1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /** 3 * PCI Endpoint *Function* (EPF) header file 4 * 5 * Copyright (C) 2017 Texas Instruments 6 * Author: Kishon Vijay Abraham I <[email protected]> 7 */ 8 9 #ifndef __LINUX_PCI_EPF_H 10 #define __LINUX_PCI_EPF_H 11 12 #include <linux/configfs.h> 13 #include <linux/device.h> 14 #include <linux/mod_devicetable.h> 15 #include <linux/pci.h> 16 17 struct pci_epf; 18 enum pci_epc_interface_type; 19 20 enum pci_notify_event { 21 CORE_INIT, 22 LINK_UP, 23 }; 24 25 enum pci_barno { 26 NO_BAR = -1, 27 BAR_0, 28 BAR_1, 29 BAR_2, 30 BAR_3, 31 BAR_4, 32 BAR_5, 33 }; 34 35 /** 36 * struct pci_epf_header - represents standard configuration header 37 * @vendorid: identifies device manufacturer 38 * @deviceid: identifies a particular device 39 * @revid: specifies a device-specific revision identifier 40 * @progif_code: identifies a specific register-level programming interface 41 * @subclass_code: identifies more specifically the function of the device 42 * @baseclass_code: broadly classifies the type of function the device performs 43 * @cache_line_size: specifies the system cacheline size in units of DWORDs 44 * @subsys_vendor_id: vendor of the add-in card or subsystem 45 * @subsys_id: id specific to vendor 46 * @interrupt_pin: interrupt pin the device (or device function) uses 47 */ 48 struct pci_epf_header { 49 u16 vendorid; 50 u16 deviceid; 51 u8 revid; 52 u8 progif_code; 53 u8 subclass_code; 54 u8 baseclass_code; 55 u8 cache_line_size; 56 u16 subsys_vendor_id; 57 u16 subsys_id; 58 enum pci_interrupt_pin interrupt_pin; 59 }; 60 61 /** 62 * struct pci_epf_ops - set of function pointers for performing EPF operations 63 * @bind: ops to perform when a EPC device has been bound to EPF device 64 * @unbind: ops to perform when a binding has been lost between a EPC device 65 * and EPF device 66 * @add_cfs: ops to initialize function specific configfs attributes 67 */ 68 struct pci_epf_ops { 69 int (*bind)(struct pci_epf *epf); 70 void (*unbind)(struct pci_epf *epf); 71 struct config_group *(*add_cfs)(struct pci_epf *epf, 72 struct config_group *group); 73 }; 74 75 /** 76 * struct pci_epf_driver - represents the PCI EPF driver 77 * @probe: ops to perform when a new EPF device has been bound to the EPF driver 78 * @remove: ops to perform when the binding between the EPF device and EPF 79 * driver is broken 80 * @driver: PCI EPF driver 81 * @ops: set of function pointers for performing EPF operations 82 * @owner: the owner of the module that registers the PCI EPF driver 83 * @epf_group: list of configfs group corresponding to the PCI EPF driver 84 * @id_table: identifies EPF devices for probing 85 */ 86 struct pci_epf_driver { 87 int (*probe)(struct pci_epf *epf); 88 int (*remove)(struct pci_epf *epf); 89 90 struct device_driver driver; 91 struct pci_epf_ops *ops; 92 struct module *owner; 93 struct list_head epf_group; 94 const struct pci_epf_device_id *id_table; 95 }; 96 97 #define to_pci_epf_driver(drv) (container_of((drv), struct pci_epf_driver, \ 98 driver)) 99 100 /** 101 * struct pci_epf_bar - represents the BAR of EPF device 102 * @phys_addr: physical address that should be mapped to the BAR 103 * @addr: virtual address corresponding to the @phys_addr 104 * @size: the size of the address space present in BAR 105 */ 106 struct pci_epf_bar { 107 dma_addr_t phys_addr; 108 void *addr; 109 size_t size; 110 enum pci_barno barno; 111 int flags; 112 }; 113 114 /** 115 * struct pci_epf - represents the PCI EPF device 116 * @dev: the PCI EPF device 117 * @name: the name of the PCI EPF device 118 * @header: represents standard configuration header 119 * @bar: represents the BAR of EPF device 120 * @msi_interrupts: number of MSI interrupts required by this function 121 * @func_no: unique function number within this endpoint device 122 * @epc: the EPC device to which this EPF device is bound 123 * @driver: the EPF driver to which this EPF device is bound 124 * @list: to add pci_epf as a list of PCI endpoint functions to pci_epc 125 * @nb: notifier block to notify EPF of any EPC events (like linkup) 126 * @lock: mutex to protect pci_epf_ops 127 * @sec_epc: the secondary EPC device to which this EPF device is bound 128 * @sec_epc_list: to add pci_epf as list of PCI endpoint functions to secondary 129 * EPC device 130 * @sec_epc_bar: represents the BAR of EPF device associated with secondary EPC 131 * @sec_epc_func_no: unique (physical) function number within the secondary EPC 132 * @group: configfs group associated with the EPF device 133 */ 134 struct pci_epf { 135 struct device dev; 136 const char *name; 137 struct pci_epf_header *header; 138 struct pci_epf_bar bar[6]; 139 u8 msi_interrupts; 140 u16 msix_interrupts; 141 u8 func_no; 142 143 struct pci_epc *epc; 144 struct pci_epf_driver *driver; 145 struct list_head list; 146 struct notifier_block nb; 147 /* mutex to protect against concurrent access of pci_epf_ops */ 148 struct mutex lock; 149 150 /* Below members are to attach secondary EPC to an endpoint function */ 151 struct pci_epc *sec_epc; 152 struct list_head sec_epc_list; 153 struct pci_epf_bar sec_epc_bar[6]; 154 u8 sec_epc_func_no; 155 struct config_group *group; 156 }; 157 158 /** 159 * struct pci_epf_msix_tbl - represents the MSIX table entry structure 160 * @msg_addr: Writes to this address will trigger MSIX interrupt in host 161 * @msg_data: Data that should be written to @msg_addr to trigger MSIX interrupt 162 * @vector_ctrl: Identifies if the function is prohibited from sending a message 163 * using this MSIX table entry 164 */ 165 struct pci_epf_msix_tbl { 166 u64 msg_addr; 167 u32 msg_data; 168 u32 vector_ctrl; 169 }; 170 171 #define to_pci_epf(epf_dev) container_of((epf_dev), struct pci_epf, dev) 172 173 #define pci_epf_register_driver(driver) \ 174 __pci_epf_register_driver((driver), THIS_MODULE) 175 176 static inline void epf_set_drvdata(struct pci_epf *epf, void *data) 177 { 178 dev_set_drvdata(&epf->dev, data); 179 } 180 181 static inline void *epf_get_drvdata(struct pci_epf *epf) 182 { 183 return dev_get_drvdata(&epf->dev); 184 } 185 186 struct pci_epf *pci_epf_create(const char *name); 187 void pci_epf_destroy(struct pci_epf *epf); 188 int __pci_epf_register_driver(struct pci_epf_driver *driver, 189 struct module *owner); 190 void pci_epf_unregister_driver(struct pci_epf_driver *driver); 191 void *pci_epf_alloc_space(struct pci_epf *epf, size_t size, enum pci_barno bar, 192 size_t align, enum pci_epc_interface_type type); 193 void pci_epf_free_space(struct pci_epf *epf, void *addr, enum pci_barno bar, 194 enum pci_epc_interface_type type); 195 int pci_epf_bind(struct pci_epf *epf); 196 void pci_epf_unbind(struct pci_epf *epf); 197 struct config_group *pci_epf_type_add_cfs(struct pci_epf *epf, 198 struct config_group *group); 199 #endif /* __LINUX_PCI_EPF_H */ 200