- 根目录:
- drivers
- irqchip
- irq-gic.c
/*
* Copyright (C) 2002 ARM Limited, All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Interrupt architecture for the GIC:
*
* o There is one Interrupt Distributor, which receives interrupts
* from system devices and sends them to the Interrupt Controllers.
*
* o There is one CPU Interface per CPU, which sends interrupts sent
* by the Distributor, and interrupts generated locally, to the
* associated CPU. The base address of the CPU interface is usually
* aliased so that the same address points to different chips depending
* on the CPU it is accessed from.
*
* Note that IRQs 0-31 are special - they are local to each CPU.
* As such, the enable set/clear, pending set/clear and active bit
* registers are banked per-cpu for these sources.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/smp.h>
#include <linux/cpu.h>
#include <linux/cpu_pm.h>
#include <linux/cpumask.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/acpi.h>
#include <linux/irqdomain.h>
#include <linux/interrupt.h>
#include <linux/percpu.h>
#include <linux/slab.h>
#include <linux/irqchip.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqchip/arm-gic.h>
#include <asm/cputype.h>
#include <asm/irq.h>
#include <asm/exception.h>
#include <asm/smp_plat.h>
#include <asm/virt.h>
#include "irq-gic-common.h"
#ifdef CONFIG_ARM64
#include <asm/cpufeature.h>
static void gic_check_cpu_features(void)
{
WARN_TAINT_ONCE(cpus_have_cap(ARM64_HAS_SYSREG_GIC_CPUIF),
TAINT_CPU_OUT_OF_SPEC,
"GICv3 system registers enabled, broken firmware!\n");
}
#else
#define gic_check_cpu_features() do { } while(0)
#endif
union gic_base {
void __iomem *common_base;
void __percpu * __iomem *percpu_base;
};
struct gic_chip_data {
union gic_base dist_base;
union gic_base cpu_base;
#ifdef CONFIG_CPU_PM
u32 saved_spi_enable[DIV_ROUND_UP(1020, 32)];
u32 saved_spi_active[DIV_ROUND_UP(1020, 32)];
u32 saved_spi_conf[DIV_ROUND_UP(1020, 16)];
u32 saved_spi_target[DIV_ROUND_UP(1020, 4)];
u32 __percpu *saved_ppi_enable;
u32 __percpu *saved_ppi_active;
u32 __percpu *saved_ppi_conf;
#endif
struct irq_domain *domain;
unsigned int gic_irqs;
#ifdef CONFIG_GIC_NON_BANKED
void __iomem *(*get_base)(union gic_base *);
#endif
};
static DEFINE_RAW_SPINLOCK(irq_controller_lock);
/*
* The GIC mapping of CPU interfaces does not necessarily match
* the logical CPU numbering. Let's use a mapping as returned
* by the GIC itself.
*/
#define NR_GIC_CPU_IF 8
static u8 gic_cpu_map[NR_GIC_CPU_IF] __read_mostly;
static struct static_key supports_deactivate = STATIC_KEY_INIT_TRUE;
#ifndef MAX_GIC_NR
#define MAX_GIC_NR 1
#endif
static struct gic_chip_data gic_data[MAX_GIC_NR] __read_mostly;
#ifdef CONFIG_GIC_NON_BANKED
static void __iomem *gic_get_percpu_base(union gic_base *base)
{
return raw_cpu_read(*base->percpu_base);
}
static void __iomem *gic_get_common_base(union gic_base *base)
{
return base->common_base;
}
static inline void __iomem *gic_data_dist_base(struct gic_chip_data *data)
{
return data->get_base(&data->dist_base);
}
static inline void __iomem *gic_data_cpu_base(struct gic_chip_data *data)
{
return data->get_base(&data->cpu_base);
}
static inline void gic_set_base_accessor(struct gic_chip_data *data,
void __iomem *(*f)(union gic_base *))
{
data->get_base = f;
}
#else
#define gic_data_dist_base(d) ((d)->dist_base.common_base)
#define gic_data_cpu_base(d) ((d)->cpu_base.common_base)
#define gic_set_base_accessor(d, f)
#endif
static inline void __iomem *gic_dist_base(struct irq_data *d)
{
struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
return gic_data_dist_base(gic_data);
}
static inline void __iomem *gic_cpu_base(struct irq_data *d)
{
struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
return gic_data_cpu_base(gic_data);
}
static inline unsigned int gic_irq(struct irq_data *d)
{
return d->hwirq;
}
static inline bool cascading_gic_irq(struct irq_data *d)
{
void *data = irq_data_get_irq_handler_data(d);
/*
* If handler_data is set, this is a cascading interrupt, and
* it cannot possibly be forwarded.
*/
return data != NULL;
}
/*
* Routines to acknowledge, disable and enable interrupts
*/
static void gic_poke_irq(struct irq_data *d, u32 offset)
{
u32 mask = 1 << (gic_irq(d) % 32);
writel_relaxed(mask, gic_dist_base(d) + offset + (gic_irq(d) / 32) * 4);
}
static int gic_peek_irq(struct irq_data *d, u32 offset)
{
u32 mask = 1 << (gic_irq(d) % 32);
return !!(readl_relaxed(gic_dist_base(d) + offset + (gic_irq(d) / 32) * 4) & mask);
}
static void gic_mask_irq(struct irq_data *d)
{
gic_poke_irq(d, GIC_DIST_ENABLE_CLEAR);
}
static void gic_eoimode1_mask_irq(struct irq_data *d)
{
gic_mask_irq(d);
/*
* When masking a forwarded interrupt, make sure it is
* deactivated as well.
*
* This ensures that an interrupt that is getting
* disabled/masked will not get "stuck", because there is
* noone to deactivate it (guest is being terminated).
*/
if (irqd_is_forwarded_to_vcpu(d))
gic_poke_irq(d, GIC_DIST_ACTIVE_CLEAR);
}
static void gic_unmask_irq(struct irq_data *d)
{
gic_poke_irq(d, GIC_DIST_ENABLE_SET);
}
static void gic_eoi_irq(struct irq_data *d)
{
writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_EOI);
}
static void gic_eoimode1_eoi_irq(struct irq_data *d)
{
/* Do not deactivate an IRQ forwarded to a vcpu. */
if (irqd_is_forwarded_to_vcpu(d))
return;
writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_DEACTIVATE);
}
static int gic_irq_set_irqchip_state(struct irq_data *d,
enum irqchip_irq_state which, bool val)
{
u32 reg;
switch (which) {
case IRQCHIP_STATE_PENDING:
reg = val ? GIC_DIST_PENDING_SET : GIC_DIST_PENDING_CLEAR;
break;
case IRQCHIP_STATE_ACTIVE:
reg = val ? GIC_DIST_ACTIVE_SET : GIC_DIST_ACTIVE_CLEAR;
break;
case IRQCHIP_STATE_MASKED:
reg = val ? GIC_DIST_ENABLE_CLEAR : GIC_DIST_ENABLE_SET;
break;
default:
return -EINVAL;
}
gic_poke_irq(d, reg);
return 0;
}
static int gic_irq_get_irqchip_state(struct irq_data *d,
enum irqchip_irq_state which, bool *val)
{
switch (which) {
case IRQCHIP_STATE_PENDING:
*val = gic_peek_irq(d, GIC_DIST_PENDING_SET);
break;
case IRQCHIP_STATE_ACTIVE:
*val = gic_peek_irq(d, GIC_DIST_ACTIVE_SET);
break;
case IRQCHIP_STATE_MASKED:
*val = !gic_peek_irq(d, GIC_DIST_ENABLE_SET);
break;
default:
return -EINVAL;
}
return 0;
}
static int gic_set_type(struct irq_data *d, unsigned int type)
{
void __iomem *base = gic_dist_base(d);
unsigned int gicirq = gic_irq(d);
/* Interrupt configuration for SGIs can't be changed */
if (gicirq < 16)
return -EINVAL;
/* SPIs have restrictions on the supported types */
if (gicirq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
type != IRQ_TYPE_EDGE_RISING)
return -EINVAL;
return gic_configure_irq(gicirq, type, base, NULL);
}
static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu)
{
/* Only interrupts on the primary GIC can be forwarded to a vcpu. */
if (cascading_gic_irq(d))
return -EINVAL;
if (vcpu)
irqd_set_forwarded_to_vcpu(d);
else
irqd_clr_forwarded_to_vcpu(d);
return 0;
}
#ifdef CONFIG_SMP
static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
bool force)
{
void __iomem *reg = gic_dist_base(d) + GIC_DIST_TARGET + (gic_irq(d) & ~3);
unsigned int cpu, shift = (gic_irq(d) % 4) * 8;
u32 val, mask, bit;
unsigned long flags;
if (!force)
cpu = cpumask_any_and(mask_val, cpu_online_mask);
else
cpu = cpumask_first(mask_val);
if (cpu >= NR_GIC_CPU_IF || cpu >= nr_cpu_ids)
return -EINVAL;
raw_spin_lock_irqsave(&irq_controller_lock, flags);
mask = 0xff << shift;
bit = gic_cpu_map[cpu] << shift;
val = readl_relaxed(reg) & ~mask;
writel_relaxed(val | bit, reg);
raw_spin_unlock_irqrestore(&irq_controller_lock, flags);
return IRQ_SET_MASK_OK;
}
#endif
static void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
{
u32 irqstat, irqnr;
struct gic_chip_data *gic = &gic_data[0];
void __iomem *cpu_base = gic_data_cpu_base(gic);
do {
irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK);
irqnr = irqstat & GICC_IAR_INT_ID_MASK;
if (likely(irqnr > 15 && irqnr < 1021)) {
if (static_key_true(&supports_deactivate))
writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
handle_domain_irq(gic->domain, irqnr, regs);
continue;
}
if (irqnr < 16) {
writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
if (static_key_true(&supports_deactivate))
writel_relaxed(irqstat, cpu_base + GIC_CPU_DEACTIVATE);
#ifdef CONFIG_SMP
handle_IPI(irqnr, regs);
#endif
continue;
}
break;
} while (1);
}
static void gic_handle_cascade_irq(struct irq_desc *desc)
{
struct gic_chip_data *chip_data = irq_desc_get_handler_data(desc);
struct irq_chip *chip = irq_desc_get_chip(desc);
unsigned int cascade_irq, gic_irq;
unsigned long status;
chained_irq_enter(chip, desc);
raw_spin_lock(&irq_controller_lock);
status = readl_relaxed(gic_data_cpu_base(chip_data) + GIC_CPU_INTACK);
raw_spin_unlock(&irq_controller_lock);
gic_irq = (status & GICC_IAR_INT_ID_MASK);
if (gic_irq == GICC_INT_SPURIOUS)
goto out;
cascade_irq = irq_find_mapping(chip_data->domain, gic_irq);
if (unlikely(gic_irq < 32 || gic_irq > 1020))
handle_bad_irq(desc);
else
generic_handle_irq(cascade_irq);
out:
chained_irq_exit(chip, desc);
}
static struct irq_chip gic_chip = {
.name = "GIC",
.irq_mask = gic_mask_irq,
.irq_unmask = gic_unmask_irq,
.irq_eoi = gic_eoi_irq,
.irq_set_type = gic_set_type,
#ifdef CONFIG_SMP
.irq_set_affinity = gic_set_affinity,
#endif
.irq_get_irqchip_state = gic_irq_get_irqchip_state,
.irq_set_irqchip_state = gic_irq_set_irqchip_state,
.flags = IRQCHIP_SET_TYPE_MASKED |
IRQCHIP_SKIP_SET_WAKE |
IRQCHIP_MASK_ON_SUSPEND,
};
static struct irq_chip gic_eoimode1_chip = {
.name = "GICv2",
.irq_mask = gic_eoimode1_mask_irq,
.irq_unmask = gic_unmask_irq,
.irq_eoi = gic_eoimode1_eoi_irq,
.irq_set_type = gic_set_type,
#ifdef CONFIG_SMP
.irq_set_affinity = gic_set_affinity,
#endif
.irq_get_irqchip_state = gic_irq_get_irqchip_state,
.irq_set_irqchip_state = gic_irq_set_irqchip_state,
.irq_set_vcpu_affinity = gic_irq_set_vcpu_affinity,
.flags = IRQCHIP_SET_TYPE_MASKED |
IRQCHIP_SKIP_SET_WAKE |
IRQCHIP_MASK_ON_SUSPEND,
};
void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq)
{
if (gic_nr >= MAX_GIC_NR)
BUG();
irq_set_chained_handler_and_data(irq, gic_handle_cascade_irq,
&gic_data[gic_nr]);
}
static u8 gic_get_cpumask(struct gic_chip_data *gic)
{
void __iomem *base = gic_data_dist_base(gic);
u32 mask, i;
for (i = mask = 0; i < 32; i += 4) {
mask = readl_relaxed(base + GIC_DIST_TARGET + i);
mask |= mask >> 16;
mask |= mask >> 8;
if (mask)
break;
}
if (!mask && num_possible_cpus() > 1)
pr_crit("GIC CPU mask not found - kernel will fail to boot.\n");
return mask;
}
static void gic_cpu_if_up(struct gic_chip_data *gic)
{
void __iomem *cpu_base = gic_data_cpu_base(gic);
u32 bypass = 0;
u32 mode = 0;
if (static_key_true(&supports_deactivate))
mode = GIC_CPU_CTRL_EOImodeNS;
/*
* Preserve bypass disable bits to be written back later
*/
bypass = readl(cpu_base + GIC_CPU_CTRL);
bypass &= GICC_DIS_BYPASS_MASK;
writel_relaxed(bypass | mode | GICC_ENABLE, cpu_base + GIC_CPU_CTRL);
}
static void __init gic_dist_init(struct gic_chip_data *gic)
{
unsigned int i;
u32 cpumask;
unsigned int gic_irqs = gic->gic_irqs;
void __iomem *base = gic_data_dist_base(gic);
writel_relaxed(GICD_DISABLE, base + GIC_DIST_CTRL);
/*
* Set all global interrupts to this CPU only.
*/
cpumask = gic_get_cpumask(gic);
cpumask |= cpumask << 8;
cpumask |= cpumask << 16;
for (i = 32; i < gic_irqs; i += 4)
writel_relaxed(cpumask, base + GIC_DIST_TARGET + i * 4 / 4);
gic_dist_config(base, gic_irqs, NULL);
writel_relaxed(GICD_ENABLE, base + GIC_DIST_CTRL);
}
static void 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);
unsigned int cpu_mask, cpu = smp_processor_id();
int i;
/*
* Setting up the CPU map is only relevant for the primary GIC
* because any nested/secondary GICs do not directly interface
* with the CPU(s).
*/
if (gic == &gic_data[0]) {
/*
* Get what the GIC says our CPU mask is.
*/
BUG_ON(cpu >= NR_GIC_CPU_IF);
cpu_mask = gic_get_cpumask(gic);
gic_cpu_map[cpu] = cpu_mask;
/*
* Clear our mask from the other map entries in case they're
* still undefined.
*/
for (i = 0; i < NR_GIC_CPU_IF; i++)
if (i != cpu)
gic_cpu_map[i] &= ~cpu_mask;
}
gic_cpu_config(dist_base, NULL);
writel_relaxed(GICC_INT_PRI_THRESHOLD, base + GIC_CPU_PRIMASK);
gic_cpu_if_up(gic);
}
int gic_cpu_if_down(unsigned int gic_nr)
{
void __iomem *cpu_base;
u32 val = 0;
if (gic_nr >= MAX_GIC_NR)
return -EINVAL;
cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
val = readl(cpu_base + GIC_CPU_CTRL);
val &= ~GICC_ENABLE;
writel_relaxed(val, cpu_base + GIC_CPU_CTRL);
return 0;
}
#ifdef CONFIG_CPU_PM
/*
* Saves the GIC distributor registers during suspend or idle. Must be called
* with interrupts disabled but before powering down the GIC. After calling
* this function, no interrupts will be delivered by the GIC, and another
* platform-specific wakeup source must be enabled.
*/
static void gic_dist_save(unsigned int gic_nr)
{
unsigned int gic_irqs;
void __iomem *dist_base;
int i;
if (gic_nr >= MAX_GIC_NR)
BUG();
gic_irqs = gic_data[gic_nr].gic_irqs;
dist_base = gic_data_dist_base(&gic_data[gic_nr]);
if (!dist_base)
return;
for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
gic_data[gic_nr].saved_spi_conf[i] =
readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
gic_data[gic_nr].saved_spi_target[i] =
readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
gic_data[gic_nr].saved_spi_enable[i] =
readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
gic_data[gic_nr].saved_spi_active[i] =
readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4);
}
/*
* Restores the GIC distributor registers during resume or when coming out of
* idle. Must be called before enabling interrupts. If a level interrupt
* that occured while the GIC was suspended is still present, it will be
* handled normally, but any edge interrupts that occured will not be seen by
* the GIC and need to be handled by the platform-specific wakeup source.
*/
static void gic_dist_restore(unsigned int gic_nr)
{
unsigned int gic_irqs;
unsigned int i;
void __iomem *dist_base;
if (gic_nr >= MAX_GIC_NR)
BUG();
gic_irqs = gic_data[gic_nr].gic_irqs;
dist_base = gic_data_dist_base(&gic_data[gic_nr]);
if (!dist_base)
return;
writel_relaxed(GICD_DISABLE, dist_base + GIC_DIST_CTRL);
for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
writel_relaxed(gic_data[gic_nr].saved_spi_conf[i],
dist_base + GIC_DIST_CONFIG + i * 4);
for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
writel_relaxed(GICD_INT_DEF_PRI_X4,
dist_base + GIC_DIST_PRI + i * 4);
for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
writel_relaxed(gic_data[gic_nr].saved_spi_target[i],
dist_base + GIC_DIST_TARGET + i * 4);
for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) {
writel_relaxed(GICD_INT_EN_CLR_X32,
dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
writel_relaxed(gic_data[gic_nr].saved_spi_enable[i],
dist_base + GIC_DIST_ENABLE_SET + i * 4);
}
for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) {
writel_relaxed(GICD_INT_EN_CLR_X32,
dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4);
writel_relaxed(gic_data[gic_nr].saved_spi_active[i],
dist_base + GIC_DIST_ACTIVE_SET + i * 4);
}
writel_relaxed(GICD_ENABLE, dist_base + GIC_DIST_CTRL);
}
static void gic_cpu_save(unsigned int gic_nr)
{
int i;
u32 *ptr;
void __iomem *dist_base;
void __iomem *cpu_base;
if (gic_nr >= MAX_GIC_NR)
BUG();
dist_base = gic_data_dist_base(&gic_data[gic_nr]);
cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
if (!dist_base || !cpu_base)
return;
ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_enable);
for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
ptr[i] = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_active);
for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
ptr[i] = readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4);
ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_conf);
for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
ptr[i] = readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
}
static void gic_cpu_restore(unsigned int gic_nr)
{
int i;
u32 *ptr;
void __iomem *dist_base;
void __iomem *cpu_base;
if (gic_nr >= MAX_GIC_NR)
BUG();
dist_base = gic_data_dist_base(&gic_data[gic_nr]);
cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
if (!dist_base || !cpu_base)
return;
ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_enable);
for (i = 0; i < DIV_ROUND_UP(32, 32); i++) {
writel_relaxed(GICD_INT_EN_CLR_X32,
dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
writel_relaxed(ptr[i], dist_base + GIC_DIST_ENABLE_SET + i * 4);
}
ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_active);
for (i = 0; i < DIV_ROUND_UP(32, 32); i++) {
writel_relaxed(GICD_INT_EN_CLR_X32,
dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4);
writel_relaxed(ptr[i], dist_base + GIC_DIST_ACTIVE_SET + i * 4);
}
ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_conf);
for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
writel_relaxed(ptr[i], dist_base + GIC_DIST_CONFIG + i * 4);
for (i = 0; i < DIV_ROUND_UP(32, 4); i++)
writel_relaxed(GICD_INT_DEF_PRI_X4,
dist_base + GIC_DIST_PRI + i * 4);
writel_relaxed(GICC_INT_PRI_THRESHOLD, cpu_base + GIC_CPU_PRIMASK);
gic_cpu_if_up(&gic_data[gic_nr]);
}
static int gic_notifier(struct notifier_block *self, unsigned long cmd, void *v)
{
int i;
for (i = 0; i < MAX_GIC_NR; i++) {
#ifdef CONFIG_GIC_NON_BANKED
/* Skip over unused GICs */
if (!gic_data[i].get_base)
continue;
#endif
switch (cmd) {
case CPU_PM_ENTER:
gic_cpu_save(i);
break;
case CPU_PM_ENTER_FAILED:
case CPU_PM_EXIT:
gic_cpu_restore(i);
break;
case CPU_CLUSTER_PM_ENTER:
gic_dist_save(i);
break;
case CPU_CLUSTER_PM_ENTER_FAILED:
case CPU_CLUSTER_PM_EXIT:
gic_dist_restore(i);
break;
}
}
return NOTIFY_OK;
}
static struct notifier_block gic_notifier_block = {
.notifier_call = gic_notifier,
};
static void __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);
gic->saved_ppi_active = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
sizeof(u32));
BUG_ON(!gic->saved_ppi_active);
gic->saved_ppi_conf = __alloc_percpu(DIV_ROUND_UP(32, 16) * 4,
sizeof(u32));
BUG_ON(!gic->saved_ppi_conf);
if (gic == &gic_data[0])
cpu_pm_register_notifier(&gic_notifier_block);
}
#else
static void __init gic_pm_init(struct gic_chip_data *gic)
{
}
#endif
#ifdef CONFIG_SMP
static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
{
int cpu;
unsigned long flags, map = 0;
raw_spin_lock_irqsave(&irq_controller_lock, flags);
/* Convert our logical CPU mask into a physical one. */
for_each_cpu(cpu, mask)
map |= gic_cpu_map[cpu];
/*
* Ensure that stores to Normal memory are visible to the
* other CPUs before they observe us issuing the IPI.
*/
dmb(ishst);
/* this always happens on GIC0 */
writel_relaxed(map << 16 | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
raw_spin_unlock_irqrestore(&irq_controller_lock, flags);
}
#endif
#ifdef CONFIG_BL_SWITCHER
/*
* gic_send_sgi - send a SGI directly to given CPU interface number
*
* cpu_id: the ID for the destination CPU interface
* irq: the IPI number to send a SGI for
*/
void gic_send_sgi(unsigned int cpu_id, unsigned int irq)
{
BUG_ON(cpu_id >= NR_GIC_CPU_IF);
cpu_id = 1 << cpu_id;
/* this always happens on GIC0 */
writel_relaxed((cpu_id << 16) | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
}
/*
* gic_get_cpu_id - get the CPU interface ID for the specified CPU
*
* @cpu: the logical CPU number to get the GIC ID for.
*
* Return the CPU interface ID for the given logical CPU number,
* or -1 if the CPU number is too large or the interface ID is
* unknown (more than one bit set).
*/
int gic_get_cpu_id(unsigned int cpu)
{
unsigned int cpu_bit;
if (cpu >= NR_GIC_CPU_IF)
return -1;
cpu_bit = gic_cpu_map[cpu];
if (cpu_bit & (cpu_bit - 1))
return -1;
return __ffs(cpu_bit);
}
/*
* gic_migrate_target - migrate IRQs to another CPU interface
*
* @new_cpu_id: the CPU target ID to migrate IRQs to
*
* Migrate all peripheral interrupts with a target matching the current CPU
* to the interface corresponding to @new_cpu_id. The CPU interface mapping
* is also updated. Targets to other CPU interfaces are unchanged.
* This must be called with IRQs locally disabled.
*/
void gic_migrate_target(unsigned int new_cpu_id)
{
unsigned int cur_cpu_id, gic_irqs, gic_nr = 0;
void __iomem *dist_base;
int i, ror_val, cpu = smp_processor_id();
u32 val, cur_target_mask, active_mask;
if (gic_nr >= MAX_GIC_NR)
BUG();
dist_base = gic_data_dist_base(&gic_data[gic_nr]);
if (!dist_base)
return;
gic_irqs = gic_data[gic_nr].gic_irqs;
cur_cpu_id = __ffs(gic_cpu_map[cpu]);
cur_target_mask = 0x01010101 << cur_cpu_id;
ror_val = (cur_cpu_id - new_cpu_id) & 31;
raw_spin_lock(&irq_controller_lock);
/* Update the target interface for this logical CPU */
gic_cpu_map[cpu] = 1 << new_cpu_id;
/*
* Find all the peripheral interrupts targetting the current
* CPU interface and migrate them to the new CPU interface.
* We skip DIST_TARGET 0 to 7 as they are read-only.
*/
for (i = 8; i < DIV_ROUND_UP(gic_irqs, 4); i++) {
val = readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
active_mask = val & cur_target_mask;
if (active_mask) {
val &= ~active_mask;
val |= ror32(active_mask, ror_val);
writel_relaxed(val, dist_base + GIC_DIST_TARGET + i*4);
}
}
raw_spin_unlock(&irq_controller_lock);
/*
* Now let's migrate and clear any potential SGIs that might be
* pending for us (cur_cpu_id). Since GIC_DIST_SGI_PENDING_SET
* is a banked register, we can only forward the SGI using
* GIC_DIST_SOFTINT. The original SGI source is lost but Linux
* doesn't use that information anyway.
*
* For the same reason we do not adjust SGI source information
* for previously sent SGIs by us to other CPUs either.
*/
for (i = 0; i < 16; i += 4) {
int j;
val = readl_relaxed(dist_base + GIC_DIST_SGI_PENDING_SET + i);
if (!val)
continue;
writel_relaxed(val, dist_base + GIC_DIST_SGI_PENDING_CLEAR + i);
for (j = i; j < i + 4; j++) {
if (val & 0xff)
writel_relaxed((1 << (new_cpu_id + 16)) | j,
dist_base + GIC_DIST_SOFTINT);
val >>= 8;
}
}
}
/*
* gic_get_sgir_physaddr - get the physical address for the SGI register
*
* REturn the physical address of the SGI register to be used
* by some early assembly code when the kernel is not yet available.
*/
static unsigned long gic_dist_physaddr;
unsigned long gic_get_sgir_physaddr(void)
{
if (!gic_dist_physaddr)
return 0;
return gic_dist_physaddr + GIC_DIST_SOFTINT;
}
void __init gic_init_physaddr(struct device_node *node)
{
struct resource res;
if (of_address_to_resource(node, 0, &res) == 0) {
gic_dist_physaddr = res.start;
pr_info("GIC physical location is %#lx\n", gic_dist_physaddr);
}
}
#else
#define gic_init_physaddr(node) do { } while (0)
#endif
static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
irq_hw_number_t hw)
{
struct irq_chip *chip = &gic_chip;
if (static_key_true(&supports_deactivate)) {
if (d->host_data == (void *)&gic_data[0])
chip = &gic_eoimode1_chip;
}
if (hw < 32) {
irq_set_percpu_devid(irq);
irq_domain_set_info(d, irq, hw, chip, d->host_data,
handle_percpu_devid_irq, NULL, NULL);
irq_set_status_flags(irq, IRQ_NOAUTOEN);
} else {
irq_domain_set_info(d, irq, hw, chip, d->host_data,
handle_fasteoi_irq, NULL, NULL);
irq_set_probe(irq);
}
return 0;
}
static void gic_irq_domain_unmap(struct irq_domain *d, unsigned int irq)
{
}
static int gic_irq_domain_translate(struct irq_domain *d,
struct irq_fwspec *fwspec,
unsigned long *hwirq,
unsigned int *type)
{
if (is_of_node(fwspec->fwnode)) {
if (fwspec->param_count < 3)
return -EINVAL;
/* Get the interrupt number and add 16 to skip over SGIs */
*hwirq = fwspec->param[1] + 16;
/*
* For SPIs, we need to add 16 more to get the GIC irq
* ID number
*/
if (!fwspec->param[0])
*hwirq += 16;
*type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
return 0;
}
if (fwspec->fwnode->type == FWNODE_IRQCHIP) {
if(fwspec->param_count != 2)
return -EINVAL;
*hwirq = fwspec->param[0];
*type = fwspec->param[1];
return 0;
}
return -EINVAL;
}
#ifdef CONFIG_SMP
static int gic_secondary_init(struct notifier_block *nfb, unsigned long action,
void *hcpu)
{
if (action == CPU_STARTING || action == CPU_STARTING_FROZEN)
gic_cpu_init(&gic_data[0]);
return NOTIFY_OK;
}
/*
* Notifier for enabling the GIC CPU interface. Set an arbitrarily high
* priority because the GIC needs to be up before the ARM generic timers.
*/
static struct notifier_block gic_cpu_notifier = {
.notifier_call = gic_secondary_init,
.priority = 100,
};
#endif
static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs, void *arg)
{
int i, ret;
irq_hw_number_t hwirq;
unsigned int type = IRQ_TYPE_NONE;
struct irq_fwspec *fwspec = arg;
ret = gic_irq_domain_translate(domain, fwspec, &hwirq, &type);
if (ret)
return ret;
for (i = 0; i < nr_irqs; i++)
gic_irq_domain_map(domain, virq + i, hwirq + i);
return 0;
}
static const struct irq_domain_ops gic_irq_domain_hierarchy_ops = {
.translate = gic_irq_domain_translate,
.alloc = gic_irq_domain_alloc,
.free = irq_domain_free_irqs_top,
};
static const struct irq_domain_ops gic_irq_domain_ops = {
.map = gic_irq_domain_map,
.unmap = gic_irq_domain_unmap,
};
static void __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;
BUG_ON(gic_nr >= MAX_GIC_NR);
gic_check_cpu_features();
gic = &gic_data[gic_nr];
#ifdef CONFIG_GIC_NON_BANKED
if (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;
}
for_each_possible_cpu(cpu) {
u32 mpidr = cpu_logical_map(cpu);
u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
unsigned long offset = percpu_offset * core_id;
*per_cpu_ptr(gic->dist_base.percpu_base, cpu) = dist_base + offset;
*per_cpu_ptr(gic->cpu_base.percpu_base, cpu) = cpu_base + offset;
}
gic_set_base_accessor(gic, gic_get_percpu_base);
} else
#endif
{ /* Normal, sane GIC... */
WARN(percpu_offset,
"GIC_NON_BANKED not enabled, ignoring %08x offset!",
percpu_offset);
gic->dist_base.common_base = dist_base;
gic->cpu_base.common_base = cpu_base;
gic_set_base_accessor(gic, gic_get_common_base);
}
/*
* Find out how many interrupts are supported.
* The GIC only supports up to 1020 interrupt sources.
*/
gic_irqs = readl_relaxed(gic_data_dist_base(gic) + GIC_DIST_CTR) & 0x1f;
gic_irqs = (gic_irqs + 1) * 32;
if (gic_irqs > 1020)
gic_irqs = 1020;
gic->gic_irqs = gic_irqs;
if (handle) { /* DT/ACPI */
gic->domain = irq_domain_create_linear(handle, gic_irqs,
&gic_irq_domain_hierarchy_ops,
gic);
} else { /* Legacy support */
/*
* For primary GICs, skip over SGIs.
* For secondary GICs, skip over PPIs, too.
*/
if (gic_nr == 0 && (irq_start & 31) > 0) {
hwirq_base = 16;
if (irq_start != -1)
irq_start = (irq_start & ~31) + 16;
} else {
hwirq_base = 32;
}
gic_irqs -= hwirq_base; /* calculate # of irqs to allocate */
irq_base = irq_alloc_descs(irq_start, 16, gic_irqs,
numa_node_id());
if (IS_ERR_VALUE(irq_base)) {
WARN(1, "Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
irq_start);
irq_base = irq_start;
}
gic->domain = irq_domain_add_legacy(NULL, gic_irqs, irq_base,
hwirq_base, &gic_irq_domain_ops, gic);
}
if (WARN_ON(!gic->domain))
return;
if (gic_nr == 0) {
/*
* Initialize the CPU interface map to all CPUs.
* It will be refined as each CPU probes its ID.
* This is only necessary for the primary GIC.
*/
for (i = 0; i < NR_GIC_CPU_IF; i++)
gic_cpu_map[i] = 0xff;
#ifdef CONFIG_SMP
set_smp_cross_call(gic_raise_softirq);
register_cpu_notifier(&gic_cpu_notifier);
#endif
set_handle_irq(gic_handle_irq);
if (static_key_true(&supports_deactivate))
pr_info("GIC: Using split EOI/Deactivate mode\n");
}
gic_dist_init(gic);
gic_cpu_init(gic);
gic_pm_init(gic);
}
void __init gic_init(unsigned int gic_nr, int irq_start,
void __iomem *dist_base, void __iomem *cpu_base)
{
/*
* Non-DT/ACPI systems won't run a hypervisor, so let's not
* bother with these...
*/
static_key_slow_dec(&supports_deactivate);
__gic_init_bases(gic_nr, irq_start, dist_base, cpu_base, 0, NULL);
}
#ifdef CONFIG_OF
static int gic_cnt __initdata;
static bool gic_check_eoimode(struct device_node *node, void __iomem **base)
{
struct resource cpuif_res;
of_address_to_resource(node, 1, &cpuif_res);
if (!is_hyp_mode_available())
return false;
if (resource_size(&cpuif_res) < SZ_8K)
return false;
if (resource_size(&cpuif_res) == SZ_128K) {
u32 val_low, val_high;
/*
* Verify that we have the first 4kB of a GIC400
* aliased over the first 64kB by checking the
* GICC_IIDR register on both ends.
*/
val_low = readl_relaxed(*base + GIC_CPU_IDENT);
val_high = readl_relaxed(*base + GIC_CPU_IDENT + 0xf000);
if ((val_low & 0xffff0fff) != 0x0202043B ||
val_low != val_high)
return false;
/*
* Move the base up by 60kB, so that we have a 8kB
* contiguous region, which allows us to use GICC_DIR
* at its normal offset. Please pass me that bucket.
*/
*base += 0xf000;
cpuif_res.start += 0xf000;
pr_warn("GIC: Adjusting CPU interface base to %pa",
&cpuif_res.start);
}
return true;
}
static int __init
gic_of_init(struct device_node *node, struct device_node *parent)
{
void __iomem *cpu_base;
void __iomem *dist_base;
u32 percpu_offset;
int irq;
if (WARN_ON(!node))
return -ENODEV;
dist_base = of_iomap(node, 0);
WARN(!dist_base, "unable to map gic dist registers\n");
cpu_base = of_iomap(node, 1);
WARN(!cpu_base, "unable to map gic cpu registers\n");
/*
* Disable split EOI/Deactivate if either HYP is not available
* or the CPU interface is too small.
*/
if (gic_cnt == 0 && !gic_check_eoimode(node, &cpu_base))
static_key_slow_dec(&supports_deactivate);
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,
&node->fwnode);
if (!gic_cnt)
gic_init_physaddr(node);
if (parent) {
irq = irq_of_parse_and_map(node, 0);
gic_cascade_irq(gic_cnt, irq);
}
if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
gicv2m_of_init(node, gic_data[gic_cnt].domain);
gic_cnt++;
return 0;
}
IRQCHIP_DECLARE(gic_400, "arm,gic-400", gic_of_init);
IRQCHIP_DECLARE(arm11mp_gic, "arm,arm11mp-gic", gic_of_init);
IRQCHIP_DECLARE(arm1176jzf_dc_gic, "arm,arm1176jzf-devchip-gic", gic_of_init);
IRQCHIP_DECLARE(cortex_a15_gic, "arm,cortex-a15-gic", gic_of_init);
IRQCHIP_DECLARE(cortex_a9_gic, "arm,cortex-a9-gic", gic_of_init);
IRQCHIP_DECLARE(cortex_a7_gic, "arm,cortex-a7-gic", gic_of_init);
IRQCHIP_DECLARE(msm_8660_qgic, "qcom,msm-8660-qgic", gic_of_init);
IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init);
IRQCHIP_DECLARE(pl390, "arm,pl390", gic_of_init);
#endif
#ifdef CONFIG_ACPI
static phys_addr_t cpu_phy_base __initdata;
static int __init
gic_acpi_parse_madt_cpu(struct acpi_subtable_header *header,
const unsigned long end)
{
struct acpi_madt_generic_interrupt *processor;
phys_addr_t gic_cpu_base;
static int cpu_base_assigned;
processor = (struct acpi_madt_generic_interrupt *)header;
if (BAD_MADT_GICC_ENTRY(processor, end))
return -EINVAL;
/*
* There is no support for non-banked GICv1/2 register in ACPI spec.
* All CPU interface addresses have to be the same.
*/
gic_cpu_base = processor->base_address;
if (cpu_base_assigned && gic_cpu_base != cpu_phy_base)
return -EINVAL;
cpu_phy_base = gic_cpu_base;
cpu_base_assigned = 1;
return 0;
}
/* The things you have to do to just *count* something... */
static int __init acpi_dummy_func(struct acpi_subtable_header *header,
const unsigned long end)
{
return 0;
}
static bool __init acpi_gic_redist_is_present(void)
{
return acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
acpi_dummy_func, 0) > 0;
}
static bool __init gic_validate_dist(struct acpi_subtable_header *header,
struct acpi_probe_entry *ape)
{
struct acpi_madt_generic_distributor *dist;
dist = (struct acpi_madt_generic_distributor *)header;
return (dist->version == ape->driver_data &&
(dist->version != ACPI_MADT_GIC_VERSION_NONE ||
!acpi_gic_redist_is_present()));
}
#define ACPI_GICV2_DIST_MEM_SIZE (SZ_4K)
#define ACPI_GIC_CPU_IF_MEM_SIZE (SZ_8K)
static int __init gic_v2_acpi_init(struct acpi_subtable_header *header,
const unsigned long end)
{
struct acpi_madt_generic_distributor *dist;
void __iomem *cpu_base, *dist_base;
struct fwnode_handle *domain_handle;
int count;
/* Collect CPU base addresses */
count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
gic_acpi_parse_madt_cpu, 0);
if (count <= 0) {
pr_err("No valid GICC entries exist\n");
return -EINVAL;
}
cpu_base = ioremap(cpu_phy_base, ACPI_GIC_CPU_IF_MEM_SIZE);
if (!cpu_base) {
pr_err("Unable to map GICC registers\n");
return -ENOMEM;
}
dist = (struct acpi_madt_generic_distributor *)header;
dist_base = ioremap(dist->base_address, ACPI_GICV2_DIST_MEM_SIZE);
if (!dist_base) {
pr_err("Unable to map GICD registers\n");
iounmap(cpu_base);
return -ENOMEM;
}
/*
* Disable split EOI/Deactivate if HYP is not available. ACPI
* guarantees that we'll always have a GICv2, so the CPU
* interface will always be the right size.
*/
if (!is_hyp_mode_available())
static_key_slow_dec(&supports_deactivate);
/*
* Initialize GIC instance zero (no multi-GIC support).
*/
domain_handle = irq_domain_alloc_fwnode(dist_base);
if (!domain_handle) {
pr_err("Unable to allocate domain handle\n");
iounmap(cpu_base);
iounmap(dist_base);
return -ENOMEM;
}
__gic_init_bases(0, -1, dist_base, cpu_base, 0, domain_handle);
acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle);
return 0;
}
IRQCHIP_ACPI_DECLARE(gic_v2, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
gic_validate_dist, ACPI_MADT_GIC_VERSION_V2,
gic_v2_acpi_init);
IRQCHIP_ACPI_DECLARE(gic_v2_maybe, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
gic_validate_dist, ACPI_MADT_GIC_VERSION_NONE,
gic_v2_acpi_init);
#endif