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Mon, 11 Sep 2023 22:09:47 +0000 From: Frank Li To: manivannan.sadhasivam@linaro.org Cc: Frank.li@nxp.com, aisheng.dong@nxp.com, bhelgaas@google.com, devicetree@vger.kernel.org, festevam@gmail.com, imx@lists.linux.dev, jdmason@kudzu.us, kernel@pengutronix.de, kishon@kernel.org, kw@linux.com, linux-arm-kernel@lists.infradead.org, linux-imx@nxp.com, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, lorenzo.pieralisi@arm.com, lpieralisi@kernel.org, maz@kernel.org, s.hauer@pengutronix.de, shawnguo@kernel.org, tglx@linutronix.de Subject: [PATCH v2 1/5] PCI: endpoint: Add RC-to-EP doorbell support using platform MSI controller Date: Mon, 11 Sep 2023 18:09:16 -0400 Message-Id: <20230911220920.1817033-2-Frank.Li@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230911220920.1817033-1-Frank.Li@nxp.com> References: <20230911220920.1817033-1-Frank.Li@nxp.com> X-ClientProxiedBy: BYAPR07CA0010.namprd07.prod.outlook.com (2603:10b6:a02:bc::23) To AM6PR04MB4838.eurprd04.prod.outlook.com (2603:10a6:20b:4::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM6PR04MB4838:EE_|PAXPR04MB8125:EE_ X-MS-Office365-Filtering-Correlation-Id: defeff76-23ec-4301-9d8d-08dbb313cfef X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Maps the memory assigned for the BAR region by the PCI host to the message address of the platform MSI interrupt controller in the PCI EP. As a result, when the PCI RC writes to the BAR region, it triggers an IRQ at the EP. This implementation serves as a common method for all endpoint function drivers. However, it currently supports only one EP physical function due to limitations in ARM MSI/IMS readiness. Signed-off-by: Frank Li --- drivers/pci/endpoint/pci-epc-core.c | 192 ++++++++++++++++++++++++++++ drivers/pci/endpoint/pci-epf-core.c | 44 +++++++ include/linux/pci-epc.h | 6 + include/linux/pci-epf.h | 7 + 4 files changed, 249 insertions(+) diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c index 5a4a8b0be6262..d336a99c6a94f 100644 --- a/drivers/pci/endpoint/pci-epc-core.c +++ b/drivers/pci/endpoint/pci-epc-core.c @@ -10,6 +10,7 @@ #include #include +#include #include #include #include @@ -783,6 +784,197 @@ void pci_epc_bme_notify(struct pci_epc *epc) } EXPORT_SYMBOL_GPL(pci_epc_bme_notify); +/** + * pci_epc_alloc_doorbell() - alloc an address space to let RC trigger EP side IRQ by write data to + * the space. + * + * @epc: the EPC device that need doorbell address and data from RC. + * @func_no: the physical endpoint function number in the EPC device. + * @vfunc_no: the virtual endpoint function number in the physical function. + * @num_msgs: the total number of doorbell messages + * + * Return: 0 success, other is failure + */ +int pci_epc_alloc_doorbell(struct pci_epc *epc, u8 func_no, u8 vfunc_no, int num_msgs) +{ + int ret; + + if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) + return -EINVAL; + + if (vfunc_no > 0 && (!epc->max_vfs || vfunc_no > epc->max_vfs[func_no])) + return -EINVAL; + + if (!epc->ops->alloc_doorbell) + return 0; + + mutex_lock(&epc->lock); + ret = epc->ops->alloc_doorbell(epc, func_no, vfunc_no, num_msgs); + mutex_unlock(&epc->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(pci_epc_alloc_doorbell); + +/** + * pci_epc_free_doorbell() - free resource allocated by pci_epc_alloc_doorbell() + * + * @epc: the EPC device that need doorbell address and data from RC. + * @func_no: the physical endpoint function number in the EPC device. + * @vfunc_no: the virtual endpoint function number in the physical function. + * + * Return: 0 success, other is failure + */ +void pci_epc_free_doorbell(struct pci_epc *epc, u8 func_no, u8 vfunc_no) +{ + if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) + return; + + if (vfunc_no > 0 && (!epc->max_vfs || vfunc_no > epc->max_vfs[func_no])) + return; + + if (!epc->ops->free_doorbell) + return; + + mutex_lock(&epc->lock); + epc->ops->free_doorbell(epc, func_no, vfunc_no); + mutex_unlock(&epc->lock); +} +EXPORT_SYMBOL_GPL(pci_epc_free_doorbell); + +static irqreturn_t pci_epf_generic_doorbell_handler(int irq, void *data) +{ + struct pci_epf *epf = data; + + if (epf->event_ops && epf->event_ops->doorbell) + epf->event_ops->doorbell(epf, irq - epf->virq_base); + + return IRQ_HANDLED; +} + +static void pci_epc_generic_write_msi_msg(struct msi_desc *desc, struct msi_msg *msg) +{ + struct pci_epc *epc = NULL; + struct class_dev_iter iter; + struct pci_epf *epf; + struct device *dev; + + class_dev_iter_init(&iter, pci_epc_class, NULL, NULL); + while ((dev = class_dev_iter_next(&iter))) { + if (dev->parent != desc->dev) + continue; + + epc = to_pci_epc(dev); + + class_dev_iter_exit(&iter); + break; + } + + if (!epc) + return; + + /* Only support one EPF for doorbell */ + epf = list_first_entry_or_null(&epc->pci_epf, struct pci_epf, list); + + if (!epf) + return; + + if (epf->msg && desc->msi_index < epf->num_msgs) + epf->msg[desc->msi_index] = *msg; +} + + +/** + * pci_epc_generic_alloc_doorbell() - Common help function. Allocate address space from MSI + * controller + * + * @epc: the EPC device that need doorbell address and data from RC. + * @func_no: the physical endpoint function number in the EPC device. + * @vfunc_no: the virtual endpoint function number in the physical function. + * @num_msgs: the total number of doorbell messages + * + * Remark: use this function only if EPC driver just register one EPC device. + * + * Return: 0 success, other is failure + */ +int pci_epc_generic_alloc_doorbell(struct pci_epc *epc, u8 func_no, u8 vfunc_no, int num_msgs) +{ + struct pci_epf *epf; + struct device *dev; + int virq, last; + int ret; + int i; + + if (IS_ERR_OR_NULL(epc)) + return -EINVAL; + + /* Currently only support one func and one vfunc for doorbell */ + if (func_no || vfunc_no) + return -EINVAL; + + epf = list_first_entry_or_null(&epc->pci_epf, struct pci_epf, list); + if (!epf) + return -EINVAL; + + dev = epc->dev.parent; + ret = platform_msi_domain_alloc_irqs(dev, num_msgs, pci_epc_generic_write_msi_msg); + if (ret) { + dev_err(dev, "Failed to allocate MSI\n"); + return -ENOMEM; + } + + last = -1; + for (i = 0; i < num_msgs; i++) { + virq = msi_get_virq(dev, i); + if (i == 0) + epf->virq_base = virq; + + ret = request_irq(virq, pci_epf_generic_doorbell_handler, 0, + kasprintf(GFP_KERNEL, "pci-epc-doorbell%d", i), epf); + + if (ret) { + dev_err(dev, "Failed to request doorbell\n"); + goto err_free_irq; + } + last = i; + } + + return 0; + +err_free_irq: + for (i = 0; i < last; i++) + kfree(free_irq(epf->virq_base + i, epf)); + platform_msi_domain_free_irqs(dev); + + return -EINVAL; +} +EXPORT_SYMBOL_GPL(pci_epc_generic_alloc_doorbell); + +/** + * pci_epc_generic_free_doorbell() - Common help function. Free resource created by + * pci_epc_generic_alloc_doorbell() + * + * @epc: the EPC device that need doorbell address and data from RC. + * @func_no: the physical endpoint function number in the EPC device. + * @vfunc_no: the virtual endpoint function number in the physical function. + * @num_msgs: the total number of doorbell messages + */ +void pci_epc_generic_free_doorbell(struct pci_epc *epc, u8 func_no, u8 vfunc_no) +{ + struct pci_epf *epf; + int i; + + epf = list_first_entry_or_null(&epc->pci_epf, struct pci_epf, list); + if (!epf) + return; + + for (i = 0; i < epf->num_msgs; i++) + kfree(free_irq(epf->virq_base + i, epf)); + + platform_msi_domain_free_irqs(epc->dev.parent); +} +EXPORT_SYMBOL_GPL(pci_epc_generic_free_doorbell); + /** * pci_epc_destroy() - destroy the EPC device * @epc: the EPC device that has to be destroyed diff --git a/drivers/pci/endpoint/pci-epf-core.c b/drivers/pci/endpoint/pci-epf-core.c index 2c32de6679377..eab82c6b0119a 100644 --- a/drivers/pci/endpoint/pci-epf-core.c +++ b/drivers/pci/endpoint/pci-epf-core.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include @@ -300,6 +301,49 @@ void *pci_epf_alloc_space(struct pci_epf *epf, size_t size, enum pci_barno bar, } EXPORT_SYMBOL_GPL(pci_epf_alloc_space); +int pci_epf_alloc_doorbell(struct pci_epf *epf, u16 num_msgs) +{ + struct pci_epc *epc; + struct device *dev; + int ret; + + epc = epf->epc; + dev = &epc->dev; + + epf->msg = kcalloc(num_msgs, sizeof(struct msi_msg), GFP_KERNEL); + if (!epf->msg) + return -ENOMEM; + + epf->num_msgs = num_msgs; + + ret = pci_epc_alloc_doorbell(epc, epf->func_no, epf->vfunc_no, num_msgs); + if (ret) + goto err_free_mem; + + return ret; + +err_free_mem: + kfree(epf->msg); + epf->msg = NULL; + epf->num_msgs = 0; + + return ret; +} +EXPORT_SYMBOL_GPL(pci_epf_alloc_doorbell); + +void pci_epf_free_doorbell(struct pci_epf *epf) +{ + struct pci_epc *epc; + + epc = epf->epc; + pci_epc_free_doorbell(epc, epf->func_no, epf->vfunc_no); + + kfree(epf->msg); + epf->msg = NULL; + epf->num_msgs = 0; +} +EXPORT_SYMBOL_GPL(pci_epf_free_doorbell); + static void pci_epf_remove_cfs(struct pci_epf_driver *driver) { struct config_group *group, *tmp; diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h index 5cb6940310729..605fb0debd6bc 100644 --- a/include/linux/pci-epc.h +++ b/include/linux/pci-epc.h @@ -88,6 +88,8 @@ struct pci_epc_ops { void (*stop)(struct pci_epc *epc); const struct pci_epc_features* (*get_features)(struct pci_epc *epc, u8 func_no, u8 vfunc_no); + int (*alloc_doorbell)(struct pci_epc *epc, u8 func_no, u8 vfunc_no, int num_msgs); + void (*free_doorbell)(struct pci_epc *epc, u8 func_no, u8 vfunc_no); struct module *owner; }; @@ -251,4 +253,8 @@ void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc, phys_addr_t *phys_addr, size_t size); void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr, void __iomem *virt_addr, size_t size); +int pci_epc_alloc_doorbell(struct pci_epc *epc, u8 func_no, u8 vfunc_no, int num_msgs); +void pci_epc_free_doorbell(struct pci_epc *epc, u8 func_no, u8 vfunc_no); +int pci_epc_generic_alloc_doorbell(struct pci_epc *epc, u8 func_no, u8 vfunc_no, int num_msgs); +void pci_epc_generic_free_doorbell(struct pci_epc *epc, u8 func_no, u8 vfunc_no); #endif /* __LINUX_PCI_EPC_H */ diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h index 3f44b6aec4770..485c146a5efe2 100644 --- a/include/linux/pci-epf.h +++ b/include/linux/pci-epf.h @@ -79,6 +79,7 @@ struct pci_epc_event_ops { int (*link_up)(struct pci_epf *epf); int (*link_down)(struct pci_epf *epf); int (*bme)(struct pci_epf *epf); + int (*doorbell)(struct pci_epf *epf, int index); }; /** @@ -180,6 +181,9 @@ struct pci_epf { unsigned long vfunction_num_map; struct list_head pci_vepf; const struct pci_epc_event_ops *event_ops; + struct msi_msg *msg; + u16 num_msgs; + int virq_base; }; /** @@ -223,4 +227,7 @@ int pci_epf_bind(struct pci_epf *epf); void pci_epf_unbind(struct pci_epf *epf); int pci_epf_add_vepf(struct pci_epf *epf_pf, struct pci_epf *epf_vf); void pci_epf_remove_vepf(struct pci_epf *epf_pf, struct pci_epf *epf_vf); +int pci_epf_alloc_doorbell(struct pci_epf *epf, u16 nums); +void pci_epf_free_doorbell(struct pci_epf *epf); + #endif /* __LINUX_PCI_EPF_H */