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Date: Mon, 3 Jul 2017 14:08:24 -0700 From: Stefano Stabellini <sstabellini@...nel.org> To: xen-devel@...ts.xen.org Cc: linux-kernel@...r.kernel.org, sstabellini@...nel.org, jgross@...e.com, boris.ostrovsky@...cle.com, Stefano Stabellini <stefano@...reto.com> Subject: [PATCH v6 03/18] 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@...reto.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com> CC: boris.ostrovsky@...cle.com CC: jgross@...e.com --- drivers/xen/pvcalls-back.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c index f3d0daa..9044cf2 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 int pvcalls_back_uevent(struct xenbus_device *xdev, .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); -- 1.9.1
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