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Commit 7a062782 authored by Mike Qiu's avatar Mike Qiu Committed by Michael Ellerman
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powerpc/powernv: Add PCI error injection debugfs entry 



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: default avatarMike Qiu <qiudayu@linux.vnet.ibm.com>
Signed-off-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 131c123a

arch/powerpc/platforms/powernv/eeh-ioda.c

+52 −0
Original line number Diff line number Diff line
@@ -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);