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From: Kuppuswamy Sathyanarayanan  <sathyanarayanan.kuppuswamy@linux.intel.com>
To: bhelgaas@google.com
Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
	ashok.raj@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com,
	knsathya@kernel.org
Subject: [PATCH v7 1/2] PCI/ERR: Call pci_bus_reset() before calling ->slot_reset() callback
Date: Mon, 26 Oct 2020 12:36:13 -0700
Message-ID: <546d346644654915877365b19ea534378db0894d.1602788209.git.sathyanarayanan.kuppuswamy@linux.intel.com> (raw)
Message-ID: <20201026193613.URPQJgfXIAY63qltdo7scnYoiDeXW8cknhQ2BQie704@z> (raw)

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.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
Reviewed-by: Ashok Raj <ashok.raj@intel.com>
---
 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);
-- 
2.17.1


             reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-15 19:02 Kuppuswamy Sathyanarayanan [this message]
2020-10-15 19:02 ` [PATCH v7 2/2] PCI/ERR: Split the fatal and non-fatal error recovery handling Kuppuswamy Sathyanarayanan
2020-10-26 19:36   ` Kuppuswamy Sathyanarayanan
2020-10-26 19:36 ` [PATCH v7 1/2] PCI/ERR: Call pci_bus_reset() before calling ->slot_reset() callback Kuppuswamy Sathyanarayanan
2020-11-24 18:45 Guilherme G. Piccoli
2020-11-24 20:43 ` Kuppuswamy, Sathyanarayanan
2020-11-27  1:47 ` Ethan Zhao

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