LXR qemu/tests/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 */
  33struct TsegSizeArgs {
  34    uint8_t esmramc_tseg_sz;
  35    uint16_t extended_tseg_mbytes;
  36    uint16_t expected_tseg_mbytes;
  37};
  38typedef struct TsegSizeArgs TsegSizeArgs;
  39
  40static 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};
  45static 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};
  50static 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};
  55static 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
  61static 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
  74static 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
  82static void test_smram_lock(void)
  83{
  84    QPCIBus *pcibus;
  85    QPCIDevice *pcidev;
  86    QDict *response;
  87
  88    qtest_start("-M q35");
  89
  90    pcibus = qpci_new_pc(global_qtest, NULL);
  91    g_assert(pcibus != NULL);
  92
  93    pcidev = qpci_device_find(pcibus, 0);
  94    g_assert(pcidev != NULL);
  95
  96    /* check open is settable */
  97    smram_set_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN, false);
  98    g_assert(smram_test_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN) == false);
  99    smram_set_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN, true);
 100    g_assert(smram_test_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN) == true);
 101
 102    /* lock, check open is cleared & not settable */
 103    smram_set_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_LCK, true);
 104    g_assert(smram_test_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN) == false);
 105    smram_set_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN, true);
 106    g_assert(smram_test_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN) == false);
 107
 108    /* reset */
 109    response = qmp("{'execute': 'system_reset', 'arguments': {} }");
 110    g_assert(response);
 111    g_assert(!qdict_haskey(response, "error"));
 112    qobject_unref(response);
 113
 114    /* check open is settable again */
 115    smram_set_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN, false);
 116    g_assert(smram_test_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN) == false);
 117    smram_set_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN, true);
 118    g_assert(smram_test_bit(pcidev, MCH_HOST_BRIDGE_SMRAM_D_OPEN) == true);
 119
 120    g_free(pcidev);
 121    qpci_free_pc(pcibus);
 122
 123    qtest_end();
 124}
 125
 126static void test_tseg_size(const void *data)
 127{
 128    const TsegSizeArgs *args = data;
 129    char *cmdline;
 130    QPCIBus *pcibus;
 131    QPCIDevice *pcidev;
 132    uint8_t smram_val;
 133    uint8_t esmramc_val;
 134    uint32_t ram_offs;
 135
 136    if (args->esmramc_tseg_sz == MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_MASK) {
 137        cmdline = g_strdup_printf("-M q35 -m %uM "
 138                                  "-global mch.extended-tseg-mbytes=%u",
 139                                  TSEG_SIZE_TEST_GUEST_RAM_MBYTES,
 140                                  args->extended_tseg_mbytes);
 141    } else {
 142        cmdline = g_strdup_printf("-M q35 -m %uM",
 143                                  TSEG_SIZE_TEST_GUEST_RAM_MBYTES);
 144    }
 145    qtest_start(cmdline);
 146    g_free(cmdline);
 147
 148    /* locate the DRAM controller */
 149    pcibus = qpci_new_pc(global_qtest, NULL);
 150    g_assert(pcibus != NULL);
 151    pcidev = qpci_device_find(pcibus, 0);
 152    g_assert(pcidev != NULL);
 153
 154    /* Set TSEG size. Restrict TSEG visibility to SMM by setting T_EN. */
 155    esmramc_val = qpci_config_readb(pcidev, MCH_HOST_BRIDGE_ESMRAMC);
 156    esmramc_val &= ~MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_MASK;
 157    esmramc_val |= args->esmramc_tseg_sz;
 158    esmramc_val |= MCH_HOST_BRIDGE_ESMRAMC_T_EN;
 159    qpci_config_writeb(pcidev, MCH_HOST_BRIDGE_ESMRAMC, esmramc_val);
 160
 161    /* Enable TSEG by setting G_SMRAME. Close TSEG by setting D_CLS. */
 162    smram_val = qpci_config_readb(pcidev, MCH_HOST_BRIDGE_SMRAM);
 163    smram_val &= ~(MCH_HOST_BRIDGE_SMRAM_D_OPEN |
 164                   MCH_HOST_BRIDGE_SMRAM_D_LCK);
 165    smram_val |= (MCH_HOST_BRIDGE_SMRAM_D_CLS |
 166                  MCH_HOST_BRIDGE_SMRAM_G_SMRAME);
 167    qpci_config_writeb(pcidev, MCH_HOST_BRIDGE_SMRAM, smram_val);
 168
 169    /* lock TSEG */
 170    smram_val |= MCH_HOST_BRIDGE_SMRAM_D_LCK;
 171    qpci_config_writeb(pcidev, MCH_HOST_BRIDGE_SMRAM, smram_val);
 172
 173    /* Now check that the byte right before the TSEG is r/w, and that the first
 174     * byte in the TSEG always reads as 0xff.
 175     */
 176    ram_offs = (TSEG_SIZE_TEST_GUEST_RAM_MBYTES - args->expected_tseg_mbytes) *
 177               1024 * 1024 - 1;
 178    g_assert_cmpint(readb(ram_offs), ==, 0);
 179    writeb(ram_offs, 1);
 180    g_assert_cmpint(readb(ram_offs), ==, 1);
 181
 182    ram_offs++;
 183    g_assert_cmpint(readb(ram_offs), ==, 0xff);
 184    writeb(ram_offs, 1);
 185    g_assert_cmpint(readb(ram_offs), ==, 0xff);
 186
 187    g_free(pcidev);
 188    qpci_free_pc(pcibus);
 189    qtest_end();
 190}
 191
 192int main(int argc, char **argv)
 193{
 194    g_test_init(&argc, &argv, NULL);
 195
 196    qtest_add_func("/q35/smram/lock", test_smram_lock);
 197
 198    qtest_add_data_func("/q35/tseg-size/1mb", &tseg_1mb, test_tseg_size);
 199    qtest_add_data_func("/q35/tseg-size/2mb", &tseg_2mb, test_tseg_size);
 200    qtest_add_data_func("/q35/tseg-size/8mb", &tseg_8mb, test_tseg_size);
 201    qtest_add_data_func("/q35/tseg-size/ext/16mb", &tseg_ext_16mb,
 202                        test_tseg_size);
 203    return g_test_run();
 204}
 205