| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (C) 2004 IBM Corporation |
| * Copyright (C) 2014 Intel Corporation |
| * |
| * Authors: |
| * Leendert van Doorn <leendert@watson.ibm.com> |
| * Dave Safford <safford@watson.ibm.com> |
| * Reiner Sailer <sailer@watson.ibm.com> |
| * Kylene Hall <kjhall@us.ibm.com> |
| * |
| * Device driver for TCG/TCPA TPM (trusted platform module). |
| * Specifications at www.trustedcomputinggroup.org |
| */ |
| |
| #include <linux/poll.h> |
| #include <linux/slab.h> |
| #include <linux/mutex.h> |
| #include <linux/spinlock.h> |
| #include <linux/freezer.h> |
| #include <linux/tpm_eventlog.h> |
| |
| #include "tpm.h" |
| |
| #define TPM_MAX_ORDINAL 243 |
| |
| /* |
| * Array with one entry per ordinal defining the maximum amount |
| * of time the chip could take to return the result. The ordinal |
| * designation of short, medium or long is defined in a table in |
| * TCG Specification TPM Main Part 2 TPM Structures Section 17. The |
| * values of the SHORT, MEDIUM, and LONG durations are retrieved |
| * from the chip during initialization with a call to tpm_get_timeouts. |
| */ |
| static const u8 tpm1_ordinal_duration[TPM_MAX_ORDINAL] = { |
| TPM_UNDEFINED, /* 0 */ |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, /* 5 */ |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_SHORT, /* 10 */ |
| TPM_SHORT, |
| TPM_MEDIUM, |
| TPM_LONG, |
| TPM_LONG, |
| TPM_MEDIUM, /* 15 */ |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_MEDIUM, |
| TPM_LONG, |
| TPM_SHORT, /* 20 */ |
| TPM_SHORT, |
| TPM_MEDIUM, |
| TPM_MEDIUM, |
| TPM_MEDIUM, |
| TPM_SHORT, /* 25 */ |
| TPM_SHORT, |
| TPM_MEDIUM, |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_MEDIUM, /* 30 */ |
| TPM_LONG, |
| TPM_MEDIUM, |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_SHORT, /* 35 */ |
| TPM_MEDIUM, |
| TPM_MEDIUM, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_MEDIUM, /* 40 */ |
| TPM_LONG, |
| TPM_MEDIUM, |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_SHORT, /* 45 */ |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_LONG, |
| TPM_MEDIUM, /* 50 */ |
| TPM_MEDIUM, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, /* 55 */ |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_MEDIUM, /* 60 */ |
| TPM_MEDIUM, |
| TPM_MEDIUM, |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_MEDIUM, /* 65 */ |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_SHORT, /* 70 */ |
| TPM_SHORT, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, /* 75 */ |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_LONG, /* 80 */ |
| TPM_UNDEFINED, |
| TPM_MEDIUM, |
| TPM_LONG, |
| TPM_SHORT, |
| TPM_UNDEFINED, /* 85 */ |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_SHORT, /* 90 */ |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_UNDEFINED, /* 95 */ |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_MEDIUM, /* 100 */ |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, /* 105 */ |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_SHORT, /* 110 */ |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_SHORT, /* 115 */ |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_LONG, /* 120 */ |
| TPM_LONG, |
| TPM_MEDIUM, |
| TPM_UNDEFINED, |
| TPM_SHORT, |
| TPM_SHORT, /* 125 */ |
| TPM_SHORT, |
| TPM_LONG, |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_SHORT, /* 130 */ |
| TPM_MEDIUM, |
| TPM_UNDEFINED, |
| TPM_SHORT, |
| TPM_MEDIUM, |
| TPM_UNDEFINED, /* 135 */ |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_SHORT, /* 140 */ |
| TPM_SHORT, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, /* 145 */ |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_SHORT, /* 150 */ |
| TPM_MEDIUM, |
| TPM_MEDIUM, |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_UNDEFINED, /* 155 */ |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_SHORT, /* 160 */ |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, /* 165 */ |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_LONG, /* 170 */ |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, /* 175 */ |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_MEDIUM, /* 180 */ |
| TPM_SHORT, |
| TPM_MEDIUM, |
| TPM_MEDIUM, |
| TPM_MEDIUM, |
| TPM_MEDIUM, /* 185 */ |
| TPM_SHORT, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, /* 190 */ |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, /* 195 */ |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_SHORT, /* 200 */ |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_SHORT, |
| TPM_SHORT, /* 205 */ |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_MEDIUM, /* 210 */ |
| TPM_UNDEFINED, |
| TPM_MEDIUM, |
| TPM_MEDIUM, |
| TPM_MEDIUM, |
| TPM_UNDEFINED, /* 215 */ |
| TPM_MEDIUM, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_SHORT, |
| TPM_SHORT, /* 220 */ |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_SHORT, |
| TPM_UNDEFINED, /* 225 */ |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_SHORT, /* 230 */ |
| TPM_LONG, |
| TPM_MEDIUM, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, /* 235 */ |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_UNDEFINED, |
| TPM_SHORT, /* 240 */ |
| TPM_UNDEFINED, |
| TPM_MEDIUM, |
| }; |
| |
| /** |
| * tpm1_calc_ordinal_duration() - calculate the maximum command duration |
| * @chip: TPM chip to use. |
| * @ordinal: TPM command ordinal. |
| * |
| * The function returns the maximum amount of time the chip could take |
| * to return the result for a particular ordinal in jiffies. |
| * |
| * Return: A maximal duration time for an ordinal in jiffies. |
| */ |
| unsigned long tpm1_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal) |
| { |
| int duration_idx = TPM_UNDEFINED; |
| int duration = 0; |
| |
| /* |
| * We only have a duration table for protected commands, where the upper |
| * 16 bits are 0. For the few other ordinals the fallback will be used. |
| */ |
| if (ordinal < TPM_MAX_ORDINAL) |
| duration_idx = tpm1_ordinal_duration[ordinal]; |
| |
| if (duration_idx != TPM_UNDEFINED) |
| duration = chip->duration[duration_idx]; |
| if (duration <= 0) |
| return 2 * 60 * HZ; |
| else |
| return duration; |
| } |
| |
| #define TPM_ORD_STARTUP 153 |
| #define TPM_ST_CLEAR 1 |
| |
| /** |
| * tpm_startup() - turn on the TPM |
| * @chip: TPM chip to use |
| * |
| * Normally the firmware should start the TPM. This function is provided as a |
| * workaround if this does not happen. A legal case for this could be for |
| * example when a TPM emulator is used. |
| * |
| * Return: same as tpm_transmit_cmd() |
| */ |
| static int tpm1_startup(struct tpm_chip *chip) |
| { |
| struct tpm_buf buf; |
| int rc; |
| |
| dev_info(&chip->dev, "starting up the TPM manually\n"); |
| |
| rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_STARTUP); |
| if (rc < 0) |
| return rc; |
| |
| tpm_buf_append_u16(&buf, TPM_ST_CLEAR); |
| |
| rc = tpm_transmit_cmd(chip, &buf, 0, "attempting to start the TPM"); |
| tpm_buf_destroy(&buf); |
| return rc; |
| } |
| |
| int tpm1_get_timeouts(struct tpm_chip *chip) |
| { |
| cap_t cap; |
| unsigned long timeout_old[4], timeout_chip[4], timeout_eff[4]; |
| ssize_t rc; |
| |
| rc = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, NULL, |
| sizeof(cap.timeout)); |
| if (rc == TPM_ERR_INVALID_POSTINIT) { |
| if (tpm1_startup(chip)) |
| return rc; |
| |
| rc = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, |
| "attempting to determine the timeouts", |
| sizeof(cap.timeout)); |
| } |
| |
| if (rc) { |
| dev_err(&chip->dev, "A TPM error (%zd) occurred attempting to determine the timeouts\n", |
| rc); |
| return rc; |
| } |
| |
| timeout_old[0] = jiffies_to_usecs(chip->timeout_a); |
| timeout_old[1] = jiffies_to_usecs(chip->timeout_b); |
| timeout_old[2] = jiffies_to_usecs(chip->timeout_c); |
| timeout_old[3] = jiffies_to_usecs(chip->timeout_d); |
| timeout_chip[0] = be32_to_cpu(cap.timeout.a); |
| timeout_chip[1] = be32_to_cpu(cap.timeout.b); |
| timeout_chip[2] = be32_to_cpu(cap.timeout.c); |
| timeout_chip[3] = be32_to_cpu(cap.timeout.d); |
| memcpy(timeout_eff, timeout_chip, sizeof(timeout_eff)); |
| |
| /* |
| * Provide ability for vendor overrides of timeout values in case |
| * of misreporting. |
| */ |
| if (chip->ops->update_timeouts) |
| chip->ops->update_timeouts(chip, timeout_eff); |
| |
| if (!chip->timeout_adjusted) { |
| /* Restore default if chip reported 0 */ |
| unsigned int i; |
| |
| for (i = 0; i < ARRAY_SIZE(timeout_eff); i++) { |
| if (timeout_eff[i]) |
| continue; |
| |
| timeout_eff[i] = timeout_old[i]; |
| chip->timeout_adjusted = true; |
| } |
| |
| if (timeout_eff[0] != 0 && timeout_eff[0] < 1000) { |
| /* timeouts in msec rather usec */ |
| for (i = 0; i != ARRAY_SIZE(timeout_eff); i++) |
| timeout_eff[i] *= 1000; |
| chip->timeout_adjusted = true; |
| } |
| } |
| |
| /* Report adjusted timeouts */ |
| if (chip->timeout_adjusted) { |
| dev_info(&chip->dev, HW_ERR "Adjusting reported timeouts: A %lu->%luus B %lu->%luus C %lu->%luus D %lu->%luus\n", |
| timeout_chip[0], timeout_eff[0], |
| timeout_chip[1], timeout_eff[1], |
| timeout_chip[2], timeout_eff[2], |
| timeout_chip[3], timeout_eff[3]); |
| } |
| |
| chip->timeout_a = usecs_to_jiffies(timeout_eff[0]); |
| chip->timeout_b = usecs_to_jiffies(timeout_eff[1]); |
| chip->timeout_c = usecs_to_jiffies(timeout_eff[2]); |
| chip->timeout_d = usecs_to_jiffies(timeout_eff[3]); |
| |
| rc = tpm1_getcap(chip, TPM_CAP_PROP_TIS_DURATION, &cap, |
| "attempting to determine the durations", |
| sizeof(cap.duration)); |
| if (rc) |
| return rc; |
| |
| chip->duration[TPM_SHORT] = |
| usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_short)); |
| chip->duration[TPM_MEDIUM] = |
| usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_medium)); |
| chip->duration[TPM_LONG] = |
| usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_long)); |
| chip->duration[TPM_LONG_LONG] = 0; /* not used under 1.2 */ |
| |
| /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above |
| * value wrong and apparently reports msecs rather than usecs. So we |
| * fix up the resulting too-small TPM_SHORT value to make things work. |
| * We also scale the TPM_MEDIUM and -_LONG values by 1000. |
| */ |
| if (chip->duration[TPM_SHORT] < (HZ / 100)) { |
| chip->duration[TPM_SHORT] = HZ; |
| chip->duration[TPM_MEDIUM] *= 1000; |
| chip->duration[TPM_LONG] *= 1000; |
| chip->duration_adjusted = true; |
| dev_info(&chip->dev, "Adjusting TPM timeout parameters."); |
| } |
| |
| chip->flags |= TPM_CHIP_FLAG_HAVE_TIMEOUTS; |
| return 0; |
| } |
| |
| #define TPM_ORD_PCR_EXTEND 20 |
| int tpm1_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, const u8 *hash, |
| const char *log_msg) |
| { |
| struct tpm_buf buf; |
| int rc; |
| |
| rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_PCR_EXTEND); |
| if (rc) |
| return rc; |
| |
| tpm_buf_append_u32(&buf, pcr_idx); |
| tpm_buf_append(&buf, hash, TPM_DIGEST_SIZE); |
| |
| rc = tpm_transmit_cmd(chip, &buf, TPM_DIGEST_SIZE, log_msg); |
| tpm_buf_destroy(&buf); |
| return rc; |
| } |
| |
| #define TPM_ORD_GET_CAP 101 |
| ssize_t tpm1_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap, |
| const char *desc, size_t min_cap_length) |
| { |
| struct tpm_buf buf; |
| int rc; |
| |
| rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_CAP); |
| if (rc) |
| return rc; |
| |
| if (subcap_id == TPM_CAP_VERSION_1_1 || |
| subcap_id == TPM_CAP_VERSION_1_2) { |
| tpm_buf_append_u32(&buf, subcap_id); |
| tpm_buf_append_u32(&buf, 0); |
| } else { |
| if (subcap_id == TPM_CAP_FLAG_PERM || |
| subcap_id == TPM_CAP_FLAG_VOL) |
| tpm_buf_append_u32(&buf, TPM_CAP_FLAG); |
| else |
| tpm_buf_append_u32(&buf, TPM_CAP_PROP); |
| |
| tpm_buf_append_u32(&buf, 4); |
| tpm_buf_append_u32(&buf, subcap_id); |
| } |
| rc = tpm_transmit_cmd(chip, &buf, min_cap_length, desc); |
| if (!rc) |
| *cap = *(cap_t *)&buf.data[TPM_HEADER_SIZE + 4]; |
| tpm_buf_destroy(&buf); |
| return rc; |
| } |
| EXPORT_SYMBOL_GPL(tpm1_getcap); |
| |
| #define TPM_ORD_GET_RANDOM 70 |
| struct tpm1_get_random_out { |
| __be32 rng_data_len; |
| u8 rng_data[TPM_MAX_RNG_DATA]; |
| } __packed; |
| |
| /** |
| * tpm1_get_random() - get random bytes from the TPM's RNG |
| * @chip: a &struct tpm_chip instance |
| * @dest: destination buffer for the random bytes |
| * @max: the maximum number of bytes to write to @dest |
| * |
| * Return: |
| * * number of bytes read |
| * * -errno or a TPM return code otherwise |
| */ |
| int tpm1_get_random(struct tpm_chip *chip, u8 *dest, size_t max) |
| { |
| struct tpm1_get_random_out *out; |
| u32 num_bytes = min_t(u32, max, TPM_MAX_RNG_DATA); |
| struct tpm_buf buf; |
| u32 total = 0; |
| int retries = 5; |
| u32 recd; |
| int rc; |
| |
| rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_RANDOM); |
| if (rc) |
| return rc; |
| |
| do { |
| tpm_buf_append_u32(&buf, num_bytes); |
| |
| rc = tpm_transmit_cmd(chip, &buf, sizeof(out->rng_data_len), |
| "attempting get random"); |
| if (rc) |
| goto out; |
| |
| out = (struct tpm1_get_random_out *)&buf.data[TPM_HEADER_SIZE]; |
| |
| recd = be32_to_cpu(out->rng_data_len); |
| if (recd > num_bytes) { |
| rc = -EFAULT; |
| goto out; |
| } |
| |
| if (tpm_buf_length(&buf) < TPM_HEADER_SIZE + |
| sizeof(out->rng_data_len) + recd) { |
| rc = -EFAULT; |
| goto out; |
| } |
| memcpy(dest, out->rng_data, recd); |
| |
| dest += recd; |
| total += recd; |
| num_bytes -= recd; |
| |
| tpm_buf_reset(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_RANDOM); |
| } while (retries-- && total < max); |
| |
| rc = total ? (int)total : -EIO; |
| out: |
| tpm_buf_destroy(&buf); |
| return rc; |
| } |
| |
| #define TPM_ORD_PCRREAD 21 |
| int tpm1_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf) |
| { |
| struct tpm_buf buf; |
| int rc; |
| |
| rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_PCRREAD); |
| if (rc) |
| return rc; |
| |
| tpm_buf_append_u32(&buf, pcr_idx); |
| |
| rc = tpm_transmit_cmd(chip, &buf, TPM_DIGEST_SIZE, |
| "attempting to read a pcr value"); |
| if (rc) |
| goto out; |
| |
| if (tpm_buf_length(&buf) < TPM_DIGEST_SIZE) { |
| rc = -EFAULT; |
| goto out; |
| } |
| |
| memcpy(res_buf, &buf.data[TPM_HEADER_SIZE], TPM_DIGEST_SIZE); |
| |
| out: |
| tpm_buf_destroy(&buf); |
| return rc; |
| } |
| |
| #define TPM_ORD_CONTINUE_SELFTEST 83 |
| /** |
| * tpm_continue_selftest() - run TPM's selftest |
| * @chip: TPM chip to use |
| * |
| * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing |
| * a TPM error code. |
| */ |
| static int tpm1_continue_selftest(struct tpm_chip *chip) |
| { |
| struct tpm_buf buf; |
| int rc; |
| |
| rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_CONTINUE_SELFTEST); |
| if (rc) |
| return rc; |
| |
| rc = tpm_transmit_cmd(chip, &buf, 0, "continue selftest"); |
| tpm_buf_destroy(&buf); |
| return rc; |
| } |
| |
| /** |
| * tpm1_do_selftest - have the TPM continue its selftest and wait until it |
| * can receive further commands |
| * @chip: TPM chip to use |
| * |
| * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing |
| * a TPM error code. |
| */ |
| int tpm1_do_selftest(struct tpm_chip *chip) |
| { |
| int rc; |
| unsigned int loops; |
| unsigned int delay_msec = 100; |
| unsigned long duration; |
| u8 dummy[TPM_DIGEST_SIZE]; |
| |
| duration = tpm1_calc_ordinal_duration(chip, TPM_ORD_CONTINUE_SELFTEST); |
| |
| loops = jiffies_to_msecs(duration) / delay_msec; |
| |
| rc = tpm1_continue_selftest(chip); |
| if (rc == TPM_ERR_INVALID_POSTINIT) { |
| chip->flags |= TPM_CHIP_FLAG_ALWAYS_POWERED; |
| dev_info(&chip->dev, "TPM not ready (%d)\n", rc); |
| } |
| /* This may fail if there was no TPM driver during a suspend/resume |
| * cycle; some may return 10 (BAD_ORDINAL), others 28 (FAILEDSELFTEST) |
| */ |
| if (rc) |
| return rc; |
| |
| do { |
| /* Attempt to read a PCR value */ |
| rc = tpm1_pcr_read(chip, 0, dummy); |
| |
| /* Some buggy TPMs will not respond to tpm_tis_ready() for |
| * around 300ms while the self test is ongoing, keep trying |
| * until the self test duration expires. |
| */ |
| if (rc == -ETIME) { |
| dev_info(&chip->dev, HW_ERR "TPM command timed out during continue self test"); |
| tpm_msleep(delay_msec); |
| continue; |
| } |
| |
| if (rc == TPM_ERR_DISABLED || rc == TPM_ERR_DEACTIVATED) { |
| dev_info(&chip->dev, "TPM is disabled/deactivated (0x%X)\n", |
| rc); |
| /* TPM is disabled and/or deactivated; driver can |
| * proceed and TPM does handle commands for |
| * suspend/resume correctly |
| */ |
| return 0; |
| } |
| if (rc != TPM_WARN_DOING_SELFTEST) |
| return rc; |
| tpm_msleep(delay_msec); |
| } while (--loops > 0); |
| |
| return rc; |
| } |
| EXPORT_SYMBOL_GPL(tpm1_do_selftest); |
| |
| /** |
| * tpm1_auto_startup - Perform the standard automatic TPM initialization |
| * sequence |
| * @chip: TPM chip to use |
| * |
| * Returns 0 on success, < 0 in case of fatal error. |
| */ |
| int tpm1_auto_startup(struct tpm_chip *chip) |
| { |
| int rc; |
| |
| rc = tpm1_get_timeouts(chip); |
| if (rc) |
| goto out; |
| rc = tpm1_do_selftest(chip); |
| if (rc) { |
| dev_err(&chip->dev, "TPM self test failed\n"); |
| goto out; |
| } |
| |
| chip->allocated_banks = kcalloc(1, sizeof(*chip->allocated_banks), |
| GFP_KERNEL); |
| if (!chip->allocated_banks) { |
| rc = -ENOMEM; |
| goto out; |
| } |
| |
| chip->allocated_banks[0].alg_id = TPM_ALG_SHA1; |
| chip->allocated_banks[0].digest_size = hash_digest_size[HASH_ALGO_SHA1]; |
| chip->allocated_banks[0].crypto_id = HASH_ALGO_SHA1; |
| chip->nr_allocated_banks = 1; |
| |
| return rc; |
| out: |
| if (rc > 0) |
| rc = -ENODEV; |
| return rc; |
| } |
| |
| #define TPM_ORD_SAVESTATE 152 |
| |
| /** |
| * tpm1_pm_suspend() - pm suspend handler |
| * @chip: TPM chip to use. |
| * @tpm_suspend_pcr: flush pcr for buggy TPM chips. |
| * |
| * The functions saves the TPM state to be restored on resume. |
| * |
| * Return: |
| * * 0 on success, |
| * * < 0 on error. |
| */ |
| int tpm1_pm_suspend(struct tpm_chip *chip, u32 tpm_suspend_pcr) |
| { |
| u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 }; |
| struct tpm_buf buf; |
| unsigned int try; |
| int rc; |
| |
| |
| /* for buggy tpm, flush pcrs with extend to selected dummy */ |
| if (tpm_suspend_pcr) |
| rc = tpm1_pcr_extend(chip, tpm_suspend_pcr, dummy_hash, |
| "extending dummy pcr before suspend"); |
| |
| rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_SAVESTATE); |
| if (rc) |
| return rc; |
| /* now do the actual savestate */ |
| for (try = 0; try < TPM_RETRY; try++) { |
| rc = tpm_transmit_cmd(chip, &buf, 0, NULL); |
| /* |
| * If the TPM indicates that it is too busy to respond to |
| * this command then retry before giving up. It can take |
| * several seconds for this TPM to be ready. |
| * |
| * This can happen if the TPM has already been sent the |
| * SaveState command before the driver has loaded. TCG 1.2 |
| * specification states that any communication after SaveState |
| * may cause the TPM to invalidate previously saved state. |
| */ |
| if (rc != TPM_WARN_RETRY) |
| break; |
| tpm_msleep(TPM_TIMEOUT_RETRY); |
| |
| tpm_buf_reset(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_SAVESTATE); |
| } |
| |
| if (rc) |
| dev_err(&chip->dev, "Error (%d) sending savestate before suspend\n", |
| rc); |
| else if (try > 0) |
| dev_warn(&chip->dev, "TPM savestate took %dms\n", |
| try * TPM_TIMEOUT_RETRY); |
| |
| tpm_buf_destroy(&buf); |
| |
| return rc; |
| } |
| |