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powerpc/eeh: Clean up and document event handling functions 

Remove unnecessary tags in eeh_handle_normal_event(), and add function
comments for eeh_handle_normal_event() and eeh_handle_special_event().

The only functional difference is that in the case of a PE reaching the
maximum number of failures, rather than one message telling you of this
and suggesting you reseat the device, there are two separate messages.

Suggested-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Russell Currey <ruscur@russell.cc>
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Russell Currey 2017-04-19 17:39:27 +10:00 committed by Michael Ellerman
parent daeba2956f
commit c0b64978f0
1 changed files with 24 additions and 12 deletions
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36
arch/powerpc/kernel/eeh_driver.c
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@ -724,6 +724,15 @@ static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus,
*/
#define MAX_WAIT_FOR_RECOVERY 300
/**
* eeh_handle_normal_event - Handle EEH events on a specific PE
* @pe: EEH PE
*
* Attempts to recover the given PE. If recovery fails or the PE has failed
* too many times, remove the PE.
*
* Returns true if @pe should no longer be used, else false.
*/
static bool eeh_handle_normal_event(struct eeh_pe *pe)
{
struct pci_bus *frozen_bus;
@ -741,8 +750,13 @@ static bool eeh_handle_normal_event(struct eeh_pe *pe)
eeh_pe_update_time_stamp(pe);
pe->freeze_count++;
if (pe->freeze_count > eeh_max_freezes)
goto excess_failures;
if (pe->freeze_count > eeh_max_freezes) {
pr_err("EEH: PHB#%x-PE#%x has failed %d times in the\n"
"last hour and has been permanently disabled.\n",
pe->phb->global_number, pe->addr,
pe->freeze_count);
goto hard_fail;
}
pr_warn("EEH: This PCI device has failed %d times in the last hour\n",
pe->freeze_count);
@ -872,25 +886,16 @@ static bool eeh_handle_normal_event(struct eeh_pe *pe)
return false;
excess_failures:
hard_fail:
/*
* About 90% of all real-life EEH failures in the field
* are due to poorly seated PCI cards. Only 10% or so are
* due to actual, failed cards.
*/
pr_err("EEH: PHB#%x-PE#%x has failed %d times in the\n"
"last hour and has been permanently disabled.\n"
"Please try reseating or replacing it.\n",
pe->phb->global_number, pe->addr,
pe->freeze_count);
goto perm_error;
hard_fail:
pr_err("EEH: Unable to recover from failure from PHB#%x-PE#%x.\n"
"Please try reseating or replacing it\n",
pe->phb->global_number, pe->addr);
perm_error:
eeh_slot_error_detail(pe, EEH_LOG_PERM);
/* Notify all devices that they're about to go down. */
@ -923,6 +928,13 @@ perm_error:
return false;
}
/**
* eeh_handle_special_event - Handle EEH events without a specific failing PE
*
* Called when an EEH event is detected but can't be narrowed down to a
* specific PE. Iterates through possible failures and handles them as
* necessary.
*/
static void eeh_handle_special_event(void)
{
struct eeh_pe *pe, *phb_pe;