linux-kernel - [PATCH v2] kcov, usbip: collect coverage from vhci_rx

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Message-Id: <c07a2deae7a75e394de272c1a33cfcc1f667af92.1602522185.git.andreyknvl@google.com>
Date:   Mon, 12 Oct 2020 19:10:21 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alan Stern <stern@...land.harvard.edu>,
        Shuah Khan <shuah@...nel.org>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Aleksandr Nogikh <nogikh@...gle.com>,
        Nazime Hande Harputluoglu <handeharput@...il.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Nazime Hande Harputluoglu <handeharputlu@...gle.com>
Subject: [PATCH v2] kcov, usbip: collect coverage from vhci_rx_loop

From: Nazime Hande Harputluoglu <handeharputlu@...gle.com>

Add kcov_remote_start()/kcov_remote_stop() annotations to the
vhci_rx_loop() function, which is responsible for parsing USB/IP packets
coming into USB/IP client.

Since vhci_rx_loop() threads are spawned per vhci_hcd device instance, the
common kcov handle is used for kcov_remote_start()/stop() annotations
(see Documentation/dev-tools/kcov.rst for details). As the result kcov
can now be used to collect coverage from vhci_rx_loop() threads.

Signed-off-by: Nazime Hande Harputluoglu <handeharputlu@...gle.com>
---

Changes v1->v2:
- Fix spacing issues.
- Add ifdef CONFIG_KCOV around kcov_handle in usbip_device struct.

---
 drivers/usb/usbip/usbip_common.h |  4 ++++
 drivers/usb/usbip/vhci_rx.c      |  3 +++
 drivers/usb/usbip/vhci_sysfs.c   | 12 +++++++-----
 3 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/usbip/usbip_common.h b/drivers/usb/usbip/usbip_common.h
index 8be857a4fa13..0906182011d6 100644
--- a/drivers/usb/usbip/usbip_common.h
+++ b/drivers/usb/usbip/usbip_common.h
@@ -277,6 +277,10 @@ struct usbip_device {
 		void (*reset)(struct usbip_device *);
 		void (*unusable)(struct usbip_device *);
 	} eh_ops;
+
+#ifdef CONFIG_KCOV
+	u64 kcov_handle;
+#endif
 };
 
 #define kthread_get_run(threadfn, data, namefmt, ...)			   \
diff --git a/drivers/usb/usbip/vhci_rx.c b/drivers/usb/usbip/vhci_rx.c
index 266024cbb64f..473f14587bd5 100644
--- a/drivers/usb/usbip/vhci_rx.c
+++ b/drivers/usb/usbip/vhci_rx.c
@@ -3,6 +3,7 @@
  * Copyright (C) 2003-2008 Takahiro Hirofuchi
  */
 
+#include <linux/kcov.h>
 #include <linux/kthread.h>
 #include <linux/slab.h>
 
@@ -261,7 +262,9 @@ int vhci_rx_loop(void *data)
 		if (usbip_event_happened(ud))
 			break;
 
+		kcov_remote_start_common(ud->kcov_handle);
 		vhci_rx_pdu(ud);
+		kcov_remote_stop();
 	}
 
 	return 0;
diff --git a/drivers/usb/usbip/vhci_sysfs.c b/drivers/usb/usbip/vhci_sysfs.c
index be37aec250c2..966f1f5cafb1 100644
--- a/drivers/usb/usbip/vhci_sysfs.c
+++ b/drivers/usb/usbip/vhci_sysfs.c
@@ -4,6 +4,7 @@
  * Copyright (C) 2015-2016 Nobuo Iwata
  */
 
+#include <linux/kcov.h>
 #include <linux/kthread.h>
 #include <linux/file.h>
 #include <linux/net.h>
@@ -378,11 +379,12 @@ static ssize_t attach_store(struct device *dev, struct device_attribute *attr,
 	dev_info(dev, "devid(%u) speed(%u) speed_str(%s)\n",
 		 devid, speed, usb_speed_string(speed));
 
-	vdev->devid         = devid;
-	vdev->speed         = speed;
-	vdev->ud.sockfd     = sockfd;
-	vdev->ud.tcp_socket = socket;
-	vdev->ud.status     = VDEV_ST_NOTASSIGNED;
+	vdev->devid          = devid;
+	vdev->speed          = speed;
+	vdev->ud.sockfd      = sockfd;
+	vdev->ud.tcp_socket  = socket;
+	vdev->ud.status      = VDEV_ST_NOTASSIGNED;
+	vdev->ud.kcov_handle = kcov_common_handle();
 
 	spin_unlock(&vdev->ud.lock);
 	spin_unlock_irqrestore(&vhci->lock, flags);
-- 
2.28.0.1011.ga647a8990f-goog