src/gallium/winsys/lima/drm/lima_drm_winsys.c

   1 /*
   2  * Copyright © 2017 Lima 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, sublicense,
   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 next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * 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 NONINFRINGEMENT.  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 DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include <unistd.h>
  25 #include <fcntl.h>
  26 #include <sys/stat.h>
  27
  28 #include "c11/threads.h"
  29 #include "util/u_hash_table.h"
  30 #include "util/u_pointer.h"
  31 #include "renderonly/renderonly.h"
  32
  33 #include "lima_drm_public.h"
  34
  35 #include "lima/lima_screen.h"
  36
  37 static struct hash_table *fd_tab = NULL;
  38 static mtx_t lima_screen_mutex = _MTX_INITIALIZER_NP;
  39
  40 static void
  41 lima_drm_screen_destroy(struct pipe_screen *pscreen)
  42 {
  43    struct lima_screen *screen = lima_screen(pscreen);
  44    boolean destroy;
  45    int fd = screen->fd;
  46
  47    mtx_lock(&lima_screen_mutex);
  48    destroy = --screen->refcnt == 0;
  49    if (destroy)
  50       _mesa_hash_table_remove_key(fd_tab, intptr_to_pointer(fd));
  51    mtx_unlock(&lima_screen_mutex);
  52
  53    if (destroy) {
  54       pscreen->destroy = screen->winsys_priv;
  55       pscreen->destroy(pscreen);
  56       close(fd);
  57    }
  58 }
  59
  60 struct pipe_screen *
  61 lima_drm_screen_create(int fd)
  62 {
  63    struct pipe_screen *pscreen = NULL;
  64
  65    mtx_lock(&lima_screen_mutex);
  66    if (!fd_tab) {
  67       fd_tab = util_hash_table_create_fd_keys();
  68       if (!fd_tab)
  69          goto unlock;
  70    }
  71
  72    pscreen = util_hash_table_get(fd_tab, intptr_to_pointer(fd));
  73    if (pscreen) {
  74       lima_screen(pscreen)->refcnt++;
  75    } else {
  76       int dup_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3);
  77
  78       pscreen = lima_screen_create(dup_fd, NULL);
  79       if (pscreen) {
  80          _mesa_hash_table_insert(fd_tab, intptr_to_pointer(dup_fd), pscreen);
  81
  82          /* Bit of a hack, to avoid circular linkage dependency,
  83           * ie. pipe driver having to call in to winsys, we
  84           * override the pipe drivers screen->destroy():
  85           */
  86          lima_screen(pscreen)->winsys_priv = pscreen->destroy;
  87          pscreen->destroy = lima_drm_screen_destroy;
  88       }
  89    }
  90
  91 unlock:
  92    mtx_unlock(&lima_screen_mutex);
  93    return pscreen;
  94 }
  95
  96 struct pipe_screen *
  97 lima_drm_screen_create_renderonly(struct renderonly *ro)
  98 {
  99    return lima_screen_create(fcntl(ro->gpu_fd, F_DUPFD_CLOEXEC, 3), ro);
 100 }