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![Uwe Kleine-König](/assets/img/avatar_default.png)
Struct pci_driver contains a struct device_driver, so for PCI devices, it's easy to convert a device_driver * to a pci_driver * with to_pci_driver(). The device_driver * is in struct device, so we don't need to also keep track of the pci_driver * in struct pci_dev. Replace pdev->driver with to_pci_driver(). This is a step toward removing pci_dev->driver. [bhelgaas: split to separate patch] Link: https://lore.kernel.org/r/20211004125935.2300113-11-u.kleine-koenig@pengutronix.de Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
1225 lines
32 KiB
C
1225 lines
32 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* PCI Error Recovery Driver for RPA-compliant PPC64 platform.
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* Copyright IBM Corp. 2004 2005
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* Copyright Linas Vepstas <linas@linas.org> 2004, 2005
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*
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* Send comments and feedback to Linas Vepstas <linas@austin.ibm.com>
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*/
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/pci_hotplug.h>
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#include <asm/eeh.h>
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#include <asm/eeh_event.h>
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#include <asm/ppc-pci.h>
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#include <asm/pci-bridge.h>
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#include <asm/prom.h>
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#include <asm/rtas.h>
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struct eeh_rmv_data {
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struct list_head removed_vf_list;
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int removed_dev_count;
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};
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static int eeh_result_priority(enum pci_ers_result result)
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{
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switch (result) {
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case PCI_ERS_RESULT_NONE:
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return 1;
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case PCI_ERS_RESULT_NO_AER_DRIVER:
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return 2;
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case PCI_ERS_RESULT_RECOVERED:
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return 3;
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case PCI_ERS_RESULT_CAN_RECOVER:
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return 4;
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case PCI_ERS_RESULT_DISCONNECT:
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return 5;
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case PCI_ERS_RESULT_NEED_RESET:
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return 6;
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default:
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WARN_ONCE(1, "Unknown pci_ers_result value: %d\n", (int)result);
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return 0;
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}
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};
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static const char *pci_ers_result_name(enum pci_ers_result result)
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{
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switch (result) {
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case PCI_ERS_RESULT_NONE:
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return "none";
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case PCI_ERS_RESULT_CAN_RECOVER:
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return "can recover";
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case PCI_ERS_RESULT_NEED_RESET:
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return "need reset";
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case PCI_ERS_RESULT_DISCONNECT:
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return "disconnect";
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case PCI_ERS_RESULT_RECOVERED:
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return "recovered";
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case PCI_ERS_RESULT_NO_AER_DRIVER:
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return "no AER driver";
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default:
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WARN_ONCE(1, "Unknown result type: %d\n", (int)result);
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return "unknown";
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}
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};
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static enum pci_ers_result pci_ers_merge_result(enum pci_ers_result old,
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enum pci_ers_result new)
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{
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if (eeh_result_priority(new) > eeh_result_priority(old))
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return new;
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return old;
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}
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static bool eeh_dev_removed(struct eeh_dev *edev)
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{
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return !edev || (edev->mode & EEH_DEV_REMOVED);
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}
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static bool eeh_edev_actionable(struct eeh_dev *edev)
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{
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if (!edev->pdev)
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return false;
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if (edev->pdev->error_state == pci_channel_io_perm_failure)
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return false;
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if (eeh_dev_removed(edev))
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return false;
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if (eeh_pe_passed(edev->pe))
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return false;
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return true;
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}
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/**
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* eeh_pcid_get - Get the PCI device driver
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* @pdev: PCI device
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*
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* The function is used to retrieve the PCI device driver for
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* the indicated PCI device. Besides, we will increase the reference
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* of the PCI device driver to prevent that being unloaded on
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* the fly. Otherwise, kernel crash would be seen.
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*/
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static inline struct pci_driver *eeh_pcid_get(struct pci_dev *pdev)
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{
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if (!pdev || !pdev->dev.driver)
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return NULL;
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if (!try_module_get(pdev->dev.driver->owner))
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return NULL;
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return to_pci_driver(pdev->dev.driver);
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}
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/**
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* eeh_pcid_put - Dereference on the PCI device driver
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* @pdev: PCI device
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*
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* The function is called to do dereference on the PCI device
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* driver of the indicated PCI device.
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*/
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static inline void eeh_pcid_put(struct pci_dev *pdev)
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{
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if (!pdev || !pdev->dev.driver)
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return;
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module_put(pdev->dev.driver->owner);
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}
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/**
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* eeh_disable_irq - Disable interrupt for the recovering device
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* @dev: PCI device
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*
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* This routine must be called when reporting temporary or permanent
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* error to the particular PCI device to disable interrupt of that
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* device. If the device has enabled MSI or MSI-X interrupt, we needn't
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* do real work because EEH should freeze DMA transfers for those PCI
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* devices encountering EEH errors, which includes MSI or MSI-X.
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*/
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static void eeh_disable_irq(struct eeh_dev *edev)
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{
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/* Don't disable MSI and MSI-X interrupts. They are
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* effectively disabled by the DMA Stopped state
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* when an EEH error occurs.
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*/
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if (edev->pdev->msi_enabled || edev->pdev->msix_enabled)
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return;
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if (!irq_has_action(edev->pdev->irq))
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return;
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edev->mode |= EEH_DEV_IRQ_DISABLED;
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disable_irq_nosync(edev->pdev->irq);
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}
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/**
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* eeh_enable_irq - Enable interrupt for the recovering device
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* @dev: PCI device
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*
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* This routine must be called to enable interrupt while failed
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* device could be resumed.
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*/
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static void eeh_enable_irq(struct eeh_dev *edev)
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{
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if ((edev->mode) & EEH_DEV_IRQ_DISABLED) {
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edev->mode &= ~EEH_DEV_IRQ_DISABLED;
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/*
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* FIXME !!!!!
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*
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* This is just ass backwards. This maze has
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* unbalanced irq_enable/disable calls. So instead of
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* finding the root cause it works around the warning
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* in the irq_enable code by conditionally calling
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* into it.
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*
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* That's just wrong.The warning in the core code is
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* there to tell people to fix their asymmetries in
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* their own code, not by abusing the core information
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* to avoid it.
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*
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* I so wish that the assymetry would be the other way
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* round and a few more irq_disable calls render that
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* shit unusable forever.
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*
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* tglx
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*/
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if (irqd_irq_disabled(irq_get_irq_data(edev->pdev->irq)))
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enable_irq(edev->pdev->irq);
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}
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}
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static void eeh_dev_save_state(struct eeh_dev *edev, void *userdata)
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{
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struct pci_dev *pdev;
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if (!edev)
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return;
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/*
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* We cannot access the config space on some adapters.
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* Otherwise, it will cause fenced PHB. We don't save
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* the content in their config space and will restore
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* from the initial config space saved when the EEH
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* device is created.
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*/
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if (edev->pe && (edev->pe->state & EEH_PE_CFG_RESTRICTED))
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return;
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pdev = eeh_dev_to_pci_dev(edev);
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if (!pdev)
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return;
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pci_save_state(pdev);
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}
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static void eeh_set_channel_state(struct eeh_pe *root, pci_channel_state_t s)
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{
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struct eeh_pe *pe;
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struct eeh_dev *edev, *tmp;
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eeh_for_each_pe(root, pe)
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eeh_pe_for_each_dev(pe, edev, tmp)
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if (eeh_edev_actionable(edev))
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edev->pdev->error_state = s;
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}
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static void eeh_set_irq_state(struct eeh_pe *root, bool enable)
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{
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struct eeh_pe *pe;
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struct eeh_dev *edev, *tmp;
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eeh_for_each_pe(root, pe) {
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eeh_pe_for_each_dev(pe, edev, tmp) {
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if (!eeh_edev_actionable(edev))
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continue;
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if (!eeh_pcid_get(edev->pdev))
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continue;
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if (enable)
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eeh_enable_irq(edev);
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else
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eeh_disable_irq(edev);
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eeh_pcid_put(edev->pdev);
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}
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}
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}
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typedef enum pci_ers_result (*eeh_report_fn)(struct eeh_dev *,
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struct pci_dev *,
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struct pci_driver *);
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static void eeh_pe_report_edev(struct eeh_dev *edev, eeh_report_fn fn,
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enum pci_ers_result *result)
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{
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struct pci_dev *pdev;
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struct pci_driver *driver;
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enum pci_ers_result new_result;
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pci_lock_rescan_remove();
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pdev = edev->pdev;
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if (pdev)
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get_device(&pdev->dev);
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pci_unlock_rescan_remove();
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if (!pdev) {
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eeh_edev_info(edev, "no device");
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return;
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}
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device_lock(&pdev->dev);
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if (eeh_edev_actionable(edev)) {
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driver = eeh_pcid_get(pdev);
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if (!driver)
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eeh_edev_info(edev, "no driver");
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else if (!driver->err_handler)
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eeh_edev_info(edev, "driver not EEH aware");
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else if (edev->mode & EEH_DEV_NO_HANDLER)
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eeh_edev_info(edev, "driver bound too late");
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else {
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new_result = fn(edev, pdev, driver);
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eeh_edev_info(edev, "%s driver reports: '%s'",
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driver->name,
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pci_ers_result_name(new_result));
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if (result)
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*result = pci_ers_merge_result(*result,
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new_result);
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}
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if (driver)
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eeh_pcid_put(pdev);
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} else {
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eeh_edev_info(edev, "not actionable (%d,%d,%d)", !!pdev,
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!eeh_dev_removed(edev), !eeh_pe_passed(edev->pe));
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}
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device_unlock(&pdev->dev);
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if (edev->pdev != pdev)
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eeh_edev_warn(edev, "Device changed during processing!\n");
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put_device(&pdev->dev);
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}
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static void eeh_pe_report(const char *name, struct eeh_pe *root,
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eeh_report_fn fn, enum pci_ers_result *result)
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{
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struct eeh_pe *pe;
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struct eeh_dev *edev, *tmp;
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pr_info("EEH: Beginning: '%s'\n", name);
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eeh_for_each_pe(root, pe) eeh_pe_for_each_dev(pe, edev, tmp)
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eeh_pe_report_edev(edev, fn, result);
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if (result)
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pr_info("EEH: Finished:'%s' with aggregate recovery state:'%s'\n",
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name, pci_ers_result_name(*result));
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else
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pr_info("EEH: Finished:'%s'", name);
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}
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/**
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* eeh_report_error - Report pci error to each device driver
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* @edev: eeh device
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* @driver: device's PCI driver
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*
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* Report an EEH error to each device driver.
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*/
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static enum pci_ers_result eeh_report_error(struct eeh_dev *edev,
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struct pci_dev *pdev,
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struct pci_driver *driver)
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{
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enum pci_ers_result rc;
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if (!driver->err_handler->error_detected)
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return PCI_ERS_RESULT_NONE;
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eeh_edev_info(edev, "Invoking %s->error_detected(IO frozen)",
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driver->name);
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rc = driver->err_handler->error_detected(pdev, pci_channel_io_frozen);
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edev->in_error = true;
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pci_uevent_ers(pdev, PCI_ERS_RESULT_NONE);
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return rc;
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}
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/**
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* eeh_report_mmio_enabled - Tell drivers that MMIO has been enabled
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* @edev: eeh device
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* @driver: device's PCI driver
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*
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* Tells each device driver that IO ports, MMIO and config space I/O
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* are now enabled.
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*/
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static enum pci_ers_result eeh_report_mmio_enabled(struct eeh_dev *edev,
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struct pci_dev *pdev,
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struct pci_driver *driver)
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{
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if (!driver->err_handler->mmio_enabled)
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return PCI_ERS_RESULT_NONE;
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eeh_edev_info(edev, "Invoking %s->mmio_enabled()", driver->name);
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return driver->err_handler->mmio_enabled(pdev);
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}
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/**
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* eeh_report_reset - Tell device that slot has been reset
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* @edev: eeh device
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* @driver: device's PCI driver
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*
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* This routine must be called while EEH tries to reset particular
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* PCI device so that the associated PCI device driver could take
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* some actions, usually to save data the driver needs so that the
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* driver can work again while the device is recovered.
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*/
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static enum pci_ers_result eeh_report_reset(struct eeh_dev *edev,
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struct pci_dev *pdev,
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struct pci_driver *driver)
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{
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if (!driver->err_handler->slot_reset || !edev->in_error)
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return PCI_ERS_RESULT_NONE;
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eeh_edev_info(edev, "Invoking %s->slot_reset()", driver->name);
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return driver->err_handler->slot_reset(pdev);
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}
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static void eeh_dev_restore_state(struct eeh_dev *edev, void *userdata)
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{
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struct pci_dev *pdev;
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if (!edev)
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return;
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/*
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* The content in the config space isn't saved because
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* the blocked config space on some adapters. We have
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* to restore the initial saved config space when the
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* EEH device is created.
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*/
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if (edev->pe && (edev->pe->state & EEH_PE_CFG_RESTRICTED)) {
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if (list_is_last(&edev->entry, &edev->pe->edevs))
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eeh_pe_restore_bars(edev->pe);
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return;
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}
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pdev = eeh_dev_to_pci_dev(edev);
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if (!pdev)
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return;
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pci_restore_state(pdev);
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}
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/**
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* eeh_report_resume - Tell device to resume normal operations
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* @edev: eeh device
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* @driver: device's PCI driver
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*
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* This routine must be called to notify the device driver that it
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* could resume so that the device driver can do some initialization
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* to make the recovered device work again.
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*/
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static enum pci_ers_result eeh_report_resume(struct eeh_dev *edev,
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struct pci_dev *pdev,
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struct pci_driver *driver)
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{
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if (!driver->err_handler->resume || !edev->in_error)
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return PCI_ERS_RESULT_NONE;
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eeh_edev_info(edev, "Invoking %s->resume()", driver->name);
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driver->err_handler->resume(pdev);
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pci_uevent_ers(edev->pdev, PCI_ERS_RESULT_RECOVERED);
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#ifdef CONFIG_PCI_IOV
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if (eeh_ops->notify_resume)
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eeh_ops->notify_resume(edev);
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#endif
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return PCI_ERS_RESULT_NONE;
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}
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/**
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* eeh_report_failure - Tell device driver that device is dead.
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* @edev: eeh device
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* @driver: device's PCI driver
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*
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* This informs the device driver that the device is permanently
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* dead, and that no further recovery attempts will be made on it.
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*/
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static enum pci_ers_result eeh_report_failure(struct eeh_dev *edev,
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struct pci_dev *pdev,
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struct pci_driver *driver)
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{
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enum pci_ers_result rc;
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if (!driver->err_handler->error_detected)
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return PCI_ERS_RESULT_NONE;
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eeh_edev_info(edev, "Invoking %s->error_detected(permanent failure)",
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driver->name);
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rc = driver->err_handler->error_detected(pdev,
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pci_channel_io_perm_failure);
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pci_uevent_ers(pdev, PCI_ERS_RESULT_DISCONNECT);
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return rc;
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}
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static void *eeh_add_virt_device(struct eeh_dev *edev)
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{
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struct pci_driver *driver;
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struct pci_dev *dev = eeh_dev_to_pci_dev(edev);
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if (!(edev->physfn)) {
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eeh_edev_warn(edev, "Not for VF\n");
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return NULL;
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}
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driver = eeh_pcid_get(dev);
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if (driver) {
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if (driver->err_handler) {
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eeh_pcid_put(dev);
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return NULL;
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}
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eeh_pcid_put(dev);
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}
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#ifdef CONFIG_PCI_IOV
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pci_iov_add_virtfn(edev->physfn, edev->vf_index);
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#endif
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return NULL;
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}
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static void eeh_rmv_device(struct eeh_dev *edev, void *userdata)
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{
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struct pci_driver *driver;
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struct pci_dev *dev = eeh_dev_to_pci_dev(edev);
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struct eeh_rmv_data *rmv_data = (struct eeh_rmv_data *)userdata;
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/*
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* Actually, we should remove the PCI bridges as well.
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* However, that's lots of complexity to do that,
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* particularly some of devices under the bridge might
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* support EEH. So we just care about PCI devices for
|
|
* simplicity here.
|
|
*/
|
|
if (!eeh_edev_actionable(edev) ||
|
|
(dev->hdr_type == PCI_HEADER_TYPE_BRIDGE))
|
|
return;
|
|
|
|
if (rmv_data) {
|
|
driver = eeh_pcid_get(dev);
|
|
if (driver) {
|
|
if (driver->err_handler &&
|
|
driver->err_handler->error_detected &&
|
|
driver->err_handler->slot_reset) {
|
|
eeh_pcid_put(dev);
|
|
return;
|
|
}
|
|
eeh_pcid_put(dev);
|
|
}
|
|
}
|
|
|
|
/* Remove it from PCI subsystem */
|
|
pr_info("EEH: Removing %s without EEH sensitive driver\n",
|
|
pci_name(dev));
|
|
edev->mode |= EEH_DEV_DISCONNECTED;
|
|
if (rmv_data)
|
|
rmv_data->removed_dev_count++;
|
|
|
|
if (edev->physfn) {
|
|
#ifdef CONFIG_PCI_IOV
|
|
pci_iov_remove_virtfn(edev->physfn, edev->vf_index);
|
|
edev->pdev = NULL;
|
|
#endif
|
|
if (rmv_data)
|
|
list_add(&edev->rmv_entry, &rmv_data->removed_vf_list);
|
|
} else {
|
|
pci_lock_rescan_remove();
|
|
pci_stop_and_remove_bus_device(dev);
|
|
pci_unlock_rescan_remove();
|
|
}
|
|
}
|
|
|
|
static void *eeh_pe_detach_dev(struct eeh_pe *pe, void *userdata)
|
|
{
|
|
struct eeh_dev *edev, *tmp;
|
|
|
|
eeh_pe_for_each_dev(pe, edev, tmp) {
|
|
if (!(edev->mode & EEH_DEV_DISCONNECTED))
|
|
continue;
|
|
|
|
edev->mode &= ~(EEH_DEV_DISCONNECTED | EEH_DEV_IRQ_DISABLED);
|
|
eeh_pe_tree_remove(edev);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Explicitly clear PE's frozen state for PowerNV where
|
|
* we have frozen PE until BAR restore is completed. It's
|
|
* harmless to clear it for pSeries. To be consistent with
|
|
* PE reset (for 3 times), we try to clear the frozen state
|
|
* for 3 times as well.
|
|
*/
|
|
static int eeh_clear_pe_frozen_state(struct eeh_pe *root, bool include_passed)
|
|
{
|
|
struct eeh_pe *pe;
|
|
int i;
|
|
|
|
eeh_for_each_pe(root, pe) {
|
|
if (include_passed || !eeh_pe_passed(pe)) {
|
|
for (i = 0; i < 3; i++)
|
|
if (!eeh_unfreeze_pe(pe))
|
|
break;
|
|
if (i >= 3)
|
|
return -EIO;
|
|
}
|
|
}
|
|
eeh_pe_state_clear(root, EEH_PE_ISOLATED, include_passed);
|
|
return 0;
|
|
}
|
|
|
|
int eeh_pe_reset_and_recover(struct eeh_pe *pe)
|
|
{
|
|
int ret;
|
|
|
|
/* Bail if the PE is being recovered */
|
|
if (pe->state & EEH_PE_RECOVERING)
|
|
return 0;
|
|
|
|
/* Put the PE into recovery mode */
|
|
eeh_pe_state_mark(pe, EEH_PE_RECOVERING);
|
|
|
|
/* Save states */
|
|
eeh_pe_dev_traverse(pe, eeh_dev_save_state, NULL);
|
|
|
|
/* Issue reset */
|
|
ret = eeh_pe_reset_full(pe, true);
|
|
if (ret) {
|
|
eeh_pe_state_clear(pe, EEH_PE_RECOVERING, true);
|
|
return ret;
|
|
}
|
|
|
|
/* Unfreeze the PE */
|
|
ret = eeh_clear_pe_frozen_state(pe, true);
|
|
if (ret) {
|
|
eeh_pe_state_clear(pe, EEH_PE_RECOVERING, true);
|
|
return ret;
|
|
}
|
|
|
|
/* Restore device state */
|
|
eeh_pe_dev_traverse(pe, eeh_dev_restore_state, NULL);
|
|
|
|
/* Clear recovery mode */
|
|
eeh_pe_state_clear(pe, EEH_PE_RECOVERING, true);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* eeh_reset_device - Perform actual reset of a pci slot
|
|
* @driver_eeh_aware: Does the device's driver provide EEH support?
|
|
* @pe: EEH PE
|
|
* @bus: PCI bus corresponding to the isolcated slot
|
|
* @rmv_data: Optional, list to record removed devices
|
|
*
|
|
* This routine must be called to do reset on the indicated PE.
|
|
* During the reset, udev might be invoked because those affected
|
|
* PCI devices will be removed and then added.
|
|
*/
|
|
static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus,
|
|
struct eeh_rmv_data *rmv_data,
|
|
bool driver_eeh_aware)
|
|
{
|
|
time64_t tstamp;
|
|
int cnt, rc;
|
|
struct eeh_dev *edev;
|
|
struct eeh_pe *tmp_pe;
|
|
bool any_passed = false;
|
|
|
|
eeh_for_each_pe(pe, tmp_pe)
|
|
any_passed |= eeh_pe_passed(tmp_pe);
|
|
|
|
/* pcibios will clear the counter; save the value */
|
|
cnt = pe->freeze_count;
|
|
tstamp = pe->tstamp;
|
|
|
|
/*
|
|
* We don't remove the corresponding PE instances because
|
|
* we need the information afterwords. The attached EEH
|
|
* devices are expected to be attached soon when calling
|
|
* into pci_hp_add_devices().
|
|
*/
|
|
eeh_pe_state_mark(pe, EEH_PE_KEEP);
|
|
if (any_passed || driver_eeh_aware || (pe->type & EEH_PE_VF)) {
|
|
eeh_pe_dev_traverse(pe, eeh_rmv_device, rmv_data);
|
|
} else {
|
|
pci_lock_rescan_remove();
|
|
pci_hp_remove_devices(bus);
|
|
pci_unlock_rescan_remove();
|
|
}
|
|
|
|
/*
|
|
* Reset the pci controller. (Asserts RST#; resets config space).
|
|
* Reconfigure bridges and devices. Don't try to bring the system
|
|
* up if the reset failed for some reason.
|
|
*
|
|
* During the reset, it's very dangerous to have uncontrolled PCI
|
|
* config accesses. So we prefer to block them. However, controlled
|
|
* PCI config accesses initiated from EEH itself are allowed.
|
|
*/
|
|
rc = eeh_pe_reset_full(pe, false);
|
|
if (rc)
|
|
return rc;
|
|
|
|
pci_lock_rescan_remove();
|
|
|
|
/* Restore PE */
|
|
eeh_ops->configure_bridge(pe);
|
|
eeh_pe_restore_bars(pe);
|
|
|
|
/* Clear frozen state */
|
|
rc = eeh_clear_pe_frozen_state(pe, false);
|
|
if (rc) {
|
|
pci_unlock_rescan_remove();
|
|
return rc;
|
|
}
|
|
|
|
/* Give the system 5 seconds to finish running the user-space
|
|
* hotplug shutdown scripts, e.g. ifdown for ethernet. Yes,
|
|
* this is a hack, but if we don't do this, and try to bring
|
|
* the device up before the scripts have taken it down,
|
|
* potentially weird things happen.
|
|
*/
|
|
if (!driver_eeh_aware || rmv_data->removed_dev_count) {
|
|
pr_info("EEH: Sleep 5s ahead of %s hotplug\n",
|
|
(driver_eeh_aware ? "partial" : "complete"));
|
|
ssleep(5);
|
|
|
|
/*
|
|
* The EEH device is still connected with its parent
|
|
* PE. We should disconnect it so the binding can be
|
|
* rebuilt when adding PCI devices.
|
|
*/
|
|
edev = list_first_entry(&pe->edevs, struct eeh_dev, entry);
|
|
eeh_pe_traverse(pe, eeh_pe_detach_dev, NULL);
|
|
if (pe->type & EEH_PE_VF) {
|
|
eeh_add_virt_device(edev);
|
|
} else {
|
|
if (!driver_eeh_aware)
|
|
eeh_pe_state_clear(pe, EEH_PE_PRI_BUS, true);
|
|
pci_hp_add_devices(bus);
|
|
}
|
|
}
|
|
eeh_pe_state_clear(pe, EEH_PE_KEEP, true);
|
|
|
|
pe->tstamp = tstamp;
|
|
pe->freeze_count = cnt;
|
|
|
|
pci_unlock_rescan_remove();
|
|
return 0;
|
|
}
|
|
|
|
/* The longest amount of time to wait for a pci device
|
|
* to come back on line, in seconds.
|
|
*/
|
|
#define MAX_WAIT_FOR_RECOVERY 300
|
|
|
|
|
|
/* Walks the PE tree after processing an event to remove any stale PEs.
|
|
*
|
|
* NB: This needs to be recursive to ensure the leaf PEs get removed
|
|
* before their parents do. Although this is possible to do recursively
|
|
* we don't since this is easier to read and we need to garantee
|
|
* the leaf nodes will be handled first.
|
|
*/
|
|
static void eeh_pe_cleanup(struct eeh_pe *pe)
|
|
{
|
|
struct eeh_pe *child_pe, *tmp;
|
|
|
|
list_for_each_entry_safe(child_pe, tmp, &pe->child_list, child)
|
|
eeh_pe_cleanup(child_pe);
|
|
|
|
if (pe->state & EEH_PE_KEEP)
|
|
return;
|
|
|
|
if (!(pe->state & EEH_PE_INVALID))
|
|
return;
|
|
|
|
if (list_empty(&pe->edevs) && list_empty(&pe->child_list)) {
|
|
list_del(&pe->child);
|
|
kfree(pe);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* eeh_check_slot_presence - Check if a device is still present in a slot
|
|
* @pdev: pci_dev to check
|
|
*
|
|
* This function may return a false positive if we can't determine the slot's
|
|
* presence state. This might happen for for PCIe slots if the PE containing
|
|
* the upstream bridge is also frozen, or the bridge is part of the same PE
|
|
* as the device.
|
|
*
|
|
* This shouldn't happen often, but you might see it if you hotplug a PCIe
|
|
* switch.
|
|
*/
|
|
static bool eeh_slot_presence_check(struct pci_dev *pdev)
|
|
{
|
|
const struct hotplug_slot_ops *ops;
|
|
struct pci_slot *slot;
|
|
u8 state;
|
|
int rc;
|
|
|
|
if (!pdev)
|
|
return false;
|
|
|
|
if (pdev->error_state == pci_channel_io_perm_failure)
|
|
return false;
|
|
|
|
slot = pdev->slot;
|
|
if (!slot || !slot->hotplug)
|
|
return true;
|
|
|
|
ops = slot->hotplug->ops;
|
|
if (!ops || !ops->get_adapter_status)
|
|
return true;
|
|
|
|
/* set the attention indicator while we've got the slot ops */
|
|
if (ops->set_attention_status)
|
|
ops->set_attention_status(slot->hotplug, 1);
|
|
|
|
rc = ops->get_adapter_status(slot->hotplug, &state);
|
|
if (rc)
|
|
return true;
|
|
|
|
return !!state;
|
|
}
|
|
|
|
static void eeh_clear_slot_attention(struct pci_dev *pdev)
|
|
{
|
|
const struct hotplug_slot_ops *ops;
|
|
struct pci_slot *slot;
|
|
|
|
if (!pdev)
|
|
return;
|
|
|
|
if (pdev->error_state == pci_channel_io_perm_failure)
|
|
return;
|
|
|
|
slot = pdev->slot;
|
|
if (!slot || !slot->hotplug)
|
|
return;
|
|
|
|
ops = slot->hotplug->ops;
|
|
if (!ops || !ops->set_attention_status)
|
|
return;
|
|
|
|
ops->set_attention_status(slot->hotplug, 0);
|
|
}
|
|
|
|
/**
|
|
* eeh_handle_normal_event - Handle EEH events on a specific PE
|
|
* @pe: EEH PE - which should not be used after we return, as it may
|
|
* have been invalidated.
|
|
*
|
|
* Attempts to recover the given PE. If recovery fails or the PE has failed
|
|
* too many times, remove the PE.
|
|
*
|
|
* While PHB detects address or data parity errors on particular PCI
|
|
* slot, the associated PE will be frozen. Besides, DMA's occurring
|
|
* to wild addresses (which usually happen due to bugs in device
|
|
* drivers or in PCI adapter firmware) can cause EEH error. #SERR,
|
|
* #PERR or other misc PCI-related errors also can trigger EEH errors.
|
|
*
|
|
* Recovery process consists of unplugging the device driver (which
|
|
* generated hotplug events to userspace), then issuing a PCI #RST to
|
|
* the device, then reconfiguring the PCI config space for all bridges
|
|
* & devices under this slot, and then finally restarting the device
|
|
* drivers (which cause a second set of hotplug events to go out to
|
|
* userspace).
|
|
*/
|
|
void eeh_handle_normal_event(struct eeh_pe *pe)
|
|
{
|
|
struct pci_bus *bus;
|
|
struct eeh_dev *edev, *tmp;
|
|
struct eeh_pe *tmp_pe;
|
|
int rc = 0;
|
|
enum pci_ers_result result = PCI_ERS_RESULT_NONE;
|
|
struct eeh_rmv_data rmv_data =
|
|
{LIST_HEAD_INIT(rmv_data.removed_vf_list), 0};
|
|
int devices = 0;
|
|
|
|
bus = eeh_pe_bus_get(pe);
|
|
if (!bus) {
|
|
pr_err("%s: Cannot find PCI bus for PHB#%x-PE#%x\n",
|
|
__func__, pe->phb->global_number, pe->addr);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* When devices are hot-removed we might get an EEH due to
|
|
* a driver attempting to touch the MMIO space of a removed
|
|
* device. In this case we don't have a device to recover
|
|
* so suppress the event if we can't find any present devices.
|
|
*
|
|
* The hotplug driver should take care of tearing down the
|
|
* device itself.
|
|
*/
|
|
eeh_for_each_pe(pe, tmp_pe)
|
|
eeh_pe_for_each_dev(tmp_pe, edev, tmp)
|
|
if (eeh_slot_presence_check(edev->pdev))
|
|
devices++;
|
|
|
|
if (!devices) {
|
|
pr_debug("EEH: Frozen PHB#%x-PE#%x is empty!\n",
|
|
pe->phb->global_number, pe->addr);
|
|
goto out; /* nothing to recover */
|
|
}
|
|
|
|
/* Log the event */
|
|
if (pe->type & EEH_PE_PHB) {
|
|
pr_err("EEH: Recovering PHB#%x, location: %s\n",
|
|
pe->phb->global_number, eeh_pe_loc_get(pe));
|
|
} else {
|
|
struct eeh_pe *phb_pe = eeh_phb_pe_get(pe->phb);
|
|
|
|
pr_err("EEH: Recovering PHB#%x-PE#%x\n",
|
|
pe->phb->global_number, pe->addr);
|
|
pr_err("EEH: PE location: %s, PHB location: %s\n",
|
|
eeh_pe_loc_get(pe), eeh_pe_loc_get(phb_pe));
|
|
}
|
|
|
|
#ifdef CONFIG_STACKTRACE
|
|
/*
|
|
* Print the saved stack trace now that we've verified there's
|
|
* something to recover.
|
|
*/
|
|
if (pe->trace_entries) {
|
|
void **ptrs = (void **) pe->stack_trace;
|
|
int i;
|
|
|
|
pr_err("EEH: Frozen PHB#%x-PE#%x detected\n",
|
|
pe->phb->global_number, pe->addr);
|
|
|
|
/* FIXME: Use the same format as dump_stack() */
|
|
pr_err("EEH: Call Trace:\n");
|
|
for (i = 0; i < pe->trace_entries; i++)
|
|
pr_err("EEH: [%pK] %pS\n", ptrs[i], ptrs[i]);
|
|
|
|
pe->trace_entries = 0;
|
|
}
|
|
#endif /* CONFIG_STACKTRACE */
|
|
|
|
eeh_pe_update_time_stamp(pe);
|
|
pe->freeze_count++;
|
|
if (pe->freeze_count > eeh_max_freezes) {
|
|
pr_err("EEH: PHB#%x-PE#%x has failed %d times in the last hour and has been permanently disabled.\n",
|
|
pe->phb->global_number, pe->addr,
|
|
pe->freeze_count);
|
|
result = PCI_ERS_RESULT_DISCONNECT;
|
|
}
|
|
|
|
eeh_for_each_pe(pe, tmp_pe)
|
|
eeh_pe_for_each_dev(tmp_pe, edev, tmp)
|
|
edev->mode &= ~EEH_DEV_NO_HANDLER;
|
|
|
|
/* Walk the various device drivers attached to this slot through
|
|
* a reset sequence, giving each an opportunity to do what it needs
|
|
* to accomplish the reset. Each child gets a report of the
|
|
* status ... if any child can't handle the reset, then the entire
|
|
* slot is dlpar removed and added.
|
|
*
|
|
* When the PHB is fenced, we have to issue a reset to recover from
|
|
* the error. Override the result if necessary to have partially
|
|
* hotplug for this case.
|
|
*/
|
|
if (result != PCI_ERS_RESULT_DISCONNECT) {
|
|
pr_warn("EEH: This PCI device has failed %d times in the last hour and will be permanently disabled after %d failures.\n",
|
|
pe->freeze_count, eeh_max_freezes);
|
|
pr_info("EEH: Notify device drivers to shutdown\n");
|
|
eeh_set_channel_state(pe, pci_channel_io_frozen);
|
|
eeh_set_irq_state(pe, false);
|
|
eeh_pe_report("error_detected(IO frozen)", pe,
|
|
eeh_report_error, &result);
|
|
if ((pe->type & EEH_PE_PHB) &&
|
|
result != PCI_ERS_RESULT_NONE &&
|
|
result != PCI_ERS_RESULT_NEED_RESET)
|
|
result = PCI_ERS_RESULT_NEED_RESET;
|
|
}
|
|
|
|
/* Get the current PCI slot state. This can take a long time,
|
|
* sometimes over 300 seconds for certain systems.
|
|
*/
|
|
if (result != PCI_ERS_RESULT_DISCONNECT) {
|
|
rc = eeh_wait_state(pe, MAX_WAIT_FOR_RECOVERY*1000);
|
|
if (rc < 0 || rc == EEH_STATE_NOT_SUPPORT) {
|
|
pr_warn("EEH: Permanent failure\n");
|
|
result = PCI_ERS_RESULT_DISCONNECT;
|
|
}
|
|
}
|
|
|
|
/* Since rtas may enable MMIO when posting the error log,
|
|
* don't post the error log until after all dev drivers
|
|
* have been informed.
|
|
*/
|
|
if (result != PCI_ERS_RESULT_DISCONNECT) {
|
|
pr_info("EEH: Collect temporary log\n");
|
|
eeh_slot_error_detail(pe, EEH_LOG_TEMP);
|
|
}
|
|
|
|
/* If all device drivers were EEH-unaware, then shut
|
|
* down all of the device drivers, and hope they
|
|
* go down willingly, without panicing the system.
|
|
*/
|
|
if (result == PCI_ERS_RESULT_NONE) {
|
|
pr_info("EEH: Reset with hotplug activity\n");
|
|
rc = eeh_reset_device(pe, bus, NULL, false);
|
|
if (rc) {
|
|
pr_warn("%s: Unable to reset, err=%d\n",
|
|
__func__, rc);
|
|
result = PCI_ERS_RESULT_DISCONNECT;
|
|
}
|
|
}
|
|
|
|
/* If all devices reported they can proceed, then re-enable MMIO */
|
|
if (result == PCI_ERS_RESULT_CAN_RECOVER) {
|
|
pr_info("EEH: Enable I/O for affected devices\n");
|
|
rc = eeh_pci_enable(pe, EEH_OPT_THAW_MMIO);
|
|
|
|
if (rc < 0) {
|
|
result = PCI_ERS_RESULT_DISCONNECT;
|
|
} else if (rc) {
|
|
result = PCI_ERS_RESULT_NEED_RESET;
|
|
} else {
|
|
pr_info("EEH: Notify device drivers to resume I/O\n");
|
|
eeh_pe_report("mmio_enabled", pe,
|
|
eeh_report_mmio_enabled, &result);
|
|
}
|
|
}
|
|
|
|
/* If all devices reported they can proceed, then re-enable DMA */
|
|
if (result == PCI_ERS_RESULT_CAN_RECOVER) {
|
|
pr_info("EEH: Enabled DMA for affected devices\n");
|
|
rc = eeh_pci_enable(pe, EEH_OPT_THAW_DMA);
|
|
|
|
if (rc < 0) {
|
|
result = PCI_ERS_RESULT_DISCONNECT;
|
|
} else if (rc) {
|
|
result = PCI_ERS_RESULT_NEED_RESET;
|
|
} else {
|
|
/*
|
|
* We didn't do PE reset for the case. The PE
|
|
* is still in frozen state. Clear it before
|
|
* resuming the PE.
|
|
*/
|
|
eeh_pe_state_clear(pe, EEH_PE_ISOLATED, true);
|
|
result = PCI_ERS_RESULT_RECOVERED;
|
|
}
|
|
}
|
|
|
|
/* If any device called out for a reset, then reset the slot */
|
|
if (result == PCI_ERS_RESULT_NEED_RESET) {
|
|
pr_info("EEH: Reset without hotplug activity\n");
|
|
rc = eeh_reset_device(pe, bus, &rmv_data, true);
|
|
if (rc) {
|
|
pr_warn("%s: Cannot reset, err=%d\n",
|
|
__func__, rc);
|
|
result = PCI_ERS_RESULT_DISCONNECT;
|
|
} else {
|
|
result = PCI_ERS_RESULT_NONE;
|
|
eeh_set_channel_state(pe, pci_channel_io_normal);
|
|
eeh_set_irq_state(pe, true);
|
|
eeh_pe_report("slot_reset", pe, eeh_report_reset,
|
|
&result);
|
|
}
|
|
}
|
|
|
|
if ((result == PCI_ERS_RESULT_RECOVERED) ||
|
|
(result == PCI_ERS_RESULT_NONE)) {
|
|
/*
|
|
* For those hot removed VFs, we should add back them after PF
|
|
* get recovered properly.
|
|
*/
|
|
list_for_each_entry_safe(edev, tmp, &rmv_data.removed_vf_list,
|
|
rmv_entry) {
|
|
eeh_add_virt_device(edev);
|
|
list_del(&edev->rmv_entry);
|
|
}
|
|
|
|
/* Tell all device drivers that they can resume operations */
|
|
pr_info("EEH: Notify device driver to resume\n");
|
|
eeh_set_channel_state(pe, pci_channel_io_normal);
|
|
eeh_set_irq_state(pe, true);
|
|
eeh_pe_report("resume", pe, eeh_report_resume, NULL);
|
|
eeh_for_each_pe(pe, tmp_pe) {
|
|
eeh_pe_for_each_dev(tmp_pe, edev, tmp) {
|
|
edev->mode &= ~EEH_DEV_NO_HANDLER;
|
|
edev->in_error = false;
|
|
}
|
|
}
|
|
|
|
pr_info("EEH: Recovery successful.\n");
|
|
} else {
|
|
/*
|
|
* About 90% of all real-life EEH failures in the field
|
|
* are due to poorly seated PCI cards. Only 10% or so are
|
|
* due to actual, failed cards.
|
|
*/
|
|
pr_err("EEH: Unable to recover from failure from PHB#%x-PE#%x.\n"
|
|
"Please try reseating or replacing it\n",
|
|
pe->phb->global_number, pe->addr);
|
|
|
|
eeh_slot_error_detail(pe, EEH_LOG_PERM);
|
|
|
|
/* Notify all devices that they're about to go down. */
|
|
eeh_set_channel_state(pe, pci_channel_io_perm_failure);
|
|
eeh_set_irq_state(pe, false);
|
|
eeh_pe_report("error_detected(permanent failure)", pe,
|
|
eeh_report_failure, NULL);
|
|
|
|
/* Mark the PE to be removed permanently */
|
|
eeh_pe_state_mark(pe, EEH_PE_REMOVED);
|
|
|
|
/*
|
|
* Shut down the device drivers for good. We mark
|
|
* all removed devices correctly to avoid access
|
|
* the their PCI config any more.
|
|
*/
|
|
if (pe->type & EEH_PE_VF) {
|
|
eeh_pe_dev_traverse(pe, eeh_rmv_device, NULL);
|
|
eeh_pe_dev_mode_mark(pe, EEH_DEV_REMOVED);
|
|
} else {
|
|
eeh_pe_state_clear(pe, EEH_PE_PRI_BUS, true);
|
|
eeh_pe_dev_mode_mark(pe, EEH_DEV_REMOVED);
|
|
|
|
pci_lock_rescan_remove();
|
|
pci_hp_remove_devices(bus);
|
|
pci_unlock_rescan_remove();
|
|
/* The passed PE should no longer be used */
|
|
return;
|
|
}
|
|
}
|
|
|
|
out:
|
|
/*
|
|
* Clean up any PEs without devices. While marked as EEH_PE_RECOVERYING
|
|
* we don't want to modify the PE tree structure so we do it here.
|
|
*/
|
|
eeh_pe_cleanup(pe);
|
|
|
|
/* clear the slot attention LED for all recovered devices */
|
|
eeh_for_each_pe(pe, tmp_pe)
|
|
eeh_pe_for_each_dev(tmp_pe, edev, tmp)
|
|
eeh_clear_slot_attention(edev->pdev);
|
|
|
|
eeh_pe_state_clear(pe, EEH_PE_RECOVERING, true);
|
|
}
|
|
|
|
/**
|
|
* eeh_handle_special_event - Handle EEH events without a specific failing PE
|
|
*
|
|
* Called when an EEH event is detected but can't be narrowed down to a
|
|
* specific PE. Iterates through possible failures and handles them as
|
|
* necessary.
|
|
*/
|
|
void eeh_handle_special_event(void)
|
|
{
|
|
struct eeh_pe *pe, *phb_pe, *tmp_pe;
|
|
struct eeh_dev *edev, *tmp_edev;
|
|
struct pci_bus *bus;
|
|
struct pci_controller *hose;
|
|
unsigned long flags;
|
|
int rc;
|
|
|
|
|
|
do {
|
|
rc = eeh_ops->next_error(&pe);
|
|
|
|
switch (rc) {
|
|
case EEH_NEXT_ERR_DEAD_IOC:
|
|
/* Mark all PHBs in dead state */
|
|
eeh_serialize_lock(&flags);
|
|
|
|
/* Purge all events */
|
|
eeh_remove_event(NULL, true);
|
|
|
|
list_for_each_entry(hose, &hose_list, list_node) {
|
|
phb_pe = eeh_phb_pe_get(hose);
|
|
if (!phb_pe) continue;
|
|
|
|
eeh_pe_mark_isolated(phb_pe);
|
|
}
|
|
|
|
eeh_serialize_unlock(flags);
|
|
|
|
break;
|
|
case EEH_NEXT_ERR_FROZEN_PE:
|
|
case EEH_NEXT_ERR_FENCED_PHB:
|
|
case EEH_NEXT_ERR_DEAD_PHB:
|
|
/* Mark the PE in fenced state */
|
|
eeh_serialize_lock(&flags);
|
|
|
|
/* Purge all events of the PHB */
|
|
eeh_remove_event(pe, true);
|
|
|
|
if (rc != EEH_NEXT_ERR_DEAD_PHB)
|
|
eeh_pe_state_mark(pe, EEH_PE_RECOVERING);
|
|
eeh_pe_mark_isolated(pe);
|
|
|
|
eeh_serialize_unlock(flags);
|
|
|
|
break;
|
|
case EEH_NEXT_ERR_NONE:
|
|
return;
|
|
default:
|
|
pr_warn("%s: Invalid value %d from next_error()\n",
|
|
__func__, rc);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* For fenced PHB and frozen PE, it's handled as normal
|
|
* event. We have to remove the affected PHBs for dead
|
|
* PHB and IOC
|
|
*/
|
|
if (rc == EEH_NEXT_ERR_FROZEN_PE ||
|
|
rc == EEH_NEXT_ERR_FENCED_PHB) {
|
|
eeh_pe_state_mark(pe, EEH_PE_RECOVERING);
|
|
eeh_handle_normal_event(pe);
|
|
} else {
|
|
eeh_for_each_pe(pe, tmp_pe)
|
|
eeh_pe_for_each_dev(tmp_pe, edev, tmp_edev)
|
|
edev->mode &= ~EEH_DEV_NO_HANDLER;
|
|
|
|
/* Notify all devices to be down */
|
|
eeh_pe_state_clear(pe, EEH_PE_PRI_BUS, true);
|
|
eeh_set_channel_state(pe, pci_channel_io_perm_failure);
|
|
eeh_pe_report(
|
|
"error_detected(permanent failure)", pe,
|
|
eeh_report_failure, NULL);
|
|
|
|
pci_lock_rescan_remove();
|
|
list_for_each_entry(hose, &hose_list, list_node) {
|
|
phb_pe = eeh_phb_pe_get(hose);
|
|
if (!phb_pe ||
|
|
!(phb_pe->state & EEH_PE_ISOLATED) ||
|
|
(phb_pe->state & EEH_PE_RECOVERING))
|
|
continue;
|
|
|
|
bus = eeh_pe_bus_get(phb_pe);
|
|
if (!bus) {
|
|
pr_err("%s: Cannot find PCI bus for "
|
|
"PHB#%x-PE#%x\n",
|
|
__func__,
|
|
pe->phb->global_number,
|
|
pe->addr);
|
|
break;
|
|
}
|
|
pci_hp_remove_devices(bus);
|
|
}
|
|
pci_unlock_rescan_remove();
|
|
}
|
|
|
|
/*
|
|
* If we have detected dead IOC, we needn't proceed
|
|
* any more since all PHBs would have been removed
|
|
*/
|
|
if (rc == EEH_NEXT_ERR_DEAD_IOC)
|
|
break;
|
|
} while (rc != EEH_NEXT_ERR_NONE);
|
|
}
|