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s390-bios: Support for running format-0/1 channel programs

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Introduce a library function for executing format-0 and format-1
channel programs and waiting for their completion before continuing
execution.

Add cu_type() to channel io library. This will be used to query control
unit type which is used to determine if we are booting a virtio device or a
real dasd device.

Signed-off-by: Jason J. Herne <jjherne@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Farhan Ali <alifm@linux.ibm.com>
Message-Id: <1554388475-18329-9-git-send-email-jjherne@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Jason J. Herne 2019-04-04 10:34:27 -04:00 committed by Thomas Huth
parent 1fb3e5cde8
commit 3083a1bbb8
4 changed files with 301 additions and 3 deletions
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144
pc-bios/s390-ccw/cio.c
View File

@ -13,10 +13,14 @@
#include "libc.h"
#include "s390-ccw.h"
#include "s390-arch.h"
#include "helper.h"
#include "cio.h"
static char chsc_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
static int __do_cio(SubChannelId schid, uint32_t ccw_addr, int fmt, Irb *irb);
int enable_mss_facility(void)
{
int ret;
@ -42,3 +46,143 @@ void enable_subchannel(SubChannelId schid)
schib.pmcw.ena = 1;
msch(schid, &schib);
}
uint16_t cu_type(SubChannelId schid)
{
Ccw1 sense_id_ccw;
SenseId sense_data;
sense_id_ccw.cmd_code = CCW_CMD_SENSE_ID;
sense_id_ccw.cda = ptr2u32(&sense_data);
sense_id_ccw.count = sizeof(sense_data);
sense_id_ccw.flags |= CCW_FLAG_SLI;
if (do_cio(schid, CU_TYPE_UNKNOWN, ptr2u32(&sense_id_ccw), CCW_FMT1)) {
panic("Failed to run SenseID CCw\n");
}
return sense_data.cu_type;
}
int basic_sense(SubChannelId schid, uint16_t cutype, void *sense_data,
uint16_t data_size)
{
Ccw1 senseCcw;
Irb irb;
senseCcw.cmd_code = CCW_CMD_BASIC_SENSE;
senseCcw.cda = ptr2u32(sense_data);
senseCcw.count = data_size;
return __do_cio(schid, ptr2u32(&senseCcw), CCW_FMT1, &irb);
}
static bool irb_error(Irb *irb)
{
if (irb->scsw.cstat) {
return true;
}
return irb->scsw.dstat != (SCSW_DSTAT_DEVEND | SCSW_DSTAT_CHEND);
}
/*
* Handles executing ssch, tsch and returns the irb obtained from tsch.
* Returns 0 on success, -1 if unexpected status pending and we need to retry,
* otherwise returns condition code from ssch/tsch for error cases.
*/
static int __do_cio(SubChannelId schid, uint32_t ccw_addr, int fmt, Irb *irb)
{
CmdOrb orb = {};
int rc;
IPL_assert(fmt == 0 || fmt == 1, "Invalid ccw format");
/* ccw_addr must be <= 24 bits and point to at least one whole ccw. */
if (fmt == 0) {
IPL_assert(ccw_addr <= 0xFFFFFF - 8, "Invalid ccw address");
}
orb.fmt = fmt;
orb.pfch = 1; /* QEMU's cio implementation requires prefetch */
orb.c64 = 1; /* QEMU's cio implementation requires 64-bit idaws */
orb.lpm = 0xFF; /* All paths allowed */
orb.cpa = ccw_addr;
rc = ssch(schid, &orb);
if (rc == 1 || rc == 2) {
/* Subchannel status pending or busy. Eat status and ask for retry. */
tsch(schid, irb);
return -1;
}
if (rc) {
print_int("ssch failed with cc=", rc);
return rc;
}
consume_io_int();
/* collect status */
rc = tsch(schid, irb);
if (rc) {
print_int("tsch failed with cc=", rc);
}
return rc;
}
/*
* Executes a channel program at a given subchannel. The request to run the
* channel program is sent to the subchannel, we then wait for the interrupt
* signaling completion of the I/O operation(s) performed by the channel
* program. Lastly we verify that the i/o operation completed without error and
* that the interrupt we received was for the subchannel used to run the
* channel program.
*
* Note: This function assumes it is running in an environment where no other
* cpus are generating or receiving I/O interrupts. So either run it in a
* single-cpu environment or make sure all other cpus are not doing I/O and
* have I/O interrupts masked off. We also assume that only one device is
* active (generating i/o interrupts).
*
* Returns non-zero on error.
*/
int do_cio(SubChannelId schid, uint16_t cutype, uint32_t ccw_addr, int fmt)
{
Irb irb = {};
SenseDataEckdDasd sd;
int rc, retries = 0;
while (true) {
rc = __do_cio(schid, ccw_addr, fmt, &irb);
if (rc == -1) {
retries++;
continue;
}
if (rc) {
/* ssch/tsch error. Message already reported by __do_cio */
break;
}
if (!irb_error(&irb)) {
break;
}
/*
* Unexpected unit check, or interface-control-check. Use sense to
* clear (unit check only) then retry.
*/
if ((unit_check(&irb) || iface_ctrl_check(&irb)) && retries <= 2) {
if (unit_check(&irb)) {
basic_sense(schid, cutype, &sd, sizeof(sd));
}
retries++;
continue;
}
rc = -1;
break;
}
return rc;
}

130
pc-bios/s390-ccw/cio.h
View File

@ -70,9 +70,46 @@ struct scsw {
__u16 count;
} __attribute__ ((packed));
#define SCSW_FCTL_CLEAR_FUNC 0x1000
#define SCSW_FCTL_HALT_FUNC 0x2000
/* Function Control */
#define SCSW_FCTL_START_FUNC 0x4000
#define SCSW_FCTL_HALT_FUNC 0x2000
#define SCSW_FCTL_CLEAR_FUNC 0x1000
/* Activity Control */
#define SCSW_ACTL_RESUME_PEND 0x0800
#define SCSW_ACTL_START_PEND 0x0400
#define SCSW_ACTL_HALT_PEND 0x0200
#define SCSW_ACTL_CLEAR_PEND 0x0100
#define SCSW_ACTL_CH_ACTIVE 0x0080
#define SCSW_ACTL_DEV_ACTIVE 0x0040
#define SCSW_ACTL_SUSPENDED 0x0020
/* Status Control */
#define SCSW_SCTL_ALERT 0x0010
#define SCSW_SCTL_INTERMED 0x0008
#define SCSW_SCTL_PRIMARY 0x0004
#define SCSW_SCTL_SECONDARY 0x0002
#define SCSW_SCTL_STATUS_PEND 0x0001
/* SCSW Device Status Flags */
#define SCSW_DSTAT_ATTN 0x80
#define SCSW_DSTAT_STATMOD 0x40
#define SCSW_DSTAT_CUEND 0x20
#define SCSW_DSTAT_BUSY 0x10
#define SCSW_DSTAT_CHEND 0x08
#define SCSW_DSTAT_DEVEND 0x04
#define SCSW_DSTAT_UCHK 0x02
#define SCSW_DSTAT_UEXCP 0x01
/* SCSW Subchannel Status Flags */
#define SCSW_CSTAT_PCINT 0x80
#define SCSW_CSTAT_BADLEN 0x40
#define SCSW_CSTAT_PROGCHK 0x20
#define SCSW_CSTAT_PROTCHK 0x10
#define SCSW_CSTAT_CHDCHK 0x08
#define SCSW_CSTAT_CHCCHK 0x04
#define SCSW_CSTAT_ICCHK 0x02
#define SCSW_CSTAT_CHAINCHK 0x01
/*
* subchannel information block
@ -127,7 +164,23 @@ struct tpi_info {
__u32 reserved4:12;
} __attribute__ ((packed, aligned(4)));
/* channel command word (type 1) */
/* channel command word (format 0) */
typedef struct ccw0 {
__u8 cmd_code;
__u32 cda:24;
__u32 chainData:1;
__u32 chain:1;
__u32 sli:1;
__u32 skip:1;
__u32 pci:1;
__u32 ida:1;
__u32 suspend:1;
__u32 mida:1;
__u8 reserved;
__u16 count;
} __attribute__ ((packed, aligned(8))) Ccw0;
/* channel command word (format 1) */
typedef struct ccw1 {
__u8 cmd_code;
__u8 flags;
@ -135,6 +188,10 @@ typedef struct ccw1 {
__u32 cda;
} __attribute__ ((packed, aligned(8))) Ccw1;
/* do_cio() CCW formats */
#define CCW_FMT0 0x00
#define CCW_FMT1 0x01
#define CCW_FLAG_DC 0x80
#define CCW_FLAG_CC 0x40
#define CCW_FLAG_SLI 0x20
@ -190,6 +247,11 @@ struct ciw {
__u16 count;
};
#define CU_TYPE_UNKNOWN 0x0000
#define CU_TYPE_DASD_2107 0x2107
#define CU_TYPE_VIRTIO 0x3832
#define CU_TYPE_DASD_3990 0x3990
/*
* sense-id response buffer layout
*/
@ -205,6 +267,64 @@ typedef struct senseid {
struct ciw ciw[62];
} __attribute__ ((packed, aligned(4))) SenseId;
/*
* architected values for first sense byte - common_status. Bits 0-5 of this
* field are common to all device types.
*/
#define SNS_STAT0_CMD_REJECT 0x80
#define SNS_STAT0_INTERVENTION_REQ 0x40
#define SNS_STAT0_BUS_OUT_CHECK 0x20
#define SNS_STAT0_EQUIPMENT_CHECK 0x10
#define SNS_STAT0_DATA_CHECK 0x08
#define SNS_STAT0_OVERRUN 0x04
#define SNS_STAT0_INCOMPL_DOMAIN 0x01
/* ECKD DASD status[0] byte */
#define SNS_STAT1_PERM_ERR 0x80
#define SNS_STAT1_INV_TRACK_FORMAT 0x40
#define SNS_STAT1_EOC 0x20
#define SNS_STAT1_MESSAGE_TO_OPER 0x10
#define SNS_STAT1_NO_REC_FOUND 0x08
#define SNS_STAT1_FILE_PROTECTED 0x04
#define SNS_STAT1_WRITE_INHIBITED 0x02
#define SNS_STAT1_IMPRECISE_END 0x01
/* ECKD DASD status[1] byte */
#define SNS_STAT2_REQ_INH_WRITE 0x80
#define SNS_STAT2_CORRECTABLE 0x40
#define SNS_STAT2_FIRST_LOG_ERR 0x20
#define SNS_STAT2_ENV_DATA_PRESENT 0x10
#define SNS_STAT2_IMPRECISE_END 0x04
/* ECKD DASD 24-byte Sense fmt_msg codes */
#define SENSE24_FMT_PROG_SYS 0x0
#define SENSE24_FMT_EQUIPMENT 0x2
#define SENSE24_FMT_CONTROLLER 0x3
#define SENSE24_FMT_MISC 0xF
/* basic sense response buffer layout */
typedef struct SenseDataEckdDasd {
uint8_t common_status;
uint8_t status[2];
uint8_t res_count;
uint8_t phys_drive_id;
uint8_t low_cyl_addr;
uint8_t head_high_cyl_addr;
uint8_t fmt_msg;
uint64_t fmt_dependent_info[2];
uint8_t reserved;
uint8_t program_action_code;
uint16_t config_info;
uint8_t mcode_hicyl;
uint8_t cyl_head_addr[3];
} __attribute__ ((packed, aligned(4))) SenseDataEckdDasd;
#define ECKD_SENSE24_GET_FMT(sd) (sd->fmt_msg & 0xF0 >> 4)
#define ECKD_SENSE24_GET_MSG(sd) (sd->fmt_msg & 0x0F)
#define unit_check(irb) ((irb)->scsw.dstat & SCSW_DSTAT_UCHK)
#define iface_ctrl_check(irb) ((irb)->scsw.cstat & SCSW_CSTAT_ICCHK)
/* interruption response block */
typedef struct irb {
struct scsw scsw;
@ -215,6 +335,10 @@ typedef struct irb {
int enable_mss_facility(void);
void enable_subchannel(SubChannelId schid);
uint16_t cu_type(SubChannelId schid);
int basic_sense(SubChannelId schid, uint16_t cutype, void *sense_data,
uint16_t data_size);
int do_cio(SubChannelId schid, uint16_t cutype, uint32_t ccw_addr, int fmt);
/*
* Some S390 specific IO instructions as inline

1
pc-bios/s390-ccw/s390-ccw.h
View File

@ -52,6 +52,7 @@ typedef unsigned long long __u64;
/* start.s */
void disabled_wait(void);
void consume_sclp_int(void);
void consume_io_int(void);
/* main.c */
void panic(const char *string);

29
pc-bios/s390-ccw/start.S
View File

@ -71,6 +71,26 @@ consume_sclp_int:
larl %r1, enabled_wait_psw
lpswe 0(%r1)
/*
* void consume_io_int(void)
*
* eats one I/O interrupt
*/
.globl consume_io_int
consume_io_int:
/* enable I/O interrupts in cr6 */
stctg %c6,%c6,0(%r15)
oi 4(%r15), 0xff
lctlg %c6,%c6,0(%r15)
/* prepare i/o call handler */
larl %r1, io_new_code
stg %r1, 0x1f8
larl %r1, io_new_mask
mvc 0x1f0(8),0(%r1)
/* load enabled wait PSW */
larl %r1, enabled_wait_psw
lpswe 0(%r1)
external_new_code:
/* disable service interrupts in cr0 */
stctg %c0,%c0,0(%r15)
@ -78,6 +98,13 @@ external_new_code:
lctlg %c0,%c0,0(%r15)
br %r14
io_new_code:
/* disable I/O interrupts in cr6 */
stctg %c6,%c6,0(%r15)
ni 4(%r15), 0x00
lctlg %c6,%c6,0(%r15)
br %r14
.align 8
disabled_wait_psw:
.quad 0x0002000180000000,0x0000000000000000
@ -85,3 +112,5 @@ enabled_wait_psw:
.quad 0x0302000180000000,0x0000000000000000
external_new_mask:
.quad 0x0000000180000000
io_new_mask:
.quad 0x0000000180000000