Re: [PATCH v5 08/23] irqchip/gic-v4.1: Plumb skeletal VSGI irqchip
From: Marc Zyngier
Date: Thu Mar 19 2020 - 06:03:26 EST
Hi Eric,
On 2020-03-16 17:10, Auger Eric wrote:
Hi Marc,
On 3/4/20 9:33 PM, Marc Zyngier wrote:
Since GICv4.1 has the capability to inject 16 SGIs into each VPE,
and that I'm keen not to invent too many specific interfaces to
manipulate these interrupts, let's pretend that each of these SGIs
is an actual Linux interrupt.
For that matter, let's introduce a minimal irqchip and irqdomain
setup that will get fleshed up in the following patches.
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Reviewed-by: Zenghui Yu <yuzenghui@xxxxxxxxxx>
---
drivers/irqchip/irq-gic-v3-its.c | 68
+++++++++++++++++++++++++++++-
drivers/irqchip/irq-gic-v4.c | 8 +++-
include/linux/irqchip/arm-gic-v4.h | 9 +++-
3 files changed, 81 insertions(+), 4 deletions(-)
diff --git a/drivers/irqchip/irq-gic-v3-its.c
b/drivers/irqchip/irq-gic-v3-its.c
index 54d6fdf7a28e..112b452fcb40 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -3870,6 +3870,67 @@ static struct irq_chip its_vpe_4_1_irq_chip = {
.irq_set_vcpu_affinity = its_vpe_4_1_set_vcpu_affinity,
};
+static int its_sgi_set_affinity(struct irq_data *d,
+ const struct cpumask *mask_val,
+ bool force)
+{
+ return -EINVAL;
+}
+
+static struct irq_chip its_sgi_irq_chip = {
+ .name = "GICv4.1-sgi",
+ .irq_set_affinity = its_sgi_set_affinity,
+};
nit: const?
That would create a warning with irq_domain_set_hwirq_and_chip(), which
doesn't take a const argument. I think this is fixable in the long run,
but only as a sweeping tree-wide change.
+
+static int its_sgi_irq_domain_alloc(struct irq_domain *domain,
+ unsigned int virq, unsigned int nr_irqs,
+ void *args)
+{
+ struct its_vpe *vpe = args;
+ int i;
+
+ /* Yes, we do want 16 SGIs */
+ WARN_ON(nr_irqs != 16);
+
+ for (i = 0; i < 16; i++) {
+ vpe->sgi_config[i].priority = 0;
+ vpe->sgi_config[i].enabled = false;
+ vpe->sgi_config[i].group = false;
+
+ irq_domain_set_hwirq_and_chip(domain, virq + i, i,
+ &its_sgi_irq_chip, vpe);
+ irq_set_status_flags(virq + i, IRQ_DISABLE_UNLAZY);
+ }
+
+ return 0;
+}
+
+static void its_sgi_irq_domain_free(struct irq_domain *domain,
+ unsigned int virq,
+ unsigned int nr_irqs)
+{
+ /* Nothing to do */
+}
+
+static int its_sgi_irq_domain_activate(struct irq_domain *domain,
+ struct irq_data *d, bool reserve)
+{
+ return 0;
+}
+
+static void its_sgi_irq_domain_deactivate(struct irq_domain *domain,
+ struct irq_data *d)
+{
+ /* Nothing to do */
+}
+
+static struct irq_domain_ops its_sgi_domain_ops = {
+ .alloc = its_sgi_irq_domain_alloc,
+ .free = its_sgi_irq_domain_free,
+ .activate = its_sgi_irq_domain_activate,
+ .deactivate = its_sgi_irq_domain_deactivate,
+};
nit: const?
This one can work with a bit of surgery below:
diff --git a/drivers/irqchip/irq-gic-v3-its.c
b/drivers/irqchip/irq-gic-v3-its.c
index 2e12bc52e3a2..321f73015d6c 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -4129,7 +4129,7 @@ static void its_sgi_irq_domain_deactivate(struct
irq_domain *domain,
its_configure_sgi(d, true);
}
-static struct irq_domain_ops its_sgi_domain_ops = {
+static const struct irq_domain_ops its_sgi_domain_ops = {
.alloc = its_sgi_irq_domain_alloc,
.free = its_sgi_irq_domain_free,
.activate = its_sgi_irq_domain_activate,
@@ -5182,10 +5182,12 @@ int __init its_init(struct fwnode_handle
*handle, struct rdists *rdists,
rdists->has_rvpeid = false;
if (has_v4 & rdists->has_vlpis) {
- struct irq_domain_ops *sgi_ops = NULL;
+ const struct irq_domain_ops *sgi_ops;
if (has_v4_1)
sgi_ops = &its_sgi_domain_ops;
+ else
+ sgi_ops = NULL;
if (its_init_vpe_domain() ||
its_init_v4(parent_domain, &its_vpe_domain_ops, sgi_ops)) {
+
static int its_vpe_id_alloc(void)
{
return ida_simple_get(&its_vpeid_ida, 0, ITS_MAX_VPEID, GFP_KERNEL);
@@ -4912,8 +4973,13 @@ int __init its_init(struct fwnode_handle
*handle, struct rdists *rdists,
rdists->has_rvpeid = false;
if (has_v4 & rdists->has_vlpis) {
+ struct irq_domain_ops *sgi_ops = NULL;
+
+ if (has_v4_1)
+ sgi_ops = &its_sgi_domain_ops;
+
if (its_init_vpe_domain() ||
- its_init_v4(parent_domain, &its_vpe_domain_ops)) {
+ its_init_v4(parent_domain, &its_vpe_domain_ops, sgi_ops)) {
rdists->has_vlpis = false;
pr_err("ITS: Disabling GICv4 support\n");
}
diff --git a/drivers/irqchip/irq-gic-v4.c
b/drivers/irqchip/irq-gic-v4.c
index 45969927cc81..c01910d53f9e 100644
--- a/drivers/irqchip/irq-gic-v4.c
+++ b/drivers/irqchip/irq-gic-v4.c
@@ -85,6 +85,7 @@
static struct irq_domain *gic_domain;
static const struct irq_domain_ops *vpe_domain_ops;
+static const struct irq_domain_ops *sgi_domain_ops;
int its_alloc_vcpu_irqs(struct its_vm *vm)
{
@@ -216,12 +217,15 @@ int its_prop_update_vlpi(int irq, u8 config,
bool inv)
return irq_set_vcpu_affinity(irq, &info);
}
-int its_init_v4(struct irq_domain *domain, const struct
irq_domain_ops *ops)
+int its_init_v4(struct irq_domain *domain,
+ const struct irq_domain_ops *vpe_ops,
+ const struct irq_domain_ops *sgi_ops)
{
if (domain) {
pr_info("ITS: Enabling GICv4 support\n");
gic_domain = domain;
- vpe_domain_ops = ops;
+ vpe_domain_ops = vpe_ops;
+ sgi_domain_ops = sgi_ops;
return 0;
}
diff --git a/include/linux/irqchip/arm-gic-v4.h
b/include/linux/irqchip/arm-gic-v4.h
index 439963f4c66a..44e8c19e3d56 100644
--- a/include/linux/irqchip/arm-gic-v4.h
+++ b/include/linux/irqchip/arm-gic-v4.h
@@ -49,6 +49,11 @@ struct its_vpe {
};
/* GICv4.1 implementations */
struct {
+ struct {
+ u8 priority;
+ bool enabled;
+ bool group;
+ } sgi_config[16];
atomic_t vmapp_count;
};
};
@@ -123,6 +128,8 @@ int its_unmap_vlpi(int irq);
int its_prop_update_vlpi(int irq, u8 config, bool inv);
struct irq_domain_ops;
-int its_init_v4(struct irq_domain *domain, const struct
irq_domain_ops *ops);
+int its_init_v4(struct irq_domain *domain,
+ const struct irq_domain_ops *vpe_ops,
+ const struct irq_domain_ops *sgi_ops);
#endif
Reviewed-by: Eric Auger <eric.auger@xxxxxxxxxx>
Thanks,
M.
--
Jazz is not dead. It just smells funny...