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 ---

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/intel/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,

Hi Peter,

Could you please pick up the fix? Please let me know if you have any comments/concerns.

Thanks, Kan

On 7/19/2021 8:54 AM, kan.liang@linux.intel.com wrote:

From: Kan Liang kan.liang@linux.intel.com

The uncore unit with the type ID 0 and the unit ID 0 is missed.

The table3 of the uncore unit maybe 0. The uncore_discovery_invalid_unit() mistakenly treated it as an invalid value.

Remove the !unit.table3 check.

Fixes: edae1f06c2cd ("perf/x86/intel/uncore: Parse uncore discovery tables") 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 was posted as a part of the "perf: Add Sapphire Rapids server uncore support" patch set. But it doesn't depend on the other patches in the patch set. The bugfix can be accepted and merged separately.

https://lore.kernel.org/lkml/cb0d2d43-102a-994c-f777-e11d61c77bf5@linux.inte...

arch/x86/events/intel/uncore_discovery.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/events/intel/uncore_discovery.h b/arch/x86/events/intel/uncore_discovery.h index 1d65293..abfb1e8 100644 --- a/arch/x86/events/intel/uncore_discovery.h +++ b/arch/x86/events/intel/uncore_discovery.h @@ -30,7 +30,7 @@ #define uncore_discovery_invalid_unit(unit) \

• (!unit.table1 || !unit.ctl || !unit.table3 || \

• (!unit.table1 || !unit.ctl || \ unit.table1 == -1ULL || unit.ctl == -1ULL || \ unit.table3 == -1ULL)