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/* SPDX-License-Identifier: GPL-2.0 OR MIT */
/**************************************************************************
*
* 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 <drm/ttm/ttm_device.h>
#include <drm/ttm/ttm_placement.h>
#include <drm/ttm/ttm_range_manager.h>
#include <drm/ttm/ttm_bo_api.h>
#include <drm/drm_mm.h>
#include <linux/slab.h>
#include <linux/spinlock.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 ttm_resource_manager manager;
struct drm_mm mm;
spinlock_t lock;
};
static inline struct ttm_range_manager *
to_range_manager(struct ttm_resource_manager *man)
{
return container_of(man, struct ttm_range_manager, manager);
}
static int ttm_range_man_alloc(struct ttm_resource_manager *man,
struct ttm_buffer_object *bo,
const struct ttm_place *place,
struct ttm_resource **res)
{
struct ttm_range_manager *rman = to_range_manager(man);
struct ttm_range_mgr_node *node;
struct drm_mm *mm = &rman->mm;
enum drm_mm_insert_mode mode;
unsigned long lpfn;
int ret;
lpfn = place->lpfn;
if (!lpfn)
lpfn = man->size;
node = kzalloc(struct_size(node, mm_nodes, 1), GFP_KERNEL);
if (!node)
return -ENOMEM;
mode = DRM_MM_INSERT_BEST;
if (place->flags & TTM_PL_FLAG_TOPDOWN)
mode = DRM_MM_INSERT_HIGH;
ttm_resource_init(bo, place, &node->base);
spin_lock(&rman->lock);
ret = drm_mm_insert_node_in_range(mm, &node->mm_nodes[0],
node->base.num_pages,
bo->page_alignment, 0,
place->fpfn, lpfn, mode);
spin_unlock(&rman->lock);
if (unlikely(ret)) {
kfree(node);
return ret;
}
node->base.start = node->mm_nodes[0].start;
*res = &node->base;
return 0;
}
static void ttm_range_man_free(struct ttm_resource_manager *man,
struct ttm_resource *res)
{
struct ttm_range_mgr_node *node = to_ttm_range_mgr_node(res);
struct ttm_range_manager *rman = to_range_manager(man);
spin_lock(&rman->lock);
drm_mm_remove_node(&node->mm_nodes[0]);
spin_unlock(&rman->lock);
kfree(node);
}
static void ttm_range_man_debug(struct ttm_resource_manager *man,
struct drm_printer *printer)
{
struct ttm_range_manager *rman = to_range_manager(man);
spin_lock(&rman->lock);
drm_mm_print(&rman->mm, printer);
spin_unlock(&rman->lock);
}
static const struct ttm_resource_manager_func ttm_range_manager_func = {
.alloc = ttm_range_man_alloc,
.free = ttm_range_man_free,
.debug = ttm_range_man_debug
};
/**
* ttm_range_man_init_nocheck - Initialise a generic range manager for the
* selected memory type.
*
* @bdev: ttm device
* @type: memory manager type
* @use_tt: if the memory manager uses tt
* @p_size: size of area to be managed in pages.
*
* The range manager is installed for this device in the type slot.
*
* Return: %0 on success or a negative error code on failure
*/
int ttm_range_man_init_nocheck(struct ttm_device *bdev,
unsigned type, bool use_tt,
unsigned long p_size)
{
struct ttm_resource_manager *man;
struct ttm_range_manager *rman;
rman = kzalloc(sizeof(*rman), GFP_KERNEL);
if (!rman)
return -ENOMEM;
man = &rman->manager;
man->use_tt = use_tt;
man->func = &ttm_range_manager_func;
ttm_resource_manager_init(man, p_size);
drm_mm_init(&rman->mm, 0, p_size);
spin_lock_init(&rman->lock);
ttm_set_driver_manager(bdev, type, &rman->manager);
ttm_resource_manager_set_used(man, true);
return 0;
}
EXPORT_SYMBOL(ttm_range_man_init_nocheck);
/**
* ttm_range_man_fini_nocheck - Remove the generic range manager from a slot
* and tear it down.
*
* @bdev: ttm device
* @type: memory manager type
*
* Return: %0 on success or a negative error code on failure
*/
int ttm_range_man_fini_nocheck(struct ttm_device *bdev,
unsigned type)
{
struct ttm_resource_manager *man = ttm_manager_type(bdev, type);
struct ttm_range_manager *rman = to_range_manager(man);
struct drm_mm *mm = &rman->mm;
int ret;
if (!man)
return 0;
ttm_resource_manager_set_used(man, false);
ret = ttm_resource_manager_evict_all(bdev, man);
if (ret)
return ret;
spin_lock(&rman->lock);
drm_mm_clean(mm);
drm_mm_takedown(mm);
spin_unlock(&rman->lock);
ttm_resource_manager_cleanup(man);
ttm_set_driver_manager(bdev, type, NULL);
kfree(rman);
return 0;
}
EXPORT_SYMBOL(ttm_range_man_fini_nocheck);
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