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Fri, 2 Dec 2022 02:05:48 -0600 Date: Fri, 2 Dec 2022 09:05:27 +0100 From: Robert Richter To: Dan Williams CC: , Alison Schofield , , , , Subject: Re: [PATCH v6 11/12] tools/testing/cxl: Add an RCH topology Message-ID: References: <166993040066.1882361.5484659873467120859.stgit@dwillia2-xfh.jf.intel.com> <166993046170.1882361.12460762475782283638.stgit@dwillia2-xfh.jf.intel.com> Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <166993046170.1882361.12460762475782283638.stgit@dwillia2-xfh.jf.intel.com> X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN8NAM11FT037:EE_|IA0PR12MB8206:EE_ X-MS-Office365-Filtering-Correlation-Id: 1090ded3-633b-4d32-fa81-08dad43c06c9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Dec 2022 08:05:50.2904 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1090ded3-633b-4d32-fa81-08dad43c06c9 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT037.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB8206 On 01.12.22 13:34:21, Dan Williams wrote: > In an RCH topology a CXL host-bridge as Root Complex Integrated Endpoint > the represents the memory expander. Unlike a VH topology there is no > CXL/PCIE Root Port that host the endpoint. The CXL subsystem maps this > as the CXL root object (ACPI0017 on ACPI based systems) targeting the > host-bridge as a dport, per usual, but then that dport directly hosts > the endpoint port. > > Mock up that configuration with a 4th host-bridge that has a 'cxl_rcd' > device instance as its immediate child. > > Reviewed-by: Alison Schofield Reviewed-by: Robert Richter > Signed-off-by: Dan Williams > --- > tools/testing/cxl/test/cxl.c | 151 +++++++++++++++++++++++++++++++++++++++--- > tools/testing/cxl/test/mem.c | 37 ++++++++++ > 2 files changed, 176 insertions(+), 12 deletions(-)