powerpc: Add System RAM to /proc/iomem

We've resisted adding System RAM to /proc/iomem because it is
the wrong place for it. Unfortunately we continue to find tools
that rely on this behaviour so give up and add it in.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 16da595ff402..2dd6bdd31fe1 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -34,6 +34,7 @@
 #include <linux/suspend.h>
 #include <linux/memblock.h>
 #include <linux/hugetlb.h>
+#include <linux/slab.h>
 
 #include <asm/pgalloc.h>
 #include <asm/prom.h>
@@ -555,3 +556,32 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
                 book3e_hugetlb_preload(vma->vm_mm, address, *ptep);
 #endif
 }
+
+/*
+ * System memory should not be in /proc/iomem but various tools expect it
+ * (eg kdump).
+ */
+static int add_system_ram_resources(void)
+{
+        struct memblock_region *reg;
+
+        for_each_memblock(memory, reg) {
+                struct resource *res;
+                unsigned long base = reg->base;
+                unsigned long size = reg->size;
+
+                res = kzalloc(sizeof(struct resource), GFP_KERNEL);
+                WARN_ON(!res);
+
+                if (res) {
+                        res->name = "System RAM";
+                        res->start = base;
+                        res->end = base + size - 1;
+                        res->flags = IORESOURCE_MEM;
+                        WARN_ON(request_resource(&iomem_resource, res) < 0);
+                }
+        }
+
+        return 0;
+}
+subsys_initcall(add_system_ram_resources);