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/os_file.h"
  30 #include "util/u_hash_table.h"
  31 #include "util/u_pointer.h"
  32 #include "renderonly/renderonly.h"
  33
  34 #include "lima_drm_public.h"
  35
  36 #include "lima/lima_screen.h"
  37
  38 static struct hash_table *fd_tab = NULL;
  39 static mtx_t lima_screen_mutex = _MTX_INITIALIZER_NP;
  40
  41 static void
  42 lima_drm_screen_destroy(struct pipe_screen *pscreen)
  43 {
  44    struct lima_screen *screen = lima_screen(pscreen);
  45    boolean destroy;
  46    int fd = screen->fd;
  47
  48    mtx_lock(&lima_screen_mutex);
  49    destroy = --screen->refcnt == 0;
  50    if (destroy)
  51       _mesa_hash_table_remove_key(fd_tab, intptr_to_pointer(fd));
  52    mtx_unlock(&lima_screen_mutex);
  53
  54    if (destroy) {
  55       pscreen->destroy = screen->winsys_priv;
  56       pscreen->destroy(pscreen);
  57       close(fd);
  58    }
  59 }
  60
  61 struct pipe_screen *
  62 lima_drm_screen_create(int fd)
  63 {
  64    struct pipe_screen *pscreen = NULL;
  65
  66    mtx_lock(&lima_screen_mutex);
  67    if (!fd_tab) {
  68       fd_tab = util_hash_table_create_fd_keys();
  69       if (!fd_tab)
  70          goto unlock;
  71    }
  72
  73    pscreen = util_hash_table_get(fd_tab, intptr_to_pointer(fd));
  74    if (pscreen) {
  75       lima_screen(pscreen)->refcnt++;
  76    } else {
  77       int dup_fd = os_dupfd_cloexec(fd);
  78
  79       pscreen = lima_screen_create(dup_fd, NULL);
  80       if (pscreen) {
  81          _mesa_hash_table_insert(fd_tab, intptr_to_pointer(dup_fd), pscreen);
  82
  83          /* Bit of a hack, to avoid circular linkage dependency,
  84           * ie. pipe driver having to call in to winsys, we
  85           * override the pipe drivers screen->destroy():
  86           */
  87          lima_screen(pscreen)->winsys_priv = pscreen->destroy;
  88          pscreen->destroy = lima_drm_screen_destroy;
  89       }
  90    }
  91
  92 unlock:
  93    mtx_unlock(&lima_screen_mutex);
  94    return pscreen;
  95 }
  96
  97 struct pipe_screen *
  98 lima_drm_screen_create_renderonly(struct renderonly *ro)
  99 {
 100    return lima_screen_create(os_dupfd_cloexec(ro->gpu_fd), ro);
 101 }