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mhi: pci_generic: Add PCI error handlers

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In AER capable root complex, errors are reported to the host which
can then act accordingly and perform PCI recovering procedure.

This patch enables error reporting and implements error_detected,
slot_reset and resume callbacks.

Reviewed-by Hemant Kumar <hemantk@codeaurora.org>

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
This commit is contained in:
Loic Poulain 2021-01-04 17:14:55 +01:00 committed by Manivannan Sadhasivam
parent 7389337f0a
commit b012ee6bfe
1 changed files with 50 additions and 0 deletions
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50
drivers/bus/mhi/pci_generic.c
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@ -8,6 +8,7 @@
* Copyright (C) 2020 Linaro Ltd <loic.poulain@linaro.org>
*/
#include <linux/aer.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/mhi.h>
@ -405,6 +406,8 @@ static int mhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
pci_save_state(pdev);
mhi_pdev->pci_state = pci_store_saved_state(pdev);
pci_enable_pcie_error_reporting(pdev);
err = mhi_register_controller(mhi_cntrl, mhi_cntrl_config);
if (err)
return err;
@ -501,7 +504,54 @@ static void mhi_pci_reset_done(struct pci_dev *pdev)
set_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status);
}
static pci_ers_result_t mhi_pci_error_detected(struct pci_dev *pdev,
pci_channel_state_t state)
{
struct mhi_pci_device *mhi_pdev = pci_get_drvdata(pdev);
struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl;
dev_err(&pdev->dev, "PCI error detected, state = %u\n", state);
if (state == pci_channel_io_perm_failure)
return PCI_ERS_RESULT_DISCONNECT;
/* Clean up MHI state */
if (test_and_clear_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status)) {
mhi_power_down(mhi_cntrl, false);
mhi_unprepare_after_power_down(mhi_cntrl);
} else {
/* Nothing to do */
return PCI_ERS_RESULT_RECOVERED;
}
pci_disable_device(pdev);
return PCI_ERS_RESULT_NEED_RESET;
}
static pci_ers_result_t mhi_pci_slot_reset(struct pci_dev *pdev)
{
if (pci_enable_device(pdev)) {
dev_err(&pdev->dev, "Cannot re-enable PCI device after reset.\n");
return PCI_ERS_RESULT_DISCONNECT;
}
return PCI_ERS_RESULT_RECOVERED;
}
static void mhi_pci_io_resume(struct pci_dev *pdev)
{
struct mhi_pci_device *mhi_pdev = pci_get_drvdata(pdev);
dev_err(&pdev->dev, "PCI slot reset done\n");
queue_work(system_long_wq, &mhi_pdev->recovery_work);
}
static const struct pci_error_handlers mhi_pci_err_handler = {
.error_detected = mhi_pci_error_detected,
.slot_reset = mhi_pci_slot_reset,
.resume = mhi_pci_io_resume,
.reset_prepare = mhi_pci_reset_prepare,
.reset_done = mhi_pci_reset_done,
};