| Message ID | 20210716152133.72455-2-psampat@linux.ibm.com |
|---|---|
| State | New |
| Headers | show |
| Series | Interface to represent PAPR firmware attributes | expand |
"Pratik R. Sampat" <psampat@linux.ibm.com> writes: > +#include <linux/module.h> > +#include <linux/types.h> > +#include <linux/errno.h> > +#include <linux/init.h> > +#include <linux/seq_file.h> > +#include <linux/slab.h> > +#include <linux/uaccess.h> > +#include <linux/hugetlb.h> > +#include <asm/lppaca.h> > +#include <asm/hvcall.h> > +#include <asm/firmware.h> > +#include <asm/time.h> > +#include <asm/prom.h> > +#include <asm/vdso_datapage.h> > +#include <asm/vio.h> > +#include <asm/mmu.h> > +#include <asm/machdep.h> > +#include <asm/drmem.h> Do you need all of these headers? Sorry to mention just now, I seem to have dropped this comment from a previous review. > + > +#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 attribute > + * Extra line here. > + */ > +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, int len, struct papr_group *pg, > + bool show_val_desc) > +{ > + int i; > + > + for (i = 0; i < len; i++) { Could use MAX_ATTRS directly. > + 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_ekobj; What about the attrs allocated during the previous iterations? > + > + pgs[idx].pg.name = kasprintf(GFP_KERNEL, "%lld", > + be64_to_cpu(esi_attrs[idx].id)); > + if (pgs[idx].pg.name == NULL) { > + for (i = idx; i >= 0; i--) > + kfree(pgs[i].pg.attrs); > + goto out_ekobj; > + } > + /* Do not add the value description if it does not exist */ > + if (strlen(esi_attrs[idx].value_desc) == 0) strnlen > + show_val_desc = false; > + > + if (add_attr_group(be64_to_cpu(esi_attrs[idx].id), > + MAX_ATTRS, &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 < MAX_ATTRS ; i++) { pgs is num_attrs long > + kfree(pgs[i].pg.attrs); > + kfree(pgs[i].pg.name); > + } > +out_ekobj: > + 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);
On 17/07/21 12:35 am, Fabiano Rosas wrote: > "Pratik R. Sampat" <psampat@linux.ibm.com> writes: > >> +#include <linux/module.h> >> +#include <linux/types.h> >> +#include <linux/errno.h> >> +#include <linux/init.h> >> +#include <linux/seq_file.h> >> +#include <linux/slab.h> >> +#include <linux/uaccess.h> >> +#include <linux/hugetlb.h> >> +#include <asm/lppaca.h> >> +#include <asm/hvcall.h> >> +#include <asm/firmware.h> >> +#include <asm/time.h> >> +#include <asm/prom.h> >> +#include <asm/vdso_datapage.h> >> +#include <asm/vio.h> >> +#include <asm/mmu.h> >> +#include <asm/machdep.h> >> +#include <asm/drmem.h> > Do you need all of these headers? Sorry to mention just now, I seem to have > dropped this comment from a previous review. Ah yes, that was a TODO on my part I had missed as cleanups. I'll verify if I do need all of them and get back to you. >> + >> +#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 attribute >> + * > Extra line here. ack. >> + */ >> +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, int len, struct papr_group *pg, >> + bool show_val_desc) >> +{ >> + int i; >> + >> + for (i = 0; i < len; i++) { > Could use MAX_ATTRS directly. Sure, while writing this initially I wasn't sure how many attrs we'd have so it passed as param, now I see that's not needed so I can remove that and use MAX_ATTRS itself >> + 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_ekobj; > What about the attrs allocated during the previous iterations? Yes, you're right that needs cleanups. I could write the following to clean up old entries like I did when space for name couldn't be allocated: for (i = idx - 1; i >= 0; i++) kfree(pgs[i].pg.attrs); Thanks for pointing that out. >> + >> + pgs[idx].pg.name = kasprintf(GFP_KERNEL, "%lld", >> + be64_to_cpu(esi_attrs[idx].id)); >> + if (pgs[idx].pg.name == NULL) { >> + for (i = idx; i >= 0; i--) >> + kfree(pgs[i].pg.attrs); >> + goto out_ekobj; >> + } >> + /* Do not add the value description if it does not exist */ >> + if (strlen(esi_attrs[idx].value_desc) == 0) > strnlen ack > >> + show_val_desc = false; >> + >> + if (add_attr_group(be64_to_cpu(esi_attrs[idx].id), >> + MAX_ATTRS, &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 < MAX_ATTRS ; i++) { > pgs is num_attrs long Ah yes, you're right. It should loop over num_attrs > >> + kfree(pgs[i].pg.attrs); >> + kfree(pgs[i].pg.name); >> + } >> +out_ekobj: >> + 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);
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 <linuxppc-dev@ozlabs.org> +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/<id> + /sys/firmware/papr/energy_scale_info/<id>/desc + /sys/firmware/papr/energy_scale_info/<id>/value + /sys/firmware/papr/energy_scale_info/<id>/value_desc +Date: June 2021 +Contact: Linux for PowerPC mailing list <linuxppc-dev@ozlabs.org> +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 <id> + + - value: Numeric value of attribute <id> + + - value_desc: String value of attribute <id> 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..32262038dbf4 --- /dev/null +++ b/arch/powerpc/platforms/pseries/papr_platform_attributes.c @@ -0,0 +1,331 @@ +// 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/ + * |-- <id>/ + * |-- desc + * |-- value + * |-- value_desc (if exists) + * |-- <id>/ + * |-- desc + * |-- value + * |-- value_desc (if exists) + * + * Copyright 2021 IBM Corp. + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/seq_file.h> +#include <linux/slab.h> +#include <linux/uaccess.h> +#include <linux/hugetlb.h> +#include <asm/lppaca.h> +#include <asm/hvcall.h> +#include <asm/firmware.h> +#include <asm/time.h> +#include <asm/prom.h> +#include <asm/vdso_datapage.h> +#include <asm/vio.h> +#include <asm/mmu.h> +#include <asm/machdep.h> +#include <asm/drmem.h> + +#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 attribute + * + */ +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, int len, struct papr_group *pg, + bool show_val_desc) +{ + int i; + + for (i = 0; i < len; 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_ekobj; + + pgs[idx].pg.name = kasprintf(GFP_KERNEL, "%lld", + be64_to_cpu(esi_attrs[idx].id)); + if (pgs[idx].pg.name == NULL) { + for (i = idx; i >= 0; i--) + kfree(pgs[i].pg.attrs); + goto out_ekobj; + } + /* Do not add the value description if it does not exist */ + if (strlen(esi_attrs[idx].value_desc) == 0) + show_val_desc = false; + + if (add_attr_group(be64_to_cpu(esi_attrs[idx].id), + MAX_ATTRS, &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 < MAX_ATTRS ; i++) { + kfree(pgs[i].pg.attrs); + kfree(pgs[i].pg.name); + } +out_ekobj: + 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);
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/ |-- <id>/ |-- desc |-- value |-- value_desc (if exists) |-- <id>/ |-- 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 <psampat@linux.ibm.com> Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> --- .../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 | 331 ++++++++++++++++++ 5 files changed, 383 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