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[S390] cio: fix subchannel channel-path data usage
Ensure that channel-path related subchannel data is only retrieved and used when it is valid and that it is updated when it may have changed. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Peter Oberparleiter
Martin Schwidefsky
parent
83b3370c79
commit
7ad6a24970
@ -26,155 +26,84 @@
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static void *sei_page;
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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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} __attribute__ ((packed)) *ssd_area;
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ssd_area = page;
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ssd_area->request.length = 0x0010;
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ssd_area->request.code = 0x0004;
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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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struct chsc_ssd_area {
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struct chsc_header request;
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u16 :10;
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u16 ssid:2;
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u16 :4;
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u16 f_sch; /* first subchannel */
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u16 :16;
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u16 l_sch; /* last subchannel */
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u32 :32;
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struct chsc_header response;
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u32 :32;
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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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} __attribute__ ((packed));
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int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
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{
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unsigned long page;
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struct chsc_ssd_area *ssd_area;
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int ccode;
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int ret;
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void *page;
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int i;
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int mask;
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page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
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page = 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, mask;
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struct chp_id chpid;
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ssd_area = (struct chsc_ssd_area *) page;
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ssd_area->request.length = 0x0010;
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ssd_area->request.code = 0x0004;
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ssd_area->ssid = schid.ssid;
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ssd_area->f_sch = schid.sch_no;
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ssd_area->l_sch = schid.sch_no;
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chp_id_init(&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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mask = 0x80 >> j;
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chpid.id = sch->ssd_info.chpid[j];
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if ((sch->schib.pmcw.pim & mask) &&
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!chp_is_registered(chpid))
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chp_new(chpid);
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}
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ccode = chsc(ssd_area);
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/* Check response. */
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if (ccode > 0) {
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ret = (ccode == 3) ? -ENODEV : -EBUSY;
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goto out_free;
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}
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if (ssd_area->response.code != 0x0001) {
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CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
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schid.ssid, schid.sch_no,
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ssd_area->response.code);
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ret = -EIO;
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goto out_free;
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}
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if (!ssd_area->sch_valid) {
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ret = -ENODEV;
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goto out_free;
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}
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/* Copy data */
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ret = 0;
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memset(ssd, 0, sizeof(struct chsc_ssd_info));
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if ((ssd_area->st != 0) && (ssd_area->st != 2))
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goto out_free;
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ssd->path_mask = ssd_area->path_mask;
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ssd->fla_valid_mask = ssd_area->fla_valid_mask;
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for (i = 0; i < 8; i++) {
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mask = 0x80 >> i;
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if (ssd_area->path_mask & mask) {
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chp_id_init(&ssd->chpid[i]);
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ssd->chpid[i].id = ssd_area->chpid[i];
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}
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if (ssd_area->fla_valid_mask & mask)
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ssd->fla[i] = ssd_area->fla[i];
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}
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out_free:
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free_page(page);
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return ret;
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}
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@ -276,47 +205,6 @@ void chsc_chp_offline(struct chp_id chpid)
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s390_subchannel_remove_chpid);
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}
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struct res_acc_data {
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struct chp_id chpid;
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u32 fla_mask;
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u16 fla;
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};
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static int s390_process_res_acc_sch(struct res_acc_data *res_data,
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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->chpid.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 int
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s390_process_res_acc_new_sch(struct subchannel_id schid)
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{
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@ -338,6 +226,32 @@ s390_process_res_acc_new_sch(struct subchannel_id schid)
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return 0;
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}
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struct res_acc_data {
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struct chp_id chpid;
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u32 fla_mask;
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u16 fla;
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};
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static int get_res_chpid_mask(struct chsc_ssd_info *ssd,
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struct res_acc_data *data)
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{
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int i;
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int mask;
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for (i = 0; i < 8; i++) {
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mask = 0x80 >> i;
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if (!(ssd->path_mask & mask))
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continue;
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if (!chp_id_is_equal(&ssd->chpid[i], &data->chpid))
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continue;
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if ((ssd->fla_valid_mask & mask) &&
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((ssd->fla[i] & data->fla_mask) != data->fla))
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continue;
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return mask;
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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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@ -352,14 +266,11 @@ __s390_process_res_acc(struct subchannel_id schid, void *data)
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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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put_device(&sch->dev);
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return 0;
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}
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chp_mask = get_res_chpid_mask(&sch->ssd_info, res_data);
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if (chp_mask == 0)
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goto out;
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if (stsch(sch->schid, &sch->schib))
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goto out;
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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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@ -369,13 +280,12 @@ __s390_process_res_acc(struct subchannel_id schid, void *data)
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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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out:
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spin_unlock_irq(sch->lock);
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put_device(&sch->dev);
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return 0;
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}
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static void s390_process_res_acc (struct res_acc_data *res_data)
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{
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char dbf_txt[15];
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@ -661,29 +571,30 @@ static void __s390_subchannel_vary_chpid(struct subchannel *sch,
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struct chp_id chpid, int on)
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{
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int chp, old_lpm;
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int mask;
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unsigned long flags;
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if (!sch->ssd_info.valid)
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return;
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spin_lock_irqsave(sch->lock, flags);
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old_lpm = sch->lpm;
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for (chp = 0; chp < 8; chp++) {
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if (sch->ssd_info.chpid[chp] != chpid.id)
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mask = 0x80 >> chp;
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if (!(sch->ssd_info.path_mask & mask))
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continue;
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if (!chp_id_is_equal(&sch->ssd_info.chpid[chp], &chpid))
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continue;
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if (on) {
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sch->opm |= (0x80 >> chp);
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sch->lpm |= (0x80 >> chp);
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sch->opm |= mask;
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sch->lpm |= mask;
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if (!old_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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break;
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}
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sch->opm &= ~(0x80 >> chp);
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sch->lpm &= ~(0x80 >> chp);
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if (check_for_io_on_path(sch, (0x80 >> chp))) {
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sch->opm &= ~mask;
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sch->lpm &= ~mask;
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if (check_for_io_on_path(sch, mask)) {
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if (device_is_online(sch))
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/* Path verification is done after killing. */
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device_kill_io(sch);
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@ -4,6 +4,7 @@
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#include <linux/types.h>
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#include <linux/device.h>
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#include <asm/chpid.h>
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#include "schid.h"
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#define CHSC_SDA_OC_MSS 0x2
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@ -35,7 +36,6 @@ struct channel_path_desc {
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struct channel_path;
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extern int css_get_ssd_info(struct subchannel *);
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extern void chsc_process_crw(void);
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struct css_general_char {
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@ -69,6 +69,14 @@ struct css_chsc_char {
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extern struct css_general_char css_general_characteristics;
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extern struct css_chsc_char css_chsc_characteristics;
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struct chsc_ssd_info {
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u8 path_mask;
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u8 fla_valid_mask;
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struct chp_id chpid[8];
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u16 fla[8];
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};
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extern int chsc_get_ssd_info(struct subchannel_id schid,
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struct chsc_ssd_info *ssd);
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extern int chsc_determine_css_characteristics(void);
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extern int css_characteristics_avail;
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@ -1,19 +1,11 @@
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#ifndef S390_CIO_H
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#define S390_CIO_H
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#include "schid.h"
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#include <linux/mutex.h>
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#include <linux/device.h>
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/*
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* where we put the ssd info
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*/
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struct ssd_info {
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__u8 valid:1;
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__u8 type:7; /* subchannel type */
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__u8 chpid[8]; /* chpids */
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__u16 fla[8]; /* full link addresses */
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} __attribute__ ((packed));
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#include <asm/chpid.h>
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#include "chsc.h"
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#include "schid.h"
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/*
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* path management control word
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@ -109,7 +101,7 @@ struct subchannel {
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struct schib schib; /* subchannel information block */
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struct orb orb; /* operation request block */
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struct ccw1 sense_ccw; /* static ccw for sense command */
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struct ssd_info ssd_info; /* subchannel description */
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struct chsc_ssd_info ssd_info; /* subchannel description */
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struct device dev; /* entry in device tree */
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struct css_driver *driver;
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} __attribute__ ((aligned(8)));
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@ -21,6 +21,7 @@
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#include "chsc.h"
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#include "device.h"
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#include "idset.h"
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#include "chp.h"
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int css_init_done = 0;
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static int need_reprobe = 0;
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@ -125,8 +126,52 @@ void css_sch_device_unregister(struct subchannel *sch)
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mutex_unlock(&sch->reg_mutex);
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}
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static int
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css_register_subchannel(struct subchannel *sch)
|
||||
static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw)
|
||||
{
|
||||
int i;
|
||||
int mask;
|
||||
|
||||
memset(ssd, 0, sizeof(struct chsc_ssd_info));
|
||||
ssd->path_mask = pmcw->pim;
|
||||
for (i = 0; i < 8; i++) {
|
||||
mask = 0x80 >> i;
|
||||
if (pmcw->pim & mask) {
|
||||
chp_id_init(&ssd->chpid[i]);
|
||||
ssd->chpid[i].id = pmcw->chpid[i];
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void ssd_register_chpids(struct chsc_ssd_info *ssd)
|
||||
{
|
||||
int i;
|
||||
int mask;
|
||||
|
||||
for (i = 0; i < 8; i++) {
|
||||
mask = 0x80 >> i;
|
||||
if (ssd->path_mask & mask)
|
||||
if (!chp_is_registered(ssd->chpid[i]))
|
||||
chp_new(ssd->chpid[i]);
|
||||
}
|
||||
}
|
||||
|
||||
void css_update_ssd_info(struct subchannel *sch)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (cio_is_console(sch->schid)) {
|
||||
/* Console is initialized too early for functions requiring
|
||||
* memory allocation. */
|
||||
ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw);
|
||||
} else {
|
||||
ret = chsc_get_ssd_info(sch->schid, &sch->ssd_info);
|
||||
if (ret)
|
||||
ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw);
|
||||
ssd_register_chpids(&sch->ssd_info);
|
||||
}
|
||||
}
|
||||
|
||||
static int css_register_subchannel(struct subchannel *sch)
|
||||
{
|
||||
int ret;
|
||||
|
||||
@ -135,9 +180,7 @@ css_register_subchannel(struct subchannel *sch)
|
||||
sch->dev.bus = &css_bus_type;
|
||||
sch->dev.release = &css_subchannel_release;
|
||||
sch->dev.groups = subch_attr_groups;
|
||||
|
||||
css_get_ssd_info(sch);
|
||||
|
||||
css_update_ssd_info(sch);
|
||||
/* make it known to the system */
|
||||
ret = css_sch_device_register(sch);
|
||||
if (ret) {
|
||||
|
||||
@ -148,6 +148,7 @@ extern int css_init_done;
|
||||
extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
|
||||
extern void css_process_crw(int, int);
|
||||
extern void css_reiterate_subchannels(void);
|
||||
void css_update_ssd_info(struct subchannel *sch);
|
||||
|
||||
#define __MAX_SUBCHANNEL 65535
|
||||
#define __MAX_SSID 3
|
||||
|
||||
@ -216,12 +216,18 @@ static ssize_t
|
||||
chpids_show (struct device * dev, struct device_attribute *attr, char * buf)
|
||||
{
|
||||
struct subchannel *sch = to_subchannel(dev);
|
||||
struct ssd_info *ssd = &sch->ssd_info;
|
||||
struct chsc_ssd_info *ssd = &sch->ssd_info;
|
||||
ssize_t ret = 0;
|
||||
int chp;
|
||||
int mask;
|
||||
|
||||
for (chp = 0; chp < 8; chp++)
|
||||
ret += sprintf (buf+ret, "%02x ", ssd->chpid[chp]);
|
||||
for (chp = 0; chp < 8; chp++) {
|
||||
mask = 0x80 >> chp;
|
||||
if (ssd->path_mask & mask)
|
||||
ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id);
|
||||
else
|
||||
ret += sprintf(buf + ret, "00 ");
|
||||
}
|
||||
ret += sprintf (buf+ret, "\n");
|
||||
return min((ssize_t)PAGE_SIZE, ret);
|
||||
}
|
||||
|
||||
@ -246,6 +246,7 @@ ccw_device_recog_done(struct ccw_device *cdev, int state)
|
||||
*/
|
||||
old_lpm = sch->lpm;
|
||||
stsch(sch->schid, &sch->schib);
|
||||
css_update_ssd_info(sch);
|
||||
sch->lpm = sch->schib.pmcw.pam & sch->opm;
|
||||
/* Check since device may again have become not operational. */
|
||||
if (!sch->schib.pmcw.dnv)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user