irqchip/gic: Rework gic_configure_irq to take the full ICFGR base

gic_configure_irq is currently passed the (re)distributor address,
to which it applies an a fixed offset to get to the configuration
registers. This offset is constant across all GICs, or rather it was
until to v3.1...

An easy way out is for the individual drivers to pass the base
address of the configuration register for the considered interrupt.
At the same time, move part of the error handling back to the
individual drivers, as things are about to change on that front.
Signed-off-by: Marc Zyngier <maz@kernel.org>

drivers/irqchip/irq-gic-common.c

@@ -63,7 +63,7 @@ int gic_configure_irq(unsigned int irq, unsigned int type,
 	 * for "irq", depending on "type".
 	 */
 	raw_spin_lock_irqsave(&irq_controller_lock, flags);
-	val = oldval = readl_relaxed(base + GIC_DIST_CONFIG + confoff);
+	val = oldval = readl_relaxed(base + confoff);
 	if (type & IRQ_TYPE_LEVEL_MASK)
 		val &= ~confmask;
 	else if (type & IRQ_TYPE_EDGE_BOTH)
@@ -83,14 +83,10 @@ int gic_configure_irq(unsigned int irq, unsigned int type,
 	 * does not allow us to set the configuration or we are in a
 	 * non-secure mode, and hence it may not be catastrophic.
 	 */
-	writel_relaxed(val, base + GIC_DIST_CONFIG + confoff);
-	if (readl_relaxed(base + GIC_DIST_CONFIG + confoff) != val) {
-		if (WARN_ON(irq >= 32))
-			ret = -EINVAL;
-		else
-			pr_warn("GIC: PPI%d is secure or misconfigured\n",
-				irq - 16);
-	}
+	writel_relaxed(val, base + confoff);
+	if (readl_relaxed(base + confoff) != val)
+		ret = -EINVAL;
+
 	raw_spin_unlock_irqrestore(&irq_controller_lock, flags);
 
 	if (sync_access)

drivers/irqchip/irq-gic-v3.c

@@ -407,6 +407,7 @@ static int gic_set_type(struct irq_data *d, unsigned int type)
 	unsigned int irq = gic_irq(d);
 	void (*rwp_wait)(void);
 	void __iomem *base;
+	int ret;
 
 	/* Interrupt configuration for SGIs can't be changed */
 	if (irq < 16)
@@ -425,7 +426,15 @@ static int gic_set_type(struct irq_data *d, unsigned int type)
 		rwp_wait = gic_dist_wait_for_rwp;
 	}
 
-	return gic_configure_irq(irq, type, base, rwp_wait);
+
+	ret = gic_configure_irq(irq, type, base + GICD_ICFGR, rwp_wait);
+	if (ret && irq < 32) {
+		/* Misconfigured PPIs are usually not fatal */
+		pr_warn("GIC: PPI%d is secure or misconfigured\n", irq - 16);
+		ret = 0;
+	}
+
+	return ret;
 }
 
 static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu)

drivers/irqchip/irq-gic.c

@@ -291,6 +291,7 @@ static int gic_set_type(struct irq_data *d, unsigned int type)
 {
 	void __iomem *base = gic_dist_base(d);
 	unsigned int gicirq = gic_irq(d);
+	int ret;
 
 	/* Interrupt configuration for SGIs can't be changed */
 	if (gicirq < 16)
@@ -301,7 +302,14 @@ static int gic_set_type(struct irq_data *d, unsigned int type)
 			    type != IRQ_TYPE_EDGE_RISING)
 		return -EINVAL;
 
-	return gic_configure_irq(gicirq, type, base, NULL);
+	ret = gic_configure_irq(gicirq, type, base + GIC_DIST_CONFIG, NULL);
+	if (ret && gicirq < 32) {
+		/* Misconfigured PPIs are usually not fatal */
+		pr_warn("GIC: PPI%d is secure or misconfigured\n", gicirq - 16);
+		ret = 0;
+	}
+
+	return ret;
 }
 
 static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu)

drivers/irqchip/irq-hip04.c

@@ -130,7 +130,12 @@ static int hip04_irq_set_type(struct irq_data *d, unsigned int type)
 
 	raw_spin_lock(&irq_controller_lock);
 
-	ret = gic_configure_irq(irq, type, base, NULL);
+	ret = gic_configure_irq(irq, type, base + GIC_DIST_CONFIG, NULL);
+	if (ret && irq < 32) {
+		/* Misconfigured PPIs are usually not fatal */
+		pr_warn("GIC: PPI%d is secure or misconfigured\n", irq - 16);
+		ret = 0;
+	}
 
 	raw_spin_unlock(&irq_controller_lock);