linux/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c
Thomas Hellstrom fb17f18993 vmwgfx: Restrict number of GMR pages to device limit
When GMR2 is available, make sure we restrict the number of used GMR pages
to the limit indicated by the device.
This is done by failing a GMRID allocation if the total number of GMR pages
exceeds the limit.
As a result TTM will then start evicting buffers in GMR memory on a
LRU basis until the allocation succeeds.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2011-09-01 09:38:07 +01:00

162 lines
4.3 KiB
C

/**************************************************************************
*
* Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA
* All Rights Reserved.
*
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* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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/*
* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
*/
#include "vmwgfx_drv.h"
#include "ttm/ttm_module.h"
#include "ttm/ttm_bo_driver.h"
#include "ttm/ttm_placement.h"
#include <linux/idr.h>
#include <linux/spinlock.h>
#include <linux/kernel.h>
struct vmwgfx_gmrid_man {
spinlock_t lock;
struct ida gmr_ida;
uint32_t max_gmr_ids;
uint32_t max_gmr_pages;
uint32_t used_gmr_pages;
};
static int vmw_gmrid_man_get_node(struct ttm_mem_type_manager *man,
struct ttm_buffer_object *bo,
struct ttm_placement *placement,
struct ttm_mem_reg *mem)
{
struct vmwgfx_gmrid_man *gman =
(struct vmwgfx_gmrid_man *)man->priv;
int ret = 0;
int id;
mem->mm_node = NULL;
spin_lock(&gman->lock);
if (gman->max_gmr_pages > 0) {
gman->used_gmr_pages += bo->num_pages;
if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages))
goto out_err_locked;
}
do {
spin_unlock(&gman->lock);
if (unlikely(ida_pre_get(&gman->gmr_ida, GFP_KERNEL) == 0)) {
ret = -ENOMEM;
goto out_err;
}
spin_lock(&gman->lock);
ret = ida_get_new(&gman->gmr_ida, &id);
if (unlikely(ret == 0 && id >= gman->max_gmr_ids)) {
ida_remove(&gman->gmr_ida, id);
ret = 0;
goto out_err_locked;
}
} while (ret == -EAGAIN);
if (likely(ret == 0)) {
mem->mm_node = gman;
mem->start = id;
mem->num_pages = bo->num_pages;
} else
goto out_err_locked;
spin_unlock(&gman->lock);
return 0;
out_err:
spin_lock(&gman->lock);
out_err_locked:
gman->used_gmr_pages -= bo->num_pages;
spin_unlock(&gman->lock);
return ret;
}
static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man,
struct ttm_mem_reg *mem)
{
struct vmwgfx_gmrid_man *gman =
(struct vmwgfx_gmrid_man *)man->priv;
if (mem->mm_node) {
spin_lock(&gman->lock);
ida_remove(&gman->gmr_ida, mem->start);
gman->used_gmr_pages -= mem->num_pages;
spin_unlock(&gman->lock);
mem->mm_node = NULL;
}
}
static int vmw_gmrid_man_init(struct ttm_mem_type_manager *man,
unsigned long p_size)
{
struct vmw_private *dev_priv =
container_of(man->bdev, struct vmw_private, bdev);
struct vmwgfx_gmrid_man *gman =
kzalloc(sizeof(*gman), GFP_KERNEL);
if (unlikely(gman == NULL))
return -ENOMEM;
spin_lock_init(&gman->lock);
gman->max_gmr_pages = dev_priv->max_gmr_pages;
gman->used_gmr_pages = 0;
ida_init(&gman->gmr_ida);
gman->max_gmr_ids = p_size;
man->priv = (void *) gman;
return 0;
}
static int vmw_gmrid_man_takedown(struct ttm_mem_type_manager *man)
{
struct vmwgfx_gmrid_man *gman =
(struct vmwgfx_gmrid_man *)man->priv;
if (gman) {
ida_destroy(&gman->gmr_ida);
kfree(gman);
}
return 0;
}
static void vmw_gmrid_man_debug(struct ttm_mem_type_manager *man,
const char *prefix)
{
printk(KERN_INFO "%s: No debug info available for the GMR "
"id manager.\n", prefix);
}
const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = {
vmw_gmrid_man_init,
vmw_gmrid_man_takedown,
vmw_gmrid_man_get_node,
vmw_gmrid_man_put_node,
vmw_gmrid_man_debug
};