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hypfs_vm.c
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1 /*
2  * Hypervisor filesystem for Linux on s390. z/VM implementation.
3  *
4  * Copyright IBM Corp. 2006
5  * Author(s): Michael Holzheu <[email protected]>
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 
19 static char local_guest[] = " ";
20 static char all_guests[] = "* ";
21 static char *guest_query;
22 
23 struct 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 
47 struct 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 
55 static 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  */
84 static 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 
105 static void diag2fc_free(const void *data)
106 {
107  vfree(data);
108 }
109 
110 #define ATTRIBUTE(sb, dir, name, member) \
111 do { \
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 
118 static 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 
172 int 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 
222 failed:
223  diag2fc_free(data);
224  return rc;
225 }
226 
227 struct 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 
235 struct dbfs_d2fc {
236  struct dbfs_d2fc_hdr hdr; /* 64 byte header */
237  char buf[]; /* d2fc buffer */
238 } __attribute__ ((packed));
239 
240 static 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 
259 static struct hypfs_dbfs_file dbfs_file_2fc = {
260  .name = "diag_2fc",
261  .data_create = dbfs_diag2fc_create,
262  .data_free = diag2fc_free,
263 };
264 
265 int 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 
278 void hypfs_vm_exit(void)
279 {
280  if (!MACHINE_IS_VM)
281  return;
282  hypfs_dbfs_remove_file(&dbfs_file_2fc);
283 }
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