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8#define KMSG_COMPONENT "perf"
9#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
10
11#include <linux/kernel.h>
12#include <linux/perf_event.h>
13#include <linux/kvm_host.h>
14#include <linux/percpu.h>
15#include <linux/export.h>
16#include <linux/seq_file.h>
17#include <linux/spinlock.h>
18#include <linux/sysfs.h>
19#include <asm/irq.h>
20#include <asm/cpu_mf.h>
21#include <asm/lowcore.h>
22#include <asm/processor.h>
23#include <asm/sysinfo.h>
24#include <asm/unwind.h>
25
26const char *perf_pmu_name(void)
27{
28 if (cpum_cf_avail() || cpum_sf_avail())
29 return "CPU-Measurement Facilities (CPU-MF)";
30 return "pmu";
31}
32EXPORT_SYMBOL(perf_pmu_name);
33
34int perf_num_counters(void)
35{
36 int num = 0;
37
38 if (cpum_cf_avail())
39 num += PERF_CPUM_CF_MAX_CTR;
40 if (cpum_sf_avail())
41 num += PERF_CPUM_SF_MAX_CTR;
42
43 return num;
44}
45EXPORT_SYMBOL(perf_num_counters);
46
47static struct kvm_s390_sie_block *sie_block(struct pt_regs *regs)
48{
49 struct stack_frame *stack = (struct stack_frame *) regs->gprs[15];
50
51 if (!stack)
52 return NULL;
53
54 return (struct kvm_s390_sie_block *) stack->empty1[0];
55}
56
57static bool is_in_guest(struct pt_regs *regs)
58{
59 if (user_mode(regs))
60 return false;
61#if IS_ENABLED(CONFIG_KVM)
62 return instruction_pointer(regs) == (unsigned long) &sie_exit;
63#else
64 return false;
65#endif
66}
67
68static unsigned long guest_is_user_mode(struct pt_regs *regs)
69{
70 return sie_block(regs)->gpsw.mask & PSW_MASK_PSTATE;
71}
72
73static unsigned long instruction_pointer_guest(struct pt_regs *regs)
74{
75 return sie_block(regs)->gpsw.addr;
76}
77
78unsigned long perf_instruction_pointer(struct pt_regs *regs)
79{
80 return is_in_guest(regs) ? instruction_pointer_guest(regs)
81 : instruction_pointer(regs);
82}
83
84static unsigned long perf_misc_guest_flags(struct pt_regs *regs)
85{
86 return guest_is_user_mode(regs) ? PERF_RECORD_MISC_GUEST_USER
87 : PERF_RECORD_MISC_GUEST_KERNEL;
88}
89
90static unsigned long perf_misc_flags_sf(struct pt_regs *regs)
91{
92 struct perf_sf_sde_regs *sde_regs;
93 unsigned long flags;
94
95 sde_regs = (struct perf_sf_sde_regs *) ®s->int_parm_long;
96 if (sde_regs->in_guest)
97 flags = user_mode(regs) ? PERF_RECORD_MISC_GUEST_USER
98 : PERF_RECORD_MISC_GUEST_KERNEL;
99 else
100 flags = user_mode(regs) ? PERF_RECORD_MISC_USER
101 : PERF_RECORD_MISC_KERNEL;
102 return flags;
103}
104
105unsigned long perf_misc_flags(struct pt_regs *regs)
106{
107
108
109
110
111 if (regs->int_code == 0x1407 && regs->int_parm == CPU_MF_INT_SF_PRA)
112 if (!regs->gprs[15])
113 return perf_misc_flags_sf(regs);
114
115 if (is_in_guest(regs))
116 return perf_misc_guest_flags(regs);
117
118 return user_mode(regs) ? PERF_RECORD_MISC_USER
119 : PERF_RECORD_MISC_KERNEL;
120}
121
122static void print_debug_cf(void)
123{
124 struct cpumf_ctr_info cf_info;
125 int cpu = smp_processor_id();
126
127 memset(&cf_info, 0, sizeof(cf_info));
128 if (!qctri(&cf_info))
129 pr_info("CPU[%i] CPUM_CF: ver=%u.%u A=%04x E=%04x C=%04x\n",
130 cpu, cf_info.cfvn, cf_info.csvn,
131 cf_info.auth_ctl, cf_info.enable_ctl, cf_info.act_ctl);
132}
133
134static void print_debug_sf(void)
135{
136 struct hws_qsi_info_block si;
137 int cpu = smp_processor_id();
138
139 memset(&si, 0, sizeof(si));
140 if (qsi(&si))
141 return;
142
143 pr_info("CPU[%i] CPUM_SF: basic=%i diag=%i min=%lu max=%lu cpu_speed=%u\n",
144 cpu, si.as, si.ad, si.min_sampl_rate, si.max_sampl_rate,
145 si.cpu_speed);
146
147 if (si.as)
148 pr_info("CPU[%i] CPUM_SF: Basic-sampling: a=%i e=%i c=%i"
149 " bsdes=%i tear=%016lx dear=%016lx\n", cpu,
150 si.as, si.es, si.cs, si.bsdes, si.tear, si.dear);
151 if (si.ad)
152 pr_info("CPU[%i] CPUM_SF: Diagnostic-sampling: a=%i e=%i c=%i"
153 " dsdes=%i tear=%016lx dear=%016lx\n", cpu,
154 si.ad, si.ed, si.cd, si.dsdes, si.tear, si.dear);
155}
156
157void perf_event_print_debug(void)
158{
159 unsigned long flags;
160
161 local_irq_save(flags);
162 if (cpum_cf_avail())
163 print_debug_cf();
164 if (cpum_sf_avail())
165 print_debug_sf();
166 local_irq_restore(flags);
167}
168
169
170static void sl_print_counter(struct seq_file *m)
171{
172 struct cpumf_ctr_info ci;
173
174 memset(&ci, 0, sizeof(ci));
175 if (qctri(&ci))
176 return;
177
178 seq_printf(m, "CPU-MF: Counter facility: version=%u.%u "
179 "authorization=%04x\n", ci.cfvn, ci.csvn, ci.auth_ctl);
180}
181
182static void sl_print_sampling(struct seq_file *m)
183{
184 struct hws_qsi_info_block si;
185
186 memset(&si, 0, sizeof(si));
187 if (qsi(&si))
188 return;
189
190 if (!si.as && !si.ad)
191 return;
192
193 seq_printf(m, "CPU-MF: Sampling facility: min_rate=%lu max_rate=%lu"
194 " cpu_speed=%u\n", si.min_sampl_rate, si.max_sampl_rate,
195 si.cpu_speed);
196 if (si.as)
197 seq_printf(m, "CPU-MF: Sampling facility: mode=basic"
198 " sample_size=%u\n", si.bsdes);
199 if (si.ad)
200 seq_printf(m, "CPU-MF: Sampling facility: mode=diagnostic"
201 " sample_size=%u\n", si.dsdes);
202}
203
204static void service_level_perf_print(struct seq_file *m,
205 struct service_level *sl)
206{
207 if (cpum_cf_avail())
208 sl_print_counter(m);
209 if (cpum_sf_avail())
210 sl_print_sampling(m);
211}
212
213static struct service_level service_level_perf = {
214 .seq_print = service_level_perf_print,
215};
216
217static int __init service_level_perf_register(void)
218{
219 return register_service_level(&service_level_perf);
220}
221arch_initcall(service_level_perf_register);
222
223void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
224 struct pt_regs *regs)
225{
226 struct unwind_state state;
227 unsigned long addr;
228
229 unwind_for_each_frame(&state, current, regs, 0) {
230 addr = unwind_get_return_address(&state);
231 if (!addr || perf_callchain_store(entry, addr))
232 return;
233 }
234}
235
236
237ssize_t cpumf_events_sysfs_show(struct device *dev,
238 struct device_attribute *attr, char *page)
239{
240 struct perf_pmu_events_attr *pmu_attr;
241
242 pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
243 return sprintf(page, "event=0x%04llx\n", pmu_attr->id);
244}
245
