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([2a01:e0a:3d9:2080:d283:7a7e:4c57:678d]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-434af6e09acsm360931f8f.35.2026.01.14.09.12.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 14 Jan 2026 09:12:30 -0800 (PST) Message-ID: Date: Wed, 14 Jan 2026 18:12:29 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Reply-To: Neil Armstrong Subject: Re: [PATCH] firmware: smccc: default ARM_SMCCC_SOC_ID to disabled To: Satya Durga Srinivasu Prabhala , Mark Rutland , Lorenzo Pieralisi , Sudeep Holla Cc: linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, trilok.soni@oss.qualcomm.com References: <20260112-disable_smccc_soc_id-v1-1-a5bee24befb4@oss.qualcomm.com> From: Neil Armstrong Content-Language: en-US, fr Autocrypt: addr=neil.armstrong@linaro.org; keydata= xsBNBE1ZBs8BCAD78xVLsXPwV/2qQx2FaO/7mhWL0Qodw8UcQJnkrWmgTFRobtTWxuRx8WWP GTjuhvbleoQ5Cxjr+v+1ARGCH46MxFP5DwauzPekwJUD5QKZlaw/bURTLmS2id5wWi3lqVH4 BVF2WzvGyyeV1o4RTCYDnZ9VLLylJ9bneEaIs/7cjCEbipGGFlfIML3sfqnIvMAxIMZrvcl9 qPV2k+KQ7q+aXavU5W+yLNn7QtXUB530Zlk/d2ETgzQ5FLYYnUDAaRl+8JUTjc0CNOTpCeik 80TZcE6f8M76Xa6yU8VcNko94Ck7iB4vj70q76P/J7kt98hklrr85/3NU3oti3nrIHmHABEB AAHNKk5laWwgQXJtc3Ryb25nIDxuZWlsLmFybXN0cm9uZ0BsaW5hcm8ub3JnPsLAkQQTAQoA OwIbIwULCQgHAwUVCgkICwUWAgMBAAIeAQIXgBYhBInsPQWERiF0UPIoSBaat7Gkz/iuBQJk Q5wSAhkBAAoJEBaat7Gkz/iuyhMIANiD94qDtUTJRfEW6GwXmtKWwl/mvqQtaTtZID2dos04 YqBbshiJbejgVJjy+HODcNUIKBB3PSLaln4ltdsV73SBcwUNdzebfKspAQunCM22Mn6FBIxQ GizsMLcP/0FX4en9NaKGfK6ZdKK6kN1GR9YffMJd2P08EO8mHowmSRe/ExAODhAs9W7XXExw UNCY4pVJyRPpEhv373vvff60bHxc1k/FF9WaPscMt7hlkbFLUs85kHtQAmr8pV5Hy9ezsSRa GzJmiVclkPc2BY592IGBXRDQ38urXeM4nfhhvqA50b/nAEXc6FzqgXqDkEIwR66/Gbp0t3+r yQzpKRyQif3OwE0ETVkGzwEIALyKDN/OGURaHBVzwjgYq+ZtifvekdrSNl8TIDH8g1xicBYp QTbPn6bbSZbdvfeQPNCcD4/EhXZuhQXMcoJsQQQnO4vwVULmPGgtGf8PVc7dxKOeta+qUh6+ SRh3vIcAUFHDT3f/Zdspz+e2E0hPV2hiSvICLk11qO6cyJE13zeNFoeY3ggrKY+IzbFomIZY 4yG6xI99NIPEVE9lNBXBKIlewIyVlkOaYvJWSV+p5gdJXOvScNN1epm5YHmf9aE2ZjnqZGoM Mtsyw18YoX9BqMFInxqYQQ3j/HpVgTSvmo5ea5qQDDUaCsaTf8UeDcwYOtgI8iL4oHcsGtUX oUk33HEAEQEAAcLAXwQYAQIACQUCTVkGzwIbDAAKCRAWmrexpM/4rrXiB/sGbkQ6itMrAIfn M7IbRuiSZS1unlySUVYu3SD6YBYnNi3G5EpbwfBNuT3H8//rVvtOFK4OD8cRYkxXRQmTvqa3 3eDIHu/zr1HMKErm+2SD6PO9umRef8V82o2oaCLvf4WeIssFjwB0b6a12opuRP7yo3E3gTCS KmbUuLv1CtxKQF+fUV1cVaTPMyT25Od+RC1K+iOR0F54oUJvJeq7fUzbn/KdlhA8XPGzwGRy 4zcsPWvwnXgfe5tk680fEKZVwOZKIEuJC3v+/yZpQzDvGYJvbyix0lHnrCzq43WefRHI5XTT QbM0WUIBIcGmq38+OgUsMYu4NzLu7uZFAcmp6h8g Organization: Linaro In-Reply-To: <20260112-disable_smccc_soc_id-v1-1-a5bee24befb4@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 1/13/26 07:24, Satya Durga Srinivasu Prabhala wrote: > The ARM SMCCC SoC ID driver is currently enabled by default and publishes > SMCCC-provided SoC identification into /sys/bus/soc/devices/socX/*. > > On platforms where a vendor SoC driver already exposes widely-consumed > attributes (e.g. Qualcomm socinfo [1]), enabling the SMCCC driver changes > the format of /sys/devices/soc0/soc_id (e.g. "jep106:XXYY:ZZZZ" instead > of a vendor logical ID like "519") and breaks existing userspace consumers. > > Flip the default of CONFIG_ARM_SMCCC_SOC_ID from y to n. Platforms that > prefer SMCCC over a vendor driver can explicitly enable it. > > This avoids unexpected format changes and keeps the generic SoC sysfs > stable on systems that rely on vendor-specific identification. > > [1] > Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/soc/qcom/socinfo.c > > Signed-off-by: Satya Durga Srinivasu Prabhala > --- > drivers/firmware/smccc/Kconfig | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/firmware/smccc/Kconfig b/drivers/firmware/smccc/Kconfig > index 15e7466179a6..f830d11ebdca 100644 > --- a/drivers/firmware/smccc/Kconfig > +++ b/drivers/firmware/smccc/Kconfig > @@ -18,8 +18,11 @@ config HAVE_ARM_SMCCC_DISCOVERY > config ARM_SMCCC_SOC_ID > bool "SoC bus device for the ARM SMCCC SOC_ID" > depends on HAVE_ARM_SMCCC_DISCOVERY > - default y > + default n > select SOC_BUS > help > Include support for the SoC bus on the ARM SMCCC firmware based > platforms providing some sysfs information about the SoC variant. > + Note: Several vendor platforms provide their own SoC information > + drivers under drivers/soc/*. To avoid conflicting sysfs attribute > + formats in /sys/devices/socX/*, this driver defaults to disabled. > > --- > base-commit: b71e635feefc852405b14620a7fc58c4c80c0f73 > change-id: 20260112-disable_smccc_soc_id-ed09ef4d777f > > Best regards, Disabling it by default impacts other platforms, the arm64 kernel is designed to be generic and run on any platform with defconfig and from the same build, please don't forget that. If you want to ship an arm64 kernel tailored for Qualcomm platforms, you're allowed, and you're also allowed to disable ARM_SMCCC_SOC_ID. The soc sysfs interface is designed to support multiple source of information, from vendor (like qcom socinfo) and smccc ID. And this is well documented, and pretty obvious... Neil