Re: [PATCH v8 1/2] PCI/ERR: Call pci_bus_reset() before calling ->slot_reset() callback

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On 10/26/20 12:37 PM, Kuppuswamy Sathyanarayanan wrote:
Currently if report_error_detected() or report_mmio_enabled()
functions requests PCI_ERS_RESULT_NEED_RESET, current
pcie_do_recovery() implementation does not do the requested
explicit device reset, but instead just calls the
report_slot_reset() on all affected devices. Notifying about the
reset via report_slot_reset() without doing the actual device
reset is incorrect. So call pci_bus_reset() before triggering
->slot_reset() callback.
Gentle ping! Any comments on this patch set?

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
Reviewed-by: Sinan Kaya <okaya@xxxxxxxxxx>
Reviewed-by: Ashok Raj <ashok.raj@xxxxxxxxx>
---
  Changes since v7:
   * Rebased on top of v5.10-rc1.

  Changes since v6:
   * None.

  Changes since v5:
   * Added Ashok's Reviewed-by tag.

  Changes since v4:
   * Added check for pci_reset_bus() return value.

  drivers/pci/pcie/err.c | 12 +++++++-----
  1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
index c543f419d8f9..315a4d559c4c 100644
--- a/drivers/pci/pcie/err.c
+++ b/drivers/pci/pcie/err.c
@@ -152,6 +152,7 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
  {
  	pci_ers_result_t status = PCI_ERS_RESULT_CAN_RECOVER;
  	struct pci_bus *bus;
+	int ret;
/*
  	 * Error recovery runs on all subordinates of the first downstream port.
@@ -181,11 +182,12 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
  	}
if (status == PCI_ERS_RESULT_NEED_RESET) {
-		/*
-		 * TODO: Should call platform-specific
-		 * functions to reset slot before calling
-		 * drivers' slot_reset callbacks?
-		 */
+		ret = pci_reset_bus(dev);
+		if (ret < 0) {
+			pci_err(dev, "Failed to reset %d\n", ret);
+			status = PCI_ERS_RESULT_DISCONNECT;
+			goto failed;
+		}
  		status = PCI_ERS_RESULT_RECOVERED;
  		pci_dbg(dev, "broadcast slot_reset message\n");
  		pci_walk_bus(bus, report_slot_reset, &status);


--
Sathyanarayanan Kuppuswamy
Linux Kernel Developer



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