On 9/9/2023 3:38 PM, Alan Previn wrote:
Update the max GSC-fw response time to match updated internal
fw specs. Because this response time is an SLA on the firmware,
not inclusive of i915->GuC->HW handoff latency, when submitting
requests to the GSC fw via intel_gsc_uc_heci_cmd_submit helpers,
start the count after the request hits the GSC command streamer.
Also, move GSC_REPLY_LATENCY_MS definition from pxp header to
intel_gsc_uc_heci_cmd_submit.h since its for any GSC HECI packet.
Signed-off-by: Alan Previn
---
.../i915/gt/uc/intel_gsc_uc_heci_cmd_submit.c | 20 +--
.../i915/gt/uc/intel_gsc_uc_heci_cmd_submit.h | 6 ++
drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h| 11 ++
3 files changed, 31 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_heci_cmd_submit.c
b/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_heci_cmd_submit.c
index 89ed5ee9cded..fe6a2f78cea0 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_heci_cmd_submit.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_heci_cmd_submit.c
@@ -81,8 +81,17 @@ int intel_gsc_uc_heci_cmd_submit_packet(struct intel_gsc_uc
*gsc, u64 addr_in,
i915_request_add(rq);
- if (!err && i915_request_wait(rq, 0, msecs_to_jiffies(500)) < 0)
- err = -ETIME;
+ if (!err) {
+ /*
+* Start timeout for i915_request_wait only after considering
one possible
+* pending GSC-HECI submission cycle on the other
(non-privileged) path.
+*/
+ if (wait_for(i915_request_started(rq),
GSC_HECI_REPLY_LATENCY_MS))
+ drm_dbg(&gsc_uc_to_gt(gsc)->i915->drm,
+ "Delay in gsc-heci-priv submission to
gsccs-hw");
+ if (i915_request_wait(rq, 0, msecs_to_jiffies(500)) < 0)
+ err = -ETIME;
+ }
i915_request_put(rq);
@@ -186,6 +195,13 @@ intel_gsc_uc_heci_cmd_submit_nonpriv(struct intel_gsc_uc *gsc,
i915_request_add(rq);
if (!err) {
+ /*
+* Start timeout for i915_request_wait only after considering
one possible
+* pending GSC-HECI submission cycle on the other (privileged)
path.
+*/
+ if (wait_for(i915_request_started(rq),
GSC_HECI_REPLY_LATENCY_MS))
+ drm_dbg(&gsc_uc_to_gt(gsc)->i915->drm,
+ "Delay in gsc-heci-non-priv submission to
gsccs-hw");
if (i915_request_wait(rq, I915_WAIT_INTERRUPTIBLE,
msecs_to_jiffies(timeout_ms)) < 0)
err = -ETIME;
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_heci_cmd_submit.h
b/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_heci_cmd_submit.h
index 09d3fbdad05a..5ae5c5d9608b 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_heci_cmd_submit.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_heci_cmd_submit.h
@@ -12,6 +12,12 @@ struct i915_vma;
struct intel_context;
struct intel_gsc_uc;
+#define GSC_HECI_REPLY_LATENCY_MS 350
+/*
+ * Max FW response time is 350ms, but this should be counted from the time the
+ * command has hit the GSC-CS hardware, not the preceding handoff to GuC CTB.
+ */
+
struct intel_gsc_mtl_header {
u32 validity_marker;
#define GSC_HECI_VALIDITY_MARKER 0xA578875A
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h
b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h
index 298ad38e6c7d..a4f17b3ea286 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h
@@ -8,16 +8,19 @@
#include
+#include "gt/uc/intel_gsc_uc_heci_cmd_submit.h"
+
struct intel_pxp;
-#define GSC_REPLY_LATENCY_MS 210
+#define GSC_REPLY_LATENCY_MS GSC_HECI_REPLY_LATENCY_MS
/*
- * Max FW response time is 200ms, to which we add 10ms to account for overhead
- * such as request preparation, GuC submission to hw and pipeline completion
times.
+ * Max FW response time is 350ms, but this should be counted from the time the
+ * command has hit the GSC-CS hardware, not the preceding handoff to GuC CTB.
*/
#define GSC_PENDING_RETRY_MAXCOUNT 40
#define GSC_PENDING_RETRY_PAUSE_MS 50
-#define GSCFW_MAX_ROUND_TRIP_LATENCY_MS (GSC_PENDING_RETRY_MAXCOUNT *
GSC_PENDING_RETRY_PAUSE_MS)
+#define GSCFW_MAX_ROUND_TRIP_LATENCY_MS (GSC_REPLY_LATENCY_MS + \
+(GSC_PENDING_RETRY_MAXCOUNT *
GSC_PENDING_RETRY_PAUSE_MS))
#ifdef CONFIG_DRM_I915_PXP
void intel_pxp_gsccs_fini(struct intel_pxp *pxp);
Reviewed-by: Balasubrawmanian, Vivaik
