[PATCH] AER: PCIE CTO recovery handle fix

[孙利斌_Dio]

[EXTERNAL EMAIL]

From 5fc7b1a9e0f0bcfa14068c6358019ed1e3ffc6c6 Mon Sep 17 00:00:00 2001
From: "dio.sun" <dio.sun@xxxxxxxxxxxxxxxx>
Date: Wed, 26 Feb 2025 08:54:49 +0000
Subject: [PATCH] AER: PCIE CTO recovery handle fix

 - Non-fatal PCIe CTO is reportted to PCIE RC and it will be convertted to
   AdvNonFatalErr automatically
 - according to PCIE SPEC 6.2.3.2.4.4 Requester with Completion Timeout(
   If the severity of the CTO is non-fatal, and the Requester elects to
   attempt recovery by issuing a new request, the Requester must
   first handle the currecnt error case as an Advisory Non-Fatal Error.).
 - Current Kernel code does nothing when receiving an AdvNonFatalErr(
   Correctable Error) and the device driver has no chance to handle this
   error.
 - Under this situation, sometimes system will hang when more
   AdvNonFatalErr coming.

Signed-off-by: dio.sun <dio.sun@xxxxxxxxxxxxxxxx>
---
drivers/pci/pcie/aer.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index 508474e17183..5ddc990c6f42 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -1154,7 +1154,21 @@ static void aer_recover_work_func(struct work_struct *work)
                ghes_estatus_pool_region_free((unsigned long)entry.regs,
                                            sizeof(struct aer_capability_regs));

-               if (entry.severity == AER_NONFATAL)
+               if (entry.severity == AER_CORRECTABLE) {
+                       if (entry.regs->cor_status & PCI_ERR_COR_ADV_NFAT) {
+                               pci_err(pdev, "%04x:%02x:%02x:%x advisory non-fatal error\n",
+                                               entry.domain, entry.bus, PCI_SLOT(entry.devfn),
+                                               PCI_FUNC(entry.devfn));
+                               if (entry.regs->uncor_status & PCI_ERR_UNC_COMP_TIME) {
+                                       pci_err(pdev, "%04x:%02x:%02x:%x completion timeout\n",
+                                                       entry.domain, entry.bus,
+                                                       PCI_SLOT(entry.devfn),
+                                                       PCI_FUNC(entry.devfn));
+                                       pcie_do_recovery(pdev, pci_channel_io_frozen,
+                                                                        aer_root_reset);
+                               }
+                       }
+               } else if (entry.severity == AER_NONFATAL)
                        pcie_do_recovery(pdev, pci_channel_io_normal,
                                         aer_root_reset);
                else if (entry.severity == AER_FATAL)
--
2.37.3

Attachment: 0001-AER-PCIE-CTO-recovery-handle-fix.patch
Description: 0001-AER-PCIE-CTO-recovery-handle-fix.patch