Re: [PATCH 1/1] powerpc/pseries: Interface to represent PAPR firmware attributes
Hello Fabiano, Thank you for your review. On 19/06/21 2:28 am, Fabiano Rosas wrote: "Pratik R. Sampat" writes: 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 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 --- .../sysfs-firmware-papr-energy-scale-info | 26 ++ arch/powerpc/include/asm/hvcall.h | 21 +- arch/powerpc/kvm/trace_hv.h | 1 + arch/powerpc/platforms/pseries/Makefile | 3 +- .../pseries/papr_platform_attributes.c| 292 ++ 5 files changed, 341 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 ..499bc1ae173a --- /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: Director hosting a set of platform attributes on Linux + running as a PAPR guest. This still refers to papr attributes. We want energy/frequency, etc. instead. Sure, I can mention about energy, frequency info attributes here. + + 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: PAPR attributes directory for POWERVM servers Same here. ack. + + This directory provides PAPR information. It And here. ack. + contains below sysfs attributes: + + - desc: File contains the name of attribute desc: String description of the attribute Sure, this description is more complete + + - 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..19a2a8c77a49 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_
Re: [PATCH 1/1] powerpc/pseries: Interface to represent PAPR firmware attributes
"Pratik R. Sampat" writes: > 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 > > 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 > --- > .../sysfs-firmware-papr-energy-scale-info | 26 ++ > arch/powerpc/include/asm/hvcall.h | 21 +- > arch/powerpc/kvm/trace_hv.h | 1 + > arch/powerpc/platforms/pseries/Makefile | 3 +- > .../pseries/papr_platform_attributes.c| 292 ++ > 5 files changed, 341 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 ..499bc1ae173a > --- /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: Director hosting a set of platform attributes on Linux > + running as a PAPR guest. This still refers to papr attributes. We want energy/frequency, etc. instead. > + > + 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: PAPR attributes directory for POWERVM servers Same here. > + > + This directory provides PAPR information. It And here. > + contains below sysfs attributes: > + > + - desc: File contains the name of attribute 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..19a2a8c77a49 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
Re: [PATCH 1/1] powerpc/pseries: Interface to represent PAPR firmware attributes
On Wed, Jun 16, 2021 at 07:12:40PM +0530, 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 For a single attribute, the “firstAttributeId” must be set by the caller to the attribute id to retrieve and the “singleAttribute” field in “flags” must also be set to a 1. If we don't set the "flags" to 1, while specifying a firstAttributeId, the hypervisor will populate the buffer with the details pertaining to all the attributes beginning with firstAttributeId. > > 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 > [..snip..] > + > +static ssize_t papr_show_value(struct kobject *kobj, > + struct kobj_attribute *attr, > + char *buf) > +{ > + struct papr_attr *pattr = container_of(attr, struct papr_attr, attr); > + struct hv_energy_scale_buffer *t_buf; > + struct energy_scale_attributes *t_ea; > + int data_offset, ret = 0; > + > + t_buf = kmalloc(sizeof(*t_buf), GFP_KERNEL); > + if (t_buf == NULL) > + return -ENOMEM; > + > + ret = plpar_hcall_norets(H_GET_ENERGY_SCALE_INFO, 0, > + pattr->id, virt_to_phys(t_buf), > + sizeof(*t_buf)); > + In this case, since we are interested in only one attribute, we can make the call ret = plpar_hcall_norets(H_GET_ENERGY_SCALE_INFO, 1, pattr->id, virt_to_phys(t_buf), sizeof(*t_buf)); setting flags=1. Same in the function papr_show_value_desc() below -- Thanks and Regards gautham. > + if (ret != H_SUCCESS) { > + pr_warn("hcall failed: H_GET_ENERGY_SCALE_INFO"); > + goto out; > + } > + > + data_offset = be64_to_cpu(t_buf->array_offset) - > + (sizeof(t_buf->num_attr) + > + sizeof(t_buf->array_offset) + > + sizeof(t_buf->data_header_version)); > + > + t_ea = (struct energy_scale_attributes *) &t_buf->data[data_offset]; > + > + ret = sprintf(buf, "%llu\n", be64_to_cpu(t_ea->attr_value)); > + if (ret < 0) > + ret = -EIO; > +out: > + kfree(t_buf); > + > + return ret; > +} > + > +static ssize_t papr_show_value_desc(struct kobject *kobj, > + struct kobj_attribute *attr, > + char *buf) > +{ > + struct papr_attr *pattr = container_of(attr, struct papr_attr, attr); > + struct hv_energy_scale_buffer *t_buf; > + struct energy_scale_attributes *t_ea; > + int data_offset, ret = 0; > + > + t_buf = kmalloc(sizeof(*t_buf), GFP_KERNEL); > + if (t_buf == NULL) > + return -ENOMEM; > + > + ret = plpar_hcall_norets(H_GET_ENERGY_SCALE_INFO, 0, > + pattr->id, virt_to_phys(t_buf), > + sizeof(*t_buf)); > + > + if (ret != H_SUCCESS) { > + pr_warn("hcall failed: H_GET_ENERGY_SCALE_INFO"); > + goto out; > + } > + > + data_offset = be64_to_cpu(t_buf->array_offset) - > + (sizeof(t_buf->num_attr) + > + sizeof(t_buf->array_offset) + > + sizeof(t_buf->data_header_version)); > + > + t_ea = (struct energy_scale_attributes *) &t_buf->data[data_offset]; > + > + ret = sprintf(buf, "%s\n", t_ea->attr_value_desc); > + if (ret < 0) > + ret = -EIO; > +out: > + kfree(t_buf); > + > + return ret; > +} > + > +static struct papr_ops_info { > + const char *attr_name; > + ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr, > + char *buf); > +} ops_info[] = { > + { "desc", papr_show_desc }, > + { "va
[PATCH 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 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 --- .../sysfs-firmware-papr-energy-scale-info | 26 ++ arch/powerpc/include/asm/hvcall.h | 21 +- arch/powerpc/kvm/trace_hv.h | 1 + arch/powerpc/platforms/pseries/Makefile | 3 +- .../pseries/papr_platform_attributes.c| 292 ++ 5 files changed, 341 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 ..499bc1ae173a --- /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: Director hosting a set of platform attributes 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: PAPR attributes directory for POWERVM servers + + This directory provides PAPR information. It + contains below sysfs attributes: + + - desc: File contains the name of 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..19a2a8c77a49 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 +632,24 @@ struct hv_gpci_request_buffer { uint8_t bytes[HGPCI_MAX_DATA_BYTES]; } __packed; +#define MAX_EM_ATTRS 10 +#define MAX_EM_DATA_BYTES \ + (sizeof(struct energy_scale_attributes) *