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tpm: redefine read_log() to handle ACPI/OF at runtime

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Currently, read_log() has two implementations: one for ACPI platforms
and the other for device tree(OF) based platforms. The proper one is
selected at compile time using Kconfig and #ifdef in the Makefile,
which is not the recommended approach.

This patch removes the #ifdef in the Makefile by defining a single
read_log() method, which checks for ACPI/OF event log properties at
runtime.

[jarkko.sakkinen@linux.intel.com: added tpm_ prefix to read_log*]

Suggested-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
This commit is contained in:
Nayna Jain 2016-11-14 05:00:54 -05:00 committed by Jarkko Sakkinen
parent f40e68ef4a
commit 02ae138288
5 changed files with 42 additions and 33 deletions
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14
drivers/char/tpm/Makefile
View File

@ -2,16 +2,10 @@
# Makefile for the kernel tpm device drivers.
#
obj-$(CONFIG_TCG_TPM) += tpm.o
tpm-y := tpm-interface.o tpm-dev.o tpm-sysfs.o tpm-chip.o tpm2-cmd.o
tpm-$(CONFIG_ACPI) += tpm_ppi.o
ifdef CONFIG_ACPI
tpm-y += tpm_eventlog.o tpm_acpi.o
else
ifdef CONFIG_TCG_IBMVTPM
tpm-y += tpm_eventlog.o tpm_of.o
endif
endif
tpm-y := tpm-interface.o tpm-dev.o tpm-sysfs.o tpm-chip.o tpm2-cmd.o \
tpm_eventlog.o
tpm-$(CONFIG_ACPI) += tpm_ppi.o tpm_acpi.o
tpm-$(CONFIG_OF) += tpm_of.o
obj-$(CONFIG_TCG_TIS_CORE) += tpm_tis_core.o
obj-$(CONFIG_TCG_TIS) += tpm_tis.o
obj-$(CONFIG_TCG_TIS_SPI) += tpm_tis_spi.o

9
drivers/char/tpm/tpm_acpi.c
View File

@ -6,6 +6,7 @@
* 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>
*
@ -45,7 +46,7 @@ struct acpi_tcpa {
};
/* read binary bios log */
int read_log(struct tpm_chip *chip)
int tpm_read_log_acpi(struct tpm_chip *chip)
{
struct acpi_tcpa *buff;
acpi_status status;
@ -54,12 +55,6 @@ int read_log(struct tpm_chip *chip)
struct tpm_bios_log *log;
log = &chip->log;
if (log->bios_event_log != NULL) {
printk(KERN_ERR
"%s: ERROR - Eventlog already initialized\n",
__func__);
return -EFAULT;
}
/* Find TCPA entry in RSDT (ACPI_LOGICAL_ADDRESSING) */
status = acpi_get_table(ACPI_SIG_TCPA, 1,

22
drivers/char/tpm/tpm_eventlog.c
View File

@ -356,6 +356,26 @@ static const struct file_operations tpm_bios_measurements_ops = {
.release = tpm_bios_measurements_release,
};
static int tpm_read_log(struct tpm_chip *chip)
{
int rc;
if (chip->log.bios_event_log != NULL) {
dev_dbg(&chip->dev,
"%s: ERROR - event log already initialized\n",
__func__);
return -EFAULT;
}
rc = tpm_read_log_acpi(chip);
if ((rc == 0) || (rc == -ENOMEM))
return rc;
rc = tpm_read_log_of(chip);
return rc;
}
int tpm_bios_log_setup(struct tpm_chip *chip)
{
const char *name = dev_name(&chip->dev);
@ -365,7 +385,7 @@ int tpm_bios_log_setup(struct tpm_chip *chip)
if (chip->flags & TPM_CHIP_FLAG_TPM2)
return 0;
rc = read_log(chip);
rc = tpm_read_log(chip);
/*
* read_log failure means event log is not supported except for ENOMEM.
*/

22
drivers/char/tpm/tpm_eventlog.h
View File

@ -73,20 +73,24 @@ enum tcpa_pc_event_ids {
HOST_TABLE_OF_DEVICES,
};
int read_log(struct tpm_chip *chip);
#if defined(CONFIG_TCG_IBMVTPM) || defined(CONFIG_TCG_IBMVTPM_MODULE) || \
defined(CONFIG_ACPI)
extern int tpm_bios_log_setup(struct tpm_chip *chip);
extern void tpm_bios_log_teardown(struct tpm_chip *chip);
#if defined(CONFIG_ACPI)
int tpm_read_log_acpi(struct tpm_chip *chip);
#else
static inline int tpm_bios_log_setup(struct tpm_chip *chip)
static inline int tpm_read_log_acpi(struct tpm_chip *chip)
{
return 0;
return -ENODEV;
}
static inline void tpm_bios_log_teardown(struct tpm_chip *chip)
#endif
#if defined(CONFIG_OF)
int tpm_read_log_of(struct tpm_chip *chip);
#else
static inline int tpm_read_log_of(struct tpm_chip *chip)
{
return -ENODEV;
}
#endif
int tpm_bios_log_setup(struct tpm_chip *chip);
void tpm_bios_log_teardown(struct tpm_chip *chip);
#endif

8
drivers/char/tpm/tpm_of.c
View File

@ -2,6 +2,7 @@
* Copyright 2012 IBM Corporation
*
* Author: Ashley Lai <ashleydlai@gmail.com>
* Nayna Jain <nayna@linux.vnet.ibm.com>
*
* Maintained by: <tpmdd-devel@lists.sourceforge.net>
*
@ -20,7 +21,7 @@
#include "tpm.h"
#include "tpm_eventlog.h"
int read_log(struct tpm_chip *chip)
int tpm_read_log_of(struct tpm_chip *chip)
{
struct device_node *np;
const u32 *sizep;
@ -28,11 +29,6 @@ int read_log(struct tpm_chip *chip)
struct tpm_bios_log *log;
log = &chip->log;
if (log->bios_event_log != NULL) {
pr_err("%s: ERROR - Eventlog already initialized\n", __func__);
return -EFAULT;
}
np = of_find_node_by_name(NULL, "vtpm");
if (!np) {
pr_err("%s: ERROR - IBMVTPM not supported\n", __func__);