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Thu, 20 Aug 2026 14:42:04 -0700 (PDT) From: Andrew Jones To: linux-riscv@lists.infradead.org, iommu@lists.linux.dev Cc: linux-kernel@vger.kernel.org, tomasz.jeznach@linux.dev, tjeznach@rivosinc.com, jgg@ziepe.ca, jgg@nvidia.com, joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, pjw@kernel.org, palmer@dabbelt.com, anup@brainfault.org, tglx@kernel.org, kevin.tian@intel.com, fangyu.yu@linux.alibaba.com, Nutty Liu Subject: [PATCH v4 06/21] genirq/msi: Provide DOMAIN_BUS_MSI_REMAP Date: Thu, 20 Aug 2026 23:41:35 +0200 Message-ID: <20260820214150.545737-7-andrew.jones@oss.qualcomm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260820214150.545737-1-andrew.jones@oss.qualcomm.com> References: <20260820214150.545737-1-andrew.jones@oss.qualcomm.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-ORIG-GUID: XTfTLS7OH3JT9enscPOnuaWGXwvb4KNU X-Authority-Analysis: v=2.4 cv=G7Is1dk5 c=1 sm=1 tr=0 ts=6a8774ad cx=c_pps a=HLyN3IcIa5EE8TELMZ618Q==:117 a=CzrpMg+lqiTzknPDBj2tlw==:17 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=EUspDBNiAAAA:8 a=69EAbJreAAAA:8 a=cHhBG6FuOey2j-0mYlgA:9 a=bTQJ7kPSJx9SKPbeHEYW:22 X-Proofpoint-GUID: XTfTLS7OH3JT9enscPOnuaWGXwvb4KNU X-Proofpoint-Spam-Info: AW1haW4tMjYwODIwMDE2MiBTYWx0ZWRfX9eKYfCFJbCcW oUtwSH0hyXUIti2DfoDHIUsg6S41t+pYJnrHp0exzuJnLbf+4/wH28MEww/w2hqIk70Z1KbxPp5 AEhx7QPhNHMnMaJcd2zDwQ6/5I7a24U= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODIwMDE2MiBTYWx0ZWRfXyQ0mD5B4GdBA n6K37xJjOjfwhnKh012DPkfJdF2WzDHnPuALlvLa8P6zFNpvrS6rwrx9AqTpg3BsTlVH7hBki+M fXBKQNrqGoLmpM/EARJxum5qysO8+PDmkctV7oQLytFKKaZPbiNOwW+TksiNgVCdLIKAqToxPIt Hq+CqZ84vmuRE2QkqVUjlsxubxf04pYULJbUbcuxOepXzy28yro4BKkH7ebLnVZviGy33WiqX5F 0zEJutfOZ8ciJMXGfHSRUK9m30EXlEpeVmAjGmsmmH0I+ebXT/l5VtBiet33uIk1KzsRZh+lQF7 pvB3p2moD7bwLBfNSXJH4KSFVd4wkLNrjdADuX26CjNg0pAHDq0uKKhjviNPJMF8ofgp9hrNs/o RQShVlO6Tv7nIVze5IfoumXwD02EaxDduWCw9tDPlqorHHmjGeGyBlkl6o7t/SDAX9w3WoHB1wr gZD4OduNcp21Z3PPeaA== 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=2026-08-20_02,2026-08-20_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 suspectscore=0 clxscore=1015 phishscore=0 bulkscore=0 lowpriorityscore=0 priorityscore=1501 adultscore=0 malwarescore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608200162 Add a bus token for MSI domains that remap interrupts, needed by the upcoming RISC-V IOMMU interrupt-remapping domain to distinguish itself from NEXUS domains. The token is generic because remapping itself is the only property that needs to be conveyed -- there is nothing RISC-V-specific about it. Such a domain implements init_dev_msi_info() via msi_parent_init_dev_msi_info(), which leaves 'domain' pointing at the NEXUS domain while 'real_parent' points at the remap domain itself. Accept that combination in msi_lib_init_dev_msi_info(); no other msi-lib changes are needed. Signed-off-by: Andrew Jones Reviewed-by: Nutty Liu --- drivers/irqchip/irq-msi-lib.c | 8 ++++---- include/linux/irqdomain_defs.h | 1 + 2 files changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/irqchip/irq-msi-lib.c b/drivers/irqchip/irq-msi-lib.c index 45e0ed3134ce..9027dfbab15e 100644 --- a/drivers/irqchip/irq-msi-lib.c +++ b/drivers/irqchip/irq-msi-lib.c @@ -36,14 +36,14 @@ bool msi_lib_init_dev_msi_info(struct device *dev, struct irq_domain *domain, return false; /* - * MSI parent domain specific settings. For now there is only the - * root parent domain, e.g. NEXUS, acting as a MSI parent, but it is - * possible to stack MSI parents. See x86 vector -> irq remapping + * MSI parent domain specific settings. There may be only the root + * parent domain, e.g. NEXUS, acting as a MSI parent, or there may + * be stacked MSI parents, typically used for remapping. */ if (domain->bus_token == pops->bus_select_token) { if (WARN_ON_ONCE(domain != real_parent)) return false; - } else { + } else if (real_parent->bus_token != DOMAIN_BUS_MSI_REMAP) { WARN_ON_ONCE(1); return false; } diff --git a/include/linux/irqdomain_defs.h b/include/linux/irqdomain_defs.h index 3a03bdfeeee9..954cf585b3c4 100644 --- a/include/linux/irqdomain_defs.h +++ b/include/linux/irqdomain_defs.h @@ -26,6 +26,7 @@ enum irq_domain_bus_token { DOMAIN_BUS_AMDVI, DOMAIN_BUS_DEVICE_MSI, DOMAIN_BUS_WIRED_TO_MSI, + DOMAIN_BUS_MSI_REMAP, }; #endif /* _LINUX_IRQDOMAIN_DEFS_H */ -- 2.43.0 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5EAEFC5DF81 for ; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org Add a bus token for MSI domains that remap interrupts, needed by the upcoming RISC-V IOMMU interrupt-remapping domain to distinguish itself from NEXUS domains. The token is generic because remapping itself is the only property that needs to be conveyed -- there is nothing RISC-V-specific about it. Such a domain implements init_dev_msi_info() via msi_parent_init_dev_msi_info(), which leaves 'domain' pointing at the NEXUS domain while 'real_parent' points at the remap domain itself. Accept that combination in msi_lib_init_dev_msi_info(); no other msi-lib changes are needed. Signed-off-by: Andrew Jones Reviewed-by: Nutty Liu --- drivers/irqchip/irq-msi-lib.c | 8 ++++---- include/linux/irqdomain_defs.h | 1 + 2 files changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/irqchip/irq-msi-lib.c b/drivers/irqchip/irq-msi-lib.c index 45e0ed3134ce..9027dfbab15e 100644 --- a/drivers/irqchip/irq-msi-lib.c +++ b/drivers/irqchip/irq-msi-lib.c @@ -36,14 +36,14 @@ bool msi_lib_init_dev_msi_info(struct device *dev, struct irq_domain *domain, return false; /* - * MSI parent domain specific settings. For now there is only the - * root parent domain, e.g. NEXUS, acting as a MSI parent, but it is - * possible to stack MSI parents. See x86 vector -> irq remapping + * MSI parent domain specific settings. There may be only the root + * parent domain, e.g. NEXUS, acting as a MSI parent, or there may + * be stacked MSI parents, typically used for remapping. */ if (domain->bus_token == pops->bus_select_token) { if (WARN_ON_ONCE(domain != real_parent)) return false; - } else { + } else if (real_parent->bus_token != DOMAIN_BUS_MSI_REMAP) { WARN_ON_ONCE(1); return false; } diff --git a/include/linux/irqdomain_defs.h b/include/linux/irqdomain_defs.h index 3a03bdfeeee9..954cf585b3c4 100644 --- a/include/linux/irqdomain_defs.h +++ b/include/linux/irqdomain_defs.h @@ -26,6 +26,7 @@ enum irq_domain_bus_token { DOMAIN_BUS_AMDVI, DOMAIN_BUS_DEVICE_MSI, DOMAIN_BUS_WIRED_TO_MSI, + DOMAIN_BUS_MSI_REMAP, }; #endif /* _LINUX_IRQDOMAIN_DEFS_H */ -- 2.43.0 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv