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>

diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c
index b2dc2dd..c47d619 100644 (file)
--- a/arch/arm/common/gic.c
+++ b/arch/arm/common/gic.c
@@ -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;

diff --git a/arch/arm/include/asm/smp.h b/arch/arm/include/asm/smp.h
index 1e5717a..ae29293 100644 (file)
--- a/arch/arm/include/asm/smp.h
+++ b/arch/arm/include/asm/smp.h
@@ -71,12 +71,6 @@ 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.
  */
 struct secondary_data {

diff --git a/arch/arm/include/asm/smp_plat.h b/arch/arm/include/asm/smp_plat.h
index f24c1b9..558d6c8 100644 (file)
--- a/arch/arm/include/asm/smp_plat.h
+++ b/arch/arm/include/asm/smp_plat.h
@@ -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

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index ab70c91..a255c39 100644 (file)
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -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;

diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 26cdc49..cdeb727 100644 (file)
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -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.

diff --git a/arch/arm/mach-exynos/hotplug.c b/arch/arm/mach-exynos/hotplug.c
index da70e7e..dd1ad55 100644 (file)
--- a/arch/arm/mach-exynos/hotplug.c
+++ b/arch/arm/mach-exynos/hotplug.c
@@ -16,6 +16,7 @@
 #include <linux/io.h>
 
 #include <asm/cacheflush.h>
+#include <asm/smp_plat.h>
 
 #include <mach/regs-pmu.h>
 

diff --git a/arch/arm/mach-exynos/platsmp.c b/arch/arm/mach-exynos/platsmp.c
index 683aec7..0f2035a 100644 (file)
--- a/arch/arm/mach-exynos/platsmp.c
+++ b/arch/arm/mach-exynos/platsmp.c
@@ -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>

diff --git a/arch/arm/mach-highbank/highbank.c b/arch/arm/mach-highbank/highbank.c
index 7afbe1e..8394d51 100644 (file)
--- a/arch/arm/mach-highbank/highbank.c
+++ b/arch/arm/mach-highbank/highbank.c
@@ -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),

diff --git a/arch/arm/mach-imx/src.c b/arch/arm/mach-imx/src.c
index 29bd124..e15f155 100644 (file)
--- a/arch/arm/mach-imx/src.c
+++ b/arch/arm/mach-imx/src.c
@@ -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;

diff --git a/arch/arm/mach-msm/hotplug.c b/arch/arm/mach-msm/hotplug.c
index 41c252d..a446fc1 100644 (file)
--- a/arch/arm/mach-msm/hotplug.c
+++ b/arch/arm/mach-msm/hotplug.c
@@ -11,6 +11,7 @@
 #include <linux/smp.h>
 
 #include <asm/cacheflush.h>
+#include <asm/smp_plat.h>
 
 extern volatile int pen_release;
 

diff --git a/arch/arm/mach-msm/platsmp.c b/arch/arm/mach-msm/platsmp.c
index 0b3e357..db0117e 100644 (file)
--- a/arch/arm/mach-msm/platsmp.c
+++ b/arch/arm/mach-msm/platsmp.c
@@ -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>
 

diff --git a/arch/arm/mach-realview/hotplug.c b/arch/arm/mach-realview/hotplug.c
index ac1aed2..eb55f05 100644 (file)
--- a/arch/arm/mach-realview/hotplug.c
+++ b/arch/arm/mach-realview/hotplug.c
@@ -13,6 +13,7 @@
 #include <linux/smp.h>
 
 #include <asm/cacheflush.h>
+#include <asm/smp_plat.h>
 
 extern volatile int pen_release;
 

diff --git a/arch/arm/mach-shmobile/smp-r8a7779.c b/arch/arm/mach-shmobile/smp-r8a7779.c
index cc97ef8..4fe2e9e 100644 (file)
--- a/arch/arm/mach-shmobile/smp-r8a7779.c
+++ b/arch/arm/mach-shmobile/smp-r8a7779.c
@@ -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>

diff --git a/arch/arm/mach-shmobile/smp-sh73a0.c b/arch/arm/mach-shmobile/smp-sh73a0.c
index be1ade7..0d159d6 100644 (file)
--- a/arch/arm/mach-shmobile/smp-sh73a0.c
+++ b/arch/arm/mach-shmobile/smp-sh73a0.c
@@ -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>

diff --git a/arch/arm/mach-ux500/hotplug.c b/arch/arm/mach-ux500/hotplug.c
index 572015e..c76f0f4 100644 (file)
--- a/arch/arm/mach-ux500/hotplug.c
+++ b/arch/arm/mach-ux500/hotplug.c
@@ -13,6 +13,7 @@
 #include <linux/smp.h>
 
 #include <asm/cacheflush.h>
+#include <asm/smp_plat.h>
 
 extern volatile int pen_release;
 

diff --git a/arch/arm/mach-ux500/platsmp.c b/arch/arm/mach-ux500/platsmp.c
index a19e398..d2058ef 100644 (file)
--- a/arch/arm/mach-ux500/platsmp.c
+++ b/arch/arm/mach-ux500/platsmp.c
@@ -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>

diff --git a/arch/arm/mach-vexpress/hotplug.c b/arch/arm/mach-vexpress/hotplug.c
index 813ee08..3034a4d 100644 (file)
--- a/arch/arm/mach-vexpress/hotplug.c
+++ b/arch/arm/mach-vexpress/hotplug.c
@@ -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;

diff --git a/arch/arm/plat-versatile/platsmp.c b/arch/arm/plat-versatile/platsmp.c
index 92f18d3..49c7db4 100644 (file)
--- a/arch/arm/plat-versatile/platsmp.c
+++ b/arch/arm/plat-versatile/platsmp.c
@@ -16,6 +16,7 @@
 #include <linux/smp.h>
 
 #include <asm/cacheflush.h>
+#include <asm/smp_plat.h>
 #include <asm/hardware/gic.h>
 
 /*