include/linux/pci-epf.h

   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 <kishon@ti.com>
   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 struct pci_epc_features;
  19 enum pci_epc_interface_type;
  20
  21 enum pci_barno {
  22         NO_BAR = -1,
  23         BAR_0,
  24         BAR_1,
  25         BAR_2,
  26         BAR_3,
  27         BAR_4,
  28         BAR_5,
  29 };
  30
  31 /**
  32  * struct pci_epf_header - represents standard configuration header
  33  * @vendorid: identifies device manufacturer
  34  * @deviceid: identifies a particular device
  35  * @revid: specifies a device-specific revision identifier
  36  * @progif_code: identifies a specific register-level programming interface
  37  * @subclass_code: identifies more specifically the function of the device
  38  * @baseclass_code: broadly classifies the type of function the device performs
  39  * @cache_line_size: specifies the system cacheline size in units of DWORDs
  40  * @subsys_vendor_id: vendor of the add-in card or subsystem
  41  * @subsys_id: id specific to vendor
  42  * @interrupt_pin: interrupt pin the device (or device function) uses
  43  */
  44 struct pci_epf_header {
  45         u16     vendorid;
  46         u16     deviceid;
  47         u8      revid;
  48         u8      progif_code;
  49         u8      subclass_code;
  50         u8      baseclass_code;
  51         u8      cache_line_size;
  52         u16     subsys_vendor_id;
  53         u16     subsys_id;
  54         enum pci_interrupt_pin interrupt_pin;
  55 };
  56
  57 /**
  58  * struct pci_epf_ops - set of function pointers for performing EPF operations
  59  * @bind: ops to perform when a EPC device has been bound to EPF device
  60  * @unbind: ops to perform when a binding has been lost between a EPC device
  61  *          and EPF device
  62  * @add_cfs: ops to initialize function specific configfs attributes
  63  */
  64 struct pci_epf_ops {
  65         int     (*bind)(struct pci_epf *epf);
  66         void    (*unbind)(struct pci_epf *epf);
  67         struct config_group *(*add_cfs)(struct pci_epf *epf,
  68                                         struct config_group *group);
  69 };
  70
  71 /**
  72  * struct pci_epc_event_ops - Callbacks for capturing the EPC events
  73  * @epc_init: Callback for the EPC initialization complete event
  74  * @epc_deinit: Callback for the EPC deinitialization event
  75  * @link_up: Callback for the EPC link up event
  76  * @link_down: Callback for the EPC link down event
  77  * @bus_master_enable: Callback for the EPC Bus Master Enable event
  78  */
  79 struct pci_epc_event_ops {
  80         int (*epc_init)(struct pci_epf *epf);
  81         void (*epc_deinit)(struct pci_epf *epf);
  82         int (*link_up)(struct pci_epf *epf);
  83         int (*link_down)(struct pci_epf *epf);
  84         int (*bus_master_enable)(struct pci_epf *epf);
  85 };
  86
  87 /**
  88  * struct pci_epf_driver - represents the PCI EPF driver
  89  * @probe: ops to perform when a new EPF device has been bound to the EPF driver
  90  * @remove: ops to perform when the binding between the EPF device and EPF
  91  *          driver is broken
  92  * @driver: PCI EPF driver
  93  * @ops: set of function pointers for performing EPF operations
  94  * @owner: the owner of the module that registers the PCI EPF driver
  95  * @epf_group: list of configfs group corresponding to the PCI EPF driver
  96  * @id_table: identifies EPF devices for probing
  97  */
  98 struct pci_epf_driver {
  99         int     (*probe)(struct pci_epf *epf,
 100                          const struct pci_epf_device_id *id);
 101         void    (*remove)(struct pci_epf *epf);
 102
 103         struct device_driver    driver;
 104         const struct pci_epf_ops *ops;
 105         struct module           *owner;
 106         struct list_head        epf_group;
 107         const struct pci_epf_device_id  *id_table;
 108 };
 109
 110 #define to_pci_epf_driver(drv) container_of_const((drv), struct pci_epf_driver, driver)
 111
 112 /**
 113  * struct pci_epf_bar - represents the BAR of EPF device
 114  * @phys_addr: physical address that should be mapped to the BAR
 115  * @addr: virtual address corresponding to the @phys_addr
 116  * @size: the size of the address space present in BAR
 117  * @barno: BAR number
 118  * @flags: flags that are set for the BAR
 119  */
 120 struct pci_epf_bar {
 121         dma_addr_t      phys_addr;
 122         void            *addr;
 123         size_t          size;
 124         enum pci_barno  barno;
 125         int             flags;
 126 };
 127
 128 /**
 129  * struct pci_epf - represents the PCI EPF device
 130  * @dev: the PCI EPF device
 131  * @name: the name of the PCI EPF device
 132  * @header: represents standard configuration header
 133  * @bar: represents the BAR of EPF device
 134  * @msi_interrupts: number of MSI interrupts required by this function
 135  * @msix_interrupts: number of MSI-X interrupts required by this function
 136  * @func_no: unique (physical) function number within this endpoint device
 137  * @vfunc_no: unique virtual function number within a physical function
 138  * @epc: the EPC device to which this EPF device is bound
 139  * @epf_pf: the physical EPF device to which this virtual EPF device is bound
 140  * @driver: the EPF driver to which this EPF device is bound
 141  * @id: Pointer to the EPF device ID
 142  * @list: to add pci_epf as a list of PCI endpoint functions to pci_epc
 143  * @lock: mutex to protect pci_epf_ops
 144  * @sec_epc: the secondary EPC device to which this EPF device is bound
 145  * @sec_epc_list: to add pci_epf as list of PCI endpoint functions to secondary
 146  *   EPC device
 147  * @sec_epc_bar: represents the BAR of EPF device associated with secondary EPC
 148  * @sec_epc_func_no: unique (physical) function number within the secondary EPC
 149  * @group: configfs group associated with the EPF device
 150  * @is_bound: indicates if bind notification to function driver has been invoked
 151  * @is_vf: true - virtual function, false - physical function
 152  * @vfunction_num_map: bitmap to manage virtual function number
 153  * @pci_vepf: list of virtual endpoint functions associated with this function
 154  * @event_ops: Callbacks for capturing the EPC events
 155  */
 156 struct pci_epf {
 157         struct device           dev;
 158         const char              *name;
 159         struct pci_epf_header   *header;
 160         struct pci_epf_bar      bar[6];
 161         u8                      msi_interrupts;
 162         u16                     msix_interrupts;
 163         u8                      func_no;
 164         u8                      vfunc_no;
 165
 166         struct pci_epc          *epc;
 167         struct pci_epf          *epf_pf;
 168         struct pci_epf_driver   *driver;
 169         const struct pci_epf_device_id *id;
 170         struct list_head        list;
 171         /* mutex to protect against concurrent access of pci_epf_ops */
 172         struct mutex            lock;
 173
 174         /* Below members are to attach secondary EPC to an endpoint function */
 175         struct pci_epc          *sec_epc;
 176         struct list_head        sec_epc_list;
 177         struct pci_epf_bar      sec_epc_bar[6];
 178         u8                      sec_epc_func_no;
 179         struct config_group     *group;
 180         unsigned int            is_bound;
 181         unsigned int            is_vf;
 182         unsigned long           vfunction_num_map;
 183         struct list_head        pci_vepf;
 184         const struct pci_epc_event_ops *event_ops;
 185 };
 186
 187 /**
 188  * struct pci_epf_msix_tbl - represents the MSIX table entry structure
 189  * @msg_addr: Writes to this address will trigger MSIX interrupt in host
 190  * @msg_data: Data that should be written to @msg_addr to trigger MSIX interrupt
 191  * @vector_ctrl: Identifies if the function is prohibited from sending a message
 192  * using this MSIX table entry
 193  */
 194 struct pci_epf_msix_tbl {
 195         u64 msg_addr;
 196         u32 msg_data;
 197         u32 vector_ctrl;
 198 };
 199
 200 #define to_pci_epf(epf_dev) container_of((epf_dev), struct pci_epf, dev)
 201
 202 #define pci_epf_register_driver(driver)    \
 203                 __pci_epf_register_driver((driver), THIS_MODULE)
 204
 205 static inline void epf_set_drvdata(struct pci_epf *epf, void *data)
 206 {
 207         dev_set_drvdata(&epf->dev, data);
 208 }
 209
 210 static inline void *epf_get_drvdata(struct pci_epf *epf)
 211 {
 212         return dev_get_drvdata(&epf->dev);
 213 }
 214
 215 struct pci_epf *pci_epf_create(const char *name);
 216 void pci_epf_destroy(struct pci_epf *epf);
 217 int __pci_epf_register_driver(struct pci_epf_driver *driver,
 218                               struct module *owner);
 219 void pci_epf_unregister_driver(struct pci_epf_driver *driver);
 220 void *pci_epf_alloc_space(struct pci_epf *epf, size_t size, enum pci_barno bar,
 221                           const struct pci_epc_features *epc_features,
 222                           enum pci_epc_interface_type type);
 223 void pci_epf_free_space(struct pci_epf *epf, void *addr, enum pci_barno bar,
 224                         enum pci_epc_interface_type type);
 225 int pci_epf_bind(struct pci_epf *epf);
 226 void pci_epf_unbind(struct pci_epf *epf);
 227 int pci_epf_add_vepf(struct pci_epf *epf_pf, struct pci_epf *epf_vf);
 228 void pci_epf_remove_vepf(struct pci_epf *epf_pf, struct pci_epf *epf_vf);
 229 #endif /* __LINUX_PCI_EPF_H */