diff options
| -rw-r--r-- | drivers/pci/endpoint/pci-epc-core.c | 41 | ||||
| -rw-r--r-- | include/linux/pci-epc.h | 8 |
2 files changed, 49 insertions, 0 deletions
diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c index 3693eca5b030..cc8f9eb2b177 100644 --- a/drivers/pci/endpoint/pci-epc-core.c +++ b/drivers/pci/endpoint/pci-epc-core.c @@ -231,6 +231,47 @@ int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no, EXPORT_SYMBOL_GPL(pci_epc_raise_irq); /** + * pci_epc_map_msi_irq() - Map physical address to MSI address and return + * MSI data + * @epc: the EPC device which has the MSI capability + * @func_no: the physical endpoint function number in the EPC device + * @phys_addr: the physical address of the outbound region + * @interrupt_num: the MSI interrupt number + * @entry_size: Size of Outbound address region for each interrupt + * @msi_data: the data that should be written in order to raise MSI interrupt + * with interrupt number as 'interrupt num' + * @msi_addr_offset: Offset of MSI address from the aligned outbound address + * to which the MSI address is mapped + * + * Invoke to map physical address to MSI address and return MSI data. The + * physical address should be an address in the outbound region. This is + * required to implement doorbell functionality of NTB wherein EPC on either + * side of the interface (primary and secondary) can directly write to the + * physical address (in outbound region) of the other interface to ring + * doorbell. + */ +int pci_epc_map_msi_irq(struct pci_epc *epc, u8 func_no, phys_addr_t phys_addr, + u8 interrupt_num, u32 entry_size, u32 *msi_data, + u32 *msi_addr_offset) +{ + int ret; + + if (IS_ERR_OR_NULL(epc)) + return -EINVAL; + + if (!epc->ops->map_msi_irq) + return -EINVAL; + + mutex_lock(&epc->lock); + ret = epc->ops->map_msi_irq(epc, func_no, phys_addr, interrupt_num, + entry_size, msi_data, msi_addr_offset); + mutex_unlock(&epc->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(pci_epc_map_msi_irq); + +/** * pci_epc_get_msi() - get the number of MSI interrupt numbers allocated * @epc: the EPC device to which MSI interrupts was requested * @func_no: the endpoint function number in the EPC device diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h index d9cb3944fb87..b82c9b100e97 100644 --- a/include/linux/pci-epc.h +++ b/include/linux/pci-epc.h @@ -55,6 +55,7 @@ pci_epc_interface_string(enum pci_epc_interface_type type) * @get_msix: ops to get the number of MSI-X interrupts allocated by the RC * from the MSI-X capability register * @raise_irq: ops to raise a legacy, MSI or MSI-X interrupt + * @map_msi_irq: ops to map physical address to MSI address and return MSI data * @start: ops to start the PCI link * @stop: ops to stop the PCI link * @owner: the module owner containing the ops @@ -77,6 +78,10 @@ struct pci_epc_ops { int (*get_msix)(struct pci_epc *epc, u8 func_no); int (*raise_irq)(struct pci_epc *epc, u8 func_no, enum pci_epc_irq_type type, u16 interrupt_num); + int (*map_msi_irq)(struct pci_epc *epc, u8 func_no, + phys_addr_t phys_addr, u8 interrupt_num, + u32 entry_size, u32 *msi_data, + u32 *msi_addr_offset); int (*start)(struct pci_epc *epc); void (*stop)(struct pci_epc *epc); const struct pci_epc_features* (*get_features)(struct pci_epc *epc, @@ -216,6 +221,9 @@ int pci_epc_get_msi(struct pci_epc *epc, u8 func_no); int pci_epc_set_msix(struct pci_epc *epc, u8 func_no, u16 interrupts, enum pci_barno, u32 offset); int pci_epc_get_msix(struct pci_epc *epc, u8 func_no); +int pci_epc_map_msi_irq(struct pci_epc *epc, u8 func_no, + phys_addr_t phys_addr, u8 interrupt_num, + u32 entry_size, u32 *msi_data, u32 *msi_addr_offset); int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no, enum pci_epc_irq_type type, u16 interrupt_num); int pci_epc_start(struct pci_epc *epc); |