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191adc9476
qemu-e2k/hw/tpm/tpm_tis.c
Marc-André Lureau 191adc9476 tpm-be: ask model to the TPM interface 
No need to store the mode in the backend, or to let the frontend set
it itself.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
2017-12-14 23:39:14 -05:00

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/*
* tpm_tis.c - QEMU's TPM TIS interface emulator
*
* Copyright (C) 2006,2010-2013 IBM Corporation
*
* Authors:
* Stefan Berger <stefanb@us.ibm.com>
* David Safford <safford@us.ibm.com>
*
* Xen 4 support: Andrease Niederl <andreas.niederl@iaik.tugraz.at>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
* Implementation of the TIS interface according to specs found at
* http://www.trustedcomputinggroup.org. This implementation currently
* supports version 1.3, 21 March 2013
* In the developers menu choose the PC Client section then find the TIS
* specification.
*
* 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/isa/isa.h"
#include "sysemu/tpm_backend.h"
#include "tpm_int.h"
#include "sysemu/block-backend.h"
#include "exec/address-spaces.h"
#include "hw/hw.h"
#include "hw/i386/pc.h"
#include "hw/pci/pci_ids.h"
#include "qapi/error.h"
#include "qemu-common.h"
#include "qemu/main-loop.h"
#include "hw/acpi/tpm.h"
#define TPM_TIS_NUM_LOCALITIES 5 /* per spec */
#define TPM_TIS_LOCALITY_SHIFT 12
#define TPM_TIS_NO_LOCALITY 0xff
#define TPM_TIS_IS_VALID_LOCTY(x) ((x) < TPM_TIS_NUM_LOCALITIES)
#define TPM_TIS_BUFFER_MAX 4096
typedef enum {
TPM_TIS_STATE_IDLE = 0,
TPM_TIS_STATE_READY,
TPM_TIS_STATE_COMPLETION,
TPM_TIS_STATE_EXECUTION,
TPM_TIS_STATE_RECEPTION,
} TPMTISState;
typedef struct TPMSizedBuffer {
uint32_t size;
uint8_t *buffer;
} TPMSizedBuffer;
/* locality data -- all fields are persisted */
typedef struct TPMLocality {
TPMTISState state;
uint8_t access;
uint32_t sts;
uint32_t iface_id;
uint32_t inte;
uint32_t ints;
uint16_t w_offset;
uint16_t r_offset;
TPMSizedBuffer w_buffer;
TPMSizedBuffer r_buffer;
} TPMLocality;
typedef struct TPMState {
ISADevice busdev;
MemoryRegion mmio;
uint32_t offset;
uint8_t buf[TPM_TIS_BUFFER_MAX];
uint8_t active_locty;
uint8_t aborting_locty;
uint8_t next_locty;
TPMLocality loc[TPM_TIS_NUM_LOCALITIES];
qemu_irq irq;
uint32_t irq_num;
TPMBackendCmd cmd;
char *backend;
TPMBackend *be_driver;
TPMVersion be_tpm_version;
} TPMState;
#define TPM(obj) OBJECT_CHECK(TPMState, (obj), TYPE_TPM_TIS)
#define DEBUG_TIS 0
#define DPRINTF(fmt, ...) do { \
if (DEBUG_TIS) { \
printf(fmt, ## __VA_ARGS__); \
} \
} while (0);
/* tis registers */
#define TPM_TIS_REG_ACCESS 0x00
#define TPM_TIS_REG_INT_ENABLE 0x08
#define TPM_TIS_REG_INT_VECTOR 0x0c
#define TPM_TIS_REG_INT_STATUS 0x10
#define TPM_TIS_REG_INTF_CAPABILITY 0x14
#define TPM_TIS_REG_STS 0x18
#define TPM_TIS_REG_DATA_FIFO 0x24
#define TPM_TIS_REG_INTERFACE_ID 0x30
#define TPM_TIS_REG_DATA_XFIFO 0x80
#define TPM_TIS_REG_DATA_XFIFO_END 0xbc
#define TPM_TIS_REG_DID_VID 0xf00
#define TPM_TIS_REG_RID 0xf04
/* vendor-specific registers */
#define TPM_TIS_REG_DEBUG 0xf90
#define TPM_TIS_STS_TPM_FAMILY_MASK (0x3 << 26)/* TPM 2.0 */
#define TPM_TIS_STS_TPM_FAMILY1_2 (0 << 26) /* TPM 2.0 */
#define TPM_TIS_STS_TPM_FAMILY2_0 (1 << 26) /* TPM 2.0 */
#define TPM_TIS_STS_RESET_ESTABLISHMENT_BIT (1 << 25) /* TPM 2.0 */
#define TPM_TIS_STS_COMMAND_CANCEL (1 << 24) /* TPM 2.0 */
#define TPM_TIS_STS_VALID (1 << 7)
#define TPM_TIS_STS_COMMAND_READY (1 << 6)
#define TPM_TIS_STS_TPM_GO (1 << 5)
#define TPM_TIS_STS_DATA_AVAILABLE (1 << 4)
#define TPM_TIS_STS_EXPECT (1 << 3)
#define TPM_TIS_STS_SELFTEST_DONE (1 << 2)
#define TPM_TIS_STS_RESPONSE_RETRY (1 << 1)
#define TPM_TIS_BURST_COUNT_SHIFT 8
#define TPM_TIS_BURST_COUNT(X) \
((X) << TPM_TIS_BURST_COUNT_SHIFT)
#define TPM_TIS_ACCESS_TPM_REG_VALID_STS (1 << 7)
#define TPM_TIS_ACCESS_ACTIVE_LOCALITY (1 << 5)
#define TPM_TIS_ACCESS_BEEN_SEIZED (1 << 4)
#define TPM_TIS_ACCESS_SEIZE (1 << 3)
#define TPM_TIS_ACCESS_PENDING_REQUEST (1 << 2)
#define TPM_TIS_ACCESS_REQUEST_USE (1 << 1)
#define TPM_TIS_ACCESS_TPM_ESTABLISHMENT (1 << 0)
#define TPM_TIS_INT_ENABLED (1 << 31)
#define TPM_TIS_INT_DATA_AVAILABLE (1 << 0)
#define TPM_TIS_INT_STS_VALID (1 << 1)
#define TPM_TIS_INT_LOCALITY_CHANGED (1 << 2)
#define TPM_TIS_INT_COMMAND_READY (1 << 7)
#define TPM_TIS_INT_POLARITY_MASK (3 << 3)
#define TPM_TIS_INT_POLARITY_LOW_LEVEL (1 << 3)
#define TPM_TIS_INTERRUPTS_SUPPORTED (TPM_TIS_INT_LOCALITY_CHANGED | \
TPM_TIS_INT_DATA_AVAILABLE | \
TPM_TIS_INT_STS_VALID | \
TPM_TIS_INT_COMMAND_READY)
#define TPM_TIS_CAP_INTERFACE_VERSION1_3 (2 << 28)
#define TPM_TIS_CAP_INTERFACE_VERSION1_3_FOR_TPM2_0 (3 << 28)
#define TPM_TIS_CAP_DATA_TRANSFER_64B (3 << 9)
#define TPM_TIS_CAP_DATA_TRANSFER_LEGACY (0 << 9)
#define TPM_TIS_CAP_BURST_COUNT_DYNAMIC (0 << 8)
#define TPM_TIS_CAP_INTERRUPT_LOW_LEVEL (1 << 4) /* support is mandatory */
#define TPM_TIS_CAPABILITIES_SUPPORTED1_3 \
(TPM_TIS_CAP_INTERRUPT_LOW_LEVEL | \
TPM_TIS_CAP_BURST_COUNT_DYNAMIC | \
TPM_TIS_CAP_DATA_TRANSFER_64B | \
TPM_TIS_CAP_INTERFACE_VERSION1_3 | \
TPM_TIS_INTERRUPTS_SUPPORTED)
#define TPM_TIS_CAPABILITIES_SUPPORTED2_0 \
(TPM_TIS_CAP_INTERRUPT_LOW_LEVEL | \
TPM_TIS_CAP_BURST_COUNT_DYNAMIC | \
TPM_TIS_CAP_DATA_TRANSFER_64B | \
TPM_TIS_CAP_INTERFACE_VERSION1_3_FOR_TPM2_0 | \
TPM_TIS_INTERRUPTS_SUPPORTED)
#define TPM_TIS_IFACE_ID_INTERFACE_TIS1_3 (0xf) /* TPM 2.0 */
#define TPM_TIS_IFACE_ID_INTERFACE_FIFO (0x0) /* TPM 2.0 */
#define TPM_TIS_IFACE_ID_INTERFACE_VER_FIFO (0 << 4) /* TPM 2.0 */
#define TPM_TIS_IFACE_ID_CAP_5_LOCALITIES (1 << 8) /* TPM 2.0 */
#define TPM_TIS_IFACE_ID_CAP_TIS_SUPPORTED (1 << 13) /* TPM 2.0 */
#define TPM_TIS_IFACE_ID_INT_SEL_LOCK (1 << 19) /* TPM 2.0 */
#define TPM_TIS_IFACE_ID_SUPPORTED_FLAGS1_3 \
(TPM_TIS_IFACE_ID_INTERFACE_TIS1_3 | \
(~0u << 4)/* all of it is don't care */)
/* if backend was a TPM 2.0: */
#define TPM_TIS_IFACE_ID_SUPPORTED_FLAGS2_0 \
(TPM_TIS_IFACE_ID_INTERFACE_FIFO | \
TPM_TIS_IFACE_ID_INTERFACE_VER_FIFO | \
TPM_TIS_IFACE_ID_CAP_5_LOCALITIES | \
TPM_TIS_IFACE_ID_CAP_TIS_SUPPORTED)
#define TPM_TIS_TPM_DID 0x0001
#define TPM_TIS_TPM_VID PCI_VENDOR_ID_IBM
#define TPM_TIS_TPM_RID 0x0001
#define TPM_TIS_NO_DATA_BYTE 0xff
/* local prototypes */
static uint64_t tpm_tis_mmio_read(void *opaque, hwaddr addr,
unsigned size);
/* utility functions */
static uint8_t tpm_tis_locality_from_addr(hwaddr addr)
{
return (uint8_t)((addr >> TPM_TIS_LOCALITY_SHIFT) & 0x7);
}
static uint32_t tpm_tis_get_size_from_buffer(const TPMSizedBuffer *sb)
{
return be32_to_cpu(*(uint32_t *)&sb->buffer[2]);
}
static void tpm_tis_show_buffer(const TPMSizedBuffer *sb, const char *string)
{
#ifdef DEBUG_TIS
uint32_t len, i;
len = tpm_tis_get_size_from_buffer(sb);
DPRINTF("tpm_tis: %s length = %d\n", string, len);
for (i = 0; i < len; i++) {
if (i && !(i % 16)) {
DPRINTF("\n");
}
DPRINTF("%.2X ", sb->buffer[i]);
}
DPRINTF("\n");
#endif
}
/*
* Set the given flags in the STS register by clearing the register but
* preserving the SELFTEST_DONE and TPM_FAMILY_MASK flags and then setting
* the new flags.
*
* The SELFTEST_DONE flag is acquired from the backend that determines it by
* peeking into TPM commands.
*
* A VM suspend/resume will preserve the flag by storing it into the VM
* device state, but the backend will not remember it when QEMU is started
* again. Therefore, we cache the flag here. Once set, it will not be unset
* except by a reset.
*/
static void tpm_tis_sts_set(TPMLocality *l, uint32_t flags)
{
l->sts &= TPM_TIS_STS_SELFTEST_DONE | TPM_TIS_STS_TPM_FAMILY_MASK;
l->sts |= flags;
}
/*
* Send a request to the TPM.
*/
static void tpm_tis_tpm_send(TPMState *s, uint8_t locty)
{
TPMLocality *locty_data = &s->loc[locty];
tpm_tis_show_buffer(&s->loc[locty].w_buffer, "tpm_tis: To TPM");
/*
* w_offset serves as length indicator for length of data;
* it's reset when the response comes back
*/
s->loc[locty].state = TPM_TIS_STATE_EXECUTION;
s->cmd = (TPMBackendCmd) {
.locty = locty,
.in = locty_data->w_buffer.buffer,
.in_len = locty_data->w_offset,
.out = locty_data->r_buffer.buffer,
.out_len = locty_data->r_buffer.size
};
tpm_backend_deliver_request(s->be_driver, &s->cmd);
}
/* raise an interrupt if allowed */
static void tpm_tis_raise_irq(TPMState *s, uint8_t locty, uint32_t irqmask)
{
if (!TPM_TIS_IS_VALID_LOCTY(locty)) {
return;
}
if ((s->loc[locty].inte & TPM_TIS_INT_ENABLED) &&
(s->loc[locty].inte & irqmask)) {
DPRINTF("tpm_tis: Raising IRQ for flag %08x\n", irqmask);
qemu_irq_raise(s->irq);
s->loc[locty].ints |= irqmask;
}
}
static uint32_t tpm_tis_check_request_use_except(TPMState *s, uint8_t locty)
{
uint8_t l;
for (l = 0; l < TPM_TIS_NUM_LOCALITIES; l++) {
if (l == locty) {
continue;
}
if ((s->loc[l].access & TPM_TIS_ACCESS_REQUEST_USE)) {
return 1;
}
}
return 0;
}
static void tpm_tis_new_active_locality(TPMState *s, uint8_t new_active_locty)
{
bool change = (s->active_locty != new_active_locty);
bool is_seize;
uint8_t mask;
if (change && TPM_TIS_IS_VALID_LOCTY(s->active_locty)) {
is_seize = TPM_TIS_IS_VALID_LOCTY(new_active_locty) &&
s->loc[new_active_locty].access & TPM_TIS_ACCESS_SEIZE;
if (is_seize) {
mask = ~(TPM_TIS_ACCESS_ACTIVE_LOCALITY);
} else {
mask = ~(TPM_TIS_ACCESS_ACTIVE_LOCALITY|
TPM_TIS_ACCESS_REQUEST_USE);
}
/* reset flags on the old active locality */
s->loc[s->active_locty].access &= mask;
if (is_seize) {
s->loc[s->active_locty].access |= TPM_TIS_ACCESS_BEEN_SEIZED;
}
}
s->active_locty = new_active_locty;
DPRINTF("tpm_tis: Active locality is now %d\n", s->active_locty);
if (TPM_TIS_IS_VALID_LOCTY(new_active_locty)) {
/* set flags on the new active locality */
s->loc[new_active_locty].access |= TPM_TIS_ACCESS_ACTIVE_LOCALITY;
s->loc[new_active_locty].access &= ~(TPM_TIS_ACCESS_REQUEST_USE |
TPM_TIS_ACCESS_SEIZE);
}
if (change) {
tpm_tis_raise_irq(s, s->active_locty, TPM_TIS_INT_LOCALITY_CHANGED);
}
}
/* abort -- this function switches the locality */
static void tpm_tis_abort(TPMState *s, uint8_t locty)
{
s->loc[locty].r_offset = 0;
s->loc[locty].w_offset = 0;
DPRINTF("tpm_tis: tis_abort: new active locality is %d\n", s->next_locty);
/*
* Need to react differently depending on who's aborting now and
* which locality will become active afterwards.
*/
if (s->aborting_locty == s->next_locty) {
s->loc[s->aborting_locty].state = TPM_TIS_STATE_READY;
tpm_tis_sts_set(&s->loc[s->aborting_locty],
TPM_TIS_STS_COMMAND_READY);
tpm_tis_raise_irq(s, s->aborting_locty, TPM_TIS_INT_COMMAND_READY);
}
/* locality after abort is another one than the current one */
tpm_tis_new_active_locality(s, s->next_locty);
s->next_locty = TPM_TIS_NO_LOCALITY;
/* nobody's aborting a command anymore */
s->aborting_locty = TPM_TIS_NO_LOCALITY;
}
/* prepare aborting current command */
static void tpm_tis_prep_abort(TPMState *s, uint8_t locty, uint8_t newlocty)
{
uint8_t busy_locty;
s->aborting_locty = locty;
s->next_locty = newlocty; /* locality after successful abort */
/*
* only abort a command using an interrupt if currently executing
* a command AND if there's a valid connection to the vTPM.
*/
for (busy_locty = 0; busy_locty < TPM_TIS_NUM_LOCALITIES; busy_locty++) {
if (s->loc[busy_locty].state == TPM_TIS_STATE_EXECUTION) {
/*
* request the backend to cancel. Some backends may not
* support it
*/
tpm_backend_cancel_cmd(s->be_driver);
return;
}
}
tpm_tis_abort(s, locty);
}
/*
* Callback from the TPM to indicate that the response was received.
*/
static void tpm_tis_request_completed(TPMIf *ti)
{
TPMState *s = TPM(ti);
uint8_t locty = s->cmd.locty;
uint8_t l;
if (s->cmd.selftest_done) {
for (l = 0; l < TPM_TIS_NUM_LOCALITIES; l++) {
s->loc[locty].sts |= TPM_TIS_STS_SELFTEST_DONE;
}
}
tpm_tis_sts_set(&s->loc[locty],
TPM_TIS_STS_VALID | TPM_TIS_STS_DATA_AVAILABLE);
s->loc[locty].state = TPM_TIS_STATE_COMPLETION;
s->loc[locty].r_offset = 0;
s->loc[locty].w_offset = 0;
tpm_tis_show_buffer(&s->loc[locty].r_buffer, "tpm_tis: From TPM");
if (TPM_TIS_IS_VALID_LOCTY(s->next_locty)) {
tpm_tis_abort(s, locty);
}
tpm_tis_raise_irq(s, locty,
TPM_TIS_INT_DATA_AVAILABLE | TPM_TIS_INT_STS_VALID);
}
/*
* Read a byte of response data
*/
static uint32_t tpm_tis_data_read(TPMState *s, uint8_t locty)
{
uint32_t ret = TPM_TIS_NO_DATA_BYTE;
uint16_t len;
if ((s->loc[locty].sts & TPM_TIS_STS_DATA_AVAILABLE)) {
len = tpm_tis_get_size_from_buffer(&s->loc[locty].r_buffer);
ret = s->loc[locty].r_buffer.buffer[s->loc[locty].r_offset++];
if (s->loc[locty].r_offset >= len) {
/* got last byte */
tpm_tis_sts_set(&s->loc[locty], TPM_TIS_STS_VALID);
tpm_tis_raise_irq(s, locty, TPM_TIS_INT_STS_VALID);
}
DPRINTF("tpm_tis: tpm_tis_data_read byte 0x%02x [%d]\n",
ret, s->loc[locty].r_offset - 1);
}
return ret;
}
#ifdef DEBUG_TIS
static void tpm_tis_dump_state(void *opaque, hwaddr addr)
{
static const unsigned regs[] = {
TPM_TIS_REG_ACCESS,
TPM_TIS_REG_INT_ENABLE,
TPM_TIS_REG_INT_VECTOR,
TPM_TIS_REG_INT_STATUS,
TPM_TIS_REG_INTF_CAPABILITY,
TPM_TIS_REG_STS,
TPM_TIS_REG_DID_VID,
TPM_TIS_REG_RID,
0xfff};
int idx;
uint8_t locty = tpm_tis_locality_from_addr(addr);
hwaddr base = addr & ~0xfff;
TPMState *s = opaque;
DPRINTF("tpm_tis: active locality : %d\n"
"tpm_tis: state of locality %d : %d\n"
"tpm_tis: register dump:\n",
s->active_locty,
locty, s->loc[locty].state);
for (idx = 0; regs[idx] != 0xfff; idx++) {
DPRINTF("tpm_tis: 0x%04x : 0x%08x\n", regs[idx],
(int)tpm_tis_mmio_read(opaque, base + regs[idx], 4));
}
DPRINTF("tpm_tis: read offset : %d\n"
"tpm_tis: result buffer : ",
s->loc[locty].r_offset);
for (idx = 0;
idx < tpm_tis_get_size_from_buffer(&s->loc[locty].r_buffer);
idx++) {
DPRINTF("%c%02x%s",
s->loc[locty].r_offset == idx ? '>' : ' ',
s->loc[locty].r_buffer.buffer[idx],
((idx & 0xf) == 0xf) ? "\ntpm_tis: " : "");
}
DPRINTF("\n"
"tpm_tis: write offset : %d\n"
"tpm_tis: request buffer: ",
s->loc[locty].w_offset);
for (idx = 0;
idx < tpm_tis_get_size_from_buffer(&s->loc[locty].w_buffer);
idx++) {
DPRINTF("%c%02x%s",
s->loc[locty].w_offset == idx ? '>' : ' ',
s->loc[locty].w_buffer.buffer[idx],
((idx & 0xf) == 0xf) ? "\ntpm_tis: " : "");
}
DPRINTF("\n");
}
#endif
/*
* Read a register of the TIS interface
* See specs pages 33-63 for description of the registers
*/
static uint64_t tpm_tis_mmio_read(void *opaque, hwaddr addr,
unsigned size)
{
TPMState *s = opaque;
uint16_t offset = addr & 0xffc;
uint8_t shift = (addr & 0x3) * 8;
uint32_t val = 0xffffffff;
uint8_t locty = tpm_tis_locality_from_addr(addr);
uint32_t avail;
uint8_t v;
if (tpm_backend_had_startup_error(s->be_driver)) {
return 0;
}
switch (offset) {
case TPM_TIS_REG_ACCESS:
/* never show the SEIZE flag even though we use it internally */
val = s->loc[locty].access & ~TPM_TIS_ACCESS_SEIZE;
/* the pending flag is always calculated */
if (tpm_tis_check_request_use_except(s, locty)) {
val |= TPM_TIS_ACCESS_PENDING_REQUEST;
}
val |= !tpm_backend_get_tpm_established_flag(s->be_driver);
break;
case TPM_TIS_REG_INT_ENABLE:
val = s->loc[locty].inte;
break;
case TPM_TIS_REG_INT_VECTOR:
val = s->irq_num;
break;
case TPM_TIS_REG_INT_STATUS:
val = s->loc[locty].ints;
break;
case TPM_TIS_REG_INTF_CAPABILITY:
switch (s->be_tpm_version) {
case TPM_VERSION_UNSPEC:
val = 0;
break;
case TPM_VERSION_1_2:
val = TPM_TIS_CAPABILITIES_SUPPORTED1_3;
break;
case TPM_VERSION_2_0:
val = TPM_TIS_CAPABILITIES_SUPPORTED2_0;
break;
}
break;
case TPM_TIS_REG_STS:
if (s->active_locty == locty) {
if ((s->loc[locty].sts & TPM_TIS_STS_DATA_AVAILABLE)) {
val = TPM_TIS_BURST_COUNT(
tpm_tis_get_size_from_buffer(&s->loc[locty].r_buffer)
- s->loc[locty].r_offset) | s->loc[locty].sts;
} else {
avail = s->loc[locty].w_buffer.size
- s->loc[locty].w_offset;
/*
* byte-sized reads should not return 0x00 for 0x100
* available bytes.
*/
if (size == 1 && avail > 0xff) {
avail = 0xff;
}
val = TPM_TIS_BURST_COUNT(avail) | s->loc[locty].sts;
}
}
break;
case TPM_TIS_REG_DATA_FIFO:
case TPM_TIS_REG_DATA_XFIFO ... TPM_TIS_REG_DATA_XFIFO_END:
if (s->active_locty == locty) {
if (size > 4 - (addr & 0x3)) {
/* prevent access beyond FIFO */
size = 4 - (addr & 0x3);
}
val = 0;
shift = 0;
while (size > 0) {
switch (s->loc[locty].state) {
case TPM_TIS_STATE_COMPLETION:
v = tpm_tis_data_read(s, locty);
break;
default:
v = TPM_TIS_NO_DATA_BYTE;
break;
}
val |= (v << shift);
shift += 8;
size--;
}
shift = 0; /* no more adjustments */
}
break;
case TPM_TIS_REG_INTERFACE_ID:
val = s->loc[locty].iface_id;
break;
case TPM_TIS_REG_DID_VID:
val = (TPM_TIS_TPM_DID << 16) | TPM_TIS_TPM_VID;
break;
case TPM_TIS_REG_RID:
val = TPM_TIS_TPM_RID;
break;
#ifdef DEBUG_TIS
case TPM_TIS_REG_DEBUG:
tpm_tis_dump_state(opaque, addr);
break;
#endif
}
if (shift) {
val >>= shift;
}
DPRINTF("tpm_tis: read.%u(%08x) = %08x\n", size, (int)addr, (int)val);
return val;
}
/*
* Write a value to a register of the TIS interface
* See specs pages 33-63 for description of the registers
*/
static void tpm_tis_mmio_write(void *opaque, hwaddr addr,
uint64_t val, unsigned size)
{
TPMState *s = opaque;
uint16_t off = addr & 0xffc;
uint8_t shift = (addr & 0x3) * 8;
uint8_t locty = tpm_tis_locality_from_addr(addr);
uint8_t active_locty, l;
int c, set_new_locty = 1;
uint16_t len;
uint32_t mask = (size == 1) ? 0xff : ((size == 2) ? 0xffff : ~0);
DPRINTF("tpm_tis: write.%u(%08x) = %08x\n", size, (int)addr, (int)val);
if (locty == 4) {
DPRINTF("tpm_tis: Access to locality 4 only allowed from hardware\n");
return;
}
if (tpm_backend_had_startup_error(s->be_driver)) {
return;
}
val &= mask;
if (shift) {
val <<= shift;
mask <<= shift;
}
mask ^= 0xffffffff;
switch (off) {
case TPM_TIS_REG_ACCESS:
if ((val & TPM_TIS_ACCESS_SEIZE)) {
val &= ~(TPM_TIS_ACCESS_REQUEST_USE |
TPM_TIS_ACCESS_ACTIVE_LOCALITY);
}
active_locty = s->active_locty;
if ((val & TPM_TIS_ACCESS_ACTIVE_LOCALITY)) {
/* give up locality if currently owned */
if (s->active_locty == locty) {
DPRINTF("tpm_tis: Releasing locality %d\n", locty);
uint8_t newlocty = TPM_TIS_NO_LOCALITY;
/* anybody wants the locality ? */
for (c = TPM_TIS_NUM_LOCALITIES - 1; c >= 0; c--) {
if ((s->loc[c].access & TPM_TIS_ACCESS_REQUEST_USE)) {
DPRINTF("tpm_tis: Locality %d requests use.\n", c);
newlocty = c;
break;
}
}
DPRINTF("tpm_tis: TPM_TIS_ACCESS_ACTIVE_LOCALITY: "
"Next active locality: %d\n",
newlocty);
if (TPM_TIS_IS_VALID_LOCTY(newlocty)) {
set_new_locty = 0;
tpm_tis_prep_abort(s, locty, newlocty);
} else {
active_locty = TPM_TIS_NO_LOCALITY;
}
} else {
/* not currently the owner; clear a pending request */
s->loc[locty].access &= ~TPM_TIS_ACCESS_REQUEST_USE;
}
}
if ((val & TPM_TIS_ACCESS_BEEN_SEIZED)) {
s->loc[locty].access &= ~TPM_TIS_ACCESS_BEEN_SEIZED;
}
if ((val & TPM_TIS_ACCESS_SEIZE)) {
/*
* allow seize if a locality is active and the requesting
* locality is higher than the one that's active
* OR
* allow seize for requesting locality if no locality is
* active
*/
while ((TPM_TIS_IS_VALID_LOCTY(s->active_locty) &&
locty > s->active_locty) ||
!TPM_TIS_IS_VALID_LOCTY(s->active_locty)) {
bool higher_seize = FALSE;
/* already a pending SEIZE ? */
if ((s->loc[locty].access & TPM_TIS_ACCESS_SEIZE)) {
break;
}
/* check for ongoing seize by a higher locality */
for (l = locty + 1; l < TPM_TIS_NUM_LOCALITIES; l++) {
if ((s->loc[l].access & TPM_TIS_ACCESS_SEIZE)) {
higher_seize = TRUE;
break;
}
}
if (higher_seize) {
break;
}
/* cancel any seize by a lower locality */
for (l = 0; l < locty - 1; l++) {
s->loc[l].access &= ~TPM_TIS_ACCESS_SEIZE;
}
s->loc[locty].access |= TPM_TIS_ACCESS_SEIZE;
DPRINTF("tpm_tis: TPM_TIS_ACCESS_SEIZE: "
"Locality %d seized from locality %d\n",
locty, s->active_locty);
DPRINTF("tpm_tis: TPM_TIS_ACCESS_SEIZE: Initiating abort.\n");
set_new_locty = 0;
tpm_tis_prep_abort(s, s->active_locty, locty);
break;
}
}
if ((val & TPM_TIS_ACCESS_REQUEST_USE)) {
if (s->active_locty != locty) {
if (TPM_TIS_IS_VALID_LOCTY(s->active_locty)) {
s->loc[locty].access |= TPM_TIS_ACCESS_REQUEST_USE;
} else {
/* no locality active -> make this one active now */
active_locty = locty;
}
}
}
if (set_new_locty) {
tpm_tis_new_active_locality(s, active_locty);
}
break;
case TPM_TIS_REG_INT_ENABLE:
if (s->active_locty != locty) {
break;
}
s->loc[locty].inte &= mask;
s->loc[locty].inte |= (val & (TPM_TIS_INT_ENABLED |
TPM_TIS_INT_POLARITY_MASK |
TPM_TIS_INTERRUPTS_SUPPORTED));
break;
case TPM_TIS_REG_INT_VECTOR:
/* hard wired -- ignore */
break;
case TPM_TIS_REG_INT_STATUS:
if (s->active_locty != locty) {
break;
}
/* clearing of interrupt flags */
if (((val & TPM_TIS_INTERRUPTS_SUPPORTED)) &&
(s->loc[locty].ints & TPM_TIS_INTERRUPTS_SUPPORTED)) {
s->loc[locty].ints &= ~val;
if (s->loc[locty].ints == 0) {
qemu_irq_lower(s->irq);
DPRINTF("tpm_tis: Lowering IRQ\n");
}
}
s->loc[locty].ints &= ~(val & TPM_TIS_INTERRUPTS_SUPPORTED);
break;
case TPM_TIS_REG_STS:
if (s->active_locty != locty) {
break;
}
if (s->be_tpm_version == TPM_VERSION_2_0) {
/* some flags that are only supported for TPM 2 */
if (val & TPM_TIS_STS_COMMAND_CANCEL) {
if (s->loc[locty].state == TPM_TIS_STATE_EXECUTION) {
/*
* request the backend to cancel. Some backends may not
* support it
*/
tpm_backend_cancel_cmd(s->be_driver);
}
}
if (val & TPM_TIS_STS_RESET_ESTABLISHMENT_BIT) {
if (locty == 3 || locty == 4) {
tpm_backend_reset_tpm_established_flag(s->be_driver, locty);
}
}
}
val &= (TPM_TIS_STS_COMMAND_READY | TPM_TIS_STS_TPM_GO |
TPM_TIS_STS_RESPONSE_RETRY);
if (val == TPM_TIS_STS_COMMAND_READY) {
switch (s->loc[locty].state) {
case TPM_TIS_STATE_READY:
s->loc[locty].w_offset = 0;
s->loc[locty].r_offset = 0;
break;
case TPM_TIS_STATE_IDLE:
tpm_tis_sts_set(&s->loc[locty], TPM_TIS_STS_COMMAND_READY);
s->loc[locty].state = TPM_TIS_STATE_READY;
tpm_tis_raise_irq(s, locty, TPM_TIS_INT_COMMAND_READY);
break;
case TPM_TIS_STATE_EXECUTION:
case TPM_TIS_STATE_RECEPTION:
/* abort currently running command */
DPRINTF("tpm_tis: %s: Initiating abort.\n",
__func__);
tpm_tis_prep_abort(s, locty, locty);
break;
case TPM_TIS_STATE_COMPLETION:
s->loc[locty].w_offset = 0;
s->loc[locty].r_offset = 0;
/* shortcut to ready state with C/R set */
s->loc[locty].state = TPM_TIS_STATE_READY;
if (!(s->loc[locty].sts & TPM_TIS_STS_COMMAND_READY)) {
tpm_tis_sts_set(&s->loc[locty],
TPM_TIS_STS_COMMAND_READY);
tpm_tis_raise_irq(s, locty, TPM_TIS_INT_COMMAND_READY);
}
s->loc[locty].sts &= ~(TPM_TIS_STS_DATA_AVAILABLE);
break;
}
} else if (val == TPM_TIS_STS_TPM_GO) {
switch (s->loc[locty].state) {
case TPM_TIS_STATE_RECEPTION:
if ((s->loc[locty].sts & TPM_TIS_STS_EXPECT) == 0) {
tpm_tis_tpm_send(s, locty);
}
break;
default:
/* ignore */
break;
}
} else if (val == TPM_TIS_STS_RESPONSE_RETRY) {
switch (s->loc[locty].state) {
case TPM_TIS_STATE_COMPLETION:
s->loc[locty].r_offset = 0;
tpm_tis_sts_set(&s->loc[locty],
TPM_TIS_STS_VALID|
TPM_TIS_STS_DATA_AVAILABLE);
break;
default:
/* ignore */
break;
}
}
break;
case TPM_TIS_REG_DATA_FIFO:
case TPM_TIS_REG_DATA_XFIFO ... TPM_TIS_REG_DATA_XFIFO_END:
/* data fifo */
if (s->active_locty != locty) {
break;
}
if (s->loc[locty].state == TPM_TIS_STATE_IDLE ||
s->loc[locty].state == TPM_TIS_STATE_EXECUTION ||
s->loc[locty].state == TPM_TIS_STATE_COMPLETION) {
/* drop the byte */
} else {
DPRINTF("tpm_tis: Data to send to TPM: %08x (size=%d)\n",
(int)val, size);
if (s->loc[locty].state == TPM_TIS_STATE_READY) {
s->loc[locty].state = TPM_TIS_STATE_RECEPTION;
tpm_tis_sts_set(&s->loc[locty],
TPM_TIS_STS_EXPECT | TPM_TIS_STS_VALID);
}
val >>= shift;
if (size > 4 - (addr & 0x3)) {
/* prevent access beyond FIFO */
size = 4 - (addr & 0x3);
}
while ((s->loc[locty].sts & TPM_TIS_STS_EXPECT) && size > 0) {
if (s->loc[locty].w_offset < s->loc[locty].w_buffer.size) {
s->loc[locty].w_buffer.
buffer[s->loc[locty].w_offset++] = (uint8_t)val;
val >>= 8;
size--;
} else {
tpm_tis_sts_set(&s->loc[locty], TPM_TIS_STS_VALID);
}
}
/* check for complete packet */
if (s->loc[locty].w_offset > 5 &&
(s->loc[locty].sts & TPM_TIS_STS_EXPECT)) {
/* we have a packet length - see if we have all of it */
bool need_irq = !(s->loc[locty].sts & TPM_TIS_STS_VALID);
len = tpm_tis_get_size_from_buffer(&s->loc[locty].w_buffer);
if (len > s->loc[locty].w_offset) {
tpm_tis_sts_set(&s->loc[locty],
TPM_TIS_STS_EXPECT | TPM_TIS_STS_VALID);
} else {
/* packet complete */
tpm_tis_sts_set(&s->loc[locty], TPM_TIS_STS_VALID);
}
if (need_irq) {
tpm_tis_raise_irq(s, locty, TPM_TIS_INT_STS_VALID);
}
}
}
break;
case TPM_TIS_REG_INTERFACE_ID:
if (val & TPM_TIS_IFACE_ID_INT_SEL_LOCK) {
for (l = 0; l < TPM_TIS_NUM_LOCALITIES; l++) {
s->loc[l].iface_id |= TPM_TIS_IFACE_ID_INT_SEL_LOCK;
}
}
break;
}
}
static const MemoryRegionOps tpm_tis_memory_ops = {
.read = tpm_tis_mmio_read,
.write = tpm_tis_mmio_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.valid = {
.min_access_size = 1,
.max_access_size = 4,
},
};
static int tpm_tis_do_startup_tpm(TPMState *s)
{
return tpm_backend_startup_tpm(s->be_driver);
}
static void tpm_tis_realloc_buffer(TPMSizedBuffer *sb)
{
size_t wanted_size = 4096; /* Linux tpm.c buffer size */
if (sb->size != wanted_size) {
sb->buffer = g_realloc(sb->buffer, wanted_size);
sb->size = wanted_size;
}
}
/*
* Get the TPMVersion of the backend device being used
*/
TPMVersion tpm_tis_get_tpm_version(Object *obj)
{
TPMState *s = TPM(obj);
if (tpm_backend_had_startup_error(s->be_driver)) {
return TPM_VERSION_UNSPEC;
}
return tpm_backend_get_tpm_version(s->be_driver);
}
/*
* This function is called when the machine starts, resets or due to
* S3 resume.
*/
static void tpm_tis_reset(DeviceState *dev)
{
TPMState *s = TPM(dev);
int c;
s->be_tpm_version = tpm_backend_get_tpm_version(s->be_driver);
tpm_backend_reset(s->be_driver);
s->active_locty = TPM_TIS_NO_LOCALITY;
s->next_locty = TPM_TIS_NO_LOCALITY;
s->aborting_locty = TPM_TIS_NO_LOCALITY;
for (c = 0; c < TPM_TIS_NUM_LOCALITIES; c++) {
s->loc[c].access = TPM_TIS_ACCESS_TPM_REG_VALID_STS;
switch (s->be_tpm_version) {
case TPM_VERSION_UNSPEC:
break;
case TPM_VERSION_1_2:
s->loc[c].sts = TPM_TIS_STS_TPM_FAMILY1_2;
s->loc[c].iface_id = TPM_TIS_IFACE_ID_SUPPORTED_FLAGS1_3;
break;
case TPM_VERSION_2_0:
s->loc[c].sts = TPM_TIS_STS_TPM_FAMILY2_0;
s->loc[c].iface_id = TPM_TIS_IFACE_ID_SUPPORTED_FLAGS2_0;
break;
}
s->loc[c].inte = TPM_TIS_INT_POLARITY_LOW_LEVEL;
s->loc[c].ints = 0;
s->loc[c].state = TPM_TIS_STATE_IDLE;
s->loc[c].w_offset = 0;
tpm_tis_realloc_buffer(&s->loc[c].w_buffer);
s->loc[c].r_offset = 0;
tpm_tis_realloc_buffer(&s->loc[c].r_buffer);
}
tpm_tis_do_startup_tpm(s);
}
static const VMStateDescription vmstate_tpm_tis = {
.name = "tpm",
.unmigratable = 1,
};
static Property tpm_tis_properties[] = {
DEFINE_PROP_UINT32("irq", TPMState, irq_num, TPM_TIS_IRQ),
DEFINE_PROP_STRING("tpmdev", TPMState, backend),
DEFINE_PROP_END_OF_LIST(),
};
static void tpm_tis_realizefn(DeviceState *dev, Error **errp)
{
TPMState *s = TPM(dev);
s->be_driver = qemu_find_tpm(s->backend);
if (!s->be_driver) {
error_setg(errp, "tpm_tis: backend driver with id %s could not be "
"found", s->backend);
return;
}
if (tpm_backend_init(s->be_driver, TPM_IF(s), errp)) {
return;
}
if (s->irq_num > 15) {
error_setg(errp, "tpm_tis: IRQ %d for TPM TIS is outside valid range "
"of 0 to 15", s->irq_num);
return;
}
isa_init_irq(&s->busdev, &s->irq, s->irq_num);
memory_region_add_subregion(isa_address_space(ISA_DEVICE(dev)),
TPM_TIS_ADDR_BASE, &s->mmio);
}
static void tpm_tis_initfn(Object *obj)
{
TPMState *s = TPM(obj);
memory_region_init_io(&s->mmio, OBJECT(s), &tpm_tis_memory_ops,
s, "tpm-tis-mmio",
TPM_TIS_NUM_LOCALITIES << TPM_TIS_LOCALITY_SHIFT);
}
static void tpm_tis_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
TPMIfClass *tc = TPM_IF_CLASS(klass);
dc->realize = tpm_tis_realizefn;
dc->props = tpm_tis_properties;
dc->reset = tpm_tis_reset;
dc->vmsd = &vmstate_tpm_tis;
tc->model = TPM_MODEL_TPM_TIS;
tc->request_completed = tpm_tis_request_completed;
}
static const TypeInfo tpm_tis_info = {
.name = TYPE_TPM_TIS,
.parent = TYPE_ISA_DEVICE,
.instance_size = sizeof(TPMState),
.instance_init = tpm_tis_initfn,
.class_init = tpm_tis_class_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_TPM_IF },
{ }
}
};
static void tpm_tis_register(void)
{
type_register_static(&tpm_tis_info);
tpm_register_model(TPM_MODEL_TPM_TIS);
}
type_init(tpm_tis_register)
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