From mboxrd@z Thu Jan 1 00:00:00 1970 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 D73EFC61DA3 for ; Thu, 26 Jan 2023 18:25:13 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pL6vg-0004Xe-1G; Thu, 26 Jan 2023 13:24:56 -0500 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 1pL6ve-0004XV-Mt for qemu-devel@nongnu.org; Thu, 26 Jan 2023 13:24:54 -0500 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 1pL6vc-0001yG-F3 for qemu-devel@nongnu.org; Thu, 26 Jan 2023 13:24:54 -0500 Received: from lhrpeml500005.china.huawei.com (unknown [172.18.147.206]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4P2pt06Qm9z67J5b; Fri, 27 Jan 2023 02:20:40 +0800 (CST) Received: from localhost (10.81.202.191) 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 15.1.2375.34; Thu, 26 Jan 2023 18:24:47 +0000 Date: Thu, 26 Jan 2023 18:24:46 +0000 To: Dave Jiang CC: , , , , Subject: Re: [PATCH] hw/cxl: Add QTG _DSM support for ACPI0017 device Message-ID: <20230126182446.00001ce7@Huawei.com> In-Reply-To: <167475645654.1386523.7101990863993668595.stgit@djiang5-mobl3.local> References: <167475645654.1386523.7101990863993668595.stgit@djiang5-mobl3.local> Organization: Huawei Technologies Research and Development (UK) Ltd. X-Mailer: Claws Mail 4.1.0 (GTK 3.24.33; x86_64-w64-mingw32) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.81.202.191] X-ClientProxiedBy: lhrpeml500006.china.huawei.com (7.191.161.198) 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_H2=-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 From: Jonathan Cameron via Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Thu, 26 Jan 2023 11:07:37 -0700 Dave Jiang wrote: Hi Dave, That was quick! > Add a simple _DSM call support for the ACPI0017 device to return a fake QTG > ID value. Given the current CXL implementation does not involve switches, I don't follow. What part doesn't involve switches? > a faked value of 0 can be returned for the QTG ID. The enabling is for _DSM > plumbing testing from the OS. Can you include a dump iasl -d for the DSDT chunk this generates. Much easier to review with that available. On that note, tests need updating I think tests/qtest/bios-tables-test.c data which is in tests/data/acpi/q35/DSDT.cxl We should update that test code as part of the volatile series as well as it's using the deprecated memdev parameter - not critical but never a good thing to leave old examples of what not to use in the tests. Thanks, Jonathan p.s. I'm too lazy to look at the code without the AML to compare with as I'll review the AML first then look at if there are any oddities in the generation code. > > Signed-off-by: Dave Jiang > --- > hw/acpi/cxl.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++ > hw/i386/acpi-build.c | 1 + > include/hw/acpi/cxl.h | 1 + > 3 files changed, 59 insertions(+) > > diff --git a/hw/acpi/cxl.c b/hw/acpi/cxl.c > index 2bf8c0799359..cd6839c24416 100644 > --- a/hw/acpi/cxl.c > +++ b/hw/acpi/cxl.c > @@ -30,6 +30,63 @@ > #include "qapi/error.h" > #include "qemu/uuid.h" > > +void build_cxl_dsm_method(Aml *dev) > +{ > + Aml *method, *ifctx, *ifctx2; > + > + method = aml_method("_DSM", 4, AML_SERIALIZED); > + { > + Aml *function, *uuid; > + > + uuid = aml_arg(0); > + function = aml_arg(2); > + /* CXL spec v3.0 9.17.3.1 *, QTG ID _DSM */ > + ifctx = aml_if(aml_equal( > + uuid, aml_touuid("F365F9A6-A7DE-4071-A66A-B40C0B4F8E52"))); > + > + /* Function 0, standard DSM query function */ > + ifctx2 = aml_if(aml_equal(function, aml_int(0))); > + { > + uint8_t byte_list[1] = { 0x01 }; /* functions 1 only */ > + > + aml_append(ifctx2, > + aml_return(aml_buffer(sizeof(byte_list), byte_list))); > + } > + aml_append(ifctx, ifctx2); > + > + /* > + * Function 1 > + * A return value of {1, {0}} inciate that > + * max supported QTG ID of 1 and recommended QTG is 0. > + * The values here are faked to simplify emulation. > + */ > + ifctx2 = aml_if(aml_equal(function, aml_int(1))); > + { > + uint16_t word_list[1] = { 0x01 }; > + uint16_t word_list2[1] = { 0 }; > + uint8_t *byte_list = (uint8_t *)word_list; > + uint8_t *byte_list2 = (uint8_t *)word_list2; > + Aml *pak, *pak1; > + > + /* > + * The return package is a package of a WORD and another package. > + * The embedded package contains 0 or more WORDs for the > + * recommended QTG IDs. > + */ > + pak1 = aml_package(1); > + aml_append(pak1, aml_buffer(sizeof(uint16_t), byte_list2)); > + pak = aml_package(2); > + aml_append(pak, aml_buffer(sizeof(uint16_t), byte_list)); > + aml_append(pak, pak1); > + > + aml_append(ifctx2, aml_return(pak)); > + } > + aml_append(ifctx, ifctx2); > + } > + aml_append(method, ifctx); > + aml_append(dev, method); > +} > + > static void cedt_build_chbs(GArray *table_data, PXBDev *cxl) > { > SysBusDevice *sbd = SYS_BUS_DEVICE(cxl->cxl.cxl_host_bridge); > diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c > index 285829802b1a..623f26a16db3 100644 > --- a/hw/i386/acpi-build.c > +++ b/hw/i386/acpi-build.c > @@ -1313,6 +1313,7 @@ static void build_acpi0017(Aml *table) > method = aml_method("_STA", 0, AML_NOTSERIALIZED); > aml_append(method, aml_return(aml_int(0x01))); > aml_append(dev, method); > + build_cxl_dsm_method(dev); > > aml_append(scope, dev); > aml_append(table, scope); > diff --git a/include/hw/acpi/cxl.h b/include/hw/acpi/cxl.h > index acf441888683..8f22c71530d8 100644 > --- a/include/hw/acpi/cxl.h > +++ b/include/hw/acpi/cxl.h > @@ -25,5 +25,6 @@ void cxl_build_cedt(GArray *table_offsets, GArray *table_data, > BIOSLinker *linker, const char *oem_id, > const char *oem_table_id, CXLState *cxl_state); > void build_cxl_osc_method(Aml *dev); > +void build_cxl_dsm_method(Aml *dev); > > #endif > >