[PATCH v2] cpuidle/cpuidle-big_little: fix reading cpu id part number

From: Juri Lelli
Date: Thu Aug 14 2014 - 04:28:31 EST


Commit af040ffc9ba1 ("ARM: make it easier to check the CPU part number
correctly") changed ARM_CPU_PART_X masks, and the way they are returned and
checked against. Usage of read_cpuid_part_number() is now deprecated, and
calling places updated accordingly. This actually broke cpuidle-big_little
initialization, as bl_idle_driver_init() performs a check using an hardcoded
mask on cpu_id.

Create an interface to perform the check (that is now even easier to read).
Define also a proper mask (ARM_CPU_PART_MASK) that makes this kind of checks
cleaner and helps preventing bugs in the future. Update usage accordingly.

Signed-off-by: Juri Lelli <juri.lelli@xxxxxxx>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
Cc: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Chao Xie <chao.xie@xxxxxxxxxxx>
Cc: Stephen Warren <swarren@xxxxxxxxxx>
Cc: Sebastian Hesselbarth <sebastian.hesselbarth@xxxxxxxxx>
Cc: Rob Herring <rob.herring@xxxxxxxxxxx>
Cc: Jonathan Austin <Jonathan.Austin@xxxxxxx>
Cc: Chao Xie Linux <xiechao.mail@xxxxxxxxx>
Cc: Juri Lelli <juri.lelli@xxxxxxxxx>
Cc: linux-pm@xxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
arch/arm/include/asm/cputype.h | 3 ++-
arch/arm/include/asm/smp_plat.h | 15 +++++++++++++++
drivers/cpuidle/cpuidle-big_little.c | 13 +++----------
3 files changed, 20 insertions(+), 11 deletions(-)

diff --git a/arch/arm/include/asm/cputype.h b/arch/arm/include/asm/cputype.h
index 963a251..819777d 100644
--- a/arch/arm/include/asm/cputype.h
+++ b/arch/arm/include/asm/cputype.h
@@ -74,6 +74,7 @@
#define ARM_CPU_PART_CORTEX_A12 0x4100c0d0
#define ARM_CPU_PART_CORTEX_A17 0x4100c0e0
#define ARM_CPU_PART_CORTEX_A15 0x4100c0f0
+#define ARM_CPU_PART_MASK 0xff00fff0

#define ARM_CPU_XSCALE_ARCH_MASK 0xe000
#define ARM_CPU_XSCALE_ARCH_V1 0x2000
@@ -179,7 +180,7 @@ static inline unsigned int __attribute_const__ read_cpuid_implementor(void)
*/
static inline unsigned int __attribute_const__ read_cpuid_part(void)
{
- return read_cpuid_id() & 0xff00fff0;
+ return read_cpuid_id() & ARM_CPU_PART_MASK;
}

static inline unsigned int __attribute_const__ __deprecated read_cpuid_part_number(void)
diff --git a/arch/arm/include/asm/smp_plat.h b/arch/arm/include/asm/smp_plat.h
index a252c0b..0ad7d49 100644
--- a/arch/arm/include/asm/smp_plat.h
+++ b/arch/arm/include/asm/smp_plat.h
@@ -8,6 +8,7 @@
#include <linux/cpumask.h>
#include <linux/err.h>

+#include <asm/cpu.h>
#include <asm/cputype.h>

/*
@@ -25,6 +26,20 @@ static inline bool is_smp(void)
#endif
}

+/**
+ * smp_cpuid_part() - return part id for a given cpu
+ * @cpu: logical cpu id.
+ *
+ * Return: part id of logical cpu passed as argument.
+ */
+static inline unsigned int smp_cpuid_part(int cpu)
+{
+ struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpu);
+
+ return is_smp() ? cpu_info->cpuid & ARM_CPU_PART_MASK :
+ read_cpuid_part();
+}
+
/* all SMP configurations have the extended CPUID registers */
#ifndef CONFIG_MMU
#define tlb_ops_need_broadcast() 0
diff --git a/drivers/cpuidle/cpuidle-big_little.c b/drivers/cpuidle/cpuidle-big_little.c
index 344d79fa..ef94c3b 100644
--- a/drivers/cpuidle/cpuidle-big_little.c
+++ b/drivers/cpuidle/cpuidle-big_little.c
@@ -138,25 +138,18 @@ static int bl_enter_powerdown(struct cpuidle_device *dev,
return idx;
}

-static int __init bl_idle_driver_init(struct cpuidle_driver *drv, int cpu_id)
+static int __init bl_idle_driver_init(struct cpuidle_driver *drv, int part_id)
{
- struct cpuinfo_arm *cpu_info;
struct cpumask *cpumask;
- unsigned long cpuid;
int cpu;

cpumask = kzalloc(cpumask_size(), GFP_KERNEL);
if (!cpumask)
return -ENOMEM;

- for_each_possible_cpu(cpu) {
- cpu_info = &per_cpu(cpu_data, cpu);
- cpuid = is_smp() ? cpu_info->cpuid : read_cpuid_id();
-
- /* read cpu id part number */
- if ((cpuid & 0xFFF0) == cpu_id)
+ for_each_possible_cpu(cpu)
+ if (smp_cpuid_part(cpu) == part_id)
cpumask_set_cpu(cpu, cpumask);
- }

drv->cpumask = cpumask;

--
2.0.4


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