Merge branch 'next' into for-linus

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);