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[175.34.62.5]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29651c93e5dsm125460015ad.81.2025.11.09.14.16.03 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 09 Nov 2025 14:16:16 -0800 (PST) Message-ID: <3e551b14-fab7-49f9-8806-6d14a4229dd7@redhat.com> Date: Mon, 10 Nov 2025 08:16:01 +1000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 20/33] arm_mpam: Extend reset logic to allow devices to be reset any time To: Ben Horgan , james.morse@arm.com Cc: amitsinght@marvell.com, baisheng.gao@unisoc.com, baolin.wang@linux.alibaba.com, bobo.shaobowang@huawei.com, carl@os.amperecomputing.com, catalin.marinas@arm.com, dakr@kernel.org, dave.martin@arm.com, david@redhat.com, dfustini@baylibre.com, fenghuay@nvidia.com, gregkh@linuxfoundation.org, guohanjun@huawei.com, jeremy.linton@arm.com, jonathan.cameron@huawei.com, kobak@nvidia.com, lcherian@marvell.com, lenb@kernel.org, linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, lpieralisi@kernel.org, peternewman@google.com, quic_jiles@quicinc.com, rafael@kernel.org, robh@kernel.org, rohit.mathew@arm.com, scott@os.amperecomputing.com, sdonthineni@nvidia.com, sudeep.holla@arm.com, tan.shaopeng@fujitsu.com, will@kernel.org, xhao@linux.alibaba.com, Shaopeng Tan References: <20251107123450.664001-1-ben.horgan@arm.com> <20251107123450.664001-21-ben.horgan@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20251107123450.664001-21-ben.horgan@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 11/7/25 10:34 PM, Ben Horgan wrote: > From: James Morse > > cpuhp callbacks aren't the only time the MSC configuration may need to > be reset. Resctrl has an API call to reset a class. > If an MPAM error interrupt arrives it indicates the driver has > misprogrammed an MSC. The safest thing to do is reset all the MSCs > and disable MPAM. > > Add a helper to reset RIS via their class. Call this from mpam_disable(), > which can be scheduled from the error interrupt handler. > > Signed-off-by: James Morse > Reviewed-by: Jonathan Cameron > Reviewed-by: Ben Horgan > Tested-by: Fenghua Yu > Tested-by: Shaopeng Tan > Tested-by: Peter Newman > Signed-off-by: Ben Horgan > --- > drivers/resctrl/mpam_devices.c | 57 ++++++++++++++++++++++++++++++++-- > 1 file changed, 54 insertions(+), 3 deletions(-) > Reviewed-by: Gavin Shan