[PATCH v1 09/14] xen/arm: Add cmdline boot option "pci=on"

[Rahul Singh <rahul.singh@xxxxxxx>]

Add cmdline boot option "pci=on" to enable/disable the PCI init during
boot.

Signed-off-by: Rahul Singh <rahul.singh@xxxxxxx>
---
 xen/arch/arm/pci/pci.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/xen/arch/arm/pci/pci.c b/xen/arch/arm/pci/pci.c
index d1c9cf997d..dc63bbc2a2 100644
--- a/xen/arch/arm/pci/pci.c
+++ b/xen/arch/arm/pci/pci.c
@@ -62,8 +62,38 @@ static void __init acpi_pci_init(void)
 static inline void __init acpi_pci_init(void) { }
 #endif
 
+static bool __initdata param_pci_enable;
+
+static int __init parse_pci_param(const char *arg)
+{
+    if ( !arg )
+    {
+        param_pci_enable = false;
+        return 0;
+    }
+
+    switch ( parse_bool(arg, NULL) )
+    {
+    case 0:
+        param_pci_enable = false;
+        return 0;
+    case 1:
+        param_pci_enable = true;
+        return 0;
+    }
+
+    return -EINVAL;
+}
+custom_param("pci", parse_pci_param);
+
 static int __init pci_init(void)
 {
+    /*
+     * Enable PCI when has been enabled explicitly (pci=on)
+     */
+    if ( !param_pci_enable)
+        return 0;
+
     if ( acpi_disabled )
         dt_pci_init();
     else
-- 
2.17.1