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Re: [PATCH 3/3] qtest: Add a test case for TPM TIS I2C connected to Aspe


From: Cédric Le Goater
Subject: Re: [PATCH 3/3] qtest: Add a test case for TPM TIS I2C connected to Aspeed I2C controller
Date: Tue, 28 Mar 2023 08:44:34 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.9.0

On 3/27/23 22:24, Stefan Berger wrote:
Add a test case for the TPM TIS I2C device exercising most of its
functionality, including localities.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
  tests/qtest/meson.build        |   3 +
  tests/qtest/tpm-tis-i2c-test.c | 637 +++++++++++++++++++++++++++++++++
  2 files changed, 640 insertions(+)
  create mode 100644 tests/qtest/tpm-tis-i2c-test.c

diff --git a/tests/qtest/meson.build b/tests/qtest/meson.build
index 29a4efb4c2..065a00d34d 100644
--- a/tests/qtest/meson.build
+++ b/tests/qtest/meson.build
@@ -200,6 +200,7 @@ qtests_arm = \
    (config_all_devices.has_key('CONFIG_ASPEED_SOC') ? qtests_aspeed : []) + \
    (config_all_devices.has_key('CONFIG_NPCM7XX') ? qtests_npcm7xx : []) + \
    (config_all_devices.has_key('CONFIG_GENERIC_LOADER') ? ['hexloader-test'] : 
[]) + \
+  (config_all_devices.has_key('CONFIG_TPM_TIS_I2C') ? ['tpm-tis-i2c-test'] : 
[]) + \
    ['arm-cpu-features',
     'microbit-test',
     'test-arm-mptimer',
@@ -212,6 +213,7 @@ qtests_aarch64 = \
      ['tpm-tis-device-test', 'tpm-tis-device-swtpm-test'] : []) +              
                           \
    (config_all_devices.has_key('CONFIG_XLNX_ZYNQMP_ARM') ? ['xlnx-can-test', 
'fuzz-xlnx-dp-test'] : []) + \
    (config_all_devices.has_key('CONFIG_RASPI') ? ['bcm2835-dma-test'] : []) +  
\
+  (config_all_devices.has_key('CONFIG_TPM_TIS_I2C') ? ['tpm-tis-i2c-test'] : 
[]) + \
    ['arm-cpu-features',
     'numa-test',
     'boot-serial-test',
@@ -303,6 +305,7 @@ qtests = {
    'tpm-crb-test': [io, tpmemu_files],
    'tpm-tis-swtpm-test': [io, tpmemu_files, 'tpm-tis-util.c'],
    'tpm-tis-test': [io, tpmemu_files, 'tpm-tis-util.c'],
+  'tpm-tis-i2c-test': [io, tpmemu_files, 'qtest_aspeed.c'],
    'tpm-tis-device-swtpm-test': [io, tpmemu_files, 'tpm-tis-util.c'],
    'tpm-tis-device-test': [io, tpmemu_files, 'tpm-tis-util.c'],
    'vmgenid-test': files('boot-sector.c', 'acpi-utils.c'),
diff --git a/tests/qtest/tpm-tis-i2c-test.c b/tests/qtest/tpm-tis-i2c-test.c
new file mode 100644
index 0000000000..94ec423845
--- /dev/null
+++ b/tests/qtest/tpm-tis-i2c-test.c
@@ -0,0 +1,637 @@
+/*
+ * QTest testcases for TPM TIS on I2C (derived from TPM TIS test)
+ *
+ * Copyright (c) 2023 IBM Corporation
+ * Copyright (c) 2023 Red Hat, Inc.
+ *
+ * Authors:
+ *   Stefan Berger <stefanb@linux.ibm.com>
+ *   Marc-André Lureau <marcandre.lureau@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include <glib/gstdio.h>
+
+#include "libqtest-single.h"
+#include "hw/acpi/tpm.h"
+#include "hw/pci/pci_ids.h"
+#include "qtest_aspeed.h"
+#include "tpm-emu.h"
+
+#define DEBUG_TIS_TEST 0
+
+#define DPRINTF(fmt, ...) do { \
+    if (DEBUG_TIS_TEST) { \
+        printf(fmt, ## __VA_ARGS__); \
+    } \
+} while (0)
+
+#define DPRINTF_ACCESS \
+    DPRINTF("%s: %d: locty=%d l=%d access=0x%02x pending_request_flag=0x%x\n", 
\
+            __func__, __LINE__, locty, l, access, pending_request_flag)
+
+#define DPRINTF_STS \
+    DPRINTF("%s: %d: sts = 0x%08x\n", __func__, __LINE__, sts)
+
+#define I2C_SLAVE_ADDR   0x2e
+#define I2C_DEV_BUS_NUM  10
+
+static const uint8_t TPM_CMD[12] =
+    "\x80\x01\x00\x00\x00\x0c\x00\x00\x01\x44\x00\x00";
+
+uint32_t aspeed_dev_addr;

aspeed_bus_addr may be. It should be a static.

+
+uint8_t cur_locty = 0xff;

ditto.


+
+static void tpm_tis_i2c_set_locty(uint8_t locty)
+{
+    if (cur_locty != locty) {
+        cur_locty = locty;
+        aspeed_i2c_writeb(aspeed_dev_addr, I2C_SLAVE_ADDR,
+                          TPM_I2C_REG_LOC_SEL, locty);
+    }
+}
+
+static uint8_t tpm_tis_i2c_readb(uint8_t locty, uint8_t reg)
+{
+    tpm_tis_i2c_set_locty(locty);
+    return aspeed_i2c_readb(aspeed_dev_addr, I2C_SLAVE_ADDR, reg);
+}
+
+static uint16_t tpm_tis_i2c_readw(uint8_t locty, uint8_t reg)
+{
+    tpm_tis_i2c_set_locty(locty);
+    return aspeed_i2c_readw(aspeed_dev_addr, I2C_SLAVE_ADDR, reg);
+}
+
+static uint32_t tpm_tis_i2c_readl(uint8_t locty, uint8_t reg)
+{
+    tpm_tis_i2c_set_locty(locty);
+    return aspeed_i2c_readl(aspeed_dev_addr, I2C_SLAVE_ADDR, reg);
+}
+
+static void tpm_tis_i2c_writeb(uint8_t locty, uint8_t reg, uint8_t v)
+{
+    if (reg != TPM_I2C_REG_LOC_SEL) {
+        tpm_tis_i2c_set_locty(locty);
+    }
+    aspeed_i2c_writeb(aspeed_dev_addr, I2C_SLAVE_ADDR, reg, v);
+}
+
+static void tpm_tis_i2c_writel(uint8_t locty, uint8_t reg, uint32_t v)
+{
+    if (reg != TPM_I2C_REG_LOC_SEL) {
+        tpm_tis_i2c_set_locty(locty);
+    }
+    aspeed_i2c_writel(aspeed_dev_addr, I2C_SLAVE_ADDR, reg, v);
+}
+
+static void tpm_tis_i2c_test_basic(const void *data)
+{
+    uint8_t access;
+    uint32_t v;
+
+    /*
+     * All register accesses below must work without locality 0 being the
+     * active locality. Therefore, ensure access is released.
+     */
+    tpm_tis_i2c_writeb(0, TPM_I2C_REG_ACCESS,
+                       TPM_TIS_ACCESS_ACTIVE_LOCALITY);
+    access = tpm_tis_i2c_readb(0, TPM_I2C_REG_ACCESS);
+    g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+
+    /* read interrupt capability -- none are supported */
+    v = tpm_tis_i2c_readl(0, TPM_I2C_REG_INT_CAPABILITY);
+    g_assert_cmpint(v, ==, 0);
+
+    /* try to enable all interrupts */
+    tpm_tis_i2c_writel(0, TPM_I2C_REG_INT_ENABLE, 0xffffffff);
+    v = tpm_tis_i2c_readl(0, TPM_I2C_REG_INT_ENABLE);
+    /* none could be enabled */
+    g_assert_cmpint(v, ==, 0);
+
+    /* enable csum */
+    tpm_tis_i2c_writeb(0, TPM_I2C_REG_DATA_CSUM_ENABLE, TPM_DATA_CSUM_ENABLED);
+    /* check csum enable register has bit 0 set */
+    v = tpm_tis_i2c_readb(0, TPM_I2C_REG_DATA_CSUM_ENABLE);
+    g_assert_cmpint(v, ==, TPM_DATA_CSUM_ENABLED);
+    /* reading it as 32bit register returns same result */
+    v = tpm_tis_i2c_readl(0, TPM_I2C_REG_DATA_CSUM_ENABLE);
+    g_assert_cmpint(v, ==, TPM_DATA_CSUM_ENABLED);
+
+    /* disable csum */
+    tpm_tis_i2c_writeb(0, TPM_I2C_REG_DATA_CSUM_ENABLE, 0);
+    /* check csum enable register has bit 0 clear */
+    v = tpm_tis_i2c_readb(0, TPM_I2C_REG_DATA_CSUM_ENABLE);
+    g_assert_cmpint(v, ==, 0);
+
+    /* write to unsupported register '1' */
+    tpm_tis_i2c_writel(0, 1, 0x12345678);
+    v = tpm_tis_i2c_readl(0, 1);
+    g_assert_cmpint(v, ==, 0xffffffff);
+}
+
+static void tpm_tis_i2c_test_check_localities(const void *data)
+{
+    uint8_t locty, l;
+    uint8_t access;
+    uint32_t capability, i2c_cap;
+    uint32_t didvid;
+    uint32_t rid;
+
+    for (locty = 0; locty < TPM_TIS_NUM_LOCALITIES; locty++) {
+        access = tpm_tis_i2c_readb(locty, TPM_I2C_REG_ACCESS);
+        g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                    TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+
+        capability = tpm_tis_i2c_readl(locty, TPM_I2C_REG_INTF_CAPABILITY);
+        i2c_cap = (TPM_I2C_CAP_INTERFACE_TYPE |
+                   TPM_I2C_CAP_INTERFACE_VER  |
+                   TPM_I2C_CAP_TPM2_FAMILY    |
+                   TPM_I2C_CAP_LOCALITY_CAP   |
+                   TPM_I2C_CAP_BUS_SPEED      |
+                   TPM_I2C_CAP_DEV_ADDR_CHANGE);
+        g_assert_cmpint(capability, ==, i2c_cap);
+
+        didvid = tpm_tis_i2c_readl(locty, TPM_I2C_REG_DID_VID);
+        g_assert_cmpint(didvid, ==, (1 << 16) | PCI_VENDOR_ID_IBM);
+
+        rid = tpm_tis_i2c_readl(locty, TPM_I2C_REG_RID);
+        g_assert_cmpint(rid, !=, 0);
+        g_assert_cmpint(rid, !=, 0xffffffff);
+
+        /* locality selection must be at locty */
+        l = tpm_tis_i2c_readb(locty, TPM_I2C_REG_LOC_SEL);
+        g_assert_cmpint(l, ==, locty);
+    }
+}
+
+static void tpm_tis_i2c_test_check_access_reg(const void *data)
+{
+    uint8_t locty;
+    uint8_t access;
+
+    /* do not test locality 4 (hw only) */
+    for (locty = 0; locty < TPM_TIS_NUM_LOCALITIES - 1; locty++) {
+        access = tpm_tis_i2c_readb(locty, TPM_I2C_REG_ACCESS);
+        g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                    TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+
+        /* request use of locality */
+        tpm_tis_i2c_writeb(locty, TPM_I2C_REG_ACCESS,
+                           TPM_TIS_ACCESS_REQUEST_USE);
+
+        access = tpm_tis_i2c_readb(locty, TPM_I2C_REG_ACCESS);
+        g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                    TPM_TIS_ACCESS_ACTIVE_LOCALITY |
+                                    TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+
+        /* release access */
+        tpm_tis_i2c_writeb(locty, TPM_I2C_REG_ACCESS,
+                           TPM_TIS_ACCESS_ACTIVE_LOCALITY);
+        access = tpm_tis_i2c_readb(locty, TPM_I2C_REG_ACCESS);
+        g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                    TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+    }
+}
+
+/*
+ * Test case for seizing access by a higher number locality
+ */
+static void tpm_tis_i2c_test_check_access_reg_seize(const void *data)
+{
+    int locty, l;
+    uint8_t access;
+    uint8_t pending_request_flag;
+
+    /* do not test locality 4 (hw only) */
+    for (locty = 0; locty < TPM_TIS_NUM_LOCALITIES - 1; locty++) {
+        pending_request_flag = 0;
+
+        access = tpm_tis_i2c_readb(locty, TPM_I2C_REG_ACCESS);
+        g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                    TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+
+        /* request use of locality */
+        tpm_tis_i2c_writeb(locty,
+                           TPM_I2C_REG_ACCESS, TPM_TIS_ACCESS_REQUEST_USE);
+        access = tpm_tis_i2c_readb(locty, TPM_I2C_REG_ACCESS);
+        g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                    TPM_TIS_ACCESS_ACTIVE_LOCALITY |
+                                    TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+
+        /* lower localities cannot seize access */
+        for (l = 0; l < locty; l++) {
+            /* lower locality is not active */
+            access = tpm_tis_i2c_readb(l, TPM_I2C_REG_ACCESS);
+            DPRINTF_ACCESS;
+            g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                        pending_request_flag |
+                                        TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+
+            /* try to request use from 'l' */
+            tpm_tis_i2c_writeb(l,
+                               TPM_I2C_REG_ACCESS,
+                               TPM_TIS_ACCESS_REQUEST_USE);
+
+            /*
+             * requesting use from 'l' was not possible;
+             * we must see REQUEST_USE and possibly PENDING_REQUEST
+             */
+            access = tpm_tis_i2c_readb(l, TPM_I2C_REG_ACCESS);
+            DPRINTF_ACCESS;
+            g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                        TPM_TIS_ACCESS_REQUEST_USE |
+                                        pending_request_flag |
+                                        TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+
+            /*
+             * locality 'locty' must be unchanged;
+             * we must see PENDING_REQUEST
+             */
+            access = tpm_tis_i2c_readb(locty, TPM_I2C_REG_ACCESS);
+            g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                        TPM_TIS_ACCESS_ACTIVE_LOCALITY |
+                                        TPM_TIS_ACCESS_PENDING_REQUEST |
+                                        TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+
+            /* try to seize from 'l' */
+            tpm_tis_i2c_writeb(l,
+                               TPM_I2C_REG_ACCESS, TPM_TIS_ACCESS_SEIZE);
+            /* seize from 'l' was not possible */
+            access = tpm_tis_i2c_readb(l, TPM_I2C_REG_ACCESS);
+            DPRINTF_ACCESS;
+            g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                        TPM_TIS_ACCESS_REQUEST_USE |
+                                        pending_request_flag |
+                                        TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+
+            /* locality 'locty' must be unchanged */
+            access = tpm_tis_i2c_readb(locty, TPM_I2C_REG_ACCESS);
+            g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                        TPM_TIS_ACCESS_ACTIVE_LOCALITY |
+                                        TPM_TIS_ACCESS_PENDING_REQUEST |
+                                        TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+
+            /*
+             * on the next loop we will have a PENDING_REQUEST flag
+             * set for locality 'l'
+             */
+            pending_request_flag = TPM_TIS_ACCESS_PENDING_REQUEST;
+        }
+
+        /*
+         * higher localities can 'seize' access but not 'request use';
+         * note: this will activate first l+1, then l+2 etc.
+         */
+        for (l = locty + 1; l < TPM_TIS_NUM_LOCALITIES - 1; l++) {
+            /* try to 'request use' from 'l' */
+            tpm_tis_i2c_writeb(l, TPM_I2C_REG_ACCESS,
+                               TPM_TIS_ACCESS_REQUEST_USE);
+
+            /*
+             * requesting use from 'l' was not possible; we should see
+             * REQUEST_USE and may see PENDING_REQUEST
+             */
+            access = tpm_tis_i2c_readb(l, TPM_I2C_REG_ACCESS);
+            DPRINTF_ACCESS;
+            g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                        TPM_TIS_ACCESS_REQUEST_USE |
+                                        pending_request_flag |
+                                        TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+
+            /*
+             * locality 'l-1' must be unchanged; we should always
+             * see PENDING_REQUEST from 'l' requesting access
+             */
+            access = tpm_tis_i2c_readb(l - 1, TPM_I2C_REG_ACCESS);
+            DPRINTF_ACCESS;
+            g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                        TPM_TIS_ACCESS_ACTIVE_LOCALITY |
+                                        TPM_TIS_ACCESS_PENDING_REQUEST |
+                                        TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+
+            /* try to seize from 'l' */
+            tpm_tis_i2c_writeb(l, TPM_I2C_REG_ACCESS, TPM_TIS_ACCESS_SEIZE);
+
+            /* seize from 'l' was possible */
+            access = tpm_tis_i2c_readb(l, TPM_I2C_REG_ACCESS);
+            DPRINTF_ACCESS;
+            g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                        TPM_TIS_ACCESS_ACTIVE_LOCALITY |
+                                        pending_request_flag |
+                                        TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+
+            /* l - 1 should show that it has BEEN_SEIZED */
+            access = tpm_tis_i2c_readb(l - 1, TPM_I2C_REG_ACCESS);
+            DPRINTF_ACCESS;
+            g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                        TPM_TIS_ACCESS_BEEN_SEIZED |
+                                        pending_request_flag |
+                                        TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+
+            /* clear the BEEN_SEIZED flag and make sure it's gone */
+            tpm_tis_i2c_writeb(l - 1, TPM_I2C_REG_ACCESS,
+                               TPM_TIS_ACCESS_BEEN_SEIZED);
+
+            access = tpm_tis_i2c_readb(l - 1, TPM_I2C_REG_ACCESS);
+            g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                        pending_request_flag |
+                                        TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+        }
+
+        /*
+         * PENDING_REQUEST will not be set if locty = 0 since all localities
+         * were active; in case of locty = 1, locality 0 will be active
+         * but no PENDING_REQUEST anywhere
+         */
+        if (locty <= 1) {
+            pending_request_flag = 0;
+        }
+
+        /* release access from l - 1; this activates locty - 1 */
+        l--;
+
+        access = tpm_tis_i2c_readb(l, TPM_I2C_REG_ACCESS);
+        DPRINTF_ACCESS;
+
+        DPRINTF("%s: %d: relinquishing control on l = %d\n",
+                __func__, __LINE__, l);
+        tpm_tis_i2c_writeb(l, TPM_I2C_REG_ACCESS,
+                           TPM_TIS_ACCESS_ACTIVE_LOCALITY);
+
+        access = tpm_tis_i2c_readb(l, TPM_I2C_REG_ACCESS);
+        DPRINTF_ACCESS;
+        g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                    pending_request_flag |
+                                    TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+
+        for (l = locty - 1; l >= 0; l--) {
+            access = tpm_tis_i2c_readb(l, TPM_I2C_REG_ACCESS);
+            DPRINTF_ACCESS;
+            g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                        TPM_TIS_ACCESS_ACTIVE_LOCALITY |
+                                        pending_request_flag |
+                                        TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+
+            /* release this locality */
+            tpm_tis_i2c_writeb(l, TPM_I2C_REG_ACCESS,
+                               TPM_TIS_ACCESS_ACTIVE_LOCALITY);
+
+            if (l == 1) {
+                pending_request_flag = 0;
+            }
+        }
+
+        /* no locality may be active now */
+        for (l = 0; l < TPM_TIS_NUM_LOCALITIES - 1; l++) {
+            access = tpm_tis_i2c_readb(l, TPM_I2C_REG_ACCESS);
+            DPRINTF_ACCESS;
+            g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                        TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+        }
+    }
+}
+
+/*
+ * Test case for getting access when higher number locality relinquishes access
+ */
+static void tpm_tis_i2c_test_check_access_reg_release(const void *data)
+{
+    int locty, l;
+    uint8_t access;
+    uint8_t pending_request_flag;
+
+    /* do not test locality 4 (hw only) */
+    for (locty = TPM_TIS_NUM_LOCALITIES - 2; locty >= 0; locty--) {
+        pending_request_flag = 0;
+
+        access = tpm_tis_i2c_readb(locty, TPM_I2C_REG_ACCESS);
+        g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                    TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+
+        /* request use of locality */
+        tpm_tis_i2c_writeb(locty, TPM_I2C_REG_ACCESS,
+                           TPM_TIS_ACCESS_REQUEST_USE);
+        access = tpm_tis_i2c_readb(locty, TPM_I2C_REG_ACCESS);
+        g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                    TPM_TIS_ACCESS_ACTIVE_LOCALITY |
+                                    TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+
+        /* request use of all other localities */
+        for (l = 0; l < TPM_TIS_NUM_LOCALITIES - 1; l++) {
+            if (l == locty) {
+                continue;
+            }
+            /*
+             * request use of locality 'l' -- we MUST see REQUEST USE and
+             * may see PENDING_REQUEST
+             */
+            tpm_tis_i2c_writeb(l, TPM_I2C_REG_ACCESS,
+                               TPM_TIS_ACCESS_REQUEST_USE);
+            access = tpm_tis_i2c_readb(l, TPM_I2C_REG_ACCESS);
+            DPRINTF_ACCESS;
+            g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                        TPM_TIS_ACCESS_REQUEST_USE |
+                                        pending_request_flag |
+                                        TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+            pending_request_flag = TPM_TIS_ACCESS_PENDING_REQUEST;
+        }
+        /* release locality 'locty' */
+        tpm_tis_i2c_writeb(locty, TPM_I2C_REG_ACCESS,
+                           TPM_TIS_ACCESS_ACTIVE_LOCALITY);
+        /*
+         * highest locality should now be active; release it and make sure the
+         * next higest locality is active afterwards
+         */
+        for (l = TPM_TIS_NUM_LOCALITIES - 2; l >= 0; l--) {
+            if (l == locty) {
+                continue;
+            }
+            /* 'l' should be active now */
+            access = tpm_tis_i2c_readb(l, TPM_I2C_REG_ACCESS);
+            DPRINTF_ACCESS;
+            g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                        TPM_TIS_ACCESS_ACTIVE_LOCALITY |
+                                        pending_request_flag |
+                                        TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+            /* 'l' relinquishes access */
+            tpm_tis_i2c_writeb(l, TPM_I2C_REG_ACCESS,
+                               TPM_TIS_ACCESS_ACTIVE_LOCALITY);
+            access = tpm_tis_i2c_readb(l, TPM_I2C_REG_ACCESS);
+            DPRINTF_ACCESS;
+            if (l == 1 || (locty <= 1 && l == 2)) {
+                pending_request_flag = 0;
+            }
+            g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                        pending_request_flag |
+                                        TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+        }
+    }
+}
+
+/*
+ * Test case for transmitting packets
+ */
+static void tpm_tis_i2c_test_check_transmit(const void *data)
+{
+    const TPMTestState *s = data;
+    uint8_t access;
+    uint32_t sts, v;
+    uint16_t bcount, csum;
+    size_t i;
+
+    /* enable csum */
+    tpm_tis_i2c_writeb(0, TPM_I2C_REG_DATA_CSUM_ENABLE, TPM_DATA_CSUM_ENABLED);
+    /* check csum enable register has bit 0 set */
+    v = tpm_tis_i2c_readb(0, TPM_I2C_REG_DATA_CSUM_ENABLE);
+    g_assert_cmpint(v, ==, TPM_DATA_CSUM_ENABLED);
+    /* reading it as 32bit register returns same result */
+    v = tpm_tis_i2c_readl(0, TPM_I2C_REG_DATA_CSUM_ENABLE);
+    g_assert_cmpint(v, ==, TPM_DATA_CSUM_ENABLED);
+
+    /* request use of locality 0 */
+    tpm_tis_i2c_writeb(0, TPM_I2C_REG_ACCESS, TPM_TIS_ACCESS_REQUEST_USE);
+    access = tpm_tis_i2c_readb(0, TPM_I2C_REG_ACCESS);
+    g_assert_cmpint(access, ==, TPM_TIS_ACCESS_TPM_REG_VALID_STS |
+                                TPM_TIS_ACCESS_ACTIVE_LOCALITY |
+                                TPM_TIS_ACCESS_TPM_ESTABLISHMENT);
+
+    sts = tpm_tis_i2c_readl(0, TPM_I2C_REG_STS);
+    DPRINTF_STS;
+
+    g_assert_cmpint(sts & 0xff, ==, 0);
+
+    bcount = (sts >> 8) & 0xffff;
+    g_assert_cmpint(bcount, >=, 128);
+
+    /* ic2 must have bits 26-31 zero */
+    g_assert_cmpint(sts & (0x1f << 26), ==, 0);
+
+    tpm_tis_i2c_writel(0, TPM_I2C_REG_STS, TPM_TIS_STS_COMMAND_READY);
+    sts = tpm_tis_i2c_readl(0, TPM_I2C_REG_STS);
+    DPRINTF_STS;
+    g_assert_cmpint(sts & 0xff, ==, TPM_TIS_STS_COMMAND_READY);
+
+    /* transmit command */
+    for (i = 0; i < sizeof(TPM_CMD); i++) {
+        tpm_tis_i2c_writeb(0, TPM_I2C_REG_DATA_FIFO, TPM_CMD[i]);
+        sts = tpm_tis_i2c_readl(0, TPM_I2C_REG_STS);
+        DPRINTF_STS;
+        if (i < sizeof(TPM_CMD) - 1) {
+            g_assert_cmpint(sts & 0xff, ==,
+                            TPM_TIS_STS_EXPECT | TPM_TIS_STS_VALID);
+        } else {
+            g_assert_cmpint(sts & 0xff, ==, TPM_TIS_STS_VALID);
+        }
+        g_assert_cmpint((sts >> 8) & 0xffff, ==, --bcount);
+    }
+    /* read the checksum */
+    csum = tpm_tis_i2c_readw(0, TPM_I2C_REG_DATA_CSUM_GET);
+    g_assert_cmpint(csum, ==, 0x6733);
+
+    /* start processing */
+    tpm_tis_i2c_writeb(0, TPM_I2C_REG_STS, TPM_TIS_STS_TPM_GO);
+
+    uint64_t end_time = g_get_monotonic_time() + 50 * G_TIME_SPAN_SECOND;
+    do {
+        sts = tpm_tis_i2c_readl(0, TPM_I2C_REG_STS);
+        if ((sts & TPM_TIS_STS_DATA_AVAILABLE) != 0) {
+            break;
+        }
+    } while (g_get_monotonic_time() < end_time);
+
+    sts = tpm_tis_i2c_readl(0, TPM_I2C_REG_STS);
+    DPRINTF_STS;
+    g_assert_cmpint(sts & 0xff, == ,
+                    TPM_TIS_STS_VALID | TPM_TIS_STS_DATA_AVAILABLE);
+    bcount = (sts >> 8) & 0xffff;
+
+    /* read response */
+    uint8_t tpm_msg[sizeof(struct tpm_hdr)];
+    g_assert_cmpint(sizeof(tpm_msg), ==, bcount);
+
+    for (i = 0; i < sizeof(tpm_msg); i++) {
+        tpm_msg[i] = tpm_tis_i2c_readb(0, TPM_I2C_REG_DATA_FIFO);
+        sts = tpm_tis_i2c_readl(0, TPM_I2C_REG_STS);
+        DPRINTF_STS;
+        if (sts & TPM_TIS_STS_DATA_AVAILABLE) {
+            g_assert_cmpint((sts >> 8) & 0xffff, ==, --bcount);
+        }
+    }
+    g_assert_cmpmem(tpm_msg, sizeof(tpm_msg), s->tpm_msg, sizeof(*s->tpm_msg));
+
+    /* relinquish use of locality 0 */
+    tpm_tis_i2c_writeb(0,
+                       TPM_I2C_REG_ACCESS, TPM_TIS_ACCESS_ACTIVE_LOCALITY);
+    access = tpm_tis_i2c_readb(0, TPM_I2C_REG_ACCESS);
+}
+
+int main(int argc, char **argv)
+{
+    int ret;
+    char *args;
+    char *tmp_path = g_dir_make_tmp("qemu-tpm-tis-i2c-test.XXXXXX", NULL);
+    GThread *thread;
+    TPMTestState test;
+
+    module_call_init(MODULE_INIT_QOM);
+    g_test_init(&argc, &argv, NULL);
+
+    test.addr = g_new0(SocketAddress, 1);
+    test.addr->type = SOCKET_ADDRESS_TYPE_UNIX;
+    test.addr->u.q_unix.path = g_build_filename(tmp_path, "sock", NULL);
+    g_mutex_init(&test.data_mutex);
+    g_cond_init(&test.data_cond);
+    test.data_cond_signal = false;
+    test.tpm_version = TPM_VERSION_2_0;
+
+    thread = g_thread_new(NULL, tpm_emu_ctrl_thread, &test);
+    tpm_emu_test_wait_cond(&test);
+
+    aspeed_dev_addr = ast2600_aspeed_i2c_calc_dev_addr(I2C_DEV_BUS_NUM);
+
+    args = g_strdup_printf(
+        "-machine rainier-bmc -accel tcg "
+        "-chardev socket,id=chr,path=%s "
+        "-tpmdev emulator,id=tpm0,chardev=chr "
+        "-device tpm-tis-i2c,tpmdev=tpm0,bus=aspeed.i2c.bus.%d,address=0x%x",
+        test.addr->u.q_unix.path,
+        I2C_DEV_BUS_NUM,
+        I2C_SLAVE_ADDR);
+    qtest_start(args);
+
+    qtest_add_data_func("/tpm-tis-i2c/test_basic", &test,
+                        tpm_tis_i2c_test_basic);
+
+    qtest_add_data_func("/tpm-tis-i2c/test_check_localities", &test,
+                        tpm_tis_i2c_test_check_localities);
+
+    qtest_add_data_func("/tpm-tis-i2c/check_access_reg", &test,
+                        tpm_tis_i2c_test_check_access_reg);
+
+    qtest_add_data_func("/tpm-tis-i2c/check_access_reg_seize", &test,
+                        tpm_tis_i2c_test_check_access_reg_seize);
+
+    qtest_add_data_func("/tpm-tis-i2c/check_access_reg_release", &test,
+                        tpm_tis_i2c_test_check_access_reg_release);
+
+    qtest_add_data_func("/tpm-tis-i2c/test_check_transmit", &test,
+                        tpm_tis_i2c_test_check_transmit);
+
+    ret = g_test_run();
+
+    qtest_end();
+
+    g_thread_join(thread);
+    g_unlink(test.addr->u.q_unix.path);
+    qapi_free_SocketAddress(test.addr);
+    g_rmdir(tmp_path);
+    g_free(tmp_path);
+    g_free(args);
+    return ret;
+}




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