| Message ID | 20230909223848.427849-2-alan.previn.teres.alexis@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/i915/pxp/mtl: Update gsc-heci cmd submission to align with fw/hw spec | expand |
On Sat, 2023-09-09 at 15:38 -0700, Teres Alexis, 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 <alan.previn.teres.alexis@intel.com> > --- > .../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(-) alan: snip > 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. > + */ alan: continue to face timeout issues - so increasing this to ~500 to absorb other hw/sw system latencies. this also matches what the gsc-proxy code was doing - so i could use the same macro for that other code path.
On Sat, 2023-09-09 at 15:38 -0700, Teres Alexis, 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, alan:snip Vivaik replied with RB on dri-devel: https://lists.freedesktop.org/archives/dri-devel/2023-September/422861.html we connected offline and agreed that his RB can remain standing on condition i fix the PAGE_ALIGNED -> PAGE_ALIGN fix. Thanks Vivaik for reviewing.
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 <linux/types.h> +#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);
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 <alan.previn.teres.alexis@intel.com> --- .../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(-)