powerpc/eeh: Probe mode support

While EEH module is installed, PCI devices is checked one by one
to see if it supports eeh. On different platforms, the PCI devices
are referred through different ways when the EEH module is loaded.
For example, on pSeries platform, that is done by OF node. However,
we would do that by real PCI devices (struct pci_dev) on PowerNV
platform in future. So we needs some mechanism to differentiate
those cases by classifying them to probe modes, either from OF
nodes or real PCI devices.

The patch implements the support to eeh probe mode. Also, the
EEH on pSeries has set it into EEH_PROBE_MODE_DEVTREE. That means
the probe will be done based on OF nodes on pSeries platform.

In addition, On pSeries platform, it's done by OF nodes. The patch
moves the the probe function from EEH core to platform dependent
backend and some cleanup applied.

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

2 files changed, 22 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h
index 792d2d789751..895fd0d59ed7 100644
--- a/arch/powerpc/include/asm/eeh.h
+++ b/arch/powerpc/include/asm/eeh.h
@@ -129,6 +129,8 @@ static inline struct pci_dev *eeh_dev_to_pci_dev(struct eeh_dev *edev)
 struct eeh_ops {
         char *name;
         int (*init)(void);
+        void* (*of_probe)(struct device_node *dn, void *flag);
+        void* (*dev_probe)(struct pci_dev *dev, void *flag);
         int (*set_option)(struct eeh_pe *pe, int option);
         int (*get_pe_addr)(struct eeh_pe *pe);
         int (*get_state)(struct eeh_pe *pe, int *state);
@@ -143,6 +145,25 @@ struct eeh_ops {
 extern struct eeh_ops *eeh_ops;
 extern int eeh_subsystem_enabled;
 extern struct mutex eeh_mutex;
+extern int eeh_probe_mode;
+
+#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;
+}
+
+static inline int eeh_probe_mode_devtree(void)
+{
+        return (eeh_probe_mode == EEH_PROBE_MODE_DEVTREE);
+}
+
+static inline int eeh_probe_mode_dev(void)
+{
+        return (eeh_probe_mode == EEH_PROBE_MODE_DEV);
+}
 
 static inline void eeh_lock(void)
 {
diff --git a/arch/powerpc/include/asm/ppc-pci.h b/arch/powerpc/include/asm/ppc-pci.h
index 2a80f080a7ba..56d55c7fed9a 100644
--- a/arch/powerpc/include/asm/ppc-pci.h
+++ b/arch/powerpc/include/asm/ppc-pci.h
@@ -54,6 +54,7 @@ struct pci_dev *pci_addr_cache_get_device(unsigned long addr);
 void eeh_slot_error_detail(struct eeh_pe *pe, int severity);
 int eeh_pci_enable(struct eeh_pe *pe, int function);
 int eeh_reset_pe(struct eeh_pe *);
+void eeh_save_bars(struct eeh_dev *edev);
 int rtas_write_config(struct pci_dn *, int where, int size, u32 val);
 int rtas_read_config(struct pci_dn *, int where, int size, u32 *val);
 void eeh_pe_state_mark(struct eeh_pe *pe, int state);