x86: early_ioremap(), debugging
add early_ioremap() debug printouts via the early_ioremap_debug
boot option.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/x86/mm/ioremap_32.c b/arch/x86/mm/ioremap_32.c
index 4bcd5e0..30855c4 100644
--- a/arch/x86/mm/ioremap_32.c
+++ b/arch/x86/mm/ioremap_32.c
@@ -208,6 +208,17 @@
}
EXPORT_SYMBOL(iounmap);
+
+int __initdata early_ioremap_debug;
+
+static int __init early_ioremap_debug_setup(char *str)
+{
+ early_ioremap_debug = 1;
+
+ return 1;
+}
+__setup("early_ioremap_debug", early_ioremap_debug_setup);
+
static __initdata int after_paging_init;
static __initdata unsigned long bm_pte[1024]
__attribute__((aligned(PAGE_SIZE)));
@@ -226,6 +237,9 @@
{
unsigned long *pgd;
+ if (early_ioremap_debug)
+ printk("early_ioremap_init()\n");
+
pgd = early_ioremap_pgd(fix_to_virt(FIX_BTMAP_BEGIN));
*pgd = __pa(bm_pte) | _PAGE_TABLE;
memset(bm_pte, 0, sizeof(bm_pte));
@@ -236,6 +250,9 @@
{
unsigned long *pgd;
+ if (early_ioremap_debug)
+ printk("early_ioremap_clear()\n");
+
pgd = early_ioremap_pgd(fix_to_virt(FIX_BTMAP_BEGIN));
*pgd = 0;
__flush_tlb_all();
@@ -303,6 +320,11 @@
WARN_ON(system_state != SYSTEM_BOOTING);
nesting = early_ioremap_nested;
+ if (early_ioremap_debug) {
+ printk("early_ioremap(%08lx, %08lx) [%d] => ",
+ phys_addr, size, nesting);
+ dump_stack();
+ }
/* Don't allow wraparound or zero size */
last_addr = phys_addr + size - 1;
@@ -343,6 +365,8 @@
--idx;
--nrpages;
}
+ if (early_ioremap_debug)
+ printk(KERN_CONT "%08lx + %08lx\n", offset, fix_to_virt(idx0));
return (void*) (offset + fix_to_virt(idx0));
}
@@ -358,6 +382,11 @@
nesting = --early_ioremap_nested;
WARN_ON(nesting < 0);
+ if (early_ioremap_debug) {
+ printk("early_iounmap(%p, %08lx) [%d]\n", addr, size, nesting);
+ dump_stack();
+ }
+
virt_addr = (unsigned long)addr;
if (virt_addr < fix_to_virt(FIX_BTMAP_BEGIN)) {
WARN_ON(1);