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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
25const char *perf_pmu_name(void)
26{
27 if (cpum_cf_avail() || cpum_sf_avail())
28 return "CPU-Measurement Facilities (CPU-MF)";
29 return "pmu";
30}
31EXPORT_SYMBOL(perf_pmu_name);
32
33int perf_num_counters(void)
34{
35 int num = 0;
36
37 if (cpum_cf_avail())
38 num += PERF_CPUM_CF_MAX_CTR;
39 if (cpum_sf_avail())
40 num += PERF_CPUM_SF_MAX_CTR;
41
42 return num;
43}
44EXPORT_SYMBOL(perf_num_counters);
45
46static struct kvm_s390_sie_block *sie_block(struct pt_regs *regs)
47{
48 struct stack_frame *stack = (struct stack_frame *) regs->gprs[15];
49
50 if (!stack)
51 return NULL;
52
53 return (struct kvm_s390_sie_block *) stack->empty1[0];
54}
55
56static bool is_in_guest(struct pt_regs *regs)
57{
58 if (user_mode(regs))
59 return false;
60#if IS_ENABLED(CONFIG_KVM)
61 return instruction_pointer(regs) == (unsigned long) &sie_exit;
62#else
63 return false;
64#endif
65}
66
67static unsigned long guest_is_user_mode(struct pt_regs *regs)
68{
69 return sie_block(regs)->gpsw.mask & PSW_MASK_PSTATE;
70}
71
72static unsigned long instruction_pointer_guest(struct pt_regs *regs)
73{
74 return sie_block(regs)->gpsw.addr;
75}
76
77unsigned long perf_instruction_pointer(struct pt_regs *regs)
78{
79 return is_in_guest(regs) ? instruction_pointer_guest(regs)
80 : instruction_pointer(regs);
81}
82
83static unsigned long perf_misc_guest_flags(struct pt_regs *regs)
84{
85 return guest_is_user_mode(regs) ? PERF_RECORD_MISC_GUEST_USER
86 : PERF_RECORD_MISC_GUEST_KERNEL;
87}
88
89static unsigned long perf_misc_flags_sf(struct pt_regs *regs)
90{
91 struct perf_sf_sde_regs *sde_regs;
92 unsigned long flags;
93
94 sde_regs = (struct perf_sf_sde_regs *) ®s->int_parm_long;
95 if (sde_regs->in_guest)
96 flags = user_mode(regs) ? PERF_RECORD_MISC_GUEST_USER
97 : PERF_RECORD_MISC_GUEST_KERNEL;
98 else
99 flags = user_mode(regs) ? PERF_RECORD_MISC_USER
100 : PERF_RECORD_MISC_KERNEL;
101 return flags;
102}
103
104unsigned long perf_misc_flags(struct pt_regs *regs)
105{
106
107
108
109
110 if (regs->int_code == 0x1407 && regs->int_parm == CPU_MF_INT_SF_PRA)
111 if (!regs->gprs[15])
112 return perf_misc_flags_sf(regs);
113
114 if (is_in_guest(regs))
115 return perf_misc_guest_flags(regs);
116
117 return user_mode(regs) ? PERF_RECORD_MISC_USER
118 : PERF_RECORD_MISC_KERNEL;
119}
120
121static void print_debug_cf(void)
122{
123 struct cpumf_ctr_info cf_info;
124 int cpu = smp_processor_id();
125
126 memset(&cf_info, 0, sizeof(cf_info));
127 if (!qctri(&cf_info))
128 pr_info("CPU[%i] CPUM_CF: ver=%u.%u A=%04x E=%04x C=%04x\n",
129 cpu, cf_info.cfvn, cf_info.csvn,
130 cf_info.auth_ctl, cf_info.enable_ctl, cf_info.act_ctl);
131}
132
133static void print_debug_sf(void)
134{
135 struct hws_qsi_info_block si;
136 int cpu = smp_processor_id();
137
138 memset(&si, 0, sizeof(si));
139 if (qsi(&si))
140 return;
141
142 pr_info("CPU[%i] CPUM_SF: basic=%i diag=%i min=%lu max=%lu cpu_speed=%u\n",
143 cpu, si.as, si.ad, si.min_sampl_rate, si.max_sampl_rate,
144 si.cpu_speed);
145
146 if (si.as)
147 pr_info("CPU[%i] CPUM_SF: Basic-sampling: a=%i e=%i c=%i"
148 " bsdes=%i tear=%016lx dear=%016lx\n", cpu,
149 si.as, si.es, si.cs, si.bsdes, si.tear, si.dear);
150 if (si.ad)
151 pr_info("CPU[%i] CPUM_SF: Diagnostic-sampling: a=%i e=%i c=%i"
152 " dsdes=%i tear=%016lx dear=%016lx\n", cpu,
153 si.ad, si.ed, si.cd, si.dsdes, si.tear, si.dear);
154}
155
156void perf_event_print_debug(void)
157{
158 unsigned long flags;
159
160 local_irq_save(flags);
161 if (cpum_cf_avail())
162 print_debug_cf();
163 if (cpum_sf_avail())
164 print_debug_sf();
165 local_irq_restore(flags);
166}
167
168
169static void sl_print_counter(struct seq_file *m)
170{
171 struct cpumf_ctr_info ci;
172
173 memset(&ci, 0, sizeof(ci));
174 if (qctri(&ci))
175 return;
176
177 seq_printf(m, "CPU-MF: Counter facility: version=%u.%u "
178 "authorization=%04x\n", ci.cfvn, ci.csvn, ci.auth_ctl);
179}
180
181static void sl_print_sampling(struct seq_file *m)
182{
183 struct hws_qsi_info_block si;
184
185 memset(&si, 0, sizeof(si));
186 if (qsi(&si))
187 return;
188
189 if (!si.as && !si.ad)
190 return;
191
192 seq_printf(m, "CPU-MF: Sampling facility: min_rate=%lu max_rate=%lu"
193 " cpu_speed=%u\n", si.min_sampl_rate, si.max_sampl_rate,
194 si.cpu_speed);
195 if (si.as)
196 seq_printf(m, "CPU-MF: Sampling facility: mode=basic"
197 " sample_size=%u\n", si.bsdes);
198 if (si.ad)
199 seq_printf(m, "CPU-MF: Sampling facility: mode=diagnostic"
200 " sample_size=%u\n", si.dsdes);
201}
202
203static void service_level_perf_print(struct seq_file *m,
204 struct service_level *sl)
205{
206 if (cpum_cf_avail())
207 sl_print_counter(m);
208 if (cpum_sf_avail())
209 sl_print_sampling(m);
210}
211
212static struct service_level service_level_perf = {
213 .seq_print = service_level_perf_print,
214};
215
216static int __init service_level_perf_register(void)
217{
218 return register_service_level(&service_level_perf);
219}
220arch_initcall(service_level_perf_register);
221
222static int __perf_callchain_kernel(void *data, unsigned long address, int reliable)
223{
224 struct perf_callchain_entry_ctx *entry = data;
225
226 perf_callchain_store(entry, address);
227 return 0;
228}
229
230void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
231 struct pt_regs *regs)
232{
233 if (user_mode(regs))
234 return;
235 dump_trace(__perf_callchain_kernel, entry, NULL, regs->gprs[15]);
236}
237
238
239ssize_t cpumf_events_sysfs_show(struct device *dev,
240 struct device_attribute *attr, char *page)
241{
242 struct perf_pmu_events_attr *pmu_attr;
243
244 pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
245 return sprintf(page, "event=0x%04llx\n", pmu_attr->id);
246}
247
