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tpm: cmd_ready command can be issued only after granting locality

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The correct sequence is to first request locality and only after
that perform cmd_ready handshake, otherwise the hardware will drop
the subsequent message as from the device point of view the cmd_ready
handshake wasn't performed. Symmetrically locality has to be relinquished
only after going idle handshake has completed, this requires that
go_idle has to poll for the completion and as well locality
relinquish has to poll for completion so it is not overridden
in back to back commands flow.

Two wrapper functions are added (request_locality relinquish_locality)
to simplify the error handling.

The issue is only visible on devices that support multiple localities.

Fixes: 877c57d0d0 ("tpm_crb: request and relinquish locality 0")
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkine@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkine@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkine@linux.intel.com>
This commit is contained in:
Tomas Winkler 2018-03-05 13:34:49 +02:00 committed by Jarkko Sakkinen
parent 5893ed18a2
commit 888d867df4
4 changed files with 129 additions and 57 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
drivers/char/tpm/tpm-interface.c
View File

@ -369,6 +369,36 @@ err_len:
return -EINVAL;
}
static int tpm_request_locality(struct tpm_chip *chip)
{
int rc;
if (!chip->ops->request_locality)
return 0;
rc = chip->ops->request_locality(chip, 0);
if (rc < 0)
return rc;
chip->locality = rc;
return 0;
}
static void tpm_relinquish_locality(struct tpm_chip *chip)
{
int rc;
if (!chip->ops->relinquish_locality)
return;
rc = chip->ops->relinquish_locality(chip, chip->locality);
if (rc)
dev_err(&chip->dev, "%s: : error %d\n", __func__, rc);
chip->locality = -1;
}
/**
* tmp_transmit - Internal kernel interface to transmit TPM commands.
*
@ -422,8 +452,6 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
if (!(flags & TPM_TRANSMIT_UNLOCKED))
mutex_lock(&chip->tpm_mutex);
if (chip->dev.parent)
pm_runtime_get_sync(chip->dev.parent);
if (chip->ops->clk_enable != NULL)
chip->ops->clk_enable(chip, true);
@ -431,14 +459,15 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
/* Store the decision as chip->locality will be changed. */
need_locality = chip->locality == -1;
if (!(flags & TPM_TRANSMIT_RAW) &&
need_locality && chip->ops->request_locality) {
rc = chip->ops->request_locality(chip, 0);
if (!(flags & TPM_TRANSMIT_RAW) && need_locality) {
rc = tpm_request_locality(chip);
if (rc < 0)
goto out_no_locality;
chip->locality = rc;
}
if (chip->dev.parent)
pm_runtime_get_sync(chip->dev.parent);
rc = tpm2_prepare_space(chip, space, ordinal, buf);
if (rc)
goto out;
@ -499,17 +528,16 @@ out_recv:
rc = tpm2_commit_space(chip, space, ordinal, buf, &len);
out:
if (need_locality && chip->ops->relinquish_locality) {
chip->ops->relinquish_locality(chip, chip->locality);
chip->locality = -1;
}
if (chip->dev.parent)
pm_runtime_put_sync(chip->dev.parent);
if (need_locality)
tpm_relinquish_locality(chip);
out_no_locality:
if (chip->ops->clk_enable != NULL)
chip->ops->clk_enable(chip, false);
if (chip->dev.parent)
pm_runtime_put_sync(chip->dev.parent);
if (!(flags & TPM_TRANSMIT_UNLOCKED))
mutex_unlock(&chip->tpm_mutex);
return rc ? rc : len;

126
drivers/char/tpm/tpm_crb.c
View File

@ -112,35 +112,6 @@ struct tpm2_crb_smc {
u32 smc_func_id;
};
/**
* crb_go_idle - request tpm crb device to go the idle state
*
* @dev: crb device
* @priv: crb private data
*
* Write CRB_CTRL_REQ_GO_IDLE to TPM_CRB_CTRL_REQ
* The device should respond within TIMEOUT_C by clearing the bit.
* Anyhow, we do not wait here as a consequent CMD_READY request
* will be handled correctly even if idle was not completed.
*
* The function does nothing for devices with ACPI-start method
* or SMC-start method.
*
* Return: 0 always
*/
static int __maybe_unused crb_go_idle(struct device *dev, struct crb_priv *priv)
{
if ((priv->sm == ACPI_TPM2_START_METHOD) ||
(priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD) ||
(priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC))
return 0;
iowrite32(CRB_CTRL_REQ_GO_IDLE, &priv->regs_t->ctrl_req);
/* we don't really care when this settles */
return 0;
}
static bool crb_wait_for_reg_32(u32 __iomem *reg, u32 mask, u32 value,
unsigned long timeout)
{
@ -157,7 +128,42 @@ static bool crb_wait_for_reg_32(u32 __iomem *reg, u32 mask, u32 value,
usleep_range(50, 100);
} while (ktime_before(ktime_get(), stop));
return false;
return ((ioread32(reg) & mask) == value);
}
/**
* crb_go_idle - request tpm crb device to go the idle state
*
* @dev: crb device
* @priv: crb private data
*
* Write CRB_CTRL_REQ_GO_IDLE to TPM_CRB_CTRL_REQ
* The device should respond within TIMEOUT_C by clearing the bit.
* Anyhow, we do not wait here as a consequent CMD_READY request
* will be handled correctly even if idle was not completed.
*
* The function does nothing for devices with ACPI-start method
* or SMC-start method.
*
* Return: 0 always
*/
static int crb_go_idle(struct device *dev, struct crb_priv *priv)
{
if ((priv->sm == ACPI_TPM2_START_METHOD) ||
(priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD) ||
(priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC))
return 0;
iowrite32(CRB_CTRL_REQ_GO_IDLE, &priv->regs_t->ctrl_req);
if (!crb_wait_for_reg_32(&priv->regs_t->ctrl_req,
CRB_CTRL_REQ_GO_IDLE/* mask */,
0, /* value */
TPM2_TIMEOUT_C)) {
dev_warn(dev, "goIdle timed out\n");
return -ETIME;
}
return 0;
}
/**
@ -175,8 +181,7 @@ static bool crb_wait_for_reg_32(u32 __iomem *reg, u32 mask, u32 value,
*
* Return: 0 on success -ETIME on timeout;
*/
static int __maybe_unused crb_cmd_ready(struct device *dev,
struct crb_priv *priv)
static int crb_cmd_ready(struct device *dev, struct crb_priv *priv)
{
if ((priv->sm == ACPI_TPM2_START_METHOD) ||
(priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD) ||
@ -195,11 +200,11 @@ static int __maybe_unused crb_cmd_ready(struct device *dev,
return 0;
}
static int crb_request_locality(struct tpm_chip *chip, int loc)
static int __crb_request_locality(struct device *dev,
struct crb_priv *priv, int loc)
{
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
u32 value = CRB_LOC_STATE_LOC_ASSIGNED |
CRB_LOC_STATE_TPM_REG_VALID_STS;
CRB_LOC_STATE_TPM_REG_VALID_STS;
if (!priv->regs_h)
return 0;
@ -207,21 +212,45 @@ static int crb_request_locality(struct tpm_chip *chip, int loc)
iowrite32(CRB_LOC_CTRL_REQUEST_ACCESS, &priv->regs_h->loc_ctrl);
if (!crb_wait_for_reg_32(&priv->regs_h->loc_state, value, value,
TPM2_TIMEOUT_C)) {
dev_warn(&chip->dev, "TPM_LOC_STATE_x.requestAccess timed out\n");
dev_warn(dev, "TPM_LOC_STATE_x.requestAccess timed out\n");
return -ETIME;
}
return 0;
}
static void crb_relinquish_locality(struct tpm_chip *chip, int loc)
static int crb_request_locality(struct tpm_chip *chip, int loc)
{
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
return __crb_request_locality(&chip->dev, priv, loc);
}
static int __crb_relinquish_locality(struct device *dev,
struct crb_priv *priv, int loc)
{
u32 mask = CRB_LOC_STATE_LOC_ASSIGNED |
CRB_LOC_STATE_TPM_REG_VALID_STS;
u32 value = CRB_LOC_STATE_TPM_REG_VALID_STS;
if (!priv->regs_h)
return;
return 0;
iowrite32(CRB_LOC_CTRL_RELINQUISH, &priv->regs_h->loc_ctrl);
if (!crb_wait_for_reg_32(&priv->regs_h->loc_state, mask, value,
TPM2_TIMEOUT_C)) {
dev_warn(dev, "TPM_LOC_STATE_x.requestAccess timed out\n");
return -ETIME;
}
return 0;
}
static int crb_relinquish_locality(struct tpm_chip *chip, int loc)
{
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
return __crb_relinquish_locality(&chip->dev, priv, loc);
}
static u8 crb_status(struct tpm_chip *chip)
@ -475,6 +504,10 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
dev_warn(dev, FW_BUG "Bad ACPI memory layout");
}
ret = __crb_request_locality(dev, priv, 0);
if (ret)
return ret;
priv->regs_t = crb_map_res(dev, priv, &io_res, buf->control_address,
sizeof(struct crb_regs_tail));
if (IS_ERR(priv->regs_t))
@ -531,6 +564,8 @@ out:
crb_go_idle(dev, priv);
__crb_relinquish_locality(dev, priv, 0);
return ret;
}
@ -588,10 +623,14 @@ static int crb_acpi_add(struct acpi_device *device)
chip->acpi_dev_handle = device->handle;
chip->flags = TPM_CHIP_FLAG_TPM2;
rc = crb_cmd_ready(dev, priv);
rc = __crb_request_locality(dev, priv, 0);
if (rc)
return rc;
rc = crb_cmd_ready(dev, priv);
if (rc)
goto out;
pm_runtime_get_noresume(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
@ -601,12 +640,15 @@ static int crb_acpi_add(struct acpi_device *device)
crb_go_idle(dev, priv);
pm_runtime_put_noidle(dev);
pm_runtime_disable(dev);
return rc;
goto out;
}
pm_runtime_put(dev);
pm_runtime_put_sync(dev);
return 0;
out:
__crb_relinquish_locality(dev, priv, 0);
return rc;
}
static int crb_acpi_remove(struct acpi_device *device)

4
drivers/char/tpm/tpm_tis_core.c
View File

@ -143,11 +143,13 @@ static bool check_locality(struct tpm_chip *chip, int l)
return false;
}
static void release_locality(struct tpm_chip *chip, int l)
static int release_locality(struct tpm_chip *chip, int l)
{
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
tpm_tis_write8(priv, TPM_ACCESS(l), TPM_ACCESS_ACTIVE_LOCALITY);
return 0;
}
static int request_locality(struct tpm_chip *chip, int l)

2
include/linux/tpm.h
View File

@ -44,7 +44,7 @@ struct tpm_class_ops {
bool (*update_timeouts)(struct tpm_chip *chip,
unsigned long *timeout_cap);
int (*request_locality)(struct tpm_chip *chip, int loc);
void (*relinquish_locality)(struct tpm_chip *chip, int loc);
int (*relinquish_locality)(struct tpm_chip *chip, int loc);
void (*clk_enable)(struct tpm_chip *chip, bool value);
};