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irqchip/gic-v4.1: Add VSGI allocation/teardown

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Allocate per-VPE SGIs when initializing the GIC-specific part of the
VPE data structure.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Link: https://lore.kernel.org/r/20200304203330.4967-15-maz@kernel.org
This commit is contained in:
Marc Zyngier 2020-03-04 20:33:21 +00:00
parent ae699ad348
commit 6d31b6ff98
2 changed files with 69 additions and 1 deletions
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68
drivers/irqchip/irq-gic-v4.c
View File

@ -92,6 +92,47 @@ static bool has_v4_1(void)
return !!sgi_domain_ops;
}
static int its_alloc_vcpu_sgis(struct its_vpe *vpe, int idx)
{
char *name;
int sgi_base;
if (!has_v4_1())
return 0;
name = kasprintf(GFP_KERNEL, "GICv4-sgi-%d", task_pid_nr(current));
if (!name)
goto err;
vpe->fwnode = irq_domain_alloc_named_id_fwnode(name, idx);
if (!vpe->fwnode)
goto err;
kfree(name);
name = NULL;
vpe->sgi_domain = irq_domain_create_linear(vpe->fwnode, 16,
sgi_domain_ops, vpe);
if (!vpe->sgi_domain)
goto err;
sgi_base = __irq_domain_alloc_irqs(vpe->sgi_domain, -1, 16,
NUMA_NO_NODE, vpe,
false, NULL);
if (sgi_base <= 0)
goto err;
return 0;
err:
if (vpe->sgi_domain)
irq_domain_remove(vpe->sgi_domain);
if (vpe->fwnode)
irq_domain_free_fwnode(vpe->fwnode);
kfree(name);
return -ENOMEM;
}
int its_alloc_vcpu_irqs(struct its_vm *vm)
{
int vpe_base_irq, i;
@ -118,8 +159,13 @@ int its_alloc_vcpu_irqs(struct its_vm *vm)
if (vpe_base_irq <= 0)
goto err;
for (i = 0; i < vm->nr_vpes; i++)
for (i = 0; i < vm->nr_vpes; i++) {
int ret;
vm->vpes[i]->irq = vpe_base_irq + i;
ret = its_alloc_vcpu_sgis(vm->vpes[i], i);
if (ret)
goto err;
}
return 0;
@ -132,8 +178,28 @@ err:
return -ENOMEM;
}
static void its_free_sgi_irqs(struct its_vm *vm)
{
int i;
if (!has_v4_1())
return;
for (i = 0; i < vm->nr_vpes; i++) {
unsigned int irq = irq_find_mapping(vm->vpes[i]->sgi_domain, 0);
if (WARN_ON(!irq))
continue;
irq_domain_free_irqs(irq, 16);
irq_domain_remove(vm->vpes[i]->sgi_domain);
irq_domain_free_fwnode(vm->vpes[i]->fwnode);
}
}
void its_free_vcpu_irqs(struct its_vm *vm)
{
its_free_sgi_irqs(vm);
irq_domain_free_irqs(vm->vpes[0]->irq, vm->nr_vpes);
irq_domain_remove(vm->domain);
irq_domain_free_fwnode(vm->fwnode);

2
include/linux/irqchip/arm-gic-v4.h
View File

@ -49,6 +49,8 @@ struct its_vpe {
};
/* GICv4.1 implementations */
struct {
struct fwnode_handle *fwnode;
struct irq_domain *sgi_domain;
struct {
u8 priority;
bool enabled;