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Message-ID: <20140918223831.10373.21683.stgit@ahduyck-bv4.jf.intel.com>
Date: Thu, 18 Sep 2014 18:38:38 -0400
From: Alexander Duyck <alexander.h.duyck@...el.com>
To: davem@...emloft.net
Cc: nhorman@...hat.com, netdev@...r.kernel.org,
john.fastabend@...il.com, matthew.vick@...el.com,
jeffrey.t.kirsher@...el.com, sassmann@...hat.com
Subject: [net-next PATCH 18/29] fm10k: Add support for PCI power management
and error handling
Add PCI power management and error handling to allow the device to support
suspend/resume and recovery of any PCIe errors. The fm10k devices do not
support wake on LAN, and there is no plan to add this as a feature.
Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
---
drivers/net/ethernet/intel/fm10k/fm10k_pci.c | 221 ++++++++++++++++++++++++++
1 file changed, 221 insertions(+)
diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
index 4e21ddd..9b97da7 100644
--- a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
@@ -19,6 +19,7 @@
*/
#include <linux/module.h>
+#include <linux/aer.h>
#include "fm10k.h"
@@ -1534,6 +1535,8 @@ static int fm10k_probe(struct pci_dev *pdev,
goto err_pci_reg;
}
+ pci_enable_pcie_error_reporting(pdev);
+
pci_set_master(pdev);
pci_save_state(pdev);
@@ -1660,14 +1663,232 @@ static void fm10k_remove(struct pci_dev *pdev)
pci_release_selected_regions(pdev,
pci_select_bars(pdev, IORESOURCE_MEM));
+ pci_disable_pcie_error_reporting(pdev);
+
pci_disable_device(pdev);
}
+#ifdef CONFIG_PM
+/**
+ * fm10k_resume - Restore device to pre-sleep state
+ * @pdev: PCI device information struct
+ *
+ * fm10k_resume is called after the system has powered back up from a sleep
+ * state and is ready to resume operation. This function is meant to restore
+ * the device back to its pre-sleep state.
+ **/
+static int fm10k_resume(struct pci_dev *pdev)
+{
+ struct fm10k_intfc *interface = pci_get_drvdata(pdev);
+ struct net_device *netdev = interface->netdev;
+ struct fm10k_hw *hw = &interface->hw;
+ u32 err;
+
+ pci_set_power_state(pdev, PCI_D0);
+ pci_restore_state(pdev);
+
+ /* pci_restore_state clears dev->state_saved so call
+ * pci_save_state to restore it.
+ */
+ pci_save_state(pdev);
+
+ err = pci_enable_device_mem(pdev);
+ if (err) {
+ dev_err(&pdev->dev, "Cannot enable PCI device from suspend\n");
+ return err;
+ }
+ pci_set_master(pdev);
+
+ pci_wake_from_d3(pdev, false);
+
+ /* refresh hw_addr in case it was dropped */
+ hw->hw_addr = interface->uc_addr;
+
+ /* reset hardware to known state */
+ err = hw->mac.ops.init_hw(&interface->hw);
+ if (err)
+ return err;
+
+ /* reset statistics starting values */
+ hw->mac.ops.rebind_hw_stats(hw, &interface->stats);
+
+ rtnl_lock();
+
+ err = fm10k_init_queueing_scheme(interface);
+ if (!err) {
+ fm10k_mbx_request_irq(interface);
+ if (netif_running(netdev))
+ err = fm10k_open(netdev);
+ }
+
+ rtnl_unlock();
+
+ if (err)
+ return err;
+
+ netif_device_attach(netdev);
+
+ return 0;
+}
+
+/**
+ * fm10k_suspend - Prepare the device for a system sleep state
+ * @pdev: PCI device information struct
+ *
+ * fm10k_suspend is meant to shutdown the device prior to the system entering
+ * a sleep state. The fm10k hardware does not support wake on lan so the
+ * driver simply needs to shut down the device so it is in a low power state.
+ **/
+static int fm10k_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+ struct fm10k_intfc *interface = pci_get_drvdata(pdev);
+ struct net_device *netdev = interface->netdev;
+ int err = 0;
+
+ netif_device_detach(netdev);
+
+ rtnl_lock();
+
+ if (netif_running(netdev))
+ fm10k_close(netdev);
+
+ fm10k_mbx_free_irq(interface);
+
+ fm10k_clear_queueing_scheme(interface);
+
+ rtnl_unlock();
+
+ err = pci_save_state(pdev);
+ if (err)
+ return err;
+
+ pci_disable_device(pdev);
+ pci_wake_from_d3(pdev, false);
+ pci_set_power_state(pdev, PCI_D3hot);
+
+ return 0;
+}
+
+#endif /* CONFIG_PM */
+/**
+ * fm10k_io_error_detected - called when PCI error is detected
+ * @pdev: Pointer to PCI device
+ * @state: The current pci connection state
+ *
+ * This function is called after a PCI bus error affecting
+ * this device has been detected.
+ */
+static pci_ers_result_t fm10k_io_error_detected(struct pci_dev *pdev,
+ pci_channel_state_t state)
+{
+ struct fm10k_intfc *interface = pci_get_drvdata(pdev);
+ struct net_device *netdev = interface->netdev;
+
+ netif_device_detach(netdev);
+
+ if (state == pci_channel_io_perm_failure)
+ return PCI_ERS_RESULT_DISCONNECT;
+
+ if (netif_running(netdev))
+ fm10k_close(netdev);
+
+ fm10k_mbx_free_irq(interface);
+
+ pci_disable_device(pdev);
+
+ /* Request a slot reset. */
+ return PCI_ERS_RESULT_NEED_RESET;
+}
+
+/**
+ * fm10k_io_slot_reset - called after the pci bus has been reset.
+ * @pdev: Pointer to PCI device
+ *
+ * Restart the card from scratch, as if from a cold-boot.
+ */
+static pci_ers_result_t fm10k_io_slot_reset(struct pci_dev *pdev)
+{
+ struct fm10k_intfc *interface = pci_get_drvdata(pdev);
+ pci_ers_result_t result;
+
+ if (pci_enable_device_mem(pdev)) {
+ dev_err(&pdev->dev,
+ "Cannot re-enable PCI device after reset.\n");
+ result = PCI_ERS_RESULT_DISCONNECT;
+ } else {
+ pci_set_master(pdev);
+ pci_restore_state(pdev);
+
+ /* After second error pci->state_saved is false, this
+ * resets it so EEH doesn't break.
+ */
+ pci_save_state(pdev);
+
+ pci_wake_from_d3(pdev, false);
+
+ /* refresh hw_addr in case it was dropped */
+ interface->hw.hw_addr = interface->uc_addr;
+
+ interface->flags |= FM10K_FLAG_RESET_REQUESTED;
+ fm10k_service_event_schedule(interface);
+
+ result = PCI_ERS_RESULT_RECOVERED;
+ }
+
+ pci_cleanup_aer_uncorrect_error_status(pdev);
+
+ return result;
+}
+
+/**
+ * fm10k_io_resume - called when traffic can start flowing again.
+ * @pdev: Pointer to PCI device
+ *
+ * This callback is called when the error recovery driver tells us that
+ * its OK to resume normal operation.
+ */
+static void fm10k_io_resume(struct pci_dev *pdev)
+{
+ struct fm10k_intfc *interface = pci_get_drvdata(pdev);
+ struct net_device *netdev = interface->netdev;
+ struct fm10k_hw *hw = &interface->hw;
+ int err = 0;
+
+ /* reset hardware to known state */
+ hw->mac.ops.init_hw(&interface->hw);
+
+ /* reset statistics starting values */
+ hw->mac.ops.rebind_hw_stats(hw, &interface->stats);
+
+ /* reassociate interrupts */
+ fm10k_mbx_request_irq(interface);
+
+ if (netif_running(netdev))
+ err = fm10k_open(netdev);
+
+ /* final check of hardware state before registering the interface */
+ err = err ? : fm10k_hw_ready(interface);
+
+ if (!err)
+ netif_device_attach(netdev);
+}
+
+static const struct pci_error_handlers fm10k_err_handler = {
+ .error_detected = fm10k_io_error_detected,
+ .slot_reset = fm10k_io_slot_reset,
+ .resume = fm10k_io_resume,
+};
+
static struct pci_driver fm10k_driver = {
.name = fm10k_driver_name,
.id_table = fm10k_pci_tbl,
.probe = fm10k_probe,
.remove = fm10k_remove,
+#ifdef CONFIG_PM
+ .suspend = fm10k_suspend,
+ .resume = fm10k_resume,
+#endif
+ .err_handler = &fm10k_err_handler
};
/**
--
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