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Wed, 14 Jan 2026 10:04:23 -0800 (PST) X-Received: by 2002:a05:701b:220b:b0:119:e56b:98bf with SMTP id a92af1059eb24-12336a82526mr3365184c88.38.1768413862595; Wed, 14 Jan 2026 10:04:22 -0800 (PST) Received: from [192.168.68.59] ([76.93.176.75]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-121f243421esm31712742c88.2.2026.01.14.10.04.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 14 Jan 2026 10:04:22 -0800 (PST) Message-ID: <619f20eb-77e4-4250-ba5e-78db741ebbef@oss.qualcomm.com> Date: Wed, 14 Jan 2026 10:04:21 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] firmware: smccc: default ARM_SMCCC_SOC_ID to disabled To: Dmitry Baryshkov Cc: Mark Rutland , Lorenzo Pieralisi , Sudeep Holla , 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> <7ruiccdm7q5fg2pixmszr3fqvclvymdlkv4x4xbavkaeczrxgc@5l6usxqfi5fe> Content-Language: en-US From: Satya Durga Srinivasu Prabhala In-Reply-To: <7ruiccdm7q5fg2pixmszr3fqvclvymdlkv4x4xbavkaeczrxgc@5l6usxqfi5fe> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Authority-Analysis: v=2.4 cv=YPaSCBGx c=1 sm=1 tr=0 ts=6967daa8 cx=c_pps a=PfFC4Oe2JQzmKTvty2cRDw==:117 a=Q5rFrUx7DTp4enn/YD2GRQ==:17 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=-vY5I4PW3rQ7Gd5RY6YA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=6Ab_bkdmUrQuMsNx7PHu:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTE0MDE1MCBTYWx0ZWRfX9jnfDVMERBx1 1S4Yeoi0ekXwqxzydNQw+3sERNdOAQByMiQRdf/dKqPLrn5WV6sdcrPSnMWqN3RCnaOi3qNbwsE f9SKDrhynbMqc2WDnq61ziyEoy5yfXWSTQ1HO+5WBolfzLR3oLgVUExIIWZiUqW5Tlo3QdNYwDT pReiv06xW5DJZkA6TuxXm6msZxTRyNciKhzYMwKkbXSAmaB0oW+NHF+513GXvlQ7T82STUxfjIc RMJYf93wwC7t4odNpCcPPSigHPBusu+2UNaSsIPdbCoQJVnsm4kTGrtr6D62WlAji3033fz3rKS tMQehU/H/AsRf7M/Ulv5hBPJBHGJAhf3GdPwur/UyHoUMKCan9PC0qxrHjg/r4QxbZwtgR8mrVz E1m7BLb41bZIc9R/4hTgdDp576baf2k00NPqKRL8CZD1VgRtwz5oArvqpCDoEQA9v5oOUDsmhMb emz7bjPFgZPc1GRYO0A== X-Proofpoint-GUID: cE0aO5xZ-zBywmfMOhChMcYdhxHrDThC X-Proofpoint-ORIG-GUID: cE0aO5xZ-zBywmfMOhChMcYdhxHrDThC X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2026-01-14_05,2026-01-14_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 bulkscore=0 impostorscore=0 suspectscore=0 malwarescore=0 phishscore=0 lowpriorityscore=0 priorityscore=1501 spamscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2512120000 definitions=main-2601140150 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260114_100426_342358_820727CB X-CRM114-Status: GOOD ( 19.80 ) 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 Hello Dmitry, On 1/13/2026 3:25 AM, Dmitry Baryshkov wrote: > On Mon, Jan 12, 2026 at 10:24:06PM -0800, 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. > NAK, the userspace should not depend on the exact kernel configuration. > Consider working with distribution kernels, which would enable this > driver anyway. As I mentioned in the other replies, vendor interface exists before the standard interface and user space heavily relies on soc0 already. If not disabling the SMCCC SOC ID by default. I believe, we should  at-least have a way to make sure vendors can disable SMCCC SOC ID by some means or have vendor interface takes precedence. Best, Satya > >> 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(-) >>