From patchwork Mon Sep 11 11:43:09 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonathan Cameron X-Patchwork-Id: 13379228 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 932B8EE57DF for ; Mon, 11 Sep 2023 11:44:12 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qffKF-0005oV-HR; Mon, 11 Sep 2023 07:43:31 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qffKE-0005o7-6F for qemu-devel@nongnu.org; Mon, 11 Sep 2023 07:43:30 -0400 Received: from frasgout.his.huawei.com ([185.176.79.56]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qffK3-0001xZ-9W for qemu-devel@nongnu.org; Mon, 11 Sep 2023 07:43:29 -0400 Received: from lhrpeml500005.china.huawei.com (unknown [172.18.147.207]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4RklDK2PSbz67FSP; Mon, 11 Sep 2023 19:41:37 +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, 11 Sep 2023 12:43:13 +0100 To: , Michael Tsirkin , Fan Ni , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , CC: Subject: [PATCH v3 0/4] hw/cxl: Support emulating 4 HDM decoders throughout topology Date: Mon, 11 Sep 2023 12:43:09 +0100 Message-ID: <20230911114313.6144-1-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: lhrpeml500002.china.huawei.com (7.191.160.78) To lhrpeml500005.china.huawei.com (7.191.163.240) X-CFilter-Loop: Reflected Received-SPF: pass client-ip=185.176.79.56; envelope-from=jonathan.cameron@huawei.com; helo=frasgout.his.huawei.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-to: Jonathan Cameron X-Patchwork-Original-From: Jonathan Cameron via From: Jonathan Cameron Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org v3: Thanks to Philippe. - Pull the hdm_inc change out as a precursor to the increase in HDM decoders (new patch: 3) - Fix a bug where cxl-host used the encoded count as if it were the decoded version. 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 | 91 +++++++++++++++++++++++++---- hw/cxl/cxl-host.c | 67 +++++++++++++++------- hw/mem/cxl_type3.c | 102 +++++++++++++++++++++++---------- 4 files changed, 212 insertions(+), 78 deletions(-)