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/**************************************************************************
*
* 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
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* 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
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/*
* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
*/
#include "vmwgfx_drv.h"
#include <drm/ttm/ttm_module.h>
#include <drm/ttm/ttm_bo_driver.h>
#include <drm/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
};
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