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Thu, 23 Apr 2026 22:57:23 -0700 (PDT) Received: from hu-vjitta-hyd.qualcomm.com ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c79770512afsm17288101a12.31.2026.04.23.22.57.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Apr 2026 22:57:23 -0700 (PDT) From: Vijayanand Jitta Subject: [PATCH v14 0/3] of: parsing of multi #{iommu,msi}-cells in maps Date: Fri, 24 Apr 2026 11:26:07 +0530 Message-Id: <20260424-parse_iommu_cells-v14-0-fd02f11b6c38@oss.qualcomm.com> Precedence: bulk X-Mailing-List: imx@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-B4-Tracking: v=1; b=H4sIAPgF62kC/33PwW7DIAwG4FepOI8KQ2Bhp73HNFWOMStS2nSwR puqvPtoL8uB7GLpt+zP8k0UzomLeNndROY5lTSda4DuaSfoiOcPlinUhtBKO2UUyAvmwoc0nU7 XA/E4FglkzLPrkYcBRd27ZI7p+4G+vdd8TOVryj+PG7O/d//TZi+V7AIMxExkGV6nUvafVxypT u1rEXd0BrWWfEsCVSlyOhKiRQj9FgUrStsmBZWCyBEtKe41bVF6RZnmf6ArFZhiMMoyo9+izB/ Vqb5JmUpF9BrYa+dgaFDLsvwCdDU36+YBAAA= X-Change-ID: 20260301-parse_iommu_cells-1c33768aebba To: Nipun Gupta , Nikhil Agarwal , Joerg Roedel , Will Deacon , Robin Murphy , Marc Zyngier , Lorenzo Pieralisi , Thomas Gleixner , Saravana Kannan , Richard Zhu , Lucas Stach , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Manivannan Sadhasivam , Bjorn Helgaas , Frank Li , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko , Dmitry Baryshkov , Konrad Dybcio , Bjorn Andersson , Rob Herring , Conor Dooley , Krzysztof Kozlowski , Prakash Gupta , Vikash Garodia Cc: linux-kernel@vger.kernel.org, iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-pci@vger.kernel.org, imx@lists.linux.dev, xen-devel@lists.xenproject.org, linux-arm-msm@vger.kernel.org, Vijayanand Jitta , Charan Teja Kalla X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1777010232; l=8281; i=vijayanand.jitta@oss.qualcomm.com; s=20260301; h=from:subject:message-id; bh=PeFaW7Kdrw7pS2+czBSVD/S1WiB/N+6erzrmdMB/5Y8=; b=fEKGmPri8LDYPP4nIodsRoCyeyYT1OGPS0OqEqaH/APENLrZpB+Q8nuTYzbfPqq917ee5aP2w JYKMUiobPcFDsrp7EnUv2N9T4k7yYV5sMOp4PQ9MR9EoL3rLLaW0Suj X-Developer-Key: i=vijayanand.jitta@oss.qualcomm.com; a=ed25519; pk=Lpi7Cs3wHe8KZtqvyci7FTOLzsKpEHKGCaPNZw+1zRI= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDI0MDA1MSBTYWx0ZWRfX6Xvmb0OvFcy4 us2Oa6/OdJFkpWk9rz4+09UCgnR91Q8IJ6tygBQP/8yUoN8GFQ8gm+qM5kyktLaNjFHVgD8m7IK ELAzfRVPWw31NTGhId0P2lq1q8gDb+bd2uvqllqhVRqC9NpQtD8L2QImucY4Bh7kIsJnHs6yHJd 3vNBQU7mi5L515cbThBlBJueCGvksOQByyJE1MAuIAMC5ScV62os3QiukN05nHzD+ZoMwAqJBDg JjsScOEzQ3rtaK9BiVY35NAASfYQBZWSFACu6bc1JFeXFqvJ+rN6XjBS92FaXVYVvotHLaqQf5T KrT2gVuxC5kyMXaJev+kctmnpZdnfETT5QGVtAH1vDeHBZWShpT35C3JmW/lThqtYR7hAu53XFD lbqJCnFveW1WUgW/jfAlQYwow31tQjYWGisZlXqp4RLVqYpbZPt0oYN9YSvVusYsDGZpKrmlYSj /Yfzn59bPGbpCKu5xpA== X-Authority-Analysis: v=2.4 cv=TtnWQjXh c=1 sm=1 tr=0 ts=69eb0645 cx=c_pps a=Qgeoaf8Lrialg5Z894R3/Q==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=VwQbUJbxAAAA:8 a=COk6AnOGAAAA:8 a=NEAV23lmAAAA:8 a=bC-a23v3AAAA:8 a=EUspDBNiAAAA:8 a=zd2uoN0lAAAA:8 a=tA7aZXjiAAAA:8 a=7CQSdrXTAAAA:8 a=8AirrxEcAAAA:8 a=1XWaLZrsAAAA:8 a=pGLkceISAAAA:8 a=iox4zFpeAAAA:8 a=DBfv99YmAAAA:8 a=JfrnYn6hAAAA:8 a=cWRNjhkoAAAA:8 a=fRNrpDd4OrOfg74B-YAA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=x9snwWr2DeNwDh03kgHS:22 a=TjNXssC_j7lpFel5tvFf:22 a=FO4_E8m0qiDe52t0p3_H:22 a=kIIFJ0VLUOy1gFZzwZHL:22 a=a-qgeE7W1pNrGK8U0ZQC:22 a=ST-jHhOKWsTCqRlWije3:22 a=WzC6qhA0u3u7Ye7llzcV:22 a=1CNFftbPRP8L7MoqJWF3:22 a=sVa6W5Aao32NNC1mekxh:22 X-Proofpoint-ORIG-GUID: GaCH5Me57pWvo2NzTNT7qEcVpxFf4-vA X-Proofpoint-GUID: GaCH5Me57pWvo2NzTNT7qEcVpxFf4-vA 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=2026-04-23_03,2026-04-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 malwarescore=0 clxscore=1015 adultscore=0 spamscore=0 bulkscore=0 suspectscore=0 phishscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604240051 So far our parsing of {iommu,msi}-map properties has always blindly assumed that the output specifiers will always have exactly 1 cell. This typically does happen to be the case, but is not actually enforced (and the PCI msi-map binding even explicitly states support for 0 or 1 cells) - as a result we've now ended up with dodgy DTs out in the field which depend on this behaviour to map a 1-cell specifier for a 2-cell provider, despite that being bogus per the bindings themselves. Since there is some potential use[1] in being able to map at least single input IDs to multi-cell output specifiers (and properly support 0-cell outputs as well), add support for properly parsing and using the target nodes' #cells values, albeit with the unfortunate complication of still having to work around expectations of the old behaviour too. -- Robin. Unlike single #{}-cell, it is complex to establish a linear relation between input 'id' and output specifier for multi-cell properties, thus it is always expected that len never going to be > 1. These changes have been tested on QEMU for the arm64 architecture. Since, this would also need update in dt-schema, raised PR[2] for the same. [1] https://lore.kernel.org/all/20250627-video_cb-v3-0-51e18c0ffbce@quicinc.com/ [2] PR for iommu-map dtschema: https://github.com/devicetree-org/dt-schema/pull/184 V14: - Updated Patch 2 ("of: Factor arguments passed to of_map_id() into a struct") to fix below two issues in of_msi_xlate() that were introduced by the API refactoring: 1) The refactoring changed of_map_id()'s dual-purpose **target parameter to an explicit filter_np parameter. In of_msi_xlate(), this caused of_map_msi_id() to return 0 (pass-through) instead of -ENODEV when a node has no msi-map, terminating the device hierarchy walk prematurely before reaching the root complex node that has the msi-map. This broke MSI allocation for PCIe endpoint devices (e.g., wcn7850 Wi-Fi on ARM64). 2) Additionally, fsl_mc_get_msi_id() passes msi_np == NULL to of_msi_xlate(), which would dereference NULL with the new API. Link to v13: https://patch.msgid.link/20260408-parse_iommu_cells-v13-0-fa921e92661b@oss.qualcomm.com V13: - Fix bad_map handling in of_map_id(): 'cells' is re-initialized to 0 on each loop iteration, so the !bad_map guard was insufficient, cells stayed 0 for all entries after the first. Fix by explicitly setting cells=1 when bad_map is true on every iteration. - Collected Acked-by from Frank Li. Link to v12: https://patch.msgid.link/20260331-parse_iommu_cells-v12-0-decfd305eea9@oss.qualcomm.com V12: - Call of_node_put() unconditionally in imx_pcie_add_lut_by_rid() thereby addressing comments from Bjorn Helgaas. Link to v11: https://lore.kernel.org/r/20260325-parse_iommu_cells-v11-0-1fefa5c0e82c@oss.qualcomm.com V11: - Added explicit filter_np parameter to of_map_id() and of_map_msi_id() per Dmitry Baryshkov's review feedback, making the filter explicit instead of overloading arg->np as both input filter and output parameter. - Removed of_node_put() from inside of_map_id(), making the caller responsible for reference management. Updated of_msi_xlate() to properly handle reference counting. - Collected ACKed by tags, and fixed minor typos. Link to v10: https://lore.kernel.org/r/20260309-parse_iommu_cells-v10-0-c62fcaa5a1d8@oss.qualcomm.com V10: - Move of_map_iommu_id()/of_map_msi_id() from include/linux/of.h to drivers/of/base.c as out-of-line helpers per feedback from Marc Zyngier and Rob Herring. - Add kernel-doc to document both helpers for discoverability and usage clarity. - Fix of_map_msi_id() wrapper and all its callers (cdx_msi.c, irq-gic-its-msi-parent.c, drivers/of/irq.c) to correctly use the new struct of_phandle_args-based API with proper of_node_put() handling as per feeback from Dmitry. Link to v9: https://lore.kernel.org/r/20260301-parse_iommu_cells-v9-0-4d1bceecc5e1@oss.qualcomm.com V9: - Updated TO/CC list based on feedback to include all relevant maintainers. - No functional changes to the patches themselves. Link to V8: https://lore.kernel.org/all/20260226074245.3098486-1-vijayanand.jitta@oss.qualcomm.com/ V8: - Removed mentions of of_map_args from commit message to match code. Link to V7: https://lore.kernel.org/all/20260210101157.2145113-1-vijayanand.jitta@oss.qualcomm.com/ V7: - Removed of_map_id_args structure and replaced it with of_phandle_args as suggested by Dmitry. Link to V6: https://lore.kernel.org/all/20260121055400.937856-1-vijayanand.jitta@oss.qualcomm.com/ V6: - Fixed build error reported by kernel test bot. Link to V5: https://lore.kernel.org/all/20260118181125.1436036-1-vijayanand.jitta@oss.qualcomm.com/ V5: - Fixed Build Warnings. - Raised PR for iommu-map dtschema: https://github.com/devicetree-org/dt-schema/pull/184 Link to V4: https://lore.kernel.org/all/20251231114257.2382820-1-vijayanand.jitta@oss.qualcomm.com/ V4: - Added Reviewed-by tag. - Resolved warnings reported by kernel test bot, minor code reorganization. Link to V3: https://lore.kernel.org/all/20251221213602.2413124-1-vijayanand.jitta@oss.qualcomm.com/ V3: - Added Reviewed-by tag. - Updated of_map_id_args struct as a wrapper to of_phandle_args and added comment description as suggested by Rob Herring. Link to V2: https://lore.kernel.org/all/20251204095530.8627-1-vijayanand.jitta@oss.qualcomm.com/ V2: - Incorporated the patches from Robin that does the clean implementation. - Dropped the patches the were adding multi-map support from this series as suggested. V1: https://lore.kernel.org/all/cover.1762235099.git.charan.kalla@oss.qualcomm.com/ RFC: https://lore.kernel.org/all/20250928171718.436440-1-charan.kalla@oss.qualcomm.com/#r Signed-off-by: Vijayanand Jitta --- To: Nipun Gupta To: Nikhil Agarwal To: Joerg Roedel To: Will Deacon To: Robin Murphy To: Lorenzo Pieralisi To: Marc Zyngier To: Thomas Gleixner To: Rob Herring To: Saravana Kannan To: Richard Zhu To: Lucas Stach To: Krzysztof Wilczyński To: Manivannan Sadhasivam To: Bjorn Helgaas To: Frank Li To: Sascha Hauer To: Pengutronix Kernel Team To: Fabio Estevam To: Juergen Gross To: Stefano Stabellini To: Oleksandr Tyshchenko Cc: linux-arm-msm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: iommu@lists.linux.dev Cc: linux-arm-kernel@lists.infradead.org Cc: devicetree@vger.kernel.org Cc: linux-pci@vger.kernel.org Cc: imx@lists.linux.dev Cc: xen-devel@lists.xenproject.org --- Charan Teja Kalla (1): of: Factor arguments passed to of_map_id() into a struct Robin Murphy (2): of: Add convenience wrappers for of_map_id() of: Respect #{iommu,msi}-cells in maps drivers/cdx/cdx_msi.c | 8 +- drivers/iommu/of_iommu.c | 6 +- drivers/irqchip/irq-gic-its-msi-parent.c | 11 +- drivers/of/base.c | 215 ++++++++++++++++++++++++------- drivers/of/irq.c | 31 ++++- drivers/pci/controller/dwc/pci-imx6.c | 34 +++-- drivers/pci/controller/pcie-apple.c | 6 +- drivers/xen/grant-dma-ops.c | 5 +- include/linux/of.h | 30 ++++- 9 files changed, 257 insertions(+), 89 deletions(-) --- base-commit: 3fa5e5702a82d259897bd7e209469bc06368bf31 change-id: 20260301-parse_iommu_cells-1c33768aebba Best regards, -- Vijayanand Jitta