[PATCH v2 0/2] ACPI / debugger: Add kernel flushing support

From: Lv Zheng
Date: Tue Jul 19 2016 - 06:00:43 EST

AML debugger is implemented in the kernel as a character device located in
the debugfs. Currently, when its batch mode is used, the userspace tool
needs to flush the logs/prompts remained in the kernel output buffer, this
is implemented in an inefficient way in the userspace by polling the IO and
reading everything out.

This patch introduces a kernel space flushing support, so that userspace
can invoke ioctl() to put the driver into a state waiting for new commands,
all kernel space logs/prompts will be automatically discarded by ioctl().

Lv Zheng (2):
ACPI / debugger: Add kernel flushing support
tools/power/acpi/acpidbg: Use new flushing mechanism

drivers/acpi/acpi_dbg.c | 98 ++++++++++++++++++++++++++++--
include/linux/acpi-ioctls.h | 21 +++++++
tools/power/acpi/tools/acpidbg/acpidbg.c | 51 +++-------------
3 files changed, 122 insertions(+), 48 deletions(-)
create mode 100644 include/linux/acpi-ioctls.h