[PATCH v9 00/17] Removed nested TPM operations

[PATCH v9 00/17] Removed nested TPM operations

[Jarkko Sakkinen]

[was Detach TPM space code out of the tpm_transmit() flow but the scope
 expanded a bit.]

Make the changes necessary to detach TPM space code and TPM activation
code out of the tpm_transmit() flow because of both of these can cause
nested tpm_transmit() calls. The nesteds calls make the whole flow hard
to maintain, and thus, it is better to just fix things now before this
turns into a bigger mess.

v9:
* Fixed again tpm_try_get_ops().
* Added missing reviewed-by's.

v8:
* Re-add the check for ret < 0 after calling tpm_try_transmit() that
  was dropped by mistake while moving code.
* Fix error fallback for tpm_try_get_ops() when tpm_chip_start()
  fails.

v7:
*  Reorganize series so that more trivial and self-contained changes are
   in the head.

v6:
* When tpm_validate_commmand() was moved to tpm2-space.c, the struct for
  the TPM header was incorrectly declared as struct tpm_input_header.
* Fix return value in tpm_validate_command().

v5:
* Add the missing rev's from Stefan Berger.

v4:
* Return 0 from pcrs_show() when tpm1_pcr_read() fails.
* Fix error handling flow in tpm_try_transmit().
* Replace struct tpm_input_header and struct tpm_output_header with
  struct tpm_header.

v3:
* Encapsulate power gating code to tpm_chip_start() and tpm_chip_stop().
* Move TPM power gating code and locking to tpm_try_get_ops() and
  tpm_put_ops().
* Call power gating code directly in tpm_chip_register() and
  tpm2_del_space().

v2:
* Print tpm2_commit_space() error inside tpm2_commit_space()
* Error code was not printed when recv() callback failed. It is
  fixed in this version.
* Added a patch that removes @space from tpm_transmit().
* Fixed a regression in earlier series. Forgot to amend the change
  from the staging area that renames NESTED to UNLOCKED in tpm2-space.c.

Jarkko Sakkinen (17):
  tpm: use tpm_buf in tpm_transmit_cmd() as the IO parameter
  tpm: fix invalid return value in pubek_show()
  tpm: return 0 from pcrs_show() when tpm1_pcr_read() fails
  tpm: print tpm2_commit_space() error inside tpm2_commit_space()
  tpm: declare struct tpm_header
  tpm: access command header through struct in tpm_try_transmit()
  tpm: encapsulate tpm_dev_transmit()
  tpm: call tpm2_flush_space() on error in tpm_try_transmit()
  tpm: clean up tpm_try_transmit() error handling flow
  tpm: move tpm_validate_commmand() to tpm2-space.c
  tpm: move TPM space code out of tpm_transmit()
  tpm: remove @space from tpm_transmit()
  tpm: use tpm_try_get_ops() in tpm-sysfs.c.
  tpm: remove TPM_TRANSMIT_UNLOCKED flag
  tpm: introduce tpm_chip_start() and tpm_chip_stop()
  tpm: take TPM chip power gating out of tpm_transmit()
  tpm: remove @flags from tpm_transmit()

 drivers/char/tpm/tpm-chip.c       | 109 ++++++++++++
 drivers/char/tpm/tpm-dev-common.c |  45 ++++-
 drivers/char/tpm/tpm-interface.c  | 264 ++++++------------------------
 drivers/char/tpm/tpm-sysfs.c      | 138 ++++++++++------
 drivers/char/tpm/tpm.h            |  64 +++-----
 drivers/char/tpm/tpm1-cmd.c       |  28 +---
 drivers/char/tpm/tpm2-cmd.c       |  72 +++-----
 drivers/char/tpm/tpm2-space.c     |  93 ++++++++---
 drivers/char/tpm/tpm_i2c_atmel.c  |   5 +-
 drivers/char/tpm/tpm_vtpm_proxy.c |  12 +-
 drivers/char/tpm/xen-tpmfront.c   |   2 +-
 11 files changed, 410 insertions(+), 422 deletions(-)

-- 
2.19.1

[PATCH v9 05/17] tpm: declare struct tpm_header

[Jarkko Sakkinen]

Decleare struct tpm_header that replaces struct tpm_input_header and
struct tpm_output_header.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
---
 drivers/char/tpm/tpm-interface.c  |  9 ++++-----
 drivers/char/tpm/tpm.h            | 27 ++++++++++++---------------
 drivers/char/tpm/tpm2-cmd.c       |  4 ++--
 drivers/char/tpm/tpm2-space.c     |  6 +++---
 drivers/char/tpm/tpm_i2c_atmel.c  |  5 ++---
 drivers/char/tpm/tpm_vtpm_proxy.c |  8 ++++----
 drivers/char/tpm/xen-tpmfront.c   |  2 +-
 7 files changed, 28 insertions(+), 33 deletions(-)

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 7ac6ada8428c..cb0d44c158ae 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -67,7 +67,7 @@ static int tpm_validate_command(struct tpm_chip *chip,
 				 const u8 *cmd,
 				 size_t len)
 {
-	const struct tpm_input_header *header = (const void *)cmd;
+	const struct tpm_header *header = (const void *)cmd;
 	int i;
 	u32 cc;
 	u32 attrs;
@@ -166,7 +166,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
 				u8 *buf, size_t bufsiz,
 				unsigned int flags)
 {
-	struct tpm_output_header *header = (void *)buf;
+	struct tpm_header *header = (void *)buf;
 	int rc;
 	ssize_t len = 0;
 	u32 count, ordinal;
@@ -316,7 +316,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
 ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
 		     u8 *buf, size_t bufsiz, unsigned int flags)
 {
-	struct tpm_output_header *header = (struct tpm_output_header *)buf;
+	struct tpm_header *header = (struct tpm_header *)buf;
 	/* space for header and handles */
 	u8 save[TPM_HEADER_SIZE + 3*sizeof(u32)];
 	unsigned int delay_msec = TPM2_DURATION_SHORT;
@@ -381,8 +381,7 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space,
 			 struct tpm_buf *buf, size_t min_rsp_body_length,
 			 unsigned int flags, const char *desc)
 {
-	const struct tpm_output_header *header =
-		(struct tpm_output_header *)buf->data;
+	const struct tpm_header *header = (struct tpm_header *)buf->data;
 	int err;
 	ssize_t len;
 
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 49bca4d1e786..86fa8ac0ae20 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -273,16 +273,13 @@ struct tpm_chip {
 
 #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
 
-struct tpm_input_header {
-	__be16	tag;
-	__be32	length;
-	__be32	ordinal;
-} __packed;
-
-struct tpm_output_header {
-	__be16	tag;
-	__be32	length;
-	__be32	return_code;
+struct tpm_header {
+	__be16 tag;
+	__be32 length;
+	union {
+		__be32 ordinal;
+		__be32 return_code;
+	};
 } __packed;
 
 #define TPM_TAG_RQU_COMMAND 193
@@ -401,8 +398,8 @@ struct tpm_buf {
 
 static inline void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal)
 {
-	struct tpm_input_header *head;
-	head = (struct tpm_input_header *)buf->data;
+	struct tpm_header *head = (struct tpm_header *)buf->data;
+
 	head->tag = cpu_to_be16(tag);
 	head->length = cpu_to_be32(sizeof(*head));
 	head->ordinal = cpu_to_be32(ordinal);
@@ -428,14 +425,14 @@ static inline void tpm_buf_destroy(struct tpm_buf *buf)
 
 static inline u32 tpm_buf_length(struct tpm_buf *buf)
 {
-	struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
+	struct tpm_header *head = (struct tpm_header *) buf->data;
 
 	return be32_to_cpu(head->length);
 }
 
 static inline u16 tpm_buf_tag(struct tpm_buf *buf)
 {
-	struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
+	struct tpm_header *head = (struct tpm_header *) buf->data;
 
 	return be16_to_cpu(head->tag);
 }
@@ -444,7 +441,7 @@ static inline void tpm_buf_append(struct tpm_buf *buf,
 				  const unsigned char *new_data,
 				  unsigned int new_len)
 {
-	struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
+	struct tpm_header *head = (struct tpm_header *) buf->data;
 	u32 len = tpm_buf_length(buf);
 
 	/* Return silently if overflow has already happened. */
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index 2bcf470c8e5d..ab03f8600f89 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -784,7 +784,7 @@ static int tpm2_do_selftest(struct tpm_chip *chip)
  */
 int tpm2_probe(struct tpm_chip *chip)
 {
-	struct tpm_output_header *out;
+	struct tpm_header *out;
 	struct tpm_buf buf;
 	int rc;
 
@@ -797,7 +797,7 @@ int tpm2_probe(struct tpm_chip *chip)
 	rc = tpm_transmit_cmd(chip, NULL, &buf, 0, 0, NULL);
 	/* We ignore TPM return codes on purpose. */
 	if (rc >=  0) {
-		out = (struct tpm_output_header *)buf.data;
+		out = (struct tpm_header *)buf.data;
 		if (be16_to_cpu(out->tag) == TPM2_ST_NO_SESSIONS)
 			chip->flags |= TPM_CHIP_FLAG_TPM2;
 	}
diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c
index 5ecc73988f7c..862ee1ce1755 100644
--- a/drivers/char/tpm/tpm2-space.c
+++ b/drivers/char/tpm/tpm2-space.c
@@ -334,7 +334,7 @@ static int tpm2_map_response_header(struct tpm_chip *chip, u32 cc, u8 *rsp,
 				    size_t len)
 {
 	struct tpm_space *space = &chip->work_space;
-	struct tpm_output_header *header = (void *)rsp;
+	struct tpm_header *header = (void *)rsp;
 	u32 phandle;
 	u32 phandle_type;
 	u32 vhandle;
@@ -394,7 +394,7 @@ static int tpm2_map_response_body(struct tpm_chip *chip, u32 cc, u8 *rsp,
 				  size_t len)
 {
 	struct tpm_space *space = &chip->work_space;
-	struct tpm_output_header *header = (void *)rsp;
+	struct tpm_header *header = (void *)rsp;
 	struct tpm2_cap_handles *data;
 	u32 phandle;
 	u32 phandle_type;
@@ -492,7 +492,7 @@ static int tpm2_save_space(struct tpm_chip *chip)
 int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space,
 		      u32 cc, u8 *buf, size_t *bufsiz)
 {
-	struct tpm_output_header *header = (void *)buf;
+	struct tpm_header *header = (void *)buf;
 	int rc;
 
 	if (!space)
diff --git a/drivers/char/tpm/tpm_i2c_atmel.c b/drivers/char/tpm/tpm_i2c_atmel.c
index 95ce2e9ccdc6..4720b2442ffe 100644
--- a/drivers/char/tpm/tpm_i2c_atmel.c
+++ b/drivers/char/tpm/tpm_i2c_atmel.c
@@ -46,7 +46,7 @@ struct priv_data {
 	/* This is the amount we read on the first try. 25 was chosen to fit a
 	 * fair number of read responses in the buffer so a 2nd retry can be
 	 * avoided in small message cases. */
-	u8 buffer[sizeof(struct tpm_output_header) + 25];
+	u8 buffer[sizeof(struct tpm_header) + 25];
 };
 
 static int i2c_atmel_send(struct tpm_chip *chip, u8 *buf, size_t len)
@@ -72,8 +72,7 @@ static int i2c_atmel_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 {
 	struct priv_data *priv = dev_get_drvdata(&chip->dev);
 	struct i2c_client *client = to_i2c_client(chip->dev.parent);
-	struct tpm_output_header *hdr =
-		(struct tpm_output_header *)priv->buffer;
+	struct tpm_header *hdr = (struct tpm_header *)priv->buffer;
 	u32 expected_len;
 	int rc;
 
diff --git a/drivers/char/tpm/tpm_vtpm_proxy.c b/drivers/char/tpm/tpm_vtpm_proxy.c
index 5f95fbfb7f6b..28eb5ab15b99 100644
--- a/drivers/char/tpm/tpm_vtpm_proxy.c
+++ b/drivers/char/tpm/tpm_vtpm_proxy.c
@@ -303,9 +303,9 @@ static int vtpm_proxy_tpm_op_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 static int vtpm_proxy_is_driver_command(struct tpm_chip *chip,
 					u8 *buf, size_t count)
 {
-	struct tpm_input_header *hdr = (struct tpm_input_header *)buf;
+	struct tpm_header *hdr = (struct tpm_header *)buf;
 
-	if (count < sizeof(struct tpm_input_header))
+	if (count < sizeof(struct tpm_header))
 		return 0;
 
 	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
@@ -402,7 +402,7 @@ static int vtpm_proxy_request_locality(struct tpm_chip *chip, int locality)
 {
 	struct tpm_buf buf;
 	int rc;
-	const struct tpm_output_header *header;
+	const struct tpm_header *header;
 	struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev);
 
 	if (chip->flags & TPM_CHIP_FLAG_TPM2)
@@ -427,7 +427,7 @@ static int vtpm_proxy_request_locality(struct tpm_chip *chip, int locality)
 		goto out;
 	}
 
-	header = (const struct tpm_output_header *)buf.data;
+	header = (const struct tpm_header *)buf.data;
 	rc = be32_to_cpu(header->return_code);
 	if (rc)
 		locality = -1;
diff --git a/drivers/char/tpm/xen-tpmfront.c b/drivers/char/tpm/xen-tpmfront.c
index b150f87f38f5..1259e935fd58 100644
--- a/drivers/char/tpm/xen-tpmfront.c
+++ b/drivers/char/tpm/xen-tpmfront.c
@@ -163,7 +163,7 @@ static int vtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
 	wmb();
 	notify_remote_via_evtchn(priv->evtchn);
 
-	ordinal = be32_to_cpu(((struct tpm_input_header*)buf)->ordinal);
+	ordinal = be32_to_cpu(((struct tpm_header *)buf)->ordinal);
 	duration = tpm_calc_ordinal_duration(chip, ordinal);
 
 	if (wait_for_tpm_stat(chip, VTPM_STATUS_IDLE, duration,
-- 
2.19.1

[PATCH v9 00/17] Removed nested TPM operations

[Stefan Berger]

On 11/18/18 7:47 AM, Jarkko Sakkinen wrote:
> [was Detach TPM space code out of the tpm_transmit() flow but the scope
>   expanded a bit.]
>
> Make the changes necessary to detach TPM space code and TPM activation
> code out of the tpm_transmit() flow because of both of these can cause
> nested tpm_transmit() calls. The nesteds calls make the whole flow hard
> to maintain, and thus, it is better to just fix things now before this
> turns into a bigger mess.

Tested this series with the vtpm proxy test cases:


Tested-by: Stefan Berger <stefanb@linux.ibm.com>


>
> v9:
> * Fixed again tpm_try_get_ops().
> * Added missing reviewed-by's.
>
> v8:
> * Re-add the check for ret < 0 after calling tpm_try_transmit() that
>    was dropped by mistake while moving code.
> * Fix error fallback for tpm_try_get_ops() when tpm_chip_start()
>    fails.
>
> v7:
> *  Reorganize series so that more trivial and self-contained changes are
>     in the head.
>
> v6:
> * When tpm_validate_commmand() was moved to tpm2-space.c, the struct for
>    the TPM header was incorrectly declared as struct tpm_input_header.
> * Fix return value in tpm_validate_command().
>
> v5:
> * Add the missing rev's from Stefan Berger.
>
> v4:
> * Return 0 from pcrs_show() when tpm1_pcr_read() fails.
> * Fix error handling flow in tpm_try_transmit().
> * Replace struct tpm_input_header and struct tpm_output_header with
>    struct tpm_header.
>
> v3:
> * Encapsulate power gating code to tpm_chip_start() and tpm_chip_stop().
> * Move TPM power gating code and locking to tpm_try_get_ops() and
>    tpm_put_ops().
> * Call power gating code directly in tpm_chip_register() and
>    tpm2_del_space().
>
> v2:
> * Print tpm2_commit_space() error inside tpm2_commit_space()
> * Error code was not printed when recv() callback failed. It is
>    fixed in this version.
> * Added a patch that removes @space from tpm_transmit().
> * Fixed a regression in earlier series. Forgot to amend the change
>    from the staging area that renames NESTED to UNLOCKED in tpm2-space.c.
>
> Jarkko Sakkinen (17):
>    tpm: use tpm_buf in tpm_transmit_cmd() as the IO parameter
>    tpm: fix invalid return value in pubek_show()
>    tpm: return 0 from pcrs_show() when tpm1_pcr_read() fails
>    tpm: print tpm2_commit_space() error inside tpm2_commit_space()
>    tpm: declare struct tpm_header
>    tpm: access command header through struct in tpm_try_transmit()
>    tpm: encapsulate tpm_dev_transmit()
>    tpm: call tpm2_flush_space() on error in tpm_try_transmit()
>    tpm: clean up tpm_try_transmit() error handling flow
>    tpm: move tpm_validate_commmand() to tpm2-space.c
>    tpm: move TPM space code out of tpm_transmit()
>    tpm: remove @space from tpm_transmit()
>    tpm: use tpm_try_get_ops() in tpm-sysfs.c.
>    tpm: remove TPM_TRANSMIT_UNLOCKED flag
>    tpm: introduce tpm_chip_start() and tpm_chip_stop()
>    tpm: take TPM chip power gating out of tpm_transmit()
>    tpm: remove @flags from tpm_transmit()
>
>   drivers/char/tpm/tpm-chip.c       | 109 ++++++++++++
>   drivers/char/tpm/tpm-dev-common.c |  45 ++++-
>   drivers/char/tpm/tpm-interface.c  | 264 ++++++------------------------
>   drivers/char/tpm/tpm-sysfs.c      | 138 ++++++++++------
>   drivers/char/tpm/tpm.h            |  64 +++-----
>   drivers/char/tpm/tpm1-cmd.c       |  28 +---
>   drivers/char/tpm/tpm2-cmd.c       |  72 +++-----
>   drivers/char/tpm/tpm2-space.c     |  93 ++++++++---
>   drivers/char/tpm/tpm_i2c_atmel.c  |   5 +-
>   drivers/char/tpm/tpm_vtpm_proxy.c |  12 +-
>   drivers/char/tpm/xen-tpmfront.c   |   2 +-
>   11 files changed, 410 insertions(+), 422 deletions(-)
>

[PATCH v9 00/17] Removed nested TPM operations

[Jarkko Sakkinen]

On Mon, Nov 19, 2018 at 09:23:03AM -0500, Stefan Berger wrote:
> On 11/18/18 7:47 AM, Jarkko Sakkinen wrote:
> > [was Detach TPM space code out of the tpm_transmit() flow but the scope
> >   expanded a bit.]
> > 
> > Make the changes necessary to detach TPM space code and TPM activation
> > code out of the tpm_transmit() flow because of both of these can cause
> > nested tpm_transmit() calls. The nesteds calls make the whole flow hard
> > to maintain, and thus, it is better to just fix things now before this
> > turns into a bigger mess.
> 
> Tested this series with the vtpm proxy test cases:
> 
> 
> Tested-by: Stefan Berger <stefanb@linux.ibm.com>

Awesome, thank you! I'll add your tags to the next revision.

/Jarkko

[PATCH v9 05/17] tpm: declare struct tpm_header

[Winkler, Tomas]

> 
> Decleare struct tpm_header that replaces struct tpm_input_header and
Typo 
> struct tpm_output_header.
> 
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
> ---
>  drivers/char/tpm/tpm-interface.c  |  9 ++++-----
>  drivers/char/tpm/tpm.h            | 27 ++++++++++++---------------
>  drivers/char/tpm/tpm2-cmd.c       |  4 ++--
>  drivers/char/tpm/tpm2-space.c     |  6 +++---
>  drivers/char/tpm/tpm_i2c_atmel.c  |  5 ++---
> drivers/char/tpm/tpm_vtpm_proxy.c |  8 ++++----
>  drivers/char/tpm/xen-tpmfront.c   |  2 +-
>  7 files changed, 28 insertions(+), 33 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-
> interface.c
> index 7ac6ada8428c..cb0d44c158ae 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -67,7 +67,7 @@ static int tpm_validate_command(struct tpm_chip
> *chip,
>  				 const u8 *cmd,
>  				 size_t len)
>  {
> -	const struct tpm_input_header *header = (const void *)cmd;
> +	const struct tpm_header *header = (const void *)cmd;


Sometimes it is casted (void *), sometimes (struct tpm_header *)
Better to use one convention 

>  	int i;
>  	u32 cc;
>  	u32 attrs;
> @@ -166,7 +166,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip
> *chip,
>  				u8 *buf, size_t bufsiz,
>  				unsigned int flags)
>  {
> -	struct tpm_output_header *header = (void *)buf;
> +	struct tpm_header *header = (void *)buf;
>  	int rc;
>  	ssize_t len = 0;
>  	u32 count, ordinal;
> @@ -316,7 +316,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip
> *chip,  ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
>  		     u8 *buf, size_t bufsiz, unsigned int flags)  {
> -	struct tpm_output_header *header = (struct tpm_output_header
> *)buf;
> +	struct tpm_header *header = (struct tpm_header *)buf;
>  	/* space for header and handles */
>  	u8 save[TPM_HEADER_SIZE + 3*sizeof(u32)];
>  	unsigned int delay_msec = TPM2_DURATION_SHORT; @@ -381,8
> +381,7 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct
> tpm_space *space,
>  			 struct tpm_buf *buf, size_t min_rsp_body_length,
>  			 unsigned int flags, const char *desc)  {
> -	const struct tpm_output_header *header =
> -		(struct tpm_output_header *)buf->data;
> +	const struct tpm_header *header = (struct tpm_header *)buf->data;
>  	int err;
>  	ssize_t len;
> 
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index
> 49bca4d1e786..86fa8ac0ae20 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -273,16 +273,13 @@ struct tpm_chip {
> 
>  #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
> 
> -struct tpm_input_header {
> -	__be16	tag;
> -	__be32	length;
> -	__be32	ordinal;
> -} __packed;
> -
> -struct tpm_output_header {
> -	__be16	tag;
> -	__be32	length;
> -	__be32	return_code;
> +struct tpm_header {
Does it deserve kdoc? 
> +	__be16 tag;
> +	__be32 length;
> +	union {
> +		__be32 ordinal;
> +		__be32 return_code;
> +	};
>  } __packed;
> 
>  #define TPM_TAG_RQU_COMMAND 193
> @@ -401,8 +398,8 @@ struct tpm_buf {
> 
>  static inline void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal)  {
> -	struct tpm_input_header *head;
> -	head = (struct tpm_input_header *)buf->data;
> +	struct tpm_header *head = (struct tpm_header *)buf->data;
> +
>  	head->tag = cpu_to_be16(tag);
>  	head->length = cpu_to_be32(sizeof(*head));
>  	head->ordinal = cpu_to_be32(ordinal);
> @@ -428,14 +425,14 @@ static inline void tpm_buf_destroy(struct tpm_buf
> *buf)
> 
>  static inline u32 tpm_buf_length(struct tpm_buf *buf)  {
> -	struct tpm_input_header *head = (struct tpm_input_header *) buf-
> >data;
No blank after ) in casting. 

> +	struct tpm_header *head = (struct tpm_header *) buf->data;
> 
>  	return be32_to_cpu(head->length);
>  }
> 
>  static inline u16 tpm_buf_tag(struct tpm_buf *buf)  {
> -	struct tpm_input_header *head = (struct tpm_input_header *) buf-
> >data;
> +	struct tpm_header *head = (struct tpm_header *) buf->data;
> 
>  	return be16_to_cpu(head->tag);
>  }
> @@ -444,7 +441,7 @@ static inline void tpm_buf_append(struct tpm_buf
> *buf,
>  				  const unsigned char *new_data,
>  				  unsigned int new_len)
>  {
> -	struct tpm_input_header *head = (struct tpm_input_header *) buf-
> >data;
> +	struct tpm_header *head = (struct tpm_header *) buf->data;
No blank after ) in casting.
>  	u32 len = tpm_buf_length(buf);
> 
>  	/* Return silently if overflow has already happened. */ diff --git
> a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c index
> 2bcf470c8e5d..ab03f8600f89 100644
> --- a/drivers/char/tpm/tpm2-cmd.c
> +++ b/drivers/char/tpm/tpm2-cmd.c
> @@ -784,7 +784,7 @@ static int tpm2_do_selftest(struct tpm_chip *chip)
>   */
>  int tpm2_probe(struct tpm_chip *chip)
>  {
> -	struct tpm_output_header *out;
> +	struct tpm_header *out;
>  	struct tpm_buf buf;
>  	int rc;
> 
> @@ -797,7 +797,7 @@ int tpm2_probe(struct tpm_chip *chip)
>  	rc = tpm_transmit_cmd(chip, NULL, &buf, 0, 0, NULL);
>  	/* We ignore TPM return codes on purpose. */
>  	if (rc >=  0) {
> -		out = (struct tpm_output_header *)buf.data;
> +		out = (struct tpm_header *)buf.data;
>  		if (be16_to_cpu(out->tag) == TPM2_ST_NO_SESSIONS)
>  			chip->flags |= TPM_CHIP_FLAG_TPM2;
>  	}
> diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c
> index 5ecc73988f7c..862ee1ce1755 100644
> --- a/drivers/char/tpm/tpm2-space.c
> +++ b/drivers/char/tpm/tpm2-space.c
> @@ -334,7 +334,7 @@ static int tpm2_map_response_header(struct
> tpm_chip *chip, u32 cc, u8 *rsp,
>  				    size_t len)
>  {
>  	struct tpm_space *space = &chip->work_space;
> -	struct tpm_output_header *header = (void *)rsp;
> +	struct tpm_header *header = (void *)rsp;
>  	u32 phandle;
>  	u32 phandle_type;
>  	u32 vhandle;
> @@ -394,7 +394,7 @@ static int tpm2_map_response_body(struct tpm_chip
> *chip, u32 cc, u8 *rsp,
>  				  size_t len)
>  {
>  	struct tpm_space *space = &chip->work_space;
> -	struct tpm_output_header *header = (void *)rsp;
> +	struct tpm_header *header = (void *)rsp;
>  	struct tpm2_cap_handles *data;
>  	u32 phandle;
>  	u32 phandle_type;
> @@ -492,7 +492,7 @@ static int tpm2_save_space(struct tpm_chip *chip)
> int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space,
>  		      u32 cc, u8 *buf, size_t *bufsiz)  {
> -	struct tpm_output_header *header = (void *)buf;
> +	struct tpm_header *header = (void *)buf;
>  	int rc;
> 
>  	if (!space)
> diff --git a/drivers/char/tpm/tpm_i2c_atmel.c
> b/drivers/char/tpm/tpm_i2c_atmel.c
> index 95ce2e9ccdc6..4720b2442ffe 100644
> --- a/drivers/char/tpm/tpm_i2c_atmel.c
> +++ b/drivers/char/tpm/tpm_i2c_atmel.c
> @@ -46,7 +46,7 @@ struct priv_data {
>  	/* This is the amount we read on the first try. 25 was chosen to fit a
>  	 * fair number of read responses in the buffer so a 2nd retry can be
>  	 * avoided in small message cases. */
> -	u8 buffer[sizeof(struct tpm_output_header) + 25];
> +	u8 buffer[sizeof(struct tpm_header) + 25];
>  };
> 
>  static int i2c_atmel_send(struct tpm_chip *chip, u8 *buf, size_t len) @@ -
> 72,8 +72,7 @@ static int i2c_atmel_recv(struct tpm_chip *chip, u8 *buf,
> size_t count)  {
>  	struct priv_data *priv = dev_get_drvdata(&chip->dev);
>  	struct i2c_client *client = to_i2c_client(chip->dev.parent);
> -	struct tpm_output_header *hdr =
> -		(struct tpm_output_header *)priv->buffer;
> +	struct tpm_header *hdr = (struct tpm_header *)priv->buffer;
>  	u32 expected_len;
>  	int rc;
> 
> diff --git a/drivers/char/tpm/tpm_vtpm_proxy.c
> b/drivers/char/tpm/tpm_vtpm_proxy.c
> index 5f95fbfb7f6b..28eb5ab15b99 100644
> --- a/drivers/char/tpm/tpm_vtpm_proxy.c
> +++ b/drivers/char/tpm/tpm_vtpm_proxy.c
> @@ -303,9 +303,9 @@ static int vtpm_proxy_tpm_op_recv(struct tpm_chip
> *chip, u8 *buf, size_t count)  static int
> vtpm_proxy_is_driver_command(struct tpm_chip *chip,
>  					u8 *buf, size_t count)
>  {
> -	struct tpm_input_header *hdr = (struct tpm_input_header *)buf;
> +	struct tpm_header *hdr = (struct tpm_header *)buf;
> 
> -	if (count < sizeof(struct tpm_input_header))
> +	if (count < sizeof(struct tpm_header))
>  		return 0;
> 
>  	if (chip->flags & TPM_CHIP_FLAG_TPM2) { @@ -402,7 +402,7 @@
> static int vtpm_proxy_request_locality(struct tpm_chip *chip, int locality)  {
>  	struct tpm_buf buf;
>  	int rc;
> -	const struct tpm_output_header *header;
> +	const struct tpm_header *header;
>  	struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev);
> 
>  	if (chip->flags & TPM_CHIP_FLAG_TPM2)
> @@ -427,7 +427,7 @@ static int vtpm_proxy_request_locality(struct
> tpm_chip *chip, int locality)
>  		goto out;
>  	}
> 
> -	header = (const struct tpm_output_header *)buf.data;
> +	header = (const struct tpm_header *)buf.data;
>  	rc = be32_to_cpu(header->return_code);
>  	if (rc)
>  		locality = -1;
> diff --git a/drivers/char/tpm/xen-tpmfront.c b/drivers/char/tpm/xen-
> tpmfront.c index b150f87f38f5..1259e935fd58 100644
> --- a/drivers/char/tpm/xen-tpmfront.c
> +++ b/drivers/char/tpm/xen-tpmfront.c
> @@ -163,7 +163,7 @@ static int vtpm_send(struct tpm_chip *chip, u8 *buf,
> size_t count)
>  	wmb();
>  	notify_remote_via_evtchn(priv->evtchn);
> 
> -	ordinal = be32_to_cpu(((struct tpm_input_header*)buf)->ordinal);
> +	ordinal = be32_to_cpu(((struct tpm_header *)buf)->ordinal);
>  	duration = tpm_calc_ordinal_duration(chip, ordinal);
> 
>  	if (wait_for_tpm_stat(chip, VTPM_STATUS_IDLE, duration,
> --
> 2.19.1

[PATCH v9 05/17] tpm: declare struct tpm_header

[Jarkko Sakkinen]

On Mon, Nov 19, 2018 at 09:33:31PM +0000, Winkler, Tomas wrote:
> 
> > 
> > Decleare struct tpm_header that replaces struct tpm_input_header and
> Typo 

Thanks, will fix for the next version.

> > struct tpm_output_header.
> > 
> > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> > Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
> > ---
> >  drivers/char/tpm/tpm-interface.c  |  9 ++++-----
> >  drivers/char/tpm/tpm.h            | 27 ++++++++++++---------------
> >  drivers/char/tpm/tpm2-cmd.c       |  4 ++--
> >  drivers/char/tpm/tpm2-space.c     |  6 +++---
> >  drivers/char/tpm/tpm_i2c_atmel.c  |  5 ++---
> > drivers/char/tpm/tpm_vtpm_proxy.c |  8 ++++----
> >  drivers/char/tpm/xen-tpmfront.c   |  2 +-
> >  7 files changed, 28 insertions(+), 33 deletions(-)
> > 
> > diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-
> > interface.c
> > index 7ac6ada8428c..cb0d44c158ae 100644
> > --- a/drivers/char/tpm/tpm-interface.c
> > +++ b/drivers/char/tpm/tpm-interface.c
> > @@ -67,7 +67,7 @@ static int tpm_validate_command(struct tpm_chip
> > *chip,
> >  				 const u8 *cmd,
> >  				 size_t len)
> >  {
> > -	const struct tpm_input_header *header = (const void *)cmd;
> > +	const struct tpm_header *header = (const void *)cmd;
> 
> 
> Sometimes it is casted (void *), sometimes (struct tpm_header *)
> Better to use one convention 

I would prefer (const void *) because it is shorter form, and no
need to duplicate the type name two times, that way also more
readable. Anyway, agreed that we do have inconsistency with these.

> 
> >  	int i;
> >  	u32 cc;
> >  	u32 attrs;
> > @@ -166,7 +166,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip
> > *chip,
> >  				u8 *buf, size_t bufsiz,
> >  				unsigned int flags)
> >  {
> > -	struct tpm_output_header *header = (void *)buf;
> > +	struct tpm_header *header = (void *)buf;
> >  	int rc;
> >  	ssize_t len = 0;
> >  	u32 count, ordinal;
> > @@ -316,7 +316,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip
> > *chip,  ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
> >  		     u8 *buf, size_t bufsiz, unsigned int flags)  {
> > -	struct tpm_output_header *header = (struct tpm_output_header
> > *)buf;
> > +	struct tpm_header *header = (struct tpm_header *)buf;
> >  	/* space for header and handles */
> >  	u8 save[TPM_HEADER_SIZE + 3*sizeof(u32)];
> >  	unsigned int delay_msec = TPM2_DURATION_SHORT; @@ -381,8
> > +381,7 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct
> > tpm_space *space,
> >  			 struct tpm_buf *buf, size_t min_rsp_body_length,
> >  			 unsigned int flags, const char *desc)  {
> > -	const struct tpm_output_header *header =
> > -		(struct tpm_output_header *)buf->data;
> > +	const struct tpm_header *header = (struct tpm_header *)buf->data;
> >  	int err;
> >  	ssize_t len;
> > 
> > diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index
> > 49bca4d1e786..86fa8ac0ae20 100644
> > --- a/drivers/char/tpm/tpm.h
> > +++ b/drivers/char/tpm/tpm.h
> > @@ -273,16 +273,13 @@ struct tpm_chip {
> > 
> >  #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
> > 
> > -struct tpm_input_header {
> > -	__be16	tag;
> > -	__be32	length;
> > -	__be32	ordinal;
> > -} __packed;
> > -
> > -struct tpm_output_header {
> > -	__be16	tag;
> > -	__be32	length;
> > -	__be32	return_code;
> > +struct tpm_header {
> Does it deserve kdoc? 

Could be done if this is needed at some point in include/linux/tpm.h.
Do not see it right now as high priority.

> > +	__be16 tag;
> > +	__be32 length;
> > +	union {
> > +		__be32 ordinal;
> > +		__be32 return_code;
> > +	};
> >  } __packed;
> > 
> >  #define TPM_TAG_RQU_COMMAND 193
> > @@ -401,8 +398,8 @@ struct tpm_buf {
> > 
> >  static inline void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal)  {
> > -	struct tpm_input_header *head;
> > -	head = (struct tpm_input_header *)buf->data;
> > +	struct tpm_header *head = (struct tpm_header *)buf->data;
> > +
> >  	head->tag = cpu_to_be16(tag);
> >  	head->length = cpu_to_be32(sizeof(*head));
> >  	head->ordinal = cpu_to_be32(ordinal);
> > @@ -428,14 +425,14 @@ static inline void tpm_buf_destroy(struct tpm_buf
> > *buf)
> > 
> >  static inline u32 tpm_buf_length(struct tpm_buf *buf)  {
> > -	struct tpm_input_header *head = (struct tpm_input_header *) buf-
> > >data;
> No blank after ) in casting. 

And also here void casting would make sense.

> 
> > +	struct tpm_header *head = (struct tpm_header *) buf->data;
> > 
> >  	return be32_to_cpu(head->length);
> >  }
> > 
> >  static inline u16 tpm_buf_tag(struct tpm_buf *buf)  {
> > -	struct tpm_input_header *head = (struct tpm_input_header *) buf-
> > >data;
> > +	struct tpm_header *head = (struct tpm_header *) buf->data;
> > 
> >  	return be16_to_cpu(head->tag);
> >  }
> > @@ -444,7 +441,7 @@ static inline void tpm_buf_append(struct tpm_buf
> > *buf,
> >  				  const unsigned char *new_data,
> >  				  unsigned int new_len)
> >  {
> > -	struct tpm_input_header *head = (struct tpm_input_header *) buf-
> > >data;
> > +	struct tpm_header *head = (struct tpm_header *) buf->data;
> No blank after ) in casting.
> >  	u32 len = tpm_buf_length(buf);
> > 
> >  	/* Return silently if overflow has already happened. */ diff --git
> > a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c index
> > 2bcf470c8e5d..ab03f8600f89 100644
> > --- a/drivers/char/tpm/tpm2-cmd.c
> > +++ b/drivers/char/tpm/tpm2-cmd.c
> > @@ -784,7 +784,7 @@ static int tpm2_do_selftest(struct tpm_chip *chip)
> >   */
> >  int tpm2_probe(struct tpm_chip *chip)
> >  {
> > -	struct tpm_output_header *out;
> > +	struct tpm_header *out;
> >  	struct tpm_buf buf;
> >  	int rc;
> > 
> > @@ -797,7 +797,7 @@ int tpm2_probe(struct tpm_chip *chip)
> >  	rc = tpm_transmit_cmd(chip, NULL, &buf, 0, 0, NULL);
> >  	/* We ignore TPM return codes on purpose. */
> >  	if (rc >=  0) {
> > -		out = (struct tpm_output_header *)buf.data;
> > +		out = (struct tpm_header *)buf.data;
> >  		if (be16_to_cpu(out->tag) == TPM2_ST_NO_SESSIONS)
> >  			chip->flags |= TPM_CHIP_FLAG_TPM2;
> >  	}
> > diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c
> > index 5ecc73988f7c..862ee1ce1755 100644
> > --- a/drivers/char/tpm/tpm2-space.c
> > +++ b/drivers/char/tpm/tpm2-space.c
> > @@ -334,7 +334,7 @@ static int tpm2_map_response_header(struct
> > tpm_chip *chip, u32 cc, u8 *rsp,
> >  				    size_t len)
> >  {
> >  	struct tpm_space *space = &chip->work_space;
> > -	struct tpm_output_header *header = (void *)rsp;
> > +	struct tpm_header *header = (void *)rsp;
> >  	u32 phandle;
> >  	u32 phandle_type;
> >  	u32 vhandle;
> > @@ -394,7 +394,7 @@ static int tpm2_map_response_body(struct tpm_chip
> > *chip, u32 cc, u8 *rsp,
> >  				  size_t len)
> >  {
> >  	struct tpm_space *space = &chip->work_space;
> > -	struct tpm_output_header *header = (void *)rsp;
> > +	struct tpm_header *header = (void *)rsp;
> >  	struct tpm2_cap_handles *data;
> >  	u32 phandle;
> >  	u32 phandle_type;
> > @@ -492,7 +492,7 @@ static int tpm2_save_space(struct tpm_chip *chip)
> > int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space,
> >  		      u32 cc, u8 *buf, size_t *bufsiz)  {
> > -	struct tpm_output_header *header = (void *)buf;
> > +	struct tpm_header *header = (void *)buf;
> >  	int rc;
> > 
> >  	if (!space)
> > diff --git a/drivers/char/tpm/tpm_i2c_atmel.c
> > b/drivers/char/tpm/tpm_i2c_atmel.c
> > index 95ce2e9ccdc6..4720b2442ffe 100644
> > --- a/drivers/char/tpm/tpm_i2c_atmel.c
> > +++ b/drivers/char/tpm/tpm_i2c_atmel.c
> > @@ -46,7 +46,7 @@ struct priv_data {
> >  	/* This is the amount we read on the first try. 25 was chosen to fit a
> >  	 * fair number of read responses in the buffer so a 2nd retry can be
> >  	 * avoided in small message cases. */
> > -	u8 buffer[sizeof(struct tpm_output_header) + 25];
> > +	u8 buffer[sizeof(struct tpm_header) + 25];
> >  };
> > 
> >  static int i2c_atmel_send(struct tpm_chip *chip, u8 *buf, size_t len) @@ -
> > 72,8 +72,7 @@ static int i2c_atmel_recv(struct tpm_chip *chip, u8 *buf,
> > size_t count)  {
> >  	struct priv_data *priv = dev_get_drvdata(&chip->dev);
> >  	struct i2c_client *client = to_i2c_client(chip->dev.parent);
> > -	struct tpm_output_header *hdr =
> > -		(struct tpm_output_header *)priv->buffer;
> > +	struct tpm_header *hdr = (struct tpm_header *)priv->buffer;
> >  	u32 expected_len;
> >  	int rc;
> > 
> > diff --git a/drivers/char/tpm/tpm_vtpm_proxy.c
> > b/drivers/char/tpm/tpm_vtpm_proxy.c
> > index 5f95fbfb7f6b..28eb5ab15b99 100644
> > --- a/drivers/char/tpm/tpm_vtpm_proxy.c
> > +++ b/drivers/char/tpm/tpm_vtpm_proxy.c
> > @@ -303,9 +303,9 @@ static int vtpm_proxy_tpm_op_recv(struct tpm_chip
> > *chip, u8 *buf, size_t count)  static int
> > vtpm_proxy_is_driver_command(struct tpm_chip *chip,
> >  					u8 *buf, size_t count)
> >  {
> > -	struct tpm_input_header *hdr = (struct tpm_input_header *)buf;
> > +	struct tpm_header *hdr = (struct tpm_header *)buf;
> > 
> > -	if (count < sizeof(struct tpm_input_header))
> > +	if (count < sizeof(struct tpm_header))
> >  		return 0;
> > 
> >  	if (chip->flags & TPM_CHIP_FLAG_TPM2) { @@ -402,7 +402,7 @@
> > static int vtpm_proxy_request_locality(struct tpm_chip *chip, int locality)  {
> >  	struct tpm_buf buf;
> >  	int rc;
> > -	const struct tpm_output_header *header;
> > +	const struct tpm_header *header;
> >  	struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev);
> > 
> >  	if (chip->flags & TPM_CHIP_FLAG_TPM2)
> > @@ -427,7 +427,7 @@ static int vtpm_proxy_request_locality(struct
> > tpm_chip *chip, int locality)
> >  		goto out;
> >  	}
> > 
> > -	header = (const struct tpm_output_header *)buf.data;
> > +	header = (const struct tpm_header *)buf.data;
> >  	rc = be32_to_cpu(header->return_code);
> >  	if (rc)
> >  		locality = -1;
> > diff --git a/drivers/char/tpm/xen-tpmfront.c b/drivers/char/tpm/xen-
> > tpmfront.c index b150f87f38f5..1259e935fd58 100644
> > --- a/drivers/char/tpm/xen-tpmfront.c
> > +++ b/drivers/char/tpm/xen-tpmfront.c
> > @@ -163,7 +163,7 @@ static int vtpm_send(struct tpm_chip *chip, u8 *buf,
> > size_t count)
> >  	wmb();
> >  	notify_remote_via_evtchn(priv->evtchn);
> > 
> > -	ordinal = be32_to_cpu(((struct tpm_input_header*)buf)->ordinal);
> > +	ordinal = be32_to_cpu(((struct tpm_header *)buf)->ordinal);
> >  	duration = tpm_calc_ordinal_duration(chip, ordinal);
> > 
> >  	if (wait_for_tpm_stat(chip, VTPM_STATUS_IDLE, duration,
> > --
> > 2.19.1
> 

Thank you. Really useful feedback.

/Jarkko

[PATCH v9 05/17] tpm: declare struct tpm_header

[Jason Gunthorpe]

On Tue, Nov 20, 2018 at 03:08:05PM +0200, Jarkko Sakkinen wrote:
> On Mon, Nov 19, 2018 at 09:33:31PM +0000, Winkler, Tomas wrote:
> > 
> > > 
> > > Decleare struct tpm_header that replaces struct tpm_input_header and
> > Typo 
> 
> Thanks, will fix for the next version.
> 
> > > struct tpm_output_header.
> > > 
> > > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> > > Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
> > >  drivers/char/tpm/tpm-interface.c  |  9 ++++-----
> > >  drivers/char/tpm/tpm.h            | 27 ++++++++++++---------------
> > >  drivers/char/tpm/tpm2-cmd.c       |  4 ++--
> > >  drivers/char/tpm/tpm2-space.c     |  6 +++---
> > >  drivers/char/tpm/tpm_i2c_atmel.c  |  5 ++---
> > > drivers/char/tpm/tpm_vtpm_proxy.c |  8 ++++----
> > >  drivers/char/tpm/xen-tpmfront.c   |  2 +-
> > >  7 files changed, 28 insertions(+), 33 deletions(-)
> > > 
> > > diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-
> > > interface.c
> > > index 7ac6ada8428c..cb0d44c158ae 100644
> > > +++ b/drivers/char/tpm/tpm-interface.c
> > > @@ -67,7 +67,7 @@ static int tpm_validate_command(struct tpm_chip
> > > *chip,
> > >  				 const u8 *cmd,
> > >  				 size_t len)
> > >  {
> > > -	const struct tpm_input_header *header = (const void *)cmd;
> > > +	const struct tpm_header *header = (const void *)cmd;
> > 
> > 
> > Sometimes it is casted (void *), sometimes (struct tpm_header *)
> > Better to use one convention 
> 
> I would prefer (const void *) because it is shorter form, and no
> need to duplicate the type name two times, that way also more
> readable. Anyway, agreed that we do have inconsistency with these.

It is better to pass in 'const void *cmd' than to explicitly cast like
this.

I generally discourage casts to voids to save typing, just creates
confusion what is going on. Better to try to avoid casts by
constructing the code properly.

Jason

[PATCH v9 05/17] tpm: declare struct tpm_header

[Jarkko Sakkinen]

On Tue, Nov 20, 2018 at 09:01:11AM -0700, Jason Gunthorpe wrote:
> On Tue, Nov 20, 2018 at 03:08:05PM +0200, Jarkko Sakkinen wrote:
> > On Mon, Nov 19, 2018 at 09:33:31PM +0000, Winkler, Tomas wrote:
> > > 
> > > > 
> > > > Decleare struct tpm_header that replaces struct tpm_input_header and
> > > Typo 
> > 
> > Thanks, will fix for the next version.
> > 
> > > > struct tpm_output_header.
> > > > 
> > > > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> > > > Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
> > > >  drivers/char/tpm/tpm-interface.c  |  9 ++++-----
> > > >  drivers/char/tpm/tpm.h            | 27 ++++++++++++---------------
> > > >  drivers/char/tpm/tpm2-cmd.c       |  4 ++--
> > > >  drivers/char/tpm/tpm2-space.c     |  6 +++---
> > > >  drivers/char/tpm/tpm_i2c_atmel.c  |  5 ++---
> > > > drivers/char/tpm/tpm_vtpm_proxy.c |  8 ++++----
> > > >  drivers/char/tpm/xen-tpmfront.c   |  2 +-
> > > >  7 files changed, 28 insertions(+), 33 deletions(-)
> > > > 
> > > > diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-
> > > > interface.c
> > > > index 7ac6ada8428c..cb0d44c158ae 100644
> > > > +++ b/drivers/char/tpm/tpm-interface.c
> > > > @@ -67,7 +67,7 @@ static int tpm_validate_command(struct tpm_chip
> > > > *chip,
> > > >  				 const u8 *cmd,
> > > >  				 size_t len)
> > > >  {
> > > > -	const struct tpm_input_header *header = (const void *)cmd;
> > > > +	const struct tpm_header *header = (const void *)cmd;
> > > 
> > > 
> > > Sometimes it is casted (void *), sometimes (struct tpm_header *)
> > > Better to use one convention 
> > 
> > I would prefer (const void *) because it is shorter form, and no
> > need to duplicate the type name two times, that way also more
> > readable. Anyway, agreed that we do have inconsistency with these.
> 
> It is better to pass in 'const void *cmd' than to explicitly cast like
> this.
> 
> I generally discourage casts to voids to save typing, just creates
> confusion what is going on. Better to try to avoid casts by
> constructing the code properly.

Definitely. Will change in the next version.

/Jarkko

[PATCH v9 00/17] Removed nested TPM operations

[Jarkko Sakkinen]

On Sun, Nov 18, 2018 at 02:47:33PM +0200, Jarkko Sakkinen wrote:
> [was Detach TPM space code out of the tpm_transmit() flow but the scope
>  expanded a bit.]
> 
> Make the changes necessary to detach TPM space code and TPM activation
> code out of the tpm_transmit() flow because of both of these can cause
> nested tpm_transmit() calls. The nesteds calls make the whole flow hard
> to maintain, and thus, it is better to just fix things now before this
> turns into a bigger mess.

I will take care to address the feedback from Tomas and Jason but won't
yet try to push this into v4.21. It is a patch set, which is better to
lie in linux-next before landing to a release. Probably will push the
patches soon after my v4.21 PR to linux-next. Then they will get maximum
time of exposure.

/Jarkko