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Diffstat (limited to '')
| -rw-r--r-- | drivers/irqchip/irq-gic.c | 1709 |
1 files changed, 1709 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c new file mode 100644 index 0000000000..412196a7da --- /dev/null +++ b/drivers/irqchip/irq-gic.c @@ -0,0 +1,1709 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2002 ARM Limited, All Rights Reserved. + * + * 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/kstrtox.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/seq_file.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(this_cpu_has_cap(ARM64_HAS_GIC_CPUIF_SYSREGS), + 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; + void __iomem *raw_dist_base; + void __iomem *raw_cpu_base; + u32 percpu_offset; +#if defined(CONFIG_CPU_PM) || defined(CONFIG_ARM_GIC_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_BL_SWITCHER + +static DEFINE_RAW_SPINLOCK(cpu_map_lock); + +#define gic_lock_irqsave(f) \ + raw_spin_lock_irqsave(&cpu_map_lock, (f)) +#define gic_unlock_irqrestore(f) \ + raw_spin_unlock_irqrestore(&cpu_map_lock, (f)) + +#define gic_lock() raw_spin_lock(&cpu_map_lock) +#define gic_unlock() raw_spin_unlock(&cpu_map_lock) + +#else + +#define gic_lock_irqsave(f) do { (void)(f); } while(0) +#define gic_unlock_irqrestore(f) do { (void)(f); } while(0) + +#define gic_lock() do { } while(0) +#define gic_unlock() do { } while(0) + +#endif + +static DEFINE_STATIC_KEY_FALSE(needs_rmw_access); + +/* + * 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 DEFINE_STATIC_KEY_TRUE(supports_deactivate_key); + +static struct gic_chip_data gic_data[CONFIG_ARM_GIC_MAX_NR] __read_mostly; + +static struct gic_kvm_info gic_v2_kvm_info __initdata; + +static DEFINE_PER_CPU(u32, sgi_intid); + +#ifdef CONFIG_GIC_NON_BANKED +static DEFINE_STATIC_KEY_FALSE(frankengic_key); + +static void enable_frankengic(void) +{ + static_branch_enable(&frankengic_key); +} + +static inline void __iomem *__get_base(union gic_base *base) +{ + if (static_branch_unlikely(&frankengic_key)) + return raw_cpu_read(*base->percpu_base); + + return base->common_base; +} + +#define gic_data_dist_base(d) __get_base(&(d)->dist_base) +#define gic_data_cpu_base(d) __get_base(&(d)->cpu_base) +#else +#define gic_data_dist_base(d) ((d)->dist_base.common_base) +#define gic_data_cpu_base(d) ((d)->cpu_base.common_base) +#define enable_frankengic() do { } while(0) +#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) +{ + u32 hwirq = gic_irq(d); + + if (hwirq < 16) + hwirq = this_cpu_read(sgi_intid); + + writel_relaxed(hwirq, gic_cpu_base(d) + GIC_CPU_EOI); +} + +static void gic_eoimode1_eoi_irq(struct irq_data *d) +{ + u32 hwirq = gic_irq(d); + + /* Do not deactivate an IRQ forwarded to a vcpu. */ + if (irqd_is_forwarded_to_vcpu(d)) + return; + + if (hwirq < 16) + hwirq = this_cpu_read(sgi_intid); + + writel_relaxed(hwirq, 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); + int ret; + + /* Interrupt configuration for SGIs can't be changed */ + if (gicirq < 16) + return type != IRQ_TYPE_EDGE_RISING ? -EINVAL : 0; + + /* SPIs have restrictions on the supported types */ + if (gicirq >= 32 && type != IRQ_TYPE_LEVEL_HIGH && + type != IRQ_TYPE_EDGE_RISING) + return -EINVAL; + + ret = gic_configure_irq(gicirq, type, base + GIC_DIST_CONFIG, NULL); + if (ret && gicirq < 32) { + /* Misconfigured PPIs are usually not fatal */ + pr_warn("GIC: PPI%d is secure or misconfigured\n", gicirq - 16); + ret = 0; + } + + return ret; +} + +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) || gic_irq(d) < 16) + return -EINVAL; + + if (vcpu) + irqd_set_forwarded_to_vcpu(d); + else + irqd_clr_forwarded_to_vcpu(d); + return 0; +} + +static int gic_retrigger(struct irq_data *data) +{ + return !gic_irq_set_irqchip_state(data, IRQCHIP_STATE_PENDING, true); +} + +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 (unlikely(irqnr >= 1020)) + break; + + if (static_branch_likely(&supports_deactivate_key)) + writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI); + isb(); + + /* + * Ensure any shared data written by the CPU sending the IPI + * is read after we've read the ACK register on the GIC. + * + * Pairs with the write barrier in gic_ipi_send_mask + */ + if (irqnr <= 15) { + smp_rmb(); + + /* + * The GIC encodes the source CPU in GICC_IAR, + * leading to the deactivation to fail if not + * written back as is to GICC_EOI. Stash the INTID + * away for gic_eoi_irq() to write back. This only + * works because we don't nest SGIs... + */ + this_cpu_write(sgi_intid, irqstat); + } + + generic_handle_domain_irq(gic->domain, irqnr); + } 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 gic_irq; + unsigned long status; + int ret; + + chained_irq_enter(chip, desc); + + status = readl_relaxed(gic_data_cpu_base(chip_data) + GIC_CPU_INTACK); + + gic_irq = (status & GICC_IAR_INT_ID_MASK); + if (gic_irq == GICC_INT_SPURIOUS) + goto out; + + isb(); + ret = generic_handle_domain_irq(chip_data->domain, gic_irq); + if (unlikely(ret)) + handle_bad_irq(desc); + out: + chained_irq_exit(chip, desc); +} + +static void gic_irq_print_chip(struct irq_data *d, struct seq_file *p) +{ + struct gic_chip_data *gic = irq_data_get_irq_chip_data(d); + + if (gic->domain->pm_dev) + seq_printf(p, gic->domain->pm_dev->of_node->name); + else + seq_printf(p, "GIC-%d", (int)(gic - &gic_data[0])); +} + +void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq) +{ + BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR); + 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 bool gic_check_gicv2(void __iomem *base) +{ + u32 val = readl_relaxed(base + GIC_CPU_IDENT); + return (val & 0xff0fff) == 0x02043B; +} + +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; + int i; + + if (gic == &gic_data[0] && static_branch_likely(&supports_deactivate_key)) + mode = GIC_CPU_CTRL_EOImodeNS; + + if (gic_check_gicv2(cpu_base)) + for (i = 0; i < 4; i++) + writel_relaxed(0, cpu_base + GIC_CPU_ACTIVEPRIO + i * 4); + + /* + * 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 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 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); + 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. + */ + if (WARN_ON(cpu >= NR_GIC_CPU_IF)) + return -EINVAL; + + gic_check_cpu_features(); + 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, 32, NULL); + + 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) +{ + void __iomem *cpu_base; + u32 val = 0; + + if (gic_nr >= CONFIG_ARM_GIC_MAX_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; +} + +#if defined(CONFIG_CPU_PM) || defined(CONFIG_ARM_GIC_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. + */ +void gic_dist_save(struct gic_chip_data *gic) +{ + unsigned int gic_irqs; + void __iomem *dist_base; + int i; + + if (WARN_ON(!gic)) + return; + + gic_irqs = gic->gic_irqs; + dist_base = gic_data_dist_base(gic); + + if (!dist_base) + return; + + for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++) + gic->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->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->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->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 occurred while the GIC was suspended is still present, it will be + * handled normally, but any edge interrupts that occurred will not be seen by + * the GIC and need to be handled by the platform-specific wakeup source. + */ +void gic_dist_restore(struct gic_chip_data *gic) +{ + unsigned int gic_irqs; + unsigned int i; + void __iomem *dist_base; + + if (WARN_ON(!gic)) + return; + + gic_irqs = gic->gic_irqs; + dist_base = gic_data_dist_base(gic); + + 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->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->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->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->saved_spi_active[i], + dist_base + GIC_DIST_ACTIVE_SET + i * 4); + } + + writel_relaxed(GICD_ENABLE, dist_base + GIC_DIST_CTRL); +} + +void gic_cpu_save(struct gic_chip_data *gic) +{ + int i; + u32 *ptr; + void __iomem *dist_base; + void __iomem *cpu_base; + + if (WARN_ON(!gic)) + return; + + dist_base = gic_data_dist_base(gic); + cpu_base = gic_data_cpu_base(gic); + + if (!dist_base || !cpu_base) + return; + + ptr = raw_cpu_ptr(gic->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->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->saved_ppi_conf); + for (i = 0; i < DIV_ROUND_UP(32, 16); i++) + ptr[i] = readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4); + +} + +void gic_cpu_restore(struct gic_chip_data *gic) +{ + int i; + u32 *ptr; + void __iomem *dist_base; + void __iomem *cpu_base; + + if (WARN_ON(!gic)) + return; + + dist_base = gic_data_dist_base(gic); + cpu_base = gic_data_cpu_base(gic); + + if (!dist_base || !cpu_base) + return; + + ptr = raw_cpu_ptr(gic->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->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->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); +} + +static int gic_notifier(struct notifier_block *self, unsigned long cmd, void *v) +{ + int i; + + for (i = 0; i < CONFIG_ARM_GIC_MAX_NR; i++) { + switch (cmd) { + case CPU_PM_ENTER: + gic_cpu_save(&gic_data[i]); + break; + case CPU_PM_ENTER_FAILED: + case CPU_PM_EXIT: + gic_cpu_restore(&gic_data[i]); + break; + case CPU_CLUSTER_PM_ENTER: + gic_dist_save(&gic_data[i]); + break; + case CPU_CLUSTER_PM_ENTER_FAILED: + case CPU_CLUSTER_PM_EXIT: + gic_dist_restore(&gic_data[i]); + break; + } + } + + return NOTIFY_OK; +} + +static struct notifier_block gic_notifier_block = { + .notifier_call = gic_notifier, +}; + +static int gic_pm_init(struct gic_chip_data *gic) +{ + gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4, + sizeof(u32)); + if (WARN_ON(!gic->saved_ppi_enable)) + return -ENOMEM; + + gic->saved_ppi_active = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4, + sizeof(u32)); + 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)); + 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 int gic_pm_init(struct gic_chip_data *gic) +{ + return 0; +} +#endif + +#ifdef CONFIG_SMP +static void rmw_writeb(u8 bval, void __iomem *addr) +{ + static DEFINE_RAW_SPINLOCK(rmw_lock); + unsigned long offset = (unsigned long)addr & 3UL; + unsigned long shift = offset * 8; + unsigned long flags; + u32 val; + + raw_spin_lock_irqsave(&rmw_lock, flags); + + addr -= offset; + val = readl_relaxed(addr); + val &= ~GENMASK(shift + 7, shift); + val |= bval << shift; + writel_relaxed(val, addr); + + raw_spin_unlock_irqrestore(&rmw_lock, flags); +} + +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); + struct gic_chip_data *gic = irq_data_get_irq_chip_data(d); + unsigned int cpu; + + if (unlikely(gic != &gic_data[0])) + return -EINVAL; + + 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; + + if (static_branch_unlikely(&needs_rmw_access)) + rmw_writeb(gic_cpu_map[cpu], reg); + else + writeb_relaxed(gic_cpu_map[cpu], reg); + irq_data_update_effective_affinity(d, cpumask_of(cpu)); + + return IRQ_SET_MASK_OK_DONE; +} + +static void gic_ipi_send_mask(struct irq_data *d, const struct cpumask *mask) +{ + int cpu; + unsigned long flags, map = 0; + + if (unlikely(nr_cpu_ids == 1)) { + /* Only one CPU? let's do a self-IPI... */ + writel_relaxed(2 << 24 | d->hwirq, + gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT); + return; + } + + gic_lock_irqsave(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 | d->hwirq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT); + + gic_unlock_irqrestore(flags); +} + +static int gic_starting_cpu(unsigned int cpu) +{ + gic_cpu_init(&gic_data[0]); + return 0; +} + +static __init void gic_smp_init(void) +{ + struct irq_fwspec sgi_fwspec = { + .fwnode = gic_data[0].domain->fwnode, + .param_count = 1, + }; + int base_sgi; + + cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_GIC_STARTING, + "irqchip/arm/gic:starting", + gic_starting_cpu, NULL); + + base_sgi = irq_domain_alloc_irqs(gic_data[0].domain, 8, NUMA_NO_NODE, &sgi_fwspec); + if (WARN_ON(base_sgi <= 0)) + return; + + set_smp_ipi_range(base_sgi, 8); +} +#else +#define gic_smp_init() do { } while(0) +#define gic_set_affinity NULL +#define gic_ipi_send_mask NULL +#endif + +static const struct irq_chip gic_chip = { + .irq_mask = gic_mask_irq, + .irq_unmask = gic_unmask_irq, + .irq_eoi = gic_eoi_irq, + .irq_set_type = gic_set_type, + .irq_retrigger = gic_retrigger, + .irq_set_affinity = gic_set_affinity, + .ipi_send_mask = gic_ipi_send_mask, + .irq_get_irqchip_state = gic_irq_get_irqchip_state, + .irq_set_irqchip_state = gic_irq_set_irqchip_state, + .irq_print_chip = gic_irq_print_chip, + .flags = IRQCHIP_SET_TYPE_MASKED | + IRQCHIP_SKIP_SET_WAKE | + IRQCHIP_MASK_ON_SUSPEND, +}; + +static const struct irq_chip gic_chip_mode1 = { + .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, + .irq_retrigger = gic_retrigger, + .irq_set_affinity = gic_set_affinity, + .ipi_send_mask = gic_ipi_send_mask, + .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, +}; + +#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; + + BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR); + + 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; + + gic_lock(); + + /* Update the target interface for this logical CPU */ + gic_cpu_map[cpu] = 1 << new_cpu_id; + + /* + * Find all the peripheral interrupts targeting 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); + } + } + + gic_unlock(); + + /* + * 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; +} + +static 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 gic_chip_data *gic = d->host_data; + struct irq_data *irqd = irq_desc_get_irq_data(irq_to_desc(irq)); + const struct irq_chip *chip; + + chip = (static_branch_likely(&supports_deactivate_key) && + gic == &gic_data[0]) ? &gic_chip_mode1 : &gic_chip; + + switch (hw) { + case 0 ... 31: + irq_set_percpu_devid(irq); + irq_domain_set_info(d, irq, hw, chip, d->host_data, + handle_percpu_devid_irq, NULL, NULL); + break; + default: + irq_domain_set_info(d, irq, hw, chip, d->host_data, + handle_fasteoi_irq, NULL, NULL); + irq_set_probe(irq); + irqd_set_single_target(irqd); + break; + } + + /* Prevents SW retriggers which mess up the ACK/EOI ordering */ + irqd_set_handle_enforce_irqctx(irqd); + return 0; +} + +static int gic_irq_domain_translate(struct irq_domain *d, + struct irq_fwspec *fwspec, + unsigned long *hwirq, + unsigned int *type) +{ + if (fwspec->param_count == 1 && fwspec->param[0] < 16) { + *hwirq = fwspec->param[0]; + *type = IRQ_TYPE_EDGE_RISING; + return 0; + } + + if (is_of_node(fwspec->fwnode)) { + if (fwspec->param_count < 3) + return -EINVAL; + + switch (fwspec->param[0]) { + case 0: /* SPI */ + *hwirq = fwspec->param[1] + 32; + break; + case 1: /* PPI */ + *hwirq = fwspec->param[1] + 16; + break; + default: + return -EINVAL; + } + + *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK; + + /* Make it clear that broken DTs are... broken */ + WARN(*type == IRQ_TYPE_NONE, + "HW irq %ld has invalid type\n", *hwirq); + return 0; + } + + if (is_fwnode_irqchip(fwspec->fwnode)) { + if(fwspec->param_count != 2) + return -EINVAL; + + if (fwspec->param[0] < 16) { + pr_err(FW_BUG "Illegal GSI%d translation request\n", + fwspec->param[0]); + return -EINVAL; + } + + *hwirq = fwspec->param[0]; + *type = fwspec->param[1]; + + WARN(*type == IRQ_TYPE_NONE, + "HW irq %ld has invalid type\n", *hwirq); + return 0; + } + + return -EINVAL; +} + +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++) { + ret = gic_irq_domain_map(domain, virq + i, hwirq + i); + if (ret) + return ret; + } + + 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 int gic_init_bases(struct gic_chip_data *gic, + struct fwnode_handle *handle) +{ + int gic_irqs, ret; + + if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && gic->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)) { + ret = -ENOMEM; + goto error; + } + + for_each_possible_cpu(cpu) { + u32 mpidr = cpu_logical_map(cpu); + u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0); + unsigned long offset = gic->percpu_offset * core_id; + *per_cpu_ptr(gic->dist_base.percpu_base, cpu) = + gic->raw_dist_base + offset; + *per_cpu_ptr(gic->cpu_base.percpu_base, cpu) = + gic->raw_cpu_base + offset; + } + + enable_frankengic(); + } else { + /* Normal, sane GIC... */ + WARN(gic->percpu_offset, + "GIC_NON_BANKED not enabled, ignoring %08x offset!", + gic->percpu_offset); + gic->dist_base.common_base = gic->raw_dist_base; + gic->cpu_base.common_base = gic->raw_cpu_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; + + gic->domain = irq_domain_create_linear(handle, gic_irqs, + &gic_irq_domain_hierarchy_ops, + gic); + if (WARN_ON(!gic->domain)) { + ret = -ENODEV; + goto error; + } + + gic_dist_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) && gic->percpu_offset) { + free_percpu(gic->dist_base.percpu_base); + free_percpu(gic->cpu_base.percpu_base); + } + + return ret; +} + +static int __init __gic_init_bases(struct gic_chip_data *gic, + struct fwnode_handle *handle) +{ + int i, ret; + + if (WARN_ON(!gic || gic->domain)) + return -EINVAL; + + if (gic == &gic_data[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; + + set_handle_irq(gic_handle_irq); + if (static_branch_likely(&supports_deactivate_key)) + pr_info("GIC: Using split EOI/Deactivate mode\n"); + } + + ret = gic_init_bases(gic, handle); + if (gic == &gic_data[0]) + gic_smp_init(); + + return ret; +} + +static void gic_teardown(struct gic_chip_data *gic) +{ + if (WARN_ON(!gic)) + return; + + if (gic->raw_dist_base) + iounmap(gic->raw_dist_base); + if (gic->raw_cpu_base) + iounmap(gic->raw_cpu_base); +} + +static int gic_cnt __initdata; +static bool gicv2_force_probe; + +static int __init gicv2_force_probe_cfg(char *buf) +{ + return kstrtobool(buf, &gicv2_force_probe); +} +early_param("irqchip.gicv2_force_probe", gicv2_force_probe_cfg); + +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) { + void __iomem *alt; + /* + * Check for a stupid firmware that only exposes the + * first page of a GICv2. + */ + if (!gic_check_gicv2(*base)) + return false; + + if (!gicv2_force_probe) { + pr_warn("GIC: GICv2 detected, but range too small and irqchip.gicv2_force_probe not set\n"); + return false; + } + + alt = ioremap(cpuif_res.start, SZ_8K); + if (!alt) + return false; + if (!gic_check_gicv2(alt + SZ_4K)) { + /* + * The first page was that of a GICv2, and + * the second was *something*. Let's trust it + * to be a GICv2, and update the mapping. + */ + pr_warn("GIC: GICv2 at %pa, but range is too small (broken DT?), assuming 8kB\n", + &cpuif_res.start); + iounmap(*base); + *base = alt; + return true; + } + + /* + * We detected *two* initial GICv2 pages in a + * row. Could be a GICv2 aliased over two 64kB + * pages. Update the resource, map the iospace, and + * pray. + */ + iounmap(alt); + alt = ioremap(cpuif_res.start, SZ_128K); + if (!alt) + return false; + pr_warn("GIC: Aliased GICv2 at %pa, trying to find the canonical range over 128kB\n", + &cpuif_res.start); + cpuif_res.end = cpuif_res.start + SZ_128K -1; + iounmap(*base); + *base = alt; + } + if (resource_size(&cpuif_res) == SZ_128K) { + /* + * Verify that we have the first 4kB of a GICv2 + * aliased over the first 64kB by checking the + * GICC_IIDR register on both ends. + */ + if (!gic_check_gicv2(*base) || + !gic_check_gicv2(*base + 0xf000)) + 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\n", + &cpuif_res.start); + } + + return true; +} + +static bool gic_enable_rmw_access(void *data) +{ + /* + * The EMEV2 class of machines has a broken interconnect, and + * locks up on accesses that are less than 32bit. So far, only + * the affinity setting requires it. + */ + if (of_machine_is_compatible("renesas,emev2")) { + static_branch_enable(&needs_rmw_access); + return true; + } + + return false; +} + +static const struct gic_quirk gic_quirks[] = { + { + .desc = "broken byte access", + .compatible = "arm,pl390", + .init = gic_enable_rmw_access, + }, + { }, +}; + +static int gic_of_setup(struct gic_chip_data *gic, struct device_node *node) +{ + if (!gic || !node) + return -EINVAL; + + gic->raw_dist_base = of_iomap(node, 0); + if (WARN(!gic->raw_dist_base, "unable to map gic dist registers\n")) + goto error; + + gic->raw_cpu_base = of_iomap(node, 1); + if (WARN(!gic->raw_cpu_base, "unable to map gic cpu registers\n")) + goto error; + + if (of_property_read_u32(node, "cpu-offset", &gic->percpu_offset)) + gic->percpu_offset = 0; + + gic_enable_of_quirks(node, gic_quirks, gic); + + return 0; + +error: + gic_teardown(gic); + + return -ENOMEM; +} + +int gic_of_init_child(struct device *dev, struct gic_chip_data **gic, int irq) +{ + int ret; + + if (!dev || !dev->of_node || !gic || !irq) + return -EINVAL; + + *gic = devm_kzalloc(dev, sizeof(**gic), GFP_KERNEL); + if (!*gic) + return -ENOMEM; + + ret = gic_of_setup(*gic, dev->of_node); + if (ret) + return ret; + + ret = gic_init_bases(*gic, &dev->of_node->fwnode); + if (ret) { + gic_teardown(*gic); + return ret; + } + + irq_domain_set_pm_device((*gic)->domain, dev); + irq_set_chained_handler_and_data(irq, gic_handle_cascade_irq, *gic); + + return 0; +} + +static void __init gic_of_setup_kvm_info(struct device_node *node) +{ + int ret; + struct resource *vctrl_res = &gic_v2_kvm_info.vctrl; + struct resource *vcpu_res = &gic_v2_kvm_info.vcpu; + + gic_v2_kvm_info.type = GIC_V2; + + gic_v2_kvm_info.maint_irq = irq_of_parse_and_map(node, 0); + if (!gic_v2_kvm_info.maint_irq) + return; + + ret = of_address_to_resource(node, 2, vctrl_res); + if (ret) + return; + + ret = of_address_to_resource(node, 3, vcpu_res); + if (ret) + return; + + if (static_branch_likely(&supports_deactivate_key)) + vgic_set_kvm_info(&gic_v2_kvm_info); +} + +int __init +gic_of_init(struct device_node *node, struct device_node *parent) +{ + struct gic_chip_data *gic; + int irq, ret; + + if (WARN_ON(!node)) + return -ENODEV; + + if (WARN_ON(gic_cnt >= CONFIG_ARM_GIC_MAX_NR)) + return -EINVAL; + + gic = &gic_data[gic_cnt]; + + ret = gic_of_setup(gic, node); + if (ret) + return ret; + + /* + * 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, &gic->raw_cpu_base)) + static_branch_disable(&supports_deactivate_key); + + ret = __gic_init_bases(gic, &node->fwnode); + if (ret) { + gic_teardown(gic); + return ret; + } + + if (!gic_cnt) { + gic_init_physaddr(node); + gic_of_setup_kvm_info(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_init(&node->fwnode, 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); + +#ifdef CONFIG_ACPI +static struct +{ + phys_addr_t cpu_phys_base; + u32 maint_irq; + int maint_irq_mode; + phys_addr_t vctrl_base; + phys_addr_t vcpu_base; +} acpi_data __initdata; + +static int __init +gic_acpi_parse_madt_cpu(union acpi_subtable_headers *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 != acpi_data.cpu_phys_base) + return -EINVAL; + + acpi_data.cpu_phys_base = gic_cpu_base; + acpi_data.maint_irq = processor->vgic_interrupt; + acpi_data.maint_irq_mode = (processor->flags & ACPI_MADT_VGIC_IRQ_MODE) ? + ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE; + acpi_data.vctrl_base = processor->gich_base_address; + acpi_data.vcpu_base = processor->gicv_base_address; + + cpu_base_assigned = 1; + return 0; +} + +/* The things you have to do to just *count* something... */ +static int __init acpi_dummy_func(union acpi_subtable_headers *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) +#define ACPI_GICV2_VCTRL_MEM_SIZE (SZ_4K) +#define ACPI_GICV2_VCPU_MEM_SIZE (SZ_8K) + +static void __init gic_acpi_setup_kvm_info(void) +{ + int irq; + struct resource *vctrl_res = &gic_v2_kvm_info.vctrl; + struct resource *vcpu_res = &gic_v2_kvm_info.vcpu; + + gic_v2_kvm_info.type = GIC_V2; + + if (!acpi_data.vctrl_base) + return; + + vctrl_res->flags = IORESOURCE_MEM; + vctrl_res->start = acpi_data.vctrl_base; + vctrl_res->end = vctrl_res->start + ACPI_GICV2_VCTRL_MEM_SIZE - 1; + + if (!acpi_data.vcpu_base) + return; + + vcpu_res->flags = IORESOURCE_MEM; + vcpu_res->start = acpi_data.vcpu_base; + vcpu_res->end = vcpu_res->start + ACPI_GICV2_VCPU_MEM_SIZE - 1; + + irq = acpi_register_gsi(NULL, acpi_data.maint_irq, + acpi_data.maint_irq_mode, + ACPI_ACTIVE_HIGH); + if (irq <= 0) + return; + + gic_v2_kvm_info.maint_irq = irq; + + vgic_set_kvm_info(&gic_v2_kvm_info); +} + +static struct fwnode_handle *gsi_domain_handle; + +static struct fwnode_handle *gic_v2_get_gsi_domain_id(u32 gsi) +{ + return gsi_domain_handle; +} + +static int __init gic_v2_acpi_init(union acpi_subtable_headers *header, + const unsigned long end) +{ + struct acpi_madt_generic_distributor *dist; + struct gic_chip_data *gic = &gic_data[0]; + int count, ret; + + /* 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; + } + + gic->raw_cpu_base = ioremap(acpi_data.cpu_phys_base, ACPI_GIC_CPU_IF_MEM_SIZE); + if (!gic->raw_cpu_base) { + pr_err("Unable to map GICC registers\n"); + return -ENOMEM; + } + + dist = (struct acpi_madt_generic_distributor *)header; + gic->raw_dist_base = ioremap(dist->base_address, + ACPI_GICV2_DIST_MEM_SIZE); + if (!gic->raw_dist_base) { + pr_err("Unable to map GICD registers\n"); + gic_teardown(gic); + 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_branch_disable(&supports_deactivate_key); + + /* + * Initialize GIC instance zero (no multi-GIC support). + */ + gsi_domain_handle = irq_domain_alloc_fwnode(&dist->base_address); + if (!gsi_domain_handle) { + pr_err("Unable to allocate domain handle\n"); + gic_teardown(gic); + return -ENOMEM; + } + + ret = __gic_init_bases(gic, gsi_domain_handle); + if (ret) { + pr_err("Failed to initialise GIC\n"); + irq_domain_free_fwnode(gsi_domain_handle); + gic_teardown(gic); + return ret; + } + + acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, gic_v2_get_gsi_domain_id); + + if (IS_ENABLED(CONFIG_ARM_GIC_V2M)) + gicv2m_init(NULL, gic_data[0].domain); + + if (static_branch_likely(&supports_deactivate_key)) + gic_acpi_setup_kvm_info(); + + 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 |