| /* |
| * Copyright (C) 2013, 2014 ARM Limited, All Rights Reserved. |
| * Author: Marc Zyngier <marc.zyngier@arm.com> |
| * |
| * 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. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <linux/acpi.h> |
| #include <linux/cpu.h> |
| #include <linux/cpu_pm.h> |
| #include <linux/delay.h> |
| #include <linux/interrupt.h> |
| #include <linux/irqdomain.h> |
| #include <linux/of.h> |
| #include <linux/of_address.h> |
| #include <linux/of_irq.h> |
| #include <linux/percpu.h> |
| #include <linux/slab.h> |
| |
| #include <linux/irqchip.h> |
| #include <linux/irqchip/arm-gic-v3.h> |
| #include <linux/irqchip/irq-partition-percpu.h> |
| |
| #include <asm/cputype.h> |
| #include <asm/exception.h> |
| #include <asm/smp_plat.h> |
| #include <asm/virt.h> |
| |
| #include "irq-gic-common.h" |
| |
| struct redist_region { |
| void __iomem *redist_base; |
| phys_addr_t phys_base; |
| bool single_redist; |
| }; |
| |
| struct gic_chip_data { |
| struct fwnode_handle *fwnode; |
| void __iomem *dist_base; |
| struct redist_region *redist_regions; |
| struct rdists rdists; |
| struct irq_domain *domain; |
| u64 redist_stride; |
| u32 nr_redist_regions; |
| unsigned int irq_nr; |
| struct partition_desc *ppi_descs[16]; |
| }; |
| |
| static struct gic_chip_data gic_data __read_mostly; |
| static struct static_key supports_deactivate = STATIC_KEY_INIT_TRUE; |
| |
| #define gic_data_rdist() (this_cpu_ptr(gic_data.rdists.rdist)) |
| #define gic_data_rdist_rd_base() (gic_data_rdist()->rd_base) |
| #define gic_data_rdist_sgi_base() (gic_data_rdist_rd_base() + SZ_64K) |
| |
| /* Our default, arbitrary priority value. Linux only uses one anyway. */ |
| #define DEFAULT_PMR_VALUE 0xf0 |
| |
| static inline unsigned int gic_irq(struct irq_data *d) |
| { |
| return d->hwirq; |
| } |
| |
| static inline int gic_irq_in_rdist(struct irq_data *d) |
| { |
| return gic_irq(d) < 32; |
| } |
| |
| static inline void __iomem *gic_dist_base(struct irq_data *d) |
| { |
| if (gic_irq_in_rdist(d)) /* SGI+PPI -> SGI_base for this CPU */ |
| return gic_data_rdist_sgi_base(); |
| |
| if (d->hwirq <= 1023) /* SPI -> dist_base */ |
| return gic_data.dist_base; |
| |
| return NULL; |
| } |
| |
| static void gic_do_wait_for_rwp(void __iomem *base) |
| { |
| u32 count = 1000000; /* 1s! */ |
| |
| while (readl_relaxed(base + GICD_CTLR) & GICD_CTLR_RWP) { |
| count--; |
| if (!count) { |
| pr_err_ratelimited("RWP timeout, gone fishing\n"); |
| return; |
| } |
| cpu_relax(); |
| udelay(1); |
| }; |
| } |
| |
| /* Wait for completion of a distributor change */ |
| static void gic_dist_wait_for_rwp(void) |
| { |
| gic_do_wait_for_rwp(gic_data.dist_base); |
| } |
| |
| /* Wait for completion of a redistributor change */ |
| static void gic_redist_wait_for_rwp(void) |
| { |
| gic_do_wait_for_rwp(gic_data_rdist_rd_base()); |
| } |
| |
| #ifdef CONFIG_ARM64 |
| static DEFINE_STATIC_KEY_FALSE(is_cavium_thunderx); |
| |
| static u64 __maybe_unused gic_read_iar(void) |
| { |
| if (static_branch_unlikely(&is_cavium_thunderx)) |
| return gic_read_iar_cavium_thunderx(); |
| else |
| return gic_read_iar_common(); |
| } |
| #endif |
| |
| static void gic_enable_redist(bool enable) |
| { |
| void __iomem *rbase; |
| u32 count = 1000000; /* 1s! */ |
| u32 val; |
| |
| rbase = gic_data_rdist_rd_base(); |
| |
| val = readl_relaxed(rbase + GICR_WAKER); |
| if (enable) |
| /* Wake up this CPU redistributor */ |
| val &= ~GICR_WAKER_ProcessorSleep; |
| else |
| val |= GICR_WAKER_ProcessorSleep; |
| writel_relaxed(val, rbase + GICR_WAKER); |
| |
| if (!enable) { /* Check that GICR_WAKER is writeable */ |
| val = readl_relaxed(rbase + GICR_WAKER); |
| if (!(val & GICR_WAKER_ProcessorSleep)) |
| return; /* No PM support in this redistributor */ |
| } |
| |
| while (count--) { |
| val = readl_relaxed(rbase + GICR_WAKER); |
| if (enable ^ (val & GICR_WAKER_ChildrenAsleep)) |
| break; |
| cpu_relax(); |
| udelay(1); |
| }; |
| if (!count) |
| pr_err_ratelimited("redistributor failed to %s...\n", |
| enable ? "wakeup" : "sleep"); |
| } |
| |
| /* |
| * Routines to disable, enable, EOI and route interrupts |
| */ |
| static int gic_peek_irq(struct irq_data *d, u32 offset) |
| { |
| u32 mask = 1 << (gic_irq(d) % 32); |
| void __iomem *base; |
| |
| if (gic_irq_in_rdist(d)) |
| base = gic_data_rdist_sgi_base(); |
| else |
| base = gic_data.dist_base; |
| |
| return !!(readl_relaxed(base + offset + (gic_irq(d) / 32) * 4) & mask); |
| } |
| |
| static void gic_poke_irq(struct irq_data *d, u32 offset) |
| { |
| u32 mask = 1 << (gic_irq(d) % 32); |
| void (*rwp_wait)(void); |
| void __iomem *base; |
| |
| if (gic_irq_in_rdist(d)) { |
| base = gic_data_rdist_sgi_base(); |
| rwp_wait = gic_redist_wait_for_rwp; |
| } else { |
| base = gic_data.dist_base; |
| rwp_wait = gic_dist_wait_for_rwp; |
| } |
| |
| writel_relaxed(mask, base + offset + (gic_irq(d) / 32) * 4); |
| rwp_wait(); |
| } |
| |
| static void gic_mask_irq(struct irq_data *d) |
| { |
| gic_poke_irq(d, GICD_ICENABLER); |
| } |
| |
| 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, GICD_ICACTIVER); |
| } |
| |
| static void gic_unmask_irq(struct irq_data *d) |
| { |
| gic_poke_irq(d, GICD_ISENABLER); |
| } |
| |
| static int gic_irq_set_irqchip_state(struct irq_data *d, |
| enum irqchip_irq_state which, bool val) |
| { |
| u32 reg; |
| |
| if (d->hwirq >= gic_data.irq_nr) /* PPI/SPI only */ |
| return -EINVAL; |
| |
| switch (which) { |
| case IRQCHIP_STATE_PENDING: |
| reg = val ? GICD_ISPENDR : GICD_ICPENDR; |
| break; |
| |
| case IRQCHIP_STATE_ACTIVE: |
| reg = val ? GICD_ISACTIVER : GICD_ICACTIVER; |
| break; |
| |
| case IRQCHIP_STATE_MASKED: |
| reg = val ? GICD_ICENABLER : GICD_ISENABLER; |
| 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) |
| { |
| if (d->hwirq >= gic_data.irq_nr) /* PPI/SPI only */ |
| return -EINVAL; |
| |
| switch (which) { |
| case IRQCHIP_STATE_PENDING: |
| *val = gic_peek_irq(d, GICD_ISPENDR); |
| break; |
| |
| case IRQCHIP_STATE_ACTIVE: |
| *val = gic_peek_irq(d, GICD_ISACTIVER); |
| break; |
| |
| case IRQCHIP_STATE_MASKED: |
| *val = !gic_peek_irq(d, GICD_ISENABLER); |
| break; |
| |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static void gic_eoi_irq(struct irq_data *d) |
| { |
| gic_write_eoir(gic_irq(d)); |
| } |
| |
| static void gic_eoimode1_eoi_irq(struct irq_data *d) |
| { |
| /* |
| * No need to deactivate an LPI, or an interrupt that |
| * is is getting forwarded to a vcpu. |
| */ |
| if (gic_irq(d) >= 8192 || irqd_is_forwarded_to_vcpu(d)) |
| return; |
| gic_write_dir(gic_irq(d)); |
| } |
| |
| static int gic_set_type(struct irq_data *d, unsigned int type) |
| { |
| unsigned int irq = gic_irq(d); |
| void (*rwp_wait)(void); |
| void __iomem *base; |
| |
| /* Interrupt configuration for SGIs can't be changed */ |
| if (irq < 16) |
| return -EINVAL; |
| |
| /* SPIs have restrictions on the supported types */ |
| if (irq >= 32 && type != IRQ_TYPE_LEVEL_HIGH && |
| type != IRQ_TYPE_EDGE_RISING) |
| return -EINVAL; |
| |
| if (gic_irq_in_rdist(d)) { |
| base = gic_data_rdist_sgi_base(); |
| rwp_wait = gic_redist_wait_for_rwp; |
| } else { |
| base = gic_data.dist_base; |
| rwp_wait = gic_dist_wait_for_rwp; |
| } |
| |
| return gic_configure_irq(irq, type, base, rwp_wait); |
| } |
| |
| static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu) |
| { |
| if (vcpu) |
| irqd_set_forwarded_to_vcpu(d); |
| else |
| irqd_clr_forwarded_to_vcpu(d); |
| return 0; |
| } |
| |
| static u64 gic_mpidr_to_affinity(unsigned long mpidr) |
| { |
| u64 aff; |
| |
| aff = ((u64)MPIDR_AFFINITY_LEVEL(mpidr, 3) << 32 | |
| MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 | |
| MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 | |
| MPIDR_AFFINITY_LEVEL(mpidr, 0)); |
| |
| return aff; |
| } |
| |
| static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs) |
| { |
| u32 irqnr; |
| |
| do { |
| irqnr = gic_read_iar(); |
| |
| if (likely(irqnr > 15 && irqnr < 1020) || irqnr >= 8192) { |
| int err; |
| |
| if (static_key_true(&supports_deactivate)) |
| gic_write_eoir(irqnr); |
| |
| err = handle_domain_irq(gic_data.domain, irqnr, regs); |
| if (err) { |
| WARN_ONCE(true, "Unexpected interrupt received!\n"); |
| if (static_key_true(&supports_deactivate)) { |
| if (irqnr < 8192) |
| gic_write_dir(irqnr); |
| } else { |
| gic_write_eoir(irqnr); |
| } |
| } |
| continue; |
| } |
| if (irqnr < 16) { |
| gic_write_eoir(irqnr); |
| if (static_key_true(&supports_deactivate)) |
| gic_write_dir(irqnr); |
| #ifdef CONFIG_SMP |
| handle_IPI(irqnr, regs); |
| #else |
| WARN_ONCE(true, "Unexpected SGI received!\n"); |
| #endif |
| continue; |
| } |
| } while (irqnr != ICC_IAR1_EL1_SPURIOUS); |
| } |
| |
| static void __init gic_dist_init(void) |
| { |
| unsigned int i; |
| u64 affinity; |
| void __iomem *base = gic_data.dist_base; |
| |
| /* Disable the distributor */ |
| writel_relaxed(0, base + GICD_CTLR); |
| gic_dist_wait_for_rwp(); |
| |
| gic_dist_config(base, gic_data.irq_nr, gic_dist_wait_for_rwp); |
| |
| /* Enable distributor with ARE, Group1 */ |
| writel_relaxed(GICD_CTLR_ARE_NS | GICD_CTLR_ENABLE_G1A | GICD_CTLR_ENABLE_G1, |
| base + GICD_CTLR); |
| |
| /* |
| * Set all global interrupts to the boot CPU only. ARE must be |
| * enabled. |
| */ |
| affinity = gic_mpidr_to_affinity(cpu_logical_map(smp_processor_id())); |
| for (i = 32; i < gic_data.irq_nr; i++) |
| gic_write_irouter(affinity, base + GICD_IROUTER + i * 8); |
| } |
| |
| static int gic_populate_rdist(void) |
| { |
| unsigned long mpidr = cpu_logical_map(smp_processor_id()); |
| u64 typer; |
| u32 aff; |
| int i; |
| |
| /* |
| * Convert affinity to a 32bit value that can be matched to |
| * GICR_TYPER bits [63:32]. |
| */ |
| aff = (MPIDR_AFFINITY_LEVEL(mpidr, 3) << 24 | |
| MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 | |
| MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 | |
| MPIDR_AFFINITY_LEVEL(mpidr, 0)); |
| |
| for (i = 0; i < gic_data.nr_redist_regions; i++) { |
| void __iomem *ptr = gic_data.redist_regions[i].redist_base; |
| u32 reg; |
| |
| reg = readl_relaxed(ptr + GICR_PIDR2) & GIC_PIDR2_ARCH_MASK; |
| if (reg != GIC_PIDR2_ARCH_GICv3 && |
| reg != GIC_PIDR2_ARCH_GICv4) { /* We're in trouble... */ |
| pr_warn("No redistributor present @%p\n", ptr); |
| break; |
| } |
| |
| do { |
| typer = gic_read_typer(ptr + GICR_TYPER); |
| if ((typer >> 32) == aff) { |
| u64 offset = ptr - gic_data.redist_regions[i].redist_base; |
| gic_data_rdist_rd_base() = ptr; |
| gic_data_rdist()->phys_base = gic_data.redist_regions[i].phys_base + offset; |
| pr_info("CPU%d: found redistributor %lx region %d:%pa\n", |
| smp_processor_id(), mpidr, i, |
| &gic_data_rdist()->phys_base); |
| return 0; |
| } |
| |
| if (gic_data.redist_regions[i].single_redist) |
| break; |
| |
| if (gic_data.redist_stride) { |
| ptr += gic_data.redist_stride; |
| } else { |
| ptr += SZ_64K * 2; /* Skip RD_base + SGI_base */ |
| if (typer & GICR_TYPER_VLPIS) |
| ptr += SZ_64K * 2; /* Skip VLPI_base + reserved page */ |
| } |
| } while (!(typer & GICR_TYPER_LAST)); |
| } |
| |
| /* We couldn't even deal with ourselves... */ |
| WARN(true, "CPU%d: mpidr %lx has no re-distributor!\n", |
| smp_processor_id(), mpidr); |
| return -ENODEV; |
| } |
| |
| static void gic_cpu_sys_reg_init(void) |
| { |
| /* |
| * Need to check that the SRE bit has actually been set. If |
| * not, it means that SRE is disabled at EL2. We're going to |
| * die painfully, and there is nothing we can do about it. |
| * |
| * Kindly inform the luser. |
| */ |
| if (!gic_enable_sre()) |
| pr_err("GIC: unable to set SRE (disabled at EL2), panic ahead\n"); |
| |
| /* Set priority mask register */ |
| gic_write_pmr(DEFAULT_PMR_VALUE); |
| |
| if (static_key_true(&supports_deactivate)) { |
| /* EOI drops priority only (mode 1) */ |
| gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop); |
| } else { |
| /* EOI deactivates interrupt too (mode 0) */ |
| gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop_dir); |
| } |
| |
| /* ... and let's hit the road... */ |
| gic_write_grpen1(1); |
| } |
| |
| static int gic_dist_supports_lpis(void) |
| { |
| return !!(readl_relaxed(gic_data.dist_base + GICD_TYPER) & GICD_TYPER_LPIS); |
| } |
| |
| static void gic_cpu_init(void) |
| { |
| void __iomem *rbase; |
| |
| /* Register ourselves with the rest of the world */ |
| if (gic_populate_rdist()) |
| return; |
| |
| gic_enable_redist(true); |
| |
| rbase = gic_data_rdist_sgi_base(); |
| |
| gic_cpu_config(rbase, gic_redist_wait_for_rwp); |
| |
| /* Give LPIs a spin */ |
| if (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) && gic_dist_supports_lpis()) |
| its_cpu_init(); |
| |
| /* initialise system registers */ |
| gic_cpu_sys_reg_init(); |
| } |
| |
| #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(); |
| 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, |
| }; |
| |
| static u16 gic_compute_target_list(int *base_cpu, const struct cpumask *mask, |
| unsigned long cluster_id) |
| { |
| int cpu = *base_cpu; |
| unsigned long mpidr = cpu_logical_map(cpu); |
| u16 tlist = 0; |
| |
| while (cpu < nr_cpu_ids) { |
| /* |
| * If we ever get a cluster of more than 16 CPUs, just |
| * scream and skip that CPU. |
| */ |
| if (WARN_ON((mpidr & 0xff) >= 16)) |
| goto out; |
| |
| tlist |= 1 << (mpidr & 0xf); |
| |
| cpu = cpumask_next(cpu, mask); |
| if (cpu >= nr_cpu_ids) |
| goto out; |
| |
| mpidr = cpu_logical_map(cpu); |
| |
| if (cluster_id != (mpidr & ~0xffUL)) { |
| cpu--; |
| goto out; |
| } |
| } |
| out: |
| *base_cpu = cpu; |
| return tlist; |
| } |
| |
| #define MPIDR_TO_SGI_AFFINITY(cluster_id, level) \ |
| (MPIDR_AFFINITY_LEVEL(cluster_id, level) \ |
| << ICC_SGI1R_AFFINITY_## level ##_SHIFT) |
| |
| static void gic_send_sgi(u64 cluster_id, u16 tlist, unsigned int irq) |
| { |
| u64 val; |
| |
| val = (MPIDR_TO_SGI_AFFINITY(cluster_id, 3) | |
| MPIDR_TO_SGI_AFFINITY(cluster_id, 2) | |
| irq << ICC_SGI1R_SGI_ID_SHIFT | |
| MPIDR_TO_SGI_AFFINITY(cluster_id, 1) | |
| tlist << ICC_SGI1R_TARGET_LIST_SHIFT); |
| |
| pr_debug("CPU%d: ICC_SGI1R_EL1 %llx\n", smp_processor_id(), val); |
| gic_write_sgi1r(val); |
| } |
| |
| static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq) |
| { |
| int cpu; |
| |
| if (WARN_ON(irq >= 16)) |
| return; |
| |
| /* |
| * Ensure that stores to Normal memory are visible to the |
| * other CPUs before issuing the IPI. |
| */ |
| smp_wmb(); |
| |
| for_each_cpu(cpu, mask) { |
| unsigned long cluster_id = cpu_logical_map(cpu) & ~0xffUL; |
| u16 tlist; |
| |
| tlist = gic_compute_target_list(&cpu, mask, cluster_id); |
| gic_send_sgi(cluster_id, tlist, irq); |
| } |
| |
| /* Force the above writes to ICC_SGI1R_EL1 to be executed */ |
| isb(); |
| } |
| |
| static void gic_smp_init(void) |
| { |
| set_smp_cross_call(gic_raise_softirq); |
| register_cpu_notifier(&gic_cpu_notifier); |
| } |
| |
| static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val, |
| bool force) |
| { |
| unsigned int cpu = cpumask_any_and(mask_val, cpu_online_mask); |
| void __iomem *reg; |
| int enabled; |
| u64 val; |
| |
| if (gic_irq_in_rdist(d)) |
| return -EINVAL; |
| |
| /* If interrupt was enabled, disable it first */ |
| enabled = gic_peek_irq(d, GICD_ISENABLER); |
| if (enabled) |
| gic_mask_irq(d); |
| |
| reg = gic_dist_base(d) + GICD_IROUTER + (gic_irq(d) * 8); |
| val = gic_mpidr_to_affinity(cpu_logical_map(cpu)); |
| |
| gic_write_irouter(val, reg); |
| |
| /* |
| * If the interrupt was enabled, enabled it again. Otherwise, |
| * just wait for the distributor to have digested our changes. |
| */ |
| if (enabled) |
| gic_unmask_irq(d); |
| else |
| gic_dist_wait_for_rwp(); |
| |
| return IRQ_SET_MASK_OK_DONE; |
| } |
| #else |
| #define gic_set_affinity NULL |
| #define gic_smp_init() do { } while(0) |
| #endif |
| |
| #ifdef CONFIG_CPU_PM |
| static int gic_cpu_pm_notifier(struct notifier_block *self, |
| unsigned long cmd, void *v) |
| { |
| if (cmd == CPU_PM_EXIT) { |
| gic_enable_redist(true); |
| gic_cpu_sys_reg_init(); |
| } else if (cmd == CPU_PM_ENTER) { |
| gic_write_grpen1(0); |
| gic_enable_redist(false); |
| } |
| return NOTIFY_OK; |
| } |
| |
| static struct notifier_block gic_cpu_pm_notifier_block = { |
| .notifier_call = gic_cpu_pm_notifier, |
| }; |
| |
| static void gic_cpu_pm_init(void) |
| { |
| cpu_pm_register_notifier(&gic_cpu_pm_notifier_block); |
| } |
| |
| #else |
| static inline void gic_cpu_pm_init(void) { } |
| #endif /* CONFIG_CPU_PM */ |
| |
| static struct irq_chip gic_chip = { |
| .name = "GICv3", |
| .irq_mask = gic_mask_irq, |
| .irq_unmask = gic_unmask_irq, |
| .irq_eoi = gic_eoi_irq, |
| .irq_set_type = gic_set_type, |
| .irq_set_affinity = gic_set_affinity, |
| .irq_get_irqchip_state = gic_irq_get_irqchip_state, |
| .irq_set_irqchip_state = gic_irq_set_irqchip_state, |
| .flags = IRQCHIP_SET_TYPE_MASKED, |
| }; |
| |
| static struct irq_chip gic_eoimode1_chip = { |
| .name = "GICv3", |
| .irq_mask = gic_eoimode1_mask_irq, |
| .irq_unmask = gic_unmask_irq, |
| .irq_eoi = gic_eoimode1_eoi_irq, |
| .irq_set_type = gic_set_type, |
| .irq_set_affinity = gic_set_affinity, |
| .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, |
| }; |
| |
| #define GIC_ID_NR (1U << gic_data.rdists.id_bits) |
| |
| 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)) |
| chip = &gic_eoimode1_chip; |
| |
| /* SGIs are private to the core kernel */ |
| if (hw < 16) |
| return -EPERM; |
| /* Nothing here */ |
| if (hw >= gic_data.irq_nr && hw < 8192) |
| return -EPERM; |
| /* Off limits */ |
| if (hw >= GIC_ID_NR) |
| return -EPERM; |
| |
| /* PPIs */ |
| 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); |
| } |
| /* SPIs */ |
| if (hw >= 32 && hw < gic_data.irq_nr) { |
| irq_domain_set_info(d, irq, hw, chip, d->host_data, |
| handle_fasteoi_irq, NULL, NULL); |
| irq_set_probe(irq); |
| } |
| /* LPIs */ |
| if (hw >= 8192 && hw < GIC_ID_NR) { |
| if (!gic_dist_supports_lpis()) |
| return -EPERM; |
| irq_domain_set_info(d, irq, hw, chip, d->host_data, |
| handle_fasteoi_irq, NULL, NULL); |
| } |
| |
| return 0; |
| } |
| |
| 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; |
| |
| switch (fwspec->param[0]) { |
| case 0: /* SPI */ |
| *hwirq = fwspec->param[1] + 32; |
| break; |
| case 1: /* PPI */ |
| *hwirq = fwspec->param[1] + 16; |
| break; |
| case GIC_IRQ_TYPE_LPI: /* LPI */ |
| *hwirq = fwspec->param[1]; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK; |
| return 0; |
| } |
| |
| if (is_fwnode_irqchip(fwspec->fwnode)) { |
| if(fwspec->param_count != 2) |
| return -EINVAL; |
| |
| *hwirq = fwspec->param[0]; |
| *type = fwspec->param[1]; |
| 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++) |
| gic_irq_domain_map(domain, virq + i, hwirq + i); |
| |
| return 0; |
| } |
| |
| static void gic_irq_domain_free(struct irq_domain *domain, unsigned int virq, |
| unsigned int nr_irqs) |
| { |
| int i; |
| |
| for (i = 0; i < nr_irqs; i++) { |
| struct irq_data *d = irq_domain_get_irq_data(domain, virq + i); |
| irq_set_handler(virq + i, NULL); |
| irq_domain_reset_irq_data(d); |
| } |
| } |
| |
| static int gic_irq_domain_select(struct irq_domain *d, |
| struct irq_fwspec *fwspec, |
| enum irq_domain_bus_token bus_token) |
| { |
| /* Not for us */ |
| if (fwspec->fwnode != d->fwnode) |
| return 0; |
| |
| /* If this is not DT, then we have a single domain */ |
| if (!is_of_node(fwspec->fwnode)) |
| return 1; |
| |
| /* |
| * If this is a PPI and we have a 4th (non-null) parameter, |
| * then we need to match the partition domain. |
| */ |
| if (fwspec->param_count >= 4 && |
| fwspec->param[0] == 1 && fwspec->param[3] != 0) |
| return d == partition_get_domain(gic_data.ppi_descs[fwspec->param[1]]); |
| |
| return d == gic_data.domain; |
| } |
| |
| static const struct irq_domain_ops gic_irq_domain_ops = { |
| .translate = gic_irq_domain_translate, |
| .alloc = gic_irq_domain_alloc, |
| .free = gic_irq_domain_free, |
| .select = gic_irq_domain_select, |
| }; |
| |
| static int partition_domain_translate(struct irq_domain *d, |
| struct irq_fwspec *fwspec, |
| unsigned long *hwirq, |
| unsigned int *type) |
| { |
| struct device_node *np; |
| int ret; |
| |
| np = of_find_node_by_phandle(fwspec->param[3]); |
| if (WARN_ON(!np)) |
| return -EINVAL; |
| |
| ret = partition_translate_id(gic_data.ppi_descs[fwspec->param[1]], |
| of_node_to_fwnode(np)); |
| if (ret < 0) |
| return ret; |
| |
| *hwirq = ret; |
| *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK; |
| |
| return 0; |
| } |
| |
| static const struct irq_domain_ops partition_domain_ops = { |
| .translate = partition_domain_translate, |
| .select = gic_irq_domain_select, |
| }; |
| |
| static void gicv3_enable_quirks(void) |
| { |
| #ifdef CONFIG_ARM64 |
| if (cpus_have_cap(ARM64_WORKAROUND_CAVIUM_23154)) |
| static_branch_enable(&is_cavium_thunderx); |
| #endif |
| } |
| |
| static int __init gic_init_bases(void __iomem *dist_base, |
| struct redist_region *rdist_regs, |
| u32 nr_redist_regions, |
| u64 redist_stride, |
| struct fwnode_handle *handle) |
| { |
| struct device_node *node; |
| u32 typer; |
| int gic_irqs; |
| int err; |
| |
| if (!is_hyp_mode_available()) |
| static_key_slow_dec(&supports_deactivate); |
| |
| if (static_key_true(&supports_deactivate)) |
| pr_info("GIC: Using split EOI/Deactivate mode\n"); |
| |
| gic_data.fwnode = handle; |
| gic_data.dist_base = dist_base; |
| gic_data.redist_regions = rdist_regs; |
| gic_data.nr_redist_regions = nr_redist_regions; |
| gic_data.redist_stride = redist_stride; |
| |
| gicv3_enable_quirks(); |
| |
| /* |
| * Find out how many interrupts are supported. |
| * The GIC only supports up to 1020 interrupt sources (SGI+PPI+SPI) |
| */ |
| typer = readl_relaxed(gic_data.dist_base + GICD_TYPER); |
| gic_data.rdists.id_bits = GICD_TYPER_ID_BITS(typer); |
| gic_irqs = GICD_TYPER_IRQS(typer); |
| if (gic_irqs > 1020) |
| gic_irqs = 1020; |
| gic_data.irq_nr = gic_irqs; |
| |
| gic_data.domain = irq_domain_create_tree(handle, &gic_irq_domain_ops, |
| &gic_data); |
| gic_data.rdists.rdist = alloc_percpu(typeof(*gic_data.rdists.rdist)); |
| |
| if (WARN_ON(!gic_data.domain) || WARN_ON(!gic_data.rdists.rdist)) { |
| err = -ENOMEM; |
| goto out_free; |
| } |
| |
| set_handle_irq(gic_handle_irq); |
| |
| node = to_of_node(handle); |
| if (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) && gic_dist_supports_lpis() && |
| node) /* Temp hack to prevent ITS init for ACPI */ |
| its_init(node, &gic_data.rdists, gic_data.domain); |
| |
| gic_smp_init(); |
| gic_dist_init(); |
| gic_cpu_init(); |
| gic_cpu_pm_init(); |
| |
| return 0; |
| |
| out_free: |
| if (gic_data.domain) |
| irq_domain_remove(gic_data.domain); |
| free_percpu(gic_data.rdists.rdist); |
| return err; |
| } |
| |
| static int __init gic_validate_dist_version(void __iomem *dist_base) |
| { |
| u32 reg = readl_relaxed(dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK; |
| |
| if (reg != GIC_PIDR2_ARCH_GICv3 && reg != GIC_PIDR2_ARCH_GICv4) |
| return -ENODEV; |
| |
| return 0; |
| } |
| |
| static int get_cpu_number(struct device_node *dn) |
| { |
| const __be32 *cell; |
| u64 hwid; |
| int i; |
| |
| cell = of_get_property(dn, "reg", NULL); |
| if (!cell) |
| return -1; |
| |
| hwid = of_read_number(cell, of_n_addr_cells(dn)); |
| |
| /* |
| * Non affinity bits must be set to 0 in the DT |
| */ |
| if (hwid & ~MPIDR_HWID_BITMASK) |
| return -1; |
| |
| for (i = 0; i < num_possible_cpus(); i++) |
| if (cpu_logical_map(i) == hwid) |
| return i; |
| |
| return -1; |
| } |
| |
| /* Create all possible partitions at boot time */ |
| static void gic_populate_ppi_partitions(struct device_node *gic_node) |
| { |
| struct device_node *parts_node, *child_part; |
| int part_idx = 0, i; |
| int nr_parts; |
| struct partition_affinity *parts; |
| |
| parts_node = of_find_node_by_name(gic_node, "ppi-partitions"); |
| if (!parts_node) |
| return; |
| |
| nr_parts = of_get_child_count(parts_node); |
| |
| if (!nr_parts) |
| return; |
| |
| parts = kzalloc(sizeof(*parts) * nr_parts, GFP_KERNEL); |
| if (WARN_ON(!parts)) |
| return; |
| |
| for_each_child_of_node(parts_node, child_part) { |
| struct partition_affinity *part; |
| int n; |
| |
| part = &parts[part_idx]; |
| |
| part->partition_id = of_node_to_fwnode(child_part); |
| |
| pr_info("GIC: PPI partition %s[%d] { ", |
| child_part->name, part_idx); |
| |
| n = of_property_count_elems_of_size(child_part, "affinity", |
| sizeof(u32)); |
| WARN_ON(n <= 0); |
| |
| for (i = 0; i < n; i++) { |
| int err, cpu; |
| u32 cpu_phandle; |
| struct device_node *cpu_node; |
| |
| err = of_property_read_u32_index(child_part, "affinity", |
| i, &cpu_phandle); |
| if (WARN_ON(err)) |
| continue; |
| |
| cpu_node = of_find_node_by_phandle(cpu_phandle); |
| if (WARN_ON(!cpu_node)) |
| continue; |
| |
| cpu = get_cpu_number(cpu_node); |
| if (WARN_ON(cpu == -1)) |
| continue; |
| |
| pr_cont("%s[%d] ", cpu_node->full_name, cpu); |
| |
| cpumask_set_cpu(cpu, &part->mask); |
| } |
| |
| pr_cont("}\n"); |
| part_idx++; |
| } |
| |
| for (i = 0; i < 16; i++) { |
| unsigned int irq; |
| struct partition_desc *desc; |
| struct irq_fwspec ppi_fwspec = { |
| .fwnode = gic_data.fwnode, |
| .param_count = 3, |
| .param = { |
| [0] = 1, |
| [1] = i, |
| [2] = IRQ_TYPE_NONE, |
| }, |
| }; |
| |
| irq = irq_create_fwspec_mapping(&ppi_fwspec); |
| if (WARN_ON(!irq)) |
| continue; |
| desc = partition_create_desc(gic_data.fwnode, parts, nr_parts, |
| irq, &partition_domain_ops); |
| if (WARN_ON(!desc)) |
| continue; |
| |
| gic_data.ppi_descs[i] = desc; |
| } |
| } |
| |
| static int __init gic_of_init(struct device_node *node, struct device_node *parent) |
| { |
| void __iomem *dist_base; |
| struct redist_region *rdist_regs; |
| u64 redist_stride; |
| u32 nr_redist_regions; |
| int err, i; |
| |
| dist_base = of_iomap(node, 0); |
| if (!dist_base) { |
| pr_err("%s: unable to map gic dist registers\n", |
| node->full_name); |
| return -ENXIO; |
| } |
| |
| err = gic_validate_dist_version(dist_base); |
| if (err) { |
| pr_err("%s: no distributor detected, giving up\n", |
| node->full_name); |
| goto out_unmap_dist; |
| } |
| |
| if (of_property_read_u32(node, "#redistributor-regions", &nr_redist_regions)) |
| nr_redist_regions = 1; |
| |
| rdist_regs = kzalloc(sizeof(*rdist_regs) * nr_redist_regions, GFP_KERNEL); |
| if (!rdist_regs) { |
| err = -ENOMEM; |
| goto out_unmap_dist; |
| } |
| |
| for (i = 0; i < nr_redist_regions; i++) { |
| struct resource res; |
| int ret; |
| |
| ret = of_address_to_resource(node, 1 + i, &res); |
| rdist_regs[i].redist_base = of_iomap(node, 1 + i); |
| if (ret || !rdist_regs[i].redist_base) { |
| pr_err("%s: couldn't map region %d\n", |
| node->full_name, i); |
| err = -ENODEV; |
| goto out_unmap_rdist; |
| } |
| rdist_regs[i].phys_base = res.start; |
| } |
| |
| if (of_property_read_u64(node, "redistributor-stride", &redist_stride)) |
| redist_stride = 0; |
| |
| err = gic_init_bases(dist_base, rdist_regs, nr_redist_regions, |
| redist_stride, &node->fwnode); |
| if (err) |
| goto out_unmap_rdist; |
| |
| gic_populate_ppi_partitions(node); |
| return 0; |
| |
| out_unmap_rdist: |
| for (i = 0; i < nr_redist_regions; i++) |
| if (rdist_regs[i].redist_base) |
| iounmap(rdist_regs[i].redist_base); |
| kfree(rdist_regs); |
| out_unmap_dist: |
| iounmap(dist_base); |
| return err; |
| } |
| |
| IRQCHIP_DECLARE(gic_v3, "arm,gic-v3", gic_of_init); |
| |
| #ifdef CONFIG_ACPI |
| static void __iomem *dist_base; |
| static struct redist_region *redist_regs __initdata; |
| static u32 nr_redist_regions __initdata; |
| static bool single_redist; |
| |
| static void __init |
| gic_acpi_register_redist(phys_addr_t phys_base, void __iomem *redist_base) |
| { |
| static int count = 0; |
| |
| redist_regs[count].phys_base = phys_base; |
| redist_regs[count].redist_base = redist_base; |
| redist_regs[count].single_redist = single_redist; |
| count++; |
| } |
| |
| static int __init |
| gic_acpi_parse_madt_redist(struct acpi_subtable_header *header, |
| const unsigned long end) |
| { |
| struct acpi_madt_generic_redistributor *redist = |
| (struct acpi_madt_generic_redistributor *)header; |
| void __iomem *redist_base; |
| |
| redist_base = ioremap(redist->base_address, redist->length); |
| if (!redist_base) { |
| pr_err("Couldn't map GICR region @%llx\n", redist->base_address); |
| return -ENOMEM; |
| } |
| |
| gic_acpi_register_redist(redist->base_address, redist_base); |
| return 0; |
| } |
| |
| static int __init |
| gic_acpi_parse_madt_gicc(struct acpi_subtable_header *header, |
| const unsigned long end) |
| { |
| struct acpi_madt_generic_interrupt *gicc = |
| (struct acpi_madt_generic_interrupt *)header; |
| u32 reg = readl_relaxed(dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK; |
| u32 size = reg == GIC_PIDR2_ARCH_GICv4 ? SZ_64K * 4 : SZ_64K * 2; |
| void __iomem *redist_base; |
| |
| redist_base = ioremap(gicc->gicr_base_address, size); |
| if (!redist_base) |
| return -ENOMEM; |
| |
| gic_acpi_register_redist(gicc->gicr_base_address, redist_base); |
| return 0; |
| } |
| |
| static int __init gic_acpi_collect_gicr_base(void) |
| { |
| acpi_tbl_entry_handler redist_parser; |
| enum acpi_madt_type type; |
| |
| if (single_redist) { |
| type = ACPI_MADT_TYPE_GENERIC_INTERRUPT; |
| redist_parser = gic_acpi_parse_madt_gicc; |
| } else { |
| type = ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR; |
| redist_parser = gic_acpi_parse_madt_redist; |
| } |
| |
| /* Collect redistributor base addresses in GICR entries */ |
| if (acpi_table_parse_madt(type, redist_parser, 0) > 0) |
| return 0; |
| |
| pr_info("No valid GICR entries exist\n"); |
| return -ENODEV; |
| } |
| |
| static int __init gic_acpi_match_gicr(struct acpi_subtable_header *header, |
| const unsigned long end) |
| { |
| /* Subtable presence means that redist exists, that's it */ |
| return 0; |
| } |
| |
| static int __init gic_acpi_match_gicc(struct acpi_subtable_header *header, |
| const unsigned long end) |
| { |
| struct acpi_madt_generic_interrupt *gicc = |
| (struct acpi_madt_generic_interrupt *)header; |
| |
| /* |
| * If GICC is enabled and has valid gicr base address, then it means |
| * GICR base is presented via GICC |
| */ |
| if ((gicc->flags & ACPI_MADT_ENABLED) && gicc->gicr_base_address) |
| return 0; |
| |
| return -ENODEV; |
| } |
| |
| static int __init gic_acpi_count_gicr_regions(void) |
| { |
| int count; |
| |
| /* |
| * Count how many redistributor regions we have. It is not allowed |
| * to mix redistributor description, GICR and GICC subtables have to be |
| * mutually exclusive. |
| */ |
| count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR, |
| gic_acpi_match_gicr, 0); |
| if (count > 0) { |
| single_redist = false; |
| return count; |
| } |
| |
| count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT, |
| gic_acpi_match_gicc, 0); |
| if (count > 0) |
| single_redist = true; |
| |
| return count; |
| } |
| |
| static bool __init acpi_validate_gic_table(struct acpi_subtable_header *header, |
| struct acpi_probe_entry *ape) |
| { |
| struct acpi_madt_generic_distributor *dist; |
| int count; |
| |
| dist = (struct acpi_madt_generic_distributor *)header; |
| if (dist->version != ape->driver_data) |
| return false; |
| |
| /* We need to do that exercise anyway, the sooner the better */ |
| count = gic_acpi_count_gicr_regions(); |
| if (count <= 0) |
| return false; |
| |
| nr_redist_regions = count; |
| return true; |
| } |
| |
| #define ACPI_GICV3_DIST_MEM_SIZE (SZ_64K) |
| |
| static int __init |
| gic_acpi_init(struct acpi_subtable_header *header, const unsigned long end) |
| { |
| struct acpi_madt_generic_distributor *dist; |
| struct fwnode_handle *domain_handle; |
| int i, err; |
| |
| /* Get distributor base address */ |
| dist = (struct acpi_madt_generic_distributor *)header; |
| dist_base = ioremap(dist->base_address, ACPI_GICV3_DIST_MEM_SIZE); |
| if (!dist_base) { |
| pr_err("Unable to map GICD registers\n"); |
| return -ENOMEM; |
| } |
| |
| err = gic_validate_dist_version(dist_base); |
| if (err) { |
| pr_err("No distributor detected at @%p, giving up", dist_base); |
| goto out_dist_unmap; |
| } |
| |
| redist_regs = kzalloc(sizeof(*redist_regs) * nr_redist_regions, |
| GFP_KERNEL); |
| if (!redist_regs) { |
| err = -ENOMEM; |
| goto out_dist_unmap; |
| } |
| |
| err = gic_acpi_collect_gicr_base(); |
| if (err) |
| goto out_redist_unmap; |
| |
| domain_handle = irq_domain_alloc_fwnode(dist_base); |
| if (!domain_handle) { |
| err = -ENOMEM; |
| goto out_redist_unmap; |
| } |
| |
| err = gic_init_bases(dist_base, redist_regs, nr_redist_regions, 0, |
| domain_handle); |
| if (err) |
| goto out_fwhandle_free; |
| |
| acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle); |
| return 0; |
| |
| out_fwhandle_free: |
| irq_domain_free_fwnode(domain_handle); |
| out_redist_unmap: |
| for (i = 0; i < nr_redist_regions; i++) |
| if (redist_regs[i].redist_base) |
| iounmap(redist_regs[i].redist_base); |
| kfree(redist_regs); |
| out_dist_unmap: |
| iounmap(dist_base); |
| return err; |
| } |
| IRQCHIP_ACPI_DECLARE(gic_v3, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR, |
| acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_V3, |
| gic_acpi_init); |
| IRQCHIP_ACPI_DECLARE(gic_v4, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR, |
| acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_V4, |
| gic_acpi_init); |
| IRQCHIP_ACPI_DECLARE(gic_v3_or_v4, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR, |
| acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_NONE, |
| gic_acpi_init); |
| #endif |