drivers/xen/xen-pciback/pciback.h

   1 /*
   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>
  15 #include <linux/atomic.h>
  16 #include <xen/interface/io/pciif.h>
  17
  18 struct pci_dev_entry {
  19         struct list_head list;
  20         struct pci_dev *dev;
  21 };
  22
  23 #define _PDEVF_op_active        (0)
  24 #define PDEVF_op_active         (1<<(_PDEVF_op_active))
  25 #define _PCIB_op_pending        (1)
  26 #define PCIB_op_pending         (1<<(_PCIB_op_pending))
  27
  28 struct xen_pcibk_device {
  29         void *pci_dev_data;
  30         spinlock_t dev_lock;
  31         struct xenbus_device *xdev;
  32         struct xenbus_watch be_watch;
  33         u8 be_watching;
  34         int evtchn_irq;
  35         struct xen_pci_sharedinfo *sh_info;
  36         unsigned long flags;
  37         struct work_struct op_work;
  38 };
  39
  40 struct xen_pcibk_dev_data {
  41         struct list_head config_fields;
  42         unsigned int permissive:1;
  43         unsigned int warned_on_write:1;
  44         unsigned int enable_intx:1;
  45         unsigned int isr_on:1; /* Whether the IRQ handler is installed. */
  46         unsigned int ack_intr:1; /* .. and ACK-ing */
  47         unsigned long handled;
  48         unsigned int irq; /* Saved in case device transitions to MSI/MSI-X */
  49         char irq_name[0]; /* xen-pcibk[000:04:00.0] */
  50 };
  51
  52 /* Used by XenBus and xen_pcibk_ops.c */
  53 extern wait_queue_head_t xen_pcibk_aer_wait_queue;
  54 extern struct workqueue_struct *xen_pcibk_wq;
  55 /* Used by pcistub.c and conf_space_quirks.c */
  56 extern struct list_head xen_pcibk_quirks;
  57
  58 /* Get/Put PCI Devices that are hidden from the PCI Backend Domain */
  59 struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev,
  60                                             int domain, int bus,
  61                                             int slot, int func);
  62 struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev,
  63                                     struct pci_dev *dev);
  64 void pcistub_put_pci_dev(struct pci_dev *dev);
  65
  66 /* Ensure a device is turned off or reset */
  67 void xen_pcibk_reset_device(struct pci_dev *pdev);
  68
  69 /* Access a virtual configuration space for a PCI device */
  70 int xen_pcibk_config_init(void);
  71 int xen_pcibk_config_init_dev(struct pci_dev *dev);
  72 void xen_pcibk_config_free_dyn_fields(struct pci_dev *dev);
  73 void xen_pcibk_config_reset_dev(struct pci_dev *dev);
  74 void xen_pcibk_config_free_dev(struct pci_dev *dev);
  75 int xen_pcibk_config_read(struct pci_dev *dev, int offset, int size,
  76                           u32 *ret_val);
  77 int xen_pcibk_config_write(struct pci_dev *dev, int offset, int size,
  78                            u32 value);
  79
  80 /* Handle requests for specific devices from the frontend */
  81 typedef int (*publish_pci_dev_cb) (struct xen_pcibk_device *pdev,
  82                                    unsigned int domain, unsigned int bus,
  83                                    unsigned int devfn, unsigned int devid);
  84 typedef int (*publish_pci_root_cb) (struct xen_pcibk_device *pdev,
  85                                     unsigned int domain, unsigned int bus);
  86
  87 /* Backend registration for the two types of BDF representation:
  88  *  vpci - BDFs start at 00
  89  *  passthrough - BDFs are exactly like in the host.
  90  */
  91 struct xen_pcibk_backend {
  92         char *name;
  93         int (*init)(struct xen_pcibk_device *pdev);
  94         void (*free)(struct xen_pcibk_device *pdev);
  95         int (*find)(struct pci_dev *pcidev, struct xen_pcibk_device *pdev,
  96                     unsigned int *domain, unsigned int *bus,
  97                     unsigned int *devfn);
  98         int (*publish)(struct xen_pcibk_device *pdev, publish_pci_root_cb cb);
  99         void (*release)(struct xen_pcibk_device *pdev, struct pci_dev *dev);
 100         int (*add)(struct xen_pcibk_device *pdev, struct pci_dev *dev,
 101                    int devid, publish_pci_dev_cb publish_cb);
 102         struct pci_dev *(*get)(struct xen_pcibk_device *pdev,
 103                                unsigned int domain, unsigned int bus,
 104                                unsigned int devfn);
 105 };
 106
 107 extern struct xen_pcibk_backend xen_pcibk_vpci_backend;
 108 extern struct xen_pcibk_backend xen_pcibk_passthrough_backend;
 109 extern struct xen_pcibk_backend *xen_pcibk_backend;
 110
 111 static inline int xen_pcibk_add_pci_dev(struct xen_pcibk_device *pdev,
 112                                         struct pci_dev *dev,
 113                                         int devid,
 114                                         publish_pci_dev_cb publish_cb)
 115 {
 116         if (xen_pcibk_backend && xen_pcibk_backend->add)
 117                 return xen_pcibk_backend->add(pdev, dev, devid, publish_cb);
 118         return -1;
 119 };
 120 static inline void xen_pcibk_release_pci_dev(struct xen_pcibk_device *pdev,
 121                                              struct pci_dev *dev)
 122 {
 123         if (xen_pcibk_backend && xen_pcibk_backend->free)
 124                 return xen_pcibk_backend->release(pdev, dev);
 125 };
 126
 127 static inline struct pci_dev *
 128 xen_pcibk_get_pci_dev(struct xen_pcibk_device *pdev, unsigned int domain,
 129                       unsigned int bus, unsigned int devfn)
 130 {
 131         if (xen_pcibk_backend && xen_pcibk_backend->get)
 132                 return xen_pcibk_backend->get(pdev, domain, bus, devfn);
 133         return NULL;
 134 };
 135 /**
 136 * Add for domain0 PCIE-AER handling. Get guest domain/bus/devfn in xen_pcibk
 137 * before sending aer request to pcifront, so that guest could identify
 138 * device, coopearte with xen_pcibk to finish aer recovery job if device driver
 139 * has the capability
 140 */
 141 static inline int xen_pcibk_get_pcifront_dev(struct pci_dev *pcidev,
 142                                              struct xen_pcibk_device *pdev,
 143                                              unsigned int *domain,
 144                                              unsigned int *bus,
 145                                              unsigned int *devfn)
 146 {
 147         if (xen_pcibk_backend && xen_pcibk_backend->find)
 148                 return xen_pcibk_backend->find(pcidev, pdev, domain, bus,
 149                                                devfn);
 150         return -1;
 151 };
 152 static inline int xen_pcibk_init_devices(struct xen_pcibk_device *pdev)
 153 {
 154         if (xen_pcibk_backend && xen_pcibk_backend->init)
 155                 return xen_pcibk_backend->init(pdev);
 156         return -1;
 157 };
 158 static inline int xen_pcibk_publish_pci_roots(struct xen_pcibk_device *pdev,
 159                                               publish_pci_root_cb cb)
 160 {
 161         if (xen_pcibk_backend && xen_pcibk_backend->publish)
 162                 return xen_pcibk_backend->publish(pdev, cb);
 163         return -1;
 164 };
 165 static inline void xen_pcibk_release_devices(struct xen_pcibk_device *pdev)
 166 {
 167         if (xen_pcibk_backend && xen_pcibk_backend->free)
 168                 return xen_pcibk_backend->free(pdev);
 169 };
 170 /* Handles events from front-end */
 171 irqreturn_t xen_pcibk_handle_event(int irq, void *dev_id);
 172 void xen_pcibk_do_op(struct work_struct *data);
 173
 174 int xen_pcibk_xenbus_register(void);
 175 void xen_pcibk_xenbus_unregister(void);
 176
 177 extern int verbose_request;
 178
 179 void xen_pcibk_test_and_schedule_op(struct xen_pcibk_device *pdev);
 180 #endif
 181
 182 /* Handles shared IRQs that can to device domain and control domain. */
 183 void xen_pcibk_irq_handler(struct pci_dev *dev, int reset);