[PATCH 2/6] drm: use drm_file to tag vm-bos

[David Herrmann <dh.herrmann@gmail.com>]

Rather than using "struct file*", use "struct drm_file*" as tag VM tag for
BOs. This will pave the way for "struct drm_file*" without any "struct
file*" back-pointer.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c |  3 ++-
 drivers/gpu/drm/ast/ast_ttm.c           |  3 ++-
 drivers/gpu/drm/bochs/bochs_mm.c        |  3 ++-
 drivers/gpu/drm/cirrus/cirrus_ttm.c     |  3 ++-
 drivers/gpu/drm/drm_gem.c               |  8 +++----
 drivers/gpu/drm/drm_vma_manager.c       | 40 ++++++++++++++++-----------------
 drivers/gpu/drm/mgag200/mgag200_ttm.c   |  3 ++-
 drivers/gpu/drm/nouveau/nouveau_bo.c    |  3 ++-
 drivers/gpu/drm/qxl/qxl_ttm.c           |  3 ++-
 drivers/gpu/drm/radeon/radeon_ttm.c     |  3 ++-
 include/drm/drm_vma_manager.h           | 20 +++++++++--------
 11 files changed, 51 insertions(+), 41 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 9b61c8b..d975346 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -225,7 +225,8 @@ static int amdgpu_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 
 	if (amdgpu_ttm_tt_get_usermm(bo->ttm))
 		return -EPERM;
-	return drm_vma_node_verify_access(&rbo->gem_base.vma_node, filp);
+	return drm_vma_node_verify_access(&rbo->gem_base.vma_node,
+					  filp->private_data);
 }
 
 static void amdgpu_move_null(struct ttm_buffer_object *bo,
diff --git a/drivers/gpu/drm/ast/ast_ttm.c b/drivers/gpu/drm/ast/ast_ttm.c
index b29a412..608df4c 100644
--- a/drivers/gpu/drm/ast/ast_ttm.c
+++ b/drivers/gpu/drm/ast/ast_ttm.c
@@ -150,7 +150,8 @@ static int ast_bo_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 {
 	struct ast_bo *astbo = ast_bo(bo);
 
-	return drm_vma_node_verify_access(&astbo->gem.vma_node, filp);
+	return drm_vma_node_verify_access(&astbo->gem.vma_node,
+					  filp->private_data);
 }
 
 static int ast_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
diff --git a/drivers/gpu/drm/bochs/bochs_mm.c b/drivers/gpu/drm/bochs/bochs_mm.c
index 5c5638a..269cfca 100644
--- a/drivers/gpu/drm/bochs/bochs_mm.c
+++ b/drivers/gpu/drm/bochs/bochs_mm.c
@@ -128,7 +128,8 @@ static int bochs_bo_verify_access(struct ttm_buffer_object *bo,
 {
 	struct bochs_bo *bochsbo = bochs_bo(bo);
 
-	return drm_vma_node_verify_access(&bochsbo->gem.vma_node, filp);
+	return drm_vma_node_verify_access(&bochsbo->gem.vma_node,
+					  filp->private_data);
 }
 
 static int bochs_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
diff --git a/drivers/gpu/drm/cirrus/cirrus_ttm.c b/drivers/gpu/drm/cirrus/cirrus_ttm.c
index 1cc9ee6..bb2438d 100644
--- a/drivers/gpu/drm/cirrus/cirrus_ttm.c
+++ b/drivers/gpu/drm/cirrus/cirrus_ttm.c
@@ -150,7 +150,8 @@ static int cirrus_bo_verify_access(struct ttm_buffer_object *bo, struct file *fi
 {
 	struct cirrus_bo *cirrusbo = cirrus_bo(bo);
 
-	return drm_vma_node_verify_access(&cirrusbo->gem.vma_node, filp);
+	return drm_vma_node_verify_access(&cirrusbo->gem.vma_node,
+					  filp->private_data);
 }
 
 static int cirrus_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 9134ae1..465bacd 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -257,7 +257,7 @@ drm_gem_object_release_handle(int id, void *ptr, void *data)
 
 	if (drm_core_check_feature(dev, DRIVER_PRIME))
 		drm_gem_remove_prime_handles(obj, file_priv);
-	drm_vma_node_revoke(&obj->vma_node, file_priv->filp);
+	drm_vma_node_revoke(&obj->vma_node, file_priv);
 
 	if (dev->driver->gem_close_object)
 		dev->driver->gem_close_object(obj, file_priv);
@@ -372,7 +372,7 @@ drm_gem_handle_create_tail(struct drm_file *file_priv,
 
 	handle = ret;
 
-	ret = drm_vma_node_allow(&obj->vma_node, file_priv->filp);
+	ret = drm_vma_node_allow(&obj->vma_node, file_priv);
 	if (ret)
 		goto err_remove;
 
@@ -386,7 +386,7 @@ drm_gem_handle_create_tail(struct drm_file *file_priv,
 	return 0;
 
 err_revoke:
-	drm_vma_node_revoke(&obj->vma_node, file_priv->filp);
+	drm_vma_node_revoke(&obj->vma_node, file_priv);
 err_remove:
 	spin_lock(&file_priv->table_lock);
 	idr_remove(&file_priv->object_idr, handle);
@@ -991,7 +991,7 @@ int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 	if (!obj)
 		return -EINVAL;
 
-	if (!drm_vma_node_is_allowed(node, filp)) {
+	if (!drm_vma_node_is_allowed(node, priv)) {
 		drm_gem_object_unreference_unlocked(obj);
 		return -EACCES;
 	}
diff --git a/drivers/gpu/drm/drm_vma_manager.c b/drivers/gpu/drm/drm_vma_manager.c
index f306c88..a788a80 100644
--- a/drivers/gpu/drm/drm_vma_manager.c
+++ b/drivers/gpu/drm/drm_vma_manager.c
@@ -25,7 +25,6 @@
 #include <drm/drmP.h>
 #include <drm/drm_mm.h>
 #include <drm/drm_vma_manager.h>
-#include <linux/fs.h>
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/rbtree.h>
@@ -277,9 +276,9 @@ EXPORT_SYMBOL(drm_vma_offset_remove);
 /**
  * drm_vma_node_allow - Add open-file to list of allowed users
  * @node: Node to modify
- * @filp: Open file to add
+ * @tag: Tag of file to remove
  *
- * Add @filp to the list of allowed open-files for this node. If @filp is
+ * Add @tag to the list of allowed open-files for this node. If @tag is
  * already on this list, the ref-count is incremented.
  *
  * The list of allowed-users is preserved across drm_vma_offset_add() and
@@ -294,7 +293,7 @@ EXPORT_SYMBOL(drm_vma_offset_remove);
  * RETURNS:
  * 0 on success, negative error code on internal failure (out-of-mem)
  */
-int drm_vma_node_allow(struct drm_vma_offset_node *node, struct file *filp)
+int drm_vma_node_allow(struct drm_vma_offset_node *node, struct drm_file *tag)
 {
 	struct rb_node **iter;
 	struct rb_node *parent = NULL;
@@ -315,10 +314,10 @@ int drm_vma_node_allow(struct drm_vma_offset_node *node, struct file *filp)
 		parent = *iter;
 		entry = rb_entry(*iter, struct drm_vma_offset_file, vm_rb);
 
-		if (filp == entry->vm_filp) {
+		if (tag == entry->vm_tag) {
 			entry->vm_count++;
 			goto unlock;
-		} else if (filp > entry->vm_filp) {
+		} else if (tag > entry->vm_tag) {
 			iter = &(*iter)->rb_right;
 		} else {
 			iter = &(*iter)->rb_left;
@@ -330,7 +329,7 @@ int drm_vma_node_allow(struct drm_vma_offset_node *node, struct file *filp)
 		goto unlock;
 	}
 
-	new->vm_filp = filp;
+	new->vm_tag = tag;
 	new->vm_count = 1;
 	rb_link_node(&new->vm_rb, parent, iter);
 	rb_insert_color(&new->vm_rb, &node->vm_files);
@@ -346,17 +345,18 @@ EXPORT_SYMBOL(drm_vma_node_allow);
 /**
  * drm_vma_node_revoke - Remove open-file from list of allowed users
  * @node: Node to modify
- * @filp: Open file to remove
+ * @tag: Tag of file to remove
  *
- * Decrement the ref-count of @filp in the list of allowed open-files on @node.
- * If the ref-count drops to zero, remove @filp from the list. You must call
- * this once for every drm_vma_node_allow() on @filp.
+ * Decrement the ref-count of @tag in the list of allowed open-files on @node.
+ * If the ref-count drops to zero, remove @tag from the list. You must call
+ * this once for every drm_vma_node_allow() on @tag.
  *
  * This is locked against concurrent access internally.
  *
- * If @filp is not on the list, nothing is done.
+ * If @tag is not on the list, nothing is done.
  */
-void drm_vma_node_revoke(struct drm_vma_offset_node *node, struct file *filp)
+void drm_vma_node_revoke(struct drm_vma_offset_node *node,
+			 struct drm_file *tag)
 {
 	struct drm_vma_offset_file *entry;
 	struct rb_node *iter;
@@ -366,13 +366,13 @@ void drm_vma_node_revoke(struct drm_vma_offset_node *node, struct file *filp)
 	iter = node->vm_files.rb_node;
 	while (likely(iter)) {
 		entry = rb_entry(iter, struct drm_vma_offset_file, vm_rb);
-		if (filp == entry->vm_filp) {
+		if (tag == entry->vm_tag) {
 			if (!--entry->vm_count) {
 				rb_erase(&entry->vm_rb, &node->vm_files);
 				kfree(entry);
 			}
 			break;
-		} else if (filp > entry->vm_filp) {
+		} else if (tag > entry->vm_tag) {
 			iter = iter->rb_right;
 		} else {
 			iter = iter->rb_left;
@@ -386,9 +386,9 @@ EXPORT_SYMBOL(drm_vma_node_revoke);
 /**
  * drm_vma_node_is_allowed - Check whether an open-file is granted access
  * @node: Node to check
- * @filp: Open-file to check for
+ * @tag: Tag of file to remove
  *
- * Search the list in @node whether @filp is currently on the list of allowed
+ * Search the list in @node whether @tag is currently on the list of allowed
  * open-files (see drm_vma_node_allow()).
  *
  * This is locked against concurrent access internally.
@@ -397,7 +397,7 @@ EXPORT_SYMBOL(drm_vma_node_revoke);
  * true iff @filp is on the list
  */
 bool drm_vma_node_is_allowed(struct drm_vma_offset_node *node,
-			     struct file *filp)
+			     struct drm_file *tag)
 {
 	struct drm_vma_offset_file *entry;
 	struct rb_node *iter;
@@ -407,9 +407,9 @@ bool drm_vma_node_is_allowed(struct drm_vma_offset_node *node,
 	iter = node->vm_files.rb_node;
 	while (likely(iter)) {
 		entry = rb_entry(iter, struct drm_vma_offset_file, vm_rb);
-		if (filp == entry->vm_filp)
+		if (tag == entry->vm_tag)
 			break;
-		else if (filp > entry->vm_filp)
+		else if (tag > entry->vm_tag)
 			iter = iter->rb_right;
 		else
 			iter = iter->rb_left;
diff --git a/drivers/gpu/drm/mgag200/mgag200_ttm.c b/drivers/gpu/drm/mgag200/mgag200_ttm.c
index 68268e5..919b35f 100644
--- a/drivers/gpu/drm/mgag200/mgag200_ttm.c
+++ b/drivers/gpu/drm/mgag200/mgag200_ttm.c
@@ -150,7 +150,8 @@ static int mgag200_bo_verify_access(struct ttm_buffer_object *bo, struct file *f
 {
 	struct mgag200_bo *mgabo = mgag200_bo(bo);
 
-	return drm_vma_node_verify_access(&mgabo->gem.vma_node, filp);
+	return drm_vma_node_verify_access(&mgabo->gem.vma_node,
+					  filp->private_data);
 }
 
 static int mgag200_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 6190035..3a3e0b8 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -1315,7 +1315,8 @@ nouveau_bo_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 {
 	struct nouveau_bo *nvbo = nouveau_bo(bo);
 
-	return drm_vma_node_verify_access(&nvbo->gem.vma_node, filp);
+	return drm_vma_node_verify_access(&nvbo->gem.vma_node,
+					  filp->private_data);
 }
 
 static int
diff --git a/drivers/gpu/drm/qxl/qxl_ttm.c b/drivers/gpu/drm/qxl/qxl_ttm.c
index d50c967..3f6dee3 100644
--- a/drivers/gpu/drm/qxl/qxl_ttm.c
+++ b/drivers/gpu/drm/qxl/qxl_ttm.c
@@ -210,7 +210,8 @@ static int qxl_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 {
 	struct qxl_bo *qbo = to_qxl_bo(bo);
 
-	return drm_vma_node_verify_access(&qbo->gem_base.vma_node, filp);
+	return drm_vma_node_verify_access(&qbo->gem_base.vma_node,
+					  filp->private_data);
 }
 
 static int qxl_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index 0c00e19..b4341fa 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -237,7 +237,8 @@ static int radeon_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 
 	if (radeon_ttm_tt_has_userptr(bo->ttm))
 		return -EPERM;
-	return drm_vma_node_verify_access(&rbo->gem_base.vma_node, filp);
+	return drm_vma_node_verify_access(&rbo->gem_base.vma_node,
+					  filp->private_data);
 }
 
 static void radeon_move_null(struct ttm_buffer_object *bo,
diff --git a/include/drm/drm_vma_manager.h b/include/drm/drm_vma_manager.h
index 06ea8e07..304cdaa 100644
--- a/include/drm/drm_vma_manager.h
+++ b/include/drm/drm_vma_manager.h
@@ -24,16 +24,17 @@
  */
 
 #include <drm/drm_mm.h>
-#include <linux/fs.h>
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/rbtree.h>
 #include <linux/spinlock.h>
 #include <linux/types.h>
 
+struct drm_file;
+
 struct drm_vma_offset_file {
 	struct rb_node vm_rb;
-	struct file *vm_filp;
+	struct drm_file *vm_tag;
 	unsigned long vm_count;
 };
 
@@ -62,10 +63,11 @@ int drm_vma_offset_add(struct drm_vma_offset_manager *mgr,
 void drm_vma_offset_remove(struct drm_vma_offset_manager *mgr,
 			   struct drm_vma_offset_node *node);
 
-int drm_vma_node_allow(struct drm_vma_offset_node *node, struct file *filp);
-void drm_vma_node_revoke(struct drm_vma_offset_node *node, struct file *filp);
+int drm_vma_node_allow(struct drm_vma_offset_node *node, struct drm_file *tag);
+void drm_vma_node_revoke(struct drm_vma_offset_node *node,
+			 struct drm_file *tag);
 bool drm_vma_node_is_allowed(struct drm_vma_offset_node *node,
-			     struct file *filp);
+			     struct drm_file *tag);
 
 /**
  * drm_vma_offset_exact_lookup_locked() - Look up node by exact address
@@ -216,9 +218,9 @@ static inline void drm_vma_node_unmap(struct drm_vma_offset_node *node,
 /**
  * drm_vma_node_verify_access() - Access verification helper for TTM
  * @node: Offset node
- * @filp: Open-file
+ * @tag: Tag of file to check
  *
- * This checks whether @filp is granted access to @node. It is the same as
+ * This checks whether @tag is granted access to @node. It is the same as
  * drm_vma_node_is_allowed() but suitable as drop-in helper for TTM
  * verify_access() callbacks.
  *
@@ -226,9 +228,9 @@ static inline void drm_vma_node_unmap(struct drm_vma_offset_node *node,
  * 0 if access is granted, -EACCES otherwise.
  */
 static inline int drm_vma_node_verify_access(struct drm_vma_offset_node *node,
-					     struct file *filp)
+					     struct drm_file *tag)
 {
-	return drm_vma_node_is_allowed(node, filp) ? 0 : -EACCES;
+	return drm_vma_node_is_allowed(node, tag) ? 0 : -EACCES;
 }
 
 #endif /* __DRM_VMA_MANAGER_H__ */
-- 
2.9.3

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