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Sampat" To: mpe@ellerman.id.au, benh@kernel.crashing.org, paulus@samba.org, farosas@linux.ibm.com, kjain@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, kvm-ppc@vger.kernel.org, linux-kernel@vger.kernel.org, psampat@linux.ibm.com, pratik.r.sampat@gmail.com Subject: [PATCH v7 1/1] powerpc/pseries: Interface to represent PAPR firmware attributes Date: Fri, 23 Jul 2021 11:16:09 +0530 Message-Id: <20210723054609.15033-2-psampat@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210723054609.15033-1-psampat@linux.ibm.com> References: <20210723054609.15033-1-psampat@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: uqffbNol2sMsLwIPVcM7V-6bkFGZy602 X-Proofpoint-GUID: ttsEa13GD-TlAyZBr7-HfV7BzADp3e_2 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-07-22_16:2021-07-22,2021-07-22 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 lowpriorityscore=0 phishscore=0 adultscore=0 priorityscore=1501 clxscore=1015 malwarescore=0 spamscore=0 mlxlogscore=999 bulkscore=0 mlxscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2107230031 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 000000000000..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_INFO 0x450 +#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; +#define ESI_VERSION 0x1 +#define MAX_ESI_ATTRS 10 +#define MAX_BUF_SZ (sizeof(struct h_energy_scale_info_hdr) + \ + (sizeof(struct energy_scale_attribute) * MAX_ESI_ATTRS)) + +struct energy_scale_attribute { + __be64 id; + __be64 value; + unsigned char desc[64]; + unsigned char value_desc[64]; +} __packed; + +struct h_energy_scale_info_hdr { + __be64 num_attrs; + __be64 array_offset; + __u8 data_header_version; +} __packed; + +/* /sys/firmware/papr */ +extern struct kobject *papr_kobj; + #endif /* __ASSEMBLY__ */ #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_HVCALL_H */ diff --git a/arch/powerpc/kvm/trace_hv.h b/arch/powerpc/kvm/trace_hv.h index 830a126e095d..38cd0ed0a617 100644 --- a/arch/powerpc/kvm/trace_hv.h +++ b/arch/powerpc/kvm/trace_hv.h @@ -115,6 +115,7 @@ {H_VASI_STATE, "H_VASI_STATE"}, \ {H_ENABLE_CRQ, "H_ENABLE_CRQ"}, \ {H_GET_EM_PARMS, "H_GET_EM_PARMS"}, \ + {H_GET_ENERGY_SCALE_INFO, "H_GET_ENERGY_SCALE_INFO"}, \ {H_SET_MPP, "H_SET_MPP"}, \ {H_GET_MPP, "H_GET_MPP"}, \ {H_HOME_NODE_ASSOCIATIVITY, "H_HOME_NODE_ASSOCIATIVITY"}, \ diff --git a/arch/powerpc/platforms/pseries/Makefile b/arch/powerpc/platforms/pseries/Makefile index c8a2b0b05ac0..d14fca89ac25 100644 --- a/arch/powerpc/platforms/pseries/Makefile +++ b/arch/powerpc/platforms/pseries/Makefile @@ -6,7 +6,8 @@ obj-y := lpar.o hvCall.o nvram.o reconfig.o \ of_helpers.o \ setup.o iommu.o event_sources.o ras.o \ firmware.o power.o dlpar.o mobility.o rng.o \ - pci.o pci_dlpar.o eeh_pseries.o msi.o + pci.o pci_dlpar.o eeh_pseries.o msi.o \ + papr_platform_attributes.o obj-$(CONFIG_SMP) += smp.o obj-$(CONFIG_SCANLOG) += scanlog.o obj-$(CONFIG_KEXEC_CORE) += kexec.o diff --git a/arch/powerpc/platforms/pseries/papr_platform_attributes.c b/arch/powerpc/platforms/pseries/papr_platform_attributes.c new file mode 100644 index 000000000000..84ddce52e519 --- /dev/null +++ b/arch/powerpc/platforms/pseries/papr_platform_attributes.c @@ -0,0 +1,312 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Platform energy and frequency attributes driver + * + * This driver creates a sys file at /sys/firmware/papr/ which encapsulates a + * directory structure containing files in keyword - value pairs that specify + * energy and frequency configuration of the system. + * + * 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) + * + * Copyright 2021 IBM Corp. + */ + +#include +#include + +#include "pseries.h" + +/* + * Flag attributes to fetch either all or one attribute from the HCALL + * flag = BE(0) => fetch all attributes with firstAttributeId = 0 + * flag = BE(1) => fetch a single attribute with firstAttributeId = id + */ +#define ESI_FLAGS_ALL 0 +#define ESI_FLAGS_SINGLE PPC_BIT(0) + +#define MAX_ATTRS 3 + +struct papr_attr { + u64 id; + struct kobj_attribute kobj_attr; +}; +struct papr_group { + struct attribute_group pg; + struct papr_attr pgattrs[MAX_ATTRS]; +} *pgs; + +/* /sys/firmware/papr */ +struct kobject *papr_kobj; +/* /sys/firmware/papr/energy_scale_info */ +struct kobject *esi_kobj; + +/* + * Extract and export the description of the energy scale attributes + */ +static ssize_t papr_show_desc(struct kobject *kobj, + struct kobj_attribute *kobj_attr, + char *buf) +{ + struct papr_attr *pattr = container_of(kobj_attr, struct papr_attr, + kobj_attr); + struct h_energy_scale_info_hdr *t_hdr; + struct energy_scale_attribute *t_esi; + char *t_buf; + int ret = 0; + + t_buf = kmalloc(MAX_BUF_SZ, GFP_KERNEL); + if (t_buf == NULL) + return -ENOMEM; + + ret = plpar_hcall_norets(H_GET_ENERGY_SCALE_INFO, ESI_FLAGS_SINGLE, + pattr->id, virt_to_phys(t_buf), + MAX_BUF_SZ); + + if (ret != H_SUCCESS) { + pr_warn("hcall failed: H_GET_ENERGY_SCALE_INFO"); + goto out; + } + + t_hdr = (struct h_energy_scale_info_hdr *) t_buf; + t_esi = (struct energy_scale_attribute *) + (t_buf + be64_to_cpu(t_hdr->array_offset)); + + ret = snprintf(buf, sizeof(t_esi->desc), "%s\n", t_esi->desc); + if (ret < 0) + ret = -EIO; +out: + kfree(t_buf); + + return ret; +} + +/* + * Extract and export the numeric value of the energy scale attributes + */ +static ssize_t papr_show_value(struct kobject *kobj, + struct kobj_attribute *kobj_attr, + char *buf) +{ + struct papr_attr *pattr = container_of(kobj_attr, struct papr_attr, + kobj_attr); + struct h_energy_scale_info_hdr *t_hdr; + struct energy_scale_attribute *t_esi; + char *t_buf; + int ret = 0; + + t_buf = kmalloc(MAX_BUF_SZ, GFP_KERNEL); + if (t_buf == NULL) + return -ENOMEM; + + ret = plpar_hcall_norets(H_GET_ENERGY_SCALE_INFO, ESI_FLAGS_SINGLE, + pattr->id, virt_to_phys(t_buf), + MAX_BUF_SZ); + + if (ret != H_SUCCESS) { + pr_warn("hcall failed: H_GET_ENERGY_SCALE_INFO"); + goto out; + } + + t_hdr = (struct h_energy_scale_info_hdr *) t_buf; + t_esi = (struct energy_scale_attribute *) + (t_buf + be64_to_cpu(t_hdr->array_offset)); + + ret = snprintf(buf, sizeof(t_esi->value), "%llu\n", + be64_to_cpu(t_esi->value)); + if (ret < 0) + ret = -EIO; +out: + kfree(t_buf); + + return ret; +} + +/* + * Extract and export the value description in string format of the energy + * scale attributes + */ +static ssize_t papr_show_value_desc(struct kobject *kobj, + struct kobj_attribute *kobj_attr, + char *buf) +{ + struct papr_attr *pattr = container_of(kobj_attr, struct papr_attr, + kobj_attr); + struct h_energy_scale_info_hdr *t_hdr; + struct energy_scale_attribute *t_esi; + char *t_buf; + int ret = 0; + + t_buf = kmalloc(MAX_BUF_SZ, GFP_KERNEL); + if (t_buf == NULL) + return -ENOMEM; + + ret = plpar_hcall_norets(H_GET_ENERGY_SCALE_INFO, ESI_FLAGS_SINGLE, + pattr->id, virt_to_phys(t_buf), + MAX_BUF_SZ); + + if (ret != H_SUCCESS) { + pr_warn("hcall failed: H_GET_ENERGY_SCALE_INFO"); + goto out; + } + + t_hdr = (struct h_energy_scale_info_hdr *) t_buf; + t_esi = (struct energy_scale_attribute *) + (t_buf + be64_to_cpu(t_hdr->array_offset)); + + ret = snprintf(buf, sizeof(t_esi->value_desc), "%s\n", + t_esi->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 *kobj_attr, + char *buf); +} ops_info[MAX_ATTRS] = { + { "desc", papr_show_desc }, + { "value", papr_show_value }, + { "value_desc", papr_show_value_desc }, +}; + +static void add_attr(u64 id, int index, struct papr_attr *attr) +{ + attr->id = id; + sysfs_attr_init(&attr->kobj_attr.attr); + attr->kobj_attr.attr.name = ops_info[index].attr_name; + attr->kobj_attr.attr.mode = 0444; + attr->kobj_attr.show = ops_info[index].show; +} + +static int add_attr_group(u64 id, struct papr_group *pg, bool show_val_desc) +{ + int i; + + for (i = 0; i < MAX_ATTRS; i++) { + if (!strcmp(ops_info[i].attr_name, "value_desc") && + !show_val_desc) { + continue; + } + add_attr(id, i, &pg->pgattrs[i]); + pg->pg.attrs[i] = &pg->pgattrs[i].kobj_attr.attr; + } + + return sysfs_create_group(esi_kobj, &pg->pg); +} + +static int __init papr_init(void) +{ + struct h_energy_scale_info_hdr *esi_hdr; + struct energy_scale_attribute *esi_attrs; + uint64_t num_attrs; + int ret, idx, i; + char *esi_buf; + + if (!firmware_has_feature(FW_FEATURE_LPAR)) + return -ENXIO; + + esi_buf = kmalloc(MAX_BUF_SZ, GFP_KERNEL); + if (esi_buf == NULL) + return -ENOMEM; + /* + * 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 + */ + ret = plpar_hcall_norets(H_GET_ENERGY_SCALE_INFO, ESI_FLAGS_ALL, 0, + virt_to_phys(esi_buf), MAX_BUF_SZ); + if (ret != H_SUCCESS) { + pr_warn("hcall failed: H_GET_ENERGY_SCALE_INFO"); + goto out; + } + + esi_hdr = (struct h_energy_scale_info_hdr *) esi_buf; + if (esi_hdr->data_header_version != ESI_VERSION) { + pr_warn("H_GET_ENERGY_SCALE_INFO VER MISMATCH - EXP: 0x%x, REC: 0x%x", + ESI_VERSION, esi_hdr->data_header_version); + } + + num_attrs = be64_to_cpu(esi_hdr->num_attrs); + esi_attrs = (struct energy_scale_attribute *) + (esi_buf + be64_to_cpu(esi_hdr->array_offset)); + + pgs = kcalloc(num_attrs, sizeof(*pgs), GFP_KERNEL); + if (!pgs) + goto out; + + papr_kobj = kobject_create_and_add("papr", firmware_kobj); + if (!papr_kobj) { + pr_warn("kobject_create_and_add papr failed\n"); + goto out_pgs; + } + + esi_kobj = kobject_create_and_add("energy_scale_info", papr_kobj); + if (!esi_kobj) { + pr_warn("kobject_create_and_add energy_scale_info failed\n"); + goto out_kobj; + } + + for (idx = 0; idx < num_attrs; idx++) { + bool show_val_desc = true; + + pgs[idx].pg.attrs = kcalloc(MAX_ATTRS + 1, + sizeof(*pgs[idx].pg.attrs), + GFP_KERNEL); + if (!pgs[idx].pg.attrs) { + goto out_pgattrs; + } + + pgs[idx].pg.name = kasprintf(GFP_KERNEL, "%lld", + be64_to_cpu(esi_attrs[idx].id)); + if (pgs[idx].pg.name == NULL) { + goto out_pgattrs; + } + /* Do not add the value description if it does not exist */ + if (strnlen(esi_attrs[idx].value_desc, + sizeof(esi_attrs[idx].value_desc)) == 0) + show_val_desc = false; + + if (add_attr_group(be64_to_cpu(esi_attrs[idx].id), &pgs[idx], + show_val_desc)) { + pr_warn("Failed to create papr attribute group %s\n", + pgs[idx].pg.name); + goto out_pgattrs; + } + } + + kfree(esi_buf); + return 0; + +out_pgattrs: + for (i = 0; i < idx ; i++) { + kfree(pgs[i].pg.attrs); + kfree(pgs[i].pg.name); + } + kobject_put(esi_kobj); +out_kobj: + kobject_put(papr_kobj); +out_pgs: + kfree(pgs); +out: + kfree(esi_buf); + + return -ENOMEM; +} + +machine_device_initcall(pseries, papr_init); -- 2.31.1