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| author | Stefano Stabellini <sstabellini@kernel.org> | 2017-07-05 13:08:48 -0700 |
|---|---|---|
| committer | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2017-08-31 09:45:55 -0400 |
| commit | 9be07334f99e1f9e0b244d73528bc3afce126735 (patch) | |
| tree | f19c721f4fe8fea6142e14e61bcaad20bc5622bf /drivers/xen/pvcalls-back.c | |
| parent | 72e59c30df449bc7fe601716e60c824b4ffe606d (diff) | |
| download | lwn-9be07334f99e1f9e0b244d73528bc3afce126735.tar.gz lwn-9be07334f99e1f9e0b244d73528bc3afce126735.zip | |
xen/pvcalls: initialize the module and register the xenbus backend
Keep a list of connected frontends. Use a semaphore to protect list
accesses.
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
CC: boris.ostrovsky@oracle.com
CC: jgross@suse.com
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'drivers/xen/pvcalls-back.c')
| -rw-r--r-- | drivers/xen/pvcalls-back.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c index f3d0daad3da6..9044cf21b31c 100644 --- a/drivers/xen/pvcalls-back.c +++ b/drivers/xen/pvcalls-back.c @@ -25,6 +25,11 @@ #include <xen/xenbus.h> #include <xen/interface/io/pvcalls.h> +struct pvcalls_back_global { + struct list_head frontends; + struct semaphore frontends_lock; +} pvcalls_back_global; + static int pvcalls_back_probe(struct xenbus_device *dev, const struct xenbus_device_id *id) { @@ -59,3 +64,20 @@ static struct xenbus_driver pvcalls_back_driver = { .uevent = pvcalls_back_uevent, .otherend_changed = pvcalls_back_changed, }; + +static int __init pvcalls_back_init(void) +{ + int ret; + + if (!xen_domain()) + return -ENODEV; + + ret = xenbus_register_backend(&pvcalls_back_driver); + if (ret < 0) + return ret; + + sema_init(&pvcalls_back_global.frontends_lock, 1); + INIT_LIST_HEAD(&pvcalls_back_global.frontends); + return 0; +} +module_init(pvcalls_back_init); |