| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Performance event support for s390x |
| * |
| * Copyright IBM Corp. 2012, 2013 |
| * Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com> |
| */ |
| #define KMSG_COMPONENT "perf" |
| #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| |
| #include <linux/kernel.h> |
| #include <linux/perf_event.h> |
| #include <linux/kvm_host.h> |
| #include <linux/percpu.h> |
| #include <linux/export.h> |
| #include <linux/seq_file.h> |
| #include <linux/spinlock.h> |
| #include <linux/sysfs.h> |
| #include <asm/irq.h> |
| #include <asm/cpu_mf.h> |
| #include <asm/lowcore.h> |
| #include <asm/processor.h> |
| #include <asm/sysinfo.h> |
| #include <asm/unwind.h> |
| |
| const char *perf_pmu_name(void) |
| { |
| if (cpum_cf_avail() || cpum_sf_avail()) |
| return "CPU-Measurement Facilities (CPU-MF)"; |
| return "pmu"; |
| } |
| EXPORT_SYMBOL(perf_pmu_name); |
| |
| int perf_num_counters(void) |
| { |
| int num = 0; |
| |
| if (cpum_cf_avail()) |
| num += PERF_CPUM_CF_MAX_CTR; |
| if (cpum_sf_avail()) |
| num += PERF_CPUM_SF_MAX_CTR; |
| |
| return num; |
| } |
| EXPORT_SYMBOL(perf_num_counters); |
| |
| static struct kvm_s390_sie_block *sie_block(struct pt_regs *regs) |
| { |
| struct stack_frame *stack = (struct stack_frame *) regs->gprs[15]; |
| |
| if (!stack) |
| return NULL; |
| |
| return (struct kvm_s390_sie_block *) stack->empty1[0]; |
| } |
| |
| static bool is_in_guest(struct pt_regs *regs) |
| { |
| if (user_mode(regs)) |
| return false; |
| #if IS_ENABLED(CONFIG_KVM) |
| return instruction_pointer(regs) == (unsigned long) &sie_exit; |
| #else |
| return false; |
| #endif |
| } |
| |
| static unsigned long guest_is_user_mode(struct pt_regs *regs) |
| { |
| return sie_block(regs)->gpsw.mask & PSW_MASK_PSTATE; |
| } |
| |
| static unsigned long instruction_pointer_guest(struct pt_regs *regs) |
| { |
| return sie_block(regs)->gpsw.addr; |
| } |
| |
| unsigned long perf_instruction_pointer(struct pt_regs *regs) |
| { |
| return is_in_guest(regs) ? instruction_pointer_guest(regs) |
| : instruction_pointer(regs); |
| } |
| |
| static unsigned long perf_misc_guest_flags(struct pt_regs *regs) |
| { |
| return guest_is_user_mode(regs) ? PERF_RECORD_MISC_GUEST_USER |
| : PERF_RECORD_MISC_GUEST_KERNEL; |
| } |
| |
| static unsigned long perf_misc_flags_sf(struct pt_regs *regs) |
| { |
| struct perf_sf_sde_regs *sde_regs; |
| unsigned long flags; |
| |
| sde_regs = (struct perf_sf_sde_regs *) ®s->int_parm_long; |
| if (sde_regs->in_guest) |
| flags = user_mode(regs) ? PERF_RECORD_MISC_GUEST_USER |
| : PERF_RECORD_MISC_GUEST_KERNEL; |
| else |
| flags = user_mode(regs) ? PERF_RECORD_MISC_USER |
| : PERF_RECORD_MISC_KERNEL; |
| return flags; |
| } |
| |
| unsigned long perf_misc_flags(struct pt_regs *regs) |
| { |
| /* Check if the cpum_sf PMU has created the pt_regs structure. |
| * In this case, perf misc flags can be easily extracted. Otherwise, |
| * do regular checks on the pt_regs content. |
| */ |
| if (regs->int_code == 0x1407 && regs->int_parm == CPU_MF_INT_SF_PRA) |
| if (!regs->gprs[15]) |
| return perf_misc_flags_sf(regs); |
| |
| if (is_in_guest(regs)) |
| return perf_misc_guest_flags(regs); |
| |
| return user_mode(regs) ? PERF_RECORD_MISC_USER |
| : PERF_RECORD_MISC_KERNEL; |
| } |
| |
| static void print_debug_cf(void) |
| { |
| struct cpumf_ctr_info cf_info; |
| int cpu = smp_processor_id(); |
| |
| memset(&cf_info, 0, sizeof(cf_info)); |
| if (!qctri(&cf_info)) |
| pr_info("CPU[%i] CPUM_CF: ver=%u.%u A=%04x E=%04x C=%04x\n", |
| cpu, cf_info.cfvn, cf_info.csvn, |
| cf_info.auth_ctl, cf_info.enable_ctl, cf_info.act_ctl); |
| } |
| |
| static void print_debug_sf(void) |
| { |
| struct hws_qsi_info_block si; |
| int cpu = smp_processor_id(); |
| |
| memset(&si, 0, sizeof(si)); |
| if (qsi(&si)) |
| return; |
| |
| pr_info("CPU[%i] CPUM_SF: basic=%i diag=%i min=%lu max=%lu cpu_speed=%u\n", |
| cpu, si.as, si.ad, si.min_sampl_rate, si.max_sampl_rate, |
| si.cpu_speed); |
| |
| if (si.as) |
| pr_info("CPU[%i] CPUM_SF: Basic-sampling: a=%i e=%i c=%i" |
| " bsdes=%i tear=%016lx dear=%016lx\n", cpu, |
| si.as, si.es, si.cs, si.bsdes, si.tear, si.dear); |
| if (si.ad) |
| pr_info("CPU[%i] CPUM_SF: Diagnostic-sampling: a=%i e=%i c=%i" |
| " dsdes=%i tear=%016lx dear=%016lx\n", cpu, |
| si.ad, si.ed, si.cd, si.dsdes, si.tear, si.dear); |
| } |
| |
| void perf_event_print_debug(void) |
| { |
| unsigned long flags; |
| |
| local_irq_save(flags); |
| if (cpum_cf_avail()) |
| print_debug_cf(); |
| if (cpum_sf_avail()) |
| print_debug_sf(); |
| local_irq_restore(flags); |
| } |
| |
| /* Service level infrastructure */ |
| static void sl_print_counter(struct seq_file *m) |
| { |
| struct cpumf_ctr_info ci; |
| |
| memset(&ci, 0, sizeof(ci)); |
| if (qctri(&ci)) |
| return; |
| |
| seq_printf(m, "CPU-MF: Counter facility: version=%u.%u " |
| "authorization=%04x\n", ci.cfvn, ci.csvn, ci.auth_ctl); |
| } |
| |
| static void sl_print_sampling(struct seq_file *m) |
| { |
| struct hws_qsi_info_block si; |
| |
| memset(&si, 0, sizeof(si)); |
| if (qsi(&si)) |
| return; |
| |
| if (!si.as && !si.ad) |
| return; |
| |
| seq_printf(m, "CPU-MF: Sampling facility: min_rate=%lu max_rate=%lu" |
| " cpu_speed=%u\n", si.min_sampl_rate, si.max_sampl_rate, |
| si.cpu_speed); |
| if (si.as) |
| seq_printf(m, "CPU-MF: Sampling facility: mode=basic" |
| " sample_size=%u\n", si.bsdes); |
| if (si.ad) |
| seq_printf(m, "CPU-MF: Sampling facility: mode=diagnostic" |
| " sample_size=%u\n", si.dsdes); |
| } |
| |
| static void service_level_perf_print(struct seq_file *m, |
| struct service_level *sl) |
| { |
| if (cpum_cf_avail()) |
| sl_print_counter(m); |
| if (cpum_sf_avail()) |
| sl_print_sampling(m); |
| } |
| |
| static struct service_level service_level_perf = { |
| .seq_print = service_level_perf_print, |
| }; |
| |
| static int __init service_level_perf_register(void) |
| { |
| return register_service_level(&service_level_perf); |
| } |
| arch_initcall(service_level_perf_register); |
| |
| void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, |
| struct pt_regs *regs) |
| { |
| struct unwind_state state; |
| |
| unwind_for_each_frame(&state, current, regs, 0) |
| perf_callchain_store(entry, state.ip); |
| } |
| |
| /* Perf definitions for PMU event attributes in sysfs */ |
| ssize_t cpumf_events_sysfs_show(struct device *dev, |
| struct device_attribute *attr, char *page) |
| { |
| struct perf_pmu_events_attr *pmu_attr; |
| |
| pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr); |
| return sprintf(page, "event=0x%04llx\n", pmu_attr->id); |
| } |