From patchwork Fri Aug 12 06:54:10 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Xiao Guangrong X-Patchwork-Id: 658675 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3s9nkn5lZSz9t0p for ; Sat, 13 Aug 2016 00:46:09 +1000 (AEST) Received: from localhost ([::1]:52534 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bYDip-0008TP-ET for incoming@patchwork.ozlabs.org; Fri, 12 Aug 2016 10:46:07 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33213) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bYDKh-0004cT-IG for qemu-devel@nongnu.org; Fri, 12 Aug 2016 10:21:22 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bYDKS-0001jl-5f for qemu-devel@nongnu.org; Fri, 12 Aug 2016 10:21:10 -0400 Received: from mga04.intel.com ([192.55.52.120]:2220) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bYDKR-0001jM-Ub for qemu-devel@nongnu.org; Fri, 12 Aug 2016 10:20:56 -0400 Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga104.fm.intel.com with ESMTP; 12 Aug 2016 00:07:31 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.28,509,1464678000"; d="scan'208";a="154662677" Received: from xiaoreal1.sh.intel.com (HELO xiaoreal1.sh.intel.com.sh.intel.com) ([10.239.48.133]) by fmsmga004.fm.intel.com with ESMTP; 12 Aug 2016 00:07:27 -0700 From: Xiao Guangrong To: pbonzini@redhat.com, imammedo@redhat.com Date: Fri, 12 Aug 2016 14:54:10 +0800 Message-Id: <1470984850-66891-9-git-send-email-guangrong.xiao@linux.intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1470984850-66891-1-git-send-email-guangrong.xiao@linux.intel.com> References: <1470984850-66891-1-git-send-email-guangrong.xiao@linux.intel.com> MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 192.55.52.120 Subject: [Qemu-devel] [PATCH v2 8/8] nvdimm docs: add nvdimm Read FIT function X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Xiao Guangrong , ehabkost@redhat.com, kvm@vger.kernel.org, mst@redhat.com, gleb@kernel.org, mtosatti@redhat.com, qemu-devel@nongnu.org, stefanha@redhat.com, dan.j.williams@intel.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Add the specification of Read FIT function Signed-off-by: Xiao Guangrong --- docs/specs/acpi_nvdimm.txt | 38 +++++++++++++++++++++++++++++++++++--- 1 file changed, 35 insertions(+), 3 deletions(-) diff --git a/docs/specs/acpi_nvdimm.txt b/docs/specs/acpi_nvdimm.txt index 0fdd251..1a31b19 100644 --- a/docs/specs/acpi_nvdimm.txt +++ b/docs/specs/acpi_nvdimm.txt @@ -127,6 +127,38 @@ _DSM process diagram: | result from the page | | | +--------------------------+ +--------------+ - _FIT implementation - ------------------- - TODO (will fill it when nvdimm hotplug is introduced) + QEMU internal use only _DSM function + ------------------------------------ + There is the function introduced by QEMU and only used by QEMU internal. + + 1) Read FIT + As we only reserved one page for NVDIMM ACPI it is impossible to map the + whole FIT data to guest's address space. This function is for NVDIMM root + device and is used by _FIT method to read a piece of FIT data from QEMU. + + Input parameters: + Arg0 – UUID {set to 2f10e7a4-9e91-11e4-89d3-123b93f75cba} + Arg1 – Revision ID (set to 1) + Arg2 - 0xFFFFFFFF + Arg3 - A package containing a buffer whose layout is as follows: + + +----------+-------------+-------------+-----------------------------------+ + | Filed | Byte Length | Byte Offset | Description | + +----------+-------------+-------------+-----------------------------------+ + | offset | 4 | 0 | the offset of FIT buffer | + +----------+-------------+-------------+-----------------------------------+ + + Output: + +----------+-------------+-------------+-----------------------------------+ + | Filed | Byte Length | Byte Offset | Description | + +----------+-------------+-------------+-----------------------------------+ + | status | 4 | 0 | return status codes following | + | | | | Chapter 3 in DSM Spec Rev1 | + +----------+-------------+-------------+-----------------------------------+ + | fit data | Varies | 8 | FIT data | + | | | | | + +----------+-------------+-------------+-----------------------------------+ + + The FIT offset is maintained by the caller itself, current offset plugs + the length returned by the function is the next offset we should read. + When all the FIT data has been read out, zero length is returned.