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Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -04001/*
2 * PCI Backend Common Data Structures & Function Declarations
3 *
4 * Author: Ryan Wilson <hap9@epoch.ncsc.mil>
5 */
6#ifndef __XEN_PCIBACK_H__
7#define __XEN_PCIBACK_H__
8
9#include <linux/pci.h>
10#include <linux/interrupt.h>
11#include <xen/xenbus.h>
12#include <linux/list.h>
13#include <linux/spinlock.h>
14#include <linux/workqueue.h>
Konrad Rzeszutek Wilk8bfd4e02011-07-19 20:09:43 -040015#include <linux/atomic.h>
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -040016#include <xen/interface/io/pciif.h>
17
Jan Beulich402c5e12011-09-21 16:22:11 -040018#define DRV_NAME "xen-pciback"
19
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -040020struct pci_dev_entry {
21 struct list_head list;
22 struct pci_dev *dev;
23};
24
Konrad Rzeszutek Wilk8bfd4e02011-07-19 20:09:43 -040025#define _PDEVF_op_active (0)
26#define PDEVF_op_active (1<<(_PDEVF_op_active))
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -040027#define _PCIB_op_pending (1)
28#define PCIB_op_pending (1<<(_PCIB_op_pending))
29
Konrad Rzeszutek Wilka92336a2011-07-19 19:40:51 -040030struct xen_pcibk_device {
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -040031 void *pci_dev_data;
Konrad Rzeszutek Wilkb1766b62011-09-16 14:43:14 -040032 struct mutex dev_lock;
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -040033 struct xenbus_device *xdev;
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -040034 struct xenbus_watch be_watch;
35 u8 be_watching;
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -040036 int evtchn_irq;
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -040037 struct xen_pci_sharedinfo *sh_info;
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -040038 unsigned long flags;
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -040039 struct work_struct op_work;
40};
41
Konrad Rzeszutek Wilka92336a2011-07-19 19:40:51 -040042struct xen_pcibk_dev_data {
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -040043 struct list_head config_fields;
Konrad Rzeszutek Wilkcd9db802012-01-04 14:30:58 -050044 struct pci_saved_state *pci_saved_state;
Konrad Rzeszutek Wilk0513fe92011-07-19 18:56:39 -040045 unsigned int permissive:1;
46 unsigned int warned_on_write:1;
47 unsigned int enable_intx:1;
48 unsigned int isr_on:1; /* Whether the IRQ handler is installed. */
49 unsigned int ack_intr:1; /* .. and ACK-ing */
50 unsigned long handled;
51 unsigned int irq; /* Saved in case device transitions to MSI/MSI-X */
Konrad Rzeszutek Wilka92336a2011-07-19 19:40:51 -040052 char irq_name[0]; /* xen-pcibk[000:04:00.0] */
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -040053};
54
Konrad Rzeszutek Wilka92336a2011-07-19 19:40:51 -040055/* Used by XenBus and xen_pcibk_ops.c */
56extern wait_queue_head_t xen_pcibk_aer_wait_queue;
57extern struct workqueue_struct *xen_pcibk_wq;
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -040058/* Used by pcistub.c and conf_space_quirks.c */
Konrad Rzeszutek Wilka92336a2011-07-19 19:40:51 -040059extern struct list_head xen_pcibk_quirks;
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -040060
61/* Get/Put PCI Devices that are hidden from the PCI Backend Domain */
Konrad Rzeszutek Wilka92336a2011-07-19 19:40:51 -040062struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev,
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -040063 int domain, int bus,
64 int slot, int func);
Konrad Rzeszutek Wilka92336a2011-07-19 19:40:51 -040065struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev,
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -040066 struct pci_dev *dev);
67void pcistub_put_pci_dev(struct pci_dev *dev);
68
69/* Ensure a device is turned off or reset */
Konrad Rzeszutek Wilka92336a2011-07-19 19:40:51 -040070void xen_pcibk_reset_device(struct pci_dev *pdev);
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -040071
72/* Access a virtual configuration space for a PCI device */
Konrad Rzeszutek Wilka92336a2011-07-19 19:40:51 -040073int xen_pcibk_config_init(void);
74int xen_pcibk_config_init_dev(struct pci_dev *dev);
75void xen_pcibk_config_free_dyn_fields(struct pci_dev *dev);
76void xen_pcibk_config_reset_dev(struct pci_dev *dev);
77void xen_pcibk_config_free_dev(struct pci_dev *dev);
78int xen_pcibk_config_read(struct pci_dev *dev, int offset, int size,
79 u32 *ret_val);
80int xen_pcibk_config_write(struct pci_dev *dev, int offset, int size,
81 u32 value);
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -040082
83/* Handle requests for specific devices from the frontend */
Konrad Rzeszutek Wilka92336a2011-07-19 19:40:51 -040084typedef int (*publish_pci_dev_cb) (struct xen_pcibk_device *pdev,
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -040085 unsigned int domain, unsigned int bus,
86 unsigned int devfn, unsigned int devid);
Konrad Rzeszutek Wilka92336a2011-07-19 19:40:51 -040087typedef int (*publish_pci_root_cb) (struct xen_pcibk_device *pdev,
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -040088 unsigned int domain, unsigned int bus);
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -040089
Konrad Rzeszutek Wilk2ebdc422011-07-11 16:49:41 -040090/* Backend registration for the two types of BDF representation:
91 * vpci - BDFs start at 00
92 * passthrough - BDFs are exactly like in the host.
93 */
94struct xen_pcibk_backend {
Jan Beulich402c5e12011-09-21 16:22:11 -040095 const char *name;
Konrad Rzeszutek Wilk2ebdc422011-07-11 16:49:41 -040096 int (*init)(struct xen_pcibk_device *pdev);
97 void (*free)(struct xen_pcibk_device *pdev);
98 int (*find)(struct pci_dev *pcidev, struct xen_pcibk_device *pdev,
99 unsigned int *domain, unsigned int *bus,
100 unsigned int *devfn);
101 int (*publish)(struct xen_pcibk_device *pdev, publish_pci_root_cb cb);
102 void (*release)(struct xen_pcibk_device *pdev, struct pci_dev *dev);
103 int (*add)(struct xen_pcibk_device *pdev, struct pci_dev *dev,
104 int devid, publish_pci_dev_cb publish_cb);
105 struct pci_dev *(*get)(struct xen_pcibk_device *pdev,
106 unsigned int domain, unsigned int bus,
107 unsigned int devfn);
108};
109
Jan Beulich402c5e12011-09-21 16:22:11 -0400110extern const struct xen_pcibk_backend xen_pcibk_vpci_backend;
111extern const struct xen_pcibk_backend xen_pcibk_passthrough_backend;
112extern const struct xen_pcibk_backend *xen_pcibk_backend;
Konrad Rzeszutek Wilk2ebdc422011-07-11 16:49:41 -0400113
114static inline int xen_pcibk_add_pci_dev(struct xen_pcibk_device *pdev,
115 struct pci_dev *dev,
116 int devid,
117 publish_pci_dev_cb publish_cb)
118{
119 if (xen_pcibk_backend && xen_pcibk_backend->add)
120 return xen_pcibk_backend->add(pdev, dev, devid, publish_cb);
121 return -1;
Jan Beulich402c5e12011-09-21 16:22:11 -0400122}
123
Konrad Rzeszutek Wilk2ebdc422011-07-11 16:49:41 -0400124static inline void xen_pcibk_release_pci_dev(struct xen_pcibk_device *pdev,
125 struct pci_dev *dev)
126{
Yang Zhang6337a232012-11-22 10:20:23 +0800127 if (xen_pcibk_backend && xen_pcibk_backend->release)
Konrad Rzeszutek Wilk2ebdc422011-07-11 16:49:41 -0400128 return xen_pcibk_backend->release(pdev, dev);
Jan Beulich402c5e12011-09-21 16:22:11 -0400129}
Konrad Rzeszutek Wilk2ebdc422011-07-11 16:49:41 -0400130
131static inline struct pci_dev *
132xen_pcibk_get_pci_dev(struct xen_pcibk_device *pdev, unsigned int domain,
133 unsigned int bus, unsigned int devfn)
134{
135 if (xen_pcibk_backend && xen_pcibk_backend->get)
136 return xen_pcibk_backend->get(pdev, domain, bus, devfn);
137 return NULL;
Jan Beulich402c5e12011-09-21 16:22:11 -0400138}
139
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -0400140/**
Konrad Rzeszutek Wilka92336a2011-07-19 19:40:51 -0400141* Add for domain0 PCIE-AER handling. Get guest domain/bus/devfn in xen_pcibk
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -0400142* before sending aer request to pcifront, so that guest could identify
Konrad Rzeszutek Wilka92336a2011-07-19 19:40:51 -0400143* device, coopearte with xen_pcibk to finish aer recovery job if device driver
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -0400144* has the capability
145*/
Konrad Rzeszutek Wilk2ebdc422011-07-11 16:49:41 -0400146static inline int xen_pcibk_get_pcifront_dev(struct pci_dev *pcidev,
147 struct xen_pcibk_device *pdev,
148 unsigned int *domain,
149 unsigned int *bus,
150 unsigned int *devfn)
151{
152 if (xen_pcibk_backend && xen_pcibk_backend->find)
153 return xen_pcibk_backend->find(pcidev, pdev, domain, bus,
154 devfn);
155 return -1;
Jan Beulich402c5e12011-09-21 16:22:11 -0400156}
157
Konrad Rzeszutek Wilk2ebdc422011-07-11 16:49:41 -0400158static inline int xen_pcibk_init_devices(struct xen_pcibk_device *pdev)
159{
160 if (xen_pcibk_backend && xen_pcibk_backend->init)
161 return xen_pcibk_backend->init(pdev);
162 return -1;
Jan Beulich402c5e12011-09-21 16:22:11 -0400163}
164
Konrad Rzeszutek Wilk2ebdc422011-07-11 16:49:41 -0400165static inline int xen_pcibk_publish_pci_roots(struct xen_pcibk_device *pdev,
166 publish_pci_root_cb cb)
167{
168 if (xen_pcibk_backend && xen_pcibk_backend->publish)
169 return xen_pcibk_backend->publish(pdev, cb);
170 return -1;
Jan Beulich402c5e12011-09-21 16:22:11 -0400171}
172
Konrad Rzeszutek Wilk2ebdc422011-07-11 16:49:41 -0400173static inline void xen_pcibk_release_devices(struct xen_pcibk_device *pdev)
174{
175 if (xen_pcibk_backend && xen_pcibk_backend->free)
176 return xen_pcibk_backend->free(pdev);
Jan Beulich402c5e12011-09-21 16:22:11 -0400177}
178
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -0400179/* Handles events from front-end */
Konrad Rzeszutek Wilka92336a2011-07-19 19:40:51 -0400180irqreturn_t xen_pcibk_handle_event(int irq, void *dev_id);
181void xen_pcibk_do_op(struct work_struct *data);
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -0400182
Konrad Rzeszutek Wilka92336a2011-07-19 19:40:51 -0400183int xen_pcibk_xenbus_register(void);
184void xen_pcibk_xenbus_unregister(void);
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -0400185
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -0400186extern int verbose_request;
187
Konrad Rzeszutek Wilka92336a2011-07-19 19:40:51 -0400188void xen_pcibk_test_and_schedule_op(struct xen_pcibk_device *pdev);
Konrad Rzeszutek Wilk30edc142009-10-13 17:22:20 -0400189#endif
190
Konrad Rzeszutek Wilk0513fe92011-07-19 18:56:39 -0400191/* Handles shared IRQs that can to device domain and control domain. */
Konrad Rzeszutek Wilka92336a2011-07-19 19:40:51 -0400192void xen_pcibk_irq_handler(struct pci_dev *dev, int reset);