On 4/1/2021 9:28 AM, Aditya Swarup wrote:
The WA requires the following procedure for VDBox SFC reset:
If (MFX-SFC usage is 1) {
1.Issue a MFX-SFC forced lock
2.Wait for MFX-SFC forced lock ack
3.Check the MFX-SFC usage bit
If (MFX-SFC usage bit is 1)
Reset VDBOX and SFC
else
Reset VDBOX
Release the force lock MFX-SFC
}
else if(HCP+SFC usage is 1) {
1.Issue a VE-SFC forced lock
2.Wait for SFC forced lock ack
3.Check the VE-SFC usage bit
If (VE-SFC usage bit is 1)
Reset VDBOX
else
Reset VDBOX and SFC
Release the force lock VE-SFC.
}
else
Reset VDBOX
- Restructure: the changes to the original code flow should stay
relatively minimal; we only need to do an extra HCP check after the
usual VD-MFX check and, if true, switch the register/bit we're
performing the lock on.(MattR)
Bspec: 52890, 53509
Co-developed-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Cc: Matt Roper <matthew.d.roper@xxxxxxxxx>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Cc: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
Signed-off-by: Aditya Swarup <aditya.swarup@xxxxxxxxx>
Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_reset.c | 194 +++++++++++++++++---------
drivers/gpu/drm/i915/i915_reg.h | 6 +
2 files changed, 137 insertions(+), 63 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_reset.c b/drivers/gpu/drm/i915/gt/intel_reset.c
index a377c4588aaa..bcb3d864db11 100644
--- a/drivers/gpu/drm/i915/gt/intel_reset.c
+++ b/drivers/gpu/drm/i915/gt/intel_reset.c
@@ -338,15 +338,69 @@ static int gen6_reset_engines(struct intel_gt *gt,
return gen6_hw_domain_reset(gt, hw_mask);
}
-static int gen11_lock_sfc(struct intel_engine_cs *engine, u32 *hw_mask)
+static struct intel_engine_cs *find_sfc_paired_vecs_engine(struct intel_engine_cs *engine)
+{
+ int vecs_id;
+
+ GEM_BUG_ON(engine->class != VIDEO_DECODE_CLASS);
+
+ vecs_id = _VECS((engine->instance) / 2);
+
+ return engine->gt->engine[vecs_id];
+}
+
+struct sfc_lock_data {
+ i915_reg_t lock_reg;
+ i915_reg_t ack_reg;
+ i915_reg_t usage_reg;
+ u32 lock_bit;
+ u32 ack_bit;
+ u32 usage_bit;
+ u32 reset_bit;
+};
+
+static void get_sfc_forced_lock_data(struct intel_engine_cs *engine,
+ struct sfc_lock_data *sfc_lock)
+{
+ switch (engine->class) {
+ default:
+ MISSING_CASE(engine->class);
+ fallthrough;
+ case VIDEO_DECODE_CLASS:
+ sfc_lock->lock_reg = GEN11_VCS_SFC_FORCED_LOCK(engine);
+ sfc_lock->lock_bit = GEN11_VCS_SFC_FORCED_LOCK_BIT;
+
+ sfc_lock->ack_reg = GEN11_VCS_SFC_LOCK_STATUS(engine);
+ sfc_lock->ack_bit = GEN11_VCS_SFC_LOCK_ACK_BIT;
+
+ sfc_lock->usage_reg = GEN11_VCS_SFC_LOCK_STATUS(engine);
+ sfc_lock->usage_bit = GEN11_VCS_SFC_USAGE_BIT;
+ sfc_lock->reset_bit = GEN11_VCS_SFC_RESET_BIT(engine->instance);
+
+ break;
+ case VIDEO_ENHANCEMENT_CLASS:
+ sfc_lock->lock_reg = GEN11_VECS_SFC_FORCED_LOCK(engine);
+ sfc_lock->lock_bit = GEN11_VECS_SFC_FORCED_LOCK_BIT;
+
+ sfc_lock->ack_reg = GEN11_VECS_SFC_LOCK_ACK(engine);
+ sfc_lock->ack_bit = GEN11_VECS_SFC_LOCK_ACK_BIT;
+
+ sfc_lock->usage_reg = GEN11_VECS_SFC_USAGE(engine);
+ sfc_lock->usage_bit = GEN11_VECS_SFC_USAGE_BIT;
+ sfc_lock->reset_bit = GEN11_VECS_SFC_RESET_BIT(engine->instance);
+
+ break;
+ }
+}
+
+static int gen11_lock_sfc(struct intel_engine_cs *engine,
+ u32 *reset_mask,
+ u32 *unlock_mask)
{
struct intel_uncore *uncore = engine->uncore;
u8 vdbox_sfc_access = engine->gt->info.vdbox_sfc_access;
- i915_reg_t sfc_forced_lock, sfc_forced_lock_ack;
- u32 sfc_forced_lock_bit, sfc_forced_lock_ack_bit;
- i915_reg_t sfc_usage;
- u32 sfc_usage_bit;
- u32 sfc_reset_bit;
+ struct sfc_lock_data sfc_lock;
+ bool lock_obtained, lock_to_other = false;
int ret;
switch (engine->class) {
@@ -354,53 +408,72 @@ static int gen11_lock_sfc(struct intel_engine_cs *engine, u32 *hw_mask)
if ((BIT(engine->instance) & vdbox_sfc_access) == 0)
return 0;
- sfc_forced_lock = GEN11_VCS_SFC_FORCED_LOCK(engine);
- sfc_forced_lock_bit = GEN11_VCS_SFC_FORCED_LOCK_BIT;
-
- sfc_forced_lock_ack = GEN11_VCS_SFC_LOCK_STATUS(engine);
- sfc_forced_lock_ack_bit = GEN11_VCS_SFC_LOCK_ACK_BIT;
+ fallthrough;
+ case VIDEO_ENHANCEMENT_CLASS:
+ get_sfc_forced_lock_data(engine, &sfc_lock);
- sfc_usage = GEN11_VCS_SFC_LOCK_STATUS(engine);
- sfc_usage_bit = GEN11_VCS_SFC_USAGE_BIT;
- sfc_reset_bit = GEN11_VCS_SFC_RESET_BIT(engine->instance);
break;
+ default:
+ return 0;
+ }
- case VIDEO_ENHANCEMENT_CLASS:
- sfc_forced_lock = GEN11_VECS_SFC_FORCED_LOCK(engine);
- sfc_forced_lock_bit = GEN11_VECS_SFC_FORCED_LOCK_BIT;
+ if (!(intel_uncore_read_fw(uncore, sfc_lock.usage_reg) & sfc_lock.usage_bit)) {
+ struct intel_engine_cs *paired_vecs;
- sfc_forced_lock_ack = GEN11_VECS_SFC_LOCK_ACK(engine);
- sfc_forced_lock_ack_bit = GEN11_VECS_SFC_LOCK_ACK_BIT;
+ if (engine->class != VIDEO_DECODE_CLASS ||
+ !IS_GEN(engine->i915, 12))
+ return 0;
- sfc_usage = GEN11_VECS_SFC_USAGE(engine);
- sfc_usage_bit = GEN11_VECS_SFC_USAGE_BIT;
- sfc_reset_bit = GEN11_VECS_SFC_RESET_BIT(engine->instance);
- break;
+ /*
+ * Wa_14010733141
+ *
+ * If the VCS-MFX isn't using the SFC, we also need to check
+ * whether VCS-HCP is using it. If so, we need to issue a *VE*
+ * forced lock on the VE engine that shares the same SFC.
+ */
+ if (!(intel_uncore_read_fw(uncore,
+ GEN12_HCP_SFC_LOCK_STATUS(engine)) &
+ GEN12_HCP_SFC_USAGE_BIT))
+ return 0;
- default:
- return 0;
+ paired_vecs = find_sfc_paired_vecs_engine(engine);
+ get_sfc_forced_lock_data(paired_vecs, &sfc_lock);
+ lock_to_other = true;
+ *unlock_mask |= BIT(paired_vecs->id);
nit: could use paired_vecs->engine_mask directly here instead of BIT(...)
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Daniele
+ } else {
+ *unlock_mask |= engine->mask;
}
/*
- * If the engine is using a SFC, tell the engine that a software reset
+ * If the engine is using an SFC, tell the engine that a software reset
* is going to happen. The engine will then try to force lock the SFC.
* If SFC ends up being locked to the engine we want to reset, we have
* to reset it as well (we will unlock it once the reset sequence is
* completed).
*/
- if (!(intel_uncore_read_fw(uncore, sfc_usage) & sfc_usage_bit))
- return 0;
-
- rmw_set_fw(uncore, sfc_forced_lock, sfc_forced_lock_bit);
+ rmw_set_fw(uncore, sfc_lock.lock_reg, sfc_lock.lock_bit);
ret = __intel_wait_for_register_fw(uncore,
- sfc_forced_lock_ack,
- sfc_forced_lock_ack_bit,
- sfc_forced_lock_ack_bit,
+ sfc_lock.ack_reg,
+ sfc_lock.ack_bit,
+ sfc_lock.ack_bit,
1000, 0, NULL);
- /* Was the SFC released while we were trying to lock it? */
- if (!(intel_uncore_read_fw(uncore, sfc_usage) & sfc_usage_bit))
+ /*
+ * Was the SFC released while we were trying to lock it?
+ *
+ * We should reset both the engine and the SFC if:
+ * - We were locking the SFC to this engine and the lock succeeded
+ * OR
+ * - We were locking the SFC to a different engine (Wa_14010733141)
+ * but the SFC was released before the lock was obtained.
+ *
+ * Otherwise we need only reset the engine by itself and we can
+ * leave the SFC alone.
+ */
+ lock_obtained = (intel_uncore_read_fw(uncore, sfc_lock.usage_reg) &
+ sfc_lock.usage_bit) != 0;
+ if (lock_obtained == lock_to_other)
return 0;
if (ret) {
@@ -408,7 +481,7 @@ static int gen11_lock_sfc(struct intel_engine_cs *engine, u32 *hw_mask)
return ret;
}
- *hw_mask |= sfc_reset_bit;
+ *reset_mask |= sfc_lock.reset_bit;
return 0;
}
@@ -416,28 +489,19 @@ static void gen11_unlock_sfc(struct intel_engine_cs *engine)
{
struct intel_uncore *uncore = engine->uncore;
u8 vdbox_sfc_access = engine->gt->info.vdbox_sfc_access;
- i915_reg_t sfc_forced_lock;
- u32 sfc_forced_lock_bit;
-
- switch (engine->class) {
- case VIDEO_DECODE_CLASS:
- if ((BIT(engine->instance) & vdbox_sfc_access) == 0)
- return;
-
- sfc_forced_lock = GEN11_VCS_SFC_FORCED_LOCK(engine);
- sfc_forced_lock_bit = GEN11_VCS_SFC_FORCED_LOCK_BIT;
- break;
+ struct sfc_lock_data sfc_lock = {};
- case VIDEO_ENHANCEMENT_CLASS:
- sfc_forced_lock = GEN11_VECS_SFC_FORCED_LOCK(engine);
- sfc_forced_lock_bit = GEN11_VECS_SFC_FORCED_LOCK_BIT;
- break;
+ if (engine->class != VIDEO_DECODE_CLASS &&
+ engine->class != VIDEO_ENHANCEMENT_CLASS)
+ return;
- default:
+ if (engine->class == VIDEO_DECODE_CLASS &&
+ (BIT(engine->instance) & vdbox_sfc_access) == 0)
return;
- }
- rmw_clear_fw(uncore, sfc_forced_lock, sfc_forced_lock_bit);
+ get_sfc_forced_lock_data(engine, &sfc_lock);
+
+ rmw_clear_fw(uncore, sfc_lock.lock_reg, sfc_lock.lock_bit);
}
static int gen11_reset_engines(struct intel_gt *gt,
@@ -456,23 +520,23 @@ static int gen11_reset_engines(struct intel_gt *gt,
};
struct intel_engine_cs *engine;
intel_engine_mask_t tmp;
- u32 hw_mask;
+ u32 reset_mask, unlock_mask = 0;
int ret;
if (engine_mask == ALL_ENGINES) {
- hw_mask = GEN11_GRDOM_FULL;
+ reset_mask = GEN11_GRDOM_FULL;
} else {
- hw_mask = 0;
+ reset_mask = 0;
for_each_engine_masked(engine, gt, engine_mask, tmp) {
GEM_BUG_ON(engine->id >= ARRAY_SIZE(hw_engine_mask));
- hw_mask |= hw_engine_mask[engine->id];
- ret = gen11_lock_sfc(engine, &hw_mask);
+ reset_mask |= hw_engine_mask[engine->id];
+ ret = gen11_lock_sfc(engine, &reset_mask, &unlock_mask);
if (ret)
goto sfc_unlock;
}
}
- ret = gen6_hw_domain_reset(gt, hw_mask);
+ ret = gen6_hw_domain_reset(gt, reset_mask);
sfc_unlock:
/*
@@ -480,10 +544,14 @@ static int gen11_reset_engines(struct intel_gt *gt,
* gen11_lock_sfc to make sure that we clean properly if something
* wrong happened during the lock (e.g. lock acquired after timeout
* expiration).
+ *
+ * Due to Wa_14010733141, we may have locked an SFC to an engine that
+ * wasn't being reset. So instead of calling gen11_unlock_sfc()
+ * on engine_mask, we instead call it on the mask of engines that our
+ * gen11_lock_sfc() calls told us actually had locks attempted.
*/
- if (engine_mask != ALL_ENGINES)
- for_each_engine_masked(engine, gt, engine_mask, tmp)
- gen11_unlock_sfc(engine);
+ for_each_engine_masked(engine, gt, unlock_mask, tmp)
+ gen11_unlock_sfc(engine);
return ret;
}
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index cbf7a60afe54..f265733979ed 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -416,6 +416,12 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
#define GEN11_VECS_SFC_USAGE(engine) _MMIO((engine)->mmio_base + 0x2014)
#define GEN11_VECS_SFC_USAGE_BIT (1 << 0)
+#define GEN12_HCP_SFC_FORCED_LOCK(engine) _MMIO((engine)->mmio_base + 0x2910)
+#define GEN12_HCP_SFC_FORCED_LOCK_BIT REG_BIT(0)
+#define GEN12_HCP_SFC_LOCK_STATUS(engine) _MMIO((engine)->mmio_base + 0x2914)
+#define GEN12_HCP_SFC_LOCK_ACK_BIT REG_BIT(1)
+#define GEN12_HCP_SFC_USAGE_BIT REG_BIT(0)
+
#define GEN12_SFC_DONE(n) _MMIO(0x1cc00 + (n) * 0x100)
#define GEN12_SFC_DONE_MAX 4
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