From: Kan Liang kan.liang@linux.intel.com
There are three channels on a Ice Lake server, but only two channels will ever be active. Current perf only enables two channels.
Support the extra IMC channel, which may be activated on some Ice Lake machines. For a non-activated channel, the SW can still access it. The write will be ignored by the HW. 0 is always returned for the reading.
Fixes: 2b3b76b5ec67 ("perf/x86/intel/uncore: Add Ice Lake server uncore support") Reviewed-by: Andi Kleen ak@linux.intel.com Signed-off-by: Kan Liang kan.liang@linux.intel.com Cc: stable@vger.kernel.org ---
The patch is a RESEND patch. The original post can be found at
https://lore.kernel.org/lkml/1625766302-18875-1-git-send-email-kan.liang@lin...
arch/x86/events/intel/uncore_snbep.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/antler/uncore_snbep.c index 9a178a9..72a4181 100644 --- a/arch/x86/events/intel/uncore_snbep.c +++ b/arch/x86/events/intel/uncore_snbep.c @@ -452,7 +452,7 @@ #define ICX_M3UPI_PCI_PMON_BOX_CTL 0xa0
/* ICX IMC */ -#define ICX_NUMBER_IMC_CHN 2 +#define ICX_NUMBER_IMC_CHN 3 #define ICX_IMC_MEM_STRIDE 0x4
/* SPR */ @@ -5458,7 +5458,7 @@ static struct intel_uncore_ops icx_uncore_mmio_ops = { static struct intel_uncore_type icx_uncore_imc = { .name = "imc", .num_counters = 4, - .num_boxes = 8, + .num_boxes = 12, .perf_ctr_bits = 48, .fixed_ctr_bits = 48, .fixed_ctr = SNR_IMC_MMIO_PMON_FIXED_CTR,