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x86: mtrr_cleanup optimization, v2

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fix hpa's t61 with 4g ram:

   change layout from
	(n - 1)*chunksize + chunk_size - NC
   to
	n*chunksize - NC

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2008-09-27 00:30:08 -07:00 committed by Ingo Molnar
parent 7fc2368d1d
commit 2313c2793d
1 changed files with 37 additions and 42 deletions
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79
arch/x86/kernel/cpu/mtrr/main.c
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@ -970,6 +970,8 @@ range_to_mtrr_with_hole(struct var_mtrr_state *state, unsigned long basek,
/* try to append some small hole */
range0_basek = state->range_startk;
range0_sizek = ALIGN(state->range_sizek, chunk_sizek);
/* no increase */
if (range0_sizek == state->range_sizek) {
if (debug_print)
printk(KERN_DEBUG "rangeX: %016lx - %016lx\n",
@ -980,13 +982,13 @@ range_to_mtrr_with_hole(struct var_mtrr_state *state, unsigned long basek,
return 0;
}
range0_sizek -= chunk_sizek;
if (range0_sizek && sizek) {
while (range0_basek + range0_sizek > (basek + sizek)) {
range0_sizek -= chunk_sizek;
if (!range0_sizek)
break;
}
/* only cut back, when it is not the last */
if (sizek) {
while (range0_basek + range0_sizek > (basek + sizek)) {
range0_sizek -= chunk_sizek;
if (!range0_sizek)
break;
}
}
if (range0_sizek) {
@ -1000,46 +1002,39 @@ range_to_mtrr_with_hole(struct var_mtrr_state *state, unsigned long basek,
}
range_basek = range0_basek + range0_sizek;
range_sizek = chunk_sizek;
if (range_basek + range_sizek > basek &&
range_basek + range_sizek <= (basek + sizek)) {
/* one hole */
second_basek = basek;
second_sizek = range_basek + range_sizek - basek;
}
/* one hole in the middle */
if (range_basek > basek && range_basek <= (basek + sizek))
second_sizek = range_basek - basek;
/* if last piece, only could one hole near end */
if ((second_basek || !basek) &&
range_sizek - (state->range_sizek - range0_sizek) - second_sizek <
(chunk_sizek >> 1)) {
/*
* one hole in middle (second_sizek is 0) or at end
* (second_sizek is 0 )
*/
hole_sizek = range_sizek - (state->range_sizek - range0_sizek)
- second_sizek;
hole_basek = range_basek + range_sizek - hole_sizek
- second_sizek;
} else {
/* fallback for big hole, or several holes */
if (range0_sizek > state->range_sizek) {
unsigned long hole_basek, hole_sizek;
/* one hole in middle or at end */
hole_sizek = range0_sizek - state->range_sizek - second_sizek;
if (hole_sizek) {
hole_basek = range_basek - hole_sizek - second_sizek;
if (debug_print)
printk(KERN_DEBUG "hole: %016lx - %016lx\n",
hole_basek<<10,
(hole_basek + hole_sizek)<<10);
state->reg = range_to_mtrr(state->reg, hole_basek,
hole_sizek,
MTRR_TYPE_UNCACHABLE);
}
} else {
/* need to handle left over */
range_sizek = state->range_sizek - range0_sizek;
second_basek = 0;
second_sizek = 0;
}
if (debug_print)
printk(KERN_DEBUG "range: %016lx - %016lx\n", range_basek<<10,
(range_basek + range_sizek)<<10);
state->reg = range_to_mtrr(state->reg, range_basek, range_sizek,
if (range_sizek) {
if (debug_print)
printk(KERN_DEBUG "range: %016lx - %016lx\n",
range_basek<<10,
(range_basek + range_sizek)<<10);
state->reg = range_to_mtrr(state->reg, range_basek,
range_sizek,
MTRR_TYPE_WRBACK);
if (hole_sizek) {
if (debug_print)
printk(KERN_DEBUG "hole: %016lx - %016lx\n",
hole_basek<<10, (hole_basek + hole_sizek)<<10);
state->reg = range_to_mtrr(state->reg, hole_basek, hole_sizek,
MTRR_TYPE_UNCACHABLE);
}
}
return second_sizek;