summaryrefslogtreecommitdiffstats
path: root/drivers/char/tpm/tpm_acpi.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/char/tpm/tpm_acpi.c')
-rw-r--r--drivers/char/tpm/tpm_acpi.c46
1 files changed, 23 insertions, 23 deletions
diff --git a/drivers/char/tpm/tpm_acpi.c b/drivers/char/tpm/tpm_acpi.c
index 565a9478cb94..b7718c95fd0b 100644
--- a/drivers/char/tpm/tpm_acpi.c
+++ b/drivers/char/tpm/tpm_acpi.c
@@ -6,10 +6,11 @@
* Stefan Berger <stefanb@us.ibm.com>
* Reiner Sailer <sailer@watson.ibm.com>
* Kylene Hall <kjhall@us.ibm.com>
+ * Nayna Jain <nayna@linux.vnet.ibm.com>
*
* Maintained by: <tpmdd-devel@lists.sourceforge.net>
*
- * Access to the eventlog extended by the TCG BIOS of PC platform
+ * Access to the event log extended by the TCG BIOS of PC platform
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@@ -45,29 +46,28 @@ struct acpi_tcpa {
};
/* read binary bios log */
-int read_log(struct tpm_bios_log *log)
+int tpm_read_log_acpi(struct tpm_chip *chip)
{
struct acpi_tcpa *buff;
acpi_status status;
void __iomem *virt;
u64 len, start;
+ struct tpm_bios_log *log;
- if (log->bios_event_log != NULL) {
- printk(KERN_ERR
- "%s: ERROR - Eventlog already initialized\n",
- __func__);
- return -EFAULT;
- }
+ log = &chip->log;
+
+ /* Unfortuntely ACPI does not associate the event log with a specific
+ * TPM, like PPI. Thus all ACPI TPMs will read the same log.
+ */
+ if (!chip->acpi_dev_handle)
+ return -ENODEV;
/* Find TCPA entry in RSDT (ACPI_LOGICAL_ADDRESSING) */
status = acpi_get_table(ACPI_SIG_TCPA, 1,
(struct acpi_table_header **)&buff);
- if (ACPI_FAILURE(status)) {
- printk(KERN_ERR "%s: ERROR - Could not get TCPA table\n",
- __func__);
- return -EIO;
- }
+ if (ACPI_FAILURE(status))
+ return -ENODEV;
switch(buff->platform_class) {
case BIOS_SERVER:
@@ -81,29 +81,29 @@ int read_log(struct tpm_bios_log *log)
break;
}
if (!len) {
- printk(KERN_ERR "%s: ERROR - TCPA log area empty\n", __func__);
+ dev_warn(&chip->dev, "%s: TCPA log area empty\n", __func__);
return -EIO;
}
/* malloc EventLog space */
log->bios_event_log = kmalloc(len, GFP_KERNEL);
- if (!log->bios_event_log) {
- printk("%s: ERROR - Not enough Memory for BIOS measurements\n",
- __func__);
+ if (!log->bios_event_log)
return -ENOMEM;
- }
log->bios_event_log_end = log->bios_event_log + len;
virt = acpi_os_map_iomem(start, len);
- if (!virt) {
- kfree(log->bios_event_log);
- printk("%s: ERROR - Unable to map memory\n", __func__);
- return -EIO;
- }
+ if (!virt)
+ goto err;
memcpy_fromio(log->bios_event_log, virt, len);
acpi_os_unmap_iomem(virt, len);
return 0;
+
+err:
+ kfree(log->bios_event_log);
+ log->bios_event_log = NULL;
+ return -EIO;
+
}