As we rewrite the batches on the fly to implement the non-preemptible
lock, we need to tell Tigerlake to read the batch afresh each time.
Amusingly, the disable is a part of an arb-check, so we have to be
careful not to include the arbitration point inside our unpreemptible
loop.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
tests/i915/gem_exec_balancer.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/tests/i915/gem_exec_balancer.c b/tests/i915/gem_exec_balancer.c
index 026f8347e..0e3b52900 100644
--- a/tests/i915/gem_exec_balancer.c
+++ b/tests/i915/gem_exec_balancer.c
@@ -1350,6 +1350,11 @@ static void __bonded_dual(int i915,
*out = cycles;
}
+static uint32_t preparser_disable(void)
+{
+ return 0x5 << 23 | 1 << 8 | 1; /* preparser masked disable */
+}
+
static uint32_t sync_from(int i915, uint32_t addr, uint32_t target)
{
uint32_t handle = gem_create(i915, 4096);
@@ -1363,14 +1368,14 @@ static uint32_t sync_from(int i915, uint32_t addr,
uint32_t target)
*cs++ = 0;
*cs++ = 0;
- *cs++ = MI_NOOP;
+ *cs++ = preparser_disable();
*cs++ = MI_NOOP;
*cs++ = MI_NOOP;
*cs++ = MI_NOOP;
/* wait for them to cancel us */
*cs++ = MI_BATCH_BUFFER_START | 1 << 8 | 1;
- *cs++ = addr + 16;
+ *cs++ = addr + 24;
*cs++ = 0;
/* self-heal */
@@ -1393,14 +1398,14 @@ static uint32_t sync_to(int i915, uint32_t addr,
uint32_t target)
cs = map = gem_mmap__device_coherent(i915, handle, 0, 4096, PROT_WRITE);
- *cs++ = MI_NOOP;
+ *cs++ = preparser_disable();
*cs++ = MI_NOOP;
*cs++ = MI_NOOP;
*cs++ = MI_NOOP;
/* wait to be cancelled */
*cs++ = MI_BATCH_BUFFER_START | 1 << 8 | 1;
- *cs++ = addr;
+ *cs++ = addr + 8;
*cs++ = 0;
/* cancel their spin as a compliment */
--
2.27.0.rc2
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