Re: [PATCH v6 1/1] powerpc/pseries: Interface to represent PAPR firmware attributes
On 20/07/21 7:02 pm, kajoljain wrote: On 7/20/21 11:04 AM, Pratik R. Sampat wrote: Adds a generic interface to represent the energy and frequency related PAPR attributes on the system using the new H_CALL "H_GET_ENERGY_SCALE_INFO". H_GET_EM_PARMS H_CALL was previously responsible for exporting this information in the lparcfg, however the H_GET_EM_PARMS H_CALL will be deprecated P10 onwards. The H_GET_ENERGY_SCALE_INFO H_CALL is of the following call format: hcall( uint64 H_GET_ENERGY_SCALE_INFO, // Get energy scale info uint64 flags, // Per the flag request uint64 firstAttributeId,// The attribute id uint64 bufferAddress, // Guest physical address of the output buffer uint64 bufferSize // The size in bytes of the output buffer ); This H_CALL can query either all the attributes at once with firstAttributeId = 0, flags = 0 as well as query only one attribute at a time with firstAttributeId = id, flags = 1. The output buffer consists of the following 1. number of attributes - 8 bytes 2. array offset to the data location - 8 bytes 3. version info - 1 byte 4. A data array of size num attributes, which contains the following: a. attribute ID - 8 bytes b. attribute value in number - 8 bytes c. attribute name in string - 64 bytes d. attribute value in string - 64 bytes The new H_CALL exports information in direct string value format, hence a new interface has been introduced in /sys/firmware/papr/energy_scale_info to export this information to userspace in an extensible pass-through format. The H_CALL returns the name, numeric value and string value (if exists) The format of exposing the sysfs information is as follows: /sys/firmware/papr/energy_scale_info/ |-- / |-- desc |-- value |-- value_desc (if exists) |-- / |-- desc |-- value |-- value_desc (if exists) ... The energy information that is exported is useful for userspace tools such as powerpc-utils. Currently these tools infer the "power_mode_data" value in the lparcfg, which in turn is obtained from the to be deprecated H_GET_EM_PARMS H_CALL. On future platforms, such userspace utilities will have to look at the data returned from the new H_CALL being populated in this new sysfs interface and report this information directly without the need of interpretation. Signed-off-by: Pratik R. Sampat Reviewed-by: Gautham R. Shenoy --- .../sysfs-firmware-papr-energy-scale-info | 26 ++ arch/powerpc/include/asm/hvcall.h | 24 +- arch/powerpc/kvm/trace_hv.h | 1 + arch/powerpc/platforms/pseries/Makefile | 3 +- .../pseries/papr_platform_attributes.c| 312 ++ 5 files changed, 364 insertions(+), 2 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-firmware-papr-energy-scale-info create mode 100644 arch/powerpc/platforms/pseries/papr_platform_attributes.c diff --git a/Documentation/ABI/testing/sysfs-firmware-papr-energy-scale-info b/Documentation/ABI/testing/sysfs-firmware-papr-energy-scale-info new file mode 100644 index ..139a576c7c9d --- /dev/null +++ b/Documentation/ABI/testing/sysfs-firmware-papr-energy-scale-info @@ -0,0 +1,26 @@ +What: /sys/firmware/papr/energy_scale_info +Date: June 2021 +Contact: Linux for PowerPC mailing list +Description: Directory hosting a set of platform attributes like + energy/frequency on Linux running as a PAPR guest. + + Each file in a directory contains a platform + attribute hierarchy pertaining to performance/ + energy-savings mode and processor frequency. + +What: /sys/firmware/papr/energy_scale_info/ + /sys/firmware/papr/energy_scale_info//desc + /sys/firmware/papr/energy_scale_info//value + /sys/firmware/papr/energy_scale_info//value_desc +Date: June 2021 +Contact: Linux for PowerPC mailing list +Description: Energy, frequency attributes directory for POWERVM servers + + This directory provides energy, frequency, folding information. It + contains below sysfs attributes: + + - desc: String description of the attribute + + - value: Numeric value of attribute + + - value_desc: String value of attribute diff --git a/arch/powerpc/include/asm/hvcall.h b/arch/powerpc/include/asm/hvcall.h index e3b29eda8074..c91714ea6719 100644 --- a/arch/powerpc/include/asm/hvcall.h +++ b/arch/powerpc/include/asm/hvcall.h @@ -316,7 +316,8 @@ #define H_SCM_PERFORMANCE_STATS 0x418 #define H_RPT_INVALIDATE 0x448 #define H_SCM_FLUSH 0x44C -#define MAX_HCALL_OPCODE H_SCM_FLUSH +#define H_GET_ENERGY_SCALE_INFO0x450 +#define MAX_HCALL_OPCODE H_GET_ENERGY_SCALE_INFO /* Scope args for H_SCM_UNBIND_ALL */ #define H_UNBIND_SCOPE_ALL
Re: [PATCH v6 1/1] powerpc/pseries: Interface to represent PAPR firmware attributes
On 7/20/21 11:04 AM, Pratik R. Sampat wrote: > Adds a generic interface to represent the energy and frequency related > PAPR attributes on the system using the new H_CALL > "H_GET_ENERGY_SCALE_INFO". > > H_GET_EM_PARMS H_CALL was previously responsible for exporting this > information in the lparcfg, however the H_GET_EM_PARMS H_CALL > will be deprecated P10 onwards. > > The H_GET_ENERGY_SCALE_INFO H_CALL is of the following call format: > hcall( > uint64 H_GET_ENERGY_SCALE_INFO, // Get energy scale info > uint64 flags, // Per the flag request > uint64 firstAttributeId,// The attribute id > uint64 bufferAddress, // Guest physical address of the output buffer > uint64 bufferSize // The size in bytes of the output buffer > ); > > This H_CALL can query either all the attributes at once with > firstAttributeId = 0, flags = 0 as well as query only one attribute > at a time with firstAttributeId = id, flags = 1. > > The output buffer consists of the following > 1. number of attributes - 8 bytes > 2. array offset to the data location - 8 bytes > 3. version info - 1 byte > 4. A data array of size num attributes, which contains the following: > a. attribute ID - 8 bytes > b. attribute value in number - 8 bytes > c. attribute name in string - 64 bytes > d. attribute value in string - 64 bytes > > The new H_CALL exports information in direct string value format, hence > a new interface has been introduced in > /sys/firmware/papr/energy_scale_info to export this information to > userspace in an extensible pass-through format. > > The H_CALL returns the name, numeric value and string value (if exists) > > The format of exposing the sysfs information is as follows: > /sys/firmware/papr/energy_scale_info/ >|-- / > |-- desc > |-- value > |-- value_desc (if exists) >|-- / > |-- desc > |-- value > |-- value_desc (if exists) > ... > > The energy information that is exported is useful for userspace tools > such as powerpc-utils. Currently these tools infer the > "power_mode_data" value in the lparcfg, which in turn is obtained from > the to be deprecated H_GET_EM_PARMS H_CALL. > On future platforms, such userspace utilities will have to look at the > data returned from the new H_CALL being populated in this new sysfs > interface and report this information directly without the need of > interpretation. > > Signed-off-by: Pratik R. Sampat > Reviewed-by: Gautham R. Shenoy > --- > .../sysfs-firmware-papr-energy-scale-info | 26 ++ > arch/powerpc/include/asm/hvcall.h | 24 +- > arch/powerpc/kvm/trace_hv.h | 1 + > arch/powerpc/platforms/pseries/Makefile | 3 +- > .../pseries/papr_platform_attributes.c| 312 ++ > 5 files changed, 364 insertions(+), 2 deletions(-) > create mode 100644 > Documentation/ABI/testing/sysfs-firmware-papr-energy-scale-info > create mode 100644 arch/powerpc/platforms/pseries/papr_platform_attributes.c > > diff --git a/Documentation/ABI/testing/sysfs-firmware-papr-energy-scale-info > b/Documentation/ABI/testing/sysfs-firmware-papr-energy-scale-info > new file mode 100644 > index ..139a576c7c9d > --- /dev/null > +++ b/Documentation/ABI/testing/sysfs-firmware-papr-energy-scale-info > @@ -0,0 +1,26 @@ > +What:/sys/firmware/papr/energy_scale_info > +Date:June 2021 > +Contact: Linux for PowerPC mailing list > +Description: Directory hosting a set of platform attributes like > + energy/frequency on Linux running as a PAPR guest. > + > + Each file in a directory contains a platform > + attribute hierarchy pertaining to performance/ > + energy-savings mode and processor frequency. > + > +What:/sys/firmware/papr/energy_scale_info/ > + /sys/firmware/papr/energy_scale_info//desc > + /sys/firmware/papr/energy_scale_info//value > + /sys/firmware/papr/energy_scale_info//value_desc > +Date:June 2021 > +Contact: Linux for PowerPC mailing list > +Description: Energy, frequency attributes directory for POWERVM servers > + > + This directory provides energy, frequency, folding information. > It > + contains below sysfs attributes: > + > + - desc: String description of the attribute > + > + - value: Numeric value of attribute > + > + - value_desc: String value of attribute > diff --git a/arch/powerpc/include/asm/hvcall.h > b/arch/powerpc/include/asm/hvcall.h > index e3b29eda8074..c91714ea6719 100644 > --- a/arch/powerpc/include/asm/hvcall.h > +++ b/arch/powerpc/include/asm/hvcall.h > @@ -316,7 +316,8 @@ > #define H_SCM_PERFORMANCE_STATS 0x418 > #define H_RPT_INVALIDATE 0x448 > #define H_SCM_FLUSH 0x44C > -#define MAX_HCALL_OPCODE H_SCM_FLUSH > +#define
[PATCH v6 1/1] powerpc/pseries: Interface to represent PAPR firmware attributes
Adds a generic interface to represent the energy and frequency related
PAPR attributes on the system using the new H_CALL
"H_GET_ENERGY_SCALE_INFO".
H_GET_EM_PARMS H_CALL was previously responsible for exporting this
information in the lparcfg, however the H_GET_EM_PARMS H_CALL
will be deprecated P10 onwards.
The H_GET_ENERGY_SCALE_INFO H_CALL is of the following call format:
hcall(
uint64 H_GET_ENERGY_SCALE_INFO, // Get energy scale info
uint64 flags, // Per the flag request
uint64 firstAttributeId,// The attribute id
uint64 bufferAddress, // Guest physical address of the output buffer
uint64 bufferSize // The size in bytes of the output buffer
);
This H_CALL can query either all the attributes at once with
firstAttributeId = 0, flags = 0 as well as query only one attribute
at a time with firstAttributeId = id, flags = 1.
The output buffer consists of the following
1. number of attributes - 8 bytes
2. array offset to the data location - 8 bytes
3. version info - 1 byte
4. A data array of size num attributes, which contains the following:
a. attribute ID - 8 bytes
b. attribute value in number - 8 bytes
c. attribute name in string - 64 bytes
d. attribute value in string - 64 bytes
The new H_CALL exports information in direct string value format, hence
a new interface has been introduced in
/sys/firmware/papr/energy_scale_info to export this information to
userspace in an extensible pass-through format.
The H_CALL returns the name, numeric value and string value (if exists)
The format of exposing the sysfs information is as follows:
/sys/firmware/papr/energy_scale_info/
|-- /
|-- desc
|-- value
|-- value_desc (if exists)
|-- /
|-- desc
|-- value
|-- value_desc (if exists)
...
The energy information that is exported is useful for userspace tools
such as powerpc-utils. Currently these tools infer the
"power_mode_data" value in the lparcfg, which in turn is obtained from
the to be deprecated H_GET_EM_PARMS H_CALL.
On future platforms, such userspace utilities will have to look at the
data returned from the new H_CALL being populated in this new sysfs
interface and report this information directly without the need of
interpretation.
Signed-off-by: Pratik R. Sampat
Reviewed-by: Gautham R. Shenoy
---
.../sysfs-firmware-papr-energy-scale-info | 26 ++
arch/powerpc/include/asm/hvcall.h | 24 +-
arch/powerpc/kvm/trace_hv.h | 1 +
arch/powerpc/platforms/pseries/Makefile | 3 +-
.../pseries/papr_platform_attributes.c| 312 ++
5 files changed, 364 insertions(+), 2 deletions(-)
create mode 100644
Documentation/ABI/testing/sysfs-firmware-papr-energy-scale-info
create mode 100644 arch/powerpc/platforms/pseries/papr_platform_attributes.c
diff --git a/Documentation/ABI/testing/sysfs-firmware-papr-energy-scale-info
b/Documentation/ABI/testing/sysfs-firmware-papr-energy-scale-info
new file mode 100644
index ..139a576c7c9d
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-firmware-papr-energy-scale-info
@@ -0,0 +1,26 @@
+What: /sys/firmware/papr/energy_scale_info
+Date: June 2021
+Contact: Linux for PowerPC mailing list
+Description: Directory hosting a set of platform attributes like
+ energy/frequency on Linux running as a PAPR guest.
+
+ Each file in a directory contains a platform
+ attribute hierarchy pertaining to performance/
+ energy-savings mode and processor frequency.
+
+What: /sys/firmware/papr/energy_scale_info/
+ /sys/firmware/papr/energy_scale_info//desc
+ /sys/firmware/papr/energy_scale_info//value
+ /sys/firmware/papr/energy_scale_info//value_desc
+Date: June 2021
+Contact: Linux for PowerPC mailing list
+Description: Energy, frequency attributes directory for POWERVM servers
+
+ This directory provides energy, frequency, folding information.
It
+ contains below sysfs attributes:
+
+ - desc: String description of the attribute
+
+ - value: Numeric value of attribute
+
+ - value_desc: String value of attribute
diff --git a/arch/powerpc/include/asm/hvcall.h
b/arch/powerpc/include/asm/hvcall.h
index e3b29eda8074..c91714ea6719 100644
--- a/arch/powerpc/include/asm/hvcall.h
+++ b/arch/powerpc/include/asm/hvcall.h
@@ -316,7 +316,8 @@
#define H_SCM_PERFORMANCE_STATS 0x418
#define H_RPT_INVALIDATE 0x448
#define H_SCM_FLUSH0x44C
-#define MAX_HCALL_OPCODE H_SCM_FLUSH
+#define H_GET_ENERGY_SCALE_INFO0x450
+#define MAX_HCALL_OPCODE H_GET_ENERGY_SCALE_INFO
/* Scope args for H_SCM_UNBIND_ALL */
#define H_UNBIND_SCOPE_ALL (0x1)
@@ -631,6 +632,27 @@ struct hv_gpci_request_buffer {
uint8_t bytes[HGPCI_MAX_DATA_BYTES];
} __packed;
