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tpm: move TPM space code out of tpm_transmit() 

Prepare and commit TPM space before and after calling tpm_transmit()
instead of doing that inside tpm_transmit(). After this change we can
remove TPM_TRANSMIT_NESTED flag from tpm2_prepare_space() and
tpm2_commit_space() and replace it with TPM_TRANSMIT_UNLOCKED.

Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Tested-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Reviewed-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Tested-by: Alexander Steffen <Alexander.Steffen@infineon.com>
This commit is contained in:
Jarkko Sakkinen 2018-11-03 05:22:36 +02:00
parent c3465a370f
commit 29b47ce987
3 changed files with 34 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/char/tpm/tpm-dev-common.c
View File

@ -30,13 +30,35 @@ static DEFINE_MUTEX(tpm_dev_wq_lock);
static ssize_t tpm_dev_transmit(struct tpm_chip *chip, struct tpm_space *space,
u8 *buf, size_t bufsiz)
{
ssize_t ret;
struct tpm_header *header = (void *)buf;
ssize_t ret, len;
mutex_lock(&chip->tpm_mutex);
ret = tpm_transmit(chip, space, buf, bufsiz, TPM_TRANSMIT_UNLOCKED);
ret = tpm2_prepare_space(chip, space, buf, bufsiz);
/* If the command is not implemented by the TPM, synthesize a
* response with a TPM2_RC_COMMAND_CODE return for user-space.
*/
if (ret == -EOPNOTSUPP) {
header->length = cpu_to_be32(sizeof(*header));
header->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS);
header->return_code = cpu_to_be32(TPM2_RC_COMMAND_CODE |
TSS2_RESMGR_TPM_RC_LAYER);
ret = sizeof(*header);
}
if (ret)
goto out_lock;
len = tpm_transmit(chip, space, buf, bufsiz, TPM_TRANSMIT_UNLOCKED);
if (len < 0)
ret = len;
if (!ret)
ret = tpm2_commit_space(chip, space, buf, &len);
out_lock:
mutex_unlock(&chip->tpm_mutex);
return ret;
return ret ? ret : len;
}
static void tpm_dev_async_work(struct work_struct *work)

27
drivers/char/tpm/tpm-interface.c
View File

@ -145,27 +145,12 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, struct tpm_space *space,
return -E2BIG;
}
rc = tpm2_prepare_space(chip, space, buf, bufsiz);
/*
* If the command is not implemented by the TPM, synthesize a
* response with a TPM2_RC_COMMAND_CODE return for user-space.
*/
if (rc == -EOPNOTSUPP) {
header->length = cpu_to_be32(sizeof(*header));
header->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS);
header->return_code = cpu_to_be32(TPM2_RC_COMMAND_CODE |
TSS2_RESMGR_TPM_RC_LAYER);
return sizeof(*header);
}
if (rc)
return rc;
rc = chip->ops->send(chip, buf, count);
if (rc < 0) {
if (rc != -EPIPE)
dev_err(&chip->dev,
"%s: send(): error %d\n", __func__, rc);
goto out_rc;
return rc;
}
/* A sanity check. send() should just return zero on success e.g.
@ -189,8 +174,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, struct tpm_space *space,
if (chip->ops->req_canceled(chip, status)) {
dev_err(&chip->dev, "Operation Canceled\n");
rc = -ECANCELED;
goto out_rc;
return -ECANCELED;
}
tpm_msleep(TPM_TIMEOUT_POLL);
@ -199,8 +183,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, struct tpm_space *space,
chip->ops->cancel(chip);
dev_err(&chip->dev, "Operation Timed out\n");
rc = -ETIME;
goto out_rc;
return -ETIME;
out_recv:
len = chip->ops->recv(chip, buf, bufsiz);
@ -210,10 +193,6 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, struct tpm_space *space,
} else if (len < TPM_HEADER_SIZE || len != be32_to_cpu(header->length))
rc = -EFAULT;
out_rc:
if (!rc)
rc = tpm2_commit_space(chip, space, buf, &len);
return rc ? rc : len;
}

12
drivers/char/tpm/tpm2-space.c
View File

@ -39,7 +39,7 @@ static void tpm2_flush_sessions(struct tpm_chip *chip, struct tpm_space *space)
for (i = 0; i < ARRAY_SIZE(space->session_tbl); i++) {
if (space->session_tbl[i])
tpm2_flush_context_cmd(chip, space->session_tbl[i],
TPM_TRANSMIT_NESTED);
TPM_TRANSMIT_UNLOCKED);
}
}
@ -84,7 +84,7 @@ static int tpm2_load_context(struct tpm_chip *chip, u8 *buf,
tpm_buf_append(&tbuf, &buf[*offset], body_size);
rc = tpm_transmit_cmd(chip, NULL, &tbuf, 4,
TPM_TRANSMIT_NESTED, NULL);
TPM_TRANSMIT_UNLOCKED, NULL);
if (rc < 0) {
dev_warn(&chip->dev, "%s: failed with a system error %d\n",
__func__, rc);
@ -133,7 +133,7 @@ static int tpm2_save_context(struct tpm_chip *chip, u32 handle, u8 *buf,
tpm_buf_append_u32(&tbuf, handle);
rc = tpm_transmit_cmd(chip, NULL, &tbuf, 0,
TPM_TRANSMIT_NESTED, NULL);
TPM_TRANSMIT_UNLOCKED, NULL);
if (rc < 0) {
dev_warn(&chip->dev, "%s: failed with a system error %d\n",
__func__, rc);
@ -170,7 +170,7 @@ void tpm2_flush_space(struct tpm_chip *chip)
for (i = 0; i < ARRAY_SIZE(space->context_tbl); i++)
if (space->context_tbl[i] && ~space->context_tbl[i])
tpm2_flush_context_cmd(chip, space->context_tbl[i],
TPM_TRANSMIT_NESTED);
TPM_TRANSMIT_UNLOCKED);
tpm2_flush_sessions(chip, space);
}
@ -418,7 +418,7 @@ static int tpm2_map_response_header(struct tpm_chip *chip, u32 cc, u8 *rsp,
return 0;
out_no_slots:
tpm2_flush_context_cmd(chip, phandle, TPM_TRANSMIT_NESTED);
tpm2_flush_context_cmd(chip, phandle, TPM_TRANSMIT_UNLOCKED);
dev_warn(&chip->dev, "%s: out of slots for 0x%08X\n", __func__,
phandle);
return -ENOMEM;
@ -506,7 +506,7 @@ static int tpm2_save_space(struct tpm_chip *chip)
return rc;
tpm2_flush_context_cmd(chip, space->context_tbl[i],
TPM_TRANSMIT_NESTED);
TPM_TRANSMIT_UNLOCKED);
space->context_tbl[i] = ~0;
}