linux-kernel - Re: [PATCH 13/33] arm_mpam: Add MPAM MSC register layout definitions

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Message-ID: <db4cdf45-4ba6-4b2e-a9a2-25c9bde81b71@arm.com>
Date: Wed, 10 Sep 2025 20:31:36 +0100
From: James Morse <james.morse@....com>
To: "Shaopeng Tan (Fujitsu)" <tan.shaopeng@...itsu.com>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "linux-arm-kernel@...ts.infradead.org"
 <linux-arm-kernel@...ts.infradead.org>,
 "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
 "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Cc: "shameerali.kolothum.thodi@...wei.com"
 <shameerali.kolothum.thodi@...wei.com>,
 D Scott Phillips OS <scott@...amperecomputing.com>,
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 Danilo Krummrich <dakr@...nel.org>
Subject: Re: [PATCH 13/33] arm_mpam: Add MPAM MSC register layout definitions

Hi Shaopeng,

On 09/09/2025 12:36, Shaopeng Tan (Fujitsu) wrote:
>> Memory Partitioning and Monitoring (MPAM) has memory mapped devices
>> (MSCs) with an identity/configuration page.
>>
>> Add the definitions for these registers as offset within the page(s).

>> diff --git a/drivers/resctrl/mpam_internal.h b/drivers/resctrl/mpam_internal.h
>> index d49bb884b433..6e0982a1a9ac 100644
>> --- a/drivers/resctrl/mpam_internal.h
>> +++ b/drivers/resctrl/mpam_internal.h
>> @@ -150,4 +150,270 @@ extern struct list_head mpam_classes;  int

>> +#define MSMON_CFG_MBWU_CTL_TYPE_MBWU
>> 	0x42
>> +#define MSMON_CFG_CSU_CTL_TYPE_CSU			0
> 
> +#define MSMON_CFG_CSU_CTL_TYPE_CSU			0x43?

Yes, that looks like the line got truncated.
This would have caused the counter type to be mismatched and reprogrammed each time.
Thanks for spotting it!

James