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ARM: 7293/1: logical_cpu_map: decouple CPU mapping from SMP 

It turns out that the logical CPU mapping is useful even when !CONFIG_SMP
for manipulation of devices like interrupt and power controllers when
running a UP kernel on a CPU other than 0. This can happen when kexecing
a UP image from an SMP kernel.

In the future, multi-cluster systems running AMP configurations will
require something similar for mapping cluster IDs, so it makes sense to
decouple this logic in preparation for this support.

Acked-by: Yang Bai <hamo.by@gmail.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Reported-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Will Deacon 2012-01-20 12:01:12 +01:00 committed by Russell King
parent a092f2b153
commit eb50439b92
18 changed files with 35 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/arm/common/gic.c
View File

@ -41,6 +41,7 @@
#include <asm/irq.h>
#include <asm/exception.h>
#include <asm/smp_plat.h>
#include <asm/mach/irq.h>
#include <asm/hardware/gic.h>
@ -352,11 +353,7 @@ static void __init gic_dist_init(struct gic_chip_data *gic)
unsigned int gic_irqs = gic->gic_irqs;
struct irq_domain *domain = &gic->domain;
void __iomem *base = gic_data_dist_base(gic);
u32 cpu = 0;
#ifdef CONFIG_SMP
cpu = cpu_logical_map(smp_processor_id());
#endif
u32 cpu = cpu_logical_map(smp_processor_id());
cpumask = 1 << cpu;
cpumask |= cpumask << 8;

6
arch/arm/include/asm/smp.h
View File

@ -70,12 +70,6 @@ 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.
*/

6
arch/arm/include/asm/smp_plat.h
View File

@ -43,4 +43,10 @@ static inline int cache_ops_need_broadcast(void)
}
#endif
/*
* Logical CPU mapping.
*/
extern int __cpu_logical_map[];
#define cpu_logical_map(cpu) __cpu_logical_map[cpu]
#endif

14
arch/arm/kernel/setup.c
View File

@ -426,6 +426,20 @@ void cpu_init(void)
: "r14");
}
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);
}
static void __init setup_processor(void)
{
struct proc_info_list *list;

14
arch/arm/kernel/smp.c
View File

@ -233,20 +233,6 @@ 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.

1
arch/arm/mach-exynos/hotplug.c
View File

@ -16,6 +16,7 @@
#include <linux/io.h>
#include <asm/cacheflush.h>
#include <asm/smp_plat.h>
#include <mach/regs-pmu.h>

1
arch/arm/mach-exynos/platsmp.c
View File

@ -23,6 +23,7 @@
#include <asm/cacheflush.h>
#include <asm/hardware/gic.h>
#include <asm/smp_plat.h>
#include <asm/smp_scu.h>
#include <mach/hardware.h>

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

@ -25,6 +25,7 @@
#include <linux/smp.h>
#include <asm/cacheflush.h>
#include <asm/smp_plat.h>
#include <asm/smp_scu.h>
#include <asm/hardware/arm_timer.h>
#include <asm/hardware/timer-sp.h>
@ -72,9 +73,7 @@ static void __init highbank_map_io(void)
void highbank_set_cpu_jump(int cpu, void *jump_addr)
{
#ifdef CONFIG_SMP
cpu = cpu_logical_map(cpu);
#endif
writel(virt_to_phys(jump_addr), HB_JUMP_TABLE_VIRT(cpu));
__cpuc_flush_dcache_area(HB_JUMP_TABLE_VIRT(cpu), 16);
outer_clean_range(HB_JUMP_TABLE_PHYS(cpu),

5
arch/arm/mach-imx/src.c
View File

@ -15,6 +15,7 @@
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/smp.h>
#include <asm/smp_plat.h>
#define SRC_SCR 0x000
#define SRC_GPR1 0x020
@ -24,10 +25,6 @@
static void __iomem *src_base;
#ifndef CONFIG_SMP
#define cpu_logical_map(cpu) 0
#endif
void imx_enable_cpu(int cpu, bool enable)
{
u32 mask, val;

1
arch/arm/mach-msm/hotplug.c
View File

@ -11,6 +11,7 @@
#include <linux/smp.h>
#include <asm/cacheflush.h>
#include <asm/smp_plat.h>
extern volatile int pen_release;

1
arch/arm/mach-msm/platsmp.c
View File

@ -20,6 +20,7 @@
#include <asm/cacheflush.h>
#include <asm/cputype.h>
#include <asm/mach-types.h>
#include <asm/smp_plat.h>
#include <mach/msm_iomap.h>

1
arch/arm/mach-realview/hotplug.c
View File

@ -13,6 +13,7 @@
#include <linux/smp.h>
#include <asm/cacheflush.h>
#include <asm/smp_plat.h>
extern volatile int pen_release;

1
arch/arm/mach-shmobile/smp-r8a7779.c
View File

@ -25,6 +25,7 @@
#include <linux/delay.h>
#include <mach/common.h>
#include <mach/r8a7779.h>
#include <asm/smp_plat.h>
#include <asm/smp_scu.h>
#include <asm/smp_twd.h>
#include <asm/hardware/gic.h>

1
arch/arm/mach-shmobile/smp-sh73a0.c
View File

@ -23,6 +23,7 @@
#include <linux/spinlock.h>
#include <linux/io.h>
#include <mach/common.h>
#include <asm/smp_plat.h>
#include <asm/smp_scu.h>
#include <asm/smp_twd.h>
#include <asm/hardware/gic.h>

1
arch/arm/mach-ux500/hotplug.c
View File

@ -13,6 +13,7 @@
#include <linux/smp.h>
#include <asm/cacheflush.h>
#include <asm/smp_plat.h>
extern volatile int pen_release;

1
arch/arm/mach-ux500/platsmp.c
View File

@ -19,6 +19,7 @@
#include <asm/cacheflush.h>
#include <asm/hardware/gic.h>
#include <asm/smp_plat.h>
#include <asm/smp_scu.h>
#include <mach/hardware.h>
#include <mach/setup.h>

1
arch/arm/mach-vexpress/hotplug.c
View File

@ -13,6 +13,7 @@
#include <linux/smp.h>
#include <asm/cacheflush.h>
#include <asm/smp_plat.h>
#include <asm/system.h>
extern volatile int pen_release;

1
arch/arm/plat-versatile/platsmp.c
View File

@ -16,6 +16,7 @@
#include <linux/smp.h>
#include <asm/cacheflush.h>
#include <asm/smp_plat.h>
#include <asm/hardware/gic.h>
/*