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authorYinghai Lu <yinghai@kernel.org>2009-03-11 23:07:39 -0400
committerIngo Molnar <mingo@elte.hu>2009-03-12 21:52:19 -0400
commit0d890355bff25e1dc03a577a90ed80741489ca54 (patch)
tree0cb740303fd6d94108e2e18086f77716fec32586 /arch/x86/kernel/cpu/mtrr/main.c
parentc1ab7e93c6ddf8a068719b97b7e26c3d8eba7c32 (diff)
x86: separate mtrr cleanup/mtrr_e820 trim to separate file
Impact: cleanup mtrr main.c is too big, seperate mtrr cleanup and mtrr e820 trim code to another file. Signed-off-by: Yinghai Lu <yinghai@kernel.org> LKML-Reference: <49B87C7B.80809@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/cpu/mtrr/main.c')
-rw-r--r--arch/x86/kernel/cpu/mtrr/main.c1055
1 files changed, 1 insertions, 1054 deletions
diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index 311a4734609b..5c2e266f41d7 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -610,1060 +610,7 @@ static struct sysdev_driver mtrr_sysdev_driver = {
610 .resume = mtrr_restore, 610 .resume = mtrr_restore,
611}; 611};
612 612
613/* should be related to MTRR_VAR_RANGES nums */ 613int __initdata changed_by_mtrr_cleanup;
614#define RANGE_NUM 256
615
616struct res_range {
617 unsigned long start;
618 unsigned long end;
619};
620
621static int __init
622add_range(struct res_range *range, int nr_range, unsigned long start,
623 unsigned long end)
624{
625 /* out of slots */
626 if (nr_range >= RANGE_NUM)
627 return nr_range;
628
629 range[nr_range].start = start;
630 range[nr_range].end = end;
631
632 nr_range++;
633
634 return nr_range;
635}
636
637static int __init
638add_range_with_merge(struct res_range *range, int nr_range, unsigned long start,
639 unsigned long end)
640{
641 int i;
642
643 /* try to merge it with old one */
644 for (i = 0; i < nr_range; i++) {
645 unsigned long final_start, final_end;
646 unsigned long common_start, common_end;
647
648 if (!range[i].end)
649 continue;
650
651 common_start = max(range[i].start, start);
652 common_end = min(range[i].end, end);
653 if (common_start > common_end + 1)
654 continue;
655
656 final_start = min(range[i].start, start);
657 final_end = max(range[i].end, end);
658
659 range[i].start = final_start;
660 range[i].end = final_end;
661 return nr_range;
662 }
663
664 /* need to add that */
665 return add_range(range, nr_range, start, end);
666}
667
668static void __init
669subtract_range(struct res_range *range, unsigned long start, unsigned long end)
670{
671 int i, j;
672
673 for (j = 0; j < RANGE_NUM; j++) {
674 if (!range[j].end)
675 continue;
676
677 if (start <= range[j].start && end >= range[j].end) {
678 range[j].start = 0;
679 range[j].end = 0;
680 continue;
681 }
682
683 if (start <= range[j].start && end < range[j].end &&
684 range[j].start < end + 1) {
685 range[j].start = end + 1;
686 continue;
687 }
688
689
690 if (start > range[j].start && end >= range[j].end &&
691 range[j].end > start - 1) {
692 range[j].end = start - 1;
693 continue;
694 }
695
696 if (start > range[j].start && end < range[j].end) {
697 /* find the new spare */
698 for (i = 0; i < RANGE_NUM; i++) {
699 if (range[i].end == 0)
700 break;
701 }
702 if (i < RANGE_NUM) {
703 range[i].end = range[j].end;
704 range[i].start = end + 1;
705 } else {
706 printk(KERN_ERR "run of slot in ranges\n");
707 }
708 range[j].end = start - 1;
709 continue;
710 }
711 }
712}
713
714static int __init cmp_range(const void *x1, const void *x2)
715{
716 const struct res_range *r1 = x1;
717 const struct res_range *r2 = x2;
718 long start1, start2;
719
720 start1 = r1->start;
721 start2 = r2->start;
722
723 return start1 - start2;
724}
725
726struct var_mtrr_range_state {
727 unsigned long base_pfn;
728 unsigned long size_pfn;
729 mtrr_type type;
730};
731
732static struct var_mtrr_range_state __initdata range_state[RANGE_NUM];
733static int __initdata debug_print;
734
735static int __init
736x86_get_mtrr_mem_range(struct res_range *range, int nr_range,
737 unsigned long extra_remove_base,
738 unsigned long extra_remove_size)
739{
740 unsigned long i, base, size;
741 mtrr_type type;
742
743 for (i = 0; i < num_var_ranges; i++) {
744 type = range_state[i].type;
745 if (type != MTRR_TYPE_WRBACK)
746 continue;
747 base = range_state[i].base_pfn;
748 size = range_state[i].size_pfn;
749 nr_range = add_range_with_merge(range, nr_range, base,
750 base + size - 1);
751 }
752 if (debug_print) {
753 printk(KERN_DEBUG "After WB checking\n");
754 for (i = 0; i < nr_range; i++)
755 printk(KERN_DEBUG "MTRR MAP PFN: %016lx - %016lx\n",
756 range[i].start, range[i].end + 1);
757 }
758
759 /* take out UC ranges */
760 for (i = 0; i < num_var_ranges; i++) {
761 type = range_state[i].type;
762 if (type != MTRR_TYPE_UNCACHABLE &&
763 type != MTRR_TYPE_WRPROT)
764 continue;
765 size = range_state[i].size_pfn;
766 if (!size)
767 continue;
768 base = range_state[i].base_pfn;
769 subtract_range(range, base, base + size - 1);
770 }
771 if (extra_remove_size)
772 subtract_range(range, extra_remove_base,
773 extra_remove_base + extra_remove_size - 1);
774
775 /* get new range num */
776 nr_range = 0;
777 for (i = 0; i < RANGE_NUM; i++) {
778 if (!range[i].end)
779 continue;
780 nr_range++;
781 }
782 if (debug_print) {
783 printk(KERN_DEBUG "After UC checking\n");
784 for (i = 0; i < nr_range; i++)
785 printk(KERN_DEBUG "MTRR MAP PFN: %016lx - %016lx\n",
786 range[i].start, range[i].end + 1);
787 }
788
789 /* sort the ranges */
790 sort(range, nr_range, sizeof(struct res_range), cmp_range, NULL);
791 if (debug_print) {
792 printk(KERN_DEBUG "After sorting\n");
793 for (i = 0; i < nr_range; i++)
794 printk(KERN_DEBUG "MTRR MAP PFN: %016lx - %016lx\n",
795 range[i].start, range[i].end + 1);
796 }
797
798 /* clear those is not used */
799 for (i = nr_range; i < RANGE_NUM; i++)
800 memset(&range[i], 0, sizeof(range[i]));
801
802 return nr_range;
803}
804
805static struct res_range __initdata range[RANGE_NUM];
806static int __initdata nr_range;
807
808#ifdef CONFIG_MTRR_SANITIZER
809
810static unsigned long __init sum_ranges(struct res_range *range, int nr_range)
811{
812 unsigned long sum;
813 int i;
814
815 sum = 0;
816 for (i = 0; i < nr_range; i++)
817 sum += range[i].end + 1 - range[i].start;
818
819 return sum;
820}
821
822static int enable_mtrr_cleanup __initdata =
823 CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT;
824
825static int __init disable_mtrr_cleanup_setup(char *str)
826{
827 enable_mtrr_cleanup = 0;
828 return 0;
829}
830early_param("disable_mtrr_cleanup", disable_mtrr_cleanup_setup);
831
832static int __init enable_mtrr_cleanup_setup(char *str)
833{
834 enable_mtrr_cleanup = 1;
835 return 0;
836}
837early_param("enable_mtrr_cleanup", enable_mtrr_cleanup_setup);
838
839static int __init mtrr_cleanup_debug_setup(char *str)
840{
841 debug_print = 1;
842 return 0;
843}
844early_param("mtrr_cleanup_debug", mtrr_cleanup_debug_setup);
845
846struct var_mtrr_state {
847 unsigned long range_startk;
848 unsigned long range_sizek;
849 unsigned long chunk_sizek;
850 unsigned long gran_sizek;
851 unsigned int reg;
852};
853
854static void __init
855set_var_mtrr(unsigned int reg, unsigned long basek, unsigned long sizek,
856 unsigned char type, unsigned int address_bits)
857{
858 u32 base_lo, base_hi, mask_lo, mask_hi;
859 u64 base, mask;
860
861 if (!sizek) {
862 fill_mtrr_var_range(reg, 0, 0, 0, 0);
863 return;
864 }
865
866 mask = (1ULL << address_bits) - 1;
867 mask &= ~((((u64)sizek) << 10) - 1);
868
869 base = ((u64)basek) << 10;
870
871 base |= type;
872 mask |= 0x800;
873
874 base_lo = base & ((1ULL<<32) - 1);
875 base_hi = base >> 32;
876
877 mask_lo = mask & ((1ULL<<32) - 1);
878 mask_hi = mask >> 32;
879
880 fill_mtrr_var_range(reg, base_lo, base_hi, mask_lo, mask_hi);
881}
882
883static void __init
884save_var_mtrr(unsigned int reg, unsigned long basek, unsigned long sizek,
885 unsigned char type)
886{
887 range_state[reg].base_pfn = basek >> (PAGE_SHIFT - 10);
888 range_state[reg].size_pfn = sizek >> (PAGE_SHIFT - 10);
889 range_state[reg].type = type;
890}
891
892static void __init
893set_var_mtrr_all(unsigned int address_bits)
894{
895 unsigned long basek, sizek;
896 unsigned char type;
897 unsigned int reg;
898
899 for (reg = 0; reg < num_var_ranges; reg++) {
900 basek = range_state[reg].base_pfn << (PAGE_SHIFT - 10);
901 sizek = range_state[reg].size_pfn << (PAGE_SHIFT - 10);
902 type = range_state[reg].type;
903
904 set_var_mtrr(reg, basek, sizek, type, address_bits);
905 }
906}
907
908static unsigned long to_size_factor(unsigned long sizek, char *factorp)
909{
910 char factor;
911 unsigned long base = sizek;
912
913 if (base & ((1<<10) - 1)) {
914 /* not MB alignment */
915 factor = 'K';
916 } else if (base & ((1<<20) - 1)){
917 factor = 'M';
918 base >>= 10;
919 } else {
920 factor = 'G';
921 base >>= 20;
922 }
923
924 *factorp = factor;
925
926 return base;
927}
928
929static unsigned int __init
930range_to_mtrr(unsigned int reg, unsigned long range_startk,
931 unsigned long range_sizek, unsigned char type)
932{
933 if (!range_sizek || (reg >= num_var_ranges))
934 return reg;
935
936 while (range_sizek) {
937 unsigned long max_align, align;
938 unsigned long sizek;
939
940 /* Compute the maximum size I can make a range */
941 if (range_startk)
942 max_align = ffs(range_startk) - 1;
943 else
944 max_align = 32;
945 align = fls(range_sizek) - 1;
946 if (align > max_align)
947 align = max_align;
948
949 sizek = 1 << align;
950 if (debug_print) {
951 char start_factor = 'K', size_factor = 'K';
952 unsigned long start_base, size_base;
953
954 start_base = to_size_factor(range_startk, &start_factor),
955 size_base = to_size_factor(sizek, &size_factor),
956
957 printk(KERN_DEBUG "Setting variable MTRR %d, "
958 "base: %ld%cB, range: %ld%cB, type %s\n",
959 reg, start_base, start_factor,
960 size_base, size_factor,
961 (type == MTRR_TYPE_UNCACHABLE)?"UC":
962 ((type == MTRR_TYPE_WRBACK)?"WB":"Other")
963 );
964 }
965 save_var_mtrr(reg++, range_startk, sizek, type);
966 range_startk += sizek;
967 range_sizek -= sizek;
968 if (reg >= num_var_ranges)
969 break;
970 }
971 return reg;
972}
973
974static unsigned __init
975range_to_mtrr_with_hole(struct var_mtrr_state *state, unsigned long basek,
976 unsigned long sizek)
977{
978 unsigned long hole_basek, hole_sizek;
979 unsigned long second_basek, second_sizek;
980 unsigned long range0_basek, range0_sizek;
981 unsigned long range_basek, range_sizek;
982 unsigned long chunk_sizek;
983 unsigned long gran_sizek;
984
985 hole_basek = 0;
986 hole_sizek = 0;
987 second_basek = 0;
988 second_sizek = 0;
989 chunk_sizek = state->chunk_sizek;
990 gran_sizek = state->gran_sizek;
991
992 /* align with gran size, prevent small block used up MTRRs */
993 range_basek = ALIGN(state->range_startk, gran_sizek);
994 if ((range_basek > basek) && basek)
995 return second_sizek;
996 state->range_sizek -= (range_basek - state->range_startk);
997 range_sizek = ALIGN(state->range_sizek, gran_sizek);
998
999 while (range_sizek > state->range_sizek) {
1000 range_sizek -= gran_sizek;
1001 if (!range_sizek)
1002 return 0;
1003 }
1004 state->range_sizek = range_sizek;
1005
1006 /* try to append some small hole */
1007 range0_basek = state->range_startk;
1008 range0_sizek = ALIGN(state->range_sizek, chunk_sizek);
1009
1010 /* no increase */
1011 if (range0_sizek == state->range_sizek) {
1012 if (debug_print)
1013 printk(KERN_DEBUG "rangeX: %016lx - %016lx\n",
1014 range0_basek<<10,
1015 (range0_basek + state->range_sizek)<<10);
1016 state->reg = range_to_mtrr(state->reg, range0_basek,
1017 state->range_sizek, MTRR_TYPE_WRBACK);
1018 return 0;
1019 }
1020
1021 /* only cut back, when it is not the last */
1022 if (sizek) {
1023 while (range0_basek + range0_sizek > (basek + sizek)) {
1024 if (range0_sizek >= chunk_sizek)
1025 range0_sizek -= chunk_sizek;
1026 else
1027 range0_sizek = 0;
1028
1029 if (!range0_sizek)
1030 break;
1031 }
1032 }
1033
1034second_try:
1035 range_basek = range0_basek + range0_sizek;
1036
1037 /* one hole in the middle */
1038 if (range_basek > basek && range_basek <= (basek + sizek))
1039 second_sizek = range_basek - basek;
1040
1041 if (range0_sizek > state->range_sizek) {
1042
1043 /* one hole in middle or at end */
1044 hole_sizek = range0_sizek - state->range_sizek - second_sizek;
1045
1046 /* hole size should be less than half of range0 size */
1047 if (hole_sizek >= (range0_sizek >> 1) &&
1048 range0_sizek >= chunk_sizek) {
1049 range0_sizek -= chunk_sizek;
1050 second_sizek = 0;
1051 hole_sizek = 0;
1052
1053 goto second_try;
1054 }
1055 }
1056
1057 if (range0_sizek) {
1058 if (debug_print)
1059 printk(KERN_DEBUG "range0: %016lx - %016lx\n",
1060 range0_basek<<10,
1061 (range0_basek + range0_sizek)<<10);
1062 state->reg = range_to_mtrr(state->reg, range0_basek,
1063 range0_sizek, MTRR_TYPE_WRBACK);
1064 }
1065
1066 if (range0_sizek < state->range_sizek) {
1067 /* need to handle left over */
1068 range_sizek = state->range_sizek - range0_sizek;
1069
1070 if (debug_print)
1071 printk(KERN_DEBUG "range: %016lx - %016lx\n",
1072 range_basek<<10,
1073 (range_basek + range_sizek)<<10);
1074 state->reg = range_to_mtrr(state->reg, range_basek,
1075 range_sizek, MTRR_TYPE_WRBACK);
1076 }
1077
1078 if (hole_sizek) {
1079 hole_basek = range_basek - hole_sizek - second_sizek;
1080 if (debug_print)
1081 printk(KERN_DEBUG "hole: %016lx - %016lx\n",
1082 hole_basek<<10,
1083 (hole_basek + hole_sizek)<<10);
1084 state->reg = range_to_mtrr(state->reg, hole_basek,
1085 hole_sizek, MTRR_TYPE_UNCACHABLE);
1086 }
1087
1088 return second_sizek;
1089}
1090
1091static void __init
1092set_var_mtrr_range(struct var_mtrr_state *state, unsigned long base_pfn,
1093 unsigned long size_pfn)
1094{
1095 unsigned long basek, sizek;
1096 unsigned long second_sizek = 0;
1097
1098 if (state->reg >= num_var_ranges)
1099 return;
1100
1101 basek = base_pfn << (PAGE_SHIFT - 10);
1102 sizek = size_pfn << (PAGE_SHIFT - 10);
1103
1104 /* See if I can merge with the last range */
1105 if ((basek <= 1024) ||
1106 (state->range_startk + state->range_sizek == basek)) {
1107 unsigned long endk = basek + sizek;
1108 state->range_sizek = endk - state->range_startk;
1109 return;
1110 }
1111 /* Write the range mtrrs */
1112 if (state->range_sizek != 0)
1113 second_sizek = range_to_mtrr_with_hole(state, basek, sizek);
1114
1115 /* Allocate an msr */
1116 state->range_startk = basek + second_sizek;
1117 state->range_sizek = sizek - second_sizek;
1118}
1119
1120/* mininum size of mtrr block that can take hole */
1121static u64 mtrr_chunk_size __initdata = (256ULL<<20);
1122
1123static int __init parse_mtrr_chunk_size_opt(char *p)
1124{
1125 if (!p)
1126 return -EINVAL;
1127 mtrr_chunk_size = memparse(p, &p);
1128 return 0;
1129}
1130early_param("mtrr_chunk_size", parse_mtrr_chunk_size_opt);
1131
1132/* granity of mtrr of block */
1133static u64 mtrr_gran_size __initdata;
1134
1135static int __init parse_mtrr_gran_size_opt(char *p)
1136{
1137 if (!p)
1138 return -EINVAL;
1139 mtrr_gran_size = memparse(p, &p);
1140 return 0;
1141}
1142early_param("mtrr_gran_size", parse_mtrr_gran_size_opt);
1143
1144static int nr_mtrr_spare_reg __initdata =
1145 CONFIG_MTRR_SANITIZER_SPARE_REG_NR_DEFAULT;
1146
1147static int __init parse_mtrr_spare_reg(char *arg)
1148{
1149 if (arg)
1150 nr_mtrr_spare_reg = simple_strtoul(arg, NULL, 0);
1151 return 0;
1152}
1153
1154early_param("mtrr_spare_reg_nr", parse_mtrr_spare_reg);
1155
1156static int __init
1157x86_setup_var_mtrrs(struct res_range *range, int nr_range,
1158 u64 chunk_size, u64 gran_size)
1159{
1160 struct var_mtrr_state var_state;
1161 int i;
1162 int num_reg;
1163
1164 var_state.range_startk = 0;
1165 var_state.range_sizek = 0;
1166 var_state.reg = 0;
1167 var_state.chunk_sizek = chunk_size >> 10;
1168 var_state.gran_sizek = gran_size >> 10;
1169
1170 memset(range_state, 0, sizeof(range_state));
1171
1172 /* Write the range etc */
1173 for (i = 0; i < nr_range; i++)
1174 set_var_mtrr_range(&var_state, range[i].start,
1175 range[i].end - range[i].start + 1);
1176
1177 /* Write the last range */
1178 if (var_state.range_sizek != 0)
1179 range_to_mtrr_with_hole(&var_state, 0, 0);
1180
1181 num_reg = var_state.reg;
1182 /* Clear out the extra MTRR's */
1183 while (var_state.reg < num_var_ranges) {
1184 save_var_mtrr(var_state.reg, 0, 0, 0);
1185 var_state.reg++;
1186 }
1187
1188 return num_reg;
1189}
1190
1191struct mtrr_cleanup_result {
1192 unsigned long gran_sizek;
1193 unsigned long chunk_sizek;
1194 unsigned long lose_cover_sizek;
1195 unsigned int num_reg;
1196 int bad;
1197};
1198
1199/*
1200 * gran_size: 64K, 128K, 256K, 512K, 1M, 2M, ..., 2G
1201 * chunk size: gran_size, ..., 2G
1202 * so we need (1+16)*8
1203 */
1204#define NUM_RESULT 136
1205#define PSHIFT (PAGE_SHIFT - 10)
1206
1207static struct mtrr_cleanup_result __initdata result[NUM_RESULT];
1208static unsigned long __initdata min_loss_pfn[RANGE_NUM];
1209
1210static void __init print_out_mtrr_range_state(void)
1211{
1212 int i;
1213 char start_factor = 'K', size_factor = 'K';
1214 unsigned long start_base, size_base;
1215 mtrr_type type;
1216
1217 for (i = 0; i < num_var_ranges; i++) {
1218
1219 size_base = range_state[i].size_pfn << (PAGE_SHIFT - 10);
1220 if (!size_base)
1221 continue;
1222
1223 size_base = to_size_factor(size_base, &size_factor),
1224 start_base = range_state[i].base_pfn << (PAGE_SHIFT - 10);
1225 start_base = to_size_factor(start_base, &start_factor),
1226 type = range_state[i].type;
1227
1228 printk(KERN_DEBUG "reg %d, base: %ld%cB, range: %ld%cB, type %s\n",
1229 i, start_base, start_factor,
1230 size_base, size_factor,
1231 (type == MTRR_TYPE_UNCACHABLE) ? "UC" :
1232 ((type == MTRR_TYPE_WRPROT) ? "WP" :
1233 ((type == MTRR_TYPE_WRBACK) ? "WB" : "Other"))
1234 );
1235 }
1236}
1237
1238static int __init mtrr_need_cleanup(void)
1239{
1240 int i;
1241 mtrr_type type;
1242 unsigned long size;
1243 /* extra one for all 0 */
1244 int num[MTRR_NUM_TYPES + 1];
1245
1246 /* check entries number */
1247 memset(num, 0, sizeof(num));
1248 for (i = 0; i < num_var_ranges; i++) {
1249 type = range_state[i].type;
1250 size = range_state[i].size_pfn;
1251 if (type >= MTRR_NUM_TYPES)
1252 continue;
1253 if (!size)
1254 type = MTRR_NUM_TYPES;
1255 if (type == MTRR_TYPE_WRPROT)
1256 type = MTRR_TYPE_UNCACHABLE;
1257 num[type]++;
1258 }
1259
1260 /* check if we got UC entries */
1261 if (!num[MTRR_TYPE_UNCACHABLE])
1262 return 0;
1263
1264 /* check if we only had WB and UC */
1265 if (num[MTRR_TYPE_WRBACK] + num[MTRR_TYPE_UNCACHABLE] !=
1266 num_var_ranges - num[MTRR_NUM_TYPES])
1267 return 0;
1268
1269 return 1;
1270}
1271
1272static unsigned long __initdata range_sums;
1273static void __init mtrr_calc_range_state(u64 chunk_size, u64 gran_size,
1274 unsigned long extra_remove_base,
1275 unsigned long extra_remove_size,
1276 int i)
1277{
1278 int num_reg;
1279 static struct res_range range_new[RANGE_NUM];
1280 static int nr_range_new;
1281 unsigned long range_sums_new;
1282
1283 /* convert ranges to var ranges state */
1284 num_reg = x86_setup_var_mtrrs(range, nr_range,
1285 chunk_size, gran_size);
1286
1287 /* we got new setting in range_state, check it */
1288 memset(range_new, 0, sizeof(range_new));
1289 nr_range_new = x86_get_mtrr_mem_range(range_new, 0,
1290 extra_remove_base, extra_remove_size);
1291 range_sums_new = sum_ranges(range_new, nr_range_new);
1292
1293 result[i].chunk_sizek = chunk_size >> 10;
1294 result[i].gran_sizek = gran_size >> 10;
1295 result[i].num_reg = num_reg;
1296 if (range_sums < range_sums_new) {
1297 result[i].lose_cover_sizek =
1298 (range_sums_new - range_sums) << PSHIFT;
1299 result[i].bad = 1;
1300 } else
1301 result[i].lose_cover_sizek =
1302 (range_sums - range_sums_new) << PSHIFT;
1303
1304 /* double check it */
1305 if (!result[i].bad && !result[i].lose_cover_sizek) {
1306 if (nr_range_new != nr_range ||
1307 memcmp(range, range_new, sizeof(range)))
1308 result[i].bad = 1;
1309 }
1310
1311 if (!result[i].bad && (range_sums - range_sums_new <
1312 min_loss_pfn[num_reg])) {
1313 min_loss_pfn[num_reg] =
1314 range_sums - range_sums_new;
1315 }
1316}
1317
1318static void __init mtrr_print_out_one_result(int i)
1319{
1320 char gran_factor, chunk_factor, lose_factor;
1321 unsigned long gran_base, chunk_base, lose_base;
1322
1323 gran_base = to_size_factor(result[i].gran_sizek, &gran_factor),
1324 chunk_base = to_size_factor(result[i].chunk_sizek, &chunk_factor),
1325 lose_base = to_size_factor(result[i].lose_cover_sizek, &lose_factor),
1326 printk(KERN_INFO "%sgran_size: %ld%c \tchunk_size: %ld%c \t",
1327 result[i].bad ? "*BAD*" : " ",
1328 gran_base, gran_factor, chunk_base, chunk_factor);
1329 printk(KERN_CONT "num_reg: %d \tlose cover RAM: %s%ld%c\n",
1330 result[i].num_reg, result[i].bad ? "-" : "",
1331 lose_base, lose_factor);
1332}
1333
1334static int __init mtrr_search_optimal_index(void)
1335{
1336 int i;
1337 int num_reg_good;
1338 int index_good;
1339
1340 if (nr_mtrr_spare_reg >= num_var_ranges)
1341 nr_mtrr_spare_reg = num_var_ranges - 1;
1342 num_reg_good = -1;
1343 for (i = num_var_ranges - nr_mtrr_spare_reg; i > 0; i--) {
1344 if (!min_loss_pfn[i])
1345 num_reg_good = i;
1346 }
1347
1348 index_good = -1;
1349 if (num_reg_good != -1) {
1350 for (i = 0; i < NUM_RESULT; i++) {
1351 if (!result[i].bad &&
1352 result[i].num_reg == num_reg_good &&
1353 !result[i].lose_cover_sizek) {
1354 index_good = i;
1355 break;
1356 }
1357 }
1358 }
1359
1360 return index_good;
1361}
1362
1363
1364static int __init mtrr_cleanup(unsigned address_bits)
1365{
1366 unsigned long extra_remove_base, extra_remove_size;
1367 unsigned long base, size, def, dummy;
1368 mtrr_type type;
1369 u64 chunk_size, gran_size;
1370 int index_good;
1371 int i;
1372
1373 if (!is_cpu(INTEL) || enable_mtrr_cleanup < 1)
1374 return 0;
1375 rdmsr(MTRRdefType_MSR, def, dummy);
1376 def &= 0xff;
1377 if (def != MTRR_TYPE_UNCACHABLE)
1378 return 0;
1379
1380 /* get it and store it aside */
1381 memset(range_state, 0, sizeof(range_state));
1382 for (i = 0; i < num_var_ranges; i++) {
1383 mtrr_if->get(i, &base, &size, &type);
1384 range_state[i].base_pfn = base;
1385 range_state[i].size_pfn = size;
1386 range_state[i].type = type;
1387 }
1388
1389 /* check if we need handle it and can handle it */
1390 if (!mtrr_need_cleanup())
1391 return 0;
1392
1393 /* print original var MTRRs at first, for debugging: */
1394 printk(KERN_DEBUG "original variable MTRRs\n");
1395 print_out_mtrr_range_state();
1396
1397 memset(range, 0, sizeof(range));
1398 extra_remove_size = 0;
1399 extra_remove_base = 1 << (32 - PAGE_SHIFT);
1400 if (mtrr_tom2)
1401 extra_remove_size =
1402 (mtrr_tom2 >> PAGE_SHIFT) - extra_remove_base;
1403 nr_range = x86_get_mtrr_mem_range(range, 0, extra_remove_base,
1404 extra_remove_size);
1405 /*
1406 * [0, 1M) should always be coverred by var mtrr with WB
1407 * and fixed mtrrs should take effective before var mtrr for it
1408 */
1409 nr_range = add_range_with_merge(range, nr_range, 0,
1410 (1ULL<<(20 - PAGE_SHIFT)) - 1);
1411 /* sort the ranges */
1412 sort(range, nr_range, sizeof(struct res_range), cmp_range, NULL);
1413
1414 range_sums = sum_ranges(range, nr_range);
1415 printk(KERN_INFO "total RAM coverred: %ldM\n",
1416 range_sums >> (20 - PAGE_SHIFT));
1417
1418 if (mtrr_chunk_size && mtrr_gran_size) {
1419 i = 0;
1420 mtrr_calc_range_state(mtrr_chunk_size, mtrr_gran_size,
1421 extra_remove_base, extra_remove_size, i);
1422
1423 mtrr_print_out_one_result(i);
1424
1425 if (!result[i].bad) {
1426 set_var_mtrr_all(address_bits);
1427 printk(KERN_DEBUG "New variable MTRRs\n");
1428 print_out_mtrr_range_state();
1429 return 1;
1430 }
1431 printk(KERN_INFO "invalid mtrr_gran_size or mtrr_chunk_size, "
1432 "will find optimal one\n");
1433 }
1434
1435 i = 0;
1436 memset(min_loss_pfn, 0xff, sizeof(min_loss_pfn));
1437 memset(result, 0, sizeof(result));
1438 for (gran_size = (1ULL<<16); gran_size < (1ULL<<32); gran_size <<= 1) {
1439
1440 for (chunk_size = gran_size; chunk_size < (1ULL<<32);
1441 chunk_size <<= 1) {
1442
1443 if (i >= NUM_RESULT)
1444 continue;
1445
1446 mtrr_calc_range_state(chunk_size, gran_size,
1447 extra_remove_base, extra_remove_size, i);
1448 if (debug_print) {
1449 mtrr_print_out_one_result(i);
1450 printk(KERN_INFO "\n");
1451 }
1452
1453 i++;
1454 }
1455 }
1456
1457 /* try to find the optimal index */
1458 index_good = mtrr_search_optimal_index();
1459
1460 if (index_good != -1) {
1461 printk(KERN_INFO "Found optimal setting for mtrr clean up\n");
1462 i = index_good;
1463 mtrr_print_out_one_result(i);
1464
1465 /* convert ranges to var ranges state */
1466 chunk_size = result[i].chunk_sizek;
1467 chunk_size <<= 10;
1468 gran_size = result[i].gran_sizek;
1469 gran_size <<= 10;
1470 x86_setup_var_mtrrs(range, nr_range, chunk_size, gran_size);
1471 set_var_mtrr_all(address_bits);
1472 printk(KERN_DEBUG "New variable MTRRs\n");
1473 print_out_mtrr_range_state();
1474 return 1;
1475 } else {
1476 /* print out all */
1477 for (i = 0; i < NUM_RESULT; i++)
1478 mtrr_print_out_one_result(i);
1479 }
1480
1481 printk(KERN_INFO "mtrr_cleanup: can not find optimal value\n");
1482 printk(KERN_INFO "please specify mtrr_gran_size/mtrr_chunk_size\n");
1483
1484 return 0;
1485}
1486#else
1487static int __init mtrr_cleanup(unsigned address_bits)
1488{
1489 return 0;
1490}
1491#endif
1492
1493static int __initdata changed_by_mtrr_cleanup;
1494
1495static int disable_mtrr_trim;
1496
1497static int __init disable_mtrr_trim_setup(char *str)
1498{
1499 disable_mtrr_trim = 1;
1500 return 0;
1501}
1502early_param("disable_mtrr_trim", disable_mtrr_trim_setup);
1503
1504/*
1505 * Newer AMD K8s and later CPUs have a special magic MSR way to force WB
1506 * for memory >4GB. Check for that here.
1507 * Note this won't check if the MTRRs < 4GB where the magic bit doesn't
1508 * apply to are wrong, but so far we don't know of any such case in the wild.
1509 */
1510#define Tom2Enabled (1U << 21)
1511#define Tom2ForceMemTypeWB (1U << 22)
1512
1513int __init amd_special_default_mtrr(void)
1514{
1515 u32 l, h;
1516
1517 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
1518 return 0;
1519 if (boot_cpu_data.x86 < 0xf || boot_cpu_data.x86 > 0x11)
1520 return 0;
1521 /* In case some hypervisor doesn't pass SYSCFG through */
1522 if (rdmsr_safe(MSR_K8_SYSCFG, &l, &h) < 0)
1523 return 0;
1524 /*
1525 * Memory between 4GB and top of mem is forced WB by this magic bit.
1526 * Reserved before K8RevF, but should be zero there.
1527 */
1528 if ((l & (Tom2Enabled | Tom2ForceMemTypeWB)) ==
1529 (Tom2Enabled | Tom2ForceMemTypeWB))
1530 return 1;
1531 return 0;
1532}
1533
1534static u64 __init real_trim_memory(unsigned long start_pfn,
1535 unsigned long limit_pfn)
1536{
1537 u64 trim_start, trim_size;
1538 trim_start = start_pfn;
1539 trim_start <<= PAGE_SHIFT;
1540 trim_size = limit_pfn;
1541 trim_size <<= PAGE_SHIFT;
1542 trim_size -= trim_start;
1543
1544 return e820_update_range(trim_start, trim_size, E820_RAM,
1545 E820_RESERVED);
1546}
1547/**
1548 * mtrr_trim_uncached_memory - trim RAM not covered by MTRRs
1549 * @end_pfn: ending page frame number
1550 *
1551 * Some buggy BIOSes don't setup the MTRRs properly for systems with certain
1552 * memory configurations. This routine checks that the highest MTRR matches
1553 * the end of memory, to make sure the MTRRs having a write back type cover
1554 * all of the memory the kernel is intending to use. If not, it'll trim any
1555 * memory off the end by adjusting end_pfn, removing it from the kernel's
1556 * allocation pools, warning the user with an obnoxious message.
1557 */
1558int __init mtrr_trim_uncached_memory(unsigned long end_pfn)
1559{
1560 unsigned long i, base, size, highest_pfn = 0, def, dummy;
1561 mtrr_type type;
1562 u64 total_trim_size;
1563
1564 /* extra one for all 0 */
1565 int num[MTRR_NUM_TYPES + 1];
1566 /*
1567 * Make sure we only trim uncachable memory on machines that
1568 * support the Intel MTRR architecture:
1569 */
1570 if (!is_cpu(INTEL) || disable_mtrr_trim)
1571 return 0;
1572 rdmsr(MTRRdefType_MSR, def, dummy);
1573 def &= 0xff;
1574 if (def != MTRR_TYPE_UNCACHABLE)
1575 return 0;
1576
1577 /* get it and store it aside */
1578 memset(range_state, 0, sizeof(range_state));
1579 for (i = 0; i < num_var_ranges; i++) {
1580 mtrr_if->get(i, &base, &size, &type);
1581 range_state[i].base_pfn = base;
1582 range_state[i].size_pfn = size;
1583 range_state[i].type = type;
1584 }
1585
1586 /* Find highest cached pfn */
1587 for (i = 0; i < num_var_ranges; i++) {
1588 type = range_state[i].type;
1589 if (type != MTRR_TYPE_WRBACK)
1590 continue;
1591 base = range_state[i].base_pfn;
1592 size = range_state[i].size_pfn;
1593 if (highest_pfn < base + size)
1594 highest_pfn = base + size;
1595 }
1596
1597 /* kvm/qemu doesn't have mtrr set right, don't trim them all */
1598 if (!highest_pfn) {
1599 printk(KERN_INFO "CPU MTRRs all blank - virtualized system.\n");
1600 return 0;
1601 }
1602
1603 /* check entries number */
1604 memset(num, 0, sizeof(num));
1605 for (i = 0; i < num_var_ranges; i++) {
1606 type = range_state[i].type;
1607 if (type >= MTRR_NUM_TYPES)
1608 continue;
1609 size = range_state[i].size_pfn;
1610 if (!size)
1611 type = MTRR_NUM_TYPES;
1612 num[type]++;
1613 }
1614
1615 /* no entry for WB? */
1616 if (!num[MTRR_TYPE_WRBACK])
1617 return 0;
1618
1619 /* check if we only had WB and UC */
1620 if (num[MTRR_TYPE_WRBACK] + num[MTRR_TYPE_UNCACHABLE] !=
1621 num_var_ranges - num[MTRR_NUM_TYPES])
1622 return 0;
1623
1624 memset(range, 0, sizeof(range));
1625 nr_range = 0;
1626 if (mtrr_tom2) {
1627 range[nr_range].start = (1ULL<<(32 - PAGE_SHIFT));
1628 range[nr_range].end = (mtrr_tom2 >> PAGE_SHIFT) - 1;
1629 if (highest_pfn < range[nr_range].end + 1)
1630 highest_pfn = range[nr_range].end + 1;
1631 nr_range++;
1632 }
1633 nr_range = x86_get_mtrr_mem_range(range, nr_range, 0, 0);
1634
1635 total_trim_size = 0;
1636 /* check the head */
1637 if (range[0].start)
1638 total_trim_size += real_trim_memory(0, range[0].start);
1639 /* check the holes */
1640 for (i = 0; i < nr_range - 1; i++) {
1641 if (range[i].end + 1 < range[i+1].start)
1642 total_trim_size += real_trim_memory(range[i].end + 1,
1643 range[i+1].start);
1644 }
1645 /* check the top */
1646 i = nr_range - 1;
1647 if (range[i].end + 1 < end_pfn)
1648 total_trim_size += real_trim_memory(range[i].end + 1,
1649 end_pfn);
1650
1651 if (total_trim_size) {
1652 printk(KERN_WARNING "WARNING: BIOS bug: CPU MTRRs don't cover"
1653 " all of memory, losing %lluMB of RAM.\n",
1654 total_trim_size >> 20);
1655
1656 if (!changed_by_mtrr_cleanup)
1657 WARN_ON(1);
1658
1659 printk(KERN_INFO "update e820 for mtrr\n");
1660 update_e820();
1661
1662 return 1;
1663 }
1664
1665 return 0;
1666}
1667 614
1668/** 615/**
1669 * mtrr_bp_init - initialize mtrrs on the boot CPU 616 * mtrr_bp_init - initialize mtrrs on the boot CPU
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