From 271fb719cc472af3b1e96d8c527bb0da7060a172 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Sat, 21 Aug 2010 01:58:22 +0200 Subject: 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 Signed-off-by: Jesse Barnes --- drivers/pci/pcie/Makefile | 2 +- drivers/pci/pcie/pme.c | 462 ++++++++++++++++++++++++++++++++++++++++ drivers/pci/pcie/pme/Makefile | 5 - drivers/pci/pcie/pme/pcie_pme.c | 462 ---------------------------------------- 4 files changed, 463 insertions(+), 468 deletions(-) create mode 100644 drivers/pci/pcie/pme.c delete mode 100644 drivers/pci/pcie/pme/Makefile delete mode 100644 drivers/pci/pcie/pme/pcie_pme.c (limited to 'drivers/pci/pcie') diff --git a/drivers/pci/pcie/Makefile b/drivers/pci/pcie/Makefile index 4d2b18704c47..00c62df5a9fc 100644 --- a/drivers/pci/pcie/Makefile +++ b/drivers/pci/pcie/Makefile @@ -13,4 +13,4 @@ obj-$(CONFIG_PCIEPORTBUS) += pcieportdrv.o # Build PCI Express AER if needed obj-$(CONFIG_PCIEAER) += aer/ -obj-$(CONFIG_PCIE_PME) += pme/ +obj-$(CONFIG_PCIE_PME) += pme.o diff --git a/drivers/pci/pcie/pme.c b/drivers/pci/pcie/pme.c new file mode 100644 index 000000000000..2f3c90407227 --- /dev/null +++ b/drivers/pci/pcie/pme.c @@ -0,0 +1,462 @@ +/* + * PCIe Native PME support + * + * Copyright (C) 2007 - 2009 Intel Corp + * Copyright (C) 2007 - 2009 Shaohua Li + * Copyright (C) 2009 Rafael J. Wysocki , 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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); diff --git a/drivers/pci/pcie/pme/Makefile b/drivers/pci/pcie/pme/Makefile deleted file mode 100644 index 3c67bf4d26cf..000000000000 --- a/drivers/pci/pcie/pme/Makefile +++ /dev/null @@ -1,5 +0,0 @@ -# -# Makefile for PCI-Express Root Port PME signaling driver -# - -obj-$(CONFIG_PCIE_PME) += pcie_pme.o 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 - * Copyright (C) 2009 Rafael J. Wysocki , 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 -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#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); -- cgit v1.2.2