perf/x86/intel/rapl: Simplify quirk handling even more

Drop the quirk() function pointer in favor of a simple boolean which
says whether the quirk should be applied or not. Update comment while at
it.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Harish Chegondi <harish.chegondi@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: linux-tip-commits@vger.kernel.org
Link: http://lkml.kernel.org/r/20160308164041.GF16568@pd.tnic
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/events/intel/rapl.c b/arch/x86/events/intel/rapl.c
index 019e541fa988e473304828e021e4248e37bfcc11..b834a3f55a015b0cd2a45972a0e2bdde24c24dfa 100644 (file)
--- a/arch/x86/events/intel/rapl.c
+++ b/arch/x86/events/intel/rapl.c
@@ -592,18 +592,7 @@ static int rapl_cpu_notifier(struct notifier_block *self,
        return NOTIFY_OK;
 }
 
-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))
+static int rapl_check_hw_unit(bool apply_quirk)
 {
        u64 msr_rapl_power_unit_bits;
        int i;
@@ -614,9 +603,14 @@ static int rapl_check_hw_unit(void (*quirk)(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();
+       /*
+        * DRAM domain on HSW server and KNL has fixed energy unit which can be
+        * different than the unit from power unit MSR. See
+        * "Intel Xeon Processor E5-1600 and E5-2600 v3 Product Families, V2
+        * of 2. Datasheet, September 2014, Reference Number: 330784-001 "
+        */
+       if (apply_quirk)
+               rapl_hw_unit[RAPL_IDX_RAM_NRG_STAT] = 16;
 
        /*
         * Calculate the timer rate:
@@ -704,7 +698,7 @@ static const struct x86_cpu_id rapl_cpu_match[] __initconst = {
 
 static int __init rapl_pmu_init(void)
 {
-       void (*quirk)(void) = NULL;
+       bool apply_quirk = false;
        int ret;
 
        if (!x86_match_cpu(rapl_cpu_match))
@@ -717,7 +711,7 @@ static int __init rapl_pmu_init(void)
                rapl_pmu_events_group.attrs = rapl_events_cln_attr;
                break;
        case 63: /* Haswell-Server */
-               quirk = rapl_hsw_server_quirk;
+               apply_quirk = true;
                rapl_cntr_mask = RAPL_IDX_SRV;
                rapl_pmu_events_group.attrs = rapl_events_srv_attr;
                break;
@@ -733,7 +727,7 @@ static int __init rapl_pmu_init(void)
                rapl_pmu_events_group.attrs = rapl_events_srv_attr;
                break;
        case 87: /* Knights Landing */
-               quirk = rapl_hsw_server_quirk;
+               apply_quirk = true;
                rapl_cntr_mask = RAPL_IDX_KNL;
                rapl_pmu_events_group.attrs = rapl_events_knl_attr;
                break;
@@ -741,7 +735,7 @@ static int __init rapl_pmu_init(void)
                return -ENODEV;
        }
 
-       ret = rapl_check_hw_unit(quirk);
+       ret = rapl_check_hw_unit(apply_quirk);
        if (ret)
                return ret;