From patchwork Tue Nov 5 10:43:45 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yuquan Wang X-Patchwork-Id: 13862790 Received: from zg8tmtyylji0my4xnjqumte4.icoremail.net (zg8tmtyylji0my4xnjqumte4.icoremail.net [162.243.164.118]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 2A4091CEEB9 for ; Tue, 5 Nov 2024 10:44:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=162.243.164.118 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730803457; cv=none; b=U4sq+Fkvnhm7hjuNyTBtU97ZYxH7e4ulJ461vTOyEF+31Aemzj8xb+5oHA7ZfAqGEGCBP8dYHOv7nrPHHud9NgOYZWE9dh/glYY54GHOaoEO715n9pCFxI3cY+XS8WjO0kAR4wFwBbLXshJTS0rcEDWl321EacEL9/aZ2LkJqRI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730803457; c=relaxed/simple; bh=KLZ4EbFWsT5ayfR2+Bnvyc5m/bgM7O7/lM9JIv2iJco=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=PoaVMX7RrHTGF7TucWW1LdLygISMa9TdV7aLncLP9rMqV8dk55LX+Ygt8pzfmZRske8BheHdY6DUSAeuhtC8XD8GUBveZC5RtJSOn9surHwkJEmRT/8+AVuiHC73tUmCAeexIU6AxtWuEtvK1UdPuR5YwSjJaceeAA+vgtoN8c0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=phytium.com.cn; spf=pass smtp.mailfrom=phytium.com.cn; arc=none smtp.client-ip=162.243.164.118 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=phytium.com.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=phytium.com.cn Received: from prodtpl.icoremail.net (unknown [10.12.1.20]) by hzbj-icmmx-7 (Coremail) with SMTP id AQAAfwAnLR339iln1_+HAw--.38359S2; Tue, 05 Nov 2024 18:44:07 +0800 (CST) Received: from phytium.com.cn (unknown [218.76.62.144]) by mail (Coremail) with SMTP id AQAAfwD3SXb09ilnmo9HAA--.23086S3; Tue, 05 Nov 2024 18:44:05 +0800 (CST) From: Yuquan Wang To: Jonathan.Cameron@Huawei.com, marcin.juszkiewicz@linaro.org, ardb+tianocore@kernel.org, quic_llindhol@quicinc.com, peter.maydell@linaro.org Cc: chenbaozi@phytium.com.cn, devel@edk2.groups.io, linux-cxl@vger.kernel.org, asa-dev@op-lists.linaro.org, qemu-devel@nongnu.org, qemu-arm@nongnu.org, Yuquan Wang Subject: [RFC PATCH v2 0/1] Sbsa-ref CXL Enablement Date: Tue, 5 Nov 2024 18:43:45 +0800 Message-Id: <20241105104346.417102-1-wangyuquan1236@phytium.com.cn> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CM-TRANSID: AQAAfwD3SXb09ilnmo9HAA--.23086S3 X-CM-SenderInfo: 5zdqw5pxtxt0arstlqxsk13x1xpou0fpof0/1tbiAQAAAWcpJZAFkgAIsk Authentication-Results: hzbj-icmmx-7; spf=neutral smtp.mail=wangyuquan 1236@phytium.com.cn; X-Coremail-Antispam: 1Uk129KBjvJXoWxZFW7GrWxZw1DJw17tFy7Jrb_yoWrWrWfpF s0kr43CF48Gw1akws3Z3W8Xr1rCwn5uayUCrn7Cryvkay5GrnYvrZ7Ka1Y9a47JryxGFy3 AF1qywn5u3W5Z3DanT9S1TB71UUUUj7qnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj DUYxn0WfASr-VFAU7a7-sFnT9fnUUIcSsGvfJ3UbIYCTnIWIevJa73UjIFyTuYvj4RJUUU UUUUU v1 -> v2: - provide CXL exclusive MMIO32 & MMIO64 space - hard coded two cxl root ports RFC because - Many contents are ported from Jonathan' patch on qemu virt design - Less experience and not particularly confident in sbsa-ref address space design so this might be stupidly broken in a way I've not considered. Currently the base CXL support for arm platforms is only on Jonathan's patches[1] which have not yet merged into upstream. SBSA-REF can be more like a real machine, thus the support of cxl could be meaningful. This series leverages Jonathan's patches[1] to design [SBSA_CXL_HOST] and [SBSA_CXL_FIXED_WINDOW] spaces for sbsa-ref layout. For [SBSA_CXL_HOST], since this creates a default pxb-cxl (bus_nr=0xc0) bridge with two cxl root ports on sbsa-ref, the new memory layout places 64K space for one hard coded cxl host bridge register regions in the sbsa-ref memmap. According to above design, for now only two cxl type3 devices could be added on the cxl host. With the 'create_pxb_cxl', users don't need to input '-device pxb-cxl' and '-device cxl-rp' parameters. In addition, this support indepentent mmio32(32M) & mmio64(1M) space which are enough for cxl components, because in this way the previous pcie mmio32/64 space would not be divided and affected. However, with the pxb-cxl-host, any cxl root ports and cxl endpoint devices would occupy the BDF number of the original pcie domain. Hence, the max available pcie devices on sbsa-ref would decrease, which seems to bring a series of trouble. I'm looking for some comments on the problems and suggestions on if there are better ways to do it. For [SBSA_CXL_FIXED_WINDOW], in order to provide CFMWs on sbsa-ref, this extends 1TB space from the hole above RAM Memory [SBSA_MEM] for CXL Fixed Memory Window. 0xA0000000000 is chosen as the base address of this space because of 3 reasons: 1) It is more suitable to choose a static address instead of that implementation in virt, since a dynamic address space layout of sbsa-ref is not appropriate for its original purpose as a reference platform. 2) The Hotplug Memory address range should in the range of maximum addressable range of sbsa-ref platform(0x10000000000-0x80ffffffffff). It is satisfied the requirements of memory hotplug in linux kernel. 3) The start pfn of CFMW should exceed the reserved_pfn_range for onlined numa node. Based on 'cxl_fmws_link_targets', this adds a new function 'sbsa_cxl_fmws_link_targets' for binding cfmws.target with the default pxb-cxl-bus on sbsa-ref. In addition, this also adds 'create_cxl_fixed_window_region' to support creating a static cfmw region on sbsa-ref, so users don't need to input '-M cxl-fmw' parameter. Thus, to run sbsa-ref with a cxl device could use: qemu-system-aarch64 \ -object memory-backend-file,id=mem2,mem-path=/tmp/mem2,size=256M,share=true \ -device cxl-type3,bus=cxl.0,volatile-memdev=mem2,id=cxl-mem1 \ By the way, since the matched firmware correspond to this patch would allocate pcie bus 0xc0 ~ 0xff to pxb-cxl-host, we should add "bus=pcie.0" when we want to plug some devices on the original pcie bus, for example: -device qemu-xhci,bus=pcie.0 \ or -device nvme,serial=deadbeef,bus=pcie.0,drive=hdd \ -drive file=../disk/hdd.qcow2,format=qcow2,id=hdd,if=none \ This series patches are here to hopefully some comments to guide me! Link: [1]: https://lore.kernel.org/linux-cxl/20220616141950.23374-1-Jonathan.Cameron@huawei.com/ [2]: https://edk2.groups.io/g/devel/topic/rfc_edk2_patch_v3_0_1/109403423# [3]: https://edk2.groups.io/g/devel/topic/rfc_patch_edk2_platforms_v2/109403456 Yuquan Wang (1): hw/arm/sbsa-ref: Support CXL Host Bridge & CFMW docs/system/arm/sbsa.rst | 4 ++ hw/arm/sbsa-ref.c | 122 +++++++++++++++++++++++++++++++++++++- hw/cxl/cxl-host-stubs.c | 2 + hw/cxl/cxl-host.c | 2 +- include/hw/cxl/cxl_host.h | 2 + 5 files changed, 130 insertions(+), 2 deletions(-)