mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-24 01:04:07 +07:00
4097461897
As explained in 1407814240-4275-1-git-send-email-decui@microsoft.com we have a hard load dependency between i8042 and atkbd which prevents keyboard from working on Gen2 Hyper-V VMs. > hyperv_keyboard invokes serio_interrupt(), which needs a valid serio > driver like atkbd.c. atkbd.c depends on libps2.c because it invokes > ps2_command(). libps2.c depends on i8042.c because it invokes > i8042_check_port_owner(). As a result, hyperv_keyboard actually > depends on i8042.c. > > For a Generation 2 Hyper-V VM (meaning no i8042 device emulated), if a > Linux VM (like Arch Linux) happens to configure CONFIG_SERIO_I8042=m > rather than =y, atkbd.ko can't load because i8042.ko can't load(due to > no i8042 device emulated) and finally hyperv_keyboard can't work and > the user can't input: https://bugs.archlinux.org/task/39820 > (Ubuntu/RHEL/SUSE aren't affected since they use CONFIG_SERIO_I8042=y) To break the dependency we move away from using i8042_check_port_owner() and instead allow serio port owner specify a mutex that clients should use to serialize PS/2 command stream. Reported-by: Mark Laws <mdl@60hz.org> Tested-by: Mark Laws <mdl@60hz.org> Cc: stable@vger.kernel.org Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
100 lines
2.1 KiB
C
100 lines
2.1 KiB
C
#ifndef _LINUX_I8042_H
|
|
#define _LINUX_I8042_H
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
|
|
/*
|
|
* Standard commands.
|
|
*/
|
|
|
|
#define I8042_CMD_CTL_RCTR 0x0120
|
|
#define I8042_CMD_CTL_WCTR 0x1060
|
|
#define I8042_CMD_CTL_TEST 0x01aa
|
|
|
|
#define I8042_CMD_KBD_DISABLE 0x00ad
|
|
#define I8042_CMD_KBD_ENABLE 0x00ae
|
|
#define I8042_CMD_KBD_TEST 0x01ab
|
|
#define I8042_CMD_KBD_LOOP 0x11d2
|
|
|
|
#define I8042_CMD_AUX_DISABLE 0x00a7
|
|
#define I8042_CMD_AUX_ENABLE 0x00a8
|
|
#define I8042_CMD_AUX_TEST 0x01a9
|
|
#define I8042_CMD_AUX_SEND 0x10d4
|
|
#define I8042_CMD_AUX_LOOP 0x11d3
|
|
|
|
#define I8042_CMD_MUX_PFX 0x0090
|
|
#define I8042_CMD_MUX_SEND 0x1090
|
|
|
|
/*
|
|
* Status register bits.
|
|
*/
|
|
|
|
#define I8042_STR_PARITY 0x80
|
|
#define I8042_STR_TIMEOUT 0x40
|
|
#define I8042_STR_AUXDATA 0x20
|
|
#define I8042_STR_KEYLOCK 0x10
|
|
#define I8042_STR_CMDDAT 0x08
|
|
#define I8042_STR_MUXERR 0x04
|
|
#define I8042_STR_IBF 0x02
|
|
#define I8042_STR_OBF 0x01
|
|
|
|
/*
|
|
* Control register bits.
|
|
*/
|
|
|
|
#define I8042_CTR_KBDINT 0x01
|
|
#define I8042_CTR_AUXINT 0x02
|
|
#define I8042_CTR_IGNKEYLOCK 0x08
|
|
#define I8042_CTR_KBDDIS 0x10
|
|
#define I8042_CTR_AUXDIS 0x20
|
|
#define I8042_CTR_XLATE 0x40
|
|
|
|
struct serio;
|
|
|
|
#if defined(CONFIG_SERIO_I8042) || defined(CONFIG_SERIO_I8042_MODULE)
|
|
|
|
void i8042_lock_chip(void);
|
|
void i8042_unlock_chip(void);
|
|
int i8042_command(unsigned char *param, int command);
|
|
int i8042_install_filter(bool (*filter)(unsigned char data, unsigned char str,
|
|
struct serio *serio));
|
|
int i8042_remove_filter(bool (*filter)(unsigned char data, unsigned char str,
|
|
struct serio *serio));
|
|
|
|
#else
|
|
|
|
static inline void i8042_lock_chip(void)
|
|
{
|
|
}
|
|
|
|
static inline void i8042_unlock_chip(void)
|
|
{
|
|
}
|
|
|
|
static inline int i8042_command(unsigned char *param, int command)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static inline int i8042_install_filter(bool (*filter)(unsigned char data, unsigned char str,
|
|
struct serio *serio))
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static inline int i8042_remove_filter(bool (*filter)(unsigned char data, unsigned char str,
|
|
struct serio *serio))
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif
|