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Mon, 04 May 2026 02:20:25 -0700 (PDT) X-Received: by 2002:aa7:9f07:0:b0:835:388c:9764 with SMTP id d2e1a72fcca58-835388ca073mr4931557b3a.37.1777886424440; Mon, 04 May 2026 02:20:24 -0700 (PDT) Received: from [10.217.223.121] ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-83515ad0049sm12316337b3a.33.2026.05.04.02.20.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 04 May 2026 02:20:24 -0700 (PDT) Message-ID: <81d83991-df25-4fc4-8261-6793ea9dc438@oss.qualcomm.com> Date: Mon, 4 May 2026 14:50:10 +0530 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 v4 02/15] firmware: qcom: Add a generic PAS service To: Sumit Garg Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-media@vger.kernel.org, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, ath12k@lists.infradead.org, linux-remoteproc@vger.kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, robin.clark@oss.qualcomm.com, sean@poorly.run, akhilpo@oss.qualcomm.com, lumag@kernel.org, abhinav.kumar@linux.dev, jesszhan0024@gmail.com, marijn.suijten@somainline.org, airlied@gmail.com, simona@ffwll.ch, vikash.garodia@oss.qualcomm.com, dikshita.agarwal@oss.qualcomm.com, bod@kernel.org, mchehab@kernel.org, elder@kernel.org, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, jjohnson@kernel.org, mathieu.poirier@linaro.org, trilokkumar.soni@oss.qualcomm.com, mukesh.ojha@oss.qualcomm.com, pavan.kondeti@oss.qualcomm.com, jorge.ramirez@oss.qualcomm.com, tonyh@qti.qualcomm.com, vignesh.viswanathan@oss.qualcomm.com, srinivas.kandagatla@oss.qualcomm.com, amirreza.zarrabi@oss.qualcomm.com, op-tee@lists.trustedfirmware.org, apurupa@qti.qualcomm.com, skare@qti.qualcomm.com, linux-kernel@vger.kernel.org, Sumit Garg , Konrad Dybcio , Bjorn Andersson References: <20260427095603.1157963-1-sumit.garg@kernel.org> <20260427095603.1157963-3-sumit.garg@kernel.org> Content-Language: en-US From: Harshal Dev In-Reply-To: <20260427095603.1157963-3-sumit.garg@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: t8kf_EGrExLf-hrvVxdsTJ8-pLNbfFE4 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTA0MDA5OSBTYWx0ZWRfX/OH0Urv2C7Zr LF2yuEi6QD94aNsjKRQjlMfouz8eJsMeYf45+bn5AHx39n4t6vWm5vc7f9UMayk5dSP9dzsnSL3 xzLGzoulNtJJtnk9vLycBcEpKL+B5wL8GrTAkBJAU7PHZD/jQDF7ZF7EuDYqY6ijCgN+48LtLth +sZVGGEtDcWuT67lhhhRSIYYqB8f+Fl3vhw2ehH4myQkJ3ocIloKehL9OGBTl0TaY+OMuW/nvOf 8tZWUCMzHcyEucRJrbCYfS0kKDuzt+RlXpPHdq5wZcWo8BIDnhwRKVz5CRTTtCF5W0Ll5bexoox jUeuF29jqiPMkjF7QryPyP21KanN0dvLdc2apwtacp3M6Jq0Qv94kOkoP0o2tlDpcGMv0G+895O strPR29BjHOYba7NmAasCY3AICCL36TWepzpw3pYBBN7nem35KbIXcgDwZ3XN2Jymk7197LIAwa wrVYROzKz3YROQ/sIQA== X-Authority-Analysis: v=2.4 cv=dqLrzVg4 c=1 sm=1 tr=0 ts=69f864da cx=c_pps a=WW5sKcV1LcKqjgzy2JUPuA==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=NGcC8JguVDcA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=EUspDBNiAAAA:8 a=DWWpLck2SfFL7czMIZ0A:9 a=QEXdDO2ut3YA:10 a=OpyuDcXvxspvyRM73sMx:22 X-Proofpoint-ORIG-GUID: t8kf_EGrExLf-hrvVxdsTJ8-pLNbfFE4 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-04_03,2026-04-30_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 clxscore=1015 suspectscore=0 spamscore=0 lowpriorityscore=0 bulkscore=0 malwarescore=0 adultscore=0 impostorscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605040099 On 4/27/2026 3:25 PM, Sumit Garg via OP-TEE wrote: > From: Sumit Garg > > Qcom platforms has the legacy of using non-standard SCM calls > splintered over the various kernel drivers. These SCM calls aren't > compliant with the standard SMC calling conventions which is a > prerequisite to enable migration to the FF-A specifications from Arm. > > OP-TEE as an alternative trusted OS to Qualcomm TEE (QTEE) can't > support these non-standard SCM calls. And even for newer architectures > using S-EL2 with Hafnium support, QTEE won't be able to support SCM > calls either with FF-A requirements coming in. And with both OP-TEE > and QTEE drivers well integrated in the TEE subsystem, it makes further > sense to reuse the TEE bus client drivers infrastructure. > > The added benefit of TEE bus infrastructure is that there is support > for discoverable/enumerable services. With that client drivers don't > have to manually invoke a special SCM call to know the service status. > > So enable the generic Peripheral Authentication Service (PAS) provided > by the firmware. It acts as the common layer with different TZ > backends plugged in whether it's an SCM implementation or a proper > TEE bus based PAS service implementation. > > Signed-off-by: Sumit Garg > --- Reviewed-by: Harshal Dev Regards, Harshal