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 }
140
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