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      1 
      2 /**********************************************************
      3  * Copyright 2008-2009 VMware, Inc.  All rights reserved.
      4  *
      5  * Permission is hereby granted, free of charge, to any person
      6  * obtaining a copy of this software and associated documentation
      7  * files (the "Software"), to deal in the Software without
      8  * restriction, including without limitation the rights to use, copy,
      9  * modify, merge, publish, distribute, sublicense, and/or sell copies
     10  * of the Software, and to permit persons to whom the Software is
     11  * furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be
     14  * included in all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     17  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     19  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
     20  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
     21  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
     22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     23  * SOFTWARE.
     24  *
     25  **********************************************************/
     26 
     27 #ifndef SVGA_SCREEN_CACHE_H_
     28 #define SVGA_SCREEN_CACHE_H_
     29 
     30 
     31 #include "svga_types.h"
     32 #include "svga_reg.h"
     33 #include "svga3d_reg.h"
     34 
     35 #include "os/os_thread.h"
     36 
     37 #include "util/u_double_list.h"
     38 
     39 
     40 /* Guess the storage size of cached surfaces and try and keep it under
     41  * this amount:
     42  */
     43 #define SVGA_HOST_SURFACE_CACHE_BYTES (16 * 1024 * 1024)
     44 
     45 /* Maximum number of discrete surfaces in the cache:
     46  */
     47 #define SVGA_HOST_SURFACE_CACHE_SIZE 1024
     48 
     49 /* Number of hash buckets:
     50  */
     51 #define SVGA_HOST_SURFACE_CACHE_BUCKETS 256
     52 
     53 
     54 struct svga_winsys_surface;
     55 struct svga_screen;
     56 
     57 /**
     58  * Same as svga_winsys_screen::surface_create.
     59  */
     60 struct svga_host_surface_cache_key
     61 {
     62    SVGA3dSurfaceFlags flags;
     63    SVGA3dSurfaceFormat format;
     64    SVGA3dSize size;
     65    uint32_t numFaces:24;
     66    uint32_t numMipLevels:7;
     67    uint32_t cachable:1;         /* False if this is a shared surface */
     68 };
     69 
     70 
     71 struct svga_host_surface_cache_entry
     72 {
     73    /**
     74     * Head for the LRU list, svga_host_surface_cache::unused, and
     75     * svga_host_surface_cache::empty
     76     */
     77    struct list_head head;
     78 
     79    /** Head for the bucket lists. */
     80    struct list_head bucket_head;
     81 
     82    struct svga_host_surface_cache_key key;
     83    struct svga_winsys_surface *handle;
     84 
     85    struct pipe_fence_handle *fence;
     86 };
     87 
     88 
     89 /**
     90  * Cache of the host surfaces.
     91  *
     92  * A cache entry can be in the following stages:
     93  * 1. empty (entry->handle = NULL)
     94  * 2. holding a buffer in a validate list
     95  * 3. holding a flushed buffer (not in any validate list) with an active fence
     96  * 4. holding a flushed buffer with an expired fence
     97  *
     98  * An entry progresses from 1 -> 2 -> 3 -> 4. When we need an entry to put a
     99  * buffer into we preferencial take from 1, or from the least recentely used
    100  * buffer from 3/4.
    101  */
    102 struct svga_host_surface_cache
    103 {
    104    pipe_mutex mutex;
    105 
    106    /* Unused buffers are put in buckets to speed up lookups */
    107    struct list_head bucket[SVGA_HOST_SURFACE_CACHE_BUCKETS];
    108 
    109    /* Entries with unused buffers, ordered from most to least recently used
    110     * (3 and 4) */
    111    struct list_head unused;
    112 
    113    /* Entries with buffers still in validate lists (2) */
    114    struct list_head validated;
    115 
    116    /** Empty entries (1) */
    117    struct list_head empty;
    118 
    119    /** The actual storage for the entries */
    120    struct svga_host_surface_cache_entry entries[SVGA_HOST_SURFACE_CACHE_SIZE];
    121 
    122    /** Sum of sizes of all surfaces (in bytes) */
    123    unsigned total_size;
    124 };
    125 
    126 
    127 void
    128 svga_screen_cache_cleanup(struct svga_screen *svgascreen);
    129 
    130 void
    131 svga_screen_cache_flush(struct svga_screen *svgascreen,
    132                         struct pipe_fence_handle *fence);
    133 
    134 enum pipe_error
    135 svga_screen_cache_init(struct svga_screen *svgascreen);
    136 
    137 
    138 struct svga_winsys_surface *
    139 svga_screen_surface_create(struct svga_screen *svgascreen,
    140                            struct svga_host_surface_cache_key *key);
    141 
    142 void
    143 svga_screen_surface_destroy(struct svga_screen *svgascreen,
    144                             const struct svga_host_surface_cache_key *key,
    145                             struct svga_winsys_surface **handle);
    146 
    147 
    148 #endif /* SVGA_SCREEN_CACHE_H_ */
    149