+++ /dev/null
-/*
- * Copyright (C) 2004 IBM Corporation
- *
- * Authors:
- * Leendert van Doorn <leendert@watson.ibm.com>
- * Dave Safford <safford@watson.ibm.com>
- * Reiner Sailer <sailer@watson.ibm.com>
- * Kylene Hall <kjhall@us.ibm.com>
- *
- * Maintained by: <tpmdd-devel@lists.sourceforge.net>
- *
- * Device driver for TCG/TCPA TPM (trusted platform module).
- * Specifications at www.trustedcomputinggroup.org
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation, version 2 of the
- * License.
- *
- * Note, the TPM chip is not interrupt driven (only polling)
- * and can have very long timeouts (minutes!). Hence the unusual
- * calls to msleep.
- *
- */
-
-#include <linux/poll.h>
-#include <linux/slab.h>
-#include <linux/mutex.h>
-#include <linux/spinlock.h>
-#include <linux/freezer.h>
-
-#include "tpm.h"
-#include "tpm_eventlog.h"
-
-enum tpm_duration {
- TPM_SHORT = 0,
- TPM_MEDIUM = 1,
- TPM_LONG = 2,
- TPM_UNDEFINED,
-};
-
-#define TPM_MAX_ORDINAL 243
-#define TSC_MAX_ORDINAL 12
-#define TPM_PROTECTED_COMMAND 0x00
-#define TPM_CONNECTION_COMMAND 0x40
-
-/*
- * Bug workaround - some TPM's don't flush the most
- * recently changed pcr on suspend, so force the flush
- * with an extend to the selected _unused_ non-volatile pcr.
- */
-static int tpm_suspend_pcr;
-module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644);
-MODULE_PARM_DESC(suspend_pcr,
- "PCR to use for dummy writes to faciltate flush on suspend.");
-
-static LIST_HEAD(tpm_chip_list);
-static DEFINE_SPINLOCK(driver_lock);
-static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
-
-/*
- * Array with one entry per ordinal defining the maximum amount
- * of time the chip could take to return the result. The ordinal
- * designation of short, medium or long is defined in a table in
- * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
- * values of the SHORT, MEDIUM, and LONG durations are retrieved
- * from the chip during initialization with a call to tpm_get_timeouts.
- */
-static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
- TPM_UNDEFINED, /* 0 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED, /* 5 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT, /* 10 */
- TPM_SHORT,
- TPM_MEDIUM,
- TPM_LONG,
- TPM_LONG,
- TPM_MEDIUM, /* 15 */
- TPM_SHORT,
- TPM_SHORT,
- TPM_MEDIUM,
- TPM_LONG,
- TPM_SHORT, /* 20 */
- TPM_SHORT,
- TPM_MEDIUM,
- TPM_MEDIUM,
- TPM_MEDIUM,
- TPM_SHORT, /* 25 */
- TPM_SHORT,
- TPM_MEDIUM,
- TPM_SHORT,
- TPM_SHORT,
- TPM_MEDIUM, /* 30 */
- TPM_LONG,
- TPM_MEDIUM,
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT, /* 35 */
- TPM_MEDIUM,
- TPM_MEDIUM,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_MEDIUM, /* 40 */
- TPM_LONG,
- TPM_MEDIUM,
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT, /* 45 */
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT,
- TPM_LONG,
- TPM_MEDIUM, /* 50 */
- TPM_MEDIUM,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED, /* 55 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_MEDIUM, /* 60 */
- TPM_MEDIUM,
- TPM_MEDIUM,
- TPM_SHORT,
- TPM_SHORT,
- TPM_MEDIUM, /* 65 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT, /* 70 */
- TPM_SHORT,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED, /* 75 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_LONG, /* 80 */
- TPM_UNDEFINED,
- TPM_MEDIUM,
- TPM_LONG,
- TPM_SHORT,
- TPM_UNDEFINED, /* 85 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT, /* 90 */
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT,
- TPM_UNDEFINED, /* 95 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_MEDIUM, /* 100 */
- TPM_SHORT,
- TPM_SHORT,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED, /* 105 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT, /* 110 */
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT, /* 115 */
- TPM_SHORT,
- TPM_SHORT,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_LONG, /* 120 */
- TPM_LONG,
- TPM_MEDIUM,
- TPM_UNDEFINED,
- TPM_SHORT,
- TPM_SHORT, /* 125 */
- TPM_SHORT,
- TPM_LONG,
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT, /* 130 */
- TPM_MEDIUM,
- TPM_UNDEFINED,
- TPM_SHORT,
- TPM_MEDIUM,
- TPM_UNDEFINED, /* 135 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT, /* 140 */
- TPM_SHORT,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED, /* 145 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT, /* 150 */
- TPM_MEDIUM,
- TPM_MEDIUM,
- TPM_SHORT,
- TPM_SHORT,
- TPM_UNDEFINED, /* 155 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT, /* 160 */
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT,
- TPM_UNDEFINED,
- TPM_UNDEFINED, /* 165 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_LONG, /* 170 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED, /* 175 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_MEDIUM, /* 180 */
- TPM_SHORT,
- TPM_MEDIUM,
- TPM_MEDIUM,
- TPM_MEDIUM,
- TPM_MEDIUM, /* 185 */
- TPM_SHORT,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED, /* 190 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED, /* 195 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT, /* 200 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT,
- TPM_SHORT, /* 205 */
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT,
- TPM_MEDIUM, /* 210 */
- TPM_UNDEFINED,
- TPM_MEDIUM,
- TPM_MEDIUM,
- TPM_MEDIUM,
- TPM_UNDEFINED, /* 215 */
- TPM_MEDIUM,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT,
- TPM_SHORT, /* 220 */
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT,
- TPM_SHORT,
- TPM_UNDEFINED, /* 225 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT, /* 230 */
- TPM_LONG,
- TPM_MEDIUM,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED, /* 235 */
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_UNDEFINED,
- TPM_SHORT, /* 240 */
- TPM_UNDEFINED,
- TPM_MEDIUM,
-};
-
-static void user_reader_timeout(unsigned long ptr)
-{
- struct tpm_chip *chip = (struct tpm_chip *) ptr;
-
- schedule_work(&chip->work);
-}
-
-static void timeout_work(struct work_struct *work)
-{
- struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
-
- mutex_lock(&chip->buffer_mutex);
- atomic_set(&chip->data_pending, 0);
- memset(chip->data_buffer, 0, TPM_BUFSIZE);
- mutex_unlock(&chip->buffer_mutex);
-}
-
-/*
- * Returns max number of jiffies to wait
- */
-unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
- u32 ordinal)
-{
- int duration_idx = TPM_UNDEFINED;
- int duration = 0;
- u8 category = (ordinal >> 24) & 0xFF;
-
- if ((category == TPM_PROTECTED_COMMAND && ordinal < TPM_MAX_ORDINAL) ||
- (category == TPM_CONNECTION_COMMAND && ordinal < TSC_MAX_ORDINAL))
- duration_idx = tpm_ordinal_duration[ordinal];
-
- if (duration_idx != TPM_UNDEFINED)
- duration = chip->vendor.duration[duration_idx];
- if (duration <= 0)
- return 2 * 60 * HZ;
- else
- return duration;
-}
-EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
-
-/*
- * Internal kernel interface to transmit TPM commands
- */
-static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
- size_t bufsiz)
-{
- ssize_t rc;
- u32 count, ordinal;
- unsigned long stop;
-
- if (bufsiz > TPM_BUFSIZE)
- bufsiz = TPM_BUFSIZE;
-
- count = be32_to_cpu(*((__be32 *) (buf + 2)));
- ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
- if (count == 0)
- return -ENODATA;
- if (count > bufsiz) {
- dev_err(chip->dev,
- "invalid count value %x %zx\n", count, bufsiz);
- return -E2BIG;
- }
-
- mutex_lock(&chip->tpm_mutex);
-
- rc = chip->vendor.send(chip, (u8 *) buf, count);
- if (rc < 0) {
- dev_err(chip->dev,
- "tpm_transmit: tpm_send: error %zd\n", rc);
- goto out;
- }
-
- if (chip->vendor.irq)
- goto out_recv;
-
- stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
- do {
- u8 status = chip->vendor.status(chip);
- if ((status & chip->vendor.req_complete_mask) ==
- chip->vendor.req_complete_val)
- goto out_recv;
-
- if (chip->vendor.req_canceled(chip, status)) {
- dev_err(chip->dev, "Operation Canceled\n");
- rc = -ECANCELED;
- goto out;
- }
-
- msleep(TPM_TIMEOUT); /* CHECK */
- rmb();
- } while (time_before(jiffies, stop));
-
- chip->vendor.cancel(chip);
- dev_err(chip->dev, "Operation Timed out\n");
- rc = -ETIME;
- goto out;
-
-out_recv:
- rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
- if (rc < 0)
- dev_err(chip->dev,
- "tpm_transmit: tpm_recv: error %zd\n", rc);
-out:
- mutex_unlock(&chip->tpm_mutex);
- return rc;
-}
-
-#define TPM_DIGEST_SIZE 20
-#define TPM_RET_CODE_IDX 6
-
-enum tpm_capabilities {
- 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 = 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),
-
-};
-
-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, (u8 *) cmd, len);
- if (len < 0)
- return len;
- else if (len < TPM_HEADER_SIZE)
- return -EFAULT;
-
- err = be32_to_cpu(cmd->header.out.return_code);
- if (err != 0 && desc)
- dev_err(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
-
- return err;
-}
-
-#define TPM_INTERNAL_RESULT_SIZE 200
-#define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
-#define TPM_ORD_GET_CAP cpu_to_be32(101)
-#define TPM_ORD_GET_RANDOM cpu_to_be32(70)
-
-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)
-{
- struct tpm_cmd_t tpm_cmd;
- ssize_t rc;
-
- 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, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
- "attempting to determine the timeouts");
-}
-EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
-
-#define TPM_ORD_STARTUP cpu_to_be32(153)
-#define TPM_ST_CLEAR cpu_to_be16(1)
-#define TPM_ST_STATE cpu_to_be16(2)
-#define TPM_ST_DEACTIVATED cpu_to_be16(3)
-static const struct tpm_input_header tpm_startup_header = {
- .tag = TPM_TAG_RQU_COMMAND,
- .length = cpu_to_be32(12),
- .ordinal = TPM_ORD_STARTUP
-};
-
-static int tpm_startup(struct tpm_chip *chip, __be16 startup_type)
-{
- struct tpm_cmd_t start_cmd;
- start_cmd.header.in = tpm_startup_header;
- start_cmd.params.startup_in.startup_type = startup_type;
- return transmit_cmd(chip, &start_cmd, TPM_INTERNAL_RESULT_SIZE,
- "attempting to start the TPM");
-}
-
-int tpm_get_timeouts(struct tpm_chip *chip)
-{
- struct tpm_cmd_t tpm_cmd;
- struct timeout_t *timeout_cap;
- struct duration_t *duration_cap;
- ssize_t rc;
- u32 timeout;
- unsigned int scale = 1;
-
- 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, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, NULL);
-
- if (rc == TPM_ERR_INVALID_POSTINIT) {
- /* The TPM is not started, we are the first to talk to it.
- Execute a startup command. */
- dev_info(chip->dev, "Issuing TPM_STARTUP");
- if (tpm_startup(chip, TPM_ST_CLEAR))
- return rc;
-
- 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, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
- NULL);
- }
- if (rc) {
- dev_err(chip->dev,
- "A TPM error (%zd) occurred attempting to determine the timeouts\n",
- rc);
- goto duration;
- }
-
- 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 -EINVAL;
-
- timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
- /* Don't overwrite default if value is 0 */
- timeout = be32_to_cpu(timeout_cap->a);
- if (timeout && timeout < 1000) {
- /* timeouts in msec rather usec */
- scale = 1000;
- chip->vendor.timeout_adjusted = true;
- }
- if (timeout)
- chip->vendor.timeout_a = usecs_to_jiffies(timeout * scale);
- timeout = be32_to_cpu(timeout_cap->b);
- if (timeout)
- chip->vendor.timeout_b = usecs_to_jiffies(timeout * scale);
- timeout = be32_to_cpu(timeout_cap->c);
- if (timeout)
- chip->vendor.timeout_c = usecs_to_jiffies(timeout * scale);
- timeout = be32_to_cpu(timeout_cap->d);
- if (timeout)
- chip->vendor.timeout_d = usecs_to_jiffies(timeout * scale);
-
-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, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
- "attempting to determine the durations");
- if (rc)
- 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 -EINVAL;
-
- duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
- chip->vendor.duration[TPM_SHORT] =
- usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
- chip->vendor.duration[TPM_MEDIUM] =
- usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
- chip->vendor.duration[TPM_LONG] =
- usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
-
- /* 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.
- * We also scale the TPM_MEDIUM and -_LONG values by 1000.
- */
- if (chip->vendor.duration[TPM_SHORT] < (HZ / 100)) {
- chip->vendor.duration[TPM_SHORT] = HZ;
- chip->vendor.duration[TPM_MEDIUM] *= 1000;
- chip->vendor.duration[TPM_LONG] *= 1000;
- chip->vendor.duration_adjusted = true;
- dev_info(chip->dev, "Adjusting TPM timeout parameters.");
- }
- return 0;
-}
-EXPORT_SYMBOL_GPL(tpm_get_timeouts);
-
-#define TPM_ORD_CONTINUE_SELFTEST 83
-#define CONTINUE_SELFTEST_RESULT_SIZE 10
-
-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;
-}
-
-ssize_t tpm_show_enabled(struct device *dev, struct device_attribute *attr,
- char *buf)
-{
- cap_t cap;
- ssize_t rc;
-
- 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", !cap.perm_flags.disable);
- return rc;
-}
-EXPORT_SYMBOL_GPL(tpm_show_enabled);
-
-ssize_t tpm_show_active(struct device *dev, struct device_attribute *attr,
- char *buf)
-{
- cap_t cap;
- ssize_t rc;
-
- 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", !cap.perm_flags.deactivated);
- return rc;
-}
-EXPORT_SYMBOL_GPL(tpm_show_active);
-
-ssize_t tpm_show_owned(struct device *dev, struct device_attribute *attr,
- char *buf)
-{
- cap_t cap;
- ssize_t rc;
-
- rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
- "attempting to determine the owner state");
- if (rc)
- return 0;
-
- rc = sprintf(buf, "%d\n", cap.owned);
- return rc;
-}
-EXPORT_SYMBOL_GPL(tpm_show_owned);
-
-ssize_t tpm_show_temp_deactivated(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- cap_t cap;
- ssize_t rc;
-
- rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
- "attempting to determine the temporary state");
- if (rc)
- return 0;
-
- rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
- return rc;
-}
-EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
-
-/*
- * tpm_chip_find_get - return tpm_chip for given chip number
- */
-static struct tpm_chip *tpm_chip_find_get(int chip_num)
-{
- struct tpm_chip *pos, *chip = NULL;
-
- rcu_read_lock();
- list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
- if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
- continue;
-
- if (try_module_get(pos->dev->driver->owner)) {
- chip = pos;
- break;
- }
- }
- rcu_read_unlock();
- return chip;
-}
-
-#define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
-#define READ_PCR_RESULT_SIZE 30
-static struct tpm_input_header pcrread_header = {
- .tag = TPM_TAG_RQU_COMMAND,
- .length = cpu_to_be32(14),
- .ordinal = TPM_ORDINAL_PCRREAD
-};
-
-static int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
-{
- int rc;
- struct tpm_cmd_t cmd;
-
- cmd.header.in = pcrread_header;
- cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
- rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
- "attempting to read a pcr value");
-
- if (rc == 0)
- memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
- TPM_DIGEST_SIZE);
- return rc;
-}
-
-/**
- * tpm_pcr_read - read a pcr value
- * @chip_num: tpm idx # or ANY
- * @pcr_idx: pcr idx to retrieve
- * @res_buf: TPM_PCR value
- * size of res_buf is 20 bytes (or NULL if you don't care)
- *
- * The TPM driver should be built-in, but for whatever reason it
- * isn't, protect against the chip disappearing, by incrementing
- * the module usage count.
- */
-int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
-{
- struct tpm_chip *chip;
- int rc;
-
- chip = tpm_chip_find_get(chip_num);
- if (chip == NULL)
- return -ENODEV;
- rc = __tpm_pcr_read(chip, pcr_idx, res_buf);
- tpm_chip_put(chip);
- return rc;
-}
-EXPORT_SYMBOL_GPL(tpm_pcr_read);
-
-/**
- * tpm_pcr_extend - extend pcr value with hash
- * @chip_num: tpm idx # or AN&
- * @pcr_idx: pcr idx to extend
- * @hash: hash value used to extend pcr value
- *
- * The TPM driver should be built-in, but for whatever reason it
- * isn't, protect against the chip disappearing, by incrementing
- * the module usage count.
- */
-#define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
-#define EXTEND_PCR_RESULT_SIZE 34
-static struct tpm_input_header pcrextend_header = {
- .tag = TPM_TAG_RQU_COMMAND,
- .length = cpu_to_be32(34),
- .ordinal = TPM_ORD_PCR_EXTEND
-};
-
-int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
-{
- struct tpm_cmd_t cmd;
- int rc;
- struct tpm_chip *chip;
-
- chip = tpm_chip_find_get(chip_num);
- if (chip == NULL)
- return -ENODEV;
-
- cmd.header.in = pcrextend_header;
- cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
- memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
- rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
- "attempting extend a PCR value");
-
- tpm_chip_put(chip);
- return rc;
-}
-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;
- unsigned int loops;
- unsigned int delay_msec = 100;
- unsigned long duration;
- struct tpm_cmd_t cmd;
-
- 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 {
- /* Attempt to read a PCR value */
- cmd.header.in = pcrread_header;
- cmd.params.pcrread_in.pcr_idx = cpu_to_be32(0);
- rc = tpm_transmit(chip, (u8 *) &cmd, READ_PCR_RESULT_SIZE);
- /* Some buggy TPMs will not respond to tpm_tis_ready() for
- * around 300ms while the self test is ongoing, keep trying
- * until the self test duration expires. */
- if (rc == -ETIME) {
- dev_info(chip->dev, HW_ERR "TPM command timed out during continue self test");
- msleep(delay_msec);
- continue;
- }
-
- if (rc < TPM_HEADER_SIZE)
- return -EFAULT;
-
- rc = be32_to_cpu(cmd.header.out.return_code);
- if (rc == TPM_ERR_DISABLED || rc == TPM_ERR_DEACTIVATED) {
- dev_info(chip->dev,
- "TPM is disabled/deactivated (0x%X)\n", rc);
- /* TPM is disabled and/or deactivated; driver can
- * proceed and TPM does handle commands for
- * suspend/resume correctly
- */
- return 0;
- }
- 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;
- int rc;
-
- chip = tpm_chip_find_get(chip_num);
- if (chip == NULL)
- return -ENODEV;
-
- rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
-
- tpm_chip_put(chip);
- return rc;
-}
-EXPORT_SYMBOL_GPL(tpm_send);
-
-ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
- char *buf)
-{
- cap_t cap;
- u8 digest[TPM_DIGEST_SIZE];
- ssize_t rc;
- int i, j, num_pcrs;
- char *str = buf;
- struct tpm_chip *chip = dev_get_drvdata(dev);
-
- rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
- "attempting to determine the number of PCRS");
- if (rc)
- return 0;
-
- num_pcrs = be32_to_cpu(cap.num_pcrs);
- for (i = 0; i < num_pcrs; i++) {
- rc = __tpm_pcr_read(chip, i, digest);
- if (rc)
- break;
- str += sprintf(str, "PCR-%02d: ", i);
- for (j = 0; j < TPM_DIGEST_SIZE; j++)
- str += sprintf(str, "%02X ", digest[j]);
- str += sprintf(str, "\n");
- }
- return str - buf;
-}
-EXPORT_SYMBOL_GPL(tpm_show_pcrs);
-
-#define READ_PUBEK_RESULT_SIZE 314
-#define TPM_ORD_READPUBEK cpu_to_be32(124)
-static 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);
-
- 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;
-
- /*
- ignore header 10 bytes
- algorithm 32 bits (1 == RSA )
- encscheme 16 bits
- sigscheme 16 bits
- parameters (RSA 12->bytes: keybit, #primes, expbit)
- keylenbytes 32 bits
- 256 byte modulus
- ignore checksum 20 bytes
- */
- data = tpm_cmd.params.readpubek_out_buffer;
- str +=
- sprintf(str,
- "Algorithm: %02X %02X %02X %02X\n"
- "Encscheme: %02X %02X\n"
- "Sigscheme: %02X %02X\n"
- "Parameters: %02X %02X %02X %02X "
- "%02X %02X %02X %02X "
- "%02X %02X %02X %02X\n"
- "Modulus length: %d\n"
- "Modulus:\n",
- data[0], data[1], data[2], data[3],
- data[4], data[5],
- data[6], data[7],
- data[12], data[13], data[14], data[15],
- data[16], data[17], data[18], data[19],
- data[20], data[21], data[22], data[23],
- be32_to_cpu(*((__be32 *) (data + 24))));
-
- for (i = 0; i < 256; i++) {
- str += sprintf(str, "%02X ", data[i + 28]);
- if ((i + 1) % 16 == 0)
- str += sprintf(str, "\n");
- }
-out:
- rc = str - buf;
- return rc;
-}
-EXPORT_SYMBOL_GPL(tpm_show_pubek);
-
-
-ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
- char *buf)
-{
- cap_t cap;
- ssize_t rc;
- char *str = buf;
-
- 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(cap.manufacturer_id));
-
- /* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */
- rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
- "attempting to determine the 1.2 version");
- if (!rc) {
- str += sprintf(str,
- "TCG version: %d.%d\nFirmware version: %d.%d\n",
- cap.tpm_version_1_2.Major,
- cap.tpm_version_1_2.Minor,
- cap.tpm_version_1_2.revMajor,
- cap.tpm_version_1_2.revMinor);
- } else {
- /* Otherwise just use TPM_STRUCT_VER */
- rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
- "attempting to determine the 1.1 version");
- if (rc)
- return 0;
- str += sprintf(str,
- "TCG version: %d.%d\nFirmware version: %d.%d\n",
- 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);
-
-ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
- char *buf)
-{
- struct tpm_chip *chip = dev_get_drvdata(dev);
-
- if (chip->vendor.duration[TPM_LONG] == 0)
- return 0;
-
- return sprintf(buf, "%d %d %d [%s]\n",
- jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
- jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
- jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
- chip->vendor.duration_adjusted
- ? "adjusted" : "original");
-}
-EXPORT_SYMBOL_GPL(tpm_show_durations);
-
-ssize_t tpm_show_timeouts(struct device *dev, struct device_attribute *attr,
- char *buf)
-{
- struct tpm_chip *chip = dev_get_drvdata(dev);
-
- return sprintf(buf, "%d %d %d %d [%s]\n",
- jiffies_to_usecs(chip->vendor.timeout_a),
- jiffies_to_usecs(chip->vendor.timeout_b),
- jiffies_to_usecs(chip->vendor.timeout_c),
- jiffies_to_usecs(chip->vendor.timeout_d),
- chip->vendor.timeout_adjusted
- ? "adjusted" : "original");
-}
-EXPORT_SYMBOL_GPL(tpm_show_timeouts);
-
-ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct tpm_chip *chip = dev_get_drvdata(dev);
- if (chip == NULL)
- return 0;
-
- chip->vendor.cancel(chip);
- return count;
-}
-EXPORT_SYMBOL_GPL(tpm_store_cancel);
-
-static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask,
- bool check_cancel, bool *canceled)
-{
- u8 status = chip->vendor.status(chip);
-
- *canceled = false;
- if ((status & mask) == mask)
- return true;
- if (check_cancel && chip->vendor.req_canceled(chip, status)) {
- *canceled = true;
- return true;
- }
- return false;
-}
-
-int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
- wait_queue_head_t *queue, bool check_cancel)
-{
- unsigned long stop;
- long rc;
- u8 status;
- bool canceled = false;
-
- /* 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,
- wait_for_tpm_stat_cond(chip, mask, check_cancel,
- &canceled),
- timeout);
- if (rc > 0) {
- if (canceled)
- return -ECANCELED;
- 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
- *
- * It's assured that the chip will be opened just once,
- * by the check of is_open variable, which is protected
- * by driver_lock.
- */
-int tpm_open(struct inode *inode, struct file *file)
-{
- struct miscdevice *misc = file->private_data;
- struct tpm_chip *chip = container_of(misc, struct tpm_chip,
- vendor.miscdev);
-
- if (test_and_set_bit(0, &chip->is_open)) {
- dev_dbg(chip->dev, "Another process owns this TPM\n");
- return -EBUSY;
- }
-
- chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
- if (chip->data_buffer == NULL) {
- clear_bit(0, &chip->is_open);
- return -ENOMEM;
- }
-
- atomic_set(&chip->data_pending, 0);
-
- file->private_data = chip;
- get_device(chip->dev);
- return 0;
-}
-EXPORT_SYMBOL_GPL(tpm_open);
-
-/*
- * Called on file close
- */
-int tpm_release(struct inode *inode, struct file *file)
-{
- struct tpm_chip *chip = file->private_data;
-
- del_singleshot_timer_sync(&chip->user_read_timer);
- flush_work(&chip->work);
- file->private_data = NULL;
- atomic_set(&chip->data_pending, 0);
- kzfree(chip->data_buffer);
- clear_bit(0, &chip->is_open);
- put_device(chip->dev);
- return 0;
-}
-EXPORT_SYMBOL_GPL(tpm_release);
-
-ssize_t tpm_write(struct file *file, const char __user *buf,
- size_t size, loff_t *off)
-{
- struct tpm_chip *chip = file->private_data;
- size_t in_size = size;
- ssize_t out_size;
-
- /* cannot perform a write until the read has cleared
- either via tpm_read or a user_read_timer timeout.
- This also prevents splitted buffered writes from blocking here.
- */
- if (atomic_read(&chip->data_pending) != 0)
- return -EBUSY;
-
- if (in_size > TPM_BUFSIZE)
- return -E2BIG;
-
- mutex_lock(&chip->buffer_mutex);
-
- if (copy_from_user
- (chip->data_buffer, (void __user *) buf, in_size)) {
- mutex_unlock(&chip->buffer_mutex);
- return -EFAULT;
- }
-
- /* atomic tpm command send and result receive */
- out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
- if (out_size < 0) {
- mutex_unlock(&chip->buffer_mutex);
- return out_size;
- }
-
- atomic_set(&chip->data_pending, out_size);
- mutex_unlock(&chip->buffer_mutex);
-
- /* Set a timeout by which the reader must come claim the result */
- mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
-
- return in_size;
-}
-EXPORT_SYMBOL_GPL(tpm_write);
-
-ssize_t tpm_read(struct file *file, char __user *buf,
- size_t size, loff_t *off)
-{
- struct tpm_chip *chip = file->private_data;
- ssize_t ret_size;
- int rc;
-
- del_singleshot_timer_sync(&chip->user_read_timer);
- flush_work(&chip->work);
- ret_size = atomic_read(&chip->data_pending);
- if (ret_size > 0) { /* relay data */
- ssize_t orig_ret_size = ret_size;
- if (size < ret_size)
- ret_size = size;
-
- mutex_lock(&chip->buffer_mutex);
- rc = copy_to_user(buf, chip->data_buffer, ret_size);
- memset(chip->data_buffer, 0, orig_ret_size);
- if (rc)
- ret_size = -EFAULT;
-
- mutex_unlock(&chip->buffer_mutex);
- }
-
- atomic_set(&chip->data_pending, 0);
-
- return ret_size;
-}
-EXPORT_SYMBOL_GPL(tpm_read);
-
-void tpm_remove_hardware(struct device *dev)
-{
- struct tpm_chip *chip = dev_get_drvdata(dev);
-
- if (chip == NULL) {
- dev_err(dev, "No device data found\n");
- return;
- }
-
- spin_lock(&driver_lock);
- list_del_rcu(&chip->list);
- spin_unlock(&driver_lock);
- synchronize_rcu();
-
- misc_deregister(&chip->vendor.miscdev);
- sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
- tpm_remove_ppi(&dev->kobj);
- tpm_bios_log_teardown(chip->bios_dir);
-
- /* write it this way to be explicit (chip->dev == dev) */
- put_device(chip->dev);
-}
-EXPORT_SYMBOL_GPL(tpm_remove_hardware);
-
-#define TPM_ORD_SAVESTATE cpu_to_be32(152)
-#define SAVESTATE_RESULT_SIZE 10
-
-static struct tpm_input_header savestate_header = {
- .tag = TPM_TAG_RQU_COMMAND,
- .length = cpu_to_be32(10),
- .ordinal = TPM_ORD_SAVESTATE
-};
-
-/*
- * We are about to suspend. Save the TPM state
- * so that it can be restored.
- */
-int tpm_pm_suspend(struct device *dev)
-{
- struct tpm_chip *chip = dev_get_drvdata(dev);
- struct tpm_cmd_t cmd;
- int rc, try;
-
- u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
-
- if (chip == NULL)
- return -ENODEV;
-
- /* for buggy tpm, flush pcrs with extend to selected dummy */
- if (tpm_suspend_pcr) {
- cmd.header.in = pcrextend_header;
- cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
- memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
- TPM_DIGEST_SIZE);
- rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
- "extending dummy pcr before suspend");
- }
-
- /* now do the actual savestate */
- for (try = 0; try < TPM_RETRY; try++) {
- cmd.header.in = savestate_header;
- rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE, NULL);
-
- /*
- * If the TPM indicates that it is too busy to respond to
- * this command then retry before giving up. It can take
- * several seconds for this TPM to be ready.
- *
- * This can happen if the TPM has already been sent the
- * SaveState command before the driver has loaded. TCG 1.2
- * specification states that any communication after SaveState
- * may cause the TPM to invalidate previously saved state.
- */
- if (rc != TPM_WARN_RETRY)
- break;
- msleep(TPM_TIMEOUT_RETRY);
- }
-
- if (rc)
- dev_err(chip->dev,
- "Error (%d) sending savestate before suspend\n", rc);
- else if (try > 0)
- dev_warn(chip->dev, "TPM savestate took %dms\n",
- try * TPM_TIMEOUT_RETRY);
-
- return rc;
-}
-EXPORT_SYMBOL_GPL(tpm_pm_suspend);
-
-/*
- * Resume from a power safe. The BIOS already restored
- * the TPM state.
- */
-int tpm_pm_resume(struct device *dev)
-{
- struct tpm_chip *chip = dev_get_drvdata(dev);
-
- if (chip == NULL)
- return -ENODEV;
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(tpm_pm_resume);
-
-#define TPM_GETRANDOM_RESULT_SIZE 18
-static struct tpm_input_header tpm_getrandom_header = {
- .tag = TPM_TAG_RQU_COMMAND,
- .length = cpu_to_be32(14),
- .ordinal = TPM_ORD_GET_RANDOM
-};
-
-/**
- * tpm_get_random() - Get random bytes from the tpm's RNG
- * @chip_num: A specific chip number for the request or TPM_ANY_NUM
- * @out: destination buffer for the random bytes
- * @max: the max number of bytes to write to @out
- *
- * Returns < 0 on error and the number of bytes read on success
- */
-int tpm_get_random(u32 chip_num, u8 *out, size_t max)
-{
- struct tpm_chip *chip;
- struct tpm_cmd_t tpm_cmd;
- u32 recd, num_bytes = min_t(u32, max, TPM_MAX_RNG_DATA);
- int err, total = 0, retries = 5;
- u8 *dest = out;
-
- chip = tpm_chip_find_get(chip_num);
- if (chip == NULL)
- return -ENODEV;
-
- if (!out || !num_bytes || max > TPM_MAX_RNG_DATA)
- return -EINVAL;
-
- do {
- tpm_cmd.header.in = tpm_getrandom_header;
- tpm_cmd.params.getrandom_in.num_bytes = cpu_to_be32(num_bytes);
-
- err = transmit_cmd(chip, &tpm_cmd,
- TPM_GETRANDOM_RESULT_SIZE + num_bytes,
- "attempting get random");
- if (err)
- break;
-
- recd = be32_to_cpu(tpm_cmd.params.getrandom_out.rng_data_len);
- memcpy(dest, tpm_cmd.params.getrandom_out.rng_data, recd);
-
- dest += recd;
- total += recd;
- num_bytes -= recd;
- } while (retries-- && total < max);
-
- return total ? total : -EIO;
-}
-EXPORT_SYMBOL_GPL(tpm_get_random);
-
-/* In case vendor provided release function, call it too.*/
-
-void tpm_dev_vendor_release(struct tpm_chip *chip)
-{
- if (!chip)
- return;
-
- if (chip->vendor.release)
- chip->vendor.release(chip->dev);
-
- clear_bit(chip->dev_num, dev_mask);
-}
-EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
-
-
-/*
- * Once all references to platform device are down to 0,
- * release all allocated structures.
- */
-void tpm_dev_release(struct device *dev)
-{
- struct tpm_chip *chip = dev_get_drvdata(dev);
-
- if (!chip)
- return;
-
- tpm_dev_vendor_release(chip);
-
- chip->release(dev);
- kfree(chip);
-}
-EXPORT_SYMBOL_GPL(tpm_dev_release);
-
-/*
- * Called from tpm_<specific>.c probe function only for devices
- * the driver has determined it should claim. Prior to calling
- * this function the specific probe function has called pci_enable_device
- * upon errant exit from this function specific probe function should call
- * pci_disable_device
- */
-struct tpm_chip *tpm_register_hardware(struct device *dev,
- const struct tpm_vendor_specific *entry)
-{
- struct tpm_chip *chip;
-
- /* Driver specific per-device data */
- chip = kzalloc(sizeof(*chip), GFP_KERNEL);
-
- if (chip == NULL)
- return NULL;
-
- mutex_init(&chip->buffer_mutex);
- mutex_init(&chip->tpm_mutex);
- INIT_LIST_HEAD(&chip->list);
-
- INIT_WORK(&chip->work, timeout_work);
-
- setup_timer(&chip->user_read_timer, user_reader_timeout,
- (unsigned long)chip);
-
- memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
-
- chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
-
- if (chip->dev_num >= TPM_NUM_DEVICES) {
- dev_err(dev, "No available tpm device numbers\n");
- goto out_free;
- } else if (chip->dev_num == 0)
- chip->vendor.miscdev.minor = TPM_MINOR;
- else
- chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
-
- set_bit(chip->dev_num, dev_mask);
-
- scnprintf(chip->devname, sizeof(chip->devname), "%s%d", "tpm",
- chip->dev_num);
- chip->vendor.miscdev.name = chip->devname;
-
- chip->vendor.miscdev.parent = dev;
- chip->dev = get_device(dev);
- chip->release = dev->release;
- dev->release = tpm_dev_release;
- dev_set_drvdata(dev, chip);
-
- if (misc_register(&chip->vendor.miscdev)) {
- dev_err(chip->dev,
- "unable to misc_register %s, minor %d\n",
- chip->vendor.miscdev.name,
- chip->vendor.miscdev.minor);
- goto put_device;
- }
-
- if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
- misc_deregister(&chip->vendor.miscdev);
- goto put_device;
- }
-
- if (tpm_add_ppi(&dev->kobj)) {
- misc_deregister(&chip->vendor.miscdev);
- goto put_device;
- }
-
- chip->bios_dir = tpm_bios_log_setup(chip->devname);
-
- /* Make chip available */
- spin_lock(&driver_lock);
- list_add_rcu(&chip->list, &tpm_chip_list);
- spin_unlock(&driver_lock);
-
- return chip;
-
-put_device:
- put_device(chip->dev);
-out_free:
- kfree(chip);
- return NULL;
-}
-EXPORT_SYMBOL_GPL(tpm_register_hardware);
-
-MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
-MODULE_DESCRIPTION("TPM Driver");
-MODULE_VERSION("2.0");
-MODULE_LICENSE("GPL");
git.samba.org / sfrench / cifs-2.6.git / blobdiff