diff options
author | Jon Medhurst <tixy@linaro.org> | 2013-07-17 12:01:44 +0100 |
---|---|---|
committer | Jon Medhurst <tixy@linaro.org> | 2013-07-17 12:01:44 +0100 |
commit | fcd1e5ad6653a951c1b0e945197bcf79a51e1e65 (patch) | |
tree | 1f0430e9c56c12987e3e51c3dc81651676244b68 | |
parent | 6c75e2cc08dcdcd56137757eaa50074f7b77c000 (diff) | |
parent | e472e4373b92dbfa98fc5f9ec81cd32c924a8346 (diff) |
Merge branch 'tracking-armlt-mcpm' into lsk-3.10-vexpress
-rw-r--r-- | arch/arm/Kconfig | 7 | ||||
-rw-r--r-- | arch/arm/common/Makefile | 1 | ||||
-rw-r--r-- | arch/arm/include/asm/mach/arch.h | 5 | ||||
-rw-r--r-- | arch/arm/include/asm/psci.h | 9 | ||||
-rw-r--r-- | arch/arm/kernel/Makefile | 5 | ||||
-rw-r--r-- | arch/arm/kernel/psci.c | 7 | ||||
-rw-r--r-- | arch/arm/kernel/psci_smp.c | 84 | ||||
-rw-r--r-- | arch/arm/kernel/setup.c | 9 | ||||
-rw-r--r-- | arch/arm/mach-vexpress/core.h | 2 | ||||
-rw-r--r-- | arch/arm/mach-vexpress/platsmp.c | 20 | ||||
-rw-r--r-- | arch/arm/mach-vexpress/v2m.c | 1 | ||||
-rw-r--r-- | arch/arm/mach-virt/Makefile | 1 | ||||
-rw-r--r-- | arch/arm/mach-virt/platsmp.c | 50 | ||||
-rw-r--r-- | arch/arm/mach-virt/virt.c | 3 |
14 files changed, 144 insertions, 60 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 136f263ed47b..c24b364bb8cb 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1521,6 +1521,13 @@ config MCPM for (multi-)cluster based systems, such as big.LITTLE based systems. +config BIG_LITTLE + bool "big.LITTLE support (Experimental)" + depends on CPU_V7 && SMP + select MCPM + help + This option enables support for the big.LITTLE architecture. + choice prompt "Memory split" default VMSPLIT_3G diff --git a/arch/arm/common/Makefile b/arch/arm/common/Makefile index 48434cbe3e89..f27d6a7af57f 100644 --- a/arch/arm/common/Makefile +++ b/arch/arm/common/Makefile @@ -16,3 +16,4 @@ obj-$(CONFIG_ARM_TIMER_SP804) += timer-sp.o obj-$(CONFIG_MCPM) += mcpm_head.o mcpm_entry.o mcpm_platsmp.o vlock.o AFLAGS_mcpm_head.o := -march=armv7-a AFLAGS_vlock.o := -march=armv7-a +CFLAGS_REMOVE_mcpm_entry.o = -pg diff --git a/arch/arm/include/asm/mach/arch.h b/arch/arm/include/asm/mach/arch.h index 308ad7d6f98b..75bf07910b81 100644 --- a/arch/arm/include/asm/mach/arch.h +++ b/arch/arm/include/asm/mach/arch.h @@ -8,6 +8,8 @@ * published by the Free Software Foundation. */ +#include <linux/types.h> + #ifndef __ASSEMBLY__ struct tag; @@ -16,8 +18,10 @@ struct pt_regs; struct smp_operations; #ifdef CONFIG_SMP #define smp_ops(ops) (&(ops)) +#define smp_init_ops(ops) (&(ops)) #else #define smp_ops(ops) (struct smp_operations *)NULL +#define smp_init_ops(ops) (bool (*)(void))NULL #endif struct machine_desc { @@ -41,6 +45,7 @@ struct machine_desc { unsigned char reserve_lp2 :1; /* never has lp2 */ char restart_mode; /* default restart mode */ struct smp_operations *smp; /* SMP operations */ + bool (*smp_init)(void); void (*fixup)(struct tag *, char **, struct meminfo *); void (*reserve)(void);/* reserve mem blocks */ diff --git a/arch/arm/include/asm/psci.h b/arch/arm/include/asm/psci.h index ce0dbe7c1625..c4ae171850f8 100644 --- a/arch/arm/include/asm/psci.h +++ b/arch/arm/include/asm/psci.h @@ -32,5 +32,14 @@ struct psci_operations { }; extern struct psci_operations psci_ops; +extern struct smp_operations psci_smp_ops; + +#ifdef CONFIG_ARM_PSCI +void psci_init(void); +bool psci_smp_available(void); +#else +static inline void psci_init(void) { } +static inline bool psci_smp_available(void) { return false; } +#endif #endif /* __ASM_ARM_PSCI_H */ diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index 5f3338eacad2..dd9d90ab65d0 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -82,6 +82,9 @@ obj-$(CONFIG_DEBUG_LL) += debug.o obj-$(CONFIG_EARLY_PRINTK) += early_printk.o obj-$(CONFIG_ARM_VIRT_EXT) += hyp-stub.o -obj-$(CONFIG_ARM_PSCI) += psci.o +ifeq ($(CONFIG_ARM_PSCI),y) +obj-y += psci.o +obj-$(CONFIG_SMP) += psci_smp.o +endif extra-y := $(head-y) vmlinux.lds diff --git a/arch/arm/kernel/psci.c b/arch/arm/kernel/psci.c index 36531643cc2c..46931880093d 100644 --- a/arch/arm/kernel/psci.c +++ b/arch/arm/kernel/psci.c @@ -158,7 +158,7 @@ static const struct of_device_id psci_of_match[] __initconst = { {}, }; -static int __init psci_init(void) +void __init psci_init(void) { struct device_node *np; const char *method; @@ -166,7 +166,7 @@ static int __init psci_init(void) np = of_find_matching_node(NULL, psci_of_match); if (!np) - return 0; + return; pr_info("probing function IDs from device-tree\n"); @@ -206,6 +206,5 @@ static int __init psci_init(void) out_put_node: of_node_put(np); - return 0; + return; } -early_initcall(psci_init); diff --git a/arch/arm/kernel/psci_smp.c b/arch/arm/kernel/psci_smp.c new file mode 100644 index 000000000000..23a11424c568 --- /dev/null +++ b/arch/arm/kernel/psci_smp.c @@ -0,0 +1,84 @@ +/* + * 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. + * + * Copyright (C) 2012 ARM Limited + * + * Author: Will Deacon <will.deacon@arm.com> + */ + +#include <linux/init.h> +#include <linux/irqchip/arm-gic.h> +#include <linux/smp.h> +#include <linux/of.h> + +#include <asm/psci.h> +#include <asm/smp_plat.h> + +/* + * psci_smp assumes that the following is true about PSCI: + * + * cpu_suspend Suspend the execution on a CPU + * @state we don't currently describe affinity levels, so just pass 0. + * @entry_point the first instruction to be executed on return + * returns 0 success, < 0 on failure + * + * cpu_off Power down a CPU + * @state we don't currently describe affinity levels, so just pass 0. + * no return on successful call + * + * cpu_on Power up a CPU + * @cpuid cpuid of target CPU, as from MPIDR + * @entry_point the first instruction to be executed on return + * returns 0 success, < 0 on failure + * + * migrate Migrate the context to a different CPU + * @cpuid cpuid of target CPU, as from MPIDR + * returns 0 success, < 0 on failure + * + */ + +extern void secondary_startup(void); + +static int __cpuinit psci_boot_secondary(unsigned int cpu, + struct task_struct *idle) +{ + if (psci_ops.cpu_on) + return psci_ops.cpu_on(cpu_logical_map(cpu), + __pa(secondary_startup)); + return -ENODEV; +} + +#ifdef CONFIG_HOTPLUG_CPU +void __ref psci_cpu_die(unsigned int cpu) +{ + const struct psci_power_state ps = { + .type = PSCI_POWER_STATE_TYPE_POWER_DOWN, + }; + + if (psci_ops.cpu_off) + psci_ops.cpu_off(ps); + + /* We should never return */ + panic("psci: cpu %d failed to shutdown\n", cpu); +} +#else +#define psci_cpu_die NULL +#endif + +bool __init psci_smp_available(void) +{ + /* is cpu_on available at least? */ + return (psci_ops.cpu_on != NULL); +} + +struct smp_operations __initdata psci_smp_ops = { + .smp_boot_secondary = psci_boot_secondary, + .cpu_die = psci_cpu_die, +}; diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index b4b1d397592b..ad84971b807c 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -37,6 +37,7 @@ #include <asm/cputype.h> #include <asm/elf.h> #include <asm/procinfo.h> +#include <asm/psci.h> #include <asm/sections.h> #include <asm/setup.h> #include <asm/smp_plat.h> @@ -796,9 +797,15 @@ void __init setup_arch(char **cmdline_p) unflatten_device_tree(); arm_dt_init_cpu_maps(); + psci_init(); #ifdef CONFIG_SMP if (is_smp()) { - smp_set_ops(mdesc->smp); + if (!mdesc->smp_init || !mdesc->smp_init()) { + if (psci_smp_available()) + smp_set_ops(&psci_smp_ops); + else if (mdesc->smp) + smp_set_ops(mdesc->smp); + } smp_init_cpus(); } #endif diff --git a/arch/arm/mach-vexpress/core.h b/arch/arm/mach-vexpress/core.h index f134cd4a85f1..bde4374ab6d5 100644 --- a/arch/arm/mach-vexpress/core.h +++ b/arch/arm/mach-vexpress/core.h @@ -6,6 +6,8 @@ void vexpress_dt_smp_map_io(void); +bool vexpress_smp_init_ops(void); + extern struct smp_operations vexpress_smp_ops; extern void vexpress_cpu_die(unsigned int cpu); diff --git a/arch/arm/mach-vexpress/platsmp.c b/arch/arm/mach-vexpress/platsmp.c index dc1ace55d557..993c9ae5dc5e 100644 --- a/arch/arm/mach-vexpress/platsmp.c +++ b/arch/arm/mach-vexpress/platsmp.c @@ -12,9 +12,11 @@ #include <linux/errno.h> #include <linux/smp.h> #include <linux/io.h> +#include <linux/of.h> #include <linux/of_fdt.h> #include <linux/vexpress.h> +#include <asm/mcpm.h> #include <asm/smp_scu.h> #include <asm/mach/map.h> @@ -203,3 +205,21 @@ struct smp_operations __initdata vexpress_smp_ops = { .cpu_die = vexpress_cpu_die, #endif }; + +bool __init vexpress_smp_init_ops(void) +{ +#ifdef CONFIG_MCPM + /* + * The best way to detect a multi-cluster configuration at the moment + * is to look for the presence of a CCI in the system. + * Override the default vexpress_smp_ops if so. + */ + struct device_node *node; + node = of_find_compatible_node(NULL, NULL, "arm,cci-400"); + if (node && of_device_is_available(node)) { + mcpm_smp_set_ops(); + return true; + } +#endif + return false; +} diff --git a/arch/arm/mach-vexpress/v2m.c b/arch/arm/mach-vexpress/v2m.c index c227959e5e4d..057f99b62eaf 100644 --- a/arch/arm/mach-vexpress/v2m.c +++ b/arch/arm/mach-vexpress/v2m.c @@ -484,6 +484,7 @@ static const char * const v2m_dt_match[] __initconst = { DT_MACHINE_START(VEXPRESS_DT, "ARM-Versatile Express") .dt_compat = v2m_dt_match, .smp = smp_ops(vexpress_smp_ops), + .smp_init = smp_init_ops(vexpress_smp_init_ops), .map_io = v2m_dt_map_io, .init_early = v2m_dt_init_early, .init_irq = irqchip_init, diff --git a/arch/arm/mach-virt/Makefile b/arch/arm/mach-virt/Makefile index 042afc1f8c44..7ddbfa60227f 100644 --- a/arch/arm/mach-virt/Makefile +++ b/arch/arm/mach-virt/Makefile @@ -3,4 +3,3 @@ # obj-y := virt.o -obj-$(CONFIG_SMP) += platsmp.o diff --git a/arch/arm/mach-virt/platsmp.c b/arch/arm/mach-virt/platsmp.c deleted file mode 100644 index f4143f5bfa5b..000000000000 --- a/arch/arm/mach-virt/platsmp.c +++ /dev/null @@ -1,50 +0,0 @@ -/* - * Dummy Virtual Machine - does what it says on the tin. - * - * Copyright (C) 2012 ARM Ltd - * Author: Will Deacon <will.deacon@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/init.h> -#include <linux/smp.h> -#include <linux/of.h> - -#include <asm/psci.h> -#include <asm/smp_plat.h> - -extern void secondary_startup(void); - -static void __init virt_smp_init_cpus(void) -{ -} - -static void __init virt_smp_prepare_cpus(unsigned int max_cpus) -{ -} - -static int __cpuinit virt_boot_secondary(unsigned int cpu, - struct task_struct *idle) -{ - if (psci_ops.cpu_on) - return psci_ops.cpu_on(cpu_logical_map(cpu), - __pa(secondary_startup)); - return -ENODEV; -} - -struct smp_operations __initdata virt_smp_ops = { - .smp_init_cpus = virt_smp_init_cpus, - .smp_prepare_cpus = virt_smp_prepare_cpus, - .smp_boot_secondary = virt_boot_secondary, -}; diff --git a/arch/arm/mach-virt/virt.c b/arch/arm/mach-virt/virt.c index 061f283f579e..a67d2dd5bb60 100644 --- a/arch/arm/mach-virt/virt.c +++ b/arch/arm/mach-virt/virt.c @@ -36,11 +36,8 @@ static const char *virt_dt_match[] = { NULL }; -extern struct smp_operations virt_smp_ops; - DT_MACHINE_START(VIRT, "Dummy Virtual Machine") .init_irq = irqchip_init, .init_machine = virt_init, - .smp = smp_ops(virt_smp_ops), .dt_compat = virt_dt_match, MACHINE_END |