@@ -3036,15 +3036,21 @@ static int bond_virtual_engine(struct intel_gt *gt,
struct i915_gem_context *ctx;
struct i915_request *rq[16];
enum intel_engine_id id;
+ struct igt_spinner spin;
unsigned long n;
int err;
GEM_BUG_ON(nsibling >= ARRAY_SIZE(rq) - 1);
- ctx = kernel_context(gt->i915);
- if (!ctx)
+ if (igt_spinner_init(&spin, gt))
return -ENOMEM;
+ ctx = kernel_context(gt->i915);
+ if (!ctx) {
+ err = -ENOMEM;
+ goto err_spin;
+ }
+
err = 0;
rq[0] = ERR_PTR(-ENOMEM);
for_each_engine(master, gt, id) {
@@ -3055,7 +3061,7 @@ static int bond_virtual_engine(struct intel_gt *gt,
memset_p((void *)rq, ERR_PTR(-EINVAL), ARRAY_SIZE(rq));
- rq[0] = igt_request_alloc(ctx, master);
+ rq[0] = spinner_create_request(&spin, ctx, master, MI_NOOP);
if (IS_ERR(rq[0])) {
err = PTR_ERR(rq[0]);
goto out;
@@ -3068,10 +3074,17 @@ static int bond_virtual_engine(struct intel_gt *gt,
&fence,
GFP_KERNEL);
}
+
i915_request_add(rq[0]);
if (err < 0)
goto out;
+ if (!(flags & BOND_SCHEDULE) &&
+ !igt_wait_for_spinner(&spin, rq[0])) {
+ err = -EIO;
+ goto out;
+ }
+
for (n = 0; n < nsibling; n++) {
struct intel_context *ve;
@@ -3119,6 +3132,8 @@ static int bond_virtual_engine(struct intel_gt *gt,
}
}
onstack_fence_fini(&fence);
+ intel_engine_flush_submission(master);
+ igt_spinner_end(&spin);
if (i915_request_wait(rq[0], 0, HZ / 10) < 0) {
pr_err("Master request did not execute (on %s)!\n",
@@ -3156,6 +3171,8 @@ static int bond_virtual_engine(struct intel_gt *gt,
err = -EIO;
kernel_context_close(ctx);
+err_spin:
+ igt_spinner_fini(&spin);
return err;
}
Bonded request submission is designed to allow requests to execute in parallel as laid out by the user. If the master request is already finished before its bonded pair is submitted, the pair were not destined to run in parallel and we lose the information about the master engine to dictate selection of the secondary. If the second request was required to be run on a particular engine in a virtual set, that should have been specified, rather than left to the whims of a random unconnected requests! In the selftest, I made the mistake of not ensuring the master would overlap with its bonded pairs, meaning that it could indeed complete before we submitted the bonds. Those bonds were then free to select any available engine in their virtual set, and not the one expected by the test. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> --- drivers/gpu/drm/i915/gt/selftest_lrc.c | 23 ++++++++++++++++++++--- 1 file changed, 20 insertions(+), 3 deletions(-)