drivers/pci/pci.h

   1 #ifndef DRIVERS_PCI_H
   2 #define DRIVERS_PCI_H
   3
   4 #define PCI_FIND_CAP_TTL        48
   5
   6 #define PCI_VSEC_ID_INTEL_TBT   0x1234  /* Thunderbolt */
   7
   8 extern const unsigned char pcie_link_speed[];
   9
  10 bool pcie_cap_has_lnkctl(const struct pci_dev *dev);
  11
  12 /* Functions internal to the PCI core code */
  13
  14 int pci_create_sysfs_dev_files(struct pci_dev *pdev);
  15 void pci_remove_sysfs_dev_files(struct pci_dev *pdev);
  16 #if !defined(CONFIG_DMI) && !defined(CONFIG_ACPI)
  17 static inline void pci_create_firmware_label_files(struct pci_dev *pdev)
  18 { return; }
  19 static inline void pci_remove_firmware_label_files(struct pci_dev *pdev)
  20 { return; }
  21 #else
  22 void pci_create_firmware_label_files(struct pci_dev *pdev);
  23 void pci_remove_firmware_label_files(struct pci_dev *pdev);
  24 #endif
  25 void pci_cleanup_rom(struct pci_dev *dev);
  26
  27 enum pci_mmap_api {
  28         PCI_MMAP_SYSFS, /* mmap on /sys/bus/pci/devices/<BDF>/resource<N> */
  29         PCI_MMAP_PROCFS /* mmap on /proc/bus/pci/<BDF> */
  30 };
  31 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vmai,
  32                   enum pci_mmap_api mmap_api);
  33
  34 int pci_probe_reset_function(struct pci_dev *dev);
  35
  36 /**
  37  * struct pci_platform_pm_ops - Firmware PM callbacks
  38  *
  39  * @is_manageable: returns 'true' if given device is power manageable by the
  40  *                 platform firmware
  41  *
  42  * @set_state: invokes the platform firmware to set the device's power state
  43  *
  44  * @get_state: queries the platform firmware for a device's current power state
  45  *
  46  * @choose_state: returns PCI power state of given device preferred by the
  47  *                platform; to be used during system-wide transitions from a
  48  *                sleeping state to the working state and vice versa
  49  *
  50  * @sleep_wake: enables/disables the system wake up capability of given device
  51  *
  52  * @run_wake: enables/disables the platform to generate run-time wake-up events
  53  *              for given device (the device's wake-up capability has to be
  54  *              enabled by @sleep_wake for this feature to work)
  55  *
  56  * @need_resume: returns 'true' if the given device (which is currently
  57  *              suspended) needs to be resumed to be configured for system
  58  *              wakeup.
  59  *
  60  * If given platform is generally capable of power managing PCI devices, all of
  61  * these callbacks are mandatory.
  62  */
  63 struct pci_platform_pm_ops {
  64         bool (*is_manageable)(struct pci_dev *dev);
  65         int (*set_state)(struct pci_dev *dev, pci_power_t state);
  66         pci_power_t (*get_state)(struct pci_dev *dev);
  67         pci_power_t (*choose_state)(struct pci_dev *dev);
  68         int (*sleep_wake)(struct pci_dev *dev, bool enable);
  69         int (*run_wake)(struct pci_dev *dev, bool enable);
  70         bool (*need_resume)(struct pci_dev *dev);
  71 };
  72
  73 int pci_set_platform_pm(const struct pci_platform_pm_ops *ops);
  74 void pci_update_current_state(struct pci_dev *dev, pci_power_t state);
  75 void pci_power_up(struct pci_dev *dev);
  76 void pci_disable_enabled_device(struct pci_dev *dev);
  77 int pci_finish_runtime_suspend(struct pci_dev *dev);
  78 int __pci_pme_wakeup(struct pci_dev *dev, void *ign);
  79 bool pci_dev_keep_suspended(struct pci_dev *dev);
  80 void pci_dev_complete_resume(struct pci_dev *pci_dev);
  81 void pci_config_pm_runtime_get(struct pci_dev *dev);
  82 void pci_config_pm_runtime_put(struct pci_dev *dev);
  83 void pci_pm_init(struct pci_dev *dev);
  84 void pci_ea_init(struct pci_dev *dev);
  85 void pci_allocate_cap_save_buffers(struct pci_dev *dev);
  86 void pci_free_cap_save_buffers(struct pci_dev *dev);
  87 bool pci_bridge_d3_possible(struct pci_dev *dev);
  88 void pci_bridge_d3_update(struct pci_dev *dev);
  89
  90 static inline void pci_wakeup_event(struct pci_dev *dev)
  91 {
  92         /* Wait 100 ms before the system can be put into a sleep state. */
  93         pm_wakeup_event(&dev->dev, 100);
  94 }
  95
  96 static inline bool pci_has_subordinate(struct pci_dev *pci_dev)
  97 {
  98         return !!(pci_dev->subordinate);
  99 }
 100
 101 static inline bool pci_power_manageable(struct pci_dev *pci_dev)
 102 {
 103         /*
 104          * Currently we allow normal PCI devices and PCI bridges transition
 105          * into D3 if their bridge_d3 is set.
 106          */
 107         return !pci_has_subordinate(pci_dev) || pci_dev->bridge_d3;
 108 }
 109
 110 struct pci_vpd_ops {
 111         ssize_t (*read)(struct pci_dev *dev, loff_t pos, size_t count, void *buf);
 112         ssize_t (*write)(struct pci_dev *dev, loff_t pos, size_t count, const void *buf);
 113         int (*set_size)(struct pci_dev *dev, size_t len);
 114 };
 115
 116 struct pci_vpd {
 117         const struct pci_vpd_ops *ops;
 118         struct bin_attribute *attr; /* descriptor for sysfs VPD entry */
 119         struct mutex    lock;
 120         unsigned int    len;
 121         u16             flag;
 122         u8              cap;
 123         u8              busy:1;
 124         u8              valid:1;
 125 };
 126
 127 int pci_vpd_init(struct pci_dev *dev);
 128 void pci_vpd_release(struct pci_dev *dev);
 129
 130 /* PCI /proc functions */
 131 #ifdef CONFIG_PROC_FS
 132 int pci_proc_attach_device(struct pci_dev *dev);
 133 int pci_proc_detach_device(struct pci_dev *dev);
 134 int pci_proc_detach_bus(struct pci_bus *bus);
 135 #else
 136 static inline int pci_proc_attach_device(struct pci_dev *dev) { return 0; }
 137 static inline int pci_proc_detach_device(struct pci_dev *dev) { return 0; }
 138 static inline int pci_proc_detach_bus(struct pci_bus *bus) { return 0; }
 139 #endif
 140
 141 /* Functions for PCI Hotplug drivers to use */
 142 int pci_hp_add_bridge(struct pci_dev *dev);
 143
 144 #ifdef HAVE_PCI_LEGACY
 145 void pci_create_legacy_files(struct pci_bus *bus);
 146 void pci_remove_legacy_files(struct pci_bus *bus);
 147 #else
 148 static inline void pci_create_legacy_files(struct pci_bus *bus) { return; }
 149 static inline void pci_remove_legacy_files(struct pci_bus *bus) { return; }
 150 #endif
 151
 152 /* Lock for read/write access to pci device and bus lists */
 153 extern struct rw_semaphore pci_bus_sem;
 154
 155 extern raw_spinlock_t pci_lock;
 156
 157 extern unsigned int pci_pm_d3_delay;
 158
 159 #ifdef CONFIG_PCI_MSI
 160 void pci_no_msi(void);
 161 #else
 162 static inline void pci_no_msi(void) { }
 163 #endif
 164
 165 static inline void pci_msi_set_enable(struct pci_dev *dev, int enable)
 166 {
 167         u16 control;
 168
 169         pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
 170         control &= ~PCI_MSI_FLAGS_ENABLE;
 171         if (enable)
 172                 control |= PCI_MSI_FLAGS_ENABLE;
 173         pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, control);
 174 }
 175
 176 static inline void pci_msix_clear_and_set_ctrl(struct pci_dev *dev, u16 clear, u16 set)
 177 {
 178         u16 ctrl;
 179
 180         pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &ctrl);
 181         ctrl &= ~clear;
 182         ctrl |= set;
 183         pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, ctrl);
 184 }
 185
 186 void pci_realloc_get_opt(char *);
 187
 188 static inline int pci_no_d1d2(struct pci_dev *dev)
 189 {
 190         unsigned int parent_dstates = 0;
 191
 192         if (dev->bus->self)
 193                 parent_dstates = dev->bus->self->no_d1d2;
 194         return (dev->no_d1d2 || parent_dstates);
 195
 196 }
 197 extern const struct attribute_group *pci_dev_groups[];
 198 extern const struct attribute_group *pcibus_groups[];
 199 extern struct device_type pci_dev_type;
 200 extern const struct attribute_group *pci_bus_groups[];
 201
 202
 203 /**
 204  * pci_match_one_device - Tell if a PCI device structure has a matching
 205  *                        PCI device id structure
 206  * @id: single PCI device id structure to match
 207  * @dev: the PCI device structure to match against
 208  *
 209  * Returns the matching pci_device_id structure or %NULL if there is no match.
 210  */
 211 static inline const struct pci_device_id *
 212 pci_match_one_device(const struct pci_device_id *id, const struct pci_dev *dev)
 213 {
 214         if ((id->vendor == PCI_ANY_ID || id->vendor == dev->vendor) &&
 215             (id->device == PCI_ANY_ID || id->device == dev->device) &&
 216             (id->subvendor == PCI_ANY_ID || id->subvendor == dev->subsystem_vendor) &&
 217             (id->subdevice == PCI_ANY_ID || id->subdevice == dev->subsystem_device) &&
 218             !((id->class ^ dev->class) & id->class_mask))
 219                 return id;
 220         return NULL;
 221 }
 222
 223 /* PCI slot sysfs helper code */
 224 #define to_pci_slot(s) container_of(s, struct pci_slot, kobj)
 225
 226 extern struct kset *pci_slots_kset;
 227
 228 struct pci_slot_attribute {
 229         struct attribute attr;
 230         ssize_t (*show)(struct pci_slot *, char *);
 231         ssize_t (*store)(struct pci_slot *, const char *, size_t);
 232 };
 233 #define to_pci_slot_attr(s) container_of(s, struct pci_slot_attribute, attr)
 234
 235 enum pci_bar_type {
 236         pci_bar_unknown,        /* Standard PCI BAR probe */
 237         pci_bar_io,             /* An io port BAR */
 238         pci_bar_mem32,          /* A 32-bit memory BAR */
 239         pci_bar_mem64,          /* A 64-bit memory BAR */
 240 };
 241
 242 bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *pl,
 243                                 int crs_timeout);
 244 int pci_setup_device(struct pci_dev *dev);
 245 int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
 246                     struct resource *res, unsigned int reg);
 247 void pci_configure_ari(struct pci_dev *dev);
 248 void __pci_bus_size_bridges(struct pci_bus *bus,
 249                         struct list_head *realloc_head);
 250 void __pci_bus_assign_resources(const struct pci_bus *bus,
 251                                 struct list_head *realloc_head,
 252                                 struct list_head *fail_head);
 253 bool pci_bus_clip_resource(struct pci_dev *dev, int idx);
 254
 255 void pci_reassigndev_resource_alignment(struct pci_dev *dev);
 256 void pci_disable_bridge_window(struct pci_dev *dev);
 257
 258 /* Single Root I/O Virtualization */
 259 struct pci_sriov {
 260         int pos;                /* capability position */
 261         int nres;               /* number of resources */
 262         u32 cap;                /* SR-IOV Capabilities */
 263         u16 ctrl;               /* SR-IOV Control */
 264         u16 total_VFs;          /* total VFs associated with the PF */
 265         u16 initial_VFs;        /* initial VFs associated with the PF */
 266         u16 num_VFs;            /* number of VFs available */
 267         u16 offset;             /* first VF Routing ID offset */
 268         u16 stride;             /* following VF stride */
 269         u32 pgsz;               /* page size for BAR alignment */
 270         u8 link;                /* Function Dependency Link */
 271         u8 max_VF_buses;        /* max buses consumed by VFs */
 272         u16 driver_max_VFs;     /* max num VFs driver supports */
 273         struct pci_dev *dev;    /* lowest numbered PF */
 274         struct pci_dev *self;   /* this PF */
 275         struct mutex lock;      /* lock for setting sriov_numvfs in sysfs */
 276         resource_size_t barsz[PCI_SRIOV_NUM_BARS];      /* VF BAR size */
 277         bool drivers_autoprobe; /* auto probing of VFs by driver */
 278 };
 279
 280 /* pci_dev priv_flags */
 281 #define PCI_DEV_DISCONNECTED 0
 282
 283 static inline int pci_dev_set_disconnected(struct pci_dev *dev, void *unused)
 284 {
 285         set_bit(PCI_DEV_DISCONNECTED, &dev->priv_flags);
 286         return 0;
 287 }
 288
 289 static inline bool pci_dev_is_disconnected(const struct pci_dev *dev)
 290 {
 291         return test_bit(PCI_DEV_DISCONNECTED, &dev->priv_flags);
 292 }
 293
 294 #ifdef CONFIG_PCI_ATS
 295 void pci_restore_ats_state(struct pci_dev *dev);
 296 #else
 297 static inline void pci_restore_ats_state(struct pci_dev *dev)
 298 {
 299 }
 300 #endif /* CONFIG_PCI_ATS */
 301
 302 #ifdef CONFIG_PCI_IOV
 303 int pci_iov_init(struct pci_dev *dev);
 304 void pci_iov_release(struct pci_dev *dev);
 305 void pci_iov_update_resource(struct pci_dev *dev, int resno);
 306 resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno);
 307 void pci_restore_iov_state(struct pci_dev *dev);
 308 int pci_iov_bus_range(struct pci_bus *bus);
 309
 310 #else
 311 static inline int pci_iov_init(struct pci_dev *dev)
 312 {
 313         return -ENODEV;
 314 }
 315 static inline void pci_iov_release(struct pci_dev *dev)
 316
 317 {
 318 }
 319 static inline void pci_restore_iov_state(struct pci_dev *dev)
 320 {
 321 }
 322 static inline int pci_iov_bus_range(struct pci_bus *bus)
 323 {
 324         return 0;
 325 }
 326
 327 #endif /* CONFIG_PCI_IOV */
 328
 329 unsigned long pci_cardbus_resource_alignment(struct resource *);
 330
 331 static inline resource_size_t pci_resource_alignment(struct pci_dev *dev,
 332                                                      struct resource *res)
 333 {
 334 #ifdef CONFIG_PCI_IOV
 335         int resno = res - dev->resource;
 336
 337         if (resno >= PCI_IOV_RESOURCES && resno <= PCI_IOV_RESOURCE_END)
 338                 return pci_sriov_resource_alignment(dev, resno);
 339 #endif
 340         if (dev->class >> 8  == PCI_CLASS_BRIDGE_CARDBUS)
 341                 return pci_cardbus_resource_alignment(res);
 342         return resource_alignment(res);
 343 }
 344
 345 void pci_enable_acs(struct pci_dev *dev);
 346
 347 #ifdef CONFIG_PCIE_PTM
 348 void pci_ptm_init(struct pci_dev *dev);
 349 #else
 350 static inline void pci_ptm_init(struct pci_dev *dev) { }
 351 #endif
 352
 353 struct pci_dev_reset_methods {
 354         u16 vendor;
 355         u16 device;
 356         int (*reset)(struct pci_dev *dev, int probe);
 357 };
 358
 359 #ifdef CONFIG_PCI_QUIRKS
 360 int pci_dev_specific_reset(struct pci_dev *dev, int probe);
 361 #else
 362 static inline int pci_dev_specific_reset(struct pci_dev *dev, int probe)
 363 {
 364         return -ENOTTY;
 365 }
 366 #endif
 367
 368 #if defined(CONFIG_PCI_QUIRKS) && defined(CONFIG_ARM64)
 369 int acpi_get_rc_resources(struct device *dev, const char *hid, u16 segment,
 370                           struct resource *res);
 371 #endif
 372
 373 #endif /* DRIVERS_PCI_H */