From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
MI_NOOP cannot be preempted which means up to now gem_wsim workloads were
preemptable on batch buffer granularity only.
Add MI_ARB_CHK every 100us so the new default is mid-batch preemption.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
benchmarks/gem_wsim.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/benchmarks/gem_wsim.c b/benchmarks/gem_wsim.c
index 24f518a7770f..f60c086a3f1e 100644
--- a/benchmarks/gem_wsim.c
+++ b/benchmarks/gem_wsim.c
@@ -683,6 +683,25 @@ static unsigned long get_bb_sz(unsigned int duration)
nop_calibration_us, sizeof(uint32_t));
}
+static void
+init_bb(struct w_step *w, unsigned int flags)
+{
+ /* Preemption point every 100us. */
+ const unsigned int arb_period = get_bb_sz(100) / sizeof(uint32_t);
+ unsigned int i;
+ uint32_t *ptr;
+
+ gem_set_domain(fd, w->bb_handle,
+ I915_GEM_DOMAIN_WC, I915_GEM_DOMAIN_WC);
+
+ ptr = gem_mmap__wc(fd, w->bb_handle, 0, w->bb_sz, PROT_WRITE);
+
+ for (i = arb_period; i < w->bb_sz / sizeof(uint32_t); i += arb_period)
+ ptr[i] = 0x5 << 23; /* MI_ARB_CHK */
+
+ munmap(ptr, w->bb_sz);
+}
+
static void
terminate_bb(struct w_step *w, unsigned int flags)
{
@@ -836,6 +855,7 @@ alloc_step_batch(struct workload *wrk, struct w_step *w, unsigned int flags)
w->bb_sz = get_bb_sz(w->duration.max);
w->bb_handle = w->obj[j].handle = gem_create(fd, w->bb_sz);
+ init_bb(w, flags);
terminate_bb(w, flags);
if (flags & SEQNO) {
--
2.17.1
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