tests/qtest/q35-test.c

   1 /*
   2  * QTest testcase for Q35 northbridge
   3  *
   4  * Copyright (c) 2015 Red Hat, Inc.
   5  *
   6  * Author: Gerd Hoffmann <kraxel@redhat.com>
   7  *
   8  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   9  * See the COPYING file in the top-level directory.
  10  */
  11
  12 #include "qemu/osdep.h"
  13 #include "libqtest.h"
  14 #include "libqos/pci.h"
  15 #include "libqos/pci-pc.h"
  16 #include "hw/pci-host/q35.h"
  17 #include "qapi/qmp/qdict.h"
  18
  19 #define TSEG_SIZE_TEST_GUEST_RAM_MBYTES 128
  20
  21 /* @esmramc_tseg_sz: ESMRAMC.TSEG_SZ bitmask for selecting the requested TSEG
  22  *                   size. Must be a subset of
  23  *                   MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_MASK.
  24  *
  25  * @extended_tseg_mbytes: Size of the extended TSEG. Only consulted if
  26  *                        @esmramc_tseg_sz equals
  27  *                        MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_MASK precisely.
  28  *
  29  * @expected_tseg_mbytes: Expected guest-visible TSEG size in megabytes,
  30  *                        matching @esmramc_tseg_sz and @extended_tseg_mbytes
  31  *                        above.
  32  */
  33 struct TsegSizeArgs {
  34     uint8_t esmramc_tseg_sz;
  35     uint16_t extended_tseg_mbytes;
  36     uint16_t expected_tseg_mbytes;
  37 };
  38 typedef struct TsegSizeArgs TsegSizeArgs;
  39
  40 static const TsegSizeArgs tseg_1mb = {
  41     .esmramc_tseg_sz      = MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_1MB,
  42     .extended_tseg_mbytes = 0,
  43     .expected_tseg_mbytes = 1,
  44 };
  45 static const TsegSizeArgs tseg_2mb = {
  46     .esmramc_tseg_sz      = MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_2MB,
  47     .extended_tseg_mbytes = 0,
  48     .expected_tseg_mbytes = 2,
  49 };
  50 static const TsegSizeArgs tseg_8mb = {
  51     .esmramc_tseg_sz      = MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_8MB,
  52     .extended_tseg_mbytes = 0,
  53     .expected_tseg_mbytes = 8,
  54 };
  55 static const TsegSizeArgs tseg_ext_16mb = {
  56     .esmramc_tseg_sz      = MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_MASK,
  57     .extended_tseg_mbytes = 16,
  58     .expected_tseg_mbytes = 16,
  59 };
  60
  61 static void smram_set_bit(QPCIDevice *pcidev, uint8_t mask, bool enabled)
  62 {
  63     uint8_t smram;
  64
  65     smram = qpci_config_readb(pcidev, MCH_HOST_BRIDGE_SMRAM);
  66     if (enabled) {
  67         smram |= mask;
  68     } else {
  69         smram &= ~mask;
  70     }
  71     qpci_config_writeb(pcidev, MCH_HOST_BRIDGE_SMRAM, smram);
  72 }
  73
  74 static bool smram_test_bit(QPCIDevice *pcidev, uint8_t mask)
  75 {
  76     uint8_t smram;
  77
  78     smram = qpci_config_readb(pcidev, MCH_HOST_BRIDGE_SMRAM);
  79     return smram & mask;
  80 }
  81
  82 static void test_smram_lock(void)
  83 {
  84     QPCIBus *pcibus;
  85     QPCIDevice *pcidev;
  86     QDict *response;
  87     QTestState *qts;
  88
  89     qts = qtest_init("-M q35");
  90
  91     pcibus = qpci_new_pc(qts, NULL);
  92     g_assert(pcibus != NULL);
  93
  94     pcidev = qpci_device_find(pcibus, 0);
  95     g_assert(pcidev != NULL);
  96
  97     /* check open is settable */
  98     smram_set_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN, false);
  99     g_assert(smram_test_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN) == false);
 100     smram_set_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN, true);
 101     g_assert(smram_test_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN) == true);
 102
 103     /* lock, check open is cleared & not settable */
 104     smram_set_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_LCK, true);
 105     g_assert(smram_test_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN) == false);
 106     smram_set_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN, true);
 107     g_assert(smram_test_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN) == false);
 108
 109     /* reset */
 110     response = qtest_qmp(qts, "{'execute': 'system_reset', 'arguments': {} }");
 111     g_assert(response);
 112     g_assert(!qdict_haskey(response, "error"));
 113     qobject_unref(response);
 114
 115     /* check open is settable again */
 116     smram_set_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN, false);
 117     g_assert(smram_test_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN) == false);
 118     smram_set_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN, true);
 119     g_assert(smram_test_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN) == true);
 120
 121     g_free(pcidev);
 122     qpci_free_pc(pcibus);
 123
 124     qtest_quit(qts);
 125 }
 126
 127 static void test_tseg_size(const void *data)
 128 {
 129     const TsegSizeArgs *args = data;
 130     QPCIBus *pcibus;
 131     QPCIDevice *pcidev;
 132     uint8_t smram_val;
 133     uint8_t esmramc_val;
 134     uint32_t ram_offs;
 135     QTestState *qts;
 136
 137     if (args->esmramc_tseg_sz == MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_MASK) {
 138         qts = qtest_initf("-M q35 -m %uM -global mch.extended-tseg-mbytes=%u",
 139                           TSEG_SIZE_TEST_GUEST_RAM_MBYTES,
 140                           args->extended_tseg_mbytes);
 141     } else {
 142         qts = qtest_initf("-M q35 -m %uM", TSEG_SIZE_TEST_GUEST_RAM_MBYTES);
 143     }
 144
 145     /* locate the DRAM controller */
 146     pcibus = qpci_new_pc(qts, NULL);
 147     g_assert(pcibus != NULL);
 148     pcidev = qpci_device_find(pcibus, 0);
 149     g_assert(pcidev != NULL);
 150
 151     /* Set TSEG size. Restrict TSEG visibility to SMM by setting T_EN. */
 152     esmramc_val = qpci_config_readb(pcidev, MCH_HOST_BRIDGE_ESMRAMC);
 153     esmramc_val &= ~MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_MASK;
 154     esmramc_val |= args->esmramc_tseg_sz;
 155     esmramc_val |= MCH_HOST_BRIDGE_ESMRAMC_T_EN;
 156     qpci_config_writeb(pcidev, MCH_HOST_BRIDGE_ESMRAMC, esmramc_val);
 157
 158     /* Enable TSEG by setting G_SMRAME. Close TSEG by setting D_CLS. */
 159     smram_val = qpci_config_readb(pcidev, MCH_HOST_BRIDGE_SMRAM);
 160     smram_val &= ~(MCH_HOST_BRIDGE_SMRAM_D_OPEN |
 161                    MCH_HOST_BRIDGE_SMRAM_D_LCK);
 162     smram_val |= (MCH_HOST_BRIDGE_SMRAM_D_CLS |
 163                   MCH_HOST_BRIDGE_SMRAM_G_SMRAME);
 164     qpci_config_writeb(pcidev, MCH_HOST_BRIDGE_SMRAM, smram_val);
 165
 166     /* lock TSEG */
 167     smram_val |= MCH_HOST_BRIDGE_SMRAM_D_LCK;
 168     qpci_config_writeb(pcidev, MCH_HOST_BRIDGE_SMRAM, smram_val);
 169
 170     /* Now check that the byte right before the TSEG is r/w, and that the first
 171      * byte in the TSEG always reads as 0xff.
 172      */
 173     ram_offs = (TSEG_SIZE_TEST_GUEST_RAM_MBYTES - args->expected_tseg_mbytes) *
 174                1024 * 1024 - 1;
 175     g_assert_cmpint(qtest_readb(qts, ram_offs), ==, 0);
 176     qtest_writeb(qts, ram_offs, 1);
 177     g_assert_cmpint(qtest_readb(qts, ram_offs), ==, 1);
 178
 179     ram_offs++;
 180     g_assert_cmpint(qtest_readb(qts, ram_offs), ==, 0xff);
 181     qtest_writeb(qts, ram_offs, 1);
 182     g_assert_cmpint(qtest_readb(qts, ram_offs), ==, 0xff);
 183
 184     g_free(pcidev);
 185     qpci_free_pc(pcibus);
 186     qtest_quit(qts);
 187 }
 188
 189 #define SMBASE 0x30000
 190 #define SMRAM_TEST_PATTERN 0x32
 191 #define SMRAM_TEST_RESET_PATTERN 0x23
 192
 193 static void test_smram_smbase_lock(void)
 194 {
 195     QPCIBus *pcibus;
 196     QPCIDevice *pcidev;
 197     QDict *response;
 198     QTestState *qts;
 199     int i;
 200
 201     qts = qtest_init("-M q35");
 202
 203     pcibus = qpci_new_pc(qts, NULL);
 204     g_assert(pcibus != NULL);
 205
 206     pcidev = qpci_device_find(pcibus, 0);
 207     g_assert(pcidev != NULL);
 208
 209     /* check that SMRAM is not enabled by default */
 210     g_assert(qpci_config_readb(pcidev, MCH_HOST_BRIDGE_F_SMBASE) == 0);
 211     qtest_writeb(qts, SMBASE, SMRAM_TEST_PATTERN);
 212     g_assert_cmpint(qtest_readb(qts, SMBASE), ==, SMRAM_TEST_PATTERN);
 213
 214     /* check that writing junk to 0x9c before before negotiating is ignored */
 215     for (i = 0; i < 0xff; i++) {
 216         qpci_config_writeb(pcidev, MCH_HOST_BRIDGE_F_SMBASE, i);
 217         g_assert(qpci_config_readb(pcidev, MCH_HOST_BRIDGE_F_SMBASE) == 0);
 218     }
 219
 220     /* enable SMRAM at SMBASE */
 221     qpci_config_writeb(pcidev, MCH_HOST_BRIDGE_F_SMBASE, 0xff);
 222     g_assert(qpci_config_readb(pcidev, MCH_HOST_BRIDGE_F_SMBASE) == 0x01);
 223     /* lock SMRAM at SMBASE */
 224     qpci_config_writeb(pcidev, MCH_HOST_BRIDGE_F_SMBASE, 0x02);
 225     g_assert(qpci_config_readb(pcidev, MCH_HOST_BRIDGE_F_SMBASE) == 0x02);
 226
 227     /* check that SMRAM at SMBASE is locked and can't be unlocked */
 228     g_assert_cmpint(qtest_readb(qts, SMBASE), ==, 0xff);
 229     for (i = 0; i <= 0xff; i++) {
 230         /* make sure register is immutable */
 231         qpci_config_writeb(pcidev, MCH_HOST_BRIDGE_F_SMBASE, i);
 232         g_assert(qpci_config_readb(pcidev, MCH_HOST_BRIDGE_F_SMBASE) == 0x02);
 233
 234         /* RAM access should go into black hole */
 235         qtest_writeb(qts, SMBASE, SMRAM_TEST_PATTERN);
 236         g_assert_cmpint(qtest_readb(qts, SMBASE), ==, 0xff);
 237     }
 238
 239     /* reset */
 240     response = qtest_qmp(qts, "{'execute': 'system_reset', 'arguments': {} }");
 241     g_assert(response);
 242     g_assert(!qdict_haskey(response, "error"));
 243     qobject_unref(response);
 244
 245     /* check RAM at SMBASE is available after reset */
 246     g_assert_cmpint(qtest_readb(qts, SMBASE), ==, SMRAM_TEST_PATTERN);
 247     g_assert(qpci_config_readb(pcidev, MCH_HOST_BRIDGE_F_SMBASE) == 0);
 248     qtest_writeb(qts, SMBASE, SMRAM_TEST_RESET_PATTERN);
 249     g_assert_cmpint(qtest_readb(qts, SMBASE), ==, SMRAM_TEST_RESET_PATTERN);
 250
 251     g_free(pcidev);
 252     qpci_free_pc(pcibus);
 253
 254     qtest_quit(qts);
 255 }
 256
 257 static void test_without_smram_base(void)
 258 {
 259     QPCIBus *pcibus;
 260     QPCIDevice *pcidev;
 261     QTestState *qts;
 262     int i;
 263
 264     qts = qtest_init("-M pc-q35-4.1");
 265
 266     pcibus = qpci_new_pc(qts, NULL);
 267     g_assert(pcibus != NULL);
 268
 269     pcidev = qpci_device_find(pcibus, 0);
 270     g_assert(pcidev != NULL);
 271
 272     /* check that RAM is accessible */
 273     qtest_writeb(qts, SMBASE, SMRAM_TEST_PATTERN);
 274     g_assert_cmpint(qtest_readb(qts, SMBASE), ==, SMRAM_TEST_PATTERN);
 275
 276     /* check that writing to 0x9c succeeds */
 277     for (i = 0; i <= 0xff; i++) {
 278         qpci_config_writeb(pcidev, MCH_HOST_BRIDGE_F_SMBASE, i);
 279         g_assert(qpci_config_readb(pcidev, MCH_HOST_BRIDGE_F_SMBASE) == i);
 280     }
 281
 282     /* check that RAM is still accessible */
 283     qtest_writeb(qts, SMBASE, SMRAM_TEST_PATTERN + 1);
 284     g_assert_cmpint(qtest_readb(qts, SMBASE), ==, (SMRAM_TEST_PATTERN + 1));
 285
 286     g_free(pcidev);
 287     qpci_free_pc(pcibus);
 288
 289     qtest_quit(qts);
 290 }
 291
 292 int main(int argc, char **argv)
 293 {
 294     g_test_init(&argc, &argv, NULL);
 295
 296     qtest_add_func("/q35/smram/lock", test_smram_lock);
 297
 298     qtest_add_data_func("/q35/tseg-size/1mb", &tseg_1mb, test_tseg_size);
 299     qtest_add_data_func("/q35/tseg-size/2mb", &tseg_2mb, test_tseg_size);
 300     qtest_add_data_func("/q35/tseg-size/8mb", &tseg_8mb, test_tseg_size);
 301     qtest_add_data_func("/q35/tseg-size/ext/16mb", &tseg_ext_16mb,
 302                         test_tseg_size);
 303     qtest_add_func("/q35/smram/smbase_lock", test_smram_smbase_lock);
 304     qtest_add_func("/q35/smram/legacy_smbase", test_without_smram_base);
 305     return g_test_run();
 306 }