From patchwork Wed Sep 13 13:25:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonathan Cameron X-Patchwork-Id: 13383014 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 840E5EDEC50 for ; Wed, 13 Sep 2023 13:25:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236214AbjIMNZa (ORCPT ); Wed, 13 Sep 2023 09:25:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54048 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234046AbjIMNZa (ORCPT ); Wed, 13 Sep 2023 09:25:30 -0400 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5527B19B1 for ; Wed, 13 Sep 2023 06:25:26 -0700 (PDT) Received: from lhrpeml500005.china.huawei.com (unknown [172.18.147.206]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4Rm1Kn0Z7bz6D9BZ; Wed, 13 Sep 2023 21:20:45 +0800 (CST) Received: from SecurePC-101-06.china.huawei.com (10.122.247.231) by lhrpeml500005.china.huawei.com (7.191.163.240) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.31; Wed, 13 Sep 2023 14:25:24 +0100 From: Jonathan Cameron To: , Michael Tsirkin , Fan Ni , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , CC: Subject: [PATCH v4 0/4] hw/cxl: Support emulating 4 HDM decoders throughout topology Date: Wed, 13 Sep 2023 14:25:19 +0100 Message-ID: <20230913132523.29780-1-Jonathan.Cameron@huawei.com> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 X-Originating-IP: [10.122.247.231] X-ClientProxiedBy: lhrpeml100004.china.huawei.com (7.191.162.219) To lhrpeml500005.china.huawei.com (7.191.163.240) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-cxl@vger.kernel.org v4: Thanks to Fan and Philippe for reviews. - Add specification reference for interleave ways encodings - Gathered tags. Note I'm sending this out quicker than I normally would because I want to post another series on top of it and the additional comment will add some fuzz for that. For initial CXL emulation / kernel driver bring up a single Host-managed Device Memory (HDM) decoder instance was sufficient as it let us test the basic region creation code etc. More complex testing appropriate today requires a more realistic configuration with multiple decoders. The Linux kernel will use separate decoders for each memory type (and shortly per DCD region) and for each interleave set within a memory type or DCD region. 4 decoders are sufficient for most test cases today but we may need to grow these further in future. This patch set already allowed us to identify one kernel bug which is now fixed. https://lore.kernel.org/linux-cxl/168696507968.3590522.14484000711718573626.stgit@dwillia2-xfh.jf.intel.com/ Note that, whilst I'm proposing this series for upstream (based on priorities of what we have out of tree) it hasn't previously been posted so needs review. (I failed to send it out previously) Based on: [PATCH 0/4] hw/cxl: Minor CXL emulation fixes and cleanup Based on: [PATCH v2 0/3] hw/cxl: Add dummy ACPI QTG DSM Based on: Message ID: 20230904132806.6094-1-Jonathan.Cameron@huawei.com Based on: Message ID: 20230904161847.18468-1-Jonathan.Cameron@huawei.com Jonathan Cameron (4): hw/cxl: Push cxl_decoder_count_enc() and cxl_decode_ig() into .c hw/cxl: Add utility functions decoder interleave ways and target count. hw/cxl: Fix and use same calculation for HDM decoder block size everywhere hw/cxl: Support 4 HDM decoders at all levels of topology include/hw/cxl/cxl_component.h | 30 +++++----- hw/cxl/cxl-component-utils.c | 92 +++++++++++++++++++++++++---- hw/cxl/cxl-host.c | 67 +++++++++++++++------- hw/mem/cxl_type3.c | 102 +++++++++++++++++++++++---------- 4 files changed, 213 insertions(+), 78 deletions(-)