powerpc/eeh: Refactor EEH flag accessors

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>

6 files changed, 27 insertions, 38 deletions

diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h
index 6e4789418233..ca8aada95069 100644
--- a/arch/powerpc/include/asm/eeh.h
+++ b/arch/powerpc/include/asm/eeh.h
@@ -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)
+static inline void eeh_add_flag(int flag)
 {
-        if ((eeh_subsystem_flags & EEH_FORCE_DISABLED) ||
-            !(eeh_subsystem_flags & EEH_ENABLED))
-                return false;
-
-        return true;
+        eeh_subsystem_flags |= flag;
 }
 
-static inline void eeh_set_enable(bool mode)
+static inline void eeh_clear_flag(int flag)
 {
-        if (mode)
-                eeh_subsystem_flags |= EEH_ENABLED;
-        else
-                eeh_subsystem_flags &= ~EEH_ENABLED;
+        eeh_subsystem_flags &= ~flag;
 }
 
-static inline void eeh_probe_mode_set(int flag)
+static inline bool eeh_has_flag(int flag)
 {
-        eeh_subsystem_flags |= flag;
+        return !!(eeh_subsystem_flags & flag);
 }
 
-static inline int eeh_probe_mode_devtree(void)
+static inline bool eeh_enabled(void)
 {
-        return (eeh_subsystem_flags & EEH_PROBE_MODE_DEVTREE);
-}
+        if (eeh_has_flag(EEH_FORCE_DISABLED) ||
+            !eeh_has_flag(EEH_ENABLED))
+                return false;
 
-static inline int eeh_probe_mode_dev(void)
-{
-        return (eeh_subsystem_flags & EEH_PROBE_MODE_DEV);
+        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;
diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c
index 4de2103a30c7..65a163fb7b6c 100644
--- a/arch/powerpc/kernel/eeh.c
+++ b/arch/powerpc/kernel/eeh.c
@@ -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)
diff --git a/arch/powerpc/kernel/eeh_cache.c b/arch/powerpc/kernel/eeh_cache.c
index e8c9fd546a5c..3639bee5d9ce 100644
--- a/arch/powerpc/kernel/eeh_cache.c
+++ b/arch/powerpc/kernel/eeh_cache.c
@@ -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);
diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c b/arch/powerpc/platforms/powernv/eeh-powernv.c
index c3a5c2f63c3d..996d8844cbdf 100644
--- a/arch/powerpc/platforms/powernv/eeh-powernv.c
+++ b/arch/powerpc/platforms/powernv/eeh-powernv.c
@@ -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);
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 035db476be0e..0701f90ac625 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -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
diff --git a/arch/powerpc/platforms/pseries/eeh_pseries.c b/arch/powerpc/platforms/pseries/eeh_pseries.c
index 476a5d8b0b36..ba94b5b8d58c 100644
--- a/arch/powerpc/platforms/pseries/eeh_pseries.c
+++ b/arch/powerpc/platforms/pseries/eeh_pseries.c
@@ -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",