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drm/ttm: Use private locks for the default bo range manager

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Searching for a free block in the range manager may in some situations be a
lenghty operation, and we want to avoid holding the global lru lock
during that time. Instead use a per-manager spinlock.

This leaves the global lru lock for quick lru list and swap list manipulation
only, including list manipulation associated with reserving buffer objects.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Thomas Hellstrom 2010-10-29 10:46:45 +02:00 committed by Dave Airlie
parent 3205bc242b
commit d7a67cb162
1 changed files with 45 additions and 36 deletions
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81
drivers/gpu/drm/ttm/ttm_bo_manager.c
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@ -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 = {