Re: [PATCH 06/11] irqchip/gic-v3: Configure SGIs as standard interrupts
From: Marc Zyngier
Date: Wed May 20 2020 - 06:24:51 EST
Hi Sumit,
On 2020-05-20 10:52, Sumit Garg wrote:
Hi Marc,
On Tue, 19 May 2020 at 21:48, Marc Zyngier <maz@xxxxxxxxxx> wrote:
Change the way we deal with GICv3 SGIs by turning them into proper
IRQs, and calling into the arch code to register the interrupt range
instead of a callback.
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
---
drivers/irqchip/irq-gic-v3.c | 91
+++++++++++++++++++++---------------
1 file changed, 53 insertions(+), 38 deletions(-)
diff --git a/drivers/irqchip/irq-gic-v3.c
b/drivers/irqchip/irq-gic-v3.c
index 23d7c87da407..d57289057b75 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -36,6 +36,9 @@
#define FLAGS_WORKAROUND_GICR_WAKER_MSM8996 (1ULL << 0)
#define FLAGS_WORKAROUND_CAVIUM_ERRATUM_38539 (1ULL << 1)
+#define GIC_IRQ_TYPE_PARTITION (GIC_IRQ_TYPE_LPI + 1)
+#define GIC_IRQ_TYPE_SGI (GIC_IRQ_TYPE_LPI + 2)
+
struct redist_region {
void __iomem *redist_base;
phys_addr_t phys_base;
@@ -657,38 +660,14 @@ static asmlinkage void __exception_irq_entry
gic_handle_irq(struct pt_regs *regs
if ((irqnr >= 1020 && irqnr <= 1023))
return;
- /* Treat anything but SGIs in a uniform way */
- if (likely(irqnr > 15)) {
- int err;
-
- if (static_branch_likely(&supports_deactivate_key))
- gic_write_eoir(irqnr);
- else
- isb();
-
- err = handle_domain_irq(gic_data.domain, irqnr, regs);
- if (err) {
- WARN_ONCE(true, "Unexpected interrupt
received!\n");
- gic_deactivate_unhandled(irqnr);
- }
- return;
- }
- if (irqnr < 16) {
+ if (static_branch_likely(&supports_deactivate_key))
gic_write_eoir(irqnr);
- if (static_branch_likely(&supports_deactivate_key))
- gic_write_dir(irqnr);
-#ifdef CONFIG_SMP
- /*
- * Unlike GICv2, we don't need an smp_rmb() here.
- * The control dependency from gic_read_iar to
- * the ISB in gic_write_eoir is enough to ensure
- * that any shared data read by handle_IPI will
- * be read after the ACK.
- */
- handle_IPI(irqnr, regs);
-#else
- WARN_ONCE(true, "Unexpected SGI received!\n");
-#endif
+ else
+ isb();
+
+ if (handle_domain_irq(gic_data.domain, irqnr, regs)) {
+ WARN_ONCE(true, "Unexpected interrupt received!\n");
+ gic_deactivate_unhandled(irqnr);
}
}
@@ -1136,11 +1115,11 @@ static void gic_send_sgi(u64 cluster_id, u16
tlist, unsigned int irq)
gic_write_sgi1r(val);
}
-static void gic_raise_softirq(const struct cpumask *mask, unsigned
int irq)
+static void gic_ipi_send_mask(struct irq_data *d, const struct
cpumask *mask)
{
int cpu;
- if (WARN_ON(irq >= 16))
+ if (WARN_ON(d->hwirq >= 16))
return;
/*
@@ -1154,7 +1133,7 @@ static void gic_raise_softirq(const struct
cpumask *mask, unsigned int irq)
u16 tlist;
tlist = gic_compute_target_list(&cpu, mask,
cluster_id);
- gic_send_sgi(cluster_id, tlist, irq);
+ gic_send_sgi(cluster_id, tlist, d->hwirq);
}
/* Force the above writes to ICC_SGI1R_EL1 to be executed */
@@ -1163,10 +1142,36 @@ static void gic_raise_softirq(const struct
cpumask *mask, unsigned int irq)
static void gic_smp_init(void)
{
- set_smp_cross_call(gic_raise_softirq);
+ struct irq_fwspec sgi_fwspec = {
+ .fwnode = gic_data.fwnode,
+ };
+ int base_sgi;
+
cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_GIC_STARTING,
"irqchip/arm/gicv3:starting",
gic_starting_cpu, NULL);
+
+ if (is_of_node(gic_data.fwnode)) {
+ /* DT */
+ sgi_fwspec.param_count = 3;
+ sgi_fwspec.param[0] = GIC_IRQ_TYPE_SGI;
+ sgi_fwspec.param[1] = 0;
+ sgi_fwspec.param[2] = IRQ_TYPE_EDGE_RISING;
+ } else {
+ /* ACPI */
+ sgi_fwspec.param_count = 2;
+ sgi_fwspec.param[0] = 0;
+ sgi_fwspec.param[1] = IRQ_TYPE_EDGE_RISING;
+ }
+
+ /* Register all 8 non-secure SGIs */
+ base_sgi = __irq_domain_alloc_irqs(gic_data.domain, -1, 8,
+ NUMA_NO_NODE, &sgi_fwspec,
+ false, NULL);
+ if (WARN_ON(base_sgi <= 0))
+ return;
+
+ set_smp_ipi_range(base_sgi, 8);
}
static int gic_set_affinity(struct irq_data *d, const struct cpumask
*mask_val,
@@ -1215,6 +1220,7 @@ static int gic_set_affinity(struct irq_data *d,
const struct cpumask *mask_val,
}
#else
#define gic_set_affinity NULL
+#define gic_ipi_send_mask NULL
#define gic_smp_init() do { } while(0)
#endif
@@ -1257,6 +1263,7 @@ static struct irq_chip gic_chip = {
.irq_set_irqchip_state = gic_irq_set_irqchip_state,
.irq_nmi_setup = gic_irq_nmi_setup,
.irq_nmi_teardown = gic_irq_nmi_teardown,
+ .ipi_send_mask = gic_ipi_send_mask,
.flags = IRQCHIP_SET_TYPE_MASKED |
IRQCHIP_SKIP_SET_WAKE |
IRQCHIP_MASK_ON_SUSPEND,
It looks like you missed to update "struct irq_chip gic_eoimode1_chip"
with similar change as follows:
diff --git a/drivers/irqchip/irq-gic-v3.c
b/drivers/irqchip/irq-gic-v3.c
index 2a09634..ceef63b 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -1291,6 +1291,7 @@ static struct irq_chip gic_eoimode1_chip = {
.irq_set_vcpu_affinity = gic_irq_set_vcpu_affinity,
.irq_nmi_setup = gic_irq_nmi_setup,
.irq_nmi_teardown = gic_irq_nmi_teardown,
+ .ipi_send_mask = gic_ipi_send_mask,
.flags = IRQCHIP_SET_TYPE_MASKED |
IRQCHIP_SKIP_SET_WAKE |
IRQCHIP_MASK_ON_SUSPEND,
After incorporating this change, your patch-set works fine on my
Developerbox machine.
Huh, well spotted. As I said, it has only been tested as guests,
hence not hitting this path. Time to throw it at the bigger stuff.
Thanks,
M.
--
Jazz is not dead. It just smells funny...