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    Subject[PATCH 5.14 137/849] perf/x86/intel/uncore: Support extra IMC channel on Ice Lake server
    Date
    From: Kan Liang <kan.liang@linux.intel.com>

    commit 496a18f09374ad89b3ab4366019bc3975db90234 upstream.

    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")
    Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
    Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
    Reviewed-by: Andi Kleen <ak@linux.intel.com>
    Cc: stable@vger.kernel.org
    Link: https://lkml.kernel.org/r/1629991963-102621-2-git-send-email-kan.liang@linux.intel.com
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    arch/x86/events/intel/uncore_snbep.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    --- a/arch/x86/events/intel/uncore_snbep.c
    +++ b/arch/x86/events/intel/uncore_snbep.c
    @@ -451,7 +451,7 @@
    #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

    DEFINE_UNCORE_FORMAT_ATTR(event, event, "config:0-7");
    @@ -5437,7 +5437,7 @@ static struct intel_uncore_ops icx_uncor
    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,

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