2 * Driver for s390 chsc subchannels
4 * Copyright IBM Corp. 2008, 2009
6 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
10 #include <linux/slab.h>
11 #include <linux/compat.h>
12 #include <linux/device.h>
13 #include <linux/module.h>
14 #include <linux/uaccess.h>
15 #include <linux/miscdevice.h>
17 #include <asm/compat.h>
23 #include "cio_debug.h"
28 static debug_info_t *chsc_debug_msg_id;
29 static debug_info_t *chsc_debug_log_id;
31 #define CHSC_MSG(imp, args...) do { \
32 debug_sprintf_event(chsc_debug_msg_id, imp , ##args); \
35 #define CHSC_LOG(imp, txt) do { \
36 debug_text_event(chsc_debug_log_id, imp , txt); \
39 static void CHSC_LOG_HEX(int level, void *data, int length)
42 debug_event(chsc_debug_log_id, level, data, length);
43 length -= chsc_debug_log_id->buf_size;
44 data += chsc_debug_log_id->buf_size;
48 MODULE_AUTHOR("IBM Corporation");
49 MODULE_DESCRIPTION("driver for s390 chsc subchannels");
50 MODULE_LICENSE("GPL");
52 static void chsc_subchannel_irq(struct subchannel *sch)
54 struct chsc_private *private = dev_get_drvdata(&sch->dev);
55 struct chsc_request *request = private->request;
56 struct irb *irb = (struct irb *)&S390_lowcore.irb;
59 CHSC_LOG_HEX(4, irb, sizeof(*irb));
60 /* Copy irb to provided request and set done. */
62 CHSC_MSG(0, "Interrupt on sch 0.%x.%04x with no request\n",
63 sch->schid.ssid, sch->schid.sch_no);
66 private->request = NULL;
67 memcpy(&request->irb, irb, sizeof(*irb));
68 cio_update_schib(sch);
69 complete(&request->completion);
70 put_device(&sch->dev);
73 static int chsc_subchannel_probe(struct subchannel *sch)
75 struct chsc_private *private;
78 CHSC_MSG(6, "Detected chsc subchannel 0.%x.%04x\n",
79 sch->schid.ssid, sch->schid.sch_no);
80 sch->isc = CHSC_SCH_ISC;
81 private = kzalloc(sizeof(*private), GFP_KERNEL);
84 dev_set_drvdata(&sch->dev, private);
85 ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch);
87 CHSC_MSG(0, "Failed to enable 0.%x.%04x: %d\n",
88 sch->schid.ssid, sch->schid.sch_no, ret);
89 dev_set_drvdata(&sch->dev, NULL);
92 if (dev_get_uevent_suppress(&sch->dev)) {
93 dev_set_uevent_suppress(&sch->dev, 0);
94 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
100 static int chsc_subchannel_remove(struct subchannel *sch)
102 struct chsc_private *private;
104 cio_disable_subchannel(sch);
105 private = dev_get_drvdata(&sch->dev);
106 dev_set_drvdata(&sch->dev, NULL);
107 if (private->request) {
108 complete(&private->request->completion);
109 put_device(&sch->dev);
115 static void chsc_subchannel_shutdown(struct subchannel *sch)
117 cio_disable_subchannel(sch);
120 static int chsc_subchannel_prepare(struct subchannel *sch)
125 * Don't allow suspend while the subchannel is not idle
126 * since we don't have a way to clear the subchannel and
127 * cannot disable it with a request running.
129 cc = stsch_err(sch->schid, &schib);
130 if (!cc && scsw_stctl(&schib.scsw))
135 static int chsc_subchannel_freeze(struct subchannel *sch)
137 return cio_disable_subchannel(sch);
140 static int chsc_subchannel_restore(struct subchannel *sch)
142 return cio_enable_subchannel(sch, (u32)(unsigned long)sch);
145 static struct css_device_id chsc_subchannel_ids[] = {
146 { .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, },
147 { /* end of list */ },
149 MODULE_DEVICE_TABLE(css, chsc_subchannel_ids);
151 static struct css_driver chsc_subchannel_driver = {
153 .owner = THIS_MODULE,
154 .name = "chsc_subchannel",
156 .subchannel_type = chsc_subchannel_ids,
157 .irq = chsc_subchannel_irq,
158 .probe = chsc_subchannel_probe,
159 .remove = chsc_subchannel_remove,
160 .shutdown = chsc_subchannel_shutdown,
161 .prepare = chsc_subchannel_prepare,
162 .freeze = chsc_subchannel_freeze,
163 .thaw = chsc_subchannel_restore,
164 .restore = chsc_subchannel_restore,
167 static int __init chsc_init_dbfs(void)
169 chsc_debug_msg_id = debug_register("chsc_msg", 16, 1,
171 if (!chsc_debug_msg_id)
173 debug_register_view(chsc_debug_msg_id, &debug_sprintf_view);
174 debug_set_level(chsc_debug_msg_id, 2);
175 chsc_debug_log_id = debug_register("chsc_log", 16, 1, 16);
176 if (!chsc_debug_log_id)
178 debug_register_view(chsc_debug_log_id, &debug_hex_ascii_view);
179 debug_set_level(chsc_debug_log_id, 2);
182 if (chsc_debug_msg_id)
183 debug_unregister(chsc_debug_msg_id);
187 static void chsc_remove_dbfs(void)
189 debug_unregister(chsc_debug_log_id);
190 debug_unregister(chsc_debug_msg_id);
193 static int __init chsc_init_sch_driver(void)
195 return css_driver_register(&chsc_subchannel_driver);
198 static void chsc_cleanup_sch_driver(void)
200 css_driver_unregister(&chsc_subchannel_driver);
203 static DEFINE_SPINLOCK(chsc_lock);
205 static int chsc_subchannel_match_next_free(struct device *dev, void *data)
207 struct subchannel *sch = to_subchannel(dev);
209 return sch->schib.pmcw.ena && !scsw_fctl(&sch->schib.scsw);
212 static struct subchannel *chsc_get_next_subchannel(struct subchannel *sch)
216 dev = driver_find_device(&chsc_subchannel_driver.drv,
217 sch ? &sch->dev : NULL, NULL,
218 chsc_subchannel_match_next_free);
219 return dev ? to_subchannel(dev) : NULL;
223 * chsc_async() - try to start a chsc request asynchronously
224 * @chsc_area: request to be started
225 * @request: request structure to associate
227 * Tries to start a chsc request on one of the existing chsc subchannels.
229 * %0 if the request was performed synchronously
230 * %-EINPROGRESS if the request was successfully started
231 * %-EBUSY if all chsc subchannels are busy
232 * %-ENODEV if no chsc subchannels are available
234 * interrupts disabled, chsc_lock held
236 static int chsc_async(struct chsc_async_area *chsc_area,
237 struct chsc_request *request)
240 struct chsc_private *private;
241 struct subchannel *sch = NULL;
245 chsc_area->header.key = PAGE_DEFAULT_KEY >> 4;
246 while ((sch = chsc_get_next_subchannel(sch))) {
247 spin_lock(sch->lock);
248 private = dev_get_drvdata(&sch->dev);
249 if (private->request) {
250 spin_unlock(sch->lock);
254 chsc_area->header.sid = sch->schid;
255 CHSC_LOG(2, "schid");
256 CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid));
257 cc = chsc(chsc_area);
258 sprintf(dbf, "cc:%d", cc);
265 sch->schib.scsw.cmd.fctl |= SCSW_FCTL_START_FUNC;
267 private->request = request;
275 spin_unlock(sch->lock);
276 CHSC_MSG(2, "chsc on 0.%x.%04x returned cc=%d\n",
277 sch->schid.ssid, sch->schid.sch_no, cc);
278 if (ret == -EINPROGRESS)
280 put_device(&sch->dev);
287 static void chsc_log_command(struct chsc_async_area *chsc_area)
291 sprintf(dbf, "CHSC:%x", chsc_area->header.code);
293 CHSC_LOG_HEX(0, chsc_area, 32);
296 static int chsc_examine_irb(struct chsc_request *request)
300 if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND))
302 backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK;
303 request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK;
304 if (scsw_cstat(&request->irb.scsw) == 0)
308 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROG_CHECK)
310 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROT_CHECK)
312 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_DATA_CHK)
314 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_CTRL_CHK)
319 static int chsc_ioctl_start(void __user *user_area)
321 struct chsc_request *request;
322 struct chsc_async_area *chsc_area;
326 if (!css_general_characteristics.dynio)
327 /* It makes no sense to try. */
329 chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
332 request = kzalloc(sizeof(*request), GFP_KERNEL);
337 init_completion(&request->completion);
338 if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
342 chsc_log_command(chsc_area);
343 spin_lock_irq(&chsc_lock);
344 ret = chsc_async(chsc_area, request);
345 spin_unlock_irq(&chsc_lock);
346 if (ret == -EINPROGRESS) {
347 wait_for_completion(&request->completion);
348 ret = chsc_examine_irb(request);
350 /* copy area back to user */
352 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
355 sprintf(dbf, "ret:%d", ret);
358 free_page((unsigned long)chsc_area);
362 static int chsc_ioctl_info_channel_path(void __user *user_cd)
364 struct chsc_chp_cd *cd;
367 struct chsc_header request;
378 struct chsc_header response;
379 u8 data[PAGE_SIZE - 20];
380 } __attribute__ ((packed)) *scpcd_area;
382 scpcd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
385 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
390 if (copy_from_user(cd, user_cd, sizeof(*cd))) {
394 scpcd_area->request.length = 0x0010;
395 scpcd_area->request.code = 0x0028;
396 scpcd_area->m = cd->m;
397 scpcd_area->fmt1 = cd->fmt;
398 scpcd_area->cssid = cd->chpid.cssid;
399 scpcd_area->first_chpid = cd->chpid.id;
400 scpcd_area->last_chpid = cd->chpid.id;
402 ccode = chsc(scpcd_area);
407 if (scpcd_area->response.code != 0x0001) {
409 CHSC_MSG(0, "scpcd: response code=%x\n",
410 scpcd_area->response.code);
413 memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
414 if (copy_to_user(user_cd, cd, sizeof(*cd)))
420 free_page((unsigned long)scpcd_area);
424 static int chsc_ioctl_info_cu(void __user *user_cd)
426 struct chsc_cu_cd *cd;
429 struct chsc_header request;
440 struct chsc_header response;
441 u8 data[PAGE_SIZE - 20];
442 } __attribute__ ((packed)) *scucd_area;
444 scucd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
447 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
452 if (copy_from_user(cd, user_cd, sizeof(*cd))) {
456 scucd_area->request.length = 0x0010;
457 scucd_area->request.code = 0x0028;
458 scucd_area->m = cd->m;
459 scucd_area->fmt1 = cd->fmt;
460 scucd_area->cssid = cd->cssid;
461 scucd_area->first_cun = cd->cun;
462 scucd_area->last_cun = cd->cun;
464 ccode = chsc(scucd_area);
469 if (scucd_area->response.code != 0x0001) {
471 CHSC_MSG(0, "scucd: response code=%x\n",
472 scucd_area->response.code);
475 memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length);
476 if (copy_to_user(user_cd, cd, sizeof(*cd)))
482 free_page((unsigned long)scucd_area);
486 static int chsc_ioctl_info_sch_cu(void __user *user_cud)
488 struct chsc_sch_cud *cud;
491 struct chsc_header request;
503 struct chsc_header response;
504 u8 data[PAGE_SIZE - 20];
505 } __attribute__ ((packed)) *sscud_area;
507 sscud_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
510 cud = kzalloc(sizeof(*cud), GFP_KERNEL);
515 if (copy_from_user(cud, user_cud, sizeof(*cud))) {
519 sscud_area->request.length = 0x0010;
520 sscud_area->request.code = 0x0006;
521 sscud_area->m = cud->schid.m;
522 sscud_area->fmt1 = cud->fmt;
523 sscud_area->ssid = cud->schid.ssid;
524 sscud_area->first_sch = cud->schid.sch_no;
525 sscud_area->cssid = cud->schid.cssid;
526 sscud_area->last_sch = cud->schid.sch_no;
528 ccode = chsc(sscud_area);
533 if (sscud_area->response.code != 0x0001) {
535 CHSC_MSG(0, "sscud: response code=%x\n",
536 sscud_area->response.code);
539 memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
540 if (copy_to_user(user_cud, cud, sizeof(*cud)))
546 free_page((unsigned long)sscud_area);
550 static int chsc_ioctl_conf_info(void __user *user_ci)
552 struct chsc_conf_info *ci;
555 struct chsc_header request;
565 struct chsc_header response;
566 u8 data[PAGE_SIZE - 20];
567 } __attribute__ ((packed)) *sci_area;
569 sci_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
572 ci = kzalloc(sizeof(*ci), GFP_KERNEL);
577 if (copy_from_user(ci, user_ci, sizeof(*ci))) {
581 sci_area->request.length = 0x0010;
582 sci_area->request.code = 0x0012;
583 sci_area->m = ci->id.m;
584 sci_area->fmt1 = ci->fmt;
585 sci_area->cssid = ci->id.cssid;
586 sci_area->ssid = ci->id.ssid;
588 ccode = chsc(sci_area);
593 if (sci_area->response.code != 0x0001) {
595 CHSC_MSG(0, "sci: response code=%x\n",
596 sci_area->response.code);
599 memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
600 if (copy_to_user(user_ci, ci, sizeof(*ci)))
606 free_page((unsigned long)sci_area);
610 static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
612 struct chsc_comp_list *ccl;
615 struct chsc_header request;
623 struct chsc_header response;
624 u8 data[PAGE_SIZE - 36];
625 } __attribute__ ((packed)) *sccl_area;
632 } __attribute__ ((packed)) *chpid_parm;
638 } __attribute__ ((packed)) *cssids_parm;
640 sccl_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
643 ccl = kzalloc(sizeof(*ccl), GFP_KERNEL);
648 if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {
652 sccl_area->request.length = 0x0020;
653 sccl_area->request.code = 0x0030;
654 sccl_area->fmt = ccl->req.fmt;
655 sccl_area->ctype = ccl->req.ctype;
656 switch (sccl_area->ctype) {
659 chpid_parm = (void *)&sccl_area->list_parm;
660 chpid_parm->m = ccl->req.chpid.m;
661 chpid_parm->cssid = ccl->req.chpid.chp.cssid;
662 chpid_parm->chpid = ccl->req.chpid.chp.id;
665 case CCL_CSS_IMG_CONF_CHAR:
666 cssids_parm = (void *)&sccl_area->list_parm;
667 cssids_parm->f_cssid = ccl->req.cssids.f_cssid;
668 cssids_parm->l_cssid = ccl->req.cssids.l_cssid;
671 ccode = chsc(sccl_area);
676 if (sccl_area->response.code != 0x0001) {
678 CHSC_MSG(0, "sccl: response code=%x\n",
679 sccl_area->response.code);
682 memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
683 if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
689 free_page((unsigned long)sccl_area);
693 static int chsc_ioctl_chpd(void __user *user_chpd)
695 struct chsc_scpd *scpd_area;
696 struct chsc_cpd_info *chpd;
699 chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
700 scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
701 if (!scpd_area || !chpd) {
705 if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
709 ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
710 chpd->rfmt, chpd->c, chpd->m,
714 memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length);
715 if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
719 free_page((unsigned long)scpd_area);
723 static int chsc_ioctl_dcal(void __user *user_dcal)
725 struct chsc_dcal *dcal;
728 struct chsc_header request;
736 struct chsc_header response;
737 u8 data[PAGE_SIZE - 36];
738 } __attribute__ ((packed)) *sdcal_area;
740 sdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
743 dcal = kzalloc(sizeof(*dcal), GFP_KERNEL);
748 if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
752 sdcal_area->request.length = 0x0020;
753 sdcal_area->request.code = 0x0034;
754 sdcal_area->atype = dcal->req.atype;
755 sdcal_area->fmt = dcal->req.fmt;
756 memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
757 sizeof(sdcal_area->list_parm));
759 ccode = chsc(sdcal_area);
764 if (sdcal_area->response.code != 0x0001) {
766 CHSC_MSG(0, "sdcal: response code=%x\n",
767 sdcal_area->response.code);
770 memcpy(&dcal->sdcal, &sdcal_area->response,
771 sdcal_area->response.length);
772 if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
778 free_page((unsigned long)sdcal_area);
782 static long chsc_ioctl(struct file *filp, unsigned int cmd,
787 CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
788 if (is_compat_task())
789 argp = compat_ptr(arg);
791 argp = (void __user *)arg;
794 return chsc_ioctl_start(argp);
795 case CHSC_INFO_CHANNEL_PATH:
796 return chsc_ioctl_info_channel_path(argp);
798 return chsc_ioctl_info_cu(argp);
799 case CHSC_INFO_SCH_CU:
800 return chsc_ioctl_info_sch_cu(argp);
802 return chsc_ioctl_conf_info(argp);
804 return chsc_ioctl_conf_comp_list(argp);
806 return chsc_ioctl_chpd(argp);
808 return chsc_ioctl_dcal(argp);
809 default: /* unknown ioctl number */
814 static const struct file_operations chsc_fops = {
815 .owner = THIS_MODULE,
816 .open = nonseekable_open,
817 .unlocked_ioctl = chsc_ioctl,
818 .compat_ioctl = chsc_ioctl,
822 static struct miscdevice chsc_misc_device = {
823 .minor = MISC_DYNAMIC_MINOR,
828 static int __init chsc_misc_init(void)
830 return misc_register(&chsc_misc_device);
833 static void chsc_misc_cleanup(void)
835 misc_deregister(&chsc_misc_device);
838 static int __init chsc_sch_init(void)
842 ret = chsc_init_dbfs();
845 isc_register(CHSC_SCH_ISC);
846 ret = chsc_init_sch_driver();
849 ret = chsc_misc_init();
854 chsc_cleanup_sch_driver();
856 isc_unregister(CHSC_SCH_ISC);
861 static void __exit chsc_sch_exit(void)
864 chsc_cleanup_sch_driver();
865 isc_unregister(CHSC_SCH_ISC);
869 module_init(chsc_sch_init);
870 module_exit(chsc_sch_exit);