perf/x86/uncore: Correct the number of CHAs on SPR

commit 38776cc45eb7603df4735a0410f42cffff8e71a1 upstream.

The number of CHAs from the discovery table on some SPR variants is
incorrect, because of a firmware issue. An accurate number can be read
from the MSR UNC_CBO_CONFIG.

Fixes: 78044bd0e633 ("perf/x86/intel/uncore: Add Sapphire Rapids server CHA support")
Reported-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Stephane Eranian <eranian@google.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230508140206.283708-1-kan.liang@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index 8f371f3cbbd244b27f8be0e409ecde3f9ca74aae..935081ddf60bc2e341f5755f0eaadf96402cfac7 100644 (file)
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -5822,6 +5822,7 @@ static struct intel_uncore_type spr_uncore_mdf = {
 };
 
 #define UNCORE_SPR_NUM_UNCORE_TYPES            12
+#define UNCORE_SPR_CHA                         0
 #define UNCORE_SPR_IIO                         1
 #define UNCORE_SPR_IMC                         6
 
@@ -6064,12 +6065,22 @@ static int uncore_type_max_boxes(struct intel_uncore_type **types,
        return max + 1;
 }
 
+#define SPR_MSR_UNC_CBO_CONFIG         0x2FFE
+
 void spr_uncore_cpu_init(void)
 {
+       struct intel_uncore_type *type;
+       u64 num_cbo;
+
        uncore_msr_uncores = uncore_get_uncores(UNCORE_ACCESS_MSR,
                                                UNCORE_SPR_MSR_EXTRA_UNCORES,
                                                spr_msr_uncores);
 
+       type = uncore_find_type_by_id(uncore_msr_uncores, UNCORE_SPR_CHA);
+       if (type) {
+               rdmsrl(SPR_MSR_UNC_CBO_CONFIG, num_cbo);
+               type->num_boxes = num_cbo;
+       }
        spr_uncore_iio_free_running.num_boxes = uncore_type_max_boxes(uncore_msr_uncores, UNCORE_SPR_IIO);
 }