PCI: PCIe: Move PCIe PME code to the pcie directory

The PCIe PME code only consists of one file, so it doesn't need to
occupy its own directory.  Move it to drivers/pci/pcie/pme.c and
remove the contents of drivers/pci/pcie/pme .

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 0 insertions, 462 deletions

diff --git a/drivers/pci/pcie/pme/pcie_pme.c b/drivers/pci/pcie/pme/pcie_pme.c
deleted file mode 100644
index 9d1361e1a776..000000000000
--- a/drivers/pci/pcie/pme/pcie_pme.c
+++ /dev/null
@@ -1,462 +0,0 @@
-/*
- * PCIe Native PME support
- *
- * Copyright (C) 2007 - 2009 Intel Corp
- * Copyright (C) 2007 - 2009 Shaohua Li <shaohua.li@intel.com>
- * Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License V2.  See the file "COPYING" in the main directory of this archive
- * for more details.
- */
-
-#include <linux/module.h>
-#include <linux/pci.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/device.h>
-#include <linux/pcieport_if.h>
-#include <linux/acpi.h>
-#include <linux/pci-acpi.h>
-#include <linux/pm_runtime.h>
-
-#include "../../pci.h"
-#include "../portdrv.h"
-
-#define PCI_EXP_RTSTA_PME	0x10000 /* PME status */
-#define PCI_EXP_RTSTA_PENDING	0x20000 /* PME pending */
-
-/*
- * If this switch is set, MSI will not be used for PCIe PME signaling.  This
- * causes the PCIe port driver to use INTx interrupts only, but it turns out
- * that using MSI for PCIe PME signaling doesn't play well with PCIe PME-based
- * wake-up from system sleep states.
- */
-bool pcie_pme_msi_disabled;
-
-static int __init pcie_pme_setup(char *str)
-{
-	if (!strncmp(str, "nomsi", 5))
-		pcie_pme_msi_disabled = true;
-
-	return 1;
-}
-__setup("pcie_pme=", pcie_pme_setup);
-
-struct pcie_pme_service_data {
-	spinlock_t lock;
-	struct pcie_device *srv;
-	struct work_struct work;
-	bool noirq; /* Don't enable the PME interrupt used by this service. */
-};
-
-/**
- * pcie_pme_interrupt_enable - Enable/disable PCIe PME interrupt generation.
- * @dev: PCIe root port or event collector.
- * @enable: Enable or disable the interrupt.
- */
-void pcie_pme_interrupt_enable(struct pci_dev *dev, bool enable)
-{
-	int rtctl_pos;
-	u16 rtctl;
-
-	rtctl_pos = pci_pcie_cap(dev) + PCI_EXP_RTCTL;
-
-	pci_read_config_word(dev, rtctl_pos, &rtctl);
-	if (enable)
-		rtctl |= PCI_EXP_RTCTL_PMEIE;
-	else
-		rtctl &= ~PCI_EXP_RTCTL_PMEIE;
-	pci_write_config_word(dev, rtctl_pos, rtctl);
-}
-
-/**
- * pcie_pme_clear_status - Clear root port PME interrupt status.
- * @dev: PCIe root port or event collector.
- */
-static void pcie_pme_clear_status(struct pci_dev *dev)
-{
-	int rtsta_pos;
-	u32 rtsta;
-
-	rtsta_pos = pci_pcie_cap(dev) + PCI_EXP_RTSTA;
-
-	pci_read_config_dword(dev, rtsta_pos, &rtsta);
-	rtsta |= PCI_EXP_RTSTA_PME;
-	pci_write_config_dword(dev, rtsta_pos, rtsta);
-}
-
-/**
- * pcie_pme_walk_bus - Scan a PCI bus for devices asserting PME#.
- * @bus: PCI bus to scan.
- *
- * Scan given PCI bus and all buses under it for devices asserting PME#.
- */
-static bool pcie_pme_walk_bus(struct pci_bus *bus)
-{
-	struct pci_dev *dev;
-	bool ret = false;
-
-	list_for_each_entry(dev, &bus->devices, bus_list) {
-		/* Skip PCIe devices in case we started from a root port. */
-		if (!pci_is_pcie(dev) && pci_check_pme_status(dev)) {
-			pm_request_resume(&dev->dev);
-			pci_wakeup_event(dev);
-			ret = true;
-		}
-
-		if (dev->subordinate && pcie_pme_walk_bus(dev->subordinate))
-			ret = true;
-	}
-
-	return ret;
-}
-
-/**
- * pcie_pme_from_pci_bridge - Check if PCIe-PCI bridge generated a PME.
- * @bus: Secondary bus of the bridge.
- * @devfn: Device/function number to check.
- *
- * PME from PCI devices under a PCIe-PCI bridge may be converted to an in-band
- * PCIe PME message.  In such that case the bridge should use the Requester ID
- * of device/function number 0 on its secondary bus.
- */
-static bool pcie_pme_from_pci_bridge(struct pci_bus *bus, u8 devfn)
-{
-	struct pci_dev *dev;
-	bool found = false;
-
-	if (devfn)
-		return false;
-
-	dev = pci_dev_get(bus->self);
-	if (!dev)
-		return false;
-
-	if (pci_is_pcie(dev) && dev->pcie_type == PCI_EXP_TYPE_PCI_BRIDGE) {
-		down_read(&pci_bus_sem);
-		if (pcie_pme_walk_bus(bus))
-			found = true;
-		up_read(&pci_bus_sem);
-	}
-
-	pci_dev_put(dev);
-	return found;
-}
-
-/**
- * pcie_pme_handle_request - Find device that generated PME and handle it.
- * @port: Root port or event collector that generated the PME interrupt.
- * @req_id: PCIe Requester ID of the device that generated the PME.
- */
-static void pcie_pme_handle_request(struct pci_dev *port, u16 req_id)
-{
-	u8 busnr = req_id >> 8, devfn = req_id & 0xff;
-	struct pci_bus *bus;
-	struct pci_dev *dev;
-	bool found = false;
-
-	/* First, check if the PME is from the root port itself. */
-	if (port->devfn == devfn && port->bus->number == busnr) {
-		if (pci_check_pme_status(port)) {
-			pm_request_resume(&port->dev);
-			found = true;
-		} else {
-			/*
-			 * Apparently, the root port generated the PME on behalf
-			 * of a non-PCIe device downstream.  If this is done by
-			 * a root port, the Requester ID field in its status
-			 * register may contain either the root port's, or the
-			 * source device's information (PCI Express Base
-			 * Specification, Rev. 2.0, Section 6.1.9).
-			 */
-			down_read(&pci_bus_sem);
-			found = pcie_pme_walk_bus(port->subordinate);
-			up_read(&pci_bus_sem);
-		}
-		goto out;
-	}
-
-	/* Second, find the bus the source device is on. */
-	bus = pci_find_bus(pci_domain_nr(port->bus), busnr);
-	if (!bus)
-		goto out;
-
-	/* Next, check if the PME is from a PCIe-PCI bridge. */
-	found = pcie_pme_from_pci_bridge(bus, devfn);
-	if (found)
-		goto out;
-
-	/* Finally, try to find the PME source on the bus. */
-	down_read(&pci_bus_sem);
-	list_for_each_entry(dev, &bus->devices, bus_list) {
-		pci_dev_get(dev);
-		if (dev->devfn == devfn) {
-			found = true;
-			break;
-		}
-		pci_dev_put(dev);
-	}
-	up_read(&pci_bus_sem);
-
-	if (found) {
-		/* The device is there, but we have to check its PME status. */
-		found = pci_check_pme_status(dev);
-		if (found) {
-			pm_request_resume(&dev->dev);
-			pci_wakeup_event(dev);
-		}
-		pci_dev_put(dev);
-	} else if (devfn) {
-		/*
-		 * The device is not there, but we can still try to recover by
-		 * assuming that the PME was reported by a PCIe-PCI bridge that
-		 * used devfn different from zero.
-		 */
-		dev_dbg(&port->dev, "PME interrupt generated for "
-			"non-existent device %02x:%02x.%d\n",
-			busnr, PCI_SLOT(devfn), PCI_FUNC(devfn));
-		found = pcie_pme_from_pci_bridge(bus, 0);
-	}
-
- out:
-	if (!found)
-		dev_dbg(&port->dev, "Spurious native PME interrupt!\n");
-}
-
-/**
- * pcie_pme_work_fn - Work handler for PCIe PME interrupt.
- * @work: Work structure giving access to service data.
- */
-static void pcie_pme_work_fn(struct work_struct *work)
-{
-	struct pcie_pme_service_data *data =
-			container_of(work, struct pcie_pme_service_data, work);
-	struct pci_dev *port = data->srv->port;
-	int rtsta_pos;
-	u32 rtsta;
-
-	rtsta_pos = pci_pcie_cap(port) + PCI_EXP_RTSTA;
-
-	spin_lock_irq(&data->lock);
-
-	for (;;) {
-		if (data->noirq)
-			break;
-
-		pci_read_config_dword(port, rtsta_pos, &rtsta);
-		if (rtsta & PCI_EXP_RTSTA_PME) {
-			/*
-			 * Clear PME status of the port.  If there are other
-			 * pending PMEs, the status will be set again.
-			 */
-			pcie_pme_clear_status(port);
-
-			spin_unlock_irq(&data->lock);
-			pcie_pme_handle_request(port, rtsta & 0xffff);
-			spin_lock_irq(&data->lock);
-
-			continue;
-		}
-
-		/* No need to loop if there are no more PMEs pending. */
-		if (!(rtsta & PCI_EXP_RTSTA_PENDING))
-			break;
-
-		spin_unlock_irq(&data->lock);
-		cpu_relax();
-		spin_lock_irq(&data->lock);
-	}
-
-	if (!data->noirq)
-		pcie_pme_interrupt_enable(port, true);
-
-	spin_unlock_irq(&data->lock);
-}
-
-/**
- * pcie_pme_irq - Interrupt handler for PCIe root port PME interrupt.
- * @irq: Interrupt vector.
- * @context: Interrupt context pointer.
- */
-static irqreturn_t pcie_pme_irq(int irq, void *context)
-{
-	struct pci_dev *port;
-	struct pcie_pme_service_data *data;
-	int rtsta_pos;
-	u32 rtsta;
-	unsigned long flags;
-
-	port = ((struct pcie_device *)context)->port;
-	data = get_service_data((struct pcie_device *)context);
-
-	rtsta_pos = pci_pcie_cap(port) + PCI_EXP_RTSTA;
-
-	spin_lock_irqsave(&data->lock, flags);
-	pci_read_config_dword(port, rtsta_pos, &rtsta);
-
-	if (!(rtsta & PCI_EXP_RTSTA_PME)) {
-		spin_unlock_irqrestore(&data->lock, flags);
-		return IRQ_NONE;
-	}
-
-	pcie_pme_interrupt_enable(port, false);
-	spin_unlock_irqrestore(&data->lock, flags);
-
-	/* We don't use pm_wq, because it's freezable. */
-	schedule_work(&data->work);
-
-	return IRQ_HANDLED;
-}
-
-/**
- * pcie_pme_set_native - Set the PME interrupt flag for given device.
- * @dev: PCI device to handle.
- * @ign: Ignored.
- */
-static int pcie_pme_set_native(struct pci_dev *dev, void *ign)
-{
-	dev_info(&dev->dev, "Signaling PME through PCIe PME interrupt\n");
-
-	device_set_run_wake(&dev->dev, true);
-	dev->pme_interrupt = true;
-	return 0;
-}
-
-/**
- * pcie_pme_mark_devices - Set the PME interrupt flag for devices below a port.
- * @port: PCIe root port or event collector to handle.
- *
- * For each device below given root port, including the port itself (or for each
- * root complex integrated endpoint if @port is a root complex event collector)
- * set the flag indicating that it can signal run-time wake-up events via PCIe
- * PME interrupts.
- */
-static void pcie_pme_mark_devices(struct pci_dev *port)
-{
-	pcie_pme_set_native(port, NULL);
-	if (port->subordinate) {
-		pci_walk_bus(port->subordinate, pcie_pme_set_native, NULL);
-	} else {
-		struct pci_bus *bus = port->bus;
-		struct pci_dev *dev;
-
-		/* Check if this is a root port event collector. */
-		if (port->pcie_type != PCI_EXP_TYPE_RC_EC || !bus)
-			return;
-
-		down_read(&pci_bus_sem);
-		list_for_each_entry(dev, &bus->devices, bus_list)
-			if (pci_is_pcie(dev)
-			    && dev->pcie_type == PCI_EXP_TYPE_RC_END)
-				pcie_pme_set_native(dev, NULL);
-		up_read(&pci_bus_sem);
-	}
-}
-
-/**
- * pcie_pme_probe - Initialize PCIe PME service for given root port.
- * @srv: PCIe service to initialize.
- */
-static int pcie_pme_probe(struct pcie_device *srv)
-{
-	struct pci_dev *port;
-	struct pcie_pme_service_data *data;
-	int ret;
-
-	data = kzalloc(sizeof(*data), GFP_KERNEL);
-	if (!data)
-		return -ENOMEM;
-
-	spin_lock_init(&data->lock);
-	INIT_WORK(&data->work, pcie_pme_work_fn);
-	data->srv = srv;
-	set_service_data(srv, data);
-
-	port = srv->port;
-	pcie_pme_interrupt_enable(port, false);
-	pcie_pme_clear_status(port);
-
-	ret = request_irq(srv->irq, pcie_pme_irq, IRQF_SHARED, "PCIe PME", srv);
-	if (ret) {
-		kfree(data);
-	} else {
-		pcie_pme_mark_devices(port);
-		pcie_pme_interrupt_enable(port, true);
-	}
-
-	return ret;
-}
-
-/**
- * pcie_pme_suspend - Suspend PCIe PME service device.
- * @srv: PCIe service device to suspend.
- */
-static int pcie_pme_suspend(struct pcie_device *srv)
-{
-	struct pcie_pme_service_data *data = get_service_data(srv);
-	struct pci_dev *port = srv->port;
-
-	spin_lock_irq(&data->lock);
-	pcie_pme_interrupt_enable(port, false);
-	pcie_pme_clear_status(port);
-	data->noirq = true;
-	spin_unlock_irq(&data->lock);
-
-	synchronize_irq(srv->irq);
-
-	return 0;
-}
-
-/**
- * pcie_pme_resume - Resume PCIe PME service device.
- * @srv - PCIe service device to resume.
- */
-static int pcie_pme_resume(struct pcie_device *srv)
-{
-	struct pcie_pme_service_data *data = get_service_data(srv);
-	struct pci_dev *port = srv->port;
-
-	spin_lock_irq(&data->lock);
-	data->noirq = false;
-	pcie_pme_clear_status(port);
-	pcie_pme_interrupt_enable(port, true);
-	spin_unlock_irq(&data->lock);
-
-	return 0;
-}
-
-/**
- * pcie_pme_remove - Prepare PCIe PME service device for removal.
- * @srv - PCIe service device to resume.
- */
-static void pcie_pme_remove(struct pcie_device *srv)
-{
-	pcie_pme_suspend(srv);
-	free_irq(srv->irq, srv);
-	kfree(get_service_data(srv));
-}
-
-static struct pcie_port_service_driver pcie_pme_driver = {
-	.name		= "pcie_pme",
-	.port_type 	= PCI_EXP_TYPE_ROOT_PORT,
-	.service 	= PCIE_PORT_SERVICE_PME,
-
-	.probe		= pcie_pme_probe,
-	.suspend	= pcie_pme_suspend,
-	.resume		= pcie_pme_resume,
-	.remove		= pcie_pme_remove,
-};
-
-/**
- * pcie_pme_service_init - Register the PCIe PME service driver.
- */
-static int __init pcie_pme_service_init(void)
-{
-	return pcie_port_service_register(&pcie_pme_driver);
-}
-
-module_init(pcie_pme_service_init);