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Tue, 27 Oct 2026 08:58:42 -0700 (PDT) Received: from [192.168.226.26] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6b49640f1b9sm227658a12.19.2026.10.27.08.58.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 27 Oct 2026 08:58:41 -0700 (PDT) Message-ID: <9a299c47-a92b-4086-8218-3f6a06a25460@oss.qualcomm.com> Date: Tue, 27 Oct 2026 16:58:38 +0100 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/3] firmware: qcom: pas: Add optional video memory protection op To: Sumit Garg , Bjorn Andersson , Konrad Dybcio , Vikash Garodia , Dikshita Agarwal , Abhinav Kumar , Bryan O'Donoghue , Mauro Carvalho Chehab Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, Jorge Ramirez-Ortiz , Jorge Ramirez-Ortiz , Sumit Garg References: <20261027-pas-video-v2-0-5b52bca5add6@oss.qualcomm.com> <20261027-pas-video-v2-1-5b52bca5add6@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20261027-pas-video-v2-1-5b52bca5add6@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDI3MDA2MyBTYWx0ZWRfX5Kcp2dJl4NU/ ZqCLmXGiQ8yuuePnBplizNVh7fZojK8GrU9xv9F/jZySrowhSI28ZxOZ2s9d+J496EDtqVrGCTl 5DlSSCENRwBq9KRciPDYbRZpSKNm68eBTPNBCvwpnrlFPSI6VWI9bT30o45j7OyeLB4re8EMwOq /81PYZ4ozzfSTVfO34j9sz69hj8in5Ela/yCdioZoc2xSQJH0Bnlv4qofJwlXWyX10Xgha35hJU kX/QXTESgh47J6WUVP1JXLBnsoXYYYJKDwavbX9FIRLZLunRp5lxacVbHnxXHruFxeAYu7YP7in nmsSC3TgNjH8b2nJUmGD3OLATKRqK8bOk7WoZwPnR8JAaSOugEdKz42SXSG6gFvihK9GUINEF4s a/5vi/IvYjNgUA9DgVi4Lp9e8rmIeHX/k/JmoSxnBFdT6k0tWNzrFV0FXYAt5pbg9E/fZVNHy2e WYRQzoZhParw7fcRzhQ== X-Proofpoint-GUID: PpR-j0KzvABkQ_fhRc4OR57DnwK-AoI- X-Proofpoint-Spam-Info: AW1haW4tMjYxMDI3MDA2MyBTYWx0ZWRfX/VPN1x2GGKIt dRBuG+e98bBDOZgj0IwUIzRhnS/Gj+ncSR/MfUh2rBGMnnJwJBpt7xyMtJprZhBz9ftgcWQvkTb Bl4hzDrMOH94QvjnPEMKw6Oy5+b8TWE= X-Authority-Analysis: v=2.4 cv=PsYG/AM3 c=1 sm=1 tr=0 ts=6ae0ca33 cx=c_pps a=DUEm7b3gzWu7BqY5nP7+9g==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=EUspDBNiAAAA:8 a=FUnjqt_kGT4GknzHWowA:9 a=QEXdDO2ut3YA:10 a=-aSRE8QhW-JAV6biHavz:22 X-Proofpoint-ORIG-GUID: PpR-j0KzvABkQ_fhRc4OR57DnwK-AoI- X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-10-27_03,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 spamscore=0 phishscore=0 adultscore=0 lowpriorityscore=0 priorityscore=1501 bulkscore=0 impostorscore=0 clxscore=1015 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610270063 On 10/27/26 1:39 PM, Sumit Garg wrote: > From: Sumit Garg > > qcom_scm_mem_protect_video_var() is only serviced by the SCM backend. > Other PAS backends, e.g. OP-TEE, own secure memory protection and don't > implement such a call. > > Add an optional mem_protect_video_var() PAS op along with a generic > qcom_pas_mem_protect_video_var() wrapper so that clients stay agnostic > of the active backend. The SCM backend maps it to the existing SCM call > while backends leaving it unset turn it into a no-op. > > Signed-off-by: Sumit Garg > --- I agree it's imperfect but it fits better Reviewed-by: Konrad Dybcio Konrad