drm/gem: convert to new unified vma manager

Use the new vma manager instead of the old hashtable. Also convert all
drivers to use the new convenience helpers. This drops all the
(map_list.hash.key << PAGE_SHIFT) non-sense.

Locking and access-management is exactly the same as before with an
additional lock inside of the vma-manager, which strictly wouldn't be
needed for gem.

v2:
 - rebase on drm-next
 - init nodes via drm_vma_node_reset() in drm_gem.c
v3:
 - fix tegra
v4:
 - remove duplicate if (drm_vma_node_has_offset()) checks
 - inline now trivial drm_vma_node_offset_addr() calls
v5:
 - skip node-reset on gem-init due to kzalloc()
 - do not allow mapping gem-objects with offsets (backwards compat)
 - remove unneccessary casts

Cc: Inki Dae <inki.dae@samsung.com>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Acked-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@gmail.com>

1 files changed, 15 insertions, 74 deletions

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 1ad9e7ec0119..3613b50b5c26 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -37,6 +37,7 @@
 #include <linux/shmem_fs.h>
 #include <linux/dma-buf.h>
 #include <drm/drmP.h>
+#include <drm/drm_vma_manager.h>
 
 /** @file drm_gem.c
  *
@@ -102,14 +103,9 @@ drm_gem_init(struct drm_device *dev)
         }
 
         dev->mm_private = mm;
-
-        if (drm_ht_create(&mm->offset_hash, 12)) {
-                kfree(mm);
-                return -ENOMEM;
-        }
-
-        drm_mm_init(&mm->offset_manager, DRM_FILE_PAGE_OFFSET_START,
-                    DRM_FILE_PAGE_OFFSET_SIZE);
+        drm_vma_offset_manager_init(&mm->vma_manager,
+                                    DRM_FILE_PAGE_OFFSET_START,
+                                    DRM_FILE_PAGE_OFFSET_SIZE);
 
         return 0;
 }
@@ -119,8 +115,7 @@ 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_vma_offset_manager_destroy(&mm->vma_manager);
         kfree(mm);
         dev->mm_private = NULL;
 }
@@ -302,12 +297,8 @@ drm_gem_free_mmap_offset(struct drm_gem_object *obj)
 {
         struct drm_device *dev = obj->dev;
         struct drm_gem_mm *mm = dev->mm_private;
-        struct drm_map_list *list = &obj->map_list;
 
-        drm_ht_remove_item(&mm->offset_hash, &list->hash);
-        drm_mm_put_block(list->file_offset_node);
-        kfree(list->map);
-        list->map = NULL;
+        drm_vma_offset_remove(&mm->vma_manager, &obj->vma_node);
 }
 EXPORT_SYMBOL(drm_gem_free_mmap_offset);
 
@@ -327,54 +318,9 @@ drm_gem_create_mmap_offset(struct drm_gem_object *obj)
 {
         struct drm_device *dev = obj->dev;
         struct drm_gem_mm *mm = dev->mm_private;
-        struct drm_map_list *list;
-        struct drm_local_map *map;
-        int ret;
-
-        /* Set the object up for mmap'ing */
-        list = &obj->map_list;
-        list->map = kzalloc(sizeof(struct drm_map_list), GFP_KERNEL);
-        if (!list->map)
-                return -ENOMEM;
-
-        map = list->map;
-        map->type = _DRM_GEM;
-        map->size = obj->size;
-        map->handle = obj;
-
-        /* Get a DRM GEM mmap offset allocated... */
-        list->file_offset_node = drm_mm_search_free(&mm->offset_manager,
-                        obj->size / PAGE_SIZE, 0, false);
-
-        if (!list->file_offset_node) {
-                DRM_ERROR("failed to allocate offset for bo %d\n", obj->name);
-                ret = -ENOSPC;
-                goto out_free_list;
-        }
 
-        list->file_offset_node = drm_mm_get_block(list->file_offset_node,
-                        obj->size / PAGE_SIZE, 0);
-        if (!list->file_offset_node) {
-                ret = -ENOMEM;
-                goto out_free_list;
-        }
-
-        list->hash.key = list->file_offset_node->start;
-        ret = drm_ht_insert_item(&mm->offset_hash, &list->hash);
-        if (ret) {
-                DRM_ERROR("failed to add to map hash\n");
-                goto out_free_mm;
-        }
-
-        return 0;
-
-out_free_mm:
-        drm_mm_put_block(list->file_offset_node);
-out_free_list:
-        kfree(list->map);
-        list->map = NULL;
-
-        return ret;
+        return drm_vma_offset_add(&mm->vma_manager, &obj->vma_node,
+                                  obj->size / PAGE_SIZE);
 }
 EXPORT_SYMBOL(drm_gem_create_mmap_offset);
 
@@ -703,8 +649,8 @@ 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_local_map *map = NULL;
-        struct drm_hash_item *hash;
+        struct drm_gem_object *obj;
+        struct drm_vma_offset_node *node;
         int ret = 0;
 
         if (drm_device_is_unplugged(dev))
@@ -712,21 +658,16 @@ int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 
         mutex_lock(&dev->struct_mutex);
 
-        if (drm_ht_find_item(&mm->offset_hash, vma->vm_pgoff, &hash)) {
+        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);
         }
 
-        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;
-        }
-
-        ret = drm_gem_mmap_obj(map->handle, map->size, vma);
+        obj = container_of(node, struct drm_gem_object, vma_node);
+        ret = drm_gem_mmap_obj(obj, drm_vma_node_size(node), vma);
 
-out_unlock:
         mutex_unlock(&dev->struct_mutex);
 
         return ret;