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Groups > linux.kernel > #1592100 > unrolled thread
| Started by | Enric Balletbo i Serra <enric.balletbo@collabora.com> |
|---|---|
| First post | 2017-03-03 17:20 +0100 |
| Last post | 2017-03-12 15:40 +0100 |
| Articles | 8 — 4 participants |
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[PATCH v3] tpm: do not suspend/resume if power stays on Enric Balletbo i Serra <enric.balletbo@collabora.com> - 2017-03-03 17:20 +0100
Re: [PATCH v3] tpm: do not suspend/resume if power stays on Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-03-03 18:20 +0100
Re: [PATCH v3] tpm: do not suspend/resume if power stays on Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-03-06 15:50 +0100
Re: [PATCH v3] tpm: do not suspend/resume if power stays on Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-03-06 22:10 +0100
Re: [PATCH v3] tpm: do not suspend/resume if power stays on Enric Balletbo i Serra <enric.balletbo@collabora.com> - 2017-03-07 10:30 +0100
Re: [PATCH v3] tpm: do not suspend/resume if power stays on Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-03-07 20:00 +0100
Re: [PATCH v3] tpm: do not suspend/resume if power stays on Rob Herring <robh@kernel.org> - 2017-03-12 15:30 +0100
Re: [PATCH v3] tpm: do not suspend/resume if power stays on Rob Herring <robh@kernel.org> - 2017-03-12 15:40 +0100
| From | Enric Balletbo i Serra <enric.balletbo@collabora.com> |
|---|---|
| Date | 2017-03-03 17:20 +0100 |
| Subject | [PATCH v3] tpm: do not suspend/resume if power stays on |
| Message-ID | <tgY5X-3H1-3@gated-at.bofh.it> |
From: Sonny Rao <sonnyrao@chromium.org>
The suspend/resume behavior of the TPM can be controlled by setting
"powered-while-suspended" in the DTS. This is useful for the cases
when hardware does not power-off the TPM.
Signed-off-by: Sonny Rao <sonnyrao@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
---
Changes since v2:
Jarkko Sakkinen
- Add a new TPM_CHIP_FLAG_ALWAYS_POWERED flag instead of using a boolean variable.
- Remove a trailing newline.
Changes since v1:
Jason Gunthorpe :
- Move the code to handle suspend/resume in the common chip code.
Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt | 6 ++++++
drivers/char/tpm/tpm-interface.c | 3 +++
drivers/char/tpm/tpm.h | 1 +
drivers/char/tpm/tpm_of.c | 3 +++
4 files changed, 13 insertions(+)
diff --git a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt
index 8cb638b..85c8216 100644
--- a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt
+++ b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt
@@ -8,6 +8,12 @@ Required properties:
the firmware event log
- linux,sml-size : size of the memory allocated for the firmware event log
+Optional properties:
+
+- powered-while-suspended: present when the TPM is left powered on between
+ suspend and resume (makes the suspend/resume
+ callbacks do nothing).
+
Example (for OpenPower Systems with Nuvoton TPM 2.0 on I2C)
----------------------------------------------------------
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index a2688ac..6869093 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -944,6 +944,9 @@ int tpm_pm_suspend(struct device *dev)
if (chip == NULL)
return -ENODEV;
+ if (chip->flags & TPM_CHIP_FLAG_ALWAYS_POWERED)
+ return 0;
+
if (chip->flags & TPM_CHIP_FLAG_TPM2) {
tpm2_shutdown(chip, TPM2_SU_STATE);
return 0;
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 1ae9768..0ce379c 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -146,6 +146,7 @@ enum tpm_chip_flags {
TPM_CHIP_FLAG_IRQ = BIT(2),
TPM_CHIP_FLAG_VIRTUAL = BIT(3),
TPM_CHIP_FLAG_HAVE_TIMEOUTS = BIT(4),
+ TPM_CHIP_FLAG_ALWAYS_POWERED = BIT(5),
};
struct tpm_chip_seqops {
diff --git a/drivers/char/tpm/tpm_of.c b/drivers/char/tpm/tpm_of.c
index 7dee42d7..e89276c 100644
--- a/drivers/char/tpm/tpm_of.c
+++ b/drivers/char/tpm/tpm_of.c
@@ -34,6 +34,9 @@ int tpm_read_log_of(struct tpm_chip *chip)
else
return -ENODEV;
+ if (of_property_read_bool(np, "powered-while-suspended"))
+ chip->flags |= TPM_CHIP_FLAG_ALWAYS_POWERED;
+
sizep = of_get_property(np, "linux,sml-size", NULL);
basep = of_get_property(np, "linux,sml-base", NULL);
if (sizep == NULL && basep == NULL)
--
2.9.3
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| From | Jason Gunthorpe <jgunthorpe@obsidianresearch.com> |
|---|---|
| Date | 2017-03-03 18:20 +0100 |
| Message-ID | <tgZ22-4jz-17@gated-at.bofh.it> |
| In reply to | #1592100 |
On Fri, Mar 03, 2017 at 05:09:59PM +0100, Enric Balletbo i Serra wrote: > From: Sonny Rao <sonnyrao@chromium.org> > > The suspend/resume behavior of the TPM can be controlled by setting > "powered-while-suspended" in the DTS. This is useful for the cases > when hardware does not power-off the TPM. > > Signed-off-by: Sonny Rao <sonnyrao@chromium.org> > Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> > +++ b/drivers/char/tpm/tpm_of.c > @@ -34,6 +34,9 @@ int tpm_read_log_of(struct tpm_chip *chip) > else > return -ENODEV; > > + if (of_property_read_bool(np, "powered-while-suspended")) > + chip->flags |= TPM_CHIP_FLAG_ALWAYS_POWERED; > + It is really weird that this is in a function called tpm_read_log_of, but it makes sense to use the existing conditional infrastructure for OF as well. We should try to tidy this later... Jason
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| From | Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> |
|---|---|
| Date | 2017-03-06 15:50 +0100 |
| Message-ID | <ti27v-199-5@gated-at.bofh.it> |
| In reply to | #1592100 |
On Fri, Mar 03, 2017 at 05:09:59PM +0100, Enric Balletbo i Serra wrote:
> From: Sonny Rao <sonnyrao@chromium.org>
>
> The suspend/resume behavior of the TPM can be controlled by setting
> "powered-while-suspended" in the DTS. This is useful for the cases
> when hardware does not power-off the TPM.
>
> Signed-off-by: Sonny Rao <sonnyrao@chromium.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Thanks. Looks good to me.
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
/Jarkko
> ---
> Changes since v2:
> Jarkko Sakkinen
> - Add a new TPM_CHIP_FLAG_ALWAYS_POWERED flag instead of using a boolean variable.
> - Remove a trailing newline.
> Changes since v1:
> Jason Gunthorpe :
> - Move the code to handle suspend/resume in the common chip code.
>
> Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt | 6 ++++++
> drivers/char/tpm/tpm-interface.c | 3 +++
> drivers/char/tpm/tpm.h | 1 +
> drivers/char/tpm/tpm_of.c | 3 +++
> 4 files changed, 13 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt
> index 8cb638b..85c8216 100644
> --- a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt
> +++ b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt
> @@ -8,6 +8,12 @@ Required properties:
> the firmware event log
> - linux,sml-size : size of the memory allocated for the firmware event log
>
> +Optional properties:
> +
> +- powered-while-suspended: present when the TPM is left powered on between
> + suspend and resume (makes the suspend/resume
> + callbacks do nothing).
> +
> Example (for OpenPower Systems with Nuvoton TPM 2.0 on I2C)
> ----------------------------------------------------------
>
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index a2688ac..6869093 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -944,6 +944,9 @@ int tpm_pm_suspend(struct device *dev)
> if (chip == NULL)
> return -ENODEV;
>
> + if (chip->flags & TPM_CHIP_FLAG_ALWAYS_POWERED)
> + return 0;
> +
> if (chip->flags & TPM_CHIP_FLAG_TPM2) {
> tpm2_shutdown(chip, TPM2_SU_STATE);
> return 0;
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index 1ae9768..0ce379c 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -146,6 +146,7 @@ enum tpm_chip_flags {
> TPM_CHIP_FLAG_IRQ = BIT(2),
> TPM_CHIP_FLAG_VIRTUAL = BIT(3),
> TPM_CHIP_FLAG_HAVE_TIMEOUTS = BIT(4),
> + TPM_CHIP_FLAG_ALWAYS_POWERED = BIT(5),
> };
>
> struct tpm_chip_seqops {
> diff --git a/drivers/char/tpm/tpm_of.c b/drivers/char/tpm/tpm_of.c
> index 7dee42d7..e89276c 100644
> --- a/drivers/char/tpm/tpm_of.c
> +++ b/drivers/char/tpm/tpm_of.c
> @@ -34,6 +34,9 @@ int tpm_read_log_of(struct tpm_chip *chip)
> else
> return -ENODEV;
>
> + if (of_property_read_bool(np, "powered-while-suspended"))
> + chip->flags |= TPM_CHIP_FLAG_ALWAYS_POWERED;
> +
> sizep = of_get_property(np, "linux,sml-size", NULL);
> basep = of_get_property(np, "linux,sml-base", NULL);
> if (sizep == NULL && basep == NULL)
> --
> 2.9.3
>
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| From | Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> |
|---|---|
| Date | 2017-03-06 22:10 +0100 |
| Message-ID | <ti83f-5wO-3@gated-at.bofh.it> |
| In reply to | #1592100 |
On Fri, Mar 03, 2017 at 05:09:59PM +0100, Enric Balletbo i Serra wrote: > From: Sonny Rao <sonnyrao@chromium.org> > > The suspend/resume behavior of the TPM can be controlled by setting > "powered-while-suspended" in the DTS. This is useful for the cases > when hardware does not power-off the TPM. > > Signed-off-by: Sonny Rao <sonnyrao@chromium.org> > Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> > --- > Changes since v2: > Jarkko Sakkinen > - Add a new TPM_CHIP_FLAG_ALWAYS_POWERED flag instead of using a boolean variable. > - Remove a trailing newline. > Changes since v1: > Jason Gunthorpe : > - Move the code to handle suspend/resume in the common chip code. > > Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt | 6 ++++++ > drivers/char/tpm/tpm-interface.c | 3 +++ > drivers/char/tpm/tpm.h | 1 + > drivers/char/tpm/tpm_of.c | 3 +++ > 4 files changed, 13 insertions(+) > > diff --git a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt > index 8cb638b..85c8216 100644 > --- a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt > +++ b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt > @@ -8,6 +8,12 @@ Required properties: > the firmware event log > - linux,sml-size : size of the memory allocated for the firmware event log > > +Optional properties: > + > +- powered-while-suspended: present when the TPM is left powered on between > + suspend and resume (makes the suspend/resume > + callbacks do nothing). > + > Example (for OpenPower Systems with Nuvoton TPM 2.0 on I2C) > ---------------------------------------------------------- Hey, just noticed something. Shouldn't this be a separate commit? I'm also wondering whether this can be submitted through my tree upper maintainers. Does not change my reviewed-by for the actual code change but you would have to split this into a patch set if this is the case. /Jarkko
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| From | Enric Balletbo i Serra <enric.balletbo@collabora.com> |
|---|---|
| Date | 2017-03-07 10:30 +0100 |
| Message-ID | <tijBo-5s7-9@gated-at.bofh.it> |
| In reply to | #1593729 |
Hi Jarkko, On 06/03/17 21:59, Jarkko Sakkinen wrote: > On Fri, Mar 03, 2017 at 05:09:59PM +0100, Enric Balletbo i Serra wrote: >> From: Sonny Rao <sonnyrao@chromium.org> >> >> The suspend/resume behavior of the TPM can be controlled by setting >> "powered-while-suspended" in the DTS. This is useful for the cases >> when hardware does not power-off the TPM. >> >> Signed-off-by: Sonny Rao <sonnyrao@chromium.org> >> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> >> --- >> Changes since v2: >> Jarkko Sakkinen >> - Add a new TPM_CHIP_FLAG_ALWAYS_POWERED flag instead of using a boolean variable. >> - Remove a trailing newline. >> Changes since v1: >> Jason Gunthorpe : >> - Move the code to handle suspend/resume in the common chip code. >> >> Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt | 6 ++++++ >> drivers/char/tpm/tpm-interface.c | 3 +++ >> drivers/char/tpm/tpm.h | 1 + >> drivers/char/tpm/tpm_of.c | 3 +++ >> 4 files changed, 13 insertions(+) >> >> diff --git a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt >> index 8cb638b..85c8216 100644 >> --- a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt >> +++ b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt >> @@ -8,6 +8,12 @@ Required properties: >> the firmware event log >> - linux,sml-size : size of the memory allocated for the firmware event log >> >> +Optional properties: >> + >> +- powered-while-suspended: present when the TPM is left powered on between >> + suspend and resume (makes the suspend/resume >> + callbacks do nothing). >> + >> Example (for OpenPower Systems with Nuvoton TPM 2.0 on I2C) >> ---------------------------------------------------------- > > Hey, just noticed something. Shouldn't this be a separate commit? During my life submitting patches I saw the both options, sometimes the maintainer asked me to join the DT patch and the driver and sometimes he asked me to do in different patches, so I think this is more a maintainer option. Maybe Rob Herring or Mark Rutland can share their preferences? I'll do what you want I do, TBH I don't have a strong opinion about this. > I'm also wondering whether this can be submitted through my tree > upper maintainers. > > Does not change my reviewed-by for the actual code change but you > would have to split this into a patch set if this is the case. > > /Jarkko > Cheers, Enric
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| From | Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> |
|---|---|
| Date | 2017-03-07 20:00 +0100 |
| Message-ID | <tisv1-3b1-17@gated-at.bofh.it> |
| In reply to | #1594036 |
On Tue, Mar 07, 2017 at 09:44:55AM +0100, Enric Balletbo i Serra wrote: > Hi Jarkko, > > On 06/03/17 21:59, Jarkko Sakkinen wrote: > > On Fri, Mar 03, 2017 at 05:09:59PM +0100, Enric Balletbo i Serra wrote: > >> From: Sonny Rao <sonnyrao@chromium.org> > >> > >> The suspend/resume behavior of the TPM can be controlled by setting > >> "powered-while-suspended" in the DTS. This is useful for the cases > >> when hardware does not power-off the TPM. > >> > >> Signed-off-by: Sonny Rao <sonnyrao@chromium.org> > >> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> > >> --- > >> Changes since v2: > >> Jarkko Sakkinen > >> - Add a new TPM_CHIP_FLAG_ALWAYS_POWERED flag instead of using a boolean variable. > >> - Remove a trailing newline. > >> Changes since v1: > >> Jason Gunthorpe : > >> - Move the code to handle suspend/resume in the common chip code. > >> > >> Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt | 6 ++++++ > >> drivers/char/tpm/tpm-interface.c | 3 +++ > >> drivers/char/tpm/tpm.h | 1 + > >> drivers/char/tpm/tpm_of.c | 3 +++ > >> 4 files changed, 13 insertions(+) > >> > >> diff --git a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt > >> index 8cb638b..85c8216 100644 > >> --- a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt > >> +++ b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt > >> @@ -8,6 +8,12 @@ Required properties: > >> the firmware event log > >> - linux,sml-size : size of the memory allocated for the firmware event log > >> > >> +Optional properties: > >> + > >> +- powered-while-suspended: present when the TPM is left powered on between > >> + suspend and resume (makes the suspend/resume > >> + callbacks do nothing). > >> + > >> Example (for OpenPower Systems with Nuvoton TPM 2.0 on I2C) > >> ---------------------------------------------------------- > > > > Hey, just noticed something. Shouldn't this be a separate commit? > > During my life submitting patches I saw the both options, sometimes > the maintainer asked me to join the DT patch and the driver and > sometimes he asked me to do in different patches, so I think this is > more a maintainer option. Maybe Rob Herring or Mark Rutland can share > their preferences? > > I'll do what you want I do, TBH I don't have a strong opinion about this. I'll add this to my tree and put it to my next branch so that it will flow to linux-next since it only touch TPM specific file in bindings. I do not have perfect answer for this so I'll use common sense (or try to). Rob, is this OK? /Jarkko
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| From | Rob Herring <robh@kernel.org> |
|---|---|
| Date | 2017-03-12 15:30 +0100 |
| Message-ID | <tkcFs-2Iv-15@gated-at.bofh.it> |
| In reply to | #1594036 |
On Tue, Mar 07, 2017 at 09:44:55AM +0100, Enric Balletbo i Serra wrote: > Hi Jarkko, > > On 06/03/17 21:59, Jarkko Sakkinen wrote: > > On Fri, Mar 03, 2017 at 05:09:59PM +0100, Enric Balletbo i Serra wrote: > >> From: Sonny Rao <sonnyrao@chromium.org> > >> > >> The suspend/resume behavior of the TPM can be controlled by setting > >> "powered-while-suspended" in the DTS. This is useful for the cases > >> when hardware does not power-off the TPM. > >> > >> Signed-off-by: Sonny Rao <sonnyrao@chromium.org> > >> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> > >> --- > >> Changes since v2: > >> Jarkko Sakkinen > >> - Add a new TPM_CHIP_FLAG_ALWAYS_POWERED flag instead of using a boolean variable. > >> - Remove a trailing newline. > >> Changes since v1: > >> Jason Gunthorpe : > >> - Move the code to handle suspend/resume in the common chip code. > >> > >> Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt | 6 ++++++ > >> drivers/char/tpm/tpm-interface.c | 3 +++ > >> drivers/char/tpm/tpm.h | 1 + > >> drivers/char/tpm/tpm_of.c | 3 +++ > >> 4 files changed, 13 insertions(+) > >> > >> diff --git a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt > >> index 8cb638b..85c8216 100644 > >> --- a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt > >> +++ b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt > >> @@ -8,6 +8,12 @@ Required properties: > >> the firmware event log > >> - linux,sml-size : size of the memory allocated for the firmware event log > >> > >> +Optional properties: > >> + > >> +- powered-while-suspended: present when the TPM is left powered on between > >> + suspend and resume (makes the suspend/resume > >> + callbacks do nothing). > >> + > >> Example (for OpenPower Systems with Nuvoton TPM 2.0 on I2C) > >> ---------------------------------------------------------- > > > > Hey, just noticed something. Shouldn't this be a separate commit? > > During my life submitting patches I saw the both options, sometimes the maintainer asked me to join the DT patch and the driver and sometimes he asked me to do in different patches, so I think this is more a maintainer option. Maybe Rob Herring or Mark Rutland can share their preferences? > Need to fix your mailer to wrap lines... We prefer DT bindings to be separate commits, but don't enforce it. I don't ask for on small changes or if there's no other reason to respin the patch. It makes the history for the DT only tree generated from git filter-branch cleaner. Any other maintainers tell you to combine them, they need to talk to me. Rob
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| From | Rob Herring <robh@kernel.org> |
|---|---|
| Date | 2017-03-12 15:40 +0100 |
| Message-ID | <tkcP8-2LP-11@gated-at.bofh.it> |
| In reply to | #1592100 |
On Fri, Mar 03, 2017 at 05:09:59PM +0100, Enric Balletbo i Serra wrote: > From: Sonny Rao <sonnyrao@chromium.org> > > The suspend/resume behavior of the TPM can be controlled by setting > "powered-while-suspended" in the DTS. This is useful for the cases > when hardware does not power-off the TPM. > > Signed-off-by: Sonny Rao <sonnyrao@chromium.org> > Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> > --- > Changes since v2: > Jarkko Sakkinen > - Add a new TPM_CHIP_FLAG_ALWAYS_POWERED flag instead of using a boolean variable. > - Remove a trailing newline. > Changes since v1: > Jason Gunthorpe : > - Move the code to handle suspend/resume in the common chip code. > > Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt | 6 ++++++ I would say this shouldn't be TPM specific, but looks like we already have a dts with this, so: Acked-by: Rob Herring <robh@kernel.org> > drivers/char/tpm/tpm-interface.c | 3 +++ > drivers/char/tpm/tpm.h | 1 + > drivers/char/tpm/tpm_of.c | 3 +++ > 4 files changed, 13 insertions(+)
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