drivers/perf: hisi: Add TLP filter support

The PMU support to filter the TLP when counting the bandwidth with below
options:

- only count the TLP headers
- only count the TLP payloads
- count both TLP headers and payloads

In the current driver it's default to count the TLP payloads only, which
will have an implicity side effects that on the traffic only have header
only TLPs, we'll get no data.

Make this user configuration through "len_mode" parameter and make it
default to count both TLP headers and payloads when user not specified.
Also update the documentation for it.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Link: https://lore.kernel.org/r/20221117084136.53572-5-yangyicong@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/Documentation/admin-guide/perf/hisi-pcie-pmu.rst b/Documentation/admin-guide/perf/hisi-pcie-pmu.rst
index 645f08f..7e86366 100644 (file)
--- a/Documentation/admin-guide/perf/hisi-pcie-pmu.rst
+++ b/Documentation/admin-guide/perf/hisi-pcie-pmu.rst
@@ -110,3 +110,21 @@ Filter options
    Example usage of perf::
 
      $# perf stat -e hisi_pcie0_core0/rx_mrd_flux,thr_len=0x4,thr_mode=1/ sleep 5
+
+4. TLP Length filter
+
+   When counting bandwidth, the data can be composed of certain parts of TLP
+   packets. You can specify it through "len_mode":
+
+   - 2'b00: Reserved (Do not use this since the behaviour is undefined)
+   - 2'b01: Bandwidth of TLP payloads
+   - 2'b10: Bandwidth of TLP headers
+   - 2'b11: Bandwidth of both TLP payloads and headers
+
+   For example, "len_mode=2" means only counting the bandwidth of TLP headers
+   and "len_mode=3" means the final bandwidth data is composed of both TLP
+   headers and payloads. Default value if not specified is 2'b11.
+
+   Example usage of perf::
+
+     $# perf stat -e hisi_pcie0_core0/rx_mrd_flux,len_mode=0x1/ sleep 5

diff --git a/drivers/perf/hisilicon/hisi_pcie_pmu.c b/drivers/perf/hisilicon/hisi_pcie_pmu.c
index 071e63d..6fee0b6 100644 (file)
--- a/drivers/perf/hisilicon/hisi_pcie_pmu.c
+++ b/drivers/perf/hisilicon/hisi_pcie_pmu.c
@@ -47,10 +47,14 @@
 #define HISI_PCIE_EVENT_M              GENMASK_ULL(15, 0)
 #define HISI_PCIE_THR_MODE_M           GENMASK_ULL(27, 27)
 #define HISI_PCIE_THR_M                        GENMASK_ULL(31, 28)
+#define HISI_PCIE_LEN_M                        GENMASK_ULL(35, 34)
 #define HISI_PCIE_TARGET_M             GENMASK_ULL(52, 36)
 #define HISI_PCIE_TRIG_MODE_M          GENMASK_ULL(53, 53)
 #define HISI_PCIE_TRIG_M               GENMASK_ULL(59, 56)
 
+/* Default config of TLP length mode, will count both TLP headers and payloads */
+#define HISI_PCIE_LEN_M_DEFAULT                3ULL
+
 #define HISI_PCIE_MAX_COUNTERS         8
 #define HISI_PCIE_REG_STEP             8
 #define HISI_PCIE_THR_MAX_VAL          10
@@ -91,6 +95,7 @@ HISI_PCIE_PMU_FILTER_ATTR(thr_len, config1, 3, 0);
 HISI_PCIE_PMU_FILTER_ATTR(thr_mode, config1, 4, 4);
 HISI_PCIE_PMU_FILTER_ATTR(trig_len, config1, 8, 5);
 HISI_PCIE_PMU_FILTER_ATTR(trig_mode, config1, 9, 9);
+HISI_PCIE_PMU_FILTER_ATTR(len_mode, config1, 11, 10);
 HISI_PCIE_PMU_FILTER_ATTR(port, config2, 15, 0);
 HISI_PCIE_PMU_FILTER_ATTR(bdf, config2, 31, 16);
 
@@ -215,8 +220,8 @@ static void hisi_pcie_pmu_config_filter(struct perf_event *event)
 {
        struct hisi_pcie_pmu *pcie_pmu = to_pcie_pmu(event->pmu);
        struct hw_perf_event *hwc = &event->hw;
+       u64 port, trig_len, thr_len, len_mode;
        u64 reg = HISI_PCIE_INIT_SET;
-       u64 port, trig_len, thr_len;
 
        /* Config HISI_PCIE_EVENT_CTRL according to event. */
        reg |= FIELD_PREP(HISI_PCIE_EVENT_M, hisi_pcie_get_real_event(event));
@@ -245,6 +250,12 @@ static void hisi_pcie_pmu_config_filter(struct perf_event *event)
                reg |= HISI_PCIE_THR_EN;
        }
 
+       len_mode = hisi_pcie_get_len_mode(event);
+       if (len_mode)
+               reg |= FIELD_PREP(HISI_PCIE_LEN_M, len_mode);
+       else
+               reg |= FIELD_PREP(HISI_PCIE_LEN_M, HISI_PCIE_LEN_M_DEFAULT);
+
        hisi_pcie_pmu_writeq(pcie_pmu, HISI_PCIE_EVENT_CTRL, hwc->idx, reg);
 }
 
@@ -711,6 +722,7 @@ static struct attribute *hisi_pcie_pmu_format_attr[] = {
        HISI_PCIE_PMU_FORMAT_ATTR(thr_mode, "config1:4"),
        HISI_PCIE_PMU_FORMAT_ATTR(trig_len, "config1:5-8"),
        HISI_PCIE_PMU_FORMAT_ATTR(trig_mode, "config1:9"),
+       HISI_PCIE_PMU_FORMAT_ATTR(len_mode, "config1:10-11"),
        HISI_PCIE_PMU_FORMAT_ATTR(port, "config2:0-15"),
        HISI_PCIE_PMU_FORMAT_ATTR(bdf, "config2:16-31"),
        NULL