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system: Add support for emulated sysrq

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On keyboard-less design, we will implement a special debug mode,
based on button sequences, to transmit sysrq events to the AP.

This implements the new MKBP event to send sysrq, and a console
command to test it. Later CL will implement debug mode itself.

BRANCH=none
BUG=b:35775099
TEST=sysrq available in EC console
TEST=sysrq h => help message in AP console
TEST=sysrq b => AP reboots

Change-Id: I71d3f77497baf8cc7fac65cd040ce20513b507bc
Reviewed-on: https://chromium-review.googlesource.com/456520
Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Aseda Aboagye <aaboagye@chromium.org>
This commit is contained in:
Nicolas Boichat
2017-03-16 10:24:37 -07:00
committed by chrome-bot
parent 24fd8060fd
commit 871bf8da2c
5 changed files with 51 additions and 0 deletions
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18
common/keyboard_mkbp.c
View File

@@ -90,6 +90,7 @@ static int get_data_size(enum ec_mkbp_event e)
case EC_MKBP_EVENT_HOST_EVENT:
case EC_MKBP_EVENT_BUTTON:
case EC_MKBP_EVENT_SWITCH:
case EC_MKBP_EVENT_SYSRQ:
return sizeof(uint32_t);
default:
/* For unknown types, say it's 0. */
@@ -258,6 +259,15 @@ void keyboard_update_button(enum keyboard_button_type button, int is_pressed)
(const uint8_t *)&mkbp_button_state);
}
#ifdef CONFIG_EMULATED_SYSRQ
void send_sysrq(uint8_t key)
{
uint32_t value = key;
mkbp_fifo_add(EC_MKBP_EVENT_SYSRQ, (const uint8_t *)&value);
}
#endif
#ifdef CONFIG_POWER_BUTTON
/**
* Handle power button changing state.
@@ -325,6 +335,14 @@ static int switch_get_next_event(uint8_t *out)
}
DECLARE_EVENT_SOURCE(EC_MKBP_EVENT_SWITCH, switch_get_next_event);
#ifdef CONFIG_EMULATED_SYSRQ
static int sysrq_get_next_event(uint8_t *out)
{
return get_next_event(out, EC_MKBP_EVENT_SYSRQ);
}
DECLARE_EVENT_SOURCE(EC_MKBP_EVENT_SYSRQ, sysrq_get_next_event);
#endif
void keyboard_send_battery_key(void)
{
uint8_t state[KEYBOARD_COLS];

17
common/system.c
View File

@@ -1109,6 +1109,23 @@ DECLARE_CONSOLE_COMMAND(jumptags, command_jumptags,
"List jump tags");
#endif /* CONFIG_CMD_JUMPTAGS */
#ifdef CONFIG_EMULATED_SYSRQ
static int command_sysrq(int argc, char **argv)
{
char key = 'x';
if (argc > 1 && argv[1])
key = argv[1][0];
send_sysrq(key);
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(sysrq, command_sysrq,
"[key]",
"Simulate sysrq press (default: x)");
#endif /* CONFIG_EMULATED_SYSRQ */
/*****************************************************************************/
/* Host commands */

3
include/config.h
View File

@@ -922,6 +922,9 @@
/* Support EC chip internal data EEPROM */
#undef CONFIG_EEPROM
/* Support for sending emulated sysrq commands to AP */
#undef CONFIG_EMULATED_SYSRQ
/* Support for eSPI for host communication */
#undef CONFIG_ESPI

5
include/ec_commands.h
View File

@@ -2797,6 +2797,9 @@ enum ec_mkbp_event {
/* New Fingerprint sensor event, the event data is fp_events bitmap. */
EC_MKBP_EVENT_FINGERPRINT = 5,
/* Sysrq event */
EC_MKBP_EVENT_SYSRQ = 6,
/* Number of MKBP events */
EC_MKBP_EVENT_COUNT,
};
@@ -2818,6 +2821,8 @@ union __ec_align_offset1 ec_response_get_next_data {
uint32_t switches;
uint32_t fp_events;
uint32_t sysrq;
};
struct __ec_align1 ec_response_get_next_event {

8
include/system.h
View File

@@ -498,4 +498,12 @@ uintptr_t system_get_fw_reset_vector(uintptr_t base);
*/
int system_is_reboot_warm(void);
/*
* Sends an emulated sysrq to the host, used by button-based debug mode.
* Only implemented on top of MKBP protocol.
*
* @param key Key to be sent (e.g. 'x')
*/
void send_sysrq(uint8_t key);
#endif /* __CROS_EC_SYSTEM_H */