[deliverable/linux.git] / drivers / s390 / char / sclp_early.c

/*
 * SCLP early driver
 *
 * Copyright IBM Corp. 2013
 */

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

#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	_reserved0[16 - 11];	/* 11-15 */
	u16	ncpurl;			/* 16-17 */
	u8	_reserved7[24 - 18];	/* 18-23 */
	u8	loadparm[8];		/* 24-31 */
	u8	_reserved1[48 - 32];	/* 32-47 */
	u64	facilities;		/* 48-55 */
	u8	_reserved2[84 - 56];	/* 56-83 */
	u8	fac84;			/* 84 */
	u8	fac85;			/* 85 */
	u8	_reserved3[91 - 86];	/* 86-90 */
	u8	flags;			/* 91 */
	u8	_reserved4[100 - 92];	/* 92-99 */
	u32	rnsize2;		/* 100-103 */
	u64	rnmax2;			/* 104-111 */
	u8	_reserved5[120 - 112];	/* 112-119 */
	u16	hcpua;			/* 120-121 */
	u8	_reserved6[4096 - 122];	/* 122-4095 */
} __packed __aligned(PAGE_SIZE);

static char sccb_early[PAGE_SIZE] __aligned(PAGE_SIZE) __initdata;
static unsigned int sclp_con_has_vt220 __initdata;
static unsigned int sclp_con_has_linemode __initdata;
static unsigned long sclp_hsa_size;
static unsigned int sclp_max_cpu;
static struct sclp_ipl_info sclp_ipl_info;

u64 sclp_facilities;
u8 sclp_fac84;
unsigned long long sclp_rzm;
unsigned long long sclp_rnmax;

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)
{
	if (sclp_read_info_early(sccb))
		return;

	sclp_facilities = sccb->facilities;
	sclp_fac84 = sccb->fac84;
	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;

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

	/* 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);
}

bool __init sclp_has_linemode(void)
{
	return !!sclp_con_has_linemode;
}

bool __init sclp_has_vt220(void)
{
	return !!sclp_con_has_vt220;
}

unsigned long long sclp_get_rnmax(void)
{
	return sclp_rnmax;
}

unsigned long long sclp_get_rzm(void)
{
	return sclp_rzm;
}

unsigned int sclp_get_max_cpu(void)
{
	return sclp_max_cpu;
}

/*
 * 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;
}

unsigned long sclp_get_hsa_size(void)
{
	return sclp_hsa_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 | EVTYP_PMSGCMD_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_con_has_vt220 = 1;

	if (sclp_con_check_linemode(sccb))
		sclp_con_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);
}
Commit	Line	Data
e657d8fe MH	1	/*
	2	* SCLP early driver
	3	*
	4	* Copyright IBM Corp. 2013
	5	*/
	6
	7	#define KMSG_COMPONENT "sclp_early"
	8	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	9
acf6a004	10	#include <asm/ctl_reg.h>
e657d8fe MH	11	#include <asm/sclp.h>
	12	#include <asm/ipl.h>
	13	#include "sclp_sdias.h"
	14	#include "sclp.h"
	15
acf6a004 MH	16	#define SCLP_CMDW_READ_SCP_INFO 0x00020001
	17	#define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
	18
	19	struct read_info_sccb {
	20	struct sccb_header header; /* 0-7 */
	21	u16 rnmax; /* 8-9 */
	22	u8 rnsize; /* 10 */
cf813db0 HC	23	u8 _reserved0[16 - 11]; /* 11-15 */
	24	u16 ncpurl; /* 16-17 */
	25	u8 _reserved7[24 - 18]; /* 18-23 */
acf6a004 MH	26	u8 loadparm[8]; /* 24-31 */
	27	u8 _reserved1[48 - 32]; /* 32-47 */
	28	u64 facilities; /* 48-55 */
	29	u8 _reserved2[84 - 56]; /* 56-83 */
	30	u8 fac84; /* 84 */
	31	u8 fac85; /* 85 */
	32	u8 _reserved3[91 - 86]; /* 86-90 */
	33	u8 flags; /* 91 */
	34	u8 _reserved4[100 - 92]; /* 92-99 */
	35	u32 rnsize2; /* 100-103 */
	36	u64 rnmax2; /* 104-111 */
cf813db0 HC	37	u8 _reserved5[120 - 112]; /* 112-119 */
	38	u16 hcpua; /* 120-121 */
	39	u8 _reserved6[4096 - 122]; /* 122-4095 */
acf6a004 MH	40	} __packed __aligned(PAGE_SIZE);
acf6a004 MH	41
56e57a84	42	static char sccb_early[PAGE_SIZE] __aligned(PAGE_SIZE) __initdata;
52733e01 HB	43	static unsigned int sclp_con_has_vt220 __initdata;
52733e01 HB	44	static unsigned int sclp_con_has_linemode __initdata;
e657d8fe	45	static unsigned long sclp_hsa_size;
cf813db0	46	static unsigned int sclp_max_cpu;
333cce91	47	static struct sclp_ipl_info sclp_ipl_info;
e657d8fe	48
acf6a004 MH	49	u64 sclp_facilities;
	50	u8 sclp_fac84;
	51	unsigned long long sclp_rzm;
	52	unsigned long long sclp_rnmax;
	53
	54	static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
	55	{
	56	int rc;
	57
	58	__ctl_set_bit(0, 9);
	59	rc = sclp_service_call(cmd, sccb);
	60	if (rc)
	61	goto out;
	62	__load_psw_mask(PSW_DEFAULT_KEY \| PSW_MASK_BASE \| PSW_MASK_EA \|
	63	PSW_MASK_BA \| PSW_MASK_EXT \| PSW_MASK_WAIT);
	64	local_irq_disable();
	65	out:
	66	/* Contents of the sccb might have changed. */
	67	barrier();
	68	__ctl_clear_bit(0, 9);
	69	return rc;
	70	}
	71
56e57a84	72	static int __init sclp_read_info_early(struct read_info_sccb *sccb)
acf6a004	73	{
333cce91	74	int rc, i;
acf6a004 MH	75	sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
	76	SCLP_CMDW_READ_SCP_INFO};
	77
acf6a004 MH	78	for (i = 0; i < ARRAY_SIZE(commands); i++) {
	79	do {
	80	memset(sccb, 0, sizeof(*sccb));
	81	sccb->header.length = sizeof(*sccb);
	82	sccb->header.function_code = 0x80;
	83	sccb->header.control_mask[2] = 0x80;
	84	rc = sclp_cmd_sync_early(commands[i], sccb);
	85	} while (rc == -EBUSY);
	86
	87	if (rc)
	88	break;
333cce91 HB	89	if (sccb->header.response_code == 0x10)
333cce91 HB	90	return 0;
acf6a004 MH	91	if (sccb->header.response_code != 0x1f0)
	92	break;
	93	}
333cce91	94	return -EIO;
acf6a004 MH	95	}
acf6a004 MH	96
5d5de1a0	97	static void __init sclp_facilities_detect(struct read_info_sccb *sccb)
acf6a004	98	{
56e57a84	99	if (sclp_read_info_early(sccb))
acf6a004 MH	100	return;
acf6a004 MH	101
acf6a004 MH	102	sclp_facilities = sccb->facilities;
	103	sclp_fac84 = sccb->fac84;
	104	if (sccb->fac85 & 0x02)
	105	S390_lowcore.machine_flags \|= MACHINE_FLAG_ESOP;
	106	sclp_rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
	107	sclp_rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
	108	sclp_rzm <<= 20;
333cce91	109
cf813db0 HC	110	if (!sccb->hcpua) {
	111	if (MACHINE_IS_VM)
	112	sclp_max_cpu = 64;
	113	else
	114	sclp_max_cpu = sccb->ncpurl;
	115	} else {
	116	sclp_max_cpu = sccb->hcpua + 1;
	117	}
	118
333cce91 HB	119	/* Save IPL information */
	120	sclp_ipl_info.is_valid = 1;
	121	if (sccb->flags & 0x2)
	122	sclp_ipl_info.has_dump = 1;
	123	memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN);
acf6a004 MH	124	}
	125
	126	bool __init sclp_has_linemode(void)
	127	{
52733e01	128	return !!sclp_con_has_linemode;
acf6a004 MH	129	}
	130
	131	bool __init sclp_has_vt220(void)
	132	{
52733e01	133	return !!sclp_con_has_vt220;
acf6a004 MH	134	}
	135
	136	unsigned long long sclp_get_rnmax(void)
	137	{
	138	return sclp_rnmax;
	139	}
	140
	141	unsigned long long sclp_get_rzm(void)
	142	{
	143	return sclp_rzm;
	144	}
	145
cf813db0 HC	146	unsigned int sclp_get_max_cpu(void)
	147	{
	148	return sclp_max_cpu;
	149	}
	150
acf6a004 MH	151	/*
acf6a004 MH	152	* This function will be called after sclp_facilities_detect(), which gets
333cce91 HB	153	* called from early.c code. The sclp_facilities_detect() function retrieves
333cce91 HB	154	* and saves the IPL information.
acf6a004 MH	155	*/
	156	void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
	157	{
333cce91	158	*info = sclp_ipl_info;
acf6a004 MH	159	}
acf6a004 MH	160
e657d8fe MH	161	static int __init sclp_cmd_early(sclp_cmdw_t cmd, void *sccb)
	162	{
	163	int rc;
	164
	165	do {
	166	rc = sclp_cmd_sync_early(cmd, sccb);
	167	} while (rc == -EBUSY);
	168
	169	if (rc)
	170	return -EIO;
	171	if (((struct sccb_header *) sccb)->response_code != 0x0020)
	172	return -EIO;
	173	return 0;
	174	}
	175
	176	static void __init sccb_init_eq_size(struct sdias_sccb *sccb)
	177	{
	178	memset(sccb, 0, sizeof(*sccb));
	179
	180	sccb->hdr.length = sizeof(*sccb);
	181	sccb->evbuf.hdr.length = sizeof(struct sdias_evbuf);
	182	sccb->evbuf.hdr.type = EVTYP_SDIAS;
	183	sccb->evbuf.event_qual = SDIAS_EQ_SIZE;
	184	sccb->evbuf.data_id = SDIAS_DI_FCP_DUMP;
	185	sccb->evbuf.event_id = 4712;
	186	sccb->evbuf.dbs = 1;
	187	}
	188
5d5de1a0 HB	189	static int __init sclp_set_event_mask(struct init_sccb *sccb,
5d5de1a0 HB	190	unsigned long receive_mask,
e657d8fe MH	191	unsigned long send_mask)
e657d8fe MH	192	{
e657d8fe MH	193	memset(sccb, 0, sizeof(*sccb));
	194	sccb->header.length = sizeof(*sccb);
	195	sccb->mask_length = sizeof(sccb_mask_t);
	196	sccb->receive_mask = receive_mask;
	197	sccb->send_mask = send_mask;
	198	return sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb);
	199	}
	200
5d5de1a0	201	static long __init sclp_hsa_size_init(struct sdias_sccb *sccb)
e657d8fe	202	{
e657d8fe MH	203	sccb_init_eq_size(sccb);
	204	if (sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_DATA, sccb))
	205	return -EIO;
9499934f MH	206	if (sccb->evbuf.blk_cnt == 0)
	207	return 0;
	208	return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE;
e657d8fe MH	209	}
e657d8fe MH	210
5d5de1a0	211	static long __init sclp_hsa_copy_wait(struct sccb_header *sccb)
e657d8fe	212	{
e657d8fe MH	213	memset(sccb, 0, PAGE_SIZE);
	214	sccb->length = PAGE_SIZE;
	215	if (sclp_cmd_early(SCLP_CMDW_READ_EVENT_DATA, sccb))
	216	return -EIO;
9499934f MH	217	if (((struct sdias_sccb *) sccb)->evbuf.blk_cnt == 0)
9499934f MH	218	return 0;
e657d8fe MH	219	return (((struct sdias_sccb ) sccb)->evbuf.blk_cnt - 1) PAGE_SIZE;
	220	}
	221
	222	unsigned long sclp_get_hsa_size(void)
	223	{
	224	return sclp_hsa_size;
	225	}
	226
5d5de1a0	227	static void __init sclp_hsa_size_detect(void *sccb)
e657d8fe MH	228	{
	229	long size;
	230
	231	/* First try synchronous interface (LPAR) */
5d5de1a0	232	if (sclp_set_event_mask(sccb, 0, 0x40000010))
e657d8fe	233	return;
5d5de1a0	234	size = sclp_hsa_size_init(sccb);
e657d8fe MH	235	if (size < 0)
	236	return;
	237	if (size != 0)
	238	goto out;
	239	/* Then try asynchronous interface (z/VM) */
5d5de1a0	240	if (sclp_set_event_mask(sccb, 0x00000010, 0x40000010))
e657d8fe	241	return;
5d5de1a0	242	size = sclp_hsa_size_init(sccb);
e657d8fe MH	243	if (size < 0)
e657d8fe MH	244	return;
5d5de1a0	245	size = sclp_hsa_copy_wait(sccb);
e657d8fe MH	246	if (size < 0)
	247	return;
	248	out:
e657d8fe MH	249	sclp_hsa_size = size;
e657d8fe MH	250	}
7b50da53	251
52733e01 HB	252	static unsigned int __init sclp_con_check_linemode(struct init_sccb *sccb)
	253	{
	254	if (!(sccb->sclp_send_mask & (EVTYP_OPCMD_MASK \| EVTYP_PMSGCMD_MASK)))
	255	return 0;
	256	if (!(sccb->sclp_receive_mask & (EVTYP_MSG_MASK \| EVTYP_PMSGCMD_MASK)))
	257	return 0;
	258	return 1;
	259	}
	260
	261	static void __init sclp_console_detect(struct init_sccb *sccb)
	262	{
	263	if (sccb->header.response_code != 0x20)
	264	return;
	265
	266	if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK)
	267	sclp_con_has_vt220 = 1;
	268
	269	if (sclp_con_check_linemode(sccb))
	270	sclp_con_has_linemode = 1;
	271	}
	272
7b50da53 MH	273	void __init sclp_early_detect(void)
7b50da53 MH	274	{
5d5de1a0 HB	275	void *sccb = &sccb_early;
	276
	277	sclp_facilities_detect(sccb);
	278	sclp_hsa_size_detect(sccb);
52733e01 HB	279
	280	/* Turn off SCLP event notifications. Also save remote masks in the
	281	* sccb. These are sufficient to detect sclp console capabilities.
	282	*/
5d5de1a0	283	sclp_set_event_mask(sccb, 0, 0);
52733e01	284	sclp_console_detect(sccb);
7b50da53	285	}