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![Janosch Frank](/assets/img/avatar_default.png)
Let's initialize the structs at the beginning to ease reading and also zeroing all other fields. This also makes the compiler stop complaining about sense_id_ccw.flags being ored into when it's not initialized. Signed-off-by: Janosch Frank <frankja@linux.ibm.com> Reviewed-by: Pierre Morel <pmorel@linux.ibm.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Message-Id: <20200624075226.92728-2-frankja@linux.ibm.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
428 lines
12 KiB
C
428 lines
12 KiB
C
/*
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* S390 Channel I/O
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*
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* Copyright (c) 2013 Alexander Graf <agraf@suse.de>
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* Copyright (c) 2019 IBM Corp.
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*
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* Author(s): Jason J. Herne <jjherne@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#include "libc.h"
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#include "s390-ccw.h"
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#include "s390-arch.h"
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#include "helper.h"
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#include "cio.h"
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static char chsc_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
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static int __do_cio(SubChannelId schid, uint32_t ccw_addr, int fmt, Irb *irb);
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int enable_mss_facility(void)
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{
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int ret;
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ChscAreaSda *sda_area = (ChscAreaSda *) chsc_page;
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memset(sda_area, 0, PAGE_SIZE);
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sda_area->request.length = 0x0400;
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sda_area->request.code = 0x0031;
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sda_area->operation_code = 0x2;
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ret = chsc(sda_area);
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if ((ret == 0) && (sda_area->response.code == 0x0001)) {
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return 0;
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}
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return -EIO;
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}
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void enable_subchannel(SubChannelId schid)
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{
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Schib schib;
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stsch_err(schid, &schib);
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schib.pmcw.ena = 1;
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msch(schid, &schib);
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}
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uint16_t cu_type(SubChannelId schid)
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{
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SenseId sense_data;
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Ccw1 sense_id_ccw = {
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.cmd_code = CCW_CMD_SENSE_ID,
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.flags = CCW_FLAG_SLI,
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.count = sizeof(sense_data),
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.cda = ptr2u32(&sense_data),
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};
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if (do_cio(schid, CU_TYPE_UNKNOWN, ptr2u32(&sense_id_ccw), CCW_FMT1)) {
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panic("Failed to run SenseID CCw\n");
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}
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return sense_data.cu_type;
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}
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int basic_sense(SubChannelId schid, uint16_t cutype, void *sense_data,
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uint16_t data_size)
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{
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Ccw1 senseCcw = {
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.cmd_code = CCW_CMD_BASIC_SENSE,
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.count = data_size,
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.cda = ptr2u32(sense_data),
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};
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Irb irb;
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return __do_cio(schid, ptr2u32(&senseCcw), CCW_FMT1, &irb);
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}
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static bool irb_error(Irb *irb)
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{
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if (irb->scsw.cstat) {
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return true;
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}
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return irb->scsw.dstat != (SCSW_DSTAT_DEVEND | SCSW_DSTAT_CHEND);
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}
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static void print_eckd_dasd_sense_data(SenseDataEckdDasd *sd)
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{
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char msgline[512];
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if (sd->config_info & 0x8000) {
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sclp_print("Eckd Dasd Sense Data (fmt 24-bytes):\n");
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} else {
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sclp_print("Eckd Dasd Sense Data (fmt 32-bytes):\n");
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}
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strcat(msgline, " Sense Condition Flags :");
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if (sd->common_status & SNS_STAT0_CMD_REJECT) {
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strcat(msgline, " [Cmd-Reject]");
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}
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if (sd->common_status & SNS_STAT0_INTERVENTION_REQ) {
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strcat(msgline, " [Intervention-Required]");
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}
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if (sd->common_status & SNS_STAT0_BUS_OUT_CHECK) {
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strcat(msgline, " [Bus-Out-Parity-Check]");
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}
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if (sd->common_status & SNS_STAT0_EQUIPMENT_CHECK) {
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strcat(msgline, " [Equipment-Check]");
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}
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if (sd->common_status & SNS_STAT0_DATA_CHECK) {
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strcat(msgline, " [Data-Check]");
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}
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if (sd->common_status & SNS_STAT0_OVERRUN) {
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strcat(msgline, " [Overrun]");
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}
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if (sd->common_status & SNS_STAT0_INCOMPL_DOMAIN) {
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strcat(msgline, " [Incomplete-Domain]");
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}
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if (sd->status[0] & SNS_STAT1_PERM_ERR) {
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strcat(msgline, " [Permanent-Error]");
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}
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if (sd->status[0] & SNS_STAT1_INV_TRACK_FORMAT) {
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strcat(msgline, " [Invalid-Track-Fmt]");
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}
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if (sd->status[0] & SNS_STAT1_EOC) {
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strcat(msgline, " [End-of-Cyl]");
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}
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if (sd->status[0] & SNS_STAT1_MESSAGE_TO_OPER) {
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strcat(msgline, " [Operator-Msg]");
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}
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if (sd->status[0] & SNS_STAT1_NO_REC_FOUND) {
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strcat(msgline, " [No-Record-Found]");
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}
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if (sd->status[0] & SNS_STAT1_FILE_PROTECTED) {
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strcat(msgline, " [File-Protected]");
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}
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if (sd->status[0] & SNS_STAT1_WRITE_INHIBITED) {
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strcat(msgline, " [Write-Inhibited]");
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}
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if (sd->status[0] & SNS_STAT1_IMPRECISE_END) {
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strcat(msgline, " [Imprecise-Ending]");
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}
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if (sd->status[1] & SNS_STAT2_REQ_INH_WRITE) {
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strcat(msgline, " [Req-Inhibit-Write]");
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}
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if (sd->status[1] & SNS_STAT2_CORRECTABLE) {
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strcat(msgline, " [Correctable-Data-Check]");
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}
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if (sd->status[1] & SNS_STAT2_FIRST_LOG_ERR) {
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strcat(msgline, " [First-Error-Log]");
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}
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if (sd->status[1] & SNS_STAT2_ENV_DATA_PRESENT) {
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strcat(msgline, " [Env-Data-Present]");
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}
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if (sd->status[1] & SNS_STAT2_IMPRECISE_END) {
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strcat(msgline, " [Imprecise-End]");
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}
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strcat(msgline, "\n");
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sclp_print(msgline);
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print_int(" Residual Count =", sd->res_count);
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print_int(" Phys Drive ID =", sd->phys_drive_id);
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print_int(" low cyl address =", sd->low_cyl_addr);
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print_int(" head addr & hi cyl =", sd->head_high_cyl_addr);
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print_int(" format/message =", sd->fmt_msg);
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print_int(" fmt-dependent[0-7] =", sd->fmt_dependent_info[0]);
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print_int(" fmt-dependent[8-15]=", sd->fmt_dependent_info[1]);
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print_int(" prog action code =", sd->program_action_code);
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print_int(" Configuration info =", sd->config_info);
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print_int(" mcode / hi-cyl =", sd->mcode_hicyl);
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print_int(" cyl & head addr [0]=", sd->cyl_head_addr[0]);
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print_int(" cyl & head addr [1]=", sd->cyl_head_addr[1]);
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print_int(" cyl & head addr [2]=", sd->cyl_head_addr[2]);
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}
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static void print_irb_err(Irb *irb)
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{
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uint64_t this_ccw = *(uint64_t *)u32toptr(irb->scsw.cpa);
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uint64_t prev_ccw = *(uint64_t *)u32toptr(irb->scsw.cpa - 8);
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char msgline[256];
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sclp_print("Interrupt Response Block Data:\n");
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strcat(msgline, " Function Ctrl :");
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if (irb->scsw.ctrl & SCSW_FCTL_START_FUNC) {
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strcat(msgline, " [Start]");
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}
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if (irb->scsw.ctrl & SCSW_FCTL_HALT_FUNC) {
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strcat(msgline, " [Halt]");
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}
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if (irb->scsw.ctrl & SCSW_FCTL_CLEAR_FUNC) {
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strcat(msgline, " [Clear]");
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}
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strcat(msgline, "\n");
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sclp_print(msgline);
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msgline[0] = '\0';
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strcat(msgline, " Activity Ctrl :");
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if (irb->scsw.ctrl & SCSW_ACTL_RESUME_PEND) {
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strcat(msgline, " [Resume-Pending]");
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}
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if (irb->scsw.ctrl & SCSW_ACTL_START_PEND) {
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strcat(msgline, " [Start-Pending]");
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}
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if (irb->scsw.ctrl & SCSW_ACTL_HALT_PEND) {
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strcat(msgline, " [Halt-Pending]");
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}
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if (irb->scsw.ctrl & SCSW_ACTL_CLEAR_PEND) {
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strcat(msgline, " [Clear-Pending]");
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}
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if (irb->scsw.ctrl & SCSW_ACTL_CH_ACTIVE) {
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strcat(msgline, " [Channel-Active]");
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}
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if (irb->scsw.ctrl & SCSW_ACTL_DEV_ACTIVE) {
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strcat(msgline, " [Device-Active]");
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}
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if (irb->scsw.ctrl & SCSW_ACTL_SUSPENDED) {
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strcat(msgline, " [Suspended]");
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}
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strcat(msgline, "\n");
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sclp_print(msgline);
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msgline[0] = '\0';
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strcat(msgline, " Status Ctrl :");
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if (irb->scsw.ctrl & SCSW_SCTL_ALERT) {
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strcat(msgline, " [Alert]");
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}
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if (irb->scsw.ctrl & SCSW_SCTL_INTERMED) {
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strcat(msgline, " [Intermediate]");
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}
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if (irb->scsw.ctrl & SCSW_SCTL_PRIMARY) {
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strcat(msgline, " [Primary]");
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}
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if (irb->scsw.ctrl & SCSW_SCTL_SECONDARY) {
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strcat(msgline, " [Secondary]");
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}
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if (irb->scsw.ctrl & SCSW_SCTL_STATUS_PEND) {
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strcat(msgline, " [Status-Pending]");
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}
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strcat(msgline, "\n");
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sclp_print(msgline);
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msgline[0] = '\0';
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strcat(msgline, " Device Status :");
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if (irb->scsw.dstat & SCSW_DSTAT_ATTN) {
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strcat(msgline, " [Attention]");
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}
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if (irb->scsw.dstat & SCSW_DSTAT_STATMOD) {
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strcat(msgline, " [Status-Modifier]");
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}
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if (irb->scsw.dstat & SCSW_DSTAT_CUEND) {
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strcat(msgline, " [Ctrl-Unit-End]");
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}
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if (irb->scsw.dstat & SCSW_DSTAT_BUSY) {
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strcat(msgline, " [Busy]");
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}
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if (irb->scsw.dstat & SCSW_DSTAT_CHEND) {
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strcat(msgline, " [Channel-End]");
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}
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if (irb->scsw.dstat & SCSW_DSTAT_DEVEND) {
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strcat(msgline, " [Device-End]");
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}
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if (irb->scsw.dstat & SCSW_DSTAT_UCHK) {
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strcat(msgline, " [Unit-Check]");
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}
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if (irb->scsw.dstat & SCSW_DSTAT_UEXCP) {
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strcat(msgline, " [Unit-Exception]");
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}
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strcat(msgline, "\n");
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sclp_print(msgline);
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msgline[0] = '\0';
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strcat(msgline, " Channel Status :");
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if (irb->scsw.cstat & SCSW_CSTAT_PCINT) {
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strcat(msgline, " [Program-Ctrl-Interruption]");
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}
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if (irb->scsw.cstat & SCSW_CSTAT_BADLEN) {
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strcat(msgline, " [Incorrect-Length]");
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}
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if (irb->scsw.cstat & SCSW_CSTAT_PROGCHK) {
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strcat(msgline, " [Program-Check]");
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}
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if (irb->scsw.cstat & SCSW_CSTAT_PROTCHK) {
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strcat(msgline, " [Protection-Check]");
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}
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if (irb->scsw.cstat & SCSW_CSTAT_CHDCHK) {
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strcat(msgline, " [Channel-Data-Check]");
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}
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if (irb->scsw.cstat & SCSW_CSTAT_CHCCHK) {
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strcat(msgline, " [Channel-Ctrl-Check]");
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}
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if (irb->scsw.cstat & SCSW_CSTAT_ICCHK) {
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strcat(msgline, " [Interface-Ctrl-Check]");
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}
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if (irb->scsw.cstat & SCSW_CSTAT_CHAINCHK) {
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strcat(msgline, " [Chaining-Check]");
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}
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strcat(msgline, "\n");
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sclp_print(msgline);
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print_int(" cpa=", irb->scsw.cpa);
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print_int(" prev_ccw=", prev_ccw);
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print_int(" this_ccw=", this_ccw);
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}
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/*
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* Handles executing ssch, tsch and returns the irb obtained from tsch.
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* Returns 0 on success, -1 if unexpected status pending and we need to retry,
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* otherwise returns condition code from ssch/tsch for error cases.
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*/
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static int __do_cio(SubChannelId schid, uint32_t ccw_addr, int fmt, Irb *irb)
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{
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/*
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* QEMU's CIO implementation requires prefetch and 64-bit idaws. We
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* allow all paths.
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*/
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CmdOrb orb = {
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.fmt = fmt,
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.pfch = 1,
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.c64 = 1,
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.lpm = 0xFF,
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.cpa = ccw_addr,
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};
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int rc;
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IPL_assert(fmt == 0 || fmt == 1, "Invalid ccw format");
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/* ccw_addr must be <= 24 bits and point to at least one whole ccw. */
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if (fmt == 0) {
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IPL_assert(ccw_addr <= 0xFFFFFF - 8, "Invalid ccw address");
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}
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rc = ssch(schid, &orb);
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if (rc == 1 || rc == 2) {
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/* Subchannel status pending or busy. Eat status and ask for retry. */
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tsch(schid, irb);
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return -1;
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}
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if (rc) {
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print_int("ssch failed with cc=", rc);
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return rc;
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}
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consume_io_int();
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/* collect status */
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rc = tsch(schid, irb);
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if (rc) {
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print_int("tsch failed with cc=", rc);
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}
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return rc;
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}
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/*
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* Executes a channel program at a given subchannel. The request to run the
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* channel program is sent to the subchannel, we then wait for the interrupt
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* signaling completion of the I/O operation(s) performed by the channel
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* program. Lastly we verify that the i/o operation completed without error and
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* that the interrupt we received was for the subchannel used to run the
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* channel program.
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*
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* Note: This function assumes it is running in an environment where no other
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* cpus are generating or receiving I/O interrupts. So either run it in a
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* single-cpu environment or make sure all other cpus are not doing I/O and
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* have I/O interrupts masked off. We also assume that only one device is
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* active (generating i/o interrupts).
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*
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* Returns non-zero on error.
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*/
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int do_cio(SubChannelId schid, uint16_t cutype, uint32_t ccw_addr, int fmt)
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{
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Irb irb = {};
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SenseDataEckdDasd sd;
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int rc, retries = 0;
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while (true) {
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rc = __do_cio(schid, ccw_addr, fmt, &irb);
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if (rc == -1) {
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retries++;
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continue;
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}
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if (rc) {
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/* ssch/tsch error. Message already reported by __do_cio */
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break;
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}
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if (!irb_error(&irb)) {
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break;
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}
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/*
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* Unexpected unit check, or interface-control-check. Use sense to
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* clear (unit check only) then retry.
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*/
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if ((unit_check(&irb) || iface_ctrl_check(&irb)) && retries <= 2) {
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if (unit_check(&irb)) {
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basic_sense(schid, cutype, &sd, sizeof(sd));
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}
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retries++;
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continue;
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}
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sclp_print("cio device error\n");
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print_int(" ssid ", schid.ssid);
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print_int(" cssid ", schid.cssid);
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print_int(" sch_no", schid.sch_no);
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print_int(" ctrl-unit type", cutype);
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sclp_print("\n");
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print_irb_err(&irb);
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if (cutype == CU_TYPE_DASD_3990 || cutype == CU_TYPE_DASD_2107 ||
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cutype == CU_TYPE_UNKNOWN) {
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if (!basic_sense(schid, cutype, &sd, sizeof(sd))) {
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print_eckd_dasd_sense_data(&sd);
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}
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}
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rc = -1;
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break;
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}
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return rc;
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}
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