1 files changed, 289 insertions, 110 deletions

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 6d6120007af4..34bf0fdf5047 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -20,6 +20,8 @@
 #include <linux/pm_wakeup.h>
 #include <linux/interrupt.h>
 #include <asm/dma.h>	/* isa_dma_bridge_buggy */
+#include <linux/device.h>
+#include <asm/setup.h>
 #include "pci.h"
 
 unsigned int pci_pm_d3_delay = PCI_PM_D3_WAIT;
@@ -426,7 +428,6 @@ static inline int platform_pci_sleep_wake(struct pci_dev *dev, bool enable)
  *                           given PCI device
  * @dev: PCI device to handle.
  * @state: PCI power state (D0, D1, D2, D3hot) to put the device into.
- * @wait: If 'true', wait for the device to change its power state
  *
  * RETURN VALUE:
  * -EINVAL if the requested state is invalid.
@@ -435,12 +436,15 @@ static inline int platform_pci_sleep_wake(struct pci_dev *dev, bool enable)
  * 0 if device already is in the requested state.
  * 0 if device's power state has been successfully changed.
  */
-static int
-pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state, bool wait)
+static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state)
 {
 	u16 pmcsr;
 	bool need_restore = false;
 
+	/* Check if we're already there */
+	if (dev->current_state == state)
+		return 0;
+
 	if (!dev->pm_cap)
 		return -EIO;
 
@@ -451,10 +455,7 @@ pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state, bool wait)
 	 * Can enter D0 from any state, but if we can only go deeper 
 	 * to sleep if we're already in a low power state
 	 */
-	if (dev->current_state == state) {
-		/* we're already there */
-		return 0;
-	} else if (state != PCI_D0 && dev->current_state <= PCI_D3cold
+	if (state != PCI_D0 && dev->current_state <= PCI_D3cold
 	    && dev->current_state > state) {
 		dev_err(&dev->dev, "invalid power transition "
 			"(from state %d to %d)\n", dev->current_state, state);
@@ -481,10 +482,8 @@ pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state, bool wait)
 		break;
 	case PCI_UNKNOWN: /* Boot-up */
 		if ((pmcsr & PCI_PM_CTRL_STATE_MASK) == PCI_D3hot
-		 && !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET)) {
+		 && !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET))
 			need_restore = true;
-			wait = true;
-		}
 		/* Fall-through: force to D0 */
 	default:
 		pmcsr = 0;
@@ -494,9 +493,6 @@ pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state, bool wait)
 	/* enter specified state */
 	pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr);
 
-	if (!wait)
-		return 0;
-
 	/* Mandatory power management transition delays */
 	/* see PCI PM 1.1 5.6.1 table 18 */
 	if (state == PCI_D3hot || dev->current_state == PCI_D3hot)
@@ -521,7 +517,7 @@ pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state, bool wait)
 	if (need_restore)
 		pci_restore_bars(dev);
 
-	if (wait && dev->bus->self)
+	if (dev->bus->self)
 		pcie_aspm_pm_state_change(dev->bus->self);
 
 	return 0;
@@ -546,11 +542,58 @@ void pci_update_current_state(struct pci_dev *dev, pci_power_t state)
 }
 
 /**
+ * pci_platform_power_transition - Use platform to change device power state
+ * @dev: PCI device to handle.
+ * @state: State to put the device into.
+ */
+static int pci_platform_power_transition(struct pci_dev *dev, pci_power_t state)
+{
+	int error;
+
+	if (platform_pci_power_manageable(dev)) {
+		error = platform_pci_set_power_state(dev, state);
+		if (!error)
+			pci_update_current_state(dev, state);
+	} else {
+		error = -ENODEV;
+		/* Fall back to PCI_D0 if native PM is not supported */
+		pci_update_current_state(dev, PCI_D0);
+	}
+
+	return error;
+}
+
+/**
+ * __pci_start_power_transition - Start power transition of a PCI device
+ * @dev: PCI device to handle.
+ * @state: State to put the device into.
+ */
+static void __pci_start_power_transition(struct pci_dev *dev, pci_power_t state)
+{
+	if (state == PCI_D0)
+		pci_platform_power_transition(dev, PCI_D0);
+}
+
+/**
+ * __pci_complete_power_transition - Complete power transition of a PCI device
+ * @dev: PCI device to handle.
+ * @state: State to put the device into.
+ *
+ * This function should not be called directly by device drivers.
+ */
+int __pci_complete_power_transition(struct pci_dev *dev, pci_power_t state)
+{
+	return state > PCI_D0 ?
+			pci_platform_power_transition(dev, state) : -EINVAL;
+}
+EXPORT_SYMBOL_GPL(__pci_complete_power_transition);
+
+/**
  * pci_set_power_state - Set the power state of a PCI device
  * @dev: PCI device to handle.
  * @state: PCI power state (D0, D1, D2, D3hot) to put the device into.
  *
- * Transition a device to a new power state, using the platform formware and/or
+ * Transition a device to a new power state, using the platform firmware and/or
  * the device's PCI PM registers.
  *
  * RETURN VALUE:
@@ -577,30 +620,21 @@ int pci_set_power_state(struct pci_dev *dev, pci_power_t state)
 		 */
 		return 0;
 
-	if (state == PCI_D0 && platform_pci_power_manageable(dev)) {
-		/*
-		 * Allow the platform to change the state, for example via ACPI
-		 * _PR0, _PS0 and some such, but do not trust it.
-		 */
-		int ret = platform_pci_set_power_state(dev, PCI_D0);
-		if (!ret)
-			pci_update_current_state(dev, PCI_D0);
-	}
+	/* Check if we're already there */
+	if (dev->current_state == state)
+		return 0;
+
+	__pci_start_power_transition(dev, state);
+
 	/* This device is quirked not to be put into D3, so
 	   don't put it in D3 */
 	if (state == PCI_D3hot && (dev->dev_flags & PCI_DEV_FLAGS_NO_D3))
 		return 0;
 
-	error = pci_raw_set_power_state(dev, state, true);
+	error = pci_raw_set_power_state(dev, state);
 
-	if (state > PCI_D0 && platform_pci_power_manageable(dev)) {
-		/* Allow the platform to finalize the transition */
-		int ret = platform_pci_set_power_state(dev, state);
-		if (!ret) {
-			pci_update_current_state(dev, state);
-			error = 0;
-		}
-	}
+	if (!__pci_complete_power_transition(dev, state))
+		error = 0;
 
 	return error;
 }
@@ -645,11 +679,36 @@ pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state)
 
 EXPORT_SYMBOL(pci_choose_state);
 
+#define PCI_EXP_SAVE_REGS	7
+
+#define pcie_cap_has_devctl(type, flags)	1
+#define pcie_cap_has_lnkctl(type, flags)		\
+		((flags & PCI_EXP_FLAGS_VERS) > 1 ||	\
+		 (type == PCI_EXP_TYPE_ROOT_PORT ||	\
+		  type == PCI_EXP_TYPE_ENDPOINT ||	\
+		  type == PCI_EXP_TYPE_LEG_END))
+#define pcie_cap_has_sltctl(type, flags)		\
+		((flags & PCI_EXP_FLAGS_VERS) > 1 ||	\
+		 ((type == PCI_EXP_TYPE_ROOT_PORT) ||	\
+		  (type == PCI_EXP_TYPE_DOWNSTREAM &&	\
+		   (flags & PCI_EXP_FLAGS_SLOT))))
+#define pcie_cap_has_rtctl(type, flags)			\
+		((flags & PCI_EXP_FLAGS_VERS) > 1 ||	\
+		 (type == PCI_EXP_TYPE_ROOT_PORT ||	\
+		  type == PCI_EXP_TYPE_RC_EC))
+#define pcie_cap_has_devctl2(type, flags)		\
+		((flags & PCI_EXP_FLAGS_VERS) > 1)
+#define pcie_cap_has_lnkctl2(type, flags)		\
+		((flags & PCI_EXP_FLAGS_VERS) > 1)
+#define pcie_cap_has_sltctl2(type, flags)		\
+		((flags & PCI_EXP_FLAGS_VERS) > 1)
+
 static int pci_save_pcie_state(struct pci_dev *dev)
 {
 	int pos, i = 0;
 	struct pci_cap_saved_state *save_state;
 	u16 *cap;
+	u16 flags;
 
 	pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
 	if (pos <= 0)
@@ -657,15 +716,27 @@ static int pci_save_pcie_state(struct pci_dev *dev)
 
 	save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
 	if (!save_state) {
-		dev_err(&dev->dev, "buffer not found in %s\n", __FUNCTION__);
+		dev_err(&dev->dev, "buffer not found in %s\n", __func__);
 		return -ENOMEM;
 	}
 	cap = (u16 *)&save_state->data[0];
 
-	pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &cap[i++]);
-	pci_read_config_word(dev, pos + PCI_EXP_LNKCTL, &cap[i++]);
-	pci_read_config_word(dev, pos + PCI_EXP_SLTCTL, &cap[i++]);
-	pci_read_config_word(dev, pos + PCI_EXP_RTCTL, &cap[i++]);
+	pci_read_config_word(dev, pos + PCI_EXP_FLAGS, &flags);
+
+	if (pcie_cap_has_devctl(dev->pcie_type, flags))
+		pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &cap[i++]);
+	if (pcie_cap_has_lnkctl(dev->pcie_type, flags))
+		pci_read_config_word(dev, pos + PCI_EXP_LNKCTL, &cap[i++]);
+	if (pcie_cap_has_sltctl(dev->pcie_type, flags))
+		pci_read_config_word(dev, pos + PCI_EXP_SLTCTL, &cap[i++]);
+	if (pcie_cap_has_rtctl(dev->pcie_type, flags))
+		pci_read_config_word(dev, pos + PCI_EXP_RTCTL, &cap[i++]);
+	if (pcie_cap_has_devctl2(dev->pcie_type, flags))
+		pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &cap[i++]);
+	if (pcie_cap_has_lnkctl2(dev->pcie_type, flags))
+		pci_read_config_word(dev, pos + PCI_EXP_LNKCTL2, &cap[i++]);
+	if (pcie_cap_has_sltctl2(dev->pcie_type, flags))
+		pci_read_config_word(dev, pos + PCI_EXP_SLTCTL2, &cap[i++]);
 
 	return 0;
 }
@@ -675,6 +746,7 @@ static void pci_restore_pcie_state(struct pci_dev *dev)
 	int i = 0, pos;
 	struct pci_cap_saved_state *save_state;
 	u16 *cap;
+	u16 flags;
 
 	save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
 	pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
@@ -682,10 +754,22 @@ static void pci_restore_pcie_state(struct pci_dev *dev)
 		return;
 	cap = (u16 *)&save_state->data[0];
 
-	pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, cap[i++]);
-	pci_write_config_word(dev, pos + PCI_EXP_LNKCTL, cap[i++]);
-	pci_write_config_word(dev, pos + PCI_EXP_SLTCTL, cap[i++]);
-	pci_write_config_word(dev, pos + PCI_EXP_RTCTL, cap[i++]);
+	pci_read_config_word(dev, pos + PCI_EXP_FLAGS, &flags);
+
+	if (pcie_cap_has_devctl(dev->pcie_type, flags))
+		pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, cap[i++]);
+	if (pcie_cap_has_lnkctl(dev->pcie_type, flags))
+		pci_write_config_word(dev, pos + PCI_EXP_LNKCTL, cap[i++]);
+	if (pcie_cap_has_sltctl(dev->pcie_type, flags))
+		pci_write_config_word(dev, pos + PCI_EXP_SLTCTL, cap[i++]);
+	if (pcie_cap_has_rtctl(dev->pcie_type, flags))
+		pci_write_config_word(dev, pos + PCI_EXP_RTCTL, cap[i++]);
+	if (pcie_cap_has_devctl2(dev->pcie_type, flags))
+		pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, cap[i++]);
+	if (pcie_cap_has_lnkctl2(dev->pcie_type, flags))
+		pci_write_config_word(dev, pos + PCI_EXP_LNKCTL2, cap[i++]);
+	if (pcie_cap_has_sltctl2(dev->pcie_type, flags))
+		pci_write_config_word(dev, pos + PCI_EXP_SLTCTL2, cap[i++]);
 }
 
 
@@ -700,7 +784,7 @@ static int pci_save_pcix_state(struct pci_dev *dev)
 
 	save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX);
 	if (!save_state) {
-		dev_err(&dev->dev, "buffer not found in %s\n", __FUNCTION__);
+		dev_err(&dev->dev, "buffer not found in %s\n", __func__);
 		return -ENOMEM;
 	}
 
@@ -773,6 +857,7 @@ pci_restore_state(struct pci_dev *dev)
 	}
 	pci_restore_pcix_state(dev);
 	pci_restore_msi_state(dev);
+	pci_restore_iov_state(dev);
 
 	return 0;
 }
@@ -801,7 +886,7 @@ static int do_pci_enable_device(struct pci_dev *dev, int bars)
  */
 int pci_reenable_device(struct pci_dev *dev)
 {
-	if (atomic_read(&dev->enable_cnt))
+	if (pci_is_enabled(dev))
 		return do_pci_enable_device(dev, (1 << PCI_NUM_RESOURCES) - 1);
 	return 0;
 }
@@ -999,7 +1084,7 @@ static void do_pci_disable_device(struct pci_dev *dev)
  */
 void pci_disable_enabled_device(struct pci_dev *dev)
 {
-	if (atomic_read(&dev->enable_cnt))
+	if (pci_is_enabled(dev))
 		do_pci_disable_device(dev);
 }
 
@@ -1231,7 +1316,7 @@ int pci_prepare_to_sleep(struct pci_dev *dev)
 	if (target_state == PCI_POWER_ERROR)
 		return -EIO;
 
-	pci_enable_wake(dev, target_state, true);
+	pci_enable_wake(dev, target_state, device_may_wakeup(&dev->dev));
 
 	error = pci_set_power_state(dev, target_state);
 
@@ -1369,7 +1454,8 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev)
 {
 	int error;
 
-	error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_EXP, 4 * sizeof(u16));
+	error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_EXP,
+					PCI_EXP_SAVE_REGS * sizeof(u16));
 	if (error)
 		dev_err(&dev->dev,
 			"unable to preallocate PCI Express save buffer\n");
@@ -1381,50 +1467,6 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev)
 }
 
 /**
- * pci_restore_standard_config - restore standard config registers of PCI device
- * @dev: PCI device to handle
- *
- * This function assumes that the device's configuration space is accessible.
- * If the device needs to be powered up, the function will wait for it to
- * change the state.
- */
-int pci_restore_standard_config(struct pci_dev *dev)
-{
-	pci_power_t prev_state;
-	int error;
-
-	pci_update_current_state(dev, PCI_D0);
-
-	prev_state = dev->current_state;
-	if (prev_state == PCI_D0)
-		goto Restore;
-
-	error = pci_raw_set_power_state(dev, PCI_D0, false);
-	if (error)
-		return error;
-
-	/*
-	 * This assumes that we won't get a bus in B2 or B3 from the BIOS, but
-	 * we've made this assumption forever and it appears to be universally
-	 * satisfied.
-	 */
-	switch(prev_state) {
-	case PCI_D3cold:
-	case PCI_D3hot:
-		mdelay(pci_pm_d3_delay);
-		break;
-	case PCI_D2:
-		udelay(PCI_PM_D2_DELAY);
-		break;
-	}
-
-	pci_update_current_state(dev, PCI_D0);
-
- Restore:
-	return dev->state_saved ? pci_restore_state(dev) : 0;
-}
-
-/**
  * pci_enable_ari - enable ARI forwarding if hardware support it
  * @dev: the PCI device
  */
@@ -1484,7 +1526,7 @@ pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge)
 	if (!pin)
 		return -1;
 
-	while (dev->bus->self) {
+	while (dev->bus->parent) {
 		pin = pci_swizzle_interrupt_pin(dev, pin);
 		dev = dev->bus->self;
 	}
@@ -1504,7 +1546,7 @@ u8 pci_common_swizzle(struct pci_dev *dev, u8 *pinp)
 {
 	u8 pin = *pinp;
 
-	while (dev->bus->self) {
+	while (dev->bus->parent) {
 		pin = pci_swizzle_interrupt_pin(dev, pin);
 		dev = dev->bus->self;
 	}
@@ -2028,18 +2070,24 @@ static int __pcie_flr(struct pci_dev *dev, int probe)
 	pci_block_user_cfg_access(dev);
 
 	/* Wait for Transaction Pending bit clean */
+	pci_read_config_word(dev, exppos + PCI_EXP_DEVSTA, &status);
+	if (!(status & PCI_EXP_DEVSTA_TRPND))
+		goto transaction_done;
+
 	msleep(100);
 	pci_read_config_word(dev, exppos + PCI_EXP_DEVSTA, &status);
-	if (status & PCI_EXP_DEVSTA_TRPND) {
-		dev_info(&dev->dev, "Busy after 100ms while trying to reset; "
+	if (!(status & PCI_EXP_DEVSTA_TRPND))
+		goto transaction_done;
+
+	dev_info(&dev->dev, "Busy after 100ms while trying to reset; "
 			"sleeping for 1 second\n");
-		ssleep(1);
-		pci_read_config_word(dev, exppos + PCI_EXP_DEVSTA, &status);
-		if (status & PCI_EXP_DEVSTA_TRPND)
-			dev_info(&dev->dev, "Still busy after 1s; "
+	ssleep(1);
+	pci_read_config_word(dev, exppos + PCI_EXP_DEVSTA, &status);
+	if (status & PCI_EXP_DEVSTA_TRPND)
+		dev_info(&dev->dev, "Still busy after 1s; "
 				"proceeding with reset anyway\n");
-	}
 
+transaction_done:
 	pci_write_config_word(dev, exppos + PCI_EXP_DEVCTL,
 				PCI_EXP_DEVCTL_BCR_FLR);
 	mdelay(100);
@@ -2066,18 +2114,24 @@ static int __pci_af_flr(struct pci_dev *dev, int probe)
 	pci_block_user_cfg_access(dev);
 
 	/* Wait for Transaction Pending bit clean */
+	pci_read_config_byte(dev, cappos + PCI_AF_STATUS, &status);
+	if (!(status & PCI_AF_STATUS_TP))
+		goto transaction_done;
+
 	msleep(100);
 	pci_read_config_byte(dev, cappos + PCI_AF_STATUS, &status);
-	if (status & PCI_AF_STATUS_TP) {
-		dev_info(&dev->dev, "Busy after 100ms while trying to"
-				" reset; sleeping for 1 second\n");
-		ssleep(1);
-		pci_read_config_byte(dev,
-				cappos + PCI_AF_STATUS, &status);
-		if (status & PCI_AF_STATUS_TP)
-			dev_info(&dev->dev, "Still busy after 1s; "
-					"proceeding with reset anyway\n");
-	}
+	if (!(status & PCI_AF_STATUS_TP))
+		goto transaction_done;
+
+	dev_info(&dev->dev, "Busy after 100ms while trying to"
+			" reset; sleeping for 1 second\n");
+	ssleep(1);
+	pci_read_config_byte(dev, cappos + PCI_AF_STATUS, &status);
+	if (status & PCI_AF_STATUS_TP)
+		dev_info(&dev->dev, "Still busy after 1s; "
+				"proceeding with reset anyway\n");
+
+transaction_done:
 	pci_write_config_byte(dev, cappos + PCI_AF_CTRL, PCI_AF_CTRL_FLR);
 	mdelay(100);
 
@@ -2346,18 +2400,140 @@ int pci_select_bars(struct pci_dev *dev, unsigned long flags)
  */
 int pci_resource_bar(struct pci_dev *dev, int resno, enum pci_bar_type *type)
 {
+	int reg;
+
 	if (resno < PCI_ROM_RESOURCE) {
 		*type = pci_bar_unknown;
 		return PCI_BASE_ADDRESS_0 + 4 * resno;
 	} else if (resno == PCI_ROM_RESOURCE) {
 		*type = pci_bar_mem32;
 		return dev->rom_base_reg;
+	} else if (resno < PCI_BRIDGE_RESOURCES) {
+		/* device specific resource */
+		reg = pci_iov_resource_bar(dev, resno, type);
+		if (reg)
+			return reg;
 	}
 
 	dev_err(&dev->dev, "BAR: invalid resource #%d\n", resno);
 	return 0;
 }
 
+#define RESOURCE_ALIGNMENT_PARAM_SIZE COMMAND_LINE_SIZE
+static char resource_alignment_param[RESOURCE_ALIGNMENT_PARAM_SIZE] = {0};
+spinlock_t resource_alignment_lock = SPIN_LOCK_UNLOCKED;
+
+/**
+ * pci_specified_resource_alignment - get resource alignment specified by user.
+ * @dev: the PCI device to get
+ *
+ * RETURNS: Resource alignment if it is specified.
+ *          Zero if it is not specified.
+ */
+resource_size_t pci_specified_resource_alignment(struct pci_dev *dev)
+{
+	int seg, bus, slot, func, align_order, count;
+	resource_size_t align = 0;
+	char *p;
+
+	spin_lock(&resource_alignment_lock);
+	p = resource_alignment_param;
+	while (*p) {
+		count = 0;
+		if (sscanf(p, "%d%n", &align_order, &count) == 1 &&
+							p[count] == '@') {
+			p += count + 1;
+		} else {
+			align_order = -1;
+		}
+		if (sscanf(p, "%x:%x:%x.%x%n",
+			&seg, &bus, &slot, &func, &count) != 4) {
+			seg = 0;
+			if (sscanf(p, "%x:%x.%x%n",
+					&bus, &slot, &func, &count) != 3) {
+				/* Invalid format */
+				printk(KERN_ERR "PCI: Can't parse resource_alignment parameter: %s\n",
+					p);
+				break;
+			}
+		}
+		p += count;
+		if (seg == pci_domain_nr(dev->bus) &&
+			bus == dev->bus->number &&
+			slot == PCI_SLOT(dev->devfn) &&
+			func == PCI_FUNC(dev->devfn)) {
+			if (align_order == -1) {
+				align = PAGE_SIZE;
+			} else {
+				align = 1 << align_order;
+			}
+			/* Found */
+			break;
+		}
+		if (*p != ';' && *p != ',') {
+			/* End of param or invalid format */
+			break;
+		}
+		p++;
+	}
+	spin_unlock(&resource_alignment_lock);
+	return align;
+}
+
+/**
+ * pci_is_reassigndev - check if specified PCI is target device to reassign
+ * @dev: the PCI device to check
+ *
+ * RETURNS: non-zero for PCI device is a target device to reassign,
+ *          or zero is not.
+ */
+int pci_is_reassigndev(struct pci_dev *dev)
+{
+	return (pci_specified_resource_alignment(dev) != 0);
+}
+
+ssize_t pci_set_resource_alignment_param(const char *buf, size_t count)
+{
+	if (count > RESOURCE_ALIGNMENT_PARAM_SIZE - 1)
+		count = RESOURCE_ALIGNMENT_PARAM_SIZE - 1;
+	spin_lock(&resource_alignment_lock);
+	strncpy(resource_alignment_param, buf, count);
+	resource_alignment_param[count] = '\0';
+	spin_unlock(&resource_alignment_lock);
+	return count;
+}
+
+ssize_t pci_get_resource_alignment_param(char *buf, size_t size)
+{
+	size_t count;
+	spin_lock(&resource_alignment_lock);
+	count = snprintf(buf, size, "%s", resource_alignment_param);
+	spin_unlock(&resource_alignment_lock);
+	return count;
+}
+
+static ssize_t pci_resource_alignment_show(struct bus_type *bus, char *buf)
+{
+	return pci_get_resource_alignment_param(buf, PAGE_SIZE);
+}
+
+static ssize_t pci_resource_alignment_store(struct bus_type *bus,
+					const char *buf, size_t count)
+{
+	return pci_set_resource_alignment_param(buf, count);
+}
+
+BUS_ATTR(resource_alignment, 0644, pci_resource_alignment_show,
+					pci_resource_alignment_store);
+
+static int __init pci_resource_alignment_sysfs_init(void)
+{
+	return bus_create_file(&pci_bus_type,
+					&bus_attr_resource_alignment);
+}
+
+late_initcall(pci_resource_alignment_sysfs_init);
+
 static void __devinit pci_no_domains(void)
 {
 #ifdef CONFIG_PCI_DOMAINS
@@ -2406,6 +2582,9 @@ static int __init pci_setup(char *str)
 				pci_cardbus_io_size = memparse(str + 9, &str);
 			} else if (!strncmp(str, "cbmemsize=", 10)) {
 				pci_cardbus_mem_size = memparse(str + 10, &str);
+			} else if (!strncmp(str, "resource_alignment=", 19)) {
+				pci_set_resource_alignment_param(str + 19,
+							strlen(str + 19));
 			} else {
 				printk(KERN_ERR "PCI: Unknown option `%s'\n",
 						str);