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Mon, 29 Apr 2024 21:29:23 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEma/8noQWxcMSK7hzaRRVetUMUXvHfjFYfu5UCMsY0GiHyeLt76asSKvhJFyxiVUNt5H/EkA== X-Received: by 2002:a05:6808:1b21:b0:3c8:42f1:40b2 with SMTP id bx33-20020a0568081b2100b003c842f140b2mr14918939oib.9.1714451363109; Mon, 29 Apr 2024 21:29:23 -0700 (PDT) Received: from [192.168.68.50] ([43.252.112.88]) by smtp.gmail.com with ESMTPSA id b16-20020a63d810000000b005e438fe702dsm19772604pgh.65.2024.04.29.21.29.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 29 Apr 2024 21:29:22 -0700 (PDT) Message-ID: Date: Tue, 30 Apr 2024 14:29:11 +1000 Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 12/16] arm64: psci: Ignore DENIED CPUs Content-Language: en-US To: Jonathan Cameron , Thomas Gleixner , Peter Zijlstra , linux-pm@vger.kernel.org, loongarch@lists.linux.dev, linux-acpi@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, x86@kernel.org, Russell King , "Rafael J . Wysocki" , Miguel Luis , James Morse , Salil Mehta , Jean-Philippe Brucker , Catalin Marinas , Will Deacon , Marc Zyngier , Hanjun Guo Cc: Ingo Molnar , Borislav Petkov , Dave Hansen , linuxarm@huawei.com, justin.he@arm.com, jianyong.wu@arm.com, Lorenzo Pieralisi , Sudeep Holla References: <20240426135126.12802-1-Jonathan.Cameron@huawei.com> <20240426135126.12802-13-Jonathan.Cameron@huawei.com> From: Gavin Shan In-Reply-To: <20240426135126.12802-13-Jonathan.Cameron@huawei.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 4/26/24 23:51, Jonathan Cameron wrote: > From: Jean-Philippe Brucker > > When a CPU is marked as disabled, but online capable in the MADT, PSCI > applies some firmware policy to control when it can be brought online. > PSCI returns DENIED to a CPU_ON request if this is not currently > permitted. The OS can learn the current policy from the _STA enabled bit. > > Handle the PSCI DENIED return code gracefully instead of printing an > error. > > Note the alternatives to the PSCI cpu_boot() callback do not > return -EPERM so the change in smp.c has no affect. > > See https://developer.arm.com/documentation/den0022/f/?lang=en page 58. > > Signed-off-by: Jean-Philippe Brucker > [ morse: Rewrote commit message ] > Signed-off-by: James Morse > Tested-by: Miguel Luis > Tested-by: Vishnu Pajjuri > Tested-by: Jianyong Wu > Reviewed-by: Jonathan Cameron > Signed-off-by: Russell King (Oracle) > Signed-off-by: Jonathan Cameron > --- > v8: Note in commit message that the -EPERM guard on the error print > only affects PSCI as other options never use this error code. > Should they do so in future, that may well indicate that they > now support similar refusal to boot. > --- > arch/arm64/kernel/psci.c | 2 +- > arch/arm64/kernel/smp.c | 3 ++- > 2 files changed, 3 insertions(+), 2 deletions(-) > Thanks for the check and clarification that -EPERM is only sensible to PSCI. With the clarification: Reviewed-by: Gavin Shan Thanks, Gavin