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Wed, 14 Jan 2026 08:58:02 -0800 (PST) X-Received: by 2002:a05:7300:cb10:b0:2ae:5020:afe1 with SMTP id 5a478bee46e88-2b486c94e69mr3996862eec.14.1768409882321; Wed, 14 Jan 2026 08:58:02 -0800 (PST) Received: from [192.168.68.59] ([76.93.176.75]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2b17078dd8fsm23272007eec.20.2026.01.14.08.58.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 14 Jan 2026 08:58:01 -0800 (PST) Message-ID: <6e674553-d0e5-449a-a49f-84f5d32cec94@oss.qualcomm.com> Date: Wed, 14 Jan 2026 08:58:01 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] firmware: smccc: default ARM_SMCCC_SOC_ID to disabled To: Will Deacon 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> Content-Language: en-US From: Satya Durga Srinivasu Prabhala In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: KXK2f0kIECqx7fIm6O1fsyKcNvczRHnv X-Authority-Analysis: v=2.4 cv=fbWgCkQF c=1 sm=1 tr=0 ts=6967cb1c 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=JZMqPXA25EcJQqw1oVMA:9 a=QEXdDO2ut3YA:10 a=6Ab_bkdmUrQuMsNx7PHu:22 X-Proofpoint-ORIG-GUID: KXK2f0kIECqx7fIm6O1fsyKcNvczRHnv X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTE0MDE0MiBTYWx0ZWRfX/itQ2wx3oqOn d1RtINKrh2BLbKNstbfzUHTvIKHh7zKpJlBKof/pETJfP4riylhlmv9wyKF8ZpZcQxuykOeB+Q0 TbCo4jqqMzEdBH6vvWWjEUyYdXj/60MNt25QjGHQn1GPvjO0B9A+jpm7dxKfPoafpgc0p3vS2Uf yFhM7otDxXgH7NtaV6sfZVdSl7F1XP3ixQgWg6Ktuymzu4R+ZnlXX5TNVvZ2aSkpKbiW8687vMm opMXzxH1UQiztfwCc8MdC58YnI3HZW4/pUxb3Z6hOllceGI2JPxF3gffxczOIDegTaeTHmLzwSq vgD7Ff0JAZKv6a1cxi7caQaf68slzO3SxISOVsLvM9xmCDUqP7adSfydkJoC3aYEHZNF+nwEzvL C/vkw2J+IRA0jxw/yXYtqTn8oE41ReLF2Iz42jovbglPtAmwg9CtL/t5CPuEQ2mj1DJhmL7iara nsMNediQWZwiik8cxzQ== 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 spamscore=0 suspectscore=0 impostorscore=0 phishscore=0 priorityscore=1501 adultscore=0 clxscore=1015 malwarescore=0 bulkscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2512120000 definitions=main-2601140142 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260114_085805_639905_6E785A2F X-CRM114-Status: GOOD ( 13.38 ) 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 Will, On 1/13/2026 2:57 AM, Will Deacon 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. > Isn't the fundamental issue here that you have multiple callers of > soc_device_register() and your userspace is only looking at soc0? Yes, that is right. The issue is we have several products which already uses the soc0 interface as vendor interface [1] existed even before the SMCCC SCM ID [2]. Also, per SMCCC specification, SOC ID is an optional feature. So, vendor specific implementation can take precedence over standard implementation or a way to disable SMCCC SOC ID could help. Best, Satya > > Will [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/soc/qcom/socinfo.c?id=efb448d0a3fca01bb987dd70963da6185b81751e [2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/firmware/smccc/soc_id.c?id=821b67fa46390baea0ac5139a60eaa48805261b2