From: Srirangan Madhavan <smadhavan@nvidia.com>
To: Alison Schofield <alison.schofield@intel.com>,
Bjorn Helgaas <bhelgaas@google.com>,
Dave Jiang <dave.jiang@intel.com>,
Davidlohr Bueso <dave@stgolabs.net>,
Ira Weiny <ira.weiny@intel.com>,
Jonathan Cameron <jic23@kernel.org>,
Vishal Verma <vishal.l.verma@intel.com>,
linux-cxl@vger.kernel.org, linux-pci@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: Alex Williamson <alex.williamson@redhat.com>,
vsethi@nvidia.com, alwilliamson@nvidia.com,
Sai Yashwanth Reddy Kancherla <skancherla@nvidia.com>,
Vishal Aslot <vaslot@nvidia.com>,
Manish Honap <mhonap@nvidia.com>, Jiandi An <jan@nvidia.com>,
Richard Cheng <icheng@nvidia.com>,
linux-tegra@vger.kernel.org,
Srirangan Madhavan <smadhavan@nvidia.com>
Subject: [PATCH v10 08/12] cxl: Reject CXL Reset on multifunction devices
Date: Tue, 4 Aug 2026 19:29:54 +0000 [thread overview]
Message-ID: <20260804192958.1823952-9-smadhavan@nvidia.com> (raw)
In-Reply-To: <20260804192958.1823952-1-smadhavan@nvidia.com>
CXL Reset can be exposed as a PCI function reset method only when the
reset is function-scoped. PCI reset-method probing runs during
enumeration, so walking sibling functions there can race with functions
that have not been added to the bus yet.
Reject multifunction devices for now instead of trying to infer reset
scope from sibling state. Systems that can prove a multifunction device
has function-scoped CXL Reset can be enabled later.
Signed-off-by: Srirangan Madhavan <smadhavan@nvidia.com>
---
drivers/cxl/core/resource.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/cxl/core/resource.c b/drivers/cxl/core/resource.c
index 6d4528f77c53..464ca9bdae05 100644
--- a/drivers/cxl/core/resource.c
+++ b/drivers/cxl/core/resource.c
@@ -979,6 +979,9 @@ int cxl_reset_function(struct pci_dev *pdev, bool probe)
if (dvsec < 0)
return dvsec;
+ if (pdev->multifunction)
+ return -ENOTTY;
+
if (probe)
return 0;
--
2.43.0
next prev parent reply other threads:[~2026-08-04 19:30 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-04 19:29 [PATCH v10 00/12] PCI/CXL: Add CXL reset support for Type 2 devices Srirangan Madhavan
2026-08-04 19:29 ` [PATCH v10 01/12] cxl: Move HDM decoder programming helpers Srirangan Madhavan
2026-08-05 2:13 ` Alison Schofield
2026-08-04 19:29 ` [PATCH v10 02/12] cxl: Pass decoder settings to HDM commit helpers Srirangan Madhavan
2026-08-04 19:29 ` [PATCH v10 03/12] cxl: Share HDM decoder decode logic Srirangan Madhavan
2026-08-04 19:29 ` [PATCH v10 04/12] cxl: Cache decoder settings on PCI devices Srirangan Madhavan
2026-08-04 19:29 ` [PATCH v10 05/12] cxl: Cache endpoint decoder settings during PCI enumeration Srirangan Madhavan
2026-08-05 2:28 ` Alison Schofield
2026-08-04 19:29 ` [PATCH v10 06/12] cxl: Add CXL Device Reset helper Srirangan Madhavan
2026-08-04 19:29 ` [PATCH v10 07/12] cxl: Validate HDM ranges before CXL reset Srirangan Madhavan
2026-08-04 19:29 ` Srirangan Madhavan [this message]
2026-08-04 19:29 ` [PATCH v10 09/12] cxl: Restore CXL HDM state after PCI reset Srirangan Madhavan
2026-08-04 19:29 ` [PATCH v10 10/12] PCI/CXL: Expose CXL Reset as a PCI reset method Srirangan Madhavan
2026-08-04 19:29 ` [PATCH v10 11/12] Documentation/ABI: Document CXL Reset " Srirangan Madhavan
2026-08-04 19:29 ` [PATCH v10 12/12] PCI/CXL: Restore HDM state after CXL bus reset Srirangan Madhavan
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