From patchwork Mon Sep 4 16:47:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonathan Cameron X-Patchwork-Id: 13374215 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 247F9C71153 for ; Mon, 4 Sep 2023 16:47:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240474AbjIDQrN (ORCPT ); Mon, 4 Sep 2023 12:47:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58180 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237790AbjIDQrN (ORCPT ); Mon, 4 Sep 2023 12:47:13 -0400 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BE12E199 for ; Mon, 4 Sep 2023 09:47:07 -0700 (PDT) Received: from lhrpeml500005.china.huawei.com (unknown [172.18.147.207]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4RfZKw4V4fz6K6ms; Tue, 5 Sep 2023 00:47:00 +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; Mon, 4 Sep 2023 17:47:04 +0100 From: Jonathan Cameron To: , Michael Tsirkin , Fan Ni , CC: Dave Jiang , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Subject: [PATCH 0/2] hw/cxl: Support emulating 4 HDM decoders throughout topology Date: Mon, 4 Sep 2023 17:47:02 +0100 Message-ID: <20230904164704.18739-1-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: lhrpeml100005.china.huawei.com (7.191.160.25) 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 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 (2): hw/cxl: Add utility functions decoder interleave ways and target count. hw/cxl: Support 4 HDM decoders at all levels of topology include/hw/cxl/cxl_component.h | 21 ++++++++ hw/cxl/cxl-component-utils.c | 43 +++++++++++---- hw/cxl/cxl-host.c | 65 +++++++++++++++-------- hw/mem/cxl_type3.c | 97 +++++++++++++++++++++++----------- 4 files changed, 164 insertions(+), 62 deletions(-)