^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /******************************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * Talks to Xen Store to figure out what devices we have.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2005 Rusty Russell, IBM Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2005 Mike Wray, Hewlett-Packard
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2005, 2006 XenSource Ltd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * This program is free software; you can redistribute it and/or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * modify it under the terms of the GNU General Public License version 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * as published by the Free Software Foundation; or, when distributed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * separately from the Linux kernel or incorporated into other
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * software packages, subject to the following license:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Permission is hereby granted, free of charge, to any person obtaining a copy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * of this source file (the "Software"), to deal in the Software without
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * restriction, including without limitation the rights to use, copy, modify,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * merge, publish, distribute, sublicense, and/or sell copies of the Software,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * and to permit persons to whom the Software is furnished to do so, subject to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * the following conditions:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * The above copyright notice and this permission notice shall be included in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * all copies or substantial portions of the Software.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * IN THE SOFTWARE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define dev_fmt pr_fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define DPRINTK(fmt, args...) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) pr_debug("xenbus_probe (%s:%d) " fmt ".\n", \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) __func__, __LINE__, ##args)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #include <linux/ctype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #include <linux/fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #include <linux/proc_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #include <linux/notifier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #include <linux/kthread.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #include <asm/xen/hypervisor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #include <xen/xen.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) #include <xen/xenbus.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) #include <xen/events.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) #include <xen/xen-ops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) #include <xen/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) #include <xen/hvm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) #include "xenbus.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) int xen_store_evtchn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) EXPORT_SYMBOL_GPL(xen_store_evtchn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) struct xenstore_domain_interface *xen_store_interface;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) EXPORT_SYMBOL_GPL(xen_store_interface);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) enum xenstore_init xen_store_domain_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) EXPORT_SYMBOL_GPL(xen_store_domain_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) static unsigned long xen_store_gfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) static BLOCKING_NOTIFIER_HEAD(xenstore_chain);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) /* If something in array of ids matches this device, return it. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) static const struct xenbus_device_id *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) match_device(const struct xenbus_device_id *arr, struct xenbus_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) for (; *arr->devicetype != '\0'; arr++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (!strcmp(arr->devicetype, dev->devicetype))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) return arr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) int xenbus_match(struct device *_dev, struct device_driver *_drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) struct xenbus_driver *drv = to_xenbus_driver(_drv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (!drv->ids)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) return match_device(drv->ids, to_xenbus_device(_dev)) != NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) EXPORT_SYMBOL_GPL(xenbus_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static void free_otherend_details(struct xenbus_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) kfree(dev->otherend);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) dev->otherend = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static void free_otherend_watch(struct xenbus_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) if (dev->otherend_watch.node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) unregister_xenbus_watch(&dev->otherend_watch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) kfree(dev->otherend_watch.node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) dev->otherend_watch.node = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) static int talk_to_otherend(struct xenbus_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) struct xenbus_driver *drv = to_xenbus_driver(dev->dev.driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) free_otherend_watch(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) free_otherend_details(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return drv->read_otherend_details(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) static int watch_otherend(struct xenbus_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) struct xen_bus_type *bus =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) container_of(dev->dev.bus, struct xen_bus_type, bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return xenbus_watch_pathfmt(dev, &dev->otherend_watch,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) bus->otherend_will_handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) bus->otherend_changed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) "%s/%s", dev->otherend, "state");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) int xenbus_read_otherend_details(struct xenbus_device *xendev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) char *id_node, char *path_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) int err = xenbus_gather(XBT_NIL, xendev->nodename,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) id_node, "%i", &xendev->otherend_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) path_node, NULL, &xendev->otherend,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) xenbus_dev_fatal(xendev, err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) "reading other end details from %s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) xendev->nodename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) if (strlen(xendev->otherend) == 0 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) !xenbus_exists(XBT_NIL, xendev->otherend, "")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) xenbus_dev_fatal(xendev, -ENOENT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) "unable to read other end from %s. "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) "missing or inaccessible.",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) xendev->nodename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) free_otherend_details(xendev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) EXPORT_SYMBOL_GPL(xenbus_read_otherend_details);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) void xenbus_otherend_changed(struct xenbus_watch *watch,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) const char *path, const char *token,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) int ignore_on_shutdown)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) struct xenbus_device *dev =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) container_of(watch, struct xenbus_device, otherend_watch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) struct xenbus_driver *drv = to_xenbus_driver(dev->dev.driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) enum xenbus_state state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) /* Protect us against watches firing on old details when the otherend
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) details change, say immediately after a resume. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) if (!dev->otherend ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) strncmp(dev->otherend, path, strlen(dev->otherend))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) dev_dbg(&dev->dev, "Ignoring watch at %s\n", path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) state = xenbus_read_driver_state(dev->otherend);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) dev_dbg(&dev->dev, "state is %d, (%s), %s, %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) state, xenbus_strstate(state), dev->otherend_watch.node, path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) * Ignore xenbus transitions during shutdown. This prevents us doing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) * work that can fail e.g., when the rootfs is gone.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if (system_state > SYSTEM_RUNNING) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) if (ignore_on_shutdown && (state == XenbusStateClosing))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) xenbus_frontend_closed(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) if (drv->otherend_changed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) drv->otherend_changed(dev, state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) EXPORT_SYMBOL_GPL(xenbus_otherend_changed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) int xenbus_dev_probe(struct device *_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) struct xenbus_device *dev = to_xenbus_device(_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) struct xenbus_driver *drv = to_xenbus_driver(_dev->driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) const struct xenbus_device_id *id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) DPRINTK("%s", dev->nodename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) if (!drv->probe) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) id = match_device(drv->ids, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) if (!id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) err = talk_to_otherend(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) dev_warn(&dev->dev, "talk_to_otherend on %s failed.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) dev->nodename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) if (!try_module_get(drv->driver.owner)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) dev_warn(&dev->dev, "failed to acquire module reference on '%s'\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) drv->driver.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) err = -ESRCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) down(&dev->reclaim_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) err = drv->probe(dev, id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) up(&dev->reclaim_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) goto fail_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) err = watch_otherend(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) dev_warn(&dev->dev, "watch_otherend on %s failed.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) dev->nodename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) fail_put:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) module_put(drv->driver.owner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) xenbus_dev_error(dev, err, "xenbus_dev_probe on %s", dev->nodename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) EXPORT_SYMBOL_GPL(xenbus_dev_probe);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) int xenbus_dev_remove(struct device *_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) struct xenbus_device *dev = to_xenbus_device(_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) struct xenbus_driver *drv = to_xenbus_driver(_dev->driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) DPRINTK("%s", dev->nodename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) free_otherend_watch(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) if (drv->remove) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) down(&dev->reclaim_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) drv->remove(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) up(&dev->reclaim_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) module_put(drv->driver.owner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) free_otherend_details(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) * If the toolstack has forced the device state to closing then set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) * the state to closed now to allow it to be cleaned up.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) * Similarly, if the driver does not support re-bind, set the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) * closed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) if (!drv->allow_rebind ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) xenbus_read_driver_state(dev->nodename) == XenbusStateClosing)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) xenbus_switch_state(dev, XenbusStateClosed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) EXPORT_SYMBOL_GPL(xenbus_dev_remove);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) int xenbus_register_driver_common(struct xenbus_driver *drv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) struct xen_bus_type *bus,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) struct module *owner, const char *mod_name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) drv->driver.name = drv->name ? drv->name : drv->ids[0].devicetype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) drv->driver.bus = &bus->bus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) drv->driver.owner = owner;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) drv->driver.mod_name = mod_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) return driver_register(&drv->driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) EXPORT_SYMBOL_GPL(xenbus_register_driver_common);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) void xenbus_unregister_driver(struct xenbus_driver *drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) driver_unregister(&drv->driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) EXPORT_SYMBOL_GPL(xenbus_unregister_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) struct xb_find_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) struct xenbus_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) const char *nodename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) static int cmp_dev(struct device *dev, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) struct xenbus_device *xendev = to_xenbus_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) struct xb_find_info *info = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) if (!strcmp(xendev->nodename, info->nodename)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) info->dev = xendev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) get_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) static struct xenbus_device *xenbus_device_find(const char *nodename,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) struct bus_type *bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) struct xb_find_info info = { .dev = NULL, .nodename = nodename };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) bus_for_each_dev(bus, NULL, &info, cmp_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) return info.dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) static int cleanup_dev(struct device *dev, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) struct xenbus_device *xendev = to_xenbus_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) struct xb_find_info *info = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) int len = strlen(info->nodename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) DPRINTK("%s", info->nodename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) /* Match the info->nodename path, or any subdirectory of that path. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) if (strncmp(xendev->nodename, info->nodename, len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) /* If the node name is longer, ensure it really is a subdirectory. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) if ((strlen(xendev->nodename) > len) && (xendev->nodename[len] != '/'))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) info->dev = xendev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) get_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) static void xenbus_cleanup_devices(const char *path, struct bus_type *bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) struct xb_find_info info = { .nodename = path };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) info.dev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) bus_for_each_dev(bus, NULL, &info, cleanup_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) if (info.dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) device_unregister(&info.dev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) put_device(&info.dev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) } while (info.dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) static void xenbus_dev_release(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) if (dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) kfree(to_xenbus_device(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) static ssize_t nodename_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) return sprintf(buf, "%s\n", to_xenbus_device(dev)->nodename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) static DEVICE_ATTR_RO(nodename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) static ssize_t devtype_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) return sprintf(buf, "%s\n", to_xenbus_device(dev)->devicetype);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) static DEVICE_ATTR_RO(devtype);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) static ssize_t modalias_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) return sprintf(buf, "%s:%s\n", dev->bus->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) to_xenbus_device(dev)->devicetype);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) static DEVICE_ATTR_RO(modalias);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) static ssize_t state_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) return sprintf(buf, "%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) xenbus_strstate(to_xenbus_device(dev)->state));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) static DEVICE_ATTR_RO(state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) static struct attribute *xenbus_dev_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) &dev_attr_nodename.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) &dev_attr_devtype.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) &dev_attr_modalias.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) &dev_attr_state.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) static const struct attribute_group xenbus_dev_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) .attrs = xenbus_dev_attrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) const struct attribute_group *xenbus_dev_groups[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) &xenbus_dev_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) EXPORT_SYMBOL_GPL(xenbus_dev_groups);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) int xenbus_probe_node(struct xen_bus_type *bus,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) const char *type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) const char *nodename)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) char devname[XEN_BUS_ID_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) struct xenbus_device *xendev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) size_t stringlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) char *tmpstring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) enum xenbus_state state = xenbus_read_driver_state(nodename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) if (state != XenbusStateInitialising) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) /* Device is not new, so ignore it. This can happen if a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) device is going away after switching to Closed. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) stringlen = strlen(nodename) + 1 + strlen(type) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) xendev = kzalloc(sizeof(*xendev) + stringlen, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) if (!xendev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) xendev->state = XenbusStateInitialising;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) /* Copy the strings into the extra space. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) tmpstring = (char *)(xendev + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) strcpy(tmpstring, nodename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) xendev->nodename = tmpstring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) tmpstring += strlen(tmpstring) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) strcpy(tmpstring, type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) xendev->devicetype = tmpstring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) init_completion(&xendev->down);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) xendev->dev.bus = &bus->bus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) xendev->dev.release = xenbus_dev_release;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) err = bus->get_bus_id(devname, xendev->nodename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) dev_set_name(&xendev->dev, "%s", devname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) sema_init(&xendev->reclaim_sem, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) /* Register with generic device framework. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) err = device_register(&xendev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) put_device(&xendev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) xendev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) kfree(xendev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) EXPORT_SYMBOL_GPL(xenbus_probe_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) static int xenbus_probe_device_type(struct xen_bus_type *bus, const char *type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) char **dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) unsigned int dir_n = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) dir = xenbus_directory(XBT_NIL, bus->root, type, &dir_n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) if (IS_ERR(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) return PTR_ERR(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) for (i = 0; i < dir_n; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) err = bus->probe(bus, type, dir[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) kfree(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) int xenbus_probe_devices(struct xen_bus_type *bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) char **dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) unsigned int i, dir_n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) dir = xenbus_directory(XBT_NIL, bus->root, "", &dir_n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) if (IS_ERR(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) return PTR_ERR(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) for (i = 0; i < dir_n; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) err = xenbus_probe_device_type(bus, dir[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) kfree(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) EXPORT_SYMBOL_GPL(xenbus_probe_devices);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) static unsigned int char_count(const char *str, char c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) unsigned int i, ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) for (i = 0; str[i]; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) if (str[i] == c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) ret++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) static int strsep_len(const char *str, char c, unsigned int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) for (i = 0; str[i]; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) if (str[i] == c) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) if (len == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) return i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) len--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) return (len == 0) ? i : -ERANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) void xenbus_dev_changed(const char *node, struct xen_bus_type *bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) int exists, rootlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) struct xenbus_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) char type[XEN_BUS_ID_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) const char *p, *root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) if (char_count(node, '/') < 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) exists = xenbus_exists(XBT_NIL, node, "");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) if (!exists) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) xenbus_cleanup_devices(node, &bus->bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) /* backend/<type>/... or device/<type>/... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) p = strchr(node, '/') + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) snprintf(type, XEN_BUS_ID_SIZE, "%.*s", (int)strcspn(p, "/"), p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) type[XEN_BUS_ID_SIZE-1] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) rootlen = strsep_len(node, '/', bus->levels);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) if (rootlen < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) root = kasprintf(GFP_KERNEL, "%.*s", rootlen, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) if (!root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) dev = xenbus_device_find(root, &bus->bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) if (!dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) xenbus_probe_node(bus, type, root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) put_device(&dev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) kfree(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) EXPORT_SYMBOL_GPL(xenbus_dev_changed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) int xenbus_dev_suspend(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) struct xenbus_driver *drv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) struct xenbus_device *xdev
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) = container_of(dev, struct xenbus_device, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) DPRINTK("%s", xdev->nodename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) if (dev->driver == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) drv = to_xenbus_driver(dev->driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) if (drv->suspend)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) err = drv->suspend(xdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) dev_warn(dev, "suspend failed: %i\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) EXPORT_SYMBOL_GPL(xenbus_dev_suspend);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) int xenbus_dev_resume(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) struct xenbus_driver *drv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) struct xenbus_device *xdev
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) = container_of(dev, struct xenbus_device, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) DPRINTK("%s", xdev->nodename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) if (dev->driver == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) drv = to_xenbus_driver(dev->driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) err = talk_to_otherend(xdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) dev_warn(dev, "resume (talk_to_otherend) failed: %i\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) xdev->state = XenbusStateInitialising;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) if (drv->resume) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) err = drv->resume(xdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) dev_warn(dev, "resume failed: %i\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) err = watch_otherend(xdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) dev_warn(dev, "resume (watch_otherend) failed: %d\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) EXPORT_SYMBOL_GPL(xenbus_dev_resume);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) int xenbus_dev_cancel(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) /* Do nothing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) DPRINTK("cancel");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) EXPORT_SYMBOL_GPL(xenbus_dev_cancel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) /* A flag to determine if xenstored is 'ready' (i.e. has started) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) int xenstored_ready;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) int register_xenstore_notifier(struct notifier_block *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) if (xenstored_ready > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) ret = nb->notifier_call(nb, 0, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) blocking_notifier_chain_register(&xenstore_chain, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) EXPORT_SYMBOL_GPL(register_xenstore_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) void unregister_xenstore_notifier(struct notifier_block *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) blocking_notifier_chain_unregister(&xenstore_chain, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) EXPORT_SYMBOL_GPL(unregister_xenstore_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) static void xenbus_probe(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) xenstored_ready = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) * In the HVM case, xenbus_init() deferred its call to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) * xs_init() in case callbacks were not operational yet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) * So do it now.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) if (xen_store_domain_type == XS_HVM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) xs_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) /* Notify others that xenstore is up */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) blocking_notifier_call_chain(&xenstore_chain, 0, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) * Returns true when XenStore init must be deferred in order to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) * allow the PCI platform device to be initialised, before we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) * can actually have event channel interrupts working.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) static bool xs_hvm_defer_init_for_callback(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) #ifdef CONFIG_XEN_PVHVM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) return xen_store_domain_type == XS_HVM &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) !xen_have_vector_callback;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) static int xenbus_probe_thread(void *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) DEFINE_WAIT(w);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) * We actually just want to wait for *any* trigger of xb_waitq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) * and run xenbus_probe() the moment it occurs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) prepare_to_wait(&xb_waitq, &w, TASK_INTERRUPTIBLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) schedule();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) finish_wait(&xb_waitq, &w);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) DPRINTK("probing");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) xenbus_probe();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) static int __init xenbus_probe_initcall(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) * Probe XenBus here in the XS_PV case, and also XS_HVM unless we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) * need to wait for the platform PCI device to come up.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) if (xen_store_domain_type == XS_PV ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) (xen_store_domain_type == XS_HVM &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) !xs_hvm_defer_init_for_callback()))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) xenbus_probe();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) * For XS_LOCAL, spawn a thread which will wait for xenstored
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) * or a xenstore-stubdom to be started, then probe. It will be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) * triggered when communication starts happening, by waiting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) * on xb_waitq.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) if (xen_store_domain_type == XS_LOCAL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) struct task_struct *probe_task;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) probe_task = kthread_run(xenbus_probe_thread, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) "xenbus_probe");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) if (IS_ERR(probe_task))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) return PTR_ERR(probe_task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) device_initcall(xenbus_probe_initcall);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) int xen_set_callback_via(uint64_t via)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) struct xen_hvm_param a;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) a.domid = DOMID_SELF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) a.index = HVM_PARAM_CALLBACK_IRQ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) a.value = via;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) ret = HYPERVISOR_hvm_op(HVMOP_set_param, &a);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) * If xenbus_probe_initcall() deferred the xenbus_probe()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) * due to the callback not functioning yet, we can do it now.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) if (!xenstored_ready && xs_hvm_defer_init_for_callback())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) xenbus_probe();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) EXPORT_SYMBOL_GPL(xen_set_callback_via);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) /* Set up event channel for xenstored which is run as a local process
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) * (this is normally used only in dom0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) static int __init xenstored_local_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) int err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) unsigned long page = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) struct evtchn_alloc_unbound alloc_unbound;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) /* Allocate Xenstore page */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) page = get_zeroed_page(GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) xen_store_gfn = virt_to_gfn((void *)page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) /* Next allocate a local port which xenstored can bind to */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) alloc_unbound.dom = DOMID_SELF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) alloc_unbound.remote_dom = DOMID_SELF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) err = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) &alloc_unbound);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) if (err == -ENOSYS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) BUG_ON(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) xen_store_evtchn = alloc_unbound.port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) out_err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) if (page != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) free_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) static int xenbus_resume_cb(struct notifier_block *nb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) unsigned long action, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) if (xen_hvm_domain()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) uint64_t v = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) if (!err && v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) xen_store_evtchn = v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) pr_warn("Cannot update xenstore event channel: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) xen_store_evtchn = xen_start_info->store_evtchn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) static struct notifier_block xenbus_resume_nb = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) .notifier_call = xenbus_resume_cb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) static int __init xenbus_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) uint64_t v = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) xen_store_domain_type = XS_UNKNOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) if (!xen_domain())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) xenbus_ring_ops_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) if (xen_pv_domain())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) xen_store_domain_type = XS_PV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) if (xen_hvm_domain())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) xen_store_domain_type = XS_HVM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) if (xen_hvm_domain() && xen_initial_domain())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) xen_store_domain_type = XS_LOCAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) if (xen_pv_domain() && !xen_start_info->store_evtchn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) xen_store_domain_type = XS_LOCAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) if (xen_pv_domain() && xen_start_info->store_evtchn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) xenstored_ready = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) switch (xen_store_domain_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) case XS_LOCAL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) err = xenstored_local_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) goto out_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) xen_store_interface = gfn_to_virt(xen_store_gfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) case XS_PV:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) xen_store_evtchn = xen_start_info->store_evtchn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) xen_store_gfn = xen_start_info->store_mfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) xen_store_interface = gfn_to_virt(xen_store_gfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) case XS_HVM:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) goto out_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) xen_store_evtchn = (int)v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) err = hvm_get_parameter(HVM_PARAM_STORE_PFN, &v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) goto out_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) * Uninitialized hvm_params are zero and return no error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) * Although it is theoretically possible to have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) * HVM_PARAM_STORE_PFN set to zero on purpose, in reality it is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) * not zero when valid. If zero, it means that Xenstore hasn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) * been properly initialized. Instead of attempting to map a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) * wrong guest physical address return error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) * Also recognize all bits set as an invalid value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) if (!v || !~v) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) err = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) goto out_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) /* Avoid truncation on 32-bit. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) #if BITS_PER_LONG == 32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) if (v > ULONG_MAX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) pr_err("%s: cannot handle HVM_PARAM_STORE_PFN=%llx > ULONG_MAX\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) __func__, v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) goto out_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) xen_store_gfn = (unsigned long)v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) xen_store_interface =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) xen_remap(xen_store_gfn << XEN_PAGE_SHIFT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) XEN_PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) pr_warn("Xenstore state unknown\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) * HVM domains may not have a functional callback yet. In that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) * case let xs_init() be called from xenbus_probe(), which will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) * get invoked at an appropriate time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) if (xen_store_domain_type != XS_HVM) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) err = xs_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) pr_warn("Error initializing xenstore comms: %i\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) goto out_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) if ((xen_store_domain_type != XS_LOCAL) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) (xen_store_domain_type != XS_UNKNOWN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) xen_resume_notifier_register(&xenbus_resume_nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) #ifdef CONFIG_XEN_COMPAT_XENFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) * Create xenfs mountpoint in /proc for compatibility with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) * utilities that expect to find "xenbus" under "/proc/xen".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) proc_create_mount_point("xen");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) out_error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) xen_store_domain_type = XS_UNKNOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) postcore_initcall(xenbus_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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