Loading...
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_vm.h"
18#include "hypfs.h"
19
20#define DBFS_D2FC_HDR_VERSION 0
21
22static char local_guest[] = " ";
23static char all_guests[] = "* ";
24static char *all_groups = all_guests;
25char *diag2fc_guest_query;
26
27static int diag2fc(int size, char* query, void *addr)
28{
29 unsigned long residual_cnt;
30 unsigned long rc;
31 struct diag2fc_parm_list parm_list;
32
33 memcpy(parm_list.userid, query, DIAG2FC_NAME_LEN);
34 ASCEBC(parm_list.userid, DIAG2FC_NAME_LEN);
35 memcpy(parm_list.aci_grp, all_groups, DIAG2FC_NAME_LEN);
36 ASCEBC(parm_list.aci_grp, DIAG2FC_NAME_LEN);
37 parm_list.addr = (unsigned long)addr;
38 parm_list.size = size;
39 parm_list.fmt = 0x02;
40 rc = -1;
41
42 diag_stat_inc(DIAG_STAT_X2FC);
43 asm volatile(
44 " diag %0,%1,0x2fc\n"
45 "0: nopr %%r7\n"
46 EX_TABLE(0b,0b)
47 : "=d" (residual_cnt), "+d" (rc) : "0" (&parm_list) : "memory");
48
49 if ((rc != 0 ) && (rc != -2))
50 return rc;
51 else
52 return -residual_cnt;
53}
54
55/*
56 * Allocate buffer for "query" and store diag 2fc at "offset"
57 */
58void *diag2fc_store(char *query, unsigned int *count, int offset)
59{
60 void *data;
61 int size;
62
63 do {
64 size = diag2fc(0, query, NULL);
65 if (size < 0)
66 return ERR_PTR(-EACCES);
67 data = vmalloc(size + offset);
68 if (!data)
69 return ERR_PTR(-ENOMEM);
70 if (diag2fc(size, query, data + offset) == 0)
71 break;
72 vfree(data);
73 } while (1);
74 *count = (size / sizeof(struct diag2fc_data));
75
76 return data;
77}
78
79void diag2fc_free(const void *data)
80{
81 vfree(data);
82}
83
84struct dbfs_d2fc_hdr {
85 u64 len; /* Length of d2fc buffer without header */
86 u16 version; /* Version of header */
87 union tod_clock tod_ext; /* TOD clock for d2fc */
88 u64 count; /* Number of VM guests in d2fc buffer */
89 char reserved[30];
90} __attribute__ ((packed));
91
92struct dbfs_d2fc {
93 struct dbfs_d2fc_hdr hdr; /* 64 byte header */
94 char buf[]; /* d2fc buffer */
95} __attribute__ ((packed));
96
97static int dbfs_diag2fc_create(void **data, void **data_free_ptr, size_t *size)
98{
99 struct dbfs_d2fc *d2fc;
100 unsigned int count;
101
102 d2fc = diag2fc_store(diag2fc_guest_query, &count, sizeof(d2fc->hdr));
103 if (IS_ERR(d2fc))
104 return PTR_ERR(d2fc);
105 store_tod_clock_ext(&d2fc->hdr.tod_ext);
106 d2fc->hdr.len = count * sizeof(struct diag2fc_data);
107 d2fc->hdr.version = DBFS_D2FC_HDR_VERSION;
108 d2fc->hdr.count = count;
109 memset(&d2fc->hdr.reserved, 0, sizeof(d2fc->hdr.reserved));
110 *data = d2fc;
111 *data_free_ptr = d2fc;
112 *size = d2fc->hdr.len + sizeof(struct dbfs_d2fc_hdr);
113 return 0;
114}
115
116static struct hypfs_dbfs_file dbfs_file_2fc = {
117 .name = "diag_2fc",
118 .data_create = dbfs_diag2fc_create,
119 .data_free = diag2fc_free,
120};
121
122int hypfs_vm_init(void)
123{
124 if (!MACHINE_IS_VM)
125 return 0;
126 if (diag2fc(0, all_guests, NULL) > 0)
127 diag2fc_guest_query = all_guests;
128 else if (diag2fc(0, local_guest, NULL) > 0)
129 diag2fc_guest_query = local_guest;
130 else
131 return -EACCES;
132 hypfs_dbfs_create_file(&dbfs_file_2fc);
133 return 0;
134}
135
136void hypfs_vm_exit(void)
137{
138 if (!MACHINE_IS_VM)
139 return;
140 hypfs_dbfs_remove_file(&dbfs_file_2fc);
141}
1/*
2 * Hypervisor filesystem for Linux on s390. z/VM implementation.
3 *
4 * Copyright (C) IBM Corp. 2006
5 * Author(s): Michael Holzheu <holzheu@de.ibm.com>
6 */
7
8#include <linux/types.h>
9#include <linux/errno.h>
10#include <linux/string.h>
11#include <linux/vmalloc.h>
12#include <asm/ebcdic.h>
13#include <asm/timex.h>
14#include "hypfs.h"
15
16#define NAME_LEN 8
17#define DBFS_D2FC_HDR_VERSION 0
18
19static char local_guest[] = " ";
20static char all_guests[] = "* ";
21static char *guest_query;
22
23struct diag2fc_data {
24 __u32 version;
25 __u32 flags;
26 __u64 used_cpu;
27 __u64 el_time;
28 __u64 mem_min_kb;
29 __u64 mem_max_kb;
30 __u64 mem_share_kb;
31 __u64 mem_used_kb;
32 __u32 pcpus;
33 __u32 lcpus;
34 __u32 vcpus;
35 __u32 cpu_min;
36 __u32 cpu_max;
37 __u32 cpu_shares;
38 __u32 cpu_use_samp;
39 __u32 cpu_delay_samp;
40 __u32 page_wait_samp;
41 __u32 idle_samp;
42 __u32 other_samp;
43 __u32 total_samp;
44 char guest_name[NAME_LEN];
45};
46
47struct diag2fc_parm_list {
48 char userid[NAME_LEN];
49 char aci_grp[NAME_LEN];
50 __u64 addr;
51 __u32 size;
52 __u32 fmt;
53};
54
55static int diag2fc(int size, char* query, void *addr)
56{
57 unsigned long residual_cnt;
58 unsigned long rc;
59 struct diag2fc_parm_list parm_list;
60
61 memcpy(parm_list.userid, query, NAME_LEN);
62 ASCEBC(parm_list.userid, NAME_LEN);
63 parm_list.addr = (unsigned long) addr ;
64 parm_list.size = size;
65 parm_list.fmt = 0x02;
66 memset(parm_list.aci_grp, 0x40, NAME_LEN);
67 rc = -1;
68
69 asm volatile(
70 " diag %0,%1,0x2fc\n"
71 "0:\n"
72 EX_TABLE(0b,0b)
73 : "=d" (residual_cnt), "+d" (rc) : "0" (&parm_list) : "memory");
74
75 if ((rc != 0 ) && (rc != -2))
76 return rc;
77 else
78 return -residual_cnt;
79}
80
81/*
82 * Allocate buffer for "query" and store diag 2fc at "offset"
83 */
84static void *diag2fc_store(char *query, unsigned int *count, int offset)
85{
86 void *data;
87 int size;
88
89 do {
90 size = diag2fc(0, query, NULL);
91 if (size < 0)
92 return ERR_PTR(-EACCES);
93 data = vmalloc(size + offset);
94 if (!data)
95 return ERR_PTR(-ENOMEM);
96 if (diag2fc(size, query, data + offset) == 0)
97 break;
98 vfree(data);
99 } while (1);
100 *count = (size / sizeof(struct diag2fc_data));
101
102 return data;
103}
104
105static void diag2fc_free(const void *data)
106{
107 vfree(data);
108}
109
110#define ATTRIBUTE(sb, dir, name, member) \
111do { \
112 void *rc; \
113 rc = hypfs_create_u64(sb, dir, name, member); \
114 if (IS_ERR(rc)) \
115 return PTR_ERR(rc); \
116} while(0)
117
118static int hpyfs_vm_create_guest(struct super_block *sb,
119 struct dentry *systems_dir,
120 struct diag2fc_data *data)
121{
122 char guest_name[NAME_LEN + 1] = {};
123 struct dentry *guest_dir, *cpus_dir, *samples_dir, *mem_dir;
124 int dedicated_flag, capped_value;
125
126 capped_value = (data->flags & 0x00000006) >> 1;
127 dedicated_flag = (data->flags & 0x00000008) >> 3;
128
129 /* guest dir */
130 memcpy(guest_name, data->guest_name, NAME_LEN);
131 EBCASC(guest_name, NAME_LEN);
132 strim(guest_name);
133 guest_dir = hypfs_mkdir(sb, systems_dir, guest_name);
134 if (IS_ERR(guest_dir))
135 return PTR_ERR(guest_dir);
136 ATTRIBUTE(sb, guest_dir, "onlinetime_us", data->el_time);
137
138 /* logical cpu information */
139 cpus_dir = hypfs_mkdir(sb, guest_dir, "cpus");
140 if (IS_ERR(cpus_dir))
141 return PTR_ERR(cpus_dir);
142 ATTRIBUTE(sb, cpus_dir, "cputime_us", data->used_cpu);
143 ATTRIBUTE(sb, cpus_dir, "capped", capped_value);
144 ATTRIBUTE(sb, cpus_dir, "dedicated", dedicated_flag);
145 ATTRIBUTE(sb, cpus_dir, "count", data->vcpus);
146 ATTRIBUTE(sb, cpus_dir, "weight_min", data->cpu_min);
147 ATTRIBUTE(sb, cpus_dir, "weight_max", data->cpu_max);
148 ATTRIBUTE(sb, cpus_dir, "weight_cur", data->cpu_shares);
149
150 /* memory information */
151 mem_dir = hypfs_mkdir(sb, guest_dir, "mem");
152 if (IS_ERR(mem_dir))
153 return PTR_ERR(mem_dir);
154 ATTRIBUTE(sb, mem_dir, "min_KiB", data->mem_min_kb);
155 ATTRIBUTE(sb, mem_dir, "max_KiB", data->mem_max_kb);
156 ATTRIBUTE(sb, mem_dir, "used_KiB", data->mem_used_kb);
157 ATTRIBUTE(sb, mem_dir, "share_KiB", data->mem_share_kb);
158
159 /* samples */
160 samples_dir = hypfs_mkdir(sb, guest_dir, "samples");
161 if (IS_ERR(samples_dir))
162 return PTR_ERR(samples_dir);
163 ATTRIBUTE(sb, samples_dir, "cpu_using", data->cpu_use_samp);
164 ATTRIBUTE(sb, samples_dir, "cpu_delay", data->cpu_delay_samp);
165 ATTRIBUTE(sb, samples_dir, "mem_delay", data->page_wait_samp);
166 ATTRIBUTE(sb, samples_dir, "idle", data->idle_samp);
167 ATTRIBUTE(sb, samples_dir, "other", data->other_samp);
168 ATTRIBUTE(sb, samples_dir, "total", data->total_samp);
169 return 0;
170}
171
172int hypfs_vm_create_files(struct super_block *sb, struct dentry *root)
173{
174 struct dentry *dir, *file;
175 struct diag2fc_data *data;
176 unsigned int count = 0;
177 int rc, i;
178
179 data = diag2fc_store(guest_query, &count, 0);
180 if (IS_ERR(data))
181 return PTR_ERR(data);
182
183 /* Hpervisor Info */
184 dir = hypfs_mkdir(sb, root, "hyp");
185 if (IS_ERR(dir)) {
186 rc = PTR_ERR(dir);
187 goto failed;
188 }
189 file = hypfs_create_str(sb, dir, "type", "z/VM Hypervisor");
190 if (IS_ERR(file)) {
191 rc = PTR_ERR(file);
192 goto failed;
193 }
194
195 /* physical cpus */
196 dir = hypfs_mkdir(sb, root, "cpus");
197 if (IS_ERR(dir)) {
198 rc = PTR_ERR(dir);
199 goto failed;
200 }
201 file = hypfs_create_u64(sb, dir, "count", data->lcpus);
202 if (IS_ERR(file)) {
203 rc = PTR_ERR(file);
204 goto failed;
205 }
206
207 /* guests */
208 dir = hypfs_mkdir(sb, root, "systems");
209 if (IS_ERR(dir)) {
210 rc = PTR_ERR(dir);
211 goto failed;
212 }
213
214 for (i = 0; i < count; i++) {
215 rc = hpyfs_vm_create_guest(sb, dir, &(data[i]));
216 if (rc)
217 goto failed;
218 }
219 diag2fc_free(data);
220 return 0;
221
222failed:
223 diag2fc_free(data);
224 return rc;
225}
226
227struct dbfs_d2fc_hdr {
228 u64 len; /* Length of d2fc buffer without header */
229 u16 version; /* Version of header */
230 char tod_ext[16]; /* TOD clock for d2fc */
231 u64 count; /* Number of VM guests in d2fc buffer */
232 char reserved[30];
233} __attribute__ ((packed));
234
235struct dbfs_d2fc {
236 struct dbfs_d2fc_hdr hdr; /* 64 byte header */
237 char buf[]; /* d2fc buffer */
238} __attribute__ ((packed));
239
240static int dbfs_diag2fc_create(void **data, void **data_free_ptr, size_t *size)
241{
242 struct dbfs_d2fc *d2fc;
243 unsigned int count;
244
245 d2fc = diag2fc_store(guest_query, &count, sizeof(d2fc->hdr));
246 if (IS_ERR(d2fc))
247 return PTR_ERR(d2fc);
248 get_clock_ext(d2fc->hdr.tod_ext);
249 d2fc->hdr.len = count * sizeof(struct diag2fc_data);
250 d2fc->hdr.version = DBFS_D2FC_HDR_VERSION;
251 d2fc->hdr.count = count;
252 memset(&d2fc->hdr.reserved, 0, sizeof(d2fc->hdr.reserved));
253 *data = d2fc;
254 *data_free_ptr = d2fc;
255 *size = d2fc->hdr.len + sizeof(struct dbfs_d2fc_hdr);
256 return 0;
257}
258
259static struct hypfs_dbfs_file dbfs_file_2fc = {
260 .name = "diag_2fc",
261 .data_create = dbfs_diag2fc_create,
262 .data_free = diag2fc_free,
263};
264
265int hypfs_vm_init(void)
266{
267 if (!MACHINE_IS_VM)
268 return 0;
269 if (diag2fc(0, all_guests, NULL) > 0)
270 guest_query = all_guests;
271 else if (diag2fc(0, local_guest, NULL) > 0)
272 guest_query = local_guest;
273 else
274 return -EACCES;
275 return hypfs_dbfs_create_file(&dbfs_file_2fc);
276}
277
278void hypfs_vm_exit(void)
279{
280 if (!MACHINE_IS_VM)
281 return;
282 hypfs_dbfs_remove_file(&dbfs_file_2fc);
283}