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authorMaciej S. Szmigiero <mail@maciej.szmigiero.name>2017-01-13 22:37:00 +0100
committerJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>2017-01-23 18:28:18 +0200
commit1d70fe9d9c3a4c627f9757cbba5d628687b121c1 (patch)
tree9e8c8a9128f4cc68c5049a3aa353627feb0f6c0a /drivers/char
parent62bfdacbac4c5868862effbde8067c7582407190 (diff)
downloadlinux-1d70fe9d9c3a4c627f9757cbba5d628687b121c1.tar.bz2
tpm_tis: use default timeout value if chip reports it as zero
Since commit 1107d065fdf1 ("tpm_tis: Introduce intermediate layer for TPM access") Atmel 3203 TPM on ThinkPad X61S (TPM firmware version 13.9) no longer works. The initialization proceeds fine until we get and start using chip-reported timeouts - and the chip reports C and D timeouts of zero. It turns out that until commit 8e54caf407b98e ("tpm: Provide a generic means to override the chip returned timeouts") we had actually let default timeout values remain in this case, so let's bring back this behavior to make chips like Atmel 3203 work again. Use a common code that was introduced by that commit so a warning is printed in this case and /sys/class/tpm/tpm*/timeouts correctly says the timeouts aren't chip-original. Fixes: 1107d065fdf1 ("tpm_tis: Introduce intermediate layer for TPM access") Cc: stable@vger.kernel.org Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/tpm/tpm-interface.c53
-rw-r--r--drivers/char/tpm/tpm_tis.c2
-rw-r--r--drivers/char/tpm/tpm_tis_core.c6
-rw-r--r--drivers/char/tpm/tpm_tis_core.h2
4 files changed, 37 insertions, 26 deletions
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index fecdd3fa8126..a3461cbdde5f 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -522,8 +522,7 @@ static int tpm_startup(struct tpm_chip *chip, __be16 startup_type)
int tpm_get_timeouts(struct tpm_chip *chip)
{
cap_t cap;
- unsigned long new_timeout[4];
- unsigned long old_timeout[4];
+ unsigned long timeout_old[4], timeout_chip[4], timeout_eff[4];
ssize_t rc;
if (chip->flags & TPM_CHIP_FLAG_HAVE_TIMEOUTS)
@@ -564,11 +563,15 @@ int tpm_get_timeouts(struct tpm_chip *chip)
return rc;
}
- old_timeout[0] = be32_to_cpu(cap.timeout.a);
- old_timeout[1] = be32_to_cpu(cap.timeout.b);
- old_timeout[2] = be32_to_cpu(cap.timeout.c);
- old_timeout[3] = be32_to_cpu(cap.timeout.d);
- memcpy(new_timeout, old_timeout, sizeof(new_timeout));
+ 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
@@ -576,16 +579,24 @@ int tpm_get_timeouts(struct tpm_chip *chip)
*/
if (chip->ops->update_timeouts != NULL)
chip->timeout_adjusted =
- chip->ops->update_timeouts(chip, new_timeout);
+ chip->ops->update_timeouts(chip, timeout_eff);
if (!chip->timeout_adjusted) {
- /* Don't overwrite default if value is 0 */
- if (new_timeout[0] != 0 && new_timeout[0] < 1000) {
- int i;
+ /* Restore default if chip reported 0 */
+ 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(new_timeout); i++)
- new_timeout[i] *= 1000;
+ for (i = 0; i != ARRAY_SIZE(timeout_eff); i++)
+ timeout_eff[i] *= 1000;
chip->timeout_adjusted = true;
}
}
@@ -594,16 +605,16 @@ int tpm_get_timeouts(struct tpm_chip *chip)
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",
- old_timeout[0], new_timeout[0],
- old_timeout[1], new_timeout[1],
- old_timeout[2], new_timeout[2],
- old_timeout[3], new_timeout[3]);
+ 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(new_timeout[0]);
- chip->timeout_b = usecs_to_jiffies(new_timeout[1]);
- chip->timeout_c = usecs_to_jiffies(new_timeout[2]);
- chip->timeout_d = usecs_to_jiffies(new_timeout[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 = tpm_getcap(chip, TPM_CAP_PROP_TIS_DURATION, &cap,
"attempting to determine the durations");
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index 0127af130cb1..7912dadc39be 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -159,7 +159,7 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
irq = tpm_info->irq;
if (itpm)
- phy->priv.flags |= TPM_TIS_ITPM_POSSIBLE;
+ phy->priv.flags |= TPM_TIS_ITPM_WORKAROUND;
return tpm_tis_core_init(dev, &phy->priv, irq, &tpm_tcg,
acpi_dev_handle);
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 7993678954a2..0cfc0eed8525 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -264,7 +264,7 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
int rc, status, burstcnt;
size_t count = 0;
- bool itpm = priv->flags & TPM_TIS_ITPM_POSSIBLE;
+ bool itpm = priv->flags & TPM_TIS_ITPM_WORKAROUND;
if (request_locality(chip, 0) < 0)
return -EBUSY;
@@ -740,7 +740,7 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
(chip->flags & TPM_CHIP_FLAG_TPM2) ? "2.0" : "1.2",
vendor >> 16, rid);
- if (!(priv->flags & TPM_TIS_ITPM_POSSIBLE)) {
+ if (!(priv->flags & TPM_TIS_ITPM_WORKAROUND)) {
probe = probe_itpm(chip);
if (probe < 0) {
rc = -ENODEV;
@@ -748,7 +748,7 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
}
if (!!probe)
- priv->flags |= TPM_TIS_ITPM_POSSIBLE;
+ priv->flags |= TPM_TIS_ITPM_WORKAROUND;
}
/* Figure out the capabilities */
diff --git a/drivers/char/tpm/tpm_tis_core.h b/drivers/char/tpm/tpm_tis_core.h
index 9191aabbf9c2..e2212f021a02 100644
--- a/drivers/char/tpm/tpm_tis_core.h
+++ b/drivers/char/tpm/tpm_tis_core.h
@@ -80,7 +80,7 @@ enum tis_defaults {
#define TPM_RID(l) (0x0F04 | ((l) << 12))
enum tpm_tis_flags {
- TPM_TIS_ITPM_POSSIBLE = BIT(0),
+ TPM_TIS_ITPM_WORKAROUND = BIT(0),
};
struct tpm_tis_data {