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 #define DRV_NAME        "xen-pciback"
  19
  20 struct pci_dev_entry {
  21         struct list_head list;
  22         struct pci_dev *dev;
  23 };
  24
  25 #define _PDEVF_op_active        (0)
  26 #define PDEVF_op_active         (1<<(_PDEVF_op_active))
  27 #define _PCIB_op_pending        (1)
  28 #define PCIB_op_pending         (1<<(_PCIB_op_pending))
  29
  30 struct xen_pcibk_device {
  31         void *pci_dev_data;
  32         struct mutex dev_lock;
  33         struct xenbus_device *xdev;
  34         struct xenbus_watch be_watch;
  35         u8 be_watching;
  36         int evtchn_irq;
  37         struct xen_pci_sharedinfo *sh_info;
  38         unsigned long flags;
  39         struct work_struct op_work;
  40 };
  41
  42 struct xen_pcibk_dev_data {
  43         struct list_head config_fields;
  44         unsigned int permissive:1;
  45         unsigned int warned_on_write:1;
  46         unsigned int enable_intx:1;
  47         unsigned int isr_on:1; /* Whether the IRQ handler is installed. */
  48         unsigned int ack_intr:1; /* .. and ACK-ing */
  49         unsigned long handled;
  50         unsigned int irq; /* Saved in case device transitions to MSI/MSI-X */
  51         char irq_name[0]; /* xen-pcibk[000:04:00.0] */
  52 };
  53
  54 /* Used by XenBus and xen_pcibk_ops.c */
  55 extern wait_queue_head_t xen_pcibk_aer_wait_queue;
  56 extern struct workqueue_struct *xen_pcibk_wq;
  57 /* Used by pcistub.c and conf_space_quirks.c */
  58 extern struct list_head xen_pcibk_quirks;
  59
  60 /* Get/Put PCI Devices that are hidden from the PCI Backend Domain */
  61 struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev,
  62                                             int domain, int bus,
  63                                             int slot, int func);
  64 struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev,
  65                                     struct pci_dev *dev);
  66 void pcistub_put_pci_dev(struct pci_dev *dev);
  67
  68 /* Ensure a device is turned off or reset */
  69 void xen_pcibk_reset_device(struct pci_dev *pdev);
  70
  71 /* Access a virtual configuration space for a PCI device */
  72 int xen_pcibk_config_init(void);
  73 int xen_pcibk_config_init_dev(struct pci_dev *dev);
  74 void xen_pcibk_config_free_dyn_fields(struct pci_dev *dev);
  75 void xen_pcibk_config_reset_dev(struct pci_dev *dev);
  76 void xen_pcibk_config_free_dev(struct pci_dev *dev);
  77 int xen_pcibk_config_read(struct pci_dev *dev, int offset, int size,
  78                           u32 *ret_val);
  79 int xen_pcibk_config_write(struct pci_dev *dev, int offset, int size,
  80                            u32 value);
  81
  82 /* Handle requests for specific devices from the frontend */
  83 typedef int (*publish_pci_dev_cb) (struct xen_pcibk_device *pdev,
  84                                    unsigned int domain, unsigned int bus,
  85                                    unsigned int devfn, unsigned int devid);
  86 typedef int (*publish_pci_root_cb) (struct xen_pcibk_device *pdev,
  87                                     unsigned int domain, unsigned int bus);
  88
  89 /* Backend registration for the two types of BDF representation:
  90  *  vpci - BDFs start at 00
  91  *  passthrough - BDFs are exactly like in the host.
  92  */
  93 struct xen_pcibk_backend {
  94         const char *name;
  95         int (*init)(struct xen_pcibk_device *pdev);
  96         void (*free)(struct xen_pcibk_device *pdev);
  97         int (*find)(struct pci_dev *pcidev, struct xen_pcibk_device *pdev,
  98                     unsigned int *domain, unsigned int *bus,
  99                     unsigned int *devfn);
 100         int (*publish)(struct xen_pcibk_device *pdev, publish_pci_root_cb cb);
 101         void (*release)(struct xen_pcibk_device *pdev, struct pci_dev *dev);
 102         int (*add)(struct xen_pcibk_device *pdev, struct pci_dev *dev,
 103                    int devid, publish_pci_dev_cb publish_cb);
 104         struct pci_dev *(*get)(struct xen_pcibk_device *pdev,
 105                                unsigned int domain, unsigned int bus,
 106                                unsigned int devfn);
 107 };
 108
 109 extern const struct xen_pcibk_backend xen_pcibk_vpci_backend;
 110 extern const struct xen_pcibk_backend xen_pcibk_passthrough_backend;
 111 extern const struct xen_pcibk_backend *xen_pcibk_backend;
 112
 113 static inline int xen_pcibk_add_pci_dev(struct xen_pcibk_device *pdev,
 114                                         struct pci_dev *dev,
 115                                         int devid,
 116                                         publish_pci_dev_cb publish_cb)
 117 {
 118         if (xen_pcibk_backend && xen_pcibk_backend->add)
 119                 return xen_pcibk_backend->add(pdev, dev, devid, publish_cb);
 120         return -1;
 121 }
 122
 123 static inline void xen_pcibk_release_pci_dev(struct xen_pcibk_device *pdev,
 124                                              struct pci_dev *dev)
 125 {
 126         if (xen_pcibk_backend && xen_pcibk_backend->free)
 127                 return xen_pcibk_backend->release(pdev, dev);
 128 }
 129
 130 static inline struct pci_dev *
 131 xen_pcibk_get_pci_dev(struct xen_pcibk_device *pdev, unsigned int domain,
 132                       unsigned int bus, unsigned int devfn)
 133 {
 134         if (xen_pcibk_backend && xen_pcibk_backend->get)
 135                 return xen_pcibk_backend->get(pdev, domain, bus, devfn);
 136         return NULL;
 137 }
 138
 139 /**
 140 * Add for domain0 PCIE-AER handling. Get guest domain/bus/devfn in xen_pcibk
 141 * before sending aer request to pcifront, so that guest could identify
 142 * device, coopearte with xen_pcibk to finish aer recovery job if device driver
 143 * has the capability
 144 */
 145 static inline int xen_pcibk_get_pcifront_dev(struct pci_dev *pcidev,
 146                                              struct xen_pcibk_device *pdev,
 147                                              unsigned int *domain,
 148                                              unsigned int *bus,
 149                                              unsigned int *devfn)
 150 {
 151         if (xen_pcibk_backend && xen_pcibk_backend->find)
 152                 return xen_pcibk_backend->find(pcidev, pdev, domain, bus,
 153                                                devfn);
 154         return -1;
 155 }
 156
 157 static inline int xen_pcibk_init_devices(struct xen_pcibk_device *pdev)
 158 {
 159         if (xen_pcibk_backend && xen_pcibk_backend->init)
 160                 return xen_pcibk_backend->init(pdev);
 161         return -1;
 162 }
 163
 164 static inline int xen_pcibk_publish_pci_roots(struct xen_pcibk_device *pdev,
 165                                               publish_pci_root_cb cb)
 166 {
 167         if (xen_pcibk_backend && xen_pcibk_backend->publish)
 168                 return xen_pcibk_backend->publish(pdev, cb);
 169         return -1;
 170 }
 171
 172 static inline void xen_pcibk_release_devices(struct xen_pcibk_device *pdev)
 173 {
 174         if (xen_pcibk_backend && xen_pcibk_backend->free)
 175                 return xen_pcibk_backend->free(pdev);
 176 }
 177
 178 /* Handles events from front-end */
 179 irqreturn_t xen_pcibk_handle_event(int irq, void *dev_id);
 180 void xen_pcibk_do_op(struct work_struct *data);
 181
 182 int xen_pcibk_xenbus_register(void);
 183 void xen_pcibk_xenbus_unregister(void);
 184
 185 extern int verbose_request;
 186
 187 void xen_pcibk_test_and_schedule_op(struct xen_pcibk_device *pdev);
 188 #endif
 189
 190 /* Handles shared IRQs that can to device domain and control domain. */
 191 void xen_pcibk_irq_handler(struct pci_dev *dev, int reset);