ia64/linux-2.6.18-xen.hg

view drivers/pci/pci.h @ 696:2b5cc22ab406

xen/dom0: Reassign memory resources to device for pci passthrough.

This patch adds the function that reassign page-aligned memory
resources, to dom0 linux. The function is useful when we assign I/O
device to HVM domain using pci passthrough.

When we assign a device to HVM domain using pci passthrough,
the device needs to be assigned page-aligned memory resources. If the
memory resource is not page-aligned, following error occurs.

Error: pci: 0000:00:1d.7: non-page-aligned MMIO BAR found.

On many system, BIOS assigns memory resources to the device and
enables it. So my patch disables the device, and releases resources,
Then it assigns page-aligned memory resource to the device.

To reassign resources, please add boot parameters of dom0 linux as
follows.

reassign_resources reassigndev=00:1d.7,01:00.0

reassign_resources
Enables reassigning resources.

reassigndev= Specifies devices include I/O device and
PCI-PCI
bridge to reassign resources. PCI-PCI bridge
can be specified, if resource windows need to
be expanded.

Signed-off-by: Yuji Shimada <shimada-yxb@necst.nec.co.jp>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Oct 09 11:10:43 2008 +0100 (2008-10-09)
parents 831230e53067
children 16c549b3ba59
line source
1 /* Functions internal to the PCI core code */
3 extern int pci_uevent(struct device *dev, char **envp, int num_envp,
4 char *buffer, int buffer_size);
5 extern int pci_create_sysfs_dev_files(struct pci_dev *pdev);
6 extern void pci_remove_sysfs_dev_files(struct pci_dev *pdev);
7 extern void pci_cleanup_rom(struct pci_dev *dev);
8 extern int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
9 resource_size_t size, resource_size_t align,
10 resource_size_t min, unsigned int type_mask,
11 void (*alignf)(void *, struct resource *,
12 resource_size_t, resource_size_t),
13 void *alignf_data);
14 /* Firmware callbacks */
15 extern int (*platform_pci_choose_state)(struct pci_dev *dev, pm_message_t state);
16 extern int (*platform_pci_set_power_state)(struct pci_dev *dev, pci_power_t state);
18 extern int pci_user_read_config_byte(struct pci_dev *dev, int where, u8 *val);
19 extern int pci_user_read_config_word(struct pci_dev *dev, int where, u16 *val);
20 extern int pci_user_read_config_dword(struct pci_dev *dev, int where, u32 *val);
21 extern int pci_user_write_config_byte(struct pci_dev *dev, int where, u8 val);
22 extern int pci_user_write_config_word(struct pci_dev *dev, int where, u16 val);
23 extern int pci_user_write_config_dword(struct pci_dev *dev, int where, u32 val);
25 /* PCI /proc functions */
26 #ifdef CONFIG_PROC_FS
27 extern int pci_proc_attach_device(struct pci_dev *dev);
28 extern int pci_proc_detach_device(struct pci_dev *dev);
29 extern int pci_proc_detach_bus(struct pci_bus *bus);
30 #else
31 static inline int pci_proc_attach_device(struct pci_dev *dev) { return 0; }
32 static inline int pci_proc_detach_device(struct pci_dev *dev) { return 0; }
33 static inline int pci_proc_detach_bus(struct pci_bus *bus) { return 0; }
34 #endif
36 /* Functions for PCI Hotplug drivers to use */
37 extern unsigned int pci_do_scan_bus(struct pci_bus *bus);
38 extern int pci_bus_find_capability (struct pci_bus *bus, unsigned int devfn, int cap);
40 extern void pci_remove_legacy_files(struct pci_bus *bus);
42 /* Lock for read/write access to pci device and bus lists */
43 extern struct rw_semaphore pci_bus_sem;
45 #ifdef CONFIG_X86_IO_APIC
46 extern int pci_msi_quirk;
47 #else
48 #define pci_msi_quirk 0
49 #endif
50 extern unsigned int pci_pm_d3_delay;
51 #ifdef CONFIG_PCI_MSI
52 void disable_msi_mode(struct pci_dev *dev, int pos, int type);
53 void pci_no_msi(void);
54 #else
55 static inline void disable_msi_mode(struct pci_dev *dev, int pos, int type) { }
56 static inline void pci_no_msi(void) { }
57 #endif
58 #if defined(CONFIG_PCI_MSI) && defined(CONFIG_PM)
59 int pci_save_msi_state(struct pci_dev *dev);
60 int pci_save_msix_state(struct pci_dev *dev);
61 void pci_restore_msi_state(struct pci_dev *dev);
62 void pci_restore_msix_state(struct pci_dev *dev);
63 #else
64 static inline int pci_save_msi_state(struct pci_dev *dev) { return 0; }
65 static inline int pci_save_msix_state(struct pci_dev *dev) { return 0; }
66 static inline void pci_restore_msi_state(struct pci_dev *dev) {}
67 static inline void pci_restore_msix_state(struct pci_dev *dev) {}
68 #endif
69 static inline int pci_no_d1d2(struct pci_dev *dev)
70 {
71 unsigned int parent_dstates = 0;
73 if (dev->bus->self)
74 parent_dstates = dev->bus->self->no_d1d2;
75 return (dev->no_d1d2 || parent_dstates);
77 }
78 extern int pcie_mch_quirk;
79 extern struct device_attribute pci_dev_attrs[];
80 extern struct class_device_attribute class_device_attr_cpuaffinity;
82 /**
83 * pci_match_one_device - Tell if a PCI device structure has a matching
84 * PCI device id structure
85 * @id: single PCI device id structure to match
86 * @dev: the PCI device structure to match against
87 *
88 * Returns the matching pci_device_id structure or %NULL if there is no match.
89 */
90 static inline const struct pci_device_id *
91 pci_match_one_device(const struct pci_device_id *id, const struct pci_dev *dev)
92 {
93 if ((id->vendor == PCI_ANY_ID || id->vendor == dev->vendor) &&
94 (id->device == PCI_ANY_ID || id->device == dev->device) &&
95 (id->subvendor == PCI_ANY_ID || id->subvendor == dev->subsystem_vendor) &&
96 (id->subdevice == PCI_ANY_ID || id->subdevice == dev->subsystem_device) &&
97 !((id->class ^ dev->class) & id->class_mask))
98 return id;
99 return NULL;
100 }
102 #define ROUND_UP_TO_PAGESIZE(size) ((size + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1))
104 extern int reassign_resources;
105 extern int is_reassigndev(struct pci_dev *dev);
106 extern void pci_update_bridge(struct pci_dev *dev, int resno);