linux-kernel - [PATCH] perf/arm-cmn: Fix CMN_DTM_UNIT

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Message-Id: <20230912040309.1789-1-guojinhui.liam@bytedance.com>
Date:   Tue, 12 Sep 2023 12:03:09 +0800
From:   "guojinhui.liam" <guojinhui.liam@...edance.com>
To:     will@...nel.org, mark.rutland@....com
Cc:     lizefan.x@...edance.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        "guojinhui.liam" <guojinhui.liam@...edance.com>
Subject: [PATCH] perf/arm-cmn: Fix CMN_DTM_UNIT_INFO offset in CMN700

The por_dtm_unit_info's offest is 0x0960 in CMN700 according to
the CMN700 spec.

CMN700 spec link:
https://developer.arm.com/documentation/102308/0302/?lang=en
por_dtm_unit_info can be found in section [4.3.13.10 por_dtm_unit_info].

Signed-off-by: guojinhui.liam <guojinhui.liam@...edance.com>
---
 drivers/perf/arm-cmn.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c
index 913dc04b3a40..6f3fafee0ac9 100644
--- a/drivers/perf/arm-cmn.c
+++ b/drivers/perf/arm-cmn.c
@@ -113,6 +113,7 @@
 #define CMN_DTM_PMEVCNTSR		0x240
 
 #define CMN_DTM_UNIT_INFO		0x0910
+#define CMN700_DTM_UNIT_INFO		0x0960
 
 #define CMN_DTM_NUM_COUNTERS		4
 /* Want more local counters? Why not replicate the whole DTM! Ugh... */
@@ -2247,6 +2248,8 @@ static int arm_cmn_discover(struct arm_cmn *cmn, unsigned int rgn_offset)
 
 		if (cmn->part == PART_CMN600)
 			xp->dtc = 0xf;
+		else if (cmn->part == PART_CMN700)
+			xp->dtc = 1 << readl_relaxed(xp_region + CMN700_DTM_UNIT_INFO);
 		else
 			xp->dtc = 1 << readl_relaxed(xp_region + CMN_DTM_UNIT_INFO);
 
-- 
2.20.1