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 int rc = hypfs_create_u64(dir, name, member); \
23 if (rc) \
24 return rc; \
25 } while (0)
26
hypfs_vm_create_guest(struct dentry * systems_dir,struct diag2fc_data * data)27 static int hypfs_vm_create_guest(struct dentry *systems_dir,
28 struct diag2fc_data *data)
29 {
30 char guest_name[DIAG2FC_NAME_LEN + 1] = {};
31 struct dentry *guest_dir, *cpus_dir, *samples_dir, *mem_dir;
32 int dedicated_flag, capped_value;
33
34 capped_value = (data->flags & 0x00000006) >> 1;
35 dedicated_flag = (data->flags & 0x00000008) >> 3;
36
37 /* guest dir */
38 memcpy(guest_name, data->guest_name, DIAG2FC_NAME_LEN);
39 EBCASC(guest_name, DIAG2FC_NAME_LEN);
40 strim(guest_name);
41 guest_dir = hypfs_mkdir(systems_dir, guest_name);
42 if (IS_ERR(guest_dir))
43 return PTR_ERR(guest_dir);
44 ATTRIBUTE(guest_dir, "onlinetime_us", data->el_time);
45
46 /* logical cpu information */
47 cpus_dir = hypfs_mkdir(guest_dir, "cpus");
48 if (IS_ERR(cpus_dir))
49 return PTR_ERR(cpus_dir);
50 ATTRIBUTE(cpus_dir, "cputime_us", data->used_cpu);
51 ATTRIBUTE(cpus_dir, "capped", capped_value);
52 ATTRIBUTE(cpus_dir, "dedicated", dedicated_flag);
53 ATTRIBUTE(cpus_dir, "count", data->vcpus);
54 /*
55 * Note: The "weight_min" attribute got the wrong name.
56 * The value represents the number of non-stopped (operating)
57 * CPUS.
58 */
59 ATTRIBUTE(cpus_dir, "weight_min", data->ocpus);
60 ATTRIBUTE(cpus_dir, "weight_max", data->cpu_max);
61 ATTRIBUTE(cpus_dir, "weight_cur", data->cpu_shares);
62
63 /* memory information */
64 mem_dir = hypfs_mkdir(guest_dir, "mem");
65 if (IS_ERR(mem_dir))
66 return PTR_ERR(mem_dir);
67 ATTRIBUTE(mem_dir, "min_KiB", data->mem_min_kb);
68 ATTRIBUTE(mem_dir, "max_KiB", data->mem_max_kb);
69 ATTRIBUTE(mem_dir, "used_KiB", data->mem_used_kb);
70 ATTRIBUTE(mem_dir, "share_KiB", data->mem_share_kb);
71
72 /* samples */
73 samples_dir = hypfs_mkdir(guest_dir, "samples");
74 if (IS_ERR(samples_dir))
75 return PTR_ERR(samples_dir);
76 ATTRIBUTE(samples_dir, "cpu_using", data->cpu_use_samp);
77 ATTRIBUTE(samples_dir, "cpu_delay", data->cpu_delay_samp);
78 ATTRIBUTE(samples_dir, "mem_delay", data->page_wait_samp);
79 ATTRIBUTE(samples_dir, "idle", data->idle_samp);
80 ATTRIBUTE(samples_dir, "other", data->other_samp);
81 ATTRIBUTE(samples_dir, "total", data->total_samp);
82 return 0;
83 }
84
hypfs_vm_create_files(struct dentry * root)85 int hypfs_vm_create_files(struct dentry *root)
86 {
87 struct dentry *dir;
88 struct diag2fc_data *data;
89 unsigned int count = 0;
90 int rc, i;
91
92 data = diag2fc_store(diag2fc_guest_query, &count, 0);
93 if (IS_ERR(data))
94 return PTR_ERR(data);
95
96 /* Hypervisor Info */
97 dir = hypfs_mkdir(root, "hyp");
98 if (IS_ERR(dir)) {
99 rc = PTR_ERR(dir);
100 goto failed;
101 }
102 rc = hypfs_create_str(dir, "type", "z/VM Hypervisor");
103 if (rc)
104 goto failed;
105
106 /* physical cpus */
107 dir = hypfs_mkdir(root, "cpus");
108 if (IS_ERR(dir)) {
109 rc = PTR_ERR(dir);
110 goto failed;
111 }
112 rc = hypfs_create_u64(dir, "count", data->lcpus);
113 if (rc)
114 goto failed;
115
116 /* guests */
117 dir = hypfs_mkdir(root, "systems");
118 if (IS_ERR(dir)) {
119 rc = PTR_ERR(dir);
120 goto failed;
121 }
122
123 for (i = 0; i < count; i++) {
124 rc = hypfs_vm_create_guest(dir, &data[i]);
125 if (rc)
126 goto failed;
127 }
128 diag2fc_free(data);
129 return 0;
130
131 failed:
132 diag2fc_free(data);
133 return rc;
134 }
135