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Subject[PATCH 1/2] TPM: sysfs functions consolidation
Date
According to Dave Hansen's comments on the tpm_show_*, some of these functions
present a pattern when allocating data[] memory space and also when setting its
content. A new function was created so that this pattern could be consolidated.
Also, replaced the data[] command vectors and its indexes by meaningful structures
as pointed out by Matt Helsley too.

Signed-off-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
---
drivers/char/tpm/tpm.c | 411 +++++++++++++++++-------------------------------
drivers/char/tpm/tpm.h | 124 +++++++++++++++
2 files changed, 266 insertions(+), 269 deletions(-)
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index 9c47dc4..9b9eb76 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -429,134 +429,148 @@ out:
#define TPM_DIGEST_SIZE 20
#define TPM_ERROR_SIZE 10
#define TPM_RET_CODE_IDX 6
-#define TPM_GET_CAP_RET_SIZE_IDX 10
-#define TPM_GET_CAP_RET_UINT32_1_IDX 14
-#define TPM_GET_CAP_RET_UINT32_2_IDX 18
-#define TPM_GET_CAP_RET_UINT32_3_IDX 22
-#define TPM_GET_CAP_RET_UINT32_4_IDX 26
-#define TPM_GET_CAP_PERM_DISABLE_IDX 16
-#define TPM_GET_CAP_PERM_INACTIVE_IDX 18
-#define TPM_GET_CAP_RET_BOOL_1_IDX 14
-#define TPM_GET_CAP_TEMP_INACTIVE_IDX 16
-
-#define TPM_CAP_IDX 13
-#define TPM_CAP_SUBCAP_IDX 21

enum tpm_capabilities {
- TPM_CAP_FLAG = 4,
- TPM_CAP_PROP = 5,
+ TPM_CAP_FLAG = cpu_to_be32(4),
+ TPM_CAP_PROP = cpu_to_be32(5),
+ CAP_VERSION_1_1 = cpu_to_be32(0x06),
+ CAP_VERSION_1_2 = cpu_to_be32(0x1A)
};

enum tpm_sub_capabilities {
- TPM_CAP_PROP_PCR = 0x1,
- TPM_CAP_PROP_MANUFACTURER = 0x3,
- TPM_CAP_FLAG_PERM = 0x8,
- TPM_CAP_FLAG_VOL = 0x9,
- TPM_CAP_PROP_OWNER = 0x11,
- TPM_CAP_PROP_TIS_TIMEOUT = 0x15,
- TPM_CAP_PROP_TIS_DURATION = 0x20,
-};
+ TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
+ TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
+ TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
+ TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
+ TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
+ TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
+ TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),

-/*
- * This is a semi generic GetCapability command for use
- * with the capability type TPM_CAP_PROP or TPM_CAP_FLAG
- * and their associated sub_capabilities.
- */
-
-static const u8 tpm_cap[] = {
- 0, 193, /* TPM_TAG_RQU_COMMAND */
- 0, 0, 0, 22, /* length */
- 0, 0, 0, 101, /* TPM_ORD_GetCapability */
- 0, 0, 0, 0, /* TPM_CAP_<TYPE> */
- 0, 0, 0, 4, /* TPM_CAP_SUB_<TYPE> size */
- 0, 0, 1, 0 /* TPM_CAP_SUB_<TYPE> */
};

-static ssize_t transmit_cmd(struct tpm_chip *chip, u8 *data, int len,
- char *desc)
+static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
+ int len, const char *desc)
{
int err;

- len = tpm_transmit(chip, data, len);
+ len = tpm_transmit(chip,(u8 *) cmd, len);
if (len < 0)
return len;
if (len == TPM_ERROR_SIZE) {
- err = be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX)));
+ err = be32_to_cpu(cmd->header.out.return_code);
dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
return err;
}
return 0;
}

+#define TPM_INTERNAL_RESULT_SIZE 200
+#define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
+#define TPM_ORD_GET_CAP cpu_to_be32(101)
+
+static const struct tpm_input_header tpm_getcap_header = {
+ .tag = TPM_TAG_RQU_COMMAND,
+ .length = cpu_to_be32(22),
+ .ordinal = TPM_ORD_GET_CAP
+};
+
+ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,
+ const char *desc)
+{
+ struct tpm_cmd_t tpm_cmd;
+ int rc;
+ struct tpm_chip *chip = dev_get_drvdata(dev);
+
+ tpm_cmd.header.in = tpm_getcap_header;
+ if (subcap_id == CAP_VERSION_1_1 || subcap_id == CAP_VERSION_1_2) {
+ tpm_cmd.params.getcap_in.cap = subcap_id;
+ /*subcap field not necessary */
+ tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
+ tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
+ } else {
+ if (subcap_id == TPM_CAP_FLAG_PERM ||
+ subcap_id == TPM_CAP_FLAG_VOL)
+ tpm_cmd.params.getcap_in.cap = TPM_CAP_FLAG;
+ else
+ tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
+ tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
+ tpm_cmd.params.getcap_in.subcap = subcap_id;
+ }
+ rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
+ if (!rc)
+ *cap = tpm_cmd.params.getcap_out.cap;
+ return rc;
+}
+
void tpm_gen_interrupt(struct tpm_chip *chip)
{
- u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
+ struct tpm_cmd_t tpm_cmd;
ssize_t rc;

- memcpy(data, tpm_cap, sizeof(tpm_cap));
- data[TPM_CAP_IDX] = TPM_CAP_PROP;
- data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
+ tpm_cmd.header.in = tpm_getcap_header;
+ tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
+ tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
+ tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;

- rc = transmit_cmd(chip, data, sizeof(data),
+ rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
"attempting to determine the timeouts");
}
EXPORT_SYMBOL_GPL(tpm_gen_interrupt);

void tpm_get_timeouts(struct tpm_chip *chip)
{
- u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
+ struct tpm_cmd_t tpm_cmd;
+ struct timeout_t *timeout_cap;
+ struct duration_t *duration_cap;
ssize_t rc;
u32 timeout;

- memcpy(data, tpm_cap, sizeof(tpm_cap));
- data[TPM_CAP_IDX] = TPM_CAP_PROP;
- data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
+ tpm_cmd.header.in = tpm_getcap_header;
+ tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
+ tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
+ tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;

- rc = transmit_cmd(chip, data, sizeof(data),
+ rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
"attempting to determine the timeouts");
if (rc)
goto duration;

- if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
+ if (be32_to_cpu(tpm_cmd.header.out.length)
!= 4 * sizeof(u32))
goto duration;

+ timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
/* Don't overwrite default if value is 0 */
- timeout =
- be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)));
+ timeout = be32_to_cpu(timeout_cap->a);
if (timeout)
chip->vendor.timeout_a = usecs_to_jiffies(timeout);
- timeout =
- be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_2_IDX)));
+ timeout = be32_to_cpu(timeout_cap->b);
if (timeout)
chip->vendor.timeout_b = usecs_to_jiffies(timeout);
- timeout =
- be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_3_IDX)));
+ timeout = be32_to_cpu(timeout_cap->c);
if (timeout)
chip->vendor.timeout_c = usecs_to_jiffies(timeout);
- timeout =
- be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_4_IDX)));
+ timeout = be32_to_cpu(timeout_cap->d);
if (timeout)
chip->vendor.timeout_d = usecs_to_jiffies(timeout);

duration:
- memcpy(data, tpm_cap, sizeof(tpm_cap));
- data[TPM_CAP_IDX] = TPM_CAP_PROP;
- data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_DURATION;
+ tpm_cmd.header.in = tpm_getcap_header;
+ tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
+ tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
+ tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;

- rc = transmit_cmd(chip, data, sizeof(data),
+ rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
"attempting to determine the durations");
if (rc)
return;

- if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
+ if (be32_to_cpu(tpm_cmd.header.out.return_code)
!= 3 * sizeof(u32))
return;
-
+ duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
chip->vendor.duration[TPM_SHORT] =
- usecs_to_jiffies(be32_to_cpu
- (*((__be32 *) (data +
- TPM_GET_CAP_RET_UINT32_1_IDX))));
+ usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
/* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
* value wrong and apparently reports msecs rather than usecs. So we
* fix up the resulting too-small TPM_SHORT value to make things work.
@@ -565,13 +579,9 @@ duration:
chip->vendor.duration[TPM_SHORT] = HZ;

chip->vendor.duration[TPM_MEDIUM] =
- usecs_to_jiffies(be32_to_cpu
- (*((__be32 *) (data +
- TPM_GET_CAP_RET_UINT32_2_IDX))));
+ usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
chip->vendor.duration[TPM_LONG] =
- usecs_to_jiffies(be32_to_cpu
- (*((__be32 *) (data +
- TPM_GET_CAP_RET_UINT32_3_IDX))));
+ usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
}
EXPORT_SYMBOL_GPL(tpm_get_timeouts);

@@ -587,36 +597,18 @@ void tpm_continue_selftest(struct tpm_chip *chip)
}
EXPORT_SYMBOL_GPL(tpm_continue_selftest);

-#define TPM_INTERNAL_RESULT_SIZE 200
-
ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
char *buf)
{
- u8 *data;
+ cap_t cap;
ssize_t rc;

- struct tpm_chip *chip = dev_get_drvdata(dev);
- if (chip == NULL)
- return -ENODEV;
-
- data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- memcpy(data, tpm_cap, sizeof(tpm_cap));
- data[TPM_CAP_IDX] = TPM_CAP_FLAG;
- data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
-
- rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
- "attemtping to determine the permanent enabled state");
- if (rc) {
- kfree(data);
+ rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
+ "attempting to determine the permanent enabled state");
+ if (rc)
return 0;
- }
-
- rc = sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_DISABLE_IDX]);

- kfree(data);
+ rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
return rc;
}
EXPORT_SYMBOL_GPL(tpm_show_enabled);
@@ -624,31 +616,15 @@ EXPORT_SYMBOL_GPL(tpm_show_enabled);
ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
char *buf)
{
- u8 *data;
+ cap_t cap;
ssize_t rc;

- struct tpm_chip *chip = dev_get_drvdata(dev);
- if (chip == NULL)
- return -ENODEV;
-
- data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- memcpy(data, tpm_cap, sizeof(tpm_cap));
- data[TPM_CAP_IDX] = TPM_CAP_FLAG;
- data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
-
- rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
- "attemtping to determine the permanent active state");
- if (rc) {
- kfree(data);
+ rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
+ "attempting to determine the permanent active state");
+ if (rc)
return 0;
- }

- rc = sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_INACTIVE_IDX]);
-
- kfree(data);
+ rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
return rc;
}
EXPORT_SYMBOL_GPL(tpm_show_active);
@@ -656,31 +632,15 @@ EXPORT_SYMBOL_GPL(tpm_show_active);
ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
char *buf)
{
- u8 *data;
+ cap_t cap;
ssize_t rc;

- struct tpm_chip *chip = dev_get_drvdata(dev);
- if (chip == NULL)
- return -ENODEV;
-
- data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- memcpy(data, tpm_cap, sizeof(tpm_cap));
- data[TPM_CAP_IDX] = TPM_CAP_PROP;
- data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_OWNER;
-
- rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
- "attempting to determine the owner state");
- if (rc) {
- kfree(data);
+ rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
+ "attempting to determine the owner state");
+ if (rc)
return 0;
- }
-
- rc = sprintf(buf, "%d\n", data[TPM_GET_CAP_RET_BOOL_1_IDX]);

- kfree(data);
+ rc = sprintf(buf, "%d\n", cap.owned);
return rc;
}
EXPORT_SYMBOL_GPL(tpm_show_owned);
@@ -688,31 +648,15 @@ EXPORT_SYMBOL_GPL(tpm_show_owned);
ssize_t tpm_show_temp_deactivated(struct device * dev,
struct device_attribute * attr, char *buf)
{
- u8 *data;
+ cap_t cap;
ssize_t rc;

- struct tpm_chip *chip = dev_get_drvdata(dev);
- if (chip == NULL)
- return -ENODEV;
-
- data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- memcpy(data, tpm_cap, sizeof(tpm_cap));
- data[TPM_CAP_IDX] = TPM_CAP_FLAG;
- data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_VOL;
-
- rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
- "attempting to determine the temporary state");
- if (rc) {
- kfree(data);
+ rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
+ "attempting to determine the temporary state");
+ if (rc)
return 0;
- }

- rc = sprintf(buf, "%d\n", data[TPM_GET_CAP_TEMP_INACTIVE_IDX]);
-
- kfree(data);
+ rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
return rc;
}
EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
@@ -727,77 +671,64 @@ static const u8 pcrread[] = {
ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
char *buf)
{
+ cap_t cap;
u8 *data;
ssize_t rc;
int i, j, num_pcrs;
__be32 index;
char *str = buf;
-
struct tpm_chip *chip = dev_get_drvdata(dev);
- if (chip == NULL)
- return -ENODEV;

data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
if (!data)
return -ENOMEM;

- memcpy(data, tpm_cap, sizeof(tpm_cap));
- data[TPM_CAP_IDX] = TPM_CAP_PROP;
- data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_PCR;
-
- rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
+ rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
"attempting to determine the number of PCRS");
- if (rc) {
- kfree(data);
+ if (rc)
return 0;
- }

- num_pcrs = be32_to_cpu(*((__be32 *) (data + 14)));
+ num_pcrs = be32_to_cpu(cap.num_pcrs);
for (i = 0; i < num_pcrs; i++) {
memcpy(data, pcrread, sizeof(pcrread));
index = cpu_to_be32(i);
memcpy(data + 10, &index, 4);
- rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
- "attempting to read a PCR");
+ rc = transmit_cmd(chip, (struct tpm_cmd_t *)data,
+ TPM_INTERNAL_RESULT_SIZE,
+ "attempting to read a PCR");
if (rc)
- goto out;
+ break;
str += sprintf(str, "PCR-%02d: ", i);
for (j = 0; j < TPM_DIGEST_SIZE; j++)
str += sprintf(str, "%02X ", *(data + 10 + j));
str += sprintf(str, "\n");
}
-out:
kfree(data);
return str - buf;
}
EXPORT_SYMBOL_GPL(tpm_show_pcrs);

#define READ_PUBEK_RESULT_SIZE 314
-static const u8 readpubek[] = {
- 0, 193, /* TPM_TAG_RQU_COMMAND */
- 0, 0, 0, 30, /* length */
- 0, 0, 0, 124, /* TPM_ORD_ReadPubek */
+#define TPM_ORD_READPUBEK cpu_to_be32(124)
+struct tpm_input_header tpm_readpubek_header = {
+ .tag = TPM_TAG_RQU_COMMAND,
+ .length = cpu_to_be32(30),
+ .ordinal = TPM_ORD_READPUBEK
};

ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
char *buf)
{
u8 *data;
+ struct tpm_cmd_t tpm_cmd;
ssize_t err;
int i, rc;
char *str = buf;

struct tpm_chip *chip = dev_get_drvdata(dev);
- if (chip == NULL)
- return -ENODEV;

- data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- memcpy(data, readpubek, sizeof(readpubek));
-
- err = transmit_cmd(chip, data, READ_PUBEK_RESULT_SIZE,
+ tpm_cmd.header.in = tpm_readpubek_header;
+ err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
"attempting to read the PUBEK");
if (err)
goto out;
@@ -812,7 +743,7 @@ ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
256 byte modulus
ignore checksum 20 bytes
*/
-
+ data = tpm_cmd.params.readpubek_out_buffer;
str +=
sprintf(str,
"Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
@@ -832,65 +763,33 @@ ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
}
out:
rc = str - buf;
- kfree(data);
return rc;
}
EXPORT_SYMBOL_GPL(tpm_show_pubek);

-#define CAP_VERSION_1_1 6
-#define CAP_VERSION_1_2 0x1A
-#define CAP_VERSION_IDX 13
-static const u8 cap_version[] = {
- 0, 193, /* TPM_TAG_RQU_COMMAND */
- 0, 0, 0, 18, /* length */
- 0, 0, 0, 101, /* TPM_ORD_GetCapability */
- 0, 0, 0, 0,
- 0, 0, 0, 0
-};

ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
char *buf)
{
- u8 *data;
+ cap_t cap;
ssize_t rc;
char *str = buf;

- struct tpm_chip *chip = dev_get_drvdata(dev);
- if (chip == NULL)
- return -ENODEV;
-
- data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- memcpy(data, tpm_cap, sizeof(tpm_cap));
- data[TPM_CAP_IDX] = TPM_CAP_PROP;
- data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
-
- rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
+ rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
"attempting to determine the manufacturer");
- if (rc) {
- kfree(data);
+ if (rc)
return 0;
- }
-
str += sprintf(str, "Manufacturer: 0x%x\n",
- be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
+ be32_to_cpu(cap.manufacturer_id));

- memcpy(data, cap_version, sizeof(cap_version));
- data[CAP_VERSION_IDX] = CAP_VERSION_1_1;
- rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
- "attempting to determine the 1.1 version");
+ rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
+ "attempting to determine the 1.1 version");
if (rc)
- goto out;
-
+ return 0;
str += sprintf(str,
"TCG version: %d.%d\nFirmware version: %d.%d\n",
- (int) data[14], (int) data[15], (int) data[16],
- (int) data[17]);
-
-out:
- kfree(data);
+ cap.tpm_version.Major, cap.tpm_version.Minor,
+ cap.tpm_version.revMajor, cap.tpm_version.revMinor);
return str - buf;
}
EXPORT_SYMBOL_GPL(tpm_show_caps);
@@ -898,51 +797,25 @@ EXPORT_SYMBOL_GPL(tpm_show_caps);
ssize_t tpm_show_caps_1_2(struct device * dev,
struct device_attribute * attr, char *buf)
{
- u8 *data;
- ssize_t len;
+ cap_t cap;
+ ssize_t rc;
char *str = buf;

- struct tpm_chip *chip = dev_get_drvdata(dev);
- if (chip == NULL)
- return -ENODEV;
-
- data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- memcpy(data, tpm_cap, sizeof(tpm_cap));
- data[TPM_CAP_IDX] = TPM_CAP_PROP;
- data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
-
- len = tpm_transmit(chip, data, TPM_INTERNAL_RESULT_SIZE);
- if (len <= TPM_ERROR_SIZE) {
- dev_dbg(chip->dev, "A TPM error (%d) occurred "
- "attempting to determine the manufacturer\n",
- be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
- kfree(data);
+ rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
+ "attempting to determine the manufacturer");
+ if (rc)
return 0;
- }
-
str += sprintf(str, "Manufacturer: 0x%x\n",
- be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
-
- memcpy(data, cap_version, sizeof(cap_version));
- data[CAP_VERSION_IDX] = CAP_VERSION_1_2;
-
- len = tpm_transmit(chip, data, TPM_INTERNAL_RESULT_SIZE);
- if (len <= TPM_ERROR_SIZE) {
- dev_err(chip->dev, "A TPM error (%d) occurred "
- "attempting to determine the 1.2 version\n",
- be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
- goto out;
- }
+ be32_to_cpu(cap.manufacturer_id));
+ rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
+ "attempting to determine the 1.2 version");
+ if (rc)
+ return 0;
str += sprintf(str,
"TCG version: %d.%d\nFirmware version: %d.%d\n",
- (int) data[16], (int) data[17], (int) data[18],
- (int) data[19]);
-
-out:
- kfree(data);
+ cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor,
+ cap.tpm_version_1_2.revMajor,
+ cap.tpm_version_1_2.revMinor);
return str - buf;
}
EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 8e30df4..d64f6b7 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -123,6 +123,130 @@ static inline void tpm_write_index(int base, int index, int value)
outb(index, base);
outb(value & 0xFF, base+1);
}
+struct tpm_input_header {
+ __be16 tag;
+ __be32 length;
+ __be32 ordinal;
+}__attribute__((packed));
+
+struct tpm_output_header {
+ __be16 tag;
+ __be32 length;
+ __be32 return_code;
+}__attribute__((packed));
+
+struct stclear_flags_t {
+ __be16 tag;
+ u8 deactivated;
+ u8 disableForceClear;
+ u8 physicalPresence;
+ u8 physicalPresenceLock;
+ u8 bGlobalLock;
+}__attribute__((packed));
+
+struct tpm_version_t {
+ u8 Major;
+ u8 Minor;
+ u8 revMajor;
+ u8 revMinor;
+}__attribute__((packed));
+
+struct tpm_version_1_2_t {
+ __be16 tag;
+ u8 Major;
+ u8 Minor;
+ u8 revMajor;
+ u8 revMinor;
+}__attribute__((packed));
+
+struct timeout_t {
+ __be32 a;
+ __be32 b;
+ __be32 c;
+ __be32 d;
+}__attribute__((packed));
+
+struct duration_t {
+ __be32 tpm_short;
+ __be32 tpm_medium;
+ __be32 tpm_long;
+}__attribute__((packed));
+
+struct permanent_flags_t {
+ __be16 tag;
+ u8 disable;
+ u8 ownership;
+ u8 deactivated;
+ u8 readPubek;
+ u8 disableOwnerClear;
+ u8 allowMaintenance;
+ u8 physicalPresenceLifetimeLock;
+ u8 physicalPresenceHWEnable;
+ u8 physicalPresenceCMDEnable;
+ u8 CEKPUsed;
+ u8 TPMpost;
+ u8 TPMpostLock;
+ u8 FIPS;
+ u8 operator;
+ u8 enableRevokeEK;
+ u8 nvLocked;
+ u8 readSRKPub;
+ u8 tpmEstablished;
+ u8 maintenanceDone;
+ u8 disableFullDALogicInfo;
+}__attribute__((packed));
+
+typedef union {
+ struct permanent_flags_t perm_flags;
+ struct stclear_flags_t stclear_flags;
+ bool owned;
+ __be32 num_pcrs;
+ struct tpm_version_t tpm_version;
+ struct tpm_version_1_2_t tpm_version_1_2;
+ __be32 manufacturer_id;
+ struct timeout_t timeout;
+ struct duration_t duration;
+} cap_t;
+
+struct tpm_getcap_params_in {
+ __be32 cap;
+ __be32 subcap_size;
+ __be32 subcap;
+}__attribute__((packed));
+
+struct tpm_getcap_params_out {
+ __be32 cap_size;
+ cap_t cap;
+}__attribute__((packed));
+
+struct tpm_readpubek_params_out {
+ u8 algorithm[4];
+ u8 encscheme[2];
+ u8 sigscheme[2];
+ u8 parameters[12]; /*assuming RSA*/
+ __be32 keysize;
+ u8 modulus[256];
+ u8 checksum[20];
+}__attribute__((packed));
+
+typedef union {
+ struct tpm_input_header in;
+ struct tpm_output_header out;
+} tpm_cmd_header;
+
+typedef union {
+ struct tpm_getcap_params_out getcap_out;
+ struct tpm_readpubek_params_out readpubek_out;
+ u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
+ struct tpm_getcap_params_in getcap_in;
+} tpm_cmd_params;
+
+struct tpm_cmd_t {
+ tpm_cmd_header header;
+ tpm_cmd_params params;
+}__attribute__((packed));
+
+ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);

extern void tpm_get_timeouts(struct tpm_chip *);
extern void tpm_gen_interrupt(struct tpm_chip *);
--
1.5.6.3


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