include/hw/xen/xen-bus.h

   1 /*
   2  * Copyright (c) 2018  Citrix Systems Inc.
   3  *
   4  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   5  * See the COPYING file in the top-level directory.
   6  */
   7
   8 #ifndef HW_XEN_BUS_H
   9 #define HW_XEN_BUS_H
  10
  11 #include "hw/xen/xen_backend_ops.h"
  12 #include "hw/sysbus.h"
  13 #include "qemu/notify.h"
  14 #include "qom/object.h"
  15
  16 typedef struct XenEventChannel XenEventChannel;
  17
  18 struct XenDevice {
  19     DeviceState qdev;
  20     domid_t frontend_id;
  21     char *name;
  22     struct qemu_xs_handle *xsh;
  23     char *backend_path, *frontend_path;
  24     enum xenbus_state backend_state, frontend_state;
  25     Notifier exit;
  26     struct qemu_xs_watch *backend_state_watch, *frontend_state_watch;
  27     bool backend_online;
  28     struct qemu_xs_watch *backend_online_watch;
  29     xengnttab_handle *xgth;
  30     bool inactive;
  31     QLIST_HEAD(, XenEventChannel) event_channels;
  32     QLIST_ENTRY(XenDevice) list;
  33 };
  34 typedef struct XenDevice XenDevice;
  35
  36 typedef char *(*XenDeviceGetName)(XenDevice *xendev, Error **errp);
  37 typedef void (*XenDeviceRealize)(XenDevice *xendev, Error **errp);
  38 typedef void (*XenDeviceFrontendChanged)(XenDevice *xendev,
  39                                          enum xenbus_state frontend_state,
  40                                          Error **errp);
  41 typedef void (*XenDeviceUnrealize)(XenDevice *xendev);
  42
  43 struct XenDeviceClass {
  44     /*< private >*/
  45     DeviceClass parent_class;
  46     /*< public >*/
  47     const char *backend;
  48     const char *device;
  49     XenDeviceGetName get_name;
  50     XenDeviceRealize realize;
  51     XenDeviceFrontendChanged frontend_changed;
  52     XenDeviceUnrealize unrealize;
  53 };
  54
  55 #define TYPE_XEN_DEVICE "xen-device"
  56 OBJECT_DECLARE_TYPE(XenDevice, XenDeviceClass, XEN_DEVICE)
  57
  58 struct XenBus {
  59     BusState qbus;
  60     domid_t backend_id;
  61     struct qemu_xs_handle *xsh;
  62     unsigned int backend_types;
  63     struct qemu_xs_watch **backend_watch;
  64     QLIST_HEAD(, XenDevice) inactive_devices;
  65 };
  66
  67 struct XenBusClass {
  68     /*< private >*/
  69     BusClass parent_class;
  70 };
  71
  72 #define TYPE_XEN_BUS "xen-bus"
  73 OBJECT_DECLARE_TYPE(XenBus, XenBusClass,
  74                     XEN_BUS)
  75
  76 void xen_bus_init(void);
  77
  78 void xen_device_backend_set_state(XenDevice *xendev,
  79                                   enum xenbus_state state);
  80 enum xenbus_state xen_device_backend_get_state(XenDevice *xendev);
  81
  82 void xen_device_backend_printf(XenDevice *xendev, const char *key,
  83                                const char *fmt, ...)
  84     G_GNUC_PRINTF(3, 4);
  85 void xen_device_frontend_printf(XenDevice *xendev, const char *key,
  86                                 const char *fmt, ...)
  87     G_GNUC_PRINTF(3, 4);
  88
  89 int xen_device_frontend_scanf(XenDevice *xendev, const char *key,
  90                               const char *fmt, ...)
  91     G_GNUC_SCANF(3, 4);
  92
  93 void xen_device_set_max_grant_refs(XenDevice *xendev, unsigned int nr_refs,
  94                                    Error **errp);
  95 void *xen_device_map_grant_refs(XenDevice *xendev, uint32_t *refs,
  96                                 unsigned int nr_refs, int prot,
  97                                 Error **errp);
  98 void xen_device_unmap_grant_refs(XenDevice *xendev, void *map, uint32_t *refs,
  99                                  unsigned int nr_refs, Error **errp);
 100
 101 typedef struct XenDeviceGrantCopySegment {
 102     union {
 103         void *virt;
 104         struct {
 105             uint32_t ref;
 106             off_t offset;
 107         } foreign;
 108     } source, dest;
 109     size_t len;
 110 } XenDeviceGrantCopySegment;
 111
 112 void xen_device_copy_grant_refs(XenDevice *xendev, bool to_domain,
 113                                 XenDeviceGrantCopySegment segs[],
 114                                 unsigned int nr_segs, Error **errp);
 115
 116 typedef bool (*XenEventHandler)(void *opaque);
 117
 118 XenEventChannel *xen_device_bind_event_channel(XenDevice *xendev,
 119                                                unsigned int port,
 120                                                XenEventHandler handler,
 121                                                void *opaque, Error **errp);
 122 void xen_device_set_event_channel_context(XenDevice *xendev,
 123                                           XenEventChannel *channel,
 124                                           AioContext *ctx,
 125                                           Error **errp);
 126 void xen_device_notify_event_channel(XenDevice *xendev,
 127                                      XenEventChannel *channel,
 128                                      Error **errp);
 129 void xen_device_unbind_event_channel(XenDevice *xendev,
 130                                      XenEventChannel *channel,
 131                                      Error **errp);
 132
 133 #endif /* HW_XEN_BUS_H */