Quoting Vinay Belgaumkar (2017-10-12 01:06:35)
> This limitation does not exist in latest kernel. It was removed by this patch-
>
> commit f7978a0c581a8a840a28306f8da43e06e7fef3bf
>
> v2: Added commit id that removes the limitation(Chris Wilson)
> V3: Generic way to find if kernel supports this instead of hardcoding gens(Chris Wilson)
> v4: Optimize the if block (Daniele)
>
> Cc: Michel Thierry <michel.thierry@xxxxxxxxx>
> Cc: Arkadiusz Hiler <arkadiusz.hiler@xxxxxxxxx>
> Cc: Petri Latvala <petri.latvala@xxxxxxxxx>
> Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@xxxxxxxxx>
> ---
> lib/igt_gt.c | 44 ++++++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 42 insertions(+), 2 deletions(-)
>
> diff --git a/lib/igt_gt.c b/lib/igt_gt.c
> index b3f3b38..555e4df 100644
> --- a/lib/igt_gt.c
> +++ b/lib/igt_gt.c
> @@ -209,11 +209,51 @@ void igt_disallow_hang(int fd, igt_hang_t arg)
> }
>
> /**
> + * has_ctx_exec:
> + * @fd: open i915 drm file descriptor
> + * @ring: execbuf ring flag
> + *
> + * This helper function checks if non default context submission is allowed
> + * on a ring.
> + *
> + * Returns:
> + * True if allowed
> + *
> + */
> +bool has_ctx_exec(int fd, unsigned ring)
static or gem_has_context_exec()
> +{
> + 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_create(fd);
> + /* If context submission is not allowed, this will return EINVAL
> + * Otherwise, this will return ENOENT on account of no gem obj
> + * being submitted */
> + supported = __gem_execbuf(fd, &execbuf) == -ENOENT;
> + gem_context_destroy(fd, execbuf.rsvd1);
> +
> + return supported;
> +}
> +
> +/**
> * igt_hang_ring_ctx:
> * @fd: open i915 drm file descriptor
> * @ctx: the contxt specifier
> * @ring: execbuf ring flag
> * @flags: set of flags to control execution
> + * @offset: The resultant gtt offset of the exec obj
> *
> * This helper function injects a hanging batch associated with @ctx into @ring.
> * It returns a #igt_hang_t structure which must be passed to
> @@ -239,8 +279,8 @@ igt_hang_t igt_hang_ctx(int fd,
>
> igt_require_hang_ring(fd, ring);
>
> - /* One day the kernel ABI will be fixed! */
> - igt_require(ctx == 0 || ring == I915_EXEC_RENDER);
> + /* check if non-default ctx submission is allowed */
> + igt_require(ctx == 0 || (has_ctx_exec(fd, ring)));
Good point, we actually have a context so don't need to create a dummy
but just pass it in. We don't actually execute anything in the test so
we should not perturb the context.
-Chris
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