target/s390x/cpu_features.c

   1 /*
   2  * CPU features/facilities for s390x
   3  *
   4  * Copyright IBM Corp. 2016, 2018
   5  * Copyright Red Hat, Inc. 2019
   6  *
   7  * Author(s): David Hildenbrand <david@redhat.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or (at
  10  * your option) any later version. See the COPYING file in the top-level
  11  * directory.
  12  */
  13
  14 #include "qemu/osdep.h"
  15 #include "qemu/module.h"
  16 #include "cpu_features.h"
  17
  18 #define DEF_FEAT(_FEAT, _NAME, _TYPE, _BIT, _DESC) \
  19     [S390_FEAT_##_FEAT] = {                        \
  20         .name = _NAME,                             \
  21         .type = S390_FEAT_TYPE_##_TYPE,            \
  22         .bit = _BIT,                               \
  23         .desc = _DESC,                             \
  24     },
  25 static const S390FeatDef s390_features[S390_FEAT_MAX] = {
  26     #include "cpu_features_def.inc.h"
  27 };
  28 #undef DEF_FEAT
  29
  30 const S390FeatDef *s390_feat_def(S390Feat feat)
  31 {
  32     return &s390_features[feat];
  33 }
  34
  35 S390Feat s390_feat_by_type_and_bit(S390FeatType type, int bit)
  36 {
  37     S390Feat feat;
  38
  39     for (feat = 0; feat < ARRAY_SIZE(s390_features); feat++) {
  40         if (s390_features[feat].type == type &&
  41             s390_features[feat].bit == bit) {
  42             return feat;
  43         }
  44     }
  45     return S390_FEAT_MAX;
  46 }
  47
  48 void s390_init_feat_bitmap(const S390FeatInit init, S390FeatBitmap bitmap)
  49 {
  50     int i, j;
  51
  52     for (i = 0; i < (S390_FEAT_MAX / 64 + 1); i++) {
  53         if (init[i]) {
  54             for (j = 0; j < 64; j++) {
  55                 if (init[i] & 1ULL << j) {
  56                     set_bit(i * 64 + j, bitmap);
  57                 }
  58             }
  59         }
  60     }
  61 }
  62
  63 void s390_fill_feat_block(const S390FeatBitmap features, S390FeatType type,
  64                           uint8_t *data)
  65 {
  66     S390Feat feat;
  67     int bit_nr;
  68
  69     switch (type) {
  70     case S390_FEAT_TYPE_STFL:
  71         if (test_bit(S390_FEAT_ZARCH, features)) {
  72             /* Features that are always active */
  73             set_be_bit(2, data);   /* z/Architecture */
  74             set_be_bit(138, data); /* Configuration-z-architectural-mode */
  75         }
  76         break;
  77     case S390_FEAT_TYPE_PTFF:
  78     case S390_FEAT_TYPE_KMAC:
  79     case S390_FEAT_TYPE_KMC:
  80     case S390_FEAT_TYPE_KM:
  81     case S390_FEAT_TYPE_KIMD:
  82     case S390_FEAT_TYPE_KLMD:
  83     case S390_FEAT_TYPE_PCKMO:
  84     case S390_FEAT_TYPE_KMCTR:
  85     case S390_FEAT_TYPE_KMF:
  86     case S390_FEAT_TYPE_KMO:
  87     case S390_FEAT_TYPE_PCC:
  88     case S390_FEAT_TYPE_PPNO:
  89     case S390_FEAT_TYPE_KMA:
  90     case S390_FEAT_TYPE_KDSA:
  91     case S390_FEAT_TYPE_SORTL:
  92     case S390_FEAT_TYPE_DFLTCC:
  93         set_be_bit(0, data); /* query is always available */
  94         break;
  95     default:
  96         break;
  97     };
  98
  99     feat = find_first_bit(features, S390_FEAT_MAX);
 100     while (feat < S390_FEAT_MAX) {
 101         if (s390_features[feat].type == type) {
 102             bit_nr = s390_features[feat].bit;
 103             /* big endian on uint8_t array */
 104             set_be_bit(bit_nr, data);
 105         }
 106         feat = find_next_bit(features, S390_FEAT_MAX, feat + 1);
 107     }
 108 }
 109
 110 void s390_add_from_feat_block(S390FeatBitmap features, S390FeatType type,
 111                               uint8_t *data)
 112 {
 113     int nr_bits, le_bit;
 114
 115     switch (type) {
 116     case S390_FEAT_TYPE_STFL:
 117        nr_bits = 16384;
 118        break;
 119     case S390_FEAT_TYPE_PLO:
 120     case S390_FEAT_TYPE_SORTL:
 121     case S390_FEAT_TYPE_DFLTCC:
 122        nr_bits = 256;
 123        break;
 124     default:
 125        /* all cpu subfunctions have 128 bit */
 126        nr_bits = 128;
 127     };
 128
 129     le_bit = find_first_bit((unsigned long *) data, nr_bits);
 130     while (le_bit < nr_bits) {
 131         /* convert the bit number to a big endian bit nr */
 132         S390Feat feat = s390_feat_by_type_and_bit(type, BE_BIT_NR(le_bit));
 133         /* ignore unknown bits */
 134         if (feat < S390_FEAT_MAX) {
 135             set_bit(feat, features);
 136         }
 137         le_bit = find_next_bit((unsigned long *) data, nr_bits, le_bit + 1);
 138     }
 139 }
 140
 141 void s390_feat_bitmap_to_ascii(const S390FeatBitmap features, void *opaque,
 142                                void (*fn)(const char *name, void *opaque))
 143 {
 144     S390FeatBitmap bitmap, tmp;
 145     S390FeatGroup group;
 146     S390Feat feat;
 147
 148     bitmap_copy(bitmap, features, S390_FEAT_MAX);
 149
 150     /* process whole groups first */
 151     for (group = 0; group < S390_FEAT_GROUP_MAX; group++) {
 152         const S390FeatGroupDef *def = s390_feat_group_def(group);
 153
 154         bitmap_and(tmp, bitmap, def->feat, S390_FEAT_MAX);
 155         if (bitmap_equal(tmp, def->feat, S390_FEAT_MAX)) {
 156             bitmap_andnot(bitmap, bitmap, def->feat, S390_FEAT_MAX);
 157             fn(def->name, opaque);
 158         }
 159     }
 160
 161     /* report leftovers as separate features */
 162     feat = find_first_bit(bitmap, S390_FEAT_MAX);
 163     while (feat < S390_FEAT_MAX) {
 164         fn(s390_feat_def(feat)->name, opaque);
 165         feat = find_next_bit(bitmap, S390_FEAT_MAX, feat + 1);
 166     };
 167 }
 168
 169 #define FEAT_GROUP_INIT(_name, _group, _desc)        \
 170     {                                                \
 171         .name = _name,                               \
 172         .desc = _desc,                               \
 173         .init = { S390_FEAT_GROUP_LIST_ ## _group }, \
 174     }
 175
 176 /* indexed by feature group number for easy lookup */
 177 static S390FeatGroupDef s390_feature_groups[] = {
 178     FEAT_GROUP_INIT("plo", PLO, "Perform-locked-operation facility"),
 179     FEAT_GROUP_INIT("tods", TOD_CLOCK_STEERING, "Tod-clock-steering facility"),
 180     FEAT_GROUP_INIT("gen13ptff", GEN13_PTFF, "PTFF enhancements introduced with z13"),
 181     FEAT_GROUP_INIT("msa", MSA, "Message-security-assist facility"),
 182     FEAT_GROUP_INIT("msa1", MSA_EXT_1, "Message-security-assist-extension 1 facility"),
 183     FEAT_GROUP_INIT("msa2", MSA_EXT_2, "Message-security-assist-extension 2 facility"),
 184     FEAT_GROUP_INIT("msa3", MSA_EXT_3, "Message-security-assist-extension 3 facility"),
 185     FEAT_GROUP_INIT("msa4", MSA_EXT_4, "Message-security-assist-extension 4 facility"),
 186     FEAT_GROUP_INIT("msa5", MSA_EXT_5, "Message-security-assist-extension 5 facility"),
 187     FEAT_GROUP_INIT("msa6", MSA_EXT_6, "Message-security-assist-extension 6 facility"),
 188     FEAT_GROUP_INIT("msa7", MSA_EXT_7, "Message-security-assist-extension 7 facility"),
 189     FEAT_GROUP_INIT("msa8", MSA_EXT_8, "Message-security-assist-extension 8 facility"),
 190     FEAT_GROUP_INIT("msa9", MSA_EXT_9, "Message-security-assist-extension 9 facility"),
 191     FEAT_GROUP_INIT("msa9_pckmo", MSA_EXT_9_PCKMO, "Message-security-assist-extension 9 PCKMO subfunctions"),
 192     FEAT_GROUP_INIT("mepochptff", MULTIPLE_EPOCH_PTFF, "PTFF enhancements introduced with Multiple-epoch facility"),
 193     FEAT_GROUP_INIT("esort", ENH_SORT, "Enhanced-sort facility"),
 194     FEAT_GROUP_INIT("deflate", DEFLATE_CONVERSION, "Deflate-conversion facility"),
 195 };
 196
 197 const S390FeatGroupDef *s390_feat_group_def(S390FeatGroup group)
 198 {
 199     return &s390_feature_groups[group];
 200 }
 201
 202 static void init_groups(void)
 203 {
 204     int i;
 205
 206     /* init all bitmaps from gnerated data initially */
 207     for (i = 0; i < ARRAY_SIZE(s390_feature_groups); i++) {
 208         s390_init_feat_bitmap(s390_feature_groups[i].init,
 209                               s390_feature_groups[i].feat);
 210     }
 211 }
 212
 213 type_init(init_groups)