linux-kernel - Re: [PATCH v3 00/29] arm_mpam: Add basic mpam driver

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Message-ID: <df84f19d-ff8e-47fd-94ac-8ea5bb6a01f4@nvidia.com>
Date: Fri, 17 Oct 2025 18:01:28 -0700
From: Fenghua Yu <fenghuay@...dia.com>
To: James Morse <james.morse@....com>, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-acpi@...r.kernel.org
Cc: D Scott Phillips OS <scott@...amperecomputing.com>,
 carl@...amperecomputing.com, lcherian@...vell.com,
 bobo.shaobowang@...wei.com, tan.shaopeng@...itsu.com,
 baolin.wang@...ux.alibaba.com, Jamie Iles <quic_jiles@...cinc.com>,
 Xin Hao <xhao@...ux.alibaba.com>, peternewman@...gle.com,
 dfustini@...libre.com, amitsinght@...vell.com,
 David Hildenbrand <david@...hat.com>, Dave Martin <dave.martin@....com>,
 Koba Ko <kobak@...dia.com>, Shanker Donthineni <sdonthineni@...dia.com>,
 baisheng.gao@...soc.com, Jonathan Cameron <jonathan.cameron@...wei.com>,
 Rob Herring <robh@...nel.org>, Rohit Mathew <rohit.mathew@....com>,
 Rafael Wysocki <rafael@...nel.org>, Len Brown <lenb@...nel.org>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>, Hanjun Guo
 <guohanjun@...wei.com>, Sudeep Holla <sudeep.holla@....com>,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Danilo Krummrich <dakr@...nel.org>, Jeremy Linton <jeremy.linton@....com>,
 Gavin Shan <gshan@...hat.com>
Subject: Re: [PATCH v3 00/29] arm_mpam: Add basic mpam driver



On 10/17/25 11:56, James Morse wrote:
> Hello,
> 
> A slew of minor changes, nothing really sticks out.
> Changes are noted on each patch.
> 
> ~
> 
> This is just enough MPAM driver for ACPI. DT got ripped out. If you need DT
> support - please share your DTS so the DT folk know the binding is what is
> needed.

[SNIP]

> This series is based on v6.18-rc4, and can be retrieved from:
> https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git mpam/driver/v3
> 
> The rest of the driver can be found here:
> https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git mpam/snapshot/v6.18-rc1
> 
> What is MPAM? Set your time-machine to 2020:
> https://lore.kernel.org/lkml/20201030161120.227225-1-james.morse@arm.com/

In case you build/test the mpam/snapshot/v6.18-rc1 branch, need to apply 
the following patch. After applying this patch, this series and the rest
of the drivers run successfully on my machine.

diff --git a/drivers/resctrl/mpam_internal.h 
b/drivers/resctrl/mpam_internal.h
index f890d1381af6..132d29e53ae9 100644
--- a/drivers/resctrl/mpam_internal.h
+++ b/drivers/resctrl/mpam_internal.h
@@ -645,6 +645,11 @@ static inline void
mpam_resctrl_teardown_class(struct mpam_class *class) { }
   #define MPAMF_IIDR_VARIANT    GENMASK(19, 16)
   #define MPAMF_IIDR_PRODUCTID    GENMASK(31, 20)

+#define MPAMF_IIDR_IMPLEMENTER_SHIFT    0
+#define MPAMF_IIDR_REVISION_SHIFT    12
+#define MPAMF_IIDR_VARIANT_SHIFT    16
+#define MPAMF_IIDR_PRODUCTID_SHIFT    20
+
   /* MPAMF_AIDR - MPAM architecture ID register */
   #define MPAMF_AIDR_ARCH_MINOR_REV    GENMASK(3, 0)
   #define MPAMF_AIDR_ARCH_MAJOR_REV    GENMASK(7, 4)

[SNIP]

Thanks.

-Fenghua