diff options
| author | James Bottomley <James.Bottomley@HansenPartnership.com> | 2017-01-03 09:07:32 -0800 |
|---|---|---|
| committer | Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> | 2017-04-03 22:46:02 +0300 |
| commit | fdc915f7f71939ad5a3dda3389b8d2d7a7c5ee66 (patch) | |
| tree | ef6a2c935e96f15082832fda56cf4f10be9a97fd /drivers/char/tpm/tpm.h | |
| parent | ecb38e2f521b01f0fd0b0a3261921b0bcc002dd0 (diff) | |
tpm: expose spaces via a device link /dev/tpmrm<n>
Currently the tpm spaces are not exposed to userspace. Make this
exposure via a separate device, which can now be opened multiple times
because each read/write transaction goes separately via the space.
Concurrency is protected by the chip->tpm_mutex for each read/write
transaction separately. The TPM is cleared of all transient objects
by the time the mutex is dropped, so there should be no interference
between the kernel and userspace.
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Diffstat (limited to 'drivers/char/tpm/tpm.h')
| -rw-r--r-- | drivers/char/tpm/tpm.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index 023fc02ad0f6..16dd207a4542 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -182,7 +182,9 @@ struct tpm_chip_seqops { struct tpm_chip { struct device dev; + struct device devs; struct cdev cdev; + struct cdev cdevs; /* A driver callback under ops cannot be run unless ops_sem is held * (sometimes implicitly, eg for the sysfs code). ops becomes null @@ -510,8 +512,10 @@ static inline void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value) } extern struct class *tpm_class; +extern struct class *tpmrm_class; extern dev_t tpm_devt; extern const struct file_operations tpm_fops; +extern const struct file_operations tpmrm_fops; extern struct idr dev_nums_idr; enum tpm_transmit_flags { |