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Tue, 15 Sep 2026 16:22:08 -0700 (PDT) X-Received: by 2002:a05:6a21:9090:b0:3d0:e034:a26f with SMTP id adf61e73a8af0-3dd5f5d8672mr1167615637.17.1789514527903; Tue, 15 Sep 2026 16:22:07 -0700 (PDT) Received: from localhost ([50.35.44.179]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-33bf5b0520asm2203060eec.27.2026.09.15.16.22.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Sep 2026 16:22:07 -0700 (PDT) Date: Tue, 15 Sep 2026 16:22:04 -0700 From: Jonathan Cameron To: Nicolin Chen Cc: , , , , , , , , , , Jean-Philippe Brucker , "Eric Auger" , , , , , , , , , Subject: Re: [PATCH v5 10/15] iommu/arm-smmu-v3: Support PRI Page Request in arm_smmu_handle_ppr() Message-ID: <20260915162204.000054b9@oss.qualcomm.com> In-Reply-To: References: Organization: Qualcomm X-Mailer: Claws Mail 4.4.0 (GTK 3.24.51; x86_64-w64-mingw32) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Info: AW1haW4tMjYwOTE1MDM0MSBTYWx0ZWRfX4WmThVfuvQYM 54DUCsJcSdfGlSYyy1pfwvNGj0dAfTWG3LWGri+UH7NESSaei9ltBk291ce3aQSudO7TGHkFWU4 biK+hYtuv+RcTYQOe3oh0xfsVgW2eY4= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTE1MDM0MSBTYWx0ZWRfX4QIBryH4tJ/T HEZhI9CRo80n6V9jy4FkDcVBRj3vM387zH2WNIodV0RMc92WD5HQdxwzD+yrPWqKq8oBpfzen1+ wOK3ix579T72vQuoLtQO0bZ2SPvUP9e198UyUJjUDz1dgFGHILHmtan+QSMlXUVoH+Vm6yHNwvJ YPVLtaf0AGVrEaSSNvpGuPDK+pL4gFg0q8jGTMPreU37TRGPyaJLX/3aaemByB1PlW5w7kOXgDw KVfWXphKcEyxo33XuGSQiCfVRyTZonCqShydeV2mECH+V6L7yBgjkJNuj5gNjOuHcl74G1rh2eq 3da8biDuR4kULK/6z53TT6IMC0OH0+90BGL9InhOcjXVeGzZZ+ME2+iph+a1EBIGNgTtBKK1xcW LAHje0y9qTUKVF2LVtENedggNb/bM6llV3V9Q/tbAEud4sdS+XNnbwaxSU9zaKe5toFOz2xBGKs OZ7fnLvrNSY9gmpKazQ== X-Proofpoint-GUID: Lnw0rAxV9lRe9K3BgShPN5pPpRA-3ny- X-Proofpoint-ORIG-GUID: Lnw0rAxV9lRe9K3BgShPN5pPpRA-3ny- X-Authority-Analysis: v=2.4 cv=PcZqFShd c=1 sm=1 tr=0 ts=6aa9d321 cx=c_pps a=mDZGXZTwRPZaeRUbqKGCBw==:117 a=aNnz9XPx1a4JIXSYt2cE/A==:17 a=kj9zAlcOel0A:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=Ikd4Dj_1AAAA:8 a=EUspDBNiAAAA:8 a=h35TsNJSbmzmzvWWgmEA:9 a=CjuIK1q_8ugA:10 a=zc0IvFSfCIW2DFIPzwfm:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-15_05,2026-09-15_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 phishscore=0 suspectscore=0 malwarescore=0 impostorscore=0 clxscore=1015 lowpriorityscore=0 priorityscore=1501 adultscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609150341 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260915_162211_166587_E8800E99 X-CRM114-Status: GOOD ( 18.45 ) 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 On Tue, 15 Sep 2026 09:38:22 -0700 Nicolin Chen wrote: > For a PRI-enabled master, convert every PRIQ entry into an iopf_fault and > report it through iommu_report_device_fault(). > > For an unknown StreamID or a master without PRI enabled, keep the existing > LAST-page DENY path. Merge its two messages into one ratelimited line so a > faulty device cannot flood the kernel log. > > Discard any PASID Stop Marker (LRW = 0b100) prior to the fault report and > the DENY fallback both, because a Stop Marker does not expect a response. > The IOPF infrastructure requires the driver to discard it, as per the doc > at iommu_report_device_fault(). This also matches the intel-iommu code. > > When SSV is clear, the same LRW encoding is a PRI Page Request that expects > a response, so let it fall through. > > Note that master->pri_enabled will only be set by a later change, once all > the PRI paths are ready. > > Co-developed-by: Barak Biber > Signed-off-by: Barak Biber > Co-developed-by: Stefan Kaestle > Signed-off-by: Stefan Kaestle > Signed-off-by: Malak Marrid > Signed-off-by: Nicolin Chen Reviewed-by: Jonathan Cameron