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[175.34.8.244]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3a0715e9d5esm628384a91.17.2026.09.21.22.42.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 21 Sep 2026 22:42:07 -0700 (PDT) Message-ID: Date: Tue, 22 Sep 2026 15:42:03 +1000 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 02/12] arm_mpam: Restore the error interrupt enable from mpam_cpu_online() To: Ben Horgan Cc: james.morse@arm.com, reinette.chatre@intel.com, fenghuay@nvidia.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, dave.martin@arm.com, andre.przywara@arm.com References: <20260917145617.2202986-1-ben.horgan@arm.com> <20260917145617.2202986-3-ben.horgan@arm.com> From: Gavin Shan In-Reply-To: <20260917145617.2202986-3-ben.horgan@arm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: oZTI87ivClLajkH0GsKDZwy05JFCkwgrvjUjkc5UPqk_1790055728 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260921_224212_152550_925F5624 X-CRM114-Status: GOOD ( 13.42 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 9/18/26 12:56 AM, Ben Horgan wrote: > When all the associated CPUs to an MSC are offline, possibly caused by > PSCI_CPU_OFF, the power supply to the MSC can be cut off and all the > registers that are unknown out of reset, including MPAMF_ECR.INTEN, are > lost. Afterwards, we need to explicitly set MPAMF_ECR.INTEN when the first > associated CPU becomes online and the power supply to the MSC is recovered. > > Restore MPAMF_ECR.INTEN in mpam_cpu_online() when the first associated CPU > of the MSC becomes online. > > Fixes: 49aa621c4dca ("arm_mpam: Register and enable IRQs") > Signed-off-by: Ben Horgan > Tested-by: Gavin Shan > --- > Changes since v1: > Update the commit message (Gavin) > --- > drivers/resctrl/mpam_devices.c | 8 +++++++- > 1 file changed, 7 insertions(+), 1 deletion(-) > Reviewed-by: Gavin Shan