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Merge branch 'for-james' of git://github.com/srajiv/tpm into next

This commit is contained in:
James Morris 2011-11-17 10:08:37 +11:00
parent 7845bc3964 b9e3238aa3
commit 8077e8b059
4 changed files with 153 additions and 81 deletions
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2
drivers/char/tpm/Kconfig
View File

@ -27,6 +27,7 @@ if TCG_TPM
config TCG_TIS
tristate "TPM Interface Specification 1.2 Interface"
depends on X86
---help---
If you have a TPM security chip that is compliant with the
TCG TIS 1.2 TPM specification say Yes and it will be accessible
@ -35,6 +36,7 @@ config TCG_TIS
config TCG_NSC
tristate "National Semiconductor TPM Interface"
depends on X86
---help---
If you have a TPM security chip from National Semiconductor
say Yes and it will be accessible from within Linux. To

139
drivers/char/tpm/tpm.c
View File

@ -27,6 +27,7 @@
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/freezer.h>
#include "tpm.h"
@ -440,7 +441,6 @@ out:
}
#define TPM_DIGEST_SIZE 20
#define TPM_ERROR_SIZE 10
#define TPM_RET_CODE_IDX 6
enum tpm_capabilities {
@ -469,12 +469,14 @@ static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
len = tpm_transmit(chip,(u8 *) cmd, len);
if (len < 0)
return len;
if (len == TPM_ERROR_SIZE) {
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;
else if (len < TPM_HEADER_SIZE)
return -EFAULT;
err = be32_to_cpu(cmd->header.out.return_code);
if (err != 0)
dev_err(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
return err;
}
#define TPM_INTERNAL_RESULT_SIZE 200
@ -530,7 +532,7 @@ void tpm_gen_interrupt(struct tpm_chip *chip)
}
EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
void tpm_get_timeouts(struct tpm_chip *chip)
int tpm_get_timeouts(struct tpm_chip *chip)
{
struct tpm_cmd_t tpm_cmd;
struct timeout_t *timeout_cap;
@ -552,7 +554,7 @@ void tpm_get_timeouts(struct tpm_chip *chip)
if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
be32_to_cpu(tpm_cmd.header.out.length)
!= sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
return;
return -EINVAL;
timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
/* Don't overwrite default if value is 0 */
@ -583,12 +585,12 @@ duration:
rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
"attempting to determine the durations");
if (rc)
return;
return rc;
if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
be32_to_cpu(tpm_cmd.header.out.length)
!= sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
return;
return -EINVAL;
duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
chip->vendor.duration[TPM_SHORT] =
@ -610,20 +612,36 @@ duration:
chip->vendor.duration_adjusted = true;
dev_info(chip->dev, "Adjusting TPM timeout parameters.");
}
return 0;
}
EXPORT_SYMBOL_GPL(tpm_get_timeouts);
void tpm_continue_selftest(struct tpm_chip *chip)
{
u8 data[] = {
0, 193, /* TPM_TAG_RQU_COMMAND */
0, 0, 0, 10, /* length */
0, 0, 0, 83, /* TPM_ORD_ContinueSelfTest */
};
#define TPM_ORD_CONTINUE_SELFTEST 83
#define CONTINUE_SELFTEST_RESULT_SIZE 10
tpm_transmit(chip, data, sizeof(data));
static struct tpm_input_header continue_selftest_header = {
.tag = TPM_TAG_RQU_COMMAND,
.length = cpu_to_be32(10),
.ordinal = cpu_to_be32(TPM_ORD_CONTINUE_SELFTEST),
};
/**
* tpm_continue_selftest -- run TPM's selftest
* @chip: TPM chip to use
*
* Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
* a TPM error code.
*/
static int tpm_continue_selftest(struct tpm_chip *chip)
{
int rc;
struct tpm_cmd_t cmd;
cmd.header.in = continue_selftest_header;
rc = transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
"continue selftest");
return rc;
}
EXPORT_SYMBOL_GPL(tpm_continue_selftest);
ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
char *buf)
@ -718,7 +736,7 @@ static struct tpm_input_header pcrread_header = {
.ordinal = TPM_ORDINAL_PCRREAD
};
int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
static int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
{
int rc;
struct tpm_cmd_t cmd;
@ -798,6 +816,45 @@ int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
}
EXPORT_SYMBOL_GPL(tpm_pcr_extend);
/**
* tpm_do_selftest - have the TPM continue its selftest and wait until it
* can receive further commands
* @chip: TPM chip to use
*
* Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
* a TPM error code.
*/
int tpm_do_selftest(struct tpm_chip *chip)
{
int rc;
u8 digest[TPM_DIGEST_SIZE];
unsigned int loops;
unsigned int delay_msec = 1000;
unsigned long duration;
duration = tpm_calc_ordinal_duration(chip,
TPM_ORD_CONTINUE_SELFTEST);
loops = jiffies_to_msecs(duration) / delay_msec;
rc = tpm_continue_selftest(chip);
/* This may fail if there was no TPM driver during a suspend/resume
* cycle; some may return 10 (BAD_ORDINAL), others 28 (FAILEDSELFTEST)
*/
if (rc)
return rc;
do {
rc = __tpm_pcr_read(chip, 0, digest);
if (rc != TPM_WARN_DOING_SELFTEST)
return rc;
msleep(delay_msec);
} while (--loops > 0);
return rc;
}
EXPORT_SYMBOL_GPL(tpm_do_selftest);
int tpm_send(u32 chip_num, void *cmd, size_t buflen)
{
struct tpm_chip *chip;
@ -1005,6 +1062,46 @@ ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
}
EXPORT_SYMBOL_GPL(tpm_store_cancel);
int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
wait_queue_head_t *queue)
{
unsigned long stop;
long rc;
u8 status;
/* check current status */
status = chip->vendor.status(chip);
if ((status & mask) == mask)
return 0;
stop = jiffies + timeout;
if (chip->vendor.irq) {
again:
timeout = stop - jiffies;
if ((long)timeout <= 0)
return -ETIME;
rc = wait_event_interruptible_timeout(*queue,
((chip->vendor.status(chip)
& mask) == mask),
timeout);
if (rc > 0)
return 0;
if (rc == -ERESTARTSYS && freezing(current)) {
clear_thread_flag(TIF_SIGPENDING);
goto again;
}
} else {
do {
msleep(TPM_TIMEOUT);
status = chip->vendor.status(chip);
if ((status & mask) == mask)
return 0;
} while (time_before(jiffies, stop));
}
return -ETIME;
}
EXPORT_SYMBOL_GPL(wait_for_tpm_stat);
/*
* Device file system interface to the TPM
*

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

@ -38,6 +38,8 @@ enum tpm_addr {
TPM_ADDR = 0x4E,
};
#define TPM_WARN_DOING_SELFTEST 0x802
#define TPM_HEADER_SIZE 10
extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
char *);
extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
@ -279,9 +281,9 @@ struct tpm_cmd_t {
ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
extern void tpm_get_timeouts(struct tpm_chip *);
extern int tpm_get_timeouts(struct tpm_chip *);
extern void tpm_gen_interrupt(struct tpm_chip *);
extern void tpm_continue_selftest(struct tpm_chip *);
extern int tpm_do_selftest(struct tpm_chip *);
extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
extern struct tpm_chip* tpm_register_hardware(struct device *,
const struct tpm_vendor_specific *);
@ -294,7 +296,8 @@ extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
extern void tpm_remove_hardware(struct device *);
extern int tpm_pm_suspend(struct device *, pm_message_t);
extern int tpm_pm_resume(struct device *);
extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
wait_queue_head_t *);
#ifdef CONFIG_ACPI
extern struct dentry ** tpm_bios_log_setup(char *);
extern void tpm_bios_log_teardown(struct dentry **);

84
drivers/char/tpm/tpm_tis.c
View File

@ -29,8 +29,6 @@
#include <linux/freezer.h>
#include "tpm.h"
#define TPM_HEADER_SIZE 10
enum tis_access {
TPM_ACCESS_VALID = 0x80,
TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
@ -193,54 +191,14 @@ static int get_burstcount(struct tpm_chip *chip)
return -EBUSY;
}
static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
wait_queue_head_t *queue)
{
unsigned long stop;
long rc;
u8 status;
/* check current status */
status = tpm_tis_status(chip);
if ((status & mask) == mask)
return 0;
stop = jiffies + timeout;
if (chip->vendor.irq) {
again:
timeout = stop - jiffies;
if ((long)timeout <= 0)
return -ETIME;
rc = wait_event_interruptible_timeout(*queue,
((tpm_tis_status
(chip) & mask) ==
mask), timeout);
if (rc > 0)
return 0;
if (rc == -ERESTARTSYS && freezing(current)) {
clear_thread_flag(TIF_SIGPENDING);
goto again;
}
} else {
do {
msleep(TPM_TIMEOUT);
status = tpm_tis_status(chip);
if ((status & mask) == mask)
return 0;
} while (time_before(jiffies, stop));
}
return -ETIME;
}
static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
{
int size = 0, burstcnt;
while (size < count &&
wait_for_stat(chip,
TPM_STS_DATA_AVAIL | TPM_STS_VALID,
chip->vendor.timeout_c,
&chip->vendor.read_queue)
wait_for_tpm_stat(chip,
TPM_STS_DATA_AVAIL | TPM_STS_VALID,
chip->vendor.timeout_c,
&chip->vendor.read_queue)
== 0) {
burstcnt = get_burstcount(chip);
for (; burstcnt > 0 && size < count; burstcnt--)
@ -282,8 +240,8 @@ static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
goto out;
}
wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
&chip->vendor.int_queue);
wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
&chip->vendor.int_queue);
status = tpm_tis_status(chip);
if (status & TPM_STS_DATA_AVAIL) { /* retry? */
dev_err(chip->dev, "Error left over data\n");
@ -317,7 +275,7 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
status = tpm_tis_status(chip);
if ((status & TPM_STS_COMMAND_READY) == 0) {
tpm_tis_ready(chip);
if (wait_for_stat
if (wait_for_tpm_stat
(chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
&chip->vendor.int_queue) < 0) {
rc = -ETIME;
@ -333,8 +291,8 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
count++;
}
wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
&chip->vendor.int_queue);
wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
&chip->vendor.int_queue);
status = tpm_tis_status(chip);
if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) {
rc = -EIO;
@ -345,8 +303,8 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
/* write last byte */
iowrite8(buf[count],
chip->vendor.iobase + TPM_DATA_FIFO(chip->vendor.locality));
wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
&chip->vendor.int_queue);
wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
&chip->vendor.int_queue);
status = tpm_tis_status(chip);
if ((status & TPM_STS_DATA_EXPECT) != 0) {
rc = -EIO;
@ -381,7 +339,7 @@ static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
if (chip->vendor.irq) {
ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
if (wait_for_stat
if (wait_for_tpm_stat
(chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
tpm_calc_ordinal_duration(chip, ordinal),
&chip->vendor.read_queue) < 0) {
@ -432,6 +390,9 @@ static int probe_itpm(struct tpm_chip *chip)
out:
itpm = rem_itpm;
tpm_tis_ready(chip);
/* some TPMs need a break here otherwise they will not work
* correctly on the immediately subsequent command */
msleep(chip->vendor.timeout_b);
release_locality(chip, chip->vendor.locality, 0);
return rc;
@ -614,7 +575,17 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
dev_dbg(dev, "\tData Avail Int Support\n");
/* get the timeouts before testing for irqs */
tpm_get_timeouts(chip);
if (tpm_get_timeouts(chip)) {
dev_err(dev, "Could not get TPM timeouts and durations\n");
rc = -ENODEV;
goto out_err;
}
if (tpm_do_selftest(chip)) {
dev_err(dev, "TPM self test failed\n");
rc = -ENODEV;
goto out_err;
}
/* INTERRUPT Setup */
init_waitqueue_head(&chip->vendor.read_queue);
@ -722,7 +693,6 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
list_add(&chip->vendor.list, &tis_chips);
spin_unlock(&tis_lock);
tpm_continue_selftest(chip);
return 0;
out_err:
@ -790,7 +760,7 @@ static int tpm_tis_pnp_resume(struct pnp_dev *dev)
ret = tpm_pm_resume(&dev->dev);
if (!ret)
tpm_continue_selftest(chip);
tpm_do_selftest(chip);
return ret;
}