drm_vm_open_locked(vma);
+
+out_unlock:
+ mutex_unlock(&dev->struct_mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL(drm_gem_mmap);