mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 16:38:12 +00:00
3f4f35678f
* pci/pm: PCI: Avoid unnecessary resume after direct-complete PCI: Recognize D3cold in pci_update_current_state() PCI: Query platform firmware for device power state PCI: Afford direct-complete to devices with non-standard PM
1453 lines
36 KiB
C
1453 lines
36 KiB
C
/*
|
|
* drivers/pci/pci-driver.c
|
|
*
|
|
* (C) Copyright 2002-2004, 2007 Greg Kroah-Hartman <greg@kroah.com>
|
|
* (C) Copyright 2007 Novell Inc.
|
|
*
|
|
* Released under the GPL v2 only.
|
|
*
|
|
*/
|
|
|
|
#include <linux/pci.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/device.h>
|
|
#include <linux/mempolicy.h>
|
|
#include <linux/string.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include <linux/suspend.h>
|
|
#include <linux/kexec.h>
|
|
#include "pci.h"
|
|
|
|
struct pci_dynid {
|
|
struct list_head node;
|
|
struct pci_device_id id;
|
|
};
|
|
|
|
/**
|
|
* pci_add_dynid - add a new PCI device ID to this driver and re-probe devices
|
|
* @drv: target pci driver
|
|
* @vendor: PCI vendor ID
|
|
* @device: PCI device ID
|
|
* @subvendor: PCI subvendor ID
|
|
* @subdevice: PCI subdevice ID
|
|
* @class: PCI class
|
|
* @class_mask: PCI class mask
|
|
* @driver_data: private driver data
|
|
*
|
|
* Adds a new dynamic pci device ID to this driver and causes the
|
|
* driver to probe for all devices again. @drv must have been
|
|
* registered prior to calling this function.
|
|
*
|
|
* CONTEXT:
|
|
* Does GFP_KERNEL allocation.
|
|
*
|
|
* RETURNS:
|
|
* 0 on success, -errno on failure.
|
|
*/
|
|
int pci_add_dynid(struct pci_driver *drv,
|
|
unsigned int vendor, unsigned int device,
|
|
unsigned int subvendor, unsigned int subdevice,
|
|
unsigned int class, unsigned int class_mask,
|
|
unsigned long driver_data)
|
|
{
|
|
struct pci_dynid *dynid;
|
|
|
|
dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
|
|
if (!dynid)
|
|
return -ENOMEM;
|
|
|
|
dynid->id.vendor = vendor;
|
|
dynid->id.device = device;
|
|
dynid->id.subvendor = subvendor;
|
|
dynid->id.subdevice = subdevice;
|
|
dynid->id.class = class;
|
|
dynid->id.class_mask = class_mask;
|
|
dynid->id.driver_data = driver_data;
|
|
|
|
spin_lock(&drv->dynids.lock);
|
|
list_add_tail(&dynid->node, &drv->dynids.list);
|
|
spin_unlock(&drv->dynids.lock);
|
|
|
|
return driver_attach(&drv->driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_add_dynid);
|
|
|
|
static void pci_free_dynids(struct pci_driver *drv)
|
|
{
|
|
struct pci_dynid *dynid, *n;
|
|
|
|
spin_lock(&drv->dynids.lock);
|
|
list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
|
|
list_del(&dynid->node);
|
|
kfree(dynid);
|
|
}
|
|
spin_unlock(&drv->dynids.lock);
|
|
}
|
|
|
|
/**
|
|
* store_new_id - sysfs frontend to pci_add_dynid()
|
|
* @driver: target device driver
|
|
* @buf: buffer for scanning device ID data
|
|
* @count: input size
|
|
*
|
|
* Allow PCI IDs to be added to an existing driver via sysfs.
|
|
*/
|
|
static ssize_t store_new_id(struct device_driver *driver, const char *buf,
|
|
size_t count)
|
|
{
|
|
struct pci_driver *pdrv = to_pci_driver(driver);
|
|
const struct pci_device_id *ids = pdrv->id_table;
|
|
__u32 vendor, device, subvendor = PCI_ANY_ID,
|
|
subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
|
|
unsigned long driver_data = 0;
|
|
int fields = 0;
|
|
int retval = 0;
|
|
|
|
fields = sscanf(buf, "%x %x %x %x %x %x %lx",
|
|
&vendor, &device, &subvendor, &subdevice,
|
|
&class, &class_mask, &driver_data);
|
|
if (fields < 2)
|
|
return -EINVAL;
|
|
|
|
if (fields != 7) {
|
|
struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
|
|
if (!pdev)
|
|
return -ENOMEM;
|
|
|
|
pdev->vendor = vendor;
|
|
pdev->device = device;
|
|
pdev->subsystem_vendor = subvendor;
|
|
pdev->subsystem_device = subdevice;
|
|
pdev->class = class;
|
|
|
|
if (pci_match_id(pdrv->id_table, pdev))
|
|
retval = -EEXIST;
|
|
|
|
kfree(pdev);
|
|
|
|
if (retval)
|
|
return retval;
|
|
}
|
|
|
|
/* Only accept driver_data values that match an existing id_table
|
|
entry */
|
|
if (ids) {
|
|
retval = -EINVAL;
|
|
while (ids->vendor || ids->subvendor || ids->class_mask) {
|
|
if (driver_data == ids->driver_data) {
|
|
retval = 0;
|
|
break;
|
|
}
|
|
ids++;
|
|
}
|
|
if (retval) /* No match */
|
|
return retval;
|
|
}
|
|
|
|
retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
|
|
class, class_mask, driver_data);
|
|
if (retval)
|
|
return retval;
|
|
return count;
|
|
}
|
|
static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
|
|
|
|
/**
|
|
* store_remove_id - remove a PCI device ID from this driver
|
|
* @driver: target device driver
|
|
* @buf: buffer for scanning device ID data
|
|
* @count: input size
|
|
*
|
|
* Removes a dynamic pci device ID to this driver.
|
|
*/
|
|
static ssize_t store_remove_id(struct device_driver *driver, const char *buf,
|
|
size_t count)
|
|
{
|
|
struct pci_dynid *dynid, *n;
|
|
struct pci_driver *pdrv = to_pci_driver(driver);
|
|
__u32 vendor, device, subvendor = PCI_ANY_ID,
|
|
subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
|
|
int fields = 0;
|
|
size_t retval = -ENODEV;
|
|
|
|
fields = sscanf(buf, "%x %x %x %x %x %x",
|
|
&vendor, &device, &subvendor, &subdevice,
|
|
&class, &class_mask);
|
|
if (fields < 2)
|
|
return -EINVAL;
|
|
|
|
spin_lock(&pdrv->dynids.lock);
|
|
list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
|
|
struct pci_device_id *id = &dynid->id;
|
|
if ((id->vendor == vendor) &&
|
|
(id->device == device) &&
|
|
(subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
|
|
(subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
|
|
!((id->class ^ class) & class_mask)) {
|
|
list_del(&dynid->node);
|
|
kfree(dynid);
|
|
retval = count;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&pdrv->dynids.lock);
|
|
|
|
return retval;
|
|
}
|
|
static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id);
|
|
|
|
static struct attribute *pci_drv_attrs[] = {
|
|
&driver_attr_new_id.attr,
|
|
&driver_attr_remove_id.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(pci_drv);
|
|
|
|
/**
|
|
* pci_match_id - See if a pci device matches a given pci_id table
|
|
* @ids: array of PCI device id structures to search in
|
|
* @dev: the PCI device structure to match against.
|
|
*
|
|
* 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.
|
|
*
|
|
* Deprecated, don't use this as it will not catch any dynamic ids
|
|
* that a driver might want to check for.
|
|
*/
|
|
const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
|
|
struct pci_dev *dev)
|
|
{
|
|
if (ids) {
|
|
while (ids->vendor || ids->subvendor || ids->class_mask) {
|
|
if (pci_match_one_device(ids, dev))
|
|
return ids;
|
|
ids++;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(pci_match_id);
|
|
|
|
static const struct pci_device_id pci_device_id_any = {
|
|
.vendor = PCI_ANY_ID,
|
|
.device = PCI_ANY_ID,
|
|
.subvendor = PCI_ANY_ID,
|
|
.subdevice = PCI_ANY_ID,
|
|
};
|
|
|
|
/**
|
|
* pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
|
|
* @drv: the PCI driver to match against
|
|
* @dev: the PCI device structure to match against
|
|
*
|
|
* 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 const struct pci_device_id *pci_match_device(struct pci_driver *drv,
|
|
struct pci_dev *dev)
|
|
{
|
|
struct pci_dynid *dynid;
|
|
const struct pci_device_id *found_id = NULL;
|
|
|
|
/* When driver_override is set, only bind to the matching driver */
|
|
if (dev->driver_override && strcmp(dev->driver_override, drv->name))
|
|
return NULL;
|
|
|
|
/* Look at the dynamic ids first, before the static ones */
|
|
spin_lock(&drv->dynids.lock);
|
|
list_for_each_entry(dynid, &drv->dynids.list, node) {
|
|
if (pci_match_one_device(&dynid->id, dev)) {
|
|
found_id = &dynid->id;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&drv->dynids.lock);
|
|
|
|
if (!found_id)
|
|
found_id = pci_match_id(drv->id_table, dev);
|
|
|
|
/* driver_override will always match, send a dummy id */
|
|
if (!found_id && dev->driver_override)
|
|
found_id = &pci_device_id_any;
|
|
|
|
return found_id;
|
|
}
|
|
|
|
struct drv_dev_and_id {
|
|
struct pci_driver *drv;
|
|
struct pci_dev *dev;
|
|
const struct pci_device_id *id;
|
|
};
|
|
|
|
static long local_pci_probe(void *_ddi)
|
|
{
|
|
struct drv_dev_and_id *ddi = _ddi;
|
|
struct pci_dev *pci_dev = ddi->dev;
|
|
struct pci_driver *pci_drv = ddi->drv;
|
|
struct device *dev = &pci_dev->dev;
|
|
int rc;
|
|
|
|
/*
|
|
* Unbound PCI devices are always put in D0, regardless of
|
|
* runtime PM status. During probe, the device is set to
|
|
* active and the usage count is incremented. If the driver
|
|
* supports runtime PM, it should call pm_runtime_put_noidle(),
|
|
* or any other runtime PM helper function decrementing the usage
|
|
* count, in its probe routine and pm_runtime_get_noresume() in
|
|
* its remove routine.
|
|
*/
|
|
pm_runtime_get_sync(dev);
|
|
pci_dev->driver = pci_drv;
|
|
rc = pci_drv->probe(pci_dev, ddi->id);
|
|
if (!rc)
|
|
return rc;
|
|
if (rc < 0) {
|
|
pci_dev->driver = NULL;
|
|
pm_runtime_put_sync(dev);
|
|
return rc;
|
|
}
|
|
/*
|
|
* Probe function should return < 0 for failure, 0 for success
|
|
* Treat values > 0 as success, but warn.
|
|
*/
|
|
dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc);
|
|
return 0;
|
|
}
|
|
|
|
static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
|
|
const struct pci_device_id *id)
|
|
{
|
|
int error, node;
|
|
struct drv_dev_and_id ddi = { drv, dev, id };
|
|
|
|
/*
|
|
* Execute driver initialization on node where the device is
|
|
* attached. This way the driver likely allocates its local memory
|
|
* on the right node.
|
|
*/
|
|
node = dev_to_node(&dev->dev);
|
|
|
|
/*
|
|
* On NUMA systems, we are likely to call a PF probe function using
|
|
* work_on_cpu(). If that probe calls pci_enable_sriov() (which
|
|
* adds the VF devices via pci_bus_add_device()), we may re-enter
|
|
* this function to call the VF probe function. Calling
|
|
* work_on_cpu() again will cause a lockdep warning. Since VFs are
|
|
* always on the same node as the PF, we can work around this by
|
|
* avoiding work_on_cpu() when we're already on the correct node.
|
|
*
|
|
* Preemption is enabled, so it's theoretically unsafe to use
|
|
* numa_node_id(), but even if we run the probe function on the
|
|
* wrong node, it should be functionally correct.
|
|
*/
|
|
if (node >= 0 && node != numa_node_id()) {
|
|
int cpu;
|
|
|
|
get_online_cpus();
|
|
cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
|
|
if (cpu < nr_cpu_ids)
|
|
error = work_on_cpu(cpu, local_pci_probe, &ddi);
|
|
else
|
|
error = local_pci_probe(&ddi);
|
|
put_online_cpus();
|
|
} else
|
|
error = local_pci_probe(&ddi);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* __pci_device_probe - check if a driver wants to claim a specific PCI device
|
|
* @drv: driver to call to check if it wants the PCI device
|
|
* @pci_dev: PCI device being probed
|
|
*
|
|
* returns 0 on success, else error.
|
|
* side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
|
|
*/
|
|
static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
|
|
{
|
|
const struct pci_device_id *id;
|
|
int error = 0;
|
|
|
|
if (!pci_dev->driver && drv->probe) {
|
|
error = -ENODEV;
|
|
|
|
id = pci_match_device(drv, pci_dev);
|
|
if (id)
|
|
error = pci_call_probe(drv, pci_dev, id);
|
|
if (error >= 0)
|
|
error = 0;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
int __weak pcibios_alloc_irq(struct pci_dev *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
void __weak pcibios_free_irq(struct pci_dev *dev)
|
|
{
|
|
}
|
|
|
|
static int pci_device_probe(struct device *dev)
|
|
{
|
|
int error;
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
struct pci_driver *drv = to_pci_driver(dev->driver);
|
|
|
|
error = pcibios_alloc_irq(pci_dev);
|
|
if (error < 0)
|
|
return error;
|
|
|
|
pci_dev_get(pci_dev);
|
|
error = __pci_device_probe(drv, pci_dev);
|
|
if (error) {
|
|
pcibios_free_irq(pci_dev);
|
|
pci_dev_put(pci_dev);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
static int pci_device_remove(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
struct pci_driver *drv = pci_dev->driver;
|
|
|
|
if (drv) {
|
|
if (drv->remove) {
|
|
pm_runtime_get_sync(dev);
|
|
drv->remove(pci_dev);
|
|
pm_runtime_put_noidle(dev);
|
|
}
|
|
pcibios_free_irq(pci_dev);
|
|
pci_dev->driver = NULL;
|
|
}
|
|
|
|
/* Undo the runtime PM settings in local_pci_probe() */
|
|
pm_runtime_put_sync(dev);
|
|
|
|
/*
|
|
* If the device is still on, set the power state as "unknown",
|
|
* since it might change by the next time we load the driver.
|
|
*/
|
|
if (pci_dev->current_state == PCI_D0)
|
|
pci_dev->current_state = PCI_UNKNOWN;
|
|
|
|
/*
|
|
* We would love to complain here if pci_dev->is_enabled is set, that
|
|
* the driver should have called pci_disable_device(), but the
|
|
* unfortunate fact is there are too many odd BIOS and bridge setups
|
|
* that don't like drivers doing that all of the time.
|
|
* Oh well, we can dream of sane hardware when we sleep, no matter how
|
|
* horrible the crap we have to deal with is when we are awake...
|
|
*/
|
|
|
|
pci_dev_put(pci_dev);
|
|
return 0;
|
|
}
|
|
|
|
static void pci_device_shutdown(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
struct pci_driver *drv = pci_dev->driver;
|
|
|
|
pm_runtime_resume(dev);
|
|
|
|
if (drv && drv->shutdown)
|
|
drv->shutdown(pci_dev);
|
|
pci_msi_shutdown(pci_dev);
|
|
pci_msix_shutdown(pci_dev);
|
|
|
|
/*
|
|
* If this is a kexec reboot, turn off Bus Master bit on the
|
|
* device to tell it to not continue to do DMA. Don't touch
|
|
* devices in D3cold or unknown states.
|
|
* If it is not a kexec reboot, firmware will hit the PCI
|
|
* devices with big hammer and stop their DMA any way.
|
|
*/
|
|
if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
|
|
pci_clear_master(pci_dev);
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
/* Auxiliary functions used for system resume and run-time resume. */
|
|
|
|
/**
|
|
* pci_restore_standard_config - restore standard config registers of PCI device
|
|
* @pci_dev: PCI device to handle
|
|
*/
|
|
static int pci_restore_standard_config(struct pci_dev *pci_dev)
|
|
{
|
|
pci_update_current_state(pci_dev, PCI_UNKNOWN);
|
|
|
|
if (pci_dev->current_state != PCI_D0) {
|
|
int error = pci_set_power_state(pci_dev, PCI_D0);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
pci_restore_state(pci_dev);
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
|
|
static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
|
|
{
|
|
pci_power_up(pci_dev);
|
|
pci_restore_state(pci_dev);
|
|
pci_fixup_device(pci_fixup_resume_early, pci_dev);
|
|
}
|
|
|
|
/*
|
|
* Default "suspend" method for devices that have no driver provided suspend,
|
|
* or not even a driver at all (second part).
|
|
*/
|
|
static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
|
|
{
|
|
/*
|
|
* mark its power state as "unknown", since we don't know if
|
|
* e.g. the BIOS will change its device state when we suspend.
|
|
*/
|
|
if (pci_dev->current_state == PCI_D0)
|
|
pci_dev->current_state = PCI_UNKNOWN;
|
|
}
|
|
|
|
/*
|
|
* Default "resume" method for devices that have no driver provided resume,
|
|
* or not even a driver at all (second part).
|
|
*/
|
|
static int pci_pm_reenable_device(struct pci_dev *pci_dev)
|
|
{
|
|
int retval;
|
|
|
|
/* if the device was enabled before suspend, reenable */
|
|
retval = pci_reenable_device(pci_dev);
|
|
/*
|
|
* if the device was busmaster before the suspend, make it busmaster
|
|
* again
|
|
*/
|
|
if (pci_dev->is_busmaster)
|
|
pci_set_master(pci_dev);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static int pci_legacy_suspend(struct device *dev, pm_message_t state)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
struct pci_driver *drv = pci_dev->driver;
|
|
|
|
if (drv && drv->suspend) {
|
|
pci_power_t prev = pci_dev->current_state;
|
|
int error;
|
|
|
|
error = drv->suspend(pci_dev, state);
|
|
suspend_report_result(drv->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: Device state not saved by %pF\n",
|
|
drv->suspend);
|
|
}
|
|
}
|
|
|
|
pci_fixup_device(pci_fixup_suspend, pci_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
struct pci_driver *drv = pci_dev->driver;
|
|
|
|
if (drv && drv->suspend_late) {
|
|
pci_power_t prev = pci_dev->current_state;
|
|
int error;
|
|
|
|
error = drv->suspend_late(pci_dev, state);
|
|
suspend_report_result(drv->suspend_late, 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: Device state not saved by %pF\n",
|
|
drv->suspend_late);
|
|
goto Fixup;
|
|
}
|
|
}
|
|
|
|
if (!pci_dev->state_saved)
|
|
pci_save_state(pci_dev);
|
|
|
|
pci_pm_set_unknown_state(pci_dev);
|
|
|
|
Fixup:
|
|
pci_fixup_device(pci_fixup_suspend_late, 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_has_subordinate(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_has_subordinate(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;
|
|
|
|
/*
|
|
* Devices having power.ignore_children set may still be necessary for
|
|
* suspending their children in the next phase of device suspend.
|
|
*/
|
|
if (dev->power.ignore_children)
|
|
pm_runtime_resume(dev);
|
|
|
|
if (drv && drv->pm && drv->pm->prepare) {
|
|
int error = drv->pm->prepare(dev);
|
|
if (error)
|
|
return error;
|
|
}
|
|
return pci_dev_keep_suspended(to_pci_dev(dev));
|
|
}
|
|
|
|
static void pci_pm_complete(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
|
|
pci_dev_complete_resume(pci_dev);
|
|
pm_generic_complete(dev);
|
|
|
|
/* Resume device if platform firmware has put it in reset-power-on */
|
|
if (dev->power.direct_complete && pm_resume_via_firmware()) {
|
|
pci_power_t pre_sleep_state = pci_dev->current_state;
|
|
|
|
pci_update_current_state(pci_dev, pci_dev->current_state);
|
|
if (pci_dev->current_state < pre_sleep_state)
|
|
pm_request_resume(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 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);
|
|
|
|
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);
|
|
goto Fixup;
|
|
}
|
|
|
|
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);
|
|
goto Fixup;
|
|
}
|
|
}
|
|
|
|
if (!pci_dev->state_saved) {
|
|
pci_save_state(pci_dev);
|
|
if (pci_power_manageable(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);
|
|
|
|
Fixup:
|
|
pci_fixup_device(pci_fixup_suspend_late, pci_dev);
|
|
|
|
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
|
|
|
|
|
|
/*
|
|
* pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing
|
|
* a hibernate transition
|
|
*/
|
|
struct dev_pm_ops __weak pcibios_pm_ops;
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* This used to be done in pci_pm_prepare() for all devices and some
|
|
* drivers may depend on it, so do it here. Ideally, runtime-suspended
|
|
* devices should not be touched during freeze/thaw transitions,
|
|
* however.
|
|
*/
|
|
pm_runtime_resume(dev);
|
|
|
|
pci_dev->state_saved = false;
|
|
if (pm->freeze) {
|
|
int error;
|
|
|
|
error = pm->freeze(dev);
|
|
suspend_report_result(pm->freeze, error);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
if (pcibios_pm_ops.freeze)
|
|
return pcibios_pm_ops.freeze(dev);
|
|
|
|
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);
|
|
|
|
if (pcibios_pm_ops.freeze_noirq)
|
|
return pcibios_pm_ops.freeze_noirq(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 (pcibios_pm_ops.thaw_noirq) {
|
|
error = pcibios_pm_ops.thaw_noirq(dev);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
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 (pcibios_pm_ops.thaw) {
|
|
error = pcibios_pm_ops.thaw(dev);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/* The reason to do that is the same as in pci_pm_suspend(). */
|
|
pm_runtime_resume(dev);
|
|
|
|
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);
|
|
|
|
if (pcibios_pm_ops.poweroff)
|
|
return pcibios_pm_ops.poweroff(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) {
|
|
pci_fixup_device(pci_fixup_suspend_late, pci_dev);
|
|
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_has_subordinate(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);
|
|
|
|
pci_fixup_device(pci_fixup_suspend_late, pci_dev);
|
|
|
|
if (pcibios_pm_ops.poweroff_noirq)
|
|
return pcibios_pm_ops.poweroff_noirq(dev);
|
|
|
|
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;
|
|
|
|
if (pcibios_pm_ops.restore_noirq) {
|
|
error = pcibios_pm_ops.restore_noirq(dev);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
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;
|
|
|
|
if (pcibios_pm_ops.restore) {
|
|
error = pcibios_pm_ops.restore(dev);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
|
|
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;
|
|
error = pm->runtime_suspend(dev);
|
|
if (error) {
|
|
/*
|
|
* -EBUSY and -EAGAIN is used to request the runtime PM core
|
|
* to schedule a new suspend, so log the event only with debug
|
|
* log level.
|
|
*/
|
|
if (error == -EBUSY || error == -EAGAIN)
|
|
dev_dbg(dev, "can't suspend now (%pf returned %d)\n",
|
|
pm->runtime_suspend, error);
|
|
else
|
|
dev_err(dev, "can't suspend (%pf returned %d)\n",
|
|
pm->runtime_suspend, error);
|
|
|
|
return error;
|
|
}
|
|
|
|
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;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* 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)
|
|
return -ENOSYS;
|
|
|
|
if (pm->runtime_idle)
|
|
ret = pm->runtime_idle(dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static 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 /* !CONFIG_PM */
|
|
|
|
#define pci_pm_runtime_suspend NULL
|
|
#define pci_pm_runtime_resume NULL
|
|
#define pci_pm_runtime_idle NULL
|
|
|
|
#define PCI_PM_OPS_PTR NULL
|
|
|
|
#endif /* !CONFIG_PM */
|
|
|
|
/**
|
|
* __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);
|
|
}
|
|
EXPORT_SYMBOL(__pci_register_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);
|
|
}
|
|
EXPORT_SYMBOL(pci_unregister_driver);
|
|
|
|
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;
|
|
}
|
|
EXPORT_SYMBOL(pci_dev_driver);
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
EXPORT_SYMBOL(pci_dev_get);
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
EXPORT_SYMBOL(pci_dev_put);
|
|
|
|
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 (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_groups = pci_dev_groups,
|
|
.bus_groups = pci_bus_groups,
|
|
.drv_groups = pci_drv_groups,
|
|
.pm = PCI_PM_OPS_PTR,
|
|
};
|
|
EXPORT_SYMBOL(pci_bus_type);
|
|
|
|
static int __init pci_driver_init(void)
|
|
{
|
|
return bus_register(&pci_bus_type);
|
|
}
|
|
postcore_initcall(pci_driver_init);
|