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 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         void    (*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  * @barno: BAR number
 106  * @flags: flags that are set for the BAR
 107  */
 108 struct pci_epf_bar {
 109         dma_addr_t      phys_addr;
 110         void            *addr;
 111         size_t          size;
 112         enum pci_barno  barno;
 113         int             flags;
 114 };
 115
 116 /**
 117  * struct pci_epf - represents the PCI EPF device
 118  * @dev: the PCI EPF device
 119  * @name: the name of the PCI EPF device
 120  * @header: represents standard configuration header
 121  * @bar: represents the BAR of EPF device
 122  * @msi_interrupts: number of MSI interrupts required by this function
 123  * @msix_interrupts: number of MSI-X interrupts required by this function
 124  * @func_no: unique (physical) function number within this endpoint device
 125  * @vfunc_no: unique virtual function number within a physical function
 126  * @epc: the EPC device to which this EPF device is bound
 127  * @epf_pf: the physical EPF device to which this virtual EPF device is bound
 128  * @driver: the EPF driver to which this EPF device is bound
 129  * @list: to add pci_epf as a list of PCI endpoint functions to pci_epc
 130  * @nb: notifier block to notify EPF of any EPC events (like linkup)
 131  * @lock: mutex to protect pci_epf_ops
 132  * @sec_epc: the secondary EPC device to which this EPF device is bound
 133  * @sec_epc_list: to add pci_epf as list of PCI endpoint functions to secondary
 134  *   EPC device
 135  * @sec_epc_bar: represents the BAR of EPF device associated with secondary EPC
 136  * @sec_epc_func_no: unique (physical) function number within the secondary EPC
 137  * @group: configfs group associated with the EPF device
 138  * @is_bound: indicates if bind notification to function driver has been invoked
 139  * @is_vf: true - virtual function, false - physical function
 140  * @vfunction_num_map: bitmap to manage virtual function number
 141  * @pci_vepf: list of virtual endpoint functions associated with this function
 142  */
 143 struct pci_epf {
 144         struct device           dev;
 145         const char              *name;
 146         struct pci_epf_header   *header;
 147         struct pci_epf_bar      bar[6];
 148         u8                      msi_interrupts;
 149         u16                     msix_interrupts;
 150         u8                      func_no;
 151         u8                      vfunc_no;
 152
 153         struct pci_epc          *epc;
 154         struct pci_epf          *epf_pf;
 155         struct pci_epf_driver   *driver;
 156         struct list_head        list;
 157         struct notifier_block   nb;
 158         /* mutex to protect against concurrent access of pci_epf_ops */
 159         struct mutex            lock;
 160
 161         /* Below members are to attach secondary EPC to an endpoint function */
 162         struct pci_epc          *sec_epc;
 163         struct list_head        sec_epc_list;
 164         struct pci_epf_bar      sec_epc_bar[6];
 165         u8                      sec_epc_func_no;
 166         struct config_group     *group;
 167         unsigned int            is_bound;
 168         unsigned int            is_vf;
 169         unsigned long           vfunction_num_map;
 170         struct list_head        pci_vepf;
 171 };
 172
 173 /**
 174  * struct pci_epf_msix_tbl - represents the MSIX table entry structure
 175  * @msg_addr: Writes to this address will trigger MSIX interrupt in host
 176  * @msg_data: Data that should be written to @msg_addr to trigger MSIX interrupt
 177  * @vector_ctrl: Identifies if the function is prohibited from sending a message
 178  * using this MSIX table entry
 179  */
 180 struct pci_epf_msix_tbl {
 181         u64 msg_addr;
 182         u32 msg_data;
 183         u32 vector_ctrl;
 184 };
 185
 186 #define to_pci_epf(epf_dev) container_of((epf_dev), struct pci_epf, dev)
 187
 188 #define pci_epf_register_driver(driver)    \
 189                 __pci_epf_register_driver((driver), THIS_MODULE)
 190
 191 static inline void epf_set_drvdata(struct pci_epf *epf, void *data)
 192 {
 193         dev_set_drvdata(&epf->dev, data);
 194 }
 195
 196 static inline void *epf_get_drvdata(struct pci_epf *epf)
 197 {
 198         return dev_get_drvdata(&epf->dev);
 199 }
 200
 201 struct pci_epf *pci_epf_create(const char *name);
 202 void pci_epf_destroy(struct pci_epf *epf);
 203 int __pci_epf_register_driver(struct pci_epf_driver *driver,
 204                               struct module *owner);
 205 void pci_epf_unregister_driver(struct pci_epf_driver *driver);
 206 void *pci_epf_alloc_space(struct pci_epf *epf, size_t size, enum pci_barno bar,
 207                           size_t align, enum pci_epc_interface_type type);
 208 void pci_epf_free_space(struct pci_epf *epf, void *addr, enum pci_barno bar,
 209                         enum pci_epc_interface_type type);
 210 int pci_epf_bind(struct pci_epf *epf);
 211 void pci_epf_unbind(struct pci_epf *epf);
 212 struct config_group *pci_epf_type_add_cfs(struct pci_epf *epf,
 213                                           struct config_group *group);
 214 int pci_epf_add_vepf(struct pci_epf *epf_pf, struct pci_epf *epf_vf);
 215 void pci_epf_remove_vepf(struct pci_epf *epf_pf, struct pci_epf *epf_vf);
 216 #endif /* __LINUX_PCI_EPF_H */