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tpm: add TPM2_Shutdown command

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TPM2_shutdown command is sharing same structure and logics with
TPM2_startup, thus this patch extends the existing startup APIs and
cmd functions to support shutdown instead of created new ones.

Signed-off-by: Raymond Mao <raymond.mao@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Raymond Mao 2025-01-27 06:58:46 -08:00 • committed by Ilias Apalodimas
parent a517796cfa
commit 6d8e52a6e3
4 changed files with 20 additions and 10 deletions
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14
cmd/tpm-v2.c
View file

@ -18,11 +18,14 @@ static int do_tpm2_startup(struct cmd_tbl *cmdtp, int flag, int argc,
enum tpm2_startup_types mode;
struct udevice *dev;
int ret;
bool bon = true;
ret = get_tpm(&dev);
if (ret)
return ret;
if (argc != 2)
/* argv[2] is optional to perform a TPM2_CC_SHUTDOWN */
if (argc > 3 || (argc == 3 && strcasecmp("off", argv[2])))
return CMD_RET_USAGE;
if (!strcasecmp("TPM2_SU_CLEAR", argv[1])) {
@ -34,7 +37,10 @@ static int do_tpm2_startup(struct cmd_tbl *cmdtp, int flag, int argc,
return CMD_RET_FAILURE;
}
return report_return_code(tpm2_startup(dev, mode));
if (argv[2])
bon = false;
return report_return_code(tpm2_startup(dev, bon, mode));
}
static int do_tpm2_self_test(struct cmd_tbl *cmdtp, int flag, int argc,
@ -420,11 +426,13 @@ U_BOOT_CMD(tpm2, CONFIG_SYS_MAXARGS, 1, do_tpm, "Issue a TPMv2.x command",
" Initialize the software stack. Always the first command to issue.\n"
" 'tpm startup' is the only acceptable command after a 'tpm init' has been\n"
" issued\n"
"startup <mode>\n"
"startup <mode> [<op>]\n"
" Issue a TPM2_Startup command.\n"
" <mode> is one of:\n"
" * TPM2_SU_CLEAR (reset state)\n"
" * TPM2_SU_STATE (preserved state)\n"
" <op>:\n"
" * off - To shutdown the TPM\n"
"self_test <type>\n"
" Test the TPM capabilities.\n"
" <type> is one of:\n"

3
include/tpm-v2.h
View file

@ -230,6 +230,7 @@ enum tpm2_command_codes {
TPM2_CC_PCR_READ = 0x017E,
TPM2_CC_PCR_EXTEND = 0x0182,
TPM2_CC_PCR_SETAUTHVAL = 0x0183,
TPM2_CC_SHUTDOWN = 0x0145,
};
/**
@ -430,7 +431,7 @@ enum {
*
* Return: code of the operation
*/
u32 tpm2_startup(struct udevice *dev, enum tpm2_startup_types mode);
u32 tpm2_startup(struct udevice *dev, bool onoff, enum tpm2_startup_types mode);
/**
* Issue a TPM2_SelfTest command.

9
lib/tpm-v2.c
View file

@ -44,12 +44,13 @@ static int tpm2_update_active_banks(struct udevice *dev)
return 0;
}
u32 tpm2_startup(struct udevice *dev, enum tpm2_startup_types mode)
u32 tpm2_startup(struct udevice *dev, bool bon, enum tpm2_startup_types mode)
{
int op = bon ? TPM2_CC_STARTUP : TPM2_CC_SHUTDOWN;
const u8 command_v2[12] = {
tpm_u16(TPM2_ST_NO_SESSIONS),
tpm_u32(12),
tpm_u32(TPM2_CC_STARTUP),
tpm_u32(op),
tpm_u16(mode),
};
int ret;
@ -59,7 +60,7 @@ u32 tpm2_startup(struct udevice *dev, enum tpm2_startup_types mode)
* but will return RC_INITIALIZE otherwise.
*/
ret = tpm_sendrecv_command(dev, command_v2, NULL, NULL);
if (ret && ret != TPM2_RC_INITIALIZE)
if ((ret && ret != TPM2_RC_INITIALIZE) || !bon)
return ret;
return tpm2_update_active_banks(dev);
@ -84,7 +85,7 @@ u32 tpm2_auto_start(struct udevice *dev)
rc = tpm2_self_test(dev, TPMI_YES);
if (rc == TPM2_RC_INITIALIZE) {
rc = tpm2_startup(dev, TPM2_SU_CLEAR);
rc = tpm2_startup(dev, true, TPM2_SU_CLEAR);
if (rc)
return rc;

4
lib/tpm_api.c
View file

@ -28,7 +28,7 @@ u32 tpm_startup(struct udevice *dev, enum tpm_startup_type mode)
case TPM_ST_DEACTIVATED:
return -EINVAL;
}
return tpm2_startup(dev, type);
return tpm2_startup(dev, true, type);
} else {
return -ENOSYS;
}
@ -60,7 +60,7 @@ u32 tpm_resume(struct udevice *dev)
if (tpm_is_v1(dev))
return tpm1_startup(dev, TPM_ST_STATE);
else if (tpm_is_v2(dev))
return tpm2_startup(dev, TPM2_SU_STATE);
return tpm2_startup(dev, true, TPM2_SU_STATE);
else
return -ENOSYS;
}