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tpm: have event log use the tpm_chip

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Move the backing memory for the event log into tpm_chip and push
the tpm_chip into read_log. This optimizes read_log processing by
only doing it once and prepares things for the next patches in the
series which require the tpm_chip to locate the event log via
ACPI and OF handles instead of searching.

This is straightfoward except for the issue of passing a kref through
i_private with securityfs. Since securityfs_remove does not have any
removal fencing like sysfs we use the inode lock to safely get a
kref on the tpm_chip.

Suggested-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.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 05:00:52 -05:00
committed by Jarkko Sakkinen
parent 7518a21a9d
commit 748935eeb7
6 changed files with 83 additions and 36 deletions
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11
drivers/char/tpm/tpm.h
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@@ -35,6 +35,8 @@
#include <linux/cdev.h>
#include <linux/highmem.h>
#include "tpm_eventlog.h"
enum tpm_const {
TPM_MINOR = 224, /* officially assigned */
TPM_BUFSIZE = 4096,
@@ -146,6 +148,11 @@ enum tpm_chip_flags {
TPM_CHIP_FLAG_HAVE_TIMEOUTS = BIT(4),
};
struct tpm_chip_seqops {
struct tpm_chip *chip;
const struct seq_operations *seqops;
};
struct tpm_chip {
struct device dev;
struct cdev cdev;
@@ -157,6 +164,10 @@ struct tpm_chip {
struct rw_semaphore ops_sem;
const struct tpm_class_ops *ops;
struct tpm_bios_log log;
struct tpm_chip_seqops bin_log_seqops;
struct tpm_chip_seqops ascii_log_seqops;
unsigned int flags;
int dev_num; /* /dev/tpm# */