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NVMe: Add pci error handlers

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Requests enabling pcie aer support. Shuts down the controller on error
detected with io frozen state prior to requesting slot reset; resumes
controller after reset completes.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Keith Busch 2015-12-07 15:30:31 -07:00 committed by Jens Axboe
parent bbc758ec04
commit a0a3408ee6
1 changed files with 44 additions and 10 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

54
drivers/nvme/host/pci.c
View file

@ -12,6 +12,7 @@
* more details.
*/
#include <linux/aer.h>
#include <linux/bitops.h>
#include <linux/blkdev.h>
#include <linux/blk-mq.h>
@ -1670,6 +1671,8 @@ static int nvme_dev_map(struct nvme_dev *dev)
if (readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 2))
dev->cmb = nvme_map_cmb(dev);
pci_enable_pcie_error_reporting(pdev);
pci_save_state(pdev);
return 0;
unmap:
@ -1697,9 +1700,11 @@ static void nvme_dev_unmap(struct nvme_dev *dev)
pci_release_regions(pdev);
}
if (pci_is_enabled(pdev))
if (pci_is_enabled(pdev)) {
pci_disable_pcie_error_reporting(pdev);
pci_disable_device(pdev);
}
}
struct nvme_delq_ctx {
struct task_struct *waiter;
@ -2225,13 +2230,6 @@ static void nvme_remove(struct pci_dev *pdev)
nvme_put_ctrl(&dev->ctrl);
}
/* These functions are yet to be implemented */
#define nvme_error_detected NULL
#define nvme_dump_registers NULL
#define nvme_link_reset NULL
#define nvme_slot_reset NULL
#define nvme_error_resume NULL
#ifdef CONFIG_PM_SLEEP
static int nvme_suspend(struct device *dev)
{
@ -2254,10 +2252,46 @@ static int nvme_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops, nvme_suspend, nvme_resume);
static pci_ers_result_t nvme_error_detected(struct pci_dev *pdev,
pci_channel_state_t state)
{
struct nvme_dev *dev = pci_get_drvdata(pdev);
/*
* A frozen channel requires a reset. When detected, this method will
* shutdown the controller to quiesce. The controller will be restarted
* after the slot reset through driver's slot_reset callback.
*/
dev_warn(&pdev->dev, "error detected: state:%d\n", state);
switch (state) {
case pci_channel_io_normal:
return PCI_ERS_RESULT_CAN_RECOVER;
case pci_channel_io_frozen:
nvme_dev_shutdown(dev);
return PCI_ERS_RESULT_NEED_RESET;
case pci_channel_io_perm_failure:
return PCI_ERS_RESULT_DISCONNECT;
}
return PCI_ERS_RESULT_NEED_RESET;
}
static pci_ers_result_t nvme_slot_reset(struct pci_dev *pdev)
{
struct nvme_dev *dev = pci_get_drvdata(pdev);
dev_info(&pdev->dev, "restart after slot reset\n");
pci_restore_state(pdev);
queue_work(nvme_workq, &dev->reset_work);
return PCI_ERS_RESULT_RECOVERED;
}
static void nvme_error_resume(struct pci_dev *pdev)
{
pci_cleanup_aer_uncorrect_error_status(pdev);
}
static const struct pci_error_handlers nvme_err_handler = {
.error_detected = nvme_error_detected,
.mmio_enabled = nvme_dump_registers,
.link_reset = nvme_link_reset,
.slot_reset = nvme_slot_reset,
.resume = nvme_error_resume,
.reset_notify = nvme_reset_notify,