arch/s390/hypfs/hypfs_vm_fs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *    Hypervisor filesystem for Linux on s390. z/VM implementation.
   4  *
   5  *    Copyright IBM Corp. 2006
   6  *    Author(s): Michael Holzheu <holzheu@de.ibm.com>
   7  */
   8
   9 #include <linux/types.h>
  10 #include <linux/errno.h>
  11 #include <linux/string.h>
  12 #include <linux/vmalloc.h>
  13 #include <asm/extable.h>
  14 #include <asm/diag.h>
  15 #include <asm/ebcdic.h>
  16 #include <asm/timex.h>
  17 #include "hypfs_vm.h"
  18 #include "hypfs.h"
  19
  20 #define ATTRIBUTE(dir, name, member) \
  21 do { \
  22         void *rc; \
  23         rc = hypfs_create_u64(dir, name, member); \
  24         if (IS_ERR(rc)) \
  25                 return PTR_ERR(rc); \
  26 } while (0)
  27
  28 static int hypfs_vm_create_guest(struct dentry *systems_dir,
  29                                  struct diag2fc_data *data)
  30 {
  31         char guest_name[DIAG2FC_NAME_LEN + 1] = {};
  32         struct dentry *guest_dir, *cpus_dir, *samples_dir, *mem_dir;
  33         int dedicated_flag, capped_value;
  34
  35         capped_value = (data->flags & 0x00000006) >> 1;
  36         dedicated_flag = (data->flags & 0x00000008) >> 3;
  37
  38         /* guest dir */
  39         memcpy(guest_name, data->guest_name, DIAG2FC_NAME_LEN);
  40         EBCASC(guest_name, DIAG2FC_NAME_LEN);
  41         strim(guest_name);
  42         guest_dir = hypfs_mkdir(systems_dir, guest_name);
  43         if (IS_ERR(guest_dir))
  44                 return PTR_ERR(guest_dir);
  45         ATTRIBUTE(guest_dir, "onlinetime_us", data->el_time);
  46
  47         /* logical cpu information */
  48         cpus_dir = hypfs_mkdir(guest_dir, "cpus");
  49         if (IS_ERR(cpus_dir))
  50                 return PTR_ERR(cpus_dir);
  51         ATTRIBUTE(cpus_dir, "cputime_us", data->used_cpu);
  52         ATTRIBUTE(cpus_dir, "capped", capped_value);
  53         ATTRIBUTE(cpus_dir, "dedicated", dedicated_flag);
  54         ATTRIBUTE(cpus_dir, "count", data->vcpus);
  55         /*
  56          * Note: The "weight_min" attribute got the wrong name.
  57          * The value represents the number of non-stopped (operating)
  58          * CPUS.
  59          */
  60         ATTRIBUTE(cpus_dir, "weight_min", data->ocpus);
  61         ATTRIBUTE(cpus_dir, "weight_max", data->cpu_max);
  62         ATTRIBUTE(cpus_dir, "weight_cur", data->cpu_shares);
  63
  64         /* memory information */
  65         mem_dir = hypfs_mkdir(guest_dir, "mem");
  66         if (IS_ERR(mem_dir))
  67                 return PTR_ERR(mem_dir);
  68         ATTRIBUTE(mem_dir, "min_KiB", data->mem_min_kb);
  69         ATTRIBUTE(mem_dir, "max_KiB", data->mem_max_kb);
  70         ATTRIBUTE(mem_dir, "used_KiB", data->mem_used_kb);
  71         ATTRIBUTE(mem_dir, "share_KiB", data->mem_share_kb);
  72
  73         /* samples */
  74         samples_dir = hypfs_mkdir(guest_dir, "samples");
  75         if (IS_ERR(samples_dir))
  76                 return PTR_ERR(samples_dir);
  77         ATTRIBUTE(samples_dir, "cpu_using", data->cpu_use_samp);
  78         ATTRIBUTE(samples_dir, "cpu_delay", data->cpu_delay_samp);
  79         ATTRIBUTE(samples_dir, "mem_delay", data->page_wait_samp);
  80         ATTRIBUTE(samples_dir, "idle", data->idle_samp);
  81         ATTRIBUTE(samples_dir, "other", data->other_samp);
  82         ATTRIBUTE(samples_dir, "total", data->total_samp);
  83         return 0;
  84 }
  85
  86 int hypfs_vm_create_files(struct dentry *root)
  87 {
  88         struct dentry *dir, *file;
  89         struct diag2fc_data *data;
  90         unsigned int count = 0;
  91         int rc, i;
  92
  93         data = diag2fc_store(diag2fc_guest_query, &count, 0);
  94         if (IS_ERR(data))
  95                 return PTR_ERR(data);
  96
  97         /* Hypervisor Info */
  98         dir = hypfs_mkdir(root, "hyp");
  99         if (IS_ERR(dir)) {
 100                 rc = PTR_ERR(dir);
 101                 goto failed;
 102         }
 103         file = hypfs_create_str(dir, "type", "z/VM Hypervisor");
 104         if (IS_ERR(file)) {
 105                 rc = PTR_ERR(file);
 106                 goto failed;
 107         }
 108
 109         /* physical cpus */
 110         dir = hypfs_mkdir(root, "cpus");
 111         if (IS_ERR(dir)) {
 112                 rc = PTR_ERR(dir);
 113                 goto failed;
 114         }
 115         file = hypfs_create_u64(dir, "count", data->lcpus);
 116         if (IS_ERR(file)) {
 117                 rc = PTR_ERR(file);
 118                 goto failed;
 119         }
 120
 121         /* guests */
 122         dir = hypfs_mkdir(root, "systems");
 123         if (IS_ERR(dir)) {
 124                 rc = PTR_ERR(dir);
 125                 goto failed;
 126         }
 127
 128         for (i = 0; i < count; i++) {
 129                 rc = hypfs_vm_create_guest(dir, &data[i]);
 130                 if (rc)
 131                         goto failed;
 132         }
 133         diag2fc_free(data);
 134         return 0;
 135
 136 failed:
 137         diag2fc_free(data);
 138         return rc;
 139 }