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Message-ID: <aW7D2ZQZmoXF0L2p@kernel.org>
Date: Tue, 20 Jan 2026 01:52:57 +0200
From: Jarkko Sakkinen <jarkko@...nel.org>
To: Ross Philipson <ross.philipson@...cle.com>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org,
linux-integrity@...r.kernel.org, linux-doc@...r.kernel.org,
linux-crypto@...r.kernel.org, kexec@...ts.infradead.org,
linux-efi@...r.kernel.org, iommu@...ts.linux.dev,
dpsmith@...rtussolutions.com, tglx@...utronix.de, mingo@...hat.com,
bp@...en8.de, hpa@...or.com, dave.hansen@...ux.intel.com,
ardb@...nel.org, mjg59@...f.ucam.org,
James.Bottomley@...senpartnership.com, peterhuewe@....de,
jgg@...pe.ca, luto@...capital.net, nivedita@...m.mit.edu,
herbert@...dor.apana.org.au, davem@...emloft.net, corbet@....net,
ebiederm@...ssion.com, dwmw2@...radead.org,
baolu.lu@...ux.intel.com, kanth.ghatraju@...cle.com,
andrew.cooper3@...rix.com, trenchboot-devel@...glegroups.com
Subject: Re: [PATCH v15 01/28] tpm: Initial step to reorganize TPM public
headers
On Tue, Jan 20, 2026 at 01:40:49AM +0200, Jarkko Sakkinen wrote:
> On Mon, Dec 15, 2025 at 03:32:49PM -0800, Ross Philipson wrote:
> > Replace the existing public header tpm_command.h with the first two
> > new public headers tpm1.h and tpm_common.h. In addition, related
> > definitions in tpm1_cmd.c were moved to the new tpm1.h.
> >
> > Signed-off-by: Daniel P. Smith <dpsmith@...rtussolutions.com>
> > Signed-off-by: Ross Philipson <ross.philipson@...cle.com>
> > ---
> > drivers/char/tpm/tpm-buf.c | 3 +-
> > drivers/char/tpm/tpm1-cmd.c | 13 +-----
> > include/keys/trusted_tpm.h | 1 -
> > include/linux/tpm.h | 3 ++
> > include/linux/tpm1.h | 55 +++++++++++++++++++++++
> > include/linux/tpm_command.h | 30 -------------
>
> Removing tpm_command.h causes unnecessary noise.
>
> It would be better to retain tpm_command.h, and simply supplement
> it with TPM2 constants.
>
> Also, what is the reason to not have both TPM1 and TPM2 in tpm.h?
>
> To put the question in other words: is there something in tpm.h that
> would be incompatible with early boot code?
>
> I'd rather tweak that than have more files...
>
> > include/linux/tpm_common.h | 22 +++++++++
> > security/keys/trusted-keys/trusted_tpm1.c | 1 -
> > security/keys/trusted-keys/trusted_tpm2.c | 1 -
> > 9 files changed, 82 insertions(+), 47 deletions(-)
> > create mode 100644 include/linux/tpm1.h
> > delete mode 100644 include/linux/tpm_command.h
> > create mode 100644 include/linux/tpm_common.h
> >
> > diff --git a/drivers/char/tpm/tpm-buf.c b/drivers/char/tpm/tpm-buf.c
> > index 1cb649938c01..dae23e6de269 100644
> > --- a/drivers/char/tpm/tpm-buf.c
> > +++ b/drivers/char/tpm/tpm-buf.c
> > @@ -3,7 +3,6 @@
> > * Handling of TPM command and other buffers.
> > */
> >
> > -#include <linux/tpm_command.h>
> > #include <linux/module.h>
> > #include <linux/tpm.h>
> >
> > @@ -296,7 +295,7 @@ void tpm1_buf_append_extend(struct tpm_buf *buf, u32 pcr_idx, const u8 *hash)
> > if (buf->flags & TPM_BUF_INVALID)
> > return;
> >
> > - if (!tpm1_buf_is_command(buf, TPM_ORD_EXTEND)) {
> > + if (!tpm1_buf_is_command(buf, TPM_ORD_PCR_EXTEND)) {
> > WARN(1, "tpm_buf: invalid TPM_Extend command\n");
> > buf->flags |= TPM_BUF_INVALID;
> > return;
> > diff --git a/drivers/char/tpm/tpm1-cmd.c b/drivers/char/tpm/tpm1-cmd.c
> > index bc156d7d59f2..f29827b454d2 100644
> > --- a/drivers/char/tpm/tpm1-cmd.c
> > +++ b/drivers/char/tpm/tpm1-cmd.c
> > @@ -18,12 +18,9 @@
> > #include <linux/mutex.h>
> > #include <linux/spinlock.h>
> > #include <linux/freezer.h>
> > -#include <linux/tpm_command.h>
> > #include <linux/tpm_eventlog.h>
> > #include "tpm.h"
> >
> > -#define TPM_MAX_ORDINAL 243
> > -
> > /*
> > * Array with one entry per ordinal defining the maximum amount
> > * of time the chip could take to return the result. The ordinal
> > @@ -308,9 +305,6 @@ unsigned long tpm1_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
> > return duration;
> > }
> >
> > -#define TPM_ORD_STARTUP 153
> > -#define TPM_ST_CLEAR 1
> > -
> > /**
> > * tpm1_startup() - turn on the TPM
> > * @chip: TPM chip to use
> > @@ -478,7 +472,6 @@ int tpm1_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, const u8 *hash,
> > return rc;
> > }
> >
> > -#define TPM_ORD_GET_CAP 101
> > ssize_t tpm1_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
> > const char *desc, size_t min_cap_length)
> > {
> > @@ -574,7 +567,6 @@ int tpm1_get_random(struct tpm_chip *chip, u8 *dest, size_t max)
> > return rc;
> > }
> >
> > -#define TPM_ORD_PCRREAD 21
> > int tpm1_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf)
> > {
> > int rc;
> > @@ -584,7 +576,7 @@ int tpm1_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf)
> > return -ENOMEM;
> >
> > tpm_buf_init(buf, TPM_BUFSIZE);
> > - tpm_buf_reset(buf, TPM_TAG_RQU_COMMAND, TPM_ORD_PCRREAD);
> > + tpm_buf_reset(buf, TPM_TAG_RQU_COMMAND, TPM_ORD_PCR_READ);
> > tpm_buf_append_u32(buf, pcr_idx);
> >
> > rc = tpm_transmit_cmd(chip, buf, TPM_DIGEST_SIZE,
> > @@ -599,7 +591,6 @@ int tpm1_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf)
> > return rc;
> > }
> >
> > -#define TPM_ORD_CONTINUE_SELFTEST 83
> > /**
> > * tpm1_continue_selftest() - run TPM's selftest
> > * @chip: TPM chip to use
> > @@ -716,8 +707,6 @@ int tpm1_auto_startup(struct tpm_chip *chip)
> > return rc;
> > }
> >
> > -#define TPM_ORD_SAVESTATE 152
> > -
> > /**
> > * tpm1_pm_suspend() - pm suspend handler
> > * @chip: TPM chip to use.
> > diff --git a/include/keys/trusted_tpm.h b/include/keys/trusted_tpm.h
> > index 0fadc6a4f166..3a0fa3bc8454 100644
> > --- a/include/keys/trusted_tpm.h
> > +++ b/include/keys/trusted_tpm.h
> > @@ -3,7 +3,6 @@
> > #define __TRUSTED_TPM_H
> >
> > #include <keys/trusted-type.h>
> > -#include <linux/tpm_command.h>
> >
> > extern struct trusted_key_ops trusted_key_tpm_ops;
> >
> > diff --git a/include/linux/tpm.h b/include/linux/tpm.h
> > index 8da49e8769d5..ef81e0b59657 100644
> > --- a/include/linux/tpm.h
> > +++ b/include/linux/tpm.h
> > @@ -25,6 +25,9 @@
> > #include <crypto/hash_info.h>
> > #include <crypto/aes.h>
> >
> > +#include "tpm_common.h"
> > +#include "tpm1.h"
> > +
> > #define TPM_DIGEST_SIZE 20 /* Max TPM v1.2 PCR size */
> > #define TPM_HEADER_SIZE 10
> > #define TPM_BUFSIZE 4096
> > diff --git a/include/linux/tpm1.h b/include/linux/tpm1.h
> > new file mode 100644
> > index 000000000000..54c6c211eb9e
> > --- /dev/null
> > +++ b/include/linux/tpm1.h
> > @@ -0,0 +1,55 @@
> > +/* SPDX-License-Identifier: GPL-2.0-only */
> > +/*
> > + * Copyright (C) 2004,2007,2008 IBM Corporation
> > + *
> > + * Authors:
> > + * Leendert van Doorn <leendert@...son.ibm.com>
> > + * Dave Safford <safford@...son.ibm.com>
> > + * Reiner Sailer <sailer@...son.ibm.com>
> > + * Kylene Hall <kjhall@...ibm.com>
> > + * Debora Velarde <dvelarde@...ibm.com>
> > + *
> > + * Maintained by: <tpmdd_devel@...ts.sourceforge.net>
> > + *
> > + * Device driver for TCG/TCPA TPM (trusted platform module).
> > + * Specifications at www.trustedcomputinggroup.org
> > + */
> > +#ifndef __LINUX_TPM1_H__
> > +#define __LINUX_TPM1_H__
> > +
> > +/*
> > + * TPM 1.2 Main Specification
> > + * https://trustedcomputinggroup.org/resource/tpm-main-specification/
> > + */
> > +
> > +/* Command TAGS */
> > +enum tpm_command_tags {
> > + TPM_TAG_RQU_COMMAND = 193,
> > + TPM_TAG_RQU_AUTH1_COMMAND = 194,
> > + TPM_TAG_RQU_AUTH2_COMMAND = 195,
> > + TPM_TAG_RSP_COMMAND = 196,
> > + TPM_TAG_RSP_AUTH1_COMMAND = 197,
> > + TPM_TAG_RSP_AUTH2_COMMAND = 198,
> > +};
> > +
> > +/* Command Ordinals */
> > +enum tpm_command_ordinals {
> > + TPM_ORD_CONTINUE_SELFTEST = 83,
> > + TPM_ORD_GET_CAP = 101,
> > + TPM_ORD_GET_RANDOM = 70,
> > + TPM_ORD_PCR_EXTEND = 20,
> > + TPM_ORD_PCR_READ = 21,
> > + TPM_ORD_OSAP = 11,
> > + TPM_ORD_OIAP = 10,
> > + TPM_ORD_SAVESTATE = 152,
> > + TPM_ORD_SEAL = 23,
> > + TPM_ORD_STARTUP = 153,
> > + TPM_ORD_UNSEAL = 24,
> > +};
> > +
> > +/* Other constants */
> > +#define SRKHANDLE 0x40000000
> > +#define TPM_NONCE_SIZE 20
> > +#define TPM_ST_CLEAR 1
> > +
> > +#endif
> > diff --git a/include/linux/tpm_command.h b/include/linux/tpm_command.h
> > deleted file mode 100644
> > index 02038972a05f..000000000000
> > --- a/include/linux/tpm_command.h
> > +++ /dev/null
> > @@ -1,30 +0,0 @@
> > -/* SPDX-License-Identifier: GPL-2.0 */
> > -#ifndef __LINUX_TPM_COMMAND_H__
> > -#define __LINUX_TPM_COMMAND_H__
> > -
> > -/*
> > - * TPM Command constants from specifications at
> > - * http://www.trustedcomputinggroup.org
> > - */
> > -
> > -/* Command TAGS */
> > -#define TPM_TAG_RQU_COMMAND 193
> > -#define TPM_TAG_RQU_AUTH1_COMMAND 194
> > -#define TPM_TAG_RQU_AUTH2_COMMAND 195
> > -#define TPM_TAG_RSP_COMMAND 196
> > -#define TPM_TAG_RSP_AUTH1_COMMAND 197
> > -#define TPM_TAG_RSP_AUTH2_COMMAND 198
> > -
> > -/* Command Ordinals */
> > -#define TPM_ORD_OIAP 10
> > -#define TPM_ORD_OSAP 11
> > -#define TPM_ORD_EXTEND 20
> > -#define TPM_ORD_SEAL 23
> > -#define TPM_ORD_UNSEAL 24
> > -#define TPM_ORD_GET_RANDOM 70
> > -
> > -/* Other constants */
> > -#define SRKHANDLE 0x40000000
> > -#define TPM_NONCE_SIZE 20
> > -
> > -#endif
> > diff --git a/include/linux/tpm_common.h b/include/linux/tpm_common.h
> > new file mode 100644
> > index 000000000000..b8be669913dd
> > --- /dev/null
> > +++ b/include/linux/tpm_common.h
> > @@ -0,0 +1,22 @@
> > +/* SPDX-License-Identifier: GPL-2.0-only */
> > +/*
> > + * Copyright (C) 2004,2007,2008 IBM Corporation
> > + *
> > + * Authors:
> > + * Leendert van Doorn <leendert@...son.ibm.com>
> > + * Dave Safford <safford@...son.ibm.com>
> > + * Reiner Sailer <sailer@...son.ibm.com>
> > + * Kylene Hall <kjhall@...ibm.com>
> > + * Debora Velarde <dvelarde@...ibm.com>
> > + *
> > + * Maintained by: <tpmdd_devel@...ts.sourceforge.net>
> > + *
> > + * Device driver for TCG/TCPA TPM (trusted platform module).
> > + * Specifications at www.trustedcomputinggroup.org
> > + */
> > +#ifndef __LINUX_TPM_COMMON_H__
> > +#define __LINUX_TPM_COMMON_H__
> > +
> > +#define TPM_MAX_ORDINAL 243
> > +
> > +#endif
By retaining tpm_command.h, this file neither won't be necessary.
> > diff --git a/security/keys/trusted-keys/trusted_tpm1.c b/security/keys/trusted-keys/trusted_tpm1.c
> > index 6e6a9fb48e63..3717a06a5212 100644
> > --- a/security/keys/trusted-keys/trusted_tpm1.c
> > +++ b/security/keys/trusted-keys/trusted_tpm1.c
> > @@ -17,7 +17,6 @@
> > #include <keys/trusted-type.h>
> > #include <linux/key-type.h>
> > #include <linux/tpm.h>
> > -#include <linux/tpm_command.h>
> >
> > #include <keys/trusted_tpm.h>
> >
> > diff --git a/security/keys/trusted-keys/trusted_tpm2.c b/security/keys/trusted-keys/trusted_tpm2.c
> > index 0a99bd051a25..e6000c71eeb6 100644
> > --- a/security/keys/trusted-keys/trusted_tpm2.c
> > +++ b/security/keys/trusted-keys/trusted_tpm2.c
> > @@ -9,7 +9,6 @@
> > #include <linux/string.h>
> > #include <linux/err.h>
> > #include <linux/tpm.h>
> > -#include <linux/tpm_command.h>
> >
> > #include <keys/trusted-type.h>
> > #include <keys/trusted_tpm.h>
> > --
> > 2.43.7
> >
BR, Jarkko
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