From: Emil Velikov <emil.veli...@collabora.com>
Unlike the other platforms, here we aim do guess if the device that we
somewhat arbitrarily picked, is supported or not.
In particular: when a vendor is _not_ requested we loop through all
devices, picking the first one which can create a DRI screen.
When a vendor is requested - we use that and do _not_ fall-back to any
other device.
The former seems a bit fiddly, but considering EGL_EXT_explicit_device and
EGL_MESA_query_renderer are MIA, this is the best we can do for the
moment.
With those (proposed) extensions userspace will be able to create a
separate EGL display for each device, query device details and make the
conscious decision which one to use.
Cc: Robert Foss <robert.f...@collabora.com>
Cc: Tomasz Figa <tf...@chromium.org>
Signed-off-by: Emil Velikov <emil.veli...@collabora.com>
---
Thanks for the clarification Tomasz. The original code was using a
fall-back even a vendor was explicitly requested, confusing me a bit ;-)
---
src/egl/drivers/dri2/platform_android.c | 71 +++++++++++++++----------
1 file changed, 43 insertions(+), 28 deletions(-)
diff --git a/src/egl/drivers/dri2/platform_android.c
b/src/egl/drivers/dri2/platform_android.c
index 1f9fe27ab85..5bf627dec7d 100644
--- a/src/egl/drivers/dri2/platform_android.c
+++ b/src/egl/drivers/dri2/platform_android.c
@@ -1420,13 +1420,32 @@ droid_filter_device(_EGLDisplay *disp, int fd, const
char *vendor)
return 0;
}
+static int
+droid_probe_device(_EGLDisplay *disp)
+{
+ /* Check that the device is supported, by attempting to:
+ * - load the dri module
+ * - and, create a screen
+ */
+ if (!droid_load_driver(disp)) {
+ _eglLog(_EGL_WARNING, "DRI2: failed to load driver");
+ return -1;
+ }
+
+ if (!dri2_create_screen(disp)) {
+ _eglLog(_EGL_WARNING, "DRI2: failed to create screen");
+ return -1;
+ }
+ return 0;
+}
+
static int
droid_open_device(_EGLDisplay *disp)
{
#define MAX_DRM_DEVICES 32
drmDevicePtr device, devices[MAX_DRM_DEVICES] = { NULL };
int prop_set, num_devices;
- int fd = -1, fallback_fd = -1;
+ int fd = -1;
char *vendor_name = NULL;
char vendor_buf[PROPERTY_VALUE_MAX];
@@ -1451,33 +1470,39 @@ droid_open_device(_EGLDisplay *disp)
continue;
}
- if (vendor_name && droid_filter_device(disp, fd, vendor_name)) {
- /* Match requested, but not found - set as fallback */
- if (fallback_fd == -1) {
- fallback_fd = fd;
- } else {
+ /* If a vendor is explicitly provided, we use only that.
+ * Otherwise we fall-back the first device that is supported.
+ */
+ if (vendor_name) {
+ if (droid_filter_device(disp, fd, vendor_name)) {
+ /* Device does not match - try next device */
close(fd);
fd = -1;
+ continue;
}
-
+ /* If the requested device matches use it, regardless if
+ * init fails. Do not fall-back to any other device.
+ */
+ if (droid_probbe_device(disp)) {
+ close(fd);
+ fd = -1;
+ }
+ break;
+ }
+ /* No explicit request - attempt the next device */
+ if (droid_probbe_device(disp)) {
+ close(fd);
+ fd = -1;
continue;
}
- /* Found a device */
break;
}
drmFreeDevices(devices, num_devices);
- if (fallback_fd < 0 && fd < 0) {
- _eglLog(_EGL_WARNING, "Failed to open any DRM device");
- return -1;
- }
-
- if (fd < 0) {
- _eglLog(_EGL_WARNING, "Failed to open desired DRM device, using
fallback");
- return fallback_fd;
- }
+ if (fd < 0)
+ _eglLog(_EGL_WARNING, "Failed to open %s DRM device",
+ vendor_name ? "desired": "any");
- close(fallback_fd);
return fd;
#undef MAX_DRM_DEVICES
}
@@ -1519,16 +1544,6 @@ dri2_initialize_android(_EGLDriver *drv, _EGLDisplay
*disp)
goto cleanup;
}
- if (!droid_load_driver(disp)) {
- err = "DRI2: failed to load driver";
- goto cleanup;
- }
-
- if (!dri2_create_screen(disp)) {
- err = "DRI2: failed to create screen";
- goto cleanup;
- }
-
if (!dri2_setup_extensions(disp)) {
err = "DRI2: failed to setup extensions";
goto cleanup;
--
2.18.0
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