[Linux-kernel-mentees] [PATCH v1 0/5] ethernet: intel: Convert to generic power management

[Linux-kernel-mentees] [PATCH v1 0/5] ethernet: intel: Convert to generic power management

[Vaibhav Gupta]

Linux Kernel Mentee: Remove Legacy Power Management.

The purpose of this patch series is to remove legacy power management callbacks
from amd ethernet drivers.

The callbacks performing suspend() and resume() operations are still calling
pci_save_state(), pci_set_power_state(), etc. and handling the power management
themselves, which is not recommended.

The conversion requires the removal of the those function calls and change the
callback definition accordingly and make use of dev_pm_ops structure.

All patches are compile-tested only.

Vaibhav Gupta (5):
  iavf: use generic power management
  igbvf: netdev: use generic power management
  ixgbe: use generic power management
  ixgbevf: use generic power management
  e100: use generic power management

 drivers/net/ethernet/intel/e100.c             | 31 ++++------
 drivers/net/ethernet/intel/iavf/iavf_main.c   | 45 ++++----------
 drivers/net/ethernet/intel/igbvf/netdev.c     | 37 +++--------
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 61 +++++--------------
 .../net/ethernet/intel/ixgbevf/ixgbevf_main.c | 44 +++----------
 5 files changed, 58 insertions(+), 160 deletions(-)

-- 
2.27.0

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[Linux-kernel-mentees] [PATCH v1 1/5] iavf: use generic power management

[Vaibhav Gupta]

With the support of generic PM callbacks, drivers no longer need to use
legacy .suspend() and .resume() in which they had to maintain PCI states
changes and device's power state themselves. The required operations are
done by PCI core.

PCI drivers are not expected to invoke PCI helper functions like
pci_save/restore_state(), pci_enable/disable_device(),
pci_set_power_state(), etc. Their tasks are completed by PCI core itself.

Compile-tested only.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
---
 drivers/net/ethernet/intel/iavf/iavf_main.c | 45 ++++++---------------
 1 file changed, 12 insertions(+), 33 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index fa82768e5eda..93fa0884ca69 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -3772,7 +3772,6 @@ static int iavf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	return err;
 }
 
-#ifdef CONFIG_PM
 /**
  * iavf_suspend - Power management suspend routine
  * @pdev: PCI device information struct
@@ -3780,11 +3779,10 @@ static int iavf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
  *
  * Called when the system (VM) is entering sleep/suspend.
  **/
-static int iavf_suspend(struct pci_dev *pdev, pm_message_t state)
+static int __maybe_unused iavf_suspend(struct device *dev_d)
 {
-	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct net_device *netdev = dev_get_drvdata(dev_d);
 	struct iavf_adapter *adapter = netdev_priv(netdev);
-	int retval = 0;
 
 	netif_device_detach(netdev);
 
@@ -3802,12 +3800,6 @@ static int iavf_suspend(struct pci_dev *pdev, pm_message_t state)
 
 	clear_bit(__IAVF_IN_CRITICAL_TASK, &adapter->crit_section);
 
-	retval = pci_save_state(pdev);
-	if (retval)
-		return retval;
-
-	pci_disable_device(pdev);
-
 	return 0;
 }
 
@@ -3817,24 +3809,13 @@ static int iavf_suspend(struct pci_dev *pdev, pm_message_t state)
  *
  * Called when the system (VM) is resumed from sleep/suspend.
  **/
-static int iavf_resume(struct pci_dev *pdev)
+static int __maybe_unused iavf_resume(struct device *dev_d)
 {
+	struct pci_dev *pdev = to_pci_dev(dev_d);
 	struct iavf_adapter *adapter = pci_get_drvdata(pdev);
 	struct net_device *netdev = adapter->netdev;
 	u32 err;
 
-	pci_set_power_state(pdev, PCI_D0);
-	pci_restore_state(pdev);
-	/* pci_restore_state clears dev->state_saved so call
-	 * pci_save_state to restore it.
-	 */
-	pci_save_state(pdev);
-
-	err = pci_enable_device_mem(pdev);
-	if (err) {
-		dev_err(&pdev->dev, "Cannot enable PCI device from suspend.\n");
-		return err;
-	}
 	pci_set_master(pdev);
 
 	rtnl_lock();
@@ -3858,7 +3839,6 @@ static int iavf_resume(struct pci_dev *pdev)
 	return err;
 }
 
-#endif /* CONFIG_PM */
 /**
  * iavf_remove - Device Removal Routine
  * @pdev: PCI device information struct
@@ -3960,16 +3940,15 @@ static void iavf_remove(struct pci_dev *pdev)
 	pci_disable_device(pdev);
 }
 
+static SIMPLE_DEV_PM_OPS(iavf_pm_ops, iavf_suspend, iavf_resume);
+
 static struct pci_driver iavf_driver = {
-	.name     = iavf_driver_name,
-	.id_table = iavf_pci_tbl,
-	.probe    = iavf_probe,
-	.remove   = iavf_remove,
-#ifdef CONFIG_PM
-	.suspend  = iavf_suspend,
-	.resume   = iavf_resume,
-#endif
-	.shutdown = iavf_shutdown,
+	.name      = iavf_driver_name,
+	.id_table  = iavf_pci_tbl,
+	.probe     = iavf_probe,
+	.remove    = iavf_remove,
+	.driver.pm = &iavf_pm_ops,
+	.shutdown  = iavf_shutdown,
 };
 
 /**
-- 
2.27.0

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[Linux-kernel-mentees] [PATCH v1 2/5] igbvf: netdev: use generic power management

[Vaibhav Gupta]

Remove legacy PM callbacks and use generic operations. With legacy code,
drivers were responsible for handling PCI PM operations like
pci_save_state(). In generic code, all these hre andled by PCI core.

The generic suspend() and resume() are called at the same point the legacy
ones were called. Thus, it does not affect the normal functioning of the
driver.

__maybe_unused attribute is used with .resume() but not with .suspend(), as
.suspend() is calleb by .shutdown().

Compile-tested only.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
---
 drivers/net/ethernet/intel/igbvf/netdev.c | 37 +++++------------------
 1 file changed, 8 insertions(+), 29 deletions(-)

diff --git a/drivers/net/ethernet/intel/igbvf/netdev.c b/drivers/net/ethernet/intel/igbvf/netdev.c
index 5b1800c3ba82..76285724b1f3 100644
--- a/drivers/net/ethernet/intel/igbvf/netdev.c
+++ b/drivers/net/ethernet/intel/igbvf/netdev.c
@@ -2459,13 +2459,10 @@ static int igbvf_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
 	}
 }
 
-static int igbvf_suspend(struct pci_dev *pdev, pm_message_t state)
+static int igbvf_suspend(struct device *dev_d)
 {
-	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct net_device *netdev = dev_get_drvdata(dev_d);
 	struct igbvf_adapter *adapter = netdev_priv(netdev);
-#ifdef CONFIG_PM
-	int retval = 0;
-#endif
 
 	netif_device_detach(netdev);
 
@@ -2475,31 +2472,16 @@ static int igbvf_suspend(struct pci_dev *pdev, pm_message_t state)
 		igbvf_free_irq(adapter);
 	}
 
-#ifdef CONFIG_PM
-	retval = pci_save_state(pdev);
-	if (retval)
-		return retval;
-#endif
-
-	pci_disable_device(pdev);
-
 	return 0;
 }
 
-#ifdef CONFIG_PM
-static int igbvf_resume(struct pci_dev *pdev)
+static int __maybe_unused igbvf_resume(struct device *dev_d)
 {
+	struct pci_dev *pdev = to_pci_dev(dev_d);
 	struct net_device *netdev = pci_get_drvdata(pdev);
 	struct igbvf_adapter *adapter = netdev_priv(netdev);
 	u32 err;
 
-	pci_restore_state(pdev);
-	err = pci_enable_device_mem(pdev);
-	if (err) {
-		dev_err(&pdev->dev, "Cannot enable PCI device from suspend\n");
-		return err;
-	}
-
 	pci_set_master(pdev);
 
 	if (netif_running(netdev)) {
@@ -2517,11 +2499,10 @@ static int igbvf_resume(struct pci_dev *pdev)
 
 	return 0;
 }
-#endif
 
 static void igbvf_shutdown(struct pci_dev *pdev)
 {
-	igbvf_suspend(pdev, PMSG_SUSPEND);
+	igbvf_suspend(&pdev->dev);
 }
 
 #ifdef CONFIG_NET_POLL_CONTROLLER
@@ -2962,17 +2943,15 @@ static const struct pci_device_id igbvf_pci_tbl[] = {
 };
 MODULE_DEVICE_TABLE(pci, igbvf_pci_tbl);
 
+static SIMPLE_DEV_PM_OPS(igbvf_pm_ops, igbvf_suspend, igbvf_resume);
+
 /* PCI Device API Driver */
 static struct pci_driver igbvf_driver = {
 	.name		= igbvf_driver_name,
 	.id_table	= igbvf_pci_tbl,
 	.probe		= igbvf_probe,
 	.remove		= igbvf_remove,
-#ifdef CONFIG_PM
-	/* Power Management Hooks */
-	.suspend	= igbvf_suspend,
-	.resume		= igbvf_resume,
-#endif
+	.driver.pm	= &igbvf_pm_ops,
 	.shutdown	= igbvf_shutdown,
 	.err_handler	= &igbvf_err_handler
 };
-- 
2.27.0

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[Linux-kernel-mentees] [PATCH v1 3/5] ixgbe: use generic power management

[Vaibhav Gupta]

With legacy PM hooks, it was the responsibility of a driver to manage PCI
states and also the device's power state. The generic approach is to let
PCI core handle the work.

ixgbe_suspend() calls __ixgbe_shutdown() to perform intermediate tasks.
__ixgbe_shutdown() modifies the value of "wake" (device should be wakeup
enabled or not), responsible for controlling the flow of legacy PM.

Since, PCI core has no idea about the value of "wake", new code for generic
PM may produce unexpected results. Thus, use "device_set_wakeup_enable()"
to wakeup-enable the device accordingly.

Compile-tested only.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 61 +++++--------------
 1 file changed, 15 insertions(+), 46 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 97a423ecf808..145296825e64 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -6861,32 +6861,20 @@ int ixgbe_close(struct net_device *netdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM
-static int ixgbe_resume(struct pci_dev *pdev)
+static int __maybe_unused ixgbe_resume(struct device *dev_d)
 {
+	struct pci_dev *pdev = to_pci_dev(dev_d);
 	struct ixgbe_adapter *adapter = pci_get_drvdata(pdev);
 	struct net_device *netdev = adapter->netdev;
 	u32 err;
 
 	adapter->hw.hw_addr = adapter->io_addr;
-	pci_set_power_state(pdev, PCI_D0);
-	pci_restore_state(pdev);
-	/*
-	 * pci_restore_state clears dev->state_saved so call
-	 * pci_save_state to restore it.
-	 */
-	pci_save_state(pdev);
 
-	err = pci_enable_device_mem(pdev);
-	if (err) {
-		e_dev_err("Cannot enable PCI device from suspend\n");
-		return err;
-	}
 	smp_mb__before_atomic();
 	clear_bit(__IXGBE_DISABLED, &adapter->state);
 	pci_set_master(pdev);
 
-	pci_wake_from_d3(pdev, false);
+	device_wakeup_disable(dev_d);
 
 	ixgbe_reset(adapter);
 
@@ -6904,7 +6892,6 @@ static int ixgbe_resume(struct pci_dev *pdev)
 
 	return err;
 }
-#endif /* CONFIG_PM */
 
 static int __ixgbe_shutdown(struct pci_dev *pdev, bool *enable_wake)
 {
@@ -6913,9 +6900,6 @@ static int __ixgbe_shutdown(struct pci_dev *pdev, bool *enable_wake)
 	struct ixgbe_hw *hw = &adapter->hw;
 	u32 ctrl;
 	u32 wufc = adapter->wol;
-#ifdef CONFIG_PM
-	int retval = 0;
-#endif
 
 	rtnl_lock();
 	netif_device_detach(netdev);
@@ -6926,12 +6910,6 @@ static int __ixgbe_shutdown(struct pci_dev *pdev, bool *enable_wake)
 	ixgbe_clear_interrupt_scheme(adapter);
 	rtnl_unlock();
 
-#ifdef CONFIG_PM
-	retval = pci_save_state(pdev);
-	if (retval)
-		return retval;
-
-#endif
 	if (hw->mac.ops.stop_link_on_d3)
 		hw->mac.ops.stop_link_on_d3(hw);
 
@@ -6986,26 +6964,18 @@ static int __ixgbe_shutdown(struct pci_dev *pdev, bool *enable_wake)
 	return 0;
 }
 
-#ifdef CONFIG_PM
-static int ixgbe_suspend(struct pci_dev *pdev, pm_message_t state)
+static int __maybe_unused ixgbe_suspend(struct device *dev_d)
 {
+	struct pci_dev *pdev = to_pci_dev(dev_d);
 	int retval;
 	bool wake;
 
 	retval = __ixgbe_shutdown(pdev, &wake);
-	if (retval)
-		return retval;
 
-	if (wake) {
-		pci_prepare_to_sleep(pdev);
-	} else {
-		pci_wake_from_d3(pdev, false);
-		pci_set_power_state(pdev, PCI_D3hot);
-	}
+	device_set_wakeup_enable(dev_d, wake);
 
-	return 0;
+	return retval;
 }
-#endif /* CONFIG_PM */
 
 static void ixgbe_shutdown(struct pci_dev *pdev)
 {
@@ -11489,16 +11459,15 @@ static const struct pci_error_handlers ixgbe_err_handler = {
 	.resume = ixgbe_io_resume,
 };
 
+static SIMPLE_DEV_PM_OPS(ixgbe_pm_ops, ixgbe_suspend, ixgbe_resume);
+
 static struct pci_driver ixgbe_driver = {
-	.name     = ixgbe_driver_name,
-	.id_table = ixgbe_pci_tbl,
-	.probe    = ixgbe_probe,
-	.remove   = ixgbe_remove,
-#ifdef CONFIG_PM
-	.suspend  = ixgbe_suspend,
-	.resume   = ixgbe_resume,
-#endif
-	.shutdown = ixgbe_shutdown,
+	.name      = ixgbe_driver_name,
+	.id_table  = ixgbe_pci_tbl,
+	.probe     = ixgbe_probe,
+	.remove    = ixgbe_remove,
+	.driver.pm = &ixgbe_pm_ops,
+	.shutdown  = ixgbe_shutdown,
 	.sriov_configure = ixgbe_pci_sriov_configure,
 	.err_handler = &ixgbe_err_handler
 };
-- 
2.27.0

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[Linux-kernel-mentees] [PATCH v1 4/5] ixgbevf: use generic power management

[Vaibhav Gupta]

With legacy PM, drivers themselves were responsible for managing the
device's power states and takes care of register states.

After upgrading to the generic structure, PCI core will take care of
required tasks and drivers should do only device-specific operations.

The driver was invoking PCI helper functions like pci_save/restore_state(),
and pci_enable/disable_device(), which is not recommended.

Compile-tested only.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
---
 .../net/ethernet/intel/ixgbevf/ixgbevf_main.c | 44 +++++--------------
 1 file changed, 10 insertions(+), 34 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index a39e2cb384dd..988345aeae4a 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -4300,13 +4300,10 @@ static int ixgbevf_change_mtu(struct net_device *netdev, int new_mtu)
 	return 0;
 }
 
-static int ixgbevf_suspend(struct pci_dev *pdev, pm_message_t state)
+static int __maybe_unused ixgbevf_suspend(struct device *dev_d)
 {
-	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct net_device *netdev = dev_get_drvdata(dev_d);
 	struct ixgbevf_adapter *adapter = netdev_priv(netdev);
-#ifdef CONFIG_PM
-	int retval = 0;
-#endif
 
 	rtnl_lock();
 	netif_device_detach(netdev);
@@ -4317,37 +4314,16 @@ static int ixgbevf_suspend(struct pci_dev *pdev, pm_message_t state)
 	ixgbevf_clear_interrupt_scheme(adapter);
 	rtnl_unlock();
 
-#ifdef CONFIG_PM
-	retval = pci_save_state(pdev);
-	if (retval)
-		return retval;
-
-#endif
-	if (!test_and_set_bit(__IXGBEVF_DISABLED, &adapter->state))
-		pci_disable_device(pdev);
-
 	return 0;
 }
 
-#ifdef CONFIG_PM
-static int ixgbevf_resume(struct pci_dev *pdev)
+static int __maybe_unused ixgbevf_resume(struct device *dev_d)
 {
+	struct pci_dev *pdev = to_pci_dev(dev_d);
 	struct net_device *netdev = pci_get_drvdata(pdev);
 	struct ixgbevf_adapter *adapter = netdev_priv(netdev);
 	u32 err;
 
-	pci_restore_state(pdev);
-	/* pci_restore_state clears dev->state_saved so call
-	 * pci_save_state to restore it.
-	 */
-	pci_save_state(pdev);
-
-	err = pci_enable_device_mem(pdev);
-	if (err) {
-		dev_err(&pdev->dev, "Cannot enable PCI device from suspend\n");
-		return err;
-	}
-
 	adapter->hw.hw_addr = adapter->io_addr;
 	smp_mb__before_atomic();
 	clear_bit(__IXGBEVF_DISABLED, &adapter->state);
@@ -4368,10 +4344,9 @@ static int ixgbevf_resume(struct pci_dev *pdev)
 	return err;
 }
 
-#endif /* CONFIG_PM */
 static void ixgbevf_shutdown(struct pci_dev *pdev)
 {
-	ixgbevf_suspend(pdev, PMSG_SUSPEND);
+	ixgbevf_suspend(&pdev->dev);
 }
 
 static void ixgbevf_get_tx_ring_stats(struct rtnl_link_stats64 *stats,
@@ -4891,16 +4866,17 @@ static const struct pci_error_handlers ixgbevf_err_handler = {
 	.resume = ixgbevf_io_resume,
 };
 
+static SIMPLE_DEV_PM_OPS(ixgbevf_pm_ops, ixgbevf_suspend, ixgbevf_resume);
+
 static struct pci_driver ixgbevf_driver = {
 	.name		= ixgbevf_driver_name,
 	.id_table	= ixgbevf_pci_tbl,
 	.probe		= ixgbevf_probe,
 	.remove		= ixgbevf_remove,
-#ifdef CONFIG_PM
+
 	/* Power Management Hooks */
-	.suspend	= ixgbevf_suspend,
-	.resume		= ixgbevf_resume,
-#endif
+	.driver.pm	= &ixgbevf_pm_ops,
+
 	.shutdown	= ixgbevf_shutdown,
 	.err_handler	= &ixgbevf_err_handler
 };
-- 
2.27.0

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[Linux-kernel-mentees] [PATCH v1 5/5] e100: use generic power management

[Vaibhav Gupta]

With legacy PM hooks, it was the responsibility of a driver to manage PCI
states and also the device's power state. The generic approach is to let
PCI core handle the work.

e100_suspend() calls __e100_shutdown() to perform intermediate tasks.
__e100_shutdown() calls pci_save_state() which is not recommended.

e100_suspend() also calls __e100_power_off() which is calling PCI helper
functions, pci_prepare_to_sleep(), pci_set_power_state(), along with
pci_wake_from_d3(...,false). Hence, the functin call is removed and wol is
disabled as earlier using device_wakeup_disable().

Compile-tested only.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
---
 drivers/net/ethernet/intel/e100.c | 31 +++++++++++++------------------
 1 file changed, 13 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ethernet/intel/e100.c b/drivers/net/ethernet/intel/e100.c
index 1b8d015ebfb0..7506fb5eca8f 100644
--- a/drivers/net/ethernet/intel/e100.c
+++ b/drivers/net/ethernet/intel/e100.c
@@ -2997,8 +2997,6 @@ static void __e100_shutdown(struct pci_dev *pdev, bool *enable_wake)
 		e100_down(nic);
 	netif_device_detach(netdev);
 
-	pci_save_state(pdev);
-
 	if ((nic->flags & wol_magic) | e100_asf(nic)) {
 		/* enable reverse auto-negotiation */
 		if (nic->phy == phy_82552_v) {
@@ -3028,24 +3026,21 @@ static int __e100_power_off(struct pci_dev *pdev, bool wake)
 	return 0;
 }
 
-#ifdef CONFIG_PM
-static int e100_suspend(struct pci_dev *pdev, pm_message_t state)
+static int __maybe_unused e100_suspend(struct device *dev_d)
 {
 	bool wake;
-	__e100_shutdown(pdev, &wake);
-	return __e100_power_off(pdev, wake);
+	__e100_shutdown(to_pci_dev(dev_d), &wake);
+
+	device_wakeup_disable(dev_d);
+
+	return 0;
 }
 
-static int e100_resume(struct pci_dev *pdev)
+static int __maybe_unused e100_resume(struct device *dev_d)
 {
-	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct net_device *netdev = dev_get_drvdata(dev_d);
 	struct nic *nic = netdev_priv(netdev);
 
-	pci_set_power_state(pdev, PCI_D0);
-	pci_restore_state(pdev);
-	/* ack any pending wake events, disable PME */
-	pci_enable_wake(pdev, PCI_D0, 0);
-
 	/* disable reverse auto-negotiation */
 	if (nic->phy == phy_82552_v) {
 		u16 smartspeed = mdio_read(netdev, nic->mii.phy_id,
@@ -3062,7 +3057,6 @@ static int e100_resume(struct pci_dev *pdev)
 
 	return 0;
 }
-#endif /* CONFIG_PM */
 
 static void e100_shutdown(struct pci_dev *pdev)
 {
@@ -3150,16 +3144,17 @@ static const struct pci_error_handlers e100_err_handler = {
 	.resume = e100_io_resume,
 };
 
+static SIMPLE_DEV_PM_OPS(e100_pm_ops, e100_suspend, e100_resume);
+
 static struct pci_driver e100_driver = {
 	.name =         DRV_NAME,
 	.id_table =     e100_id_table,
 	.probe =        e100_probe,
 	.remove =       e100_remove,
-#ifdef CONFIG_PM
+
 	/* Power Management hooks */
-	.suspend =      e100_suspend,
-	.resume =       e100_resume,
-#endif
+	.driver.pm =	&e100_pm_ops,
+
 	.shutdown =     e100_shutdown,
 	.err_handler = &e100_err_handler,
 };
-- 
2.27.0

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Re: [Linux-kernel-mentees] [Intel-wired-lan] [PATCH v1 2/5] igbvf: netdev: use generic power management

[Brown, Aaron F]

> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
> Vaibhav Gupta
> Sent: Monday, June 29, 2020 2:30 AM
> To: Bjorn Helgaas <helgaas@kernel.org>; Bjorn Helgaas
> <bhelgaas@google.com>; bjorn@helgaas.com; Vaibhav Gupta
> <vaibhav.varodek@gmail.com>; David S. Miller <davem@davemloft.net>;
> Jakub Kicinski <kuba@kernel.org>; Kirsher, Jeffrey T
> <jeffrey.t.kirsher@intel.com>
> Cc: Vaibhav Gupta <vaibhavgupta40@gmail.com>; netdev@vger.kernel.org;
> linux-kernel@vger.kernel.org; intel-wired-lan@lists.osuosl.org;
> skhan@linuxfoundation.org; linux-kernel-mentees@lists.linuxfoundation.org
> Subject: [Intel-wired-lan] [PATCH v1 2/5] igbvf: netdev: use generic power
> management
> 
> Remove legacy PM callbacks and use generic operations. With legacy code,
> drivers were responsible for handling PCI PM operations like
> pci_save_state(). In generic code, all these hre andled by PCI core.
> 
> The generic suspend() and resume() are called at the same point the legacy
> ones were called. Thus, it does not affect the normal functioning of the
> driver.
> 
> __maybe_unused attribute is used with .resume() but not with .suspend(), as
> .suspend() is calleb by .shutdown().
> 
> Compile-tested only.
> 
> Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
> ---
>  drivers/net/ethernet/intel/igbvf/netdev.c | 37 +++++------------------
>  1 file changed, 8 insertions(+), 29 deletions(-)
> 

Tested-by: Aaron Brown <aaron.f.brown@intel.com>
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Re: [Linux-kernel-mentees] [Intel-wired-lan] [PATCH v1 5/5] e100: use generic power management

[Brown, Aaron F]

> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
> Vaibhav Gupta
> Sent: Monday, June 29, 2020 2:30 AM
> To: Bjorn Helgaas <helgaas@kernel.org>; Bjorn Helgaas
> <bhelgaas@google.com>; bjorn@helgaas.com; Vaibhav Gupta
> <vaibhav.varodek@gmail.com>; David S. Miller <davem@davemloft.net>;
> Jakub Kicinski <kuba@kernel.org>; Kirsher, Jeffrey T
> <jeffrey.t.kirsher@intel.com>
> Cc: Vaibhav Gupta <vaibhavgupta40@gmail.com>; netdev@vger.kernel.org;
> linux-kernel@vger.kernel.org; intel-wired-lan@lists.osuosl.org;
> skhan@linuxfoundation.org; linux-kernel-mentees@lists.linuxfoundation.org
> Subject: [Intel-wired-lan] [PATCH v1 5/5] e100: use generic power management
> 
> With legacy PM hooks, it was the responsibility of a driver to manage PCI
> states and also the device's power state. The generic approach is to let
> PCI core handle the work.
> 
> e100_suspend() calls __e100_shutdown() to perform intermediate tasks.
> __e100_shutdown() calls pci_save_state() which is not recommended.
> 
> e100_suspend() also calls __e100_power_off() which is calling PCI helper
> functions, pci_prepare_to_sleep(), pci_set_power_state(), along with
> pci_wake_from_d3(...,false). Hence, the functin call is removed and wol is
> disabled as earlier using device_wakeup_disable().
> 
> Compile-tested only.
> 
> Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
> ---
>  drivers/net/ethernet/intel/e100.c | 31 +++++++++++++------------------
>  1 file changed, 13 insertions(+), 18 deletions(-)

I do have several e100 based adapters still working and a few old systems with plain old PCI that still function, however all of these older systems have broken power management.  Regardless of if I use the kernel before or after this patch is applied, or even if the e100 driver is loaded or not I can't get a reliable suspend / resume cycle to work on them.

I did run some basic regression with this patch against the remaining pro100 cards I could scrounge up and aside from broken power management (again with or without patch) the system seems good, so (hesitantly) from a regression perspective I will go ahead and say...
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
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