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
 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 *) &regs->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	/* Check if the cpum_sf PMU has created the pt_regs structure.
108	 * In this case, perf misc flags can be easily extracted.  Otherwise,
109	 * do regular checks on the pt_regs content.
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/* Service level infrastructure */
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
228	unwind_for_each_frame(&state, current, regs, 0)
229		perf_callchain_store(entry, state.ip);
230}
231
232/* Perf definitions for PMU event attributes in sysfs */
233ssize_t cpumf_events_sysfs_show(struct device *dev,
234				struct device_attribute *attr, char *page)
235{
236	struct perf_pmu_events_attr *pmu_attr;
237
238	pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
239	return sprintf(page, "event=0x%04llx\n", pmu_attr->id);
240}