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/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 ocpus;
  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(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         /*
 146          * Note: The "weight_min" attribute got the wrong name.
 147          * The value represents the number of non-stopped (operating)
 148          * CPUS.
 149          */
 150         ATTRIBUTE(cpus_dir, "weight_min", data->ocpus);
 151         ATTRIBUTE(cpus_dir, "weight_max", data->cpu_max);
 152         ATTRIBUTE(cpus_dir, "weight_cur", data->cpu_shares);
 153
 154         /* memory information */
 155         mem_dir = hypfs_mkdir(guest_dir, "mem");
 156         if (IS_ERR(mem_dir))
 157                 return PTR_ERR(mem_dir);
 158         ATTRIBUTE(mem_dir, "min_KiB", data->mem_min_kb);
 159         ATTRIBUTE(mem_dir, "max_KiB", data->mem_max_kb);
 160         ATTRIBUTE(mem_dir, "used_KiB", data->mem_used_kb);
 161         ATTRIBUTE(mem_dir, "share_KiB", data->mem_share_kb);
 162
 163         /* samples */
 164         samples_dir = hypfs_mkdir(guest_dir, "samples");
 165         if (IS_ERR(samples_dir))
 166                 return PTR_ERR(samples_dir);
 167         ATTRIBUTE(samples_dir, "cpu_using", data->cpu_use_samp);
 168         ATTRIBUTE(samples_dir, "cpu_delay", data->cpu_delay_samp);
 169         ATTRIBUTE(samples_dir, "mem_delay", data->page_wait_samp);
 170         ATTRIBUTE(samples_dir, "idle", data->idle_samp);
 171         ATTRIBUTE(samples_dir, "other", data->other_samp);
 172         ATTRIBUTE(samples_dir, "total", data->total_samp);
 173         return 0;
 174 }
 175
 176 int hypfs_vm_create_files(struct dentry *root)
 177 {
 178         struct dentry *dir, *file;
 179         struct diag2fc_data *data;
 180         unsigned int count = 0;
 181         int rc, i;
 182
 183         data = diag2fc_store(guest_query, &count, 0);
 184         if (IS_ERR(data))
 185                 return PTR_ERR(data);
 186
 187         /* Hpervisor Info */
 188         dir = hypfs_mkdir(root, "hyp");
 189         if (IS_ERR(dir)) {
 190                 rc = PTR_ERR(dir);
 191                 goto failed;
 192         }
 193         file = hypfs_create_str(dir, "type", "z/VM Hypervisor");
 194         if (IS_ERR(file)) {
 195                 rc = PTR_ERR(file);
 196                 goto failed;
 197         }
 198
 199         /* physical cpus */
 200         dir = hypfs_mkdir(root, "cpus");
 201         if (IS_ERR(dir)) {
 202                 rc = PTR_ERR(dir);
 203                 goto failed;
 204         }
 205         file = hypfs_create_u64(dir, "count", data->lcpus);
 206         if (IS_ERR(file)) {
 207                 rc = PTR_ERR(file);
 208                 goto failed;
 209         }
 210
 211         /* guests */
 212         dir = hypfs_mkdir(root, "systems");
 213         if (IS_ERR(dir)) {
 214                 rc = PTR_ERR(dir);
 215                 goto failed;
 216         }
 217
 218         for (i = 0; i < count; i++) {
 219                 rc = hpyfs_vm_create_guest(dir, &(data[i]));
 220                 if (rc)
 221                         goto failed;
 222         }
 223         diag2fc_free(data);
 224         return 0;
 225
 226 failed:
 227         diag2fc_free(data);
 228         return rc;
 229 }
 230
 231 struct dbfs_d2fc_hdr {
 232         u64     len;            /* Length of d2fc buffer without header */
 233         u16     version;        /* Version of header */
 234         char    tod_ext[STORE_CLOCK_EXT_SIZE]; /* TOD clock for d2fc */
 235         u64     count;          /* Number of VM guests in d2fc buffer */
 236         char    reserved[30];
 237 } __attribute__ ((packed));
 238
 239 struct dbfs_d2fc {
 240         struct dbfs_d2fc_hdr    hdr;    /* 64 byte header */
 241         char                    buf[];  /* d2fc buffer */
 242 } __attribute__ ((packed));
 243
 244 static int dbfs_diag2fc_create(void **data, void **data_free_ptr, size_t *size)
 245 {
 246         struct dbfs_d2fc *d2fc;
 247         unsigned int count;
 248
 249         d2fc = diag2fc_store(guest_query, &count, sizeof(d2fc->hdr));
 250         if (IS_ERR(d2fc))
 251                 return PTR_ERR(d2fc);
 252         get_tod_clock_ext(d2fc->hdr.tod_ext);
 253         d2fc->hdr.len = count * sizeof(struct diag2fc_data);
 254         d2fc->hdr.version = DBFS_D2FC_HDR_VERSION;
 255         d2fc->hdr.count = count;
 256         memset(&d2fc->hdr.reserved, 0, sizeof(d2fc->hdr.reserved));
 257         *data = d2fc;
 258         *data_free_ptr = d2fc;
 259         *size = d2fc->hdr.len + sizeof(struct dbfs_d2fc_hdr);
 260         return 0;
 261 }
 262
 263 static struct hypfs_dbfs_file dbfs_file_2fc = {
 264         .name           = "diag_2fc",
 265         .data_create    = dbfs_diag2fc_create,
 266         .data_free      = diag2fc_free,
 267 };
 268
 269 int hypfs_vm_init(void)
 270 {
 271         if (!MACHINE_IS_VM)
 272                 return 0;
 273         if (diag2fc(0, all_guests, NULL) > 0)
 274                 guest_query = all_guests;
 275         else if (diag2fc(0, local_guest, NULL) > 0)
 276                 guest_query = local_guest;
 277         else
 278                 return -EACCES;
 279         return hypfs_dbfs_create_file(&dbfs_file_2fc);
 280 }
 281
 282 void hypfs_vm_exit(void)
 283 {
 284         if (!MACHINE_IS_VM)
 285                 return;
 286         hypfs_dbfs_remove_file(&dbfs_file_2fc);
 287 }