Commit 78cd29d5 authored by Bruce Allan's avatar Bruce Allan Committed by Jeff Kirsher
Browse files

e1000e: If ASPM L0s needs to be disabled, do it prior to enabling device 



Based on a patch from Naga Chumbalkar <nagananda.chumbalkar@hp.com>:

If ASPM L0s needs to be disabled due to HW errata, do it prior to
"enabling" the device. This way if the kernel ever defaults its
aspm_policy to POLICY_POWERSAVE, then the e1000e driver will get a
chance to disable ASPM on the misbehaving device *prior* to calling
pci_enable_device_mem(). This will be useful in situations
where the BIOS indicates ASPM support on the server by clearing the
ACPI FADT "ASPM Controls" bit.

Note:
The kernel (2.6.38) currently uses the BIOS "default" as its aspm_policy.
However, Linux distros can diverge from that and set the default to
"powersave".

v2: o cleanup namespace pollution of e1000e_disable_aspm(),
    o fix type and initialization of the new aspm_disable_flag in a few
      functions, and
    o redefine FLAG2_DISABLE_ASPM_L0S to the first unused bit in
      adapter->flags2.

Signed-off-by: default avatarBruce Allan <bruce.w.allan@intel.com>
Cc: Naga Chumbalkar <nagananda.chumbalkar@hp.com>
Tested-by: default avatarAaron Brown <aaron.f.brown@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 2084b114

drivers/net/e1000e/82571.c

+5 −5
Original line number Diff line number Diff line
@@ -431,9 +431,6 @@ static s32 e1000_get_variants_82571(struct e1000_adapter *adapter) 
	case e1000_82573:

	case e1000_82574:

	case e1000_82583:

		/* Disable ASPM L0s due to hardware errata */

		e1000e_disable_aspm(adapter->pdev, PCIE_LINK_STATE_L0S);



		if (pdev->device == E1000_DEV_ID_82573L) {

			adapter->flags |= FLAG_HAS_JUMBO_FRAMES;

			adapter->max_hw_frame_size = DEFAULT_JUMBO;
@@ -2066,7 +2063,8 @@ struct e1000_info e1000_82573_info = { 
				  | FLAG_HAS_SMART_POWER_DOWN

				  | FLAG_HAS_AMT

				  | FLAG_HAS_SWSM_ON_LOAD,

	.flags2			= FLAG2_DISABLE_ASPM_L1,

	.flags2			= FLAG2_DISABLE_ASPM_L1

				  | FLAG2_DISABLE_ASPM_L0S,

	.pba			= 20,

	.max_hw_frame_size	= ETH_FRAME_LEN + ETH_FCS_LEN,

	.get_variants		= e1000_get_variants_82571,
@@ -2086,7 +2084,8 @@ struct e1000_info e1000_82574_info = { 
				  | FLAG_HAS_SMART_POWER_DOWN

				  | FLAG_HAS_AMT

				  | FLAG_HAS_CTRLEXT_ON_LOAD,

	.flags2			  = FLAG2_CHECK_PHY_HANG,

	.flags2			  = FLAG2_CHECK_PHY_HANG

				  | FLAG2_DISABLE_ASPM_L0S,

	.pba			= 32,

	.max_hw_frame_size	= DEFAULT_JUMBO,

	.get_variants		= e1000_get_variants_82571,
@@ -2104,6 +2103,7 @@ struct e1000_info e1000_82583_info = { 
				  | FLAG_HAS_SMART_POWER_DOWN

				  | FLAG_HAS_AMT

				  | FLAG_HAS_CTRLEXT_ON_LOAD,

	.flags2			= FLAG2_DISABLE_ASPM_L0S,

	.pba			= 32,

	.max_hw_frame_size	= ETH_FRAME_LEN + ETH_FCS_LEN,

	.get_variants		= e1000_get_variants_82571,

drivers/net/e1000e/e1000.h

+1 −1
Original line number Diff line number Diff line
@@ -458,6 +458,7 @@ struct e1000_info { 
#define FLAG2_HAS_PHY_STATS               (1 << 4)

#define FLAG2_HAS_EEE                     (1 << 5)

#define FLAG2_DMA_BURST                   (1 << 6)

#define FLAG2_DISABLE_ASPM_L0S            (1 << 7)

#define FLAG2_DISABLE_AIM                 (1 << 8)

#define FLAG2_CHECK_PHY_HANG              (1 << 9)
@@ -504,7 +505,6 @@ extern void e1000e_set_interrupt_capability(struct e1000_adapter *adapter); 
extern void e1000e_reset_interrupt_capability(struct e1000_adapter *adapter);

extern void e1000e_get_hw_control(struct e1000_adapter *adapter);

extern void e1000e_release_hw_control(struct e1000_adapter *adapter);

extern void e1000e_disable_aspm(struct pci_dev *pdev, u16 state);



extern unsigned int copybreak;

drivers/net/e1000e/netdev.c

+24 −5
Original line number Diff line number Diff line
@@ -58,6 +58,8 @@ 
char e1000e_driver_name[] = "e1000e";

const char e1000e_driver_version[] = DRV_VERSION;



static void e1000e_disable_aspm(struct pci_dev *pdev, u16 state);



static const struct e1000_info *e1000_info_tbl[] = {

	[board_82571]		= &e1000_82571_info,

	[board_82572]		= &e1000_82572_info,
@@ -5384,7 +5386,7 @@ static void __e1000e_disable_aspm(struct pci_dev *pdev, u16 state) 
	pci_write_config_word(pdev->bus->self, pos + PCI_EXP_LNKCTL, reg16);

}

#endif

void e1000e_disable_aspm(struct pci_dev *pdev, u16 state)

static void e1000e_disable_aspm(struct pci_dev *pdev, u16 state)

{

	dev_info(&pdev->dev, "Disabling ASPM %s %s\n",

		 (state & PCIE_LINK_STATE_L0S) ? "L0s" : "",
@@ -5404,13 +5406,19 @@ static int __e1000_resume(struct pci_dev *pdev) 
	struct net_device *netdev = pci_get_drvdata(pdev);

	struct e1000_adapter *adapter = netdev_priv(netdev);

	struct e1000_hw *hw = &adapter->hw;

	u16 aspm_disable_flag = 0;

	u32 err;



	if (adapter->flags2 & FLAG2_DISABLE_ASPM_L0S)

		aspm_disable_flag = PCIE_LINK_STATE_L0S;

	if (adapter->flags2 & FLAG2_DISABLE_ASPM_L1)

		aspm_disable_flag |= PCIE_LINK_STATE_L1;

	if (aspm_disable_flag)

		e1000e_disable_aspm(pdev, aspm_disable_flag);



	pci_set_power_state(pdev, PCI_D0);

	pci_restore_state(pdev);

	pci_save_state(pdev);

	if (adapter->flags2 & FLAG2_DISABLE_ASPM_L1)

		e1000e_disable_aspm(pdev, PCIE_LINK_STATE_L1);



	e1000e_set_interrupt_capability(adapter);

	if (netif_running(netdev)) {
@@ -5654,11 +5662,17 @@ static pci_ers_result_t e1000_io_slot_reset(struct pci_dev *pdev) 
	struct net_device *netdev = pci_get_drvdata(pdev);

	struct e1000_adapter *adapter = netdev_priv(netdev);

	struct e1000_hw *hw = &adapter->hw;

	u16 aspm_disable_flag = 0;

	int err;

	pci_ers_result_t result;



	if (adapter->flags2 & FLAG2_DISABLE_ASPM_L0S)

		aspm_disable_flag = PCIE_LINK_STATE_L0S;

	if (adapter->flags2 & FLAG2_DISABLE_ASPM_L1)

		e1000e_disable_aspm(pdev, PCIE_LINK_STATE_L1);

		aspm_disable_flag |= PCIE_LINK_STATE_L1;

	if (aspm_disable_flag)

		e1000e_disable_aspm(pdev, aspm_disable_flag);



	err = pci_enable_device_mem(pdev);

	if (err) {

		dev_err(&pdev->dev,
@@ -5799,12 +5813,17 @@ static int __devinit e1000_probe(struct pci_dev *pdev, 
	resource_size_t flash_start, flash_len;



	static int cards_found;

	u16 aspm_disable_flag = 0;

	int i, err, pci_using_dac;

	u16 eeprom_data = 0;

	u16 eeprom_apme_mask = E1000_EEPROM_APME;



	if (ei->flags2 & FLAG2_DISABLE_ASPM_L0S)

		aspm_disable_flag = PCIE_LINK_STATE_L0S;

	if (ei->flags2 & FLAG2_DISABLE_ASPM_L1)

		e1000e_disable_aspm(pdev, PCIE_LINK_STATE_L1);

		aspm_disable_flag |= PCIE_LINK_STATE_L1;

	if (aspm_disable_flag)

		e1000e_disable_aspm(pdev, aspm_disable_flag);



	err = pci_enable_device_mem(pdev);

	if (err)

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