[PATCH] x86: more debug print out with mtrr

Yinghai Lu
2009-03-12T03:06:40Z

Impact: more print out

remove unneeded mtrr_show

it will only printout one time by first cpu, so it is not big deal.

also print out directly from get_mtrr, because it doesn't update mtrr_state.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>

---
arch/x86/kernel/cpu/mtrr/generic.c | 93
+++++++++++++++++++------------------
1 file changed, 50 insertions(+), 43 deletions(-)

Index: linux-2.6/arch/x86/kernel/cpu/mtrr/generic.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/mtrr/generic.c
+++ linux-2.6/arch/x86/kernel/cpu/mtrr/generic.c
@@ -33,14 +33,6 @@ u64 mtrr_tom2;
struct mtrr_state_type mtrr_state = {};
EXPORT_SYMBOL_GPL(mtrr_state);

-static int __initdata mtrr_show;
-static int __init mtrr_debug(char *opt)
-{
- mtrr_show = 1;
- return 0;
-}
-early_param("mtrr.show", mtrr_debug);
-
/*
* Returns the effective MTRR type for the region
* Error returns:
@@ -193,13 +185,51 @@ static void print_fixed(unsigned base, u
unsigned i;

for (i = 0; i < 8; ++i, ++types, base += step)
- printk(KERN_INFO "MTRR %05X-%05X %s\n",
+ printk(KERN_INFO " %05X-%05X %s\n",
base, base + step - 1, mtrr_attrib_to_str(*types));
}

static void prepare_set(void);
static void post_set(void);

+static void __init print_mtrr_state(void)
+{
+ unsigned int i;
+ int high_width;
+
+ printk(KERN_INFO "MTRR default type: %s\n",
mtrr_attrib_to_str(mtrr_state.def_type));
+ if (mtrr_state.have_fixed) {
+ printk(KERN_INFO "MTRR fixed ranges %sabled:\n",
+ mtrr_state.enabled & 1 ? "en" : "dis");
+ print_fixed(0x00000, 0x10000, mtrr_state.fixed_ranges + 0);
+ for (i = 0; i < 2; ++i)
+ print_fixed(0x80000 + i * 0x20000, 0x04000,
mtrr_state.fixed_ranges + (i + 1) * 8);
+ for (i = 0; i < 8; ++i)
+ print_fixed(0xC0000 + i * 0x08000, 0x01000,
mtrr_state.fixed_ranges + (i + 3) * 8);
+ }
+ printk(KERN_INFO "MTRR variable ranges %sabled:\n",
+ mtrr_state.enabled & 2 ? "en" : "dis");
+ high_width = ((size_or_mask ? ffs(size_or_mask) - 1 : 32) - (32 -
PAGE_SHIFT) + 3) / 4;
+ for (i = 0; i < num_var_ranges; ++i) {
+ if (mtrr_state.var_ranges[i].mask_lo & (1 << 11))
+ printk(KERN_INFO " %u base %0*X%05X000 mask %0*X%05X000 %s\n",
+ i,
+ high_width,
+ mtrr_state.var_ranges[i].base_hi,
+ mtrr_state.var_ranges[i].base_lo >> 12,
+ high_width,
+ mtrr_state.var_ranges[i].mask_hi,
+ mtrr_state.var_ranges[i].mask_lo >> 12,
+ mtrr_attrib_to_str(mtrr_state.var_ranges[i].base_lo
& 0xff));
+ else
+ printk(KERN_INFO " %u disabled\n", i);
+ }
+ if (mtrr_tom2) {
+ printk(KERN_INFO "TOM2: %016llx aka %lldM\n",
+ mtrr_tom2, mtrr_tom2>>20);
+ }
+}
+
/* Grab all of the MTRR state for this CPU into *state */
void __init get_mtrr_state(void)
{
@@ -231,41 +261,9 @@ void __init get_mtrr_state(void)
mtrr_tom2 |= low;
mtrr_tom2 &= 0xffffff800000ULL;
}
- if (mtrr_show) {
- int high_width;

- printk(KERN_INFO "MTRR default type: %s\n",
mtrr_attrib_to_str(mtrr_state.def_type));
- if (mtrr_state.have_fixed) {
- printk(KERN_INFO "MTRR fixed ranges %sabled:\n",
- mtrr_state.enabled & 1 ? "en" : "dis");
- print_fixed(0x00000, 0x10000, mtrr_state.fixed_ranges + 0);
- for (i = 0; i < 2; ++i)
- print_fixed(0x80000 + i * 0x20000, 0x04000,
mtrr_state.fixed_ranges + (i + 1) * 8);
- for (i = 0; i < 8; ++i)
- print_fixed(0xC0000 + i * 0x08000, 0x01000,
mtrr_state.fixed_ranges + (i + 3) * 8);
- }
- printk(KERN_INFO "MTRR variable ranges %sabled:\n",
- mtrr_state.enabled & 2 ? "en" : "dis");
- high_width = ((size_or_mask ? ffs(size_or_mask) - 1 : 32) - (32
- PAGE_SHIFT) + 3) / 4;
- for (i = 0; i < num_var_ranges; ++i) {
- if (mtrr_state.var_ranges[i].mask_lo & (1 << 11))
- printk(KERN_INFO "MTRR %u base %0*X%05X000 mask
%0*X%05X000 %s\n",
- i,
- high_width,
- mtrr_state.var_ranges[i].base_hi,
- mtrr_state.var_ranges[i].base_lo >> 12,
- high_width,
- mtrr_state.var_ranges[i].mask_hi,
- mtrr_state.var_ranges[i].mask_lo >> 12,
-
mtrr_attrib_to_str(mtrr_state.var_ranges[i].base_lo & 0xff));
- else
- printk(KERN_INFO "MTRR %u disabled\n", i);
- }
- if (mtrr_tom2) {
- printk(KERN_INFO "TOM2: %016llx aka %lldM\n",
- mtrr_tom2, mtrr_tom2>>20);
- }
- }
+ print_mtrr_state();
+
mtrr_state_set = 1;

/* PAT setup for BP. We need to go through sync steps here */
@@ -377,7 +375,12 @@ static void generic_get_mtrr(unsigned in
unsigned int mask_lo, mask_hi, base_lo, base_hi;
unsigned int tmp, hi;

+ /*
+ * get_mtrr doesn't need to update mtrr_state, also it could be called
+ * from any cpu, so try to print it out directly.
+ */
rdmsr(MTRRphysMask_MSR(reg), mask_lo, mask_hi);
+
if ((mask_lo & 0x800) == 0) {
/* Invalid (i.e. free) range */
*base = 0;
@@ -407,6 +410,10 @@ static void generic_get_mtrr(unsigned in
*size = -mask_lo;
*base = base_hi << (32 - PAGE_SHIFT) | base_lo >> PAGE_SHIFT;
*type = base_lo & 0xff;
+
+ printk(KERN_DEBUG " get_mtrr: cpu%d reg%02d base=%010lx
size=%010lx %s\n",
+ smp_processor_id(), reg, *base, *size,
+ mtrr_attrib_to_str(*type & 0xff));
}

/**