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irqchip/gic: Return an error if GIC initialisation fails 

If the GIC initialisation fails, then currently we do not return an error
or clean-up afterwards. Although for root controllers, this failure may be
fatal anyway, for secondary controllers, it may not be fatal and so return
an error on failure and clean-up.

Update the functions gic_cpu_init() and gic_pm_init() to return an error
instead of calling BUG() and perform any necessary clean-up.

For non-banked GIC controllers, make sure that we free any memory
allocated if we fail to initialise the IRQ domain. Please note that
free_percpu() only frees memory if the pointer passed to it is not NULL
and so it is unnecessary to check if both pointers are valid or not.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Jon Hunter 2016-05-10 16:14:42 +01:00 committed by Marc Zyngier
parent c2baa2f3f4
commit dc9722cc57
1 changed files with 73 additions and 26 deletions
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99
drivers/irqchip/irq-gic.c
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@ -467,7 +467,7 @@ static void __init gic_dist_init(struct gic_chip_data *gic)
writel_relaxed(GICD_ENABLE, base + GIC_DIST_CTRL);
}
static void gic_cpu_init(struct gic_chip_data *gic)
static int gic_cpu_init(struct gic_chip_data *gic)
{
void __iomem *dist_base = gic_data_dist_base(gic);
void __iomem *base = gic_data_cpu_base(gic);
@ -483,7 +483,9 @@ static void gic_cpu_init(struct gic_chip_data *gic)
/*
* Get what the GIC says our CPU mask is.
*/
BUG_ON(cpu >= NR_GIC_CPU_IF);
if (WARN_ON(cpu >= NR_GIC_CPU_IF))
return -EINVAL;
cpu_mask = gic_get_cpumask(gic);
gic_cpu_map[cpu] = cpu_mask;
@ -500,6 +502,8 @@ static void gic_cpu_init(struct gic_chip_data *gic)
writel_relaxed(GICC_INT_PRI_THRESHOLD, base + GIC_CPU_PRIMASK);
gic_cpu_if_up(gic);
return 0;
}
int gic_cpu_if_down(unsigned int gic_nr)
@ -713,26 +717,39 @@ static struct notifier_block gic_notifier_block = {
.notifier_call = gic_notifier,
};
static void __init gic_pm_init(struct gic_chip_data *gic)
static int __init gic_pm_init(struct gic_chip_data *gic)
{
gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
sizeof(u32));
BUG_ON(!gic->saved_ppi_enable);
if (WARN_ON(!gic->saved_ppi_enable))
return -ENOMEM;
gic->saved_ppi_active = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
sizeof(u32));
BUG_ON(!gic->saved_ppi_active);
if (WARN_ON(!gic->saved_ppi_active))
goto free_ppi_enable;
gic->saved_ppi_conf = __alloc_percpu(DIV_ROUND_UP(32, 16) * 4,
sizeof(u32));
BUG_ON(!gic->saved_ppi_conf);
if (WARN_ON(!gic->saved_ppi_conf))
goto free_ppi_active;
if (gic == &gic_data[0])
cpu_pm_register_notifier(&gic_notifier_block);
return 0;
free_ppi_active:
free_percpu(gic->saved_ppi_active);
free_ppi_enable:
free_percpu(gic->saved_ppi_enable);
return -ENOMEM;
}
#else
static void __init gic_pm_init(struct gic_chip_data *gic)
static int __init gic_pm_init(struct gic_chip_data *gic)
{
return 0;
}
#endif
@ -1005,13 +1022,13 @@ static const struct irq_domain_ops gic_irq_domain_ops = {
.unmap = gic_irq_domain_unmap,
};
static void __init __gic_init_bases(unsigned int gic_nr, int irq_start,
static int __init __gic_init_bases(unsigned int gic_nr, int irq_start,
void __iomem *dist_base, void __iomem *cpu_base,
u32 percpu_offset, struct fwnode_handle *handle)
{
irq_hw_number_t hwirq_base;
struct gic_chip_data *gic;
int gic_irqs, irq_base, i;
int gic_irqs, irq_base, i, ret;
BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
@ -1026,7 +1043,7 @@ static void __init __gic_init_bases(unsigned int gic_nr, int irq_start,
gic->chip.irq_mask = gic_eoimode1_mask_irq;
gic->chip.irq_eoi = gic_eoimode1_eoi_irq;
gic->chip.irq_set_vcpu_affinity = gic_irq_set_vcpu_affinity;
gic->chip.name = "GICv2";
gic->chip.name = kasprintf(GFP_KERNEL, "GICv2");
} else {
gic->chip.name = kasprintf(GFP_KERNEL, "GIC-%d", gic_nr);
}
@ -1036,17 +1053,16 @@ static void __init __gic_init_bases(unsigned int gic_nr, int irq_start,
gic->chip.irq_set_affinity = gic_set_affinity;
#endif
#ifdef CONFIG_GIC_NON_BANKED
if (percpu_offset) { /* Frankein-GIC without banked registers... */
if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && percpu_offset) {
/* Frankein-GIC without banked registers... */
unsigned int cpu;
gic->dist_base.percpu_base = alloc_percpu(void __iomem *);
gic->cpu_base.percpu_base = alloc_percpu(void __iomem *);
if (WARN_ON(!gic->dist_base.percpu_base ||
!gic->cpu_base.percpu_base)) {
free_percpu(gic->dist_base.percpu_base);
free_percpu(gic->cpu_base.percpu_base);
return;
ret = -ENOMEM;
goto error;
}
for_each_possible_cpu(cpu) {
@ -1058,9 +1074,8 @@ static void __init __gic_init_bases(unsigned int gic_nr, int irq_start,
}
gic_set_base_accessor(gic, gic_get_percpu_base);
} else
#endif
{ /* Normal, sane GIC... */
} else {
/* Normal, sane GIC... */
WARN(percpu_offset,
"GIC_NON_BANKED not enabled, ignoring %08x offset!",
percpu_offset);
@ -1110,8 +1125,10 @@ static void __init __gic_init_bases(unsigned int gic_nr, int irq_start,
hwirq_base, &gic_irq_domain_ops, gic);
}
if (WARN_ON(!gic->domain))
return;
if (WARN_ON(!gic->domain)) {
ret = -ENODEV;
goto error;
}
if (gic_nr == 0) {
/*
@ -1131,8 +1148,25 @@ static void __init __gic_init_bases(unsigned int gic_nr, int irq_start,
}
gic_dist_init(gic);
gic_cpu_init(gic);
gic_pm_init(gic);
ret = gic_cpu_init(gic);
if (ret)
goto error;
ret = gic_pm_init(gic);
if (ret)
goto error;
return 0;
error:
if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && percpu_offset) {
free_percpu(gic->dist_base.percpu_base);
free_percpu(gic->cpu_base.percpu_base);
}
kfree(gic->chip.name);
return ret;
}
void __init gic_init(unsigned int gic_nr, int irq_start,
@ -1193,7 +1227,7 @@ gic_of_init(struct device_node *node, struct device_node *parent)
void __iomem *cpu_base;
void __iomem *dist_base;
u32 percpu_offset;
int irq;
int irq, ret;
if (WARN_ON(!node))
return -ENODEV;
@ -1218,8 +1252,14 @@ gic_of_init(struct device_node *node, struct device_node *parent)
if (of_property_read_u32(node, "cpu-offset", &percpu_offset))
percpu_offset = 0;
__gic_init_bases(gic_cnt, -1, dist_base, cpu_base, percpu_offset,
ret = __gic_init_bases(gic_cnt, -1, dist_base, cpu_base, percpu_offset,
&node->fwnode);
if (ret) {
iounmap(dist_base);
iounmap(cpu_base);
return ret;
}
if (!gic_cnt)
gic_init_physaddr(node);
@ -1308,7 +1348,7 @@ static int __init gic_v2_acpi_init(struct acpi_subtable_header *header,
struct acpi_madt_generic_distributor *dist;
void __iomem *cpu_base, *dist_base;
struct fwnode_handle *domain_handle;
int count;
int count, ret;
/* Collect CPU base addresses */
count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
@ -1351,7 +1391,14 @@ static int __init gic_v2_acpi_init(struct acpi_subtable_header *header,
return -ENOMEM;
}
__gic_init_bases(0, -1, dist_base, cpu_base, 0, domain_handle);
ret = __gic_init_bases(0, -1, dist_base, cpu_base, 0, domain_handle);
if (ret) {
pr_err("Failed to initialise GIC\n");
irq_domain_free_fwnode(domain_handle);
iounmap(cpu_base);
iounmap(dist_base);
return ret;
}
acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle);