4 * PCI defines and function prototypes
5 * Copyright 1994, Drew Eckhardt
6 * Copyright 1997--1999 Martin Mares <mj@ucw.cz>
8 * For more information, please consult the following manuals (look at
9 * http://www.pcisig.com/ for how to get them):
11 * PCI BIOS Specification
12 * PCI Local Bus Specification
13 * PCI to PCI Bridge Specification
14 * PCI System Design Guide
20 #include <linux/mod_devicetable.h>
22 #include <linux/types.h>
23 #include <linux/init.h>
24 #include <linux/ioport.h>
25 #include <linux/list.h>
26 #include <linux/compiler.h>
27 #include <linux/errno.h>
28 #include <linux/kobject.h>
29 #include <linux/atomic.h>
30 #include <linux/device.h>
32 #include <linux/irqreturn.h>
33 #include <uapi/linux/pci.h>
35 /* Include the ID list */
36 #include <linux/pci_ids.h>
39 * The PCI interface treats multi-function devices as independent
40 * devices. The slot/function address of each device is encoded
41 * in a single byte as follows:
45 * PCI_DEVFN(), PCI_SLOT(), and PCI_FUNC() are defined uapi/linux/pci.h
46 * In the interest of not exposing interfaces to user-space unnecessarily,
47 * the following kernel only defines are being added here.
49 #define PCI_DEVID(bus, devfn) ((((u16)bus) << 8) | devfn)
50 /* return bus from PCI devid = ((u16)bus_number) << 8) | devfn */
51 #define PCI_BUS_NUM(x) (((x) >> 8) & 0xff)
53 /* pci_slot represents a physical slot */
55 struct pci_bus *bus; /* The bus this slot is on */
56 struct list_head list; /* node in list of slots on this bus */
57 struct hotplug_slot *hotplug; /* Hotplug info (migrate over time) */
58 unsigned char number; /* PCI_SLOT(pci_dev->devfn) */
62 static inline const char *pci_slot_name(const struct pci_slot *slot)
64 return kobject_name(&slot->kobj);
67 /* File state for mmap()s on /proc/bus/pci/X/Y */
73 /* This defines the direction arg to the DMA mapping routines. */
74 #define PCI_DMA_BIDIRECTIONAL 0
75 #define PCI_DMA_TODEVICE 1
76 #define PCI_DMA_FROMDEVICE 2
77 #define PCI_DMA_NONE 3
80 * For PCI devices, the region numbers are assigned this way:
83 /* #0-5: standard PCI resources */
85 PCI_STD_RESOURCE_END = 5,
87 /* #6: expansion ROM resource */
90 /* device specific resources */
93 PCI_IOV_RESOURCE_END = PCI_IOV_RESOURCES + PCI_SRIOV_NUM_BARS - 1,
96 /* resources assigned to buses behind the bridge */
97 #define PCI_BRIDGE_RESOURCE_NUM 4
100 PCI_BRIDGE_RESOURCE_END = PCI_BRIDGE_RESOURCES +
101 PCI_BRIDGE_RESOURCE_NUM - 1,
103 /* total resources associated with a PCI device */
106 /* preserve this for compatibility */
107 DEVICE_COUNT_RESOURCE = PCI_NUM_RESOURCES,
110 typedef int __bitwise pci_power_t;
112 #define PCI_D0 ((pci_power_t __force) 0)
113 #define PCI_D1 ((pci_power_t __force) 1)
114 #define PCI_D2 ((pci_power_t __force) 2)
115 #define PCI_D3hot ((pci_power_t __force) 3)
116 #define PCI_D3cold ((pci_power_t __force) 4)
117 #define PCI_UNKNOWN ((pci_power_t __force) 5)
118 #define PCI_POWER_ERROR ((pci_power_t __force) -1)
120 /* Remember to update this when the list above changes! */
121 extern const char *pci_power_names[];
123 static inline const char *pci_power_name(pci_power_t state)
125 return pci_power_names[1 + (int) state];
128 #define PCI_PM_D2_DELAY 200
129 #define PCI_PM_D3_WAIT 10
130 #define PCI_PM_D3COLD_WAIT 100
131 #define PCI_PM_BUS_WAIT 50
133 /** The pci_channel state describes connectivity between the CPU and
134 * the pci device. If some PCI bus between here and the pci device
135 * has crashed or locked up, this info is reflected here.
137 typedef unsigned int __bitwise pci_channel_state_t;
139 enum pci_channel_state {
140 /* I/O channel is in normal state */
141 pci_channel_io_normal = (__force pci_channel_state_t) 1,
143 /* I/O to channel is blocked */
144 pci_channel_io_frozen = (__force pci_channel_state_t) 2,
146 /* PCI card is dead */
147 pci_channel_io_perm_failure = (__force pci_channel_state_t) 3,
150 typedef unsigned int __bitwise pcie_reset_state_t;
152 enum pcie_reset_state {
153 /* Reset is NOT asserted (Use to deassert reset) */
154 pcie_deassert_reset = (__force pcie_reset_state_t) 1,
156 /* Use #PERST to reset PCI-E device */
157 pcie_warm_reset = (__force pcie_reset_state_t) 2,
159 /* Use PCI-E Hot Reset to reset device */
160 pcie_hot_reset = (__force pcie_reset_state_t) 3
163 typedef unsigned short __bitwise pci_dev_flags_t;
165 /* INTX_DISABLE in PCI_COMMAND register disables MSI
168 PCI_DEV_FLAGS_MSI_INTX_DISABLE_BUG = (__force pci_dev_flags_t) 1,
169 /* Device configuration is irrevocably lost if disabled into D3 */
170 PCI_DEV_FLAGS_NO_D3 = (__force pci_dev_flags_t) 2,
171 /* Provide indication device is assigned by a Virtual Machine Manager */
172 PCI_DEV_FLAGS_ASSIGNED = (__force pci_dev_flags_t) 4,
175 enum pci_irq_reroute_variant {
176 INTEL_IRQ_REROUTE_VARIANT = 1,
177 MAX_IRQ_REROUTE_VARIANTS = 3
180 typedef unsigned short __bitwise pci_bus_flags_t;
182 PCI_BUS_FLAGS_NO_MSI = (__force pci_bus_flags_t) 1,
183 PCI_BUS_FLAGS_NO_MMRBC = (__force pci_bus_flags_t) 2,
186 /* Based on the PCI Hotplug Spec, but some values are made up by us */
188 PCI_SPEED_33MHz = 0x00,
189 PCI_SPEED_66MHz = 0x01,
190 PCI_SPEED_66MHz_PCIX = 0x02,
191 PCI_SPEED_100MHz_PCIX = 0x03,
192 PCI_SPEED_133MHz_PCIX = 0x04,
193 PCI_SPEED_66MHz_PCIX_ECC = 0x05,
194 PCI_SPEED_100MHz_PCIX_ECC = 0x06,
195 PCI_SPEED_133MHz_PCIX_ECC = 0x07,
196 PCI_SPEED_66MHz_PCIX_266 = 0x09,
197 PCI_SPEED_100MHz_PCIX_266 = 0x0a,
198 PCI_SPEED_133MHz_PCIX_266 = 0x0b,
204 PCI_SPEED_66MHz_PCIX_533 = 0x11,
205 PCI_SPEED_100MHz_PCIX_533 = 0x12,
206 PCI_SPEED_133MHz_PCIX_533 = 0x13,
207 PCIE_SPEED_2_5GT = 0x14,
208 PCIE_SPEED_5_0GT = 0x15,
209 PCIE_SPEED_8_0GT = 0x16,
210 PCI_SPEED_UNKNOWN = 0xff,
213 struct pci_cap_saved_data {
219 struct pci_cap_saved_state {
220 struct hlist_node next;
221 struct pci_cap_saved_data cap;
224 struct pcie_link_state;
230 * The pci_dev structure is used to describe PCI devices.
233 struct list_head bus_list; /* node in per-bus list */
234 struct pci_bus *bus; /* bus this device is on */
235 struct pci_bus *subordinate; /* bus this device bridges to */
237 void *sysdata; /* hook for sys-specific extension */
238 struct proc_dir_entry *procent; /* device entry in /proc/bus/pci */
239 struct pci_slot *slot; /* Physical slot this device is in */
241 unsigned int devfn; /* encoded device & function index */
242 unsigned short vendor;
243 unsigned short device;
244 unsigned short subsystem_vendor;
245 unsigned short subsystem_device;
246 unsigned int class; /* 3 bytes: (base,sub,prog-if) */
247 u8 revision; /* PCI revision, low byte of class word */
248 u8 hdr_type; /* PCI header type (`multi' flag masked out) */
249 u8 pcie_cap; /* PCI-E capability offset */
250 u8 msi_cap; /* MSI capability offset */
251 u8 msix_cap; /* MSI-X capability offset */
252 u8 pcie_mpss:3; /* PCI-E Max Payload Size Supported */
253 u8 rom_base_reg; /* which config register controls the ROM */
254 u8 pin; /* which interrupt pin this device uses */
255 u16 pcie_flags_reg; /* cached PCI-E Capabilities Register */
257 struct pci_driver *driver; /* which driver has allocated this device */
258 u64 dma_mask; /* Mask of the bits of bus address this
259 device implements. Normally this is
260 0xffffffff. You only need to change
261 this if your device has broken DMA
262 or supports 64-bit transfers. */
264 struct device_dma_parameters dma_parms;
266 pci_power_t current_state; /* Current operating state. In ACPI-speak,
267 this is D0-D3, D0 being fully functional,
269 u8 pm_cap; /* PM capability offset */
270 unsigned int pme_support:5; /* Bitmask of states from which PME#
272 unsigned int pme_interrupt:1;
273 unsigned int pme_poll:1; /* Poll device's PME status bit */
274 unsigned int d1_support:1; /* Low power state D1 is supported */
275 unsigned int d2_support:1; /* Low power state D2 is supported */
276 unsigned int no_d1d2:1; /* D1 and D2 are forbidden */
277 unsigned int no_d3cold:1; /* D3cold is forbidden */
278 unsigned int d3cold_allowed:1; /* D3cold is allowed by user */
279 unsigned int mmio_always_on:1; /* disallow turning off io/mem
280 decoding during bar sizing */
281 unsigned int wakeup_prepared:1;
282 unsigned int runtime_d3cold:1; /* whether go through runtime
283 D3cold, not set for devices
284 powered on/off by the
285 corresponding bridge */
286 unsigned int d3_delay; /* D3->D0 transition time in ms */
287 unsigned int d3cold_delay; /* D3cold->D0 transition time in ms */
289 #ifdef CONFIG_PCIEASPM
290 struct pcie_link_state *link_state; /* ASPM link state. */
293 pci_channel_state_t error_state; /* current connectivity state */
294 struct device dev; /* Generic device interface */
296 int cfg_size; /* Size of configuration space */
299 * Instead of touching interrupt line and base address registers
300 * directly, use the values stored here. They might be different!
303 struct resource resource[DEVICE_COUNT_RESOURCE]; /* I/O and memory regions + expansion ROMs */
305 bool match_driver; /* Skip attaching driver */
306 /* These fields are used by common fixups */
307 unsigned int transparent:1; /* Transparent PCI bridge */
308 unsigned int multifunction:1;/* Part of multi-function device */
309 /* keep track of device state */
310 unsigned int is_added:1;
311 unsigned int is_busmaster:1; /* device is busmaster */
312 unsigned int no_msi:1; /* device may not use msi */
313 unsigned int no_64bit_msi:1; /* device may only use 32-bit MSIs */
314 unsigned int block_cfg_access:1; /* config space access is blocked */
315 unsigned int broken_parity_status:1; /* Device generates false positive parity */
316 unsigned int irq_reroute_variant:2; /* device needs IRQ rerouting variant */
317 unsigned int msi_enabled:1;
318 unsigned int msix_enabled:1;
319 unsigned int ari_enabled:1; /* ARI forwarding */
320 unsigned int is_managed:1;
321 unsigned int is_pcie:1; /* Obsolete. Will be removed.
322 Use pci_is_pcie() instead */
323 unsigned int needs_freset:1; /* Dev requires fundamental reset */
324 unsigned int state_saved:1;
325 unsigned int is_physfn:1;
326 unsigned int is_virtfn:1;
327 unsigned int reset_fn:1;
328 unsigned int is_hotplug_bridge:1;
329 unsigned int __aer_firmware_first_valid:1;
330 unsigned int __aer_firmware_first:1;
331 unsigned int broken_intx_masking:1;
332 unsigned int io_window_1k:1; /* Intel P2P bridge 1K I/O windows */
333 pci_dev_flags_t dev_flags;
334 atomic_t enable_cnt; /* pci_enable_device has been called */
336 u32 saved_config_space[16]; /* config space saved at suspend time */
337 struct hlist_head saved_cap_space;
338 struct bin_attribute *rom_attr; /* attribute descriptor for sysfs ROM entry */
339 int rom_attr_enabled; /* has display of the rom attribute been enabled? */
340 struct bin_attribute *res_attr[DEVICE_COUNT_RESOURCE]; /* sysfs file for resources */
341 struct bin_attribute *res_attr_wc[DEVICE_COUNT_RESOURCE]; /* sysfs file for WC mapping of resources */
342 #ifdef CONFIG_PCI_MSI
343 struct list_head msi_list;
344 struct kset *msi_kset;
347 #ifdef CONFIG_PCI_ATS
349 struct pci_sriov *sriov; /* SR-IOV capability related */
350 struct pci_dev *physfn; /* the PF this VF is associated with */
352 struct pci_ats *ats; /* Address Translation Service */
354 phys_addr_t rom; /* Physical address of ROM if it's not from the BAR */
355 size_t romlen; /* Length of ROM if it's not from the BAR */
358 static inline struct pci_dev *pci_physfn(struct pci_dev *dev)
360 #ifdef CONFIG_PCI_IOV
368 struct pci_dev *alloc_pci_dev(void);
370 #define to_pci_dev(n) container_of(n, struct pci_dev, dev)
371 #define for_each_pci_dev(d) while ((d = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, d)) != NULL)
373 static inline int pci_channel_offline(struct pci_dev *pdev)
375 return (pdev->error_state != pci_channel_io_normal);
378 extern struct resource busn_resource;
380 struct pci_host_bridge_window {
381 struct list_head list;
382 struct resource *res; /* host bridge aperture (CPU address) */
383 resource_size_t offset; /* bus address + offset = CPU address */
386 struct pci_host_bridge {
388 struct pci_bus *bus; /* root bus */
389 struct list_head windows; /* pci_host_bridge_windows */
390 void (*release_fn)(struct pci_host_bridge *);
394 #define to_pci_host_bridge(n) container_of(n, struct pci_host_bridge, dev)
395 void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
396 void (*release_fn)(struct pci_host_bridge *),
399 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge);
402 * The first PCI_BRIDGE_RESOURCE_NUM PCI bus resources (those that correspond
403 * to P2P or CardBus bridge windows) go in a table. Additional ones (for
404 * buses below host bridges or subtractive decode bridges) go in the list.
405 * Use pci_bus_for_each_resource() to iterate through all the resources.
409 * PCI_SUBTRACTIVE_DECODE means the bridge forwards the window implicitly
410 * and there's no way to program the bridge with the details of the window.
411 * This does not apply to ACPI _CRS windows, even with the _DEC subtractive-
412 * decode bit set, because they are explicit and can be programmed with _SRS.
414 #define PCI_SUBTRACTIVE_DECODE 0x1
416 struct pci_bus_resource {
417 struct list_head list;
418 struct resource *res;
422 #define PCI_REGION_FLAG_MASK 0x0fU /* These bits of resource flags tell us the PCI region flags */
425 struct list_head node; /* node in list of buses */
426 struct pci_bus *parent; /* parent bus this bridge is on */
427 struct list_head children; /* list of child buses */
428 struct list_head devices; /* list of devices on this bus */
429 struct pci_dev *self; /* bridge device as seen by parent */
430 struct list_head slots; /* list of slots on this bus */
431 struct resource *resource[PCI_BRIDGE_RESOURCE_NUM];
432 struct list_head resources; /* address space routed to this bus */
433 struct resource busn_res; /* bus numbers routed to this bus */
435 struct pci_ops *ops; /* configuration access functions */
436 void *sysdata; /* hook for sys-specific extension */
437 struct proc_dir_entry *procdir; /* directory entry in /proc/bus/pci */
439 unsigned char number; /* bus number */
440 unsigned char primary; /* number of primary bridge */
441 unsigned char max_bus_speed; /* enum pci_bus_speed */
442 unsigned char cur_bus_speed; /* enum pci_bus_speed */
446 unsigned short bridge_ctl; /* manage NO_ISA/FBB/et al behaviors */
447 pci_bus_flags_t bus_flags; /* Inherited by child busses */
448 struct device *bridge;
450 struct bin_attribute *legacy_io; /* legacy I/O for this bus */
451 struct bin_attribute *legacy_mem; /* legacy mem */
452 unsigned int is_added:1;
455 #define pci_bus_b(n) list_entry(n, struct pci_bus, node)
456 #define to_pci_bus(n) container_of(n, struct pci_bus, dev)
459 * Returns true if the pci bus is root (behind host-pci bridge),
462 static inline bool pci_is_root_bus(struct pci_bus *pbus)
464 return !(pbus->parent);
467 #ifdef CONFIG_PCI_MSI
468 static inline bool pci_dev_msi_enabled(struct pci_dev *pci_dev)
470 return pci_dev->msi_enabled || pci_dev->msix_enabled;
473 static inline bool pci_dev_msi_enabled(struct pci_dev *pci_dev) { return false; }
477 * Error values that may be returned by PCI functions.
479 #define PCIBIOS_SUCCESSFUL 0x00
480 #define PCIBIOS_FUNC_NOT_SUPPORTED 0x81
481 #define PCIBIOS_BAD_VENDOR_ID 0x83
482 #define PCIBIOS_DEVICE_NOT_FOUND 0x86
483 #define PCIBIOS_BAD_REGISTER_NUMBER 0x87
484 #define PCIBIOS_SET_FAILED 0x88
485 #define PCIBIOS_BUFFER_TOO_SMALL 0x89
488 * Translate above to generic errno for passing back through non-pci.
490 static inline int pcibios_err_to_errno(int err)
492 if (err <= PCIBIOS_SUCCESSFUL)
493 return err; /* Assume already errno */
496 case PCIBIOS_FUNC_NOT_SUPPORTED:
498 case PCIBIOS_BAD_VENDOR_ID:
500 case PCIBIOS_DEVICE_NOT_FOUND:
502 case PCIBIOS_BAD_REGISTER_NUMBER:
504 case PCIBIOS_SET_FAILED:
506 case PCIBIOS_BUFFER_TOO_SMALL:
513 /* Low-level architecture-dependent routines */
516 int (*read)(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val);
517 int (*write)(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val);
521 * ACPI needs to be able to access PCI config space before we've done a
522 * PCI bus scan and created pci_bus structures.
524 int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
525 int reg, int len, u32 *val);
526 int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
527 int reg, int len, u32 val);
529 struct pci_bus_region {
530 resource_size_t start;
535 spinlock_t lock; /* protects list, index */
536 struct list_head list; /* for IDs added at runtime */
539 /* ---------------------------------------------------------------- */
540 /** PCI Error Recovery System (PCI-ERS). If a PCI device driver provides
541 * a set of callbacks in struct pci_error_handlers, then that device driver
542 * will be notified of PCI bus errors, and will be driven to recovery
543 * when an error occurs.
546 typedef unsigned int __bitwise pci_ers_result_t;
548 enum pci_ers_result {
549 /* no result/none/not supported in device driver */
550 PCI_ERS_RESULT_NONE = (__force pci_ers_result_t) 1,
552 /* Device driver can recover without slot reset */
553 PCI_ERS_RESULT_CAN_RECOVER = (__force pci_ers_result_t) 2,
555 /* Device driver wants slot to be reset. */
556 PCI_ERS_RESULT_NEED_RESET = (__force pci_ers_result_t) 3,
558 /* Device has completely failed, is unrecoverable */
559 PCI_ERS_RESULT_DISCONNECT = (__force pci_ers_result_t) 4,
561 /* Device driver is fully recovered and operational */
562 PCI_ERS_RESULT_RECOVERED = (__force pci_ers_result_t) 5,
564 /* No AER capabilities registered for the driver */
565 PCI_ERS_RESULT_NO_AER_DRIVER = (__force pci_ers_result_t) 6,
568 /* PCI bus error event callbacks */
569 struct pci_error_handlers {
570 /* PCI bus error detected on this device */
571 pci_ers_result_t (*error_detected)(struct pci_dev *dev,
572 enum pci_channel_state error);
574 /* MMIO has been re-enabled, but not DMA */
575 pci_ers_result_t (*mmio_enabled)(struct pci_dev *dev);
577 /* PCI Express link has been reset */
578 pci_ers_result_t (*link_reset)(struct pci_dev *dev);
580 /* PCI slot has been reset */
581 pci_ers_result_t (*slot_reset)(struct pci_dev *dev);
583 /* Device driver may resume normal operations */
584 void (*resume)(struct pci_dev *dev);
587 /* ---------------------------------------------------------------- */
591 struct list_head node;
593 const struct pci_device_id *id_table; /* must be non-NULL for probe to be called */
594 int (*probe) (struct pci_dev *dev, const struct pci_device_id *id); /* New device inserted */
595 void (*remove) (struct pci_dev *dev); /* Device removed (NULL if not a hot-plug capable driver) */
596 int (*suspend) (struct pci_dev *dev, pm_message_t state); /* Device suspended */
597 int (*suspend_late) (struct pci_dev *dev, pm_message_t state);
598 int (*resume_early) (struct pci_dev *dev);
599 int (*resume) (struct pci_dev *dev); /* Device woken up */
600 void (*shutdown) (struct pci_dev *dev);
601 int (*sriov_configure) (struct pci_dev *dev, int num_vfs); /* PF pdev */
602 const struct pci_error_handlers *err_handler;
603 struct device_driver driver;
604 struct pci_dynids dynids;
607 #define to_pci_driver(drv) container_of(drv, struct pci_driver, driver)
610 * DEFINE_PCI_DEVICE_TABLE - macro used to describe a pci device table
611 * @_table: device table name
613 * This macro is used to create a struct pci_device_id array (a device table)
614 * in a generic manner.
616 #define DEFINE_PCI_DEVICE_TABLE(_table) \
617 const struct pci_device_id _table[]
620 * PCI_DEVICE - macro used to describe a specific pci device
621 * @vend: the 16 bit PCI Vendor ID
622 * @dev: the 16 bit PCI Device ID
624 * This macro is used to create a struct pci_device_id that matches a
625 * specific device. The subvendor and subdevice fields will be set to
628 #define PCI_DEVICE(vend,dev) \
629 .vendor = (vend), .device = (dev), \
630 .subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID
633 * PCI_DEVICE_SUB - macro used to describe a specific pci device with subsystem
634 * @vend: the 16 bit PCI Vendor ID
635 * @dev: the 16 bit PCI Device ID
636 * @subvend: the 16 bit PCI Subvendor ID
637 * @subdev: the 16 bit PCI Subdevice ID
639 * This macro is used to create a struct pci_device_id that matches a
640 * specific device with subsystem information.
642 #define PCI_DEVICE_SUB(vend, dev, subvend, subdev) \
643 .vendor = (vend), .device = (dev), \
644 .subvendor = (subvend), .subdevice = (subdev)
647 * PCI_DEVICE_CLASS - macro used to describe a specific pci device class
648 * @dev_class: the class, subclass, prog-if triple for this device
649 * @dev_class_mask: the class mask for this device
651 * This macro is used to create a struct pci_device_id that matches a
652 * specific PCI class. The vendor, device, subvendor, and subdevice
653 * fields will be set to PCI_ANY_ID.
655 #define PCI_DEVICE_CLASS(dev_class,dev_class_mask) \
656 .class = (dev_class), .class_mask = (dev_class_mask), \
657 .vendor = PCI_ANY_ID, .device = PCI_ANY_ID, \
658 .subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID
661 * PCI_VDEVICE - macro used to describe a specific pci device in short form
662 * @vendor: the vendor name
663 * @device: the 16 bit PCI Device ID
665 * This macro is used to create a struct pci_device_id that matches a
666 * specific PCI device. The subvendor, and subdevice fields will be set
667 * to PCI_ANY_ID. The macro allows the next field to follow as the device
671 #define PCI_VDEVICE(vendor, device) \
672 PCI_VENDOR_ID_##vendor, (device), \
673 PCI_ANY_ID, PCI_ANY_ID, 0, 0
675 /* these external functions are only available when PCI support is enabled */
678 void pcie_bus_configure_settings(struct pci_bus *bus, u8 smpss);
680 enum pcie_bus_config_types {
683 PCIE_BUS_PERFORMANCE,
687 extern enum pcie_bus_config_types pcie_bus_config;
689 extern struct bus_type pci_bus_type;
691 /* Do NOT directly access these two variables, unless you are arch specific pci
692 * code, or pci core code. */
693 extern struct list_head pci_root_buses; /* list of all known PCI buses */
694 /* Some device drivers need know if pci is initiated */
695 int no_pci_devices(void);
697 void pcibios_resource_survey_bus(struct pci_bus *bus);
698 void pcibios_add_bus(struct pci_bus *bus);
699 void pcibios_remove_bus(struct pci_bus *bus);
700 void pcibios_fixup_bus(struct pci_bus *);
701 int __must_check pcibios_enable_device(struct pci_dev *, int mask);
702 /* Architecture specific versions may override this (weak) */
703 char *pcibios_setup(char *str);
705 /* Used only when drivers/pci/setup.c is used */
706 resource_size_t pcibios_align_resource(void *, const struct resource *,
709 void pcibios_update_irq(struct pci_dev *, int irq);
711 /* Weak but can be overriden by arch */
712 void pci_fixup_cardbus(struct pci_bus *);
714 /* Generic PCI functions used internally */
716 void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
717 struct resource *res);
718 void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
719 struct pci_bus_region *region);
720 void pcibios_scan_specific_bus(int busn);
721 struct pci_bus *pci_find_bus(int domain, int busnr);
722 void pci_bus_add_devices(const struct pci_bus *bus);
723 struct pci_bus *pci_scan_bus_parented(struct device *parent, int bus,
724 struct pci_ops *ops, void *sysdata);
725 struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, void *sysdata);
726 struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
727 struct pci_ops *ops, void *sysdata,
728 struct list_head *resources);
729 int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int busmax);
730 int pci_bus_update_busn_res_end(struct pci_bus *b, int busmax);
731 void pci_bus_release_busn_res(struct pci_bus *b);
732 struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
733 struct pci_ops *ops, void *sysdata,
734 struct list_head *resources);
735 struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev,
737 void pcie_update_link_speed(struct pci_bus *bus, u16 link_status);
738 struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr,
740 struct hotplug_slot *hotplug);
741 void pci_destroy_slot(struct pci_slot *slot);
742 void pci_renumber_slot(struct pci_slot *slot, int slot_nr);
743 int pci_scan_slot(struct pci_bus *bus, int devfn);
744 struct pci_dev *pci_scan_single_device(struct pci_bus *bus, int devfn);
745 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus);
746 unsigned int pci_scan_child_bus(struct pci_bus *bus);
747 int __must_check pci_bus_add_device(struct pci_dev *dev);
748 void pci_read_bridge_bases(struct pci_bus *child);
749 struct resource *pci_find_parent_resource(const struct pci_dev *dev,
750 struct resource *res);
751 u8 pci_swizzle_interrupt_pin(const struct pci_dev *dev, u8 pin);
752 int pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge);
753 u8 pci_common_swizzle(struct pci_dev *dev, u8 *pinp);
754 struct pci_dev *pci_dev_get(struct pci_dev *dev);
755 void pci_dev_put(struct pci_dev *dev);
756 void pci_remove_bus(struct pci_bus *b);
757 void pci_stop_and_remove_bus_device(struct pci_dev *dev);
758 void pci_stop_root_bus(struct pci_bus *bus);
759 void pci_remove_root_bus(struct pci_bus *bus);
760 void pci_setup_cardbus(struct pci_bus *bus);
761 void pci_sort_breadthfirst(void);
762 #define dev_is_pci(d) ((d)->bus == &pci_bus_type)
763 #define dev_is_pf(d) ((dev_is_pci(d) ? to_pci_dev(d)->is_physfn : false))
764 #define dev_num_vf(d) ((dev_is_pci(d) ? pci_num_vf(to_pci_dev(d)) : 0))
766 /* Generic PCI functions exported to card drivers */
768 enum pci_lost_interrupt_reason {
769 PCI_LOST_IRQ_NO_INFORMATION = 0,
770 PCI_LOST_IRQ_DISABLE_MSI,
771 PCI_LOST_IRQ_DISABLE_MSIX,
772 PCI_LOST_IRQ_DISABLE_ACPI,
774 enum pci_lost_interrupt_reason pci_lost_interrupt(struct pci_dev *dev);
775 int pci_find_capability(struct pci_dev *dev, int cap);
776 int pci_find_next_capability(struct pci_dev *dev, u8 pos, int cap);
777 int pci_find_ext_capability(struct pci_dev *dev, int cap);
778 int pci_find_next_ext_capability(struct pci_dev *dev, int pos, int cap);
779 int pci_find_ht_capability(struct pci_dev *dev, int ht_cap);
780 int pci_find_next_ht_capability(struct pci_dev *dev, int pos, int ht_cap);
781 struct pci_bus *pci_find_next_bus(const struct pci_bus *from);
783 struct pci_dev *pci_get_device(unsigned int vendor, unsigned int device,
784 struct pci_dev *from);
785 struct pci_dev *pci_get_subsys(unsigned int vendor, unsigned int device,
786 unsigned int ss_vendor, unsigned int ss_device,
787 struct pci_dev *from);
788 struct pci_dev *pci_get_slot(struct pci_bus *bus, unsigned int devfn);
789 struct pci_dev *pci_get_domain_bus_and_slot(int domain, unsigned int bus,
791 static inline struct pci_dev *pci_get_bus_and_slot(unsigned int bus,
794 return pci_get_domain_bus_and_slot(0, bus, devfn);
796 struct pci_dev *pci_get_class(unsigned int class, struct pci_dev *from);
797 int pci_dev_present(const struct pci_device_id *ids);
799 int pci_bus_read_config_byte(struct pci_bus *bus, unsigned int devfn,
801 int pci_bus_read_config_word(struct pci_bus *bus, unsigned int devfn,
802 int where, u16 *val);
803 int pci_bus_read_config_dword(struct pci_bus *bus, unsigned int devfn,
804 int where, u32 *val);
805 int pci_bus_write_config_byte(struct pci_bus *bus, unsigned int devfn,
807 int pci_bus_write_config_word(struct pci_bus *bus, unsigned int devfn,
809 int pci_bus_write_config_dword(struct pci_bus *bus, unsigned int devfn,
811 struct pci_ops *pci_bus_set_ops(struct pci_bus *bus, struct pci_ops *ops);
813 static inline int pci_read_config_byte(const struct pci_dev *dev, int where, u8 *val)
815 return pci_bus_read_config_byte(dev->bus, dev->devfn, where, val);
817 static inline int pci_read_config_word(const struct pci_dev *dev, int where, u16 *val)
819 return pci_bus_read_config_word(dev->bus, dev->devfn, where, val);
821 static inline int pci_read_config_dword(const struct pci_dev *dev, int where,
824 return pci_bus_read_config_dword(dev->bus, dev->devfn, where, val);
826 static inline int pci_write_config_byte(const struct pci_dev *dev, int where, u8 val)
828 return pci_bus_write_config_byte(dev->bus, dev->devfn, where, val);
830 static inline int pci_write_config_word(const struct pci_dev *dev, int where, u16 val)
832 return pci_bus_write_config_word(dev->bus, dev->devfn, where, val);
834 static inline int pci_write_config_dword(const struct pci_dev *dev, int where,
837 return pci_bus_write_config_dword(dev->bus, dev->devfn, where, val);
840 int pcie_capability_read_word(struct pci_dev *dev, int pos, u16 *val);
841 int pcie_capability_read_dword(struct pci_dev *dev, int pos, u32 *val);
842 int pcie_capability_write_word(struct pci_dev *dev, int pos, u16 val);
843 int pcie_capability_write_dword(struct pci_dev *dev, int pos, u32 val);
844 int pcie_capability_clear_and_set_word(struct pci_dev *dev, int pos,
846 int pcie_capability_clear_and_set_dword(struct pci_dev *dev, int pos,
849 static inline int pcie_capability_set_word(struct pci_dev *dev, int pos,
852 return pcie_capability_clear_and_set_word(dev, pos, 0, set);
855 static inline int pcie_capability_set_dword(struct pci_dev *dev, int pos,
858 return pcie_capability_clear_and_set_dword(dev, pos, 0, set);
861 static inline int pcie_capability_clear_word(struct pci_dev *dev, int pos,
864 return pcie_capability_clear_and_set_word(dev, pos, clear, 0);
867 static inline int pcie_capability_clear_dword(struct pci_dev *dev, int pos,
870 return pcie_capability_clear_and_set_dword(dev, pos, clear, 0);
873 /* user-space driven config access */
874 int pci_user_read_config_byte(struct pci_dev *dev, int where, u8 *val);
875 int pci_user_read_config_word(struct pci_dev *dev, int where, u16 *val);
876 int pci_user_read_config_dword(struct pci_dev *dev, int where, u32 *val);
877 int pci_user_write_config_byte(struct pci_dev *dev, int where, u8 val);
878 int pci_user_write_config_word(struct pci_dev *dev, int where, u16 val);
879 int pci_user_write_config_dword(struct pci_dev *dev, int where, u32 val);
881 int __must_check pci_enable_device(struct pci_dev *dev);
882 int __must_check pci_enable_device_io(struct pci_dev *dev);
883 int __must_check pci_enable_device_mem(struct pci_dev *dev);
884 int __must_check pci_reenable_device(struct pci_dev *);
885 int __must_check pcim_enable_device(struct pci_dev *pdev);
886 void pcim_pin_device(struct pci_dev *pdev);
888 static inline int pci_is_enabled(struct pci_dev *pdev)
890 return (atomic_read(&pdev->enable_cnt) > 0);
893 static inline int pci_is_managed(struct pci_dev *pdev)
895 return pdev->is_managed;
898 void pci_disable_device(struct pci_dev *dev);
900 extern unsigned int pcibios_max_latency;
901 void pci_set_master(struct pci_dev *dev);
902 void pci_clear_master(struct pci_dev *dev);
904 int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state);
905 int pci_set_cacheline_size(struct pci_dev *dev);
906 #define HAVE_PCI_SET_MWI
907 int __must_check pci_set_mwi(struct pci_dev *dev);
908 int pci_try_set_mwi(struct pci_dev *dev);
909 void pci_clear_mwi(struct pci_dev *dev);
910 void pci_intx(struct pci_dev *dev, int enable);
911 bool pci_intx_mask_supported(struct pci_dev *dev);
912 bool pci_check_and_mask_intx(struct pci_dev *dev);
913 bool pci_check_and_unmask_intx(struct pci_dev *dev);
914 void pci_msi_off(struct pci_dev *dev);
915 int pci_set_dma_max_seg_size(struct pci_dev *dev, unsigned int size);
916 int pci_set_dma_seg_boundary(struct pci_dev *dev, unsigned long mask);
917 int pcix_get_max_mmrbc(struct pci_dev *dev);
918 int pcix_get_mmrbc(struct pci_dev *dev);
919 int pcix_set_mmrbc(struct pci_dev *dev, int mmrbc);
920 int pcie_get_readrq(struct pci_dev *dev);
921 int pcie_set_readrq(struct pci_dev *dev, int rq);
922 int pcie_get_mps(struct pci_dev *dev);
923 int pcie_set_mps(struct pci_dev *dev, int mps);
924 int __pci_reset_function(struct pci_dev *dev);
925 int __pci_reset_function_locked(struct pci_dev *dev);
926 int pci_reset_function(struct pci_dev *dev);
927 void pci_update_resource(struct pci_dev *dev, int resno);
928 int __must_check pci_assign_resource(struct pci_dev *dev, int i);
929 int __must_check pci_reassign_resource(struct pci_dev *dev, int i, resource_size_t add_size, resource_size_t align);
930 int pci_select_bars(struct pci_dev *dev, unsigned long flags);
932 /* ROM control related routines */
933 int pci_enable_rom(struct pci_dev *pdev);
934 void pci_disable_rom(struct pci_dev *pdev);
935 void __iomem __must_check *pci_map_rom(struct pci_dev *pdev, size_t *size);
936 void pci_unmap_rom(struct pci_dev *pdev, void __iomem *rom);
937 size_t pci_get_rom_size(struct pci_dev *pdev, void __iomem *rom, size_t size);
938 void __iomem __must_check *pci_platform_rom(struct pci_dev *pdev, size_t *size);
940 /* Power management related routines */
941 int pci_save_state(struct pci_dev *dev);
942 void pci_restore_state(struct pci_dev *dev);
943 struct pci_saved_state *pci_store_saved_state(struct pci_dev *dev);
944 int pci_load_saved_state(struct pci_dev *dev, struct pci_saved_state *state);
945 int pci_load_and_free_saved_state(struct pci_dev *dev,
946 struct pci_saved_state **state);
947 int __pci_complete_power_transition(struct pci_dev *dev, pci_power_t state);
948 int pci_set_power_state(struct pci_dev *dev, pci_power_t state);
949 pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state);
950 bool pci_pme_capable(struct pci_dev *dev, pci_power_t state);
951 void pci_pme_active(struct pci_dev *dev, bool enable);
952 int __pci_enable_wake(struct pci_dev *dev, pci_power_t state,
953 bool runtime, bool enable);
954 int pci_wake_from_d3(struct pci_dev *dev, bool enable);
955 pci_power_t pci_target_state(struct pci_dev *dev);
956 int pci_prepare_to_sleep(struct pci_dev *dev);
957 int pci_back_from_sleep(struct pci_dev *dev);
958 bool pci_dev_run_wake(struct pci_dev *dev);
959 bool pci_check_pme_status(struct pci_dev *dev);
960 void pci_pme_wakeup_bus(struct pci_bus *bus);
962 static inline int pci_enable_wake(struct pci_dev *dev, pci_power_t state,
965 return __pci_enable_wake(dev, state, false, enable);
968 #define PCI_EXP_IDO_REQUEST (1<<0)
969 #define PCI_EXP_IDO_COMPLETION (1<<1)
970 void pci_enable_ido(struct pci_dev *dev, unsigned long type);
971 void pci_disable_ido(struct pci_dev *dev, unsigned long type);
973 enum pci_obff_signal_type {
974 PCI_EXP_OBFF_SIGNAL_L0 = 0,
975 PCI_EXP_OBFF_SIGNAL_ALWAYS = 1,
977 int pci_enable_obff(struct pci_dev *dev, enum pci_obff_signal_type);
978 void pci_disable_obff(struct pci_dev *dev);
980 int pci_enable_ltr(struct pci_dev *dev);
981 void pci_disable_ltr(struct pci_dev *dev);
982 int pci_set_ltr(struct pci_dev *dev, int snoop_lat_ns, int nosnoop_lat_ns);
984 /* For use by arch with custom probe code */
985 void set_pcie_port_type(struct pci_dev *pdev);
986 void set_pcie_hotplug_bridge(struct pci_dev *pdev);
988 /* Functions for PCI Hotplug drivers to use */
989 int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap);
990 unsigned int pci_rescan_bus_bridge_resize(struct pci_dev *bridge);
991 unsigned int pci_rescan_bus(struct pci_bus *bus);
993 /* Vital product data routines */
994 ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf);
995 ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf);
996 int pci_vpd_truncate(struct pci_dev *dev, size_t size);
998 /* Helper functions for low-level code (drivers/pci/setup-[bus,res].c) */
999 resource_size_t pcibios_retrieve_fw_addr(struct pci_dev *dev, int idx);
1000 void pci_bus_assign_resources(const struct pci_bus *bus);
1001 void pci_bus_size_bridges(struct pci_bus *bus);
1002 int pci_claim_resource(struct pci_dev *, int);
1003 void pci_assign_unassigned_resources(void);
1004 void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge);
1005 void pci_assign_unassigned_bus_resources(struct pci_bus *bus);
1006 void pdev_enable_device(struct pci_dev *);
1007 int pci_enable_resources(struct pci_dev *, int mask);
1008 void pci_fixup_irqs(u8 (*)(struct pci_dev *, u8 *),
1009 int (*)(const struct pci_dev *, u8, u8));
1010 #define HAVE_PCI_REQ_REGIONS 2
1011 int __must_check pci_request_regions(struct pci_dev *, const char *);
1012 int __must_check pci_request_regions_exclusive(struct pci_dev *, const char *);
1013 void pci_release_regions(struct pci_dev *);
1014 int __must_check pci_request_region(struct pci_dev *, int, const char *);
1015 int __must_check pci_request_region_exclusive(struct pci_dev *, int, const char *);
1016 void pci_release_region(struct pci_dev *, int);
1017 int pci_request_selected_regions(struct pci_dev *, int, const char *);
1018 int pci_request_selected_regions_exclusive(struct pci_dev *, int, const char *);
1019 void pci_release_selected_regions(struct pci_dev *, int);
1021 /* drivers/pci/bus.c */
1022 void pci_add_resource(struct list_head *resources, struct resource *res);
1023 void pci_add_resource_offset(struct list_head *resources, struct resource *res,
1024 resource_size_t offset);
1025 void pci_free_resource_list(struct list_head *resources);
1026 void pci_bus_add_resource(struct pci_bus *bus, struct resource *res, unsigned int flags);
1027 struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n);
1028 void pci_bus_remove_resources(struct pci_bus *bus);
1030 #define pci_bus_for_each_resource(bus, res, i) \
1032 (res = pci_bus_resource_n(bus, i)) || i < PCI_BRIDGE_RESOURCE_NUM; \
1035 int __must_check pci_bus_alloc_resource(struct pci_bus *bus,
1036 struct resource *res, resource_size_t size,
1037 resource_size_t align, resource_size_t min,
1038 unsigned int type_mask,
1039 resource_size_t (*alignf)(void *,
1040 const struct resource *,
1044 void pci_enable_bridges(struct pci_bus *bus);
1046 /* Proper probing supporting hot-pluggable devices */
1047 int __must_check __pci_register_driver(struct pci_driver *, struct module *,
1048 const char *mod_name);
1051 * pci_register_driver must be a macro so that KBUILD_MODNAME can be expanded
1053 #define pci_register_driver(driver) \
1054 __pci_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)
1056 void pci_unregister_driver(struct pci_driver *dev);
1059 * module_pci_driver() - Helper macro for registering a PCI driver
1060 * @__pci_driver: pci_driver struct
1062 * Helper macro for PCI drivers which do not do anything special in module
1063 * init/exit. This eliminates a lot of boilerplate. Each module may only
1064 * use this macro once, and calling it replaces module_init() and module_exit()
1066 #define module_pci_driver(__pci_driver) \
1067 module_driver(__pci_driver, pci_register_driver, \
1068 pci_unregister_driver)
1070 struct pci_driver *pci_dev_driver(const struct pci_dev *dev);
1071 int pci_add_dynid(struct pci_driver *drv,
1072 unsigned int vendor, unsigned int device,
1073 unsigned int subvendor, unsigned int subdevice,
1074 unsigned int class, unsigned int class_mask,
1075 unsigned long driver_data);
1076 const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
1077 struct pci_dev *dev);
1078 int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max,
1081 void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
1083 int pci_cfg_space_size_ext(struct pci_dev *dev);
1084 int pci_cfg_space_size(struct pci_dev *dev);
1085 unsigned char pci_bus_max_busnr(struct pci_bus *bus);
1086 void pci_setup_bridge(struct pci_bus *bus);
1087 resource_size_t pcibios_window_alignment(struct pci_bus *bus,
1088 unsigned long type);
1090 #define PCI_VGA_STATE_CHANGE_BRIDGE (1 << 0)
1091 #define PCI_VGA_STATE_CHANGE_DECODES (1 << 1)
1093 int pci_set_vga_state(struct pci_dev *pdev, bool decode,
1094 unsigned int command_bits, u32 flags);
1095 /* kmem_cache style wrapper around pci_alloc_consistent() */
1097 #include <linux/pci-dma.h>
1098 #include <linux/dmapool.h>
1100 #define pci_pool dma_pool
1101 #define pci_pool_create(name, pdev, size, align, allocation) \
1102 dma_pool_create(name, &pdev->dev, size, align, allocation)
1103 #define pci_pool_destroy(pool) dma_pool_destroy(pool)
1104 #define pci_pool_alloc(pool, flags, handle) dma_pool_alloc(pool, flags, handle)
1105 #define pci_pool_free(pool, vaddr, addr) dma_pool_free(pool, vaddr, addr)
1107 enum pci_dma_burst_strategy {
1108 PCI_DMA_BURST_INFINITY, /* make bursts as large as possible,
1109 strategy_parameter is N/A */
1110 PCI_DMA_BURST_BOUNDARY, /* disconnect at every strategy_parameter
1112 PCI_DMA_BURST_MULTIPLE, /* disconnect at some multiple of
1113 strategy_parameter byte boundaries */
1117 u32 vector; /* kernel uses to write allocated vector */
1118 u16 entry; /* driver uses to specify entry, OS writes */
1122 #ifndef CONFIG_PCI_MSI
1123 static inline int pci_enable_msi_block(struct pci_dev *dev, unsigned int nvec)
1129 pci_enable_msi_block_auto(struct pci_dev *dev, unsigned int *maxvec)
1134 static inline void pci_msi_shutdown(struct pci_dev *dev)
1136 static inline void pci_disable_msi(struct pci_dev *dev)
1139 static inline int pci_msix_table_size(struct pci_dev *dev)
1143 static inline int pci_enable_msix(struct pci_dev *dev,
1144 struct msix_entry *entries, int nvec)
1149 static inline void pci_msix_shutdown(struct pci_dev *dev)
1151 static inline void pci_disable_msix(struct pci_dev *dev)
1154 static inline void msi_remove_pci_irq_vectors(struct pci_dev *dev)
1157 static inline void pci_restore_msi_state(struct pci_dev *dev)
1159 static inline int pci_msi_enabled(void)
1164 int pci_enable_msi_block(struct pci_dev *dev, unsigned int nvec);
1165 int pci_enable_msi_block_auto(struct pci_dev *dev, unsigned int *maxvec);
1166 void pci_msi_shutdown(struct pci_dev *dev);
1167 void pci_disable_msi(struct pci_dev *dev);
1168 int pci_msix_table_size(struct pci_dev *dev);
1169 int pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, int nvec);
1170 void pci_msix_shutdown(struct pci_dev *dev);
1171 void pci_disable_msix(struct pci_dev *dev);
1172 void msi_remove_pci_irq_vectors(struct pci_dev *dev);
1173 void pci_restore_msi_state(struct pci_dev *dev);
1174 int pci_msi_enabled(void);
1177 #ifdef CONFIG_PCIEPORTBUS
1178 extern bool pcie_ports_disabled;
1179 extern bool pcie_ports_auto;
1181 #define pcie_ports_disabled true
1182 #define pcie_ports_auto false
1185 #ifndef CONFIG_PCIEASPM
1186 static inline int pcie_aspm_enabled(void) { return 0; }
1187 static inline bool pcie_aspm_support_enabled(void) { return false; }
1189 int pcie_aspm_enabled(void);
1190 bool pcie_aspm_support_enabled(void);
1193 #ifdef CONFIG_PCIEAER
1194 void pci_no_aer(void);
1195 bool pci_aer_available(void);
1197 static inline void pci_no_aer(void) { }
1198 static inline bool pci_aer_available(void) { return false; }
1201 #ifndef CONFIG_PCIE_ECRC
1202 static inline void pcie_set_ecrc_checking(struct pci_dev *dev)
1206 static inline void pcie_ecrc_get_policy(char *str) {};
1208 void pcie_set_ecrc_checking(struct pci_dev *dev);
1209 void pcie_ecrc_get_policy(char *str);
1212 #define pci_enable_msi(pdev) pci_enable_msi_block(pdev, 1)
1214 #ifdef CONFIG_HT_IRQ
1215 /* The functions a driver should call */
1216 int ht_create_irq(struct pci_dev *dev, int idx);
1217 void ht_destroy_irq(unsigned int irq);
1218 #endif /* CONFIG_HT_IRQ */
1220 void pci_cfg_access_lock(struct pci_dev *dev);
1221 bool pci_cfg_access_trylock(struct pci_dev *dev);
1222 void pci_cfg_access_unlock(struct pci_dev *dev);
1225 * PCI domain support. Sometimes called PCI segment (eg by ACPI),
1226 * a PCI domain is defined to be a set of PCI busses which share
1227 * configuration space.
1229 #ifdef CONFIG_PCI_DOMAINS
1230 extern int pci_domains_supported;
1232 enum { pci_domains_supported = 0 };
1233 static inline int pci_domain_nr(struct pci_bus *bus)
1238 static inline int pci_proc_domain(struct pci_bus *bus)
1242 #endif /* CONFIG_PCI_DOMAINS */
1244 /* some architectures require additional setup to direct VGA traffic */
1245 typedef int (*arch_set_vga_state_t)(struct pci_dev *pdev, bool decode,
1246 unsigned int command_bits, u32 flags);
1247 void pci_register_set_vga_state(arch_set_vga_state_t func);
1249 #else /* CONFIG_PCI is not enabled */
1252 * If the system does not have PCI, clearly these return errors. Define
1253 * these as simple inline functions to avoid hair in drivers.
1256 #define _PCI_NOP(o, s, t) \
1257 static inline int pci_##o##_config_##s(struct pci_dev *dev, \
1259 { return PCIBIOS_FUNC_NOT_SUPPORTED; }
1261 #define _PCI_NOP_ALL(o, x) _PCI_NOP(o, byte, u8 x) \
1262 _PCI_NOP(o, word, u16 x) \
1263 _PCI_NOP(o, dword, u32 x)
1264 _PCI_NOP_ALL(read, *)
1265 _PCI_NOP_ALL(write,)
1267 static inline struct pci_dev *pci_get_device(unsigned int vendor,
1268 unsigned int device,
1269 struct pci_dev *from)
1274 static inline struct pci_dev *pci_get_subsys(unsigned int vendor,
1275 unsigned int device,
1276 unsigned int ss_vendor,
1277 unsigned int ss_device,
1278 struct pci_dev *from)
1283 static inline struct pci_dev *pci_get_class(unsigned int class,
1284 struct pci_dev *from)
1289 #define pci_dev_present(ids) (0)
1290 #define no_pci_devices() (1)
1291 #define pci_dev_put(dev) do { } while (0)
1293 static inline void pci_set_master(struct pci_dev *dev)
1296 static inline int pci_enable_device(struct pci_dev *dev)
1301 static inline void pci_disable_device(struct pci_dev *dev)
1304 static inline int pci_set_dma_mask(struct pci_dev *dev, u64 mask)
1309 static inline int pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask)
1314 static inline int pci_set_dma_max_seg_size(struct pci_dev *dev,
1320 static inline int pci_set_dma_seg_boundary(struct pci_dev *dev,
1326 static inline int pci_assign_resource(struct pci_dev *dev, int i)
1331 static inline int __pci_register_driver(struct pci_driver *drv,
1332 struct module *owner)
1337 static inline int pci_register_driver(struct pci_driver *drv)
1342 static inline void pci_unregister_driver(struct pci_driver *drv)
1345 static inline int pci_find_capability(struct pci_dev *dev, int cap)
1350 static inline int pci_find_next_capability(struct pci_dev *dev, u8 post,
1356 static inline int pci_find_ext_capability(struct pci_dev *dev, int cap)
1361 /* Power management related routines */
1362 static inline int pci_save_state(struct pci_dev *dev)
1367 static inline void pci_restore_state(struct pci_dev *dev)
1370 static inline int pci_set_power_state(struct pci_dev *dev, pci_power_t state)
1375 static inline int pci_wake_from_d3(struct pci_dev *dev, bool enable)
1380 static inline pci_power_t pci_choose_state(struct pci_dev *dev,
1386 static inline int pci_enable_wake(struct pci_dev *dev, pci_power_t state,
1392 static inline void pci_enable_ido(struct pci_dev *dev, unsigned long type)
1396 static inline void pci_disable_ido(struct pci_dev *dev, unsigned long type)
1400 static inline int pci_enable_obff(struct pci_dev *dev, unsigned long type)
1405 static inline void pci_disable_obff(struct pci_dev *dev)
1409 static inline int pci_request_regions(struct pci_dev *dev, const char *res_name)
1414 static inline void pci_release_regions(struct pci_dev *dev)
1417 #define pci_dma_burst_advice(pdev, strat, strategy_parameter) do { } while (0)
1419 static inline void pci_block_cfg_access(struct pci_dev *dev)
1422 static inline int pci_block_cfg_access_in_atomic(struct pci_dev *dev)
1425 static inline void pci_unblock_cfg_access(struct pci_dev *dev)
1428 static inline struct pci_bus *pci_find_next_bus(const struct pci_bus *from)
1431 static inline struct pci_dev *pci_get_slot(struct pci_bus *bus,
1435 static inline struct pci_dev *pci_get_bus_and_slot(unsigned int bus,
1439 static inline int pci_domain_nr(struct pci_bus *bus)
1442 static inline struct pci_dev *pci_dev_get(struct pci_dev *dev)
1445 #define dev_is_pci(d) (false)
1446 #define dev_is_pf(d) (false)
1447 #define dev_num_vf(d) (0)
1448 #endif /* CONFIG_PCI */
1450 /* Include architecture-dependent settings and functions */
1452 #include <asm/pci.h>
1454 #ifndef PCIBIOS_MAX_MEM_32
1455 #define PCIBIOS_MAX_MEM_32 (-1)
1458 /* these helpers provide future and backwards compatibility
1459 * for accessing popular PCI BAR info */
1460 #define pci_resource_start(dev, bar) ((dev)->resource[(bar)].start)
1461 #define pci_resource_end(dev, bar) ((dev)->resource[(bar)].end)
1462 #define pci_resource_flags(dev, bar) ((dev)->resource[(bar)].flags)
1463 #define pci_resource_len(dev,bar) \
1464 ((pci_resource_start((dev), (bar)) == 0 && \
1465 pci_resource_end((dev), (bar)) == \
1466 pci_resource_start((dev), (bar))) ? 0 : \
1468 (pci_resource_end((dev), (bar)) - \
1469 pci_resource_start((dev), (bar)) + 1))
1471 /* Similar to the helpers above, these manipulate per-pci_dev
1472 * driver-specific data. They are really just a wrapper around
1473 * the generic device structure functions of these calls.
1475 static inline void *pci_get_drvdata(struct pci_dev *pdev)
1477 return dev_get_drvdata(&pdev->dev);
1480 static inline void pci_set_drvdata(struct pci_dev *pdev, void *data)
1482 dev_set_drvdata(&pdev->dev, data);
1485 /* If you want to know what to call your pci_dev, ask this function.
1486 * Again, it's a wrapper around the generic device.
1488 static inline const char *pci_name(const struct pci_dev *pdev)
1490 return dev_name(&pdev->dev);
1494 /* Some archs don't want to expose struct resource to userland as-is
1495 * in sysfs and /proc
1497 #ifndef HAVE_ARCH_PCI_RESOURCE_TO_USER
1498 static inline void pci_resource_to_user(const struct pci_dev *dev, int bar,
1499 const struct resource *rsrc, resource_size_t *start,
1500 resource_size_t *end)
1502 *start = rsrc->start;
1505 #endif /* HAVE_ARCH_PCI_RESOURCE_TO_USER */
1509 * The world is not perfect and supplies us with broken PCI devices.
1510 * For at least a part of these bugs we need a work-around, so both
1511 * generic (drivers/pci/quirks.c) and per-architecture code can define
1512 * fixup hooks to be called for particular buggy devices.
1516 u16 vendor; /* You can use PCI_ANY_ID here of course */
1517 u16 device; /* You can use PCI_ANY_ID here of course */
1518 u32 class; /* You can use PCI_ANY_ID here too */
1519 unsigned int class_shift; /* should be 0, 8, 16 */
1520 void (*hook)(struct pci_dev *dev);
1523 enum pci_fixup_pass {
1524 pci_fixup_early, /* Before probing BARs */
1525 pci_fixup_header, /* After reading configuration header */
1526 pci_fixup_final, /* Final phase of device fixups */
1527 pci_fixup_enable, /* pci_enable_device() time */
1528 pci_fixup_resume, /* pci_device_resume() */
1529 pci_fixup_suspend, /* pci_device_suspend */
1530 pci_fixup_resume_early, /* pci_device_resume_early() */
1533 /* Anonymous variables would be nice... */
1534 #define DECLARE_PCI_FIXUP_SECTION(section, name, vendor, device, class, \
1535 class_shift, hook) \
1536 static const struct pci_fixup __pci_fixup_##name __used \
1537 __attribute__((__section__(#section), aligned((sizeof(void *))))) \
1538 = { vendor, device, class, class_shift, hook };
1540 #define DECLARE_PCI_FIXUP_CLASS_EARLY(vendor, device, class, \
1541 class_shift, hook) \
1542 DECLARE_PCI_FIXUP_SECTION(.pci_fixup_early, \
1543 vendor##device##hook, vendor, device, class, class_shift, hook)
1544 #define DECLARE_PCI_FIXUP_CLASS_HEADER(vendor, device, class, \
1545 class_shift, hook) \
1546 DECLARE_PCI_FIXUP_SECTION(.pci_fixup_header, \
1547 vendor##device##hook, vendor, device, class, class_shift, hook)
1548 #define DECLARE_PCI_FIXUP_CLASS_FINAL(vendor, device, class, \
1549 class_shift, hook) \
1550 DECLARE_PCI_FIXUP_SECTION(.pci_fixup_final, \
1551 vendor##device##hook, vendor, device, class, class_shift, hook)
1552 #define DECLARE_PCI_FIXUP_CLASS_ENABLE(vendor, device, class, \
1553 class_shift, hook) \
1554 DECLARE_PCI_FIXUP_SECTION(.pci_fixup_enable, \
1555 vendor##device##hook, vendor, device, class, class_shift, hook)
1556 #define DECLARE_PCI_FIXUP_CLASS_RESUME(vendor, device, class, \
1557 class_shift, hook) \
1558 DECLARE_PCI_FIXUP_SECTION(.pci_fixup_resume, \
1559 resume##vendor##device##hook, vendor, device, class, \
1561 #define DECLARE_PCI_FIXUP_CLASS_RESUME_EARLY(vendor, device, class, \
1562 class_shift, hook) \
1563 DECLARE_PCI_FIXUP_SECTION(.pci_fixup_resume_early, \
1564 resume_early##vendor##device##hook, vendor, device, \
1565 class, class_shift, hook)
1566 #define DECLARE_PCI_FIXUP_CLASS_SUSPEND(vendor, device, class, \
1567 class_shift, hook) \
1568 DECLARE_PCI_FIXUP_SECTION(.pci_fixup_suspend, \
1569 suspend##vendor##device##hook, vendor, device, class, \
1572 #define DECLARE_PCI_FIXUP_EARLY(vendor, device, hook) \
1573 DECLARE_PCI_FIXUP_SECTION(.pci_fixup_early, \
1574 vendor##device##hook, vendor, device, PCI_ANY_ID, 0, hook)
1575 #define DECLARE_PCI_FIXUP_HEADER(vendor, device, hook) \
1576 DECLARE_PCI_FIXUP_SECTION(.pci_fixup_header, \
1577 vendor##device##hook, vendor, device, PCI_ANY_ID, 0, hook)
1578 #define DECLARE_PCI_FIXUP_FINAL(vendor, device, hook) \
1579 DECLARE_PCI_FIXUP_SECTION(.pci_fixup_final, \
1580 vendor##device##hook, vendor, device, PCI_ANY_ID, 0, hook)
1581 #define DECLARE_PCI_FIXUP_ENABLE(vendor, device, hook) \
1582 DECLARE_PCI_FIXUP_SECTION(.pci_fixup_enable, \
1583 vendor##device##hook, vendor, device, PCI_ANY_ID, 0, hook)
1584 #define DECLARE_PCI_FIXUP_RESUME(vendor, device, hook) \
1585 DECLARE_PCI_FIXUP_SECTION(.pci_fixup_resume, \
1586 resume##vendor##device##hook, vendor, device, \
1587 PCI_ANY_ID, 0, hook)
1588 #define DECLARE_PCI_FIXUP_RESUME_EARLY(vendor, device, hook) \
1589 DECLARE_PCI_FIXUP_SECTION(.pci_fixup_resume_early, \
1590 resume_early##vendor##device##hook, vendor, device, \
1591 PCI_ANY_ID, 0, hook)
1592 #define DECLARE_PCI_FIXUP_SUSPEND(vendor, device, hook) \
1593 DECLARE_PCI_FIXUP_SECTION(.pci_fixup_suspend, \
1594 suspend##vendor##device##hook, vendor, device, \
1595 PCI_ANY_ID, 0, hook)
1597 #ifdef CONFIG_PCI_QUIRKS
1598 void pci_fixup_device(enum pci_fixup_pass pass, struct pci_dev *dev);
1599 struct pci_dev *pci_get_dma_source(struct pci_dev *dev);
1600 int pci_dev_specific_acs_enabled(struct pci_dev *dev, u16 acs_flags);
1602 static inline void pci_fixup_device(enum pci_fixup_pass pass,
1603 struct pci_dev *dev) {}
1604 static inline struct pci_dev *pci_get_dma_source(struct pci_dev *dev)
1606 return pci_dev_get(dev);
1608 static inline int pci_dev_specific_acs_enabled(struct pci_dev *dev,
1615 void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen);
1616 void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr);
1617 void __iomem * const *pcim_iomap_table(struct pci_dev *pdev);
1618 int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name);
1619 int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
1621 void pcim_iounmap_regions(struct pci_dev *pdev, int mask);
1623 extern int pci_pci_problems;
1624 #define PCIPCI_FAIL 1 /* No PCI PCI DMA */
1625 #define PCIPCI_TRITON 2
1626 #define PCIPCI_NATOMA 4
1627 #define PCIPCI_VIAETBF 8
1628 #define PCIPCI_VSFX 16
1629 #define PCIPCI_ALIMAGIK 32 /* Need low latency setting */
1630 #define PCIAGP_FAIL 64 /* No PCI to AGP DMA */
1632 extern unsigned long pci_cardbus_io_size;
1633 extern unsigned long pci_cardbus_mem_size;
1634 extern u8 pci_dfl_cache_line_size;
1635 extern u8 pci_cache_line_size;
1637 extern unsigned long pci_hotplug_io_size;
1638 extern unsigned long pci_hotplug_mem_size;
1640 /* Architecture specific versions may override these (weak) */
1641 int pcibios_add_platform_entries(struct pci_dev *dev);
1642 void pcibios_disable_device(struct pci_dev *dev);
1643 void pcibios_set_master(struct pci_dev *dev);
1644 int pcibios_set_pcie_reset_state(struct pci_dev *dev,
1645 enum pcie_reset_state state);
1646 int pcibios_add_device(struct pci_dev *dev);
1648 #ifdef CONFIG_PCI_MMCONFIG
1649 void __init pci_mmcfg_early_init(void);
1650 void __init pci_mmcfg_late_init(void);
1652 static inline void pci_mmcfg_early_init(void) { }
1653 static inline void pci_mmcfg_late_init(void) { }
1656 int pci_ext_cfg_avail(void);
1658 void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar);
1660 #ifdef CONFIG_PCI_IOV
1661 int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn);
1662 void pci_disable_sriov(struct pci_dev *dev);
1663 irqreturn_t pci_sriov_migration(struct pci_dev *dev);
1664 int pci_num_vf(struct pci_dev *dev);
1665 int pci_vfs_assigned(struct pci_dev *dev);
1666 int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs);
1667 int pci_sriov_get_totalvfs(struct pci_dev *dev);
1669 static inline int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
1673 static inline void pci_disable_sriov(struct pci_dev *dev)
1676 static inline irqreturn_t pci_sriov_migration(struct pci_dev *dev)
1680 static inline int pci_num_vf(struct pci_dev *dev)
1684 static inline int pci_vfs_assigned(struct pci_dev *dev)
1688 static inline int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs)
1692 static inline int pci_sriov_get_totalvfs(struct pci_dev *dev)
1698 #if defined(CONFIG_HOTPLUG_PCI) || defined(CONFIG_HOTPLUG_PCI_MODULE)
1699 void pci_hp_create_module_link(struct pci_slot *pci_slot);
1700 void pci_hp_remove_module_link(struct pci_slot *pci_slot);
1704 * pci_pcie_cap - get the saved PCIe capability offset
1707 * PCIe capability offset is calculated at PCI device initialization
1708 * time and saved in the data structure. This function returns saved
1709 * PCIe capability offset. Using this instead of pci_find_capability()
1710 * reduces unnecessary search in the PCI configuration space. If you
1711 * need to calculate PCIe capability offset from raw device for some
1712 * reasons, please use pci_find_capability() instead.
1714 static inline int pci_pcie_cap(struct pci_dev *dev)
1716 return dev->pcie_cap;
1720 * pci_is_pcie - check if the PCI device is PCI Express capable
1723 * Retrun true if the PCI device is PCI Express capable, false otherwise.
1725 static inline bool pci_is_pcie(struct pci_dev *dev)
1727 return !!pci_pcie_cap(dev);
1731 * pcie_caps_reg - get the PCIe Capabilities Register
1734 static inline u16 pcie_caps_reg(const struct pci_dev *dev)
1736 return dev->pcie_flags_reg;
1740 * pci_pcie_type - get the PCIe device/port type
1743 static inline int pci_pcie_type(const struct pci_dev *dev)
1745 return (pcie_caps_reg(dev) & PCI_EXP_FLAGS_TYPE) >> 4;
1748 void pci_request_acs(void);
1749 bool pci_acs_enabled(struct pci_dev *pdev, u16 acs_flags);
1750 bool pci_acs_path_enabled(struct pci_dev *start,
1751 struct pci_dev *end, u16 acs_flags);
1753 #define PCI_VPD_LRDT 0x80 /* Large Resource Data Type */
1754 #define PCI_VPD_LRDT_ID(x) (x | PCI_VPD_LRDT)
1756 /* Large Resource Data Type Tag Item Names */
1757 #define PCI_VPD_LTIN_ID_STRING 0x02 /* Identifier String */
1758 #define PCI_VPD_LTIN_RO_DATA 0x10 /* Read-Only Data */
1759 #define PCI_VPD_LTIN_RW_DATA 0x11 /* Read-Write Data */
1761 #define PCI_VPD_LRDT_ID_STRING PCI_VPD_LRDT_ID(PCI_VPD_LTIN_ID_STRING)
1762 #define PCI_VPD_LRDT_RO_DATA PCI_VPD_LRDT_ID(PCI_VPD_LTIN_RO_DATA)
1763 #define PCI_VPD_LRDT_RW_DATA PCI_VPD_LRDT_ID(PCI_VPD_LTIN_RW_DATA)
1765 /* Small Resource Data Type Tag Item Names */
1766 #define PCI_VPD_STIN_END 0x78 /* End */
1768 #define PCI_VPD_SRDT_END PCI_VPD_STIN_END
1770 #define PCI_VPD_SRDT_TIN_MASK 0x78
1771 #define PCI_VPD_SRDT_LEN_MASK 0x07
1773 #define PCI_VPD_LRDT_TAG_SIZE 3
1774 #define PCI_VPD_SRDT_TAG_SIZE 1
1776 #define PCI_VPD_INFO_FLD_HDR_SIZE 3
1778 #define PCI_VPD_RO_KEYWORD_PARTNO "PN"
1779 #define PCI_VPD_RO_KEYWORD_MFR_ID "MN"
1780 #define PCI_VPD_RO_KEYWORD_VENDOR0 "V0"
1781 #define PCI_VPD_RO_KEYWORD_CHKSUM "RV"
1784 * pci_vpd_lrdt_size - Extracts the Large Resource Data Type length
1785 * @lrdt: Pointer to the beginning of the Large Resource Data Type tag
1787 * Returns the extracted Large Resource Data Type length.
1789 static inline u16 pci_vpd_lrdt_size(const u8 *lrdt)
1791 return (u16)lrdt[1] + ((u16)lrdt[2] << 8);
1795 * pci_vpd_srdt_size - Extracts the Small Resource Data Type length
1796 * @lrdt: Pointer to the beginning of the Small Resource Data Type tag
1798 * Returns the extracted Small Resource Data Type length.
1800 static inline u8 pci_vpd_srdt_size(const u8 *srdt)
1802 return (*srdt) & PCI_VPD_SRDT_LEN_MASK;
1806 * pci_vpd_info_field_size - Extracts the information field length
1807 * @lrdt: Pointer to the beginning of an information field header
1809 * Returns the extracted information field length.
1811 static inline u8 pci_vpd_info_field_size(const u8 *info_field)
1813 return info_field[2];
1817 * pci_vpd_find_tag - Locates the Resource Data Type tag provided
1818 * @buf: Pointer to buffered vpd data
1819 * @off: The offset into the buffer at which to begin the search
1820 * @len: The length of the vpd buffer
1821 * @rdt: The Resource Data Type to search for
1823 * Returns the index where the Resource Data Type was found or
1824 * -ENOENT otherwise.
1826 int pci_vpd_find_tag(const u8 *buf, unsigned int off, unsigned int len, u8 rdt);
1829 * pci_vpd_find_info_keyword - Locates an information field keyword in the VPD
1830 * @buf: Pointer to buffered vpd data
1831 * @off: The offset into the buffer at which to begin the search
1832 * @len: The length of the buffer area, relative to off, in which to search
1833 * @kw: The keyword to search for
1835 * Returns the index where the information field keyword was found or
1836 * -ENOENT otherwise.
1838 int pci_vpd_find_info_keyword(const u8 *buf, unsigned int off,
1839 unsigned int len, const char *kw);
1841 /* PCI <-> OF binding helpers */
1844 void pci_set_of_node(struct pci_dev *dev);
1845 void pci_release_of_node(struct pci_dev *dev);
1846 void pci_set_bus_of_node(struct pci_bus *bus);
1847 void pci_release_bus_of_node(struct pci_bus *bus);
1849 /* Arch may override this (weak) */
1850 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus);
1852 static inline struct device_node *
1853 pci_device_to_OF_node(const struct pci_dev *pdev)
1855 return pdev ? pdev->dev.of_node : NULL;
1858 static inline struct device_node *pci_bus_to_OF_node(struct pci_bus *bus)
1860 return bus ? bus->dev.of_node : NULL;
1863 #else /* CONFIG_OF */
1864 static inline void pci_set_of_node(struct pci_dev *dev) { }
1865 static inline void pci_release_of_node(struct pci_dev *dev) { }
1866 static inline void pci_set_bus_of_node(struct pci_bus *bus) { }
1867 static inline void pci_release_bus_of_node(struct pci_bus *bus) { }
1868 #endif /* CONFIG_OF */
1871 static inline struct eeh_dev *pci_dev_to_eeh_dev(struct pci_dev *pdev)
1873 return pdev->dev.archdata.edev;
1878 * pci_find_upstream_pcie_bridge - find upstream PCIe-to-PCI bridge of a device
1879 * @pdev: the PCI device
1881 * if the device is PCIE, return NULL
1882 * if the device isn't connected to a PCIe bridge (that is its parent is a
1883 * legacy PCI bridge and the bridge is directly connected to bus 0), return its
1886 struct pci_dev *pci_find_upstream_pcie_bridge(struct pci_dev *pdev);
1888 #endif /* LINUX_PCI_H */