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/**************************************************************************
*
* Copyright 2007-2008 VMware, Inc.
* Copyright 2015 Advanced Micro Devices, Inc.
* 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 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.
*
**************************************************************************/
#ifndef PB_CACHE_H
#define PB_CACHE_H
#include "pb_buffer.h"
#include "util/list.h"
#include "os/os_thread.h"
/**
* Statically inserted into the driver-specific buffer structure.
*/
struct pb_cache_entry
{
struct list_head head;
struct pb_buffer *buffer; /**< Pointer to the structure this is part of. */
struct pb_cache *mgr;
int64_t start, end; /**< Caching time interval */
unsigned bucket_index;
};
struct pb_cache
{
/* The cache is divided into buckets for minimizing cache misses.
* The driver controls which buffer goes into which bucket.
*/
struct list_head buckets[4];
mtx_t mutex;
uint64_t cache_size;
uint64_t max_cache_size;
unsigned usecs;
unsigned num_buffers;
unsigned bypass_usage;
float size_factor;
void (*destroy_buffer)(struct pb_buffer *buf);
bool (*can_reclaim)(struct pb_buffer *buf);
};
void pb_cache_add_buffer(struct pb_cache_entry *entry);
struct pb_buffer *pb_cache_reclaim_buffer(struct pb_cache *mgr, pb_size size,
unsigned alignment, unsigned usage,
unsigned bucket_index);
void pb_cache_release_all_buffers(struct pb_cache *mgr);
void pb_cache_init_entry(struct pb_cache *mgr, struct pb_cache_entry *entry,
struct pb_buffer *buf, unsigned bucket_index);
void pb_cache_init(struct pb_cache *mgr, uint usecs, float size_factor,
unsigned bypass_usage, uint64_t maximum_cache_size,
void (*destroy_buffer)(struct pb_buffer *buf),
bool (*can_reclaim)(struct pb_buffer *buf));
void pb_cache_deinit(struct pb_cache *mgr);
#endif
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