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Mon, 14 Jul 2025 20:49:29 +0000 From: Date: Mon, 14 Jul 2025 13:49:27 -0700 To: Jonathan Cameron , Dan Williams CC: , , , , , , , , , Message-ID: <68756d5754f81_2ead1000@dwillia2-xfh.jf.intel.com.notmuch> In-Reply-To: <20250617152157.000048a2@huawei.com> References: <20250516054732.2055093-1-dan.j.williams@intel.com> <20250516054732.2055093-11-dan.j.williams@intel.com> <20250617152157.000048a2@huawei.com> Subject: Re: [PATCH v3 10/13] PCI/TSM: Report active IDE streams Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BY1P220CA0007.NAMP220.PROD.OUTLOOK.COM (2603:10b6:a03:59d::13) To PH8PR11MB8107.namprd11.prod.outlook.com (2603:10b6:510:256::6) Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH8PR11MB8107:EE_|IA1PR11MB7856:EE_ X-MS-Office365-Filtering-Correlation-Id: 00aa3aaa-dd36-4f8d-ec33-08ddc317ed99 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|1800799024|366016; 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Establish a symlink from the > > class device to the PCI endpoint device consuming the stream, named by > > the Stream ID. > > > > Signed-off-by: Dan Williams > > --- > > Documentation/ABI/testing/sysfs-class-tsm | 10 ++++++++++ > > drivers/virt/coco/host/tsm-core.c | 17 +++++++++++++++++ > > include/linux/tsm.h | 4 ++++ > > 3 files changed, 31 insertions(+) > > > > diff --git a/Documentation/ABI/testing/sysfs-class-tsm b/Documentation/ABI/testing/sysfs-class-tsm > > index 7503f04a9eb9..75ee2b9bc555 100644 > > --- a/Documentation/ABI/testing/sysfs-class-tsm > > +++ b/Documentation/ABI/testing/sysfs-class-tsm > > @@ -8,3 +8,13 @@ Description: > > signals when the PCI layer is able to support establishment of > > link encryption and other device-security features coordinated > > through the platform tsm. > > + > > +What: /sys/class/tsm/tsm0/streamN:DDDD:BB:DD:F > > +Date: December, 2024 > > +Contact: linux-pci@vger.kernel.org > > +Description: > > + (RO) When a host bridge has established a secure connection via > > + the platform TSM, symlink appears. The primary function of this > > + is have a system global review of TSM resource consumption > > + across host bridges. The link points to the endpoint PCI device > > + at domain:DDDD bus:BB device:DD function:F. > > Do we need the name to link to include the sbdf? Maybe just streamN > is enough. It's a little fiddly to get the spdf from where that goes, but not > that challenging. > > For user ls -lf /sys/class/tsm/tsm0/* should work for instance. I had the target PCI device name in the link name before the rewrite to name the stream with the tuple of {host_bridge_stream_id, root_port_stream_id, endpoint_stream_id}. With that in place the stream name is disambiguated and the PCI device name can be dropped. > I don't care strongly about this. Maybe one for Bjorn. The shorter name is less complicated.