perf/x86/rapl: Use standard Energy Unit for SPR Dram RAPL domain

Intel Xeon servers used to use a fixed energy resolution (15.3uj) for
Dram RAPL domain. But on SPR, Dram RAPL domain follows the standard
energy resolution as described in MSR_RAPL_POWER_UNIT.

Remove the SPR Dram energy unit quirk.

Fixes: bcfd218b6679 ("perf/x86/rapl: Add support for Intel SPR platform")
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Tested-by: Wang Wendy <wendy.wang@intel.com>
Link: https://lkml.kernel.org/r/20220924054738.12076-3-rui.zhang@intel.com

diff --git a/arch/x86/events/rapl.c b/arch/x86/events/rapl.c
index fea544e..a829492 100644 (file)
--- a/arch/x86/events/rapl.c
+++ b/arch/x86/events/rapl.c
@@ -619,12 +619,8 @@ static int rapl_check_hw_unit(struct rapl_model *rm)
        case RAPL_UNIT_QUIRK_INTEL_HSW:
                rapl_hw_unit[PERF_RAPL_RAM] = 16;
                break;
-       /*
-        * SPR shares the same DRAM domain energy unit as HSW, plus it
-        * also has a fixed energy unit for Psys domain.
-        */
+       /* SPR uses a fixed energy unit for Psys domain. */
        case RAPL_UNIT_QUIRK_INTEL_SPR:
-               rapl_hw_unit[PERF_RAPL_RAM] = 16;
                rapl_hw_unit[PERF_RAPL_PSYS] = 0;
                break;
        default: