void eeh_sysfs_add_device(struct pci_dev *pdev)
{
struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
int rc=0;
if (!eeh_enabled())
return;
if (edev && (edev->mode & EEH_DEV_SYSFS))
return;
rc += device_create_file(&pdev->dev, &dev_attr_eeh_mode);
rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_state);
if (rc)
pr_warn("EEH: Unable to create sysfs entries\n");
else if (edev)
edev->mode |= EEH_DEV_SYSFS;
}
long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
unsigned int cmd, unsigned long arg)
{
struct eeh_pe *pe;
struct vfio_eeh_pe_op op;
unsigned long minsz;
long ret = -EINVAL;
switch (cmd) {
case VFIO_CHECK_EXTENSION:
if (arg == VFIO_EEH)
ret = eeh_enabled() ? 1 : 0;
else
ret = 0;
break;
case VFIO_EEH_PE_OP:
pe = eeh_iommu_group_to_pe(group);
if (!pe)
return -ENODEV;
minsz = offsetofend(struct vfio_eeh_pe_op, op);
if (copy_from_user(&op, (void __user *)arg, minsz))
return -EFAULT;
if (op.argsz < minsz || op.flags)
return -EINVAL;
switch (op.op) {
case VFIO_EEH_PE_DISABLE:
ret = eeh_pe_set_option(pe, EEH_OPT_DISABLE);
break;
case VFIO_EEH_PE_ENABLE:
ret = eeh_pe_set_option(pe, EEH_OPT_ENABLE);
break;
case VFIO_EEH_PE_UNFREEZE_IO:
ret = eeh_pe_set_option(pe, EEH_OPT_THAW_MMIO);
break;
case VFIO_EEH_PE_UNFREEZE_DMA:
ret = eeh_pe_set_option(pe, EEH_OPT_THAW_DMA);
break;
case VFIO_EEH_PE_GET_STATE:
ret = eeh_pe_get_state(pe);
break;
case VFIO_EEH_PE_RESET_DEACTIVATE:
ret = eeh_pe_reset(pe, EEH_RESET_DEACTIVATE, true);
break;
case VFIO_EEH_PE_RESET_HOT:
ret = eeh_pe_reset(pe, EEH_RESET_HOT, true);
break;
case VFIO_EEH_PE_RESET_FUNDAMENTAL:
ret = eeh_pe_reset(pe, EEH_RESET_FUNDAMENTAL, true);
break;
case VFIO_EEH_PE_CONFIGURE:
ret = eeh_pe_configure(pe);
break;
case VFIO_EEH_PE_INJECT_ERR:
minsz = offsetofend(struct vfio_eeh_pe_op, err.mask);
if (op.argsz < minsz)
return -EINVAL;
if (copy_from_user(&op, (void __user *)arg, minsz))
return -EFAULT;
ret = eeh_pe_inject_err(pe, op.err.type, op.err.func,
op.err.addr, op.err.mask);
break;
default:
ret = -EINVAL;
}
}
return ret;
}
/**
* eeh_dev_check_failure - Check if all 1's data is due to EEH slot freeze
* @edev: eeh device
*
* Check for an EEH failure for the given device node. Call this
* routine if the result of a read was all 0xff's and you want to
* find out if this is due to an EEH slot freeze. This routine
* will query firmware for the EEH status.
*
* Returns 0 if there has not been an EEH error; otherwise returns
* a non-zero value and queues up a slot isolation event notification.
*
* It is safe to call this routine in an interrupt context.
*/
int eeh_dev_check_failure(struct eeh_dev *edev)
{
int ret;
int active_flags = (EEH_STATE_MMIO_ACTIVE | EEH_STATE_DMA_ACTIVE);
unsigned long flags;
struct pci_dn *pdn;
struct pci_dev *dev;
struct eeh_pe *pe, *parent_pe, *phb_pe;
int rc = 0;
const char *location = NULL;
eeh_stats.total_mmio_ffs++;
if (!eeh_enabled())
return 0;
if (!edev) {
eeh_stats.no_dn++;
return 0;
}
dev = eeh_dev_to_pci_dev(edev);
pe = eeh_dev_to_pe(edev);
/* Access to IO BARs might get this far and still not want checking. */
if (!pe) {
eeh_stats.ignored_check++;
pr_debug("EEH: Ignored check for %s\n",
eeh_pci_name(dev));
return 0;
}
if (!pe->addr && !pe->config_addr) {
eeh_stats.no_cfg_addr++;
return 0;
}
/*
* On PowerNV platform, we might already have fenced PHB
* there and we need take care of that firstly.
*/
ret = eeh_phb_check_failure(pe);
if (ret > 0)
return ret;
/*
* If the PE isn't owned by us, we shouldn't check the
* state. Instead, let the owner handle it if the PE has
* been frozen.
*/
if (eeh_pe_passed(pe))
return 0;
/* If we already have a pending isolation event for this
* slot, we know it's bad already, we don't need to check.
* Do this checking under a lock; as multiple PCI devices
* in one slot might report errors simultaneously, and we
* only want one error recovery routine running.
*/
eeh_serialize_lock(&flags);
rc = 1;
if (pe->state & EEH_PE_ISOLATED) {
pe->check_count++;
if (pe->check_count % EEH_MAX_FAILS == 0) {
pdn = eeh_dev_to_pdn(edev);
if (pdn->node)
location = of_get_property(pdn->node, "ibm,loc-code", NULL);
printk(KERN_ERR "EEH: %d reads ignored for recovering device at "
"location=%s driver=%s pci addr=%s\n",
pe->check_count,
location ? location : "unknown",
eeh_driver_name(dev), eeh_pci_name(dev));
printk(KERN_ERR "EEH: Might be infinite loop in %s driver\n",
eeh_driver_name(dev));
dump_stack();
}
goto dn_unlock;
}
/*
* Now test for an EEH failure. This is VERY expensive.
* Note that the eeh_config_addr may be a parent device
* in the case of a device behind a bridge, or it may be
* function zero of a multi-function device.
* In any case they must share a common PHB.
*/
ret = eeh_ops->get_state(pe, NULL);
/* Note that config-io to empty slots may fail;
* they are empty when they don't have children.
* We will punt with the following conditions: Failure to get
* PE's state, EEH not support and Permanently unavailable
* state, PE is in good state.
*/
if ((ret < 0) ||
(ret == EEH_STATE_NOT_SUPPORT) ||
((ret & active_flags) == active_flags)) {
eeh_stats.false_positives++;
pe->false_positives++;
rc = 0;
goto dn_unlock;
}
/*
* It should be corner case that the parent PE has been
* put into frozen state as well. We should take care
* that at first.
*/
parent
