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

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Message-Id: <cover.1468922310.git.lv.zheng@intel.com>
Date:	Tue, 19 Jul 2016 18:00:31 +0800
From:	Lv Zheng <lv.zheng@...el.com>
To:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>
Cc:	Lv Zheng <lv.zheng@...el.com>, Lv Zheng <zetalog@...il.com>,
	<linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org
Subject: [PATCH v2 0/2] ACPI / debugger: Add kernel flushing support

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

-- 
1.7.10