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Linux/arch/s390/hypfs/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 <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 
 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) : "" (&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(dir, name, member) \
111 do { \
112         void *rc; \
113         rc = hypfs_create_u64(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 dentry *systems_dir,
119                                  struct diag2fc_data *data)
120 {
121         char guest_name[NAME_LEN + 1] = {};
122         struct dentry *guest_dir, *cpus_dir, *samples_dir, *mem_dir;
123         int dedicated_flag, capped_value;
124 
125         capped_value = (data->flags & 0x00000006) >> 1;
126         dedicated_flag = (data->flags & 0x00000008) >> 3;
127 
128         /* guest dir */
129         memcpy(guest_name, data->guest_name, NAME_LEN);
130         EBCASC(guest_name, NAME_LEN);
131         strim(guest_name);
132         guest_dir = hypfs_mkdir(systems_dir, guest_name);
133         if (IS_ERR(guest_dir))
134                 return PTR_ERR(guest_dir);
135         ATTRIBUTE(guest_dir, "onlinetime_us", data->el_time);
136 
137         /* logical cpu information */
138         cpus_dir = hypfs_mkdir(guest_dir, "cpus");
139         if (IS_ERR(cpus_dir))
140                 return PTR_ERR(cpus_dir);
141         ATTRIBUTE(cpus_dir, "cputime_us", data->used_cpu);
142         ATTRIBUTE(cpus_dir, "capped", capped_value);
143         ATTRIBUTE(cpus_dir, "dedicated", dedicated_flag);
144         ATTRIBUTE(cpus_dir, "count", data->vcpus);
145         ATTRIBUTE(cpus_dir, "weight_min", data->cpu_min);
146         ATTRIBUTE(cpus_dir, "weight_max", data->cpu_max);
147         ATTRIBUTE(cpus_dir, "weight_cur", data->cpu_shares);
148 
149         /* memory information */
150         mem_dir = hypfs_mkdir(guest_dir, "mem");
151         if (IS_ERR(mem_dir))
152                 return PTR_ERR(mem_dir);
153         ATTRIBUTE(mem_dir, "min_KiB", data->mem_min_kb);
154         ATTRIBUTE(mem_dir, "max_KiB", data->mem_max_kb);
155         ATTRIBUTE(mem_dir, "used_KiB", data->mem_used_kb);
156         ATTRIBUTE(mem_dir, "share_KiB", data->mem_share_kb);
157 
158         /* samples */
159         samples_dir = hypfs_mkdir(guest_dir, "samples");
160         if (IS_ERR(samples_dir))
161                 return PTR_ERR(samples_dir);
162         ATTRIBUTE(samples_dir, "cpu_using", data->cpu_use_samp);
163         ATTRIBUTE(samples_dir, "cpu_delay", data->cpu_delay_samp);
164         ATTRIBUTE(samples_dir, "mem_delay", data->page_wait_samp);
165         ATTRIBUTE(samples_dir, "idle", data->idle_samp);
166         ATTRIBUTE(samples_dir, "other", data->other_samp);
167         ATTRIBUTE(samples_dir, "total", data->total_samp);
168         return 0;
169 }
170 
171 int hypfs_vm_create_files(struct dentry *root)
172 {
173         struct dentry *dir, *file;
174         struct diag2fc_data *data;
175         unsigned int count = 0;
176         int rc, i;
177 
178         data = diag2fc_store(guest_query, &count, 0);
179         if (IS_ERR(data))
180                 return PTR_ERR(data);
181 
182         /* Hpervisor Info */
183         dir = hypfs_mkdir(root, "hyp");
184         if (IS_ERR(dir)) {
185                 rc = PTR_ERR(dir);
186                 goto failed;
187         }
188         file = hypfs_create_str(dir, "type", "z/VM Hypervisor");
189         if (IS_ERR(file)) {
190                 rc = PTR_ERR(file);
191                 goto failed;
192         }
193 
194         /* physical cpus */
195         dir = hypfs_mkdir(root, "cpus");
196         if (IS_ERR(dir)) {
197                 rc = PTR_ERR(dir);
198                 goto failed;
199         }
200         file = hypfs_create_u64(dir, "count", data->lcpus);
201         if (IS_ERR(file)) {
202                 rc = PTR_ERR(file);
203                 goto failed;
204         }
205 
206         /* guests */
207         dir = hypfs_mkdir(root, "systems");
208         if (IS_ERR(dir)) {
209                 rc = PTR_ERR(dir);
210                 goto failed;
211         }
212 
213         for (i = 0; i < count; i++) {
214                 rc = hpyfs_vm_create_guest(dir, &(data[i]));
215                 if (rc)
216                         goto failed;
217         }
218         diag2fc_free(data);
219         return 0;
220 
221 failed:
222         diag2fc_free(data);
223         return rc;
224 }
225 
226 struct dbfs_d2fc_hdr {
227         u64     len;            /* Length of d2fc buffer without header */
228         u16     version;        /* Version of header */
229         char    tod_ext[16];    /* TOD clock for d2fc */
230         u64     count;          /* Number of VM guests in d2fc buffer */
231         char    reserved[30];
232 } __attribute__ ((packed));
233 
234 struct dbfs_d2fc {
235         struct dbfs_d2fc_hdr    hdr;    /* 64 byte header */
236         char                    buf[];  /* d2fc buffer */
237 } __attribute__ ((packed));
238 
239 static int dbfs_diag2fc_create(void **data, void **data_free_ptr, size_t *size)
240 {
241         struct dbfs_d2fc *d2fc;
242         unsigned int count;
243 
244         d2fc = diag2fc_store(guest_query, &count, sizeof(d2fc->hdr));
245         if (IS_ERR(d2fc))
246                 return PTR_ERR(d2fc);
247         get_tod_clock_ext(d2fc->hdr.tod_ext);
248         d2fc->hdr.len = count * sizeof(struct diag2fc_data);
249         d2fc->hdr.version = DBFS_D2FC_HDR_VERSION;
250         d2fc->hdr.count = count;
251         memset(&d2fc->hdr.reserved, 0, sizeof(d2fc->hdr.reserved));
252         *data = d2fc;
253         *data_free_ptr = d2fc;
254         *size = d2fc->hdr.len + sizeof(struct dbfs_d2fc_hdr);
255         return 0;
256 }
257 
258 static struct hypfs_dbfs_file dbfs_file_2fc = {
259         .name           = "diag_2fc",
260         .data_create    = dbfs_diag2fc_create,
261         .data_free      = diag2fc_free,
262 };
263 
264 int hypfs_vm_init(void)
265 {
266         if (!MACHINE_IS_VM)
267                 return 0;
268         if (diag2fc(0, all_guests, NULL) > 0)
269                 guest_query = all_guests;
270         else if (diag2fc(0, local_guest, NULL) > 0)
271                 guest_query = local_guest;
272         else
273                 return -EACCES;
274         return hypfs_dbfs_create_file(&dbfs_file_2fc);
275 }
276 
277 void hypfs_vm_exit(void)
278 {
279         if (!MACHINE_IS_VM)
280                 return;
281         hypfs_dbfs_remove_file(&dbfs_file_2fc);
282 }
283 

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