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ANDROID: usb: Add vendor hook for usb suspend and resume

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Add the hook that vendor can design and bypass the suspend/resume.
When the bypass is set, skip the orignal suspend/resume methods.

In mobile, a co-processor can be used with USB audio, and ACPU may
be able to sleep in such condition to improve power consumption.
We will need vendor hook to support this.

Bug: 192774581
Signed-off-by: Puma Hsu <pumahsu@google.com>
Change-Id: Ic62a8a1e662bbe3fb0aa17af7491daace0b9f18a
This commit is contained in:
Puma Hsu 2021-07-10 16:11:10 +08:00
parent 956db89e71
commit 98085b5dd8
3 changed files with 42 additions and 0 deletions
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3
drivers/android/vendor_hooks.c
View File

@ -67,6 +67,7 @@
#include <trace/hooks/shmem_fs.h>
#include <trace/hooks/net.h>
#include <trace/hooks/syscall_check.h>
#include <trace/hooks/usb.h>
/*
* Export tracepoints that act as a bare tracehook (ie: have no trace event
@ -350,3 +351,5 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_kfree_skb);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_check_mmap_file);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_check_file_open);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_check_bpf_syscall);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_usb_dev_suspend);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_usb_dev_resume);

12
drivers/usb/core/driver.c
View File

@ -34,6 +34,7 @@
#include "usb.h"
#include <trace/hooks/usb.h>
/*
* Adds a new dynamic USBdevice ID to this driver,
@ -1403,11 +1404,16 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
int status = 0;
int i = 0, n = 0;
struct usb_interface *intf;
int bypass = 0;
if (udev->state == USB_STATE_NOTATTACHED ||
udev->state == USB_STATE_SUSPENDED)
goto done;
trace_android_vh_usb_dev_suspend(udev, msg, &bypass);
if (bypass)
goto done;
/* Suspend all the interfaces and then udev itself */
if (udev->actconfig) {
n = udev->actconfig->desc.bNumInterfaces;
@ -1504,11 +1510,17 @@ static int usb_resume_both(struct usb_device *udev, pm_message_t msg)
int status = 0;
int i;
struct usb_interface *intf;
int bypass = 0;
if (udev->state == USB_STATE_NOTATTACHED) {
status = -ENODEV;
goto done;
}
trace_android_vh_usb_dev_resume(udev, msg, &bypass);
if (bypass)
goto done;
udev->can_submit = 1;
/* Resume the device */

27
include/trace/hooks/usb.h Normal file
View File

@ -0,0 +1,27 @@
/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM usb
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH trace/hooks
#if !defined(_TRACE_HOOK_USB_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_HOOK_USB_H
#include <linux/tracepoint.h>
#include <linux/usb.h>
#include <trace/hooks/vendor_hooks.h>
/*
* Following tracepoints are not exported in tracefs and provide a
* mechanism for vendor modules to hook and extend functionality
*/
DECLARE_HOOK(android_vh_usb_dev_suspend,
TP_PROTO(struct usb_device *udev, pm_message_t msg, int *bypass),
TP_ARGS(udev, msg, bypass));
DECLARE_HOOK(android_vh_usb_dev_resume,
TP_PROTO(struct usb_device *udev, pm_message_t msg, int *bypass),
TP_ARGS(udev, msg, bypass));
#endif /* _TRACE_HOOK_USB_H */
/* This part must be outside protection */
#include <trace/define_trace.h>