1 // SPDX-License-Identifier: GPL-2.0
2 /* sysfs.c: Topology sysfs support code for sparc64.
3 *
4 * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
5 */
6 #include <linux/sched.h>
7 #include <linux/device.h>
8 #include <linux/cpu.h>
9 #include <linux/smp.h>
10 #include <linux/percpu.h>
11 #include <linux/init.h>
12
13 #include <asm/cpudata.h>
14 #include <asm/hypervisor.h>
15 #include <asm/spitfire.h>
16
17 static DEFINE_PER_CPU(struct hv_mmu_statistics, mmu_stats) __attribute__((aligned(64)));
18
19 #define SHOW_MMUSTAT_ULONG(NAME) \
20 static ssize_t show_##NAME(struct device *dev, \
21 struct device_attribute *attr, char *buf) \
22 { \
23 struct hv_mmu_statistics *p = &per_cpu(mmu_stats, dev->id); \
24 return sprintf(buf, "%lu\n", p->NAME); \
25 } \
26 static DEVICE_ATTR(NAME, 0444, show_##NAME, NULL)
27
28 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctx0_8k_tte);
29 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctx0_8k_tte);
30 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctx0_64k_tte);
31 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctx0_64k_tte);
32 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctx0_4mb_tte);
33 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctx0_4mb_tte);
34 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctx0_256mb_tte);
35 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctx0_256mb_tte);
36 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctxnon0_8k_tte);
37 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctxnon0_8k_tte);
38 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctxnon0_64k_tte);
39 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctxnon0_64k_tte);
40 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctxnon0_4mb_tte);
41 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctxnon0_4mb_tte);
42 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctxnon0_256mb_tte);
43 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctxnon0_256mb_tte);
44 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctx0_8k_tte);
45 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctx0_8k_tte);
46 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctx0_64k_tte);
47 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctx0_64k_tte);
48 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctx0_4mb_tte);
49 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctx0_4mb_tte);
50 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctx0_256mb_tte);
51 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctx0_256mb_tte);
52 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctxnon0_8k_tte);
53 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctxnon0_8k_tte);
54 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctxnon0_64k_tte);
55 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctxnon0_64k_tte);
56 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctxnon0_4mb_tte);
57 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctxnon0_4mb_tte);
58 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctxnon0_256mb_tte);
59 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctxnon0_256mb_tte);
60
61 static struct attribute *mmu_stat_attrs[] = {
62 &dev_attr_immu_tsb_hits_ctx0_8k_tte.attr,
63 &dev_attr_immu_tsb_ticks_ctx0_8k_tte.attr,
64 &dev_attr_immu_tsb_hits_ctx0_64k_tte.attr,
65 &dev_attr_immu_tsb_ticks_ctx0_64k_tte.attr,
66 &dev_attr_immu_tsb_hits_ctx0_4mb_tte.attr,
67 &dev_attr_immu_tsb_ticks_ctx0_4mb_tte.attr,
68 &dev_attr_immu_tsb_hits_ctx0_256mb_tte.attr,
69 &dev_attr_immu_tsb_ticks_ctx0_256mb_tte.attr,
70 &dev_attr_immu_tsb_hits_ctxnon0_8k_tte.attr,
71 &dev_attr_immu_tsb_ticks_ctxnon0_8k_tte.attr,
72 &dev_attr_immu_tsb_hits_ctxnon0_64k_tte.attr,
73 &dev_attr_immu_tsb_ticks_ctxnon0_64k_tte.attr,
74 &dev_attr_immu_tsb_hits_ctxnon0_4mb_tte.attr,
75 &dev_attr_immu_tsb_ticks_ctxnon0_4mb_tte.attr,
76 &dev_attr_immu_tsb_hits_ctxnon0_256mb_tte.attr,
77 &dev_attr_immu_tsb_ticks_ctxnon0_256mb_tte.attr,
78 &dev_attr_dmmu_tsb_hits_ctx0_8k_tte.attr,
79 &dev_attr_dmmu_tsb_ticks_ctx0_8k_tte.attr,
80 &dev_attr_dmmu_tsb_hits_ctx0_64k_tte.attr,
81 &dev_attr_dmmu_tsb_ticks_ctx0_64k_tte.attr,
82 &dev_attr_dmmu_tsb_hits_ctx0_4mb_tte.attr,
83 &dev_attr_dmmu_tsb_ticks_ctx0_4mb_tte.attr,
84 &dev_attr_dmmu_tsb_hits_ctx0_256mb_tte.attr,
85 &dev_attr_dmmu_tsb_ticks_ctx0_256mb_tte.attr,
86 &dev_attr_dmmu_tsb_hits_ctxnon0_8k_tte.attr,
87 &dev_attr_dmmu_tsb_ticks_ctxnon0_8k_tte.attr,
88 &dev_attr_dmmu_tsb_hits_ctxnon0_64k_tte.attr,
89 &dev_attr_dmmu_tsb_ticks_ctxnon0_64k_tte.attr,
90 &dev_attr_dmmu_tsb_hits_ctxnon0_4mb_tte.attr,
91 &dev_attr_dmmu_tsb_ticks_ctxnon0_4mb_tte.attr,
92 &dev_attr_dmmu_tsb_hits_ctxnon0_256mb_tte.attr,
93 &dev_attr_dmmu_tsb_ticks_ctxnon0_256mb_tte.attr,
94 NULL,
95 };
96
97 static struct attribute_group mmu_stat_group = {
98 .attrs = mmu_stat_attrs,
99 .name = "mmu_stats",
100 };
101
102 static long read_mmustat_enable(void *data __maybe_unused)
103 {
104 unsigned long ra = 0;
105
106 sun4v_mmustat_info(&ra);
107
108 return ra != 0;
109 }
110
111 static long write_mmustat_enable(void *data)
112 {
113 unsigned long ra, orig_ra, *val = data;
114
115 if (*val)
116 ra = __pa(&per_cpu(mmu_stats, smp_processor_id()));
117 else
118 ra = 0UL;
119
120 return sun4v_mmustat_conf(ra, &orig_ra);
121 }
122
123 static ssize_t show_mmustat_enable(struct device *s,
124 struct device_attribute *attr, char *buf)
125 {
126 long val = work_on_cpu(s->id, read_mmustat_enable, NULL);
127
128 return sprintf(buf, "%lx\n", val);
129 }
130
131 static ssize_t store_mmustat_enable(struct device *s,
132 struct device_attribute *attr, const char *buf,
133 size_t count)
134 {
135 unsigned long val;
136 long err;
137 int ret;
138
139 ret = sscanf(buf, "%lu", &val);
140 if (ret != 1)
141 return -EINVAL;
142
143 err = work_on_cpu(s->id, write_mmustat_enable, &val);
144 if (err)
145 return -EIO;
146
147 return count;
148 }
149
150 static DEVICE_ATTR(mmustat_enable, 0644, show_mmustat_enable, store_mmustat_enable);
151
152 static int mmu_stats_supported;
153
154 static int register_mmu_stats(struct device *s)
155 {
156 if (!mmu_stats_supported)
157 return 0;
158 device_create_file(s, &dev_attr_mmustat_enable);
159 return sysfs_create_group(&s->kobj, &mmu_stat_group);
160 }
161
162 #ifdef CONFIG_HOTPLUG_CPU
163 static void unregister_mmu_stats(struct device *s)
164 {
165 if (!mmu_stats_supported)
166 return;
167 sysfs_remove_group(&s->kobj, &mmu_stat_group);
168 device_remove_file(s, &dev_attr_mmustat_enable);
169 }
170 #endif
171
172 #define SHOW_CPUDATA_ULONG_NAME(NAME, MEMBER) \
173 static ssize_t show_##NAME(struct device *dev, \
174 struct device_attribute *attr, char *buf) \
175 { \
176 cpuinfo_sparc *c = &cpu_data(dev->id); \
177 return sprintf(buf, "%lu\n", c->MEMBER); \
178 }
179
180 #define SHOW_CPUDATA_UINT_NAME(NAME, MEMBER) \
181 static ssize_t show_##NAME(struct device *dev, \
182 struct device_attribute *attr, char *buf) \
183 { \
184 cpuinfo_sparc *c = &cpu_data(dev->id); \
185 return sprintf(buf, "%u\n", c->MEMBER); \
186 }
187
188 SHOW_CPUDATA_ULONG_NAME(clock_tick, clock_tick);
189 SHOW_CPUDATA_UINT_NAME(l1_dcache_size, dcache_size);
190 SHOW_CPUDATA_UINT_NAME(l1_dcache_line_size, dcache_line_size);
191 SHOW_CPUDATA_UINT_NAME(l1_icache_size, icache_size);
192 SHOW_CPUDATA_UINT_NAME(l1_icache_line_size, icache_line_size);
193 SHOW_CPUDATA_UINT_NAME(l2_cache_size, ecache_size);
194 SHOW_CPUDATA_UINT_NAME(l2_cache_line_size, ecache_line_size);
195
196 static struct device_attribute cpu_core_attrs[] = {
197 __ATTR(clock_tick, 0444, show_clock_tick, NULL),
198 __ATTR(l1_dcache_size, 0444, show_l1_dcache_size, NULL),
199 __ATTR(l1_dcache_line_size, 0444, show_l1_dcache_line_size, NULL),
200 __ATTR(l1_icache_size, 0444, show_l1_icache_size, NULL),
201 __ATTR(l1_icache_line_size, 0444, show_l1_icache_line_size, NULL),
202 __ATTR(l2_cache_size, 0444, show_l2_cache_size, NULL),
203 __ATTR(l2_cache_line_size, 0444, show_l2_cache_line_size, NULL),
204 };
205
206 static DEFINE_PER_CPU(struct cpu, cpu_devices);
207
208 static int register_cpu_online(unsigned int cpu)
209 {
210 struct cpu *c = &per_cpu(cpu_devices, cpu);
211 struct device *s = &c->dev;
212 int i;
213
214 for (i = 0; i < ARRAY_SIZE(cpu_core_attrs); i++)
215 device_create_file(s, &cpu_core_attrs[i]);
216
217 register_mmu_stats(s);
218 return 0;
219 }
220
221 static int unregister_cpu_online(unsigned int cpu)
222 {
223 #ifdef CONFIG_HOTPLUG_CPU
224 struct cpu *c = &per_cpu(cpu_devices, cpu);
225 struct device *s = &c->dev;
226 int i;
227
228 unregister_mmu_stats(s);
229 for (i = 0; i < ARRAY_SIZE(cpu_core_attrs); i++)
230 device_remove_file(s, &cpu_core_attrs[i]);
231 #endif
232 return 0;
233 }
234
235 static void __init check_mmu_stats(void)
236 {
237 unsigned long dummy1, err;
238
239 if (tlb_type != hypervisor)
240 return;
241
242 err = sun4v_mmustat_info(&dummy1);
243 if (!err)
244 mmu_stats_supported = 1;
245 }
246
247 static int __init topology_init(void)
248 {
249 int cpu, ret;
250
251 check_mmu_stats();
252
253 for_each_possible_cpu(cpu) {
254 struct cpu *c = &per_cpu(cpu_devices, cpu);
255
256 register_cpu(c, cpu);
257 }
258
259 ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "sparc/topology:online",
260 register_cpu_online, unregister_cpu_online);
261 WARN_ON(ret < 0);
262 return 0;
263 }
264
265 subsys_initcall(topology_init);
266
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