From: Lv Zheng Subject: [PATCH v2 0/2] ACPI / debugger: Add kernel flushing support Date: Tue, 19 Jul 2016 18:00:31 +0800 Message-ID: References: Return-path: Received: from mga03.intel.com ([134.134.136.65]:58766 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752566AbcGSKAh (ORCPT ); Tue, 19 Jul 2016 06:00:37 -0400 In-Reply-To: Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: "Rafael J. Wysocki" , "Rafael J. Wysocki" , Len Brown Cc: Lv Zheng , Lv Zheng , linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org 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