linux-kernel - [PATCH] perf/marvell_cn10k: Add MPAM support for TAD PMU

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Message-ID: <20220523145738.2750368-1-tanmay@marvell.com>
Date:   Mon, 23 May 2022 20:27:38 +0530
From:   Tanmay Jagdale <tanmay@...vell.com>
To:     <will@...nel.org>, <mark.rutland@....com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <sgoutham@...vell.com>,
        <lcherian@...vell.com>, <bbhushan2@...vell.com>,
        <amitsinght@...vell.com>, Tanmay Jagdale <tanmay@...vell.com>
Subject: [PATCH] perf/marvell_cn10k: Add MPAM support for TAD PMU

The TAD PMU supports following counters that can be filtered by MPAM
partition id.
    - (0x1a) tad_alloc_dtg : Allocations to DTG.
    - (0x1b) tad_alloc_ltg : Allocations to LTG.
    - (0x1c) tad_alloc_any : Total allocations to DTG/LTG.
    - (0x1d) tad_hit_dtg   : DTG hits.
    - (0x1e) tad_hit_ltg   : LTG hits.
    - (0x1f) tad_hit_any   : Hit in LTG/DTG.
    - (0x20) tad_tag_rd    : Total tag reads.

Add a new 'partid' attribute of 16-bits to get the partition id
passed from perf tool. This value would be stored in config1 field
of perf_event_attr structure.

Example:
perf stat -e tad/tad_alloc_any,partid=0x12/ <program>

- Drop read of TAD_PRF since we don't have to preserve any
  bit fields and always write an updated value.
- Update register offsets of TAD_PRF and TAD_PFC.

Signed-off-by: Tanmay Jagdale <tanmay@...vell.com>
---
 drivers/perf/marvell_cn10k_tad_pmu.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/drivers/perf/marvell_cn10k_tad_pmu.c b/drivers/perf/marvell_cn10k_tad_pmu.c
index 282d3a071a67..f552e6bffcac 100644
--- a/drivers/perf/marvell_cn10k_tad_pmu.c
+++ b/drivers/perf/marvell_cn10k_tad_pmu.c
@@ -18,10 +18,12 @@
 #include <linux/perf_event.h>
 #include <linux/platform_device.h>
 
-#define TAD_PFC_OFFSET		0x0
+#define TAD_PFC_OFFSET		0x800
 #define TAD_PFC(counter)	(TAD_PFC_OFFSET | (counter << 3))
-#define TAD_PRF_OFFSET		0x100
+#define TAD_PRF_OFFSET		0x900
 #define TAD_PRF(counter)	(TAD_PRF_OFFSET | (counter << 3))
+#define TAD_PRF_MATCH_PARTID	(1 << 8)
+#define TAD_PRF_PARTID_NS	(1 << 10)
 #define TAD_PRF_CNTSEL_MASK	0xFF
 #define TAD_MAX_COUNTERS	8
 
@@ -86,23 +88,32 @@ static void tad_pmu_event_counter_start(struct perf_event *event, int flags)
 	struct hw_perf_event *hwc = &event->hw;
 	u32 event_idx = event->attr.config;
 	u32 counter_idx = hwc->idx;
+	u32 partid_filter = 0;
 	u64 reg_val;
+	u32 partid;
 	int i;
 
 	hwc->state = 0;
 
+	/* Extract the partid (if any) passed by user */
+	partid = event->attr.config1 & 0x3f;
+
 	/* Typically TAD_PFC() are zeroed to start counting */
 	for (i = 0; i < tad_pmu->region_cnt; i++)
 		writeq_relaxed(0, tad_pmu->regions[i].base +
 			       TAD_PFC(counter_idx));
 
+	/* Only some counters are filterable by MPAM */
+	if (partid && (event_idx > 0x19) && (event_idx < 0x21))
+		partid_filter = TAD_PRF_MATCH_PARTID | TAD_PRF_PARTID_NS |
+				(partid << 11);
+
 	/* TAD()_PFC() start counting on the write
 	 * which sets TAD()_PRF()[CNTSEL] != 0
 	 */
 	for (i = 0; i < tad_pmu->region_cnt; i++) {
-		reg_val = readq_relaxed(tad_pmu->regions[i].base +
-					TAD_PRF(counter_idx));
-		reg_val |= (event_idx & 0xFF);
+		reg_val = (event_idx & 0xFF);
+		reg_val |= partid_filter;
 		writeq_relaxed(reg_val,	tad_pmu->regions[i].base +
 			       TAD_PRF(counter_idx));
 	}
@@ -221,9 +232,11 @@ static const struct attribute_group tad_pmu_events_attr_group = {
 };
 
 PMU_FORMAT_ATTR(event, "config:0-7");
+PMU_FORMAT_ATTR(partid, "config1:0-15");
 
 static struct attribute *tad_pmu_format_attrs[] = {
 	&format_attr_event.attr,
+	&format_attr_partid.attr,
 	NULL
 };
 
-- 
2.34.1