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From:   "Shaikh, Azhar" <azhar.shaikh@intel.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
CC:     "jgunthorpe@obsidianresearch.com" <jgunthorpe@obsidianresearch.com>,
        "peterhuewe@gmx.de" <peterhuewe@gmx.de>,
        "linux-security-module@vger.kernel.org" 
        <linux-security-module@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "tpmdd-devel@lists.sourceforge.net" 
        <tpmdd-devel@lists.sourceforge.net>
Subject: RE: [PATCH v6 0/2] Fix corner cases with disabling CLKRUN in tpm_tis
Thread-Topic: [PATCH v6 0/2] Fix corner cases with disabling CLKRUN in
 tpm_tis
Thread-Index: AQHTafk7Qf0xjWUknUGu5736T6G/VaMtQGHQ
Date:   Thu, 30 Nov 2017 18:37:23 +0000
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 <20171130163516.uazhkglg7yfzpuvo@linux.intel.com>
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>-----Original Message-----
>From: Jarkko Sakkinen [mailto:jarkko.sakkinen@linux.intel.com]
>Sent: Thursday, November 30, 2017 8:35 AM
>To: Shaikh, Azhar <azhar.shaikh@intel.com>
>Cc: jgunthorpe@obsidianresearch.com; peterhuewe@gmx.de; linux-security-
>module@vger.kernel.org; linux-kernel@vger.kernel.org; tpmdd-
>devel@lists.sourceforge.net
>Subject: Re: [PATCH v6 0/2] Fix corner cases with disabling CLKRUN in tpm_tis
>
>On Wed, Nov 29, 2017 at 10:39:49AM -0800, Azhar Shaikh wrote:
>> 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.
>>
>> 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       | 121 ++++++---------------------------------
>>  drivers/char/tpm/tpm_tis_core.c  | 111
>> +++++++++++++++++++++++++++++++++--
>>  drivers/char/tpm/tpm_tis_core.h  |  17 ++++++
>>  include/linux/tpm.h              |   1 +
>>  5 files changed, 147 insertions(+), 109 deletions(-)
>>
>> --
>> 1.9.1
>
>I'll go through this next week and test with SPI based TPM that it doesn't break
>anything.
>

Sure!

Thank you!

>/Jarkko

Regards,
Azhar Shaikh

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