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// SPDX-License-Identifier: GPL-2.0 OR MIT
/**************************************************************************
*
* Copyright 2007-2010 VMware, Inc., Palo Alto, CA., USA
*
* 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_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 {
struct ttm_resource_manager manager;
spinlock_t lock;
struct ida gmr_ida;
uint32_t max_gmr_ids;
uint32_t max_gmr_pages;
uint32_t used_gmr_pages;
};
static struct vmwgfx_gmrid_man *to_gmrid_manager(struct ttm_resource_manager *man)
{
return container_of(man, struct vmwgfx_gmrid_man, manager);
}
static int vmw_gmrid_man_get_node(struct ttm_resource_manager *man,
struct ttm_buffer_object *bo,
const struct ttm_place *place,
struct ttm_resource **res)
{
struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
int id;
*res = kmalloc(sizeof(**res), GFP_KERNEL);
if (!*res)
return -ENOMEM;
ttm_resource_init(bo, place, *res);
id = ida_alloc_max(&gman->gmr_ida, gman->max_gmr_ids - 1, GFP_KERNEL);
if (id < 0)
return id;
spin_lock(&gman->lock);
if (gman->max_gmr_pages > 0) {
gman->used_gmr_pages += (*res)->num_pages;
/*
* Because the graphics memory is a soft limit we can try to
* expand it instead of letting the userspace apps crash.
* We're just going to have a sane limit (half of RAM)
* on the number of MOB's that we create and will try to keep
* the system running until we reach that.
*/
if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages)) {
const unsigned long max_graphics_pages = totalram_pages() / 2;
uint32_t new_max_pages = 0;
DRM_WARN("vmwgfx: mob memory overflow. Consider increasing guest RAM and graphicsMemory.\n");
vmw_host_printf("vmwgfx, warning: mob memory overflow. Consider increasing guest RAM and graphicsMemory.\n");
if (gman->max_gmr_pages > (max_graphics_pages / 2)) {
DRM_WARN("vmwgfx: guest requires more than half of RAM for graphics.\n");
new_max_pages = max_graphics_pages;
} else
new_max_pages = gman->max_gmr_pages * 2;
if (new_max_pages > gman->max_gmr_pages && new_max_pages >= gman->used_gmr_pages) {
DRM_WARN("vmwgfx: increasing guest mob limits to %u kB.\n",
((new_max_pages) << (PAGE_SHIFT - 10)));
gman->max_gmr_pages = new_max_pages;
} else {
char buf[256];
snprintf(buf, sizeof(buf),
"vmwgfx, error: guest graphics is out of memory (mob limit at: %ukB).\n",
((gman->max_gmr_pages) << (PAGE_SHIFT - 10)));
vmw_host_printf(buf);
DRM_WARN("%s", buf);
goto nospace;
}
}
}
(*res)->start = id;
spin_unlock(&gman->lock);
return 0;
nospace:
gman->used_gmr_pages -= (*res)->num_pages;
spin_unlock(&gman->lock);
ida_free(&gman->gmr_ida, id);
kfree(*res);
return -ENOSPC;
}
static void vmw_gmrid_man_put_node(struct ttm_resource_manager *man,
struct ttm_resource *res)
{
struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
ida_free(&gman->gmr_ida, res->start);
spin_lock(&gman->lock);
gman->used_gmr_pages -= res->num_pages;
spin_unlock(&gman->lock);
kfree(res);
}
static const struct ttm_resource_manager_func vmw_gmrid_manager_func;
int vmw_gmrid_man_init(struct vmw_private *dev_priv, int type)
{
struct ttm_resource_manager *man;
struct vmwgfx_gmrid_man *gman =
kzalloc(sizeof(*gman), GFP_KERNEL);
if (unlikely(!gman))
return -ENOMEM;
man = &gman->manager;
man->func = &vmw_gmrid_manager_func;
/* TODO: This is most likely not correct */
man->use_tt = true;
ttm_resource_manager_init(man, 0);
spin_lock_init(&gman->lock);
gman->used_gmr_pages = 0;
ida_init(&gman->gmr_ida);
switch (type) {
case VMW_PL_GMR:
gman->max_gmr_ids = dev_priv->max_gmr_ids;
gman->max_gmr_pages = dev_priv->max_gmr_pages;
break;
case VMW_PL_MOB:
gman->max_gmr_ids = VMWGFX_NUM_MOB;
gman->max_gmr_pages = dev_priv->max_mob_pages;
break;
default:
BUG();
}
ttm_set_driver_manager(&dev_priv->bdev, type, &gman->manager);
ttm_resource_manager_set_used(man, true);
return 0;
}
void vmw_gmrid_man_fini(struct vmw_private *dev_priv, int type)
{
struct ttm_resource_manager *man = ttm_manager_type(&dev_priv->bdev, type);
struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
ttm_resource_manager_set_used(man, false);
ttm_resource_manager_evict_all(&dev_priv->bdev, man);
ttm_resource_manager_cleanup(man);
ttm_set_driver_manager(&dev_priv->bdev, type, NULL);
ida_destroy(&gman->gmr_ida);
kfree(gman);
}
static const struct ttm_resource_manager_func vmw_gmrid_manager_func = {
.alloc = vmw_gmrid_man_get_node,
.free = vmw_gmrid_man_put_node,
};
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