200 lines
6.2 KiB
C
200 lines
6.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/**
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* PCI Endpoint *Function* (EPF) header file
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*
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* Copyright (C) 2017 Texas Instruments
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* Author: Kishon Vijay Abraham I <kishon@ti.com>
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*/
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#ifndef __LINUX_PCI_EPF_H
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#define __LINUX_PCI_EPF_H
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#include <linux/configfs.h>
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#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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#include <linux/pci.h>
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struct pci_epf;
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enum pci_epc_interface_type;
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enum pci_notify_event {
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CORE_INIT,
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LINK_UP,
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};
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enum pci_barno {
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NO_BAR = -1,
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BAR_0,
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BAR_1,
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BAR_2,
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BAR_3,
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BAR_4,
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BAR_5,
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};
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/**
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* struct pci_epf_header - represents standard configuration header
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* @vendorid: identifies device manufacturer
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* @deviceid: identifies a particular device
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* @revid: specifies a device-specific revision identifier
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* @progif_code: identifies a specific register-level programming interface
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* @subclass_code: identifies more specifically the function of the device
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* @baseclass_code: broadly classifies the type of function the device performs
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* @cache_line_size: specifies the system cacheline size in units of DWORDs
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* @subsys_vendor_id: vendor of the add-in card or subsystem
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* @subsys_id: id specific to vendor
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* @interrupt_pin: interrupt pin the device (or device function) uses
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*/
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struct pci_epf_header {
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u16 vendorid;
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u16 deviceid;
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u8 revid;
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u8 progif_code;
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u8 subclass_code;
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u8 baseclass_code;
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u8 cache_line_size;
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u16 subsys_vendor_id;
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u16 subsys_id;
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enum pci_interrupt_pin interrupt_pin;
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};
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/**
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* struct pci_epf_ops - set of function pointers for performing EPF operations
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* @bind: ops to perform when a EPC device has been bound to EPF device
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* @unbind: ops to perform when a binding has been lost between a EPC device
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* and EPF device
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* @add_cfs: ops to initialize function specific configfs attributes
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*/
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struct pci_epf_ops {
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int (*bind)(struct pci_epf *epf);
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void (*unbind)(struct pci_epf *epf);
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struct config_group *(*add_cfs)(struct pci_epf *epf,
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struct config_group *group);
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};
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/**
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* struct pci_epf_driver - represents the PCI EPF driver
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* @probe: ops to perform when a new EPF device has been bound to the EPF driver
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* @remove: ops to perform when the binding between the EPF device and EPF
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* driver is broken
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* @driver: PCI EPF driver
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* @ops: set of function pointers for performing EPF operations
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* @owner: the owner of the module that registers the PCI EPF driver
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* @epf_group: list of configfs group corresponding to the PCI EPF driver
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* @id_table: identifies EPF devices for probing
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*/
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struct pci_epf_driver {
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int (*probe)(struct pci_epf *epf);
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int (*remove)(struct pci_epf *epf);
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struct device_driver driver;
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struct pci_epf_ops *ops;
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struct module *owner;
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struct list_head epf_group;
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const struct pci_epf_device_id *id_table;
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};
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#define to_pci_epf_driver(drv) (container_of((drv), struct pci_epf_driver, \
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driver))
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/**
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* struct pci_epf_bar - represents the BAR of EPF device
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* @phys_addr: physical address that should be mapped to the BAR
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* @addr: virtual address corresponding to the @phys_addr
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* @size: the size of the address space present in BAR
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*/
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struct pci_epf_bar {
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dma_addr_t phys_addr;
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void *addr;
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size_t size;
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enum pci_barno barno;
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int flags;
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};
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/**
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* struct pci_epf - represents the PCI EPF device
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* @dev: the PCI EPF device
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* @name: the name of the PCI EPF device
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* @header: represents standard configuration header
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* @bar: represents the BAR of EPF device
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* @msi_interrupts: number of MSI interrupts required by this function
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* @func_no: unique function number within this endpoint device
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* @epc: the EPC device to which this EPF device is bound
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* @driver: the EPF driver to which this EPF device is bound
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* @list: to add pci_epf as a list of PCI endpoint functions to pci_epc
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* @nb: notifier block to notify EPF of any EPC events (like linkup)
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* @lock: mutex to protect pci_epf_ops
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* @sec_epc: the secondary EPC device to which this EPF device is bound
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* @sec_epc_list: to add pci_epf as list of PCI endpoint functions to secondary
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* EPC device
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* @sec_epc_bar: represents the BAR of EPF device associated with secondary EPC
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* @sec_epc_func_no: unique (physical) function number within the secondary EPC
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* @group: configfs group associated with the EPF device
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*/
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struct pci_epf {
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struct device dev;
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const char *name;
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struct pci_epf_header *header;
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struct pci_epf_bar bar[6];
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u8 msi_interrupts;
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u16 msix_interrupts;
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u8 func_no;
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struct pci_epc *epc;
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struct pci_epf_driver *driver;
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struct list_head list;
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struct notifier_block nb;
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/* mutex to protect against concurrent access of pci_epf_ops */
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struct mutex lock;
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/* Below members are to attach secondary EPC to an endpoint function */
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struct pci_epc *sec_epc;
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struct list_head sec_epc_list;
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struct pci_epf_bar sec_epc_bar[6];
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u8 sec_epc_func_no;
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struct config_group *group;
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};
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/**
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* struct pci_epf_msix_tbl - represents the MSIX table entry structure
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* @msg_addr: Writes to this address will trigger MSIX interrupt in host
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* @msg_data: Data that should be written to @msg_addr to trigger MSIX interrupt
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* @vector_ctrl: Identifies if the function is prohibited from sending a message
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* using this MSIX table entry
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*/
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struct pci_epf_msix_tbl {
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u64 msg_addr;
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u32 msg_data;
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u32 vector_ctrl;
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};
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#define to_pci_epf(epf_dev) container_of((epf_dev), struct pci_epf, dev)
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#define pci_epf_register_driver(driver) \
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__pci_epf_register_driver((driver), THIS_MODULE)
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static inline void epf_set_drvdata(struct pci_epf *epf, void *data)
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{
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dev_set_drvdata(&epf->dev, data);
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}
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static inline void *epf_get_drvdata(struct pci_epf *epf)
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{
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return dev_get_drvdata(&epf->dev);
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}
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struct pci_epf *pci_epf_create(const char *name);
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void pci_epf_destroy(struct pci_epf *epf);
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int __pci_epf_register_driver(struct pci_epf_driver *driver,
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struct module *owner);
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void pci_epf_unregister_driver(struct pci_epf_driver *driver);
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void *pci_epf_alloc_space(struct pci_epf *epf, size_t size, enum pci_barno bar,
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size_t align, enum pci_epc_interface_type type);
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void pci_epf_free_space(struct pci_epf *epf, void *addr, enum pci_barno bar,
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enum pci_epc_interface_type type);
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int pci_epf_bind(struct pci_epf *epf);
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void pci_epf_unbind(struct pci_epf *epf);
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struct config_group *pci_epf_type_add_cfs(struct pci_epf *epf,
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struct config_group *group);
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#endif /* __LINUX_PCI_EPF_H */
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