ARM: SMP: consolidate the common parts of smp_prepare_cpus()

There is a certain amount of smp_prepare_cpus() which doesn't belong
in the platform support code - that is, code which is invariant to the
SMP implementation.  Move this code into arch/arm/kernel/smp.c, and
add a platform_ prefix to the original function.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/include/asm/smp.h b/arch/arm/include/asm/smp.h
index f93d0a6370166a5e239ca9b8c7d9c3ba88afdc11..96ed521f240877cd20a7d44df4c24b1481aae4f6 100644 (file)
--- a/arch/arm/include/asm/smp.h
+++ b/arch/arm/include/asm/smp.h
@@ -45,10 +45,6 @@ asmlinkage void do_IPI(int ipinr, struct pt_regs *regs);
  */
 extern void smp_init_cpus(void);
 
-/*
- * Move global data into per-processor storage.
- */
-extern void smp_store_cpu_info(unsigned int cpuid);
 
 /*
  * Raise an IPI cross call on CPUs in callmap.
@@ -72,6 +68,11 @@ asmlinkage void secondary_start_kernel(void);
  */
 extern void platform_secondary_init(unsigned int cpu);
 
+/*
+ * Initialize cpu_possible map, and enable coherency
+ */
+extern void platform_smp_prepare_cpus(unsigned int);
+
 /*
  * Initial data for bringing up a secondary CPU.
  */

diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 64f2d198c7647bc455c55fe641f95269d7e9911f..c66f2d3f65d3e596fa74bc0f96e550665a638292 100644 (file)
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -281,6 +281,17 @@ void __ref cpu_die(void)
 }
 #endif /* CONFIG_HOTPLUG_CPU */
 
+/*
+ * Called by both boot and secondaries to move global data into
+ * per-processor storage.
+ */
+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;
+}
+
 /*
  * This is the secondary CPU boot entry.  We're using this CPUs
  * idle thread stack, but a set of temporary page tables.
@@ -339,17 +350,6 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
        cpu_idle();
 }
 
-/*
- * Called by both boot and secondaries to move global data into
- * per-processor storage.
- */
-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;
-}
-
 void __init smp_cpus_done(unsigned int max_cpus)
 {
        int cpu;
@@ -372,6 +372,33 @@ void __init smp_prepare_boot_cpu(void)
        per_cpu(cpu_data, cpu).idle = current;
 }
 
+void __init smp_prepare_cpus(unsigned int max_cpus)
+{
+       unsigned int ncores = num_possible_cpus();
+
+       smp_store_cpu_info(smp_processor_id());
+
+       /*
+        * are we trying to boot more cores than exist?
+        */
+       if (max_cpus > ncores)
+               max_cpus = ncores;
+
+       if (max_cpus > 1) {
+               /*
+                * Enable the local timer or broadcast device for the
+                * boot CPU, but only if we have more than one CPU.
+                */
+               percpu_timer_setup();
+
+               /*
+                * Initialise the SCU if there are more than one CPU
+                * and let them know where to start.
+                */
+               platform_smp_prepare_cpus(max_cpus);
+       }
+}
+
 void arch_send_call_function_ipi_mask(const struct cpumask *mask)
 {
        smp_cross_call(mask, IPI_CALL_FUNC);

diff --git a/arch/arm/mach-omap2/omap-smp.c b/arch/arm/mach-omap2/omap-smp.c
index 405a8fc533088103d64ab1d87e19eace98ebf6dc..3c3d6796c97c2feb097b0adb8082cfd5e1f788d5 100644 (file)
--- a/arch/arm/mach-omap2/omap-smp.c
+++ b/arch/arm/mach-omap2/omap-smp.c
@@ -21,7 +21,6 @@
 #include <linux/io.h>
 
 #include <asm/cacheflush.h>
-#include <asm/localtimer.h>
 #include <asm/smp_scu.h>
 #include <mach/hardware.h>
 #include <mach/omap4-common.h>
@@ -123,20 +122,10 @@ void __init smp_init_cpus(void)
                set_cpu_possible(i, true);
 }
 
-void __init smp_prepare_cpus(unsigned int max_cpus)
+void __init platform_smp_prepare_cpus(unsigned int max_cpus)
 {
-       unsigned int ncores = num_possible_cpus();
-       unsigned int cpu = smp_processor_id();
        int i;
 
-       smp_store_cpu_info(cpu);
-
-       /*
-        * are we trying to boot more cores than exist?
-        */
-       if (max_cpus > ncores)
-               max_cpus = ncores;
-
        /*
         * Initialise the present map, which describes the set of CPUs
         * actually populated at the present time.
@@ -144,18 +133,10 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
        for (i = 0; i < max_cpus; i++)
                set_cpu_present(i, true);
 
-       if (max_cpus > 1) {
-               /*
-                * Enable the local timer or broadcast device for the
-                * boot CPU, but only if we have more than one CPU.
-                */
-               percpu_timer_setup();
-
-               /*
-                * Initialise the SCU and wake up the secondary core using
-                * wakeup_secondary().
-                */
-               scu_enable(scu_base);
-               wakeup_secondary();
-       }
+       /*
+        * Initialise the SCU and wake up the secondary core using
+        * wakeup_secondary().
+        */
+       scu_enable(scu_base);
+       wakeup_secondary();
 }

diff --git a/arch/arm/mach-realview/platsmp.c b/arch/arm/mach-realview/platsmp.c
index ef3cc86f5140833f73d8aef674171aa725a2a613..380562cd6580d8aa9b4464ca1894c6217e261a6e 100644 (file)
--- a/arch/arm/mach-realview/platsmp.c
+++ b/arch/arm/mach-realview/platsmp.c
@@ -19,7 +19,6 @@
 #include <asm/cacheflush.h>
 #include <mach/hardware.h>
 #include <asm/mach-types.h>
-#include <asm/localtimer.h>
 #include <asm/unified.h>
 
 #include <mach/board-eb.h>
@@ -147,20 +146,10 @@ void __init smp_init_cpus(void)
                set_cpu_possible(i, true);
 }
 
-void __init smp_prepare_cpus(unsigned int max_cpus)
+void __init platform_smp_prepare_cpus(unsigned int max_cpus)
 {
-       unsigned int ncores = num_possible_cpus();
-       unsigned int cpu = smp_processor_id();
        int i;
 
-       smp_store_cpu_info(cpu);
-
-       /*
-        * are we trying to boot more cores than exist?
-        */
-       if (max_cpus > ncores)
-               max_cpus = ncores;
-
        /*
         * Initialise the present map, which describes the set of CPUs
         * actually populated at the present time.
@@ -168,22 +157,14 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
        for (i = 0; i < max_cpus; i++)
                set_cpu_present(i, true);
 
-       if (max_cpus > 1) {
-               /*
-                * Enable the local timer or broadcast device for the
-                * boot CPU, but only if we have more than one CPU.
-                */
-               percpu_timer_setup();
-
-               scu_enable(scu_base_addr());
-
-               /*
-                * Write the address of secondary startup into the
-                * system-wide flags register. The BootMonitor waits
-                * until it receives a soft interrupt, and then the
-                * secondary CPU branches to this address.
-                */
-               __raw_writel(BSYM(virt_to_phys(realview_secondary_startup)),
-                            __io_address(REALVIEW_SYS_FLAGSSET));
-       }
+       scu_enable(scu_base_addr());
+
+       /*
+        * Write the address of secondary startup into the
+        * system-wide flags register. The BootMonitor waits
+        * until it receives a soft interrupt, and then the
+        * secondary CPU branches to this address.
+        */
+       __raw_writel(BSYM(virt_to_phys(realview_secondary_startup)),
+                    __io_address(REALVIEW_SYS_FLAGSSET));
 }

diff --git a/arch/arm/mach-s5pv310/platsmp.c b/arch/arm/mach-s5pv310/platsmp.c
index 560ada83b0b14b38f2a0f906b815b2c102103d9f..51c44d4c98902c2f08283ab7a8bdf2c3c2075785 100644 (file)
--- a/arch/arm/mach-s5pv310/platsmp.c
+++ b/arch/arm/mach-s5pv310/platsmp.c
@@ -22,7 +22,6 @@
 #include <linux/io.h>
 
 #include <asm/cacheflush.h>
-#include <asm/localtimer.h>
 #include <asm/smp_scu.h>
 #include <asm/unified.h>
 
@@ -142,18 +141,10 @@ void __init smp_init_cpus(void)
                set_cpu_possible(i, true);
 }
 
-void __init smp_prepare_cpus(unsigned int max_cpus)
+void __init platform_smp_prepare_cpus(unsigned int max_cpus)
 {
-       unsigned int ncores = num_possible_cpus();
-       unsigned int cpu = smp_processor_id();
        int i;
 
-       smp_store_cpu_info(cpu);
-
-       /* are we trying to boot more cores than exist? */
-       if (max_cpus > ncores)
-               max_cpus = ncores;
-
        /*
         * Initialise the present map, which describes the set of CPUs
         * actually populated at the present time.
@@ -161,25 +152,13 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
        for (i = 0; i < max_cpus; i++)
                set_cpu_present(i, true);
 
+       scu_enable(scu_base_addr());
+
        /*
-        * Initialise the SCU if there are more than one CPU and let
-        * them know where to start.
+        * Write the address of secondary startup into the
+        * system-wide flags register. The boot monitor waits
+        * until it receives a soft interrupt, and then the
+        * secondary CPU branches to this address.
         */
-       if (max_cpus > 1) {
-               /*
-                * Enable the local timer or broadcast device for the
-                * boot CPU, but only if we have more than one CPU.
-                */
-               percpu_timer_setup();
-
-               scu_enable(scu_base_addr());
-
-               /*
-                * Write the address of secondary startup into the
-                * system-wide flags register. The boot monitor waits
-                * until it receives a soft interrupt, and then the
-                * secondary CPU branches to this address.
-                */
        __raw_writel(BSYM(virt_to_phys(s5pv310_secondary_startup)), S5P_VA_SYSRAM);
-       }
 }

diff --git a/arch/arm/mach-tegra/platsmp.c b/arch/arm/mach-tegra/platsmp.c
index 66d0634e7a962396b31fc0f0d8c83031b703eae2..b66a0c2d990d21df75c1411ce6a4dbe94a90d3ee 100644 (file)
--- a/arch/arm/mach-tegra/platsmp.c
+++ b/arch/arm/mach-tegra/platsmp.c
@@ -22,7 +22,6 @@
 #include <asm/cacheflush.h>
 #include <mach/hardware.h>
 #include <asm/mach-types.h>
-#include <asm/localtimer.h>
 #include <asm/smp_scu.h>
 
 #include <mach/iomap.h>
@@ -127,20 +126,10 @@ void __init smp_init_cpus(void)
                cpu_set(i, cpu_possible_map);
 }
 
-void __init smp_prepare_cpus(unsigned int max_cpus)
+void __init platform_smp_prepare_cpus(unsigned int max_cpus)
 {
-       unsigned int ncores = scu_get_core_count(scu_base);
-       unsigned int cpu = smp_processor_id();
        int i;
 
-       smp_store_cpu_info(cpu);
-
-       /*
-        * are we trying to boot more cores than exist?
-        */
-       if (max_cpus > ncores)
-               max_cpus = ncores;
-
        /*
         * Initialise the present map, which describes the set of CPUs
         * actually populated at the present time.
@@ -148,8 +137,5 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
        for (i = 0; i < max_cpus; i++)
                set_cpu_present(i, true);
 
-       if (max_cpus > 1) {
-               percpu_timer_setup();
-               scu_enable(scu_base);
-       }
+       scu_enable(scu_base);
 }

diff --git a/arch/arm/mach-ux500/platsmp.c b/arch/arm/mach-ux500/platsmp.c
index fd40fa175913c838d0a2f1770372f113dc64a160..458a288981cb50c15952491fdea969052021542e 100644 (file)
--- a/arch/arm/mach-ux500/platsmp.c
+++ b/arch/arm/mach-ux500/platsmp.c
@@ -18,7 +18,6 @@
 #include <linux/io.h>
 
 #include <asm/cacheflush.h>
-#include <asm/localtimer.h>
 #include <asm/smp_scu.h>
 #include <mach/hardware.h>
 
@@ -138,20 +137,10 @@ void __init smp_init_cpus(void)
                set_cpu_possible(i, true);
 }
 
-void __init smp_prepare_cpus(unsigned int max_cpus)
+void __init platform_smp_prepare_cpus(unsigned int max_cpus)
 {
-       unsigned int ncores = num_possible_cpus();
-       unsigned int cpu = smp_processor_id();
        int i;
 
-       smp_store_cpu_info(cpu);
-
-       /*
-        * are we trying to boot more cores than exist?
-        */
-       if (max_cpus > ncores)
-               max_cpus = ncores;
-
        /*
         * Initialise the present map, which describes the set of CPUs
         * actually populated at the present time.
@@ -159,13 +148,6 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
        for (i = 0; i < max_cpus; i++)
                set_cpu_present(i, true);
 
-       if (max_cpus > 1) {
-               /*
-                * Enable the local timer or broadcast device for the
-                * boot CPU, but only if we have more than one CPU.
-                */
-               percpu_timer_setup();
-               scu_enable(__io_address(UX500_SCU_BASE));
-               wakeup_secondary();
-       }
+       scu_enable(__io_address(UX500_SCU_BASE));
+       wakeup_secondary();
 }

diff --git a/arch/arm/mach-vexpress/platsmp.c b/arch/arm/mach-vexpress/platsmp.c
index b5a75868366836d43a8b79cd94a032b71f8c4010..a0341d14ff2aa07098be44f9ffda56072b45108f 100644 (file)
--- a/arch/arm/mach-vexpress/platsmp.c
+++ b/arch/arm/mach-vexpress/platsmp.c
@@ -17,7 +17,6 @@
 #include <linux/io.h>
 
 #include <asm/cacheflush.h>
-#include <asm/localtimer.h>
 #include <asm/smp_scu.h>
 #include <asm/unified.h>
 
@@ -136,20 +135,10 @@ void __init smp_init_cpus(void)
                set_cpu_possible(i, true);
 }
 
-void __init smp_prepare_cpus(unsigned int max_cpus)
+void __init platform_smp_prepare_cpus(unsigned int max_cpus)
 {
-       unsigned int ncores = num_possible_cpus();
-       unsigned int cpu = smp_processor_id();
        int i;
 
-       smp_store_cpu_info(cpu);
-
-       /*
-        * are we trying to boot more cores than exist?
-        */
-       if (max_cpus > ncores)
-               max_cpus = ncores;
-
        /*
         * Initialise the present map, which describes the set of CPUs
         * actually populated at the present time.
@@ -157,27 +146,15 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
        for (i = 0; i < max_cpus; i++)
                set_cpu_present(i, true);
 
+       scu_enable(scu_base_addr());
+
        /*
-        * Initialise the SCU if there are more than one CPU and let
-        * them know where to start.
+        * Write the address of secondary startup into the
+        * system-wide flags register. The boot monitor waits
+        * until it receives a soft interrupt, and then the
+        * secondary CPU branches to this address.
         */
-       if (max_cpus > 1) {
-               /*
-                * Enable the local timer or broadcast device for the
-                * boot CPU, but only if we have more than one CPU.
-                */
-               percpu_timer_setup();
-
-               scu_enable(scu_base_addr());
-
-               /*
-                * Write the address of secondary startup into the
-                * system-wide flags register. The boot monitor waits
-                * until it receives a soft interrupt, and then the
-                * secondary CPU branches to this address.
-                */
-               writel(~0, MMIO_P2V(V2M_SYS_FLAGSCLR));
-               writel(BSYM(virt_to_phys(vexpress_secondary_startup)),
-                       MMIO_P2V(V2M_SYS_FLAGSSET));
-       }
+       writel(~0, MMIO_P2V(V2M_SYS_FLAGSCLR));
+       writel(BSYM(virt_to_phys(vexpress_secondary_startup)),
+               MMIO_P2V(V2M_SYS_FLAGSSET));
 }