From b61b8fef2c67d981489f0d6e25b1d8b842696ba7 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Tue, 5 May 2020 09:46:29 +0100
Subject: drm/i915/execlists: Record the active CCID from before reset
Git-commit: b68be5c623cdd62b9a8b99eb1443ba9cba812d6d
Patch-mainline: v5.8-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322
If we cannot trust the reset will flush out the CS event queue such that
process_csb() reports an accurate view of HW, we will need to search the
active and pending contexts to determine which was actually running at
the time we issued the reset.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200505084629.31365-1-chris@chris-wilson.co.uk
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/i915/gt/intel_engine_types.h | 5 +++++
drivers/gpu/drm/i915/gt/intel_lrc.c | 4 +++-
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h b/drivers/gpu/drm/i915/gt/intel_engine_types.h
index 6c676774dcd9..b1048f039552 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
@@ -179,6 +179,11 @@ struct intel_engine_execlists {
*/
u32 error_interrupt;
+ /**
+ * @reset_ccid: Active CCID [EXECLISTS_STATUS_HI] at the time of reset
+ */
+ u32 reset_ccid;
+
/**
* @no_priolist: priority lists disabled
*/
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index dc84cf60b38e..2e2cbd4de71a 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -4077,6 +4077,8 @@ static void execlists_reset_prepare(struct intel_engine_cs *engine)
*/
ring_set_paused(engine, 1);
intel_engine_stop_cs(engine);
+
+ engine->execlists.reset_ccid = active_ccid(engine);
}
static void __reset_stop_ring(u32 *regs, const struct intel_engine_cs *engine)
@@ -4119,7 +4121,7 @@ static void __execlists_reset(struct intel_engine_cs *engine, bool stalled)
* its request, it was still running at the time of the
* reset and will have been clobbered.
*/
- rq = execlists_active(execlists);
+ rq = active_context(engine, engine->execlists.reset_ccid);
if (!rq)
goto unwind;
--
2.28.0