![Bjorn Helgaas](/assets/img/avatar_default.png)
* pci/konstantin-runtime-pm: PCI/PM: Clear state_saved during suspend PCI: Use atomic_inc_return() rather than atomic_add_return() PCI: Catch attempts to disable already-disabled devices PCI: Disable Bus Master unconditionally in pci_device_shutdown()
1300 lines
31 KiB
C
1300 lines
31 KiB
C
/*
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* drivers/pci/pci-driver.c
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*
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* (C) Copyright 2002-2004, 2007 Greg Kroah-Hartman <greg@kroah.com>
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* (C) Copyright 2007 Novell Inc.
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*
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* Released under the GPL v2 only.
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*
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*/
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#include <linux/pci.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/mempolicy.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/cpu.h>
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#include <linux/pm_runtime.h>
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#include <linux/suspend.h>
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#include "pci.h"
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struct pci_dynid {
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struct list_head node;
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struct pci_device_id id;
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};
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/**
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* pci_add_dynid - add a new PCI device ID to this driver and re-probe devices
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* @drv: target pci driver
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* @vendor: PCI vendor ID
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* @device: PCI device ID
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* @subvendor: PCI subvendor ID
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* @subdevice: PCI subdevice ID
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* @class: PCI class
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* @class_mask: PCI class mask
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* @driver_data: private driver data
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*
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* Adds a new dynamic pci device ID to this driver and causes the
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* driver to probe for all devices again. @drv must have been
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* registered prior to calling this function.
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*
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* CONTEXT:
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* Does GFP_KERNEL allocation.
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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*/
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int pci_add_dynid(struct pci_driver *drv,
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unsigned int vendor, unsigned int device,
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unsigned int subvendor, unsigned int subdevice,
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unsigned int class, unsigned int class_mask,
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unsigned long driver_data)
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{
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struct pci_dynid *dynid;
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int retval;
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dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
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if (!dynid)
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return -ENOMEM;
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dynid->id.vendor = vendor;
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dynid->id.device = device;
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dynid->id.subvendor = subvendor;
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dynid->id.subdevice = subdevice;
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dynid->id.class = class;
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dynid->id.class_mask = class_mask;
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dynid->id.driver_data = driver_data;
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spin_lock(&drv->dynids.lock);
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list_add_tail(&dynid->node, &drv->dynids.list);
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spin_unlock(&drv->dynids.lock);
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retval = driver_attach(&drv->driver);
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return retval;
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}
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static void pci_free_dynids(struct pci_driver *drv)
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{
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struct pci_dynid *dynid, *n;
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spin_lock(&drv->dynids.lock);
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list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
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list_del(&dynid->node);
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kfree(dynid);
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}
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spin_unlock(&drv->dynids.lock);
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}
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/**
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* store_new_id - sysfs frontend to pci_add_dynid()
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* @driver: target device driver
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* @buf: buffer for scanning device ID data
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* @count: input size
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*
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* Allow PCI IDs to be added to an existing driver via sysfs.
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*/
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static ssize_t
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store_new_id(struct device_driver *driver, const char *buf, size_t count)
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{
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struct pci_driver *pdrv = to_pci_driver(driver);
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const struct pci_device_id *ids = pdrv->id_table;
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__u32 vendor, device, subvendor=PCI_ANY_ID,
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subdevice=PCI_ANY_ID, class=0, class_mask=0;
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unsigned long driver_data=0;
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int fields=0;
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int retval;
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fields = sscanf(buf, "%x %x %x %x %x %x %lx",
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&vendor, &device, &subvendor, &subdevice,
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&class, &class_mask, &driver_data);
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if (fields < 2)
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return -EINVAL;
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/* Only accept driver_data values that match an existing id_table
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entry */
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if (ids) {
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retval = -EINVAL;
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while (ids->vendor || ids->subvendor || ids->class_mask) {
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if (driver_data == ids->driver_data) {
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retval = 0;
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break;
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}
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ids++;
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}
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if (retval) /* No match */
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return retval;
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}
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retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
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class, class_mask, driver_data);
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if (retval)
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return retval;
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return count;
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}
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/**
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* store_remove_id - remove a PCI device ID from this driver
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* @driver: target device driver
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* @buf: buffer for scanning device ID data
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* @count: input size
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*
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* Removes a dynamic pci device ID to this driver.
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*/
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static ssize_t
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store_remove_id(struct device_driver *driver, const char *buf, size_t count)
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{
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struct pci_dynid *dynid, *n;
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struct pci_driver *pdrv = to_pci_driver(driver);
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__u32 vendor, device, subvendor = PCI_ANY_ID,
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subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
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int fields = 0;
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int retval = -ENODEV;
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fields = sscanf(buf, "%x %x %x %x %x %x",
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&vendor, &device, &subvendor, &subdevice,
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&class, &class_mask);
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if (fields < 2)
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return -EINVAL;
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spin_lock(&pdrv->dynids.lock);
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list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
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struct pci_device_id *id = &dynid->id;
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if ((id->vendor == vendor) &&
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(id->device == device) &&
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(subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
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(subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
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!((id->class ^ class) & class_mask)) {
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list_del(&dynid->node);
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kfree(dynid);
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retval = 0;
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break;
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}
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}
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spin_unlock(&pdrv->dynids.lock);
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if (retval)
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return retval;
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return count;
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}
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static struct driver_attribute pci_drv_attrs[] = {
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__ATTR(new_id, S_IWUSR, NULL, store_new_id),
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__ATTR(remove_id, S_IWUSR, NULL, store_remove_id),
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__ATTR_NULL,
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};
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/**
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* pci_match_id - See if a pci device matches a given pci_id table
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* @ids: array of PCI device id structures to search in
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* @dev: the PCI device structure to match against.
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*
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* Used by a driver to check whether a PCI device present in the
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* system is in its list of supported devices. Returns the matching
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* pci_device_id structure or %NULL if there is no match.
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*
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* Deprecated, don't use this as it will not catch any dynamic ids
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* that a driver might want to check for.
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*/
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const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
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struct pci_dev *dev)
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{
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if (ids) {
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while (ids->vendor || ids->subvendor || ids->class_mask) {
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if (pci_match_one_device(ids, dev))
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return ids;
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ids++;
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}
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}
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return NULL;
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}
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/**
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* pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
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* @drv: the PCI driver to match against
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* @dev: the PCI device structure to match against
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*
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* Used by a driver to check whether a PCI device present in the
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* system is in its list of supported devices. Returns the matching
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* pci_device_id structure or %NULL if there is no match.
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*/
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static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
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struct pci_dev *dev)
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{
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struct pci_dynid *dynid;
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/* Look at the dynamic ids first, before the static ones */
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spin_lock(&drv->dynids.lock);
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list_for_each_entry(dynid, &drv->dynids.list, node) {
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if (pci_match_one_device(&dynid->id, dev)) {
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spin_unlock(&drv->dynids.lock);
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return &dynid->id;
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}
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}
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spin_unlock(&drv->dynids.lock);
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return pci_match_id(drv->id_table, dev);
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}
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struct drv_dev_and_id {
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struct pci_driver *drv;
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struct pci_dev *dev;
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const struct pci_device_id *id;
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};
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static long local_pci_probe(void *_ddi)
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{
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struct drv_dev_and_id *ddi = _ddi;
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struct pci_dev *pci_dev = ddi->dev;
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struct pci_driver *pci_drv = ddi->drv;
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struct device *dev = &pci_dev->dev;
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int rc;
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/*
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* Unbound PCI devices are always put in D0, regardless of
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* runtime PM status. During probe, the device is set to
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* active and the usage count is incremented. If the driver
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* supports runtime PM, it should call pm_runtime_put_noidle()
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* in its probe routine and pm_runtime_get_noresume() in its
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* remove routine.
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*/
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pm_runtime_get_sync(dev);
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pci_dev->driver = pci_drv;
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rc = pci_drv->probe(pci_dev, ddi->id);
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if (rc) {
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pci_dev->driver = NULL;
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pm_runtime_put_sync(dev);
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}
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return rc;
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}
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static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
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const struct pci_device_id *id)
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{
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int error, node;
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struct drv_dev_and_id ddi = { drv, dev, id };
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/* Execute driver initialization on node where the device's
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bus is attached to. This way the driver likely allocates
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its local memory on the right node without any need to
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change it. */
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node = dev_to_node(&dev->dev);
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if (node >= 0) {
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int cpu;
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get_online_cpus();
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cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
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if (cpu < nr_cpu_ids)
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error = work_on_cpu(cpu, local_pci_probe, &ddi);
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else
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error = local_pci_probe(&ddi);
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put_online_cpus();
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} else
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error = local_pci_probe(&ddi);
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return error;
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}
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/**
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* __pci_device_probe - check if a driver wants to claim a specific PCI device
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* @drv: driver to call to check if it wants the PCI device
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* @pci_dev: PCI device being probed
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*
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* returns 0 on success, else error.
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* side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
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*/
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static int
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__pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
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{
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const struct pci_device_id *id;
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int error = 0;
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if (!pci_dev->driver && drv->probe) {
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error = -ENODEV;
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id = pci_match_device(drv, pci_dev);
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if (id)
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error = pci_call_probe(drv, pci_dev, id);
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if (error >= 0)
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error = 0;
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}
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return error;
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}
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static int pci_device_probe(struct device * dev)
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{
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int error = 0;
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struct pci_driver *drv;
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struct pci_dev *pci_dev;
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drv = to_pci_driver(dev->driver);
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pci_dev = to_pci_dev(dev);
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pci_dev_get(pci_dev);
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error = __pci_device_probe(drv, pci_dev);
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if (error)
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pci_dev_put(pci_dev);
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return error;
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}
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static int pci_device_remove(struct device * dev)
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{
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struct pci_dev * pci_dev = to_pci_dev(dev);
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struct pci_driver * drv = pci_dev->driver;
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if (drv) {
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if (drv->remove) {
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pm_runtime_get_sync(dev);
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drv->remove(pci_dev);
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pm_runtime_put_noidle(dev);
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}
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pci_dev->driver = NULL;
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}
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/* Undo the runtime PM settings in local_pci_probe() */
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pm_runtime_put_sync(dev);
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/*
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* If the device is still on, set the power state as "unknown",
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* since it might change by the next time we load the driver.
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*/
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if (pci_dev->current_state == PCI_D0)
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pci_dev->current_state = PCI_UNKNOWN;
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/*
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* We would love to complain here if pci_dev->is_enabled is set, that
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* the driver should have called pci_disable_device(), but the
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* unfortunate fact is there are too many odd BIOS and bridge setups
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* that don't like drivers doing that all of the time.
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* Oh well, we can dream of sane hardware when we sleep, no matter how
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* horrible the crap we have to deal with is when we are awake...
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*/
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pci_dev_put(pci_dev);
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return 0;
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}
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static void pci_device_shutdown(struct device *dev)
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{
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struct pci_dev *pci_dev = to_pci_dev(dev);
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struct pci_driver *drv = pci_dev->driver;
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pm_runtime_resume(dev);
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if (drv && drv->shutdown)
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drv->shutdown(pci_dev);
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pci_msi_shutdown(pci_dev);
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pci_msix_shutdown(pci_dev);
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/*
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* Turn off Bus Master bit on the device to tell it to not
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* continue to do DMA
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*/
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pci_clear_master(pci_dev);
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}
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#ifdef CONFIG_PM
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/* Auxiliary functions used for system resume and run-time resume. */
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/**
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* pci_restore_standard_config - restore standard config registers of PCI device
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* @pci_dev: PCI device to handle
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*/
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static int pci_restore_standard_config(struct pci_dev *pci_dev)
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{
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pci_update_current_state(pci_dev, PCI_UNKNOWN);
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if (pci_dev->current_state != PCI_D0) {
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int error = pci_set_power_state(pci_dev, PCI_D0);
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if (error)
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return error;
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}
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pci_restore_state(pci_dev);
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return 0;
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}
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#endif
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#ifdef CONFIG_PM_SLEEP
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static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
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{
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pci_power_up(pci_dev);
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pci_restore_state(pci_dev);
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pci_fixup_device(pci_fixup_resume_early, pci_dev);
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}
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/*
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* Default "suspend" method for devices that have no driver provided suspend,
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* or not even a driver at all (second part).
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*/
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static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
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{
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/*
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* mark its power state as "unknown", since we don't know if
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* e.g. the BIOS will change its device state when we suspend.
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*/
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if (pci_dev->current_state == PCI_D0)
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pci_dev->current_state = PCI_UNKNOWN;
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}
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/*
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* Default "resume" method for devices that have no driver provided resume,
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* or not even a driver at all (second part).
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*/
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static int pci_pm_reenable_device(struct pci_dev *pci_dev)
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{
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int retval;
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/* if the device was enabled before suspend, reenable */
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retval = pci_reenable_device(pci_dev);
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/*
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* if the device was busmaster before the suspend, make it busmaster
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* again
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*/
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if (pci_dev->is_busmaster)
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pci_set_master(pci_dev);
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return retval;
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}
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static int pci_legacy_suspend(struct device *dev, pm_message_t state)
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{
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struct pci_dev * pci_dev = to_pci_dev(dev);
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struct pci_driver * drv = pci_dev->driver;
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if (drv && drv->suspend) {
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pci_power_t prev = pci_dev->current_state;
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int error;
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error = drv->suspend(pci_dev, state);
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suspend_report_result(drv->suspend, error);
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if (error)
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return error;
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if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
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&& pci_dev->current_state != PCI_UNKNOWN) {
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WARN_ONCE(pci_dev->current_state != prev,
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"PCI PM: Device state not saved by %pF\n",
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drv->suspend);
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}
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}
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pci_fixup_device(pci_fixup_suspend, pci_dev);
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return 0;
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}
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static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
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{
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struct pci_dev * pci_dev = to_pci_dev(dev);
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struct pci_driver * drv = pci_dev->driver;
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if (drv && drv->suspend_late) {
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pci_power_t prev = pci_dev->current_state;
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int error;
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error = drv->suspend_late(pci_dev, state);
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suspend_report_result(drv->suspend_late, error);
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if (error)
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return error;
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if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
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&& pci_dev->current_state != PCI_UNKNOWN) {
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WARN_ONCE(pci_dev->current_state != prev,
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"PCI PM: Device state not saved by %pF\n",
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drv->suspend_late);
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return 0;
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}
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}
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if (!pci_dev->state_saved)
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pci_save_state(pci_dev);
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|
|
|
pci_pm_set_unknown_state(pci_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pci_legacy_resume_early(struct device *dev)
|
|
{
|
|
struct pci_dev * pci_dev = to_pci_dev(dev);
|
|
struct pci_driver * drv = pci_dev->driver;
|
|
|
|
return drv && drv->resume_early ?
|
|
drv->resume_early(pci_dev) : 0;
|
|
}
|
|
|
|
static int pci_legacy_resume(struct device *dev)
|
|
{
|
|
struct pci_dev * pci_dev = to_pci_dev(dev);
|
|
struct pci_driver * drv = pci_dev->driver;
|
|
|
|
pci_fixup_device(pci_fixup_resume, pci_dev);
|
|
|
|
return drv && drv->resume ?
|
|
drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
|
|
}
|
|
|
|
/* Auxiliary functions used by the new power management framework */
|
|
|
|
static void pci_pm_default_resume(struct pci_dev *pci_dev)
|
|
{
|
|
pci_fixup_device(pci_fixup_resume, pci_dev);
|
|
|
|
if (!pci_is_bridge(pci_dev))
|
|
pci_enable_wake(pci_dev, PCI_D0, false);
|
|
}
|
|
|
|
static void pci_pm_default_suspend(struct pci_dev *pci_dev)
|
|
{
|
|
/* Disable non-bridge devices without PM support */
|
|
if (!pci_is_bridge(pci_dev))
|
|
pci_disable_enabled_device(pci_dev);
|
|
}
|
|
|
|
static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
|
|
{
|
|
struct pci_driver *drv = pci_dev->driver;
|
|
bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
|
|
|| drv->resume_early);
|
|
|
|
/*
|
|
* Legacy PM support is used by default, so warn if the new framework is
|
|
* supported as well. Drivers are supposed to support either the
|
|
* former, or the latter, but not both at the same time.
|
|
*/
|
|
WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n",
|
|
drv->name, pci_dev->vendor, pci_dev->device);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* New power management framework */
|
|
|
|
static int pci_pm_prepare(struct device *dev)
|
|
{
|
|
struct device_driver *drv = dev->driver;
|
|
int error = 0;
|
|
|
|
/*
|
|
* PCI devices suspended at run time need to be resumed at this
|
|
* point, because in general it is necessary to reconfigure them for
|
|
* system suspend. Namely, if the device is supposed to wake up the
|
|
* system from the sleep state, we may need to reconfigure it for this
|
|
* purpose. In turn, if the device is not supposed to wake up the
|
|
* system from the sleep state, we'll have to prevent it from signaling
|
|
* wake-up.
|
|
*/
|
|
pm_runtime_resume(dev);
|
|
|
|
if (drv && drv->pm && drv->pm->prepare)
|
|
error = drv->pm->prepare(dev);
|
|
|
|
return error;
|
|
}
|
|
|
|
static void pci_pm_complete(struct device *dev)
|
|
{
|
|
struct device_driver *drv = dev->driver;
|
|
|
|
if (drv && drv->pm && drv->pm->complete)
|
|
drv->pm->complete(dev);
|
|
}
|
|
|
|
#else /* !CONFIG_PM_SLEEP */
|
|
|
|
#define pci_pm_prepare NULL
|
|
#define pci_pm_complete NULL
|
|
|
|
#endif /* !CONFIG_PM_SLEEP */
|
|
|
|
#ifdef CONFIG_SUSPEND
|
|
|
|
static int pci_pm_suspend(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
|
|
|
|
if (pci_has_legacy_pm_support(pci_dev))
|
|
return pci_legacy_suspend(dev, PMSG_SUSPEND);
|
|
|
|
if (!pm) {
|
|
pci_pm_default_suspend(pci_dev);
|
|
goto Fixup;
|
|
}
|
|
|
|
pci_dev->state_saved = false;
|
|
if (pm->suspend) {
|
|
pci_power_t prev = pci_dev->current_state;
|
|
int error;
|
|
|
|
error = pm->suspend(dev);
|
|
suspend_report_result(pm->suspend, error);
|
|
if (error)
|
|
return error;
|
|
|
|
if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
|
|
&& pci_dev->current_state != PCI_UNKNOWN) {
|
|
WARN_ONCE(pci_dev->current_state != prev,
|
|
"PCI PM: State of device not saved by %pF\n",
|
|
pm->suspend);
|
|
}
|
|
}
|
|
|
|
Fixup:
|
|
pci_fixup_device(pci_fixup_suspend, pci_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pci_pm_suspend_noirq(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
|
|
|
|
if (pci_has_legacy_pm_support(pci_dev))
|
|
return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
|
|
|
|
if (!pm) {
|
|
pci_save_state(pci_dev);
|
|
return 0;
|
|
}
|
|
|
|
if (pm->suspend_noirq) {
|
|
pci_power_t prev = pci_dev->current_state;
|
|
int error;
|
|
|
|
error = pm->suspend_noirq(dev);
|
|
suspend_report_result(pm->suspend_noirq, error);
|
|
if (error)
|
|
return error;
|
|
|
|
if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
|
|
&& pci_dev->current_state != PCI_UNKNOWN) {
|
|
WARN_ONCE(pci_dev->current_state != prev,
|
|
"PCI PM: State of device not saved by %pF\n",
|
|
pm->suspend_noirq);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (!pci_dev->state_saved) {
|
|
pci_save_state(pci_dev);
|
|
if (!pci_is_bridge(pci_dev))
|
|
pci_prepare_to_sleep(pci_dev);
|
|
}
|
|
|
|
pci_pm_set_unknown_state(pci_dev);
|
|
|
|
/*
|
|
* Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
|
|
* PCI COMMAND register isn't 0, the BIOS assumes that the controller
|
|
* hasn't been quiesced and tries to turn it off. If the controller
|
|
* is already in D3, this can hang or cause memory corruption.
|
|
*
|
|
* Since the value of the COMMAND register doesn't matter once the
|
|
* device has been suspended, we can safely set it to 0 here.
|
|
*/
|
|
if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
|
|
pci_write_config_word(pci_dev, PCI_COMMAND, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pci_pm_resume_noirq(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
struct device_driver *drv = dev->driver;
|
|
int error = 0;
|
|
|
|
pci_pm_default_resume_early(pci_dev);
|
|
|
|
if (pci_has_legacy_pm_support(pci_dev))
|
|
return pci_legacy_resume_early(dev);
|
|
|
|
if (drv && drv->pm && drv->pm->resume_noirq)
|
|
error = drv->pm->resume_noirq(dev);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int pci_pm_resume(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
|
|
int error = 0;
|
|
|
|
/*
|
|
* This is necessary for the suspend error path in which resume is
|
|
* called without restoring the standard config registers of the device.
|
|
*/
|
|
if (pci_dev->state_saved)
|
|
pci_restore_standard_config(pci_dev);
|
|
|
|
if (pci_has_legacy_pm_support(pci_dev))
|
|
return pci_legacy_resume(dev);
|
|
|
|
pci_pm_default_resume(pci_dev);
|
|
|
|
if (pm) {
|
|
if (pm->resume)
|
|
error = pm->resume(dev);
|
|
} else {
|
|
pci_pm_reenable_device(pci_dev);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
#else /* !CONFIG_SUSPEND */
|
|
|
|
#define pci_pm_suspend NULL
|
|
#define pci_pm_suspend_noirq NULL
|
|
#define pci_pm_resume NULL
|
|
#define pci_pm_resume_noirq NULL
|
|
|
|
#endif /* !CONFIG_SUSPEND */
|
|
|
|
#ifdef CONFIG_HIBERNATE_CALLBACKS
|
|
|
|
static int pci_pm_freeze(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
|
|
|
|
if (pci_has_legacy_pm_support(pci_dev))
|
|
return pci_legacy_suspend(dev, PMSG_FREEZE);
|
|
|
|
if (!pm) {
|
|
pci_pm_default_suspend(pci_dev);
|
|
return 0;
|
|
}
|
|
|
|
pci_dev->state_saved = false;
|
|
if (pm->freeze) {
|
|
int error;
|
|
|
|
error = pm->freeze(dev);
|
|
suspend_report_result(pm->freeze, error);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pci_pm_freeze_noirq(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
struct device_driver *drv = dev->driver;
|
|
|
|
if (pci_has_legacy_pm_support(pci_dev))
|
|
return pci_legacy_suspend_late(dev, PMSG_FREEZE);
|
|
|
|
if (drv && drv->pm && drv->pm->freeze_noirq) {
|
|
int error;
|
|
|
|
error = drv->pm->freeze_noirq(dev);
|
|
suspend_report_result(drv->pm->freeze_noirq, error);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
if (!pci_dev->state_saved)
|
|
pci_save_state(pci_dev);
|
|
|
|
pci_pm_set_unknown_state(pci_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pci_pm_thaw_noirq(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
struct device_driver *drv = dev->driver;
|
|
int error = 0;
|
|
|
|
if (pci_has_legacy_pm_support(pci_dev))
|
|
return pci_legacy_resume_early(dev);
|
|
|
|
pci_update_current_state(pci_dev, PCI_D0);
|
|
|
|
if (drv && drv->pm && drv->pm->thaw_noirq)
|
|
error = drv->pm->thaw_noirq(dev);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int pci_pm_thaw(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
|
|
int error = 0;
|
|
|
|
if (pci_has_legacy_pm_support(pci_dev))
|
|
return pci_legacy_resume(dev);
|
|
|
|
if (pm) {
|
|
if (pm->thaw)
|
|
error = pm->thaw(dev);
|
|
} else {
|
|
pci_pm_reenable_device(pci_dev);
|
|
}
|
|
|
|
pci_dev->state_saved = false;
|
|
|
|
return error;
|
|
}
|
|
|
|
static int pci_pm_poweroff(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
|
|
|
|
if (pci_has_legacy_pm_support(pci_dev))
|
|
return pci_legacy_suspend(dev, PMSG_HIBERNATE);
|
|
|
|
if (!pm) {
|
|
pci_pm_default_suspend(pci_dev);
|
|
goto Fixup;
|
|
}
|
|
|
|
pci_dev->state_saved = false;
|
|
if (pm->poweroff) {
|
|
int error;
|
|
|
|
error = pm->poweroff(dev);
|
|
suspend_report_result(pm->poweroff, error);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
Fixup:
|
|
pci_fixup_device(pci_fixup_suspend, pci_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pci_pm_poweroff_noirq(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
struct device_driver *drv = dev->driver;
|
|
|
|
if (pci_has_legacy_pm_support(to_pci_dev(dev)))
|
|
return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
|
|
|
|
if (!drv || !drv->pm)
|
|
return 0;
|
|
|
|
if (drv->pm->poweroff_noirq) {
|
|
int error;
|
|
|
|
error = drv->pm->poweroff_noirq(dev);
|
|
suspend_report_result(drv->pm->poweroff_noirq, error);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
if (!pci_dev->state_saved && !pci_is_bridge(pci_dev))
|
|
pci_prepare_to_sleep(pci_dev);
|
|
|
|
/*
|
|
* The reason for doing this here is the same as for the analogous code
|
|
* in pci_pm_suspend_noirq().
|
|
*/
|
|
if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
|
|
pci_write_config_word(pci_dev, PCI_COMMAND, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pci_pm_restore_noirq(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
struct device_driver *drv = dev->driver;
|
|
int error = 0;
|
|
|
|
pci_pm_default_resume_early(pci_dev);
|
|
|
|
if (pci_has_legacy_pm_support(pci_dev))
|
|
return pci_legacy_resume_early(dev);
|
|
|
|
if (drv && drv->pm && drv->pm->restore_noirq)
|
|
error = drv->pm->restore_noirq(dev);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int pci_pm_restore(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
|
|
int error = 0;
|
|
|
|
/*
|
|
* This is necessary for the hibernation error path in which restore is
|
|
* called without restoring the standard config registers of the device.
|
|
*/
|
|
if (pci_dev->state_saved)
|
|
pci_restore_standard_config(pci_dev);
|
|
|
|
if (pci_has_legacy_pm_support(pci_dev))
|
|
return pci_legacy_resume(dev);
|
|
|
|
pci_pm_default_resume(pci_dev);
|
|
|
|
if (pm) {
|
|
if (pm->restore)
|
|
error = pm->restore(dev);
|
|
} else {
|
|
pci_pm_reenable_device(pci_dev);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
#else /* !CONFIG_HIBERNATE_CALLBACKS */
|
|
|
|
#define pci_pm_freeze NULL
|
|
#define pci_pm_freeze_noirq NULL
|
|
#define pci_pm_thaw NULL
|
|
#define pci_pm_thaw_noirq NULL
|
|
#define pci_pm_poweroff NULL
|
|
#define pci_pm_poweroff_noirq NULL
|
|
#define pci_pm_restore NULL
|
|
#define pci_pm_restore_noirq NULL
|
|
|
|
#endif /* !CONFIG_HIBERNATE_CALLBACKS */
|
|
|
|
#ifdef CONFIG_PM_RUNTIME
|
|
|
|
static int pci_pm_runtime_suspend(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
|
|
pci_power_t prev = pci_dev->current_state;
|
|
int error;
|
|
|
|
/*
|
|
* If pci_dev->driver is not set (unbound), the device should
|
|
* always remain in D0 regardless of the runtime PM status
|
|
*/
|
|
if (!pci_dev->driver)
|
|
return 0;
|
|
|
|
if (!pm || !pm->runtime_suspend)
|
|
return -ENOSYS;
|
|
|
|
pci_dev->state_saved = false;
|
|
pci_dev->no_d3cold = false;
|
|
error = pm->runtime_suspend(dev);
|
|
suspend_report_result(pm->runtime_suspend, error);
|
|
if (error)
|
|
return error;
|
|
if (!pci_dev->d3cold_allowed)
|
|
pci_dev->no_d3cold = true;
|
|
|
|
pci_fixup_device(pci_fixup_suspend, pci_dev);
|
|
|
|
if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
|
|
&& pci_dev->current_state != PCI_UNKNOWN) {
|
|
WARN_ONCE(pci_dev->current_state != prev,
|
|
"PCI PM: State of device not saved by %pF\n",
|
|
pm->runtime_suspend);
|
|
return 0;
|
|
}
|
|
|
|
if (!pci_dev->state_saved) {
|
|
pci_save_state(pci_dev);
|
|
pci_finish_runtime_suspend(pci_dev);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pci_pm_runtime_resume(struct device *dev)
|
|
{
|
|
int rc;
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
|
|
|
|
/*
|
|
* If pci_dev->driver is not set (unbound), the device should
|
|
* always remain in D0 regardless of the runtime PM status
|
|
*/
|
|
if (!pci_dev->driver)
|
|
return 0;
|
|
|
|
if (!pm || !pm->runtime_resume)
|
|
return -ENOSYS;
|
|
|
|
pci_restore_standard_config(pci_dev);
|
|
pci_fixup_device(pci_fixup_resume_early, pci_dev);
|
|
__pci_enable_wake(pci_dev, PCI_D0, true, false);
|
|
pci_fixup_device(pci_fixup_resume, pci_dev);
|
|
|
|
rc = pm->runtime_resume(dev);
|
|
|
|
pci_dev->runtime_d3cold = false;
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int pci_pm_runtime_idle(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
|
|
|
|
/*
|
|
* If pci_dev->driver is not set (unbound), the device should
|
|
* always remain in D0 regardless of the runtime PM status
|
|
*/
|
|
if (!pci_dev->driver)
|
|
goto out;
|
|
|
|
if (!pm)
|
|
return -ENOSYS;
|
|
|
|
if (pm->runtime_idle) {
|
|
int ret = pm->runtime_idle(dev);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
out:
|
|
pm_runtime_suspend(dev);
|
|
return 0;
|
|
}
|
|
|
|
#else /* !CONFIG_PM_RUNTIME */
|
|
|
|
#define pci_pm_runtime_suspend NULL
|
|
#define pci_pm_runtime_resume NULL
|
|
#define pci_pm_runtime_idle NULL
|
|
|
|
#endif /* !CONFIG_PM_RUNTIME */
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
const struct dev_pm_ops pci_dev_pm_ops = {
|
|
.prepare = pci_pm_prepare,
|
|
.complete = pci_pm_complete,
|
|
.suspend = pci_pm_suspend,
|
|
.resume = pci_pm_resume,
|
|
.freeze = pci_pm_freeze,
|
|
.thaw = pci_pm_thaw,
|
|
.poweroff = pci_pm_poweroff,
|
|
.restore = pci_pm_restore,
|
|
.suspend_noirq = pci_pm_suspend_noirq,
|
|
.resume_noirq = pci_pm_resume_noirq,
|
|
.freeze_noirq = pci_pm_freeze_noirq,
|
|
.thaw_noirq = pci_pm_thaw_noirq,
|
|
.poweroff_noirq = pci_pm_poweroff_noirq,
|
|
.restore_noirq = pci_pm_restore_noirq,
|
|
.runtime_suspend = pci_pm_runtime_suspend,
|
|
.runtime_resume = pci_pm_runtime_resume,
|
|
.runtime_idle = pci_pm_runtime_idle,
|
|
};
|
|
|
|
#define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
|
|
|
|
#else /* !COMFIG_PM_OPS */
|
|
|
|
#define PCI_PM_OPS_PTR NULL
|
|
|
|
#endif /* !COMFIG_PM_OPS */
|
|
|
|
/**
|
|
* __pci_register_driver - register a new pci driver
|
|
* @drv: the driver structure to register
|
|
* @owner: owner module of drv
|
|
* @mod_name: module name string
|
|
*
|
|
* Adds the driver structure to the list of registered drivers.
|
|
* Returns a negative value on error, otherwise 0.
|
|
* If no error occurred, the driver remains registered even if
|
|
* no device was claimed during registration.
|
|
*/
|
|
int __pci_register_driver(struct pci_driver *drv, struct module *owner,
|
|
const char *mod_name)
|
|
{
|
|
/* initialize common driver fields */
|
|
drv->driver.name = drv->name;
|
|
drv->driver.bus = &pci_bus_type;
|
|
drv->driver.owner = owner;
|
|
drv->driver.mod_name = mod_name;
|
|
|
|
spin_lock_init(&drv->dynids.lock);
|
|
INIT_LIST_HEAD(&drv->dynids.list);
|
|
|
|
/* register with core */
|
|
return driver_register(&drv->driver);
|
|
}
|
|
|
|
/**
|
|
* pci_unregister_driver - unregister a pci driver
|
|
* @drv: the driver structure to unregister
|
|
*
|
|
* Deletes the driver structure from the list of registered PCI drivers,
|
|
* gives it a chance to clean up by calling its remove() function for
|
|
* each device it was responsible for, and marks those devices as
|
|
* driverless.
|
|
*/
|
|
|
|
void
|
|
pci_unregister_driver(struct pci_driver *drv)
|
|
{
|
|
driver_unregister(&drv->driver);
|
|
pci_free_dynids(drv);
|
|
}
|
|
|
|
static struct pci_driver pci_compat_driver = {
|
|
.name = "compat"
|
|
};
|
|
|
|
/**
|
|
* pci_dev_driver - get the pci_driver of a device
|
|
* @dev: the device to query
|
|
*
|
|
* Returns the appropriate pci_driver structure or %NULL if there is no
|
|
* registered driver for the device.
|
|
*/
|
|
struct pci_driver *
|
|
pci_dev_driver(const struct pci_dev *dev)
|
|
{
|
|
if (dev->driver)
|
|
return dev->driver;
|
|
else {
|
|
int i;
|
|
for(i=0; i<=PCI_ROM_RESOURCE; i++)
|
|
if (dev->resource[i].flags & IORESOURCE_BUSY)
|
|
return &pci_compat_driver;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
|
|
* @dev: the PCI device structure to match against
|
|
* @drv: the device driver to search for matching PCI device id structures
|
|
*
|
|
* Used by a driver to check whether a PCI device present in the
|
|
* system is in its list of supported devices. Returns the matching
|
|
* pci_device_id structure or %NULL if there is no match.
|
|
*/
|
|
static int pci_bus_match(struct device *dev, struct device_driver *drv)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
struct pci_driver *pci_drv;
|
|
const struct pci_device_id *found_id;
|
|
|
|
if (!pci_dev->match_driver)
|
|
return 0;
|
|
|
|
pci_drv = to_pci_driver(drv);
|
|
found_id = pci_match_device(pci_drv, pci_dev);
|
|
if (found_id)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_dev_get - increments the reference count of the pci device structure
|
|
* @dev: the device being referenced
|
|
*
|
|
* Each live reference to a device should be refcounted.
|
|
*
|
|
* Drivers for PCI devices should normally record such references in
|
|
* their probe() methods, when they bind to a device, and release
|
|
* them by calling pci_dev_put(), in their disconnect() methods.
|
|
*
|
|
* A pointer to the device with the incremented reference counter is returned.
|
|
*/
|
|
struct pci_dev *pci_dev_get(struct pci_dev *dev)
|
|
{
|
|
if (dev)
|
|
get_device(&dev->dev);
|
|
return dev;
|
|
}
|
|
|
|
/**
|
|
* pci_dev_put - release a use of the pci device structure
|
|
* @dev: device that's been disconnected
|
|
*
|
|
* Must be called when a user of a device is finished with it. When the last
|
|
* user of the device calls this function, the memory of the device is freed.
|
|
*/
|
|
void pci_dev_put(struct pci_dev *dev)
|
|
{
|
|
if (dev)
|
|
put_device(&dev->dev);
|
|
}
|
|
|
|
static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
struct pci_dev *pdev;
|
|
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
pdev = to_pci_dev(dev);
|
|
if (!pdev)
|
|
return -ENODEV;
|
|
|
|
if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
|
|
return -ENOMEM;
|
|
|
|
if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
|
|
return -ENOMEM;
|
|
|
|
if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
|
|
pdev->subsystem_device))
|
|
return -ENOMEM;
|
|
|
|
if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
|
|
return -ENOMEM;
|
|
|
|
if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x",
|
|
pdev->vendor, pdev->device,
|
|
pdev->subsystem_vendor, pdev->subsystem_device,
|
|
(u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
|
|
(u8)(pdev->class)))
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
struct bus_type pci_bus_type = {
|
|
.name = "pci",
|
|
.match = pci_bus_match,
|
|
.uevent = pci_uevent,
|
|
.probe = pci_device_probe,
|
|
.remove = pci_device_remove,
|
|
.shutdown = pci_device_shutdown,
|
|
.dev_attrs = pci_dev_attrs,
|
|
.bus_attrs = pci_bus_attrs,
|
|
.drv_attrs = pci_drv_attrs,
|
|
.pm = PCI_PM_OPS_PTR,
|
|
};
|
|
|
|
static int __init pci_driver_init(void)
|
|
{
|
|
return bus_register(&pci_bus_type);
|
|
}
|
|
|
|
postcore_initcall(pci_driver_init);
|
|
|
|
EXPORT_SYMBOL_GPL(pci_add_dynid);
|
|
EXPORT_SYMBOL(pci_match_id);
|
|
EXPORT_SYMBOL(__pci_register_driver);
|
|
EXPORT_SYMBOL(pci_unregister_driver);
|
|
EXPORT_SYMBOL(pci_dev_driver);
|
|
EXPORT_SYMBOL(pci_bus_type);
|
|
EXPORT_SYMBOL(pci_dev_get);
|
|
EXPORT_SYMBOL(pci_dev_put);
|