summaryrefslogtreecommitdiff
path: root/drivers/s390/char/sclp_early.c
blob: e0a1f4eec370a9db7a0b7d4c64b11a6ec3ab8ac8 (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
/*
 * SCLP early driver
 *
 * Copyright IBM Corp. 2013
 */

#define KMSG_COMPONENT "sclp_early"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/errno.h>
#include <asm/ctl_reg.h>
#include <asm/sclp.h>
#include <asm/ipl.h>
#include "sclp_sdias.h"
#include "sclp.h"

#define SCLP_CMDW_READ_SCP_INFO		0x00020001
#define SCLP_CMDW_READ_SCP_INFO_FORCED	0x00120001

struct read_info_sccb {
	struct	sccb_header header;	/* 0-7 */
	u16	rnmax;			/* 8-9 */
	u8	rnsize;			/* 10 */
	u8	_pad_11[16 - 11];	/* 11-15 */
	u16	ncpurl;			/* 16-17 */
	u16	cpuoff;			/* 18-19 */
	u8	_pad_20[24 - 20];	/* 20-23 */
	u8	loadparm[8];		/* 24-31 */
	u8	_pad_32[42 - 32];	/* 32-41 */
	u8	fac42;			/* 42 */
	u8	fac43;			/* 43 */
	u8	_pad_44[48 - 44];	/* 44-47 */
	u64	facilities;		/* 48-55 */
	u8	_pad_56[66 - 56];	/* 56-65 */
	u8	fac66;			/* 66 */
	u8	_pad_67[76 - 67];	/* 67-83 */
	u32	ibc;			/* 76-79 */
	u8	_pad80[84 - 80];	/* 80-83 */
	u8	fac84;			/* 84 */
	u8	fac85;			/* 85 */
	u8	_pad_86[91 - 86];	/* 86-90 */
	u8	flags;			/* 91 */
	u8	_pad_92[100 - 92];	/* 92-99 */
	u32	rnsize2;		/* 100-103 */
	u64	rnmax2;			/* 104-111 */
	u8	_pad_112[116 - 112];	/* 112-115 */
	u8	fac116;			/* 116 */
	u8	_pad_117[119 - 117];	/* 117-118 */
	u8	fac119;			/* 119 */
	u16	hcpua;			/* 120-121 */
	u8	_pad_122[4096 - 122];	/* 122-4095 */
} __packed __aligned(PAGE_SIZE);

static char sccb_early[PAGE_SIZE] __aligned(PAGE_SIZE) __initdata;
static struct sclp_ipl_info sclp_ipl_info;

struct sclp_info sclp;
EXPORT_SYMBOL(sclp);

static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
{
	int rc;

	__ctl_set_bit(0, 9);
	rc = sclp_service_call(cmd, sccb);
	if (rc)
		goto out;
	__load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA |
			PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT);
	local_irq_disable();
out:
	/* Contents of the sccb might have changed. */
	barrier();
	__ctl_clear_bit(0, 9);
	return rc;
}

static int __init sclp_read_info_early(struct read_info_sccb *sccb)
{
	int rc, i;
	sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
				  SCLP_CMDW_READ_SCP_INFO};

	for (i = 0; i < ARRAY_SIZE(commands); i++) {
		do {
			memset(sccb, 0, sizeof(*sccb));
			sccb->header.length = sizeof(*sccb);
			sccb->header.function_code = 0x80;
			sccb->header.control_mask[2] = 0x80;
			rc = sclp_cmd_sync_early(commands[i], sccb);
		} while (rc == -EBUSY);

		if (rc)
			break;
		if (sccb->header.response_code == 0x10)
			return 0;
		if (sccb->header.response_code != 0x1f0)
			break;
	}
	return -EIO;
}

static void __init sclp_facilities_detect(struct read_info_sccb *sccb)
{
	struct sclp_core_entry *cpue;
	u16 boot_cpu_address, cpu;

	if (sclp_read_info_early(sccb))
		return;

	sclp.facilities = sccb->facilities;
	sclp.has_sprp = !!(sccb->fac84 & 0x02);
	sclp.has_core_type = !!(sccb->fac84 & 0x01);
	sclp.has_esca = !!(sccb->fac116 & 0x08);
	sclp.has_hvs = !!(sccb->fac119 & 0x80);
	if (sccb->fac85 & 0x02)
		S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
	sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
	sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
	sclp.rzm <<= 20;
	sclp.ibc = sccb->ibc;

	if (!sccb->hcpua) {
		if (MACHINE_IS_VM)
			sclp.max_cores = 64;
		else
			sclp.max_cores = sccb->ncpurl;
	} else {
		sclp.max_cores = sccb->hcpua + 1;
	}

	boot_cpu_address = stap();
	cpue = (void *)sccb + sccb->cpuoff;
	for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) {
		if (boot_cpu_address != cpue->core_id)
			continue;
		sclp.has_siif = cpue->siif;
		sclp.has_sigpif = cpue->sigpif;
		sclp.has_sief2 = cpue->sief2;
		break;
	}

	/* Save IPL information */
	sclp_ipl_info.is_valid = 1;
	if (sccb->flags & 0x2)
		sclp_ipl_info.has_dump = 1;
	memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN);

	sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0;
	sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0;
	sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0;
}

/*
 * This function will be called after sclp_facilities_detect(), which gets
 * called from early.c code. The sclp_facilities_detect() function retrieves
 * and saves the IPL information.
 */
void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
{
	*info = sclp_ipl_info;
}

static int __init sclp_cmd_early(sclp_cmdw_t cmd, void *sccb)
{
	int rc;

	do {
		rc = sclp_cmd_sync_early(cmd, sccb);
	} while (rc == -EBUSY);

	if (rc)
		return -EIO;
	if (((struct sccb_header *) sccb)->response_code != 0x0020)
		return -EIO;
	return 0;
}

static void __init sccb_init_eq_size(struct sdias_sccb *sccb)
{
	memset(sccb, 0, sizeof(*sccb));

	sccb->hdr.length = sizeof(*sccb);
	sccb->evbuf.hdr.length = sizeof(struct sdias_evbuf);
	sccb->evbuf.hdr.type = EVTYP_SDIAS;
	sccb->evbuf.event_qual = SDIAS_EQ_SIZE;
	sccb->evbuf.data_id = SDIAS_DI_FCP_DUMP;
	sccb->evbuf.event_id = 4712;
	sccb->evbuf.dbs = 1;
}

static int __init sclp_set_event_mask(struct init_sccb *sccb,
				      unsigned long receive_mask,
				      unsigned long send_mask)
{
	memset(sccb, 0, sizeof(*sccb));
	sccb->header.length = sizeof(*sccb);
	sccb->mask_length = sizeof(sccb_mask_t);
	sccb->receive_mask = receive_mask;
	sccb->send_mask = send_mask;
	return sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb);
}

static long __init sclp_hsa_size_init(struct sdias_sccb *sccb)
{
	sccb_init_eq_size(sccb);
	if (sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_DATA, sccb))
		return -EIO;
	if (sccb->evbuf.blk_cnt == 0)
		return 0;
	return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE;
}

static long __init sclp_hsa_copy_wait(struct sccb_header *sccb)
{
	memset(sccb, 0, PAGE_SIZE);
	sccb->length = PAGE_SIZE;
	if (sclp_cmd_early(SCLP_CMDW_READ_EVENT_DATA, sccb))
		return -EIO;
	if (((struct sdias_sccb *) sccb)->evbuf.blk_cnt == 0)
		return 0;
	return (((struct sdias_sccb *) sccb)->evbuf.blk_cnt - 1) * PAGE_SIZE;
}

static void __init sclp_hsa_size_detect(void *sccb)
{
	long size;

	/* First try synchronous interface (LPAR) */
	if (sclp_set_event_mask(sccb, 0, 0x40000010))
		return;
	size = sclp_hsa_size_init(sccb);
	if (size < 0)
		return;
	if (size != 0)
		goto out;
	/* Then try asynchronous interface (z/VM) */
	if (sclp_set_event_mask(sccb, 0x00000010, 0x40000010))
		return;
	size = sclp_hsa_size_init(sccb);
	if (size < 0)
		return;
	size = sclp_hsa_copy_wait(sccb);
	if (size < 0)
		return;
out:
	sclp.hsa_size = size;
}

static unsigned int __init sclp_con_check_linemode(struct init_sccb *sccb)
{
	if (!(sccb->sclp_send_mask & EVTYP_OPCMD_MASK))
		return 0;
	if (!(sccb->sclp_receive_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK)))
		return 0;
	return 1;
}

static void __init sclp_console_detect(struct init_sccb *sccb)
{
	if (sccb->header.response_code != 0x20)
		return;

	if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK)
		sclp.has_vt220 = 1;

	if (sclp_con_check_linemode(sccb))
		sclp.has_linemode = 1;
}

void __init sclp_early_detect(void)
{
	void *sccb = &sccb_early;

	sclp_facilities_detect(sccb);
	sclp_hsa_size_detect(sccb);

	/* Turn off SCLP event notifications.  Also save remote masks in the
	 * sccb.  These are sufficient to detect sclp console capabilities.
	 */
	sclp_set_event_mask(sccb, 0, 0);
	sclp_console_detect(sccb);
}