[PATCH] [v3] drm: pre allocate node for create_block
Ben Widawsky
ben at bwidawsk.net
Thu Jul 4 13:14:41 PDT 2013
For an upcoming patch where we introduce the i915 VMA, it's ideal to
have the drm_mm_node as part of the VMA struct (ie. it's pre-allocated).
Part of the conversion to VMAs is to kill off obj->gtt_space. Doing this
will break a bunch of code, but amongst them are 2 callers of
drm_mm_create_block(), both related to stolen memory.
It also allows us to embed the drm_mm_node into the object currently
which provides a nice transition over to the new code.
v2: Reordered to do before ripping out obj->gtt_offset.
Some minor cleanups made available because of reordering.
v3: s/continue/break on failed stolen node allocation (David)
Set obj->gtt_space on failed node allocation (David)
Only unref stolen (fix double free) on failed create_stolen (David)
Free node, and NULL it in failed create_stolen (David)
Add back accidentally removed newline (David)
CC: <dri-devel at lists.freedesktop.org>
CC: David Herrmann <dh.herrmann at gmail.com>
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
drivers/gpu/drm/drm_mm.c | 16 +++++----------
drivers/gpu/drm/i915/i915_gem_gtt.c | 20 ++++++++++++++----
drivers/gpu/drm/i915/i915_gem_stolen.c | 37 +++++++++++++++++++++++++---------
include/drm/drm_mm.h | 9 +++++----
4 files changed, 53 insertions(+), 29 deletions(-)
diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index 07cf99c..9e8dfbc 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -147,12 +147,10 @@ static void drm_mm_insert_helper(struct drm_mm_node *hole_node,
}
}
-struct drm_mm_node *drm_mm_create_block(struct drm_mm *mm,
- unsigned long start,
- unsigned long size,
- bool atomic)
+int drm_mm_create_block(struct drm_mm *mm, struct drm_mm_node *node,
+ unsigned long start, unsigned long size)
{
- struct drm_mm_node *hole, *node;
+ struct drm_mm_node *hole;
unsigned long end = start + size;
unsigned long hole_start;
unsigned long hole_end;
@@ -161,10 +159,6 @@ struct drm_mm_node *drm_mm_create_block(struct drm_mm *mm,
if (hole_start > start || hole_end < end)
continue;
- node = drm_mm_kmalloc(mm, atomic);
- if (unlikely(node == NULL))
- return NULL;
-
node->start = start;
node->size = size;
node->mm = mm;
@@ -184,11 +178,11 @@ struct drm_mm_node *drm_mm_create_block(struct drm_mm *mm,
node->hole_follows = 1;
}
- return node;
+ return 0;
}
WARN(1, "no hole found for block 0x%lx + 0x%lx\n", start, size);
- return NULL;
+ return -ENOSPC;
}
EXPORT_SYMBOL(drm_mm_create_block);
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 66929ea..88180a5 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -629,14 +629,26 @@ void i915_gem_setup_global_gtt(struct drm_device *dev,
/* Mark any preallocated objects as occupied */
list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list) {
+ int ret;
DRM_DEBUG_KMS("reserving preallocated space: %x + %zx\n",
obj->gtt_offset, obj->base.size);
BUG_ON(obj->gtt_space != I915_GTT_RESERVED);
- obj->gtt_space = drm_mm_create_block(&dev_priv->mm.gtt_space,
- obj->gtt_offset,
- obj->base.size,
- false);
+ obj->gtt_space = kzalloc(sizeof(*obj->gtt_space), GFP_KERNEL);
+ if (!obj->gtt_space) {
+ DRM_ERROR("Failed to preserve object at offset %x\n",
+ obj->gtt_offset);
+ continue;
+ }
+ ret = drm_mm_create_block(&dev_priv->mm.gtt_space,
+ obj->gtt_space,
+ obj->gtt_offset,
+ obj->base.size);
+ if (ret) {
+ DRM_DEBUG_KMS("Reservation failed\n");
+ kfree(obj->gtt_space);
+ obj->gtt_space = NULL;
+ }
obj->has_global_gtt_mapping = 1;
}
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index 8e02344..fb19d00 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -330,6 +330,7 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_i915_gem_object *obj;
struct drm_mm_node *stolen;
+ int ret;
if (dev_priv->mm.stolen_base == 0)
return NULL;
@@ -344,11 +345,15 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
if (WARN_ON(size == 0))
return NULL;
- stolen = drm_mm_create_block(&dev_priv->mm.stolen,
- stolen_offset, size,
- false);
- if (stolen == NULL) {
+ stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
+ if (!stolen)
+ return NULL;
+
+ ret = drm_mm_create_block(&dev_priv->mm.stolen, stolen, stolen_offset,
+ size);
+ if (ret) {
DRM_DEBUG_KMS("failed to allocate stolen space\n");
+ kfree(stolen);
return NULL;
}
@@ -369,13 +374,18 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
* later.
*/
if (drm_mm_initialized(&dev_priv->mm.gtt_space)) {
- obj->gtt_space = drm_mm_create_block(&dev_priv->mm.gtt_space,
- gtt_offset, size,
- false);
- if (obj->gtt_space == NULL) {
+ obj->gtt_space = kzalloc(sizeof(*obj->gtt_space), GFP_KERNEL);
+ if (!obj->gtt_space) {
+ DRM_DEBUG_KMS("-ENOMEM stolen GTT space\n");
+ goto unref_out;
+ }
+
+ ret = drm_mm_create_block(&dev_priv->mm.gtt_space,
+ obj->gtt_space,
+ gtt_offset, size);
+ if (ret) {
DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
- drm_gem_object_unreference(&obj->base);
- return NULL;
+ goto free_out;
}
} else
obj->gtt_space = I915_GTT_RESERVED;
@@ -387,6 +397,13 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
list_add_tail(&obj->mm_list, &dev_priv->mm.inactive_list);
return obj;
+
+free_out:
+ kfree(obj->gtt_space);
+ obj->gtt_space = NULL;
+unref_out:
+ drm_gem_object_unreference(&obj->base);
+ return NULL;
}
void
diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h
index 88591ef..d8b56b7 100644
--- a/include/drm/drm_mm.h
+++ b/include/drm/drm_mm.h
@@ -138,10 +138,10 @@ static inline unsigned long drm_mm_hole_node_end(struct drm_mm_node *hole_node)
/*
* Basic range manager support (drm_mm.c)
*/
-extern struct drm_mm_node *drm_mm_create_block(struct drm_mm *mm,
- unsigned long start,
- unsigned long size,
- bool atomic);
+extern int drm_mm_create_block(struct drm_mm *mm,
+ struct drm_mm_node *node,
+ unsigned long start,
+ unsigned long size);
extern struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *node,
unsigned long size,
unsigned alignment,
@@ -155,6 +155,7 @@ extern struct drm_mm_node *drm_mm_get_block_range_generic(
unsigned long start,
unsigned long end,
int atomic);
+
static inline struct drm_mm_node *drm_mm_get_block(struct drm_mm_node *parent,
unsigned long size,
unsigned alignment)
--
1.8.3.2
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