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hypfs_vm.c

/*
 *    Hypervisor filesystem for Linux on s390. z/VM implementation.
 *
 *    Copyright (C) IBM Corp. 2006
 *    Author(s): Michael Holzheu <holzheu@de.ibm.com>
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/vmalloc.h>
#include <asm/ebcdic.h>
#include "hypfs.h"

#define NAME_LEN 8

static char local_guest[] = "        ";
static char all_guests[] = "*       ";
static char *guest_query;

struct diag2fc_data {
      __u32 version;
      __u32 flags;
      __u64 used_cpu;
      __u64 el_time;
      __u64 mem_min_kb;
      __u64 mem_max_kb;
      __u64 mem_share_kb;
      __u64 mem_used_kb;
      __u32 pcpus;
      __u32 lcpus;
      __u32 vcpus;
      __u32 cpu_min;
      __u32 cpu_max;
      __u32 cpu_shares;
      __u32 cpu_use_samp;
      __u32 cpu_delay_samp;
      __u32 page_wait_samp;
      __u32 idle_samp;
      __u32 other_samp;
      __u32 total_samp;
      char  guest_name[NAME_LEN];
};

struct diag2fc_parm_list {
      char userid[NAME_LEN];
      char aci_grp[NAME_LEN];
      __u64 addr;
      __u32 size;
      __u32 fmt;
};

static int diag2fc(int size, char* query, void *addr)
{
      unsigned long residual_cnt;
      unsigned long rc;
      struct diag2fc_parm_list parm_list;

      memcpy(parm_list.userid, query, NAME_LEN);
      ASCEBC(parm_list.userid, NAME_LEN);
      parm_list.addr = (unsigned long) addr ;
      parm_list.size = size;
      parm_list.fmt = 0x02;
      memset(parm_list.aci_grp, 0x40, NAME_LEN);
      rc = -1;

      asm volatile(
            "     diag    %0,%1,0x2fc\n"
            "0:\n"
            EX_TABLE(0b,0b)
            : "=d" (residual_cnt), "+d" (rc) : "0" (&parm_list) : "memory");

      if ((rc != 0 ) && (rc != -2))
            return rc;
      else
            return -residual_cnt;
}

static struct diag2fc_data *diag2fc_store(char *query, int *count)
{
      int size;
      struct diag2fc_data *data;

      do {
            size = diag2fc(0, query, NULL);
            if (size < 0)
                  return ERR_PTR(-EACCES);
            data = vmalloc(size);
            if (!data)
                  return ERR_PTR(-ENOMEM);
            if (diag2fc(size, query, data) == 0)
                  break;
            vfree(data);
      } while (1);
      *count = (size / sizeof(*data));

      return data;
}

static void diag2fc_free(void *data)
{
      vfree(data);
}

#define ATTRIBUTE(sb, dir, name, member) \
do { \
      void *rc; \
      rc = hypfs_create_u64(sb, dir, name, member); \
      if (IS_ERR(rc)) \
            return PTR_ERR(rc); \
} while(0)

static int hpyfs_vm_create_guest(struct super_block *sb,
                         struct dentry *systems_dir,
                         struct diag2fc_data *data)
{
      char guest_name[NAME_LEN + 1] = {};
      struct dentry *guest_dir, *cpus_dir, *samples_dir, *mem_dir;
      int dedicated_flag, capped_value;

      capped_value = (data->flags & 0x00000006) >> 1;
      dedicated_flag = (data->flags & 0x00000008) >> 3;

      /* guest dir */
      memcpy(guest_name, data->guest_name, NAME_LEN);
      EBCASC(guest_name, NAME_LEN);
      strstrip(guest_name);
      guest_dir = hypfs_mkdir(sb, systems_dir, guest_name);
      if (IS_ERR(guest_dir))
            return PTR_ERR(guest_dir);
      ATTRIBUTE(sb, guest_dir, "onlinetime_us", data->el_time);

      /* logical cpu information */
      cpus_dir = hypfs_mkdir(sb, guest_dir, "cpus");
      if (IS_ERR(cpus_dir))
            return PTR_ERR(cpus_dir);
      ATTRIBUTE(sb, cpus_dir, "cputime_us", data->used_cpu);
      ATTRIBUTE(sb, cpus_dir, "capped", capped_value);
      ATTRIBUTE(sb, cpus_dir, "dedicated", dedicated_flag);
      ATTRIBUTE(sb, cpus_dir, "count", data->vcpus);
      ATTRIBUTE(sb, cpus_dir, "weight_min", data->cpu_min);
      ATTRIBUTE(sb, cpus_dir, "weight_max", data->cpu_max);
      ATTRIBUTE(sb, cpus_dir, "weight_cur", data->cpu_shares);

      /* memory information */
      mem_dir = hypfs_mkdir(sb, guest_dir, "mem");
      if (IS_ERR(mem_dir))
            return PTR_ERR(mem_dir);
      ATTRIBUTE(sb, mem_dir, "min_KiB", data->mem_min_kb);
      ATTRIBUTE(sb, mem_dir, "max_KiB", data->mem_max_kb);
      ATTRIBUTE(sb, mem_dir, "used_KiB", data->mem_used_kb);
      ATTRIBUTE(sb, mem_dir, "share_KiB", data->mem_share_kb);

      /* samples */
      samples_dir = hypfs_mkdir(sb, guest_dir, "samples");
      if (IS_ERR(samples_dir))
            return PTR_ERR(samples_dir);
      ATTRIBUTE(sb, samples_dir, "cpu_using", data->cpu_use_samp);
      ATTRIBUTE(sb, samples_dir, "cpu_delay", data->cpu_delay_samp);
      ATTRIBUTE(sb, samples_dir, "mem_delay", data->page_wait_samp);
      ATTRIBUTE(sb, samples_dir, "idle", data->idle_samp);
      ATTRIBUTE(sb, samples_dir, "other", data->other_samp);
      ATTRIBUTE(sb, samples_dir, "total", data->total_samp);
      return 0;
}

int hypfs_vm_create_files(struct super_block *sb, struct dentry *root)
{
      struct dentry *dir, *file;
      struct diag2fc_data *data;
      int rc, i, count = 0;

      data = diag2fc_store(guest_query, &count);
      if (IS_ERR(data))
            return PTR_ERR(data);

      /* Hpervisor Info */
      dir = hypfs_mkdir(sb, root, "hyp");
      if (IS_ERR(dir)) {
            rc = PTR_ERR(dir);
            goto failed;
      }
      file = hypfs_create_str(sb, dir, "type", "z/VM Hypervisor");
      if (IS_ERR(file)) {
            rc = PTR_ERR(file);
            goto failed;
      }

      /* physical cpus */
      dir = hypfs_mkdir(sb, root, "cpus");
      if (IS_ERR(dir)) {
            rc = PTR_ERR(dir);
            goto failed;
      }
      file = hypfs_create_u64(sb, dir, "count", data->lcpus);
      if (IS_ERR(file)) {
            rc = PTR_ERR(file);
            goto failed;
      }

      /* guests */
      dir = hypfs_mkdir(sb, root, "systems");
      if (IS_ERR(dir)) {
            rc = PTR_ERR(dir);
            goto failed;
      }

      for (i = 0; i < count; i++) {
            rc = hpyfs_vm_create_guest(sb, dir, &(data[i]));
            if (rc)
                  goto failed;
      }
      diag2fc_free(data);
      return 0;

failed:
      diag2fc_free(data);
      return rc;
}

int hypfs_vm_init(void)
{
      if (diag2fc(0, all_guests, NULL) > 0)
            guest_query = all_guests;
      else if (diag2fc(0, local_guest, NULL) > 0)
            guest_query = local_guest;
      else
            return -EACCES;

      return 0;
}

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