sync with OpenBSD -current

lib/libva/va/x11/va_dri3.c

@@ -0,0 +1,147 @@
+/*
+ * Copyright © 2022 Collabora Ltd.
+ * Copyright (c) 2023 Emil Velikov
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Soft-
+ * ware"), to deal in the Software without restriction, including without
+ * limitation the rights to use, copy, modify, merge, publish, distribute,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, provided that the above copyright
+ * notice(s) and this permission notice appear in all copies of the Soft-
+ * ware and that both the above copyright notice(s) and this permission
+ * notice appear in supporting documentation.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
+ * ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY
+ * RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN
+ * THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSE-
+ * QUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFOR-
+ * MANCE OF THIS SOFTWARE.
+ *
+ * Except as contained in this notice, the name of a copyright holder shall
+ * not be used in advertising or otherwise to promote the sale, use or
+ * other dealings in this Software without prior written authorization of
+ * the copyright holder.
+ *
+ * Authors:
+ *   Emil Velikov (emil.velikov@collabora.com)
+ */
+
+#include "sysdeps.h"
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+#include <xcb/xcb.h>
+#include <xcb/dri3.h>
+
+#include <X11/Xlib-xcb.h>
+#include <xf86drm.h>
+
+#include "va_backend.h"
+#include "va_drmcommon.h"
+#include "drm/va_drm_utils.h"
+
+static xcb_screen_t *
+va_DRI3GetXCBScreen(xcb_connection_t *conn, int screen)
+{
+    xcb_screen_iterator_t iter;
+
+    iter = xcb_setup_roots_iterator(xcb_get_setup(conn));
+    for (; iter.rem; --screen, xcb_screen_next(&iter))
+        if (screen == 0)
+            return iter.data;
+    return NULL;
+}
+
+static int
+va_isDRI3Connected(VADriverContextP ctx, int *outfd)
+{
+    xcb_connection_t *conn = XGetXCBConnection(ctx->native_dpy);
+    xcb_screen_t *screen;
+    xcb_window_t root;
+    const xcb_query_extension_reply_t *ext;
+    xcb_dri3_open_cookie_t cookie;
+    xcb_dri3_open_reply_t *reply;
+    int fd;
+    char *render_node;
+
+    if (!conn)
+        return -1;
+
+    screen = va_DRI3GetXCBScreen(conn, ctx->x11_screen);
+    if (!screen)
+        return -1;
+
+    root = screen->root;
+
+    xcb_prefetch_extension_data(conn, &xcb_dri3_id);
+    ext = xcb_get_extension_data(conn, &xcb_dri3_id);
+    if (!ext || !ext->present)
+        return -1;
+
+    /* We don't require any of the ancy stuff, so there's no point in checking
+     * the version.
+     */
+
+    cookie = xcb_dri3_open(conn, root, 0 /* provider */);
+    reply = xcb_dri3_open_reply(conn, cookie, NULL /* error */);
+
+    if (!reply || reply->nfd != 1) {
+        free(reply);
+        return -1;
+    }
+
+    fd = xcb_dri3_open_reply_fds(conn, reply)[0];
+    free(reply);
+
+    /* The server can give us primary or a render node.
+     * In case of the former we need to swap it for the latter.
+     */
+    switch (drmGetNodeTypeFromFd(fd)) {
+    case DRM_NODE_PRIMARY:
+        render_node = drmGetRenderDeviceNameFromFd(fd);
+        close(fd);
+        if (!render_node)
+            return -1;
+
+        fd = open(render_node, O_RDWR | O_CLOEXEC);
+        free(render_node);
+        if (fd == -1)
+            return -1;
+
+        break;
+    case DRM_NODE_RENDER:
+        fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
+        break;
+    default:
+        close(fd);
+        return -1;
+    }
+
+    *outfd = fd;
+    return 0;
+}
+
+VAStatus va_DRI3_GetDriverNames(
+    VADisplayContextP pDisplayContext,
+    char **drivers,
+    unsigned *num_drivers
+)
+{
+    VADriverContextP const ctx = pDisplayContext->pDriverContext;
+    struct drm_state * const drm_state = ctx->drm_state;
+    int fd = -1;
+
+    if (va_isDRI3Connected(ctx, &fd) && fd != -1)
+        return VA_STATUS_ERROR_UNKNOWN;
+
+    drm_state->fd = fd;
+    drm_state->auth_type = VA_DRM_AUTH_CUSTOM;
+    return VA_DRM_GetDriverNames(ctx, drivers, num_drivers);
+}