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From: Lukas Wunner <lukas@wunner.de>
To: Terry Bowman <terry.bowman@amd.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
	Dan Williams <djbw@kernel.org>, Dave Jiang <dave.jiang@intel.com>,
	Ira Weiny <iweiny@kernel.org>,
	Jonathan Cameron <jic23@kernel.org>, Len Brown <lenb@kernel.org>,
	"Rafael J . Wysocki" <rafael@kernel.org>,
	Robert Richter <rrichter@amd.com>,
	linux-acpi@vger.kernel.org, linux-cxl@vger.kernel.org,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-pci@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	Alejandro Lucero <alucerop@amd.com>,
	Alison Schofield <alison.schofield@intel.com>,
	Ankit Agrawal <ankita@nvidia.com>,
	Ard Biesheuvel <ardb@kernel.org>,
	Ben Cheatham <Benjamin.Cheatham@amd.com>,
	Borislav Petkov <bp@alien8.de>, Breno Leitao <leitao@debian.org>,
	Davidlohr Bueso <dave@stgolabs.net>,
	"Fabio M . De Francesco" <fabio.m.de.francesco@linux.intel.com>,
	Gregory Price <gourry@gourry.net>,
	Hanjun Guo <guohanjun@huawei.com>,
	Jonathan Corbet <corbet@lwn.net>, Kees Cook <kees@kernel.org>,
	Kuppuswamy Sathyanarayanan
	<sathyanarayanan.kuppuswamy@linux.intel.com>,
	Li Ming <ming.li@zohomail.com>,
	Mahesh J Salgaonkar <mahesh@linux.ibm.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Oliver O'Halloran <oohall@gmail.com>,
	Shiju Jose <shiju.jose@huawei.com>,
	Shuah Khan <skhan@linuxfoundation.org>,
	Shuai Xue <xueshuai@linux.alibaba.com>,
	Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>,
	Tony Luck <tony.luck@intel.com>,
	Vishal Verma <vishal.l.verma@intel.com>
Subject: Re: [PATCH v18 11/13] PCI: Cache PCI DSN into pci_dev->dsn during probe
Date: Sat, 18 Jul 2026 09:02:15 +0200	[thread overview]
Message-ID: <alsk97jVqw9jbRdQ@wunner.de> (raw)
In-Reply-To: <20260717222706.3540281-12-terry.bowman@amd.com>

On Fri, Jul 17, 2026 at 05:27:04PM -0500, Terry Bowman wrote:
> Add a u64 dsn field to struct pci_dev and populate it from pci_get_dsn()
> during pci_init_capabilities() at probe time via pci_dsn_init(). Only
> write dev->dsn when the read succeeds. The zero initial value from
> pci_dev allocation already represents 'no DSN available.'

The DSN is already cached on (natively handled) PCIe hotplug ports
to detect device replacement during system sleep, see struct controller
in drivers/pci/hotplug/pciehp.h.

Please remove that member from struct controller, remove the two
assignments to the member in pciehp_configure_device() and pcie_init()
and change the comparison in pciehp_device_replaced() to use the new
member in struct pci_dev.  You can do this either as part of this patch
or in a separate patch.

Thanks,

Lukas

  parent reply	other threads:[~2026-07-18  7:02 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-07-17 22:26 [PATCH v18 00/13] Enable CXL PCIe Port Protocol Error handling and logging Terry Bowman
2026-07-17 22:26 ` [PATCH v18 01/13] cxl/ras: Fix cxl_rch_get_aer_severity() wrong severity register Terry Bowman
2026-07-17 22:43   ` sashiko-bot
2026-07-17 22:26 ` [PATCH v18 02/13] acpi/apei/ghes: Use raw_spinlock_t for CXL CPER work locks Terry Bowman
2026-07-17 22:49   ` sashiko-bot
2026-07-17 22:26 ` [PATCH v18 03/13] cxl: Tighten CPER kfifo registration API and symbol visibility Terry Bowman
2026-07-17 22:37   ` sashiko-bot
2026-07-17 22:26 ` [PATCH v18 04/13] cxl: Rename find_cxl_port() to find_cxl_port_by_dport() Terry Bowman
2026-07-17 22:34   ` sashiko-bot
2026-07-17 22:26 ` [PATCH v18 05/13] PCI/AER: Introduce AER-CXL protocol error kfifo Terry Bowman
2026-07-17 22:35   ` sashiko-bot
2026-07-17 22:26 ` [PATCH v18 06/13] PCI: Establish common CXL Port protocol error flow Terry Bowman
2026-07-17 22:43   ` sashiko-bot
2026-07-17 22:27 ` [PATCH v18 07/13] PCI/CXL: Add RCH support to CXL handlers Terry Bowman
2026-07-17 22:43   ` sashiko-bot
2026-07-17 22:27 ` [PATCH v18 08/13] cxl/pci: Thread port and dport through RAS handling helpers Terry Bowman
2026-07-17 22:40   ` sashiko-bot
2026-07-17 22:27 ` [PATCH v18 09/13] cxl: Update CXL Endpoint AER handler Terry Bowman
2026-07-17 22:53   ` sashiko-bot
2026-07-17 22:27 ` [PATCH v18 10/13] cxl: Add port and dport identifiers to CXL AER trace events Terry Bowman
2026-07-17 22:53   ` sashiko-bot
2026-07-17 22:27 ` [PATCH v18 11/13] PCI: Cache PCI DSN into pci_dev->dsn during probe Terry Bowman
2026-07-17 22:44   ` sashiko-bot
2026-07-18  7:02   ` Lukas Wunner [this message]
2026-07-17 22:27 ` [PATCH v18 12/13] PCI/CXL: Mask/Unmask CXL protocol errors Terry Bowman
2026-07-17 22:58   ` sashiko-bot
2026-07-17 22:27 ` [PATCH v18 13/13] Documentation: cxl: Document CXL protocol error handling Terry Bowman
2026-07-17 22:43   ` sashiko-bot

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