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Subject[PATCH v7 05/21] tpm: add tpm_calc_ordinal_duration() wrapper
Date
Add convenient wrapper for ordinal duration computation
to remove boiler plate if else statement over TPM2.

if (chip->flags & TPM_CHIP_FLAG_TPM2)
tpm2_calc_ordinal_duration(chip, ordinal);
else
tpm1_calc_ordinal_duration(chip, ordinal);

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---

V2-V3: Rebase.
V4: Add Kdoc.
V5: Adjust the kdoc to the new standard.
V6: Resend.
V7: Rebase over nuvoton patch.

drivers/char/tpm/st33zp24/st33zp24.c | 2 +-
drivers/char/tpm/tpm-interface.c | 24 ++++++++++++++++++++----
drivers/char/tpm/tpm.h | 1 +
drivers/char/tpm/tpm1-cmd.c | 1 -
drivers/char/tpm/tpm2-cmd.c | 1 -
drivers/char/tpm/tpm_i2c_nuvoton.c | 5 +----
drivers/char/tpm/tpm_tis_core.c | 6 +-----
drivers/char/tpm/xen-tpmfront.c | 2 +-
8 files changed, 25 insertions(+), 17 deletions(-)

diff --git a/drivers/char/tpm/st33zp24/st33zp24.c b/drivers/char/tpm/st33zp24/st33zp24.c
index 16be974955ea..abd675bec88c 100644
--- a/drivers/char/tpm/st33zp24/st33zp24.c
+++ b/drivers/char/tpm/st33zp24/st33zp24.c
@@ -430,7 +430,7 @@ static int st33zp24_send(struct tpm_chip *chip, unsigned char *buf,
ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));

ret = wait_for_stat(chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
- tpm1_calc_ordinal_duration(chip, ordinal),
+ tpm_calc_ordinal_duration(chip, ordinal),
&tpm_dev->read_queue, false);
if (ret < 0)
goto out_err;
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 21c6ed2a6bc1..ca09f84bfb27 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -47,6 +47,25 @@ module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644);
MODULE_PARM_DESC(suspend_pcr,
"PCR to use for dummy writes to facilitate flush on suspend.");

+/**
+ * tpm_calc_ordinal_duration() - calculate the maximum command duration
+ * @chip: TPM chip to use.
+ * @ordinal: TPM command ordinal.
+ *
+ * The function returns the maximum amount of time the chip could take
+ * to return the result for a particular ordinal in jiffies.
+ *
+ * Return: A maximal duration time for an ordinal in jiffies.
+ */
+unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
+{
+ if (chip->flags & TPM_CHIP_FLAG_TPM2)
+ return tpm2_calc_ordinal_duration(chip, ordinal);
+ else
+ return tpm1_calc_ordinal_duration(chip, ordinal);
+}
+EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
+
static int tpm_validate_command(struct tpm_chip *chip,
struct tpm_space *space,
const u8 *cmd,
@@ -222,10 +241,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
if (chip->flags & TPM_CHIP_FLAG_IRQ)
goto out_recv;

- if (chip->flags & TPM_CHIP_FLAG_TPM2)
- stop = jiffies + tpm2_calc_ordinal_duration(chip, ordinal);
- else
- stop = jiffies + tpm1_calc_ordinal_duration(chip, ordinal);
+ stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
do {
u8 status = chip->ops->status(chip);
if ((status & chip->ops->req_complete_mask) ==
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index c59d2c20c339..73511cd89bef 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -547,6 +547,7 @@ int tpm_get_timeouts(struct tpm_chip *);
int tpm1_auto_startup(struct tpm_chip *chip);
int tpm_do_selftest(struct tpm_chip *chip);
unsigned long tpm1_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
+unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
int tpm_pm_suspend(struct device *dev);
int tpm_pm_resume(struct device *dev);

diff --git a/drivers/char/tpm/tpm1-cmd.c b/drivers/char/tpm/tpm1-cmd.c
index 991260134659..dfbe9c60cbcf 100644
--- a/drivers/char/tpm/tpm1-cmd.c
+++ b/drivers/char/tpm/tpm1-cmd.c
@@ -307,4 +307,3 @@ unsigned long tpm1_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
else
return duration;
}
-EXPORT_SYMBOL_GPL(tpm1_calc_ordinal_duration);
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index d26b439976bc..3eef5565286d 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -132,7 +132,6 @@ unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
else
return msecs_to_jiffies(TPM2_DURATION_DEFAULT);
}
-EXPORT_SYMBOL_GPL(tpm2_calc_ordinal_duration);


struct tpm2_pcr_read_out {
diff --git a/drivers/char/tpm/tpm_i2c_nuvoton.c b/drivers/char/tpm/tpm_i2c_nuvoton.c
index ad76482ee387..217f7f1cbde8 100644
--- a/drivers/char/tpm/tpm_i2c_nuvoton.c
+++ b/drivers/char/tpm/tpm_i2c_nuvoton.c
@@ -456,10 +456,7 @@ static int i2c_nuvoton_send(struct tpm_chip *chip, u8 *buf, size_t len)
return rc;
}
ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
- if (chip->flags & TPM_CHIP_FLAG_TPM2)
- duration = tpm2_calc_ordinal_duration(chip, ordinal);
- else
- duration = tpm1_calc_ordinal_duration(chip, ordinal);
+ duration = tpm_calc_ordinal_duration(chip, ordinal);

rc = i2c_nuvoton_wait_for_data_avail(chip, duration, &priv->read_queue);
if (rc) {
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 14c332104de4..f9e73d0f9386 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -473,11 +473,7 @@ static int tpm_tis_send_main(struct tpm_chip *chip, const u8 *buf, size_t len)
if (chip->flags & TPM_CHIP_FLAG_IRQ) {
ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));

- if (chip->flags & TPM_CHIP_FLAG_TPM2)
- dur = tpm2_calc_ordinal_duration(chip, ordinal);
- else
- dur = tpm1_calc_ordinal_duration(chip, ordinal);
-
+ dur = tpm_calc_ordinal_duration(chip, ordinal);
if (wait_for_tpm_stat
(chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID, dur,
&priv->read_queue, false) < 0) {
diff --git a/drivers/char/tpm/xen-tpmfront.c b/drivers/char/tpm/xen-tpmfront.c
index 77097229bf49..b150f87f38f5 100644
--- a/drivers/char/tpm/xen-tpmfront.c
+++ b/drivers/char/tpm/xen-tpmfront.c
@@ -164,7 +164,7 @@ static int vtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
notify_remote_via_evtchn(priv->evtchn);

ordinal = be32_to_cpu(((struct tpm_input_header*)buf)->ordinal);
- duration = tpm1_calc_ordinal_duration(chip, ordinal);
+ duration = tpm_calc_ordinal_duration(chip, ordinal);

if (wait_for_tpm_stat(chip, VTPM_STATUS_IDLE, duration,
&priv->read_queue, true) < 0) {
--
2.14.4
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