在 2025/2/12 05:23, Sathyanarayanan Kuppuswamy 写道:
On 2/7/25 1:34 AM, Shuai Xue wrote:
The current implementation of pcie_do_recovery() assumes that the
recovery process is executed on the device that detected the error.
However, the DPC driver currently passes the error port that experienced
the DPC event to pcie_do_recovery().
Use the SOURCE ID register to correctly identify the device that detected the
error. By passing this error device to pcie_do_recovery(), subsequent
patches will be able to accurately access AER status of the error device.
I also recommend adding info about the fact that pcie_do_recovery() finds
upstream bridge to run the recovery process and hence should not observe
any functional changes (compared to previous version)
Got it. Will add it.
Signed-off-by: Shuai Xue <xueshuai@xxxxxxxxxxxxxxxxx>
---
drivers/pci/pci.h | 2 +-
drivers/pci/pcie/dpc.c | 25 +++++++++++++++++++++----
drivers/pci/pcie/edr.c | 7 ++++---
3 files changed, 26 insertions(+), 8 deletions(-)
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 01e51db8d285..870d2fbd6ff2 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -572,7 +572,7 @@ struct rcec_ea {
void pci_save_dpc_state(struct pci_dev *dev);
void pci_restore_dpc_state(struct pci_dev *dev);
void pci_dpc_init(struct pci_dev *pdev);
-void dpc_process_error(struct pci_dev *pdev);
+struct pci_dev *dpc_process_error(struct pci_dev *pdev);
pci_ers_result_t dpc_reset_link(struct pci_dev *pdev);
bool pci_dpc_recovered(struct pci_dev *pdev);
unsigned int dpc_tlp_log_len(struct pci_dev *dev);
diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
index 1a54a0b657ae..a91440f3b118 100644
--- a/drivers/pci/pcie/dpc.c
+++ b/drivers/pci/pcie/dpc.c
@@ -253,10 +253,17 @@ static int dpc_get_aer_uncorrect_severity(struct pci_dev *dev,
return 1;
}
-void dpc_process_error(struct pci_dev *pdev)
+/**
+ * dpc_process_error - handle the DPC error status
+ * @pdev: the port that experienced the containment event
+ *
+ * Return the device that detected the error.
+ */
Add a note about calling pci_dev_put() after using this function.
Will add it in next version.
Thanks.
Shuai
