![Marcin Slusarz](/assets/img/avatar_default.png)
It's unused. Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com> Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
159 lines
5.3 KiB
C
159 lines
5.3 KiB
C
/**************************************************************************
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*
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* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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#ifndef TTM_MEMORY_H
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#define TTM_MEMORY_H
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#include <linux/workqueue.h>
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#include <linux/spinlock.h>
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#include <linux/bug.h>
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#include <linux/wait.h>
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#include <linux/errno.h>
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#include <linux/kobject.h>
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#include <linux/mm.h>
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/**
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* struct ttm_mem_shrink - callback to shrink TTM memory usage.
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*
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* @do_shrink: The callback function.
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*
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* Arguments to the do_shrink functions are intended to be passed using
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* inheritance. That is, the argument class derives from struct ttm_mem_shrink,
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* and can be accessed using container_of().
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*/
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struct ttm_mem_shrink {
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int (*do_shrink) (struct ttm_mem_shrink *);
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};
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/**
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* struct ttm_mem_global - Global memory accounting structure.
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*
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* @shrink: A single callback to shrink TTM memory usage. Extend this
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* to a linked list to be able to handle multiple callbacks when needed.
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* @swap_queue: A workqueue to handle shrinking in low memory situations. We
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* need a separate workqueue since it will spend a lot of time waiting
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* for the GPU, and this will otherwise block other workqueue tasks(?)
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* At this point we use only a single-threaded workqueue.
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* @work: The workqueue callback for the shrink queue.
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* @lock: Lock to protect the @shrink - and the memory accounting members,
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* that is, essentially the whole structure with some exceptions.
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* @zones: Array of pointers to accounting zones.
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* @num_zones: Number of populated entries in the @zones array.
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* @zone_kernel: Pointer to the kernel zone.
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* @zone_highmem: Pointer to the highmem zone if there is one.
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* @zone_dma32: Pointer to the dma32 zone if there is one.
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*
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* Note that this structure is not per device. It should be global for all
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* graphics devices.
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*/
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#define TTM_MEM_MAX_ZONES 2
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struct ttm_mem_zone;
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struct ttm_mem_global {
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struct kobject kobj;
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struct ttm_mem_shrink *shrink;
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struct workqueue_struct *swap_queue;
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struct work_struct work;
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spinlock_t lock;
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struct ttm_mem_zone *zones[TTM_MEM_MAX_ZONES];
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unsigned int num_zones;
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struct ttm_mem_zone *zone_kernel;
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#ifdef CONFIG_HIGHMEM
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struct ttm_mem_zone *zone_highmem;
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#else
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struct ttm_mem_zone *zone_dma32;
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#endif
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};
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/**
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* ttm_mem_init_shrink - initialize a struct ttm_mem_shrink object
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*
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* @shrink: The object to initialize.
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* @func: The callback function.
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*/
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static inline void ttm_mem_init_shrink(struct ttm_mem_shrink *shrink,
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int (*func) (struct ttm_mem_shrink *))
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{
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shrink->do_shrink = func;
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}
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/**
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* ttm_mem_register_shrink - register a struct ttm_mem_shrink object.
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*
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* @glob: The struct ttm_mem_global object to register with.
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* @shrink: An initialized struct ttm_mem_shrink object to register.
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*
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* Returns:
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* -EBUSY: There's already a callback registered. (May change).
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*/
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static inline int ttm_mem_register_shrink(struct ttm_mem_global *glob,
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struct ttm_mem_shrink *shrink)
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{
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spin_lock(&glob->lock);
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if (glob->shrink != NULL) {
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spin_unlock(&glob->lock);
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return -EBUSY;
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}
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glob->shrink = shrink;
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spin_unlock(&glob->lock);
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return 0;
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}
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/**
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* ttm_mem_unregister_shrink - unregister a struct ttm_mem_shrink object.
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*
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* @glob: The struct ttm_mem_global object to unregister from.
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* @shrink: A previously registert struct ttm_mem_shrink object.
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*
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*/
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static inline void ttm_mem_unregister_shrink(struct ttm_mem_global *glob,
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struct ttm_mem_shrink *shrink)
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{
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spin_lock(&glob->lock);
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BUG_ON(glob->shrink != shrink);
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glob->shrink = NULL;
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spin_unlock(&glob->lock);
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}
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extern int ttm_mem_global_init(struct ttm_mem_global *glob);
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extern void ttm_mem_global_release(struct ttm_mem_global *glob);
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extern int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
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bool no_wait, bool interruptible);
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extern void ttm_mem_global_free(struct ttm_mem_global *glob,
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uint64_t amount);
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extern int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
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struct page *page,
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bool no_wait, bool interruptible);
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extern void ttm_mem_global_free_page(struct ttm_mem_global *glob,
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struct page *page);
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extern size_t ttm_round_pot(size_t size);
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#endif
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