* [PATCH v2] tpm: do not suspend/resume if power stays on
@ 2017-03-02 15:42 ` Enric Balletbo i Serra
0 siblings, 0 replies; 6+ messages in thread
From: Enric Balletbo i Serra @ 2017-03-02 15:42 UTC (permalink / raw)
To: Rob Herring, Peter Huewe
Cc: Mark Rutland, Jason Gunthorpe, linux-kernel, tpmdd-devel, Sonny Rao
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 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 | 3 +++
drivers/char/tpm/tpm_of.c | 3 +++
4 files changed, 15 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..7f60780 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->powered_while_suspended)
+ 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..c8f796c 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -183,10 +183,13 @@ struct tpm_chip {
unsigned long duration[3]; /* jiffies */
bool duration_adjusted;
+ bool powered_while_suspended;
+
struct dentry *bios_dir[TPM_NUM_EVENT_LOG_FILES];
const struct attribute_group *groups[3];
unsigned int groups_cnt;
+
#ifdef CONFIG_ACPI
acpi_handle acpi_dev_handle;
char ppi_version[TPM_PPI_VERSION_LEN + 1];
diff --git a/drivers/char/tpm/tpm_of.c b/drivers/char/tpm/tpm_of.c
index 7dee42d7..33eddd4 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;
+ chip->powered_while_suspended = of_property_read_bool(np,
+ "powered-while-suspended");
+
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
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v2] tpm: do not suspend/resume if power stays on
@ 2017-03-02 15:42 ` Enric Balletbo i Serra
0 siblings, 0 replies; 6+ messages in thread
From: Enric Balletbo i Serra @ 2017-03-02 15:42 UTC (permalink / raw)
To: Rob Herring, Peter Huewe
Cc: Mark Rutland, tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f,
Sonny Rao, linux-kernel-u79uwXL29TY76Z2rM5mHXA
From: Sonny Rao <sonnyrao-F7+t8E8rja9g9hUCZPvPmw@public.gmane.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-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>
---
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 | 3 +++
drivers/char/tpm/tpm_of.c | 3 +++
4 files changed, 15 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..7f60780 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->powered_while_suspended)
+ 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..c8f796c 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -183,10 +183,13 @@ struct tpm_chip {
unsigned long duration[3]; /* jiffies */
bool duration_adjusted;
+ bool powered_while_suspended;
+
struct dentry *bios_dir[TPM_NUM_EVENT_LOG_FILES];
const struct attribute_group *groups[3];
unsigned int groups_cnt;
+
#ifdef CONFIG_ACPI
acpi_handle acpi_dev_handle;
char ppi_version[TPM_PPI_VERSION_LEN + 1];
diff --git a/drivers/char/tpm/tpm_of.c b/drivers/char/tpm/tpm_of.c
index 7dee42d7..33eddd4 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;
+ chip->powered_while_suspended = of_property_read_bool(np,
+ "powered-while-suspended");
+
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
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, SlashDot.org! http://sdm.link/slashdot
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [tpmdd-devel] [PATCH v2] tpm: do not suspend/resume if power stays on
@ 2017-03-03 15:12 ` Jarkko Sakkinen
0 siblings, 0 replies; 6+ messages in thread
From: Jarkko Sakkinen @ 2017-03-03 15:12 UTC (permalink / raw)
To: Enric Balletbo i Serra
Cc: Rob Herring, Peter Huewe, Mark Rutland, tpmdd-devel, Sonny Rao,
linux-kernel
On Thu, Mar 02, 2017 at 04:42:57PM +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 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 | 3 +++
> drivers/char/tpm/tpm_of.c | 3 +++
> 4 files changed, 15 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..7f60780 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->powered_while_suspended)
> + return 0;
Why there can't just be TPM_CHIP_FLAG_ALWAYS_POWERED or something similar?
> +
> 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..c8f796c 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -183,10 +183,13 @@ struct tpm_chip {
> unsigned long duration[3]; /* jiffies */
> bool duration_adjusted;
>
> + bool powered_while_suspended;
> +
> struct dentry *bios_dir[TPM_NUM_EVENT_LOG_FILES];
>
> const struct attribute_group *groups[3];
> unsigned int groups_cnt;
> +
trailing newline
> #ifdef CONFIG_ACPI
> acpi_handle acpi_dev_handle;
> char ppi_version[TPM_PPI_VERSION_LEN + 1];
> diff --git a/drivers/char/tpm/tpm_of.c b/drivers/char/tpm/tpm_of.c
> index 7dee42d7..33eddd4 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;
>
> + chip->powered_while_suspended = of_property_read_bool(np,
> + "powered-while-suspended");
> +
> 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
>
>
> ------------------------------------------------------------------------------
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, SlashDot.org! http://sdm.link/slashdot
> _______________________________________________
> tpmdd-devel mailing list
> tpmdd-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/tpmdd-devel
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2] tpm: do not suspend/resume if power stays on
@ 2017-03-03 15:12 ` Jarkko Sakkinen
0 siblings, 0 replies; 6+ messages in thread
From: Jarkko Sakkinen @ 2017-03-03 15:12 UTC (permalink / raw)
To: Enric Balletbo i Serra
Cc: Mark Rutland, linux-kernel-u79uwXL29TY76Z2rM5mHXA, Rob Herring,
tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f, Sonny Rao
On Thu, Mar 02, 2017 at 04:42:57PM +0100, Enric Balletbo i Serra wrote:
> From: Sonny Rao <sonnyrao-F7+t8E8rja9g9hUCZPvPmw@public.gmane.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-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>
> ---
>
> 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 | 3 +++
> drivers/char/tpm/tpm_of.c | 3 +++
> 4 files changed, 15 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..7f60780 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->powered_while_suspended)
> + return 0;
Why there can't just be TPM_CHIP_FLAG_ALWAYS_POWERED or something similar?
> +
> 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..c8f796c 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -183,10 +183,13 @@ struct tpm_chip {
> unsigned long duration[3]; /* jiffies */
> bool duration_adjusted;
>
> + bool powered_while_suspended;
> +
> struct dentry *bios_dir[TPM_NUM_EVENT_LOG_FILES];
>
> const struct attribute_group *groups[3];
> unsigned int groups_cnt;
> +
trailing newline
> #ifdef CONFIG_ACPI
> acpi_handle acpi_dev_handle;
> char ppi_version[TPM_PPI_VERSION_LEN + 1];
> diff --git a/drivers/char/tpm/tpm_of.c b/drivers/char/tpm/tpm_of.c
> index 7dee42d7..33eddd4 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;
>
> + chip->powered_while_suspended = of_property_read_bool(np,
> + "powered-while-suspended");
> +
> 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
>
>
> ------------------------------------------------------------------------------
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, SlashDot.org! http://sdm.link/slashdot
> _______________________________________________
> tpmdd-devel mailing list
> tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> https://lists.sourceforge.net/lists/listinfo/tpmdd-devel
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, SlashDot.org! http://sdm.link/slashdot
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [tpmdd-devel] [PATCH v2] tpm: do not suspend/resume if power stays on
@ 2017-03-03 15:46 ` Enric Balletbo i Serra
0 siblings, 0 replies; 6+ messages in thread
From: Enric Balletbo i Serra @ 2017-03-03 15:46 UTC (permalink / raw)
To: Jarkko Sakkinen
Cc: Rob Herring, Peter Huewe, Mark Rutland, tpmdd-devel, Sonny Rao,
linux-kernel
Hi Jarkko,
Thanks for the review
On 03/03/17 16:12, Jarkko Sakkinen wrote:
> On Thu, Mar 02, 2017 at 04:42:57PM +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 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 | 3 +++
>> drivers/char/tpm/tpm_of.c | 3 +++
>> 4 files changed, 15 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..7f60780 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->powered_while_suspended)
>> + return 0;
>
> Why there can't just be TPM_CHIP_FLAG_ALWAYS_POWERED or something similar?
>
Right this seems a better way for tpm subsystem. I'll send a v3 today.
>> +
>> 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..c8f796c 100644
>> --- a/drivers/char/tpm/tpm.h
>> +++ b/drivers/char/tpm/tpm.h
>> @@ -183,10 +183,13 @@ struct tpm_chip {
>> unsigned long duration[3]; /* jiffies */
>> bool duration_adjusted;
>>
>> + bool powered_while_suspended;
>> +
>> struct dentry *bios_dir[TPM_NUM_EVENT_LOG_FILES];
>>
>> const struct attribute_group *groups[3];
>> unsigned int groups_cnt;
>> +
>
> trailing newline
>
>> #ifdef CONFIG_ACPI
>> acpi_handle acpi_dev_handle;
>> char ppi_version[TPM_PPI_VERSION_LEN + 1];
>> diff --git a/drivers/char/tpm/tpm_of.c b/drivers/char/tpm/tpm_of.c
>> index 7dee42d7..33eddd4 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;
>>
>> + chip->powered_while_suspended = of_property_read_bool(np,
>> + "powered-while-suspended");
>> +
>> 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
>>
>>
>> ------------------------------------------------------------------------------
>> Check out the vibrant tech community on one of the world's most
>> engaging tech sites, SlashDot.org! http://sdm.link/slashdot
>> _______________________________________________
>> tpmdd-devel mailing list
>> tpmdd-devel@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/tpmdd-devel
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2] tpm: do not suspend/resume if power stays on
@ 2017-03-03 15:46 ` Enric Balletbo i Serra
0 siblings, 0 replies; 6+ messages in thread
From: Enric Balletbo i Serra @ 2017-03-03 15:46 UTC (permalink / raw)
To: Jarkko Sakkinen
Cc: Mark Rutland, linux-kernel-u79uwXL29TY76Z2rM5mHXA, Rob Herring,
tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f, Sonny Rao
Hi Jarkko,
Thanks for the review
On 03/03/17 16:12, Jarkko Sakkinen wrote:
> On Thu, Mar 02, 2017 at 04:42:57PM +0100, Enric Balletbo i Serra wrote:
>> From: Sonny Rao <sonnyrao-F7+t8E8rja9g9hUCZPvPmw@public.gmane.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-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
>> Signed-off-by: Enric Balletbo i Serra <enric.balletbo-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>
>> ---
>>
>> 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 | 3 +++
>> drivers/char/tpm/tpm_of.c | 3 +++
>> 4 files changed, 15 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..7f60780 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->powered_while_suspended)
>> + return 0;
>
> Why there can't just be TPM_CHIP_FLAG_ALWAYS_POWERED or something similar?
>
Right this seems a better way for tpm subsystem. I'll send a v3 today.
>> +
>> 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..c8f796c 100644
>> --- a/drivers/char/tpm/tpm.h
>> +++ b/drivers/char/tpm/tpm.h
>> @@ -183,10 +183,13 @@ struct tpm_chip {
>> unsigned long duration[3]; /* jiffies */
>> bool duration_adjusted;
>>
>> + bool powered_while_suspended;
>> +
>> struct dentry *bios_dir[TPM_NUM_EVENT_LOG_FILES];
>>
>> const struct attribute_group *groups[3];
>> unsigned int groups_cnt;
>> +
>
> trailing newline
>
>> #ifdef CONFIG_ACPI
>> acpi_handle acpi_dev_handle;
>> char ppi_version[TPM_PPI_VERSION_LEN + 1];
>> diff --git a/drivers/char/tpm/tpm_of.c b/drivers/char/tpm/tpm_of.c
>> index 7dee42d7..33eddd4 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;
>>
>> + chip->powered_while_suspended = of_property_read_bool(np,
>> + "powered-while-suspended");
>> +
>> 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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^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2017-03-03 15:52 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-03-02 15:42 [PATCH v2] tpm: do not suspend/resume if power stays on Enric Balletbo i Serra
2017-03-02 15:42 ` Enric Balletbo i Serra
2017-03-03 15:12 ` [tpmdd-devel] " Jarkko Sakkinen
2017-03-03 15:12 ` Jarkko Sakkinen
2017-03-03 15:46 ` [tpmdd-devel] " Enric Balletbo i Serra
2017-03-03 15:46 ` Enric Balletbo i Serra
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