[patch V3 20/28] x86/perf/intel/rapl: Sanitize the quirk handling

From: Thomas Gleixner
Date: Mon Feb 22 2016 - 17:23:18 EST


There is no point in having a quirk machinery for a single possible
function. Get rid of it and move the quirk to a place where it makes actually
sense.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
arch/x86/kernel/cpu/perf_event_intel_rapl.c | 49 ++++++++++------------------
1 file changed, 19 insertions(+), 30 deletions(-)

Index: b/arch/x86/kernel/cpu/perf_event_intel_rapl.c
===================================================================
--- a/arch/x86/kernel/cpu/perf_event_intel_rapl.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_rapl.c
@@ -133,7 +133,6 @@ static int rapl_cntr_mask;
static DEFINE_PER_CPU(struct rapl_pmu *, rapl_pmu);
static DEFINE_PER_CPU(struct rapl_pmu *, rapl_pmu_to_free);

-static struct x86_pmu_quirk *rapl_quirks;
static inline u64 rapl_read_counter(struct perf_event *event)
{
u64 raw;
@@ -141,15 +140,6 @@ static inline u64 rapl_read_counter(stru
return raw;
}

-#define rapl_add_quirk(func_) \
-do { \
- static struct x86_pmu_quirk __quirk __initdata = { \
- .func = func_, \
- }; \
- __quirk.next = rapl_quirks; \
- rapl_quirks = &__quirk; \
-} while (0)
-
static inline u64 rapl_scale(u64 v, int cfg)
{
if (cfg > NR_RAPL_DOMAINS) {
@@ -564,17 +554,6 @@ static void rapl_cpu_init(int cpu)
cpumask_set_cpu(cpu, &rapl_cpu_mask);
}

-static __init void rapl_hsw_server_quirk(void)
-{
- /*
- * DRAM domain on HSW server has fixed energy unit which can be
- * different than the unit from power unit MSR.
- * "Intel Xeon Processor E5-1600 and E5-2600 v3 Product Families, V2
- * of 2. Datasheet, September 2014, Reference Number: 330784-001 "
- */
- rapl_hw_unit[RAPL_IDX_RAM_NRG_STAT] = 16;
-}
-
static int rapl_cpu_prepare(int cpu)
{
struct rapl_pmu *pmu = per_cpu(rapl_pmu, cpu);
@@ -672,7 +651,18 @@ static int rapl_cpu_notifier(struct noti
return NOTIFY_OK;
}

-static int rapl_check_hw_unit(void)
+static __init void rapl_hsw_server_quirk(void)
+{
+ /*
+ * DRAM domain on HSW server has fixed energy unit which can be
+ * different than the unit from power unit MSR.
+ * "Intel Xeon Processor E5-1600 and E5-2600 v3 Product Families, V2
+ * of 2. Datasheet, September 2014, Reference Number: 330784-001 "
+ */
+ rapl_hw_unit[RAPL_IDX_RAM_NRG_STAT] = 16;
+}
+
+static int rapl_check_hw_unit(void (*quirk)(void))
{
u64 msr_rapl_power_unit_bits;
int i;
@@ -683,6 +673,9 @@ static int rapl_check_hw_unit(void)
for (i = 0; i < NR_RAPL_DOMAINS; i++)
rapl_hw_unit[i] = (msr_rapl_power_unit_bits >> 8) & 0x1FULL;

+ /* Apply cpu model quirk */
+ if (quirk)
+ quirk();
return 0;
}

@@ -701,9 +694,9 @@ static const struct x86_cpu_id rapl_cpu_

static int __init rapl_pmu_init(void)
{
+ void (*quirk)(void) = NULL;
struct rapl_pmu *pmu;
int cpu, ret;
- struct x86_pmu_quirk *quirk;
int i;

/*
@@ -720,7 +713,7 @@ static int __init rapl_pmu_init(void)
rapl_pmu_events_group.attrs = rapl_events_cln_attr;
break;
case 63: /* Haswell-Server */
- rapl_add_quirk(rapl_hsw_server_quirk);
+ quirk = rapl_hsw_server_quirk;
rapl_cntr_mask = RAPL_IDX_SRV;
rapl_pmu_events_group.attrs = rapl_events_srv_attr;
break;
@@ -736,7 +729,7 @@ static int __init rapl_pmu_init(void)
rapl_pmu_events_group.attrs = rapl_events_srv_attr;
break;
case 87: /* Knights Landing */
- rapl_add_quirk(rapl_hsw_server_quirk);
+ quirk = rapl_hsw_server_quirk;
rapl_cntr_mask = RAPL_IDX_KNL;
rapl_pmu_events_group.attrs = rapl_events_knl_attr;
break;
@@ -745,14 +738,10 @@ static int __init rapl_pmu_init(void)
return -ENODEV;
}

- ret = rapl_check_hw_unit();
+ ret = rapl_check_hw_unit(quirk);
if (ret)
return ret;

- /* run cpu model quirks */
- for (quirk = rapl_quirks; quirk; quirk = quirk->next)
- quirk->func();
-
cpu_notifier_register_begin();

for_each_online_cpu(cpu) {