arch/s390/hypfs/hypfs_vm.c

   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 "hypfs.h"
  14
  15 #define NAME_LEN 8
  16
  17 static char local_guest[] = "        ";
  18 static char all_guests[] = "*       ";
  19 static char *guest_query;
  20
  21 struct diag2fc_data {
  22         __u32 version;
  23         __u32 flags;
  24         __u64 used_cpu;
  25         __u64 el_time;
  26         __u64 mem_min_kb;
  27         __u64 mem_max_kb;
  28         __u64 mem_share_kb;
  29         __u64 mem_used_kb;
  30         __u32 pcpus;
  31         __u32 lcpus;
  32         __u32 vcpus;
  33         __u32 cpu_min;
  34         __u32 cpu_max;
  35         __u32 cpu_shares;
  36         __u32 cpu_use_samp;
  37         __u32 cpu_delay_samp;
  38         __u32 page_wait_samp;
  39         __u32 idle_samp;
  40         __u32 other_samp;
  41         __u32 total_samp;
  42         char  guest_name[NAME_LEN];
  43 };
  44
  45 struct diag2fc_parm_list {
  46         char userid[NAME_LEN];
  47         char aci_grp[NAME_LEN];
  48         __u64 addr;
  49         __u32 size;
  50         __u32 fmt;
  51 };
  52
  53 static int diag2fc(int size, char* query, void *addr)
  54 {
  55         unsigned long residual_cnt;
  56         unsigned long rc;
  57         struct diag2fc_parm_list parm_list;
  58
  59         memcpy(parm_list.userid, query, NAME_LEN);
  60         ASCEBC(parm_list.userid, NAME_LEN);
  61         parm_list.addr = (unsigned long) addr ;
  62         parm_list.size = size;
  63         parm_list.fmt = 0x02;
  64         memset(parm_list.aci_grp, 0x40, NAME_LEN);
  65         rc = -1;
  66
  67         asm volatile(
  68                 "       diag    %0,%1,0x2fc\n"
  69                 "0:\n"
  70                 EX_TABLE(0b,0b)
  71                 : "=d" (residual_cnt), "+d" (rc) : "0" (&parm_list) : "memory");
  72
  73         if ((rc != 0 ) && (rc != -2))
  74                 return rc;
  75         else
  76                 return -residual_cnt;
  77 }
  78
  79 static struct diag2fc_data *diag2fc_store(char *query, int *count)
  80 {
  81         int size;
  82         struct diag2fc_data *data;
  83
  84         do {
  85                 size = diag2fc(0, query, NULL);
  86                 if (size < 0)
  87                         return ERR_PTR(-EACCES);
  88                 data = vmalloc(size);
  89                 if (!data)
  90                         return ERR_PTR(-ENOMEM);
  91                 if (diag2fc(size, query, data) == 0)
  92                         break;
  93                 vfree(data);
  94         } while (1);
  95         *count = (size / sizeof(*data));
  96
  97         return data;
  98 }
  99
 100 static void diag2fc_free(void *data)
 101 {
 102         vfree(data);
 103 }
 104
 105 #define ATTRIBUTE(sb, dir, name, member) \
 106 do { \
 107         void *rc; \
 108         rc = hypfs_create_u64(sb, dir, name, member); \
 109         if (IS_ERR(rc)) \
 110                 return PTR_ERR(rc); \
 111 } while(0)
 112
 113 static int hpyfs_vm_create_guest(struct super_block *sb,
 114                                  struct dentry *systems_dir,
 115                                  struct diag2fc_data *data)
 116 {
 117         char guest_name[NAME_LEN + 1] = {};
 118         struct dentry *guest_dir, *cpus_dir, *samples_dir, *mem_dir;
 119         int dedicated_flag, capped_value;
 120
 121         capped_value = (data->flags & 0x00000006) >> 1;
 122         dedicated_flag = (data->flags & 0x00000008) >> 3;
 123
 124         /* guest dir */
 125         memcpy(guest_name, data->guest_name, NAME_LEN);
 126         EBCASC(guest_name, NAME_LEN);
 127         strstrip(guest_name);
 128         guest_dir = hypfs_mkdir(sb, systems_dir, guest_name);
 129         if (IS_ERR(guest_dir))
 130                 return PTR_ERR(guest_dir);
 131         ATTRIBUTE(sb, guest_dir, "onlinetime_us", data->el_time);
 132
 133         /* logical cpu information */
 134         cpus_dir = hypfs_mkdir(sb, guest_dir, "cpus");
 135         if (IS_ERR(cpus_dir))
 136                 return PTR_ERR(cpus_dir);
 137         ATTRIBUTE(sb, cpus_dir, "cputime_us", data->used_cpu);
 138         ATTRIBUTE(sb, cpus_dir, "capped", capped_value);
 139         ATTRIBUTE(sb, cpus_dir, "dedicated", dedicated_flag);
 140         ATTRIBUTE(sb, cpus_dir, "count", data->vcpus);
 141         ATTRIBUTE(sb, cpus_dir, "weight_min", data->cpu_min);
 142         ATTRIBUTE(sb, cpus_dir, "weight_max", data->cpu_max);
 143         ATTRIBUTE(sb, cpus_dir, "weight_cur", data->cpu_shares);
 144
 145         /* memory information */
 146         mem_dir = hypfs_mkdir(sb, guest_dir, "mem");
 147         if (IS_ERR(mem_dir))
 148                 return PTR_ERR(mem_dir);
 149         ATTRIBUTE(sb, mem_dir, "min_KiB", data->mem_min_kb);
 150         ATTRIBUTE(sb, mem_dir, "max_KiB", data->mem_max_kb);
 151         ATTRIBUTE(sb, mem_dir, "used_KiB", data->mem_used_kb);
 152         ATTRIBUTE(sb, mem_dir, "share_KiB", data->mem_share_kb);
 153
 154         /* samples */
 155         samples_dir = hypfs_mkdir(sb, guest_dir, "samples");
 156         if (IS_ERR(samples_dir))
 157                 return PTR_ERR(samples_dir);
 158         ATTRIBUTE(sb, samples_dir, "cpu_using", data->cpu_use_samp);
 159         ATTRIBUTE(sb, samples_dir, "cpu_delay", data->cpu_delay_samp);
 160         ATTRIBUTE(sb, samples_dir, "mem_delay", data->page_wait_samp);
 161         ATTRIBUTE(sb, samples_dir, "idle", data->idle_samp);
 162         ATTRIBUTE(sb, samples_dir, "other", data->other_samp);
 163         ATTRIBUTE(sb, samples_dir, "total", data->total_samp);
 164         return 0;
 165 }
 166
 167 int hypfs_vm_create_files(struct super_block *sb, struct dentry *root)
 168 {
 169         struct dentry *dir, *file;
 170         struct diag2fc_data *data;
 171         int rc, i, count = 0;
 172
 173         data = diag2fc_store(guest_query, &count);
 174         if (IS_ERR(data))
 175                 return PTR_ERR(data);
 176
 177         /* Hpervisor Info */
 178         dir = hypfs_mkdir(sb, root, "hyp");
 179         if (IS_ERR(dir)) {
 180                 rc = PTR_ERR(dir);
 181                 goto failed;
 182         }
 183         file = hypfs_create_str(sb, dir, "type", "z/VM Hypervisor");
 184         if (IS_ERR(file)) {
 185                 rc = PTR_ERR(file);
 186                 goto failed;
 187         }
 188
 189         /* physical cpus */
 190         dir = hypfs_mkdir(sb, root, "cpus");
 191         if (IS_ERR(dir)) {
 192                 rc = PTR_ERR(dir);
 193                 goto failed;
 194         }
 195         file = hypfs_create_u64(sb, dir, "count", data->lcpus);
 196         if (IS_ERR(file)) {
 197                 rc = PTR_ERR(file);
 198                 goto failed;
 199         }
 200
 201         /* guests */
 202         dir = hypfs_mkdir(sb, root, "systems");
 203         if (IS_ERR(dir)) {
 204                 rc = PTR_ERR(dir);
 205                 goto failed;
 206         }
 207
 208         for (i = 0; i < count; i++) {
 209                 rc = hpyfs_vm_create_guest(sb, dir, &(data[i]));
 210                 if (rc)
 211                         goto failed;
 212         }
 213         diag2fc_free(data);
 214         return 0;
 215
 216 failed:
 217         diag2fc_free(data);
 218         return rc;
 219 }
 220
 221 int hypfs_vm_init(void)
 222 {
 223         if (diag2fc(0, all_guests, NULL) > 0)
 224                 guest_query = all_guests;
 225         else if (diag2fc(0, local_guest, NULL) > 0)
 226                 guest_query = local_guest;
 227         else
 228                 return -EACCES;
 229
 230         return 0;
 231 }