X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=drivers%2Fchar%2Ftpm%2Ftpm.c;h=2e12b3f9813971b59f6bb7db9a3c0937b507a330;hb=68d6e6713fcb;hp=caf8012ef47ce1c69af6f07df4f62e7c5676a581;hpb=455ce9d8410d381f56a1676449a723ca1985b369;p=mv-sheeva.git

diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index caf8012ef47..2e12b3f9813 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -527,7 +527,7 @@ void tpm_gen_interrupt(struct tpm_chip *chip)
 }
 EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
 
-void tpm_get_timeouts(struct tpm_chip *chip)
+int tpm_get_timeouts(struct tpm_chip *chip)
 {
 	struct tpm_cmd_t tpm_cmd;
 	struct timeout_t *timeout_cap;
@@ -549,7 +549,7 @@ void tpm_get_timeouts(struct tpm_chip *chip)
 	if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
 	    be32_to_cpu(tpm_cmd.header.out.length)
 	    != sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
-		return;
+		return -EINVAL;
 
 	timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
 	/* Don't overwrite default if value is 0 */
@@ -580,12 +580,12 @@ duration:
 	rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
 			"attempting to determine the durations");
 	if (rc)
-		return;
+		return rc;
 
 	if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
 	    be32_to_cpu(tpm_cmd.header.out.length)
 	    != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
-		return;
+		return -EINVAL;
 
 	duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
 	chip->vendor.duration[TPM_SHORT] =
@@ -607,20 +607,36 @@ duration:
 		chip->vendor.duration_adjusted = true;
 		dev_info(chip->dev, "Adjusting TPM timeout parameters.");
 	}
+	return 0;
 }
 EXPORT_SYMBOL_GPL(tpm_get_timeouts);
 
-void tpm_continue_selftest(struct tpm_chip *chip)
+#define TPM_ORD_CONTINUE_SELFTEST 83
+#define CONTINUE_SELFTEST_RESULT_SIZE 10
+
+static struct tpm_input_header continue_selftest_header = {
+	.tag = TPM_TAG_RQU_COMMAND,
+	.length = cpu_to_be32(10),
+	.ordinal = cpu_to_be32(TPM_ORD_CONTINUE_SELFTEST),
+};
+
+/**
+ * tpm_continue_selftest -- run TPM's selftest
+ * @chip: TPM chip to use
+ *
+ * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
+ * a TPM error code.
+ */
+static int tpm_continue_selftest(struct tpm_chip *chip)
 {
-	u8 data[] = {
-		0, 193,			/* TPM_TAG_RQU_COMMAND */
-		0, 0, 0, 10,		/* length */
-		0, 0, 0, 83,		/* TPM_ORD_ContinueSelfTest */
-	};
+	int rc;
+	struct tpm_cmd_t cmd;
 
-	tpm_transmit(chip, data, sizeof(data));
+	cmd.header.in = continue_selftest_header;
+	rc = transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
+			  "continue selftest");
+	return rc;
 }
-EXPORT_SYMBOL_GPL(tpm_continue_selftest);
 
 ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
 			char *buf)
@@ -715,7 +731,7 @@ static struct tpm_input_header pcrread_header = {
 	.ordinal = TPM_ORDINAL_PCRREAD
 };
 
-int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
+static int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
 {
 	int rc;
 	struct tpm_cmd_t cmd;
@@ -795,6 +811,45 @@ int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
 }
 EXPORT_SYMBOL_GPL(tpm_pcr_extend);
 
+/**
+ * tpm_do_selftest - have the TPM continue its selftest and wait until it
+ *                   can receive further commands
+ * @chip: TPM chip to use
+ *
+ * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
+ * a TPM error code.
+ */
+int tpm_do_selftest(struct tpm_chip *chip)
+{
+	int rc;
+	u8 digest[TPM_DIGEST_SIZE];
+	unsigned int loops;
+	unsigned int delay_msec = 1000;
+	unsigned long duration;
+
+	duration = tpm_calc_ordinal_duration(chip,
+	                                     TPM_ORD_CONTINUE_SELFTEST);
+
+	loops = jiffies_to_msecs(duration) / delay_msec;
+
+	rc = tpm_continue_selftest(chip);
+	/* This may fail if there was no TPM driver during a suspend/resume
+	 * cycle; some may return 10 (BAD_ORDINAL), others 28 (FAILEDSELFTEST)
+	 */
+	if (rc)
+		return rc;
+
+	do {
+		rc = __tpm_pcr_read(chip, 0, digest);
+		if (rc != TPM_WARN_DOING_SELFTEST)
+			return rc;
+		msleep(delay_msec);
+	} while (--loops > 0);
+
+	return rc;
+}
+EXPORT_SYMBOL_GPL(tpm_do_selftest);
+
 int tpm_send(u32 chip_num, void *cmd, size_t buflen)
 {
 	struct tpm_chip *chip;
@@ -963,6 +1018,9 @@ ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
 {
 	struct tpm_chip *chip = dev_get_drvdata(dev);
 
+	if (chip->vendor.duration[TPM_LONG] == 0)
+		return 0;
+
 	return sprintf(buf, "%d %d %d [%s]\n",
 		       jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
 		       jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),