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SubjectRe: [PATCH] x86: mtrr cleanup for converting continuous to discrete - auto detect
Yinghai Lu wrote:
> loop mtrr chunk_size and gran_size from 1M to 2G to find out optimal value.
>
> so user don't need to add mtrr_chunk_size and mtrr_gran_size,
>
> 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.

WOW :)

With this patch all is working fine , no RAM is lost , X is fast ,
so far everything else seems to work fine. \o/

I will test on 32bit tomorrow and stress the box later on today to be sure everything works fine.

There is my dmesg , meminfo , mtrr output with this patch on top x86-latest :

http://frugalware.org/~crazy/mtrr_x86-latest/

Yinghai thx for your work on that :)

>
> Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>

Tested-by: Gabriel Craciunescu <nix.or.die@googlemail.com>

>
> Index: linux-2.6/arch/x86/kernel/cpu/mtrr/main.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/kernel/cpu/mtrr/main.c
> +++ linux-2.6/arch/x86/kernel/cpu/mtrr/main.c
> @@ -610,28 +610,6 @@ static struct sysdev_driver mtrr_sysdev_
> .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,
> 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 +723,119 @@ static int __init cmp_range(const void *
> 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);
> +
> + 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 +862,34 @@ set_var_mtrr(unsigned int reg, unsigned
> 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 +908,12 @@ range_to_mtrr(unsigned int reg, unsigned
> 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 +922,12 @@ range_to_mtrr(unsigned int reg, unsigned
> 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 +935,86 @@ range_to_mtrr_with_hole(struct var_mtrr_
>
> 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 second_sizek;
> }
> - 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);
> - 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) {
> + 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);
> + return second_sizek;
> + }
> +
> + 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) {
> + 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);
>
> - if (range0_sizek > chunk_sizek)
> - range0_sizek -= chunk_sizek;
> - printk(KERN_INFO "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);
> + }
>
> 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);
> + if (range_basek + range_sizek > basek &&
> + range_basek + range_sizek <= (basek + sizek)) {
> + second_basek = basek;
> + second_sizek = range_basek + range_sizek - basek;
> + }
> +
> + if (range_sizek - (state->range_sizek - range0_sizek) - second_sizek
> + < (chunk_sizek >> 1)) {
> + hole_sizek = range_sizek - (state->range_sizek - range0_sizek)
> + - second_sizek;
> hole_basek = range_basek + range_sizek - hole_sizek;
> - } else
> + } else {
> 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 +1022,7 @@ set_var_mtrr_range(struct var_mtrr_state
> unsigned long size_pfn)
> {
> unsigned long basek, sizek;
> + unsigned long second_sizek = 0;
>
> if (state->reg >= num_var_ranges)
> return;
> @@ -901,21 +1031,19 @@ set_var_mtrr_range(struct var_mtrr_state
> 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 +1059,7 @@ static int __init parse_mtrr_chunk_size_
> 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 +1070,78 @@ static int __init parse_mtrr_gran_size_o
> }
> 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);
> +/* 2G, 1G, ..., 1M, so need 12 items and half maxtrix need 13*6 */
> +#define NUM_RESULT 78
>
> - return nr_range;
> -}
> +static struct mtrr_cleanup_result __initdata result[NUM_RESULT];
> +static struct res_range __initdata range_new[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;
> + long min_loss_pfn;
> + int index;
>
> /* extra one for all 0 */
> int num[MTRR_NUM_TYPES + 1];
> @@ -1038,10 +1153,20 @@ static int __init mtrr_cleanup(unsigned
> 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)
> @@ -1064,13 +1189,141 @@ static int __init mtrr_cleanup(unsigned
> extra_remove_base = 1 << (32 - PAGE_SHIFT);
> 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 */
> + 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) << (PAGE_SHIFT - 10);
> + result[i].bad = 1;
> + } else
> + result[i].lose_cover_sizek = (range_sums - range_sums_new) << (PAGE_SHIFT - 10);
> +
> + 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) {
> + printk(KERN_INFO "invalid mtrr_gran_size or mtrr_chunk_size, mtrr not changed\n");
> + return 0;
> + }
>
> - /* convert ranges to var ranges state */
> - x86_setup_var_mtrrs(range, nr_range, address_bits);
> + set_var_mtrr_all(address_bits);
> + return 1;
> + }
>
> - return 1;
> + i = 0;
> + min_loss_pfn = -1UL;
> + index = -1;
> + memset(result, 0, sizeof(result));
> + if (nr_mtrr_spare_reg >= num_var_ranges)
> + nr_mtrr_spare_reg = num_var_ranges - 1;
> + for (gran_size = (1ULL<<20); gran_size < (1ULL<<32); gran_size <<= 1) {
> + for (chunk_size = gran_size; chunk_size < (1ULL<<32);
> + 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) << (PAGE_SHIFT - 10);
> + result[i].bad = 1;
> + } else
> + result[i].lose_cover_sizek = (range_sums - range_sums_new) << (PAGE_SHIFT - 10);
> +
> + /* need to leave 2 entries for pci device for WB ?*/
> + if ((num_reg < num_var_ranges + 1 - nr_mtrr_spare_reg) && !result[i].bad) {
> + if (range_sums - range_sums_new < min_loss_pfn) {
> + min_loss_pfn = range_sums - range_sums_new;
> + index = i;
> + if (!min_loss_pfn)
> + break;
> + }
> + }
> + i++;
> + }
> + if (!min_loss_pfn)
> + break;
> + }
> +
> + if (index != -1 && !min_loss_pfn) {
> + printk(KERN_INFO "Found optimal setting for mtrr clean up\n");
> + i = index;
> + 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[index].chunk_sizek;
> + chunk_size <<= 10;
> + gran_size = result[index].gran_sizek;
> + gran_size <<= 10;
> + x86_setup_var_mtrrs(range, nr_range, chunk_size, gran_size);
> + set_var_mtrr_all(address_bits);
> +
> + return 1;
> + }
> +
> + 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);
> + }
> +
> + 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 +1364,8 @@ 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 +1392,8 @@ int __init mtrr_trim_uncached_memory(uns
> {
> 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 +1408,22 @@ int __init mtrr_trim_uncached_memory(uns
> 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 +1441,10 @@ int __init mtrr_trim_uncached_memory(uns
> /* 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 +1470,28 @@ int __init mtrr_trim_uncached_memory(uns
> }
> 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 +1581,10 @@ 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 +1624,7 @@ static int __init mtrr_init_finialize(vo
> 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
> Index: linux-2.6/Documentation/kernel-parameters.txt
> ===================================================================
> --- linux-2.6.orig/Documentation/kernel-parameters.txt
> +++ linux-2.6/Documentation/kernel-parameters.txt
> @@ -613,9 +613,17 @@ and is between 256 and 4096 characters.
> that could hold holes aka. UC entries.
>
> mtrr_gran_size=nn[KMG] [X86]
> - used for mtrr cleanup. It is granity of mtrr block.
> + used for mtrr cleanup. It is granularity of mtrr block.
> + default is 1.
> Big value could prevent small alignment use 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 need more.
> +
> disable_mtrr_trim [X86, Intel and AMD only]
> By default the kernel will trim any uncacheable
> memory out of your available memory pool based on
> Index: linux-2.6/arch/x86/Kconfig
> ===================================================================
> --- linux-2.6.orig/arch/x86/Kconfig
> +++ linux-2.6/arch/x86/Kconfig
> @@ -1099,6 +1099,15 @@ 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"
>


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