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) \
21do { \
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
28static 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
86int 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
136failed:
137	diag2fc_free(data);
138	return rc;
139}
140