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)
v5: Use the same context instead of creating a dummy (Chris Wilson)
v6: Changed comment structure and removed extra brackets, local var (Chris Wilson)
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>
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
lib/igt_gt.c | 43 +++++++++++++++++++++++++++++++++++++++++--
1 file changed, 41 insertions(+), 2 deletions(-)
diff --git a/lib/igt_gt.c b/lib/igt_gt.c
index b3f3b38..f50873c 100644
--- a/lib/igt_gt.c
+++ b/lib/igt_gt.c
@@ -209,11 +209,50 @@ void igt_disallow_hang(int fd, igt_hang_t arg)
}
/**
+ * has_ctx_exec:
+ * @fd: open i915 drm file descriptor
+ * @ring: execbuf ring flag
+ * @ctx: Context to be checked
+ *
+ * This helper function checks if non default context submission is allowed
+ * on a ring.
+ *
+ * Returns:
+ * True if allowed
+ *
+ */
+static bool has_ctx_exec(int fd, unsigned ring, uint32_t ctx)
+{
+ struct drm_i915_gem_execbuffer2 execbuf;
+ struct drm_i915_gem_exec_object2 exec;
+
+ /* 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 = ctx;
+ /*
+ * If context submission is not allowed, this will return EINVAL
+ * Otherwise, this will return ENOENT on account of no gem obj
+ * being submitted
+ */
+ return (__gem_execbuf(fd, &execbuf) == -ENOENT);
+}
+
+/**
* 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 +278,8 @@ 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, ctx));
param.context = ctx;
param.size = 0;
--
1.9.1
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