Merge remote-tracking branch 'origin/irq/ipi-as-irq' into irq/irqchip-next

Signed-off-by: Marc Zyngier <maz@kernel.org>

1 files changed, 137 insertions, 104 deletions

diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index a27ba2cc1dce..30edcca627d6 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -83,9 +83,6 @@ struct gic_chip_data {
 #endif
 	struct irq_domain *domain;
 	unsigned int gic_irqs;
-#ifdef CONFIG_GIC_NON_BANKED
-	void __iomem *(*get_base)(union gic_base *);
-#endif
 };
 
 #ifdef CONFIG_BL_SWITCHER
@@ -124,36 +121,30 @@ static struct gic_chip_data gic_data[CONFIG_ARM_GIC_MAX_NR] __read_mostly;
 
 static struct gic_kvm_info gic_v2_kvm_info;
 
+static DEFINE_PER_CPU(u32, sgi_intid);
+
 #ifdef CONFIG_GIC_NON_BANKED
-static void __iomem *gic_get_percpu_base(union gic_base *base)
-{
-	return raw_cpu_read(*base->percpu_base);
-}
+static DEFINE_STATIC_KEY_FALSE(frankengic_key);
 
-static void __iomem *gic_get_common_base(union gic_base *base)
+static void enable_frankengic(void)
 {
-	return base->common_base;
+	static_branch_enable(&frankengic_key);
 }
 
-static inline void __iomem *gic_data_dist_base(struct gic_chip_data *data)
+static inline void __iomem *__get_base(union gic_base *base)
 {
-	return data->get_base(&data->dist_base);
-}
+	if (static_branch_unlikely(&frankengic_key))
+		return raw_cpu_read(*base->percpu_base);
 
-static inline void __iomem *gic_data_cpu_base(struct gic_chip_data *data)
-{
-	return data->get_base(&data->cpu_base);
+	return base->common_base;
 }
 
-static inline void gic_set_base_accessor(struct gic_chip_data *data,
-					 void __iomem *(*f)(union gic_base *))
-{
-	data->get_base = f;
-}
+#define gic_data_dist_base(d)	__get_base(&(d)->dist_base)
+#define gic_data_cpu_base(d)	__get_base(&(d)->cpu_base)
 #else
 #define gic_data_dist_base(d)	((d)->dist_base.common_base)
 #define gic_data_cpu_base(d)	((d)->cpu_base.common_base)
-#define gic_set_base_accessor(d, f)
+#define enable_frankengic()	do { } while(0)
 #endif
 
 static inline void __iomem *gic_dist_base(struct irq_data *d)
@@ -226,16 +217,26 @@ static void gic_unmask_irq(struct irq_data *d)
 
 static void gic_eoi_irq(struct irq_data *d)
 {
-	writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_EOI);
+	u32 hwirq = gic_irq(d);
+
+	if (hwirq < 16)
+		hwirq = this_cpu_read(sgi_intid);
+
+	writel_relaxed(hwirq, gic_cpu_base(d) + GIC_CPU_EOI);
 }
 
 static void gic_eoimode1_eoi_irq(struct irq_data *d)
 {
+	u32 hwirq = gic_irq(d);
+
 	/* Do not deactivate an IRQ forwarded to a vcpu. */
 	if (irqd_is_forwarded_to_vcpu(d))
 		return;
 
-	writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_DEACTIVATE);
+	if (hwirq < 16)
+		hwirq = this_cpu_read(sgi_intid);
+
+	writel_relaxed(hwirq, gic_cpu_base(d) + GIC_CPU_DEACTIVATE);
 }
 
 static int gic_irq_set_irqchip_state(struct irq_data *d,
@@ -295,7 +296,7 @@ static int gic_set_type(struct irq_data *d, unsigned int type)
 
 	/* Interrupt configuration for SGIs can't be changed */
 	if (gicirq < 16)
-		return -EINVAL;
+		return type != IRQ_TYPE_EDGE_RISING ? -EINVAL : 0;
 
 	/* SPIs have restrictions on the supported types */
 	if (gicirq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
@@ -315,7 +316,7 @@ static int gic_set_type(struct irq_data *d, unsigned int type)
 static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu)
 {
 	/* Only interrupts on the primary GIC can be forwarded to a vcpu. */
-	if (cascading_gic_irq(d))
+	if (cascading_gic_irq(d) || gic_irq(d) < 16)
 		return -EINVAL;
 
 	if (vcpu)
@@ -325,28 +326,6 @@ static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu)
 	return 0;
 }
 
-#ifdef CONFIG_SMP
-static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
-			    bool force)
-{
-	void __iomem *reg = gic_dist_base(d) + GIC_DIST_TARGET + gic_irq(d);
-	unsigned int cpu;
-
-	if (!force)
-		cpu = cpumask_any_and(mask_val, cpu_online_mask);
-	else
-		cpu = cpumask_first(mask_val);
-
-	if (cpu >= NR_GIC_CPU_IF || cpu >= nr_cpu_ids)
-		return -EINVAL;
-
-	writeb_relaxed(gic_cpu_map[cpu], reg);
-	irq_data_update_effective_affinity(d, cpumask_of(cpu));
-
-	return IRQ_SET_MASK_OK_DONE;
-}
-#endif
-
 static void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
 {
 	u32 irqstat, irqnr;
@@ -357,31 +336,33 @@ static void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
 		irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK);
 		irqnr = irqstat & GICC_IAR_INT_ID_MASK;
 
-		if (likely(irqnr > 15 && irqnr < 1020)) {
-			if (static_branch_likely(&supports_deactivate_key))
-				writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
-			isb();
-			handle_domain_irq(gic->domain, irqnr, regs);
-			continue;
-		}
-		if (irqnr < 16) {
+		if (unlikely(irqnr >= 1020))
+			break;
+
+		if (static_branch_likely(&supports_deactivate_key))
 			writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
-			if (static_branch_likely(&supports_deactivate_key))
-				writel_relaxed(irqstat, cpu_base + GIC_CPU_DEACTIVATE);
-#ifdef CONFIG_SMP
+		isb();
+
+		/*
+		 * Ensure any shared data written by the CPU sending the IPI
+		 * is read after we've read the ACK register on the GIC.
+		 *
+		 * Pairs with the write barrier in gic_ipi_send_mask
+		 */
+		if (irqnr <= 15) {
+			smp_rmb();
+
 			/*
-			 * Ensure any shared data written by the CPU sending
-			 * the IPI is read after we've read the ACK register
-			 * on the GIC.
-			 *
-			 * Pairs with the write barrier in gic_raise_softirq
+			 * The GIC encodes the source CPU in GICC_IAR,
+			 * leading to the deactivation to fail if not
+			 * written back as is to GICC_EOI.  Stash the INTID
+			 * away for gic_eoi_irq() to write back.  This only
+			 * works because we don't nest SGIs...
 			 */
-			smp_rmb();
-			handle_IPI(irqnr, regs);
-#endif
-			continue;
+			this_cpu_write(sgi_intid, irqstat);
 		}
-		break;
+
+		handle_domain_irq(gic->domain, irqnr, regs);
 	} while (1);
 }
 
@@ -728,11 +709,6 @@ static int gic_notifier(struct notifier_block *self, unsigned long cmd,	void *v)
 	int i;
 
 	for (i = 0; i < CONFIG_ARM_GIC_MAX_NR; i++) {
-#ifdef CONFIG_GIC_NON_BANKED
-		/* Skip over unused GICs */
-		if (!gic_data[i].get_base)
-			continue;
-#endif
 		switch (cmd) {
 		case CPU_PM_ENTER:
 			gic_cpu_save(&gic_data[i]);
@@ -795,14 +771,34 @@ static int gic_pm_init(struct gic_chip_data *gic)
 #endif
 
 #ifdef CONFIG_SMP
-static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
+static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
+			    bool force)
+{
+	void __iomem *reg = gic_dist_base(d) + GIC_DIST_TARGET + gic_irq(d);
+	unsigned int cpu;
+
+	if (!force)
+		cpu = cpumask_any_and(mask_val, cpu_online_mask);
+	else
+		cpu = cpumask_first(mask_val);
+
+	if (cpu >= NR_GIC_CPU_IF || cpu >= nr_cpu_ids)
+		return -EINVAL;
+
+	writeb_relaxed(gic_cpu_map[cpu], reg);
+	irq_data_update_effective_affinity(d, cpumask_of(cpu));
+
+	return IRQ_SET_MASK_OK_DONE;
+}
+
+static void gic_ipi_send_mask(struct irq_data *d, const struct cpumask *mask)
 {
 	int cpu;
 	unsigned long flags, map = 0;
 
 	if (unlikely(nr_cpu_ids == 1)) {
 		/* Only one CPU? let's do a self-IPI... */
-		writel_relaxed(2 << 24 | irq,
+		writel_relaxed(2 << 24 | d->hwirq,
 			       gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
 		return;
 	}
@@ -820,10 +816,41 @@ static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
 	dmb(ishst);
 
 	/* this always happens on GIC0 */
-	writel_relaxed(map << 16 | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
+	writel_relaxed(map << 16 | d->hwirq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
 
 	gic_unlock_irqrestore(flags);
 }
+
+static int gic_starting_cpu(unsigned int cpu)
+{
+	gic_cpu_init(&gic_data[0]);
+	return 0;
+}
+
+static __init void gic_smp_init(void)
+{
+	struct irq_fwspec sgi_fwspec = {
+		.fwnode		= gic_data[0].domain->fwnode,
+		.param_count	= 1,
+	};
+	int base_sgi;
+
+	cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_GIC_STARTING,
+				  "irqchip/arm/gic:starting",
+				  gic_starting_cpu, NULL);
+
+	base_sgi = __irq_domain_alloc_irqs(gic_data[0].domain, -1, 8,
+					   NUMA_NO_NODE, &sgi_fwspec,
+					   false, NULL);
+	if (WARN_ON(base_sgi <= 0))
+		return;
+
+	set_smp_ipi_range(base_sgi, 8);
+}
+#else
+#define gic_smp_init()		do { } while(0)
+#define gic_set_affinity	NULL
+#define gic_ipi_send_mask	NULL
 #endif
 
 #ifdef CONFIG_BL_SWITCHER
@@ -970,15 +997,24 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
 {
 	struct gic_chip_data *gic = d->host_data;
 
-	if (hw < 32) {
+	switch (hw) {
+	case 0 ... 15:
+		irq_set_percpu_devid(irq);
+		irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data,
+				    handle_percpu_devid_fasteoi_ipi,
+				    NULL, NULL);
+		break;
+	case 16 ... 31:
 		irq_set_percpu_devid(irq);
 		irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data,
 				    handle_percpu_devid_irq, NULL, NULL);
-	} else {
+		break;
+	default:
 		irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data,
 				    handle_fasteoi_irq, NULL, NULL);
 		irq_set_probe(irq);
 		irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(irq)));
+		break;
 	}
 	return 0;
 }
@@ -992,19 +1028,26 @@ static int gic_irq_domain_translate(struct irq_domain *d,
 				    unsigned long *hwirq,
 				    unsigned int *type)
 {
+	if (fwspec->param_count == 1 && fwspec->param[0] < 16) {
+		*hwirq = fwspec->param[0];
+		*type = IRQ_TYPE_EDGE_RISING;
+		return 0;
+	}
+
 	if (is_of_node(fwspec->fwnode)) {
 		if (fwspec->param_count < 3)
 			return -EINVAL;
 
-		/* Get the interrupt number and add 16 to skip over SGIs */
-		*hwirq = fwspec->param[1] + 16;
-
-		/*
-		 * For SPIs, we need to add 16 more to get the GIC irq
-		 * ID number
-		 */
-		if (!fwspec->param[0])
-			*hwirq += 16;
+		switch (fwspec->param[0]) {
+		case 0:			/* SPI */
+			*hwirq = fwspec->param[1] + 32;
+			break;
+		case 1:			/* PPI */
+			*hwirq = fwspec->param[1] + 16;
+			break;
+		default:
+			return -EINVAL;
+		}
 
 		*type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
 
@@ -1027,12 +1070,6 @@ static int gic_irq_domain_translate(struct irq_domain *d,
 	return -EINVAL;
 }
 
-static int gic_starting_cpu(unsigned int cpu)
-{
-	gic_cpu_init(&gic_data[0]);
-	return 0;
-}
-
 static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
 				unsigned int nr_irqs, void *arg)
 {
@@ -1079,10 +1116,10 @@ static void gic_init_chip(struct gic_chip_data *gic, struct device *dev,
 		gic->chip.irq_set_vcpu_affinity = gic_irq_set_vcpu_affinity;
 	}
 
-#ifdef CONFIG_SMP
-	if (gic == &gic_data[0])
+	if (gic == &gic_data[0]) {
 		gic->chip.irq_set_affinity = gic_set_affinity;
-#endif
+		gic->chip.ipi_send_mask = gic_ipi_send_mask;
+	}
 }
 
 static int gic_init_bases(struct gic_chip_data *gic,
@@ -1112,7 +1149,7 @@ static int gic_init_bases(struct gic_chip_data *gic,
 				gic->raw_cpu_base + offset;
 		}
 
-		gic_set_base_accessor(gic, gic_get_percpu_base);
+		enable_frankengic();
 	} else {
 		/* Normal, sane GIC... */
 		WARN(gic->percpu_offset,
@@ -1120,7 +1157,6 @@ static int gic_init_bases(struct gic_chip_data *gic,
 		     gic->percpu_offset);
 		gic->dist_base.common_base = gic->raw_dist_base;
 		gic->cpu_base.common_base = gic->raw_cpu_base;
-		gic_set_base_accessor(gic, gic_get_common_base);
 	}
 
 	/*
@@ -1199,12 +1235,7 @@ static int __init __gic_init_bases(struct gic_chip_data *gic,
 		 */
 		for (i = 0; i < NR_GIC_CPU_IF; i++)
 			gic_cpu_map[i] = 0xff;
-#ifdef CONFIG_SMP
-		set_smp_cross_call(gic_raise_softirq);
-#endif
-		cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_GIC_STARTING,
-					  "irqchip/arm/gic:starting",
-					  gic_starting_cpu, NULL);
+
 		set_handle_irq(gic_handle_irq);
 		if (static_branch_likely(&supports_deactivate_key))
 			pr_info("GIC: Using split EOI/Deactivate mode\n");
@@ -1221,6 +1252,8 @@ static int __init __gic_init_bases(struct gic_chip_data *gic,
 	ret = gic_init_bases(gic, handle);
 	if (ret)
 		kfree(name);
+	else if (gic == &gic_data[0])
+		gic_smp_init();
 
 	return ret;
 }