On 07/03/2015 10:16 AM, Chris Wilson wrote:
On Fri, Jul 03, 2015 at 10:05:05AM +0100, Tvrtko Ursulin wrote:
+bool gem_create__has_stolen_support(int fd)
+{
+ static int has_stolen_support = -1;
+
+ if (has_stolen_support < 0) {
+ struct drm_i915_getparam gp;
+ int val = -1;
+ memset(&gp, 0, sizeof(gp));
+ gp.param = 36; /* CREATE_VERSION */
+ gp.value = &val;
+
+ /* Do we have the extended gem_create_ioctl? */
+ ioctl(fd, DRM_IOCTL_I915_GETPARAM, &gp);
+ has_stolen_support = val >= 1;
If ioctl fails it will declare stolen support. (val remains -1)
I would also suggest "has_stolen_support = val > 1" as clearer.
Tvrtko, -ENOCOFFEE? :)
Ooops don't know why I saw an arithmetic shift there.
Regards,
Tvrtko
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