mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 00:30:52 +07:00
89b0c20d80
commit c4295ab0b485b8bc50d2264bcae2acd06f25caaf upstream.
After Commit 3499ba8198cad ("xen: Fix event channel callback via
INTX/GSI"), xenbus_probe() will be called too early on Arm. This will
recent to a guest hang during boot.
If the hang wasn't there, we would have ended up to call
xenbus_probe() twice (the second time is in xenbus_probe_initcall()).
We don't need to initialize xenbus_probe() early for Arm guest.
Therefore, the call in xen_guest_init() is now removed.
After this change, there is no more external caller for xenbus_probe().
So the function is turned to a static one. Interestingly there were two
prototypes for it.
Cc: stable@vger.kernel.org
Fixes: 3499ba8198cad ("xen: Fix event channel callback via INTX/GSI")
Reported-by: Ian Jackson <iwj@xenproject.org>
Signed-off-by: Julien Grall <jgrall@amazon.com>
Reviewed-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Link: https://lore.kernel.org/r/20210210170654.5377-1-julien@xen.org
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
246 lines
8.5 KiB
C
246 lines
8.5 KiB
C
/******************************************************************************
|
|
* xenbus.h
|
|
*
|
|
* Talks to Xen Store to figure out what devices we have.
|
|
*
|
|
* Copyright (C) 2005 Rusty Russell, IBM Corporation
|
|
* Copyright (C) 2005 XenSource Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License version 2
|
|
* as published by the Free Software Foundation; or, when distributed
|
|
* separately from the Linux kernel or incorporated into other
|
|
* software packages, subject to the following license:
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this source file (the "Software"), to deal in the Software without
|
|
* restriction, including without limitation the rights to use, copy, modify,
|
|
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
|
|
* and to permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
|
* IN THE SOFTWARE.
|
|
*/
|
|
|
|
#ifndef _XEN_XENBUS_H
|
|
#define _XEN_XENBUS_H
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/export.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/semaphore.h>
|
|
#include <xen/interface/xen.h>
|
|
#include <xen/interface/grant_table.h>
|
|
#include <xen/interface/io/xenbus.h>
|
|
#include <xen/interface/io/xs_wire.h>
|
|
#include <xen/interface/event_channel.h>
|
|
|
|
#define XENBUS_MAX_RING_GRANT_ORDER 4
|
|
#define XENBUS_MAX_RING_GRANTS (1U << XENBUS_MAX_RING_GRANT_ORDER)
|
|
#define INVALID_GRANT_HANDLE (~0U)
|
|
|
|
/* Register callback to watch this node. */
|
|
struct xenbus_watch
|
|
{
|
|
struct list_head list;
|
|
|
|
/* Path being watched. */
|
|
const char *node;
|
|
|
|
unsigned int nr_pending;
|
|
|
|
/*
|
|
* Called just before enqueing new event while a spinlock is held.
|
|
* The event will be discarded if this callback returns false.
|
|
*/
|
|
bool (*will_handle)(struct xenbus_watch *,
|
|
const char *path, const char *token);
|
|
|
|
/* Callback (executed in a process context with no locks held). */
|
|
void (*callback)(struct xenbus_watch *,
|
|
const char *path, const char *token);
|
|
};
|
|
|
|
|
|
/* A xenbus device. */
|
|
struct xenbus_device {
|
|
const char *devicetype;
|
|
const char *nodename;
|
|
const char *otherend;
|
|
int otherend_id;
|
|
struct xenbus_watch otherend_watch;
|
|
struct device dev;
|
|
enum xenbus_state state;
|
|
struct completion down;
|
|
struct work_struct work;
|
|
struct semaphore reclaim_sem;
|
|
};
|
|
|
|
static inline struct xenbus_device *to_xenbus_device(struct device *dev)
|
|
{
|
|
return container_of(dev, struct xenbus_device, dev);
|
|
}
|
|
|
|
struct xenbus_device_id
|
|
{
|
|
/* .../device/<device_type>/<identifier> */
|
|
char devicetype[32]; /* General class of device. */
|
|
};
|
|
|
|
/* A xenbus driver. */
|
|
struct xenbus_driver {
|
|
const char *name; /* defaults to ids[0].devicetype */
|
|
const struct xenbus_device_id *ids;
|
|
bool allow_rebind; /* avoid setting xenstore closed during remove */
|
|
int (*probe)(struct xenbus_device *dev,
|
|
const struct xenbus_device_id *id);
|
|
void (*otherend_changed)(struct xenbus_device *dev,
|
|
enum xenbus_state backend_state);
|
|
int (*remove)(struct xenbus_device *dev);
|
|
int (*suspend)(struct xenbus_device *dev);
|
|
int (*resume)(struct xenbus_device *dev);
|
|
int (*uevent)(struct xenbus_device *, struct kobj_uevent_env *);
|
|
struct device_driver driver;
|
|
int (*read_otherend_details)(struct xenbus_device *dev);
|
|
int (*is_ready)(struct xenbus_device *dev);
|
|
void (*reclaim_memory)(struct xenbus_device *dev);
|
|
};
|
|
|
|
static inline struct xenbus_driver *to_xenbus_driver(struct device_driver *drv)
|
|
{
|
|
return container_of(drv, struct xenbus_driver, driver);
|
|
}
|
|
|
|
int __must_check __xenbus_register_frontend(struct xenbus_driver *drv,
|
|
struct module *owner,
|
|
const char *mod_name);
|
|
int __must_check __xenbus_register_backend(struct xenbus_driver *drv,
|
|
struct module *owner,
|
|
const char *mod_name);
|
|
|
|
#define xenbus_register_frontend(drv) \
|
|
__xenbus_register_frontend(drv, THIS_MODULE, KBUILD_MODNAME)
|
|
#define xenbus_register_backend(drv) \
|
|
__xenbus_register_backend(drv, THIS_MODULE, KBUILD_MODNAME)
|
|
|
|
void xenbus_unregister_driver(struct xenbus_driver *drv);
|
|
|
|
struct xenbus_transaction
|
|
{
|
|
u32 id;
|
|
};
|
|
|
|
/* Nil transaction ID. */
|
|
#define XBT_NIL ((struct xenbus_transaction) { 0 })
|
|
|
|
char **xenbus_directory(struct xenbus_transaction t,
|
|
const char *dir, const char *node, unsigned int *num);
|
|
void *xenbus_read(struct xenbus_transaction t,
|
|
const char *dir, const char *node, unsigned int *len);
|
|
int xenbus_write(struct xenbus_transaction t,
|
|
const char *dir, const char *node, const char *string);
|
|
int xenbus_mkdir(struct xenbus_transaction t,
|
|
const char *dir, const char *node);
|
|
int xenbus_exists(struct xenbus_transaction t,
|
|
const char *dir, const char *node);
|
|
int xenbus_rm(struct xenbus_transaction t, const char *dir, const char *node);
|
|
int xenbus_transaction_start(struct xenbus_transaction *t);
|
|
int xenbus_transaction_end(struct xenbus_transaction t, int abort);
|
|
|
|
/* Single read and scanf: returns -errno or num scanned if > 0. */
|
|
__scanf(4, 5)
|
|
int xenbus_scanf(struct xenbus_transaction t,
|
|
const char *dir, const char *node, const char *fmt, ...);
|
|
|
|
/* Read an (optional) unsigned value. */
|
|
unsigned int xenbus_read_unsigned(const char *dir, const char *node,
|
|
unsigned int default_val);
|
|
|
|
/* Single printf and write: returns -errno or 0. */
|
|
__printf(4, 5)
|
|
int xenbus_printf(struct xenbus_transaction t,
|
|
const char *dir, const char *node, const char *fmt, ...);
|
|
|
|
/* Generic read function: NULL-terminated triples of name,
|
|
* sprintf-style type string, and pointer. Returns 0 or errno.*/
|
|
int xenbus_gather(struct xenbus_transaction t, const char *dir, ...);
|
|
|
|
/* notifer routines for when the xenstore comes up */
|
|
extern int xenstored_ready;
|
|
int register_xenstore_notifier(struct notifier_block *nb);
|
|
void unregister_xenstore_notifier(struct notifier_block *nb);
|
|
|
|
int register_xenbus_watch(struct xenbus_watch *watch);
|
|
void unregister_xenbus_watch(struct xenbus_watch *watch);
|
|
void xs_suspend(void);
|
|
void xs_resume(void);
|
|
void xs_suspend_cancel(void);
|
|
|
|
struct work_struct;
|
|
|
|
#define XENBUS_IS_ERR_READ(str) ({ \
|
|
if (!IS_ERR(str) && strlen(str) == 0) { \
|
|
kfree(str); \
|
|
str = ERR_PTR(-ERANGE); \
|
|
} \
|
|
IS_ERR(str); \
|
|
})
|
|
|
|
#define XENBUS_EXIST_ERR(err) ((err) == -ENOENT || (err) == -ERANGE)
|
|
|
|
int xenbus_watch_path(struct xenbus_device *dev, const char *path,
|
|
struct xenbus_watch *watch,
|
|
bool (*will_handle)(struct xenbus_watch *,
|
|
const char *, const char *),
|
|
void (*callback)(struct xenbus_watch *,
|
|
const char *, const char *));
|
|
__printf(5, 6)
|
|
int xenbus_watch_pathfmt(struct xenbus_device *dev, struct xenbus_watch *watch,
|
|
bool (*will_handle)(struct xenbus_watch *,
|
|
const char *, const char *),
|
|
void (*callback)(struct xenbus_watch *,
|
|
const char *, const char *),
|
|
const char *pathfmt, ...);
|
|
|
|
int xenbus_switch_state(struct xenbus_device *dev, enum xenbus_state new_state);
|
|
int xenbus_grant_ring(struct xenbus_device *dev, void *vaddr,
|
|
unsigned int nr_pages, grant_ref_t *grefs);
|
|
int xenbus_map_ring_valloc(struct xenbus_device *dev, grant_ref_t *gnt_refs,
|
|
unsigned int nr_grefs, void **vaddr);
|
|
|
|
int xenbus_unmap_ring_vfree(struct xenbus_device *dev, void *vaddr);
|
|
|
|
int xenbus_alloc_evtchn(struct xenbus_device *dev, evtchn_port_t *port);
|
|
int xenbus_free_evtchn(struct xenbus_device *dev, evtchn_port_t port);
|
|
|
|
enum xenbus_state xenbus_read_driver_state(const char *path);
|
|
|
|
__printf(3, 4)
|
|
void xenbus_dev_error(struct xenbus_device *dev, int err, const char *fmt, ...);
|
|
__printf(3, 4)
|
|
void xenbus_dev_fatal(struct xenbus_device *dev, int err, const char *fmt, ...);
|
|
|
|
const char *xenbus_strstate(enum xenbus_state state);
|
|
int xenbus_dev_is_online(struct xenbus_device *dev);
|
|
int xenbus_frontend_closed(struct xenbus_device *dev);
|
|
|
|
extern const struct file_operations xen_xenbus_fops;
|
|
extern struct xenstore_domain_interface *xen_store_interface;
|
|
extern int xen_store_evtchn;
|
|
|
|
#endif /* _XEN_XENBUS_H */
|