1 files changed, 45 insertions, 36 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_bo_manager.c b/drivers/gpu/drm/ttm/ttm_bo_manager.c
index 7410c190c89..038e947d00f 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_manager.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_manager.c
@@ -1,6 +1,6 @@
 /**************************************************************************
  *
- * Copyright (c) 2007-2009 VMware, Inc., Palo Alto, CA., USA
+ * Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA
  * All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
@@ -31,20 +31,29 @@
 #include "ttm/ttm_module.h"
 #include "ttm/ttm_bo_driver.h"
 #include "ttm/ttm_placement.h"
-#include <linux/jiffies.h>
+#include "drm_mm.h"
 #include <linux/slab.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/file.h>
+#include <linux/spinlock.h>
 #include <linux/module.h>
 
+/**
+ * Currently we use a spinlock for the lock, but a mutex *may* be
+ * more appropriate to reduce scheduling latency if the range manager
+ * ends up with very fragmented allocation patterns.
+ */
+
+struct ttm_range_manager {
+        struct drm_mm mm;
+        spinlock_t lock;
+};
+
 static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
                                struct ttm_buffer_object *bo,
                                struct ttm_placement *placement,
                                struct ttm_mem_reg *mem)
 {
-        struct ttm_bo_global *glob = man->bdev->glob;
-        struct drm_mm *mm = man->priv;
+        struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
+        struct drm_mm *mm = &rman->mm;
         struct drm_mm_node *node = NULL;
         unsigned long lpfn;
         int ret;
@@ -57,19 +66,19 @@ static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
                 if (unlikely(ret))
                         return ret;
 
-                spin_lock(&glob->lru_lock);
+                spin_lock(&rman->lock);
                 node = drm_mm_search_free_in_range(mm,
                                         mem->num_pages, mem->page_alignment,
                                         placement->fpfn, lpfn, 1);
                 if (unlikely(node == NULL)) {
-                        spin_unlock(&glob->lru_lock);
+                        spin_unlock(&rman->lock);
                         return 0;
                 }
                 node = drm_mm_get_block_atomic_range(node, mem->num_pages,
-                                                        mem->page_alignment,
-                                                        placement->fpfn,
-                                                        lpfn);
-                spin_unlock(&glob->lru_lock);
+                                                     mem->page_alignment,
+                                                     placement->fpfn,
+                                                     lpfn);
+                spin_unlock(&rman->lock);
         } while (node == NULL);
 
         mem->mm_node = node;
@@ -80,12 +89,12 @@ static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
 static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
                                 struct ttm_mem_reg *mem)
 {
-        struct ttm_bo_global *glob = man->bdev->glob;
+        struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
 
         if (mem->mm_node) {
-                spin_lock(&glob->lru_lock);
+                spin_lock(&rman->lock);
                 drm_mm_put_block(mem->mm_node);
-                spin_unlock(&glob->lru_lock);
+                spin_unlock(&rman->lock);
                 mem->mm_node = NULL;
         }
 }
@@ -93,49 +102,49 @@ static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
 static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
                            unsigned long p_size)
 {
-        struct drm_mm *mm;
+        struct ttm_range_manager *rman;
         int ret;
 
-        mm = kzalloc(sizeof(*mm), GFP_KERNEL);
-        if (!mm)
+        rman = kzalloc(sizeof(*rman), GFP_KERNEL);
+        if (!rman)
                 return -ENOMEM;
 
-        ret = drm_mm_init(mm, 0, p_size);
+        ret = drm_mm_init(&rman->mm, 0, p_size);
         if (ret) {
-                kfree(mm);
+                kfree(rman);
                 return ret;
         }
 
-        man->priv = mm;
+        spin_lock_init(&rman->lock);
+        man->priv = rman;
         return 0;
 }
 
 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
 {
-        struct ttm_bo_global *glob = man->bdev->glob;
-        struct drm_mm *mm = man->priv;
-        int ret = 0;
+        struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
+        struct drm_mm *mm = &rman->mm;
 
-        spin_lock(&glob->lru_lock);
+        spin_lock(&rman->lock);
         if (drm_mm_clean(mm)) {
                 drm_mm_takedown(mm);
-                kfree(mm);
+                spin_unlock(&rman->lock);
+                kfree(rman);
                 man->priv = NULL;
-        } else
-                ret = -EBUSY;
-        spin_unlock(&glob->lru_lock);
-        return ret;
+                return 0;
+        }
+        spin_unlock(&rman->lock);
+        return -EBUSY;
 }
 
 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
                              const char *prefix)
 {
-        struct ttm_bo_global *glob = man->bdev->glob;
-        struct drm_mm *mm = man->priv;
+        struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
 
-        spin_lock(&glob->lru_lock);
-        drm_mm_debug_table(mm, prefix);
-        spin_unlock(&glob->lru_lock);
+        spin_lock(&rman->lock);
+        drm_mm_debug_table(&rman->mm, prefix);
+        spin_unlock(&rman->lock);
 }
 
 const struct ttm_mem_type_manager_func ttm_bo_manager_func = {