summaryrefslogtreecommitdiffstats
path: root/kernel/arch/s390/hypfs/hypfs_vm.c
blob: 44feac38ccfc26dacaf57fae0463922bdafb10dd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
/*
 *    Hypervisor filesystem for Linux on s390. z/VM implementation.
 *
 *    Copyright 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/diag.h>
#include <asm/ebcdic.h>
#include <asm/timex.h>
#include "hypfs.h"

#define NAME_LEN 8
#define DBFS_D2FC_HDR_VERSION 0

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 ocpus;
	__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;

	diag_stat_inc(DIAG_STAT_X2FC);
	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;
}

/*
 * Allocate buffer for "query" and store diag 2fc at "offset"
 */
static void *diag2fc_store(char *query, unsigned int *count, int offset)
{
	void *data;
	int size;

	do {
		size = diag2fc(0, query, NULL);
		if (size < 0)
			return ERR_PTR(-EACCES);
		data = vmalloc(size + offset);
		if (!data)
			return ERR_PTR(-ENOMEM);
		if (diag2fc(size, query, data + offset) == 0)
			break;
		vfree(data);
	} while (1);
	*count = (size / sizeof(struct diag2fc_data));

	return data;
}

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

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

static int hpyfs_vm_create_guest(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);
	strim(guest_name);
	guest_dir = hypfs_mkdir(systems_dir, guest_name);
	if (IS_ERR(guest_dir))
		return PTR_ERR(guest_dir);
	ATTRIBUTE(guest_dir, "onlinetime_us", data->el_time);

	/* logical cpu information */
	cpus_dir = hypfs_mkdir(guest_dir, "cpus");
	if (IS_ERR(cpus_dir))
		return PTR_ERR(cpus_dir);
	ATTRIBUTE(cpus_dir, "cputime_us", data->used_cpu);
	ATTRIBUTE(cpus_dir, "capped", capped_value);
	ATTRIBUTE(cpus_dir, "dedicated", dedicated_flag);
	ATTRIBUTE(cpus_dir, "count", data->vcpus);
	/*
	 * Note: The "weight_min" attribute got the wrong name.
	 * The value represents the number of non-stopped (operating)
	 * CPUS.
	 */
	ATTRIBUTE(cpus_dir, "weight_min", data->ocpus);
	ATTRIBUTE(cpus_dir, "weight_max", data->cpu_max);
	ATTRIBUTE(cpus_dir, "weight_cur", data->cpu_shares);

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

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

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

	data = diag2fc_store(guest_query, &count, 0);
	if (IS_ERR(data))
		return PTR_ERR(data);

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

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

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

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

failed:
	diag2fc_free(data);
	return rc;
}

struct dbfs_d2fc_hdr {
	u64	len;		/* Length of d2fc buffer without header */
	u16	version;	/* Version of header */
	char	tod_ext[STORE_CLOCK_EXT_SIZE]; /* TOD clock for d2fc */
	u64	count;		/* Number of VM guests in d2fc buffer */
	char	reserved[30];
} __attribute__ ((packed));

struct dbfs_d2fc {
	struct dbfs_d2fc_hdr	hdr;	/* 64 byte header */
	char			buf[];	/* d2fc buffer */
} __attribute__ ((packed));

static int dbfs_diag2fc_create(void **data, void **data_free_ptr, size_t *size)
{
	struct dbfs_d2fc *d2fc;
	unsigned int count;

	d2fc = diag2fc_store(guest_query, &count, sizeof(d2fc->hdr));
	if (IS_ERR(d2fc))
		return PTR_ERR(d2fc);
	get_tod_clock_ext(d2fc->hdr.tod_ext);
	d2fc->hdr.len = count * sizeof(struct diag2fc_data);
	d2fc->hdr.version = DBFS_D2FC_HDR_VERSION;
	d2fc->hdr.count = count;
	memset(&d2fc->hdr.reserved, 0, sizeof(d2fc->hdr.reserved));
	*data = d2fc;
	*data_free_ptr = d2fc;
	*size = d2fc->hdr.len + sizeof(struct dbfs_d2fc_hdr);
	return 0;
}

static struct hypfs_dbfs_file dbfs_file_2fc = {
	.name		= "diag_2fc",
	.data_create	= dbfs_diag2fc_create,
	.data_free	= diag2fc_free,
};

int hypfs_vm_init(void)
{
	if (!MACHINE_IS_VM)
		return 0;
	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 hypfs_dbfs_create_file(&dbfs_file_2fc);
}

void hypfs_vm_exit(void)
{
	if (!MACHINE_IS_VM)
		return;
	hypfs_dbfs_remove_file(&dbfs_file_2fc);
}