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powerpc/eeh: Refactor EEH flag accessors

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There are multiple global EEH flags. Almost each flag has its own
accessor, which doesn't make sense. The patch refactors EEH flag
accessors so that they look unified:

  eeh_add_flag():   Add EEH flag
  eeh_clear_flag(): Clear EEH flag
  eeh_has_flag():   Check if one specific flag has been set
  eeh_enabled():    Check if EEH functionality has been enabled

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Gavin Shan 2014-07-17 14:41:38 +10:00 committed by Benjamin Herrenschmidt
parent a3032ca9f8
commit 05b1721d9f
6 changed files with 30 additions and 41 deletions
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38
arch/powerpc/include/asm/eeh.h
View File

@ -206,36 +206,28 @@ extern int eeh_subsystem_flags;
extern struct eeh_ops *eeh_ops;
extern raw_spinlock_t confirm_error_lock;
static inline bool eeh_enabled(void)
{
if ((eeh_subsystem_flags & EEH_FORCE_DISABLED) ||
!(eeh_subsystem_flags & EEH_ENABLED))
return false;
return true;
}
static inline void eeh_set_enable(bool mode)
{
if (mode)
eeh_subsystem_flags |= EEH_ENABLED;
else
eeh_subsystem_flags &= ~EEH_ENABLED;
}
static inline void eeh_probe_mode_set(int flag)
static inline void eeh_add_flag(int flag)
{
eeh_subsystem_flags |= flag;
}
static inline int eeh_probe_mode_devtree(void)
static inline void eeh_clear_flag(int flag)
{
return (eeh_subsystem_flags & EEH_PROBE_MODE_DEVTREE);
eeh_subsystem_flags &= ~flag;
}
static inline int eeh_probe_mode_dev(void)
static inline bool eeh_has_flag(int flag)
{
return (eeh_subsystem_flags & EEH_PROBE_MODE_DEV);
return !!(eeh_subsystem_flags & flag);
}
static inline bool eeh_enabled(void)
{
if (eeh_has_flag(EEH_FORCE_DISABLED) ||
!eeh_has_flag(EEH_ENABLED))
return false;
return true;
}
static inline void eeh_serialize_lock(unsigned long *flags)
@ -314,8 +306,6 @@ static inline bool eeh_enabled(void)
return false;
}
static inline void eeh_set_enable(bool mode) { }
static inline int eeh_init(void)
{
return 0;

20
arch/powerpc/kernel/eeh.c
View File

@ -142,7 +142,7 @@ static struct eeh_stats eeh_stats;
static int __init eeh_setup(char *str)
{
if (!strcmp(str, "off"))
eeh_subsystem_flags |= EEH_FORCE_DISABLED;
eeh_add_flag(EEH_FORCE_DISABLED);
return 1;
}
@ -252,7 +252,7 @@ void eeh_slot_error_detail(struct eeh_pe *pe, int severity)
* 0xFF's is always returned from PCI config space.
*/
if (!(pe->type & EEH_PE_PHB)) {
if (eeh_probe_mode_devtree())
if (eeh_has_flag(EEH_PROBE_MODE_DEVTREE))
eeh_pci_enable(pe, EEH_OPT_THAW_MMIO);
eeh_ops->configure_bridge(pe);
eeh_pe_restore_bars(pe);
@ -303,7 +303,7 @@ static int eeh_phb_check_failure(struct eeh_pe *pe)
unsigned long flags;
int ret;
if (!eeh_probe_mode_dev())
if (!eeh_has_flag(EEH_PROBE_MODE_DEV))
return -EPERM;
/* Find the PHB PE */
@ -801,7 +801,7 @@ int __exit eeh_ops_unregister(const char *name)
static int eeh_reboot_notifier(struct notifier_block *nb,
unsigned long action, void *unused)
{
eeh_set_enable(false);
eeh_clear_flag(EEH_ENABLED);
return NOTIFY_DONE;
}
@ -865,13 +865,13 @@ int eeh_init(void)
return ret;
/* Enable EEH for all adapters */
if (eeh_probe_mode_devtree()) {
if (eeh_has_flag(EEH_PROBE_MODE_DEVTREE)) {
list_for_each_entry_safe(hose, tmp,
&hose_list, list_node) {
phb = hose->dn;
traverse_pci_devices(phb, eeh_ops->of_probe, NULL);
}
} else if (eeh_probe_mode_dev()) {
} else if (eeh_has_flag(EEH_PROBE_MODE_DEV)) {
list_for_each_entry_safe(hose, tmp,
&hose_list, list_node)
pci_walk_bus(hose->bus, eeh_ops->dev_probe, NULL);
@ -923,7 +923,7 @@ void eeh_add_device_early(struct device_node *dn)
* would delay the probe until late stage because
* the PCI device isn't available this moment.
*/
if (!eeh_probe_mode_devtree())
if (!eeh_has_flag(EEH_PROBE_MODE_DEVTREE))
return;
if (!of_node_to_eeh_dev(dn))
@ -1009,7 +1009,7 @@ void eeh_add_device_late(struct pci_dev *dev)
* We have to do the EEH probe here because the PCI device
* hasn't been created yet in the early stage.
*/
if (eeh_probe_mode_dev())
if (eeh_has_flag(EEH_PROBE_MODE_DEV))
eeh_ops->dev_probe(dev, NULL);
eeh_addr_cache_insert_dev(dev);
@ -1430,9 +1430,9 @@ static const struct file_operations proc_eeh_operations = {
static int eeh_enable_dbgfs_set(void *data, u64 val)
{
if (val)
eeh_subsystem_flags &= ~EEH_FORCE_DISABLED;
eeh_clear_flag(EEH_FORCE_DISABLED);
else
eeh_subsystem_flags |= EEH_FORCE_DISABLED;
eeh_add_flag(EEH_FORCE_DISABLED);
/* Notify the backend */
if (eeh_ops->post_init)

2
arch/powerpc/kernel/eeh_cache.c
View File

@ -189,7 +189,7 @@ static void __eeh_addr_cache_insert_dev(struct pci_dev *dev)
}
/* Skip any devices for which EEH is not enabled. */
if (!eeh_probe_mode_dev() && !edev->pe) {
if (!edev->pe) {
#ifdef DEBUG
pr_info("PCI: skip building address cache for=%s - %s\n",
pci_name(dev), dn->full_name);

6
arch/powerpc/platforms/powernv/eeh-powernv.c
View File

@ -51,8 +51,8 @@ static int powernv_eeh_init(void)
return -EINVAL;
}
/* Set EEH probe mode */
eeh_probe_mode_set(EEH_PROBE_MODE_DEV);
/* Set probe mode */
eeh_add_flag(EEH_PROBE_MODE_DEV);
return 0;
}
@ -164,7 +164,7 @@ static int powernv_eeh_dev_probe(struct pci_dev *dev, void *flag)
* Enable EEH explicitly so that we will do EEH check
* while accessing I/O stuff
*/
eeh_set_enable(true);
eeh_add_flag(EEH_ENABLED);
/* Save memory bars */
eeh_save_bars(edev);

1
arch/powerpc/platforms/powernv/pci-ioda.c
View File

@ -1157,7 +1157,6 @@ static void pnv_pci_ioda_fixup(void)
pnv_pci_ioda_create_dbgfs();
#ifdef CONFIG_EEH
eeh_probe_mode_set(EEH_PROBE_MODE_DEV);
eeh_init();
eeh_addr_cache_build();
#endif

4
arch/powerpc/platforms/pseries/eeh_pseries.c
View File

@ -128,7 +128,7 @@ static int pseries_eeh_init(void)
}
/* Set EEH probe mode */
eeh_probe_mode_set(EEH_PROBE_MODE_DEVTREE);
eeh_add_flag(EEH_PROBE_MODE_DEVTREE);
return 0;
}
@ -297,7 +297,7 @@ static void *pseries_eeh_of_probe(struct device_node *dn, void *flag)
enable = 1;
if (enable) {
eeh_set_enable(true);
eeh_add_flag(EEH_ENABLED);
eeh_add_to_parent_pe(edev);
pr_debug("%s: EEH enabled on %s PHB#%d-PE#%x, config addr#%x\n",