diff options
Diffstat (limited to 'arch/arm')
38 files changed, 465 insertions, 272 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index c8d5ec8a939..2686959319a 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1420,6 +1420,31 @@ config SMP_ON_UP If you don't know what to do here, say Y. +config ARM_CPU_TOPOLOGY + bool "Support cpu topology definition" + depends on SMP && CPU_V7 + default y + help + Support ARM cpu topology definition. The MPIDR register defines + affinity between processors which is then used to describe the cpu + topology of an ARM System. + +config SCHED_MC + bool "Multi-core scheduler support" + depends on ARM_CPU_TOPOLOGY + help + Multi-core scheduler support improves the CPU scheduler's decision + making when dealing with multi-core CPU chips at a cost of slightly + increased overhead in some places. If unsure say N here. + +config SCHED_SMT + bool "SMT scheduler support" + depends on ARM_CPU_TOPOLOGY + help + Improves the CPU scheduler's decision making when dealing with + MultiThreading at a cost of slightly increased overhead in some + places. If unsure say N here. + config HAVE_ARM_SCU bool help diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c index 734db99eaee..016c1aeb847 100644 --- a/arch/arm/common/gic.c +++ b/arch/arm/common/gic.c @@ -29,6 +29,9 @@ #include <linux/cpu_pm.h> #include <linux/cpumask.h> #include <linux/io.h> +#include <linux/interrupt.h> +#include <linux/percpu.h> +#include <linux/slab.h> #include <asm/irq.h> #include <asm/mach/irq.h> @@ -181,7 +184,7 @@ static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val, return -EINVAL; mask = 0xff << shift; - bit = 1 << (cpu + shift); + bit = 1 << (cpu_logical_map(cpu) + shift); spin_lock(&irq_controller_lock); val = readl_relaxed(reg) & ~mask; @@ -260,9 +263,16 @@ static void __init gic_dist_init(struct gic_chip_data *gic, unsigned int irq_start) { unsigned int gic_irqs, irq_limit, i; + u32 cpumask; void __iomem *base = gic->dist_base; - u32 cpumask = 1 << smp_processor_id(); + u32 cpu = 0; + u32 nrppis = 0, ppi_base = 0; +#ifdef CONFIG_SMP + cpu = cpu_logical_map(smp_processor_id()); +#endif + + cpumask = 1 << cpu; cpumask |= cpumask << 8; cpumask |= cpumask << 16; @@ -280,6 +290,23 @@ static void __init gic_dist_init(struct gic_chip_data *gic, gic->gic_irqs = gic_irqs; /* + * Nobody would be insane enough to use PPIs on a secondary + * GIC, right? + */ + if (gic == &gic_data[0]) { + nrppis = (32 - irq_start) & 31; + + /* The GIC only supports up to 16 PPIs. */ + if (nrppis > 16) + BUG(); + + ppi_base = gic->irq_offset + 32 - nrppis; + } + + pr_info("Configuring GIC with %d sources (%d PPIs)\n", + gic_irqs, (gic == &gic_data[0]) ? nrppis : 0); + + /* * Set all global interrupts to be level triggered, active low. */ for (i = 32; i < gic_irqs; i += 16) @@ -314,7 +341,17 @@ static void __init gic_dist_init(struct gic_chip_data *gic, /* * Setup the Linux IRQ subsystem. */ - for (i = irq_start; i < irq_limit; i++) { + for (i = 0; i < nrppis; i++) { + int ppi = i + ppi_base; + + irq_set_percpu_devid(ppi); + irq_set_chip_and_handler(ppi, &gic_chip, + handle_percpu_devid_irq); + irq_set_chip_data(ppi, gic); + set_irq_flags(ppi, IRQF_VALID | IRQF_NOAUTOEN); + } + + for (i = irq_start + nrppis; i < irq_limit; i++) { irq_set_chip_and_handler(i, &gic_chip, handle_fasteoi_irq); irq_set_chip_data(i, gic); set_irq_flags(i, IRQF_VALID | IRQF_PROBE); @@ -557,20 +594,15 @@ void __cpuinit gic_secondary_init(unsigned int gic_nr) gic_cpu_init(&gic_data[gic_nr]); } -void __cpuinit gic_enable_ppi(unsigned int irq) -{ - unsigned long flags; - - local_irq_save(flags); - irq_set_status_flags(irq, IRQ_NOPROBE); - gic_unmask_irq(irq_get_irq_data(irq)); - local_irq_restore(flags); -} - #ifdef CONFIG_SMP void gic_raise_softirq(const struct cpumask *mask, unsigned int irq) { - unsigned long map = *cpus_addr(*mask); + int cpu; + unsigned long map = 0; + + /* Convert our logical CPU mask into a physical one. */ + for_each_cpu(cpu, mask) + map |= 1 << cpu_logical_map(cpu); /* * Ensure that stores to Normal memory are visible to the diff --git a/arch/arm/include/asm/cputype.h b/arch/arm/include/asm/cputype.h index cd4458f6417..cb47d28cbe1 100644 --- a/arch/arm/include/asm/cputype.h +++ b/arch/arm/include/asm/cputype.h @@ -8,6 +8,7 @@ #define CPUID_CACHETYPE 1 #define CPUID_TCM 2 #define CPUID_TLBTYPE 3 +#define CPUID_MPIDR 5 #define CPUID_EXT_PFR0 "c1, 0" #define CPUID_EXT_PFR1 "c1, 1" @@ -70,6 +71,11 @@ static inline unsigned int __attribute_const__ read_cpuid_tcmstatus(void) return read_cpuid(CPUID_TCM); } +static inline unsigned int __attribute_const__ read_cpuid_mpidr(void) +{ + return read_cpuid(CPUID_MPIDR); +} + /* * Intel's XScale3 core supports some v6 features (supersections, L2) * but advertises itself as v5 as it does not support the v6 ISA. For diff --git a/arch/arm/include/asm/entry-macro-multi.S b/arch/arm/include/asm/entry-macro-multi.S index 2f1e2098dfe..88d61815f0c 100644 --- a/arch/arm/include/asm/entry-macro-multi.S +++ b/arch/arm/include/asm/entry-macro-multi.S @@ -25,13 +25,6 @@ movne r1, sp adrne lr, BSYM(1b) bne do_IPI - -#ifdef CONFIG_LOCAL_TIMERS - test_for_ltirq r0, r2, r6, lr - movne r0, sp - adrne lr, BSYM(1b) - bne do_local_timer -#endif #endif 9997: .endm diff --git a/arch/arm/include/asm/exception.h b/arch/arm/include/asm/exception.h new file mode 100644 index 00000000000..5abaf5bbd98 --- /dev/null +++ b/arch/arm/include/asm/exception.h @@ -0,0 +1,19 @@ +/* + * Annotations for marking C functions as exception handlers. + * + * These should only be used for C functions that are called from the low + * level exception entry code and not any intervening C code. + */ +#ifndef __ASM_ARM_EXCEPTION_H +#define __ASM_ARM_EXCEPTION_H + +#include <linux/ftrace.h> + +#define __exception __attribute__((section(".exception.text"))) +#ifdef CONFIG_FUNCTION_GRAPH_TRACER +#define __exception_irq_entry __irq_entry +#else +#define __exception_irq_entry __exception +#endif + +#endif /* __ASM_ARM_EXCEPTION_H */ diff --git a/arch/arm/include/asm/hardirq.h b/arch/arm/include/asm/hardirq.h index 89ad1805e57..ddf07a92a6c 100644 --- a/arch/arm/include/asm/hardirq.h +++ b/arch/arm/include/asm/hardirq.h @@ -9,9 +9,6 @@ typedef struct { unsigned int __softirq_pending; -#ifdef CONFIG_LOCAL_TIMERS - unsigned int local_timer_irqs; -#endif #ifdef CONFIG_SMP unsigned int ipi_irqs[NR_IPI]; #endif diff --git a/arch/arm/include/asm/hardware/entry-macro-gic.S b/arch/arm/include/asm/hardware/entry-macro-gic.S index c115b82fe80..74ebc803904 100644 --- a/arch/arm/include/asm/hardware/entry-macro-gic.S +++ b/arch/arm/include/asm/hardware/entry-macro-gic.S @@ -22,15 +22,11 @@ * interrupt controller spec. To wit: * * Interrupts 0-15 are IPI - * 16-28 are reserved - * 29-31 are local. We allow 30 to be used for the watchdog. + * 16-31 are local. We allow 30 to be used for the watchdog. * 32-1020 are global * 1021-1022 are reserved * 1023 is "spurious" (no interrupt) * - * For now, we ignore all local interrupts so only return an interrupt if it's - * between 30 and 1020. The test_for_ipi routine below will pick up on IPIs. - * * A simple read from the controller will tell us the number of the highest * priority enabled interrupt. We then just need to check whether it is in the * valid range for an IRQ (30-1020 inclusive). @@ -43,7 +39,7 @@ ldr \tmp, =1021 bic \irqnr, \irqstat, #0x1c00 - cmp \irqnr, #29 + cmp \irqnr, #15 cmpcc \irqnr, \irqnr cmpne \irqnr, \tmp cmpcs \irqnr, \irqnr @@ -62,14 +58,3 @@ strcc \irqstat, [\base, #GIC_CPU_EOI] cmpcs \irqnr, \irqnr .endm - -/* As above, this assumes that irqstat and base are preserved.. */ - - .macro test_for_ltirq, irqnr, irqstat, base, tmp - bic \irqnr, \irqstat, #0x1c00 - mov \tmp, #0 - cmp \irqnr, #29 - moveq \tmp, #1 - streq \irqstat, [\base, #GIC_CPU_EOI] - cmp \tmp, #0 - .endm diff --git a/arch/arm/include/asm/hardware/gic.h b/arch/arm/include/asm/hardware/gic.h index c5627057b1c..14867e12f20 100644 --- a/arch/arm/include/asm/hardware/gic.h +++ b/arch/arm/include/asm/hardware/gic.h @@ -40,7 +40,6 @@ void gic_init(unsigned int, unsigned int, void __iomem *, void __iomem *); void gic_secondary_init(unsigned int); void gic_cascade_irq(unsigned int gic_nr, unsigned int irq); void gic_raise_softirq(const struct cpumask *mask, unsigned int irq); -void gic_enable_ppi(unsigned int); struct gic_chip_data { unsigned int irq_offset; diff --git a/arch/arm/include/asm/localtimer.h b/arch/arm/include/asm/localtimer.h index 080d74f8128..f5e1cec7e35 100644 --- a/arch/arm/include/asm/localtimer.h +++ b/arch/arm/include/asm/localtimer.h @@ -10,6 +10,8 @@ #ifndef __ASM_ARM_LOCALTIMER_H #define __ASM_ARM_LOCALTIMER_H +#include <linux/interrupt.h> + struct clock_event_device; /* @@ -17,27 +19,20 @@ struct clock_event_device; */ void percpu_timer_setup(void); -/* - * Called from assembly, this is the local timer IRQ handler - */ -asmlinkage void do_local_timer(struct pt_regs *); - - #ifdef CONFIG_LOCAL_TIMERS #ifdef CONFIG_HAVE_ARM_TWD #include "smp_twd.h" -#define local_timer_ack() twd_timer_ack() +#define local_timer_stop(c) twd_timer_stop((c)) #else /* - * Platform provides this to acknowledge a local timer IRQ. - * Returns true if the local timer IRQ is to be processed. + * Stop the local timer */ -int local_timer_ack(void); +void local_timer_stop(struct clock_event_device *); #endif @@ -52,6 +47,10 @@ static inline int local_timer_setup(struct clock_event_device *evt) { return -ENXIO; } + +static inline void local_timer_stop(struct clock_event_device *evt) +{ +} #endif #endif diff --git a/arch/arm/include/asm/smp.h b/arch/arm/include/asm/smp.h index e42d96a45d3..1e5717afc4a 100644 --- a/arch/arm/include/asm/smp.h +++ b/arch/arm/include/asm/smp.h @@ -33,6 +33,11 @@ extern void show_ipi_list(struct seq_file *, int); asmlinkage void do_IPI(int ipinr, struct pt_regs *regs); /* + * Called from C code, this handles an IPI. + */ +void handle_IPI(int ipinr, struct pt_regs *regs); + +/* * Setup the set of possible CPUs (via set_cpu_possible) */ extern void smp_init_cpus(void); @@ -66,6 +71,12 @@ extern void platform_secondary_init(unsigned int cpu); extern void platform_smp_prepare_cpus(unsigned int); /* + * Logical CPU mapping. + */ +extern int __cpu_logical_map[NR_CPUS]; +#define cpu_logical_map(cpu) __cpu_logical_map[cpu] + +/* * Initial data for bringing up a secondary CPU. */ struct secondary_data { @@ -88,9 +99,4 @@ extern void platform_cpu_enable(unsigned int cpu); extern void arch_send_call_function_single_ipi(int cpu); extern void arch_send_call_function_ipi_mask(const struct cpumask *mask); -/* - * show local interrupt info - */ -extern void show_local_irqs(struct seq_file *, int); - #endif /* ifndef __ASM_ARM_SMP_H */ diff --git a/arch/arm/include/asm/smp_twd.h b/arch/arm/include/asm/smp_twd.h index fed9981fba0..ef9ffba97ad 100644 --- a/arch/arm/include/asm/smp_twd.h +++ b/arch/arm/include/asm/smp_twd.h @@ -22,7 +22,7 @@ struct clock_event_device; extern void __iomem *twd_base; -int twd_timer_ack(void); void twd_timer_setup(struct clock_event_device *); +void twd_timer_stop(struct clock_event_device *); #endif diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h index 832888d0c20..ed6b0499a10 100644 --- a/arch/arm/include/asm/system.h +++ b/arch/arm/include/asm/system.h @@ -62,13 +62,6 @@ #include <asm/outercache.h> -#define __exception __attribute__((section(".exception.text"))) -#ifdef CONFIG_FUNCTION_GRAPH_TRACER -#define __exception_irq_entry __irq_entry -#else -#define __exception_irq_entry __exception -#endif - struct thread_info; struct task_struct; diff --git a/arch/arm/include/asm/topology.h b/arch/arm/include/asm/topology.h index accbd7cad9b..a7e457ed27c 100644 --- a/arch/arm/include/asm/topology.h +++ b/arch/arm/include/asm/topology.h @@ -1,6 +1,39 @@ #ifndef _ASM_ARM_TOPOLOGY_H #define _ASM_ARM_TOPOLOGY_H +#ifdef CONFIG_ARM_CPU_TOPOLOGY + +#include <linux/cpumask.h> + +struct cputopo_arm { + int thread_id; + int core_id; + int socket_id; + cpumask_t thread_sibling; + cpumask_t core_sibling; +}; + +extern struct cputopo_arm cpu_topology[NR_CPUS]; + +#define topology_physical_package_id(cpu) (cpu_topology[cpu].socket_id) +#define topology_core_id(cpu) (cpu_topology[cpu].core_id) +#define topology_core_cpumask(cpu) (&cpu_topology[cpu].core_sibling) +#define topology_thread_cpumask(cpu) (&cpu_topology[cpu].thread_sibling) + +#define mc_capable() (cpu_topology[0].socket_id != -1) +#define smt_capable() (cpu_topology[0].thread_id != -1) + +void init_cpu_topology(void); +void store_cpu_topology(unsigned int cpuid); +const struct cpumask *cpu_coregroup_mask(unsigned int cpu); + +#else + +static inline void init_cpu_topology(void) { } +static inline void store_cpu_topology(unsigned int cpuid) { } + +#endif + #include <asm-generic/topology.h> #endif /* _ASM_ARM_TOPOLOGY_H */ diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index 8fa83f54c96..7cac26c5f50 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -73,6 +73,7 @@ obj-$(CONFIG_IWMMXT) += iwmmxt.o obj-$(CONFIG_CPU_HAS_PMU) += pmu.o obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o AFLAGS_iwmmxt.o := -Wa,-mcpu=iwmmxt +obj-$(CONFIG_ARM_CPU_TOPOLOGY) += topology.o ifneq ($(CONFIG_ARCH_EBSA110),y) obj-y += io.o diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c index de3dcab8610..7cb29261249 100644 --- a/arch/arm/kernel/irq.c +++ b/arch/arm/kernel/irq.c @@ -35,8 +35,8 @@ #include <linux/list.h> #include <linux/kallsyms.h> #include <linux/proc_fs.h> -#include <linux/ftrace.h> +#include <asm/exception.h> #include <asm/system.h> #include <asm/mach/arch.h> #include <asm/mach/irq.h> @@ -59,9 +59,6 @@ int arch_show_interrupts(struct seq_file *p, int prec) #ifdef CONFIG_SMP show_ipi_list(p, prec); #endif -#ifdef CONFIG_LOCAL_TIMERS - show_local_irqs(p, prec); -#endif seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count); return 0; } diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index d88ff0230e8..a96c08cd612 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -16,7 +16,6 @@ #include <linux/cache.h> #include <linux/profile.h> #include <linux/errno.h> -#include <linux/ftrace.h> #include <linux/mm.h> #include <linux/err.h> #include <linux/cpu.h> @@ -31,6 +30,8 @@ #include <asm/cacheflush.h> #include <asm/cpu.h> #include <asm/cputype.h> +#include <asm/exception.h> +#include <asm/topology.h> #include <asm/mmu_context.h> #include <asm/pgtable.h> #include <asm/pgalloc.h> @@ -39,6 +40,7 @@ #include <asm/tlbflush.h> #include <asm/ptrace.h> #include <asm/localtimer.h> +#include <asm/smp_plat.h> /* * as from 2.5, kernels no longer have an init_tasks structure @@ -259,6 +261,20 @@ void __ref cpu_die(void) } #endif /* CONFIG_HOTPLUG_CPU */ +int __cpu_logical_map[NR_CPUS]; + +void __init smp_setup_processor_id(void) +{ + int i; + u32 cpu = is_smp() ? read_cpuid_mpidr() & 0xff : 0; + + cpu_logical_map(0) = cpu; + for (i = 1; i < NR_CPUS; ++i) + cpu_logical_map(i) = i == cpu ? 0 : i; + + printk(KERN_INFO "Booting Linux on physical CPU %d\n", cpu); +} + /* * Called by both boot and secondaries to move global data into * per-processor storage. @@ -268,6 +284,8 @@ static void __cpuinit smp_store_cpu_info(unsigned int cpuid) struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpuid); cpu_info->loops_per_jiffy = loops_per_jiffy; + + store_cpu_topology(cpuid); } /* @@ -358,6 +376,8 @@ void __init smp_prepare_cpus(unsigned int max_cpus) { unsigned int ncores = num_possible_cpus(); + init_cpu_topology(); + smp_store_cpu_info(smp_processor_id()); /* @@ -437,10 +457,6 @@ u64 smp_irq_stat_cpu(unsigned int cpu) for (i = 0; i < NR_IPI; i++) sum += __get_irq_stat(cpu, ipi_irqs[i]); -#ifdef CONFIG_LOCAL_TIMERS - sum += __get_irq_stat(cpu, local_timer_irqs); -#endif - return sum; } @@ -457,33 +473,6 @@ static void ipi_timer(void) irq_exit(); } -#ifdef CONFIG_LOCAL_TIMERS -asmlinkage void __exception_irq_entry do_local_timer(struct pt_regs *regs) -{ - struct pt_regs *old_regs = set_irq_regs(regs); - int cpu = smp_processor_id(); - - if (local_timer_ack()) { - __inc_irq_stat(cpu, local_timer_irqs); - ipi_timer(); - } - - set_irq_regs(old_regs); -} - -void show_local_irqs(struct seq_file *p, int prec) -{ - unsigned int cpu; - - seq_printf(p, "%*s: ", prec, "LOC"); - - for_each_present_cpu(cpu) - seq_printf(p, "%10u ", __get_irq_stat(cpu, local_timer_irqs)); - - seq_printf(p, " Local timer interrupts\n"); -} -#endif - #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST static void smp_timer_broadcast(const struct cpumask *mask) { @@ -534,7 +523,7 @@ static void percpu_timer_stop(void) unsigned int cpu = smp_processor_id(); struct clock_event_device *evt = &per_cpu(percpu_clockevent, cpu); - evt->set_mode(CLOCK_EVT_MODE_UNUSED, evt); + local_timer_stop(evt); } #endif @@ -567,6 +556,11 @@ static void ipi_cpu_stop(unsigned int cpu) */ asmlinkage void __exception_irq_entry do_IPI(int ipinr, struct pt_regs *regs) { + handle_IPI(ipinr, regs); +} + +void handle_IPI(int ipinr, struct pt_regs *regs) +{ unsigned int cpu = smp_processor_id(); struct pt_regs *old_regs = set_irq_regs(regs); diff --git a/arch/arm/kernel/smp_scu.c b/arch/arm/kernel/smp_scu.c index 79ed5e7f204..5b6d536cbfe 100644 --- a/arch/arm/kernel/smp_scu.c +++ b/arch/arm/kernel/smp_scu.c @@ -33,7 +33,7 @@ unsigned int __init scu_get_core_count(void __iomem *scu_base) /* * Enable the SCU */ -void __init scu_enable(void __iomem *scu_base) +void scu_enable(void __iomem *scu_base) { u32 scu_ctrl; diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c index 01c186222f3..a8a6682d6b5 100644 --- a/arch/arm/kernel/smp_twd.c +++ b/arch/arm/kernel/smp_twd.c @@ -19,6 +19,7 @@ #include <linux/io.h> #include <asm/smp_twd.h> +#include <asm/localtimer.h> #include <asm/hardware/gic.h> /* set up by the platform code */ @@ -26,6 +27,8 @@ void __iomem *twd_base; static unsigned long twd_timer_rate; +static struct clock_event_device __percpu **twd_evt; + static void twd_set_mode(enum clock_event_mode mode, struct clock_event_device *clk) { @@ -80,6 +83,12 @@ int twd_timer_ack(void) return 0; } +void twd_timer_stop(struct clock_event_device *clk) +{ + twd_set_mode(CLOCK_EVT_MODE_UNUSED, clk); + disable_percpu_irq(clk->irq); +} + static void __cpuinit twd_calibrate_rate(void) { unsigned long count; @@ -119,11 +128,43 @@ static void __cpuinit twd_calibrate_rate(void) } } +static irqreturn_t twd_handler(int irq, void *dev_id) +{ + struct clock_event_device *evt = *(struct clock_event_device **)dev_id; + + if (twd_timer_ack()) { + evt->event_handler(evt); + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + /* * Setup the local clock events for a CPU. */ void __cpuinit twd_timer_setup(struct clock_event_device *clk) { + struct clock_event_device **this_cpu_clk; + + if (!twd_evt) { + int err; + + twd_evt = alloc_percpu(struct clock_event_device *); + if (!twd_evt) { + pr_err("twd: can't allocate memory\n"); + return; + } + + err = request_percpu_irq(clk->irq, twd_handler, + "twd", twd_evt); + if (err) { + pr_err("twd: can't register interrupt %d (%d)\n", + clk->irq, err); + return; + } + } + twd_calibrate_rate(); clk->name = "local_timer"; @@ -137,8 +178,10 @@ void __cpuinit twd_timer_setup(struct clock_event_device *clk) clk->max_delta_ns = clockevent_delta2ns(0xffffffff, clk); clk->min_delta_ns = clockevent_delta2ns(0xf, clk); + this_cpu_clk = __this_cpu_ptr(twd_evt); + *this_cpu_clk = clk; + clockevents_register_device(clk); - /* Make sure our local interrupt controller has this enabled */ - gic_enable_ppi(clk->irq); + enable_percpu_irq(clk->irq, 0); } diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c new file mode 100644 index 00000000000..1040c00405d --- /dev/null +++ b/arch/arm/kernel/topology.c @@ -0,0 +1,148 @@ +/* + * arch/arm/kernel/topology.c + * + * Copyright (C) 2011 Linaro Limited. + * Written by: Vincent Guittot + * + * based on arch/sh/kernel/topology.c + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/cpu.h> +#include <linux/cpumask.h> +#include <linux/init.h> +#include <linux/percpu.h> +#include <linux/node.h> +#include <linux/nodemask.h> +#include <linux/sched.h> + +#include <asm/cputype.h> +#include <asm/topology.h> + +#define MPIDR_SMP_BITMASK (0x3 << 30) +#define MPIDR_SMP_VALUE (0x2 << 30) + +#define MPIDR_MT_BITMASK (0x1 << 24) + +/* + * These masks reflect the current use of the affinity levels. + * The affinity level can be up to 16 bits according to ARM ARM + */ + +#define MPIDR_LEVEL0_MASK 0x3 +#define MPIDR_LEVEL0_SHIFT 0 + +#define MPIDR_LEVEL1_MASK 0xF +#define MPIDR_LEVEL1_SHIFT 8 + +#define MPIDR_LEVEL2_MASK 0xFF +#define MPIDR_LEVEL2_SHIFT 16 + +struct cputopo_arm cpu_topology[NR_CPUS]; + +const struct cpumask *cpu_coregroup_mask(unsigned int cpu) +{ + return &cpu_topology[cpu].core_sibling; +} + +/* + * store_cpu_topology is called at boot when only one cpu is running + * and with the mutex cpu_hotplug.lock locked, when several cpus have booted, + * which prevents simultaneous write access to cpu_topology array + */ +void store_cpu_topology(unsigned int cpuid) +{ + struct cputopo_arm *cpuid_topo = &cpu_topology[cpuid]; + unsigned int mpidr; + unsigned int cpu; + + /* If the cpu topology has been already set, just return */ + if (cpuid_topo->core_id != -1) + return; + + mpidr = read_cpuid_mpidr(); + + /* create cpu topology mapping */ + if ((mpidr & MPIDR_SMP_BITMASK) == MPIDR_SMP_VALUE) { + /* + * This is a multiprocessor system + * multiprocessor format & multiprocessor mode field are set + */ + + if (mpidr & MPIDR_MT_BITMASK) { + /* core performance interdependency */ + cpuid_topo->thread_id = (mpidr >> MPIDR_LEVEL0_SHIFT) + & MPIDR_LEVEL0_MASK; + cpuid_topo->core_id = (mpidr >> MPIDR_LEVEL1_SHIFT) + & MPIDR_LEVEL1_MASK; + cpuid_topo->socket_id = (mpidr >> MPIDR_LEVEL2_SHIFT) + & MPIDR_LEVEL2_MASK; + } else { + /* largely independent cores */ + cpuid_topo->thread_id = -1; + cpuid_topo->core_id = (mpidr >> MPIDR_LEVEL0_SHIFT) + & MPIDR_LEVEL0_MASK; + cpuid_topo->socket_id = (mpidr >> MPIDR_LEVEL1_SHIFT) + & MPIDR_LEVEL1_MASK; + } + } else { + /* + * This is an uniprocessor system + * we are in multiprocessor format but uniprocessor system + * or in the old uniprocessor format + */ + cpuid_topo->thread_id = -1; + cpuid_topo->core_id = 0; + cpuid_topo->socket_id = -1; + } + + /* update core and thread sibling masks */ + for_each_possible_cpu(cpu) { + struct cputopo_arm *cpu_topo = &cpu_topology[cpu]; + + if (cpuid_topo->socket_id == cpu_topo->socket_id) { + cpumask_set_cpu(cpuid, &cpu_topo->core_sibling); + if (cpu != cpuid) + cpumask_set_cpu(cpu, + &cpuid_topo->core_sibling); + + if (cpuid_topo->core_id == cpu_topo->core_id) { + cpumask_set_cpu(cpuid, + &cpu_topo->thread_sibling); + if (cpu != cpuid) + cpumask_set_cpu(cpu, + &cpuid_topo->thread_sibling); + } + } + } + smp_wmb(); + + printk(KERN_INFO "CPU%u: thread %d, cpu %d, socket %d, mpidr %x\n", + cpuid, cpu_topology[cpuid].thread_id, + cpu_topology[cpuid].core_id, + cpu_topology[cpuid].socket_id, mpidr); +} + +/* + * init_cpu_topology is called at boot when only one cpu is running + * which prevent simultaneous write access to cpu_topology array + */ +void init_cpu_topology(void) +{ + unsigned int cpu; + + /* init core mask */ + for_each_possible_cpu(cpu) { + struct cputopo_arm *cpu_topo = &(cpu_topology[cpu]); + + cpu_topo->thread_id = -1; + cpu_topo->core_id = -1; + cpu_topo->socket_id = -1; + cpumask_clear(&cpu_topo->core_sibling); + cpumask_clear(&cpu_topo->thread_sibling); + } + smp_wmb(); +} diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index bc9f9da782c..210382555af 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -27,6 +27,7 @@ #include <linux/atomic.h> #include <asm/cacheflush.h> +#include <asm/exception.h> #include <asm/system.h> #include <asm/unistd.h> #include <asm/traps.h> diff --git a/arch/arm/mach-exynos4/include/mach/entry-macro.S b/arch/arm/mach-exynos4/include/mach/entry-macro.S index d7a1e281ce7..006a4f4c65c 100644 --- a/arch/arm/mach-exynos4/include/mach/entry-macro.S +++ b/arch/arm/mach-exynos4/include/mach/entry-macro.S @@ -55,7 +55,7 @@ bic \irqnr, \irqstat, #0x1c00 - cmp \irqnr, #29 + cmp \irqnr, #15 cmpcc \irqnr, \irqnr cmpne \irqnr, \tmp cmpcs \irqnr, \irqnr @@ -76,8 +76,3 @@ strcc \irqstat, [\base, #GIC_CPU_EOI] cmpcs \irqnr, \irqnr .endm - - /* As above, this assumes that irqstat and base are preserved.. */ - - .macro test_for_ltirq, irqnr, irqstat, base, tmp - .endm diff --git a/arch/arm/mach-exynos4/mct.c b/arch/arm/mach-exynos4/mct.c index 1ae059b7ad7..85a1bb79f11 100644 --- a/arch/arm/mach-exynos4/mct.c +++ b/arch/arm/mach-exynos4/mct.c @@ -380,9 +380,11 @@ static void exynos4_mct_tick_init(struct clock_event_device *evt) if (cpu == 0) { mct_tick0_event_irq.dev_id = &mct_tick[cpu]; + evt->irq = IRQ_MCT_L0; setup_irq(IRQ_MCT_L0, &mct_tick0_event_irq); } else { mct_tick1_event_irq.dev_id = &mct_tick[cpu]; + evt->irq = IRQ_MCT_L1; setup_irq(IRQ_MCT_L1, &mct_tick1_event_irq); irq_set_affinity(IRQ_MCT_L1, cpumask_of(1)); } @@ -394,9 +396,10 @@ void __cpuinit local_timer_setup(struct clock_event_device *evt) exynos4_mct_tick_init(evt); } -int local_timer_ack(void) +void local_timer_stop(struct clock_event_device *evt) { - return 0; + evt->set_mode(CLOCK_EVT_MODE_UNUSED, evt); + disable_irq(evt->irq); } #endif /* CONFIG_LOCAL_TIMERS */ diff --git a/arch/arm/mach-exynos4/platsmp.c b/arch/arm/mach-exynos4/platsmp.c index 7c2282c6ba8..a08c536923f 100644 --- a/arch/arm/mach-exynos4/platsmp.c +++ b/arch/arm/mach-exynos4/platsmp.c @@ -191,12 +191,10 @@ void __init smp_init_cpus(void) ncores = scu_base ? scu_get_core_count(scu_base) : 1; /* sanity check */ - if (ncores > NR_CPUS) { - printk(KERN_WARNING - "EXYNOS4: no. of cores (%d) greater than configured " - "maximum of %d - clipping\n", - ncores, NR_CPUS); - ncores = NR_CPUS; + if (ncores > nr_cpu_ids) { + pr_warn("SMP: %u cores greater than maximum (%u), clipping\n", + ncores, nr_cpu_ids); + ncores = nr_cpu_ids; } for (i = 0; i < ncores; i++) diff --git a/arch/arm/mach-msm/board-msm8x60.c b/arch/arm/mach-msm/board-msm8x60.c index 9221f54778b..106170fb184 100644 --- a/arch/arm/mach-msm/board-msm8x60.c +++ b/arch/arm/mach-msm/board-msm8x60.c @@ -53,8 +53,6 @@ static void __init msm8x60_map_io(void) static void __init msm8x60_init_irq(void) { - unsigned int i; - gic_init(0, GIC_PPI_START, MSM_QGIC_DIST_BASE, (void *)MSM_QGIC_CPU_BASE); @@ -66,15 +64,6 @@ static void __init msm8x60_init_irq(void) */ if (!machine_is_msm8x60_sim()) writel(0x0000FFFF, MSM_QGIC_DIST_BASE + GIC_DIST_ENABLE_SET); - - /* FIXME: Not installing AVS_SVICINT and AVS_SVICINTSWDONE yet - * as they are configured as level, which does not play nice with - * handle_percpu_irq. - */ - for (i = GIC_PPI_START; i < GIC_SPI_START; i++) { - if (i != AVS_SVICINT && i != AVS_SVICINTSWDONE) - irq_set_handler(i, handle_percpu_irq); - } } static void __init msm8x60_init(void) diff --git a/arch/arm/mach-msm/include/mach/entry-macro-qgic.S b/arch/arm/mach-msm/include/mach/entry-macro-qgic.S index 12467157afb..717076f3ca7 100644 --- a/arch/arm/mach-msm/include/mach/entry-macro-qgic.S +++ b/arch/arm/mach-msm/include/mach/entry-macro-qgic.S @@ -8,81 +8,10 @@ * warranty of any kind, whether express or implied. */ -#include <mach/hardware.h> -#include <asm/hardware/gic.h> +#include <asm/hardware/entry-macro-gic.S> .macro disable_fiq .endm - .macro get_irqnr_preamble, base, tmp - ldr \base, =gic_cpu_base_addr - ldr \base, [\base] - .endm - .macro arch_ret_to_user, tmp1, tmp2 .endm - - /* - * The interrupt numbering scheme is defined in the - * interrupt controller spec. To wit: - * - * Migrated the code from ARM MP port to be more consistent - * with interrupt processing , the following still holds true - * however, all interrupts are treated the same regardless of - * if they are local IPI or PPI - * - * Interrupts 0-15 are IPI - * 16-31 are PPI - * (16-18 are the timers) - * 32-1020 are global - * 1021-1022 are reserved - * 1023 is "spurious" (no interrupt) - * - * A simple read from the controller will tell us the number of the - * highest priority enabled interrupt. We then just need to check - * whether it is in the valid range for an IRQ (0-1020 inclusive). - * - * Base ARM code assumes that the local (private) peripheral interrupts - * are not valid, we treat them differently, in that the privates are - * handled like normal shared interrupts with the exception that only - * one processor can register the interrupt and the handler must be - * the same for all processors. - */ - - .macro get_irqnr_and_base, irqnr, irqstat, base, tmp - - ldr \irqstat, [\base, #GIC_CPU_INTACK] /* bits 12-10 =srcCPU, - 9-0 =int # */ - - bic \irqnr, \irqstat, #0x1c00 @mask src - cmp \irqnr, #15 - ldr \tmp, =1021 - cmpcc \irqnr, \irqnr - cmpne \irqnr, \tmp - cmpcs \irqnr, \irqnr - - .endm - - /* We assume that irqstat (the raw value of the IRQ acknowledge - * register) is preserved from the macro above. - * If there is an IPI, we immediately signal end of interrupt on the - * controller, since this requires the original irqstat value which - * we won't easily be able to recreate later. - */ - .macro test_for_ipi, irqnr, irqstat, base, tmp - bic \irqnr, \irqstat, #0x1c00 - cmp \irqnr, #16 - strcc \irqstat, [\base, #GIC_CPU_EOI] - cmpcs \irqnr, \irqnr - .endm - - /* As above, this assumes that irqstat and base are preserved.. */ - - .macro test_for_ltirq, irqnr, irqstat, base, tmp - bic \irqnr, \irqstat, #0x1c00 - mov \tmp, #0 - cmp \irqnr, #16 - moveq \tmp, #1 - streq \irqstat, [\base, #GIC_CPU_EOI] - cmp \tmp, #0 - .endm diff --git a/arch/arm/mach-msm/platsmp.c b/arch/arm/mach-msm/platsmp.c index 1a1af9e5625..72765952091 100644 --- a/arch/arm/mach-msm/platsmp.c +++ b/arch/arm/mach-msm/platsmp.c @@ -156,6 +156,12 @@ void __init smp_init_cpus(void) { unsigned int i, ncores = get_core_count(); + if (ncores > nr_cpu_ids) { + pr_warn("SMP: %u cores greater than maximum (%u), clipping\n", + ncores, nr_cpu_ids); + ncores = nr_cpu_ids; + } + for (i = 0; i < ncores; i++) set_cpu_possible(i, true); diff --git a/arch/arm/mach-msm/timer.c b/arch/arm/mach-msm/timer.c index 63621f152c9..afeeca52fc6 100644 --- a/arch/arm/mach-msm/timer.c +++ b/arch/arm/mach-msm/timer.c @@ -71,12 +71,16 @@ enum timer_location { struct msm_clock { struct clock_event_device clockevent; struct clocksource clocksource; - struct irqaction irq; + unsigned int irq; void __iomem *regbase; uint32_t freq; uint32_t shift; void __iomem *global_counter; void __iomem *local_counter; + union { + struct clock_event_device *evt; + struct clock_event_device __percpu **percpu_evt; + }; }; enum { @@ -87,13 +91,10 @@ enum { static struct msm_clock msm_clocks[]; -static struct clock_event_device *local_clock_event; static irqreturn_t msm_timer_interrupt(int irq, void *dev_id) { - struct clock_event_device *evt = dev_id; - if (smp_processor_id() != 0) - evt = local_clock_event; + struct clock_event_device *evt = *(struct clock_event_device **)dev_id; if (evt->event_handler == NULL) return IRQ_HANDLED; evt->event_handler(evt); @@ -171,13 +172,7 @@ static struct msm_clock msm_clocks[] = { .mask = CLOCKSOURCE_MASK(32), .flags = CLOCK_SOURCE_IS_CONTINUOUS, }, - .irq = { - .name = "gp_timer", - .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_TRIGGER_RISING, - .handler = msm_timer_interrupt, - .dev_id = &msm_clocks[0].clockevent, - .irq = INT_GP_TIMER_EXP - }, + .irq = INT_GP_TIMER_EXP, .freq = GPT_HZ, }, [MSM_CLOCK_DGT] = { @@ -196,13 +191,7 @@ static struct msm_clock msm_clocks[] = { .mask = CLOCKSOURCE_MASK((32 - MSM_DGT_SHIFT)), .flags = CLOCK_SOURCE_IS_CONTINUOUS, }, - .irq = { - .name = "dg_timer", - .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_TRIGGER_RISING, - .handler = msm_timer_interrupt, - .dev_id = &msm_clocks[1].clockevent, - .irq = INT_DEBUG_TIMER_EXP - }, + .irq = INT_DEBUG_TIMER_EXP, .freq = DGT_HZ >> MSM_DGT_SHIFT, .shift = MSM_DGT_SHIFT, } @@ -261,10 +250,30 @@ static void __init msm_timer_init(void) printk(KERN_ERR "msm_timer_init: clocksource_register " "failed for %s\n", cs->name); - res = setup_irq(clock->irq.irq, &clock->irq); + ce->irq = clock->irq; + if (cpu_is_msm8x60() || cpu_is_msm8960()) { + clock->percpu_evt = alloc_percpu(struct clock_event_device *); + if (!clock->percpu_evt) { + pr_err("msm_timer_init: memory allocation " + "failed for %s\n", ce->name); + continue; + } + + *__this_cpu_ptr(clock->percpu_evt) = ce; + res = request_percpu_irq(ce->irq, msm_timer_interrupt, + ce->name, clock->percpu_evt); + if (!res) + enable_percpu_irq(ce->irq, 0); + } else { + clock->evt = ce; + res = request_irq(ce->irq, msm_timer_interrupt, + IRQF_TIMER | IRQF_NOBALANCING | IRQF_TRIGGER_RISING, + ce->name, &clock->evt); + } + if (res) - printk(KERN_ERR "msm_timer_init: setup_irq " - "failed for %s\n", cs->name); + pr_err("msm_timer_init: request_irq failed for %s\n", + ce->name); clockevents_register_device(ce); } @@ -273,6 +282,7 @@ static void __init msm_timer_init(void) #ifdef CONFIG_SMP int __cpuinit local_timer_setup(struct clock_event_device *evt) { + static bool local_timer_inited; struct msm_clock *clock = &msm_clocks[MSM_GLOBAL_TIMER]; /* Use existing clock_event for cpu 0 */ @@ -281,12 +291,13 @@ int __cpuinit local_timer_setup(struct clock_event_device *evt) writel(DGT_CLK_CTL_DIV_4, MSM_TMR_BASE + DGT_CLK_CTL); - if (!local_clock_event) { + if (!local_timer_inited) { writel(0, clock->regbase + TIMER_ENABLE); writel(0, clock->regbase + TIMER_CLEAR); writel(~0, clock->regbase + TIMER_MATCH_VAL); + local_timer_inited = true; } - evt->irq = clock->irq.irq; + evt->irq = clock->irq; evt->name = "local_timer"; evt->features = CLOCK_EVT_FEAT_ONESHOT; evt->rating = clock->clockevent.rating; @@ -298,17 +309,17 @@ int __cpuinit local_timer_setup(struct clock_event_device *evt) clockevent_delta2ns(0xf0000000 >> clock->shift, evt); evt->min_delta_ns = clockevent_delta2ns(4, evt); - local_clock_event = evt; - - gic_enable_ppi(clock->irq.irq); + *__this_cpu_ptr(clock->percpu_evt) = evt; + enable_percpu_irq(evt->irq, 0); clockevents_register_device(evt); return 0; } -inline int local_timer_ack(void) +void local_timer_stop(struct clock_event_device *evt) { - return 1; + evt->set_mode(CLOCK_EVT_MODE_UNUSED, evt); + disable_percpu_irq(evt->irq); } #endif diff --git a/arch/arm/mach-omap2/include/mach/entry-macro.S b/arch/arm/mach-omap2/include/mach/entry-macro.S index ceb8b7e593d..feb90a10945 100644 --- a/arch/arm/mach-omap2/include/mach/entry-macro.S +++ b/arch/arm/mach-omap2/include/mach/entry-macro.S @@ -78,7 +78,7 @@ 4401: ldr \irqstat, [\base, #GIC_CPU_INTACK] ldr \tmp, =1021 bic \irqnr, \irqstat, #0x1c00 - cmp \irqnr, #29 + cmp \irqnr, #15 cmpcc \irqnr, \irqnr cmpne \irqnr, \tmp cmpcs \irqnr, \irqnr @@ -101,18 +101,6 @@ it cs cmpcs \irqnr, \irqnr .endm - - /* As above, this assumes that irqstat and base are preserved */ - - .macro test_for_ltirq, irqnr, irqstat, base, tmp - bic \irqnr, \irqstat, #0x1c00 - mov \tmp, #0 - cmp \irqnr, #29 - itt eq - moveq \tmp, #1 - streq \irqstat, [\base, #GIC_CPU_EOI] - cmp \tmp, #0 - .endm #endif /* CONFIG_SMP */ #else /* MULTI_OMAP2 */ diff --git a/arch/arm/mach-omap2/omap-smp.c b/arch/arm/mach-omap2/omap-smp.c index ce65e9329c7..889464dc7b2 100644 --- a/arch/arm/mach-omap2/omap-smp.c +++ b/arch/arm/mach-omap2/omap-smp.c @@ -109,12 +109,10 @@ void __init smp_init_cpus(void) ncores = scu_get_core_count(scu_base); /* sanity check */ - if (ncores > NR_CPUS) { - printk(KERN_WARNING - "OMAP4: no. of cores (%d) greater than configured " - "maximum of %d - clipping\n", - ncores, NR_CPUS); - ncores = NR_CPUS; + if (ncores > nr_cpu_ids) { + pr_warn("SMP: %u cores greater than maximum (%u), clipping\n", + ncores, nr_cpu_ids); + ncores = nr_cpu_ids; } for (i = 0; i < ncores; i++) diff --git a/arch/arm/mach-pxa/irq.c b/arch/arm/mach-pxa/irq.c index b09e848eb6c..ca607571782 100644 --- a/arch/arm/mach-pxa/irq.c +++ b/arch/arm/mach-pxa/irq.c @@ -19,6 +19,8 @@ #include <linux/io.h> #include <linux/irq.h> +#include <asm/exception.h> + #include <mach/hardware.h> #include <mach/irqs.h> #include <mach/gpio.h> diff --git a/arch/arm/mach-realview/platsmp.c b/arch/arm/mach-realview/platsmp.c index 4ae943bafa9..e83c654a58d 100644 --- a/arch/arm/mach-realview/platsmp.c +++ b/arch/arm/mach-realview/platsmp.c @@ -52,12 +52,10 @@ void __init smp_init_cpus(void) ncores = scu_base ? scu_get_core_count(scu_base) : 1; /* sanity check */ - if (ncores > NR_CPUS) { - printk(KERN_WARNING - "Realview: no. of cores (%d) greater than configured " - "maximum of %d - clipping\n", - ncores, NR_CPUS); - ncores = NR_CPUS; + if (ncores > nr_cpu_ids) { + pr_warn("SMP: %u cores greater than maximum (%u), clipping\n", + ncores, nr_cpu_ids); + ncores = nr_cpu_ids; } for (i = 0; i < ncores; i++) diff --git a/arch/arm/mach-shmobile/entry-intc.S b/arch/arm/mach-shmobile/entry-intc.S index cac0a7ae208..1a1c00ca39a 100644 --- a/arch/arm/mach-shmobile/entry-intc.S +++ b/arch/arm/mach-shmobile/entry-intc.S @@ -51,7 +51,4 @@ .macro test_for_ipi, irqnr, irqstat, base, tmp .endm - .macro test_for_ltirq, irqnr, irqstat, base, tmp - .endm - arch_irq_handler shmobile_handle_irq_intc diff --git a/arch/arm/mach-shmobile/include/mach/entry-macro.S b/arch/arm/mach-shmobile/include/mach/entry-macro.S index d791f10eeac..8d4a416d428 100644 --- a/arch/arm/mach-shmobile/include/mach/entry-macro.S +++ b/arch/arm/mach-shmobile/include/mach/entry-macro.S @@ -27,8 +27,5 @@ .macro test_for_ipi, irqnr, irqstat, base, tmp .endm - .macro test_for_ltirq, irqnr, irqstat, base, tmp - .endm - .macro arch_ret_to_user, tmp1, tmp2 .endm diff --git a/arch/arm/mach-shmobile/platsmp.c b/arch/arm/mach-shmobile/platsmp.c index 66f980625a3..e4e485fa253 100644 --- a/arch/arm/mach-shmobile/platsmp.c +++ b/arch/arm/mach-shmobile/platsmp.c @@ -56,6 +56,12 @@ void __init smp_init_cpus(void) unsigned int ncores = shmobile_smp_get_core_count(); unsigned int i; + if (ncores > nr_cpu_ids) { + pr_warn("SMP: %u cores greater than maximum (%u), clipping\n", + ncores, nr_cpu_ids); + ncores = nr_cpu_ids; + } + for (i = 0; i < ncores; i++) set_cpu_possible(i, true); diff --git a/arch/arm/mach-tegra/platsmp.c b/arch/arm/mach-tegra/platsmp.c index 0886cbccdde..7d2b5d03c1d 100644 --- a/arch/arm/mach-tegra/platsmp.c +++ b/arch/arm/mach-tegra/platsmp.c @@ -114,10 +114,10 @@ void __init smp_init_cpus(void) { unsigned int i, ncores = scu_get_core_count(scu_base); - if (ncores > NR_CPUS) { - printk(KERN_ERR "Tegra: no. of cores (%u) greater than configured (%u), clipping\n", - ncores, NR_CPUS); - ncores = NR_CPUS; + if (ncores > nr_cpu_ids) { + pr_warn("SMP: %u cores greater than maximum (%u), clipping\n", + ncores, nr_cpu_ids); + ncores = nr_cpu_ids; } for (i = 0; i < ncores; i++) diff --git a/arch/arm/mach-ux500/platsmp.c b/arch/arm/mach-ux500/platsmp.c index a33df5f4c27..eb5199102cf 100644 --- a/arch/arm/mach-ux500/platsmp.c +++ b/arch/arm/mach-ux500/platsmp.c @@ -156,12 +156,10 @@ void __init smp_init_cpus(void) ncores = scu_base ? scu_get_core_count(scu_base) : 1; /* sanity check */ - if (ncores > NR_CPUS) { - printk(KERN_WARNING - "U8500: no. of cores (%d) greater than configured " - "maximum of %d - clipping\n", - ncores, NR_CPUS); - ncores = NR_CPUS; + if (ncores > nr_cpu_ids) { + pr_warn("SMP: %u cores greater than maximum (%u), clipping\n", + ncores, nr_cpu_ids); + ncores = nr_cpu_ids; } for (i = 0; i < ncores; i++) diff --git a/arch/arm/mach-vexpress/ct-ca9x4.c b/arch/arm/mach-vexpress/ct-ca9x4.c index bfd32f52c2d..2b1e836a76e 100644 --- a/arch/arm/mach-vexpress/ct-ca9x4.c +++ b/arch/arm/mach-vexpress/ct-ca9x4.c @@ -221,6 +221,12 @@ static void ct_ca9x4_init_cpu_map(void) { int i, ncores = scu_get_core_count(MMIO_P2V(A9_MPCORE_SCU)); + if (ncores > nr_cpu_ids) { + pr_warn("SMP: %u cores greater than maximum (%u), clipping\n", + ncores, nr_cpu_ids); + ncores = nr_cpu_ids; + } + for (i = 0; i < ncores; ++i) set_cpu_possible(i, true); diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c index 3b5ea68acbb..aa33949fef6 100644 --- a/arch/arm/mm/fault.c +++ b/arch/arm/mm/fault.c @@ -20,6 +20,7 @@ #include <linux/highmem.h> #include <linux/perf_event.h> +#include <asm/exception.h> #include <asm/system.h> #include <asm/pgtable.h> #include <asm/tlbflush.h> |