Commit 12031a62 authored by Yinghai Lu's avatar Yinghai Lu Committed by Thomas Gleixner

x86: mtrr cleanup for converting continuous to discrete - auto detect v4

Loop through mtrr chunk_size and gran_size from 1M to 2G to find out
the optimal value so user does not need to add mtrr_chunk_size and
mtrr_gran_size to the kernel command line.

If optimal value is not found, print out all list to help select less
optimal value.

Add mtrr_spare_reg_nr= so user could set 2 instead of 1, if the card
need more entries.

v2: find the one with more spare entries
v3: fix hole_basek offset
v4: tight the compare between range and range_new
    loop stop with 4g
Signed-off-by: default avatarYinghai Lu <yhlu.kernel@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Gabriel C <nix.or.die@googlemail.com>
Cc: Mika Fischer <mika.fischer@zoopnet.de>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent f5098d62
......@@ -610,8 +610,17 @@ and is between 256 and 4096 characters. It is defined in the file
that could hold holes aka. UC entries.
mtrr_gran_size=nn[KMG] [X86]
used for mtrr cleanup. It is granity of mtrr block.
Big value could prevent small alignment use up MTRRs.
Used for mtrr cleanup. It is granularity of mtrr block.
Default is 1.
Large value could prevent small alignment from
using up MTRRs.
mtrr_spare_reg_nr=n [X86]
Format: <integer>
Range: 0,7 : spare reg number
Default : 1
Used for mtrr cleanup. It is spare mtrr entries number.
Set to 2 or more if your graphical card needs more.
disable_mtrr_trim [X86, Intel and AMD only]
By default the kernel will trim any uncacheable
......
......@@ -1117,6 +1117,15 @@ config MTRR_SANITIZER_ENABLE_DEFAULT
help
Enable mtrr cleanup default value
config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
int "MTRR cleanup spare reg num (0-7)"
range 0 7
default "1"
depends on MTRR_SANITIZER
help
mtrr cleanup spare entries default, it can be changed via
mtrr_spare_reg_nr=
config X86_PAT
bool
prompt "x86 PAT support"
......
......@@ -610,28 +610,6 @@ static struct sysdev_driver mtrr_sysdev_driver = {
.resume = mtrr_restore,
};
#ifdef CONFIG_MTRR_SANITIZER
static int enable_mtrr_cleanup __initdata = CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT;
#else
static int enable_mtrr_cleanup __initdata = -1;
#endif
static int __init disable_mtrr_cleanup_setup(char *str)
{
if (enable_mtrr_cleanup != -1)
enable_mtrr_cleanup = 0;
return 0;
}
early_param("disable_mtrr_cleanup", disable_mtrr_cleanup_setup);
static int __init enable_mtrr_cleanup_setup(char *str)
{
if (enable_mtrr_cleanup != -1)
enable_mtrr_cleanup = 1;
return 0;
}
early_param("enble_mtrr_cleanup", enable_mtrr_cleanup_setup);
/* should be related to MTRR_VAR_RANGES nums */
#define RANGE_NUM 256
......@@ -702,13 +680,15 @@ subtract_range(struct res_range *range, unsigned long start, unsigned long end)
continue;
}
if (start <= range[j].start && end < range[j].end && range[j].start < end + 1) {
if (start <= range[j].start && end < range[j].end &&
range[j].start < end + 1) {
range[j].start = end + 1;
continue;
}
if (start > range[j].start && end >= range[j].end && range[j].end > start - 1) {
if (start > range[j].start && end >= range[j].end &&
range[j].end > start - 1) {
range[j].end = start - 1;
continue;
}
......@@ -743,18 +723,123 @@ static int __init cmp_range(const void *x1, const void *x2)
return start1 - start2;
}
struct var_mtrr_range_state {
unsigned long base_pfn;
unsigned long size_pfn;
mtrr_type type;
};
struct var_mtrr_range_state __initdata range_state[RANGE_NUM];
static int __init
x86_get_mtrr_mem_range(struct res_range *range, int nr_range,
unsigned long extra_remove_base,
unsigned long extra_remove_size)
{
unsigned long i, base, size;
mtrr_type type;
for (i = 0; i < num_var_ranges; i++) {
type = range_state[i].type;
if (type != MTRR_TYPE_WRBACK)
continue;
base = range_state[i].base_pfn;
size = range_state[i].size_pfn;
nr_range = add_range_with_merge(range, nr_range, base,
base + size - 1);
}
printk(KERN_DEBUG "After WB checking\n");
for (i = 0; i < nr_range; i++)
printk(KERN_DEBUG "MTRR MAP PFN: %016lx - %016lx\n",
range[i].start, range[i].end + 1);
/* take out UC ranges */
for (i = 0; i < num_var_ranges; i++) {
type = range_state[i].type;
if (type != MTRR_TYPE_UNCACHABLE)
continue;
size = range_state[i].size_pfn;
if (!size)
continue;
base = range_state[i].base_pfn;
subtract_range(range, base, base + size - 1);
}
if (extra_remove_size)
subtract_range(range, extra_remove_base,
extra_remove_base + extra_remove_size - 1);
/* get new range num */
nr_range = 0;
for (i = 0; i < RANGE_NUM; i++) {
if (!range[i].end)
continue;
nr_range++;
}
printk(KERN_DEBUG "After UC checking\n");
for (i = 0; i < nr_range; i++)
printk(KERN_DEBUG "MTRR MAP PFN: %016lx - %016lx\n",
range[i].start, range[i].end + 1);
/* sort the ranges */
sort(range, nr_range, sizeof(struct res_range), cmp_range, NULL);
printk(KERN_DEBUG "After sorting\n");
for (i = 0; i < nr_range; i++)
printk(KERN_DEBUG "MTRR MAP PFN: %016lx - %016lx\n",
range[i].start, range[i].end + 1);
/* clear those is not used */
for (i = nr_range; i < RANGE_NUM; i++)
memset(&range[i], 0, sizeof(range[i]));
return nr_range;
}
static struct res_range __initdata range[RANGE_NUM];
#ifdef CONFIG_MTRR_SANITIZER
static unsigned long __init sum_ranges(struct res_range *range, int nr_range)
{
unsigned long sum;
int i;
sum = 0;
for (i = 0; i < nr_range; i++)
sum += range[i].end + 1 - range[i].start;
return sum;
}
static int enable_mtrr_cleanup __initdata =
CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT;
static int __init disable_mtrr_cleanup_setup(char *str)
{
if (enable_mtrr_cleanup != -1)
enable_mtrr_cleanup = 0;
return 0;
}
early_param("disable_mtrr_cleanup", disable_mtrr_cleanup_setup);
static int __init enable_mtrr_cleanup_setup(char *str)
{
if (enable_mtrr_cleanup != -1)
enable_mtrr_cleanup = 1;
return 0;
}
early_param("enble_mtrr_cleanup", enable_mtrr_cleanup_setup);
struct var_mtrr_state {
unsigned long range_startk;
unsigned long range_sizek;
unsigned long chunk_sizek;
unsigned long gran_sizek;
unsigned int reg;
unsigned int address_bits;
};
static void __init
set_var_mtrr(unsigned int reg, unsigned long basek, unsigned long sizek,
unsigned char type, unsigned address_bits)
unsigned char type, unsigned int address_bits)
{
u32 base_lo, base_hi, mask_lo, mask_hi;
u64 base, mask;
......@@ -781,10 +866,34 @@ set_var_mtrr(unsigned int reg, unsigned long basek, unsigned long sizek,
fill_mtrr_var_range(reg, base_lo, base_hi, mask_lo, mask_hi);
}
static void __init
save_var_mtrr(unsigned int reg, unsigned long basek, unsigned long sizek,
unsigned char type)
{
range_state[reg].base_pfn = basek >> (PAGE_SHIFT - 10);
range_state[reg].size_pfn = sizek >> (PAGE_SHIFT - 10);
range_state[reg].type = type;
}
static void __init
set_var_mtrr_all(unsigned int address_bits)
{
unsigned long basek, sizek;
unsigned char type;
unsigned int reg;
for (reg = 0; reg < num_var_ranges; reg++) {
basek = range_state[reg].base_pfn << (PAGE_SHIFT - 10);
sizek = range_state[reg].size_pfn << (PAGE_SHIFT - 10);
type = range_state[reg].type;
set_var_mtrr(reg, basek, sizek, type, address_bits);
}
}
static unsigned int __init
range_to_mtrr(unsigned int reg, unsigned long range_startk,
unsigned long range_sizek, unsigned char type,
unsigned address_bits)
unsigned long range_sizek, unsigned char type)
{
if (!range_sizek || (reg >= num_var_ranges))
return reg;
......@@ -803,12 +912,13 @@ range_to_mtrr(unsigned int reg, unsigned long range_startk,
align = max_align;
sizek = 1 << align;
printk(KERN_INFO "Setting variable MTRR %d, base: %ldMB, range: %ldMB, type %s\n",
printk(KERN_DEBUG "Setting variable MTRR %d, base: %ldMB, "
"range: %ldMB, type %s\n",
reg, range_startk >> 10, sizek >> 10,
(type == MTRR_TYPE_UNCACHABLE)?"UC":
((type == MTRR_TYPE_WRBACK)?"WB":"Other")
);
set_var_mtrr(reg++, range_startk, sizek, type, address_bits);
save_var_mtrr(reg++, range_startk, sizek, type);
range_startk += sizek;
range_sizek -= sizek;
if (reg >= num_var_ranges)
......@@ -817,10 +927,12 @@ range_to_mtrr(unsigned int reg, unsigned long range_startk,
return reg;
}
static void __init
range_to_mtrr_with_hole(struct var_mtrr_state *state, unsigned long basek)
static unsigned __init
range_to_mtrr_with_hole(struct var_mtrr_state *state, unsigned long basek,
unsigned long sizek)
{
unsigned long hole_basek, hole_sizek;
unsigned long second_basek, second_sizek;
unsigned long range0_basek, range0_sizek;
unsigned long range_basek, range_sizek;
unsigned long chunk_sizek;
......@@ -828,64 +940,95 @@ range_to_mtrr_with_hole(struct var_mtrr_state *state, unsigned long basek)
hole_basek = 0;
hole_sizek = 0;
second_basek = 0;
second_sizek = 0;
chunk_sizek = state->chunk_sizek;
gran_sizek = state->gran_sizek;
/* align with gran size, prevent small block used up MTRRs */
range_basek = ALIGN(state->range_startk, gran_sizek);
if ((range_basek > basek) && basek)
return;
range_sizek = ALIGN(state->range_sizek - (range_basek - state->range_startk), gran_sizek);
return second_sizek;
state->range_sizek -= (range_basek - state->range_startk);
range_sizek = ALIGN(state->range_sizek, gran_sizek);
while (range_basek + range_sizek > (state->range_startk + state->range_sizek)) {
while (range_sizek > state->range_sizek) {
range_sizek -= gran_sizek;
if (!range_sizek)
return;
return 0;
}
state->range_startk = range_basek;
state->range_sizek = range_sizek;
/* try to append some small hole */
range0_basek = state->range_startk;
range0_sizek = ALIGN(state->range_sizek, chunk_sizek);
if (range0_sizek == state->range_sizek) {
printk(KERN_INFO "rangeX: %016lx - %016lx\n", range0_basek<<10, (range0_basek + state->range_sizek)<<10);
printk(KERN_DEBUG "rangeX: %016lx - %016lx\n", range0_basek<<10,
(range0_basek + state->range_sizek)<<10);
state->reg = range_to_mtrr(state->reg, range0_basek,
state->range_sizek, MTRR_TYPE_WRBACK, state->address_bits);
return;
} else if (basek) {
while (range0_basek + range0_sizek - chunk_sizek > basek) {
state->range_sizek, MTRR_TYPE_WRBACK);
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;
}
}
if (range0_sizek > chunk_sizek)
range0_sizek -= chunk_sizek;
printk(KERN_INFO "range0: %016lx - %016lx\n", range0_basek<<10, (range0_basek + range0_sizek)<<10);
if (range0_sizek) {
printk(KERN_DEBUG "range0: %016lx - %016lx\n", range0_basek<<10,
(range0_basek + range0_sizek)<<10);
state->reg = range_to_mtrr(state->reg, range0_basek,
range0_sizek, MTRR_TYPE_WRBACK, state->address_bits);
range0_sizek, MTRR_TYPE_WRBACK);
}
range_basek = range0_basek + range0_sizek;
range_sizek = chunk_sizek;
if ((range_sizek - (state->range_sizek - range0_sizek) < (chunk_sizek >> 1)) &&
(range_basek + range_sizek <= basek)) {
hole_sizek = range_sizek - (state->range_sizek - range0_sizek);
hole_basek = range_basek + range_sizek - hole_sizek;
} else
if (range_basek + range_sizek > basek &&
range_basek + range_sizek <= (basek + sizek)) {
/* one hole */
second_basek = basek;
second_sizek = range_basek + range_sizek - 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 */
range_sizek = state->range_sizek - range0_sizek;
second_basek = 0;
second_sizek = 0;
}
printk(KERN_INFO "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, state->address_bits);
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) {
printk(KERN_INFO "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, state->address_bits);
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;
}
static void __init
......@@ -893,6 +1036,7 @@ set_var_mtrr_range(struct var_mtrr_state *state, unsigned long base_pfn,
unsigned long size_pfn)
{
unsigned long basek, sizek;
unsigned long second_sizek = 0;
if (state->reg >= num_var_ranges)
return;
......@@ -901,21 +1045,19 @@ set_var_mtrr_range(struct var_mtrr_state *state, unsigned long base_pfn,
sizek = size_pfn << (PAGE_SHIFT - 10);
/* See if I can merge with the last range */
if ((basek <= 1024) || (state->range_startk + state->range_sizek == basek)) {
if ((basek <= 1024) ||
(state->range_startk + state->range_sizek == basek)) {
unsigned long endk = basek + sizek;
state->range_sizek = endk - state->range_startk;
return;
}
/* Write the range mtrrs */
if (state->range_sizek != 0) {
range_to_mtrr_with_hole(state, basek);
if (state->range_sizek != 0)
second_sizek = range_to_mtrr_with_hole(state, basek, sizek);
state->range_startk = 0;
state->range_sizek = 0;
}
/* Allocate an msr */
state->range_startk = basek;
state->range_sizek = sizek;
state->range_startk = basek + second_sizek;
state->range_sizek = sizek - second_sizek;
}
/* mininum size of mtrr block that can take hole */
......@@ -931,7 +1073,7 @@ static int __init parse_mtrr_chunk_size_opt(char *p)
early_param("mtrr_chunk_size", parse_mtrr_chunk_size_opt);
/* granity of mtrr of block */
static u64 mtrr_gran_size __initdata = (1ULL<<20);
static u64 mtrr_gran_size __initdata;
static int __init parse_mtrr_gran_size_opt(char *p)
{
......@@ -942,91 +1084,84 @@ static int __init parse_mtrr_gran_size_opt(char *p)
}
early_param("mtrr_gran_size", parse_mtrr_gran_size_opt);
static void __init
static int nr_mtrr_spare_reg __initdata =
CONFIG_MTRR_SANITIZER_SPARE_REG_NR_DEFAULT;
static int __init parse_mtrr_spare_reg(char *arg)
{
if (arg)
nr_mtrr_spare_reg = simple_strtoul(arg, NULL, 0);
return 0;
}
early_param("mtrr_spare_reg_nr", parse_mtrr_spare_reg);
static int __init
x86_setup_var_mtrrs(struct res_range *range, int nr_range,
unsigned address_bits)
u64 chunk_size, u64 gran_size)
{
struct var_mtrr_state var_state;
int i;
int num_reg;
var_state.range_startk = 0;
var_state.range_sizek = 0;
var_state.reg = 0;
var_state.address_bits = address_bits;
var_state.chunk_sizek = mtrr_chunk_size >> 10;
var_state.gran_sizek = mtrr_gran_size >> 10;
var_state.chunk_sizek = chunk_size >> 10;
var_state.gran_sizek = gran_size >> 10;
memset(range_state, 0, sizeof(range_state));
/* Write the range etc */
for (i = 0; i < nr_range; i++)
set_var_mtrr_range(&var_state, range[i].start, range[i].end - range[i].start + 1);
set_var_mtrr_range(&var_state, range[i].start,
range[i].end - range[i].start + 1);
/* Write the last range */
range_to_mtrr_with_hole(&var_state, 0);
printk(KERN_INFO "DONE variable MTRRs\n");
if (var_state.range_sizek != 0)
range_to_mtrr_with_hole(&var_state, 0, 0);
printk(KERN_DEBUG "DONE variable MTRRs\n");
num_reg = var_state.reg;
/* Clear out the extra MTRR's */
while (var_state.reg < num_var_ranges) {
set_var_mtrr(var_state.reg, 0, 0, 0, var_state.address_bits);
save_var_mtrr(var_state.reg, 0, 0, 0);
var_state.reg++;
}
}
static int __init
x86_get_mtrr_mem_range(struct res_range *range, int nr_range,
unsigned long extra_remove_base,
unsigned long extra_remove_size)
{
unsigned long i, base, size;
mtrr_type type;
for (i = 0; i < num_var_ranges; i++) {
mtrr_if->get(i, &base, &size, &type);
if (type != MTRR_TYPE_WRBACK)
continue;
nr_range = add_range_with_merge(range, nr_range, base, base + size - 1);
}
printk(KERN_INFO "After WB checking\n");
for (i = 0; i < nr_range; i++)
printk(KERN_INFO "MTRR MAP PFN: %016lx - %016lx\n", range[i].start, range[i].end + 1);
/* take out UC ranges */
for (i = 0; i < num_var_ranges; i++) {
mtrr_if->get(i, &base, &size, &type);
if (type != MTRR_TYPE_UNCACHABLE)
continue;
if (!size)
continue;
subtract_range(range, base, base + size - 1);
}
if (extra_remove_size)
subtract_range(range, extra_remove_base, extra_remove_base + extra_remove_size - 1);
return num_reg;
}
/* get new range num */
nr_range = 0;
for (i = 0; i < RANGE_NUM; i++) {
if (!range[i].end)
continue;
nr_range++;
}
printk(KERN_INFO "After UC checking\n");
for (i = 0; i < nr_range; i++)
printk(KERN_INFO "MTRR MAP PFN: %016lx - %016lx\n", range[i].start, range[i].end + 1);
struct mtrr_cleanup_result {
unsigned long gran_sizek;
unsigned long chunk_sizek;
unsigned long lose_cover_sizek;
unsigned int num_reg;
int bad;
};
/* sort the ranges */
sort(range, nr_range, sizeof(struct res_range), cmp_range, NULL);
printk(KERN_INFO "After sorting\n");
for (i = 0; i < nr_range; i++)
printk(KERN_INFO "MTRR MAP PFN: %016lx - %016lx\n", range[i].start, range[i].end + 1);
/*
* gran_size: 1M, 2M, ..., 2G
* chunk size: gran_size, ..., 4G
* so we need (2+13)*6
*/
#define NUM_RESULT 90
#define PSHIFT (PAGE_SHIFT - 10)
return nr_range;
}
static struct mtrr_cleanup_result __initdata result[NUM_RESULT];
static struct res_range __initdata range_new[RANGE_NUM];
static unsigned long __initdata min_loss_pfn[RANGE_NUM];
static int __init mtrr_cleanup(unsigned address_bits)
{
unsigned long extra_remove_base, extra_remove_size;
unsigned long i, base, size, def, dummy;
struct res_range range[RANGE_NUM];
mtrr_type type;
int nr_range;
int nr_range, nr_range_new;
u64 chunk_size, gran_size;
unsigned long range_sums, range_sums_new;
int index_good;
int num_reg_good;
/* extra one for all 0 */
int num[MTRR_NUM_TYPES + 1];
......@@ -1038,10 +1173,20 @@ static int __init mtrr_cleanup(unsigned address_bits)
if (def != MTRR_TYPE_UNCACHABLE)
return 0;
/* get it and store it aside */
memset(range_state, 0, sizeof(range_state));
for (i = 0; i < num_var_ranges; i++) {
mtrr_if->get(i, &base, &size, &type);
range_state[i].base_pfn = base;
range_state[i].size_pfn = size;
range_state[i].type = type;
}
/* check entries number */
memset(num, 0, sizeof(num));
for (i = 0; i < num_var_ranges; i++) {
mtrr_if->get(i, &base, &size, &type);
type = range_state[i].type;
size = range_state[i].size_pfn;
if (type >= MTRR_NUM_TYPES)
continue;
if (!size)
......@@ -1062,15 +1207,172 @@ static int __init mtrr_cleanup(unsigned address_bits)
extra_remove_size = 0;
if (mtrr_tom2) {
extra_remove_base = 1 << (32 - PAGE_SHIFT);
extra_remove_size = (mtrr_tom2>>PAGE_SHIFT) - extra_remove_base;
extra_remove_size =
(mtrr_tom2 >> PAGE_SHIFT) - extra_remove_base;
}
nr_range = x86_get_mtrr_mem_range(range, 0, extra_remove_base, extra_remove_size);
nr_range = x86_get_mtrr_mem_range(range, 0, extra_remove_base,
extra_remove_size);
range_sums = sum_ranges(range, nr_range);
printk(KERN_INFO "total RAM coverred: %ldM\n",
range_sums >> (20 - PAGE_SHIFT));
if (mtrr_chunk_size && mtrr_gran_size) {
int num_reg;
/* convert ranges to var ranges state */
x86_setup_var_mtrrs(range, nr_range, address_bits);
num_reg = x86_setup_var_mtrrs(range, nr_range, mtrr_chunk_size,
mtrr_gran_size);
/* we got new setting in range_state, check it */
memset(range_new, 0, sizeof(range_new));
nr_range_new = x86_get_mtrr_mem_range(range_new, 0,
extra_remove_base,
extra_remove_size);
range_sums_new = sum_ranges(range_new, nr_range_new);
i = 0;
result[i].chunk_sizek = mtrr_chunk_size >> 10;
result[i].gran_sizek = mtrr_gran_size >> 10;
result[i].num_reg = num_reg;
if (range_sums < range_sums_new) {
result[i].lose_cover_sizek =
(range_sums_new - range_sums) << PSHIFT;
result[i].bad = 1;
} else
result[i].lose_cover_sizek =
(range_sums - range_sums_new) << PSHIFT;
printk(KERN_INFO " %sgran_size: %ldM \tchunk_size: %ldM \t",
result[i].bad?" BAD ":"", result[i].gran_sizek >> 10,
result[i].chunk_sizek >> 10);
printk(KERN_CONT "num_reg: %d \tlose cover RAM: %s%ldM \n",
result[i].num_reg, result[i].bad?"-":"",
result[i].lose_cover_sizek >> 10);
if (!result[i].bad) {
set_var_mtrr_all(address_bits);
return 1;
}
printk(KERN_INFO "invalid mtrr_gran_size or mtrr_chunk_size, "
"will find optimal one\n");
memset(result, 0, sizeof(result[0]));
}
i = 0;
memset(min_loss_pfn, 0xff, sizeof(min_loss_pfn));
memset(result, 0, sizeof(result));
for (gran_size = (1ULL<<20); gran_size < (1ULL<<32); gran_size <<= 1) {
for (chunk_size = gran_size; chunk_size < (1ULL<<33);
chunk_size <<= 1) {
int num_reg;
printk(KERN_INFO
"\ngran_size: %lldM chunk_size_size: %lldM\n",
gran_size >> 20, chunk_size >> 20);
if (i >= NUM_RESULT)
continue;
/* convert ranges to var ranges state */
num_reg = x86_setup_var_mtrrs(range, nr_range,
chunk_size, gran_size);
/* we got new setting in range_state, check it */
memset(range_new, 0, sizeof(range_new));
nr_range_new = x86_get_mtrr_mem_range(range_new, 0,
extra_remove_base, extra_remove_size);
range_sums_new = sum_ranges(range_new, nr_range_new);
result[i].chunk_sizek = chunk_size >> 10;
result[i].gran_sizek = gran_size >> 10;
result[i].num_reg = num_reg;
if (range_sums < range_sums_new) {
result[i].lose_cover_sizek =
(range_sums_new - range_sums) << PSHIFT;
result[i].bad = 1;
} else
result[i].lose_cover_sizek =
(range_sums - range_sums_new) << PSHIFT;
/* double check it */
if (!result[i].bad && !result[i].lose_cover_sizek) {
if (nr_range_new != nr_range ||
memcmp(range, range_new, sizeof(range)))
result[i].bad = 1;
}
if (!result[i].bad && (range_sums - range_sums_new <
min_loss_pfn[num_reg])) {
min_loss_pfn[num_reg] =
range_sums - range_sums_new;
}
i++;
}
}
/* print out all */
for (i = 0; i < NUM_RESULT; i++) {
printk(KERN_INFO "%sgran_size: %ldM \tchunk_size: %ldM \t",
result[i].bad?"*BAD* ":" ", result[i].gran_sizek >> 10,
result[i].chunk_sizek >> 10);
printk(KERN_CONT "num_reg: %d \tlose cover RAM: %s%ldM \n",
result[i].num_reg, result[i].bad?"-":"",
result[i].lose_cover_sizek >> 10);
}
/* try to find the optimal index */
if (nr_mtrr_spare_reg >= num_var_ranges)
nr_mtrr_spare_reg = num_var_ranges - 1;
num_reg_good = -1;
for (i = 1; i < num_var_ranges + 1 - nr_mtrr_spare_reg; i++) {
if (!min_loss_pfn[i]) {
num_reg_good = i;
break;
}
}
index_good = -1;
if (num_reg_good != -1) {
for (i = 0; i < NUM_RESULT; i++) {
if (!result[i].bad &&
result[i].num_reg == num_reg_good &&
!result[i].lose_cover_sizek) {
index_good = i;
break;
}
}
}
if (index_good != -1) {
printk(KERN_INFO "Found optimal setting for mtrr clean up\n");
i = index_good;
printk(KERN_INFO "gran_size: %ldM \tchunk_size: %ldM \t",
result[i].gran_sizek >> 10,
result[i].chunk_sizek >> 10);
printk(KERN_CONT "num_reg: %d \tlose cover RAM: %ldM \n",
result[i].num_reg,
result[i].lose_cover_sizek >> 10);
/* convert ranges to var ranges state */
chunk_size = result[i].chunk_sizek;
chunk_size <<= 10;
gran_size = result[i].gran_sizek;
gran_size <<= 10;
x86_setup_var_mtrrs(range, nr_range, chunk_size, gran_size);
set_var_mtrr_all(address_bits);
return 1;
}
printk(KERN_INFO "mtrr_cleanup: can not find optimal value\n");
printk(KERN_INFO "please specify mtrr_gran_size/mtrr_chunk_size\n");
return 0;
}
#else
static int __init mtrr_cleanup(unsigned address_bits)
{
return 0;
}
#endif
static int __initdata changed_by_mtrr_cleanup;
static int disable_mtrr_trim;
......@@ -1111,7 +1413,8 @@ int __init amd_special_default_mtrr(void)
return 0;
}
static u64 __init real_trim_memory(unsigned long start_pfn, unsigned long limit_pfn)
static u64 __init real_trim_memory(unsigned long start_pfn,
unsigned long limit_pfn)
{
u64 trim_start, trim_size;
trim_start = start_pfn;
......@@ -1138,9 +1441,8 @@ int __init mtrr_trim_uncached_memory(unsigned long end_pfn)
{
unsigned long i, base, size, highest_pfn = 0, def, dummy;
mtrr_type type;
struct res_range range[RANGE_NUM];
int nr_range;
u64 total_real_trim_size;
u64 total_trim_size;
/* extra one for all 0 */
int num[MTRR_NUM_TYPES + 1];
......@@ -1155,11 +1457,22 @@ int __init mtrr_trim_uncached_memory(unsigned long end_pfn)
if (def != MTRR_TYPE_UNCACHABLE)
return 0;
/* Find highest cached pfn */
/* get it and store it aside */
memset(range_state, 0, sizeof(range_state));
for (i = 0; i < num_var_ranges; i++) {
mtrr_if->get(i, &base, &size, &type);
range_state[i].base_pfn = base;
range_state[i].size_pfn = size;
range_state[i].type = type;
}
/* Find highest cached pfn */
for (i = 0; i < num_var_ranges; i++) {
type = range_state[i].type;
if (type != MTRR_TYPE_WRBACK)
continue;
base = range_state[i].base_pfn;
size = range_state[i].size_pfn;
if (highest_pfn < base + size)
highest_pfn = base + size;
}
......@@ -1177,9 +1490,10 @@ int __init mtrr_trim_uncached_memory(unsigned long end_pfn)
/* check entries number */
memset(num, 0, sizeof(num));
for (i = 0; i < num_var_ranges; i++) {
mtrr_if->get(i, &base, &size, &type);
type = range_state[i].type;
if (type >= MTRR_NUM_TYPES)
continue;
size = range_state[i].size_pfn;
if (!size)
type = MTRR_NUM_TYPES;
num[type]++;
......@@ -1205,26 +1519,28 @@ int __init mtrr_trim_uncached_memory(unsigned long end_pfn)
}
nr_range = x86_get_mtrr_mem_range(range, nr_range, 0, 0);
total_real_trim_size = 0;
total_trim_size = 0;
/* check the head */
if (range[0].start)
total_real_trim_size += real_trim_memory(0, range[0].start);
total_trim_size += real_trim_memory(0, range[0].start);
/* check the holes */
for (i = 0; i < nr_range - 1; i++) {
if (range[i].end + 1 < range[i+1].start)
total_real_trim_size += real_trim_memory(range[i].end + 1, range[i+1].start);
total_trim_size += real_trim_memory(range[i].end + 1,
range[i+1].start);
}
/* check the top */
i = nr_range - 1;
if (range[i].end + 1 < end_pfn)
total_real_trim_size += real_trim_memory(range[i].end + 1, end_pfn);
total_trim_size += real_trim_memory(range[i].end + 1,
end_pfn);
if (total_real_trim_size) {
if (total_trim_size) {
printk(KERN_WARNING "WARNING: BIOS bug: CPU MTRRs don't cover"
" all of memory, losing %lluMB of RAM.\n",
total_real_trim_size >> 20);
total_trim_size >> 20);
if (enable_mtrr_cleanup < 1)
if (!changed_by_mtrr_cleanup)
WARN_ON(1);
printk(KERN_INFO "update e820 for mtrr\n");
......@@ -1314,8 +1630,10 @@ void __init mtrr_bp_init(void)
if (use_intel()) {
get_mtrr_state();
if (mtrr_cleanup(phys_addr))
if (mtrr_cleanup(phys_addr)) {
changed_by_mtrr_cleanup = 1;
mtrr_if->set_all();
}
}
}
......@@ -1355,7 +1673,7 @@ static int __init mtrr_init_finialize(void)
if (!mtrr_if)
return 0;
if (use_intel()) {
if (enable_mtrr_cleanup < 1)
if (!changed_by_mtrr_cleanup)
mtrr_state_warn();
} else {
/* The CPUs haven't MTRR and seem to not support SMP. They have
......
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