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X-Original-Sender: suravee.suthikulpanit@amd.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 209.85.217.169 as permitted sender) smtp.mailfrom=patch+caf_=patchwork-forward=linaro.org@linaro.org Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , This patch introduces an interface for irqchip to register a callback, to provide a way to determine appropriate MSI domain for a pci device. Signed-off-by: Suravee Suthikulpanit --- drivers/pci/msi.c | 30 ++++++++++++++++++++++++++++++ include/linux/msi.h | 7 +++++++ 2 files changed, 37 insertions(+) diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index ddd59fe..2c87843 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -1327,4 +1327,34 @@ struct irq_domain *pci_msi_create_default_irq_domain(struct fwnode_handle *fwnod return domain; } + +static struct fwnode_handle *(*pci_msi_get_fwnode_cb)(struct device *dev); + +/** + * pci_msi_register_fwnode_provider - Register callback to retrieve fwnode + * @fn: The interrupt domain to retrieve + * + * This should be called by irqchip driver, which is the parent of + * the MSI domain to provide callback interface to query fwnode. + */ +void +pci_msi_register_fwnode_provider(struct fwnode_handle *(*fn)(struct device *)) +{ + pci_msi_get_fwnode_cb = fn; +} + +/** + * pci_msi_get_fwnode - Query fwnode for MSI controller of the @dev + * @dev: The device that we try to query MSI domain token for + * + * This is used to query MSI domain token when setting up MSI domain + * for a device. Returns fwnode_handle * if token found / NULL if not found + */ +struct fwnode_handle *pci_msi_get_fwnode(struct device *dev) +{ + if (pci_msi_get_fwnode_cb) + return pci_msi_get_fwnode_cb(dev); + + return NULL; +} #endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */ diff --git a/include/linux/msi.h b/include/linux/msi.h index 32a24b9..ceaebf6 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -3,6 +3,7 @@ #include #include +#include struct msi_msg { u32 address_lo; /* low 32 bits of msi message address */ @@ -294,6 +295,12 @@ irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev, struct msi_desc *desc); int pci_msi_domain_check_cap(struct irq_domain *domain, struct msi_domain_info *info, struct device *dev); + +void +pci_msi_register_fwnode_provider(struct fwnode_handle *(*fn)(struct device *)); + +struct fwnode_handle *pci_msi_get_fwnode(struct device *dev); + #endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */ #endif /* LINUX_MSI_H */