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Merge tag '3.10-rc2-psci-ops-11-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/sstabellini/xen into devel-stable

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Pull psci_smp_ops support from Stefano Stabellini:
It contains the generic PSCI patch and the smp_init patch that we
discussed so much about.  I think it would be helpful for other
people if you could create a stable branch with these patches so
that SoC devs can base their work on it.
This commit is contained in:
Russell King 2013-05-22 10:52:32 +01:00
commit 78ecad0183
9 changed files with 113 additions and 60 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/arm/include/asm/mach/arch.h
View File

@ -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 */

9
arch/arm/include/asm/psci.h
View File

@ -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 */

5
arch/arm/kernel/Makefile
View File

@ -88,6 +88,9 @@ 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

7
arch/arm/kernel/psci.c
View File

@ -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);

84
arch/arm/kernel/psci_smp.c Normal file
View File

@ -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,
};

7
arch/arm/kernel/setup.c
View File

@ -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>
@ -809,9 +810,15 @@ void __init setup_arch(char **cmdline_p)
unflatten_device_tree();
arm_dt_init_cpu_maps();
psci_init();
#ifdef CONFIG_SMP
if (is_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

1
arch/arm/mach-virt/Makefile
View File

@ -3,4 +3,3 @@
#
obj-y := virt.o
obj-$(CONFIG_SMP) += platsmp.o

50
arch/arm/mach-virt/platsmp.c
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@ -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,
};

3
arch/arm/mach-virt/virt.c
View File

@ -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