Quoting Vinay Belgaumkar (2017-10-11 18:16:23)
> This limitation does not exist for gen8+. It was removed by this patch-
>
> commit f7978a0c581a8a840a28306f8da43e06e7fef3bf
So where is the mention of gen8 there? And where is the compatibility
test to determine the age of the kernel?
As a hint,
bool has_ctx_exec(int fd, unsigned ring) {
struct drm_i915_gem_execbuffer2 execbuf;
struct drm_i915_gem_exec_object2 exec;
bool supported;
/* silly ABI, the kernel thinks everyone who has BSD also has BSD2 */
if ((ring & ~(3<<13)) == I915_EXEC_BSD) {
if (ring & (3 << 13) && !gem_has_bsd2(fd))
return false;
}
memset(&exec, 0, sizeof(exec));
memset(&execbuf, 0, sizeof(execbuf));
execbuf.buffers_ptr = to_user_pointer(&exec);
execbuf.buffer_count = 1;
execbuf.flags = ring;
execbuf.rsvd1 = gem_context_crate(fd);
supported = __gem_execbuf(fd, &execbuf) == -ENOENT;
gem_context_destroy(execbuf.rsvd1);
return supported;
}
-Chris
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