Icelake hit an issue where it missed reporting a completion event and
instead jumped straight to a idle->active event (skipping over the
active->idle and not even hitting the lite-restore preemption).
661497511us : process_csb: rcs0 cs-irq head=11, tail=0
661497512us : process_csb: rcs0 csb[0]: status=0x10008002:0x00000020 [lite-restore]
661497512us : trace_ports: rcs0: preempted { 28cc8:11052, 0:0 }
661497513us : trace_ports: rcs0: promote { 28cc8:11054, 0:0 }
661497514us : __i915_request_submit: rcs0 fence 28cc8:11056, current 11052
661497514us : __execlists_submission_tasklet: rcs0: queue_priority_hint:-2147483648, submit:yes
661497515us : trace_ports: rcs0: submit { 28cc8:11056, 0:0 }
661497530us : process_csb: rcs0 cs-irq head=0, tail=1
661497530us : process_csb: rcs0 csb[1]: status=0x10008002:0x00000020 [lite-restore]
661497531us : trace_ports: rcs0: preempted { 28cc8:11054!, 0:0 }
661497535us : trace_ports: rcs0: promote { 28cc8:11056, 0:0 }
661497540us : __i915_request_submit: rcs0 fence 28cc8:11058, current 11054
661497544us : __execlists_submission_tasklet: rcs0: queue_priority_hint:-2147483648, submit:yes
661497545us : trace_ports: rcs0: submit { 28cc8:11058, 0:0 }
661497553us : process_csb: rcs0 cs-irq head=1, tail=2
661497553us : process_csb: rcs0 csb[2]: status=0x10000001:0x00000000 [idle->active]
661497574us : process_csb: process_csb:1538 GEM_BUG_ON(*execlists->active)
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_lrc.c | 63 +++++++++--------------------
1 file changed, 18 insertions(+), 45 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 0ddfbebbcbbc..3aad35b570d4 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -693,6 +693,9 @@ trace_ports(const struct intel_engine_execlists *execlists,
const struct intel_engine_cs *engine =
container_of(execlists, typeof(*engine), execlists);
+ if (!ports[0])
+ return;
+
GEM_TRACE("%s: %s { %llx:%lld%s, %llx:%lld }\n",
engine->name, msg,
ports[0]->fence.context,
@@ -1381,13 +1384,6 @@ reset_in_progress(const struct intel_engine_execlists *execlists)
return unlikely(!__tasklet_is_enabled(&execlists->tasklet));
}
-enum csb_step {
- CSB_NOP,
- CSB_PROMOTE,
- CSB_PREEMPT,
- CSB_COMPLETE,
-};
-
/*
* Starting with Gen12, the status has a new format:
*
@@ -1414,7 +1410,7 @@ enum csb_step {
* bits 47-57: sw context id of the lrc the GT switched away from
* bits 58-63: sw counter of the lrc the GT switched away from
*/
-static inline enum csb_step
+static inline bool
gen12_csb_parse(const struct intel_engine_execlists *execlists, const u32 *csb)
{
u32 lower_dw = csb[0];
@@ -1424,7 +1420,7 @@ gen12_csb_parse(const struct intel_engine_execlists *execlists, const u32 *csb)
bool new_queue = lower_dw & GEN12_CTX_STATUS_SWITCHED_TO_NEW_QUEUE;
if (!ctx_away_valid && ctx_to_valid)
- return CSB_PROMOTE;
+ return true;
/*
* The context switch detail is not guaranteed to be 5 when a preemption
@@ -1434,7 +1430,7 @@ gen12_csb_parse(const struct intel_engine_execlists *execlists, const u32 *csb)
* would require some extra handling, but we don't support that.
*/
if (new_queue && ctx_away_valid)
- return CSB_PREEMPT;
+ return true;
/*
* switch detail = 5 is covered by the case above and we do not expect a
@@ -1443,29 +1439,13 @@ gen12_csb_parse(const struct intel_engine_execlists *execlists, const u32 *csb)
*/
GEM_BUG_ON(GEN12_CTX_SWITCH_DETAIL(upper_dw));
- if (*execlists->active) {
- GEM_BUG_ON(!ctx_away_valid);
- return CSB_COMPLETE;
- }
-
- return CSB_NOP;
+ return false;
}
-static inline enum csb_step
+static inline bool
gen8_csb_parse(const struct intel_engine_execlists *execlists, const u32 *csb)
{
- unsigned int status = *csb;
-
- if (status & GEN8_CTX_STATUS_IDLE_ACTIVE)
- return CSB_PROMOTE;
-
- if (status & GEN8_CTX_STATUS_PREEMPTED)
- return CSB_PREEMPT;
-
- if (*execlists->active)
- return CSB_COMPLETE;
-
- return CSB_NOP;
+ return *csb & (GEN8_CTX_STATUS_IDLE_ACTIVE | GEN8_CTX_STATUS_PREEMPTED);
}
static void process_csb(struct intel_engine_cs *engine)
@@ -1504,7 +1484,7 @@ static void process_csb(struct intel_engine_cs *engine)
rmb();
do {
- enum csb_step csb_step;
+ bool promote;
if (++head == num_entries)
head = 0;
@@ -1532,20 +1512,16 @@ static void process_csb(struct intel_engine_cs *engine)
buf[2 * head + 0], buf[2 * head + 1]);
if (INTEL_GEN(engine->i915) >= 12)
- csb_step = gen12_csb_parse(execlists, buf + 2 * head);
+ promote = gen12_csb_parse(execlists, buf + 2 * head);
else
- csb_step = gen8_csb_parse(execlists, buf + 2 * head);
-
- switch (csb_step) {
- case CSB_PREEMPT: /* cancel old inflight, prepare for switch */
+ promote = gen8_csb_parse(execlists, buf + 2 * head);
+ if (promote) {
+ /* cancel old inflight, prepare for switch */
trace_ports(execlists, "preempted", execlists->active);
-
while (*execlists->active)
execlists_schedule_out(*execlists->active++);
- /* fallthrough */
- case CSB_PROMOTE: /* switch pending to inflight */
- GEM_BUG_ON(*execlists->active);
+ /* switch pending to inflight */
GEM_BUG_ON(!assert_pending_valid(execlists, "promote"));
execlists->active =
memcpy(execlists->inflight,
@@ -1560,9 +1536,10 @@ static void process_csb(struct intel_engine_cs *engine)
ring_set_paused(engine, 0);
WRITE_ONCE(execlists->pending[0], NULL);
- break;
+ } else {
+ GEM_BUG_ON(!*execlists->active);
- case CSB_COMPLETE: /* port0 completed, advanced to port1 */
+ /* port0 completed, advanced to port1 */
trace_ports(execlists, "completed", execlists->active);
/*
@@ -1577,10 +1554,6 @@ static void process_csb(struct intel_engine_cs *engine)
GEM_BUG_ON(execlists->active - execlists->inflight >
execlists_num_ports(execlists));
- break;
-
- case CSB_NOP:
- break;
}
} while (head != tail);
--
2.23.0
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