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-rw-r--r--drivers/char/tpm/Kconfig6
-rw-r--r--drivers/char/tpm/tpm.c47
-rw-r--r--drivers/char/tpm/tpm_tis.c40
3 files changed, 65 insertions, 28 deletions
diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
index f5fc64f89c5c..4dc338f3d1aa 100644
--- a/drivers/char/tpm/Kconfig
+++ b/drivers/char/tpm/Kconfig
@@ -17,14 +17,16 @@ menuconfig TCG_TPM
obtained at: <http://sourceforge.net/projects/trousers>. To
compile this driver as a module, choose M here; the module
will be called tpm. If unsure, say N.
- Note: For more TPM drivers enable CONFIG_PNP, CONFIG_ACPI
+ Notes:
+ 1) For more TPM drivers enable CONFIG_PNP, CONFIG_ACPI
and CONFIG_PNPACPI.
+ 2) Without ACPI enabled, the BIOS event log won't be accessible,
+ which is required to validate the PCR 0-7 values.
if TCG_TPM
config TCG_TIS
tristate "TPM Interface Specification 1.2 Interface"
- depends on PNP
---help---
If you have a TPM security chip that is compliant with the
TCG TIS 1.2 TPM specification say Yes and it will be accessible
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index 068c816e6942..05ad4a17a28f 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -1068,6 +1068,27 @@ void tpm_remove_hardware(struct device *dev)
}
EXPORT_SYMBOL_GPL(tpm_remove_hardware);
+#define TPM_ORD_SAVESTATE cpu_to_be32(152)
+#define SAVESTATE_RESULT_SIZE 10
+
+static struct tpm_input_header savestate_header = {
+ .tag = TPM_TAG_RQU_COMMAND,
+ .length = cpu_to_be32(10),
+ .ordinal = TPM_ORD_SAVESTATE
+};
+
+/* Bug workaround - some TPM's don't flush the most
+ * recently changed pcr on suspend, so force the flush
+ * with an extend to the selected _unused_ non-volatile pcr.
+ */
+static int tpm_suspend_pcr;
+static int __init tpm_suspend_setup(char *str)
+{
+ get_option(&str, &tpm_suspend_pcr);
+ return 1;
+}
+__setup("tpm_suspend_pcr=", tpm_suspend_setup);
+
/*
* We are about to suspend. Save the TPM state
* so that it can be restored.
@@ -1075,17 +1096,29 @@ EXPORT_SYMBOL_GPL(tpm_remove_hardware);
int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
{
struct tpm_chip *chip = dev_get_drvdata(dev);
- u8 savestate[] = {
- 0, 193, /* TPM_TAG_RQU_COMMAND */
- 0, 0, 0, 10, /* blob length (in bytes) */
- 0, 0, 0, 152 /* TPM_ORD_SaveState */
- };
+ struct tpm_cmd_t cmd;
+ int rc;
+
+ u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
if (chip == NULL)
return -ENODEV;
- tpm_transmit(chip, savestate, sizeof(savestate));
- return 0;
+ /* for buggy tpm, flush pcrs with extend to selected dummy */
+ if (tpm_suspend_pcr) {
+ cmd.header.in = pcrextend_header;
+ cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
+ memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
+ TPM_DIGEST_SIZE);
+ rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
+ "extending dummy pcr before suspend");
+ }
+
+ /* now do the actual savestate */
+ cmd.header.in = savestate_header;
+ rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE,
+ "sending savestate before suspend");
+ return rc;
}
EXPORT_SYMBOL_GPL(tpm_pm_suspend);
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index 94345994f8a6..24314a9cffe8 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -598,7 +598,7 @@ out_err:
tpm_remove_hardware(chip->dev);
return rc;
}
-
+#ifdef CONFIG_PNP
static int __devinit tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
const struct pnp_device_id *pnp_id)
{
@@ -663,7 +663,7 @@ static struct pnp_driver tis_pnp_driver = {
module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id,
sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444);
MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");
-
+#endif
static int tpm_tis_suspend(struct platform_device *dev, pm_message_t msg)
{
return tpm_pm_suspend(&dev->dev, msg);
@@ -690,21 +690,21 @@ MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry");
static int __init init_tis(void)
{
int rc;
+#ifdef CONFIG_PNP
+ if (!force)
+ return pnp_register_driver(&tis_pnp_driver);
+#endif
- if (force) {
- rc = platform_driver_register(&tis_drv);
- if (rc < 0)
- return rc;
- if (IS_ERR(pdev=platform_device_register_simple("tpm_tis", -1, NULL, 0)))
- return PTR_ERR(pdev);
- if((rc=tpm_tis_init(&pdev->dev, TIS_MEM_BASE, TIS_MEM_LEN, 0)) != 0) {
- platform_device_unregister(pdev);
- platform_driver_unregister(&tis_drv);
- }
+ rc = platform_driver_register(&tis_drv);
+ if (rc < 0)
return rc;
+ if (IS_ERR(pdev=platform_device_register_simple("tpm_tis", -1, NULL, 0)))
+ return PTR_ERR(pdev);
+ if((rc=tpm_tis_init(&pdev->dev, TIS_MEM_BASE, TIS_MEM_LEN, 0)) != 0) {
+ platform_device_unregister(pdev);
+ platform_driver_unregister(&tis_drv);
}
-
- return pnp_register_driver(&tis_pnp_driver);
+ return rc;
}
static void __exit cleanup_tis(void)
@@ -728,12 +728,14 @@ static void __exit cleanup_tis(void)
list_del(&i->list);
}
spin_unlock(&tis_lock);
-
- if (force) {
- platform_device_unregister(pdev);
- platform_driver_unregister(&tis_drv);
- } else
+#ifdef CONFIG_PNP
+ if (!force) {
pnp_unregister_driver(&tis_pnp_driver);
+ return;
+ }
+#endif
+ platform_device_unregister(pdev);
+ platform_driver_unregister(&tis_drv);
}
module_init(init_tis);