PCI: prepare pci=realloc for multiple options

Let the user could enable and disable with pci=realloc=on or pci=realloc=off

Also
1. move variable and functions near the place they are used.
2. change macro to function
3. change related functions and variable to static and _init
4. update parameter description accordingly.

This will let us add a config option to control default behavior, and
still allow the user to turn off automatic reallocation if it fails on
their platform until a permanent solution is found.

-v2: still honor pci=realloc, and treat it as pci=realloc=on
     also use enum instead of ...
-v3: update kernel-paramenters.txt according to Jesse.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 27 insertions, 7 deletions

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 162edfb356b..219722df68d 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -48,13 +48,6 @@ static void free_list(struct list_head *head)
         }
 }
 
-int pci_realloc_enable = 0;
-#define pci_realloc_enabled() pci_realloc_enable
-void pci_realloc(void)
-{
-        pci_realloc_enable = 1;
-}
-
 /**
  * add_to_list() - add a new resource tracker to the list
  * @head:       Head of the list
@@ -1273,6 +1266,33 @@ static int __init pci_get_max_depth(void)
         return depth;
 }
 
+/*
+ * -1: undefined, will auto detect later
+ *  0: disabled by user
+ *  1: disabled by auto detect
+ *  2: enabled by user
+ *  3: enabled by auto detect
+ */
+enum enable_type {
+        undefined = -1,
+        user_disabled,
+        auto_disabled,
+        user_enabled,
+        auto_enabled,
+};
+
+static enum enable_type pci_realloc_enable __initdata = undefined;
+void __init pci_realloc_get_opt(char *str)
+{
+        if (!strncmp(str, "off", 3))
+                pci_realloc_enable = user_disabled;
+        else if (!strncmp(str, "on", 2))
+                pci_realloc_enable = user_enabled;
+}
+static bool __init pci_realloc_enabled(void)
+{
+        return pci_realloc_enable >= user_enabled;
+}
 
 /*
  * first try will not touch pci bridge res