forked from Minki/linux
[S390] Cleanup of CHSC event handling.
Change CHSC event handling to be more easily extensible. 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
0f008aa300
commit
184357a596
@ -461,144 +461,136 @@ __get_chpid_from_lir(void *data)
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return (u16) (lir->indesc[0]&0x000000ff);
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}
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int
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chsc_process_crw(void)
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struct chsc_sei_area {
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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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u8 ccdf[4096 - 16 - 24]; /* content-code dependent field */
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/* ccdf has to be big enough for a link-incident record */
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} __attribute__ ((packed));
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static int chsc_process_sei_link_incident(struct chsc_sei_area *sei_area)
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{
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int chpid;
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CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n",
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sei_area->rs, sei_area->rsid);
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if (sei_area->rs != 4)
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return 0;
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chpid = __get_chpid_from_lir(sei_area->ccdf);
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if (chpid < 0)
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CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n");
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else
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s390_set_chpid_offline(chpid);
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return 0;
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}
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static int chsc_process_sei_res_acc(struct chsc_sei_area *sei_area)
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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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} __attribute__ ((packed)) *sei_area;
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struct device *dev;
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int status;
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int rc;
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CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
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"rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
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if (sei_area->rs != 4)
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return 0;
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/* allocate a new channel path structure, if needed */
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status = get_chp_status(sei_area->rsid);
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if (status < 0)
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new_channel_path(sei_area->rsid);
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else if (!status)
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return 0;
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dev = get_device(&css[0]->chps[sei_area->rsid]->dev);
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memset(&res_data, 0, sizeof(struct res_acc_data));
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res_data.chp = to_channelpath(dev);
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if ((sei_area->vf & 0xc0) != 0) {
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res_data.fla = sei_area->fla;
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if ((sei_area->vf & 0xc0) == 0xc0)
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/* full link address */
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res_data.fla_mask = 0xffff;
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else
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/* link address */
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res_data.fla_mask = 0xff00;
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}
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rc = s390_process_res_acc(&res_data);
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put_device(dev);
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return rc;
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}
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static int chsc_process_sei(struct chsc_sei_area *sei_area)
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{
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int rc;
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/* Check if we might have lost some information. */
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if (sei_area->flags & 0x40)
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CIO_CRW_EVENT(2, "chsc: event overflow\n");
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/* which kind of information was stored? */
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rc = 0;
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switch (sei_area->cc) {
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case 1: /* link incident*/
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rc = chsc_process_sei_link_incident(sei_area);
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break;
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case 2: /* i/o resource accessibiliy */
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rc = chsc_process_sei_res_acc(sei_area);
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break;
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default: /* other stuff */
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CIO_CRW_EVENT(4, "chsc: unhandled sei content code %d\n",
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sei_area->cc);
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break;
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}
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return rc;
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}
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int chsc_process_crw(void)
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{
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struct chsc_sei_area *sei_area;
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int ret;
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int rc;
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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
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* 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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/* Access to sei_page is serialized through machine check handler
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* thread, so no need for locking. */
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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));
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memset(&res_data, 0, sizeof(struct res_acc_data));
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sei_area->request.length = 0x0010;
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sei_area->request.code = 0x000e;
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if (chsc(sei_area))
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break;
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ccode = chsc(sei_area);
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if (ccode > 0)
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return 0;
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switch (sei_area->response.code) {
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/* for debug purposes, check for problems */
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case 0x0001:
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CIO_CRW_EVENT(4, "chsc_process_crw: event information "
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"successfully stored\n");
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break; /* everything ok */
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case 0x0002:
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CIO_CRW_EVENT(2,
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"chsc_process_crw: invalid command!\n");
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return 0;
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case 0x0003:
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CIO_CRW_EVENT(2, "chsc_process_crw: error in chsc "
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"request block!\n");
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return 0;
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case 0x0005:
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CIO_CRW_EVENT(2, "chsc_process_crw: no event "
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"information stored\n");
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return 0;
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default:
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CIO_CRW_EVENT(2, "chsc_process_crw: chsc response %d\n",
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if (sei_area->response.code == 0x0001) {
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CIO_CRW_EVENT(4, "chsc: sei successful\n");
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rc = chsc_process_sei(sei_area);
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if (rc)
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ret = rc;
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} else {
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CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
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sei_area->response.code);
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return 0;
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}
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/* Check if we might have lost some information. */
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if (sei_area->flags & 0x40)
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CIO_CRW_EVENT(2, "chsc_process_crw: Event information "
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"has been lost due to overflow!\n");
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if (sei_area->rs != 4) {
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CIO_CRW_EVENT(2, "chsc_process_crw: reporting source "
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"(%04X) isn't a chpid!\n",
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sei_area->rsid);
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continue;
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}
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/* which kind of information was stored? */
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switch (sei_area->cc) {
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case 1: /* link incident*/
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CIO_CRW_EVENT(4, "chsc_process_crw: "
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"channel subsystem reports link incident,"
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" reporting source is chpid %x\n",
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sei_area->rsid);
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chpid = __get_chpid_from_lir(sei_area->ccdf);
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if (chpid < 0)
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CIO_CRW_EVENT(4, "%s: Invalid LIR, skipping\n",
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__FUNCTION__);
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else
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s390_set_chpid_offline(chpid);
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break;
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case 2: /* i/o resource accessibiliy */
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CIO_CRW_EVENT(4, "chsc_process_crw: "
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"channel subsystem reports some I/O "
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"devices may have become accessible\n");
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pr_debug("Data received after sei: \n");
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pr_debug("Validity flags: %x\n", sei_area->vf);
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/* allocate a new channel path structure, if needed */
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status = get_chp_status(sei_area->rsid);
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if (status < 0)
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new_channel_path(sei_area->rsid);
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else if (!status)
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break;
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dev = get_device(&css[0]->chps[sei_area->rsid]->dev);
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res_data.chp = to_channelpath(dev);
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pr_debug("chpid: %x", sei_area->rsid);
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if ((sei_area->vf & 0xc0) != 0) {
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res_data.fla = sei_area->fla;
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if ((sei_area->vf & 0xc0) == 0xc0) {
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pr_debug(" full link addr: %x",
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sei_area->fla);
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res_data.fla_mask = 0xffff;
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} else {
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pr_debug(" link addr: %x",
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sei_area->fla);
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res_data.fla_mask = 0xff00;
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}
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}
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ret = s390_process_res_acc(&res_data);
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pr_debug("\n\n");
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put_device(dev);
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break;
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default: /* other stuff */
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CIO_CRW_EVENT(4, "chsc_process_crw: event %d\n",
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sei_area->cc);
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ret = 0;
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break;
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}
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} while (sei_area->flags & 0x80);
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return ret;
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}
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