![Cornelia Huck](/assets/img/avatar_default.png)
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1190 lines
26 KiB
C
1190 lines
26 KiB
C
/*
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* drivers/s390/cio/chsc.c
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* S/390 common I/O routines -- channel subsystem call
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* $Revision: 1.128 $
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*
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* Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
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* IBM Corporation
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* Author(s): Ingo Adlung (adlung@de.ibm.com)
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* Cornelia Huck (cornelia.huck@de.ibm.com)
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* Arnd Bergmann (arndb@de.ibm.com)
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*/
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#include <linux/module.h>
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#include <linux/config.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <asm/cio.h>
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#include "css.h"
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#include "cio.h"
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#include "cio_debug.h"
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#include "ioasm.h"
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#include "chsc.h"
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static void *sei_page;
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static int new_channel_path(int chpid);
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static inline void
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set_chp_logically_online(int chp, int onoff)
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{
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css[0]->chps[chp]->state = onoff;
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}
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static int
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get_chp_status(int chp)
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{
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return (css[0]->chps[chp] ? css[0]->chps[chp]->state : -ENODEV);
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}
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void
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chsc_validate_chpids(struct subchannel *sch)
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{
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int mask, chp;
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for (chp = 0; chp <= 7; chp++) {
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mask = 0x80 >> chp;
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if (!get_chp_status(sch->schib.pmcw.chpid[chp]))
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/* disable using this path */
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sch->opm &= ~mask;
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}
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}
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void
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chpid_is_actually_online(int chp)
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{
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int state;
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state = get_chp_status(chp);
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if (state < 0) {
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need_rescan = 1;
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queue_work(slow_path_wq, &slow_path_work);
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} else
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WARN_ON(!state);
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}
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/* FIXME: this is _always_ called for every subchannel. shouldn't we
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* process more than one at a time? */
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static int
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chsc_get_sch_desc_irq(struct subchannel *sch, void *page)
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{
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int ccode, j;
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struct {
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struct chsc_header request;
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u16 reserved1a:10;
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u16 ssid:2;
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u16 reserved1b:4;
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u16 f_sch; /* first subchannel */
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u16 reserved2;
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u16 l_sch; /* last subchannel */
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u32 reserved3;
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struct chsc_header response;
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u32 reserved4;
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u8 sch_valid : 1;
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u8 dev_valid : 1;
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u8 st : 3; /* subchannel type */
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u8 zeroes : 3;
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u8 unit_addr; /* unit address */
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u16 devno; /* device number */
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u8 path_mask;
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u8 fla_valid_mask;
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u16 sch; /* subchannel */
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u8 chpid[8]; /* chpids 0-7 */
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u16 fla[8]; /* full link addresses 0-7 */
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} *ssd_area;
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ssd_area = page;
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ssd_area->request = (struct chsc_header) {
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.length = 0x0010,
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.code = 0x0004,
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};
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ssd_area->ssid = sch->schid.ssid;
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ssd_area->f_sch = sch->schid.sch_no;
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ssd_area->l_sch = sch->schid.sch_no;
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ccode = chsc(ssd_area);
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if (ccode > 0) {
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pr_debug("chsc returned with ccode = %d\n", ccode);
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return (ccode == 3) ? -ENODEV : -EBUSY;
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}
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switch (ssd_area->response.code) {
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case 0x0001: /* everything ok */
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break;
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case 0x0002:
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CIO_CRW_EVENT(2, "Invalid command!\n");
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return -EINVAL;
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case 0x0003:
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CIO_CRW_EVENT(2, "Error in chsc request block!\n");
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return -EINVAL;
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case 0x0004:
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CIO_CRW_EVENT(2, "Model does not provide ssd\n");
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return -EOPNOTSUPP;
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default:
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CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
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ssd_area->response.code);
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return -EIO;
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}
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/*
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* ssd_area->st stores the type of the detected
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* subchannel, with the following definitions:
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*
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* 0: I/O subchannel: All fields have meaning
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* 1: CHSC subchannel: Only sch_val, st and sch
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* have meaning
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* 2: Message subchannel: All fields except unit_addr
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* have meaning
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* 3: ADM subchannel: Only sch_val, st and sch
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* have meaning
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*
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* Other types are currently undefined.
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*/
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if (ssd_area->st > 3) { /* uhm, that looks strange... */
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CIO_CRW_EVENT(0, "Strange subchannel type %d"
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" for sch 0.%x.%04x\n", ssd_area->st,
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sch->schid.ssid, sch->schid.sch_no);
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/*
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* There may have been a new subchannel type defined in the
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* time since this code was written; since we don't know which
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* fields have meaning and what to do with it we just jump out
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*/
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return 0;
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} else {
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const char *type[4] = {"I/O", "chsc", "message", "ADM"};
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CIO_CRW_EVENT(6, "ssd: sch 0.%x.%04x is %s subchannel\n",
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sch->schid.ssid, sch->schid.sch_no,
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type[ssd_area->st]);
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sch->ssd_info.valid = 1;
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sch->ssd_info.type = ssd_area->st;
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}
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if (ssd_area->st == 0 || ssd_area->st == 2) {
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for (j = 0; j < 8; j++) {
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if (!((0x80 >> j) & ssd_area->path_mask &
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ssd_area->fla_valid_mask))
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continue;
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sch->ssd_info.chpid[j] = ssd_area->chpid[j];
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sch->ssd_info.fla[j] = ssd_area->fla[j];
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}
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}
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return 0;
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}
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int
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css_get_ssd_info(struct subchannel *sch)
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{
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int ret;
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void *page;
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page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
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if (!page)
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return -ENOMEM;
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spin_lock_irq(&sch->lock);
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ret = chsc_get_sch_desc_irq(sch, page);
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if (ret) {
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static int cio_chsc_err_msg;
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if (!cio_chsc_err_msg) {
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printk(KERN_ERR
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"chsc_get_sch_descriptions:"
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" Error %d while doing chsc; "
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"processing some machine checks may "
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"not work\n", ret);
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cio_chsc_err_msg = 1;
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}
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}
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spin_unlock_irq(&sch->lock);
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free_page((unsigned long)page);
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if (!ret) {
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int j, chpid;
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/* Allocate channel path structures, if needed. */
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for (j = 0; j < 8; j++) {
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chpid = sch->ssd_info.chpid[j];
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if (chpid && (get_chp_status(chpid) < 0))
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new_channel_path(chpid);
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}
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}
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return ret;
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}
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static int
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s390_subchannel_remove_chpid(struct device *dev, void *data)
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{
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int j;
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int mask;
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struct subchannel *sch;
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struct channel_path *chpid;
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struct schib schib;
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sch = to_subchannel(dev);
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chpid = data;
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for (j = 0; j < 8; j++)
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if (sch->schib.pmcw.chpid[j] == chpid->id)
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break;
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if (j >= 8)
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return 0;
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mask = 0x80 >> j;
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spin_lock(&sch->lock);
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stsch(sch->schid, &schib);
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if (!schib.pmcw.dnv)
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goto out_unreg;
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memcpy(&sch->schib, &schib, sizeof(struct schib));
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/* Check for single path devices. */
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if (sch->schib.pmcw.pim == 0x80)
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goto out_unreg;
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if (sch->vpm == mask)
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goto out_unreg;
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if ((sch->schib.scsw.actl & (SCSW_ACTL_CLEAR_PEND |
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SCSW_ACTL_HALT_PEND |
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SCSW_ACTL_START_PEND |
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SCSW_ACTL_RESUME_PEND)) &&
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(sch->schib.pmcw.lpum == mask)) {
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int cc = cio_cancel(sch);
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if (cc == -ENODEV)
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goto out_unreg;
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if (cc == -EINVAL) {
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cc = cio_clear(sch);
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if (cc == -ENODEV)
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goto out_unreg;
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/* Call handler. */
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if (sch->driver && sch->driver->termination)
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sch->driver->termination(&sch->dev);
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goto out_unlock;
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}
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} else if ((sch->schib.scsw.actl & SCSW_ACTL_DEVACT) &&
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(sch->schib.scsw.actl & SCSW_ACTL_SCHACT) &&
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(sch->schib.pmcw.lpum == mask)) {
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int cc;
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cc = cio_clear(sch);
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if (cc == -ENODEV)
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goto out_unreg;
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/* Call handler. */
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if (sch->driver && sch->driver->termination)
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sch->driver->termination(&sch->dev);
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goto out_unlock;
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}
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/* trigger path verification. */
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if (sch->driver && sch->driver->verify)
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sch->driver->verify(&sch->dev);
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out_unlock:
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spin_unlock(&sch->lock);
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return 0;
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out_unreg:
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spin_unlock(&sch->lock);
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sch->lpm = 0;
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if (css_enqueue_subchannel_slow(sch->schid)) {
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css_clear_subchannel_slow_list();
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need_rescan = 1;
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}
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return 0;
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}
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static inline void
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s390_set_chpid_offline( __u8 chpid)
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{
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char dbf_txt[15];
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struct device *dev;
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sprintf(dbf_txt, "chpr%x", chpid);
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CIO_TRACE_EVENT(2, dbf_txt);
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if (get_chp_status(chpid) <= 0)
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return;
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dev = get_device(&css[0]->chps[chpid]->dev);
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bus_for_each_dev(&css_bus_type, NULL, to_channelpath(dev),
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s390_subchannel_remove_chpid);
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if (need_rescan || css_slow_subchannels_exist())
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queue_work(slow_path_wq, &slow_path_work);
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put_device(dev);
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}
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struct res_acc_data {
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struct channel_path *chp;
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u32 fla_mask;
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u16 fla;
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};
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static int
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s390_process_res_acc_sch(struct res_acc_data *res_data, struct subchannel *sch)
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{
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int found;
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int chp;
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int ccode;
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found = 0;
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for (chp = 0; chp <= 7; chp++)
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/*
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* check if chpid is in information updated by ssd
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*/
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if (sch->ssd_info.valid &&
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sch->ssd_info.chpid[chp] == res_data->chp->id &&
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(sch->ssd_info.fla[chp] & res_data->fla_mask)
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== res_data->fla) {
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found = 1;
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break;
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}
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if (found == 0)
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return 0;
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/*
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* Do a stsch to update our subchannel structure with the
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* new path information and eventually check for logically
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* offline chpids.
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*/
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ccode = stsch(sch->schid, &sch->schib);
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if (ccode > 0)
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return 0;
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return 0x80 >> chp;
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}
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static inline int
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s390_process_res_acc_new_sch(struct subchannel_id schid)
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{
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struct schib schib;
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int ret;
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/*
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* We don't know the device yet, but since a path
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* may be available now to the device we'll have
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* to do recognition again.
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* Since we don't have any idea about which chpid
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* that beast may be on we'll have to do a stsch
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* on all devices, grr...
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*/
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if (stsch_err(schid, &schib))
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/* We're through */
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return need_rescan ? -EAGAIN : -ENXIO;
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/* Put it on the slow path. */
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ret = css_enqueue_subchannel_slow(schid);
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if (ret) {
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css_clear_subchannel_slow_list();
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need_rescan = 1;
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return -EAGAIN;
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}
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return 0;
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}
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static int
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__s390_process_res_acc(struct subchannel_id schid, void *data)
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{
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int chp_mask, old_lpm;
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struct res_acc_data *res_data;
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struct subchannel *sch;
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res_data = (struct res_acc_data *)data;
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sch = get_subchannel_by_schid(schid);
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if (!sch)
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/* Check if a subchannel is newly available. */
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return s390_process_res_acc_new_sch(schid);
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spin_lock_irq(&sch->lock);
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chp_mask = s390_process_res_acc_sch(res_data, sch);
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if (chp_mask == 0) {
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spin_unlock_irq(&sch->lock);
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return 0;
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}
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old_lpm = sch->lpm;
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sch->lpm = ((sch->schib.pmcw.pim &
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sch->schib.pmcw.pam &
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sch->schib.pmcw.pom)
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| chp_mask) & sch->opm;
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if (!old_lpm && sch->lpm)
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device_trigger_reprobe(sch);
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else if (sch->driver && sch->driver->verify)
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sch->driver->verify(&sch->dev);
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spin_unlock_irq(&sch->lock);
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put_device(&sch->dev);
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return (res_data->fla_mask == 0xffff) ? -ENODEV : 0;
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}
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static int
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s390_process_res_acc (struct res_acc_data *res_data)
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{
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int rc;
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char dbf_txt[15];
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sprintf(dbf_txt, "accpr%x", res_data->chp->id);
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CIO_TRACE_EVENT( 2, dbf_txt);
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if (res_data->fla != 0) {
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sprintf(dbf_txt, "fla%x", res_data->fla);
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CIO_TRACE_EVENT( 2, dbf_txt);
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}
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/*
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* I/O resources may have become accessible.
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* Scan through all subchannels that may be concerned and
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* do a validation on those.
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* The more information we have (info), the less scanning
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* will we have to do.
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*/
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rc = for_each_subchannel(__s390_process_res_acc, res_data);
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if (css_slow_subchannels_exist())
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rc = -EAGAIN;
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else if (rc != -EAGAIN)
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rc = 0;
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return rc;
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}
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|
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static int
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__get_chpid_from_lir(void *data)
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{
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struct lir {
|
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u8 iq;
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u8 ic;
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u16 sci;
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/* incident-node descriptor */
|
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u32 indesc[28];
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/* attached-node descriptor */
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u32 andesc[28];
|
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/* incident-specific information */
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u32 isinfo[28];
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} *lir;
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lir = (struct lir*) data;
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if (!(lir->iq&0x80))
|
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/* NULL link incident record */
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return -EINVAL;
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if (!(lir->indesc[0]&0xc0000000))
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/* node descriptor not valid */
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return -EINVAL;
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if (!(lir->indesc[0]&0x10000000))
|
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/* don't handle device-type nodes - FIXME */
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return -EINVAL;
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/* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
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|
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return (u16) (lir->indesc[0]&0x000000ff);
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}
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|
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int
|
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chsc_process_crw(void)
|
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{
|
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int chpid, ret;
|
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struct res_acc_data res_data;
|
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struct {
|
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struct chsc_header request;
|
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u32 reserved1;
|
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u32 reserved2;
|
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u32 reserved3;
|
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struct chsc_header response;
|
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u32 reserved4;
|
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u8 flags;
|
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u8 vf; /* validity flags */
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u8 rs; /* reporting source */
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u8 cc; /* content code */
|
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u16 fla; /* full link address */
|
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u16 rsid; /* reporting source id */
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u32 reserved5;
|
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u32 reserved6;
|
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u32 ccdf[96]; /* content-code dependent field */
|
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/* ccdf has to be big enough for a link-incident record */
|
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} *sei_area;
|
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|
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if (!sei_page)
|
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return 0;
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/*
|
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* build the chsc request block for store event information
|
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* and do the call
|
|
* This function is only called by the machine check handler thread,
|
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* so we don't need locking for the sei_page.
|
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*/
|
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sei_area = sei_page;
|
|
|
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CIO_TRACE_EVENT( 2, "prcss");
|
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ret = 0;
|
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do {
|
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int ccode, status;
|
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struct device *dev;
|
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memset(sei_area, 0, sizeof(*sei_area));
|
|
memset(&res_data, 0, sizeof(struct res_acc_data));
|
|
sei_area->request = (struct chsc_header) {
|
|
.length = 0x0010,
|
|
.code = 0x000e,
|
|
};
|
|
|
|
ccode = chsc(sei_area);
|
|
if (ccode > 0)
|
|
return 0;
|
|
|
|
switch (sei_area->response.code) {
|
|
/* for debug purposes, check for problems */
|
|
case 0x0001:
|
|
CIO_CRW_EVENT(4, "chsc_process_crw: event information "
|
|
"successfully stored\n");
|
|
break; /* everything ok */
|
|
case 0x0002:
|
|
CIO_CRW_EVENT(2,
|
|
"chsc_process_crw: invalid command!\n");
|
|
return 0;
|
|
case 0x0003:
|
|
CIO_CRW_EVENT(2, "chsc_process_crw: error in chsc "
|
|
"request block!\n");
|
|
return 0;
|
|
case 0x0005:
|
|
CIO_CRW_EVENT(2, "chsc_process_crw: no event "
|
|
"information stored\n");
|
|
return 0;
|
|
default:
|
|
CIO_CRW_EVENT(2, "chsc_process_crw: chsc response %d\n",
|
|
sei_area->response.code);
|
|
return 0;
|
|
}
|
|
|
|
/* Check if we might have lost some information. */
|
|
if (sei_area->flags & 0x40)
|
|
CIO_CRW_EVENT(2, "chsc_process_crw: Event information "
|
|
"has been lost due to overflow!\n");
|
|
|
|
if (sei_area->rs != 4) {
|
|
CIO_CRW_EVENT(2, "chsc_process_crw: reporting source "
|
|
"(%04X) isn't a chpid!\n",
|
|
sei_area->rsid);
|
|
continue;
|
|
}
|
|
|
|
/* which kind of information was stored? */
|
|
switch (sei_area->cc) {
|
|
case 1: /* link incident*/
|
|
CIO_CRW_EVENT(4, "chsc_process_crw: "
|
|
"channel subsystem reports link incident,"
|
|
" reporting source is chpid %x\n",
|
|
sei_area->rsid);
|
|
chpid = __get_chpid_from_lir(sei_area->ccdf);
|
|
if (chpid < 0)
|
|
CIO_CRW_EVENT(4, "%s: Invalid LIR, skipping\n",
|
|
__FUNCTION__);
|
|
else
|
|
s390_set_chpid_offline(chpid);
|
|
break;
|
|
|
|
case 2: /* i/o resource accessibiliy */
|
|
CIO_CRW_EVENT(4, "chsc_process_crw: "
|
|
"channel subsystem reports some I/O "
|
|
"devices may have become accessible\n");
|
|
pr_debug("Data received after sei: \n");
|
|
pr_debug("Validity flags: %x\n", sei_area->vf);
|
|
|
|
/* allocate a new channel path structure, if needed */
|
|
status = get_chp_status(sei_area->rsid);
|
|
if (status < 0)
|
|
new_channel_path(sei_area->rsid);
|
|
else if (!status)
|
|
break;
|
|
dev = get_device(&css[0]->chps[sei_area->rsid]->dev);
|
|
res_data.chp = to_channelpath(dev);
|
|
pr_debug("chpid: %x", sei_area->rsid);
|
|
if ((sei_area->vf & 0xc0) != 0) {
|
|
res_data.fla = sei_area->fla;
|
|
if ((sei_area->vf & 0xc0) == 0xc0) {
|
|
pr_debug(" full link addr: %x",
|
|
sei_area->fla);
|
|
res_data.fla_mask = 0xffff;
|
|
} else {
|
|
pr_debug(" link addr: %x",
|
|
sei_area->fla);
|
|
res_data.fla_mask = 0xff00;
|
|
}
|
|
}
|
|
ret = s390_process_res_acc(&res_data);
|
|
pr_debug("\n\n");
|
|
put_device(dev);
|
|
break;
|
|
|
|
default: /* other stuff */
|
|
CIO_CRW_EVENT(4, "chsc_process_crw: event %d\n",
|
|
sei_area->cc);
|
|
break;
|
|
}
|
|
} while (sei_area->flags & 0x80);
|
|
return ret;
|
|
}
|
|
|
|
static inline int
|
|
__chp_add_new_sch(struct subchannel_id schid)
|
|
{
|
|
struct schib schib;
|
|
int ret;
|
|
|
|
if (stsch(schid, &schib))
|
|
/* We're through */
|
|
return need_rescan ? -EAGAIN : -ENXIO;
|
|
|
|
/* Put it on the slow path. */
|
|
ret = css_enqueue_subchannel_slow(schid);
|
|
if (ret) {
|
|
css_clear_subchannel_slow_list();
|
|
need_rescan = 1;
|
|
return -EAGAIN;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int
|
|
__chp_add(struct subchannel_id schid, void *data)
|
|
{
|
|
int i;
|
|
struct channel_path *chp;
|
|
struct subchannel *sch;
|
|
|
|
chp = (struct channel_path *)data;
|
|
sch = get_subchannel_by_schid(schid);
|
|
if (!sch)
|
|
/* Check if the subchannel is now available. */
|
|
return __chp_add_new_sch(schid);
|
|
spin_lock(&sch->lock);
|
|
for (i=0; i<8; i++)
|
|
if (sch->schib.pmcw.chpid[i] == chp->id) {
|
|
if (stsch(sch->schid, &sch->schib) != 0) {
|
|
/* Endgame. */
|
|
spin_unlock(&sch->lock);
|
|
return -ENXIO;
|
|
}
|
|
break;
|
|
}
|
|
if (i==8) {
|
|
spin_unlock(&sch->lock);
|
|
return 0;
|
|
}
|
|
sch->lpm = ((sch->schib.pmcw.pim &
|
|
sch->schib.pmcw.pam &
|
|
sch->schib.pmcw.pom)
|
|
| 0x80 >> i) & sch->opm;
|
|
|
|
if (sch->driver && sch->driver->verify)
|
|
sch->driver->verify(&sch->dev);
|
|
|
|
spin_unlock(&sch->lock);
|
|
put_device(&sch->dev);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
chp_add(int chpid)
|
|
{
|
|
int rc;
|
|
char dbf_txt[15];
|
|
struct device *dev;
|
|
|
|
if (!get_chp_status(chpid))
|
|
return 0; /* no need to do the rest */
|
|
|
|
sprintf(dbf_txt, "cadd%x", chpid);
|
|
CIO_TRACE_EVENT(2, dbf_txt);
|
|
|
|
dev = get_device(&css[0]->chps[chpid]->dev);
|
|
rc = for_each_subchannel(__chp_add, to_channelpath(dev));
|
|
if (css_slow_subchannels_exist())
|
|
rc = -EAGAIN;
|
|
if (rc != -EAGAIN)
|
|
rc = 0;
|
|
put_device(dev);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Handling of crw machine checks with channel path source.
|
|
*/
|
|
int
|
|
chp_process_crw(int chpid, int on)
|
|
{
|
|
if (on == 0) {
|
|
/* Path has gone. We use the link incident routine.*/
|
|
s390_set_chpid_offline(chpid);
|
|
return 0; /* De-register is async anyway. */
|
|
}
|
|
/*
|
|
* Path has come. Allocate a new channel path structure,
|
|
* if needed.
|
|
*/
|
|
if (get_chp_status(chpid) < 0)
|
|
new_channel_path(chpid);
|
|
/* Avoid the extra overhead in process_rec_acc. */
|
|
return chp_add(chpid);
|
|
}
|
|
|
|
static inline int
|
|
__check_for_io_and_kill(struct subchannel *sch, int index)
|
|
{
|
|
int cc;
|
|
|
|
if (!device_is_online(sch))
|
|
/* cio could be doing I/O. */
|
|
return 0;
|
|
cc = stsch(sch->schid, &sch->schib);
|
|
if (cc)
|
|
return 0;
|
|
if (sch->schib.scsw.actl && sch->schib.pmcw.lpum == (0x80 >> index)) {
|
|
device_set_waiting(sch);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline void
|
|
__s390_subchannel_vary_chpid(struct subchannel *sch, __u8 chpid, int on)
|
|
{
|
|
int chp, old_lpm;
|
|
unsigned long flags;
|
|
|
|
if (!sch->ssd_info.valid)
|
|
return;
|
|
|
|
spin_lock_irqsave(&sch->lock, flags);
|
|
old_lpm = sch->lpm;
|
|
for (chp = 0; chp < 8; chp++) {
|
|
if (sch->ssd_info.chpid[chp] != chpid)
|
|
continue;
|
|
|
|
if (on) {
|
|
sch->opm |= (0x80 >> chp);
|
|
sch->lpm |= (0x80 >> chp);
|
|
if (!old_lpm)
|
|
device_trigger_reprobe(sch);
|
|
else if (sch->driver && sch->driver->verify)
|
|
sch->driver->verify(&sch->dev);
|
|
} else {
|
|
sch->opm &= ~(0x80 >> chp);
|
|
sch->lpm &= ~(0x80 >> chp);
|
|
/*
|
|
* Give running I/O a grace period in which it
|
|
* can successfully terminate, even using the
|
|
* just varied off path. Then kill it.
|
|
*/
|
|
if (!__check_for_io_and_kill(sch, chp) && !sch->lpm) {
|
|
if (css_enqueue_subchannel_slow(sch->schid)) {
|
|
css_clear_subchannel_slow_list();
|
|
need_rescan = 1;
|
|
}
|
|
} else if (sch->driver && sch->driver->verify)
|
|
sch->driver->verify(&sch->dev);
|
|
}
|
|
break;
|
|
}
|
|
spin_unlock_irqrestore(&sch->lock, flags);
|
|
}
|
|
|
|
static int
|
|
s390_subchannel_vary_chpid_off(struct device *dev, void *data)
|
|
{
|
|
struct subchannel *sch;
|
|
__u8 *chpid;
|
|
|
|
sch = to_subchannel(dev);
|
|
chpid = data;
|
|
|
|
__s390_subchannel_vary_chpid(sch, *chpid, 0);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
s390_subchannel_vary_chpid_on(struct device *dev, void *data)
|
|
{
|
|
struct subchannel *sch;
|
|
__u8 *chpid;
|
|
|
|
sch = to_subchannel(dev);
|
|
chpid = data;
|
|
|
|
__s390_subchannel_vary_chpid(sch, *chpid, 1);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
__s390_vary_chpid_on(struct subchannel_id schid, void *data)
|
|
{
|
|
struct schib schib;
|
|
struct subchannel *sch;
|
|
|
|
sch = get_subchannel_by_schid(schid);
|
|
if (sch) {
|
|
put_device(&sch->dev);
|
|
return 0;
|
|
}
|
|
if (stsch_err(schid, &schib))
|
|
/* We're through */
|
|
return -ENXIO;
|
|
/* Put it on the slow path. */
|
|
if (css_enqueue_subchannel_slow(schid)) {
|
|
css_clear_subchannel_slow_list();
|
|
need_rescan = 1;
|
|
return -EAGAIN;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Function: s390_vary_chpid
|
|
* Varies the specified chpid online or offline
|
|
*/
|
|
static int
|
|
s390_vary_chpid( __u8 chpid, int on)
|
|
{
|
|
char dbf_text[15];
|
|
int status;
|
|
|
|
sprintf(dbf_text, on?"varyon%x":"varyoff%x", chpid);
|
|
CIO_TRACE_EVENT( 2, dbf_text);
|
|
|
|
status = get_chp_status(chpid);
|
|
if (status < 0) {
|
|
printk(KERN_ERR "Can't vary unknown chpid %02X\n", chpid);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!on && !status) {
|
|
printk(KERN_ERR "chpid %x is already offline\n", chpid);
|
|
return -EINVAL;
|
|
}
|
|
|
|
set_chp_logically_online(chpid, on);
|
|
|
|
/*
|
|
* Redo PathVerification on the devices the chpid connects to
|
|
*/
|
|
|
|
bus_for_each_dev(&css_bus_type, NULL, &chpid, on ?
|
|
s390_subchannel_vary_chpid_on :
|
|
s390_subchannel_vary_chpid_off);
|
|
if (on)
|
|
/* Scan for new devices on varied on path. */
|
|
for_each_subchannel(__s390_vary_chpid_on, NULL);
|
|
if (need_rescan || css_slow_subchannels_exist())
|
|
queue_work(slow_path_wq, &slow_path_work);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Files for the channel path entries.
|
|
*/
|
|
static ssize_t
|
|
chp_status_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct channel_path *chp = container_of(dev, struct channel_path, dev);
|
|
|
|
if (!chp)
|
|
return 0;
|
|
return (get_chp_status(chp->id) ? sprintf(buf, "online\n") :
|
|
sprintf(buf, "offline\n"));
|
|
}
|
|
|
|
static ssize_t
|
|
chp_status_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct channel_path *cp = container_of(dev, struct channel_path, dev);
|
|
char cmd[10];
|
|
int num_args;
|
|
int error;
|
|
|
|
num_args = sscanf(buf, "%5s", cmd);
|
|
if (!num_args)
|
|
return count;
|
|
|
|
if (!strnicmp(cmd, "on", 2))
|
|
error = s390_vary_chpid(cp->id, 1);
|
|
else if (!strnicmp(cmd, "off", 3))
|
|
error = s390_vary_chpid(cp->id, 0);
|
|
else
|
|
error = -EINVAL;
|
|
|
|
return error < 0 ? error : count;
|
|
|
|
}
|
|
|
|
static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write);
|
|
|
|
static ssize_t
|
|
chp_type_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct channel_path *chp = container_of(dev, struct channel_path, dev);
|
|
|
|
if (!chp)
|
|
return 0;
|
|
return sprintf(buf, "%x\n", chp->desc.desc);
|
|
}
|
|
|
|
static DEVICE_ATTR(type, 0444, chp_type_show, NULL);
|
|
|
|
static struct attribute * chp_attrs[] = {
|
|
&dev_attr_status.attr,
|
|
&dev_attr_type.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group chp_attr_group = {
|
|
.attrs = chp_attrs,
|
|
};
|
|
|
|
static void
|
|
chp_release(struct device *dev)
|
|
{
|
|
struct channel_path *cp;
|
|
|
|
cp = container_of(dev, struct channel_path, dev);
|
|
kfree(cp);
|
|
}
|
|
|
|
static int
|
|
chsc_determine_channel_path_description(int chpid,
|
|
struct channel_path_desc *desc)
|
|
{
|
|
int ccode, ret;
|
|
|
|
struct {
|
|
struct chsc_header request;
|
|
u32 : 24;
|
|
u32 first_chpid : 8;
|
|
u32 : 24;
|
|
u32 last_chpid : 8;
|
|
u32 zeroes1;
|
|
struct chsc_header response;
|
|
u32 zeroes2;
|
|
struct channel_path_desc desc;
|
|
} *scpd_area;
|
|
|
|
scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
|
|
if (!scpd_area)
|
|
return -ENOMEM;
|
|
|
|
scpd_area->request = (struct chsc_header) {
|
|
.length = 0x0010,
|
|
.code = 0x0002,
|
|
};
|
|
|
|
scpd_area->first_chpid = chpid;
|
|
scpd_area->last_chpid = chpid;
|
|
|
|
ccode = chsc(scpd_area);
|
|
if (ccode > 0) {
|
|
ret = (ccode == 3) ? -ENODEV : -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
switch (scpd_area->response.code) {
|
|
case 0x0001: /* Success. */
|
|
memcpy(desc, &scpd_area->desc,
|
|
sizeof(struct channel_path_desc));
|
|
ret = 0;
|
|
break;
|
|
case 0x0003: /* Invalid block. */
|
|
case 0x0007: /* Invalid format. */
|
|
case 0x0008: /* Other invalid block. */
|
|
CIO_CRW_EVENT(2, "Error in chsc request block!\n");
|
|
ret = -EINVAL;
|
|
break;
|
|
case 0x0004: /* Command not provided in model. */
|
|
CIO_CRW_EVENT(2, "Model does not provide scpd\n");
|
|
ret = -EOPNOTSUPP;
|
|
break;
|
|
default:
|
|
CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
|
|
scpd_area->response.code);
|
|
ret = -EIO;
|
|
}
|
|
out:
|
|
free_page((unsigned long)scpd_area);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Entries for chpids on the system bus.
|
|
* This replaces /proc/chpids.
|
|
*/
|
|
static int
|
|
new_channel_path(int chpid)
|
|
{
|
|
struct channel_path *chp;
|
|
int ret;
|
|
|
|
chp = kmalloc(sizeof(struct channel_path), GFP_KERNEL);
|
|
if (!chp)
|
|
return -ENOMEM;
|
|
memset(chp, 0, sizeof(struct channel_path));
|
|
|
|
/* fill in status, etc. */
|
|
chp->id = chpid;
|
|
chp->state = 1;
|
|
chp->dev = (struct device) {
|
|
.parent = &css[0]->device,
|
|
.release = chp_release,
|
|
};
|
|
snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp0.%x", chpid);
|
|
|
|
/* Obtain channel path description and fill it in. */
|
|
ret = chsc_determine_channel_path_description(chpid, &chp->desc);
|
|
if (ret)
|
|
goto out_free;
|
|
|
|
/* make it known to the system */
|
|
ret = device_register(&chp->dev);
|
|
if (ret) {
|
|
printk(KERN_WARNING "%s: could not register %02x\n",
|
|
__func__, chpid);
|
|
goto out_free;
|
|
}
|
|
ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group);
|
|
if (ret) {
|
|
device_unregister(&chp->dev);
|
|
goto out_free;
|
|
} else
|
|
css[0]->chps[chpid] = chp;
|
|
return ret;
|
|
out_free:
|
|
kfree(chp);
|
|
return ret;
|
|
}
|
|
|
|
void *
|
|
chsc_get_chp_desc(struct subchannel *sch, int chp_no)
|
|
{
|
|
struct channel_path *chp;
|
|
struct channel_path_desc *desc;
|
|
|
|
chp = css[0]->chps[sch->schib.pmcw.chpid[chp_no]];
|
|
if (!chp)
|
|
return NULL;
|
|
desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL);
|
|
if (!desc)
|
|
return NULL;
|
|
memcpy(desc, &chp->desc, sizeof(struct channel_path_desc));
|
|
return desc;
|
|
}
|
|
|
|
|
|
static int __init
|
|
chsc_alloc_sei_area(void)
|
|
{
|
|
sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
|
|
if (!sei_page)
|
|
printk(KERN_WARNING"Can't allocate page for processing of " \
|
|
"chsc machine checks!\n");
|
|
return (sei_page ? 0 : -ENOMEM);
|
|
}
|
|
|
|
int __init
|
|
chsc_enable_facility(int operation_code)
|
|
{
|
|
int ret;
|
|
struct {
|
|
struct chsc_header request;
|
|
u8 reserved1:4;
|
|
u8 format:4;
|
|
u8 reserved2;
|
|
u16 operation_code;
|
|
u32 reserved3;
|
|
u32 reserved4;
|
|
u32 operation_data_area[252];
|
|
struct chsc_header response;
|
|
u32 reserved5:4;
|
|
u32 format2:4;
|
|
u32 reserved6:24;
|
|
} *sda_area;
|
|
|
|
sda_area = (void *)get_zeroed_page(GFP_KERNEL|GFP_DMA);
|
|
if (!sda_area)
|
|
return -ENOMEM;
|
|
sda_area->request = (struct chsc_header) {
|
|
.length = 0x0400,
|
|
.code = 0x0031,
|
|
};
|
|
sda_area->operation_code = operation_code;
|
|
|
|
ret = chsc(sda_area);
|
|
if (ret > 0) {
|
|
ret = (ret == 3) ? -ENODEV : -EBUSY;
|
|
goto out;
|
|
}
|
|
switch (sda_area->response.code) {
|
|
case 0x0003: /* invalid request block */
|
|
case 0x0007:
|
|
ret = -EINVAL;
|
|
break;
|
|
case 0x0004: /* command not provided */
|
|
case 0x0101: /* facility not provided */
|
|
ret = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
out:
|
|
free_page((unsigned long)sda_area);
|
|
return ret;
|
|
}
|
|
|
|
subsys_initcall(chsc_alloc_sei_area);
|
|
|
|
struct css_general_char css_general_characteristics;
|
|
struct css_chsc_char css_chsc_characteristics;
|
|
|
|
int __init
|
|
chsc_determine_css_characteristics(void)
|
|
{
|
|
int result;
|
|
struct {
|
|
struct chsc_header request;
|
|
u32 reserved1;
|
|
u32 reserved2;
|
|
u32 reserved3;
|
|
struct chsc_header response;
|
|
u32 reserved4;
|
|
u32 general_char[510];
|
|
u32 chsc_char[518];
|
|
} *scsc_area;
|
|
|
|
scsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
|
|
if (!scsc_area) {
|
|
printk(KERN_WARNING"cio: Was not able to determine available" \
|
|
"CHSCs due to no memory.\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
scsc_area->request = (struct chsc_header) {
|
|
.length = 0x0010,
|
|
.code = 0x0010,
|
|
};
|
|
|
|
result = chsc(scsc_area);
|
|
if (result) {
|
|
printk(KERN_WARNING"cio: Was not able to determine " \
|
|
"available CHSCs, cc=%i.\n", result);
|
|
result = -EIO;
|
|
goto exit;
|
|
}
|
|
|
|
if (scsc_area->response.code != 1) {
|
|
printk(KERN_WARNING"cio: Was not able to determine " \
|
|
"available CHSCs.\n");
|
|
result = -EIO;
|
|
goto exit;
|
|
}
|
|
memcpy(&css_general_characteristics, scsc_area->general_char,
|
|
sizeof(css_general_characteristics));
|
|
memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
|
|
sizeof(css_chsc_characteristics));
|
|
exit:
|
|
free_page ((unsigned long) scsc_area);
|
|
return result;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(css_general_characteristics);
|
|
EXPORT_SYMBOL_GPL(css_chsc_characteristics);
|