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authorJason Gunthorpe <jgunthorpe@obsidianresearch.com>2012-11-21 13:54:33 -0700
committerKent Yoder <key@linux.vnet.ibm.com>2013-02-05 09:38:22 -0600
commitc584af1926b7626ef3bdab3354382cb2bd434d36 (patch)
tree1d614a9e70d9a5195fa80c89f0027899c5af9531 /drivers/char
parent07b133e6060ba9de6cf6265fb23f0de8ec78e51c (diff)
TPM: Issue TPM_STARTUP at driver load if the TPM has not been started
The TPM will respond to TPM_GET_CAP with TPM_ERR_INVALID_POSTINIT if TPM_STARTUP has not been issued. Detect this and automatically issue TPM_STARTUP. This is for embedded applications where the kernel is the first thing to touch the TPM. Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Tested-by: Peter Huewe <peter.huewe@infineon.com> Reviewed-by: Peter Huewe <peter.huewe@infineon.com> Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/tpm/tpm.c44
-rw-r--r--drivers/char/tpm/tpm.h6
2 files changed, 46 insertions, 4 deletions
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index 0a08af031a57..023dfbaffe73 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -451,7 +451,7 @@ static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
return -EFAULT;
err = be32_to_cpu(cmd->header.out.return_code);
- if (err != 0)
+ if (err != 0 && desc)
dev_err(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
return err;
@@ -511,6 +511,25 @@ void tpm_gen_interrupt(struct tpm_chip *chip)
}
EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
+#define TPM_ORD_STARTUP cpu_to_be32(153)
+#define TPM_ST_CLEAR cpu_to_be16(1)
+#define TPM_ST_STATE cpu_to_be16(2)
+#define TPM_ST_DEACTIVATED cpu_to_be16(3)
+static const struct tpm_input_header tpm_startup_header = {
+ .tag = TPM_TAG_RQU_COMMAND,
+ .length = cpu_to_be32(12),
+ .ordinal = TPM_ORD_STARTUP
+};
+
+static int tpm_startup(struct tpm_chip *chip, __be16 startup_type)
+{
+ struct tpm_cmd_t start_cmd;
+ start_cmd.header.in = tpm_startup_header;
+ start_cmd.params.startup_in.startup_type = startup_type;
+ return transmit_cmd(chip, &start_cmd, TPM_INTERNAL_RESULT_SIZE,
+ "attempting to start the TPM");
+}
+
int tpm_get_timeouts(struct tpm_chip *chip)
{
struct tpm_cmd_t tpm_cmd;
@@ -524,11 +543,28 @@ int tpm_get_timeouts(struct tpm_chip *chip)
tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
+ rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, NULL);
- rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
- "attempting to determine the timeouts");
- if (rc)
+ if (rc == TPM_ERR_INVALID_POSTINIT) {
+ /* The TPM is not started, we are the first to talk to it.
+ Execute a startup command. */
+ dev_info(chip->dev, "Issuing TPM_STARTUP");
+ if (tpm_startup(chip, TPM_ST_CLEAR))
+ return rc;
+
+ tpm_cmd.header.in = tpm_getcap_header;
+ tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
+ tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
+ tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
+ rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
+ NULL);
+ }
+ if (rc) {
+ dev_err(chip->dev,
+ "A TPM error (%zd) occurred attempting to determine the timeouts\n",
+ rc);
goto duration;
+ }
if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
be32_to_cpu(tpm_cmd.header.out.length)
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 8ef7649a50aa..8971b128500b 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -47,6 +47,7 @@ enum tpm_addr {
#define TPM_WARN_DOING_SELFTEST 0x802
#define TPM_ERR_DEACTIVATED 0x6
#define TPM_ERR_DISABLED 0x7
+#define TPM_ERR_INVALID_POSTINIT 38
#define TPM_HEADER_SIZE 10
extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
@@ -291,6 +292,10 @@ struct tpm_getrandom_in {
__be32 num_bytes;
}__attribute__((packed));
+struct tpm_startup_in {
+ __be16 startup_type;
+} __packed;
+
typedef union {
struct tpm_getcap_params_out getcap_out;
struct tpm_readpubek_params_out readpubek_out;
@@ -301,6 +306,7 @@ typedef union {
struct tpm_pcrextend_in pcrextend_in;
struct tpm_getrandom_in getrandom_in;
struct tpm_getrandom_out getrandom_out;
+ struct tpm_startup_in startup_in;
} tpm_cmd_params;
struct tpm_cmd_t {