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Commit 9007bccd authored by Shannon Nelson's avatar Shannon Nelson Committed by Jeff Kirsher
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i40e: support for suspend and resume 



Add basic support for handling suspend and resume.  We'll add
Wake-on-LAN support later.

Change-Id: Iea5e11c81bd9289a5bdbf086de8f626911a0b5ce
Signed-off-by: default avatarShannon Nelson <shannon.nelson@intel.com>
Signed-off-by: default avatarJesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: default avatarKavindya Deegala <kavindya.s.deegala@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 23326186

drivers/net/ethernet/intel/i40e/i40e.h

+1 −0
Original line number Diff line number Diff line
@@ -133,6 +133,7 @@ enum i40e_state_t { 
	__I40E_GLOBAL_RESET_REQUESTED,

	__I40E_EMP_RESET_REQUESTED,

	__I40E_FILTER_OVERFLOW_PROMISC,

	__I40E_SUSPENDED,

};



enum i40e_interrupt_policy {

drivers/net/ethernet/intel/i40e/i40e_main.c

+96 −1
Original line number Diff line number Diff line
@@ -7749,7 +7749,11 @@ static pci_ers_result_t i40e_pci_error_detected(struct pci_dev *pdev, 
	dev_info(&pdev->dev, "%s: error %d\n", __func__, error);



	/* shutdown all operations */

	i40e_pf_quiesce_all_vsi(pf);

	if (!test_bit(__I40E_SUSPENDED, &pf->state)) {

		rtnl_lock();

		i40e_prep_for_reset(pf);

		rtnl_unlock();

	}



	/* Request a slot reset */

	return PCI_ERS_RESULT_NEED_RESET;
@@ -7812,9 +7816,95 @@ static void i40e_pci_error_resume(struct pci_dev *pdev) 
	struct i40e_pf *pf = pci_get_drvdata(pdev);



	dev_info(&pdev->dev, "%s\n", __func__);

	if (test_bit(__I40E_SUSPENDED, &pf->state))

		return;



	rtnl_lock();

	i40e_handle_reset_warning(pf);

	rtnl_lock();

}



/**

 * i40e_shutdown - PCI callback for shutting down

 * @pdev: PCI device information struct

 **/

static void i40e_shutdown(struct pci_dev *pdev)

{

	struct i40e_pf *pf = pci_get_drvdata(pdev);



	set_bit(__I40E_SUSPENDED, &pf->state);

	set_bit(__I40E_DOWN, &pf->state);

	rtnl_lock();

	i40e_prep_for_reset(pf);

	rtnl_unlock();



	if (system_state == SYSTEM_POWER_OFF) {

		pci_wake_from_d3(pdev, false);    /* No WoL support yet */

		pci_set_power_state(pdev, PCI_D3hot);

	}

}



#ifdef CONFIG_PM

/**

 * i40e_suspend - PCI callback for moving to D3

 * @pdev: PCI device information struct

 **/

static int i40e_suspend(struct pci_dev *pdev, pm_message_t state)

{

	struct i40e_pf *pf = pci_get_drvdata(pdev);



	set_bit(__I40E_SUSPENDED, &pf->state);

	set_bit(__I40E_DOWN, &pf->state);

	rtnl_lock();

	i40e_prep_for_reset(pf);

	rtnl_unlock();



	pci_wake_from_d3(pdev, false);    /* No WoL support yet */

	pci_set_power_state(pdev, PCI_D3hot);



	return 0;

}



/**

 * i40e_resume - PCI callback for waking up from D3

 * @pdev: PCI device information struct

 **/

static int i40e_resume(struct pci_dev *pdev)

{

	struct i40e_pf *pf = pci_get_drvdata(pdev);

	u32 err;



	pci_set_power_state(pdev, PCI_D0);

	pci_restore_state(pdev);

	/* pci_restore_state() clears dev->state_saves, so

	 * call pci_save_state() again to restore it.

	 */

	pci_save_state(pdev);



	err = pci_enable_device_mem(pdev);

	if (err) {

		dev_err(&pdev->dev,

			"%s: Cannot enable PCI device from suspend\n",

			__func__);

		return err;

	}

	pci_set_master(pdev);



	/* no wakeup events while running */

	pci_wake_from_d3(pdev, false);



	/* handling the reset will rebuild the device state */

	if (test_and_clear_bit(__I40E_SUSPENDED, &pf->state)) {

		clear_bit(__I40E_DOWN, &pf->state);

		rtnl_lock();

		i40e_reset_and_rebuild(pf, false);

		rtnl_unlock();

	}



	return 0;

}



#endif

static const struct pci_error_handlers i40e_err_handler = {

	.error_detected = i40e_pci_error_detected,

	.slot_reset = i40e_pci_error_slot_reset,
@@ -7826,6 +7916,11 @@ static struct pci_driver i40e_driver = { 
	.id_table = i40e_pci_tbl,

	.probe    = i40e_probe,

	.remove   = i40e_remove,

#ifdef CONFIG_PM

	.suspend  = i40e_suspend,

	.resume   = i40e_resume,

#endif

	.shutdown = i40e_shutdown,

	.err_handler = &i40e_err_handler,

	.sriov_configure = i40e_pci_sriov_configure,

};