drm/via: track user->memblock mapping with idr

Massive indirection through a hashtable for a simple key->pointer
look-up actually just adds bloat.

v2: Drop the misleading comment noted by Chris Wilson.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/via/via_drv.h b/drivers/gpu/drm/via/via_drv.h
index 9cf87d9..108ea71 100644 (file)
--- a/drivers/gpu/drm/via/via_drv.h
+++ b/drivers/gpu/drm/via/via_drv.h
@@ -91,6 +91,8 @@ typedef struct drm_via_private {
        struct drm_sman sman;
        int vram_initialized;
        int agp_initialized;
+       /** Mapping of userspace keys to mm objects */
+       struct idr object_idr;
        unsigned long vram_offset;
        unsigned long agp_offset;
        drm_via_blitq_t blit_queues[VIA_NUM_BLIT_ENGINES];

diff --git a/drivers/gpu/drm/via/via_map.c b/drivers/gpu/drm/via/via_map.c
index 6cca9a7..b09f659 100644 (file)
--- a/drivers/gpu/drm/via/via_map.c
+++ b/drivers/gpu/drm/via/via_map.c
@@ -104,6 +104,7 @@ int via_driver_load(struct drm_device *dev, unsigned long chipset)
 
        dev_priv->chipset = chipset;
 
+       idr_init(&dev->object_name_idr);
        ret = drm_sman_init(&dev_priv->sman, 2, 12, 8);
        if (ret) {
                kfree(dev_priv);

diff --git a/drivers/gpu/drm/via/via_mm.c b/drivers/gpu/drm/via/via_mm.c
index e0110bc..e6f2b63 100644 (file)
--- a/drivers/gpu/drm/via/via_mm.c
+++ b/drivers/gpu/drm/via/via_mm.c
@@ -118,7 +118,7 @@ int via_mem_alloc(struct drm_device *dev, void *data,
                  struct drm_file *file)
 {
        drm_via_mem_t *mem = data;
-       int retval = 0;
+       int retval = 0, user_key;
        struct drm_memblock_item *item;
        drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
        struct via_file_private *file_priv = file->driver_priv;
@@ -139,23 +139,44 @@ int via_mem_alloc(struct drm_device *dev, void *data,
 
        tmpSize = (mem->size + VIA_MM_ALIGN_MASK) >> VIA_MM_ALIGN_SHIFT;
        item = drm_sman_alloc(&dev_priv->sman, mem->type, tmpSize, 0, 0);
+       if (!item) {
+               retval = -ENOMEM;
+               goto fail_alloc;
+       }
 
-       if (item) {
-               list_add(&item->owner_list, &file_priv->obj_list);
-               mem->offset = ((mem->type == VIA_MEM_VIDEO) ?
-                             dev_priv->vram_offset : dev_priv->agp_offset) +
-                   (item->mm->
-                    offset(item->mm, item->mm_info) << VIA_MM_ALIGN_SHIFT);
-               mem->index = item->user_hash.key;
-       } else {
-               mem->offset = 0;
-               mem->size = 0;
-               mem->index = 0;
-               DRM_DEBUG("Video memory allocation failed\n");
+again:
+       if (idr_pre_get(&dev_priv->object_idr, GFP_KERNEL) == 0) {
                retval = -ENOMEM;
+               goto fail_idr;
        }
+
+       retval = idr_get_new_above(&dev_priv->object_idr, item, 1, &user_key);
+       if (retval == -EAGAIN)
+               goto again;
+       if (retval)
+               goto fail_idr;
+
+       list_add(&item->owner_list, &file_priv->obj_list);
        mutex_unlock(&dev->struct_mutex);
 
+       mem->offset = ((mem->type == VIA_MEM_VIDEO) ?
+                     dev_priv->vram_offset : dev_priv->agp_offset) +
+           (item->mm->
+            offset(item->mm, item->mm_info) << VIA_MM_ALIGN_SHIFT);
+       mem->index = user_key;
+
+       return 0;
+
+fail_idr:
+       drm_sman_free(item);
+fail_alloc:
+       mutex_unlock(&dev->struct_mutex);
+
+       mem->offset = 0;
+       mem->size = 0;
+       mem->index = 0;
+       DRM_DEBUG("Video memory allocation failed\n");
+
        return retval;
 }
 
@@ -163,11 +184,20 @@ int via_mem_free(struct drm_device *dev, void *data, struct drm_file *file_priv)
 {
        drm_via_private_t *dev_priv = dev->dev_private;
        drm_via_mem_t *mem = data;
+       struct drm_memblock_item *obj;
        int ret;
 
        mutex_lock(&dev->struct_mutex);
-       ret = drm_sman_free_key(&dev_priv->sman, mem->index);
+       obj = idr_find(&dev_priv->object_idr, mem->index);
+       if (obj == NULL) {
+               mutex_unlock(&dev->struct_mutex);
+               return -EINVAL;
+       }
+
+       idr_remove(&dev_priv->object_idr, mem->index);
+       drm_sman_free(obj);
        mutex_unlock(&dev->struct_mutex);
+
        DRM_DEBUG("free = 0x%lx\n", mem->index);
 
        return ret;