Commit 954bd994 authored by Oliver O'Halloran's avatar Oliver O'Halloran Committed by Michael Ellerman

powerpc/eeh: Add eeh_force_recover to debugfs

This patch adds a debugfs interface to force scheduling a recovery event.
This can be used to recover a specific PE or schedule a "special" recovery
even that checks for errors at the PHB level.
To force a recovery of a normal PE, use:

 echo '<#pe>:<#phb>' > /sys/kernel/debug/powerpc/eeh_force_recover

To force a scan for broken PHBs:

 echo 'hwcheck' > /sys/kernel/debug/powerpc/eeh_force_recover
Signed-off-by: default avatarOliver O'Halloran <oohall@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 6b493f60
......@@ -33,6 +33,7 @@ struct eeh_event {
int eeh_event_init(void);
int eeh_send_failure_event(struct eeh_pe *pe);
int __eeh_send_failure_event(struct eeh_pe *pe);
void eeh_remove_event(struct eeh_pe *pe, bool force);
void eeh_handle_normal_event(struct eeh_pe *pe);
void eeh_handle_special_event(void);
......
......@@ -1838,6 +1838,62 @@ static int eeh_enable_dbgfs_get(void *data, u64 *val)
DEFINE_DEBUGFS_ATTRIBUTE(eeh_enable_dbgfs_ops, eeh_enable_dbgfs_get,
eeh_enable_dbgfs_set, "0x%llx\n");
static ssize_t eeh_force_recover_write(struct file *filp,
const char __user *user_buf,
size_t count, loff_t *ppos)
{
struct pci_controller *hose;
uint32_t phbid, pe_no;
struct eeh_pe *pe;
char buf[20];
int ret;
ret = simple_write_to_buffer(buf, sizeof(buf), ppos, user_buf, count);
if (!ret)
return -EFAULT;
/*
* When PE is NULL the event is a "special" event. Rather than
* recovering a specific PE it forces the EEH core to scan for failed
* PHBs and recovers each. This needs to be done before any device
* recoveries can occur.
*/
if (!strncmp(buf, "hwcheck", 7)) {
__eeh_send_failure_event(NULL);
return count;
}
ret = sscanf(buf, "%x:%x", &phbid, &pe_no);
if (ret != 2)
return -EINVAL;
hose = pci_find_controller_for_domain(phbid);
if (!hose)
return -ENODEV;
/* Retrieve PE */
pe = eeh_pe_get(hose, pe_no, 0);
if (!pe)
return -ENODEV;
/*
* We don't do any state checking here since the detection
* process is async to the recovery process. The recovery
* thread *should* not break even if we schedule a recovery
* from an odd state (e.g. PE removed, or recovery of a
* non-isolated PE)
*/
__eeh_send_failure_event(pe);
return ret < 0 ? ret : count;
}
static const struct file_operations eeh_force_recover_fops = {
.open = simple_open,
.llseek = no_llseek,
.write = eeh_force_recover_write,
};
#endif
static int __init eeh_init_proc(void)
......@@ -1853,6 +1909,9 @@ static int __init eeh_init_proc(void)
debugfs_create_bool("eeh_disable_recovery", 0600,
powerpc_debugfs_root,
&eeh_debugfs_no_recover);
debugfs_create_file_unsafe("eeh_force_recover", 0600,
powerpc_debugfs_root, NULL,
&eeh_force_recover_fops);
eeh_cache_debugfs_init();
#endif
}
......
......@@ -121,20 +121,11 @@ int eeh_event_init(void)
* the actual event will be delivered in a normal context
* (from a workqueue).
*/
int eeh_send_failure_event(struct eeh_pe *pe)
int __eeh_send_failure_event(struct eeh_pe *pe)
{
unsigned long flags;
struct eeh_event *event;
/*
* If we've manually supressed recovery events via debugfs
* then just drop it on the floor.
*/
if (eeh_debugfs_no_recover) {
pr_err("EEH: Event dropped due to no_recover setting\n");
return 0;
}
event = kzalloc(sizeof(*event), GFP_ATOMIC);
if (!event) {
pr_err("EEH: out of memory, event not handled\n");
......@@ -153,6 +144,20 @@ int eeh_send_failure_event(struct eeh_pe *pe)
return 0;
}
int eeh_send_failure_event(struct eeh_pe *pe)
{
/*
* If we've manually supressed recovery events via debugfs
* then just drop it on the floor.
*/
if (eeh_debugfs_no_recover) {
pr_err("EEH: Event dropped due to no_recover setting\n");
return 0;
}
return __eeh_send_failure_event(pe);
}
/**
* eeh_remove_event - Remove EEH event from the queue
* @pe: Event binding to the PE
......
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