Merge branch 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 debug updates from Ingo Molnar:
"The biggest update is the addition of USB3 debug port based
early-console.
Greg was fine with the USB changes and with the routing of these
patches:
https://www.spinics.net/lists/linux-usb/msg155093.html"
* 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
usb/doc: Add document for USB3 debug port usage
usb/serial: Add DBC debug device support to usb_debug
x86/earlyprintk: Add support for earlyprintk via USB3 debug port
usb/early: Add driver for xhci debug capability
x86/timers: Add simple udelay calibration
This commit is contained in:
Linus Torvalds
commit
7d6a31c394
|
|
@ -988,6 +988,7 @@
|
|||
earlyprintk=ttySn[,baudrate]
|
||||
earlyprintk=dbgp[debugController#]
|
||||
earlyprintk=pciserial,bus:device.function[,baudrate]
|
||||
earlyprintk=xdbc[xhciController#]
|
||||
|
||||
earlyprintk is useful when the kernel crashes before
|
||||
the normal console is initialized. It is not enabled by
|
||||
|
|
|
|||
|
|
@ -0,0 +1,100 @@
|
|||
===============
|
||||
USB3 debug port
|
||||
===============
|
||||
|
||||
:Author: Lu Baolu <baolu.lu@linux.intel.com>
|
||||
:Date: March 2017
|
||||
|
||||
GENERAL
|
||||
=======
|
||||
|
||||
This is a HOWTO for using the USB3 debug port on x86 systems.
|
||||
|
||||
Before using any kernel debugging functionality based on USB3
|
||||
debug port, you need to::
|
||||
|
||||
1) check whether any USB3 debug port is available in
|
||||
your system;
|
||||
2) check which port is used for debugging purposes;
|
||||
3) have a USB 3.0 super-speed A-to-A debugging cable.
|
||||
|
||||
INTRODUCTION
|
||||
============
|
||||
|
||||
The xHCI debug capability (DbC) is an optional but standalone
|
||||
functionality provided by the xHCI host controller. The xHCI
|
||||
specification describes DbC in the section 7.6.
|
||||
|
||||
When DbC is initialized and enabled, it will present a debug
|
||||
device through the debug port (normally the first USB3
|
||||
super-speed port). The debug device is fully compliant with
|
||||
the USB framework and provides the equivalent of a very high
|
||||
performance full-duplex serial link between the debug target
|
||||
(the system under debugging) and a debug host.
|
||||
|
||||
EARLY PRINTK
|
||||
============
|
||||
|
||||
DbC has been designed to log early printk messages. One use for
|
||||
this feature is kernel debugging. For example, when your machine
|
||||
crashes very early before the regular console code is initialized.
|
||||
Other uses include simpler, lockless logging instead of a full-
|
||||
blown printk console driver and klogd.
|
||||
|
||||
On the debug target system, you need to customize a debugging
|
||||
kernel with CONFIG_EARLY_PRINTK_USB_XDBC enabled. And, add below
|
||||
kernel boot parameter::
|
||||
|
||||
"earlyprintk=xdbc"
|
||||
|
||||
If there are multiple xHCI controllers in your system, you can
|
||||
append a host contoller index to this kernel parameter. This
|
||||
index starts from 0.
|
||||
|
||||
Current design doesn't support DbC runtime suspend/resume. As
|
||||
the result, you'd better disable runtime power management for
|
||||
USB subsystem by adding below kernel boot parameter::
|
||||
|
||||
"usbcore.autosuspend=-1"
|
||||
|
||||
Before starting the debug target, you should connect the debug
|
||||
port to a USB port (root port or port of any external hub) on
|
||||
the debug host. The cable used to connect these two ports
|
||||
should be a USB 3.0 super-speed A-to-A debugging cable.
|
||||
|
||||
During early boot of the debug target, DbC will be detected and
|
||||
initialized. After initialization, the debug host should be able
|
||||
to enumerate the debug device in debug target. The debug host
|
||||
will then bind the debug device with the usb_debug driver module
|
||||
and create the /dev/ttyUSB device.
|
||||
|
||||
If the debug device enumeration goes smoothly, you should be able
|
||||
to see below kernel messages on the debug host::
|
||||
|
||||
# tail -f /var/log/kern.log
|
||||
[ 1815.983374] usb 4-3: new SuperSpeed USB device number 4 using xhci_hcd
|
||||
[ 1815.999595] usb 4-3: LPM exit latency is zeroed, disabling LPM.
|
||||
[ 1815.999899] usb 4-3: New USB device found, idVendor=1d6b, idProduct=0004
|
||||
[ 1815.999902] usb 4-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
|
||||
[ 1815.999903] usb 4-3: Product: Remote GDB
|
||||
[ 1815.999904] usb 4-3: Manufacturer: Linux
|
||||
[ 1815.999905] usb 4-3: SerialNumber: 0001
|
||||
[ 1816.000240] usb_debug 4-3:1.0: xhci_dbc converter detected
|
||||
[ 1816.000360] usb 4-3: xhci_dbc converter now attached to ttyUSB0
|
||||
|
||||
You can use any communication program, for example minicom, to
|
||||
read and view the messages. Below simple bash scripts can help
|
||||
you to check the sanity of the setup.
|
||||
|
||||
.. code-block:: sh
|
||||
|
||||
===== start of bash scripts =============
|
||||
#!/bin/bash
|
||||
|
||||
while true ; do
|
||||
while [ ! -d /sys/class/tty/ttyUSB0 ] ; do
|
||||
:
|
||||
done
|
||||
cat /dev/ttyUSB0
|
||||
done
|
||||
===== end of bash scripts ===============
|
||||
|
|
@ -5,6 +5,9 @@ config TRACE_IRQFLAGS_SUPPORT
|
|||
|
||||
source "lib/Kconfig.debug"
|
||||
|
||||
config EARLY_PRINTK_USB
|
||||
bool
|
||||
|
||||
config X86_VERBOSE_BOOTUP
|
||||
bool "Enable verbose x86 bootup info messages"
|
||||
default y
|
||||
|
|
@ -23,19 +26,20 @@ config EARLY_PRINTK
|
|||
This is useful for kernel debugging when your machine crashes very
|
||||
early before the console code is initialized. For normal operation
|
||||
it is not recommended because it looks ugly and doesn't cooperate
|
||||
with klogd/syslogd or the X server. You should normally N here,
|
||||
with klogd/syslogd or the X server. You should normally say N here,
|
||||
unless you want to debug such a crash.
|
||||
|
||||
config EARLY_PRINTK_DBGP
|
||||
bool "Early printk via EHCI debug port"
|
||||
depends on EARLY_PRINTK && PCI
|
||||
select EARLY_PRINTK_USB
|
||||
---help---
|
||||
Write kernel log output directly into the EHCI debug port.
|
||||
|
||||
This is useful for kernel debugging when your machine crashes very
|
||||
early before the console code is initialized. For normal operation
|
||||
it is not recommended because it looks ugly and doesn't cooperate
|
||||
with klogd/syslogd or the X server. You should normally N here,
|
||||
with klogd/syslogd or the X server. You should normally say N here,
|
||||
unless you want to debug such a crash. You need usb debug device.
|
||||
|
||||
config EARLY_PRINTK_EFI
|
||||
|
|
@ -48,6 +52,25 @@ config EARLY_PRINTK_EFI
|
|||
This is useful for kernel debugging when your machine crashes very
|
||||
early before the console code is initialized.
|
||||
|
||||
config EARLY_PRINTK_USB_XDBC
|
||||
bool "Early printk via the xHCI debug port"
|
||||
depends on EARLY_PRINTK && PCI
|
||||
select EARLY_PRINTK_USB
|
||||
---help---
|
||||
Write kernel log output directly into the xHCI debug port.
|
||||
|
||||
One use for this feature is kernel debugging, for example when your
|
||||
machine crashes very early before the regular console code is
|
||||
initialized. Other uses include simpler, lockless logging instead of
|
||||
a full-blown printk console driver + klogd.
|
||||
|
||||
For normal production environments this is normally not recommended,
|
||||
because it doesn't feed events into klogd/syslogd and doesn't try to
|
||||
print anything on the screen.
|
||||
|
||||
You should normally say N here, unless you want to debug early
|
||||
crashes or need a very simple printk logging facility.
|
||||
|
||||
config X86_PTDUMP_CORE
|
||||
def_bool n
|
||||
|
||||
|
|
|
|||
|
|
@ -17,6 +17,7 @@
|
|||
#include <asm/intel-mid.h>
|
||||
#include <asm/pgtable.h>
|
||||
#include <linux/usb/ehci_def.h>
|
||||
#include <linux/usb/xhci-dbgp.h>
|
||||
#include <linux/efi.h>
|
||||
#include <asm/efi.h>
|
||||
#include <asm/pci_x86.h>
|
||||
|
|
@ -381,6 +382,10 @@ static int __init setup_early_printk(char *buf)
|
|||
if (!strncmp(buf, "efi", 3))
|
||||
early_console_register(&early_efi_console, keep);
|
||||
#endif
|
||||
#ifdef CONFIG_EARLY_PRINTK_USB_XDBC
|
||||
if (!strncmp(buf, "xdbc", 4))
|
||||
early_xdbc_parse_parameter(buf + 4);
|
||||
#endif
|
||||
|
||||
buf++;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -70,6 +70,7 @@
|
|||
#include <linux/tboot.h>
|
||||
#include <linux/jiffies.h>
|
||||
|
||||
#include <linux/usb/xhci-dbgp.h>
|
||||
#include <video/edid.h>
|
||||
|
||||
#include <asm/mtrr.h>
|
||||
|
|
@ -811,6 +812,26 @@ dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static void __init simple_udelay_calibration(void)
|
||||
{
|
||||
unsigned int tsc_khz, cpu_khz;
|
||||
unsigned long lpj;
|
||||
|
||||
if (!boot_cpu_has(X86_FEATURE_TSC))
|
||||
return;
|
||||
|
||||
cpu_khz = x86_platform.calibrate_cpu();
|
||||
tsc_khz = x86_platform.calibrate_tsc();
|
||||
|
||||
tsc_khz = tsc_khz ? : cpu_khz;
|
||||
if (!tsc_khz)
|
||||
return;
|
||||
|
||||
lpj = tsc_khz * 1000;
|
||||
do_div(lpj, HZ);
|
||||
loops_per_jiffy = lpj;
|
||||
}
|
||||
|
||||
/*
|
||||
* Determine if we were loaded by an EFI loader. If so, then we have also been
|
||||
* passed the efi memmap, systab, etc., so we should use these data structures
|
||||
|
|
@ -959,6 +980,8 @@ void __init setup_arch(char **cmdline_p)
|
|||
*/
|
||||
x86_configure_nx();
|
||||
|
||||
simple_udelay_calibration();
|
||||
|
||||
parse_early_param();
|
||||
|
||||
#ifdef CONFIG_MEMORY_HOTPLUG
|
||||
|
|
@ -1095,6 +1118,9 @@ void __init setup_arch(char **cmdline_p)
|
|||
memblock_set_current_limit(ISA_END_ADDRESS);
|
||||
e820__memblock_setup();
|
||||
|
||||
if (!early_xdbc_setup_hardware())
|
||||
early_xdbc_register_console();
|
||||
|
||||
reserve_bios_regions();
|
||||
|
||||
if (efi_enabled(EFI_MEMMAP)) {
|
||||
|
|
|
|||
|
|
@ -49,7 +49,7 @@ obj-$(CONFIG_USB_MICROTEK) += image/
|
|||
obj-$(CONFIG_USB_SERIAL) += serial/
|
||||
|
||||
obj-$(CONFIG_USB) += misc/
|
||||
obj-$(CONFIG_EARLY_PRINTK_DBGP) += early/
|
||||
obj-$(CONFIG_EARLY_PRINTK_USB) += early/
|
||||
|
||||
obj-$(CONFIG_USB_ATM) += atm/
|
||||
obj-$(CONFIG_USB_SPEEDTOUCH) += atm/
|
||||
|
|
|
|||
|
|
@ -3,3 +3,4 @@
|
|||
#
|
||||
|
||||
obj-$(CONFIG_EARLY_PRINTK_DBGP) += ehci-dbgp.o
|
||||
obj-$(CONFIG_EARLY_PRINTK_USB_XDBC) += xhci-dbc.o
|
||||
|
|
|
|||
File diff suppressed because it is too large
Load Diff
|
|
@ -0,0 +1,211 @@
|
|||
/*
|
||||
* xhci-dbc.h - xHCI debug capability early driver
|
||||
*
|
||||
* Copyright (C) 2016 Intel Corporation
|
||||
*
|
||||
* Author: Lu Baolu <baolu.lu@linux.intel.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#ifndef __LINUX_XHCI_DBC_H
|
||||
#define __LINUX_XHCI_DBC_H
|
||||
|
||||
#include <linux/types.h>
|
||||
#include <linux/usb/ch9.h>
|
||||
|
||||
/*
|
||||
* xHCI Debug Capability Register interfaces:
|
||||
*/
|
||||
struct xdbc_regs {
|
||||
__le32 capability;
|
||||
__le32 doorbell;
|
||||
__le32 ersts; /* Event Ring Segment Table Size*/
|
||||
__le32 __reserved_0; /* 0c~0f reserved bits */
|
||||
__le64 erstba; /* Event Ring Segment Table Base Address */
|
||||
__le64 erdp; /* Event Ring Dequeue Pointer */
|
||||
__le32 control;
|
||||
__le32 status;
|
||||
__le32 portsc; /* Port status and control */
|
||||
__le32 __reserved_1; /* 2b~28 reserved bits */
|
||||
__le64 dccp; /* Debug Capability Context Pointer */
|
||||
__le32 devinfo1; /* Device Descriptor Info Register 1 */
|
||||
__le32 devinfo2; /* Device Descriptor Info Register 2 */
|
||||
};
|
||||
|
||||
#define DEBUG_MAX_BURST(p) (((p) >> 16) & 0xff)
|
||||
|
||||
#define CTRL_DBC_RUN BIT(0)
|
||||
#define CTRL_PORT_ENABLE BIT(1)
|
||||
#define CTRL_HALT_OUT_TR BIT(2)
|
||||
#define CTRL_HALT_IN_TR BIT(3)
|
||||
#define CTRL_DBC_RUN_CHANGE BIT(4)
|
||||
#define CTRL_DBC_ENABLE BIT(31)
|
||||
|
||||
#define DCST_DEBUG_PORT(p) (((p) >> 24) & 0xff)
|
||||
|
||||
#define PORTSC_CONN_STATUS BIT(0)
|
||||
#define PORTSC_CONN_CHANGE BIT(17)
|
||||
#define PORTSC_RESET_CHANGE BIT(21)
|
||||
#define PORTSC_LINK_CHANGE BIT(22)
|
||||
#define PORTSC_CONFIG_CHANGE BIT(23)
|
||||
|
||||
/*
|
||||
* xHCI Debug Capability data structures:
|
||||
*/
|
||||
struct xdbc_trb {
|
||||
__le32 field[4];
|
||||
};
|
||||
|
||||
struct xdbc_erst_entry {
|
||||
__le64 seg_addr;
|
||||
__le32 seg_size;
|
||||
__le32 __reserved_0;
|
||||
};
|
||||
|
||||
struct xdbc_info_context {
|
||||
__le64 string0;
|
||||
__le64 manufacturer;
|
||||
__le64 product;
|
||||
__le64 serial;
|
||||
__le32 length;
|
||||
__le32 __reserved_0[7];
|
||||
};
|
||||
|
||||
struct xdbc_ep_context {
|
||||
__le32 ep_info1;
|
||||
__le32 ep_info2;
|
||||
__le64 deq;
|
||||
__le32 tx_info;
|
||||
__le32 __reserved_0[11];
|
||||
};
|
||||
|
||||
struct xdbc_context {
|
||||
struct xdbc_info_context info;
|
||||
struct xdbc_ep_context out;
|
||||
struct xdbc_ep_context in;
|
||||
};
|
||||
|
||||
#define XDBC_INFO_CONTEXT_SIZE 48
|
||||
#define XDBC_MAX_STRING_LENGTH 64
|
||||
#define XDBC_STRING_MANUFACTURER "Linux"
|
||||
#define XDBC_STRING_PRODUCT "Remote GDB"
|
||||
#define XDBC_STRING_SERIAL "0001"
|
||||
|
||||
struct xdbc_strings {
|
||||
char string0[XDBC_MAX_STRING_LENGTH];
|
||||
char manufacturer[XDBC_MAX_STRING_LENGTH];
|
||||
char product[XDBC_MAX_STRING_LENGTH];
|
||||
char serial[XDBC_MAX_STRING_LENGTH];
|
||||
};
|
||||
|
||||
#define XDBC_PROTOCOL 1 /* GNU Remote Debug Command Set */
|
||||
#define XDBC_VENDOR_ID 0x1d6b /* Linux Foundation 0x1d6b */
|
||||
#define XDBC_PRODUCT_ID 0x0004 /* __le16 idProduct; device 0004 */
|
||||
#define XDBC_DEVICE_REV 0x0010 /* 0.10 */
|
||||
|
||||
/*
|
||||
* xHCI Debug Capability software state structures:
|
||||
*/
|
||||
struct xdbc_segment {
|
||||
struct xdbc_trb *trbs;
|
||||
dma_addr_t dma;
|
||||
};
|
||||
|
||||
#define XDBC_TRBS_PER_SEGMENT 256
|
||||
|
||||
struct xdbc_ring {
|
||||
struct xdbc_segment *segment;
|
||||
struct xdbc_trb *enqueue;
|
||||
struct xdbc_trb *dequeue;
|
||||
u32 cycle_state;
|
||||
};
|
||||
|
||||
#define XDBC_EPID_OUT 2
|
||||
#define XDBC_EPID_IN 3
|
||||
|
||||
struct xdbc_state {
|
||||
u16 vendor;
|
||||
u16 device;
|
||||
u32 bus;
|
||||
u32 dev;
|
||||
u32 func;
|
||||
void __iomem *xhci_base;
|
||||
u64 xhci_start;
|
||||
size_t xhci_length;
|
||||
int port_number;
|
||||
|
||||
/* DbC register base */
|
||||
struct xdbc_regs __iomem *xdbc_reg;
|
||||
|
||||
/* DbC table page */
|
||||
dma_addr_t table_dma;
|
||||
void *table_base;
|
||||
|
||||
/* event ring segment table */
|
||||
dma_addr_t erst_dma;
|
||||
size_t erst_size;
|
||||
void *erst_base;
|
||||
|
||||
/* event ring segments */
|
||||
struct xdbc_ring evt_ring;
|
||||
struct xdbc_segment evt_seg;
|
||||
|
||||
/* debug capability contexts */
|
||||
dma_addr_t dbcc_dma;
|
||||
size_t dbcc_size;
|
||||
void *dbcc_base;
|
||||
|
||||
/* descriptor strings */
|
||||
dma_addr_t string_dma;
|
||||
size_t string_size;
|
||||
void *string_base;
|
||||
|
||||
/* bulk OUT endpoint */
|
||||
struct xdbc_ring out_ring;
|
||||
struct xdbc_segment out_seg;
|
||||
void *out_buf;
|
||||
dma_addr_t out_dma;
|
||||
|
||||
/* bulk IN endpoint */
|
||||
struct xdbc_ring in_ring;
|
||||
struct xdbc_segment in_seg;
|
||||
void *in_buf;
|
||||
dma_addr_t in_dma;
|
||||
|
||||
u32 flags;
|
||||
|
||||
/* spinlock for early_xdbc_write() reentrancy */
|
||||
raw_spinlock_t lock;
|
||||
};
|
||||
|
||||
#define XDBC_PCI_MAX_BUSES 256
|
||||
#define XDBC_PCI_MAX_DEVICES 32
|
||||
#define XDBC_PCI_MAX_FUNCTION 8
|
||||
|
||||
#define XDBC_TABLE_ENTRY_SIZE 64
|
||||
#define XDBC_ERST_ENTRY_NUM 1
|
||||
#define XDBC_DBCC_ENTRY_NUM 3
|
||||
#define XDBC_STRING_ENTRY_NUM 4
|
||||
|
||||
/* Bits definitions for xdbc_state.flags: */
|
||||
#define XDBC_FLAGS_INITIALIZED BIT(0)
|
||||
#define XDBC_FLAGS_IN_STALL BIT(1)
|
||||
#define XDBC_FLAGS_OUT_STALL BIT(2)
|
||||
#define XDBC_FLAGS_IN_PROCESS BIT(3)
|
||||
#define XDBC_FLAGS_OUT_PROCESS BIT(4)
|
||||
#define XDBC_FLAGS_CONFIGURED BIT(5)
|
||||
|
||||
#define XDBC_MAX_PACKET 1024
|
||||
|
||||
/* Door bell target: */
|
||||
#define OUT_EP_DOORBELL 0
|
||||
#define IN_EP_DOORBELL 1
|
||||
#define DOOR_BELL_TARGET(p) (((p) & 0xff) << 8)
|
||||
|
||||
#define xdbc_read64(regs) xhci_read_64(NULL, (regs))
|
||||
#define xdbc_write64(val, regs) xhci_write_64(NULL, (val), (regs))
|
||||
|
||||
#endif /* __LINUX_XHCI_DBC_H */
|
||||
|
|
@ -32,7 +32,18 @@ static const struct usb_device_id id_table[] = {
|
|||
{ USB_DEVICE(0x0525, 0x127a) },
|
||||
{ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(usb, id_table);
|
||||
|
||||
static const struct usb_device_id dbc_id_table[] = {
|
||||
{ USB_DEVICE(0x1d6b, 0x0004) },
|
||||
{ },
|
||||
};
|
||||
|
||||
static const struct usb_device_id id_table_combined[] = {
|
||||
{ USB_DEVICE(0x0525, 0x127a) },
|
||||
{ USB_DEVICE(0x1d6b, 0x0004) },
|
||||
{ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(usb, id_table_combined);
|
||||
|
||||
/* This HW really does not support a serial break, so one will be
|
||||
* emulated when ever the break state is set to true.
|
||||
|
|
@ -71,9 +82,20 @@ static struct usb_serial_driver debug_device = {
|
|||
.process_read_urb = usb_debug_process_read_urb,
|
||||
};
|
||||
|
||||
static struct usb_serial_driver * const serial_drivers[] = {
|
||||
&debug_device, NULL
|
||||
static struct usb_serial_driver dbc_device = {
|
||||
.driver = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "xhci_dbc",
|
||||
},
|
||||
.id_table = dbc_id_table,
|
||||
.num_ports = 1,
|
||||
.break_ctl = usb_debug_break_ctl,
|
||||
.process_read_urb = usb_debug_process_read_urb,
|
||||
};
|
||||
|
||||
module_usb_serial_driver(serial_drivers, id_table);
|
||||
static struct usb_serial_driver * const serial_drivers[] = {
|
||||
&debug_device, &dbc_device, NULL
|
||||
};
|
||||
|
||||
module_usb_serial_driver(serial_drivers, id_table_combined);
|
||||
MODULE_LICENSE("GPL");
|
||||
|
|
|
|||
|
|
@ -0,0 +1,29 @@
|
|||
/*
|
||||
* Standalone xHCI debug capability driver
|
||||
*
|
||||
* Copyright (C) 2016 Intel Corporation
|
||||
*
|
||||
* Author: Lu Baolu <baolu.lu@linux.intel.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#ifndef __LINUX_XHCI_DBGP_H
|
||||
#define __LINUX_XHCI_DBGP_H
|
||||
|
||||
#ifdef CONFIG_EARLY_PRINTK_USB_XDBC
|
||||
int __init early_xdbc_parse_parameter(char *s);
|
||||
int __init early_xdbc_setup_hardware(void);
|
||||
void __init early_xdbc_register_console(void);
|
||||
#else
|
||||
static inline int __init early_xdbc_setup_hardware(void)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
static inline void __init early_xdbc_register_console(void)
|
||||
{
|
||||
}
|
||||
#endif /* CONFIG_EARLY_PRINTK_USB_XDBC */
|
||||
#endif /* __LINUX_XHCI_DBGP_H */
|
||||
Loading…
Reference in New Issue