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