From b7d7b28471072fc23e7b573aef89c14438092223 Mon Sep 17 00:00:00 2001
From: Jarkko Sakkinen
Date: Fri, 2 Sep 2016 02:36:58 +0300
Subject: tpm: invalid self test error message

The driver emits invalid self test error message even though the init
succeeds.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Fixes: cae8b441fc20 ("tpm: Factor out common startup code")
Reviewed-by: James Morris <james.l.morris@oracle.com>
---
 drivers/char/tpm/tpm2-cmd.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index 08c7e23ed535..0c75c3f1689f 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -957,7 +957,7 @@ int tpm2_auto_startup(struct tpm_chip *chip)
 		goto out;
 
 	rc = tpm2_do_selftest(chip);
-	if (rc != TPM2_RC_INITIALIZE) {
+	if (rc != 0 && rc != TPM2_RC_INITIALIZE) {
 		dev_err(&chip->dev, "TPM self test failed\n");
 		goto out;
 	}
@@ -974,7 +974,6 @@ int tpm2_auto_startup(struct tpm_chip *chip)
 		}
 	}
 
-	return rc;
 out:
 	if (rc > 0)
 		rc = -ENODEV;
-- 
cgit v1.2.3


From d4816edfe706497a8525480c1685ceb9871bc118 Mon Sep 17 00:00:00 2001
From: Jarkko Sakkinen
Date: Tue, 16 Aug 2016 22:00:38 +0300
Subject: tpm: fix a race condition in tpm2_unseal_trusted()

Unseal and load operations should be done as an atomic operation. This
commit introduces unlocked tpm_transmit() so that tpm2_unseal_trusted()
can do the locking by itself.

Fixes: 0fe5480303a1 ("keys, trusted: seal/unseal with TPM 2.0 chips")
Cc: stable@vger.kernel.org
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
---
 drivers/char/tpm/tpm-dev.c       |   2 +-
 drivers/char/tpm/tpm-interface.c |  51 +++++++++++---------
 drivers/char/tpm/tpm-sysfs.c     |   2 +-
 drivers/char/tpm/tpm.h           |  12 +++--
 drivers/char/tpm/tpm2-cmd.c      | 101 +++++++++++++++++++++++++--------------
 5 files changed, 103 insertions(+), 65 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm-dev.c b/drivers/char/tpm/tpm-dev.c
index f5d452151c6b..912ad30be585 100644
--- a/drivers/char/tpm/tpm-dev.c
+++ b/drivers/char/tpm/tpm-dev.c
@@ -145,7 +145,7 @@ static ssize_t tpm_write(struct file *file, const char __user *buf,
 		return -EPIPE;
 	}
 	out_size = tpm_transmit(priv->chip, priv->data_buffer,
-				sizeof(priv->data_buffer));
+				sizeof(priv->data_buffer), 0);
 
 	tpm_put_ops(priv->chip);
 	if (out_size < 0) {
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 1abe2d7a2610..aef20ee2331a 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -330,8 +330,8 @@ EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
 /*
  * Internal kernel interface to transmit TPM commands
  */
-ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
-		     size_t bufsiz)
+ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz,
+		     unsigned int flags)
 {
 	ssize_t rc;
 	u32 count, ordinal;
@@ -350,7 +350,8 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
 		return -E2BIG;
 	}
 
-	mutex_lock(&chip->tpm_mutex);
+	if (!(flags & TPM_TRANSMIT_UNLOCKED))
+		mutex_lock(&chip->tpm_mutex);
 
 	rc = chip->ops->send(chip, (u8 *) buf, count);
 	if (rc < 0) {
@@ -393,20 +394,21 @@ out_recv:
 		dev_err(&chip->dev,
 			"tpm_transmit: tpm_recv: error %zd\n", rc);
 out:
-	mutex_unlock(&chip->tpm_mutex);
+	if (!(flags & TPM_TRANSMIT_UNLOCKED))
+		mutex_unlock(&chip->tpm_mutex);
 	return rc;
 }
 
 #define TPM_DIGEST_SIZE 20
 #define TPM_RET_CODE_IDX 6
 
-ssize_t tpm_transmit_cmd(struct tpm_chip *chip, void *cmd,
-			 int len, const char *desc)
+ssize_t tpm_transmit_cmd(struct tpm_chip *chip, const void *cmd,
+			 int len, unsigned int flags, const char *desc)
 {
-	struct tpm_output_header *header;
+	const struct tpm_output_header *header;
 	int err;
 
-	len = tpm_transmit(chip, (u8 *) cmd, len);
+	len = tpm_transmit(chip, (const u8 *)cmd, len, flags);
 	if (len <  0)
 		return len;
 	else if (len < TPM_HEADER_SIZE)
@@ -453,7 +455,8 @@ ssize_t tpm_getcap(struct tpm_chip *chip, __be32 subcap_id, cap_t *cap,
 		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 		tpm_cmd.params.getcap_in.subcap = subcap_id;
 	}
-	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
+	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, 0,
+			      desc);
 	if (!rc)
 		*cap = tpm_cmd.params.getcap_out.cap;
 	return rc;
@@ -469,7 +472,7 @@ void tpm_gen_interrupt(struct tpm_chip *chip)
 	tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 	tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
 
-	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
+	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, 0,
 			      "attempting to determine the timeouts");
 }
 EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
@@ -490,7 +493,7 @@ static int tpm_startup(struct tpm_chip *chip, __be16 startup_type)
 	start_cmd.header.in = tpm_startup_header;
 
 	start_cmd.params.startup_in.startup_type = startup_type;
-	return tpm_transmit_cmd(chip, &start_cmd, TPM_INTERNAL_RESULT_SIZE,
+	return tpm_transmit_cmd(chip, &start_cmd, TPM_INTERNAL_RESULT_SIZE, 0,
 				"attempting to start the TPM");
 }
 
@@ -521,7 +524,8 @@ int tpm_get_timeouts(struct tpm_chip *chip)
 	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 = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, NULL);
+	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, 0,
+			      NULL);
 
 	if (rc == TPM_ERR_INVALID_POSTINIT) {
 		/* The TPM is not started, we are the first to talk to it.
@@ -535,7 +539,7 @@ int tpm_get_timeouts(struct tpm_chip *chip)
 		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 		tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
 		rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
-				  NULL);
+				      0, NULL);
 	}
 	if (rc) {
 		dev_err(&chip->dev,
@@ -596,7 +600,7 @@ duration:
 	tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 	tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
 
-	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
+	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, 0,
 			      "attempting to determine the durations");
 	if (rc)
 		return rc;
@@ -652,7 +656,7 @@ static int tpm_continue_selftest(struct tpm_chip *chip)
 	struct tpm_cmd_t cmd;
 
 	cmd.header.in = continue_selftest_header;
-	rc = tpm_transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
+	rc = tpm_transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE, 0,
 			      "continue selftest");
 	return rc;
 }
@@ -672,7 +676,7 @@ int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
 
 	cmd.header.in = pcrread_header;
 	cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
-	rc = tpm_transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
+	rc = tpm_transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE, 0,
 			      "attempting to read a pcr value");
 
 	if (rc == 0)
@@ -770,7 +774,7 @@ int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
 	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 = tpm_transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
+	rc = tpm_transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE, 0,
 			      "attempting extend a PCR value");
 
 	tpm_put_ops(chip);
@@ -809,7 +813,7 @@ int tpm_do_selftest(struct tpm_chip *chip)
 		/* 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);
+		rc = tpm_transmit(chip, (u8 *) &cmd, READ_PCR_RESULT_SIZE, 0);
 		/* 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. */
@@ -879,7 +883,7 @@ int tpm_send(u32 chip_num, void *cmd, size_t buflen)
 	if (chip == NULL)
 		return -ENODEV;
 
-	rc = tpm_transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
+	rc = tpm_transmit_cmd(chip, cmd, buflen, 0, "attempting tpm_cmd");
 
 	tpm_put_ops(chip);
 	return rc;
@@ -981,14 +985,15 @@ int tpm_pm_suspend(struct device *dev)
 		cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
 		memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
 		       TPM_DIGEST_SIZE);
-		rc = tpm_transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
+		rc = tpm_transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE, 0,
 				      "extending dummy pcr before suspend");
 	}
 
 	/* now do the actual savestate */
 	for (try = 0; try < TPM_RETRY; try++) {
 		cmd.header.in = savestate_header;
-		rc = tpm_transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE, NULL);
+		rc = tpm_transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE, 0,
+				      NULL);
 
 		/*
 		 * If the TPM indicates that it is too busy to respond to
@@ -1072,8 +1077,8 @@ int tpm_get_random(u32 chip_num, u8 *out, size_t max)
 		tpm_cmd.params.getrandom_in.num_bytes = cpu_to_be32(num_bytes);
 
 		err = tpm_transmit_cmd(chip, &tpm_cmd,
-				   TPM_GETRANDOM_RESULT_SIZE + num_bytes,
-				   "attempting get random");
+				       TPM_GETRANDOM_RESULT_SIZE + num_bytes,
+				       0, "attempting get random");
 		if (err)
 			break;
 
diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
index b46cf70c8b16..e1f7236c115c 100644
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -39,7 +39,7 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
 	struct tpm_chip *chip = to_tpm_chip(dev);
 
 	tpm_cmd.header.in = tpm_readpubek_header;
-	err = tpm_transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
+	err = tpm_transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE, 0,
 			       "attempting to read the PUBEK");
 	if (err)
 		goto out;
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 3e32d5bd2dc6..b0585e99da49 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -476,12 +476,16 @@ extern dev_t tpm_devt;
 extern const struct file_operations tpm_fops;
 extern struct idr dev_nums_idr;
 
+enum tpm_transmit_flags {
+	TPM_TRANSMIT_UNLOCKED	= BIT(0),
+};
+
+ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz,
+		     unsigned int flags);
+ssize_t tpm_transmit_cmd(struct tpm_chip *chip, const void *cmd, int len,
+			 unsigned int flags, const char *desc);
 ssize_t tpm_getcap(struct tpm_chip *chip, __be32 subcap_id, cap_t *cap,
 		   const char *desc);
-ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
-		     size_t bufsiz);
-ssize_t tpm_transmit_cmd(struct tpm_chip *chip, void *cmd, int len,
-			 const char *desc);
 extern int tpm_get_timeouts(struct tpm_chip *);
 extern void tpm_gen_interrupt(struct tpm_chip *);
 int tpm1_auto_startup(struct tpm_chip *chip);
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index 0c75c3f1689f..ef5a58b986f6 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -282,7 +282,7 @@ int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
 	       sizeof(cmd.params.pcrread_in.pcr_select));
 	cmd.params.pcrread_in.pcr_select[pcr_idx >> 3] = 1 << (pcr_idx & 0x7);
 
-	rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
+	rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0,
 			      "attempting to read a pcr value");
 	if (rc == 0) {
 		buf = cmd.params.pcrread_out.digest;
@@ -330,7 +330,7 @@ int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash)
 	cmd.params.pcrextend_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
 	memcpy(cmd.params.pcrextend_in.digest, hash, TPM_DIGEST_SIZE);
 
-	rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
+	rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0,
 			      "attempting extend a PCR value");
 
 	return rc;
@@ -376,7 +376,7 @@ int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max)
 		cmd.header.in = tpm2_getrandom_header;
 		cmd.params.getrandom_in.size = cpu_to_be16(num_bytes);
 
-		err = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
+		err = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0,
 				       "attempting get random");
 		if (err)
 			break;
@@ -434,12 +434,12 @@ static void tpm2_buf_append_auth(struct tpm_buf *buf, u32 session_handle,
 }
 
 /**
- * tpm2_seal_trusted() - seal a trusted key
- * @chip_num: A specific chip number for the request or TPM_ANY_NUM
- * @options: authentication values and other options
+ * tpm2_seal_trusted() - seal the payload of a trusted key
+ * @chip_num: TPM chip to use
  * @payload: the key data in clear and encrypted form
+ * @options: authentication values and other options
  *
- * Returns < 0 on error and 0 on success.
+ * Return: < 0 on error and 0 on success.
  */
 int tpm2_seal_trusted(struct tpm_chip *chip,
 		      struct trusted_key_payload *payload,
@@ -512,7 +512,7 @@ int tpm2_seal_trusted(struct tpm_chip *chip,
 		goto out;
 	}
 
-	rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, "sealing data");
+	rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, 0, "sealing data");
 	if (rc)
 		goto out;
 
@@ -538,10 +538,18 @@ out:
 	return rc;
 }
 
-static int tpm2_load(struct tpm_chip *chip,
-		     struct trusted_key_payload *payload,
-		     struct trusted_key_options *options,
-		     u32 *blob_handle)
+/**
+ * tpm2_load_cmd() - execute a TPM2_Load command
+ * @chip_num: TPM chip to use
+ * @payload: the key data in clear and encrypted form
+ * @options: authentication values and other options
+ *
+ * Return: same as with tpm_transmit_cmd
+ */
+static int tpm2_load_cmd(struct tpm_chip *chip,
+			 struct trusted_key_payload *payload,
+			 struct trusted_key_options *options,
+			 u32 *blob_handle, unsigned int flags)
 {
 	struct tpm_buf buf;
 	unsigned int private_len;
@@ -576,7 +584,7 @@ static int tpm2_load(struct tpm_chip *chip,
 		goto out;
 	}
 
-	rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, "loading blob");
+	rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, flags, "loading blob");
 	if (!rc)
 		*blob_handle = be32_to_cpup(
 			(__be32 *) &buf.data[TPM_HEADER_SIZE]);
@@ -590,7 +598,16 @@ out:
 	return rc;
 }
 
-static void tpm2_flush_context(struct tpm_chip *chip, u32 handle)
+/**
+ * tpm2_flush_context_cmd() - execute a TPM2_FlushContext command
+ * @chip_num: TPM chip to use
+ * @payload: the key data in clear and encrypted form
+ * @options: authentication values and other options
+ *
+ * Return: same as with tpm_transmit_cmd
+ */
+static void tpm2_flush_context_cmd(struct tpm_chip *chip, u32 handle,
+				   unsigned int flags)
 {
 	struct tpm_buf buf;
 	int rc;
@@ -604,7 +621,8 @@ static void tpm2_flush_context(struct tpm_chip *chip, u32 handle)
 
 	tpm_buf_append_u32(&buf, handle);
 
-	rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, "flushing context");
+	rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, flags,
+			      "flushing context");
 	if (rc)
 		dev_warn(&chip->dev, "0x%08x was not flushed, rc=%d\n", handle,
 			 rc);
@@ -612,10 +630,18 @@ static void tpm2_flush_context(struct tpm_chip *chip, u32 handle)
 	tpm_buf_destroy(&buf);
 }
 
-static int tpm2_unseal(struct tpm_chip *chip,
-		       struct trusted_key_payload *payload,
-		       struct trusted_key_options *options,
-		       u32 blob_handle)
+/**
+ * tpm2_unseal_cmd() - execute a TPM2_Unload command
+ * @chip_num: TPM chip to use
+ * @payload: the key data in clear and encrypted form
+ * @options: authentication values and other options
+ *
+ * Return: same as with tpm_transmit_cmd
+ */
+static int tpm2_unseal_cmd(struct tpm_chip *chip,
+			   struct trusted_key_payload *payload,
+			   struct trusted_key_options *options,
+			   u32 blob_handle, unsigned int flags)
 {
 	struct tpm_buf buf;
 	u16 data_len;
@@ -635,7 +661,7 @@ static int tpm2_unseal(struct tpm_chip *chip,
 			     options->blobauth /* hmac */,
 			     TPM_DIGEST_SIZE);
 
-	rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, "unsealing");
+	rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, flags, "unsealing");
 	if (rc > 0)
 		rc = -EPERM;
 
@@ -654,12 +680,12 @@ static int tpm2_unseal(struct tpm_chip *chip,
 }
 
 /**
- * tpm_unseal_trusted() - unseal a trusted key
- * @chip_num: A specific chip number for the request or TPM_ANY_NUM
- * @options: authentication values and other options
+ * tpm_unseal_trusted() - unseal the payload of a trusted key
+ * @chip_num: TPM chip to use
  * @payload: the key data in clear and encrypted form
+ * @options: authentication values and other options
  *
- * Returns < 0 on error and 0 on success.
+ * Return: < 0 on error and 0 on success.
  */
 int tpm2_unseal_trusted(struct tpm_chip *chip,
 			struct trusted_key_payload *payload,
@@ -668,14 +694,17 @@ int tpm2_unseal_trusted(struct tpm_chip *chip,
 	u32 blob_handle;
 	int rc;
 
-	rc = tpm2_load(chip, payload, options, &blob_handle);
+	mutex_lock(&chip->tpm_mutex);
+	rc = tpm2_load_cmd(chip, payload, options, &blob_handle,
+			   TPM_TRANSMIT_UNLOCKED);
 	if (rc)
-		return rc;
-
-	rc = tpm2_unseal(chip, payload, options, blob_handle);
-
-	tpm2_flush_context(chip, blob_handle);
+		goto out;
 
+	rc = tpm2_unseal_cmd(chip, payload, options, blob_handle,
+			     TPM_TRANSMIT_UNLOCKED);
+	tpm2_flush_context_cmd(chip, blob_handle, TPM_TRANSMIT_UNLOCKED);
+out:
+	mutex_unlock(&chip->tpm_mutex);
 	return rc;
 }
 
@@ -701,7 +730,7 @@ ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,  u32 *value,
 	cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(property_id);
 	cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1);
 
-	rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), desc);
+	rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, desc);
 	if (!rc)
 		*value = be32_to_cpu(cmd.params.get_tpm_pt_out.value);
 
@@ -735,7 +764,7 @@ static int tpm2_startup(struct tpm_chip *chip, u16 startup_type)
 	cmd.header.in = tpm2_startup_header;
 
 	cmd.params.startup_in.startup_type = cpu_to_be16(startup_type);
-	return tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
+	return tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0,
 				"attempting to start the TPM");
 }
 
@@ -763,7 +792,7 @@ void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type)
 	cmd.header.in = tpm2_shutdown_header;
 	cmd.params.startup_in.startup_type = cpu_to_be16(shutdown_type);
 
-	rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), "stopping the TPM");
+	rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, "stopping the TPM");
 
 	/* In places where shutdown command is sent there's no much we can do
 	 * except print the error code on a system failure.
@@ -828,7 +857,7 @@ static int tpm2_start_selftest(struct tpm_chip *chip, bool full)
 	cmd.header.in = tpm2_selftest_header;
 	cmd.params.selftest_in.full_test = full;
 
-	rc = tpm_transmit_cmd(chip, &cmd, TPM2_SELF_TEST_IN_SIZE,
+	rc = tpm_transmit_cmd(chip, &cmd, TPM2_SELF_TEST_IN_SIZE, 0,
 			      "continue selftest");
 
 	/* At least some prototype chips seem to give RC_TESTING error
@@ -880,7 +909,7 @@ static int tpm2_do_selftest(struct tpm_chip *chip)
 		cmd.params.pcrread_in.pcr_select[1] = 0x00;
 		cmd.params.pcrread_in.pcr_select[2] = 0x00;
 
-		rc = tpm_transmit_cmd(chip, (u8 *) &cmd, sizeof(cmd), NULL);
+		rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, NULL);
 		if (rc < 0)
 			break;
 
@@ -928,7 +957,7 @@ int tpm2_probe(struct tpm_chip *chip)
 	cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(0x100);
 	cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1);
 
-	rc = tpm_transmit(chip, (const char *) &cmd, sizeof(cmd));
+	rc = tpm_transmit(chip, (const u8 *)&cmd, sizeof(cmd), 0);
 	if (rc <  0)
 		return rc;
 	else if (rc < TPM_HEADER_SIZE)
-- 
cgit v1.2.3


From 09dd7703753f6fdd68b184de65b720b040dd1721 Mon Sep 17 00:00:00 2001
From: Jason Gunthorpe
Date: Tue, 19 Jul 2016 14:38:55 -0600
Subject: tpm/st33zp24: Remove useless tpm_gen_interrupt

This function should only be called as part of an IRQ probing protocol
and st33 does not have any code to detect that the IRQ it tries to
generate was not generated and disable the IRQ.

Since st33 is primarily a DT binding driver it should not be doing
IRQ probing anyhow, so let us just delete this useless call.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/char/tpm/st33zp24/st33zp24.c | 2 --
 1 file changed, 2 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/st33zp24/st33zp24.c b/drivers/char/tpm/st33zp24/st33zp24.c
index c2ee30451e41..6f060c76217b 100644
--- a/drivers/char/tpm/st33zp24/st33zp24.c
+++ b/drivers/char/tpm/st33zp24/st33zp24.c
@@ -589,8 +589,6 @@ int st33zp24_probe(void *phy_id, const struct st33zp24_phy_ops *ops,
 		chip->flags |= TPM_CHIP_FLAG_IRQ;
 
 		disable_irq_nosync(tpm_dev->irq);
-
-		tpm_gen_interrupt(chip);
 	}
 
 	return tpm_chip_register(chip);
-- 
cgit v1.2.3


From d4abd9565dd6da1ab2a402af77617d32949ed06c Mon Sep 17 00:00:00 2001
From: Jarkko Sakkinen
Date: Sat, 25 Jun 2016 23:33:09 +0300
Subject: tpm: remove unnecessary externs from tpm.h

Removed unnecessary externs from tpm.h.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
---
 drivers/char/tpm/tpm.h | 36 ++++++++++++++++++------------------
 1 file changed, 18 insertions(+), 18 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index b0585e99da49..e92f4b1a449c 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -486,26 +486,26 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, const void *cmd, int len,
 			 unsigned int flags, const char *desc);
 ssize_t tpm_getcap(struct tpm_chip *chip, __be32 subcap_id, cap_t *cap,
 		   const char *desc);
-extern int tpm_get_timeouts(struct tpm_chip *);
-extern void tpm_gen_interrupt(struct tpm_chip *);
+int tpm_get_timeouts(struct tpm_chip *);
+void tpm_gen_interrupt(struct tpm_chip *);
 int tpm1_auto_startup(struct tpm_chip *chip);
-extern int tpm_do_selftest(struct tpm_chip *);
-extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
-extern int tpm_pm_suspend(struct device *);
-extern int tpm_pm_resume(struct device *);
-extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
-			     wait_queue_head_t *, bool);
+int tpm_do_selftest(struct tpm_chip *chip);
+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);
+int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
+		      wait_queue_head_t *queue, bool check_cancel);
 
 struct tpm_chip *tpm_chip_find_get(int chip_num);
 __must_check int tpm_try_get_ops(struct tpm_chip *chip);
 void tpm_put_ops(struct tpm_chip *chip);
 
-extern struct tpm_chip *tpm_chip_alloc(struct device *dev,
-				       const struct tpm_class_ops *ops);
-extern struct tpm_chip *tpmm_chip_alloc(struct device *pdev,
-				       const struct tpm_class_ops *ops);
-extern int tpm_chip_register(struct tpm_chip *chip);
-extern void tpm_chip_unregister(struct tpm_chip *chip);
+struct tpm_chip *tpm_chip_alloc(struct device *dev,
+				const struct tpm_class_ops *ops);
+struct tpm_chip *tpmm_chip_alloc(struct device *pdev,
+				 const struct tpm_class_ops *ops);
+int tpm_chip_register(struct tpm_chip *chip);
+void tpm_chip_unregister(struct tpm_chip *chip);
 
 void tpm_sysfs_add_device(struct tpm_chip *chip);
 
@@ -532,8 +532,8 @@ ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,
 			u32 *value, const char *desc);
 
 int tpm2_auto_startup(struct tpm_chip *chip);
-extern void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
-extern unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *, u32);
-extern int tpm2_gen_interrupt(struct tpm_chip *chip);
-extern int tpm2_probe(struct tpm_chip *chip);
+void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
+unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
+int tpm2_gen_interrupt(struct tpm_chip *chip);
+int tpm2_probe(struct tpm_chip *chip);
 #endif
-- 
cgit v1.2.3


From eb5854e764b91a71106f159a4ac264ffed1eebf2 Mon Sep 17 00:00:00 2001
From: Jarkko Sakkinen
Date: Sun, 12 Jun 2016 16:42:09 +0300
Subject: tpm: replace tpm_gen_interrupt() with tpm_tis_gen_interrupt()

Since tpm_gen_interrupt() is only used in tpm_tis_core.c this commit
replaces it with an internal tpm_tis_gen_interrupt(). The semantics
also changed in a way that on a system error the driver initialization
is failed.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
---
 drivers/char/tpm/tpm-interface.c | 16 +---------------
 drivers/char/tpm/tpm.h           |  2 --
 drivers/char/tpm/tpm2-cmd.c      | 18 +-----------------
 drivers/char/tpm/tpm_tis_core.c  | 19 +++++++++++++++----
 4 files changed, 17 insertions(+), 38 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index aef20ee2331a..6bffb13fb189 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -461,21 +461,7 @@ ssize_t tpm_getcap(struct tpm_chip *chip, __be32 subcap_id, cap_t *cap,
 		*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 = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, 0,
-			      "attempting to determine the timeouts");
-}
-EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
+EXPORT_SYMBOL_GPL(tpm_getcap);
 
 #define TPM_ORD_STARTUP cpu_to_be32(153)
 #define TPM_ST_CLEAR cpu_to_be16(1)
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index e92f4b1a449c..4d183c97f6a6 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -487,7 +487,6 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, const void *cmd, int len,
 ssize_t tpm_getcap(struct tpm_chip *chip, __be32 subcap_id, cap_t *cap,
 		   const char *desc);
 int tpm_get_timeouts(struct tpm_chip *);
-void tpm_gen_interrupt(struct tpm_chip *);
 int tpm1_auto_startup(struct tpm_chip *chip);
 int tpm_do_selftest(struct tpm_chip *chip);
 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
@@ -534,6 +533,5 @@ ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,
 int tpm2_auto_startup(struct tpm_chip *chip);
 void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
 unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
-int tpm2_gen_interrupt(struct tpm_chip *chip);
 int tpm2_probe(struct tpm_chip *chip);
 #endif
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index ef5a58b986f6..a5aa8de23c3d 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -736,6 +736,7 @@ ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,  u32 *value,
 
 	return rc;
 }
+EXPORT_SYMBOL_GPL(tpm2_get_tpm_pt);
 
 #define TPM2_STARTUP_IN_SIZE \
 	(sizeof(struct tpm_input_header) + \
@@ -923,23 +924,6 @@ static int tpm2_do_selftest(struct tpm_chip *chip)
 	return rc;
 }
 
-/**
- * tpm2_gen_interrupt() - generate an interrupt
- * @chip: TPM chip to use
- *
- * 0 is returned when the operation is successful. If a negative number is
- * returned it remarks a POSIX error code. If a positive number is returned
- * it remarks a TPM error.
- */
-int tpm2_gen_interrupt(struct tpm_chip *chip)
-{
-	u32 dummy;
-
-	return tpm2_get_tpm_pt(chip, 0x100, &dummy,
-			       "attempting to generate an interrupt");
-}
-EXPORT_SYMBOL_GPL(tpm2_gen_interrupt);
-
 /**
  * tpm2_probe() - probe TPM 2.0
  * @chip: TPM chip to use
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index d66f51b3648e..f22caf802e56 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -526,6 +526,18 @@ static irqreturn_t tis_int_handler(int dummy, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+static int tpm_tis_gen_interrupt(struct tpm_chip *chip)
+{
+	const char *desc = "attempting to generate an interrupt";
+	u32 cap2;
+	cap_t cap;
+
+	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);
+}
+
 /* Register the IRQ and issue a command that will cause an interrupt. If an
  * irq is seen then leave the chip setup for IRQ operation, otherwise reverse
  * everything and leave in polling mode. Returns 0 on success.
@@ -575,10 +587,9 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask,
 	/* Generate an interrupt by having the core call through to
 	 * tpm_tis_send
 	 */
-	if (chip->flags & TPM_CHIP_FLAG_TPM2)
-		tpm2_gen_interrupt(chip);
-	else
-		tpm_gen_interrupt(chip);
+	rc = tpm_tis_gen_interrupt(chip);
+	if (rc < 0)
+		return rc;
 
 	/* tpm_tis_send will either confirm the interrupt is working or it
 	 * will call disable_irq which undoes all of the above.
-- 
cgit v1.2.3


From ae7e190a3e3498551a1e222eaa84c0ec7e5b41c7 Mon Sep 17 00:00:00 2001
From: Jarkko Sakkinen
Date: Fri, 17 Jun 2016 10:20:14 +0200
Subject: tpm: use tpm_transmit_cmd() in tpm2_probe()

It is better to tpm_transmit_cmd() in tpm2_probe() in order to get
consistent command handling throughout the subsystem.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
---
 drivers/char/tpm/tpm2-cmd.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index a5aa8de23c3d..7df55d58c939 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -941,11 +941,9 @@ int tpm2_probe(struct tpm_chip *chip)
 	cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(0x100);
 	cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1);
 
-	rc = tpm_transmit(chip, (const u8 *)&cmd, sizeof(cmd), 0);
+	rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),  0, NULL);
 	if (rc <  0)
 		return rc;
-	else if (rc < TPM_HEADER_SIZE)
-		return -EFAULT;
 
 	if (be16_to_cpu(cmd.header.out.tag) == TPM2_ST_NO_SESSIONS)
 		chip->flags |= TPM_CHIP_FLAG_TPM2;
-- 
cgit v1.2.3


From 0c541332231e7957f23013e37f3720db33e7804c Mon Sep 17 00:00:00 2001
From: Jarkko Sakkinen
Date: Fri, 17 Jun 2016 13:12:20 +0200
Subject: tpm: use tpm_pcr_read_dev() in tpm_do_selftest()

Instead of a ad-hoc protocol message construction it is better to
call tpm_pcr_read_dev().

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
---
 drivers/char/tpm/tpm-interface.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 6bffb13fb189..3edf2e8798ca 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -782,7 +782,7 @@ int tpm_do_selftest(struct tpm_chip *chip)
 	unsigned int loops;
 	unsigned int delay_msec = 100;
 	unsigned long duration;
-	struct tpm_cmd_t cmd;
+	u8 dummy[TPM_DIGEST_SIZE];
 
 	duration = tpm_calc_ordinal_duration(chip, TPM_ORD_CONTINUE_SELFTEST);
 
@@ -797,9 +797,8 @@ int tpm_do_selftest(struct tpm_chip *chip)
 
 	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, 0);
+		rc = tpm_pcr_read_dev(chip, 0, dummy);
+
 		/* 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. */
@@ -814,7 +813,6 @@ int tpm_do_selftest(struct tpm_chip *chip)
 		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);
-- 
cgit v1.2.3


From 72fd50e14e46dc0edf360631bdece87c2f066a97 Mon Sep 17 00:00:00 2001
From: Jarkko Sakkinen
Date: Fri, 2 Sep 2016 22:34:17 +0300
Subject: tpm_crb: fix crb_req_canceled behavior

The req_canceled() callback is used by tpm_transmit() periodically to
check whether the request has been canceled while it is receiving a
response from the TPM.

The TPM_CRB_CTRL_CANCEL register was cleared already in the crb_cancel
callback, which has two consequences:

* Cancel might not happen.
* req_canceled() always returns zero.

A better place to clear the register is when starting to send a new
command. The behavior of TPM_CRB_CTRL_CANCEL is described in the
section 5.5.3.6 of the PTP specification.

CC: stable@vger.kernel.org
Fixes: 30fc8d138e91 ("tpm: TPM 2.0 CRB Interface")
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/char/tpm/tpm_crb.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index 018c382554ba..1801f382377e 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -142,6 +142,11 @@ static int crb_send(struct tpm_chip *chip, u8 *buf, size_t len)
 	struct crb_priv *priv = dev_get_drvdata(&chip->dev);
 	int rc = 0;
 
+	/* Zero the cancel register so that the next command will not get
+	 * canceled.
+	 */
+	iowrite32(0, &priv->cca->cancel);
+
 	if (len > ioread32(&priv->cca->cmd_size)) {
 		dev_err(&chip->dev,
 			"invalid command count value %x %zx\n",
@@ -175,8 +180,6 @@ static void crb_cancel(struct tpm_chip *chip)
 
 	if ((priv->flags & CRB_FL_ACPI_START) && crb_do_acpi_start(chip))
 		dev_err(&chip->dev, "ACPI Start failed\n");
-
-	iowrite32(0, &priv->cca->cancel);
 }
 
 static bool crb_req_canceled(struct tpm_chip *chip, u8 status)
-- 
cgit v1.2.3


From 35fec6f1eb27cd62998a98c3f1b0ecf0578f55e2 Mon Sep 17 00:00:00 2001
From: Jarkko Sakkinen
Date: Fri, 2 Sep 2016 22:34:18 +0300
Subject: tpm_crb: remove wmb()'s

wmb()'s are not needed as iowrite32() is used.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/char/tpm/tpm_crb.c | 3 ---
 1 file changed, 3 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index 1801f382377e..358c47577a2e 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -175,9 +175,6 @@ static void crb_cancel(struct tpm_chip *chip)
 
 	iowrite32(cpu_to_le32(CRB_CANCEL_INVOKE), &priv->cca->cancel);
 
-	/* Make sure that cmd is populated before issuing cancel. */
-	wmb();
-
 	if ((priv->flags & CRB_FL_ACPI_START) && crb_do_acpi_start(chip))
 		dev_err(&chip->dev, "ACPI Start failed\n");
 }
-- 
cgit v1.2.3


From 7fd10d61852d1947005c05575849f21bc32f0acf Mon Sep 17 00:00:00 2001
From: Jarkko Sakkinen
Date: Fri, 2 Sep 2016 22:34:19 +0300
Subject: tpm_crb: refine the naming of constants

Renamed CRB protocol specific constants to match the TCG PC Client
Platform TPM Profile (PTP) Specification and driver status constants
to be explicit that they are driver specific.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/char/tpm/tpm_crb.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index 358c47577a2e..c8b0d91d9790 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -34,14 +34,14 @@ enum crb_defaults {
 	CRB_ACPI_START_INDEX = 1,
 };
 
-enum crb_ca_request {
-	CRB_CA_REQ_GO_IDLE	= BIT(0),
-	CRB_CA_REQ_CMD_READY	= BIT(1),
+enum crb_ctrl_req {
+	CRB_CTRL_REQ_GO_IDLE	= BIT(0),
+	CRB_CTRL_REQ_CMD_READY	= BIT(1),
 };
 
-enum crb_ca_status {
-	CRB_CA_STS_ERROR	= BIT(0),
-	CRB_CA_STS_TPM_IDLE	= BIT(1),
+enum crb_ctrl_sts {
+	CRB_CTRL_STS_ERROR	= BIT(0),
+	CRB_CTRL_STS_TPM_IDLE	= BIT(1),
 };
 
 enum crb_start {
@@ -67,7 +67,7 @@ struct crb_control_area {
 } __packed;
 
 enum crb_status {
-	CRB_STS_COMPLETE	= BIT(0),
+	CRB_DRV_STS_COMPLETE	= BIT(0),
 };
 
 enum crb_flags {
@@ -92,7 +92,7 @@ static u8 crb_status(struct tpm_chip *chip)
 
 	if ((ioread32(&priv->cca->start) & CRB_START_INVOKE) !=
 	    CRB_START_INVOKE)
-		sts |= CRB_STS_COMPLETE;
+		sts |= CRB_DRV_STS_COMPLETE;
 
 	return sts;
 }
@@ -106,7 +106,7 @@ static int crb_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 	if (count < 6)
 		return -EIO;
 
-	if (ioread32(&priv->cca->sts) & CRB_CA_STS_ERROR)
+	if (ioread32(&priv->cca->sts) & CRB_CTRL_STS_ERROR)
 		return -EIO;
 
 	memcpy_fromio(buf, priv->rsp, 6);
@@ -194,8 +194,8 @@ static const struct tpm_class_ops tpm_crb = {
 	.send = crb_send,
 	.cancel = crb_cancel,
 	.req_canceled = crb_req_canceled,
-	.req_complete_mask = CRB_STS_COMPLETE,
-	.req_complete_val = CRB_STS_COMPLETE,
+	.req_complete_mask = CRB_DRV_STS_COMPLETE,
+	.req_complete_val = CRB_DRV_STS_COMPLETE,
 };
 
 static int crb_init(struct acpi_device *device, struct crb_priv *priv)
-- 
cgit v1.2.3


From f39a9e97d77cae603e70c78ac82c181f93455fd1 Mon Sep 17 00:00:00 2001
From: Jarkko Sakkinen
Date: Fri, 2 Sep 2016 22:34:20 +0300
Subject: tpm_crb: fix incorrect values of cmdReady and goIdle bits

CRB_CTRL_CMD_READY and CRB_CTRL_GO_IDLE have incorrect values.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/char/tpm/tpm_crb.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index c8b0d91d9790..7f602dc1f9bb 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -35,8 +35,8 @@ enum crb_defaults {
 };
 
 enum crb_ctrl_req {
-	CRB_CTRL_REQ_GO_IDLE	= BIT(0),
-	CRB_CTRL_REQ_CMD_READY	= BIT(1),
+	CRB_CTRL_REQ_CMD_READY	= BIT(0),
+	CRB_CTRL_REQ_GO_IDLE	= BIT(1),
 };
 
 enum crb_ctrl_sts {
-- 
cgit v1.2.3


From 56af322156dbe93b3fdc80ac4dff1fc93cb44825 Mon Sep 17 00:00:00 2001
From: Tomas Winkler
Date: Thu, 8 Sep 2016 02:01:02 +0300
Subject: tpm/tpm_tis: remove unused itpm variable

Fixes the warning:
drivers/char/tpm/tpm_tis_core.c:443:7: warning: variable ‘itpm’ set but
not used [-Wunused-but-set-variable]
  bool itpm;
       ^~~~

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Acked-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/char/tpm/tpm_tis_core.c | 5 -----
 1 file changed, 5 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index f22caf802e56..e3bf31b37138 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -440,7 +440,6 @@ static int probe_itpm(struct tpm_chip *chip)
 		0x00, 0x00, 0x00, 0xf1
 	};
 	size_t len = sizeof(cmd_getticks);
-	bool itpm;
 	u16 vendor;
 
 	rc = tpm_tis_read16(priv, TPM_DID_VID(0), &vendor);
@@ -451,8 +450,6 @@ static int probe_itpm(struct tpm_chip *chip)
 	if (vendor != TPM_VID_INTEL)
 		return 0;
 
-	itpm = false;
-
 	rc = tpm_tis_send_data(chip, cmd_getticks, len);
 	if (rc == 0)
 		goto out;
@@ -460,8 +457,6 @@ static int probe_itpm(struct tpm_chip *chip)
 	tpm_tis_ready(chip);
 	release_locality(chip, priv->locality, 0);
 
-	itpm = true;
-
 	rc = tpm_tis_send_data(chip, cmd_getticks, len);
 	if (rc == 0) {
 		dev_info(&chip->dev, "Detected an iTPM.\n");
-- 
cgit v1.2.3


From 71801310b12b65b1fd3285cc899ecbf52c4f8ff3 Mon Sep 17 00:00:00 2001
From: Tomas Winkler
Date: Mon, 12 Sep 2016 02:03:52 +0300
Subject: tmp/tpm_crb: drop include to platform_device

The platform device is not used in this driver, drop the
include to linux/platform_device.h

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/char/tpm/tpm_crb.c | 1 -
 1 file changed, 1 deletion(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index 7f602dc1f9bb..e76a8ee20074 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -19,7 +19,6 @@
 #include <linux/highmem.h>
 #include <linux/rculist.h>
 #include <linux/module.h>
-#include <linux/platform_device.h>
 #include "tpm.h"
 
 #define ACPI_SIG_TPM2 "TPM2"
-- 
cgit v1.2.3


From aa77ea0e43dc5bb0c1dcc9bad76afaa7faca8cab Mon Sep 17 00:00:00 2001
From: Tomas Winkler
Date: Mon, 12 Sep 2016 13:52:10 +0300
Subject: tpm/tpm_crb: cache cmd_size register value.

Instead of expensive register access on retrieving cmd_size
on each send, save the value during initialization in the private
context. The value doesn't change.

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>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/char/tpm/tpm_crb.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index e76a8ee20074..18b5b83af36d 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -80,6 +80,7 @@ struct crb_priv {
 	struct crb_control_area __iomem *cca;
 	u8 __iomem *cmd;
 	u8 __iomem *rsp;
+	u32 cmd_size;
 };
 
 static SIMPLE_DEV_PM_OPS(crb_pm, tpm_pm_suspend, tpm_pm_resume);
@@ -146,11 +147,9 @@ static int crb_send(struct tpm_chip *chip, u8 *buf, size_t len)
 	 */
 	iowrite32(0, &priv->cca->cancel);
 
-	if (len > ioread32(&priv->cca->cmd_size)) {
-		dev_err(&chip->dev,
-			"invalid command count value %x %zx\n",
-			(unsigned int) len,
-			(size_t) ioread32(&priv->cca->cmd_size));
+	if (len > priv->cmd_size) {
+		dev_err(&chip->dev, "invalid command count value %zd %d\n",
+			len, priv->cmd_size);
 		return -E2BIG;
 	}
 
@@ -301,6 +300,7 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
 		dev_err(dev, FW_BUG "overlapping command and response buffer sizes are not identical");
 		return -EINVAL;
 	}
+	priv->cmd_size = cmd_size;
 
 	priv->rsp = priv->cmd;
 	return 0;
-- 
cgit v1.2.3


From 47de683afa7d1b9638a7d6817826d0cdc72b0e1a Mon Sep 17 00:00:00 2001
From: Tomas Winkler
Date: Mon, 12 Sep 2016 14:27:09 +0300
Subject: tpm/tpm_crb: drop useless cpu_to_le32 when writing to registers

Don't apply endianity conversion when writing to the registers
this is already handled by the system.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/char/tpm/tpm_crb.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index 18b5b83af36d..ceea7e256a6d 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -159,7 +159,7 @@ static int crb_send(struct tpm_chip *chip, u8 *buf, size_t len)
 	wmb();
 
 	if (priv->flags & CRB_FL_CRB_START)
-		iowrite32(cpu_to_le32(CRB_START_INVOKE), &priv->cca->start);
+		iowrite32(CRB_START_INVOKE, &priv->cca->start);
 
 	if (priv->flags & CRB_FL_ACPI_START)
 		rc = crb_do_acpi_start(chip);
@@ -171,7 +171,7 @@ static void crb_cancel(struct tpm_chip *chip)
 {
 	struct crb_priv *priv = dev_get_drvdata(&chip->dev);
 
-	iowrite32(cpu_to_le32(CRB_CANCEL_INVOKE), &priv->cca->cancel);
+	iowrite32(CRB_CANCEL_INVOKE, &priv->cca->cancel);
 
 	if ((priv->flags & CRB_FL_ACPI_START) && crb_do_acpi_start(chip))
 		dev_err(&chip->dev, "ACPI Start failed\n");
-- 
cgit v1.2.3


From 64fba530e9ef81469b6dc65bf8e00ed9e90192c7 Mon Sep 17 00:00:00 2001
From: Tomas Winkler
Date: Mon, 12 Sep 2016 02:03:55 +0300
Subject: tpm/tpm_crb: fix the over 80 characters checkpatch warring

Because of the line break in the debug print the chackpatch is
not silent on 80 characters limitation.

The easiest fix is to straighten the lines, it's also more readable.

WARNING: line over 80 characters
+                       FW_BUG "TPM2 ACPI table does not define a memory
resource\n");

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/char/tpm/tpm_crb.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index ceea7e256a6d..a7c870af916c 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -263,8 +263,7 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
 	acpi_dev_free_resource_list(&resources);
 
 	if (resource_type(&io_res) != IORESOURCE_MEM) {
-		dev_err(dev,
-			FW_BUG "TPM2 ACPI table does not define a memory resource\n");
+		dev_err(dev, FW_BUG "TPM2 ACPI table does not define a memory resource\n");
 		return -EINVAL;
 	}
 
-- 
cgit v1.2.3


From 0014777f989b54193bec95a0a153fa4a139183c7 Mon Sep 17 00:00:00 2001
From: Julia Lawall
Date: Sun, 11 Sep 2016 15:05:52 +0200
Subject: tpm: constify TPM 1.x header structures

Constify TPM 1.x header structures in order to move them to rodata
section as they are meant to be never changed during runtime.

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/char/tpm/tpm-interface.c | 10 +++++-----
 drivers/char/tpm/tpm-sysfs.c     |  2 +-
 2 files changed, 6 insertions(+), 6 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 3edf2e8798ca..3970f843acd1 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -623,7 +623,7 @@ 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 = {
+static const 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),
@@ -649,7 +649,7 @@ static int tpm_continue_selftest(struct tpm_chip *chip)
 
 #define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
 #define READ_PCR_RESULT_SIZE 30
-static struct tpm_input_header pcrread_header = {
+static const struct tpm_input_header pcrread_header = {
 	.tag = TPM_TAG_RQU_COMMAND,
 	.length = cpu_to_be32(14),
 	.ordinal = TPM_ORDINAL_PCRREAD
@@ -735,7 +735,7 @@ EXPORT_SYMBOL_GPL(tpm_pcr_read);
  */
 #define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
 #define EXTEND_PCR_RESULT_SIZE 34
-static struct tpm_input_header pcrextend_header = {
+static const struct tpm_input_header pcrextend_header = {
 	.tag = TPM_TAG_RQU_COMMAND,
 	.length = cpu_to_be32(34),
 	.ordinal = TPM_ORD_PCR_EXTEND
@@ -937,7 +937,7 @@ EXPORT_SYMBOL_GPL(wait_for_tpm_stat);
 #define TPM_ORD_SAVESTATE cpu_to_be32(152)
 #define SAVESTATE_RESULT_SIZE 10
 
-static struct tpm_input_header savestate_header = {
+static const struct tpm_input_header savestate_header = {
 	.tag = TPM_TAG_RQU_COMMAND,
 	.length = cpu_to_be32(10),
 	.ordinal = TPM_ORD_SAVESTATE
@@ -1021,7 +1021,7 @@ int tpm_pm_resume(struct device *dev)
 EXPORT_SYMBOL_GPL(tpm_pm_resume);
 
 #define TPM_GETRANDOM_RESULT_SIZE	18
-static struct tpm_input_header tpm_getrandom_header = {
+static const struct tpm_input_header tpm_getrandom_header = {
 	.tag = TPM_TAG_RQU_COMMAND,
 	.length = cpu_to_be32(14),
 	.ordinal = TPM_ORD_GET_RANDOM
diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
index e1f7236c115c..a76ab4af9fb2 100644
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -22,7 +22,7 @@
 
 #define READ_PUBEK_RESULT_SIZE 314
 #define TPM_ORD_READPUBEK cpu_to_be32(124)
-static struct tpm_input_header tpm_readpubek_header = {
+static const struct tpm_input_header tpm_readpubek_header = {
 	.tag = TPM_TAG_RQU_COMMAND,
 	.length = cpu_to_be32(30),
 	.ordinal = TPM_ORD_READPUBEK
-- 
cgit v1.2.3


From ebfd7532e985818a327906e011f3e43c8ddfdd74 Mon Sep 17 00:00:00 2001
From: Jarkko Sakkinen
Date: Mon, 12 Sep 2016 13:43:30 +0300
Subject: tpm: add check for minimum buffer size in tpm_transmit()

tpm_transmit() does not check that bufsiz is at least TPM_HEADER_SIZE
before accessing data. This commit adds this check and returns -EINVAL
if it fails.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/char/tpm/tpm-interface.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 3970f843acd1..8de61876f633 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -337,6 +337,9 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz,
 	u32 count, ordinal;
 	unsigned long stop;
 
+	if (bufsiz < TPM_HEADER_SIZE)
+		return -EINVAL;
+
 	if (bufsiz > TPM_BUFSIZE)
 		bufsiz = TPM_BUFSIZE;
 
-- 
cgit v1.2.3


From e17acbbb69d30836a8c12e2c09bbefab8656693e Mon Sep 17 00:00:00 2001
From: Winkler, Tomas
Date: Thu, 15 Sep 2016 10:27:38 +0300
Subject: tpm/tpm_crb: implement tpm crb idle state

The register TPM_CRB_CTRL_REQ_x contains bits goIdle and cmdReady for
SW to indicate that the device can enter or should exit the idle state.

The legacy ACPI-start (SMI + DMA) based devices do not support these
bits and the idle state management is not exposed to the host SW.
Thus, this functionality only is enabled only for a CRB start (MMIO)
based devices.

Based on Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
original patch:
'tpm_crb: implement power tpm crb power management'

To keep the implementation local to the hw we don't use wait_for_tpm_stat
for polling the TPM_CRB_CTRL_REQ.

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>
---
 drivers/char/tpm/tpm_crb.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index a7c870af916c..466d12b7fd46 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -83,6 +83,75 @@ struct crb_priv {
 	u32 cmd_size;
 };
 
+/**
+ * crb_go_idle - request tpm crb device to go the idle state
+ *
+ * @dev:  crb device
+ * @priv: crb private data
+ *
+ * Write CRB_CTRL_REQ_GO_IDLE to TPM_CRB_CTRL_REQ
+ * The device should respond within TIMEOUT_C by clearing the bit.
+ * Anyhow, we do not wait here as a consequent CMD_READY request
+ * will be handled correctly even if idle was not completed.
+ *
+ * The function does nothing for devices with ACPI-start method.
+ *
+ * Return: 0 always
+ */
+static int __maybe_unused crb_go_idle(struct device *dev, struct crb_priv *priv)
+{
+	if (priv->flags & CRB_FL_ACPI_START)
+		return 0;
+
+	iowrite32(CRB_CTRL_REQ_GO_IDLE, &priv->cca->req);
+	/* we don't really care when this settles */
+
+	return 0;
+}
+
+/**
+ * crb_cmd_ready - request tpm crb device to enter ready state
+ *
+ * @dev:  crb device
+ * @priv: crb private data
+ *
+ * Write CRB_CTRL_REQ_CMD_READY to TPM_CRB_CTRL_REQ
+ * and poll till the device acknowledge it by clearing the bit.
+ * The device should respond within TIMEOUT_C.
+ *
+ * The function does nothing for devices with ACPI-start method
+ *
+ * Return: 0 on success -ETIME on timeout;
+ */
+static int __maybe_unused crb_cmd_ready(struct device *dev,
+					struct crb_priv *priv)
+{
+	ktime_t stop, start;
+
+	if (priv->flags & CRB_FL_ACPI_START)
+		return 0;
+
+	iowrite32(CRB_CTRL_REQ_CMD_READY, &priv->cca->req);
+
+	start = ktime_get();
+	stop = ktime_add(start, ms_to_ktime(TPM2_TIMEOUT_C));
+	do {
+		if (!(ioread32(&priv->cca->req) & CRB_CTRL_REQ_CMD_READY)) {
+			dev_dbg(dev, "cmdReady in %lld usecs\n",
+				ktime_to_us(ktime_sub(ktime_get(), start)));
+			return 0;
+		}
+		usleep_range(50, 100);
+	} while (ktime_before(ktime_get(), stop));
+
+	if (ioread32(&priv->cca->req) & CRB_CTRL_REQ_CMD_READY) {
+		dev_warn(dev, "cmdReady timed out\n");
+		return -ETIME;
+	}
+
+	return 0;
+}
+
 static SIMPLE_DEV_PM_OPS(crb_pm, tpm_pm_suspend, tpm_pm_resume);
 
 static u8 crb_status(struct tpm_chip *chip)
-- 
cgit v1.2.3


From 9514ff1961c6f0f5983ba72d94f384bc13e0d4a1 Mon Sep 17 00:00:00 2001
From: Winkler, Tomas
Date: Mon, 12 Sep 2016 16:04:19 +0300
Subject: tmp/tpm_crb: fix Intel PTT hw bug during idle state

There is a HW bug in Skylake, and Broxton PCH Intel PTT device, where
most of the registers in the control area except START, REQUEST, CANCEL,
and LOC_CTRL lost retention when the device is in the idle state. Hence
we need to bring the device to ready state before accessing the other
registers. The fix brings device to ready state before trying to read
command and response buffer addresses in order to remap the for access.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinn@linux.intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinn@linux.intel.com>
---
 drivers/char/tpm/tpm_crb.c | 47 ++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 39 insertions(+), 8 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index 466d12b7fd46..2d1669c0f6c0 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -318,6 +318,7 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
 	struct list_head resources;
 	struct resource io_res;
 	struct device *dev = &device->dev;
+	u32 pa_high, pa_low;
 	u64 cmd_pa;
 	u32 cmd_size;
 	u64 rsp_pa;
@@ -345,12 +346,27 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
 	if (IS_ERR(priv->cca))
 		return PTR_ERR(priv->cca);
 
-	cmd_pa = ((u64) ioread32(&priv->cca->cmd_pa_high) << 32) |
-		  (u64) ioread32(&priv->cca->cmd_pa_low);
+	/*
+	 * PTT HW bug w/a: wake up the device to access
+	 * possibly not retained registers.
+	 */
+	ret = crb_cmd_ready(dev, priv);
+	if (ret)
+		return ret;
+
+	pa_high = ioread32(&priv->cca->cmd_pa_high);
+	pa_low  = ioread32(&priv->cca->cmd_pa_low);
+	cmd_pa = ((u64)pa_high << 32) | pa_low;
 	cmd_size = ioread32(&priv->cca->cmd_size);
+
+	dev_dbg(dev, "cmd_hi = %X cmd_low = %X cmd_size %X\n",
+		pa_high, pa_low, cmd_size);
+
 	priv->cmd = crb_map_res(dev, priv, &io_res, cmd_pa, cmd_size);
-	if (IS_ERR(priv->cmd))
-		return PTR_ERR(priv->cmd);
+	if (IS_ERR(priv->cmd)) {
+		ret = PTR_ERR(priv->cmd);
+		goto out;
+	}
 
 	memcpy_fromio(&rsp_pa, &priv->cca->rsp_pa, 8);
 	rsp_pa = le64_to_cpu(rsp_pa);
@@ -358,7 +374,8 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
 
 	if (cmd_pa != rsp_pa) {
 		priv->rsp = crb_map_res(dev, priv, &io_res, rsp_pa, rsp_size);
-		return PTR_ERR_OR_ZERO(priv->rsp);
+		ret = PTR_ERR_OR_ZERO(priv->rsp);
+		goto out;
 	}
 
 	/* According to the PTP specification, overlapping command and response
@@ -366,12 +383,18 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
 	 */
 	if (cmd_size != rsp_size) {
 		dev_err(dev, FW_BUG "overlapping command and response buffer sizes are not identical");
-		return -EINVAL;
+		ret = -EINVAL;
+		goto out;
 	}
+
 	priv->cmd_size = cmd_size;
 
 	priv->rsp = priv->cmd;
-	return 0;
+
+out:
+	crb_go_idle(dev, priv);
+
+	return ret;
 }
 
 static int crb_acpi_add(struct acpi_device *device)
@@ -415,7 +438,15 @@ static int crb_acpi_add(struct acpi_device *device)
 	if (rc)
 		return rc;
 
-	return crb_init(device, priv);
+	rc  = crb_cmd_ready(dev, priv);
+	if (rc)
+		return rc;
+
+	rc = crb_init(device, priv);
+	if (rc)
+		crb_go_idle(dev, priv);
+
+	return rc;
 }
 
 static int crb_acpi_remove(struct acpi_device *device)
-- 
cgit v1.2.3


From 0c22db435bf79d3cf3089df7ff198d4867df3c27 Mon Sep 17 00:00:00 2001
From: Winkler, Tomas
Date: Mon, 12 Sep 2016 16:04:20 +0300
Subject: tpm/tpm_crb: open code the crb_init into acpi_add

This is preparation step for implementing tpm crb
runtime pm. We need to have tpm chip allocated
and populated before we access the runtime handlers.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinn@linux.intel.com>
---
 drivers/char/tpm/tpm_crb.c | 26 ++++++++++----------------
 1 file changed, 10 insertions(+), 16 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index 2d1669c0f6c0..d385e63008a6 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -265,21 +265,6 @@ static const struct tpm_class_ops tpm_crb = {
 	.req_complete_val = CRB_DRV_STS_COMPLETE,
 };
 
-static int crb_init(struct acpi_device *device, struct crb_priv *priv)
-{
-	struct tpm_chip *chip;
-
-	chip = tpmm_chip_alloc(&device->dev, &tpm_crb);
-	if (IS_ERR(chip))
-		return PTR_ERR(chip);
-
-	dev_set_drvdata(&chip->dev, priv);
-	chip->acpi_dev_handle = device->handle;
-	chip->flags = TPM_CHIP_FLAG_TPM2;
-
-	return tpm_chip_register(chip);
-}
-
 static int crb_check_resource(struct acpi_resource *ares, void *data)
 {
 	struct resource *io_res = data;
@@ -401,6 +386,7 @@ static int crb_acpi_add(struct acpi_device *device)
 {
 	struct acpi_table_tpm2 *buf;
 	struct crb_priv *priv;
+	struct tpm_chip *chip;
 	struct device *dev = &device->dev;
 	acpi_status status;
 	u32 sm;
@@ -438,11 +424,19 @@ static int crb_acpi_add(struct acpi_device *device)
 	if (rc)
 		return rc;
 
+	chip = tpmm_chip_alloc(dev, &tpm_crb);
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+
+	dev_set_drvdata(&chip->dev, priv);
+	chip->acpi_dev_handle = device->handle;
+	chip->flags = TPM_CHIP_FLAG_TPM2;
+
 	rc  = crb_cmd_ready(dev, priv);
 	if (rc)
 		return rc;
 
-	rc = crb_init(device, priv);
+	rc = tpm_chip_register(chip);
 	if (rc)
 		crb_go_idle(dev, priv);
 
-- 
cgit v1.2.3


From e350e24694e447e6ab7312fffae5ca31a0bb5165 Mon Sep 17 00:00:00 2001
From: Winkler, Tomas
Date: Mon, 12 Sep 2016 16:04:21 +0300
Subject: tmp/tpm_crb: implement runtime pm for tpm_crb

Utilize runtime_pm for driving tpm crb idle states.
The framework calls cmd_ready from the pm_runtime_resume handler
and go idle from the pm_runtime_suspend handler.
The TPM framework should wake the device before transmit and receive.
In case the runtime_pm framework is not enabled, the device will be in
ready state.

[jarkko.sakkinen@linux.intel.com: changed pm_runtime_put_sync()
 to pm_runtime_put()]

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>
---
 drivers/char/tpm/tpm-interface.c |  5 +++++
 drivers/char/tpm/tpm_crb.c       | 37 ++++++++++++++++++++++++++++++++++---
 2 files changed, 39 insertions(+), 3 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 8de61876f633..77d83c98d67f 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -29,6 +29,7 @@
 #include <linux/mutex.h>
 #include <linux/spinlock.h>
 #include <linux/freezer.h>
+#include <linux/pm_runtime.h>
 
 #include "tpm.h"
 #include "tpm_eventlog.h"
@@ -356,6 +357,8 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz,
 	if (!(flags & TPM_TRANSMIT_UNLOCKED))
 		mutex_lock(&chip->tpm_mutex);
 
+	pm_runtime_get_sync(chip->dev.parent);
+
 	rc = chip->ops->send(chip, (u8 *) buf, count);
 	if (rc < 0) {
 		dev_err(&chip->dev,
@@ -397,6 +400,8 @@ out_recv:
 		dev_err(&chip->dev,
 			"tpm_transmit: tpm_recv: error %zd\n", rc);
 out:
+	pm_runtime_put(chip->dev.parent);
+
 	if (!(flags & TPM_TRANSMIT_UNLOCKED))
 		mutex_unlock(&chip->tpm_mutex);
 	return rc;
diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index d385e63008a6..aa0ef742ac03 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -19,6 +19,7 @@
 #include <linux/highmem.h>
 #include <linux/rculist.h>
 #include <linux/module.h>
+#include <linux/pm_runtime.h>
 #include "tpm.h"
 
 #define ACPI_SIG_TPM2 "TPM2"
@@ -152,8 +153,6 @@ static int __maybe_unused crb_cmd_ready(struct device *dev,
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(crb_pm, tpm_pm_suspend, tpm_pm_resume);
-
 static u8 crb_status(struct tpm_chip *chip)
 {
 	struct crb_priv *priv = dev_get_drvdata(&chip->dev);
@@ -436,9 +435,16 @@ static int crb_acpi_add(struct acpi_device *device)
 	if (rc)
 		return rc;
 
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
 	rc = tpm_chip_register(chip);
-	if (rc)
+	if (rc) {
 		crb_go_idle(dev, priv);
+		pm_runtime_disable(dev);
+	}
+
+	pm_runtime_put(dev);
 
 	return rc;
 }
@@ -450,9 +456,34 @@ static int crb_acpi_remove(struct acpi_device *device)
 
 	tpm_chip_unregister(chip);
 
+	pm_runtime_disable(dev);
+
 	return 0;
 }
 
+#ifdef CONFIG_PM
+static int crb_pm_runtime_suspend(struct device *dev)
+{
+	struct tpm_chip *chip = dev_get_drvdata(dev);
+	struct crb_priv *priv = dev_get_drvdata(&chip->dev);
+
+	return crb_go_idle(dev, priv);
+}
+
+static int crb_pm_runtime_resume(struct device *dev)
+{
+	struct tpm_chip *chip = dev_get_drvdata(dev);
+	struct crb_priv *priv = dev_get_drvdata(&chip->dev);
+
+	return crb_cmd_ready(dev, priv);
+}
+#endif /* CONFIG_PM */
+
+static const struct dev_pm_ops crb_pm = {
+	SET_SYSTEM_SLEEP_PM_OPS(tpm_pm_suspend, tpm_pm_resume)
+	SET_RUNTIME_PM_OPS(crb_pm_runtime_suspend, crb_pm_runtime_resume, NULL)
+};
+
 static struct acpi_device_id crb_device_ids[] = {
 	{"MSFT0101", 0},
 	{"", 0},
-- 
cgit v1.2.3


From 4886cd80cb8eab175a527f82ea8fc676e70309fa Mon Sep 17 00:00:00 2001
From: Jarkko Sakkinen
Date: Tue, 27 Sep 2016 12:00:13 +0300
Subject: Revert "tmp/tpm_crb: implement runtime pm for tpm_crb"

This reverts commit e350e24694e447e6ab7312fffae5ca31a0bb5165.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/char/tpm/tpm-interface.c |  5 -----
 drivers/char/tpm/tpm_crb.c       | 37 +++----------------------------------
 2 files changed, 3 insertions(+), 39 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 77d83c98d67f..8de61876f633 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -29,7 +29,6 @@
 #include <linux/mutex.h>
 #include <linux/spinlock.h>
 #include <linux/freezer.h>
-#include <linux/pm_runtime.h>
 
 #include "tpm.h"
 #include "tpm_eventlog.h"
@@ -357,8 +356,6 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz,
 	if (!(flags & TPM_TRANSMIT_UNLOCKED))
 		mutex_lock(&chip->tpm_mutex);
 
-	pm_runtime_get_sync(chip->dev.parent);
-
 	rc = chip->ops->send(chip, (u8 *) buf, count);
 	if (rc < 0) {
 		dev_err(&chip->dev,
@@ -400,8 +397,6 @@ out_recv:
 		dev_err(&chip->dev,
 			"tpm_transmit: tpm_recv: error %zd\n", rc);
 out:
-	pm_runtime_put(chip->dev.parent);
-
 	if (!(flags & TPM_TRANSMIT_UNLOCKED))
 		mutex_unlock(&chip->tpm_mutex);
 	return rc;
diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index aa0ef742ac03..d385e63008a6 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -19,7 +19,6 @@
 #include <linux/highmem.h>
 #include <linux/rculist.h>
 #include <linux/module.h>
-#include <linux/pm_runtime.h>
 #include "tpm.h"
 
 #define ACPI_SIG_TPM2 "TPM2"
@@ -153,6 +152,8 @@ static int __maybe_unused crb_cmd_ready(struct device *dev,
 	return 0;
 }
 
+static SIMPLE_DEV_PM_OPS(crb_pm, tpm_pm_suspend, tpm_pm_resume);
+
 static u8 crb_status(struct tpm_chip *chip)
 {
 	struct crb_priv *priv = dev_get_drvdata(&chip->dev);
@@ -435,16 +436,9 @@ static int crb_acpi_add(struct acpi_device *device)
 	if (rc)
 		return rc;
 
-	pm_runtime_set_active(dev);
-	pm_runtime_enable(dev);
-
 	rc = tpm_chip_register(chip);
-	if (rc) {
+	if (rc)
 		crb_go_idle(dev, priv);
-		pm_runtime_disable(dev);
-	}
-
-	pm_runtime_put(dev);
 
 	return rc;
 }
@@ -456,34 +450,9 @@ static int crb_acpi_remove(struct acpi_device *device)
 
 	tpm_chip_unregister(chip);
 
-	pm_runtime_disable(dev);
-
 	return 0;
 }
 
-#ifdef CONFIG_PM
-static int crb_pm_runtime_suspend(struct device *dev)
-{
-	struct tpm_chip *chip = dev_get_drvdata(dev);
-	struct crb_priv *priv = dev_get_drvdata(&chip->dev);
-
-	return crb_go_idle(dev, priv);
-}
-
-static int crb_pm_runtime_resume(struct device *dev)
-{
-	struct tpm_chip *chip = dev_get_drvdata(dev);
-	struct crb_priv *priv = dev_get_drvdata(&chip->dev);
-
-	return crb_cmd_ready(dev, priv);
-}
-#endif /* CONFIG_PM */
-
-static const struct dev_pm_ops crb_pm = {
-	SET_SYSTEM_SLEEP_PM_OPS(tpm_pm_suspend, tpm_pm_resume)
-	SET_RUNTIME_PM_OPS(crb_pm_runtime_suspend, crb_pm_runtime_resume, NULL)
-};
-
 static struct acpi_device_id crb_device_ids[] = {
 	{"MSFT0101", 0},
 	{"", 0},
-- 
cgit v1.2.3


From 2b7926ae1cd44efb006e16d5d165700e5f673294 Mon Sep 17 00:00:00 2001
From: Jarkko Sakkinen
Date: Tue, 27 Sep 2016 12:01:13 +0300
Subject: Revert "tpm/tpm_crb: open code the crb_init into acpi_add"

This reverts commit 0c22db435bf79d3cf3089df7ff198d4867df3c27.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/char/tpm/tpm_crb.c | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index d385e63008a6..2d1669c0f6c0 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -265,6 +265,21 @@ static const struct tpm_class_ops tpm_crb = {
 	.req_complete_val = CRB_DRV_STS_COMPLETE,
 };
 
+static int crb_init(struct acpi_device *device, struct crb_priv *priv)
+{
+	struct tpm_chip *chip;
+
+	chip = tpmm_chip_alloc(&device->dev, &tpm_crb);
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+
+	dev_set_drvdata(&chip->dev, priv);
+	chip->acpi_dev_handle = device->handle;
+	chip->flags = TPM_CHIP_FLAG_TPM2;
+
+	return tpm_chip_register(chip);
+}
+
 static int crb_check_resource(struct acpi_resource *ares, void *data)
 {
 	struct resource *io_res = data;
@@ -386,7 +401,6 @@ static int crb_acpi_add(struct acpi_device *device)
 {
 	struct acpi_table_tpm2 *buf;
 	struct crb_priv *priv;
-	struct tpm_chip *chip;
 	struct device *dev = &device->dev;
 	acpi_status status;
 	u32 sm;
@@ -424,19 +438,11 @@ static int crb_acpi_add(struct acpi_device *device)
 	if (rc)
 		return rc;
 
-	chip = tpmm_chip_alloc(dev, &tpm_crb);
-	if (IS_ERR(chip))
-		return PTR_ERR(chip);
-
-	dev_set_drvdata(&chip->dev, priv);
-	chip->acpi_dev_handle = device->handle;
-	chip->flags = TPM_CHIP_FLAG_TPM2;
-
 	rc  = crb_cmd_ready(dev, priv);
 	if (rc)
 		return rc;
 
-	rc = tpm_chip_register(chip);
+	rc = crb_init(device, priv);
 	if (rc)
 		crb_go_idle(dev, priv);
 
-- 
cgit v1.2.3


From cfa188220363647c332028c094eb4cae86c918ad Mon Sep 17 00:00:00 2001
From: Jarkko Sakkinen
Date: Tue, 27 Sep 2016 12:01:43 +0300
Subject: Revert "tmp/tpm_crb: fix Intel PTT hw bug during idle state"

This reverts commit 9514ff1961c6f0f5983ba72d94f384bc13e0d4a1.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/char/tpm/tpm_crb.c | 47 ++++++++--------------------------------------
 1 file changed, 8 insertions(+), 39 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index 2d1669c0f6c0..466d12b7fd46 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -318,7 +318,6 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
 	struct list_head resources;
 	struct resource io_res;
 	struct device *dev = &device->dev;
-	u32 pa_high, pa_low;
 	u64 cmd_pa;
 	u32 cmd_size;
 	u64 rsp_pa;
@@ -346,27 +345,12 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
 	if (IS_ERR(priv->cca))
 		return PTR_ERR(priv->cca);
 
-	/*
-	 * PTT HW bug w/a: wake up the device to access
-	 * possibly not retained registers.
-	 */
-	ret = crb_cmd_ready(dev, priv);
-	if (ret)
-		return ret;
-
-	pa_high = ioread32(&priv->cca->cmd_pa_high);
-	pa_low  = ioread32(&priv->cca->cmd_pa_low);
-	cmd_pa = ((u64)pa_high << 32) | pa_low;
+	cmd_pa = ((u64) ioread32(&priv->cca->cmd_pa_high) << 32) |
+		  (u64) ioread32(&priv->cca->cmd_pa_low);
 	cmd_size = ioread32(&priv->cca->cmd_size);
-
-	dev_dbg(dev, "cmd_hi = %X cmd_low = %X cmd_size %X\n",
-		pa_high, pa_low, cmd_size);
-
 	priv->cmd = crb_map_res(dev, priv, &io_res, cmd_pa, cmd_size);
-	if (IS_ERR(priv->cmd)) {
-		ret = PTR_ERR(priv->cmd);
-		goto out;
-	}
+	if (IS_ERR(priv->cmd))
+		return PTR_ERR(priv->cmd);
 
 	memcpy_fromio(&rsp_pa, &priv->cca->rsp_pa, 8);
 	rsp_pa = le64_to_cpu(rsp_pa);
@@ -374,8 +358,7 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
 
 	if (cmd_pa != rsp_pa) {
 		priv->rsp = crb_map_res(dev, priv, &io_res, rsp_pa, rsp_size);
-		ret = PTR_ERR_OR_ZERO(priv->rsp);
-		goto out;
+		return PTR_ERR_OR_ZERO(priv->rsp);
 	}
 
 	/* According to the PTP specification, overlapping command and response
@@ -383,18 +366,12 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
 	 */
 	if (cmd_size != rsp_size) {
 		dev_err(dev, FW_BUG "overlapping command and response buffer sizes are not identical");
-		ret = -EINVAL;
-		goto out;
+		return -EINVAL;
 	}
-
 	priv->cmd_size = cmd_size;
 
 	priv->rsp = priv->cmd;
-
-out:
-	crb_go_idle(dev, priv);
-
-	return ret;
+	return 0;
 }
 
 static int crb_acpi_add(struct acpi_device *device)
@@ -438,15 +415,7 @@ static int crb_acpi_add(struct acpi_device *device)
 	if (rc)
 		return rc;
 
-	rc  = crb_cmd_ready(dev, priv);
-	if (rc)
-		return rc;
-
-	rc = crb_init(device, priv);
-	if (rc)
-		crb_go_idle(dev, priv);
-
-	return rc;
+	return crb_init(device, priv);
 }
 
 static int crb_acpi_remove(struct acpi_device *device)
-- 
cgit v1.2.3


From 324152502b0ef2f65a3fe039b7dcd27b223d14ac Mon Sep 17 00:00:00 2001
From: Jarkko Sakkinen
Date: Tue, 27 Sep 2016 12:02:13 +0300
Subject: Revert "tpm/tpm_crb: implement tpm crb idle state"

This reverts commit e17acbbb69d30836a8c12e2c09bbefab8656693e.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/char/tpm/tpm_crb.c | 69 ----------------------------------------------
 1 file changed, 69 deletions(-)

(limited to 'drivers/char')

diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index 466d12b7fd46..a7c870af916c 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -83,75 +83,6 @@ struct crb_priv {
 	u32 cmd_size;
 };
 
-/**
- * crb_go_idle - request tpm crb device to go the idle state
- *
- * @dev:  crb device
- * @priv: crb private data
- *
- * Write CRB_CTRL_REQ_GO_IDLE to TPM_CRB_CTRL_REQ
- * The device should respond within TIMEOUT_C by clearing the bit.
- * Anyhow, we do not wait here as a consequent CMD_READY request
- * will be handled correctly even if idle was not completed.
- *
- * The function does nothing for devices with ACPI-start method.
- *
- * Return: 0 always
- */
-static int __maybe_unused crb_go_idle(struct device *dev, struct crb_priv *priv)
-{
-	if (priv->flags & CRB_FL_ACPI_START)
-		return 0;
-
-	iowrite32(CRB_CTRL_REQ_GO_IDLE, &priv->cca->req);
-	/* we don't really care when this settles */
-
-	return 0;
-}
-
-/**
- * crb_cmd_ready - request tpm crb device to enter ready state
- *
- * @dev:  crb device
- * @priv: crb private data
- *
- * Write CRB_CTRL_REQ_CMD_READY to TPM_CRB_CTRL_REQ
- * and poll till the device acknowledge it by clearing the bit.
- * The device should respond within TIMEOUT_C.
- *
- * The function does nothing for devices with ACPI-start method
- *
- * Return: 0 on success -ETIME on timeout;
- */
-static int __maybe_unused crb_cmd_ready(struct device *dev,
-					struct crb_priv *priv)
-{
-	ktime_t stop, start;
-
-	if (priv->flags & CRB_FL_ACPI_START)
-		return 0;
-
-	iowrite32(CRB_CTRL_REQ_CMD_READY, &priv->cca->req);
-
-	start = ktime_get();
-	stop = ktime_add(start, ms_to_ktime(TPM2_TIMEOUT_C));
-	do {
-		if (!(ioread32(&priv->cca->req) & CRB_CTRL_REQ_CMD_READY)) {
-			dev_dbg(dev, "cmdReady in %lld usecs\n",
-				ktime_to_us(ktime_sub(ktime_get(), start)));
-			return 0;
-		}
-		usleep_range(50, 100);
-	} while (ktime_before(ktime_get(), stop));
-
-	if (ioread32(&priv->cca->req) & CRB_CTRL_REQ_CMD_READY) {
-		dev_warn(dev, "cmdReady timed out\n");
-		return -ETIME;
-	}
-
-	return 0;
-}
-
 static SIMPLE_DEV_PM_OPS(crb_pm, tpm_pm_suspend, tpm_pm_resume);
 
 static u8 crb_status(struct tpm_chip *chip)
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