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perf_counter, x86: modify initialization of struct x86_pmu 

This patch adds an error handler and changes initialization of struct
x86_pmu. No functional changes. Needed for follow-on patches.

[ Impact: cleanup ]

Signed-off-by: Robert Richter <robert.richter@amd.com>
Cc: Paul Mackerras <paulus@samba.org>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1241002046-8832-14-git-send-email-robert.richter@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Robert Richter 2009-04-29 12:47:10 +02:00 committed by Ingo Molnar
parent 55de0f2e57
commit 72eae04d3a
1 changed files with 16 additions and 11 deletions
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27
arch/x86/kernel/cpu/perf_counter.c
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@ -913,7 +913,7 @@ static struct x86_pmu amd_pmu = {
.max_events = ARRAY_SIZE(amd_perfmon_event_map),
};
static struct x86_pmu *intel_pmu_init(void)
static int intel_pmu_init(void)
{
union cpuid10_edx edx;
union cpuid10_eax eax;
@ -921,7 +921,7 @@ static struct x86_pmu *intel_pmu_init(void)
unsigned int ebx;
if (!cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON))
return NULL;
return -ENODEV;
/*
* Check whether the Architectural PerfMon supports
@ -929,49 +929,54 @@ static struct x86_pmu *intel_pmu_init(void)
*/
cpuid(10, &eax.full, &ebx, &unused, &edx.full);
if (eax.split.mask_length <= ARCH_PERFMON_BRANCH_MISSES_RETIRED)
return NULL;
return -ENODEV;
intel_perfmon_version = eax.split.version_id;
if (intel_perfmon_version < 2)
return NULL;
return -ENODEV;
pr_info("Intel Performance Monitoring support detected.\n");
pr_info("... version: %d\n", intel_perfmon_version);
pr_info("... bit width: %d\n", eax.split.bit_width);
pr_info("... mask length: %d\n", eax.split.mask_length);
x86_pmu = &intel_pmu;
nr_counters_generic = eax.split.num_counters;
nr_counters_fixed = edx.split.num_counters_fixed;
counter_value_mask = (1ULL << eax.split.bit_width) - 1;
return &intel_pmu;
return 0;
}
static struct x86_pmu *amd_pmu_init(void)
static int amd_pmu_init(void)
{
x86_pmu = &amd_pmu;
nr_counters_generic = 4;
nr_counters_fixed = 0;
counter_value_mask = 0x0000FFFFFFFFFFFFULL;
counter_value_bits = 48;
pr_info("AMD Performance Monitoring support detected.\n");
return &amd_pmu;
return 0;
}
void __init init_hw_perf_counters(void)
{
int err;
switch (boot_cpu_data.x86_vendor) {
case X86_VENDOR_INTEL:
x86_pmu = intel_pmu_init();
err = intel_pmu_init();
break;
case X86_VENDOR_AMD:
x86_pmu = amd_pmu_init();
err = amd_pmu_init();
break;
default:
return;
}
if (!x86_pmu)
if (err != 0)
return;
pr_info("... num counters: %d\n", nr_counters_generic);