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loader: Add an environment variable to override driver name choice. 

My vc4 simulator has been implemented so far by having an entrypoint
claiming to be i965, which was a bit gross.  The simulator would be a lot
less special if we entered through the vc4 entrypoint like normal, so add
a loader environment variable to allow the i965 fd to probe as vc4.

Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
This commit is contained in:
Eric Anholt 2017-02-03 11:02:59 -08:00
parent 61bb1a9795
commit 3f462050c2
1 changed files with 11 additions and 0 deletions
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11
src/loader/loader.c
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@ -345,6 +345,17 @@ loader_get_driver_for_fd(int fd)
int vendor_id, chip_id, i, j;
char *driver = NULL;
/* Allow an environment variable to force choosing a different driver
* binary. If that driver binary can't survive on this FD, that's the
* user's problem, but this allows vc4 simulator to run on an i965 host,
* and may be useful for some touch testing of i915 on an i965 host.
*/
if (geteuid() == getuid()) {
driver = getenv("MESA_LOADER_DRIVER_OVERRIDE");
if (driver)
return strdup(driver);
}
if (!loader_get_pci_id_for_fd(fd, &vendor_id, &chip_id)) {
#if HAVE_LIBDRM