The patch titled
Subject: usb, kcov: collect coverage from hub_event
has been added to the -mm tree. Its filename is
usb-kcov-collect-coverage-from-hub_event.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/usb-kcov-collect-coverage-from-hub_event.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/usb-kcov-collect-coverage-from-hub_event.patch
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------------------------------------------------------
From: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Subject: usb, kcov: collect coverage from hub_event
Add kcov_remote_start()/kcov_remote_stop() annotations to hub_event(),
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 id from the USB subsystem kcov handle id range. As the
result kcov can now be used to collect coverage from events that happen on
a particular USB bus.
Link: http://lkml.kernel.org/r/7ac106f30b2c1dab4809c75c5ae6efb91b531cce.1571844200.git.andreyknvl@xxxxxxxxxx
Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Anders Roxell <anders.roxell@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: David Windsor <dwindsor@xxxxxxxxx>
Cc: Elena Reshetova <elena.reshetova@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Jason Wang <jasowang@xxxxxxxxxx>
Cc: Marco Elver <elver@xxxxxxxxxx>
Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/usb/core/hub.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/usb/core/hub.c~usb-kcov-collect-coverage-from-hub_event
+++ a/drivers/usb/core/hub.c
@@ -29,6 +29,7 @@
#include <linux/random.h>
#include <linux/pm_qos.h>
#include <linux/kobject.h>
+#include <linux/kcov.h>
#include <linux/uaccess.h>
#include <asm/byteorder.h>
@@ -5374,6 +5375,8 @@ static void hub_event(struct work_struct
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... */
@@ -5480,6 +5483,8 @@ 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[] = {
_
Patches currently in -mm which might be from andreyknvl@xxxxxxxxxx are
kcov-remote-coverage-support.patch
usb-kcov-collect-coverage-from-hub_event.patch
vhost-kcov-collect-coverage-from-vhost_worker.patch
