From: Stefan Berger <stefanb@linux.ibm.com>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc: Alexander Steffen <Alexander.Steffen@infineon.com>,
linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-security-module@vger.kernel.org,
Peter Huewe <PeterHuewe@gmx.de>, Jason Gunthorpe <jgg@ziepe.ca>,
Tomas Winkler <tomas.winkler@intel.com>,
Tadeusz Struk <tadeusz.struk@intel.com>,
Stefan Berger <stefanb@linux.vnet.ibm.com>,
Nayna Jain <nayna@linux.ibm.com>
Subject: Re: [PATCH v11 00/16] Remove nested TPM operations
Date: Thu, 7 Feb 2019 21:14:54 -0500 [thread overview]
Message-ID: <9cd734ad-ea9d-77f7-b657-3f0910a9d92f@linux.ibm.com> (raw)
In-Reply-To: <1fbd29ad-1005-8450-4c39-00974468183b@linux.ibm.com>
On 2/7/19 8:51 PM, Stefan Berger wrote:
> On 2/7/19 7:33 PM, Jarkko Sakkinen wrote:
>> On Thu, Feb 07, 2019 at 06:29:43PM -0500, Stefan Berger wrote:
>>> On 2/7/19 4:29 PM, Jarkko Sakkinen wrote:
>
>
>>
>>> diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
>>> index e74c5b7b64bf..52afe20cc8a1 100644
>>> --- a/drivers/char/tpm/tpm2-cmd.c
>>> +++ b/drivers/char/tpm/tpm2-cmd.c
>>> @@ -799,7 +799,9 @@ int tpm2_probe(struct tpm_chip *chip)
>>> tpm_buf_append_u32(&buf, TPM2_CAP_TPM_PROPERTIES);
>>> tpm_buf_append_u32(&buf, TPM_PT_TOTAL_COMMANDS);
>>> tpm_buf_append_u32(&buf, 1);
>>> + tpm_chip_start(chip);
>>> rc = tpm_transmit_cmd(chip, &buf, 0, NULL);
>>> + tpm_chip_stop(chip);
>> Thanks Stefan! I added call to tpm_tis_core as tpm2-cmd.c is to be kept
>> out of chip management common case being that you call
>> tpm_try_get_ops(),
>> do 1-N TPM commands and release with tpm_put_ops(). These functions take
>> care starting and stopping the chip.
>>
>> I fixed the 2nd issue in the master.
>
> You also need to export the tpm_chip_start/stop symbols.
>
>
> Master now seems to (still) have a problem when rmmod'ing:
>
> A TPM error (325) occurred stopping the TPM. This happens at the same
> patch where I had to add the tpm_chip_start/stop above.
>
>
Here's my current overall patch against your master. I suppose the other
tpm2_shutdown() for power management doesn't need the chip start ?
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 9865776ee2cd..f7147706a9c3 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -115,6 +115,7 @@ int tpm_chip_start(struct tpm_chip *chip)
return 0;
}
+EXPORT_SYMBOL_GPL(tpm_chip_start);
/**
* tpm_chip_stop() - power off the TPM
@@ -131,7 +132,7 @@ void tpm_chip_stop(struct tpm_chip *chip)
if (chip->ops->clk_enable)
chip->ops->clk_enable(chip, false);
}
-
+EXPORT_SYMBOL_GPL(tpm_chip_stop);
/**
* tpm_try_get_ops() - Get a ref to the tpm_chip
@@ -474,8 +475,11 @@ static void tpm_del_char_device(struct tpm_chip *chip)
/* Make the driver uncallable. */
down_write(&chip->ops_sem);
- if (chip->flags & TPM_CHIP_FLAG_TPM2)
+ if (chip->flags & TPM_CHIP_FLAG_TPM2) {
+ tpm_chip_start(chip, 0);
tpm2_shutdown(chip, TPM2_SU_CLEAR);
+ tpm_chip_stop(chip, 0);
+ }
chip->ops = NULL;
up_write(&chip->ops_sem);
}
diff --git a/drivers/char/tpm/tpm-interface.c
b/drivers/char/tpm/tpm-interface.c
index 02e8cffd1163..fcd845ad8c3c 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -124,6 +124,8 @@ static ssize_t tpm_try_transmit(struct tpm_chip
*chip, void *buf, size_t bufsiz)
dev_err(&chip->dev, "tpm_transmit: tpm_recv: error %d\n", rc);
} else if (len < TPM_HEADER_SIZE || len !=
be32_to_cpu(header->length))
rc = -EFAULT;
+ else
+ rc = 0;
return rc ? rc : len;
}
>
>
>>
>> /Jarkko
>>
>
next prev parent reply other threads:[~2019-02-08 2:15 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-05 22:47 [PATCH v11 00/16] Remove nested TPM operations Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 01/16] tpm: use tpm_buf in tpm_transmit_cmd() as the IO parameter Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 02/16] tpm: fix invalid return value in pubek_show() Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 03/16] tpm: return 0 from pcrs_show() when tpm1_pcr_read() fails Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 04/16] tpm: print tpm2_commit_space() error inside tpm2_commit_space() Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 05/16] tpm: declare struct tpm_header Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 06/16] tpm: access command header through struct in tpm_try_transmit() Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 07/16] tpm: encapsulate tpm_dev_transmit() Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 08/16] tpm: clean up tpm_try_transmit() error handling flow Jarkko Sakkinen
2019-02-07 23:36 ` Stefan Berger
2019-02-05 22:47 ` [PATCH v11 09/16] tpm: move tpm_validate_commmand() to tpm2-space.c Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 10/16] tpm: move TPM space code out of tpm_transmit() Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 11/16] tpm: remove @space from tpm_transmit() Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 12/16] tpm: use tpm_try_get_ops() in tpm-sysfs.c Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 13/16] tpm: remove TPM_TRANSMIT_UNLOCKED flag Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 14/16] tpm: introduce tpm_chip_start() and tpm_chip_stop() Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 15/16] tpm: take TPM chip power gating out of tpm_transmit() Jarkko Sakkinen
2019-02-07 23:32 ` Stefan Berger
2019-02-08 0:02 ` Jerry Snitselaar
2019-02-05 22:47 ` [PATCH v11 16/16] tpm: remove @flags from tpm_transmit() Jarkko Sakkinen
2019-02-06 12:06 ` [PATCH v11 00/16] Remove nested TPM operations Jarkko Sakkinen
2019-02-07 18:41 ` Alexander Steffen
2019-02-07 21:14 ` Stefan Berger
2019-02-07 21:29 ` Jarkko Sakkinen
2019-02-07 23:29 ` Stefan Berger
2019-02-08 0:33 ` Jarkko Sakkinen
2019-02-08 1:51 ` Stefan Berger
2019-02-08 2:14 ` Stefan Berger [this message]
2019-02-08 11:50 ` Jarkko Sakkinen
2019-02-08 12:22 ` Stefan Berger
2019-02-08 13:12 ` Jarkko Sakkinen
2019-02-08 13:28 ` Alexander Steffen
2019-02-08 14:09 ` Jarkko Sakkinen
2019-02-08 18:02 ` Alexander Steffen
2019-02-08 11:14 ` Jarkko Sakkinen
2019-02-08 12:05 ` Stefan Berger
2019-02-08 13:02 ` Jarkko Sakkinen
2019-02-08 13:10 ` Stefan Berger
2019-02-08 13:17 ` Jarkko Sakkinen
2019-02-08 13:33 ` Jarkko Sakkinen
2019-02-08 14:02 ` Stefan Berger
2019-02-08 14:08 ` Jarkko Sakkinen
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