From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B7C54199CC for ; Mon, 9 Oct 2023 15:48:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=none Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3DB4D9C for ; Mon, 9 Oct 2023 08:48:02 -0700 (PDT) Received: from lhrpeml500005.china.huawei.com (unknown [172.18.147.207]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4S43KT00znz6K6gQ; Mon, 9 Oct 2023 23:46:04 +0800 (CST) Received: from localhost (10.202.227.76) 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, 9 Oct 2023 16:47:59 +0100 Date: Mon, 9 Oct 2023 16:47:58 +0100 From: Jonathan Cameron To: Dave Jiang CC: , , , , , , , , , , , Subject: Re: [PATCH v4] hw/cxl: Add QTG _DSM support for ACPI0017 device Message-ID: <20231009164758.00001e43@Huawei.com> In-Reply-To: <169663055629.1214042.8019806314058171125.stgit@djiang5-mobl3> References: <652048e465c8d_ae7e7294e9@dwillia2-xfh.jf.intel.com.notmuch> <169663055629.1214042.8019806314058171125.stgit@djiang5-mobl3> Organization: Huawei Technologies Research and Development (UK) Ltd. X-Mailer: Claws Mail 4.1.0 (GTK 3.24.33; x86_64-w64-mingw32) Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.202.227.76] X-ClientProxiedBy: lhrpeml100002.china.huawei.com (7.191.160.241) To lhrpeml500005.china.huawei.com (7.191.163.240) X-CFilter-Loop: Reflected X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H5,RCVD_IN_MSPIKE_WL, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net On Fri, 06 Oct 2023 15:15:56 -0700 Dave Jiang wrote: > Add a simple _DSM call support for the ACPI0017 device to return fake QTG > ID values of 0 and 1 in all cases. This for _DSM plumbing testing from the OS. > > Following edited for readability > > Device (CXLM) > { > Name (_HID, "ACPI0017") // _HID: Hardware ID > ... > Method (_DSM, 4, Serialized) // _DSM: Device-Specific Method > { > If ((Arg0 == ToUUID ("f365f9a6-a7de-4071-a66a-b40c0b4f8e52"))) > { > If ((Arg2 == Zero)) > { > Return (Buffer (One) { 0x01 }) > } > > If ((Arg2 == One)) > { > Return (Package (0x02) > { > One, > Package (0x02) > { > Zero, > One > } > }) > } > } > } > > Signed-off-by: Dave Jiang > Signed-off-by: Jonathan Cameron > > -- You've picked up my bad habit / typo. Needs to be --- to stop git picking up this text... > v4: Change to package of ints rather than buffers. Also moved to 2 QTG IDs > to improve kernel side testing. Tested on x86 qemu guest against kernel > QTG ID _DSM parsing code to be upstreamed. > > v3: Fix output assignment to be BE host friendly. Fix typo in comment. > According to the CXL spec, the DSM output should be 1 WORD to indicate > the max suppoted QTG ID and a package of 0 or more WORDs for the QTG IDs. > In this dummy impementation, we have first WORD with a 1 to indcate max > supprted QTG ID of 1. And second WORD in a package to indicate the QTG > ID of 0. > > v2: Minor edit to drop reference to switches in patch description. > Message-Id: <20230904161847.18468-3-Jonathan.Cameron@huawei.com> > Reviewed-by: Michael S. Tsirkin > Signed-off-by: Michael S. Tsirkin Given it's changed in significant way should drop these. Anyhow, the tests also need updating. I can do that and push out a v5 with tests as well once I've tested. I'm assuming need tweaked kernel code to test? > --- > hw/acpi/cxl.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++ > hw/i386/acpi-build.c | 1 + > include/hw/acpi/cxl.h | 1 + > 3 files changed, 71 insertions(+) > > diff --git a/hw/acpi/cxl.c b/hw/acpi/cxl.c > index 92b46bc9323b..9cd7905ea25a 100644 > --- a/hw/acpi/cxl.c > +++ b/hw/acpi/cxl.c > @@ -30,6 +30,75 @@ > #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 _DSM Function for Retrieving QTG ID */ > + 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 }; /* function 1 only */ > + > + aml_append(ifctx2, > + aml_return(aml_buffer(sizeof(byte_list), byte_list))); > + } > + aml_append(ifctx, ifctx2); > + > + /* > + * Function 1 > + * Creating a package with static values. The max supported QTG ID will > + * be 1 and recommended QTG IDs are 0 and then 1. > + * The values here are statically created to simplify emulation. Values > + * from a real BIOS would be determined by the performance of all the > + * present CXL memory and then assigned. > + */ > + ifctx2 = aml_if(aml_equal(function, aml_int(1))); > + { > + Aml *pak, *pak1; > + > + /* > + * Return: A package containing two elements - a WORD that returns > + * the maximum throttling group that the platform supports, and a > + * package containing the QTG ID(s) that the platform recommends. > + * Package { > + * Max Supported QTG ID > + * Package {QTG Recommendations} > + * } > + * > + * While the SPEC specified WORD that hints at the value being > + * 16bit, the ACPI dump of BIOS DSDT table showed that the values > + * are integers with no specific size specification. aml_int() will > + * be used for the values. > + */ > + pak1 = aml_package(2); > + /* Set QTG ID of 0 */ > + aml_append(pak1, aml_int(0)); > + /* Set QTG ID of 1 */ > + aml_append(pak1, aml_int(1)); > + > + pak = aml_package(2); > + /* Set Max QTG 1 */ > + aml_append(pak, aml_int(1)); > + 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, PXBCXLDev *cxl) > { > PXBDev *pxb = PXB_DEV(cxl); > diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c > index 95199c89008a..692af40b1a75 100644 > --- a/hw/i386/acpi-build.c > +++ b/hw/i386/acpi-build.c > @@ -1422,6 +1422,7 @@ 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 > >