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egl/surfaceless: Allow DRMless fallback.

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Allow platform_surfaceless to use swrast even if DRM is not available.
To be used to allow a fuzzer for virgl to be run on a jailed VM without
hardware GL or DRM support.

Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Chad Versace <chadversary@chromium.org>
Signed-off-by: David Riley <davidriley@chromium.org>
This commit is contained in:
David Riley 2018-07-17 17:12:05 -07:00 • committed by Chad Versace
parent b169b84be6
commit f94681b6e2
1 changed files with 19 additions and 0 deletions
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19
src/egl/drivers/dri2/platform_surfaceless.c
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@ -293,6 +293,7 @@ surfaceless_probe_device(_EGLDisplay *dpy, bool swrast)
int fd;
int i;
/* Attempt to find DRM device. */
for (i = 0; i < limit; ++i) {
char *card_path;
if (asprintf(&card_path, DRM_RENDER_DEV_NAME, DRM_DIR_NAME, base + i) < 0)
@ -326,6 +327,24 @@ surfaceless_probe_device(_EGLDisplay *dpy, bool swrast)
dri2_dpy->loader_extensions = NULL;
}
/* No DRM device, so attempt to fall back to software path w/o DRM. */
if (swrast) {
_eglLog(_EGL_DEBUG, "Falling back to surfaceless swrast without DRM.");
dri2_dpy->fd = -1;
dri2_dpy->driver_name = strdup("swrast");
if (!dri2_dpy->driver_name) {
return false;
}
if (dri2_load_driver_swrast(dpy)) {
dri2_dpy->loader_extensions = swrast_loader_extensions;
return true;
}
free(dri2_dpy->driver_name);
dri2_dpy->driver_name = NULL;
}
return false;
}