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powerpc/powernv: Add PCI error injection debugfs entry

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The patch adds debugfs file (/sys/kernel/debug/powerpc/PCIxxxx/
err_injct), which accepts following formated string, to support
error injection. It will be used to support userland utility
"errinjct" in future.

  "pe_no:0:function:address:mask" - 32-bits PCI errors
  "pe_no:1:function:address:mask" - 64-bits PCI errors

Signed-off-by: Mike Qiu <qiudayu@linux.vnet.ibm.com>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Mike Qiu 2014-09-30 12:38:57 +10:00 committed by Michael Ellerman
parent 131c123abe
commit 7a06278229
1 changed files with 52 additions and 0 deletions
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52
arch/powerpc/platforms/powernv/eeh-ioda.c
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@ -66,6 +66,54 @@ static struct notifier_block ioda_eeh_nb = {
};
#ifdef CONFIG_DEBUG_FS
static ssize_t ioda_eeh_ei_write(struct file *filp,
const char __user *user_buf,
size_t count, loff_t *ppos)
{
struct pci_controller *hose = filp->private_data;
struct pnv_phb *phb = hose->private_data;
struct eeh_dev *edev;
struct eeh_pe *pe;
int pe_no, type, func;
unsigned long addr, mask;
char buf[50];
int ret;
if (!phb->eeh_ops || !phb->eeh_ops->err_inject)
return -ENXIO;
ret = simple_write_to_buffer(buf, sizeof(buf), ppos, user_buf, count);
if (!ret)
return -EFAULT;
/* Retrieve parameters */
ret = sscanf(buf, "%x:%x:%x:%lx:%lx",
&pe_no, &type, &func, &addr, &mask);
if (ret != 5)
return -EINVAL;
/* Retrieve PE */
edev = kzalloc(sizeof(*edev), GFP_KERNEL);
if (!edev)
return -ENOMEM;
edev->phb = hose;
edev->pe_config_addr = pe_no;
pe = eeh_pe_get(edev);
kfree(edev);
if (!pe)
return -ENODEV;
/* Do error injection */
ret = phb->eeh_ops->err_inject(pe, type, func, addr, mask);
return ret < 0 ? ret : count;
}
static const struct file_operations ioda_eeh_ei_fops = {
.open = simple_open,
.llseek = no_llseek,
.write = ioda_eeh_ei_write,
};
static int ioda_eeh_dbgfs_set(void *data, int offset, u64 val)
{
struct pci_controller *hose = data;
@ -152,6 +200,10 @@ static int ioda_eeh_post_init(struct pci_controller *hose)
if (!phb->has_dbgfs && phb->dbgfs) {
phb->has_dbgfs = 1;
debugfs_create_file("err_injct", 0200,
phb->dbgfs, hose,
&ioda_eeh_ei_fops);
debugfs_create_file("err_injct_outbound", 0600,
phb->dbgfs, hose,
&ioda_eeh_outb_dbgfs_ops);