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ARM: make it easier to check the CPU part number correctly

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Ensure that platform maintainers check the CPU part number in the right
manner: the CPU part number is meaningless without also checking the
CPU implement(e|o)r (choose your preferred spelling!)  Provide an
interface which returns both the implementer and part number together,
and update the definitions to include the implementer.

Mark the old function as being deprecated... indeed, using the old
function with the definitions will now always evaluate as false, so
people must update their un-merged code to the new function.  While
this could be avoided by adding new definitions, we'd also have to
create new names for them which would be awkward.

Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2014-06-24 19:43:15 +01:00
parent ee2593ef56
commit af040ffc9b
10 changed files with 66 additions and 63 deletions
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55
arch/arm/kernel/perf_event_cpu.c
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@@ -250,40 +250,39 @@ static struct platform_device_id cpu_pmu_plat_device_ids[] = {
static int probe_current_pmu(struct arm_pmu *pmu)
{
int cpu = get_cpu();
unsigned long implementor = read_cpuid_implementor();
unsigned long part_number = read_cpuid_part_number();
int ret = -ENODEV;
pr_info("probing PMU on CPU %d\n", cpu);
switch (read_cpuid_part()) {
/* ARM Ltd CPUs. */
if (implementor == ARM_CPU_IMP_ARM) {
switch (part_number) {
case ARM_CPU_PART_ARM1136:
case ARM_CPU_PART_ARM1156:
case ARM_CPU_PART_ARM1176:
ret = armv6pmu_init(pmu);
break;
case ARM_CPU_PART_ARM11MPCORE:
ret = armv6mpcore_pmu_init(pmu);
break;
case ARM_CPU_PART_CORTEX_A8:
ret = armv7_a8_pmu_init(pmu);
break;
case ARM_CPU_PART_CORTEX_A9:
ret = armv7_a9_pmu_init(pmu);
break;
}
/* Intel CPUs [xscale]. */
} else if (implementor == ARM_CPU_IMP_INTEL) {
switch (xscale_cpu_arch_version()) {
case ARM_CPU_XSCALE_ARCH_V1:
ret = xscale1pmu_init(pmu);
break;
case ARM_CPU_XSCALE_ARCH_V2:
ret = xscale2pmu_init(pmu);
break;
case ARM_CPU_PART_ARM1136:
case ARM_CPU_PART_ARM1156:
case ARM_CPU_PART_ARM1176:
ret = armv6pmu_init(pmu);
break;
case ARM_CPU_PART_ARM11MPCORE:
ret = armv6mpcore_pmu_init(pmu);
break;
case ARM_CPU_PART_CORTEX_A8:
ret = armv7_a8_pmu_init(pmu);
break;
case ARM_CPU_PART_CORTEX_A9:
ret = armv7_a9_pmu_init(pmu);
break;
default:
if (read_cpuid_implementor() == ARM_CPU_IMP_INTEL) {
switch (xscale_cpu_arch_version()) {
case ARM_CPU_XSCALE_ARCH_V1:
ret = xscale1pmu_init(pmu);
break;
case ARM_CPU_XSCALE_ARCH_V2:
ret = xscale2pmu_init(pmu);
break;
}
}
break;
}
put_cpu();