[PATCH 1/3 v2] tpm: Add 'tpm autostart' shell command
Ilias Apalodimas
ilias.apalodimas at linaro.org
Wed Jun 7 11:18:10 CEST 2023
For a TPM device to be operational we need to initialize it and
perform its startup sequence. The 'tpm init' command currently calls
tpm_init() which ends up calling the ->open() per-device callback and
performs the initial hardware configuration as well as requesting
locality 0 for the caller. There no code that currently calls
tpm_init() without following up with a tpm_startup() and tpm_self_test_full()
or tpm_continue_self_test().
So let's add a 'tpm autostart' command and call tpm_auto_start() which
leaves the device in an operational state.
It's worth noting that calling tpm_init() only, doesn't allow a someone
to use the TPM since the startup sequence is mandatory. We always
repeat the pattern of calling
- tpm_init()
- tpm_startup()
- tpm_self_test_full() or tpm_continue_self_test()
Signed-off-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>
Reviewed-by: Simon Glass <sjg at chromium.org>
---
- Changes since v1: None
cmd/tpm-common.c | 16 ++++++++++++++++
cmd/tpm-user-utils.h | 1 +
cmd/tpm-v1.c | 6 +++++-
cmd/tpm-v2.c | 6 ++++++
4 files changed, 28 insertions(+), 1 deletion(-)
diff --git a/cmd/tpm-common.c b/cmd/tpm-common.c
index d0c63cadf413..a7dc23d85d5d 100644
--- a/cmd/tpm-common.c
+++ b/cmd/tpm-common.c
@@ -11,6 +11,7 @@
#include <asm/unaligned.h>
#include <linux/string.h>
#include <tpm-common.h>
+#include <tpm_api.h>
#include "tpm-user-utils.h"
static struct udevice *tpm_dev;
@@ -367,6 +368,21 @@ int do_tpm_init(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
return report_return_code(tpm_init(dev));
}
+int do_tpm_autostart(struct cmd_tbl *cmdtp, int flag, int argc,
+ char *const argv[])
+{
+ struct udevice *dev;
+ int rc;
+
+ if (argc != 1)
+ return CMD_RET_USAGE;
+ rc = get_tpm(&dev);
+ if (rc)
+ return rc;
+
+ return report_return_code(tpm_auto_start(dev));
+}
+
int do_tpm(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
struct cmd_tbl *tpm_commands, *cmd;
diff --git a/cmd/tpm-user-utils.h b/cmd/tpm-user-utils.h
index de4a934aab6c..dfa11353e122 100644
--- a/cmd/tpm-user-utils.h
+++ b/cmd/tpm-user-utils.h
@@ -20,6 +20,7 @@ int get_tpm(struct udevice **devp);
int do_tpm_device(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[]);
int do_tpm_init(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);
+int do_tpm_autostart(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);
int do_tpm_info(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);
int do_tpm_report_state(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[]);
diff --git a/cmd/tpm-v1.c b/cmd/tpm-v1.c
index 0efb079b0a9b..3b95c950cc96 100644
--- a/cmd/tpm-v1.c
+++ b/cmd/tpm-v1.c
@@ -655,6 +655,7 @@ TPM_COMMAND_NO_ARG(tpm_physical_disable)
static struct cmd_tbl tpm1_commands[] = {
U_BOOT_CMD_MKENT(device, 0, 1, do_tpm_device, "", ""),
U_BOOT_CMD_MKENT(info, 0, 1, do_tpm_info, "", ""),
+ U_BOOT_CMD_MKENT(init, 0, 1, do_tpm_autostart, "", ""),
U_BOOT_CMD_MKENT(init, 0, 1, do_tpm_init, "", ""),
U_BOOT_CMD_MKENT(startup, 0, 1,
do_tpm_startup, "", ""),
@@ -733,9 +734,12 @@ U_BOOT_CMD(tpm, CONFIG_SYS_MAXARGS, 1, do_tpm,
" device [num device]\n"
" - Show all devices or set the specified device\n"
" info - Show information about the TPM\n"
+" autostart\n"
+" - Initalize the tpm, perform a Startup(clear) and run a full selftest\n"
+" sequence\n"
" init\n"
" - Put TPM into a state where it waits for 'startup' command.\n"
-" startup mode\n"
+" startup mode\n"
" - Issue TPM_Starup command. <mode> is one of TPM_ST_CLEAR,\n"
" TPM_ST_STATE, and TPM_ST_DEACTIVATED.\n"
"Admin Testing Commands:\n"
diff --git a/cmd/tpm-v2.c b/cmd/tpm-v2.c
index d93b83ada934..7e479b9dfe36 100644
--- a/cmd/tpm-v2.c
+++ b/cmd/tpm-v2.c
@@ -370,6 +370,7 @@ static struct cmd_tbl tpm2_commands[] = {
U_BOOT_CMD_MKENT(dam_reset, 0, 1, do_tpm_dam_reset, "", ""),
U_BOOT_CMD_MKENT(dam_parameters, 0, 1, do_tpm_dam_parameters, "", ""),
U_BOOT_CMD_MKENT(change_auth, 0, 1, do_tpm_change_auth, "", ""),
+ U_BOOT_CMD_MKENT(autostart, 0, 1, do_tpm_autostart, "", ""),
U_BOOT_CMD_MKENT(pcr_setauthpolicy, 0, 1,
do_tpm_pcr_setauthpolicy, "", ""),
U_BOOT_CMD_MKENT(pcr_setauthvalue, 0, 1,
@@ -392,8 +393,13 @@ U_BOOT_CMD(tpm2, CONFIG_SYS_MAXARGS, 1, do_tpm, "Issue a TPMv2.x command",
" Show information about the TPM.\n"
"state\n"
" Show internal state from the TPM (if available)\n"
+"autostart\n"
+" Initalize the tpm, perform a Startup(clear) and run a full selftest\n"
+" sequence\n"
"init\n"
" 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"
" Issue a TPM2_Startup command.\n"
" <mode> is one of:\n"
--
2.39.2
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