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[SeaBIOS] [PATCH v1 2/3] tpm: Wait for interface startup when probing

Stephen Douthit posted 3 patches 7 years, 2 months ago
[SeaBIOS] [PATCH v1 2/3] tpm: Wait for interface startup when probing
Posted by Stephen Douthit 7 years, 2 months ago 
This is based on wait_startup() from the Linux tpm_tis driver.

Signed-off-by: Stephen Douthit <stephend@silicom-usa.com>
Tested-by: Stephen Douthit <stephend@silicom-usa.com>
---
 src/hw/tpm_drivers.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/hw/tpm_drivers.c b/src/hw/tpm_drivers.c
index 13ad821..da8bb63 100644
--- a/src/hw/tpm_drivers.c
+++ b/src/hw/tpm_drivers.c
@@ -86,6 +86,11 @@ static u32 wait_reg8(u8* reg, u32 time, u8 mask, u8 expect)
     return rc;
 }
 
+static u32 tis_wait_access(u8 locty, u32 time, u8 mask, u8 expect)
+{
+    return wait_reg8(TIS_REG(locty, TIS_REG_ACCESS), time, mask, expect);
+}
+
 static u32 tis_wait_sts(u8 locty, u32 time, u8 mask, u8 expect)
 {
     return wait_reg8(TIS_REG(locty, TIS_REG_STS), time, mask, expect);
@@ -102,7 +107,13 @@ static u32 tis_probe(void)
     if (!CONFIG_TCGBIOS)
         return 0;
 
-    u32 rc = 0;
+    /* Wait for the interface to report it's ready */
+    u32 rc = tis_wait_access(0, TIS_DEFAULT_TIMEOUT_A,
+                             TIS_ACCESS_TPM_REG_VALID_STS,
+                             TIS_ACCESS_TPM_REG_VALID_STS);
+    if (rc)
+        return 0;
+
     u32 didvid = readl(TIS_REG(0, TIS_REG_DID_VID));
 
     if ((didvid != 0) && (didvid != 0xffffffff))
-- 
2.14.3


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Re: [SeaBIOS] [PATCH v1 2/3] tpm: Wait for interface startup when probing
Posted by Kevin O'Connor 7 years, 2 months ago 
On Tue, Feb 27, 2018 at 02:17:10PM -0500, Stephen Douthit wrote:
> This is based on wait_startup() from the Linux tpm_tis driver.
> 
> Signed-off-by: Stephen Douthit <stephend@silicom-usa.com>
> Tested-by: Stephen Douthit <stephend@silicom-usa.com>
> ---
>  src/hw/tpm_drivers.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/src/hw/tpm_drivers.c b/src/hw/tpm_drivers.c
> index 13ad821..da8bb63 100644
> --- a/src/hw/tpm_drivers.c
> +++ b/src/hw/tpm_drivers.c
> @@ -86,6 +86,11 @@ static u32 wait_reg8(u8* reg, u32 time, u8 mask, u8 expect)
>      return rc;
>  }
>  
> +static u32 tis_wait_access(u8 locty, u32 time, u8 mask, u8 expect)
> +{
> +    return wait_reg8(TIS_REG(locty, TIS_REG_ACCESS), time, mask, expect);
> +}
> +
>  static u32 tis_wait_sts(u8 locty, u32 time, u8 mask, u8 expect)
>  {
>      return wait_reg8(TIS_REG(locty, TIS_REG_STS), time, mask, expect);
> @@ -102,7 +107,13 @@ static u32 tis_probe(void)
>      if (!CONFIG_TCGBIOS)
>          return 0;
>  
> -    u32 rc = 0;
> +    /* Wait for the interface to report it's ready */
> +    u32 rc = tis_wait_access(0, TIS_DEFAULT_TIMEOUT_A,
> +                             TIS_ACCESS_TPM_REG_VALID_STS,
> +                             TIS_ACCESS_TPM_REG_VALID_STS);
> +    if (rc)
> +        return 0;
> +

Thanks.  I was about to commit this when I noticed the above.  In the
case where tis_wait_access() fails due to a timeout, shouldn't
tis_probe() return an error indicator instead of success?

-Kevin

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Re: [SeaBIOS] [PATCH v1 2/3] tpm: Wait for interface startup when probing
Posted by Stephen Douthit 7 years, 2 months ago 
On 03/02/2018 11:05 AM, Kevin O'Connor wrote:
> On Tue, Feb 27, 2018 at 02:17:10PM -0500, Stephen Douthit wrote:
>> This is based on wait_startup() from the Linux tpm_tis driver.
>>
>> Signed-off-by: Stephen Douthit <stephend@silicom-usa.com>
>> Tested-by: Stephen Douthit <stephend@silicom-usa.com>
>> ---
>>   src/hw/tpm_drivers.c | 13 ++++++++++++-
>>   1 file changed, 12 insertions(+), 1 deletion(-)
>>
>> diff --git a/src/hw/tpm_drivers.c b/src/hw/tpm_drivers.c
>> index 13ad821..da8bb63 100644
>> --- a/src/hw/tpm_drivers.c
>> +++ b/src/hw/tpm_drivers.c
>> @@ -86,6 +86,11 @@ static u32 wait_reg8(u8* reg, u32 time, u8 mask, u8 expect)
>>       return rc;
>>   }
>>   
>> +static u32 tis_wait_access(u8 locty, u32 time, u8 mask, u8 expect)
>> +{
>> +    return wait_reg8(TIS_REG(locty, TIS_REG_ACCESS), time, mask, expect);
>> +}
>> +
>>   static u32 tis_wait_sts(u8 locty, u32 time, u8 mask, u8 expect)
>>   {
>>       return wait_reg8(TIS_REG(locty, TIS_REG_STS), time, mask, expect);
>> @@ -102,7 +107,13 @@ static u32 tis_probe(void)
>>       if (!CONFIG_TCGBIOS)
>>           return 0;
>>   
>> -    u32 rc = 0;
>> +    /* Wait for the interface to report it's ready */
>> +    u32 rc = tis_wait_access(0, TIS_DEFAULT_TIMEOUT_A,
>> +                             TIS_ACCESS_TPM_REG_VALID_STS,
>> +                             TIS_ACCESS_TPM_REG_VALID_STS);
>> +    if (rc)
>> +        return 0;
>> +
> 
> Thanks.  I was about to commit this when I noticed the above.  In the
> case where tis_wait_access() fails due to a timeout, shouldn't
> tis_probe() return an error indicator instead of success?

tis_probe() returns 0 for no device, '1' for device present.

Take a look at the usage in tpmhw_probe(), or the comment on
tis_probe() itself.

Thanks,
Steve

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Re: [SeaBIOS] [PATCH v1 2/3] tpm: Wait for interface startup when probing
Posted by Kevin O'Connor 7 years, 2 months ago 
On Fri, Mar 02, 2018 at 11:27:46AM -0500, Stephen Douthit wrote:
> On 03/02/2018 11:05 AM, Kevin O'Connor wrote:
> > On Tue, Feb 27, 2018 at 02:17:10PM -0500, Stephen Douthit wrote:
> > > This is based on wait_startup() from the Linux tpm_tis driver.
> > > 
> > > Signed-off-by: Stephen Douthit <stephend@silicom-usa.com>
> > > Tested-by: Stephen Douthit <stephend@silicom-usa.com>
> > > ---
> > >   src/hw/tpm_drivers.c | 13 ++++++++++++-
> > >   1 file changed, 12 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/src/hw/tpm_drivers.c b/src/hw/tpm_drivers.c
> > > index 13ad821..da8bb63 100644
> > > --- a/src/hw/tpm_drivers.c
> > > +++ b/src/hw/tpm_drivers.c
> > > @@ -86,6 +86,11 @@ static u32 wait_reg8(u8* reg, u32 time, u8 mask, u8 expect)
> > >       return rc;
> > >   }
> > > +static u32 tis_wait_access(u8 locty, u32 time, u8 mask, u8 expect)
> > > +{
> > > +    return wait_reg8(TIS_REG(locty, TIS_REG_ACCESS), time, mask, expect);
> > > +}
> > > +
> > >   static u32 tis_wait_sts(u8 locty, u32 time, u8 mask, u8 expect)
> > >   {
> > >       return wait_reg8(TIS_REG(locty, TIS_REG_STS), time, mask, expect);
> > > @@ -102,7 +107,13 @@ static u32 tis_probe(void)
> > >       if (!CONFIG_TCGBIOS)
> > >           return 0;
> > > -    u32 rc = 0;
> > > +    /* Wait for the interface to report it's ready */
> > > +    u32 rc = tis_wait_access(0, TIS_DEFAULT_TIMEOUT_A,
> > > +                             TIS_ACCESS_TPM_REG_VALID_STS,
> > > +                             TIS_ACCESS_TPM_REG_VALID_STS);
> > > +    if (rc)
> > > +        return 0;
> > > +
> > 
> > Thanks.  I was about to commit this when I noticed the above.  In the
> > case where tis_wait_access() fails due to a timeout, shouldn't
> > tis_probe() return an error indicator instead of success?
> 
> tis_probe() returns 0 for no device, '1' for device present.
> 
> Take a look at the usage in tpmhw_probe(), or the comment on
> tis_probe() itself.

Okay, thanks for clarifying.

-Kevin

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Re: [SeaBIOS] [PATCH v1 2/3] tpm: Wait for interface startup when probing
Posted by Stefan Berger 7 years, 2 months ago 
On 02/27/2018 02:17 PM, Stephen Douthit wrote:
> This is based on wait_startup() from the Linux tpm_tis driver.
>
> Signed-off-by: Stephen Douthit <stephend@silicom-usa.com>
> Tested-by: Stephen Douthit <stephend@silicom-usa.com>
Reviewed-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
> ---
>   src/hw/tpm_drivers.c | 13 ++++++++++++-
>   1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/src/hw/tpm_drivers.c b/src/hw/tpm_drivers.c
> index 13ad821..da8bb63 100644
> --- a/src/hw/tpm_drivers.c
> +++ b/src/hw/tpm_drivers.c
> @@ -86,6 +86,11 @@ static u32 wait_reg8(u8* reg, u32 time, u8 mask, u8 expect)
>       return rc;
>   }
>
> +static u32 tis_wait_access(u8 locty, u32 time, u8 mask, u8 expect)
> +{
> +    return wait_reg8(TIS_REG(locty, TIS_REG_ACCESS), time, mask, expect);
> +}
> +
>   static u32 tis_wait_sts(u8 locty, u32 time, u8 mask, u8 expect)
>   {
>       return wait_reg8(TIS_REG(locty, TIS_REG_STS), time, mask, expect);
> @@ -102,7 +107,13 @@ static u32 tis_probe(void)
>       if (!CONFIG_TCGBIOS)
>           return 0;
>
> -    u32 rc = 0;
> +    /* Wait for the interface to report it's ready */
> +    u32 rc = tis_wait_access(0, TIS_DEFAULT_TIMEOUT_A,
> +                             TIS_ACCESS_TPM_REG_VALID_STS,
> +                             TIS_ACCESS_TPM_REG_VALID_STS);
> +    if (rc)
> +        return 0;
> +
>       u32 didvid = readl(TIS_REG(0, TIS_REG_DID_VID));
>
>       if ((didvid != 0) && (didvid != 0xffffffff))



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