arch/s390/hypfs/hypfs_vm.c

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