From 95d23dc27bde0ab4b25f7ade5e2fddc08dd97d9b Mon Sep 17 00:00:00 2001 From: Andrey Konovalov Date: Wed, 4 Dec 2019 16:52:47 -0800 Subject: usb, kcov: collect coverage from hub_event Add kcov_remote_start()/kcov_remote_stop() annotations to the hub_event() function, which is responsible for processing events on USB buses, in particular events that happen during USB device enumeration. Since hub_event() is run in a global background kernel thread (see Documentation/dev-tools/kcov.rst for details), each USB bus gets a unique global handle from the USB subsystem kcov handle range. As the result kcov can now be used to collect coverage from events that happen on a particular USB bus. [akpm@linux-foundation.org: avoid patch conflicts to make life easier for Andrew] Link: http://lkml.kernel.org/r/de4fe1c219db2d002d905dc1736e2a3bfa1db997.1572366574.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov Reviewed-by: Greg Kroah-Hartman Cc: Alan Stern Cc: Alexander Potapenko Cc: Anders Roxell Cc: Arnd Bergmann Cc: David Windsor Cc: Dmitry Vyukov Cc: Elena Reshetova Cc: Jason Wang Cc: Marco Elver Cc: "Michael S. Tsirkin" Cc: Steven Rostedt Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/usb/core/hub.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'drivers/usb') diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 1709895387b9..f229ad6952c0 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include #include @@ -5484,6 +5485,8 @@ static void hub_event(struct work_struct *work) hub_dev = hub->intfdev; intf = to_usb_interface(hub_dev); + kcov_remote_start_usb((u64)hdev->bus->busnum); + dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", hdev->state, hdev->maxchild, /* NOTE: expects max 15 ports... */ @@ -5590,6 +5593,8 @@ out_hdev_lock: /* Balance the stuff in kick_hub_wq() and allow autosuspend */ usb_autopm_put_interface(intf); kref_put(&hub->kref, hub_release); + + kcov_remote_stop(); } static const struct usb_device_id hub_id_table[] = { -- cgit