diff options
| author | Stefan Berger <stefanb@linux.vnet.ibm.com> | 2011-03-30 18:13:25 +0200 |
|---|---|---|
| committer | Rajiv Andrade <srajiv@linux.vnet.ibm.com> | 2011-07-12 23:53:07 +0200 |
| commit | 04ab2293bbd36fc04060da93058cef7789414585 (patch) | |
| tree | 051266e417a83140a7d2c80486f98e3c219d7eba /drivers/char | |
| parent | tpm: Adjust the durations if they are too small (diff) | |
| download | linux-04ab2293bbd36fc04060da93058cef7789414585.tar.xz linux-04ab2293bbd36fc04060da93058cef7789414585.zip | |
tpm_tis: Introduce durations sysfs entry
Display the TPM's command timeouts in a 'durations' sysfs entry. Display
the entries as having been adjusted when they were scaled due to their values
being reported in milliseconds rather than microseconds.
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Tested-by: Guillaume Chazarain <guichaz@gmail.com>
Signed-off-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/tpm/tpm.c | 15 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm.h | 3 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm_tis.c | 4 |
3 files changed, 21 insertions, 1 deletions
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c index 277cf22609ca..27abfd93714d 100644 --- a/drivers/char/tpm/tpm.c +++ b/drivers/char/tpm/tpm.c @@ -597,6 +597,7 @@ duration: chip->vendor.duration[TPM_SHORT] = HZ; chip->vendor.duration[TPM_MEDIUM] *= 1000; chip->vendor.duration[TPM_LONG] *= 1000; + chip->vendor.duration_adjusted = true; dev_info(chip->dev, "Adjusting TPM timeout parameters."); } } @@ -944,6 +945,20 @@ ssize_t tpm_show_caps_1_2(struct device * dev, } EXPORT_SYMBOL_GPL(tpm_show_caps_1_2); +ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct tpm_chip *chip = dev_get_drvdata(dev); + + return sprintf(buf, "%d %d %d [%s]\n", + jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]), + jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]), + jiffies_to_usecs(chip->vendor.duration[TPM_LONG]), + chip->vendor.duration_adjusted + ? "adjusted" : "original"); +} +EXPORT_SYMBOL_GPL(tpm_show_durations); + ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index 72ddb031b69a..6fc797611ccb 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -56,6 +56,8 @@ extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr, char *); extern ssize_t tpm_show_temp_deactivated(struct device *, struct device_attribute *attr, char *); +extern ssize_t tpm_show_durations(struct device *, + struct device_attribute *attr, char *); struct tpm_chip; @@ -82,6 +84,7 @@ struct tpm_vendor_specific { int locality; unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */ unsigned long duration[3]; /* jiffies */ + bool duration_adjusted; wait_queue_head_t read_queue; wait_queue_head_t int_queue; diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c index dd21df55689d..e15b30d49543 100644 --- a/drivers/char/tpm/tpm_tis.c +++ b/drivers/char/tpm/tpm_tis.c @@ -376,6 +376,7 @@ static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated, NULL); static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL); static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel); +static DEVICE_ATTR(durations, S_IRUGO, tpm_show_durations, NULL); static struct attribute *tis_attrs[] = { &dev_attr_pubek.attr, @@ -385,7 +386,8 @@ static struct attribute *tis_attrs[] = { &dev_attr_owned.attr, &dev_attr_temp_deactivated.attr, &dev_attr_caps.attr, - &dev_attr_cancel.attr, NULL, + &dev_attr_cancel.attr, + &dev_attr_durations.attr, NULL, }; static struct attribute_group tis_attr_grp = { |