powerpc/eeh: Cleanup EEH subsystem variables
There're 2 EEH subsystem variables: eeh_subsystem_enabled and
eeh_probe_mode. We needn't maintain 2 variables and we can just
have one variable and introduce different flags. The patch also
introduces additional flag EEH_FORCE_DISABLE, which will be used
to disable EEH subsystem via boot parameter ("eeh=off") in future.
Besides, the patch also introduces flag EEH_ENABLED, which is
changed to disable or enable EEH functionality on the fly through
debugfs entry in future.
With the patch applied, the creteria to check the enabled EEH
functionality is changed to:
!EEH_FORCE_DISABLED && EEH_ENABLED : Enabled
Other cases : Disabled
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h
index f0183e3..f4a9321 100644
--- a/arch/powerpc/include/asm/eeh.h
+++ b/arch/powerpc/include/asm/eeh.h
@@ -32,6 +32,12 @@
#ifdef CONFIG_EEH
+/* EEH subsystem flags */
+#define EEH_ENABLED 0x1 /* EEH enabled */
+#define EEH_FORCE_DISABLED 0x2 /* EEH disabled */
+#define EEH_PROBE_MODE_DEV 0x4 /* From PCI device */
+#define EEH_PROBE_MODE_DEVTREE 0x8 /* From device tree */
+
/*
* The struct is used to trace PE related EEH functionality.
* In theory, there will have one instance of the struct to
@@ -173,37 +179,40 @@
int (*restore_config)(struct device_node *dn);
};
+extern int eeh_subsystem_flags;
extern struct eeh_ops *eeh_ops;
-extern bool eeh_subsystem_enabled;
extern raw_spinlock_t confirm_error_lock;
-extern int eeh_probe_mode;
static inline bool eeh_enabled(void)
{
- return eeh_subsystem_enabled;
+ if ((eeh_subsystem_flags & EEH_FORCE_DISABLED) ||
+ !(eeh_subsystem_flags & EEH_ENABLED))
+ return false;
+
+ return true;
}
static inline void eeh_set_enable(bool mode)
{
- eeh_subsystem_enabled = mode;
+ if (mode)
+ eeh_subsystem_flags |= EEH_ENABLED;
+ else
+ eeh_subsystem_flags &= ~EEH_ENABLED;
}
-#define EEH_PROBE_MODE_DEV (1<<0) /* From PCI device */
-#define EEH_PROBE_MODE_DEVTREE (1<<1) /* From device tree */
-
static inline void eeh_probe_mode_set(int flag)
{
- eeh_probe_mode = flag;
+ eeh_subsystem_flags |= flag;
}
static inline int eeh_probe_mode_devtree(void)
{
- return (eeh_probe_mode == EEH_PROBE_MODE_DEVTREE);
+ return (eeh_subsystem_flags & EEH_PROBE_MODE_DEVTREE);
}
static inline int eeh_probe_mode_dev(void)
{
- return (eeh_probe_mode == EEH_PROBE_MODE_DEV);
+ return (eeh_subsystem_flags & EEH_PROBE_MODE_DEV);
}
static inline void eeh_serialize_lock(unsigned long *flags)
