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Message-Id: <ccc54757d89d38af35e5c5885edfb980c7b227f6.1656921701.git.mchehab@kernel.org>
Date: Mon, 4 Jul 2022 16:20:03 +0100
From: Mauro Carvalho Chehab <mchehab@...nel.org>
To: unlisted-recipients:; (no To-header on input)
Cc: Thomas Hellström
<thomas.hellstrom@...ux.intel.com>,
Chris Wilson <chris@...is-wilson.co.uk>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Mika Kuoppala <mika.kuoppala@...ux.intel.com>,
Thomas Hellstrom <thomas.hellstrom@...el.com>,
Chris Wilson <chris.p.wilson@...el.com>,
Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
Andi Shyti <andi.shyti@...ux.intel.com>,
Bruce Chang <yu.bruce.chang@...el.com>,
Daniel Vetter <daniel@...ll.ch>,
David Airlie <airlied@...ux.ie>,
Jani Nikula <jani.nikula@...ux.intel.com>,
John Harrison <John.C.Harrison@...el.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Lucas De Marchi <lucas.demarchi@...el.com>,
Matt Roper <matthew.d.roper@...el.com>,
Matthew Brost <matthew.brost@...el.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@...el.com>,
Umesh Nerlige Ramappa <umesh.nerlige.ramappa@...el.com>,
dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, stable@...r.kernel.org,
Andi Shyti <andi.shyti@...el.com>
Subject: [PATCH v3 1/2] drm/i915/gt: Serialize GRDOM access between multiple engine resets
From: Chris Wilson <chris.p.wilson@...el.com>
Don't allow two engines to be reset in parallel, as they would both
try to select a reset bit (and send requests to common registers)
and wait on that register, at the same time. Serialize control of
the reset requests/acks using the uncore->lock, which will also ensure
that no other GT state changes at the same time as the actual reset.
Cc: stable@...r.kernel.org # Up to 4.4
Reported-by: Mika Kuoppala <mika.kuoppala@...ux.intel.com>
Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@...ux.intel.com>
Reviewed-by: Andi Shyti <andi.shyti@...el.com>
Acked-by: Thomas Hellström <thomas.hellstrom@...ux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...nel.org>
---
To avoid mailbombing on a large number of people, only mailing lists were C/C on the cover.
See [PATCH v3 0/2] at: https://lore.kernel.org/all/cover.1656921701.git.mchehab@kernel.org/
drivers/gpu/drm/i915/gt/intel_reset.c | 37 ++++++++++++++++++++-------
1 file changed, 28 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_reset.c b/drivers/gpu/drm/i915/gt/intel_reset.c
index a5338c3fde7a..c68d36fb5bbd 100644
--- a/drivers/gpu/drm/i915/gt/intel_reset.c
+++ b/drivers/gpu/drm/i915/gt/intel_reset.c
@@ -300,9 +300,9 @@ static int gen6_hw_domain_reset(struct intel_gt *gt, u32 hw_domain_mask)
return err;
}
-static int gen6_reset_engines(struct intel_gt *gt,
- intel_engine_mask_t engine_mask,
- unsigned int retry)
+static int __gen6_reset_engines(struct intel_gt *gt,
+ intel_engine_mask_t engine_mask,
+ unsigned int retry)
{
struct intel_engine_cs *engine;
u32 hw_mask;
@@ -321,6 +321,20 @@ static int gen6_reset_engines(struct intel_gt *gt,
return gen6_hw_domain_reset(gt, hw_mask);
}
+static int gen6_reset_engines(struct intel_gt *gt,
+ intel_engine_mask_t engine_mask,
+ unsigned int retry)
+{
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(>->uncore->lock, flags);
+ ret = __gen6_reset_engines(gt, engine_mask, retry);
+ spin_unlock_irqrestore(>->uncore->lock, flags);
+
+ return ret;
+}
+
static struct intel_engine_cs *find_sfc_paired_vecs_engine(struct intel_engine_cs *engine)
{
int vecs_id;
@@ -487,9 +501,9 @@ static void gen11_unlock_sfc(struct intel_engine_cs *engine)
rmw_clear_fw(uncore, sfc_lock.lock_reg, sfc_lock.lock_bit);
}
-static int gen11_reset_engines(struct intel_gt *gt,
- intel_engine_mask_t engine_mask,
- unsigned int retry)
+static int __gen11_reset_engines(struct intel_gt *gt,
+ intel_engine_mask_t engine_mask,
+ unsigned int retry)
{
struct intel_engine_cs *engine;
intel_engine_mask_t tmp;
@@ -583,8 +597,11 @@ static int gen8_reset_engines(struct intel_gt *gt,
struct intel_engine_cs *engine;
const bool reset_non_ready = retry >= 1;
intel_engine_mask_t tmp;
+ unsigned long flags;
int ret;
+ spin_lock_irqsave(>->uncore->lock, flags);
+
for_each_engine_masked(engine, gt, engine_mask, tmp) {
ret = gen8_engine_reset_prepare(engine);
if (ret && !reset_non_ready)
@@ -612,17 +629,19 @@ static int gen8_reset_engines(struct intel_gt *gt,
* This is best effort, so ignore any error from the initial reset.
*/
if (IS_DG2(gt->i915) && engine_mask == ALL_ENGINES)
- gen11_reset_engines(gt, gt->info.engine_mask, 0);
+ __gen11_reset_engines(gt, gt->info.engine_mask, 0);
if (GRAPHICS_VER(gt->i915) >= 11)
- ret = gen11_reset_engines(gt, engine_mask, retry);
+ ret = __gen11_reset_engines(gt, engine_mask, retry);
else
- ret = gen6_reset_engines(gt, engine_mask, retry);
+ ret = __gen6_reset_engines(gt, engine_mask, retry);
skip_reset:
for_each_engine_masked(engine, gt, engine_mask, tmp)
gen8_engine_reset_cancel(engine);
+ spin_unlock_irqrestore(>->uncore->lock, flags);
+
return ret;
}
--
2.36.1
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