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  1. 12 Jul, 2011 11 commits
    • Stefan Berger's avatar
      tpm_tis: Probing function for Intel iTPM bug · 9519de3f
      Stefan Berger authored 
      This patch introduces a function for automatic probing for the Intel iTPM
STS_DATA_EXPECT flaw.

The patch splits the current tpm_tis_send function into 2 parts where the 1st
part is now called tpm_tis_send_data() and merely sends the data to the TPM.
This function is then used for probing. The new tpm_tis_send function now
first calls tpm_tis_send_data and if that succeeds has the TPM process the
command and waits until the response is there.

The probing for the Intel iTPM is only invoked if the user has not passed
itpm=1 as parameter for the module *or* if such a TPM was detected via ACPI.
Previously it was necessary to pass itpm=1 when also passing force=1 to the
module when doing a 'modprobe'. This function is more general than the ACPI
test function and the function relying on ACPI could probably be removed.
Signed-off-by: default avatarStefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: default avatarRajiv Andrade <srajiv@linux.vnet.ibm.com>
      9519de3f
    • Stefan Berger's avatar
      tpm_tis: Fix the probing for interrupts · a7b66822
      Stefan Berger authored 
      This patch fixes several aspects of the probing for interrupts.

This patch reads the TPM's timeouts before probing for the interrupts. The
tpm_get_timeouts() function is invoked in polling mode and gets the proper
timeouts from the TPM so that we don't need to fall back to 2 minutes timeouts
for short duration commands while the interrupt probing is happening.

This patch introduces a variable probed_irq into the vendor structure that gets
the irq number if an interrupt is received while the the tpm_gen_interrupt()
function is run in polling mode during interrupt probing. Previously some
parts of tpm_gen_interrupt() were run in polling mode, then the irq variable
was set in the interrupt handler when an interrupt was received and execution
of tpm_gen_interrupt() ended up switching over to interrupt mode.
tpm_gen_interrupt() execution ended up on an event queue where it eventually
timed out since the probing handler doesn't wake any queues.

Before calling into free_irq() clear all interrupt flags that may have
been set by the TPM. The reason is that free_irq() will call into the probing
interrupt handler and may otherwise fool us into thinking that a real interrupt
happened (because we see the flags as being set) while the TPM's interrupt line
is not even connected to anything on the motherboard. This solves a problem
on one machine I did testing on (Thinkpad T60).

If a TPM claims to use a specifc interrupt, the probing is done as well
to verify that the interrupt is actually working. If a TPM indicates
that it does not use a specific interrupt (returns '0'), probe all interrupts
from 3 to 15.
Signed-off-by: default avatarStefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: default avatarRajiv Andrade <srajiv@linux.vnet.ibm.com>
      a7b66822
    • Stefan Berger's avatar
      tpm_tis: Delay ACPI S3 suspend while the TPM is busy · 20b87bbf
      Stefan Berger authored 
      This patch delays the (ACPI S3) suspend while the TPM is busy processing a
command and the TPM TIS driver is run in interrupt mode. This is the same
behavior as we already have it for the TPM TIS driver in polling mode.

Reasoning: Some of the TPM's commands advance the internal state of the TPM.
An example would be the extending of one of its PCR registers. Upper layers,
such as IMA or TSS (TrouSerS), would certainly want to be sure that the
command succeeded rather than getting an error code (-62 = -ETIME) that may
not give a conclusive answer as for what reason the command failed. Reissuing
such a command would put the TPM into the wrong state, so waiting for it to
finish is really the only option.

The downside is that some commands (key creation) can take a long time and
actually prevent the machine from entering S3 at all before the 20 second
timeout of the power management subsystem arrives.
Signed-off-by: default avatarStefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: default avatarRajiv Andrade <srajiv@linux.vnet.ibm.com>
      20b87bbf
    • Stefan Berger's avatar
      tpm_tis: Re-enable interrupts upon (S3) resume · 45baa1d1
      Stefan Berger authored 
      This patch makes sure that if the TPM TIS interface is run in interrupt mode
(rather than polling mode) that all interrupts are enabled in the TPM's
interrupt enable register after a resume from ACPI S3 suspend. The registers
may either have been cleared by the TPM loosing its state during device sleep
or by the BIOS leaving the TPM in polling mode (after sending a command to
the TPM for starting it up again)

You may want to check if your TPM runs with interrupts by doing

cat /proc/interrupts | grep -i tpm

and see whether there is an entry or otherwise for it to use interrupts:

modprobe tpm_tis interrupts=1 [add 'itpm=1' for Intel TPM ]

v2:
  - the patch was adapted to work with the pnp and platform driver
    implementations in tpm_tis.c
Signed-off-by: default avatarStefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: default avatarRajiv Andrade <srajiv@linux.vnet.ibm.com>
      45baa1d1
    • Stefan Berger's avatar
      tpm: Fix display of data in pubek sysfs entry · 5a79444f
      Stefan Berger authored 
      This patch fixes the TPM's pubek sysfs entry that is accessible as long
as the TPM doesn't have an owner. It was necessary to shift the access to the
data by -10 -- the first byte immediately follows the 10 byte header. The
line

 	data = tpm_cmd.params.readpubek_out_buffer;

sets it at the offset '10' in the packet, so we can read the data array
starting at offset '0'.

Before:

Algorithm: 00 0C 00 00
Encscheme: 08 00
Sigscheme: 00 00
Parameters: 00 00 00 00 01 00 AC E2 5E 3C A0 78
Modulus length: -563306801
Modulus:
28 21 08 0F 82 CD F2 B1 E7 49 F7 74 70 BE 59 8C
43 78 B1 24 EA 52 E2 FE 52 5C 3A 12 3B DC 61 71
[...]

After:

Algorithm: 00 00 00 01
Encscheme: 00 03
Sigscheme: 00 01
Parameters: 00 00 08 00 00 00 00 02 00 00 00 00
Modulus length: 256
Modulus:
AC E2 5E 3C A0 78 DE 6C 9E CF 28 21 08 0F 82 CD
F2 B1 E7 49 F7 74 70 BE 59 8C 43 78 B1 24 EA 52
[...]
Signed-off-by: default avatarStefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: default avatarRajiv Andrade <srajiv@linux.vnet.ibm.com>
      5a79444f
    • Stefan Berger's avatar
      tpm_tis: Add timeouts sysfs entry · 62592101
      Stefan Berger authored 
      Display the TPM's interface timeouts in a 'timeouts' sysfs entry. Display
the entries as having been adjusted when they were scaled due to their values
being reported in milliseconds rather than microseconds.
Signed-off-by: default avatarStefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: default avatarRajiv Andrade <srajiv@linux.vnet.ibm.com>
      62592101
    • Stefan Berger's avatar
      tpm: Adjust interface timeouts if they are too small · e3e1a1e1
      Stefan Berger authored 
      Adjust the interface timeouts if they are found to be too small, i.e., if
they are returned in milliseconds rather than microseconds as we heared
from Infineon that some (old) Infineon TPMs do.
Signed-off-by: default avatarStefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: default avatarRajiv Andrade <srajiv@linux.vnet.ibm.com>
      e3e1a1e1
    • Stefan Berger's avatar
      tpm: Use interface timeouts returned from the TPM · 829bf067
      Stefan Berger authored 
      The TPM driver currently discards the interface timeout values returned
from the TPM. The check of the response packet needs to consider that
the return_code field is 0 on success and the size of the expected
packet is equivalent to the header size + u32 length indicator for the
TPM_GetCapability() result + 4 interface timeout indicators of type u32.
Signed-off-by: default avatarStefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: default avatarRajiv Andrade <srajiv@linux.vnet.ibm.com>
      829bf067
    • Stefan Berger's avatar
      tpm_tis: Introduce durations sysfs entry · 04ab2293
      Stefan Berger authored 
      Display the TPM's command timeouts in a 'durations' sysfs entry. Display
the entries as having been adjusted when they were scaled due to their values
being reported in milliseconds rather than microseconds.
Signed-off-by: default avatarStefan Berger <stefanb@linux.vnet.ibm.com>
Tested-by: default avatarGuillaume Chazarain <guichaz@gmail.com>
Signed-off-by: default avatarRajiv Andrade <srajiv@linux.vnet.ibm.com>
      04ab2293
    • Stefan Berger's avatar
      tpm: Adjust the durations if they are too small · e934acca
      Stefan Berger authored 
      Adjust the durations if they are found to be too small, i.e., if they are
returned in milliseconds rather than microseconds as some Infineon TPMs are
reported to do.
Signed-off-by: default avatarStefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: default avatarRajiv Andrade <srajiv@linux.vnet.ibm.com>
      e934acca
    • Stefan Berger's avatar
      tpm: Use durations returned from TPM · 979b1406
      Stefan Berger authored 
      The TPM driver currently discards the durations values returned
from the TPM. The check of the response packet needs to consider that
the return_code field is 0 on success and the size of the expected
packet is equivalent to the header size + u32 length indicator for the
TPM_GetCapability() result + 3 timeout indicators of type u32.

v4:
- sysfs entry 'durations' is now a patch of its own
- the work-around for TPMs reporting durations in milliseconds is now in a
  patch of its own

v3:
- sysfs entry now called 'durations' to resemble TPM-speak (previously
  was called 'timeouts')

v2:
- adjusting all timeouts for TPM devices reporting timeouts in msec rather
  than usec
- also displaying in sysfs whether the timeouts are 'original' or 'adjusted'
Signed-off-by: default avatarStefan Berger <stefanb@linux.vnet.ibm.com>
Tested-by: default avatarGuillaume Chazarain <guichaz@gmail.com>
Signed-off-by: default avatarRajiv Andrade <srajiv@linux.vnet.ibm.com>
      979b1406
  3. 11 Jul, 2011 5 commits
  5. 07 Jul, 2011 1 commit
  7. 30 Jun, 2011 7 commits
  9. 29 Jun, 2011 11 commits
  11. 28 Jun, 2011 5 commits
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