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| author |   Andrey Konovalov <andreyknvl@google.com> | 2019-12-04 16:52:47 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2019-12-04 19:44:14 -0800 |
| commit | 95d23dc27bde0ab4b25f7ade5e2fddc08dd97d9b (patch) | |
| tree | 546b609bf5bd48b1daf54b39195b0127670b1c4e /drivers/usb/core/hub.c | |
| parent | kcov: remote coverage support (diff) | |
| download | linux-dev-95d23dc27bde0ab4b25f7ade5e2fddc08dd97d9b.tar.xz linux-dev-95d23dc27bde0ab4b25f7ade5e2fddc08dd97d9b.zip | |
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 <andreyknvl@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Alexander Potapenko <glider@google.com>
Cc: Anders Roxell <anders.roxell@linaro.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: David Windsor <dwindsor@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Elena Reshetova <elena.reshetova@intel.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Marco Elver <elver@google.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
| -rw-r--r-- | drivers/usb/core/hub.c | 5 |
1 files changed, 5 insertions, 0 deletions
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 <linux/sched/mm.h> #include <linux/list.h> #include <linux/slab.h> +#include <linux/kcov.h> #include <linux/ioctl.h> #include <linux/usb.h> #include <linux/usbdevice_fs.h> @@ -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[] = { |