src/gallium/winsys/etnaviv/drm/etnaviv_drm_winsys.c

   1 /*
   2  * Copyright (c) 2015 Etnaviv Project
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sub license,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the
  12  * next paragraph) shall be included in all copies or substantial portions
  13  * of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Christian Gmeiner <christian.gmeiner@gmail.com>
  25  */
  26
  27 #include <sys/stat.h>
  28
  29 #include "util/u_hash_table.h"
  30 #include "util/u_memory.h"
  31
  32 #include "etnaviv/etnaviv_screen.h"
  33 #include "etnaviv/hw/common.xml.h"
  34 #include "etnaviv_drm_public.h"
  35
  36 #include <stdio.h>
  37
  38 static struct pipe_screen *
  39 screen_create(struct renderonly *ro)
  40 {
  41    struct etna_device *dev;
  42    struct etna_gpu *gpu;
  43    uint64_t val;
  44    int i;
  45
  46    dev = etna_device_new_dup(ro->gpu_fd);
  47    if (!dev) {
  48       fprintf(stderr, "Error creating device\n");
  49       return NULL;
  50    }
  51
  52    for (i = 0;; i++) {
  53       gpu = etna_gpu_new(dev, i);
  54       if (!gpu) {
  55          fprintf(stderr, "Error creating gpu\n");
  56          return NULL;
  57       }
  58
  59       /* Look for a 3D capable GPU */
  60       int ret = etna_gpu_get_param(gpu, ETNA_GPU_FEATURES_0, &val);
  61       if (ret == 0 && (val & chipFeatures_PIPE_3D))
  62          break;
  63
  64       etna_gpu_del(gpu);
  65    }
  66
  67    return etna_screen_create(dev, gpu, ro);
  68 }
  69
  70 static struct util_hash_table *etna_tab = NULL;
  71
  72 static mtx_t etna_screen_mutex = _MTX_INITIALIZER_NP;
  73
  74 static void
  75 etna_drm_screen_destroy(struct pipe_screen *pscreen)
  76 {
  77    struct etna_screen *screen = etna_screen(pscreen);
  78    boolean destroy;
  79
  80    mtx_lock(&etna_screen_mutex);
  81    destroy = --screen->refcnt == 0;
  82    if (destroy) {
  83       int fd = etna_device_fd(screen->dev);
  84       util_hash_table_remove(etna_tab, intptr_to_pointer(fd));
  85    }
  86    pipe_mutex_unlock(etna_screen_mutex);
  87
  88    if (destroy) {
  89       pscreen->destroy = screen->winsys_priv;
  90       pscreen->destroy(pscreen);
  91    }
  92 }
  93
  94 static unsigned hash_fd(void *key)
  95 {
  96    int fd = pointer_to_intptr(key);
  97    struct stat stat;
  98
  99    fstat(fd, &stat);
 100
 101    return stat.st_dev ^ stat.st_ino ^ stat.st_rdev;
 102 }
 103
 104 static int compare_fd(void *key1, void *key2)
 105 {
 106    int fd1 = pointer_to_intptr(key1);
 107    int fd2 = pointer_to_intptr(key2);
 108    struct stat stat1, stat2;
 109
 110    fstat(fd1, &stat1);
 111    fstat(fd2, &stat2);
 112
 113    return stat1.st_dev != stat2.st_dev ||
 114           stat1.st_ino != stat2.st_ino ||
 115           stat1.st_rdev != stat2.st_rdev;
 116 }
 117
 118 struct pipe_screen *
 119 etna_drm_screen_create_renderonly(struct renderonly *ro)
 120 {
 121    struct pipe_screen *pscreen = NULL;
 122
 123    mtx_lock(&etna_screen_mutex);
 124    if (!etna_tab) {
 125       etna_tab = util_hash_table_create(hash_fd, compare_fd);
 126       if (!etna_tab)
 127          goto unlock;
 128    }
 129
 130    pscreen = util_hash_table_get(etna_tab, intptr_to_pointer(ro->gpu_fd));
 131    if (pscreen) {
 132       etna_screen(pscreen)->refcnt++;
 133    } else {
 134       pscreen = screen_create(ro);
 135       if (pscreen) {
 136          int fd = etna_device_fd(etna_screen(pscreen)->dev);
 137          util_hash_table_set(etna_tab, intptr_to_pointer(fd), pscreen);
 138
 139          /* Bit of a hack, to avoid circular linkage dependency,
 140          * ie. pipe driver having to call in to winsys, we
 141          * override the pipe drivers screen->destroy() */
 142          etna_screen(pscreen)->winsys_priv = pscreen->destroy;
 143       pscreen->destroy = etna_drm_screen_destroy;
 144       }
 145    }
 146
 147 unlock:
 148    pipe_mutex_unlock(etna_screen_mutex);
 149    return pscreen;
 150 }
 151
 152 struct pipe_screen *
 153 etna_drm_screen_create(int fd)
 154 {
 155    struct renderonly ro = {
 156       .create_for_resource = renderonly_create_gpu_import_for_resource,
 157       .kms_fd = -1,
 158       .gpu_fd = fd
 159    };
 160
 161    return etna_drm_screen_create_renderonly(&ro);
 162 }