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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b9d6de8d689sm399063066b.3.2026.04.14.03.47.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 14 Apr 2026 03:47:49 -0700 (PDT) Message-ID: <578eba18-1a9c-4aa6-8c49-58d271b1b609@oss.qualcomm.com> Date: Tue, 14 Apr 2026 12:47:47 +0200 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 01/35] dt-bindings: qcom,pdc: Tighten reg to single APSS DRV region To: Mukesh Ojha Cc: Dmitry Baryshkov , Thomas Gleixner , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Konrad Dybcio , cros-qcom-dts-watchers@chromium.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org References: <20260410184124.1068210-1-mukesh.ojha@oss.qualcomm.com> <20260410184124.1068210-2-mukesh.ojha@oss.qualcomm.com> <20260414082426.fhkgwpjth7a6hzxe@hu-mojha-hyd.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260414082426.fhkgwpjth7a6hzxe@hu-mojha-hyd.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDE0MDEwMSBTYWx0ZWRfX+XWiYBWdzY+u srYiCZ0V3Try3jbtiNj/ou7fs6fkb5nHzBdOTdQ2/8Ihw/jb6PpDO/aZcMtuDyczSNUR4W6iNjE new6eYWct38fJZWL3HdCT2ExbMi4KFumdkXuDu04ZBsTd4ziyuY6gwI2kQ8kdBCd2KwjowO5CLl 9feB1cD5uR5F1HoLMKJ0xWqVwaR/73SCcI/dyxA6EOn+uJ97bsdZkaBeZcwGcF3kRHS197uey75 Ia0LwlFjDjC7BaEZhmedACsSEluZZPLUCAdWlGLYqufJ64R6dVWTDdT7O5sZ/p8eXX9YRqlMcPL rxOEqbIar5vEb9iS24x3F3tzg2f4oUYL2wdgK99wGMTwXwJK/yPHPmYQ2znV3Z2Z3oSNgkXaWnt lfasyHe1E42ZRvB/tAKkjqTXNwreT3Tg8j0wanWbXwyVmgbSFT3zEmzGhc2hPIYerxvREVEKpjC oJo46Irard6KUuUr32w== X-Authority-Analysis: v=2.4 cv=DaYnbPtW c=1 sm=1 tr=0 ts=69de1b58 cx=c_pps a=EVbN6Ke/fEF3bsl7X48z0g==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=Um2Pa8k9VHT-vaBCBUpS:22 a=Aw8xZ2Yx19VhUrNpqvQA:9 a=QEXdDO2ut3YA:10 a=zZCYzV9kfG8A:10 a=a_PwQJl-kcHnX1M80qC6:22 X-Proofpoint-GUID: jGsDAFThUEbnMmgKaIBu8GFpiu9AO2ap X-Proofpoint-ORIG-GUID: jGsDAFThUEbnMmgKaIBu8GFpiu9AO2ap 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=2026-04-14_02,2026-04-13_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 suspectscore=0 malwarescore=0 phishscore=0 priorityscore=1501 bulkscore=0 clxscore=1015 adultscore=0 spamscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604140101 On 4/14/26 10:24 AM, Mukesh Ojha wrote: > On Mon, Apr 13, 2026 at 10:23:59AM +0200, Konrad Dybcio wrote: >> On 4/11/26 4:32 PM, Dmitry Baryshkov wrote: >>> On Sat, Apr 11, 2026 at 12:10:38AM +0530, Mukesh Ojha wrote: >>>> The PDC has multiple DRV regions, each sized 0x10000, where each region >>>> serves a specific client in the system. Linux only needs access to the >>> >>> Nit: there are other OS than Linux. Would you rather point out that >>> other DRV regions are to be used by ... what? >> >> TZ, HYP, HLOS, CPUCP.. > > Thanks for pitching in.. > >> >> I'm wondering if we can make use of the HYP one on e.g. Glymur, to >> parallelize accesses (and whether that would bring any practical >> benefit). > > I mean, Ideally, It makes sense to utilize extra 0x10000 to use or just > to use the hypervisor one for Glymur. Which one does the UEFI use? Konrad