[lkml]   [2013]   [Sep]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Subject[PATCH 00/13] TPM cleanup
While writing two new TPM drivers I noticed that there was a big and growing
mess in drivers/char/tpm. This series of patches is the first batch of patches
containing my attempt to fix it.

This series makes several small repetitive changes to all the drivers. These
are bundled in with the commits changing the core, because the core API is
changed and everything must be kept together to retain bisect-ability.

I have decided not to tackle the lifetime issues in this series. My
first attempt was flawed.

I have presented the series in the full linear format. It is available on
my github:
The branch is not stable, I will rebase and rewrite history as needed.

All patches have been compile tested on x86-64 (including vtpm, I have a hack
to make that happen) and all patches are clean.

I have tested tpm_tis (PPC32), tpm_i2c_atmel and tpm_i2c_nuvoton (ARM32) on my
hardware here.

There is very little new code here, the majority of lines is just code motion
to remove duplication.

Patches 1 -> 6, 12
- These are just simple cleanups that I discovered while doing the other

Patch 7
- This is important to unify the sysfs code. I've choosen to simplify
and not make the TPM version bus-dependent.

Patch 8-9
- The drivers have this duplication of the file_operations
and sysfs code. This series pulls all of that code out of the drivers
and into the core

Patches 10->11
- This is the first step in making the TPM subsystem be like other
subsystems in the kernel.

Patches 13
- This cleans up the struct tpm_chip by hiding stuff that isn't

This is already a fair clean up, but there is still more to do someday:
* The lifetime issues around struct tpm_chip/etc and the way userspace
can hold /dev/tpmX open even after the driver has detached.
* struct tpm_chip and struct tpm_vendor_specific need to be merged
* The above two structs have many members that are never used by the
core code. These members need to be migrated into driver
private structures
* The resulting merged struct should live in linux/include/tpm.h
like all other device classes in the kernel.
* Several drivers need clean up to move singleton static
variables into dynamic structures
* Consolidate TCG defined constants that are duplicated in many
* Consolidate device startup (tpm_startup, tpm_get_timeoutes)
into core code

If this series is successful I may be able to do some of the above as well.

Jason Gunthorpe (13):
tpm: ibmvtpm: Use %zd formatting for size_t format arguments
tpm atmel: Call request_region with the correct base
tpm: xen-tpmfront: Fix default durations
tpm: Store devname in the tpm_chip
tpm: Use container_of to locate the tpm_chip in tpm_open
tpm: Remove redundant dev_set_drvdata
tpm: Remove tpm_show_caps_1_2
tpm: Pull everything related to /dev/tpmX into tpm-dev.c
tpm: Pull everything related to sysfs into tpm-sysfs.c
tpm: Create a tpm_class_ops structure and use it in the drivers
tpm: Use the ops structure instead of a copy in tpm_vendor_specific
tpm: st33: Remove chip->data_buffer access from this driver
tpm: Make tpm-dev allocate a per-file structure

drivers/char/tpm/Makefile | 2 +-
drivers/char/tpm/tpm-dev.c | 213 +++++++++++++++
drivers/char/tpm/tpm-sysfs.c | 318 ++++++++++++++++++++++
drivers/char/tpm/tpm.c | 524 +++---------------------------------
drivers/char/tpm/tpm.h | 86 +++---
drivers/char/tpm/tpm_atmel.c | 30 +--
drivers/char/tpm/tpm_i2c_atmel.c | 42 +--
drivers/char/tpm/tpm_i2c_infineon.c | 44 +--
drivers/char/tpm/tpm_i2c_nuvoton.c | 42 +--
drivers/char/tpm/tpm_i2c_stm_st33.c | 51 +---
drivers/char/tpm/tpm_ibmvtpm.c | 44 +--
drivers/char/tpm/tpm_infineon.c | 28 +-
drivers/char/tpm/tpm_nsc.c | 28 +-
drivers/char/tpm/tpm_spi_stm_st33.c | 50 +---
drivers/char/tpm/tpm_tis.c | 43 +--
drivers/char/tpm/xen-tpmfront.c | 57 +---
include/linux/tpm.h | 15 ++
17 files changed, 638 insertions(+), 979 deletions(-)
create mode 100644 drivers/char/tpm/tpm-dev.c
create mode 100644 drivers/char/tpm/tpm-sysfs.c


 \ /
  Last update: 2013-09-23 20:41    [W:0.156 / U:0.860 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site