x86: mtrr cleanup for converting continuous to discrete layout, v8
some BIOS like to use continus MTRR layout, and X driver can not add
WB entries for graphical cards when 4g or more RAM installed.
the patch will change MTRR to discrete.
mtrr_chunk_size= could be used to have smaller continuous block to hold holes.
default is 256m, could be set according to size of graphics card memory.
mtrr_gran_size= could be used to send smallest mtrr block to avoid run out of MTRRs
v2: fix -1 for UC checking
v3: default to disable, and need use enable_mtrr_cleanup to enable this feature
skip the var state change warning.
remove next_basek in range_to_mtrr()
v4: correct warning mask.
v5: CONFIG_MTRR_SANITIZER
v6: fix 1g, 2g, 512 aligment with extra hole
v7: gran_sizek to prevent running out of MTRRs.
v8: fix hole_basek caculation caused when removing next_basek
gran_sizek using when basek is 0.
need to apply
[PATCH] x86: fix trimming e820 with MTRR holes.
right after this one.
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Yinghai Lu
Thomas Gleixner
parent
0dbfafa5fc
commit
95ffa2438d
5 changed files with 528 additions and 14 deletions
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@ -599,6 +599,20 @@ and is between 256 and 4096 characters. It is defined in the file
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See drivers/char/README.epca and
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Documentation/digiepca.txt.
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disable_mtrr_cleanup [X86]
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enable_mtrr_cleanup [X86]
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The kernel tries to adjust MTRR layout from continuous
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to discrete, to make X server driver able to add WB
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entry later. This parameter enables/disables that.
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mtrr_chunk_size=nn[KMG] [X86]
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used for mtrr cleanup. It is largest continous chunk
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that could hold holes aka. UC entries.
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mtrr_gran_size=nn[KMG] [X86]
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used for mtrr cleanup. It is granity of mtrr block.
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Big value could prevent small alignment use up MTRRs.
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disable_mtrr_trim [X86, Intel and AMD only]
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By default the kernel will trim any uncacheable
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memory out of your available memory pool based on
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@ -1092,6 +1092,32 @@ config MTRR
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See <file:Documentation/mtrr.txt> for more information.
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config MTRR_SANITIZER
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def_bool y
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prompt "MTRR cleanup support"
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depends on MTRR
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help
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Convert MTRR layout from continuous to discrete, so some X driver
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could add WB entries.
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Say N here if you see bootup problems (boot crash, boot hang,
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spontaneous reboots).
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Could be disabled with disable_mtrr_cleanup. Also mtrr_chunk_size
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could be used to send largest mtrr entry size for continuous block
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to hold holes (aka. UC entries)
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If unsure, say Y.
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config MTRR_SANITIZER_ENABLE_DEFAULT
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def_bool y
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prompt "Enable MTRR cleanup by default"
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depends on MTRR_SANITIZER
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help
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Enable mtrr cleanup by default
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If unsure, say Y.
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config X86_PAT
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bool
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prompt "x86 PAT support"
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@ -37,7 +37,7 @@ static struct fixed_range_block fixed_range_blocks[] = {
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static unsigned long smp_changes_mask;
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static struct mtrr_state mtrr_state = {};
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static int mtrr_state_set;
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static u64 tom2;
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u64 mtrr_tom2;
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#undef MODULE_PARAM_PREFIX
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#define MODULE_PARAM_PREFIX "mtrr."
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@ -139,8 +139,8 @@ u8 mtrr_type_lookup(u64 start, u64 end)
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}
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}
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if (tom2) {
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if (start >= (1ULL<<32) && (end < tom2))
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if (mtrr_tom2) {
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if (start >= (1ULL<<32) && (end < mtrr_tom2))
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return MTRR_TYPE_WRBACK;
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}
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@ -158,6 +158,20 @@ get_mtrr_var_range(unsigned int index, struct mtrr_var_range *vr)
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rdmsr(MTRRphysMask_MSR(index), vr->mask_lo, vr->mask_hi);
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}
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/* fill the MSR pair relating to a var range */
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void fill_mtrr_var_range(unsigned int index,
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u32 base_lo, u32 base_hi, u32 mask_lo, u32 mask_hi)
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{
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struct mtrr_var_range *vr;
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vr = mtrr_state.var_ranges;
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vr[index].base_lo = base_lo;
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vr[index].base_hi = base_hi;
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vr[index].mask_lo = mask_lo;
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vr[index].mask_hi = mask_hi;
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}
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static void
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get_fixed_ranges(mtrr_type * frs)
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{
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@ -216,10 +230,10 @@ void __init get_mtrr_state(void)
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unsigned low, high;
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/* TOP_MEM2 */
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rdmsr(MSR_K8_TOP_MEM2, low, high);
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tom2 = high;
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tom2 <<= 32;
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tom2 |= low;
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tom2 &= 0xffffff8000000ULL;
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mtrr_tom2 = high;
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mtrr_tom2 <<= 32;
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mtrr_tom2 |= low;
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mtrr_tom2 &= 0xffffff8000000ULL;
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}
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if (mtrr_show) {
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int high_width;
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@ -251,9 +265,9 @@ void __init get_mtrr_state(void)
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else
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printk(KERN_INFO "MTRR %u disabled\n", i);
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}
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if (tom2) {
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if (mtrr_tom2) {
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printk(KERN_INFO "TOM2: %016llx aka %lldM\n",
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tom2, tom2>>20);
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mtrr_tom2, mtrr_tom2>>20);
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}
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}
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mtrr_state_set = 1;
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@ -37,6 +37,7 @@
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#include <linux/smp.h>
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#include <linux/cpu.h>
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#include <linux/mutex.h>
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#include <linux/sort.h>
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#include <asm/e820.h>
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#include <asm/mtrr.h>
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@ -609,6 +610,452 @@ static struct sysdev_driver mtrr_sysdev_driver = {
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.resume = mtrr_restore,
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};
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#ifdef CONFIG_MTRR_SANITIZER
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#ifdef CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT
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static int enable_mtrr_cleanup __initdata = 1;
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#else
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static int enable_mtrr_cleanup __initdata;
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#endif
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#else
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static int enable_mtrr_cleanup __initdata = -1;
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#endif
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static int __init disable_mtrr_cleanup_setup(char *str)
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{
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if (enable_mtrr_cleanup != -1)
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enable_mtrr_cleanup = 0;
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return 0;
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}
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early_param("disable_mtrr_cleanup", disable_mtrr_cleanup_setup);
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static int __init enable_mtrr_cleanup_setup(char *str)
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{
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if (enable_mtrr_cleanup != -1)
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enable_mtrr_cleanup = 1;
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return 0;
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}
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early_param("enble_mtrr_cleanup", enable_mtrr_cleanup_setup);
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#define RANGE_NUM 256
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struct res_range {
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unsigned long start;
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unsigned long end;
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};
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static int __init add_range(struct res_range *range, int nr_range, unsigned long start,
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unsigned long end, int merge)
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{
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int i;
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if (!merge)
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goto addit;
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/* try to merge it with old one */
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for (i = 0; i < nr_range; i++) {
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unsigned long final_start, final_end;
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unsigned long common_start, common_end;
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if (!range[i].end)
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continue;
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common_start = max(range[i].start, start);
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common_end = min(range[i].end, end);
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if (common_start > common_end + 1)
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continue;
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final_start = min(range[i].start, start);
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final_end = max(range[i].end, end);
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range[i].start = final_start;
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range[i].end = final_end;
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return nr_range;
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}
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addit:
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/* need to add that */
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if (nr_range >= RANGE_NUM)
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return nr_range;
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range[nr_range].start = start;
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range[nr_range].end = end;
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nr_range++;
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return nr_range;
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}
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static void __init subtract_range(struct res_range *range, unsigned long start,
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unsigned long end)
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{
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int i;
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int j;
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for (j = 0; j < RANGE_NUM; j++) {
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if (!range[j].end)
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continue;
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if (start <= range[j].start && end >= range[j].end) {
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range[j].start = 0;
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range[j].end = 0;
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continue;
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}
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if (start <= range[j].start && end < range[j].end && range[j].start < end + 1) {
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range[j].start = end + 1;
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continue;
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}
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if (start > range[j].start && end >= range[j].end && range[j].end > start - 1) {
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range[j].end = start - 1;
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continue;
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}
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if (start > range[j].start && end < range[j].end) {
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/* find the new spare */
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for (i = 0; i < RANGE_NUM; i++) {
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if (range[i].end == 0)
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break;
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}
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if (i < RANGE_NUM) {
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range[i].end = range[j].end;
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range[i].start = end + 1;
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} else {
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printk(KERN_ERR "run of slot in ranges\n");
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}
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range[j].end = start - 1;
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continue;
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}
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}
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}
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static int __init cmp_range(const void *x1, const void *x2)
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{
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const struct res_range *r1 = x1;
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const struct res_range *r2 = x2;
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long start1, start2;
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start1 = r1->start;
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start2 = r2->start;
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return start1 - start2;
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}
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struct var_mtrr_state {
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unsigned long range_startk, range_sizek;
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unsigned long chunk_sizek;
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unsigned long gran_sizek;
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unsigned int reg;
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unsigned address_bits;
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};
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static void __init set_var_mtrr(
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unsigned int reg, unsigned long basek, unsigned long sizek,
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unsigned char type, unsigned address_bits)
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{
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u32 base_lo, base_hi, mask_lo, mask_hi;
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unsigned address_mask_high;
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if (!sizek) {
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fill_mtrr_var_range(reg, 0, 0, 0, 0);
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return;
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}
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address_mask_high = ((1u << (address_bits - 32u)) - 1u);
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base_hi = basek >> 22;
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base_lo = basek << 10;
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if (sizek < 4*1024*1024) {
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mask_hi = address_mask_high;
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mask_lo = ~((sizek << 10) - 1);
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} else {
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mask_hi = address_mask_high & (~((sizek >> 22) - 1));
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mask_lo = 0;
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}
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base_lo |= type;
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mask_lo |= 0x800;
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fill_mtrr_var_range(reg, base_lo, base_hi, mask_lo, mask_hi);
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}
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static unsigned int __init range_to_mtrr(unsigned int reg,
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unsigned long range_startk, unsigned long range_sizek,
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unsigned char type, unsigned address_bits)
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{
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if (!range_sizek || (reg >= num_var_ranges))
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return reg;
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while (range_sizek) {
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unsigned long max_align, align;
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unsigned long sizek;
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/* Compute the maximum size I can make a range */
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if (range_startk)
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max_align = ffs(range_startk) - 1;
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else
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max_align = 32;
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align = fls(range_sizek) - 1;
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if (align > max_align)
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align = max_align;
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sizek = 1 << align;
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printk(KERN_INFO "Setting variable MTRR %d, base: %ldMB, range: %ldMB, type %s\n",
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reg, range_startk >> 10, sizek >> 10,
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(type == MTRR_TYPE_UNCACHABLE)?"UC":
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((type == MTRR_TYPE_WRBACK)?"WB":"Other")
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);
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set_var_mtrr(reg++, range_startk, sizek, type, address_bits);
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range_startk += sizek;
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range_sizek -= sizek;
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if (reg >= num_var_ranges)
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break;
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}
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return reg;
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}
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static void __init range_to_mtrr_with_hole(struct var_mtrr_state *state, unsigned long basek)
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{
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unsigned long hole_basek, hole_sizek;
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unsigned long range0_basek, range0_sizek;
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unsigned long range_basek, range_sizek;
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unsigned long chunk_sizek;
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unsigned long gran_sizek;
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hole_basek = 0;
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hole_sizek = 0;
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chunk_sizek = state->chunk_sizek;
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gran_sizek = state->gran_sizek;
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/* align with gran size, prevent small block used up MTRRs */
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range_basek = ALIGN(state->range_startk, gran_sizek);
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if ((range_basek > basek) && basek)
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return;
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range_sizek = ALIGN(state->range_sizek - (range_basek - state->range_startk), gran_sizek);
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while (range_basek + range_sizek > (state->range_startk + state->range_sizek)) {
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range_sizek -= gran_sizek;
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if (!range_sizek)
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return;
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}
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state->range_startk = range_basek;
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state->range_sizek = range_sizek;
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/* try to append some small hole */
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range0_basek = state->range_startk;
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range0_sizek = ALIGN(state->range_sizek, chunk_sizek);
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if ((range0_sizek == state->range_sizek) ||
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((range0_basek + range0_sizek - chunk_sizek > basek) && basek)) {
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printk(KERN_INFO "rangeX: %016lx - %016lx\n", range0_basek<<10, (range0_basek + state->range_sizek)<<10);
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state->reg = range_to_mtrr(state->reg, range0_basek,
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state->range_sizek, MTRR_TYPE_WRBACK, state->address_bits);
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return;
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}
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range0_sizek -= chunk_sizek;
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printk(KERN_INFO "range0: %016lx - %016lx\n", range0_basek<<10, (range0_basek + range0_sizek)<<10);
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state->reg = range_to_mtrr(state->reg, range0_basek,
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range0_sizek, MTRR_TYPE_WRBACK, state->address_bits);
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range_basek = range0_basek + range0_sizek;
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range_sizek = chunk_sizek;
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if (range_sizek - (state->range_sizek - range0_sizek) < (chunk_sizek >> 1)) {
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hole_sizek = range_sizek - (state->range_sizek - range0_sizek);
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hole_basek = range_basek + range_sizek - hole_sizek;
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} else
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range_sizek = state->range_sizek - range0_sizek;
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printk(KERN_INFO "range: %016lx - %016lx\n", range_basek<<10, (range_basek + range_sizek)<<10);
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state->reg = range_to_mtrr(state->reg, range_basek,
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range_sizek, MTRR_TYPE_WRBACK, state->address_bits);
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if (hole_sizek) {
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printk(KERN_INFO "hole: %016lx - %016lx\n", hole_basek<<10, (hole_basek + hole_sizek)<<10);
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state->reg = range_to_mtrr(state->reg, hole_basek,
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hole_sizek, MTRR_TYPE_UNCACHABLE, state->address_bits);
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}
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}
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static void __init set_var_mtrr_range(struct var_mtrr_state *state, unsigned long base_pfn, unsigned long size_pfn)
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{
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unsigned long basek, sizek;
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if (state->reg >= num_var_ranges)
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return;
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basek = base_pfn << (PAGE_SHIFT - 10);
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sizek = size_pfn << (PAGE_SHIFT - 10);
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/* See if I can merge with the last range */
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if ((basek <= 1024) || (state->range_startk + state->range_sizek == basek)) {
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unsigned long endk = basek + sizek;
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state->range_sizek = endk - state->range_startk;
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return;
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}
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/* Write the range mtrrs */
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if (state->range_sizek != 0) {
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range_to_mtrr_with_hole(state, basek);
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state->range_startk = 0;
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state->range_sizek = 0;
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}
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/* Allocate an msr */
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state->range_startk = basek;
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state->range_sizek = sizek;
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}
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/* mininum size of mtrr block that can take hole */
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static u64 mtrr_chunk_size __initdata = (256ULL<<20);
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static int __init parse_mtrr_chunk_size_opt(char *p)
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{
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if (!p)
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return -EINVAL;
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mtrr_chunk_size = memparse(p, &p);
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return 0;
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}
|
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early_param("mtrr_chunk_size", parse_mtrr_chunk_size_opt);
|
||||
|
||||
/* granity of mtrr of block */
|
||||
static u64 mtrr_gran_size __initdata = (64ULL<<20);
|
||||
|
||||
static int __init parse_mtrr_gran_size_opt(char *p)
|
||||
{
|
||||
if (!p)
|
||||
return -EINVAL;
|
||||
mtrr_gran_size = memparse(p, &p);
|
||||
return 0;
|
||||
}
|
||||
early_param("mtrr_gran_size", parse_mtrr_gran_size_opt);
|
||||
|
||||
static void __init x86_setup_var_mtrrs(struct res_range *range, int nr_range, unsigned address_bits)
|
||||
{
|
||||
struct var_mtrr_state var_state;
|
||||
int i;
|
||||
|
||||
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;
|
||||
|
||||
/* 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);
|
||||
|
||||
/* Write the last range */
|
||||
range_to_mtrr_with_hole(&var_state, 0);
|
||||
printk(KERN_INFO "DONE variable MTRRs\n");
|
||||
/* 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);
|
||||
}
|
||||
|
||||
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(range, nr_range, base, base + size - 1, 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);
|
||||
|
||||
/* 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);
|
||||
|
||||
/* 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);
|
||||
|
||||
return nr_range;
|
||||
}
|
||||
|
||||
static int __init mtrr_cleanup(unsigned address_bits)
|
||||
{
|
||||
unsigned long i, base, size, def, dummy;
|
||||
mtrr_type type;
|
||||
struct res_range range[RANGE_NUM];
|
||||
int nr_range;
|
||||
unsigned long extra_remove_base, extra_remove_size;
|
||||
|
||||
/* extra one for all 0 */
|
||||
int num[MTRR_NUM_TYPES + 1];
|
||||
|
||||
if (!is_cpu(INTEL) || enable_mtrr_cleanup < 1)
|
||||
return 0;
|
||||
rdmsr(MTRRdefType_MSR, def, dummy);
|
||||
def &= 0xff;
|
||||
if (def != MTRR_TYPE_UNCACHABLE)
|
||||
return 0;
|
||||
|
||||
/* check entries number */
|
||||
memset(num, 0, sizeof(num));
|
||||
for (i = 0; i < num_var_ranges; i++) {
|
||||
mtrr_if->get(i, &base, &size, &type);
|
||||
if (type >= MTRR_NUM_TYPES)
|
||||
continue;
|
||||
if (!size)
|
||||
type = MTRR_NUM_TYPES;
|
||||
num[type]++;
|
||||
}
|
||||
|
||||
/* check if we got UC entries */
|
||||
if (!num[MTRR_TYPE_UNCACHABLE])
|
||||
return 0;
|
||||
|
||||
/* check if we only had WB and UC */
|
||||
if (num[MTRR_TYPE_WRBACK] + num[MTRR_TYPE_UNCACHABLE] !=
|
||||
num_var_ranges - num[MTRR_NUM_TYPES])
|
||||
return 0;
|
||||
|
||||
memset(range, 0, sizeof(range));
|
||||
extra_remove_size = 0;
|
||||
if (mtrr_tom2) {
|
||||
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);
|
||||
|
||||
/* convert ranges to var ranges state */
|
||||
x86_setup_var_mtrrs(range, nr_range, address_bits);
|
||||
|
||||
return 1;
|
||||
|
||||
}
|
||||
|
||||
static int disable_mtrr_trim;
|
||||
|
||||
static int __init disable_mtrr_trim_setup(char *str)
|
||||
|
|
@ -729,18 +1176,21 @@ int __init mtrr_trim_uncached_memory(unsigned long end_pfn)
|
|||
*/
|
||||
void __init mtrr_bp_init(void)
|
||||
{
|
||||
u32 phys_addr;
|
||||
init_ifs();
|
||||
|
||||
phys_addr = 32;
|
||||
|
||||
if (cpu_has_mtrr) {
|
||||
mtrr_if = &generic_mtrr_ops;
|
||||
size_or_mask = 0xff000000; /* 36 bits */
|
||||
size_and_mask = 0x00f00000;
|
||||
phys_addr = 36;
|
||||
|
||||
/* This is an AMD specific MSR, but we assume(hope?) that
|
||||
Intel will implement it to when they extend the address
|
||||
bus of the Xeon. */
|
||||
if (cpuid_eax(0x80000000) >= 0x80000008) {
|
||||
u32 phys_addr;
|
||||
phys_addr = cpuid_eax(0x80000008) & 0xff;
|
||||
/* CPUID workaround for Intel 0F33/0F34 CPU */
|
||||
if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
|
||||
|
|
@ -758,6 +1208,7 @@ void __init mtrr_bp_init(void)
|
|||
don't support PAE */
|
||||
size_or_mask = 0xfff00000; /* 32 bits */
|
||||
size_and_mask = 0;
|
||||
phys_addr = 32;
|
||||
}
|
||||
} else {
|
||||
switch (boot_cpu_data.x86_vendor) {
|
||||
|
|
@ -791,8 +1242,13 @@ void __init mtrr_bp_init(void)
|
|||
if (mtrr_if) {
|
||||
set_num_var_ranges();
|
||||
init_table();
|
||||
if (use_intel())
|
||||
if (use_intel()) {
|
||||
get_mtrr_state();
|
||||
|
||||
if (mtrr_cleanup(phys_addr))
|
||||
mtrr_if->set_all();
|
||||
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -829,9 +1285,10 @@ static int __init mtrr_init_finialize(void)
|
|||
{
|
||||
if (!mtrr_if)
|
||||
return 0;
|
||||
if (use_intel())
|
||||
mtrr_state_warn();
|
||||
else {
|
||||
if (use_intel()) {
|
||||
if (enable_mtrr_cleanup < 1)
|
||||
mtrr_state_warn();
|
||||
} else {
|
||||
/* The CPUs haven't MTRR and seem to not support SMP. They have
|
||||
* specific drivers, we use a tricky method to support
|
||||
* suspend/resume for them.
|
||||
|
|
|
|||
|
|
@ -81,6 +81,8 @@ void set_mtrr_done(struct set_mtrr_context *ctxt);
|
|||
void set_mtrr_cache_disable(struct set_mtrr_context *ctxt);
|
||||
void set_mtrr_prepare_save(struct set_mtrr_context *ctxt);
|
||||
|
||||
void fill_mtrr_var_range(unsigned int index,
|
||||
u32 base_lo, u32 base_hi, u32 mask_lo, u32 mask_hi);
|
||||
void get_mtrr_state(void);
|
||||
|
||||
extern void set_mtrr_ops(struct mtrr_ops * ops);
|
||||
|
|
@ -92,6 +94,7 @@ extern struct mtrr_ops * mtrr_if;
|
|||
#define use_intel() (mtrr_if && mtrr_if->use_intel_if == 1)
|
||||
|
||||
extern unsigned int num_var_ranges;
|
||||
extern u64 mtrr_tom2;
|
||||
|
||||
void mtrr_state_warn(void);
|
||||
const char *mtrr_attrib_to_str(int x);
|
||||
|
|
|
|||
Loading…
Reference in a new issue