[PATCH v6 07/20] tpm: move tpm_getcap to tpm1-cmd.c

From: Tomas Winkler
Date: Wed Oct 17 2018 - 02:50:37 EST

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1. Move tpm_getcap to tpm1-cmd. Rename the function to tpm1_getcap.
2. Remove unused tpm_getcap_header with unused constant
as this functionality is already implemented using tpm_buf construct.

Fixes warning:
drivers/char/tpm/tpm-interface.c:452:38: warning: âtpm_getcap_headerâ defined but not used [-Wunused-const-variable=]
static const struct tpm_input_header tpm_getcap_header = {
^~~~~~~~~~~~~~~~~
3. Drop unused TPM_DIGEST_SIZE. It's already defined in
include/linux/tpm.h

Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
---
V2-V3: Rebase
V4-V6: Resend

drivers/char/tpm/tpm-interface.c | 47 +-----------------------------------
drivers/char/tpm/tpm-sysfs.c | 48 ++++++++++++++++++-------------------
drivers/char/tpm/tpm.h | 4 ++--
drivers/char/tpm/tpm1-cmd.c | 51 +++++++++++++++++++++++++++++++++-------
drivers/char/tpm/tpm_tis_core.c | 2 +-
5 files changed, 71 insertions(+), 81 deletions(-)

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 177795b408ff..486e211b03a0 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -455,52 +455,6 @@ int tpm_startup(struct tpm_chip *chip)
return rc;
}

-#define TPM_DIGEST_SIZE 20
-#define TPM_RET_CODE_IDX 6
-#define TPM_INTERNAL_RESULT_SIZE 200
-#define TPM_ORD_GET_CAP 101
-#define TPM_ORD_GET_RANDOM 70
-
-static const struct tpm_input_header tpm_getcap_header = {
- .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
- .length = cpu_to_be32(22),
- .ordinal = cpu_to_be32(TPM_ORD_GET_CAP)
-};
-
-ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
- const char *desc, size_t min_cap_length)
-{
- struct tpm_buf buf;
- int rc;
-
- rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_CAP);
- if (rc)
- return rc;
-
- if (subcap_id == TPM_CAP_VERSION_1_1 ||
- subcap_id == TPM_CAP_VERSION_1_2) {
- tpm_buf_append_u32(&buf, subcap_id);
- tpm_buf_append_u32(&buf, 0);
- } else {
- if (subcap_id == TPM_CAP_FLAG_PERM ||
- subcap_id == TPM_CAP_FLAG_VOL)
- tpm_buf_append_u32(&buf, TPM_CAP_FLAG);
- else
- tpm_buf_append_u32(&buf, TPM_CAP_PROP);
-
- tpm_buf_append_u32(&buf, 4);
- tpm_buf_append_u32(&buf, subcap_id);
- }
- rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE,
- min_cap_length, 0, desc);
- if (!rc)
- *cap = *(cap_t *)&buf.data[TPM_HEADER_SIZE + 4];
-
- tpm_buf_destroy(&buf);
- return rc;
-}
-EXPORT_SYMBOL_GPL(tpm_getcap);
-
int tpm_get_timeouts(struct tpm_chip *chip)
{
if (chip->flags & TPM_CHIP_FLAG_HAVE_TIMEOUTS)
@@ -858,6 +812,7 @@ int tpm_pm_resume(struct device *dev)
}
EXPORT_SYMBOL_GPL(tpm_pm_resume);

+#define TPM_ORD_GET_RANDOM 70
#define TPM_GETRANDOM_RESULT_SIZE 18
static const struct tpm_input_header tpm_getrandom_header = {
.tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
index 83a77a445538..008515314ae3 100644
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -106,9 +106,9 @@ static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr,
char *str = buf;
struct tpm_chip *chip = to_tpm_chip(dev);

- rc = tpm_getcap(chip, TPM_CAP_PROP_PCR, &cap,
- "attempting to determine the number of PCRS",
- sizeof(cap.num_pcrs));
+ rc = tpm1_getcap(chip, TPM_CAP_PROP_PCR, &cap,
+ "attempting to determine the number of PCRS",
+ sizeof(cap.num_pcrs));
if (rc)
return 0;

@@ -132,9 +132,9 @@ static ssize_t enabled_show(struct device *dev, struct device_attribute *attr,
cap_t cap;
ssize_t rc;

- rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap,
- "attempting to determine the permanent enabled state",
- sizeof(cap.perm_flags));
+ rc = tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap,
+ "attempting to determine the permanent enabled state",
+ sizeof(cap.perm_flags));
if (rc)
return 0;

@@ -149,9 +149,9 @@ static ssize_t active_show(struct device *dev, struct device_attribute *attr,
cap_t cap;
ssize_t rc;

- rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap,
- "attempting to determine the permanent active state",
- sizeof(cap.perm_flags));
+ rc = tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap,
+ "attempting to determine the permanent active state",
+ sizeof(cap.perm_flags));
if (rc)
return 0;

@@ -166,9 +166,9 @@ static ssize_t owned_show(struct device *dev, struct device_attribute *attr,
cap_t cap;
ssize_t rc;

- rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap,
- "attempting to determine the owner state",
- sizeof(cap.owned));
+ rc = tpm1_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap,
+ "attempting to determine the owner state",
+ sizeof(cap.owned));
if (rc)
return 0;

@@ -183,9 +183,9 @@ static ssize_t temp_deactivated_show(struct device *dev,
cap_t cap;
ssize_t rc;

- rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap,
- "attempting to determine the temporary state",
- sizeof(cap.stclear_flags));
+ rc = tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap,
+ "attempting to determine the temporary state",
+ sizeof(cap.stclear_flags));
if (rc)
return 0;

@@ -202,18 +202,18 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
ssize_t rc;
char *str = buf;

- rc = tpm_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap,
- "attempting to determine the manufacturer",
- sizeof(cap.manufacturer_id));
+ rc = tpm1_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap,
+ "attempting to determine the manufacturer",
+ sizeof(cap.manufacturer_id));
if (rc)
return 0;
str += sprintf(str, "Manufacturer: 0x%x\n",
be32_to_cpu(cap.manufacturer_id));

/* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */
- rc = tpm_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
- "attempting to determine the 1.2 version",
- sizeof(cap.tpm_version_1_2));
+ rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
+ "attempting to determine the 1.2 version",
+ sizeof(cap.tpm_version_1_2));
if (!rc) {
str += sprintf(str,
"TCG version: %d.%d\nFirmware version: %d.%d\n",
@@ -223,9 +223,9 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
cap.tpm_version_1_2.revMinor);
} else {
/* Otherwise just use TPM_STRUCT_VER */
- rc = tpm_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
- "attempting to determine the 1.1 version",
- sizeof(cap.tpm_version));
+ rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
+ "attempting to determine the 1.1 version",
+ sizeof(cap.tpm_version));
if (rc)
return 0;
str += sprintf(str,
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 221b6dcd15a1..05c386b3ab12 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -541,8 +541,6 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space,
size_t min_rsp_body_length, unsigned int flags,
const char *desc);
int tpm_startup(struct tpm_chip *chip);
-ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
- const char *desc, size_t min_cap_length);
int tpm_get_timeouts(struct tpm_chip *);
int tpm1_auto_startup(struct tpm_chip *chip);
int tpm_do_selftest(struct tpm_chip *chip);
@@ -551,6 +549,8 @@ int tpm1_get_timeouts(struct tpm_chip *chip);
unsigned long tpm1_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
int tpm1_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash,
const char *log_msg);
+ssize_t tpm1_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
+ const char *desc, size_t min_cap_length);
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 ec242397e6dc..3bd079587ef5 100644
--- a/drivers/char/tpm/tpm1-cmd.c
+++ b/drivers/char/tpm/tpm1-cmd.c
@@ -314,15 +314,15 @@ int tpm1_get_timeouts(struct tpm_chip *chip)
unsigned long timeout_old[4], timeout_chip[4], timeout_eff[4];
ssize_t rc;

- rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, NULL,
- sizeof(cap.timeout));
+ rc = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, NULL,
+ sizeof(cap.timeout));
if (rc == TPM_ERR_INVALID_POSTINIT) {
if (tpm_startup(chip))
return rc;

- rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap,
- "attempting to determine the timeouts",
- sizeof(cap.timeout));
+ rc = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap,
+ "attempting to determine the timeouts",
+ sizeof(cap.timeout));
}

if (rc) {
@@ -383,9 +383,9 @@ int tpm1_get_timeouts(struct tpm_chip *chip)
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",
- sizeof(cap.duration));
+ rc = tpm1_getcap(chip, TPM_CAP_PROP_TIS_DURATION, &cap,
+ "attempting to determine the durations",
+ sizeof(cap.duration));
if (rc)
return rc;

@@ -434,3 +434,38 @@ int tpm1_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash,
tpm_buf_destroy(&buf);
return rc;
}
+
+#define TPM_ORD_GET_CAP 101
+ssize_t tpm1_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
+ const char *desc, size_t min_cap_length)
+{
+ struct tpm_buf buf;
+ int rc;
+
+ rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_CAP);
+ if (rc)
+ return rc;
+
+ if (subcap_id == TPM_CAP_VERSION_1_1 ||
+ subcap_id == TPM_CAP_VERSION_1_2) {
+ tpm_buf_append_u32(&buf, subcap_id);
+ tpm_buf_append_u32(&buf, 0);
+ } else {
+ if (subcap_id == TPM_CAP_FLAG_PERM ||
+ subcap_id == TPM_CAP_FLAG_VOL)
+ tpm_buf_append_u32(&buf, TPM_CAP_FLAG);
+ else
+ tpm_buf_append_u32(&buf, TPM_CAP_PROP);
+
+ tpm_buf_append_u32(&buf, 4);
+ tpm_buf_append_u32(&buf, subcap_id);
+ }
+ rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE,
+ min_cap_length, 0, desc);
+ if (!rc)
+ *cap = *(cap_t *)&buf.data[TPM_HEADER_SIZE + 4];
+
+ tpm_buf_destroy(&buf);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(tpm1_getcap);
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index f9e73d0f9386..ced01ec146b5 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -664,7 +664,7 @@ static int tpm_tis_gen_interrupt(struct tpm_chip *chip)
if (chip->flags & TPM_CHIP_FLAG_TPM2)
return tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
else
- return tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc,
+ return tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc,
0);
}

--
2.14.4

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