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PCI: Add slot reset option to pci_dev_reset()

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If the hotplug controller provides a way to reset a slot, use that
before a direct parent bus reset.  Like the bus reset option, this is
only available when a single pci_dev occupies the slot.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Alex Williamson 2013-08-08 14:09:43 -06:00 committed by Bjorn Helgaas
parent 2e35afaefe
commit 608c388122
1 changed files with 34 additions and 0 deletions
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34
drivers/pci/pci.c
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@ -22,6 +22,7 @@
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/pm_runtime.h>
#include <linux/pci_hotplug.h>
#include <asm-generic/pci-bridge.h>
#include <asm/setup.h>
#include "pci.h"
@ -3256,6 +3257,35 @@ static int pci_parent_bus_reset(struct pci_dev *dev, int probe)
return 0;
}
static int pci_reset_hotplug_slot(struct hotplug_slot *hotplug, int probe)
{
int rc = -ENOTTY;
if (!hotplug || !try_module_get(hotplug->ops->owner))
return rc;
if (hotplug->ops->reset_slot)
rc = hotplug->ops->reset_slot(hotplug, probe);
module_put(hotplug->ops->owner);
return rc;
}
static int pci_dev_reset_slot_function(struct pci_dev *dev, int probe)
{
struct pci_dev *pdev;
if (dev->subordinate || !dev->slot)
return -ENOTTY;
list_for_each_entry(pdev, &dev->bus->devices, bus_list)
if (pdev != dev && pdev->slot == dev->slot)
return -ENOTTY;
return pci_reset_hotplug_slot(dev->slot->hotplug, probe);
}
static int __pci_dev_reset(struct pci_dev *dev, int probe)
{
int rc;
@ -3278,6 +3308,10 @@ static int __pci_dev_reset(struct pci_dev *dev, int probe)
if (rc != -ENOTTY)
goto done;
rc = pci_dev_reset_slot_function(dev, probe);
if (rc != -ENOTTY)
goto done;
rc = pci_parent_bus_reset(dev, probe);
done:
return rc;