Re: [PATCH 4/4] tpm: Move TPM common base definitions to the command header

[Jarkko Sakkinen]

On Tue, Mar 17, 2026 at 04:03:35PM +0000, Alec Brown wrote:
> From: Ross Philipson <ross.philipson@xxxxxxxxxx>
> 
> From: Ross Philipson <ross.philipson@xxxxxxxxxx>
> 
> These are top level definitions shared by both TPM 1 and 2
> family chips. This includes core definitions like TPM localities,
> common crypto algorithm IDs, and the base TPM command header.
> 
> Signed-off-by: Daniel P. Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Ross Philipson <ross.philipson@xxxxxxxxxx>
> Signed-off-by: Alec Brown <alec.r.brown@xxxxxxxxxx>
> ---
>  include/linux/tpm.h         | 50 +--------------------
>  include/linux/tpm_command.h | 89 +++++++++++++++++++++++++++++++++++++
>  2 files changed, 90 insertions(+), 49 deletions(-)
> 
> diff --git a/include/linux/tpm.h b/include/linux/tpm.h
> index 92957452f7a7..a282b7045a24 100644
> --- a/include/linux/tpm.h
> +++ b/include/linux/tpm.h
> @@ -27,49 +27,12 @@
>  
>  #include "tpm_command.h"
>  
> -#define TPM_DIGEST_SIZE 20	/* Max TPM v1.2 PCR size */
> -
> -#define TPM2_MAX_DIGEST_SIZE	SHA512_DIGEST_SIZE
> -#define TPM2_MAX_PCR_BANKS	8
> -
>  struct tpm_chip;
>  struct trusted_key_payload;
>  struct trusted_key_options;
>  /* opaque structure, holds auth session parameters like the session key */
>  struct tpm2_auth;
>  
> -/* if you add a new hash to this, increment TPM_MAX_HASHES below */
> -enum tpm_algorithms {
> -	TPM_ALG_ERROR		= 0x0000,
> -	TPM_ALG_SHA1		= 0x0004,
> -	TPM_ALG_AES		= 0x0006,
> -	TPM_ALG_KEYEDHASH	= 0x0008,
> -	TPM_ALG_SHA256		= 0x000B,
> -	TPM_ALG_SHA384		= 0x000C,
> -	TPM_ALG_SHA512		= 0x000D,
> -	TPM_ALG_NULL		= 0x0010,
> -	TPM_ALG_SM3_256		= 0x0012,
> -	TPM_ALG_ECC		= 0x0023,
> -	TPM_ALG_CFB		= 0x0043,
> -};
> -
> -/*
> - * maximum number of hashing algorithms a TPM can have.  This is
> - * basically a count of every hash in tpm_algorithms above
> - */
> -#define TPM_MAX_HASHES	5
> -
> -struct tpm_digest {
> -	u16 alg_id;
> -	u8 digest[TPM2_MAX_DIGEST_SIZE];
> -} __packed;
> -
> -struct tpm_bank_info {
> -	u16 alg_id;
> -	u16 digest_size;
> -	u16 crypto_id;
> -};
> -
>  enum TPM_OPS_FLAGS {
>  	TPM_OPS_AUTO_STARTUP = BIT(0),
>  };
> @@ -127,7 +90,7 @@ struct tpm_chip_seqops {
>  	const struct seq_operations *seqops;
>  };
>  
> -/* fixed define for the curve we use which is NIST_P256 */
> +/* Fixed define for the curve we use which is NIST_P256 */
>  #define EC_PT_SZ	32
>  
>  /*
> @@ -209,8 +172,6 @@ struct tpm_chip {
>  #endif
>  };
>  
> -#define TPM_HEADER_SIZE		10
> -
>  static inline enum tpm2_mso_type tpm2_handle_mso(u32 handle)
>  {
>  	return handle >> 24;
> @@ -239,15 +200,6 @@ enum tpm_chip_flags {
>  
>  #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
>  
> -struct tpm_header {
> -	__be16 tag;
> -	__be32 length;
> -	union {
> -		__be32 ordinal;
> -		__be32 return_code;
> -	};
> -} __packed;
> -
>  enum tpm_buf_flags {
>  	/* the capacity exceeded: */
>  	TPM_BUF_OVERFLOW	= BIT(0),
> diff --git a/include/linux/tpm_command.h b/include/linux/tpm_command.h
> index ee76fcd5ecef..25a247254140 100644
> --- a/include/linux/tpm_command.h
> +++ b/include/linux/tpm_command.h
> @@ -431,4 +431,93 @@ struct tpm2_context {
>  	__be16 blob_size;
>  } __packed;
>  
> +/************************************************/
> +/* TPM Common Defs                              */
> +/************************************************/
> +
> +#define TPM_DIGEST_SIZE		20	/* Max TPM v1.2 PCR size */
> +#define TPM_BUFSIZE		4096
> +
> +/*
> + * SHA-512 is, as of today, the largest digest in the TCG algorithm repository.
> + */
> +#define TPM2_MAX_DIGEST_SIZE	SHA512_DIGEST_SIZE
> +
> +/*
> + * A TPM name digest i.e., TPMT_HA, is a concatenation of TPM_ALG_ID of the
> + * name algorithm and hash of TPMT_PUBLIC.
> + */
> +#define TPM2_MAX_NAME_SIZE	(TPM2_MAX_DIGEST_SIZE + 2)
> +
> +/*
> + * Fixed define for the size of a name.  This is actually HASHALG size
> + * plus 2, so 32 for SHA256
> + */
> +#define TPM2_NULL_NAME_SIZE	34
> +
> +/*
> + * The maximum number of PCR banks.
> + */
> +#define TPM2_MAX_PCR_BANKS	8
> +
> +/* If you add a new hash to this, increment TPM_MAX_HASHES below */
> +enum tpm_algorithms {
> +	TPM_ALG_ERROR		= 0x0000,
> +	TPM_ALG_SHA1		= 0x0004,
> +	TPM_ALG_AES		= 0x0006,
> +	TPM_ALG_KEYEDHASH	= 0x0008,
> +	TPM_ALG_SHA256		= 0x000B,
> +	TPM_ALG_SHA384		= 0x000C,
> +	TPM_ALG_SHA512		= 0x000D,
> +	TPM_ALG_NULL		= 0x0010,
> +	TPM_ALG_SM3_256		= 0x0012,
> +	TPM_ALG_ECC		= 0x0023,
> +	TPM_ALG_CFB		= 0x0043,
> +};
> +
> +/*
> + * The locality (0 - 4) for a TPM, as defined in section 3.2 of the
> + * Client Platform Profile Specification.
> + */
> +enum tpm_localities {
> +	TPM_LOCALITY_0		= 0, /* Static RTM */
> +	TPM_LOCALITY_1		= 1, /* Dynamic OS */
> +	TPM_LOCALITY_2		= 2, /* DRTM Environment */
> +	TPM_LOCALITY_3		= 3, /* Aux Components */
> +	TPM_LOCALITY_4		= 4, /* CPU DRTM Establishment */
> +	TPM_MAX_LOCALITY	= TPM_LOCALITY_4
> +};
> +
> +/*
> + * Structure to represent active PCR algorithm banks usable by the
> + * TPM chip.
> + */
> +struct tpm_bank_info {
> +	u16 alg_id;
> +	u16 digest_size;
> +	u16 crypto_id;
> +};
> +
> +/*
> + * Maximum number of hashing algorithms a TPM can have.  This is
> + * basically a count of every hash in tpm_algorithms above
> + */
> +#define TPM_MAX_HASHES		5
> +
> +struct tpm_digest {
> +	u16 alg_id;
> +	u8 digest[TPM2_MAX_DIGEST_SIZE];
> +} __packed;
> +
> +#define TPM_HEADER_SIZE		10
> +
> +struct tpm_header {
> +	__be16 tag;
> +	__be32 length;
> +	union {
> +		__be32 ordinal;
> +		__be32 return_code;
> +	};
> +} __packed;
> +
>  #endif
> -- 
> 2.47.3
> 

Yep, all looks great and clean to me but exactly for that reason
this needs to the truth serum :-)

BR, Jarkko