drm/i915/mtl: Use primary GT's irq lock for media GT

When we hook up interrupts (in the next patch), interrupts for the media
GT are still processed as part of the primary GT's interrupt flow.  As
such, we should share the same IRQ lock with the primary GT.  Let's
convert gt->irq_lock into a pointer and just point the media GT's
instance at the same lock the primary GT is using.

v2:
 - Point media's gt->irq_lock at the primary GT lock properly.  (Daniele)
 - Fix jump target for intel_root_gt_init_early errors.  (Daniele)

Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220906234934.3655440-14-matthew.d.roper@intel.com
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

11 files changed, 61 insertions, 49 deletions

diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index 41acc285e8bf..6e0122b3dca2 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -1688,9 +1688,9 @@ bool intel_engine_irq_enable(struct intel_engine_cs *engine)
 		return false;
 
 	/* Caller disables interrupts */
-	spin_lock(&engine->gt->irq_lock);
+	spin_lock(engine->gt->irq_lock);
 	engine->irq_enable(engine);
-	spin_unlock(&engine->gt->irq_lock);
+	spin_unlock(engine->gt->irq_lock);
 
 	return true;
 }
@@ -1701,9 +1701,9 @@ void intel_engine_irq_disable(struct intel_engine_cs *engine)
 		return;
 
 	/* Caller disables interrupts */
-	spin_lock(&engine->gt->irq_lock);
+	spin_lock(engine->gt->irq_lock);
 	engine->irq_disable(engine);
-	spin_unlock(&engine->gt->irq_lock);
+	spin_unlock(engine->gt->irq_lock);
 }
 
 void intel_engines_reset_default_submission(struct intel_gt *gt)
diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index 2189ea1d302e..b079af8fc574 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -37,7 +37,7 @@
 
 void intel_gt_common_init_early(struct intel_gt *gt)
 {
-	spin_lock_init(&gt->irq_lock);
+	spin_lock_init(gt->irq_lock);
 
 	INIT_LIST_HEAD(&gt->closed_vma);
 	spin_lock_init(&gt->closed_lock);
@@ -58,14 +58,19 @@ void intel_gt_common_init_early(struct intel_gt *gt)
 }
 
 /* Preliminary initialization of Tile 0 */
-void intel_root_gt_init_early(struct drm_i915_private *i915)
+int intel_root_gt_init_early(struct drm_i915_private *i915)
 {
 	struct intel_gt *gt = to_gt(i915);
 
 	gt->i915 = i915;
 	gt->uncore = &i915->uncore;
+	gt->irq_lock = drmm_kzalloc(&i915->drm, sizeof(*gt->irq_lock), GFP_KERNEL);
+	if (!gt->irq_lock)
+		return -ENOMEM;
 
 	intel_gt_common_init_early(gt);
+
+	return 0;
 }
 
 static int intel_gt_probe_lmem(struct intel_gt *gt)
@@ -782,12 +787,18 @@ static int intel_gt_tile_setup(struct intel_gt *gt, phys_addr_t phys_addr)
 
 	if (!gt_is_root(gt)) {
 		struct intel_uncore *uncore;
+		spinlock_t *irq_lock;
 
 		uncore = drmm_kzalloc(&gt->i915->drm, sizeof(*uncore), GFP_KERNEL);
 		if (!uncore)
 			return -ENOMEM;
 
+		irq_lock = drmm_kzalloc(&gt->i915->drm, sizeof(*irq_lock), GFP_KERNEL);
+		if (!irq_lock)
+			return -ENOMEM;
+
 		gt->uncore = uncore;
+		gt->irq_lock = irq_lock;
 
 		intel_gt_common_init_early(gt);
 	}
diff --git a/drivers/gpu/drm/i915/gt/intel_gt.h b/drivers/gpu/drm/i915/gt/intel_gt.h
index c9a359f35d0f..2ee582e287c8 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt.h
@@ -45,7 +45,7 @@ static inline struct intel_gt *gsc_to_gt(struct intel_gsc *gsc)
 }
 
 void intel_gt_common_init_early(struct intel_gt *gt);
-void intel_root_gt_init_early(struct drm_i915_private *i915);
+int intel_root_gt_init_early(struct drm_i915_private *i915);
 int intel_gt_assign_ggtt(struct intel_gt *gt);
 int intel_gt_init_mmio(struct intel_gt *gt);
 int __must_check intel_gt_init_hw(struct intel_gt *gt);
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_irq.c b/drivers/gpu/drm/i915/gt/intel_gt_irq.c
index 3a72d4fd0214..0dfd0c42d00d 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_irq.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_irq.c
@@ -29,7 +29,7 @@ gen11_gt_engine_identity(struct intel_gt *gt,
 	u32 timeout_ts;
 	u32 ident;
 
-	lockdep_assert_held(&gt->irq_lock);
+	lockdep_assert_held(gt->irq_lock);
 
 	raw_reg_write(regs, GEN11_IIR_REG_SELECTOR(bank), BIT(bit));
 
@@ -120,7 +120,7 @@ gen11_gt_bank_handler(struct intel_gt *gt, const unsigned int bank)
 	unsigned long intr_dw;
 	unsigned int bit;
 
-	lockdep_assert_held(&gt->irq_lock);
+	lockdep_assert_held(gt->irq_lock);
 
 	intr_dw = raw_reg_read(regs, GEN11_GT_INTR_DW(bank));
 
@@ -138,14 +138,14 @@ void gen11_gt_irq_handler(struct intel_gt *gt, const u32 master_ctl)
 {
 	unsigned int bank;
 
-	spin_lock(&gt->irq_lock);
+	spin_lock(gt->irq_lock);
 
 	for (bank = 0; bank < 2; bank++) {
 		if (master_ctl & GEN11_GT_DW_IRQ(bank))
 			gen11_gt_bank_handler(gt, bank);
 	}
 
-	spin_unlock(&gt->irq_lock);
+	spin_unlock(gt->irq_lock);
 }
 
 bool gen11_gt_reset_one_iir(struct intel_gt *gt,
@@ -154,7 +154,7 @@ bool gen11_gt_reset_one_iir(struct intel_gt *gt,
 	void __iomem * const regs = gt->uncore->regs;
 	u32 dw;
 
-	lockdep_assert_held(&gt->irq_lock);
+	lockdep_assert_held(gt->irq_lock);
 
 	dw = raw_reg_read(regs, GEN11_GT_INTR_DW(bank));
 	if (dw & BIT(bit)) {
@@ -310,9 +310,9 @@ static void gen7_parity_error_irq_handler(struct intel_gt *gt, u32 iir)
 	if (!HAS_L3_DPF(gt->i915))
 		return;
 
-	spin_lock(&gt->irq_lock);
+	spin_lock(gt->irq_lock);
 	gen5_gt_disable_irq(gt, GT_PARITY_ERROR(gt->i915));
-	spin_unlock(&gt->irq_lock);
+	spin_unlock(gt->irq_lock);
 
 	if (iir & GT_RENDER_L3_PARITY_ERROR_INTERRUPT_S1)
 		gt->i915->l3_parity.which_slice |= 1 << 1;
@@ -434,7 +434,7 @@ static void gen5_gt_update_irq(struct intel_gt *gt,
 			       u32 interrupt_mask,
 			       u32 enabled_irq_mask)
 {
-	lockdep_assert_held(&gt->irq_lock);
+	lockdep_assert_held(gt->irq_lock);
 
 	GEM_BUG_ON(enabled_irq_mask & ~interrupt_mask);
 
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm_irq.c b/drivers/gpu/drm/i915/gt/intel_gt_pm_irq.c
index 11060f5a4c89..52f2a28b2058 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm_irq.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm_irq.c
@@ -37,7 +37,7 @@ static void gen6_gt_pm_update_irq(struct intel_gt *gt,
 
 	WARN_ON(enabled_irq_mask & ~interrupt_mask);
 
-	lockdep_assert_held(&gt->irq_lock);
+	lockdep_assert_held(gt->irq_lock);
 
 	new_val = gt->pm_imr;
 	new_val &= ~interrupt_mask;
@@ -64,7 +64,7 @@ void gen6_gt_pm_reset_iir(struct intel_gt *gt, u32 reset_mask)
 	struct intel_uncore *uncore = gt->uncore;
 	i915_reg_t reg = GRAPHICS_VER(gt->i915) >= 8 ? GEN8_GT_IIR(2) : GEN6_PMIIR;
 
-	lockdep_assert_held(&gt->irq_lock);
+	lockdep_assert_held(gt->irq_lock);
 
 	intel_uncore_write(uncore, reg, reset_mask);
 	intel_uncore_write(uncore, reg, reset_mask);
@@ -92,7 +92,7 @@ static void write_pm_ier(struct intel_gt *gt)
 
 void gen6_gt_pm_enable_irq(struct intel_gt *gt, u32 enable_mask)
 {
-	lockdep_assert_held(&gt->irq_lock);
+	lockdep_assert_held(gt->irq_lock);
 
 	gt->pm_ier |= enable_mask;
 	write_pm_ier(gt);
@@ -101,7 +101,7 @@ void gen6_gt_pm_enable_irq(struct intel_gt *gt, u32 enable_mask)
 
 void gen6_gt_pm_disable_irq(struct intel_gt *gt, u32 disable_mask)
 {
-	lockdep_assert_held(&gt->irq_lock);
+	lockdep_assert_held(gt->irq_lock);
 
 	gt->pm_ier &= ~disable_mask;
 	gen6_gt_pm_mask_irq(gt, disable_mask);
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_types.h b/drivers/gpu/drm/i915/gt/intel_gt_types.h
index 726695936a79..184ee9b11a4d 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_types.h
@@ -163,7 +163,7 @@ struct intel_gt {
 	struct intel_rc6 rc6;
 	struct intel_rps rps;
 
-	spinlock_t irq_lock;
+	spinlock_t *irq_lock;
 	u32 gt_imr;
 	u32 pm_ier;
 	u32 pm_imr;
diff --git a/drivers/gpu/drm/i915/gt/intel_rps.c b/drivers/gpu/drm/i915/gt/intel_rps.c
index 6fadde4ee7bf..6b86250c31ab 100644
--- a/drivers/gpu/drm/i915/gt/intel_rps.c
+++ b/drivers/gpu/drm/i915/gt/intel_rps.c
@@ -194,9 +194,9 @@ static void rps_enable_interrupts(struct intel_rps *rps)
 
 	rps_reset_ei(rps);
 
-	spin_lock_irq(&gt->irq_lock);
+	spin_lock_irq(gt->irq_lock);
 	gen6_gt_pm_enable_irq(gt, rps->pm_events);
-	spin_unlock_irq(&gt->irq_lock);
+	spin_unlock_irq(gt->irq_lock);
 
 	intel_uncore_write(gt->uncore,
 			   GEN6_PMINTRMSK, rps_pm_mask(rps, rps->last_freq));
@@ -217,14 +217,14 @@ static void rps_reset_interrupts(struct intel_rps *rps)
 {
 	struct intel_gt *gt = rps_to_gt(rps);
 
-	spin_lock_irq(&gt->irq_lock);
+	spin_lock_irq(gt->irq_lock);
 	if (GRAPHICS_VER(gt->i915) >= 11)
 		gen11_rps_reset_interrupts(rps);
 	else
 		gen6_rps_reset_interrupts(rps);
 
 	rps->pm_iir = 0;
-	spin_unlock_irq(&gt->irq_lock);
+	spin_unlock_irq(gt->irq_lock);
 }
 
 static void rps_disable_interrupts(struct intel_rps *rps)
@@ -234,9 +234,9 @@ static void rps_disable_interrupts(struct intel_rps *rps)
 	intel_uncore_write(gt->uncore,
 			   GEN6_PMINTRMSK, rps_pm_sanitize_mask(rps, ~0u));
 
-	spin_lock_irq(&gt->irq_lock);
+	spin_lock_irq(gt->irq_lock);
 	gen6_gt_pm_disable_irq(gt, GEN6_PM_RPS_EVENTS);
-	spin_unlock_irq(&gt->irq_lock);
+	spin_unlock_irq(gt->irq_lock);
 
 	intel_synchronize_irq(gt->i915);
 
@@ -1797,10 +1797,10 @@ static void rps_work(struct work_struct *work)
 	int new_freq, adj, min, max;
 	u32 pm_iir = 0;
 
-	spin_lock_irq(&gt->irq_lock);
+	spin_lock_irq(gt->irq_lock);
 	pm_iir = fetch_and_zero(&rps->pm_iir) & rps->pm_events;
 	client_boost = atomic_read(&rps->num_waiters);
-	spin_unlock_irq(&gt->irq_lock);
+	spin_unlock_irq(gt->irq_lock);
 
 	/* Make sure we didn't queue anything we're not going to process. */
 	if (!pm_iir && !client_boost)
@@ -1873,9 +1873,9 @@ static void rps_work(struct work_struct *work)
 	mutex_unlock(&rps->lock);
 
 out:
-	spin_lock_irq(&gt->irq_lock);
+	spin_lock_irq(gt->irq_lock);
 	gen6_gt_pm_unmask_irq(gt, rps->pm_events);
-	spin_unlock_irq(&gt->irq_lock);
+	spin_unlock_irq(gt->irq_lock);
 }
 
 void gen11_rps_irq_handler(struct intel_rps *rps, u32 pm_iir)
@@ -1883,7 +1883,7 @@ void gen11_rps_irq_handler(struct intel_rps *rps, u32 pm_iir)
 	struct intel_gt *gt = rps_to_gt(rps);
 	const u32 events = rps->pm_events & pm_iir;
 
-	lockdep_assert_held(&gt->irq_lock);
+	lockdep_assert_held(gt->irq_lock);
 
 	if (unlikely(!events))
 		return;
@@ -1903,7 +1903,7 @@ void gen6_rps_irq_handler(struct intel_rps *rps, u32 pm_iir)
 
 	events = pm_iir & rps->pm_events;
 	if (events) {
-		spin_lock(&gt->irq_lock);
+		spin_lock(gt->irq_lock);
 
 		GT_TRACE(gt, "irq events:%x\n", events);
 
@@ -1911,7 +1911,7 @@ void gen6_rps_irq_handler(struct intel_rps *rps, u32 pm_iir)
 		rps->pm_iir |= events;
 
 		schedule_work(&rps->work);
-		spin_unlock(&gt->irq_lock);
+		spin_unlock(gt->irq_lock);
 	}
 
 	if (GRAPHICS_VER(gt->i915) >= 8)
diff --git a/drivers/gpu/drm/i915/gt/intel_sa_media.c b/drivers/gpu/drm/i915/gt/intel_sa_media.c
index 8c5c519457cc..5516e9c363a4 100644
--- a/drivers/gpu/drm/i915/gt/intel_sa_media.c
+++ b/drivers/gpu/drm/i915/gt/intel_sa_media.c
@@ -21,6 +21,7 @@ int intel_sa_mediagt_setup(struct intel_gt *gt, phys_addr_t phys_addr,
 
 	uncore->gsi_offset = gsi_offset;
 
+	gt->irq_lock = to_gt(i915)->irq_lock;
 	intel_gt_common_init_early(gt);
 	intel_uncore_init_early(uncore, gt);
 
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.c b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
index 24451d000a6a..bac06e3d6f2c 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
@@ -82,9 +82,9 @@ static void gen9_reset_guc_interrupts(struct intel_guc *guc)
 
 	assert_rpm_wakelock_held(&gt->i915->runtime_pm);
 
-	spin_lock_irq(&gt->irq_lock);
+	spin_lock_irq(gt->irq_lock);
 	gen6_gt_pm_reset_iir(gt, gt->pm_guc_events);
-	spin_unlock_irq(&gt->irq_lock);
+	spin_unlock_irq(gt->irq_lock);
 }
 
 static void gen9_enable_guc_interrupts(struct intel_guc *guc)
@@ -93,11 +93,11 @@ static void gen9_enable_guc_interrupts(struct intel_guc *guc)
 
 	assert_rpm_wakelock_held(&gt->i915->runtime_pm);
 
-	spin_lock_irq(&gt->irq_lock);
+	spin_lock_irq(gt->irq_lock);
 	WARN_ON_ONCE(intel_uncore_read(gt->uncore, GEN8_GT_IIR(2)) &
 		     gt->pm_guc_events);
 	gen6_gt_pm_enable_irq(gt, gt->pm_guc_events);
-	spin_unlock_irq(&gt->irq_lock);
+	spin_unlock_irq(gt->irq_lock);
 }
 
 static void gen9_disable_guc_interrupts(struct intel_guc *guc)
@@ -106,11 +106,11 @@ static void gen9_disable_guc_interrupts(struct intel_guc *guc)
 
 	assert_rpm_wakelock_held(&gt->i915->runtime_pm);
 
-	spin_lock_irq(&gt->irq_lock);
+	spin_lock_irq(gt->irq_lock);
 
 	gen6_gt_pm_disable_irq(gt, gt->pm_guc_events);
 
-	spin_unlock_irq(&gt->irq_lock);
+	spin_unlock_irq(gt->irq_lock);
 	intel_synchronize_irq(gt->i915);
 
 	gen9_reset_guc_interrupts(guc);
@@ -120,9 +120,9 @@ static void gen11_reset_guc_interrupts(struct intel_guc *guc)
 {
 	struct intel_gt *gt = guc_to_gt(guc);
 
-	spin_lock_irq(&gt->irq_lock);
+	spin_lock_irq(gt->irq_lock);
 	gen11_gt_reset_one_iir(gt, 0, GEN11_GUC);
-	spin_unlock_irq(&gt->irq_lock);
+	spin_unlock_irq(gt->irq_lock);
 }
 
 static void gen11_enable_guc_interrupts(struct intel_guc *guc)
@@ -130,25 +130,25 @@ static void gen11_enable_guc_interrupts(struct intel_guc *guc)
 	struct intel_gt *gt = guc_to_gt(guc);
 	u32 events = REG_FIELD_PREP(ENGINE1_MASK, GUC_INTR_GUC2HOST);
 
-	spin_lock_irq(&gt->irq_lock);
+	spin_lock_irq(gt->irq_lock);
 	WARN_ON_ONCE(gen11_gt_reset_one_iir(gt, 0, GEN11_GUC));
 	intel_uncore_write(gt->uncore,
 			   GEN11_GUC_SG_INTR_ENABLE, events);
 	intel_uncore_write(gt->uncore,
 			   GEN11_GUC_SG_INTR_MASK, ~events);
-	spin_unlock_irq(&gt->irq_lock);
+	spin_unlock_irq(gt->irq_lock);
 }
 
 static void gen11_disable_guc_interrupts(struct intel_guc *guc)
 {
 	struct intel_gt *gt = guc_to_gt(guc);
 
-	spin_lock_irq(&gt->irq_lock);
+	spin_lock_irq(gt->irq_lock);
 
 	intel_uncore_write(gt->uncore, GEN11_GUC_SG_INTR_MASK, ~0);
 	intel_uncore_write(gt->uncore, GEN11_GUC_SG_INTR_ENABLE, 0);
 
-	spin_unlock_irq(&gt->irq_lock);
+	spin_unlock_irq(gt->irq_lock);
 	intel_synchronize_irq(gt->i915);
 
 	gen11_reset_guc_interrupts(guc);
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index 707c2253e96a..22ba66e48a9b 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -1537,8 +1537,8 @@ void intel_guc_submission_reset_prepare(struct intel_guc *guc)
 	__reset_guc_busyness_stats(guc);
 
 	/* Flush IRQ handler */
-	spin_lock_irq(&guc_to_gt(guc)->irq_lock);
-	spin_unlock_irq(&guc_to_gt(guc)->irq_lock);
+	spin_lock_irq(guc_to_gt(guc)->irq_lock);
+	spin_unlock_irq(guc_to_gt(guc)->irq_lock);
 
 	guc_flush_submissions(guc);
 	guc_flush_destroyed_contexts(guc);
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc.c b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
index abf4e142596d..dbd048b77e19 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
@@ -245,9 +245,9 @@ static int guc_enable_communication(struct intel_guc *guc)
 	intel_guc_enable_interrupts(guc);
 
 	/* check for CT messages received before we enabled interrupts */
-	spin_lock_irq(&gt->irq_lock);
+	spin_lock_irq(gt->irq_lock);
 	intel_guc_ct_event_handler(&guc->ct);
-	spin_unlock_irq(&gt->irq_lock);
+	spin_unlock_irq(gt->irq_lock);
 
 	drm_dbg(&i915->drm, "GuC communication enabled\n");