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tpm: Add support for TPM device over I2C bus 

Qemu already supports devices attached to ISA and sysbus. This drop adds
support for the I2C bus attached TPM devices. I2C model only supports
TPM2 protocol.

This commit includes changes for the common code.
- Added I2C emulation model. Logic was added in the model to temporarily
  cache the data as I2C interface works per byte basis.
- New tpm type "tpm-tis-i2c" added for I2C support. The user has to
  provide this string on command line.

Testing:
  TPM I2C device module is tested using SWTPM (software based TPM
  package). Qemu uses the rainier machine and is connected to swtpm over
  the socket interface.

  The command to start swtpm is as follows:
  $ swtpm socket --tpmstate dir=/tmp/mytpm1    \
                 --ctrl type=unixio,path=/tmp/mytpm1/swtpm-sock  \
                 --tpm2 --log level=100

  The command to start qemu is as follows:
  $ qemu-system-arm -M rainier-bmc -nographic \
            -kernel ${IMAGEPATH}/fitImage-linux.bin \
            -dtb ${IMAGEPATH}/aspeed-bmc-ibm-rainier.dtb \
            -initrd ${IMAGEPATH}/obmc-phosphor-initramfs.rootfs.cpio.xz \
            -drive file=${IMAGEPATH}/obmc-phosphor-image.rootfs.wic.qcow2,if=sd,index=2 \
            -net nic -net user,hostfwd=:127.0.0.1:2222-:22,hostfwd=:127.0.0.1:2443-:443 \
            -chardev socket,id=chrtpm,path=/tmp/mytpm1/swtpm-sock \
            -tpmdev emulator,id=tpm0,chardev=chrtpm \
            -device tpm-tis-i2c,tpmdev=tpm0,bus=aspeed.i2c.bus.12,address=0x2e

Signed-off-by: Ninad Palsule <ninad@linux.ibm.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Tested-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Tested-by: Joel Stanley <joel@jms.id.au>
Message-id: 20230414220754.1191476-4-ninadpalsule@us.ibm.com
master
Ninad Palsule 2023-04-14 17:07:54 -05:00 committed by Stefan Berger
parent bbadfb2e0a
commit 139fdb3ed8
6 changed files with 589 additions and 0 deletions
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1
hw/arm/Kconfig
View File

@ -6,6 +6,7 @@ config ARM_VIRT
imply VFIO_PLATFORM
imply VFIO_XGMAC
imply TPM_TIS_SYSBUS
imply TPM_TIS_I2C
imply NVDIMM
select ARM_GIC
select ACPI

7
hw/tpm/Kconfig
View File

@ -1,3 +1,10 @@
config TPM_TIS_I2C
bool
depends on TPM
select TPM_BACKEND
select I2C
select TPM_TIS
config TPM_TIS_ISA
bool
depends on TPM && ISA_BUS

1
hw/tpm/meson.build
View File

@ -1,6 +1,7 @@
softmmu_ss.add(when: 'CONFIG_TPM_TIS', if_true: files('tpm_tis_common.c'))
softmmu_ss.add(when: 'CONFIG_TPM_TIS_ISA', if_true: files('tpm_tis_isa.c'))
softmmu_ss.add(when: 'CONFIG_TPM_TIS_SYSBUS', if_true: files('tpm_tis_sysbus.c'))
softmmu_ss.add(when: 'CONFIG_TPM_TIS_I2C', if_true: files('tpm_tis_i2c.c'))
softmmu_ss.add(when: 'CONFIG_TPM_CRB', if_true: files('tpm_crb.c'))
softmmu_ss.add(when: 'CONFIG_TPM_TIS', if_true: files('tpm_ppi.c'))
softmmu_ss.add(when: 'CONFIG_TPM_CRB', if_true: files('tpm_ppi.c'))

571
hw/tpm/tpm_tis_i2c.c Normal file
View File

@ -0,0 +1,571 @@
/*
* tpm_tis_i2c.c - QEMU's TPM TIS I2C Device
*
* Copyright (c) 2023 IBM Corporation
*
* Authors:
* Ninad Palsule <ninad@linux.ibm.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.
*
* TPM I2C implementation follows TCG TPM I2c Interface specification,
* Family 2.0, Level 00, Revision 1.00
*
* TPM TIS for TPM 2 implementation following TCG PC Client Platform
* TPM Profile (PTP) Specification, Familiy 2.0, Revision 00.43
*
*/
#include "qemu/osdep.h"
#include "hw/i2c/i2c.h"
#include "hw/sysbus.h"
#include "hw/acpi/tpm.h"
#include "migration/vmstate.h"
#include "tpm_prop.h"
#include "qemu/log.h"
#include "trace.h"
#include "tpm_tis.h"
/* Operations */
#define OP_SEND 1
#define OP_RECV 2
/* Is locality valid */
#define TPM_TIS_I2C_IS_VALID_LOCTY(x) TPM_TIS_IS_VALID_LOCTY(x)
typedef struct TPMStateI2C {
/*< private >*/
I2CSlave parent_obj;
uint8_t offset; /* offset into data[] */
uint8_t operation; /* OP_SEND & OP_RECV */
uint8_t data[5]; /* Data */
/* i2c registers */
uint8_t loc_sel; /* Current locality */
uint8_t csum_enable; /* Is checksum enabled */
/* Derived from the above */
const char *reg_name; /* Register name */
uint32_t tis_addr; /* Converted tis address including locty */
/*< public >*/
TPMState state; /* not a QOM object */
} TPMStateI2C;
DECLARE_INSTANCE_CHECKER(TPMStateI2C, TPM_TIS_I2C,
TYPE_TPM_TIS_I2C)
/* Prototype */
static inline void tpm_tis_i2c_to_tis_reg(TPMStateI2C *i2cst, uint8_t i2c_reg);
/* Register map */
typedef struct regMap {
uint8_t i2c_reg; /* I2C register */
uint16_t tis_reg; /* TIS register */
const char *reg_name; /* Register name */
} I2CRegMap;
/*
* The register values in the common code is different than the latest
* register numbers as per the spec hence add the conversion map
*/
static const I2CRegMap tpm_tis_reg_map[] = {
/*
* These registers are sent to TIS layer. The register with UNKNOWN
* mapping are not sent to TIS layer and handled in I2c layer.
* NOTE: Adding frequently used registers at the start
*/
{ TPM_I2C_REG_DATA_FIFO, TPM_TIS_REG_DATA_FIFO, "FIFO", },
{ TPM_I2C_REG_STS, TPM_TIS_REG_STS, "STS", },
{ TPM_I2C_REG_DATA_CSUM_GET, TPM_I2C_REG_UNKNOWN, "CSUM_GET", },
{ TPM_I2C_REG_LOC_SEL, TPM_I2C_REG_UNKNOWN, "LOC_SEL", },
{ TPM_I2C_REG_ACCESS, TPM_TIS_REG_ACCESS, "ACCESS", },
{ TPM_I2C_REG_INT_ENABLE, TPM_TIS_REG_INT_ENABLE, "INTR_ENABLE",},
{ TPM_I2C_REG_INT_CAPABILITY, TPM_I2C_REG_UNKNOWN, "INTR_CAP", },
{ TPM_I2C_REG_INTF_CAPABILITY, TPM_TIS_REG_INTF_CAPABILITY, "INTF_CAP", },
{ TPM_I2C_REG_DID_VID, TPM_TIS_REG_DID_VID, "DID_VID", },
{ TPM_I2C_REG_RID, TPM_TIS_REG_RID, "RID", },
{ TPM_I2C_REG_I2C_DEV_ADDRESS, TPM_I2C_REG_UNKNOWN, "DEV_ADDRESS",},
{ TPM_I2C_REG_DATA_CSUM_ENABLE, TPM_I2C_REG_UNKNOWN, "CSUM_ENABLE",},
};
static int tpm_tis_i2c_pre_save(void *opaque)
{
TPMStateI2C *i2cst = opaque;
return tpm_tis_pre_save(&i2cst->state);
}
static int tpm_tis_i2c_post_load(void *opaque, int version_id)
{
TPMStateI2C *i2cst = opaque;
if (i2cst->offset >= 1) {
tpm_tis_i2c_to_tis_reg(i2cst, i2cst->data[0]);
}
return 0;
}
static const VMStateDescription vmstate_tpm_tis_i2c = {
.name = "tpm-tis-i2c",
.version_id = 0,
.pre_save = tpm_tis_i2c_pre_save,
.post_load = tpm_tis_i2c_post_load,
.fields = (VMStateField[]) {
VMSTATE_BUFFER(state.buffer, TPMStateI2C),
VMSTATE_UINT16(state.rw_offset, TPMStateI2C),
VMSTATE_UINT8(state.active_locty, TPMStateI2C),
VMSTATE_UINT8(state.aborting_locty, TPMStateI2C),
VMSTATE_UINT8(state.next_locty, TPMStateI2C),
VMSTATE_STRUCT_ARRAY(state.loc, TPMStateI2C, TPM_TIS_NUM_LOCALITIES, 0,
vmstate_locty, TPMLocality),
/* i2c specifics */
VMSTATE_UINT8(offset, TPMStateI2C),
VMSTATE_UINT8(operation, TPMStateI2C),
VMSTATE_BUFFER(data, TPMStateI2C),
VMSTATE_UINT8(loc_sel, TPMStateI2C),
VMSTATE_UINT8(csum_enable, TPMStateI2C),
VMSTATE_END_OF_LIST()
}
};
/*
* Set data value. The i2cst->offset is not updated as called in
* the read path.
*/
static void tpm_tis_i2c_set_data(TPMStateI2C *i2cst, uint32_t data)
{
i2cst->data[1] = data;
i2cst->data[2] = data >> 8;
i2cst->data[3] = data >> 16;
i2cst->data[4] = data >> 24;
}
/*
* Generate interface capability based on what is returned by TIS and what is
* expected by I2C. Save the capability in the data array overwriting the TIS
* capability.
*/
static uint32_t tpm_tis_i2c_interface_capability(TPMStateI2C *i2cst,
uint32_t tis_cap)
{
uint32_t i2c_cap;
/* Now generate i2c 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);
/* Now check the TIS and set some capabilities */
/* Static burst count set */
if (tis_cap & TPM_TIS_CAP_BURST_COUNT_STATIC) {
i2c_cap |= TPM_I2C_CAP_BURST_COUNT_STATIC;
}
return i2c_cap;
}
/* Convert I2C register to TIS address and returns the name of the register */
static inline void tpm_tis_i2c_to_tis_reg(TPMStateI2C *i2cst, uint8_t i2c_reg)
{
const I2CRegMap *reg_map;
int i;
i2cst->tis_addr = 0xffffffff;
/* Special case for the STS register. */
if (i2c_reg >= TPM_I2C_REG_STS && i2c_reg <= TPM_I2C_REG_STS + 3) {
i2c_reg = TPM_I2C_REG_STS;
}
for (i = 0; i < ARRAY_SIZE(tpm_tis_reg_map); i++) {
reg_map = &tpm_tis_reg_map[i];
if (reg_map->i2c_reg == i2c_reg) {
i2cst->reg_name = reg_map->reg_name;
i2cst->tis_addr = reg_map->tis_reg;
/* Include the locality in the address. */
assert(TPM_TIS_I2C_IS_VALID_LOCTY(i2cst->loc_sel));
i2cst->tis_addr += (i2cst->loc_sel << TPM_TIS_LOCALITY_SHIFT);
break;
}
}
}
/* Clear some fields from the structure. */
static inline void tpm_tis_i2c_clear_data(TPMStateI2C *i2cst)
{
/* Clear operation and offset */
i2cst->operation = 0;
i2cst->offset = 0;
i2cst->tis_addr = 0xffffffff;
i2cst->reg_name = NULL;
memset(i2cst->data, 0, sizeof(i2cst->data));
return;
}
/* Send data to TPM */
static inline void tpm_tis_i2c_tpm_send(TPMStateI2C *i2cst)
{
uint32_t data;
size_t offset = 0;
uint32_t sz = 4;
if ((i2cst->operation == OP_SEND) && (i2cst->offset > 1)) {
switch (i2cst->data[0]) {
case TPM_I2C_REG_DATA_CSUM_ENABLE:
/*
* Checksum is not handled by TIS code hence we will consume the
* register here.
*/
i2cst->csum_enable = i2cst->data[1] & TPM_DATA_CSUM_ENABLED;
break;
case TPM_I2C_REG_DATA_FIFO:
/* Handled in the main i2c_send function */
break;
case TPM_I2C_REG_LOC_SEL:
/*
* This register is not handled by TIS so save the locality
* locally
*/
if (TPM_TIS_I2C_IS_VALID_LOCTY(i2cst->data[1])) {
i2cst->loc_sel = i2cst->data[1];
}
break;
default:
/* We handle non-FIFO here */
/* Index 0 is a register. Convert byte stream to uint32_t */
data = i2cst->data[1];
data |= i2cst->data[2] << 8;
data |= i2cst->data[3] << 16;
data |= i2cst->data[4] << 24;
/* Add register specific masking */
switch (i2cst->data[0]) {
case TPM_I2C_REG_INT_ENABLE:
data &= TPM_I2C_INT_ENABLE_MASK;
break;
case TPM_I2C_REG_STS ... TPM_I2C_REG_STS + 3:
/*
* STS register has 4 bytes data.
* As per the specs following writes must be allowed.
* - From base address 1 to 4 bytes are allowed.
* - Single byte write to first or last byte must
* be allowed.
*/
offset = i2cst->data[0] - TPM_I2C_REG_STS;
if (offset > 0) {
sz = 1;
}
data &= (TPM_I2C_STS_WRITE_MASK >> (offset * 8));
break;
}
tpm_tis_write_data(&i2cst->state, i2cst->tis_addr + offset, data,
sz);
break;
}
tpm_tis_i2c_clear_data(i2cst);
}
return;
}
/* Callback from TPM to indicate that response is copied */
static void tpm_tis_i2c_request_completed(TPMIf *ti, int ret)
{
TPMStateI2C *i2cst = TPM_TIS_I2C(ti);
TPMState *s = &i2cst->state;
/* Inform the common code. */
tpm_tis_request_completed(s, ret);
}
static enum TPMVersion tpm_tis_i2c_get_tpm_version(TPMIf *ti)
{
TPMStateI2C *i2cst = TPM_TIS_I2C(ti);
TPMState *s = &i2cst->state;
return tpm_tis_get_tpm_version(s);
}
static int tpm_tis_i2c_event(I2CSlave *i2c, enum i2c_event event)
{
TPMStateI2C *i2cst = TPM_TIS_I2C(i2c);
int ret = 0;
switch (event) {
case I2C_START_RECV:
trace_tpm_tis_i2c_event("START_RECV");
break;
case I2C_START_SEND:
trace_tpm_tis_i2c_event("START_SEND");
tpm_tis_i2c_clear_data(i2cst);
break;
case I2C_FINISH:
trace_tpm_tis_i2c_event("FINISH");
if (i2cst->operation == OP_SEND) {
tpm_tis_i2c_tpm_send(i2cst);
} else {
tpm_tis_i2c_clear_data(i2cst);
}
break;
default:
break;
}
return ret;
}
/*
* If data is for FIFO then it is received from tpm_tis_common buffer
* otherwise it will be handled using single call to common code and
* cached in the local buffer.
*/
static uint8_t tpm_tis_i2c_recv(I2CSlave *i2c)
{
int ret = 0;
uint32_t data_read;
TPMStateI2C *i2cst = TPM_TIS_I2C(i2c);
TPMState *s = &i2cst->state;
uint16_t i2c_reg = i2cst->data[0];
size_t offset;
if (i2cst->operation == OP_RECV) {
/* Do not cache FIFO data. */
if (i2cst->data[0] == TPM_I2C_REG_DATA_FIFO) {
data_read = tpm_tis_read_data(s, i2cst->tis_addr, 1);
ret = (data_read & 0xff);
} else if (i2cst->offset < sizeof(i2cst->data)) {
ret = i2cst->data[i2cst->offset++];
}
} else if ((i2cst->operation == OP_SEND) && (i2cst->offset < 2)) {
/* First receive call after send */
i2cst->operation = OP_RECV;
switch (i2c_reg) {
case TPM_I2C_REG_LOC_SEL:
/* Location selection register is managed by i2c */
tpm_tis_i2c_set_data(i2cst, i2cst->loc_sel);
break;
case TPM_I2C_REG_DATA_FIFO:
/* FIFO data is directly read from TPM TIS */
data_read = tpm_tis_read_data(s, i2cst->tis_addr, 1);
tpm_tis_i2c_set_data(i2cst, (data_read & 0xff));
break;
case TPM_I2C_REG_DATA_CSUM_ENABLE:
tpm_tis_i2c_set_data(i2cst, i2cst->csum_enable);
break;
case TPM_I2C_REG_INT_CAPABILITY:
/*
* Interrupt is not supported in the linux kernel hence we cannot
* test this model with interrupts.
*/
tpm_tis_i2c_set_data(i2cst, TPM_I2C_INT_ENABLE_MASK);
break;
case TPM_I2C_REG_DATA_CSUM_GET:
/*
* Checksum registers are not supported by common code hence
* call a common code to get the checksum.
*/
data_read = tpm_tis_get_checksum(s);
/* Save the byte stream in data field */
tpm_tis_i2c_set_data(i2cst, data_read);
break;
default:
data_read = tpm_tis_read_data(s, i2cst->tis_addr, 4);
switch (i2c_reg) {
case TPM_I2C_REG_INTF_CAPABILITY:
/* Prepare the capabilities as per I2C interface */
data_read = tpm_tis_i2c_interface_capability(i2cst,
data_read);
break;
case TPM_I2C_REG_STS ... TPM_I2C_REG_STS + 3:
offset = i2c_reg - TPM_I2C_REG_STS;
/*
* As per specs, STS bit 31:26 are reserved and must
* be set to 0
*/
data_read &= TPM_I2C_STS_READ_MASK;
/*
* STS register has 4 bytes data.
* As per the specs following reads must be allowed.
* - From base address 1 to 4 bytes are allowed.
* - Last byte must be allowed to read as a single byte
* - Second and third byte must be allowed to read as two
* two bytes.
*/
data_read >>= (offset * 8);
break;
}
/* Save byte stream in data[] */
tpm_tis_i2c_set_data(i2cst, data_read);
break;
}
/* Return first byte with this call */
i2cst->offset = 1; /* keep the register value intact for debug */
ret = i2cst->data[i2cst->offset++];
} else {
i2cst->operation = OP_RECV;
}
trace_tpm_tis_i2c_recv(ret);
return ret;
}
/*
* Send function only remembers data in the buffer and then calls
* TPM TIS common code during FINISH event.
*/
static int tpm_tis_i2c_send(I2CSlave *i2c, uint8_t data)
{
TPMStateI2C *i2cst = TPM_TIS_I2C(i2c);
/* Reject non-supported registers. */
if (i2cst->offset == 0) {
/* Convert I2C register to TIS register */
tpm_tis_i2c_to_tis_reg(i2cst, data);
if (i2cst->tis_addr == 0xffffffff) {
return 0xffffffff;
}
trace_tpm_tis_i2c_send_reg(i2cst->reg_name, data);
/* We do not support device address change */
if (data == TPM_I2C_REG_I2C_DEV_ADDRESS) {
qemu_log_mask(LOG_UNIMP, "%s: Device address change "
"is not supported.\n", __func__);
return 0xffffffff;
}
} else {
trace_tpm_tis_i2c_send(data);
}
if (i2cst->offset < sizeof(i2cst->data)) {
i2cst->operation = OP_SEND;
/*
* In two cases, we save values in the local buffer.
* 1) The first value is always a register.
* 2) In case of non-FIFO multibyte registers, TIS expects full
* register value hence I2C layer cache the register value and send
* to TIS during FINISH event.
*/
if ((i2cst->offset == 0) ||
(i2cst->data[0] != TPM_I2C_REG_DATA_FIFO)) {
i2cst->data[i2cst->offset++] = data;
} else {
/*
* The TIS can process FIFO data one byte at a time hence the FIFO
* data is sent to TIS directly.
*/
tpm_tis_write_data(&i2cst->state, i2cst->tis_addr, data, 1);
}
return 0;
}
/* Return non-zero to indicate NAK */
return 1;
}
static Property tpm_tis_i2c_properties[] = {
DEFINE_PROP_TPMBE("tpmdev", TPMStateI2C, state.be_driver),
DEFINE_PROP_END_OF_LIST(),
};
static void tpm_tis_i2c_realizefn(DeviceState *dev, Error **errp)
{
TPMStateI2C *i2cst = TPM_TIS_I2C(dev);
TPMState *s = &i2cst->state;
if (!tpm_find()) {
error_setg(errp, "at most one TPM device is permitted");
return;
}
/*
* Get the backend pointer. It is not initialized propery during
* device_class_set_props
*/
s->be_driver = qemu_find_tpm_be("tpm0");
if (!s->be_driver) {
error_setg(errp, "'tpmdev' property is required");
return;
}
}
static void tpm_tis_i2c_reset(DeviceState *dev)
{
TPMStateI2C *i2cst = TPM_TIS_I2C(dev);
TPMState *s = &i2cst->state;
tpm_tis_i2c_clear_data(i2cst);
i2cst->csum_enable = 0;
i2cst->loc_sel = 0x00;
return tpm_tis_reset(s);
}
static void tpm_tis_i2c_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);
TPMIfClass *tc = TPM_IF_CLASS(klass);
dc->realize = tpm_tis_i2c_realizefn;
dc->reset = tpm_tis_i2c_reset;
dc->vmsd = &vmstate_tpm_tis_i2c;
device_class_set_props(dc, tpm_tis_i2c_properties);
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
k->event = tpm_tis_i2c_event;
k->recv = tpm_tis_i2c_recv;
k->send = tpm_tis_i2c_send;
tc->model = TPM_MODEL_TPM_TIS;
tc->request_completed = tpm_tis_i2c_request_completed;
tc->get_version = tpm_tis_i2c_get_tpm_version;
}
static const TypeInfo tpm_tis_i2c_info = {
.name = TYPE_TPM_TIS_I2C,
.parent = TYPE_I2C_SLAVE,
.instance_size = sizeof(TPMStateI2C),
.class_init = tpm_tis_i2c_class_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_TPM_IF },
{ }
}
};
static void tpm_tis_i2c_register_types(void)
{
type_register_static(&tpm_tis_i2c_info);
}
type_init(tpm_tis_i2c_register_types)

6
hw/tpm/trace-events
View File

@ -36,3 +36,9 @@ tpm_spapr_do_crq_unknown_msg_type(uint8_t type) "Unknown message type 0x%02x"
tpm_spapr_do_crq_unknown_crq(uint8_t raw1, uint8_t raw2) "unknown CRQ 0x%02x 0x%02x ..."
tpm_spapr_post_load(void) "Delivering TPM response after resume"
tpm_spapr_caught_response(uint32_t v) "Caught response to deliver after resume: %u bytes"
# tpm_tis_i2c.c
tpm_tis_i2c_recv(uint8_t data) "TPM I2C read: 0x%X"
tpm_tis_i2c_send(uint8_t data) "TPM I2C write: 0x%X"
tpm_tis_i2c_event(const char *event) "TPM I2C event: %s"
tpm_tis_i2c_send_reg(const char *name, int reg) "TPM I2C write register: %s(0x%X)"

3
include/sysemu/tpm.h
View File

@ -48,6 +48,7 @@ struct TPMIfClass {
#define TYPE_TPM_TIS_SYSBUS "tpm-tis-device"
#define TYPE_TPM_CRB "tpm-crb"
#define TYPE_TPM_SPAPR "tpm-spapr"
#define TYPE_TPM_TIS_I2C "tpm-tis-i2c"
#define TPM_IS_TIS_ISA(chr) \
object_dynamic_cast(OBJECT(chr), TYPE_TPM_TIS_ISA)
@ -57,6 +58,8 @@ struct TPMIfClass {
object_dynamic_cast(OBJECT(chr), TYPE_TPM_CRB)
#define TPM_IS_SPAPR(chr) \
object_dynamic_cast(OBJECT(chr), TYPE_TPM_SPAPR)
#define TPM_IS_TIS_I2C(chr) \
object_dynamic_cast(OBJECT(chr), TYPE_TPM_TIS_I2C)
/* returns NULL unless there is exactly one TPM device */
static inline TPMIf *tpm_find(void)