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[199.106.103.254]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2c0bbe04304sm9795623eec.23.2026.03.16.16.02.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 16 Mar 2026 16:02:33 -0700 (PDT) Message-ID: <3934e17f-a2fa-423f-898b-a0d89e69f564@oss.qualcomm.com> Date: Mon, 16 Mar 2026 16:02:31 -0700 Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 02/15] firmware: qcom: Add a generic PAS service To: Krzysztof Kozlowski , Sumit Garg , 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 Cc: andersson@kernel.org, konradybcio@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, 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, jens.wiklander@linaro.org, op-tee@lists.trustedfirmware.org, apurupa@qti.qualcomm.com, skare@qti.qualcomm.com, linux-kernel@vger.kernel.org, Sumit Garg References: <20260312062756.694390-1-sumit.garg@kernel.org> <20260312062756.694390-3-sumit.garg@kernel.org> <28d63822-f191-400a-8005-5185dd480dbb@kernel.org> Content-Language: en-US From: Trilok Soni In-Reply-To: <28d63822-f191-400a-8005-5185dd480dbb@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: krvJ8-SifupRl1hB2SUF8fEx6FyJCOnM X-Proofpoint-GUID: krvJ8-SifupRl1hB2SUF8fEx6FyJCOnM X-Authority-Analysis: v=2.4 cv=FvcIPmrq c=1 sm=1 tr=0 ts=69b88c0b cx=c_pps a=wEP8DlPgTf/vqF+yE6f9lg==:117 a=JYp8KDb2vCoCEuGobkYCKw==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=EUspDBNiAAAA:8 a=_eXaltnX1kRmSEBu75cA:9 a=QEXdDO2ut3YA:10 a=bBxd6f-gb0O0v-kibOvt:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzE2MDE5MSBTYWx0ZWRfX+VLuHbVSqgLa ujgN1Zh5sDN2QxNDrsk1C7SqvbYK/FiD3pnqP3MEF71QWomLI2mwLcRxYZfC45HbNyRQz3gqWPF zTVYWLHXxBUoKl+9l3CDWlPh6f2SmJDFDhi3VdLtj2wOUy3iUNM89aqHRdHh41DIPoU0P2iXHMv GMFOB2mkIDHiJQ1cz8gNzj2BTdTs85EhQEowQdx5t39m4900Vy2/aDciS6aYxkvw3MMR0rKsOCL 4OCu3e/vkFOstqC6D58TvZgWl5klJnkk8CNA6t0nsEFvGCLioB6B+V1vZmA+IlcW+H1OLnILp2B pwOH2WyOgcgIigvYmdMmI/1IW9/paOsaW/jxliySAZNtpdJKAHrU/Ui8Va3VvFN9MNpaEoo7ksD u8vGoPvRgqlwSbPGQYboZzH6t0e/AuPa1Lq27PcbVXT+Hszb/80/VdBmJ42j3eaZ1HELyJRh3ek 67nsVADRrALPicTArxw== 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=2026-03-16_06,2026-03-16_06,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 priorityscore=1501 suspectscore=0 phishscore=0 lowpriorityscore=0 bulkscore=0 spamscore=0 clxscore=1015 malwarescore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603160191 On 3/16/2026 12:51 AM, Krzysztof Kozlowski wrote: > On 12/03/2026 07:27, Sumit Garg 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 >> with S-EL2 and 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 >> --- >> drivers/firmware/qcom/Kconfig | 8 + >> drivers/firmware/qcom/Makefile | 1 + >> drivers/firmware/qcom/qcom_pas.c | 298 +++++++++++++++++++++++++ >> drivers/firmware/qcom/qcom_pas.h | 53 +++++ >> include/linux/firmware/qcom/qcom_pas.h | 41 ++++ >> 5 files changed, 401 insertions(+) >> create mode 100644 drivers/firmware/qcom/qcom_pas.c >> create mode 100644 drivers/firmware/qcom/qcom_pas.h >> create mode 100644 include/linux/firmware/qcom/qcom_pas.h >> >> diff --git a/drivers/firmware/qcom/Kconfig b/drivers/firmware/qcom/Kconfig >> index b477d54b495a..8653639d06db 100644 >> --- a/drivers/firmware/qcom/Kconfig >> +++ b/drivers/firmware/qcom/Kconfig >> @@ -6,6 +6,14 @@ >> >> menu "Qualcomm firmware drivers" >> >> +config QCOM_PAS >> + tristate >> + help >> + 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. >> + >> config QCOM_SCM >> select QCOM_TZMEM >> tristate >> diff --git a/drivers/firmware/qcom/Makefile b/drivers/firmware/qcom/Makefile >> index 0be40a1abc13..dc5ab45f906a 100644 >> --- a/drivers/firmware/qcom/Makefile >> +++ b/drivers/firmware/qcom/Makefile >> @@ -8,3 +8,4 @@ qcom-scm-objs += qcom_scm.o qcom_scm-smc.o qcom_scm-legacy.o >> obj-$(CONFIG_QCOM_TZMEM) += qcom_tzmem.o >> obj-$(CONFIG_QCOM_QSEECOM) += qcom_qseecom.o >> obj-$(CONFIG_QCOM_QSEECOM_UEFISECAPP) += qcom_qseecom_uefisecapp.o >> +obj-$(CONFIG_QCOM_PAS) += qcom_pas.o >> diff --git a/drivers/firmware/qcom/qcom_pas.c b/drivers/firmware/qcom/qcom_pas.c >> new file mode 100644 >> index 000000000000..beb1bae55546 >> --- /dev/null >> +++ b/drivers/firmware/qcom/qcom_pas.c >> @@ -0,0 +1,298 @@ >> +// SPDX-License-Identifier: GPL-2.0 >> +/* >> + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries. >> + */ >> + >> +#include >> +#include >> +#include >> +#include >> + >> +#include "qcom_pas.h" >> + >> +struct qcom_pas_ops *ops_ptr; > > Same comment as before. Don't create singletons. And for sure not global > ones. I agree, no globals here please. > > Best regards, > Krzysztof