1 files changed, 124 insertions, 0 deletions
diff --git a/src/gallium/winsys/lima/drm/lima_drm_winsys.c b/src/gallium/winsys/lima/drm/lima_drm_winsys.c
new file mode 100644
index 00000000000..07690307c64
--- /dev/null
+++ b/src/gallium/winsys/lima/drm/lima_drm_winsys.c
@@ -0,0 +1,124 @@
+/*
+ * Copyright © 2017 Lima Project
+ *
+ * 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, sublicense,
+ * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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.
+ */
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+
+#include "c11/threads.h"
+#include "util/u_hash_table.h"
+#include "util/u_pointer.h"
+#include "renderonly/renderonly.h"
+
+#include "lima_drm_public.h"
+
+#include "lima/lima_screen.h"
+
+static struct util_hash_table *fd_tab = NULL;
+static mtx_t lima_screen_mutex = _MTX_INITIALIZER_NP;
+
+static void
+lima_drm_screen_destroy(struct pipe_screen *pscreen)
+{
+   struct lima_screen *screen = lima_screen(pscreen);
+   boolean destroy;
+   int fd = screen->fd;
+
+   mtx_lock(&lima_screen_mutex);
+   destroy = --screen->refcnt == 0;
+   if (destroy)
+      util_hash_table_remove(fd_tab, intptr_to_pointer(fd));
+   mtx_unlock(&lima_screen_mutex);
+
+   if (destroy) {
+      pscreen->destroy = screen->winsys_priv;
+      pscreen->destroy(pscreen);
+      close(fd);
+   }
+}
+
+static unsigned hash_fd(void *key)
+{
+   int fd = pointer_to_intptr(key);
+   struct stat stat;
+
+   fstat(fd, &stat);
+
+   return stat.st_dev ^ stat.st_ino ^ stat.st_rdev;
+}
+
+static int compare_fd(void *key1, void *key2)
+{
+   int fd1 = pointer_to_intptr(key1);
+   int fd2 = pointer_to_intptr(key2);
+   struct stat stat1, stat2;
+
+   fstat(fd1, &stat1);
+   fstat(fd2, &stat2);
+
+   return stat1.st_dev != stat2.st_dev ||
+          stat1.st_ino != stat2.st_ino ||
+          stat1.st_rdev != stat2.st_rdev;
+}
+
+struct pipe_screen *
+lima_drm_screen_create(int fd)
+{
+   struct pipe_screen *pscreen = NULL;
+
+   mtx_lock(&lima_screen_mutex);
+   if (!fd_tab) {
+      fd_tab = util_hash_table_create(hash_fd, compare_fd);
+      if (!fd_tab)
+         goto unlock;
+   }
+
+   pscreen = util_hash_table_get(fd_tab, intptr_to_pointer(fd));
+   if (pscreen) {
+      lima_screen(pscreen)->refcnt++;
+   } else {
+      int dup_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3);
+
+      pscreen = lima_screen_create(dup_fd, NULL);
+      if (pscreen) {
+         util_hash_table_set(fd_tab, intptr_to_pointer(dup_fd), pscreen);
+
+         /* Bit of a hack, to avoid circular linkage dependency,
+          * ie. pipe driver having to call in to winsys, we
+          * override the pipe drivers screen->destroy():
+          */
+         lima_screen(pscreen)->winsys_priv = pscreen->destroy;
+         pscreen->destroy = lima_drm_screen_destroy;
+      }
+   }
+
+unlock:
+   mtx_unlock(&lima_screen_mutex);
+   return pscreen;
+}
+
+struct pipe_screen *
+lima_drm_screen_create_renderonly(struct renderonly *ro)
+{
+   return lima_screen_create(fcntl(ro->gpu_fd, F_DUPFD_CLOEXEC, 3), ro);
+}