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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Hypervisor filesystem for Linux on s390. z/VM implementation.
4 *
5 * Copyright IBM Corp. 2006
6 * Author(s): Michael Holzheu <holzheu@de.ibm.com>
7 */
8
9#include <linux/types.h>
10#include <linux/errno.h>
11#include <linux/string.h>
12#include <linux/vmalloc.h>
13#include <asm/extable.h>
14#include <asm/diag.h>
15#include <asm/ebcdic.h>
16#include <asm/timex.h>
17#include "hypfs.h"
18
19#define NAME_LEN 8
20#define DBFS_D2FC_HDR_VERSION 0
21
22static char local_guest[] = " ";
23static char all_guests[] = "* ";
24static char *all_groups = all_guests;
25static char *guest_query;
26
27struct diag2fc_data {
28 __u32 version;
29 __u32 flags;
30 __u64 used_cpu;
31 __u64 el_time;
32 __u64 mem_min_kb;
33 __u64 mem_max_kb;
34 __u64 mem_share_kb;
35 __u64 mem_used_kb;
36 __u32 pcpus;
37 __u32 lcpus;
38 __u32 vcpus;
39 __u32 ocpus;
40 __u32 cpu_max;
41 __u32 cpu_shares;
42 __u32 cpu_use_samp;
43 __u32 cpu_delay_samp;
44 __u32 page_wait_samp;
45 __u32 idle_samp;
46 __u32 other_samp;
47 __u32 total_samp;
48 char guest_name[NAME_LEN];
49};
50
51struct diag2fc_parm_list {
52 char userid[NAME_LEN];
53 char aci_grp[NAME_LEN];
54 __u64 addr;
55 __u32 size;
56 __u32 fmt;
57};
58
59static int diag2fc(int size, char* query, void *addr)
60{
61 unsigned long residual_cnt;
62 unsigned long rc;
63 struct diag2fc_parm_list parm_list;
64
65 memcpy(parm_list.userid, query, NAME_LEN);
66 ASCEBC(parm_list.userid, NAME_LEN);
67 memcpy(parm_list.aci_grp, all_groups, NAME_LEN);
68 ASCEBC(parm_list.aci_grp, NAME_LEN);
69 parm_list.addr = (unsigned long)addr;
70 parm_list.size = size;
71 parm_list.fmt = 0x02;
72 rc = -1;
73
74 diag_stat_inc(DIAG_STAT_X2FC);
75 asm volatile(
76 " diag %0,%1,0x2fc\n"
77 "0: nopr %%r7\n"
78 EX_TABLE(0b,0b)
79 : "=d" (residual_cnt), "+d" (rc) : "0" (&parm_list) : "memory");
80
81 if ((rc != 0 ) && (rc != -2))
82 return rc;
83 else
84 return -residual_cnt;
85}
86
87/*
88 * Allocate buffer for "query" and store diag 2fc at "offset"
89 */
90static void *diag2fc_store(char *query, unsigned int *count, int offset)
91{
92 void *data;
93 int size;
94
95 do {
96 size = diag2fc(0, query, NULL);
97 if (size < 0)
98 return ERR_PTR(-EACCES);
99 data = vmalloc(size + offset);
100 if (!data)
101 return ERR_PTR(-ENOMEM);
102 if (diag2fc(size, query, data + offset) == 0)
103 break;
104 vfree(data);
105 } while (1);
106 *count = (size / sizeof(struct diag2fc_data));
107
108 return data;
109}
110
111static void diag2fc_free(const void *data)
112{
113 vfree(data);
114}
115
116#define ATTRIBUTE(dir, name, member) \
117do { \
118 void *rc; \
119 rc = hypfs_create_u64(dir, name, member); \
120 if (IS_ERR(rc)) \
121 return PTR_ERR(rc); \
122} while(0)
123
124static int hypfs_vm_create_guest(struct dentry *systems_dir,
125 struct diag2fc_data *data)
126{
127 char guest_name[NAME_LEN + 1] = {};
128 struct dentry *guest_dir, *cpus_dir, *samples_dir, *mem_dir;
129 int dedicated_flag, capped_value;
130
131 capped_value = (data->flags & 0x00000006) >> 1;
132 dedicated_flag = (data->flags & 0x00000008) >> 3;
133
134 /* guest dir */
135 memcpy(guest_name, data->guest_name, NAME_LEN);
136 EBCASC(guest_name, NAME_LEN);
137 strim(guest_name);
138 guest_dir = hypfs_mkdir(systems_dir, guest_name);
139 if (IS_ERR(guest_dir))
140 return PTR_ERR(guest_dir);
141 ATTRIBUTE(guest_dir, "onlinetime_us", data->el_time);
142
143 /* logical cpu information */
144 cpus_dir = hypfs_mkdir(guest_dir, "cpus");
145 if (IS_ERR(cpus_dir))
146 return PTR_ERR(cpus_dir);
147 ATTRIBUTE(cpus_dir, "cputime_us", data->used_cpu);
148 ATTRIBUTE(cpus_dir, "capped", capped_value);
149 ATTRIBUTE(cpus_dir, "dedicated", dedicated_flag);
150 ATTRIBUTE(cpus_dir, "count", data->vcpus);
151 /*
152 * Note: The "weight_min" attribute got the wrong name.
153 * The value represents the number of non-stopped (operating)
154 * CPUS.
155 */
156 ATTRIBUTE(cpus_dir, "weight_min", data->ocpus);
157 ATTRIBUTE(cpus_dir, "weight_max", data->cpu_max);
158 ATTRIBUTE(cpus_dir, "weight_cur", data->cpu_shares);
159
160 /* memory information */
161 mem_dir = hypfs_mkdir(guest_dir, "mem");
162 if (IS_ERR(mem_dir))
163 return PTR_ERR(mem_dir);
164 ATTRIBUTE(mem_dir, "min_KiB", data->mem_min_kb);
165 ATTRIBUTE(mem_dir, "max_KiB", data->mem_max_kb);
166 ATTRIBUTE(mem_dir, "used_KiB", data->mem_used_kb);
167 ATTRIBUTE(mem_dir, "share_KiB", data->mem_share_kb);
168
169 /* samples */
170 samples_dir = hypfs_mkdir(guest_dir, "samples");
171 if (IS_ERR(samples_dir))
172 return PTR_ERR(samples_dir);
173 ATTRIBUTE(samples_dir, "cpu_using", data->cpu_use_samp);
174 ATTRIBUTE(samples_dir, "cpu_delay", data->cpu_delay_samp);
175 ATTRIBUTE(samples_dir, "mem_delay", data->page_wait_samp);
176 ATTRIBUTE(samples_dir, "idle", data->idle_samp);
177 ATTRIBUTE(samples_dir, "other", data->other_samp);
178 ATTRIBUTE(samples_dir, "total", data->total_samp);
179 return 0;
180}
181
182int hypfs_vm_create_files(struct dentry *root)
183{
184 struct dentry *dir, *file;
185 struct diag2fc_data *data;
186 unsigned int count = 0;
187 int rc, i;
188
189 data = diag2fc_store(guest_query, &count, 0);
190 if (IS_ERR(data))
191 return PTR_ERR(data);
192
193 /* Hypervisor Info */
194 dir = hypfs_mkdir(root, "hyp");
195 if (IS_ERR(dir)) {
196 rc = PTR_ERR(dir);
197 goto failed;
198 }
199 file = hypfs_create_str(dir, "type", "z/VM Hypervisor");
200 if (IS_ERR(file)) {
201 rc = PTR_ERR(file);
202 goto failed;
203 }
204
205 /* physical cpus */
206 dir = hypfs_mkdir(root, "cpus");
207 if (IS_ERR(dir)) {
208 rc = PTR_ERR(dir);
209 goto failed;
210 }
211 file = hypfs_create_u64(dir, "count", data->lcpus);
212 if (IS_ERR(file)) {
213 rc = PTR_ERR(file);
214 goto failed;
215 }
216
217 /* guests */
218 dir = hypfs_mkdir(root, "systems");
219 if (IS_ERR(dir)) {
220 rc = PTR_ERR(dir);
221 goto failed;
222 }
223
224 for (i = 0; i < count; i++) {
225 rc = hypfs_vm_create_guest(dir, &(data[i]));
226 if (rc)
227 goto failed;
228 }
229 diag2fc_free(data);
230 return 0;
231
232failed:
233 diag2fc_free(data);
234 return rc;
235}
236
237struct dbfs_d2fc_hdr {
238 u64 len; /* Length of d2fc buffer without header */
239 u16 version; /* Version of header */
240 union tod_clock tod_ext; /* TOD clock for d2fc */
241 u64 count; /* Number of VM guests in d2fc buffer */
242 char reserved[30];
243} __attribute__ ((packed));
244
245struct dbfs_d2fc {
246 struct dbfs_d2fc_hdr hdr; /* 64 byte header */
247 char buf[]; /* d2fc buffer */
248} __attribute__ ((packed));
249
250static int dbfs_diag2fc_create(void **data, void **data_free_ptr, size_t *size)
251{
252 struct dbfs_d2fc *d2fc;
253 unsigned int count;
254
255 d2fc = diag2fc_store(guest_query, &count, sizeof(d2fc->hdr));
256 if (IS_ERR(d2fc))
257 return PTR_ERR(d2fc);
258 store_tod_clock_ext(&d2fc->hdr.tod_ext);
259 d2fc->hdr.len = count * sizeof(struct diag2fc_data);
260 d2fc->hdr.version = DBFS_D2FC_HDR_VERSION;
261 d2fc->hdr.count = count;
262 memset(&d2fc->hdr.reserved, 0, sizeof(d2fc->hdr.reserved));
263 *data = d2fc;
264 *data_free_ptr = d2fc;
265 *size = d2fc->hdr.len + sizeof(struct dbfs_d2fc_hdr);
266 return 0;
267}
268
269static struct hypfs_dbfs_file dbfs_file_2fc = {
270 .name = "diag_2fc",
271 .data_create = dbfs_diag2fc_create,
272 .data_free = diag2fc_free,
273};
274
275int hypfs_vm_init(void)
276{
277 if (!MACHINE_IS_VM)
278 return 0;
279 if (diag2fc(0, all_guests, NULL) > 0)
280 guest_query = all_guests;
281 else if (diag2fc(0, local_guest, NULL) > 0)
282 guest_query = local_guest;
283 else
284 return -EACCES;
285 hypfs_dbfs_create_file(&dbfs_file_2fc);
286 return 0;
287}
288
289void hypfs_vm_exit(void)
290{
291 if (!MACHINE_IS_VM)
292 return;
293 hypfs_dbfs_remove_file(&dbfs_file_2fc);
294}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Hypervisor filesystem for Linux on s390. z/VM implementation.
4 *
5 * Copyright IBM Corp. 2006
6 * Author(s): Michael Holzheu <holzheu@de.ibm.com>
7 */
8
9#include <linux/types.h>
10#include <linux/errno.h>
11#include <linux/string.h>
12#include <linux/vmalloc.h>
13#include <asm/diag.h>
14#include <asm/ebcdic.h>
15#include <asm/timex.h>
16#include "hypfs.h"
17
18#define NAME_LEN 8
19#define DBFS_D2FC_HDR_VERSION 0
20
21static char local_guest[] = " ";
22static char all_guests[] = "* ";
23static char *guest_query;
24
25struct diag2fc_data {
26 __u32 version;
27 __u32 flags;
28 __u64 used_cpu;
29 __u64 el_time;
30 __u64 mem_min_kb;
31 __u64 mem_max_kb;
32 __u64 mem_share_kb;
33 __u64 mem_used_kb;
34 __u32 pcpus;
35 __u32 lcpus;
36 __u32 vcpus;
37 __u32 ocpus;
38 __u32 cpu_max;
39 __u32 cpu_shares;
40 __u32 cpu_use_samp;
41 __u32 cpu_delay_samp;
42 __u32 page_wait_samp;
43 __u32 idle_samp;
44 __u32 other_samp;
45 __u32 total_samp;
46 char guest_name[NAME_LEN];
47};
48
49struct diag2fc_parm_list {
50 char userid[NAME_LEN];
51 char aci_grp[NAME_LEN];
52 __u64 addr;
53 __u32 size;
54 __u32 fmt;
55};
56
57static int diag2fc(int size, char* query, void *addr)
58{
59 unsigned long residual_cnt;
60 unsigned long rc;
61 struct diag2fc_parm_list parm_list;
62
63 memcpy(parm_list.userid, query, NAME_LEN);
64 ASCEBC(parm_list.userid, NAME_LEN);
65 parm_list.addr = (unsigned long) addr ;
66 parm_list.size = size;
67 parm_list.fmt = 0x02;
68 memset(parm_list.aci_grp, 0x40, NAME_LEN);
69 rc = -1;
70
71 diag_stat_inc(DIAG_STAT_X2FC);
72 asm volatile(
73 " diag %0,%1,0x2fc\n"
74 "0: nopr %%r7\n"
75 EX_TABLE(0b,0b)
76 : "=d" (residual_cnt), "+d" (rc) : "0" (&parm_list) : "memory");
77
78 if ((rc != 0 ) && (rc != -2))
79 return rc;
80 else
81 return -residual_cnt;
82}
83
84/*
85 * Allocate buffer for "query" and store diag 2fc at "offset"
86 */
87static void *diag2fc_store(char *query, unsigned int *count, int offset)
88{
89 void *data;
90 int size;
91
92 do {
93 size = diag2fc(0, query, NULL);
94 if (size < 0)
95 return ERR_PTR(-EACCES);
96 data = vmalloc(size + offset);
97 if (!data)
98 return ERR_PTR(-ENOMEM);
99 if (diag2fc(size, query, data + offset) == 0)
100 break;
101 vfree(data);
102 } while (1);
103 *count = (size / sizeof(struct diag2fc_data));
104
105 return data;
106}
107
108static void diag2fc_free(const void *data)
109{
110 vfree(data);
111}
112
113#define ATTRIBUTE(dir, name, member) \
114do { \
115 void *rc; \
116 rc = hypfs_create_u64(dir, name, member); \
117 if (IS_ERR(rc)) \
118 return PTR_ERR(rc); \
119} while(0)
120
121static int hypfs_vm_create_guest(struct dentry *systems_dir,
122 struct diag2fc_data *data)
123{
124 char guest_name[NAME_LEN + 1] = {};
125 struct dentry *guest_dir, *cpus_dir, *samples_dir, *mem_dir;
126 int dedicated_flag, capped_value;
127
128 capped_value = (data->flags & 0x00000006) >> 1;
129 dedicated_flag = (data->flags & 0x00000008) >> 3;
130
131 /* guest dir */
132 memcpy(guest_name, data->guest_name, NAME_LEN);
133 EBCASC(guest_name, NAME_LEN);
134 strim(guest_name);
135 guest_dir = hypfs_mkdir(systems_dir, guest_name);
136 if (IS_ERR(guest_dir))
137 return PTR_ERR(guest_dir);
138 ATTRIBUTE(guest_dir, "onlinetime_us", data->el_time);
139
140 /* logical cpu information */
141 cpus_dir = hypfs_mkdir(guest_dir, "cpus");
142 if (IS_ERR(cpus_dir))
143 return PTR_ERR(cpus_dir);
144 ATTRIBUTE(cpus_dir, "cputime_us", data->used_cpu);
145 ATTRIBUTE(cpus_dir, "capped", capped_value);
146 ATTRIBUTE(cpus_dir, "dedicated", dedicated_flag);
147 ATTRIBUTE(cpus_dir, "count", data->vcpus);
148 /*
149 * Note: The "weight_min" attribute got the wrong name.
150 * The value represents the number of non-stopped (operating)
151 * CPUS.
152 */
153 ATTRIBUTE(cpus_dir, "weight_min", data->ocpus);
154 ATTRIBUTE(cpus_dir, "weight_max", data->cpu_max);
155 ATTRIBUTE(cpus_dir, "weight_cur", data->cpu_shares);
156
157 /* memory information */
158 mem_dir = hypfs_mkdir(guest_dir, "mem");
159 if (IS_ERR(mem_dir))
160 return PTR_ERR(mem_dir);
161 ATTRIBUTE(mem_dir, "min_KiB", data->mem_min_kb);
162 ATTRIBUTE(mem_dir, "max_KiB", data->mem_max_kb);
163 ATTRIBUTE(mem_dir, "used_KiB", data->mem_used_kb);
164 ATTRIBUTE(mem_dir, "share_KiB", data->mem_share_kb);
165
166 /* samples */
167 samples_dir = hypfs_mkdir(guest_dir, "samples");
168 if (IS_ERR(samples_dir))
169 return PTR_ERR(samples_dir);
170 ATTRIBUTE(samples_dir, "cpu_using", data->cpu_use_samp);
171 ATTRIBUTE(samples_dir, "cpu_delay", data->cpu_delay_samp);
172 ATTRIBUTE(samples_dir, "mem_delay", data->page_wait_samp);
173 ATTRIBUTE(samples_dir, "idle", data->idle_samp);
174 ATTRIBUTE(samples_dir, "other", data->other_samp);
175 ATTRIBUTE(samples_dir, "total", data->total_samp);
176 return 0;
177}
178
179int hypfs_vm_create_files(struct dentry *root)
180{
181 struct dentry *dir, *file;
182 struct diag2fc_data *data;
183 unsigned int count = 0;
184 int rc, i;
185
186 data = diag2fc_store(guest_query, &count, 0);
187 if (IS_ERR(data))
188 return PTR_ERR(data);
189
190 /* Hpervisor Info */
191 dir = hypfs_mkdir(root, "hyp");
192 if (IS_ERR(dir)) {
193 rc = PTR_ERR(dir);
194 goto failed;
195 }
196 file = hypfs_create_str(dir, "type", "z/VM Hypervisor");
197 if (IS_ERR(file)) {
198 rc = PTR_ERR(file);
199 goto failed;
200 }
201
202 /* physical cpus */
203 dir = hypfs_mkdir(root, "cpus");
204 if (IS_ERR(dir)) {
205 rc = PTR_ERR(dir);
206 goto failed;
207 }
208 file = hypfs_create_u64(dir, "count", data->lcpus);
209 if (IS_ERR(file)) {
210 rc = PTR_ERR(file);
211 goto failed;
212 }
213
214 /* guests */
215 dir = hypfs_mkdir(root, "systems");
216 if (IS_ERR(dir)) {
217 rc = PTR_ERR(dir);
218 goto failed;
219 }
220
221 for (i = 0; i < count; i++) {
222 rc = hypfs_vm_create_guest(dir, &(data[i]));
223 if (rc)
224 goto failed;
225 }
226 diag2fc_free(data);
227 return 0;
228
229failed:
230 diag2fc_free(data);
231 return rc;
232}
233
234struct dbfs_d2fc_hdr {
235 u64 len; /* Length of d2fc buffer without header */
236 u16 version; /* Version of header */
237 char tod_ext[STORE_CLOCK_EXT_SIZE]; /* TOD clock for d2fc */
238 u64 count; /* Number of VM guests in d2fc buffer */
239 char reserved[30];
240} __attribute__ ((packed));
241
242struct dbfs_d2fc {
243 struct dbfs_d2fc_hdr hdr; /* 64 byte header */
244 char buf[]; /* d2fc buffer */
245} __attribute__ ((packed));
246
247static int dbfs_diag2fc_create(void **data, void **data_free_ptr, size_t *size)
248{
249 struct dbfs_d2fc *d2fc;
250 unsigned int count;
251
252 d2fc = diag2fc_store(guest_query, &count, sizeof(d2fc->hdr));
253 if (IS_ERR(d2fc))
254 return PTR_ERR(d2fc);
255 get_tod_clock_ext(d2fc->hdr.tod_ext);
256 d2fc->hdr.len = count * sizeof(struct diag2fc_data);
257 d2fc->hdr.version = DBFS_D2FC_HDR_VERSION;
258 d2fc->hdr.count = count;
259 memset(&d2fc->hdr.reserved, 0, sizeof(d2fc->hdr.reserved));
260 *data = d2fc;
261 *data_free_ptr = d2fc;
262 *size = d2fc->hdr.len + sizeof(struct dbfs_d2fc_hdr);
263 return 0;
264}
265
266static struct hypfs_dbfs_file dbfs_file_2fc = {
267 .name = "diag_2fc",
268 .data_create = dbfs_diag2fc_create,
269 .data_free = diag2fc_free,
270};
271
272int hypfs_vm_init(void)
273{
274 if (!MACHINE_IS_VM)
275 return 0;
276 if (diag2fc(0, all_guests, NULL) > 0)
277 guest_query = all_guests;
278 else if (diag2fc(0, local_guest, NULL) > 0)
279 guest_query = local_guest;
280 else
281 return -EACCES;
282 hypfs_dbfs_create_file(&dbfs_file_2fc);
283 return 0;
284}
285
286void hypfs_vm_exit(void)
287{
288 if (!MACHINE_IS_VM)
289 return;
290 hypfs_dbfs_remove_file(&dbfs_file_2fc);
291}