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Sun, 18 Jan 2026 22:41:11 -0800 (PST) Message-ID: Date: Mon, 19 Jan 2026 14:40:59 +0800 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 v3 09/47] arm64: mpam: Add cpu_pm notifier to restore MPAM sysregs To: Ben Horgan Cc: amitsinght@marvell.com, baisheng.gao@unisoc.com, baolin.wang@linux.alibaba.com, carl@os.amperecomputing.com, dave.martin@arm.com, david@kernel.org, dfustini@baylibre.com, fenghuay@nvidia.com, james.morse@arm.com, jonathan.cameron@huawei.com, kobak@nvidia.com, lcherian@marvell.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, peternewman@google.com, punit.agrawal@oss.qualcomm.com, quic_jiles@quicinc.com, reinette.chatre@intel.com, rohit.mathew@arm.com, scott@os.amperecomputing.com, sdonthineni@nvidia.com, tan.shaopeng@fujitsu.com, xhao@linux.alibaba.com, catalin.marinas@arm.com, will@kernel.org, corbet@lwn.net, maz@kernel.org, oupton@kernel.org, joey.gouly@arm.com, suzuki.poulose@arm.com, kvmarm@lists.linux.dev References: <20260112165914.4086692-1-ben.horgan@arm.com> <20260112165914.4086692-10-ben.horgan@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20260112165914.4086692-10-ben.horgan@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 1/13/26 12:58 AM, Ben Horgan wrote: > From: James Morse > > The MPAM system registers will be lost if the CPU is reset during PSCI's > CPU_SUSPEND. > > Add a PM notifier to restore them. > > mpam_thread_switch(current) can't be used as this won't make any changes if > the in-memory copy says the register already has the correct value. In > reality the system register is UNKNOWN out of reset. > > Reviewed-by: Jonathan Cameron > Signed-off-by: James Morse > Signed-off-by: Ben Horgan > --- > arch/arm64/kernel/mpam.c | 30 ++++++++++++++++++++++++++++++ > 1 file changed, 30 insertions(+) > Reviewed-by: Gavin Shan