linux-kernel - [PATCH v8 0/2] Fix corner cases with disabling CLKRUN in tpm

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Date:   Mon,  1 Jan 2018 20:05:42 -0800
From:   Azhar Shaikh <azhar.shaikh@...el.com>
To:     jarkko.sakkinen@...ux.intel.com, jgg@...pe.ca, peterhuewe@....de
Cc:     linux-security-module@...r.kernel.org,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        azhar.shaikh@...el.com
Subject: [PATCH v8 0/2] Fix corner cases with disabling CLKRUN in tpm_tis

Changes from v1:
- Patch 1: "tpm: Keep CLKRUN enabled throughout the duration of transmit_cmd()"
  - Add NULL checks before calling clk_toggle callback
  - Use IS_ENABLED instead of ifdef in tpm_tis_clkrun_toggle()
  - Do not call tpm_platform_begin_xfer() and tpm_platform_end_xfer()
    from tpm_tis_clkrun_toggle(). Make them static again.

- Patch 2: "tpm_tis: Move ilb_base_addr to tpm_tis_tcg_phy"
  - This is a new patch in this series as per suggestion from Jason.
  - Is the current implementation ok or I should move the code in tpm_tis_pnp_remove()
    and tpm_tis_plat_remove() inside tpm_tis_remove(). That way all the unmapping
    can be done in one place, instead of 3 different places now. Also the unmapping
    in tpm_tis_init() can be moved to tpm_tis_remove(), since in case of error
    tpm_tis_core_init() calls tpm_tis_remove(). Kindly suggest.

Changes from v2:
- Patch 1: "tpm: Keep CLKRUN enabled throughout the duration of transmit_cmd()"
  - No changes

- Patch 2: "tpm_tis: Move ilb_base_addr to tpm_tis_tcg_phy"
  - Updated is_bsw() function to have the #ifdef CONFIG_X86 check within the function
    itself. Also removed the #ifdef CONFIG_X86 from all other places around is_bsw()

Changes from v3:
- Patch 1: "tpm: Keep CLKRUN enabled throughout the duration of transmit_cmd()"
  - Change function name from clk_toggle to clk_enable
  - Update the commit message.

- Patch 2: "tpm_tis: Move ilb_base_addr to tpm_tis_tcg_phy"
  - No changes

Changes from v4:
- The numbering of patches is now interchanged.

- Patch 1: "tpm_tis: Move ilb_base_addr to tpm_tis_data"
  - Had to move ilb_base_addr to tpm_tis_data, from tpm_tis_tcg_phy.
    Since the ioremapping of ilb_base_addr had to be done before any TPM access,
    hence moved the variable to tpm_tis_data.
  - Also move the ioremapping of ilb_base_addr from tpm_tis_init() to
    tpm_tis_core_init() i.e. before any TPM access is done.
  - Rename marco LPC_CNTRL_REG_OFFSET to LPC_CNTRL_OFFSET
  - Update the commit message.

- Patch 2: "tpm: Keep CLKRUN enabled throughout the duration of transmit_cmd()"
  - Remove the functions tpm_platform_begin_xfer() and tpm_platform_end_xfer()
  - Move the code from these functions to tpm_tis_clkrun_enable().

Changes from v5:
- Patch 1: "tpm_tis: Move ilb_base_addr to tpm_tis_data"
  - No changes

- Patch 2: "tpm: Keep CLKRUN enabled throughout the duration of transmit_cmd()"
  - Update the commit message.

Changes from v6:
- - Patch 1: "tpm_tis: Move ilb_base_addr to tpm_tis_data"
  - No changes

- Patch 2: "tpm: Keep CLKRUN enabled throughout the duration of transmit_cmd()"
  - chip->ops was set to NULL in tpm_del_char_device() called from tpm_chip_unregister() in
    error/driver exit path. Fix this code. (Suggested by Javier Martinez Canillas and Jason Gunthorpe)
  - Add a comment in tpm_tis_clkrun_enable() function.

Changes from v7:
- Patch 1: "tpm_tis: Move ilb_base_addr to tpm_tis_data"
  - No changes

- Patch 2: "tpm: Keep CLKRUN enabled throughout the duration of transmit_cmd()"
  - Remove unused variables warnings from tpm_tis_pnp_remove() and tpm_tis_plat_remove()
    (Suggested by Stephen Rothwell <sfr@...b.auug.org.au>)

Azhar Shaikh (2):
  tpm_tis: Move ilb_base_addr to tpm_tis_data
  tpm: Keep CLKRUN enabled throughout the duration of transmit_cmd()

 drivers/char/tpm/tpm-interface.c |   6 +++
 drivers/char/tpm/tpm_tis.c       | 113 ++++----------------------------------
 drivers/char/tpm/tpm_tis_core.c  | 114 ++++++++++++++++++++++++++++++++++++---
 drivers/char/tpm/tpm_tis_core.h  |  17 ++++++
 include/linux/tpm.h              |   1 +
 5 files changed, 142 insertions(+), 109 deletions(-)

-- 
1.9.1