2 * PCI Backend Common Data Structures & Function Declarations
4 * Author: Ryan Wilson <hap9@epoch.ncsc.mil>
6 #ifndef __XEN_PCIBACK_H__
7 #define __XEN_PCIBACK_H__
10 #include <linux/interrupt.h>
11 #include <xen/xenbus.h>
12 #include <linux/list.h>
13 #include <linux/mutex.h>
14 #include <linux/workqueue.h>
15 #include <linux/atomic.h>
16 #include <xen/interface/io/pciif.h>
19 #define DRV_NAME "xen-pciback"
21 #define DRV_NAME "pciback"
24 struct pci_dev_entry {
25 struct list_head list;
29 #define _PDEVF_op_active (0)
30 #define PDEVF_op_active (1<<(_PDEVF_op_active))
31 #define _PCIB_op_pending (1)
32 #define PCIB_op_pending (1<<(_PCIB_op_pending))
34 struct xen_pcibk_device {
36 struct mutex dev_lock;
37 struct xenbus_device *xdev;
38 struct xenbus_watch be_watch;
42 struct vm_struct *sh_area;
44 struct xen_pci_sharedinfo *sh_info;
46 struct work_struct op_work;
49 struct xen_pcibk_dev_data {
50 struct list_head config_fields;
51 unsigned int permissive:1;
52 unsigned int warned_on_write:1;
54 unsigned int enable_intx:1;
55 unsigned int isr_on:1; /* Whether the IRQ handler is installed. */
56 unsigned int ack_intr:1; /* .. and ACK-ing */
57 unsigned long handled;
58 unsigned int irq; /* Saved in case device transitions to MSI/MSI-X */
59 char irq_name[0]; /* xen-pcibk[000:04:00.0] */
63 /* Used by XenBus and xen_pcibk_ops.c */
64 extern wait_queue_head_t xen_pcibk_aer_wait_queue;
65 extern struct workqueue_struct *xen_pcibk_wq;
66 /* Used by pcistub.c and conf_space_quirks.c */
67 extern struct list_head xen_pcibk_quirks;
69 /* Get/Put PCI Devices that are hidden from the PCI Backend Domain */
70 struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev,
73 struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev,
75 void pcistub_put_pci_dev(struct pci_dev *dev);
77 /* Ensure a device is turned off or reset */
78 void xen_pcibk_reset_device(struct pci_dev *pdev);
80 /* Access a virtual configuration space for a PCI device */
81 int xen_pcibk_config_init(void);
82 int xen_pcibk_config_init_dev(struct pci_dev *dev);
83 void xen_pcibk_config_free_dyn_fields(struct pci_dev *dev);
84 void xen_pcibk_config_reset_dev(struct pci_dev *dev);
85 void xen_pcibk_config_free_dev(struct pci_dev *dev);
86 int xen_pcibk_config_read(struct pci_dev *dev, int offset, int size,
88 int xen_pcibk_config_write(struct pci_dev *dev, int offset, int size,
91 /* Handle requests for specific devices from the frontend */
92 typedef int (*publish_pci_dev_cb) (struct xen_pcibk_device *pdev,
93 unsigned int domain, unsigned int bus,
94 unsigned int devfn, unsigned int devid);
95 typedef int (*publish_pci_root_cb) (struct xen_pcibk_device *pdev,
96 unsigned int domain, unsigned int bus);
98 /* Backend registration for the different types of BDF representation:
99 * vpci - BDFs start at 00
100 * passthrough - BDFs are exactly like in the host.
101 * slot - like vpci, but each function becoming a separate slot
102 * controller - devices on same host bus will also be on same virtual bus
104 struct xen_pcibk_backend {
106 int (*init)(struct xen_pcibk_device *pdev);
107 void (*free)(struct xen_pcibk_device *pdev);
108 int (*find)(struct pci_dev *pcidev, struct xen_pcibk_device *pdev,
109 unsigned int *domain, unsigned int *bus,
110 unsigned int *devfn);
111 int (*publish)(struct xen_pcibk_device *pdev, publish_pci_root_cb cb);
112 void (*release)(struct xen_pcibk_device *pdev, struct pci_dev *dev);
113 int (*add)(struct xen_pcibk_device *pdev, struct pci_dev *dev,
114 int devid, publish_pci_dev_cb publish_cb);
115 struct pci_dev *(*get)(struct xen_pcibk_device *pdev,
116 unsigned int domain, unsigned int bus,
120 extern const struct xen_pcibk_backend __weak xen_pcibk_vpci_backend;
121 extern const struct xen_pcibk_backend __weak xen_pcibk_passthrough_backend;
122 extern const struct xen_pcibk_backend __weak xen_pcibk_slot_backend;
123 extern const struct xen_pcibk_backend __weak xen_pcibk_controller_backend;
124 extern const struct xen_pcibk_backend *xen_pcibk_backend;
126 static inline int xen_pcibk_add_pci_dev(struct xen_pcibk_device *pdev,
129 publish_pci_dev_cb publish_cb)
131 if (xen_pcibk_backend && xen_pcibk_backend->add)
132 return xen_pcibk_backend->add(pdev, dev, devid, publish_cb);
136 static inline void xen_pcibk_release_pci_dev(struct xen_pcibk_device *pdev,
139 if (xen_pcibk_backend && xen_pcibk_backend->free)
140 return xen_pcibk_backend->release(pdev, dev);
143 static inline struct pci_dev *
144 xen_pcibk_get_pci_dev(struct xen_pcibk_device *pdev, unsigned int domain,
145 unsigned int bus, unsigned int devfn)
147 if (xen_pcibk_backend && xen_pcibk_backend->get)
148 return xen_pcibk_backend->get(pdev, domain, bus, devfn);
153 * Add for domain0 PCIE-AER handling. Get guest domain/bus/devfn in xen_pcibk
154 * before sending aer request to pcifront, so that guest could identify
155 * device, coopearte with xen_pcibk to finish aer recovery job if device driver
158 static inline int xen_pcibk_get_pcifront_dev(struct pci_dev *pcidev,
159 struct xen_pcibk_device *pdev,
160 unsigned int *domain,
164 if (xen_pcibk_backend && xen_pcibk_backend->find)
165 return xen_pcibk_backend->find(pcidev, pdev, domain, bus,
170 static inline int xen_pcibk_init_devices(struct xen_pcibk_device *pdev)
172 if (xen_pcibk_backend && xen_pcibk_backend->init)
173 return xen_pcibk_backend->init(pdev);
177 static inline int xen_pcibk_publish_pci_roots(struct xen_pcibk_device *pdev,
178 publish_pci_root_cb cb)
180 if (xen_pcibk_backend && xen_pcibk_backend->publish)
181 return xen_pcibk_backend->publish(pdev, cb);
185 static inline void xen_pcibk_release_devices(struct xen_pcibk_device *pdev)
187 if (xen_pcibk_backend && xen_pcibk_backend->free)
188 return xen_pcibk_backend->free(pdev);
191 /* Handles events from front-end */
192 irqreturn_t xen_pcibk_handle_event(int irq, void *dev_id);
193 void xen_pcibk_do_op(struct work_struct *data);
195 int xen_pcibk_xenbus_register(void);
196 void xen_pcibk_xenbus_unregister(void);
198 extern int verbose_request;
200 void xen_pcibk_test_and_schedule_op(struct xen_pcibk_device *pdev);
203 /* Handles shared IRQs that can to device domain and control domain. */
204 void xen_pcibk_irq_handler(struct pci_dev *dev, int reset);