linux-kernel - [PATCH mpam/v6.10-rc1 RFC 2/4] arm_mpam: Fix the range calculation of the implemented bits

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Message-ID: <20240722040140.515173-3-zengheng4@huawei.com>
Date: Mon, 22 Jul 2024 12:01:38 +0800
From: Zeng Heng <zengheng4@...wei.com>
To: <james.morse@....com>, <rohit.mathew@....com>, <amitsinght@...vell.com>,
	<sdonthineni@...dia.com>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<zengheng4@...wei.com>, <liwei391@...wei.com>
Subject: [PATCH mpam/v6.10-rc1 RFC 2/4] arm_mpam: Fix the range calculation of the implemented bits

The implemented bits of the MAX field in the MPAMCFG_{MBW_MAX, CMAX}
register are always to the left of the field, so the validated range
should be like [15, 15 - width + 1].

Fixes: 867471fefd5c ("SPLIT untested: arm_mpam: resctrl: Add support for MB resource")
Signed-off-by: Zeng Heng <zengheng4@...wei.com>
---
 drivers/platform/arm64/mpam/mpam_resctrl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/arm64/mpam/mpam_resctrl.c b/drivers/platform/arm64/mpam/mpam_resctrl.c
index a217f2e1f350..e87fca6fc5fd 100644
--- a/drivers/platform/arm64/mpam/mpam_resctrl.c
+++ b/drivers/platform/arm64/mpam/mpam_resctrl.c
@@ -585,7 +585,7 @@ static u16 percent_to_mbw_max(u8 pc, struct mpam_props *cprops)
 			break;
 	}
 
-	value &= GENMASK(15, 15 - cprops->bwa_wd);
+	value &= GENMASK(15, 15 - cprops->bwa_wd + 1);
 
 	return value;
 }
-- 
2.25.1