Merge branch 'linus' into smp/hotplug

Apply upstream changes to avoid conflicts with pending patches.

4 files changed, 36 insertions, 7 deletions

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 7ceaba81efb4..36b9c28a5c91 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -1545,7 +1545,12 @@ static int its_force_quiescent(void __iomem *base)
         u32 val;
 
         val = readl_relaxed(base + GITS_CTLR);
-        if (val & GITS_CTLR_QUIESCENT)
+        /*
+         * GIC architecture specification requires the ITS to be both
+         * disabled and quiescent for writes to GITS_BASER<n> or
+         * GITS_CBASER to not have UNPREDICTABLE results.
+         */
+        if ((val & GITS_CTLR_QUIESCENT) && !(val & GITS_CTLR_ENABLE))
                 return 0;
 
         /* Disable the generation of all interrupts to this ITS */
diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 6fc56c3466b0..ede5672ab34d 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -667,13 +667,20 @@ static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
 #endif
 
 #ifdef CONFIG_CPU_PM
+/* Check whether it's single security state view */
+static bool gic_dist_security_disabled(void)
+{
+        return readl_relaxed(gic_data.dist_base + GICD_CTLR) & GICD_CTLR_DS;
+}
+
 static int gic_cpu_pm_notifier(struct notifier_block *self,
                                unsigned long cmd, void *v)
 {
         if (cmd == CPU_PM_EXIT) {
-                gic_enable_redist(true);
+                if (gic_dist_security_disabled())
+                        gic_enable_redist(true);
                 gic_cpu_sys_reg_init();
-        } else if (cmd == CPU_PM_ENTER) {
+        } else if (cmd == CPU_PM_ENTER && gic_dist_security_disabled()) {
                 gic_write_grpen1(0);
                 gic_enable_redist(false);
         }
diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index c2cab572c511..390fac59c6bc 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -769,6 +769,13 @@ static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
         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,
+                               gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
+                return;
+        }
+
         raw_spin_lock_irqsave(&irq_controller_lock, flags);
 
         /* Convert our logical CPU mask into a physical one. */
diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index c5f33c3bd228..83f498393a7f 100644
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -713,9 +713,6 @@ static int gic_shared_irq_domain_map(struct irq_domain *d, unsigned int virq,
         unsigned long flags;
         int i;
 
-        irq_set_chip_and_handler(virq, &gic_level_irq_controller,
-                                 handle_level_irq);
-
         spin_lock_irqsave(&gic_lock, flags);
         gic_map_to_pin(intr, gic_cpu_pin);
         gic_map_to_vpe(intr, mips_cm_vp_id(vpe));
@@ -732,6 +729,10 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq,
 {
         if (GIC_HWIRQ_TO_LOCAL(hw) < GIC_NUM_LOCAL_INTRS)
                 return gic_local_irq_domain_map(d, virq, hw);
+
+        irq_set_chip_and_handler(virq, &gic_level_irq_controller,
+                                 handle_level_irq);
+
         return gic_shared_irq_domain_map(d, virq, hw, 0);
 }
 
@@ -771,11 +772,13 @@ static int gic_irq_domain_alloc(struct irq_domain *d, unsigned int virq,
                         hwirq = GIC_SHARED_TO_HWIRQ(base_hwirq + i);
 
                         ret = irq_domain_set_hwirq_and_chip(d, virq + i, hwirq,
-                                                            &gic_edge_irq_controller,
+                                                            &gic_level_irq_controller,
                                                             NULL);
                         if (ret)
                                 goto error;
 
+                        irq_set_handler(virq + i, handle_level_irq);
+
                         ret = gic_shared_irq_domain_map(d, virq + i, hwirq, cpu);
                         if (ret)
                                 goto error;
@@ -890,10 +893,17 @@ void gic_dev_domain_free(struct irq_domain *d, unsigned int virq,
         return;
 }
 
+static void gic_dev_domain_activate(struct irq_domain *domain,
+                                    struct irq_data *d)
+{
+        gic_shared_irq_domain_map(domain, d->irq, d->hwirq, 0);
+}
+
 static struct irq_domain_ops gic_dev_domain_ops = {
         .xlate = gic_dev_domain_xlate,
         .alloc = gic_dev_domain_alloc,
         .free = gic_dev_domain_free,
+        .activate = gic_dev_domain_activate,
 };
 
 static int gic_ipi_domain_xlate(struct irq_domain *d, struct device_node *ctrlr,