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net/mlx5: Print more info on pci error handlers

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In case mlx5_pci_err_detected was called with state equals to
pci_channel_io_perm_failure, the driver will never come back up.

It is nice to know why the driver went to zombie land, so print some
useful information on pci err handlers.

Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
This commit is contained in:
Saeed Mahameed 2021-10-04 18:39:51 -07:00
parent c64d01b3ce
commit fad1783a6d
1 changed files with 37 additions and 14 deletions
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51
drivers/net/ethernet/mellanox/mlx5/core/main.c
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@ -1604,12 +1604,28 @@ static void remove_one(struct pci_dev *pdev)
mlx5_devlink_free(devlink);
}
#define mlx5_pci_trace(dev, fmt, ...) ({ \
struct mlx5_core_dev *__dev = (dev); \
mlx5_core_info(__dev, "%s Device state = %d health sensors: %d pci_status: %d. " fmt, \
__func__, __dev->state, mlx5_health_check_fatal_sensors(__dev), \
__dev->pci_status, ##__VA_ARGS__); \
})
static const char *result2str(enum pci_ers_result result)
{
return result == PCI_ERS_RESULT_NEED_RESET ? "need reset" :
result == PCI_ERS_RESULT_DISCONNECT ? "disconnect" :
result == PCI_ERS_RESULT_RECOVERED ? "recovered" :
"unknown";
}
static pci_ers_result_t mlx5_pci_err_detected(struct pci_dev *pdev,
pci_channel_state_t state)
{
struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
enum pci_ers_result res;
mlx5_core_info(dev, "%s was called\n", __func__);
mlx5_pci_trace(dev, "Enter, pci channel state = %d\n", state);
mlx5_enter_error_state(dev, false);
mlx5_error_sw_reset(dev);
@ -1617,8 +1633,11 @@ static pci_ers_result_t mlx5_pci_err_detected(struct pci_dev *pdev,
mlx5_drain_health_wq(dev);
mlx5_pci_disable_device(dev);
return state == pci_channel_io_perm_failure ?
res = state == pci_channel_io_perm_failure ?
PCI_ERS_RESULT_DISCONNECT : PCI_ERS_RESULT_NEED_RESET;
mlx5_pci_trace(dev, "Exit, result = %d, %s\n", res, result2str(res));
return res;
}
/* wait for the device to show vital signs by waiting
@ -1652,28 +1671,34 @@ static int wait_vital(struct pci_dev *pdev)
static pci_ers_result_t mlx5_pci_slot_reset(struct pci_dev *pdev)
{
enum pci_ers_result res = PCI_ERS_RESULT_DISCONNECT;
struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
int err;
mlx5_core_info(dev, "%s was called\n", __func__);
mlx5_pci_trace(dev, "Enter\n");
err = mlx5_pci_enable_device(dev);
if (err) {
mlx5_core_err(dev, "%s: mlx5_pci_enable_device failed with error code: %d\n",
__func__, err);
return PCI_ERS_RESULT_DISCONNECT;
goto out;
}
pci_set_master(pdev);
pci_restore_state(pdev);
pci_save_state(pdev);
if (wait_vital(pdev)) {
mlx5_core_err(dev, "%s: wait_vital timed out\n", __func__);
return PCI_ERS_RESULT_DISCONNECT;
err = wait_vital(pdev);
if (err) {
mlx5_core_err(dev, "%s: wait vital failed with error code: %d\n",
__func__, err);
goto out;
}
return PCI_ERS_RESULT_RECOVERED;
res = PCI_ERS_RESULT_RECOVERED;
out:
mlx5_pci_trace(dev, "Exit, err = %d, result = %d, %s\n", err, res, result2str(res));
return res;
}
static void mlx5_pci_resume(struct pci_dev *pdev)
@ -1681,14 +1706,12 @@ static void mlx5_pci_resume(struct pci_dev *pdev)
struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
int err;
mlx5_core_info(dev, "%s was called\n", __func__);
mlx5_pci_trace(dev, "Enter, loading driver..\n");
err = mlx5_load_one(dev);
if (err)
mlx5_core_err(dev, "%s: mlx5_load_one failed with error code: %d\n",
__func__, err);
else
mlx5_core_info(dev, "%s: device recovered\n", __func__);
mlx5_pci_trace(dev, "Done, err = %d, device %s\n", err,
!err ? "recovered" : "Failed");
}
static const struct pci_error_handlers mlx5_err_handler = {