Expose the test parameters as part of the debugfs channel attributes.
We will control the testing state via these attributes.
Signed-off-by: Branden Bonaby
---
Changes in v2:
- Move test attributes to debugfs.
- Wrap test code under #ifdef statements.
- Add new documentation file under Documentation/ABI/testing.
- Make commit message reflect the change from from sysfs to debugfs.
Documentation/ABI/testing/debugfs-hyperv | 21 +++
MAINTAINERS | 1 +
drivers/hv/vmbus_drv.c | 167 +++
3 files changed, 189 insertions(+)
create mode 100644 Documentation/ABI/testing/debugfs-hyperv
diff --git a/Documentation/ABI/testing/debugfs-hyperv
b/Documentation/ABI/testing/debugfs-hyperv
new file mode 100644
index ..b25f751fafa8
--- /dev/null
+++ b/Documentation/ABI/testing/debugfs-hyperv
@@ -0,0 +1,21 @@
+What: /sys/kernel/debug/hyperv//fuzz_test_state
+Date: August 2019
+KernelVersion: 5.3
+Contact:Branden Bonaby
+Description:Fuzz testing status of a vmbus device, whether its in an ON
+state or a OFF state
+Users: Debugging tools
+
+What:
/sys/kernel/debug/hyperv//delay/fuzz_test_buffer_interrupt_delay
+Date: August 2019
+KernelVersion: 5.3
+Contact:Branden Bonaby
+Description:Fuzz testing buffer delay value between 0 - 1000
+Users: Debugging tools
+
+What: /sys/kernel/debug/hyperv//delay/fuzz_test_message_delay
+Date: August 2019
+KernelVersion: 5.3
+Contact:Branden Bonaby
+Description:Fuzz testing message delay value between 0 - 1000
+Users: Debugging tools
diff --git a/MAINTAINERS b/MAINTAINERS
index e81e60bd7c26..120284a8185f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7460,6 +7460,7 @@ F:include/uapi/linux/hyperv.h
F: include/asm-generic/mshyperv.h
F: tools/hv/
F: Documentation/ABI/stable/sysfs-bus-vmbus
+F: Documentation/ABI/testing/debugfs-hyperv
HYPERBUS SUPPORT
M: Vignesh Raghavendra
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index ebd35fc35290..b6d023ae9664 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -919,6 +919,10 @@ static void vmbus_device_release(struct device *device)
struct hv_device *hv_dev = device_to_hv_device(device);
struct vmbus_channel *channel = hv_dev->channel;
+#ifdef CONFIG_HYPERV_TESTING
+ hv_debug_rm_dev_dir(hv_dev);
+#endif /* CONFIG_HYPERV_TESTING */
+
mutex_lock(_connection.channel_mutex);
hv_process_channel_removal(channel);
mutex_unlock(_connection.channel_mutex);
@@ -1727,6 +1731,9 @@ int vmbus_device_register(struct hv_device
*child_device_obj)
pr_err("Unable to register primary channeln");
goto err_kset_unregister;
}
+#ifdef CONFIG_HYPERV_TESTING
+ hv_debug_add_dev_dir(child_device_obj);
+#endif /* CONFIG_HYPERV_TESTING */
return 0;
@@ -2086,6 +2093,159 @@ static void hv_crash_handler(struct pt_regs *regs)
hyperv_cleanup();
};
+#ifdef CONFIG_HYPERV_TESTING
+
+struct dentry *hv_root;
+
+static int hv_debugfs_delay_get(void *data, u64 *val)
+{
+ *val = *(u32 *)data;
+ return 0;
+}
+
+static int hv_debugfs_delay_set(void *data, u64 val)
+{
+ if (val >= 1 && val <= 1000)
+ *(u32 *)data = val;
+ /*Best to not use else statement here since we want
+* the delay to remain the same if val > 1000
+*/
+ else if (val <= 0)
+ *(u32 *)data = 0;
+ return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(hv_debugfs_delay_fops, hv_debugfs_delay_get,
+hv_debugfs_delay_set, "%llu\n");
+
+/* Setup delay files to store test values */
+int hv_debug_delay_files(struct hv_device *dev, struct dentry *root)
+{
+ struct vmbus_channel *channel = dev->channel;
+ char *buffer = "fuzz_test_buffer_interrupt_delay";
+ char *message = "fuzz_test_message_delay";
+ int *buffer_val = >fuzz_testing_interrupt_delay;
+ int *message_val = >fuzz_testing_message_delay;
+ struct dentry *buffer_file, *message_file;
+
+ buffer_file = debugfs_create_file(buffer, 0644, root,
+ buffer_val,
+ _debugfs_delay_fops);
+ if (IS_ERR(buffer_file)) {
+ pr_debug("debugfs_hyperv: file %s not created\n", buffer);
+ return PTR_ERR(buffer_file);
+ }
+
+ message_file = debugfs_create_file(message, 0644, root,
+ message_val,
+ _debugfs_delay_fops);
+ if (IS_ERR(message_file)) {
+ pr_debug("debugfs_hyperv: file %s not created\n", message);
+ return PTR_ERR(message_file);
+ }
+
+ return 0;
+}
+
+/* Setup test state value for vmbus device */
