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tpm: replace msleep() with usleep_range() in TPM 1.2/2.0 generic drivers 

The patch simply replaces all msleep function calls with usleep_range calls
in the generic drivers.

Tested with an Infineon TPM 1.2, using the generic tpm-tis module, for a
thousand PCR extends, we see results going from 1m57s unpatched to 40s
with the new patch. We obtain similar results when using the original and
patched tpm_infineon driver, which is also part of the patch.
Similarly with a STM TPM 2.0, using the CRB driver, it takes about 20ms per
extend unpatched and around 7ms with the new patch.

Note that the PCR consistency is untouched with this patch, each TPM has
been tested with 10 million extends and the aggregated PCR value is
continuously verified to be correct.

As an extension of this work, this could potentially and easily be applied
to other vendor's drivers. Still, these changes are not included in the
proposed patch as they are untested.

Signed-off-by: Hamza Attak <hamza@hpe.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
zero-colors
Hamza Attak 2017-08-14 19:09:16 +01:00 committed by James Morris
parent 5d0e4d7814
commit 9f3fc7bcdd
5 changed files with 21 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/char/tpm/tpm-interface.c
View File

@ -455,7 +455,7 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
goto out;
}
msleep(TPM_TIMEOUT); /* CHECK */
tpm_msleep(TPM_TIMEOUT);
rmb();
} while (time_before(jiffies, stop));
@ -970,7 +970,7 @@ int tpm_do_selftest(struct tpm_chip *chip)
dev_info(
&chip->dev, HW_ERR
"TPM command timed out during continue self test");
msleep(delay_msec);
tpm_msleep(delay_msec);
continue;
}
@ -985,7 +985,7 @@ int tpm_do_selftest(struct tpm_chip *chip)
}
if (rc != TPM_WARN_DOING_SELFTEST)
return rc;
msleep(delay_msec);
tpm_msleep(delay_msec);
} while (--loops > 0);
return rc;
@ -1085,7 +1085,7 @@ again:
}
} else {
do {
msleep(TPM_TIMEOUT);
tpm_msleep(TPM_TIMEOUT);
status = chip->ops->status(chip);
if ((status & mask) == mask)
return 0;
@ -1150,7 +1150,7 @@ int tpm_pm_suspend(struct device *dev)
*/
if (rc != TPM_WARN_RETRY)
break;
msleep(TPM_TIMEOUT_RETRY);
tpm_msleep(TPM_TIMEOUT_RETRY);
}
if (rc)

9
drivers/char/tpm/tpm.h
View File

@ -50,7 +50,8 @@ enum tpm_const {
enum tpm_timeout {
TPM_TIMEOUT = 5, /* msecs */
TPM_TIMEOUT_RETRY = 100 /* msecs */
TPM_TIMEOUT_RETRY = 100, /* msecs */
TPM_TIMEOUT_RANGE_US = 300 /* usecs */
};
/* TPM addresses */
@ -527,6 +528,12 @@ int tpm_pm_resume(struct device *dev);
int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
wait_queue_head_t *queue, bool check_cancel);
static inline void tpm_msleep(unsigned int delay_msec)
{
usleep_range(delay_msec * 1000,
(delay_msec * 1000) + TPM_TIMEOUT_RANGE_US);
};
struct tpm_chip *tpm_chip_find_get(int chip_num);
__must_check int tpm_try_get_ops(struct tpm_chip *chip);
void tpm_put_ops(struct tpm_chip *chip);

2
drivers/char/tpm/tpm2-cmd.c
View File

@ -899,7 +899,7 @@ static int tpm2_do_selftest(struct tpm_chip *chip)
if (rc != TPM2_RC_TESTING)
break;
msleep(delay_msec);
tpm_msleep(delay_msec);
}
return rc;

6
drivers/char/tpm/tpm_infineon.c
View File

@ -191,7 +191,7 @@ static int wait(struct tpm_chip *chip, int wait_for_bit)
/* check the status-register if wait_for_bit is set */
if (status & 1 << wait_for_bit)
break;
msleep(TPM_MSLEEP_TIME);
tpm_msleep(TPM_MSLEEP_TIME);
}
if (i == TPM_MAX_TRIES) { /* timeout occurs */
if (wait_for_bit == STAT_XFE)
@ -226,7 +226,7 @@ static void tpm_wtx(struct tpm_chip *chip)
wait_and_send(chip, TPM_CTRL_WTX);
wait_and_send(chip, 0x00);
wait_and_send(chip, 0x00);
msleep(TPM_WTX_MSLEEP_TIME);
tpm_msleep(TPM_WTX_MSLEEP_TIME);
}
static void tpm_wtx_abort(struct tpm_chip *chip)
@ -237,7 +237,7 @@ static void tpm_wtx_abort(struct tpm_chip *chip)
wait_and_send(chip, 0x00);
wait_and_send(chip, 0x00);
number_of_wtx = 0;
msleep(TPM_WTX_MSLEEP_TIME);
tpm_msleep(TPM_WTX_MSLEEP_TIME);
}
static int tpm_inf_recv(struct tpm_chip *chip, u8 * buf, size_t count)

8
drivers/char/tpm/tpm_tis_core.c
View File

@ -51,7 +51,7 @@ static int wait_startup(struct tpm_chip *chip, int l)
if (access & TPM_ACCESS_VALID)
return 0;
msleep(TPM_TIMEOUT);
tpm_msleep(TPM_TIMEOUT);
} while (time_before(jiffies, stop));
return -1;
}
@ -117,7 +117,7 @@ again:
do {
if (check_locality(chip, l))
return l;
msleep(TPM_TIMEOUT);
tpm_msleep(TPM_TIMEOUT);
} while (time_before(jiffies, stop));
}
return -1;
@ -164,7 +164,7 @@ static int get_burstcount(struct tpm_chip *chip)
burstcnt = (value >> 8) & 0xFFFF;
if (burstcnt)
return burstcnt;
msleep(TPM_TIMEOUT);
tpm_msleep(TPM_TIMEOUT);
} while (time_before(jiffies, stop));
return -EBUSY;
}
@ -396,7 +396,7 @@ static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
priv->irq = irq;
chip->flags |= TPM_CHIP_FLAG_IRQ;
if (!priv->irq_tested)
msleep(1);
tpm_msleep(1);
if (!priv->irq_tested)
disable_interrupts(chip);
priv->irq_tested = true;