powerpc/eeh_cache: Add a way to dump the EEH address cache

Adds a debugfs file that can be read to view the contents of the EEH
address cache. This is pretty similar to the existing
eeh_addr_cache_print() function, but that function is intended to debug
issues inside of the kernel since it's #ifdef`ed out by default, and writes
into the kernel log.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Reviewed-by: Sam Bobroff <sbobroff@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h
index f3b3c35..e42d643 100644 (file)
--- a/arch/powerpc/include/asm/eeh.h
+++ b/arch/powerpc/include/asm/eeh.h
@@ -460,6 +460,9 @@ static inline void eeh_readsl(const volatile void __iomem *addr, void * buf,
                eeh_check_failure(addr);
 }
 
+
+void eeh_cache_debugfs_init(void);
+
 #endif /* CONFIG_PPC64 */
 #endif /* __KERNEL__ */
 #endif /* _POWERPC_EEH_H */

diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c
index 15e2734..8d36c50 100644 (file)
--- a/arch/powerpc/kernel/eeh.c
+++ b/arch/powerpc/kernel/eeh.c
@@ -1843,6 +1843,7 @@ static int __init eeh_init_proc(void)
                                           &eeh_enable_dbgfs_ops);
                debugfs_create_u32("eeh_max_freezes", 0600,
                                powerpc_debugfs_root, &eeh_max_freezes);
+               eeh_cache_debugfs_init();
 #endif
        }
 

diff --git a/arch/powerpc/kernel/eeh_cache.c b/arch/powerpc/kernel/eeh_cache.c
index b2c320e..5c5697c 100644 (file)
--- a/arch/powerpc/kernel/eeh_cache.c
+++ b/arch/powerpc/kernel/eeh_cache.c
@@ -26,6 +26,7 @@
 #include <linux/spinlock.h>
 #include <linux/atomic.h>
 #include <asm/pci-bridge.h>
+#include <asm/debugfs.h>
 #include <asm/ppc-pci.h>
 
 
@@ -298,9 +299,30 @@ void eeh_addr_cache_build(void)
                eeh_addr_cache_insert_dev(dev);
                eeh_sysfs_add_device(dev);
        }
+}
 
-#ifdef DEBUG
-       /* Verify tree built up above, echo back the list of addrs. */
-       eeh_addr_cache_print(&pci_io_addr_cache_root);
-#endif
+static int eeh_addr_cache_show(struct seq_file *s, void *v)
+{
+       struct pci_io_addr_range *piar;
+       struct rb_node *n;
+
+       spin_lock(&pci_io_addr_cache_root.piar_lock);
+       for (n = rb_first(&pci_io_addr_cache_root.rb_root); n; n = rb_next(n)) {
+               piar = rb_entry(n, struct pci_io_addr_range, rb_node);
+
+               seq_printf(s, "%s addr range [%pap-%pap]: %s\n",
+                      (piar->flags & IORESOURCE_IO) ? "i/o" : "mem",
+                      &piar->addr_lo, &piar->addr_hi, pci_name(piar->pcidev));
+       }
+       spin_unlock(&pci_io_addr_cache_root.piar_lock);
+
+       return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(eeh_addr_cache);
+
+void eeh_cache_debugfs_init(void)
+{
+       debugfs_create_file_unsafe("eeh_address_cache", 0400,
+                       powerpc_debugfs_root, NULL,
+                       &eeh_addr_cache_fops);
 }