drivers/pci/pci.h

   1 #ifndef DRIVERS_PCI_H
   2 #define DRIVERS_PCI_H
   3
   4 #define PCI_FIND_CAP_TTL        48
   5
   6 extern const unsigned char pcie_link_speed[];
   7
   8 bool pcie_cap_has_lnkctl(const struct pci_dev *dev);
   9
  10 /* Functions internal to the PCI core code */
  11
  12 int pci_create_sysfs_dev_files(struct pci_dev *pdev);
  13 void pci_remove_sysfs_dev_files(struct pci_dev *pdev);
  14 #if !defined(CONFIG_DMI) && !defined(CONFIG_ACPI)
  15 static inline void pci_create_firmware_label_files(struct pci_dev *pdev)
  16 { return; }
  17 static inline void pci_remove_firmware_label_files(struct pci_dev *pdev)
  18 { return; }
  19 #else
  20 void pci_create_firmware_label_files(struct pci_dev *pdev);
  21 void pci_remove_firmware_label_files(struct pci_dev *pdev);
  22 #endif
  23 void pci_cleanup_rom(struct pci_dev *dev);
  24 #ifdef HAVE_PCI_MMAP
  25 enum pci_mmap_api {
  26         PCI_MMAP_SYSFS, /* mmap on /sys/bus/pci/devices/<BDF>/resource<N> */
  27         PCI_MMAP_PROCFS /* mmap on /proc/bus/pci/<BDF> */
  28 };
  29 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vmai,
  30                   enum pci_mmap_api mmap_api);
  31 #endif
  32 int pci_probe_reset_function(struct pci_dev *dev);
  33
  34 /**
  35  * struct pci_platform_pm_ops - Firmware PM callbacks
  36  *
  37  * @is_manageable: returns 'true' if given device is power manageable by the
  38  *                 platform firmware
  39  *
  40  * @set_state: invokes the platform firmware to set the device's power state
  41  *
  42  * @get_state: queries the platform firmware for a device's current power state
  43  *
  44  * @choose_state: returns PCI power state of given device preferred by the
  45  *                platform; to be used during system-wide transitions from a
  46  *                sleeping state to the working state and vice versa
  47  *
  48  * @sleep_wake: enables/disables the system wake up capability of given device
  49  *
  50  * @run_wake: enables/disables the platform to generate run-time wake-up events
  51  *              for given device (the device's wake-up capability has to be
  52  *              enabled by @sleep_wake for this feature to work)
  53  *
  54  * @need_resume: returns 'true' if the given device (which is currently
  55  *              suspended) needs to be resumed to be configured for system
  56  *              wakeup.
  57  *
  58  * If given platform is generally capable of power managing PCI devices, all of
  59  * these callbacks are mandatory.
  60  */
  61 struct pci_platform_pm_ops {
  62         bool (*is_manageable)(struct pci_dev *dev);
  63         int (*set_state)(struct pci_dev *dev, pci_power_t state);
  64         pci_power_t (*get_state)(struct pci_dev *dev);
  65         pci_power_t (*choose_state)(struct pci_dev *dev);
  66         int (*sleep_wake)(struct pci_dev *dev, bool enable);
  67         int (*run_wake)(struct pci_dev *dev, bool enable);
  68         bool (*need_resume)(struct pci_dev *dev);
  69 };
  70
  71 int pci_set_platform_pm(const struct pci_platform_pm_ops *ops);
  72 void pci_update_current_state(struct pci_dev *dev, pci_power_t state);
  73 void pci_power_up(struct pci_dev *dev);
  74 void pci_disable_enabled_device(struct pci_dev *dev);
  75 int pci_finish_runtime_suspend(struct pci_dev *dev);
  76 int __pci_pme_wakeup(struct pci_dev *dev, void *ign);
  77 bool pci_dev_keep_suspended(struct pci_dev *dev);
  78 void pci_dev_complete_resume(struct pci_dev *pci_dev);
  79 void pci_config_pm_runtime_get(struct pci_dev *dev);
  80 void pci_config_pm_runtime_put(struct pci_dev *dev);
  81 void pci_pm_init(struct pci_dev *dev);
  82 void pci_ea_init(struct pci_dev *dev);
  83 void pci_allocate_cap_save_buffers(struct pci_dev *dev);
  84 void pci_free_cap_save_buffers(struct pci_dev *dev);
  85 bool pci_bridge_d3_possible(struct pci_dev *dev);
  86 void pci_bridge_d3_update(struct pci_dev *dev);
  87
  88 static inline void pci_wakeup_event(struct pci_dev *dev)
  89 {
  90         /* Wait 100 ms before the system can be put into a sleep state. */
  91         pm_wakeup_event(&dev->dev, 100);
  92 }
  93
  94 static inline bool pci_has_subordinate(struct pci_dev *pci_dev)
  95 {
  96         return !!(pci_dev->subordinate);
  97 }
  98
  99 static inline bool pci_power_manageable(struct pci_dev *pci_dev)
 100 {
 101         /*
 102          * Currently we allow normal PCI devices and PCI bridges transition
 103          * into D3 if their bridge_d3 is set.
 104          */
 105         return !pci_has_subordinate(pci_dev) || pci_dev->bridge_d3;
 106 }
 107
 108 struct pci_vpd_ops {
 109         ssize_t (*read)(struct pci_dev *dev, loff_t pos, size_t count, void *buf);
 110         ssize_t (*write)(struct pci_dev *dev, loff_t pos, size_t count, const void *buf);
 111         int (*set_size)(struct pci_dev *dev, size_t len);
 112 };
 113
 114 struct pci_vpd {
 115         const struct pci_vpd_ops *ops;
 116         struct bin_attribute *attr; /* descriptor for sysfs VPD entry */
 117         struct mutex    lock;
 118         unsigned int    len;
 119         u16             flag;
 120         u8              cap;
 121         u8              busy:1;
 122         u8              valid:1;
 123 };
 124
 125 int pci_vpd_init(struct pci_dev *dev);
 126 void pci_vpd_release(struct pci_dev *dev);
 127
 128 /* PCI /proc functions */
 129 #ifdef CONFIG_PROC_FS
 130 int pci_proc_attach_device(struct pci_dev *dev);
 131 int pci_proc_detach_device(struct pci_dev *dev);
 132 int pci_proc_detach_bus(struct pci_bus *bus);
 133 #else
 134 static inline int pci_proc_attach_device(struct pci_dev *dev) { return 0; }
 135 static inline int pci_proc_detach_device(struct pci_dev *dev) { return 0; }
 136 static inline int pci_proc_detach_bus(struct pci_bus *bus) { return 0; }
 137 #endif
 138
 139 /* Functions for PCI Hotplug drivers to use */
 140 int pci_hp_add_bridge(struct pci_dev *dev);
 141
 142 #ifdef HAVE_PCI_LEGACY
 143 void pci_create_legacy_files(struct pci_bus *bus);
 144 void pci_remove_legacy_files(struct pci_bus *bus);
 145 #else
 146 static inline void pci_create_legacy_files(struct pci_bus *bus) { return; }
 147 static inline void pci_remove_legacy_files(struct pci_bus *bus) { return; }
 148 #endif
 149
 150 /* Lock for read/write access to pci device and bus lists */
 151 extern struct rw_semaphore pci_bus_sem;
 152
 153 extern raw_spinlock_t pci_lock;
 154
 155 extern unsigned int pci_pm_d3_delay;
 156
 157 #ifdef CONFIG_PCI_MSI
 158 void pci_no_msi(void);
 159 #else
 160 static inline void pci_no_msi(void) { }
 161 #endif
 162
 163 static inline void pci_msi_set_enable(struct pci_dev *dev, int enable)
 164 {
 165         u16 control;
 166
 167         pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
 168         control &= ~PCI_MSI_FLAGS_ENABLE;
 169         if (enable)
 170                 control |= PCI_MSI_FLAGS_ENABLE;
 171         pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, control);
 172 }
 173
 174 static inline void pci_msix_clear_and_set_ctrl(struct pci_dev *dev, u16 clear, u16 set)
 175 {
 176         u16 ctrl;
 177
 178         pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &ctrl);
 179         ctrl &= ~clear;
 180         ctrl |= set;
 181         pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, ctrl);
 182 }
 183
 184 void pci_realloc_get_opt(char *);
 185
 186 static inline int pci_no_d1d2(struct pci_dev *dev)
 187 {
 188         unsigned int parent_dstates = 0;
 189
 190         if (dev->bus->self)
 191                 parent_dstates = dev->bus->self->no_d1d2;
 192         return (dev->no_d1d2 || parent_dstates);
 193
 194 }
 195 extern const struct attribute_group *pci_dev_groups[];
 196 extern const struct attribute_group *pcibus_groups[];
 197 extern struct device_type pci_dev_type;
 198 extern const struct attribute_group *pci_bus_groups[];
 199
 200
 201 /**
 202  * pci_match_one_device - Tell if a PCI device structure has a matching
 203  *                        PCI device id structure
 204  * @id: single PCI device id structure to match
 205  * @dev: the PCI device structure to match against
 206  *
 207  * Returns the matching pci_device_id structure or %NULL if there is no match.
 208  */
 209 static inline const struct pci_device_id *
 210 pci_match_one_device(const struct pci_device_id *id, const struct pci_dev *dev)
 211 {
 212         if ((id->vendor == PCI_ANY_ID || id->vendor == dev->vendor) &&
 213             (id->device == PCI_ANY_ID || id->device == dev->device) &&
 214             (id->subvendor == PCI_ANY_ID || id->subvendor == dev->subsystem_vendor) &&
 215             (id->subdevice == PCI_ANY_ID || id->subdevice == dev->subsystem_device) &&
 216             !((id->class ^ dev->class) & id->class_mask))
 217                 return id;
 218         return NULL;
 219 }
 220
 221 /* PCI slot sysfs helper code */
 222 #define to_pci_slot(s) container_of(s, struct pci_slot, kobj)
 223
 224 extern struct kset *pci_slots_kset;
 225
 226 struct pci_slot_attribute {
 227         struct attribute attr;
 228         ssize_t (*show)(struct pci_slot *, char *);
 229         ssize_t (*store)(struct pci_slot *, const char *, size_t);
 230 };
 231 #define to_pci_slot_attr(s) container_of(s, struct pci_slot_attribute, attr)
 232
 233 enum pci_bar_type {
 234         pci_bar_unknown,        /* Standard PCI BAR probe */
 235         pci_bar_io,             /* An io port BAR */
 236         pci_bar_mem32,          /* A 32-bit memory BAR */
 237         pci_bar_mem64,          /* A 64-bit memory BAR */
 238 };
 239
 240 bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *pl,
 241                                 int crs_timeout);
 242 int pci_setup_device(struct pci_dev *dev);
 243 int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
 244                     struct resource *res, unsigned int reg);
 245 void pci_configure_ari(struct pci_dev *dev);
 246 void __pci_bus_size_bridges(struct pci_bus *bus,
 247                         struct list_head *realloc_head);
 248 void __pci_bus_assign_resources(const struct pci_bus *bus,
 249                                 struct list_head *realloc_head,
 250                                 struct list_head *fail_head);
 251 bool pci_bus_clip_resource(struct pci_dev *dev, int idx);
 252
 253 void pci_reassigndev_resource_alignment(struct pci_dev *dev);
 254 void pci_disable_bridge_window(struct pci_dev *dev);
 255
 256 /* Single Root I/O Virtualization */
 257 struct pci_sriov {
 258         int pos;                /* capability position */
 259         int nres;               /* number of resources */
 260         u32 cap;                /* SR-IOV Capabilities */
 261         u16 ctrl;               /* SR-IOV Control */
 262         u16 total_VFs;          /* total VFs associated with the PF */
 263         u16 initial_VFs;        /* initial VFs associated with the PF */
 264         u16 num_VFs;            /* number of VFs available */
 265         u16 offset;             /* first VF Routing ID offset */
 266         u16 stride;             /* following VF stride */
 267         u32 pgsz;               /* page size for BAR alignment */
 268         u8 link;                /* Function Dependency Link */
 269         u8 max_VF_buses;        /* max buses consumed by VFs */
 270         u16 driver_max_VFs;     /* max num VFs driver supports */
 271         struct pci_dev *dev;    /* lowest numbered PF */
 272         struct pci_dev *self;   /* this PF */
 273         struct mutex lock;      /* lock for setting sriov_numvfs in sysfs */
 274         resource_size_t barsz[PCI_SRIOV_NUM_BARS];      /* VF BAR size */
 275 };
 276
 277 #ifdef CONFIG_PCI_ATS
 278 void pci_restore_ats_state(struct pci_dev *dev);
 279 #else
 280 static inline void pci_restore_ats_state(struct pci_dev *dev)
 281 {
 282 }
 283 #endif /* CONFIG_PCI_ATS */
 284
 285 #ifdef CONFIG_PCI_IOV
 286 int pci_iov_init(struct pci_dev *dev);
 287 void pci_iov_release(struct pci_dev *dev);
 288 void pci_iov_update_resource(struct pci_dev *dev, int resno);
 289 resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno);
 290 void pci_restore_iov_state(struct pci_dev *dev);
 291 int pci_iov_bus_range(struct pci_bus *bus);
 292
 293 #else
 294 static inline int pci_iov_init(struct pci_dev *dev)
 295 {
 296         return -ENODEV;
 297 }
 298 static inline void pci_iov_release(struct pci_dev *dev)
 299
 300 {
 301 }
 302 static inline void pci_restore_iov_state(struct pci_dev *dev)
 303 {
 304 }
 305 static inline int pci_iov_bus_range(struct pci_bus *bus)
 306 {
 307         return 0;
 308 }
 309
 310 #endif /* CONFIG_PCI_IOV */
 311
 312 unsigned long pci_cardbus_resource_alignment(struct resource *);
 313
 314 static inline resource_size_t pci_resource_alignment(struct pci_dev *dev,
 315                                                      struct resource *res)
 316 {
 317 #ifdef CONFIG_PCI_IOV
 318         int resno = res - dev->resource;
 319
 320         if (resno >= PCI_IOV_RESOURCES && resno <= PCI_IOV_RESOURCE_END)
 321                 return pci_sriov_resource_alignment(dev, resno);
 322 #endif
 323         if (dev->class >> 8  == PCI_CLASS_BRIDGE_CARDBUS)
 324                 return pci_cardbus_resource_alignment(res);
 325         return resource_alignment(res);
 326 }
 327
 328 void pci_enable_acs(struct pci_dev *dev);
 329
 330 #ifdef CONFIG_PCIE_PTM
 331 void pci_ptm_init(struct pci_dev *dev);
 332 #else
 333 static inline void pci_ptm_init(struct pci_dev *dev) { }
 334 #endif
 335
 336 struct pci_dev_reset_methods {
 337         u16 vendor;
 338         u16 device;
 339         int (*reset)(struct pci_dev *dev, int probe);
 340 };
 341
 342 #ifdef CONFIG_PCI_QUIRKS
 343 int pci_dev_specific_reset(struct pci_dev *dev, int probe);
 344 #else
 345 static inline int pci_dev_specific_reset(struct pci_dev *dev, int probe)
 346 {
 347         return -ENOTTY;
 348 }
 349 #endif
 350
 351 #if defined(CONFIG_PCI_QUIRKS) && defined(CONFIG_ARM64)
 352 int acpi_get_rc_resources(struct device *dev, const char *hid, u16 segment,
 353                           struct resource *res);
 354 #endif
 355
 356 #endif /* DRIVERS_PCI_H */