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authorMike Qiu <qiudayu@linux.vnet.ibm.com>2014-09-30 12:38:57 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2014-09-30 17:15:10 +1000
commit7a062782295a896f697137aacbe23400fbbafa94 (patch)
tree1b854d6b7720e31dad154a345aab4b19a46bd826 /arch/powerpc/platforms/powernv
parent131c123abec375afc819da89925dbce97590278e (diff)
downloadblackbird-op-linux-7a062782295a896f697137aacbe23400fbbafa94.tar.gz
blackbird-op-linux-7a062782295a896f697137aacbe23400fbbafa94.zip
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: 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>
Diffstat (limited to 'arch/powerpc/platforms/powernv')
-rw-r--r--arch/powerpc/platforms/powernv/eeh-ioda.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/eeh-ioda.c b/arch/powerpc/platforms/powernv/eeh-ioda.c
index 1ac80db1489b..22609f23f455 100644
--- a/arch/powerpc/platforms/powernv/eeh-ioda.c
+++ b/arch/powerpc/platforms/powernv/eeh-ioda.c
@@ -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);
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