blob: 68eaaa639f89d97965eaccda5d67ff3723f6c4ea [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2023 Linaro Limited
* Copyright (c) 2018 Bootlin
* Author: Miquel Raynal <miquel.raynal@bootlin.com>
*/
#include <dm.h>
#include <dm/of_access.h>
#include <tpm_api.h>
#include <tpm-common.h>
#include <tpm-v2.h>
#include <u-boot/sha1.h>
#include <u-boot/sha256.h>
#include <u-boot/sha512.h>
#include <version_string.h>
#include <asm/io.h>
#include <linux/bitops.h>
#include <linux/unaligned/be_byteshift.h>
#include <linux/unaligned/generic.h>
#include <linux/unaligned/le_byteshift.h>
#include "tpm-utils.h"
const enum tpm2_algorithms tpm2_supported_algorithms[4] = {
TPM2_ALG_SHA1,
TPM2_ALG_SHA256,
TPM2_ALG_SHA384,
TPM2_ALG_SHA512,
};
int tcg2_get_active_pcr_banks(struct udevice *dev, u32 *active_pcr_banks)
{
u32 supported = 0;
u32 pcr_banks = 0;
u32 active = 0;
int rc;
rc = tpm2_get_pcr_info(dev, &supported, &active, &pcr_banks);
if (rc)
return rc;
*active_pcr_banks = active;
return 0;
}
u32 tcg2_event_get_size(struct tpml_digest_values *digest_list)
{
u32 len;
size_t i;
len = offsetof(struct tcg_pcr_event2, digests);
len += offsetof(struct tpml_digest_values, digests);
for (i = 0; i < digest_list->count; ++i) {
u16 l = tpm2_algorithm_to_len(digest_list->digests[i].hash_alg);
if (!l)
continue;
len += l + offsetof(struct tpmt_ha, digest);
}
len += sizeof(u32);
return len;
}
int tcg2_create_digest(struct udevice *dev, const u8 *input, u32 length,
struct tpml_digest_values *digest_list)
{
u8 final[sizeof(union tpmu_ha)];
sha256_context ctx_256;
sha512_context ctx_512;
sha1_context ctx;
u32 active;
size_t i;
u32 len;
int rc;
rc = tcg2_get_active_pcr_banks(dev, &active);
if (rc)
return rc;
digest_list->count = 0;
for (i = 0; i < ARRAY_SIZE(tpm2_supported_algorithms); ++i) {
u32 mask =
tpm2_algorithm_to_mask(tpm2_supported_algorithms[i]);
if (!(active & mask))
continue;
switch (tpm2_supported_algorithms[i]) {
case TPM2_ALG_SHA1:
sha1_starts(&ctx);
sha1_update(&ctx, input, length);
sha1_finish(&ctx, final);
len = TPM2_SHA1_DIGEST_SIZE;
break;
case TPM2_ALG_SHA256:
sha256_starts(&ctx_256);
sha256_update(&ctx_256, input, length);
sha256_finish(&ctx_256, final);
len = TPM2_SHA256_DIGEST_SIZE;
break;
case TPM2_ALG_SHA384:
sha384_starts(&ctx_512);
sha384_update(&ctx_512, input, length);
sha384_finish(&ctx_512, final);
len = TPM2_SHA384_DIGEST_SIZE;
break;
case TPM2_ALG_SHA512:
sha512_starts(&ctx_512);
sha512_update(&ctx_512, input, length);
sha512_finish(&ctx_512, final);
len = TPM2_SHA512_DIGEST_SIZE;
break;
default:
printf("%s: unsupported algorithm %x\n", __func__,
tpm2_supported_algorithms[i]);
continue;
}
digest_list->digests[digest_list->count].hash_alg =
tpm2_supported_algorithms[i];
memcpy(&digest_list->digests[digest_list->count].digest, final,
len);
digest_list->count++;
}
return 0;
}
void tcg2_log_append(u32 pcr_index, u32 event_type,
struct tpml_digest_values *digest_list, u32 size,
const u8 *event, u8 *log)
{
size_t len;
size_t pos;
u32 i;
pos = offsetof(struct tcg_pcr_event2, pcr_index);
put_unaligned_le32(pcr_index, log);
pos = offsetof(struct tcg_pcr_event2, event_type);
put_unaligned_le32(event_type, log + pos);
pos = offsetof(struct tcg_pcr_event2, digests) +
offsetof(struct tpml_digest_values, count);
put_unaligned_le32(digest_list->count, log + pos);
pos = offsetof(struct tcg_pcr_event2, digests) +
offsetof(struct tpml_digest_values, digests);
for (i = 0; i < digest_list->count; ++i) {
u16 hash_alg = digest_list->digests[i].hash_alg;
len = tpm2_algorithm_to_len(hash_alg);
if (!len)
continue;
pos += offsetof(struct tpmt_ha, hash_alg);
put_unaligned_le16(hash_alg, log + pos);
pos += offsetof(struct tpmt_ha, digest);
memcpy(log + pos, (u8 *)&digest_list->digests[i].digest, len);
pos += len;
}
put_unaligned_le32(size, log + pos);
pos += sizeof(u32);
memcpy(log + pos, event, size);
}
static int tcg2_log_append_check(struct tcg2_event_log *elog, u32 pcr_index,
u32 event_type,
struct tpml_digest_values *digest_list,
u32 size, const u8 *event)
{
u32 event_size;
u8 *log;
event_size = size + tcg2_event_get_size(digest_list);
if (elog->log_position + event_size > elog->log_size) {
printf("%s: log too large: %u + %u > %u\n", __func__,
elog->log_position, event_size, elog->log_size);
return -ENOBUFS;
}
log = elog->log + elog->log_position;
elog->log_position += event_size;
tcg2_log_append(pcr_index, event_type, digest_list, size, event, log);
return 0;
}
static int tcg2_log_init(struct udevice *dev, struct tcg2_event_log *elog)
{
struct tcg_efi_spec_id_event *ev;
struct tcg_pcr_event *log;
u32 event_size;
u32 count = 0;
u32 log_size;
u32 active;
u32 mask;
size_t i;
u16 len;
int rc;
rc = tcg2_get_active_pcr_banks(dev, &active);
if (rc)
return rc;
event_size = offsetof(struct tcg_efi_spec_id_event, digest_sizes);
for (i = 0; i < ARRAY_SIZE(tpm2_supported_algorithms); ++i) {
mask = tpm2_algorithm_to_mask(tpm2_supported_algorithms[i]);
if (!(active & mask))
continue;
switch (tpm2_supported_algorithms[i]) {
case TPM2_ALG_SHA1:
case TPM2_ALG_SHA256:
case TPM2_ALG_SHA384:
case TPM2_ALG_SHA512:
count++;
break;
default:
continue;
}
}
event_size += 1 +
(sizeof(struct tcg_efi_spec_id_event_algorithm_size) * count);
log_size = offsetof(struct tcg_pcr_event, event) + event_size;
if (log_size > elog->log_size) {
printf("%s: log too large: %u > %u\n", __func__, log_size,
elog->log_size);
return -ENOBUFS;
}
log = (struct tcg_pcr_event *)elog->log;
put_unaligned_le32(0, &log->pcr_index);
put_unaligned_le32(EV_NO_ACTION, &log->event_type);
memset(&log->digest, 0, sizeof(log->digest));
put_unaligned_le32(event_size, &log->event_size);
ev = (struct tcg_efi_spec_id_event *)log->event;
strlcpy((char *)ev->signature, TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03,
sizeof(ev->signature));
put_unaligned_le32(0, &ev->platform_class);
ev->spec_version_minor = TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MINOR_TPM2;
ev->spec_version_major = TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MAJOR_TPM2;
ev->spec_errata = TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_ERRATA_TPM2;
ev->uintn_size = sizeof(size_t) / sizeof(u32);
put_unaligned_le32(count, &ev->number_of_algorithms);
count = 0;
for (i = 0; i < ARRAY_SIZE(tpm2_supported_algorithms); ++i) {
mask = tpm2_algorithm_to_mask(tpm2_supported_algorithms[i]);
if (!(active & mask))
continue;
len = tpm2_algorithm_to_len(tpm2_supported_algorithms[i]);
if (!len)
continue;
put_unaligned_le16(tpm2_supported_algorithms[i],
&ev->digest_sizes[count].algorithm_id);
put_unaligned_le16(len, &ev->digest_sizes[count].digest_size);
count++;
}
*((u8 *)ev + (event_size - 1)) = 0;
elog->log_position = log_size;
return 0;
}
static int tcg2_replay_eventlog(struct tcg2_event_log *elog,
struct udevice *dev,
struct tpml_digest_values *digest_list,
u32 log_position)
{
const u32 offset = offsetof(struct tcg_pcr_event2, digests) +
offsetof(struct tpml_digest_values, digests);
u32 event_size;
u32 count;
u16 algo;
u32 pcr;
u32 pos;
u16 len;
u8 *log;
int rc;
u32 i;
while (log_position + offset < elog->log_size) {
log = elog->log + log_position;
pos = offsetof(struct tcg_pcr_event2, pcr_index);
pcr = get_unaligned_le32(log + pos);
pos = offsetof(struct tcg_pcr_event2, event_type);
if (!get_unaligned_le32(log + pos))
return 0;
pos = offsetof(struct tcg_pcr_event2, digests) +
offsetof(struct tpml_digest_values, count);
count = get_unaligned_le32(log + pos);
if (count > ARRAY_SIZE(tpm2_supported_algorithms) ||
(digest_list->count && digest_list->count != count))
return 0;
pos = offsetof(struct tcg_pcr_event2, digests) +
offsetof(struct tpml_digest_values, digests);
for (i = 0; i < count; ++i) {
pos += offsetof(struct tpmt_ha, hash_alg);
if (log_position + pos + sizeof(u16) >= elog->log_size)
return 0;
algo = get_unaligned_le16(log + pos);
pos += offsetof(struct tpmt_ha, digest);
switch (algo) {
case TPM2_ALG_SHA1:
case TPM2_ALG_SHA256:
case TPM2_ALG_SHA384:
case TPM2_ALG_SHA512:
len = tpm2_algorithm_to_len(algo);
break;
default:
return 0;
}
if (digest_list->count) {
if (algo != digest_list->digests[i].hash_alg ||
log_position + pos + len >= elog->log_size)
return 0;
memcpy(digest_list->digests[i].digest.sha512,
log + pos, len);
}
pos += len;
}
if (log_position + pos + sizeof(u32) >= elog->log_size)
return 0;
event_size = get_unaligned_le32(log + pos);
pos += event_size + sizeof(u32);
if (log_position + pos > elog->log_size)
return 0;
if (digest_list->count) {
rc = tcg2_pcr_extend(dev, pcr, digest_list);
if (rc)
return rc;
}
log_position += pos;
}
elog->log_position = log_position;
elog->found = true;
return 0;
}
static int tcg2_log_parse(struct udevice *dev, struct tcg2_event_log *elog)
{
struct tpml_digest_values digest_list;
struct tcg_efi_spec_id_event *event;
struct tcg_pcr_event *log;
u32 log_active;
u32 calc_size;
u32 active;
u32 count;
u32 evsz;
u32 mask;
u16 algo;
u16 len;
int rc;
u32 i;
u16 j;
if (elog->log_size <= offsetof(struct tcg_pcr_event, event))
return 0;
log = (struct tcg_pcr_event *)elog->log;
if (get_unaligned_le32(&log->pcr_index) != 0 ||
get_unaligned_le32(&log->event_type) != EV_NO_ACTION)
return 0;
for (i = 0; i < sizeof(log->digest); i++) {
if (log->digest[i])
return 0;
}
evsz = get_unaligned_le32(&log->event_size);
if (evsz < offsetof(struct tcg_efi_spec_id_event, digest_sizes) ||
evsz + offsetof(struct tcg_pcr_event, event) > elog->log_size)
return 0;
event = (struct tcg_efi_spec_id_event *)log->event;
if (memcmp(event->signature, TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03,
sizeof(TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03)))
return 0;
if (event->spec_version_minor != TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MINOR_TPM2 ||
event->spec_version_major != TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MAJOR_TPM2)
return 0;
count = get_unaligned_le32(&event->number_of_algorithms);
if (count > ARRAY_SIZE(tpm2_supported_algorithms))
return 0;
calc_size = offsetof(struct tcg_efi_spec_id_event, digest_sizes) +
(sizeof(struct tcg_efi_spec_id_event_algorithm_size) * count) +
1;
if (evsz != calc_size)
return 0;
rc = tcg2_get_active_pcr_banks(dev, &active);
if (rc)
return rc;
digest_list.count = 0;
log_active = 0;
for (i = 0; i < count; ++i) {
algo = get_unaligned_le16(&event->digest_sizes[i].algorithm_id);
mask = tpm2_algorithm_to_mask(algo);
if (!(active & mask))
return 0;
switch (algo) {
case TPM2_ALG_SHA1:
case TPM2_ALG_SHA256:
case TPM2_ALG_SHA384:
case TPM2_ALG_SHA512:
len = get_unaligned_le16(&event->digest_sizes[i].digest_size);
if (tpm2_algorithm_to_len(algo) != len)
return 0;
digest_list.digests[digest_list.count++].hash_alg = algo;
break;
default:
return 0;
}
log_active |= mask;
}
/* Ensure the previous firmware extended all the PCRs. */
if (log_active != active)
return 0;
/* Read PCR0 to check if previous firmware extended the PCRs or not. */
rc = tcg2_pcr_read(dev, 0, &digest_list);
if (rc)
return rc;
for (i = 0; i < digest_list.count; ++i) {
len = tpm2_algorithm_to_len(digest_list.digests[i].hash_alg);
for (j = 0; j < len; ++j) {
if (digest_list.digests[i].digest.sha512[j])
break;
}
/* PCR is non-zero; it has been extended, so skip extending. */
if (j != len) {
digest_list.count = 0;
break;
}
}
return tcg2_replay_eventlog(elog, dev, &digest_list,
offsetof(struct tcg_pcr_event, event) +
evsz);
}
int tcg2_pcr_extend(struct udevice *dev, u32 pcr_index,
struct tpml_digest_values *digest_list)
{
u32 rc;
u32 i;
for (i = 0; i < digest_list->count; i++) {
u32 alg = digest_list->digests[i].hash_alg;
rc = tpm2_pcr_extend(dev, pcr_index, alg,
(u8 *)&digest_list->digests[i].digest,
tpm2_algorithm_to_len(alg));
if (rc) {
printf("%s: error pcr:%u alg:%08x\n", __func__,
pcr_index, alg);
return rc;
}
}
return 0;
}
int tcg2_pcr_read(struct udevice *dev, u32 pcr_index,
struct tpml_digest_values *digest_list)
{
struct tpm_chip_priv *priv;
u32 rc;
u32 i;
priv = dev_get_uclass_priv(dev);
if (!priv)
return -ENODEV;
for (i = 0; i < digest_list->count; i++) {
u32 alg = digest_list->digests[i].hash_alg;
u8 *digest = (u8 *)&digest_list->digests[i].digest;
rc = tpm2_pcr_read(dev, pcr_index, priv->pcr_select_min, alg,
digest, tpm2_algorithm_to_len(alg), NULL);
if (rc) {
printf("%s: error pcr:%u alg:%08x\n", __func__,
pcr_index, alg);
return rc;
}
}
return 0;
}
int tcg2_measure_data(struct udevice *dev, struct tcg2_event_log *elog,
u32 pcr_index, u32 size, const u8 *data, u32 event_type,
u32 event_size, const u8 *event)
{
struct tpml_digest_values digest_list;
int rc;
if (data)
rc = tcg2_create_digest(dev, data, size, &digest_list);
else
rc = tcg2_create_digest(dev, event, event_size, &digest_list);
if (rc)
return rc;
rc = tcg2_pcr_extend(dev, pcr_index, &digest_list);
if (rc)
return rc;
return tcg2_log_append_check(elog, pcr_index, event_type, &digest_list,
event_size, event);
}
int tcg2_log_prepare_buffer(struct udevice *dev, struct tcg2_event_log *elog,
bool ignore_existing_log)
{
struct tcg2_event_log log;
int rc;
elog->log_position = 0;
elog->found = false;
rc = tcg2_platform_get_log(dev, (void **)&log.log, &log.log_size);
if (!rc) {
log.log_position = 0;
log.found = false;
if (!ignore_existing_log) {
rc = tcg2_log_parse(dev, &log);
if (rc)
return rc;
}
if (elog->log_size) {
if (log.found) {
if (elog->log_size < log.log_position)
return -ENOSPC;
/*
* Copy the discovered log into the user buffer
* if there's enough space.
*/
memcpy(elog->log, log.log, log.log_position);
}
unmap_physmem(log.log, MAP_NOCACHE);
} else {
elog->log = log.log;
elog->log_size = log.log_size;
}
elog->log_position = log.log_position;
elog->found = log.found;
}
/*
* Initialize the log buffer if no log was discovered and the buffer is
* valid. User's can pass in their own buffer as a fallback if no
* memory region is found.
*/
if (!elog->found && elog->log_size)
rc = tcg2_log_init(dev, elog);
return rc;
}
int tcg2_measurement_init(struct udevice **dev, struct tcg2_event_log *elog,
bool ignore_existing_log)
{
int rc;
rc = tcg2_platform_get_tpm2(dev);
if (rc)
return rc;
rc = tpm_auto_start(*dev);
if (rc)
return rc;
rc = tcg2_log_prepare_buffer(*dev, elog, ignore_existing_log);
if (rc) {
tcg2_measurement_term(*dev, elog, true);
return rc;
}
rc = tcg2_measure_event(*dev, elog, 0, EV_S_CRTM_VERSION,
strlen(version_string) + 1,
(u8 *)version_string);
if (rc) {
tcg2_measurement_term(*dev, elog, true);
return rc;
}
return 0;
}
void tcg2_measurement_term(struct udevice *dev, struct tcg2_event_log *elog,
bool error)
{
u32 event = error ? 0x1 : 0xffffffff;
int i;
for (i = 0; i < 8; ++i)
tcg2_measure_event(dev, elog, i, EV_SEPARATOR, sizeof(event),
(const u8 *)&event);
if (elog->log)
unmap_physmem(elog->log, MAP_NOCACHE);
}
__weak int tcg2_platform_get_log(struct udevice *dev, void **addr, u32 *size)
{
const __be32 *addr_prop;
const __be32 *size_prop;
int asize;
int ssize;
*addr = NULL;
*size = 0;
addr_prop = dev_read_prop(dev, "tpm_event_log_addr", &asize);
if (!addr_prop)
addr_prop = dev_read_prop(dev, "linux,sml-base", &asize);
size_prop = dev_read_prop(dev, "tpm_event_log_size", &ssize);
if (!size_prop)
size_prop = dev_read_prop(dev, "linux,sml-size", &ssize);
if (addr_prop && size_prop) {
u64 a = of_read_number(addr_prop, asize / sizeof(__be32));
u64 s = of_read_number(size_prop, ssize / sizeof(__be32));
*addr = map_physmem(a, s, MAP_NOCACHE);
*size = (u32)s;
} else {
struct ofnode_phandle_args args;
phys_addr_t a;
fdt_size_t s;
if (dev_read_phandle_with_args(dev, "memory-region", NULL, 0,
0, &args))
return -ENODEV;
a = ofnode_get_addr_size(args.node, "reg", &s);
if (a == FDT_ADDR_T_NONE)
return -ENOMEM;
*addr = map_physmem(a, s, MAP_NOCACHE);
*size = (u32)s;
}
return 0;
}
__weak int tcg2_platform_get_tpm2(struct udevice **dev)
{
for_each_tpm_device(*dev) {
if (tpm_get_version(*dev) == TPM_V2)
return 0;
}
return -ENODEV;
}
__weak void tcg2_platform_startup_error(struct udevice *dev, int rc) {}
u32 tpm2_startup(struct udevice *dev, enum tpm2_startup_types mode)
{
const u8 command_v2[12] = {
tpm_u16(TPM2_ST_NO_SESSIONS),
tpm_u32(12),
tpm_u32(TPM2_CC_STARTUP),
tpm_u16(mode),
};
int ret;
/*
* Note TPM2_Startup command will return RC_SUCCESS the first time,
* but will return RC_INITIALIZE otherwise.
*/
ret = tpm_sendrecv_command(dev, command_v2, NULL, NULL);
if (ret && ret != TPM2_RC_INITIALIZE)
return ret;
return 0;
}
u32 tpm2_self_test(struct udevice *dev, enum tpm2_yes_no full_test)
{
const u8 command_v2[12] = {
tpm_u16(TPM2_ST_NO_SESSIONS),
tpm_u32(11),
tpm_u32(TPM2_CC_SELF_TEST),
full_test,
};
return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}
u32 tpm2_auto_start(struct udevice *dev)
{
u32 rc;
rc = tpm2_self_test(dev, TPMI_YES);
if (rc == TPM2_RC_INITIALIZE) {
rc = tpm2_startup(dev, TPM2_SU_CLEAR);
if (rc)
return rc;
rc = tpm2_self_test(dev, TPMI_YES);
}
return rc;
}
u32 tpm2_clear(struct udevice *dev, u32 handle, const char *pw,
const ssize_t pw_sz)
{
/* Length of the message header, up to start of password */
uint offset = 27;
u8 command_v2[COMMAND_BUFFER_SIZE] = {
tpm_u16(TPM2_ST_SESSIONS), /* TAG */
tpm_u32(offset + pw_sz), /* Length */
tpm_u32(TPM2_CC_CLEAR), /* Command code */
/* HANDLE */
tpm_u32(handle), /* TPM resource handle */
/* AUTH_SESSION */
tpm_u32(9 + pw_sz), /* Authorization size */
tpm_u32(TPM2_RS_PW), /* Session handle */
tpm_u16(0), /* Size of <nonce> */
/* <nonce> (if any) */
0, /* Attributes: Cont/Excl/Rst */
tpm_u16(pw_sz), /* Size of <hmac/password> */
/* STRING(pw) <hmac/password> (if any) */
};
int ret;
/*
* Fill the command structure starting from the first buffer:
* - the password (if any)
*/
ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
offset, pw, pw_sz);
offset += pw_sz;
if (ret)
return TPM_LIB_ERROR;
return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}
u32 tpm2_nv_define_space(struct udevice *dev, u32 space_index,
size_t space_size, u32 nv_attributes,
const u8 *nv_policy, size_t nv_policy_size)
{
/*
* Calculate the offset of the nv_policy piece by adding each of the
* chunks below.
*/
const int platform_len = sizeof(u32);
const int session_hdr_len = 13;
const int message_len = 14;
uint offset = TPM2_HDR_LEN + platform_len + session_hdr_len +
message_len;
u8 command_v2[COMMAND_BUFFER_SIZE] = {
/* header 10 bytes */
tpm_u16(TPM2_ST_SESSIONS), /* TAG */
tpm_u32(offset + nv_policy_size + 2),/* Length */
tpm_u32(TPM2_CC_NV_DEFINE_SPACE),/* Command code */
/* handles 4 bytes */
tpm_u32(TPM2_RH_PLATFORM), /* Primary platform seed */
/* session header 13 bytes */
tpm_u32(9), /* Header size */
tpm_u32(TPM2_RS_PW), /* Password authorisation */
tpm_u16(0), /* nonce_size */
0, /* session_attrs */
tpm_u16(0), /* auth_size */
/* message 14 bytes + policy */
tpm_u16(message_len + nv_policy_size), /* size */
tpm_u32(space_index),
tpm_u16(TPM2_ALG_SHA256),
tpm_u32(nv_attributes),
tpm_u16(nv_policy_size),
/*
* nv_policy
* space_size
*/
};
int ret;
/*
* Fill the command structure starting from the first buffer:
* - the password (if any)
*/
ret = pack_byte_string(command_v2, sizeof(command_v2), "sw",
offset, nv_policy, nv_policy_size,
offset + nv_policy_size, space_size);
if (ret)
return TPM_LIB_ERROR;
return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}
u32 tpm2_pcr_extend(struct udevice *dev, u32 index, u32 algorithm,
const u8 *digest, u32 digest_len)
{
/* Length of the message header, up to start of digest */
uint offset = 33;
u8 command_v2[COMMAND_BUFFER_SIZE] = {
tpm_u16(TPM2_ST_SESSIONS), /* TAG */
tpm_u32(offset + digest_len), /* Length */
tpm_u32(TPM2_CC_PCR_EXTEND), /* Command code */
/* HANDLE */
tpm_u32(index), /* Handle (PCR Index) */
/* AUTH_SESSION */
tpm_u32(9), /* Authorization size */
tpm_u32(TPM2_RS_PW), /* Session handle */
tpm_u16(0), /* Size of <nonce> */
/* <nonce> (if any) */
0, /* Attributes: Cont/Excl/Rst */
tpm_u16(0), /* Size of <hmac/password> */
/* <hmac/password> (if any) */
/* hashes */
tpm_u32(1), /* Count (number of hashes) */
tpm_u16(algorithm), /* Algorithm of the hash */
/* STRING(digest) Digest */
};
int ret;
if (!digest)
return -EINVAL;
/*
* Fill the command structure starting from the first buffer:
* - the digest
*/
ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
offset, digest, digest_len);
if (ret)
return TPM_LIB_ERROR;
return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}
u32 tpm2_nv_read_value(struct udevice *dev, u32 index, void *data, u32 count)
{
u8 command_v2[COMMAND_BUFFER_SIZE] = {
/* header 10 bytes */
tpm_u16(TPM2_ST_SESSIONS), /* TAG */
tpm_u32(10 + 8 + 4 + 9 + 4), /* Length */
tpm_u32(TPM2_CC_NV_READ), /* Command code */
/* handles 8 bytes */
tpm_u32(TPM2_RH_PLATFORM), /* Primary platform seed */
tpm_u32(HR_NV_INDEX + index), /* Password authorisation */
/* AUTH_SESSION */
tpm_u32(9), /* Authorization size */
tpm_u32(TPM2_RS_PW), /* Session handle */
tpm_u16(0), /* Size of <nonce> */
/* <nonce> (if any) */
0, /* Attributes: Cont/Excl/Rst */
tpm_u16(0), /* Size of <hmac/password> */
/* <hmac/password> (if any) */
tpm_u16(count), /* Number of bytes */
tpm_u16(0), /* Offset */
};
size_t response_len = COMMAND_BUFFER_SIZE;
u8 response[COMMAND_BUFFER_SIZE];
int ret;
u16 tag;
u32 size, code;
ret = tpm_sendrecv_command(dev, command_v2, response, &response_len);
if (ret)
return log_msg_ret("read", ret);
if (unpack_byte_string(response, response_len, "wdds",
0, &tag, 2, &size, 6, &code,
16, data, count))
return TPM_LIB_ERROR;
return 0;
}
u32 tpm2_nv_write_value(struct udevice *dev, u32 index, const void *data,
u32 count)
{
struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
uint offset = 10 + 8 + 4 + 9 + 2;
uint len = offset + count + 2;
/* Use empty password auth if platform hierarchy is disabled */
u32 auth = priv->plat_hier_disabled ? HR_NV_INDEX + index :
TPM2_RH_PLATFORM;
u8 command_v2[COMMAND_BUFFER_SIZE] = {
/* header 10 bytes */
tpm_u16(TPM2_ST_SESSIONS), /* TAG */
tpm_u32(len), /* Length */
tpm_u32(TPM2_CC_NV_WRITE), /* Command code */
/* handles 8 bytes */
tpm_u32(auth), /* Primary platform seed */
tpm_u32(HR_NV_INDEX + index), /* Password authorisation */
/* AUTH_SESSION */
tpm_u32(9), /* Authorization size */
tpm_u32(TPM2_RS_PW), /* Session handle */
tpm_u16(0), /* Size of <nonce> */
/* <nonce> (if any) */
0, /* Attributes: Cont/Excl/Rst */
tpm_u16(0), /* Size of <hmac/password> */
/* <hmac/password> (if any) */
tpm_u16(count),
};
size_t response_len = COMMAND_BUFFER_SIZE;
u8 response[COMMAND_BUFFER_SIZE];
int ret;
ret = pack_byte_string(command_v2, sizeof(command_v2), "sw",
offset, data, count,
offset + count, 0);
if (ret)
return TPM_LIB_ERROR;
return tpm_sendrecv_command(dev, command_v2, response, &response_len);
}
u32 tpm2_pcr_read(struct udevice *dev, u32 idx, unsigned int idx_min_sz,
u16 algorithm, void *data, u32 digest_len,
unsigned int *updates)
{
u8 idx_array_sz = max(idx_min_sz, DIV_ROUND_UP(idx, 8));
u8 command_v2[COMMAND_BUFFER_SIZE] = {
tpm_u16(TPM2_ST_NO_SESSIONS), /* TAG */
tpm_u32(17 + idx_array_sz), /* Length */
tpm_u32(TPM2_CC_PCR_READ), /* Command code */
/* TPML_PCR_SELECTION */
tpm_u32(1), /* Number of selections */
tpm_u16(algorithm), /* Algorithm of the hash */
idx_array_sz, /* Array size for selection */
/* bitmap(idx) Selected PCR bitmap */
};
size_t response_len = COMMAND_BUFFER_SIZE;
u8 response[COMMAND_BUFFER_SIZE];
unsigned int pcr_sel_idx = idx / 8;
u8 pcr_sel_bit = BIT(idx % 8);
unsigned int counter = 0;
int ret;
if (pack_byte_string(command_v2, COMMAND_BUFFER_SIZE, "b",
17 + pcr_sel_idx, pcr_sel_bit))
return TPM_LIB_ERROR;
ret = tpm_sendrecv_command(dev, command_v2, response, &response_len);
if (ret)
return ret;
if (digest_len > response_len)
return TPM_LIB_ERROR;
if (unpack_byte_string(response, response_len, "ds",
10, &counter,
response_len - digest_len, data,
digest_len))
return TPM_LIB_ERROR;
if (updates)
*updates = counter;
return 0;
}
u32 tpm2_get_capability(struct udevice *dev, u32 capability, u32 property,
void *buf, size_t prop_count)
{
u8 command_v2[COMMAND_BUFFER_SIZE] = {
tpm_u16(TPM2_ST_NO_SESSIONS), /* TAG */
tpm_u32(22), /* Length */
tpm_u32(TPM2_CC_GET_CAPABILITY), /* Command code */
tpm_u32(capability), /* Capability */
tpm_u32(property), /* Property */
tpm_u32(prop_count), /* Property count */
};
u8 response[COMMAND_BUFFER_SIZE];
size_t response_len = COMMAND_BUFFER_SIZE;
unsigned int properties_off;
int ret;
ret = tpm_sendrecv_command(dev, command_v2, response, &response_len);
if (ret)
return ret;
/*
* In the response buffer, the properties are located after the:
* tag (u16), response size (u32), response code (u32),
* YES/NO flag (u8), TPM_CAP (u32).
*/
properties_off = sizeof(u16) + sizeof(u32) + sizeof(u32) +
sizeof(u8) + sizeof(u32);
memcpy(buf, &response[properties_off], response_len - properties_off);
return 0;
}
static int tpm2_get_num_pcr(struct udevice *dev, u32 *num_pcr)
{
u8 response[(sizeof(struct tpms_capability_data) -
offsetof(struct tpms_capability_data, data))];
u32 properties_offset =
offsetof(struct tpml_tagged_tpm_property, tpm_property) +
offsetof(struct tpms_tagged_property, value);
u32 ret;
memset(response, 0, sizeof(response));
ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES,
TPM2_PT_PCR_COUNT, response, 1);
if (ret)
return ret;
*num_pcr = get_unaligned_be32(response + properties_offset);
if (*num_pcr > TPM2_MAX_PCRS) {
printf("%s: too many pcrs: %u\n", __func__, *num_pcr);
return -E2BIG;
}
return 0;
}
static bool tpm2_is_active_pcr(struct tpms_pcr_selection *selection)
{
int i;
/*
* check the pcr_select. If at least one of the PCRs supports the
* algorithm add it on the active ones
*/
for (i = 0; i < selection->size_of_select; i++) {
if (selection->pcr_select[i])
return true;
}
return false;
}
int tpm2_get_pcr_info(struct udevice *dev, u32 *supported_pcr, u32 *active_pcr,
u32 *pcr_banks)
{
u8 response[(sizeof(struct tpms_capability_data) -
offsetof(struct tpms_capability_data, data))];
struct tpml_pcr_selection pcrs;
u32 num_pcr;
size_t i;
u32 ret;
*supported_pcr = 0;
*active_pcr = 0;
*pcr_banks = 0;
memset(response, 0, sizeof(response));
ret = tpm2_get_capability(dev, TPM2_CAP_PCRS, 0, response, 1);
if (ret)
return ret;
pcrs.count = get_unaligned_be32(response);
/*
* We only support 5 algorithms for now so check against that
* instead of TPM2_NUM_PCR_BANKS
*/
if (pcrs.count > ARRAY_SIZE(tpm2_supported_algorithms) ||
pcrs.count < 1) {
printf("%s: too many pcrs: %u\n", __func__, pcrs.count);
return -EMSGSIZE;
}
ret = tpm2_get_num_pcr(dev, &num_pcr);
if (ret)
return ret;
for (i = 0; i < pcrs.count; i++) {
/*
* Definition of TPMS_PCR_SELECTION Structure
* hash: u16
* size_of_select: u8
* pcr_select: u8 array
*
* The offsets depend on the number of the device PCRs
* so we have to calculate them based on that
*/
u32 hash_offset = offsetof(struct tpml_pcr_selection, selection) +
i * offsetof(struct tpms_pcr_selection, pcr_select) +
i * ((num_pcr + 7) / 8);
u32 size_select_offset =
hash_offset + offsetof(struct tpms_pcr_selection,
size_of_select);
u32 pcr_select_offset =
hash_offset + offsetof(struct tpms_pcr_selection,
pcr_select);
pcrs.selection[i].hash =
get_unaligned_be16(response + hash_offset);
pcrs.selection[i].size_of_select =
__get_unaligned_be(response + size_select_offset);
if (pcrs.selection[i].size_of_select > TPM2_PCR_SELECT_MAX) {
printf("%s: pcrs selection too large: %u\n", __func__,
pcrs.selection[i].size_of_select);
return -ENOBUFS;
}
/* copy the array of pcr_select */
memcpy(pcrs.selection[i].pcr_select, response + pcr_select_offset,
pcrs.selection[i].size_of_select);
}
for (i = 0; i < pcrs.count; i++) {
u32 hash_mask = tpm2_algorithm_to_mask(pcrs.selection[i].hash);
if (hash_mask) {
*supported_pcr |= hash_mask;
if (tpm2_is_active_pcr(&pcrs.selection[i]))
*active_pcr |= hash_mask;
} else {
printf("%s: unknown algorithm %x\n", __func__,
pcrs.selection[i].hash);
}
}
*pcr_banks = pcrs.count;
return 0;
}
u32 tpm2_dam_reset(struct udevice *dev, const char *pw, const ssize_t pw_sz)
{
u8 command_v2[COMMAND_BUFFER_SIZE] = {
tpm_u16(TPM2_ST_SESSIONS), /* TAG */
tpm_u32(27 + pw_sz), /* Length */
tpm_u32(TPM2_CC_DAM_RESET), /* Command code */
/* HANDLE */
tpm_u32(TPM2_RH_LOCKOUT), /* TPM resource handle */
/* AUTH_SESSION */
tpm_u32(9 + pw_sz), /* Authorization size */
tpm_u32(TPM2_RS_PW), /* Session handle */
tpm_u16(0), /* Size of <nonce> */
/* <nonce> (if any) */
0, /* Attributes: Cont/Excl/Rst */
tpm_u16(pw_sz), /* Size of <hmac/password> */
/* STRING(pw) <hmac/password> (if any) */
};
unsigned int offset = 27;
int ret;
/*
* Fill the command structure starting from the first buffer:
* - the password (if any)
*/
ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
offset, pw, pw_sz);
offset += pw_sz;
if (ret)
return TPM_LIB_ERROR;
return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}
u32 tpm2_dam_parameters(struct udevice *dev, const char *pw,
const ssize_t pw_sz, unsigned int max_tries,
unsigned int recovery_time,
unsigned int lockout_recovery)
{
u8 command_v2[COMMAND_BUFFER_SIZE] = {
tpm_u16(TPM2_ST_SESSIONS), /* TAG */
tpm_u32(27 + pw_sz + 12), /* Length */
tpm_u32(TPM2_CC_DAM_PARAMETERS), /* Command code */
/* HANDLE */
tpm_u32(TPM2_RH_LOCKOUT), /* TPM resource handle */
/* AUTH_SESSION */
tpm_u32(9 + pw_sz), /* Authorization size */
tpm_u32(TPM2_RS_PW), /* Session handle */
tpm_u16(0), /* Size of <nonce> */
/* <nonce> (if any) */
0, /* Attributes: Cont/Excl/Rst */
tpm_u16(pw_sz), /* Size of <hmac/password> */
/* STRING(pw) <hmac/password> (if any) */
/* LOCKOUT PARAMETERS */
/* tpm_u32(max_tries) Max tries (0, always lock) */
/* tpm_u32(recovery_time) Recovery time (0, no lock) */
/* tpm_u32(lockout_recovery) Lockout recovery */
};
unsigned int offset = 27;
int ret;
/*
* Fill the command structure starting from the first buffer:
* - the password (if any)
* - max tries
* - recovery time
* - lockout recovery
*/
ret = pack_byte_string(command_v2, sizeof(command_v2), "sddd",
offset, pw, pw_sz,
offset + pw_sz, max_tries,
offset + pw_sz + 4, recovery_time,
offset + pw_sz + 8, lockout_recovery);
offset += pw_sz + 12;
if (ret)
return TPM_LIB_ERROR;
return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}
int tpm2_change_auth(struct udevice *dev, u32 handle, const char *newpw,
const ssize_t newpw_sz, const char *oldpw,
const ssize_t oldpw_sz)
{
unsigned int offset = 27;
u8 command_v2[COMMAND_BUFFER_SIZE] = {
tpm_u16(TPM2_ST_SESSIONS), /* TAG */
tpm_u32(offset + oldpw_sz + 2 + newpw_sz), /* Length */
tpm_u32(TPM2_CC_HIERCHANGEAUTH), /* Command code */
/* HANDLE */
tpm_u32(handle), /* TPM resource handle */
/* AUTH_SESSION */
tpm_u32(9 + oldpw_sz), /* Authorization size */
tpm_u32(TPM2_RS_PW), /* Session handle */
tpm_u16(0), /* Size of <nonce> */
/* <nonce> (if any) */
0, /* Attributes: Cont/Excl/Rst */
tpm_u16(oldpw_sz) /* Size of <hmac/password> */
/* STRING(oldpw) <hmac/password> (if any) */
/* TPM2B_AUTH (TPM2B_DIGEST) */
/* tpm_u16(newpw_sz) Digest size, new pw length */
/* STRING(newpw) Digest buffer, new pw */
};
int ret;
/*
* Fill the command structure starting from the first buffer:
* - the old password (if any)
* - size of the new password
* - new password
*/
ret = pack_byte_string(command_v2, sizeof(command_v2), "sws",
offset, oldpw, oldpw_sz,
offset + oldpw_sz, newpw_sz,
offset + oldpw_sz + 2, newpw, newpw_sz);
offset += oldpw_sz + 2 + newpw_sz;
if (ret)
return TPM_LIB_ERROR;
return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}
u32 tpm2_pcr_setauthpolicy(struct udevice *dev, const char *pw,
const ssize_t pw_sz, u32 index, const char *key)
{
u8 command_v2[COMMAND_BUFFER_SIZE] = {
tpm_u16(TPM2_ST_SESSIONS), /* TAG */
tpm_u32(35 + pw_sz + TPM2_DIGEST_LEN), /* Length */
tpm_u32(TPM2_CC_PCR_SETAUTHPOL), /* Command code */
/* HANDLE */
tpm_u32(TPM2_RH_PLATFORM), /* TPM resource handle */
/* AUTH_SESSION */
tpm_u32(9 + pw_sz), /* Authorization size */
tpm_u32(TPM2_RS_PW), /* session handle */
tpm_u16(0), /* Size of <nonce> */
/* <nonce> (if any) */
0, /* Attributes: Cont/Excl/Rst */
tpm_u16(pw_sz) /* Size of <hmac/password> */
/* STRING(pw) <hmac/password> (if any) */
/* TPM2B_AUTH (TPM2B_DIGEST) */
/* tpm_u16(TPM2_DIGEST_LEN) Digest size length */
/* STRING(key) Digest buffer (PCR key) */
/* TPMI_ALG_HASH */
/* tpm_u16(TPM2_ALG_SHA256) Algorithm of the hash */
/* TPMI_DH_PCR */
/* tpm_u32(index), PCR Index */
};
unsigned int offset = 27;
int ret;
/*
* Fill the command structure starting from the first buffer:
* - the password (if any)
* - the PCR key length
* - the PCR key
* - the hash algorithm
* - the PCR index
*/
ret = pack_byte_string(command_v2, sizeof(command_v2), "swswd",
offset, pw, pw_sz,
offset + pw_sz, TPM2_DIGEST_LEN,
offset + pw_sz + 2, key, TPM2_DIGEST_LEN,
offset + pw_sz + 2 + TPM2_DIGEST_LEN,
TPM2_ALG_SHA256,
offset + pw_sz + 4 + TPM2_DIGEST_LEN, index);
offset += pw_sz + 2 + TPM2_DIGEST_LEN + 2 + 4;
if (ret)
return TPM_LIB_ERROR;
return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}
u32 tpm2_pcr_setauthvalue(struct udevice *dev, const char *pw,
const ssize_t pw_sz, u32 index, const char *key,
const ssize_t key_sz)
{
u8 command_v2[COMMAND_BUFFER_SIZE] = {
tpm_u16(TPM2_ST_SESSIONS), /* TAG */
tpm_u32(33 + pw_sz + TPM2_DIGEST_LEN), /* Length */
tpm_u32(TPM2_CC_PCR_SETAUTHVAL), /* Command code */
/* HANDLE */
tpm_u32(index), /* Handle (PCR Index) */
/* AUTH_SESSION */
tpm_u32(9 + pw_sz), /* Authorization size */
tpm_u32(TPM2_RS_PW), /* session handle */
tpm_u16(0), /* Size of <nonce> */
/* <nonce> (if any) */
0, /* Attributes: Cont/Excl/Rst */
tpm_u16(pw_sz), /* Size of <hmac/password> */
/* STRING(pw) <hmac/password> (if any) */
/* TPM2B_DIGEST */
/* tpm_u16(key_sz) Key length */
/* STRING(key) Key */
};
unsigned int offset = 27;
int ret;
/*
* Fill the command structure starting from the first buffer:
* - the password (if any)
* - the number of digests, 1 in our case
* - the algorithm, sha256 in our case
* - the digest (64 bytes)
*/
ret = pack_byte_string(command_v2, sizeof(command_v2), "sws",
offset, pw, pw_sz,
offset + pw_sz, key_sz,
offset + pw_sz + 2, key, key_sz);
offset += pw_sz + 2 + key_sz;
if (ret)
return TPM_LIB_ERROR;
return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}
u32 tpm2_get_random(struct udevice *dev, void *data, u32 count)
{
const u8 command_v2[10] = {
tpm_u16(TPM2_ST_NO_SESSIONS),
tpm_u32(12),
tpm_u32(TPM2_CC_GET_RANDOM),
};
u8 buf[COMMAND_BUFFER_SIZE], response[COMMAND_BUFFER_SIZE];
const size_t data_size_offset = 10;
const size_t data_offset = 12;
size_t response_length = sizeof(response);
u32 data_size;
u8 *out = data;
while (count > 0) {
u32 this_bytes = min((size_t)count,
sizeof(response) - data_offset);
u32 err;
if (pack_byte_string(buf, sizeof(buf), "sw",
0, command_v2, sizeof(command_v2),
sizeof(command_v2), this_bytes))
return TPM_LIB_ERROR;
err = tpm_sendrecv_command(dev, buf, response,
&response_length);
if (err)
return err;
if (unpack_byte_string(response, response_length, "w",
data_size_offset, &data_size))
return TPM_LIB_ERROR;
if (data_size > this_bytes)
return TPM_LIB_ERROR;
if (unpack_byte_string(response, response_length, "s",
data_offset, out, data_size))
return TPM_LIB_ERROR;
count -= data_size;
out += data_size;
}
return 0;
}
u32 tpm2_write_lock(struct udevice *dev, u32 index)
{
u8 command_v2[COMMAND_BUFFER_SIZE] = {
/* header 10 bytes */
tpm_u16(TPM2_ST_SESSIONS), /* TAG */
tpm_u32(10 + 8 + 13), /* Length */
tpm_u32(TPM2_CC_NV_WRITELOCK), /* Command code */
/* handles 8 bytes */
tpm_u32(TPM2_RH_PLATFORM), /* Primary platform seed */
tpm_u32(HR_NV_INDEX + index), /* Password authorisation */
/* session header 9 bytes */
tpm_u32(9), /* Header size */
tpm_u32(TPM2_RS_PW), /* Password authorisation */
tpm_u16(0), /* nonce_size */
0, /* session_attrs */
tpm_u16(0), /* auth_size */
};
return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}
u32 tpm2_disable_platform_hierarchy(struct udevice *dev)
{
struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
u8 command_v2[COMMAND_BUFFER_SIZE] = {
/* header 10 bytes */
tpm_u16(TPM2_ST_SESSIONS), /* TAG */
tpm_u32(10 + 4 + 13 + 5), /* Length */
tpm_u32(TPM2_CC_HIER_CONTROL), /* Command code */
/* 4 bytes */
tpm_u32(TPM2_RH_PLATFORM), /* Primary platform seed */
/* session header 9 bytes */
tpm_u32(9), /* Header size */
tpm_u32(TPM2_RS_PW), /* Password authorisation */
tpm_u16(0), /* nonce_size */
0, /* session_attrs */
tpm_u16(0), /* auth_size */
/* payload 5 bytes */
tpm_u32(TPM2_RH_PLATFORM), /* Hierarchy to disable */
0, /* 0=disable */
};
int ret;
ret = tpm_sendrecv_command(dev, command_v2, NULL, NULL);
log_info("ret=%s, %x\n", dev->name, ret);
if (ret)
return ret;
priv->plat_hier_disabled = true;
return 0;
}
u32 tpm2_submit_command(struct udevice *dev, const u8 *sendbuf,
u8 *recvbuf, size_t *recv_size)
{
return tpm_sendrecv_command(dev, sendbuf, recvbuf, recv_size);
}
u32 tpm2_report_state(struct udevice *dev, uint vendor_cmd, uint vendor_subcmd,
u8 *recvbuf, size_t *recv_size)
{
u8 command_v2[COMMAND_BUFFER_SIZE] = {
/* header 10 bytes */
tpm_u16(TPM2_ST_NO_SESSIONS), /* TAG */
tpm_u32(10 + 2), /* Length */
tpm_u32(vendor_cmd), /* Command code */
tpm_u16(vendor_subcmd),
};
int ret;
ret = tpm_sendrecv_command(dev, command_v2, recvbuf, recv_size);
log_debug("ret=%s, %x\n", dev->name, ret);
if (ret)
return ret;
if (*recv_size < 12)
return -ENODATA;
*recv_size -= 12;
memcpy(recvbuf, recvbuf + 12, *recv_size);
return 0;
}
u32 tpm2_enable_nvcommits(struct udevice *dev, uint vendor_cmd,
uint vendor_subcmd)
{
u8 command_v2[COMMAND_BUFFER_SIZE] = {
/* header 10 bytes */
tpm_u16(TPM2_ST_NO_SESSIONS), /* TAG */
tpm_u32(10 + 2), /* Length */
tpm_u32(vendor_cmd), /* Command code */
tpm_u16(vendor_subcmd),
};
int ret;
ret = tpm_sendrecv_command(dev, command_v2, NULL, NULL);
log_debug("ret=%s, %x\n", dev->name, ret);
if (ret)
return ret;
return 0;
}