Revert "PCI: PCIE ASPM support"

This reverts commit 6c723d5bd89f03fc3ef627d50f89ade054d2ee3b.

It caused build errors on non-x86 platforms, config file confusion, and
even some boot errors on some x86-64 boxes.  All around, not quite ready
for prime-time :(

Cc: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 0 insertions, 825 deletions

diff --git a/drivers/pci/pcie/Kconfig b/drivers/pci/pcie/Kconfig
index 60104cf98796..287a9311716c 100644
--- a/drivers/pci/pcie/Kconfig
+++ b/drivers/pci/pcie/Kconfig
@@ -26,23 +26,3 @@ config HOTPLUG_PCI_PCIE
 	  When in doubt, say N.
 
 source "drivers/pci/pcie/aer/Kconfig"
-
-#
-# PCI Express ASPM
-#
-config PCIEASPM
-	bool "PCI Express ASPM support(Experimental)"
-	depends on PCI && EXPERIMENTAL
-	default y
-	help
-	  This enables PCI Express ASPM (Active State Power Management) and
-	  Clock Power Management. ASPM supports state L0/L0s/L1.
-
-	  When in doubt, say N.
-config PCIEASPM_DEBUG
-	bool "Debug PCI Express ASPM"
-	depends on PCIEASPM
-	default n
-	help
-	  This enables PCI Express ASPM debug support. It will add per-device
-	  interface to control ASPM.
diff --git a/drivers/pci/pcie/Makefile b/drivers/pci/pcie/Makefile
index 11f6bb1eae24..e00fb99acf44 100644
--- a/drivers/pci/pcie/Makefile
+++ b/drivers/pci/pcie/Makefile
@@ -2,9 +2,6 @@
 # Makefile for PCI-Express PORT Driver
 #
 
-# Build PCI Express ASPM if needed
-obj-$(CONFIG_PCIEASPM)		+= aspm.o
-
 pcieportdrv-y			:= portdrv_core.o portdrv_pci.o portdrv_bus.o
 
 obj-$(CONFIG_PCIEPORTBUS)	+= pcieportdrv.o
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
deleted file mode 100644
index 1a5adeb10c95..000000000000
--- a/drivers/pci/pcie/aspm.c
+++ /dev/null
@@ -1,802 +0,0 @@
-/*
- * File:	drivers/pci/pcie/aspm.c
- * Enabling PCIE link L0s/L1 state and Clock Power Management
- *
- * Copyright (C) 2007 Intel
- * Copyright (C) Zhang Yanmin (yanmin.zhang@intel.com)
- * Copyright (C) Shaohua Li (shaohua.li@intel.com)
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/pci.h>
-#include <linux/pci_regs.h>
-#include <linux/errno.h>
-#include <linux/pm.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/aspm.h>
-#include <acpi/acpi_bus.h>
-#include <linux/pci-acpi.h>
-#include "../pci.h"
-
-#ifdef MODULE_PARAM_PREFIX
-#undef MODULE_PARAM_PREFIX
-#endif
-#define MODULE_PARAM_PREFIX "pcie_aspm."
-
-struct endpoint_state {
-	unsigned int l0s_acceptable_latency;
-	unsigned int l1_acceptable_latency;
-};
-
-struct pcie_link_state {
-	struct list_head sibiling;
-	struct pci_dev *pdev;
-
-	/* ASPM state */
-	unsigned int support_state;
-	unsigned int enabled_state;
-	unsigned int bios_aspm_state;
-	/* upstream component */
-	unsigned int l0s_upper_latency;
-	unsigned int l1_upper_latency;
-	/* downstream component */
-	unsigned int l0s_down_latency;
-	unsigned int l1_down_latency;
-	/* Clock PM state*/
-	unsigned int clk_pm_capable;
-	unsigned int clk_pm_enabled;
-	unsigned int bios_clk_state;
-
-	/*
-	 * A pcie downstream port only has one slot under it, so at most there
-	 * are 8 functions
-	 */
-	struct endpoint_state endpoints[8];
-};
-
-static int aspm_disabled;
-static DEFINE_MUTEX(aspm_lock);
-static LIST_HEAD(link_list);
-
-#define POLICY_DEFAULT 0	/* BIOS default setting */
-#define POLICY_PERFORMANCE 1	/* high performance */
-#define POLICY_POWERSAVE 2	/* high power saving */
-static int aspm_policy;
-static const char *policy_str[] = {
-	[POLICY_DEFAULT] = "default",
-	[POLICY_PERFORMANCE] = "performance",
-	[POLICY_POWERSAVE] = "powersave"
-};
-
-static int policy_to_aspm_state(struct pci_dev *pdev)
-{
-	struct pcie_link_state *link_state = pdev->link_state;
-
-	switch (aspm_policy) {
-	case POLICY_PERFORMANCE:
-		/* Disable ASPM and Clock PM */
-		return 0;
-	case POLICY_POWERSAVE:
-		/* Enable ASPM L0s/L1 */
-		return PCIE_LINK_STATE_L0S|PCIE_LINK_STATE_L1;
-	case POLICY_DEFAULT:
-		return link_state->bios_aspm_state;
-	}
-	return 0;
-}
-
-static int policy_to_clkpm_state(struct pci_dev *pdev)
-{
-	struct pcie_link_state *link_state = pdev->link_state;
-
-	switch (aspm_policy) {
-	case POLICY_PERFORMANCE:
-		/* Disable ASPM and Clock PM */
-		return 0;
-	case POLICY_POWERSAVE:
-		/* Disable Clock PM */
-		return 1;
-	case POLICY_DEFAULT:
-		return link_state->bios_clk_state;
-	}
-	return 0;
-}
-
-static void pcie_set_clock_pm(struct pci_dev *pdev, int enable)
-{
-	struct pci_dev *child_dev;
-	int pos;
-	u16 reg16;
-	struct pcie_link_state *link_state = pdev->link_state;
-
-	list_for_each_entry(child_dev, &pdev->subordinate->devices, bus_list) {
-		pos = pci_find_capability(child_dev, PCI_CAP_ID_EXP);
-		if (!pos)
-			return;
-		pci_read_config_word(child_dev, pos + PCI_EXP_LNKCTL, &reg16);
-		if (enable)
-			reg16 |= PCI_EXP_LNKCTL_CLKREQ_EN;
-		else
-			reg16 &= ~PCI_EXP_LNKCTL_CLKREQ_EN;
-		pci_write_config_word(child_dev, pos + PCI_EXP_LNKCTL, reg16);
-	}
-	link_state->clk_pm_enabled = !!enable;
-}
-
-static void pcie_check_clock_pm(struct pci_dev *pdev)
-{
-	int pos;
-	u32 reg32;
-	u16 reg16;
-	int capable = 1, enabled = 1;
-	struct pci_dev *child_dev;
-	struct pcie_link_state *link_state = pdev->link_state;
-
-	/* All functions should have the same cap and state, take the worst */
-	list_for_each_entry(child_dev, &pdev->subordinate->devices, bus_list) {
-		pos = pci_find_capability(child_dev, PCI_CAP_ID_EXP);
-		if (!pos)
-			return;
-		pci_read_config_dword(child_dev, pos + PCI_EXP_LNKCAP, &reg32);
-		if (!(reg32 & PCI_EXP_LNKCAP_CLKPM)) {
-			capable = 0;
-			enabled = 0;
-			break;
-		}
-		pci_read_config_word(child_dev, pos + PCI_EXP_LNKCTL, &reg16);
-		if (!(reg16 & PCI_EXP_LNKCTL_CLKREQ_EN))
-			enabled = 0;
-	}
-	link_state->clk_pm_capable = capable;
-	link_state->clk_pm_enabled = enabled;
-	link_state->bios_clk_state = enabled;
-	pcie_set_clock_pm(pdev, policy_to_clkpm_state(pdev));
-}
-
-/*
- * pcie_aspm_configure_common_clock: check if the 2 ends of a link
- *   could use common clock. If they are, configure them to use the
- *   common clock. That will reduce the ASPM state exit latency.
- */
-static void pcie_aspm_configure_common_clock(struct pci_dev *pdev)
-{
-	int pos, child_pos;
-	u16 reg16 = 0;
-	struct pci_dev *child_dev;
-	int same_clock = 1;
-
-	/*
-	 * all functions of a slot should have the same Slot Clock
-	 * Configuration, so just check one function
-	 * */
-	child_dev = list_entry(pdev->subordinate->devices.next, struct pci_dev,
-		bus_list);
-	BUG_ON(!child_dev->is_pcie);
-
-	/* Check downstream component if bit Slot Clock Configuration is 1 */
-	child_pos = pci_find_capability(child_dev, PCI_CAP_ID_EXP);
-	pci_read_config_word(child_dev, child_pos + PCI_EXP_LNKSTA, &reg16);
-	if (!(reg16 & PCI_EXP_LNKSTA_SLC))
-		same_clock = 0;
-
-	/* Check upstream component if bit Slot Clock Configuration is 1 */
-	pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
-	pci_read_config_word(pdev, pos + PCI_EXP_LNKSTA, &reg16);
-	if (!(reg16 & PCI_EXP_LNKSTA_SLC))
-		same_clock = 0;
-
-	/* Configure downstream component, all functions */
-	list_for_each_entry(child_dev, &pdev->subordinate->devices, bus_list) {
-		child_pos = pci_find_capability(child_dev, PCI_CAP_ID_EXP);
-		pci_read_config_word(child_dev, child_pos + PCI_EXP_LNKCTL,
-			&reg16);
-		if (same_clock)
-			reg16 |= PCI_EXP_LNKCTL_CCC;
-		else
-			reg16 &= ~PCI_EXP_LNKCTL_CCC;
-		pci_write_config_word(child_dev, child_pos + PCI_EXP_LNKCTL,
-			reg16);
-	}
-
-	/* Configure upstream component */
-	pci_read_config_word(pdev, pos + PCI_EXP_LNKCTL, &reg16);
-	if (same_clock)
-		reg16 |= PCI_EXP_LNKCTL_CCC;
-	else
-		reg16 &= ~PCI_EXP_LNKCTL_CCC;
-	pci_write_config_word(pdev, pos + PCI_EXP_LNKCTL, reg16);
-
-	/* retrain link */
-	reg16 |= PCI_EXP_LNKCTL_RL;
-	pci_write_config_word(pdev, pos + PCI_EXP_LNKCTL, reg16);
-
-	/* Wait for link training end */
-	while (1) {
-		pci_read_config_word(pdev, pos + PCI_EXP_LNKSTA, &reg16);
-		if (!(reg16 & PCI_EXP_LNKSTA_LT))
-			break;
-		cpu_relax();
-	}
-}
-
-/*
- * calc_L0S_latency: Convert L0s latency encoding to ns
- */
-static unsigned int calc_L0S_latency(unsigned int latency_encoding, int ac)
-{
-	unsigned int ns = 64;
-
-	if (latency_encoding == 0x7) {
-		if (ac)
-			ns = -1U;
-		else
-			ns = 5*1000; /* > 4us */
-	} else
-		ns *= (1 << latency_encoding);
-	return ns;
-}
-
-/*
- * calc_L1_latency: Convert L1 latency encoding to ns
- */
-static unsigned int calc_L1_latency(unsigned int latency_encoding, int ac)
-{
-	unsigned int ns = 1000;
-
-	if (latency_encoding == 0x7) {
-		if (ac)
-			ns = -1U;
-		else
-			ns = 65*1000; /* > 64us */
-	} else
-		ns *= (1 << latency_encoding);
-	return ns;
-}
-
-static void pcie_aspm_get_cap_device(struct pci_dev *pdev, u32 *state,
-	unsigned int *l0s, unsigned int *l1, unsigned int *enabled)
-{
-	int pos;
-	u16 reg16;
-	u32 reg32;
-	unsigned int latency;
-
-	pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
-	pci_read_config_dword(pdev, pos + PCI_EXP_LNKCAP, &reg32);
-	*state = (reg32 & PCI_EXP_LNKCAP_ASPMS) >> 10;
-	if (*state != PCIE_LINK_STATE_L0S &&
-		*state != (PCIE_LINK_STATE_L1|PCIE_LINK_STATE_L0S))
-		* state = 0;
-	if (*state == 0)
-		return;
-
-	latency = (reg32 & PCI_EXP_LNKCAP_L0SEL) >> 12;
-	*l0s = calc_L0S_latency(latency, 0);
-	if (*state & PCIE_LINK_STATE_L1) {
-		latency = (reg32 & PCI_EXP_LNKCAP_L1EL) >> 15;
-		*l1 = calc_L1_latency(latency, 0);
-	}
-	pci_read_config_word(pdev, pos + PCI_EXP_LNKCTL, &reg16);
-	*enabled = reg16 & (PCIE_LINK_STATE_L0S|PCIE_LINK_STATE_L1);
-}
-
-static void pcie_aspm_cap_init(struct pci_dev *pdev)
-{
-	struct pci_dev *child_dev;
-	u32 state, tmp;
-	struct pcie_link_state *link_state = pdev->link_state;
-
-	/* upstream component states */
-	pcie_aspm_get_cap_device(pdev, &link_state->support_state,
-		&link_state->l0s_upper_latency,
-		&link_state->l1_upper_latency,
-		&link_state->enabled_state);
-	/* downstream component states, all functions have the same setting */
-	child_dev = list_entry(pdev->subordinate->devices.next, struct pci_dev,
-		bus_list);
-	pcie_aspm_get_cap_device(child_dev, &state,
-		&link_state->l0s_down_latency,
-		&link_state->l1_down_latency,
-		&tmp);
-	link_state->support_state &= state;
-	if (!link_state->support_state)
-		return;
-	link_state->enabled_state &= link_state->support_state;
-	link_state->bios_aspm_state = link_state->enabled_state;
-
-	/* ENDPOINT states*/
-	list_for_each_entry(child_dev, &pdev->subordinate->devices, bus_list) {
-		int pos;
-		u32 reg32;
-		unsigned int latency;
-		struct endpoint_state *ep_state =
-			&link_state->endpoints[PCI_FUNC(child_dev->devfn)];
-
-		if (child_dev->pcie_type != PCI_EXP_TYPE_ENDPOINT &&
-			child_dev->pcie_type != PCI_EXP_TYPE_LEG_END)
-			continue;
-
-		pos = pci_find_capability(child_dev, PCI_CAP_ID_EXP);
-		pci_read_config_dword(child_dev, pos + PCI_EXP_DEVCAP, &reg32);
-		latency = (reg32 & PCI_EXP_DEVCAP_L0S) >> 6;
-		latency = calc_L0S_latency(latency, 1);
-		ep_state->l0s_acceptable_latency = latency;
-		if (link_state->support_state & PCIE_LINK_STATE_L1) {
-			latency = (reg32 & PCI_EXP_DEVCAP_L1) >> 9;
-			latency = calc_L1_latency(latency, 1);
-			ep_state->l1_acceptable_latency = latency;
-		}
-	}
-}
-
-static unsigned int __pcie_aspm_check_state_one(struct pci_dev *pdev,
-	unsigned int state)
-{
-	struct pci_dev *parent_dev, *tmp_dev;
-	unsigned int latency, l1_latency = 0;
-	struct pcie_link_state *link_state;
-	struct endpoint_state *ep_state;
-
-	parent_dev = pdev->bus->self;
-	link_state = parent_dev->link_state;
-	state &= link_state->support_state;
-	if (state == 0)
-		return 0;
-	ep_state = &link_state->endpoints[PCI_FUNC(pdev->devfn)];
-
-	/*
-	 * Check latency for endpoint device.
-	 * TBD: The latency from the endpoint to root complex vary per
-	 * switch's upstream link state above the device. Here we just do a
-	 * simple check which assumes all links above the device can be in L1
-	 * state, that is we just consider the worst case. If switch's upstream
-	 * link can't be put into L0S/L1, then our check is too strictly.
-	 */
-	tmp_dev = pdev;
-	while (state & (PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1)) {
-		parent_dev = tmp_dev->bus->self;
-		link_state = parent_dev->link_state;
-		if (state & PCIE_LINK_STATE_L0S) {
-			latency = max_t(unsigned int,
-					link_state->l0s_upper_latency,
-					link_state->l0s_down_latency);
-			if (latency > ep_state->l0s_acceptable_latency)
-				state &= ~PCIE_LINK_STATE_L0S;
-		}
-		if (state & PCIE_LINK_STATE_L1) {
-			latency = max_t(unsigned int,
-					link_state->l1_upper_latency,
-					link_state->l1_down_latency);
-			if (latency + l1_latency >
-					ep_state->l1_acceptable_latency)
-				state &= ~PCIE_LINK_STATE_L1;
-		}
-		if (!parent_dev->bus->self) /* parent_dev is a root port */
-			break;
-		else {
-			/*
-			 * parent_dev is the downstream port of a switch, make
-			 * tmp_dev the upstream port of the switch
-			 */
-			tmp_dev = parent_dev->bus->self;
-			/*
-			 * every switch on the path to root complex need 1 more
-			 * microsecond for L1. Spec doesn't mention L0S.
-			 */
-			if (state & PCIE_LINK_STATE_L1)
-				l1_latency += 1000;
-		}
-	}
-	return state;
-}
-
-static unsigned int pcie_aspm_check_state(struct pci_dev *pdev,
-	unsigned int state)
-{
-	struct pci_dev *child_dev;
-
-	/* If no child, disable the link */
-	if (list_empty(&pdev->subordinate->devices))
-		return 0;
-	list_for_each_entry(child_dev, &pdev->subordinate->devices, bus_list) {
-		if (child_dev->pcie_type == PCI_EXP_TYPE_PCI_BRIDGE) {
-			/*
-			 * If downstream component of a link is pci bridge, we
-			 * disable ASPM for now for the link
-			 * */
-			state = 0;
-			break;
-		}
-		if ((child_dev->pcie_type != PCI_EXP_TYPE_ENDPOINT &&
-			child_dev->pcie_type != PCI_EXP_TYPE_LEG_END))
-			continue;
-		/* Device not in D0 doesn't need check latency */
-		if (child_dev->current_state == PCI_D1 ||
-			child_dev->current_state == PCI_D2 ||
-			child_dev->current_state == PCI_D3hot ||
-			child_dev->current_state == PCI_D3cold)
-			continue;
-		state = __pcie_aspm_check_state_one(child_dev, state);
-	}
-	return state;
-}
-
-static void __pcie_aspm_config_one_dev(struct pci_dev *pdev, unsigned int state)
-{
-	u16 reg16;
-	int pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
-
-	pci_read_config_word(pdev, pos + PCI_EXP_LNKCTL, &reg16);
-	reg16 &= ~0x3;
-	reg16 |= state;
-	pci_write_config_word(pdev, pos + PCI_EXP_LNKCTL, reg16);
-}
-
-static void __pcie_aspm_config_link(struct pci_dev *pdev, unsigned int state)
-{
-	struct pci_dev *child_dev;
-	int valid = 1;
-	struct pcie_link_state *link_state = pdev->link_state;
-
-	/*
-	 * if the downstream component has pci bridge function, don't do ASPM
-	 * now
-	 */
-	list_for_each_entry(child_dev, &pdev->subordinate->devices, bus_list) {
-		if (child_dev->pcie_type == PCI_EXP_TYPE_PCI_BRIDGE) {
-			valid = 0;
-			break;
-		}
-	}
-	if (!valid)
-		return;
-
-	/*
-	 * spec 2.0 suggests all functions should be configured the same
-	 * setting for ASPM. Enabling ASPM L1 should be done in upstream
-	 * component first and then downstream, and vice versa for disabling
-	 * ASPM L1. Spec doesn't mention L0S.
-	 */
-	if (state & PCIE_LINK_STATE_L1)
-		__pcie_aspm_config_one_dev(pdev, state);
-
-	list_for_each_entry(child_dev, &pdev->subordinate->devices, bus_list)
-		__pcie_aspm_config_one_dev(child_dev, state);
-
-	if (!(state & PCIE_LINK_STATE_L1))
-		__pcie_aspm_config_one_dev(pdev, state);
-
-	link_state->enabled_state = state;
-}
-
-static void __pcie_aspm_configure_link_state(struct pci_dev *pdev,
-	unsigned int state)
-{
-	struct pcie_link_state *link_state = pdev->link_state;
-
-	if (link_state->support_state == 0)
-		return;
-	state &= PCIE_LINK_STATE_L0S|PCIE_LINK_STATE_L1;
-
-	/* state 0 means disabling aspm */
-	state = pcie_aspm_check_state(pdev, state);
-	if (link_state->enabled_state == state)
-		return;
-	__pcie_aspm_config_link(pdev, state);
-}
-
-/*
- * pcie_aspm_configure_link_state: enable/disable PCI express link state
- * @pdev: the root port or switch downstream port
- */
-static void pcie_aspm_configure_link_state(struct pci_dev *pdev,
-	unsigned int state)
-{
-	down_read(&pci_bus_sem);
-	mutex_lock(&aspm_lock);
-	__pcie_aspm_configure_link_state(pdev, state);
-	mutex_unlock(&aspm_lock);
-	up_read(&pci_bus_sem);
-}
-
-static void free_link_state(struct pci_dev *pdev)
-{
-	kfree(pdev->link_state);
-	pdev->link_state = NULL;
-}
-
-/*
- * pcie_aspm_init_link_state: Initiate PCI express link state.
- * It is called after the pcie and its children devices are scaned.
- * @pdev: the root port or switch downstream port
- */
-void pcie_aspm_init_link_state(struct pci_dev *pdev)
-{
-	unsigned int state;
-	struct pcie_link_state *link_state;
-	int error = 0;
-
-	if (aspm_disabled || !pdev->is_pcie || pdev->link_state)
-		return;
-	if (pdev->pcie_type != PCI_EXP_TYPE_ROOT_PORT &&
-		pdev->pcie_type != PCI_EXP_TYPE_DOWNSTREAM)
-		return;
-	down_read(&pci_bus_sem);
-	if (list_empty(&pdev->subordinate->devices))
-		goto out;
-
-	mutex_lock(&aspm_lock);
-
-	link_state = kzalloc(sizeof(*link_state), GFP_KERNEL);
-	if (!link_state)
-		goto unlock_out;
-	pdev->link_state = link_state;
-
-	pcie_aspm_configure_common_clock(pdev);
-
-	pcie_aspm_cap_init(pdev);
-
-	/* config link state to avoid BIOS error */
-	state = pcie_aspm_check_state(pdev, policy_to_aspm_state(pdev));
-	__pcie_aspm_config_link(pdev, state);
-
-	pcie_check_clock_pm(pdev);
-
-	link_state->pdev = pdev;
-	list_add(&link_state->sibiling, &link_list);
-
-unlock_out:
-	if (error)
-		free_link_state(pdev);
-	mutex_unlock(&aspm_lock);
-out:
-	up_read(&pci_bus_sem);
-}
-
-/* @pdev: the endpoint device */
-void pcie_aspm_exit_link_state(struct pci_dev *pdev)
-{
-	struct pci_dev *parent = pdev->bus->self;
-	struct pcie_link_state *link_state = parent->link_state;
-
-	if (aspm_disabled || !pdev->is_pcie || !parent || !link_state)
-		return;
-	if (parent->pcie_type != PCI_EXP_TYPE_ROOT_PORT &&
-		parent->pcie_type != PCI_EXP_TYPE_DOWNSTREAM)
-		return;
-	down_read(&pci_bus_sem);
-	mutex_lock(&aspm_lock);
-
-	/*
-	 * All PCIe functions are in one slot, remove one function will remove
-	 * the the whole slot, so just wait
-	 */
-	if (!list_empty(&parent->subordinate->devices))
-		goto out;
-
-	/* All functions are removed, so just disable ASPM for the link */
-	__pcie_aspm_config_one_dev(parent, 0);
-	list_del(&link_state->sibiling);
-	/* Clock PM is for endpoint device */
-
-	free_link_state(parent);
-out:
-	mutex_unlock(&aspm_lock);
-	up_read(&pci_bus_sem);
-}
-
-/* @pdev: the root port or switch downstream port */
-void pcie_aspm_pm_state_change(struct pci_dev *pdev)
-{
-	struct pcie_link_state *link_state = pdev->link_state;
-
-	if (aspm_disabled || !pdev->is_pcie || !pdev->link_state)
-		return;
-	if (pdev->pcie_type != PCI_EXP_TYPE_ROOT_PORT &&
-		pdev->pcie_type != PCI_EXP_TYPE_DOWNSTREAM)
-		return;
-	/*
-	 * devices changed PM state, we should recheck if latency meets all
-	 * functions' requirement
-	 */
-	pcie_aspm_configure_link_state(pdev, link_state->enabled_state);
-}
-
-/*
- * pci_disable_link_state - disable pci device's link state, so the link will
- * never enter specific states
- */
-void pci_disable_link_state(struct pci_dev *pdev, int state)
-{
-	struct pci_dev *parent = pdev->bus->self;
-	struct pcie_link_state *link_state;
-
-	if (aspm_disabled || !pdev->is_pcie)
-		return;
-	if (pdev->pcie_type == PCI_EXP_TYPE_ROOT_PORT ||
-	    pdev->pcie_type == PCI_EXP_TYPE_DOWNSTREAM)
-		parent = pdev;
-	if (!parent)
-		return;
-
-	down_read(&pci_bus_sem);
-	mutex_lock(&aspm_lock);
-	link_state = parent->link_state;
-	link_state->support_state &=
-		~(state & (PCIE_LINK_STATE_L0S|PCIE_LINK_STATE_L1));
-	if (state & PCIE_LINK_STATE_CLKPM)
-		link_state->clk_pm_capable = 0;
-
-	__pcie_aspm_configure_link_state(parent, link_state->enabled_state);
-	if (!link_state->clk_pm_capable && link_state->clk_pm_enabled)
-		pcie_set_clock_pm(parent, 0);
-	mutex_unlock(&aspm_lock);
-	up_read(&pci_bus_sem);
-}
-EXPORT_SYMBOL(pci_disable_link_state);
-
-static int pcie_aspm_set_policy(const char *val, struct kernel_param *kp)
-{
-	int i;
-	struct pci_dev *pdev;
-	struct pcie_link_state *link_state;
-
-	for (i = 0; i < ARRAY_SIZE(policy_str); i++)
-		if (!strncmp(val, policy_str[i], strlen(policy_str[i])))
-			break;
-	if (i >= ARRAY_SIZE(policy_str))
-		return -EINVAL;
-	if (i == aspm_policy)
-		return 0;
-
-	down_read(&pci_bus_sem);
-	mutex_lock(&aspm_lock);
-	aspm_policy = i;
-	list_for_each_entry(link_state, &link_list, sibiling) {
-		pdev = link_state->pdev;
-		__pcie_aspm_configure_link_state(pdev,
-			policy_to_aspm_state(pdev));
-		if (link_state->clk_pm_capable &&
-		    link_state->clk_pm_enabled != policy_to_clkpm_state(pdev))
-			pcie_set_clock_pm(pdev, policy_to_clkpm_state(pdev));
-
-	}
-	mutex_unlock(&aspm_lock);
-	up_read(&pci_bus_sem);
-	return 0;
-}
-
-static int pcie_aspm_get_policy(char *buffer, struct kernel_param *kp)
-{
-	int i, cnt = 0;
-	for (i = 0; i < ARRAY_SIZE(policy_str); i++)
-		if (i == aspm_policy)
-			cnt += sprintf(buffer + cnt, "[%s] ", policy_str[i]);
-		else
-			cnt += sprintf(buffer + cnt, "%s ", policy_str[i]);
-	return cnt;
-}
-
-module_param_call(policy, pcie_aspm_set_policy, pcie_aspm_get_policy,
-	NULL, 0644);
-
-#ifdef CONFIG_PCIEASPM_DEBUG
-static ssize_t link_state_show(struct device *dev,
-		struct device_attribute *attr,
-		char *buf)
-{
-	struct pci_dev *pci_device = to_pci_dev(dev);
-	struct pcie_link_state *link_state = pci_device->link_state;
-
-	return sprintf(buf, "%d\n", link_state->enabled_state);
-}
-
-static ssize_t link_state_store(struct device *dev,
-		struct device_attribute *attr,
-		const char *buf,
-		size_t n)
-{
-	struct pci_dev *pci_device = to_pci_dev(dev);
-	int state;
-
-	if (n < 1)
-		return -EINVAL;
-	state = buf[0]-'0';
-	if (state >= 0 && state <= 3) {
-		/* setup link aspm state */
-		pcie_aspm_configure_link_state(pci_device, state);
-		return n;
-	}
-
-	return -EINVAL;
-}
-
-static ssize_t clk_ctl_show(struct device *dev,
-		struct device_attribute *attr,
-		char *buf)
-{
-	struct pci_dev *pci_device = to_pci_dev(dev);
-	struct pcie_link_state *link_state = pci_device->link_state;
-
-	return sprintf(buf, "%d\n", link_state->clk_pm_enabled);
-}
-
-static ssize_t clk_ctl_store(struct device *dev,
-		struct device_attribute *attr,
-		const char *buf,
-		size_t n)
-{
-	struct pci_dev *pci_device = to_pci_dev(dev);
-	int state;
-
-	if (n < 1)
-		return -EINVAL;
-	state = buf[0]-'0';
-
-	down_read(&pci_bus_sem);
-	mutex_lock(&aspm_lock);
-	pcie_set_clock_pm(pci_device, !!state);
-	mutex_unlock(&aspm_lock);
-	up_read(&pci_bus_sem);
-
-	return n;
-}
-
-static DEVICE_ATTR(link_state, 0644, link_state_show, link_state_store);
-static DEVICE_ATTR(clk_ctl, 0644, clk_ctl_show, clk_ctl_store);
-
-static char power_group[] = "power";
-void pcie_aspm_create_sysfs_dev_files(struct pci_dev *pdev)
-{
-	struct pcie_link_state *link_state = pdev->link_state;
-
-	if (!pdev->is_pcie || (pdev->pcie_type != PCI_EXP_TYPE_ROOT_PORT &&
-		pdev->pcie_type != PCI_EXP_TYPE_DOWNSTREAM))
-		return;
-
-	if (link_state->support_state)
-		sysfs_add_file_to_group(&pdev->dev.kobj,
-			&dev_attr_link_state.attr, power_group);
-	if (link_state->clk_pm_capable)
-		sysfs_add_file_to_group(&pdev->dev.kobj,
-			&dev_attr_clk_ctl.attr, power_group);
-}
-
-void pcie_aspm_remove_sysfs_dev_files(struct pci_dev *pdev)
-{
-	struct pcie_link_state *link_state = pdev->link_state;
-
-	if (!pdev->is_pcie || (pdev->pcie_type != PCI_EXP_TYPE_ROOT_PORT &&
-		pdev->pcie_type != PCI_EXP_TYPE_DOWNSTREAM))
-		return;
-
-	if (link_state->support_state)
-		sysfs_remove_file_from_group(&pdev->dev.kobj,
-			&dev_attr_link_state.attr, power_group);
-	if (link_state->clk_pm_capable)
-		sysfs_remove_file_from_group(&pdev->dev.kobj,
-			&dev_attr_clk_ctl.attr, power_group);
-}
-#endif
-
-static int __init pcie_aspm_disable(char *str)
-{
-	aspm_disabled = 1;
-	return 1;
-}
-
-__setup("pcie_noaspm", pcie_aspm_disable);
-
-static int __init pcie_aspm_init(void)
-{
-	if (aspm_disabled)
-		return 0;
-	pci_osc_support_set(OSC_ACTIVE_STATE_PWR_SUPPORT|
-		OSC_CLOCK_PWR_CAPABILITY_SUPPORT);
-	return 0;
-}
-
-fs_initcall(pcie_aspm_init);