cxl_rch_get_aer_severity() classifies RCH Downstream Port uncorrectable
errors as fatal or non-fatal by ANDing uncorrectable status with
PCI_ERR_ROOT_FATAL_RCV. This is wrong because PCI_ERR_ROOT_FATAL_RCV is a
Root Error Status register bit (bit 6), not a severity bit. ANDing it
against uncorrectable status tests a reserved bit and produces incorrect
severity classification.
Fix by ANDing the unmasked uncor_status against uncor_severity. Per
PCIe Base Spec r6.0 Section 7.8.4.4, each bit in the Uncorrectable
Error Severity register indicates whether the corresponding error is
fatal (1) or non-fatal (0).
Fixes: 6ac07883dbb5 ("cxl/pci: Add RCH downstream port error logging")
Cc: [email protected]
Signed-off-by: Terry Bowman <[email protected]>
---
Changes in v17 -> v18:
- New patch.
---
drivers/cxl/core/ras_rch.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/cxl/core/ras_rch.c b/drivers/cxl/core/ras_rch.c
index 0a8b3b9b63884..44b335d560708 100644
--- a/drivers/cxl/core/ras_rch.c
+++ b/drivers/cxl/core/ras_rch.c
@@ -80,7 +80,8 @@ static bool cxl_rch_get_aer_severity(struct
aer_capability_regs *aer_regs,
int *severity)
{
if (aer_regs->uncor_status & ~aer_regs->uncor_mask) {
- if (aer_regs->uncor_status & PCI_ERR_ROOT_FATAL_RCV)
+ if ((aer_regs->uncor_status & ~aer_regs->uncor_mask) &
+ aer_regs->uncor_severity)
*severity = AER_FATAL;
else
*severity = AER_NONFATAL;
--
2.34.1
