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s390/pci: add recover sysfs knob 

Add an arch specific attribute to recover a pci function from an
error state or config space blockage.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2013-08-29 19:35:19 +02:00 committed by Martin Schwidefsky
parent cb80918287
commit 0ff70ec88b
3 changed files with 29 additions and 4 deletions
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4
arch/s390/pci/pci.c
View File

@ -791,6 +791,8 @@ int zpci_enable_device(struct zpci_dev *zdev)
rc = zpci_dma_init_device(zdev);
if (rc)
goto out_dma;
zdev->state = ZPCI_FN_STATE_ONLINE;
return 0;
out_dma:
@ -819,8 +821,6 @@ int zpci_create_device(struct zpci_dev *zdev)
rc = zpci_enable_device(zdev);
if (rc)
goto out_free;
zdev->state = ZPCI_FN_STATE_ONLINE;
}
rc = zpci_scan_bus(zdev);
if (rc)

27
arch/s390/pci/pci_sysfs.c
View File

@ -48,11 +48,38 @@ static ssize_t show_pfgid(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR(pfgid, S_IRUGO, show_pfgid, NULL);
static void recover_callback(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
struct zpci_dev *zdev = get_zdev(pdev);
int ret;
pci_stop_and_remove_bus_device(pdev);
ret = zpci_disable_device(zdev);
if (ret)
return;
ret = zpci_enable_device(zdev);
if (ret)
return;
pci_rescan_bus(zdev->bus);
}
static ssize_t store_recover(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int rc = device_schedule_callback(dev, recover_callback);
return rc ? rc : count;
}
static DEVICE_ATTR(recover, S_IWUSR, NULL, store_recover);
static struct device_attribute *zpci_dev_attrs[] = {
&dev_attr_function_id,
&dev_attr_function_handle,
&dev_attr_pchid,
&dev_attr_pfgid,
&dev_attr_recover,
NULL,
};

2
drivers/pci/hotplug/s390_pci_hpc.c
View File

@ -79,8 +79,6 @@ static int enable_slot(struct hotplug_slot *hotplug_slot)
if (rc)
goto out_deconfigure;
slot->zdev->state = ZPCI_FN_STATE_ONLINE;
pci_scan_slot(slot->zdev->bus, ZPCI_DEVFN);
pci_bus_add_devices(slot->zdev->bus);