linux-kernel - [PATCH v2 4/8] irqchip/apple-aic: Wire PMU interrupts

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Message-Id: <20211201134909.390490-5-maz@kernel.org>
Date:   Wed,  1 Dec 2021 13:49:05 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Mark Rutland <mark.rutland@....com>, Will Deacon <will@...nel.org>,
        Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dougall <dougallj@...il.com>, kernel-team@...roid.com
Subject: [PATCH v2 4/8] irqchip/apple-aic: Wire PMU interrupts

Add the necessary code to configure and P and E-core PMU interrupts
with their respective affinities. When such an interrupt fires, map
it onto the right pseudo-interrupt.

Signed-off-by: Marc Zyngier <maz@...nel.org>
---
 drivers/irqchip/irq-apple-aic.c | 34 +++++++++++++++++++++------------
 1 file changed, 22 insertions(+), 12 deletions(-)

diff --git a/drivers/irqchip/irq-apple-aic.c b/drivers/irqchip/irq-apple-aic.c
index 30ca80ccda8b..23f5f10e974e 100644
--- a/drivers/irqchip/irq-apple-aic.c
+++ b/drivers/irqchip/irq-apple-aic.c
@@ -155,7 +155,7 @@
 #define SYS_IMP_APL_UPMSR_EL1		sys_reg(3, 7, 15, 6, 4)
 #define UPMSR_IACT			BIT(0)
 
-#define AIC_NR_FIQ		4
+#define AIC_NR_FIQ		6
 #define AIC_NR_SWIPI		32
 
 /*
@@ -207,6 +207,11 @@ static bool __is_pcore(u64 mpidr)
 	return MPIDR_AFFINITY_LEVEL(mpidr, 2) == 1;
 }
 
+static bool is_pcore(void)
+{
+	return __is_pcore(read_cpuid_mpidr());
+}
+
 /*
  * IRQ irqchip
  */
@@ -420,16 +425,10 @@ static void __exception_irq_entry aic_handle_fiq(struct pt_regs *regs)
 						  aic_irqc->nr_hw + AIC_TMR_EL02_VIRT);
 	}
 
-	if ((read_sysreg_s(SYS_IMP_APL_PMCR0_EL1) & (PMCR0_IMODE | PMCR0_IACT)) ==
-			(FIELD_PREP(PMCR0_IMODE, PMCR0_IMODE_FIQ) | PMCR0_IACT)) {
-		/*
-		 * Not supported yet, let's figure out how to handle this when
-		 * we implement these proprietary performance counters. For now,
-		 * just mask it and move on.
-		 */
-		pr_err_ratelimited("PMC FIQ fired. Masking.\n");
-		sysreg_clear_set_s(SYS_IMP_APL_PMCR0_EL1, PMCR0_IMODE | PMCR0_IACT,
-				   FIELD_PREP(PMCR0_IMODE, PMCR0_IMODE_OFF));
+	if (read_sysreg_s(SYS_IMP_APL_PMCR0_EL1) & PMCR0_IACT) {
+		int irq = is_pcore() ? AIC_CPU_PMU_P : AIC_CPU_PMU_E;
+		generic_handle_domain_irq(aic_irqc->hw_domain,
+					  aic_irqc->nr_hw + irq);
 	}
 
 	if (FIELD_GET(UPMCR0_IMODE, read_sysreg_s(SYS_IMP_APL_UPMCR0_EL1)) == UPMCR0_IMODE_FIQ &&
@@ -469,7 +468,18 @@ static int aic_irq_domain_map(struct irq_domain *id, unsigned int irq,
 				    handle_fasteoi_irq, NULL, NULL);
 		irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(irq)));
 	} else {
-		irq_set_percpu_devid(irq);
+		switch (hw - ic->nr_hw) {
+		case AIC_CPU_PMU_P:
+			irq_set_percpu_devid_partition(irq, &ic->pcore_mask);
+			break;
+		case AIC_CPU_PMU_E:
+			irq_set_percpu_devid_partition(irq, &ic->ecore_mask);
+			break;
+		default:
+			irq_set_percpu_devid(irq);
+			break;
+		}
+
 		irq_domain_set_info(id, irq, hw, &fiq_chip, id->host_data,
 				    handle_percpu_devid_irq, NULL, NULL);
 	}
-- 
2.30.2