1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Performance event support for s390x
  4 *
  5 *  Copyright IBM Corp. 2012, 2013
  6 *  Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
  7 */
  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
 26static struct kvm_s390_sie_block *sie_block(struct pt_regs *regs)
 27{
 28	struct stack_frame *stack = (struct stack_frame *) regs->gprs[15];
 29
 30	if (!stack)
 31		return NULL;
 32
 33	return (struct kvm_s390_sie_block *)stack->sie_control_block;
 34}
 35
 36static bool is_in_guest(struct pt_regs *regs)
 37{
 38	if (user_mode(regs))
 39		return false;
 40#if IS_ENABLED(CONFIG_KVM)
 41	return instruction_pointer(regs) == (unsigned long) &sie_exit;
 42#else
 43	return false;
 44#endif
 45}
 46
 47static unsigned long guest_is_user_mode(struct pt_regs *regs)
 48{
 49	return sie_block(regs)->gpsw.mask & PSW_MASK_PSTATE;
 50}
 51
 52static unsigned long instruction_pointer_guest(struct pt_regs *regs)
 53{
 54	return sie_block(regs)->gpsw.addr;
 55}
 56
 57unsigned long perf_instruction_pointer(struct pt_regs *regs)
 58{
 59	return is_in_guest(regs) ? instruction_pointer_guest(regs)
 60				 : instruction_pointer(regs);
 61}
 62
 63static unsigned long perf_misc_guest_flags(struct pt_regs *regs)
 64{
 65	return guest_is_user_mode(regs) ? PERF_RECORD_MISC_GUEST_USER
 66					: PERF_RECORD_MISC_GUEST_KERNEL;
 67}
 68
 69static unsigned long perf_misc_flags_sf(struct pt_regs *regs)
 70{
 71	struct perf_sf_sde_regs *sde_regs;
 72	unsigned long flags;
 73
 74	sde_regs = (struct perf_sf_sde_regs *) &regs->int_parm_long;
 75	if (sde_regs->in_guest)
 76		flags = user_mode(regs) ? PERF_RECORD_MISC_GUEST_USER
 77					: PERF_RECORD_MISC_GUEST_KERNEL;
 78	else
 79		flags = user_mode(regs) ? PERF_RECORD_MISC_USER
 80					: PERF_RECORD_MISC_KERNEL;
 81	return flags;
 82}
 83
 84unsigned long perf_misc_flags(struct pt_regs *regs)
 85{
 86	/* Check if the cpum_sf PMU has created the pt_regs structure.
 87	 * In this case, perf misc flags can be easily extracted.  Otherwise,
 88	 * do regular checks on the pt_regs content.
 89	 */
 90	if (regs->int_code == 0x1407 && regs->int_parm == CPU_MF_INT_SF_PRA)
 91		if (!regs->gprs[15])
 92			return perf_misc_flags_sf(regs);
 93
 94	if (is_in_guest(regs))
 95		return perf_misc_guest_flags(regs);
 96
 97	return user_mode(regs) ? PERF_RECORD_MISC_USER
 98			       : PERF_RECORD_MISC_KERNEL;
 99}
100
101static void print_debug_cf(void)
102{
103	struct cpumf_ctr_info cf_info;
104	int cpu = smp_processor_id();
105
106	memset(&cf_info, 0, sizeof(cf_info));
107	if (!qctri(&cf_info))
108		pr_info("CPU[%i] CPUM_CF: ver=%u.%u A=%04x E=%04x C=%04x\n",
109			cpu, cf_info.cfvn, cf_info.csvn,
110			cf_info.auth_ctl, cf_info.enable_ctl, cf_info.act_ctl);
111}
112
113static void print_debug_sf(void)
114{
115	struct hws_qsi_info_block si;
116	int cpu = smp_processor_id();
117
118	memset(&si, 0, sizeof(si));
119	if (qsi(&si))
120		return;
121
122	pr_info("CPU[%i] CPUM_SF: basic=%i diag=%i min=%lu max=%lu cpu_speed=%u\n",
123		cpu, si.as, si.ad, si.min_sampl_rate, si.max_sampl_rate,
124		si.cpu_speed);
125
126	if (si.as)
127		pr_info("CPU[%i] CPUM_SF: Basic-sampling: a=%i e=%i c=%i"
128			" bsdes=%i tear=%016lx dear=%016lx\n", cpu,
129			si.as, si.es, si.cs, si.bsdes, si.tear, si.dear);
130	if (si.ad)
131		pr_info("CPU[%i] CPUM_SF: Diagnostic-sampling: a=%i e=%i c=%i"
132			" dsdes=%i tear=%016lx dear=%016lx\n", cpu,
133			si.ad, si.ed, si.cd, si.dsdes, si.tear, si.dear);
134}
135
136void perf_event_print_debug(void)
137{
138	unsigned long flags;
139
140	local_irq_save(flags);
141	if (cpum_cf_avail())
142		print_debug_cf();
143	if (cpum_sf_avail())
144		print_debug_sf();
145	local_irq_restore(flags);
146}
147
148/* Service level infrastructure */
149static void sl_print_counter(struct seq_file *m)
150{
151	struct cpumf_ctr_info ci;
152
153	memset(&ci, 0, sizeof(ci));
154	if (qctri(&ci))
155		return;
156
157	seq_printf(m, "CPU-MF: Counter facility: version=%u.%u "
158		   "authorization=%04x\n", ci.cfvn, ci.csvn, ci.auth_ctl);
159}
160
161static void sl_print_sampling(struct seq_file *m)
162{
163	struct hws_qsi_info_block si;
164
165	memset(&si, 0, sizeof(si));
166	if (qsi(&si))
167		return;
168
169	if (!si.as && !si.ad)
170		return;
171
172	seq_printf(m, "CPU-MF: Sampling facility: min_rate=%lu max_rate=%lu"
173		   " cpu_speed=%u\n", si.min_sampl_rate, si.max_sampl_rate,
174		   si.cpu_speed);
175	if (si.as)
176		seq_printf(m, "CPU-MF: Sampling facility: mode=basic"
177			   " sample_size=%u\n", si.bsdes);
178	if (si.ad)
179		seq_printf(m, "CPU-MF: Sampling facility: mode=diagnostic"
180			   " sample_size=%u\n", si.dsdes);
181}
182
183static void service_level_perf_print(struct seq_file *m,
184				     struct service_level *sl)
185{
186	if (cpum_cf_avail())
187		sl_print_counter(m);
188	if (cpum_sf_avail())
189		sl_print_sampling(m);
190}
191
192static struct service_level service_level_perf = {
193	.seq_print = service_level_perf_print,
194};
195
196static int __init service_level_perf_register(void)
197{
198	return register_service_level(&service_level_perf);
199}
200arch_initcall(service_level_perf_register);
201
 
 
 
 
 
 
 
 
202void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
203			   struct pt_regs *regs)
204{
205	struct unwind_state state;
206	unsigned long addr;
207
208	unwind_for_each_frame(&state, current, regs, 0) {
209		addr = unwind_get_return_address(&state);
210		if (!addr || perf_callchain_store(entry, addr))
211			return;
212	}
213}
214
215/* Perf definitions for PMU event attributes in sysfs */
216ssize_t cpumf_events_sysfs_show(struct device *dev,
217				struct device_attribute *attr, char *page)
218{
219	struct perf_pmu_events_attr *pmu_attr;
220
221	pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
222	return sprintf(page, "event=0x%04llx\n", pmu_attr->id);
223}

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Performance event support for s390x
  4 *
  5 *  Copyright IBM Corp. 2012, 2013
  6 *  Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
  7 */
  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 *) &regs->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	/* Check if the cpum_sf PMU has created the pt_regs structure.
107	 * In this case, perf misc flags can be easily extracted.  Otherwise,
108	 * do regular checks on the pt_regs content.
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/* Service level infrastructure */
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/* Perf definitions for PMU event attributes in sysfs */
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}