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/device.h>
12 #include <linux/module.h>
13 #include <linux/uaccess.h>
14 #include <linux/miscdevice.h>
16 #include <asm/compat.h>
22 #include "cio_debug.h"
27 static debug_info_t *chsc_debug_msg_id;
28 static debug_info_t *chsc_debug_log_id;
30 #define CHSC_MSG(imp, args...) do { \
31 debug_sprintf_event(chsc_debug_msg_id, imp , ##args); \
34 #define CHSC_LOG(imp, txt) do { \
35 debug_text_event(chsc_debug_log_id, imp , txt); \
38 static void CHSC_LOG_HEX(int level, void *data, int length)
41 debug_event(chsc_debug_log_id, level, data, length);
42 length -= chsc_debug_log_id->buf_size;
43 data += chsc_debug_log_id->buf_size;
47 MODULE_AUTHOR("IBM Corporation");
48 MODULE_DESCRIPTION("driver for s390 chsc subchannels");
49 MODULE_LICENSE("GPL");
51 static void chsc_subchannel_irq(struct subchannel *sch)
53 struct chsc_private *private = sch->private;
54 struct chsc_request *request = private->request;
55 struct irb *irb = (struct irb *)&S390_lowcore.irb;
58 CHSC_LOG_HEX(4, irb, sizeof(*irb));
59 /* Copy irb to provided request and set done. */
61 CHSC_MSG(0, "Interrupt on sch 0.%x.%04x with no request\n",
62 sch->schid.ssid, sch->schid.sch_no);
65 private->request = NULL;
66 memcpy(&request->irb, irb, sizeof(*irb));
67 cio_update_schib(sch);
68 complete(&request->completion);
69 put_device(&sch->dev);
72 static int chsc_subchannel_probe(struct subchannel *sch)
74 struct chsc_private *private;
77 CHSC_MSG(6, "Detected chsc subchannel 0.%x.%04x\n",
78 sch->schid.ssid, sch->schid.sch_no);
79 sch->isc = CHSC_SCH_ISC;
80 private = kzalloc(sizeof(*private), GFP_KERNEL);
83 ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch);
85 CHSC_MSG(0, "Failed to enable 0.%x.%04x: %d\n",
86 sch->schid.ssid, sch->schid.sch_no, ret);
89 sch->private = private;
90 if (dev_get_uevent_suppress(&sch->dev)) {
91 dev_set_uevent_suppress(&sch->dev, 0);
92 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
98 static int chsc_subchannel_remove(struct subchannel *sch)
100 struct chsc_private *private;
102 cio_disable_subchannel(sch);
103 private = sch->private;
105 if (private->request) {
106 complete(&private->request->completion);
107 put_device(&sch->dev);
113 static void chsc_subchannel_shutdown(struct subchannel *sch)
115 cio_disable_subchannel(sch);
118 static int chsc_subchannel_prepare(struct subchannel *sch)
123 * Don't allow suspend while the subchannel is not idle
124 * since we don't have a way to clear the subchannel and
125 * cannot disable it with a request running.
127 cc = stsch_err(sch->schid, &schib);
128 if (!cc && scsw_stctl(&schib.scsw))
133 static int chsc_subchannel_freeze(struct subchannel *sch)
135 return cio_disable_subchannel(sch);
138 static int chsc_subchannel_restore(struct subchannel *sch)
140 return cio_enable_subchannel(sch, (u32)(unsigned long)sch);
143 static struct css_device_id chsc_subchannel_ids[] = {
144 { .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, },
145 { /* end of list */ },
147 MODULE_DEVICE_TABLE(css, chsc_subchannel_ids);
149 static struct css_driver chsc_subchannel_driver = {
150 .owner = THIS_MODULE,
151 .subchannel_type = chsc_subchannel_ids,
152 .irq = chsc_subchannel_irq,
153 .probe = chsc_subchannel_probe,
154 .remove = chsc_subchannel_remove,
155 .shutdown = chsc_subchannel_shutdown,
156 .prepare = chsc_subchannel_prepare,
157 .freeze = chsc_subchannel_freeze,
158 .thaw = chsc_subchannel_restore,
159 .restore = chsc_subchannel_restore,
160 .name = "chsc_subchannel",
163 static int __init chsc_init_dbfs(void)
165 chsc_debug_msg_id = debug_register("chsc_msg", 16, 1,
167 if (!chsc_debug_msg_id)
169 debug_register_view(chsc_debug_msg_id, &debug_sprintf_view);
170 debug_set_level(chsc_debug_msg_id, 2);
171 chsc_debug_log_id = debug_register("chsc_log", 16, 1, 16);
172 if (!chsc_debug_log_id)
174 debug_register_view(chsc_debug_log_id, &debug_hex_ascii_view);
175 debug_set_level(chsc_debug_log_id, 2);
178 if (chsc_debug_msg_id)
179 debug_unregister(chsc_debug_msg_id);
183 static void chsc_remove_dbfs(void)
185 debug_unregister(chsc_debug_log_id);
186 debug_unregister(chsc_debug_msg_id);
189 static int __init chsc_init_sch_driver(void)
191 return css_driver_register(&chsc_subchannel_driver);
194 static void chsc_cleanup_sch_driver(void)
196 css_driver_unregister(&chsc_subchannel_driver);
199 static DEFINE_SPINLOCK(chsc_lock);
201 static int chsc_subchannel_match_next_free(struct device *dev, void *data)
203 struct subchannel *sch = to_subchannel(dev);
205 return sch->schib.pmcw.ena && !scsw_fctl(&sch->schib.scsw);
208 static struct subchannel *chsc_get_next_subchannel(struct subchannel *sch)
212 dev = driver_find_device(&chsc_subchannel_driver.drv,
213 sch ? &sch->dev : NULL, NULL,
214 chsc_subchannel_match_next_free);
215 return dev ? to_subchannel(dev) : NULL;
219 * chsc_async() - try to start a chsc request asynchronously
220 * @chsc_area: request to be started
221 * @request: request structure to associate
223 * Tries to start a chsc request on one of the existing chsc subchannels.
225 * %0 if the request was performed synchronously
226 * %-EINPROGRESS if the request was successfully started
227 * %-EBUSY if all chsc subchannels are busy
228 * %-ENODEV if no chsc subchannels are available
230 * interrupts disabled, chsc_lock held
232 static int chsc_async(struct chsc_async_area *chsc_area,
233 struct chsc_request *request)
236 struct chsc_private *private;
237 struct subchannel *sch = NULL;
241 chsc_area->header.key = PAGE_DEFAULT_KEY >> 4;
242 while ((sch = chsc_get_next_subchannel(sch))) {
243 spin_lock(sch->lock);
244 private = sch->private;
245 if (private->request) {
246 spin_unlock(sch->lock);
250 chsc_area->header.sid = sch->schid;
251 CHSC_LOG(2, "schid");
252 CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid));
253 cc = chsc(chsc_area);
254 sprintf(dbf, "cc:%d", cc);
261 sch->schib.scsw.cmd.fctl |= SCSW_FCTL_START_FUNC;
263 private->request = request;
271 spin_unlock(sch->lock);
272 CHSC_MSG(2, "chsc on 0.%x.%04x returned cc=%d\n",
273 sch->schid.ssid, sch->schid.sch_no, cc);
274 if (ret == -EINPROGRESS)
276 put_device(&sch->dev);
283 static void chsc_log_command(struct chsc_async_area *chsc_area)
287 sprintf(dbf, "CHSC:%x", chsc_area->header.code);
289 CHSC_LOG_HEX(0, chsc_area, 32);
292 static int chsc_examine_irb(struct chsc_request *request)
296 if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND))
298 backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK;
299 request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK;
300 if (scsw_cstat(&request->irb.scsw) == 0)
304 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROG_CHECK)
306 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROT_CHECK)
308 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_DATA_CHK)
310 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_CTRL_CHK)
315 static int chsc_ioctl_start(void __user *user_area)
317 struct chsc_request *request;
318 struct chsc_async_area *chsc_area;
322 if (!css_general_characteristics.dynio)
323 /* It makes no sense to try. */
325 chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
328 request = kzalloc(sizeof(*request), GFP_KERNEL);
333 init_completion(&request->completion);
334 if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
338 chsc_log_command(chsc_area);
339 spin_lock_irq(&chsc_lock);
340 ret = chsc_async(chsc_area, request);
341 spin_unlock_irq(&chsc_lock);
342 if (ret == -EINPROGRESS) {
343 wait_for_completion(&request->completion);
344 ret = chsc_examine_irb(request);
346 /* copy area back to user */
348 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
351 sprintf(dbf, "ret:%d", ret);
354 free_page((unsigned long)chsc_area);
358 static int chsc_ioctl_info_channel_path(void __user *user_cd)
360 struct chsc_chp_cd *cd;
363 struct chsc_header request;
374 struct chsc_header response;
375 u8 data[PAGE_SIZE - 20];
376 } __attribute__ ((packed)) *scpcd_area;
378 scpcd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
381 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
386 if (copy_from_user(cd, user_cd, sizeof(*cd))) {
390 scpcd_area->request.length = 0x0010;
391 scpcd_area->request.code = 0x0028;
392 scpcd_area->m = cd->m;
393 scpcd_area->fmt1 = cd->fmt;
394 scpcd_area->cssid = cd->chpid.cssid;
395 scpcd_area->first_chpid = cd->chpid.id;
396 scpcd_area->last_chpid = cd->chpid.id;
398 ccode = chsc(scpcd_area);
403 if (scpcd_area->response.code != 0x0001) {
405 CHSC_MSG(0, "scpcd: response code=%x\n",
406 scpcd_area->response.code);
409 memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
410 if (copy_to_user(user_cd, cd, sizeof(*cd)))
416 free_page((unsigned long)scpcd_area);
420 static int chsc_ioctl_info_cu(void __user *user_cd)
422 struct chsc_cu_cd *cd;
425 struct chsc_header request;
436 struct chsc_header response;
437 u8 data[PAGE_SIZE - 20];
438 } __attribute__ ((packed)) *scucd_area;
440 scucd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
443 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
448 if (copy_from_user(cd, user_cd, sizeof(*cd))) {
452 scucd_area->request.length = 0x0010;
453 scucd_area->request.code = 0x0028;
454 scucd_area->m = cd->m;
455 scucd_area->fmt1 = cd->fmt;
456 scucd_area->cssid = cd->cssid;
457 scucd_area->first_cun = cd->cun;
458 scucd_area->last_cun = cd->cun;
460 ccode = chsc(scucd_area);
465 if (scucd_area->response.code != 0x0001) {
467 CHSC_MSG(0, "scucd: response code=%x\n",
468 scucd_area->response.code);
471 memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length);
472 if (copy_to_user(user_cd, cd, sizeof(*cd)))
478 free_page((unsigned long)scucd_area);
482 static int chsc_ioctl_info_sch_cu(void __user *user_cud)
484 struct chsc_sch_cud *cud;
487 struct chsc_header request;
499 struct chsc_header response;
500 u8 data[PAGE_SIZE - 20];
501 } __attribute__ ((packed)) *sscud_area;
503 sscud_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
506 cud = kzalloc(sizeof(*cud), GFP_KERNEL);
511 if (copy_from_user(cud, user_cud, sizeof(*cud))) {
515 sscud_area->request.length = 0x0010;
516 sscud_area->request.code = 0x0006;
517 sscud_area->m = cud->schid.m;
518 sscud_area->fmt1 = cud->fmt;
519 sscud_area->ssid = cud->schid.ssid;
520 sscud_area->first_sch = cud->schid.sch_no;
521 sscud_area->cssid = cud->schid.cssid;
522 sscud_area->last_sch = cud->schid.sch_no;
524 ccode = chsc(sscud_area);
529 if (sscud_area->response.code != 0x0001) {
531 CHSC_MSG(0, "sscud: response code=%x\n",
532 sscud_area->response.code);
535 memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
536 if (copy_to_user(user_cud, cud, sizeof(*cud)))
542 free_page((unsigned long)sscud_area);
546 static int chsc_ioctl_conf_info(void __user *user_ci)
548 struct chsc_conf_info *ci;
551 struct chsc_header request;
561 struct chsc_header response;
562 u8 data[PAGE_SIZE - 20];
563 } __attribute__ ((packed)) *sci_area;
565 sci_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
568 ci = kzalloc(sizeof(*ci), GFP_KERNEL);
573 if (copy_from_user(ci, user_ci, sizeof(*ci))) {
577 sci_area->request.length = 0x0010;
578 sci_area->request.code = 0x0012;
579 sci_area->m = ci->id.m;
580 sci_area->fmt1 = ci->fmt;
581 sci_area->cssid = ci->id.cssid;
582 sci_area->ssid = ci->id.ssid;
584 ccode = chsc(sci_area);
589 if (sci_area->response.code != 0x0001) {
591 CHSC_MSG(0, "sci: response code=%x\n",
592 sci_area->response.code);
595 memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
596 if (copy_to_user(user_ci, ci, sizeof(*ci)))
602 free_page((unsigned long)sci_area);
606 static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
608 struct chsc_comp_list *ccl;
611 struct chsc_header request;
619 struct chsc_header response;
620 u8 data[PAGE_SIZE - 36];
621 } __attribute__ ((packed)) *sccl_area;
628 } __attribute__ ((packed)) *chpid_parm;
634 } __attribute__ ((packed)) *cssids_parm;
636 sccl_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
639 ccl = kzalloc(sizeof(*ccl), GFP_KERNEL);
644 if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {
648 sccl_area->request.length = 0x0020;
649 sccl_area->request.code = 0x0030;
650 sccl_area->fmt = ccl->req.fmt;
651 sccl_area->ctype = ccl->req.ctype;
652 switch (sccl_area->ctype) {
655 chpid_parm = (void *)&sccl_area->list_parm;
656 chpid_parm->m = ccl->req.chpid.m;
657 chpid_parm->cssid = ccl->req.chpid.chp.cssid;
658 chpid_parm->chpid = ccl->req.chpid.chp.id;
661 case CCL_CSS_IMG_CONF_CHAR:
662 cssids_parm = (void *)&sccl_area->list_parm;
663 cssids_parm->f_cssid = ccl->req.cssids.f_cssid;
664 cssids_parm->l_cssid = ccl->req.cssids.l_cssid;
667 ccode = chsc(sccl_area);
672 if (sccl_area->response.code != 0x0001) {
674 CHSC_MSG(0, "sccl: response code=%x\n",
675 sccl_area->response.code);
678 memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
679 if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
685 free_page((unsigned long)sccl_area);
689 static int chsc_ioctl_chpd(void __user *user_chpd)
691 struct chsc_scpd *scpd_area;
692 struct chsc_cpd_info *chpd;
695 chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
696 scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
697 if (!scpd_area || !chpd) {
701 if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
705 ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
706 chpd->rfmt, chpd->c, chpd->m,
710 memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length);
711 if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
715 free_page((unsigned long)scpd_area);
719 static int chsc_ioctl_dcal(void __user *user_dcal)
721 struct chsc_dcal *dcal;
724 struct chsc_header request;
732 struct chsc_header response;
733 u8 data[PAGE_SIZE - 36];
734 } __attribute__ ((packed)) *sdcal_area;
736 sdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
739 dcal = kzalloc(sizeof(*dcal), GFP_KERNEL);
744 if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
748 sdcal_area->request.length = 0x0020;
749 sdcal_area->request.code = 0x0034;
750 sdcal_area->atype = dcal->req.atype;
751 sdcal_area->fmt = dcal->req.fmt;
752 memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
753 sizeof(sdcal_area->list_parm));
755 ccode = chsc(sdcal_area);
760 if (sdcal_area->response.code != 0x0001) {
762 CHSC_MSG(0, "sdcal: response code=%x\n",
763 sdcal_area->response.code);
766 memcpy(&dcal->sdcal, &sdcal_area->response,
767 sdcal_area->response.length);
768 if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
774 free_page((unsigned long)sdcal_area);
778 static long chsc_ioctl(struct file *filp, unsigned int cmd,
783 CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
784 if (is_compat_task())
785 argp = compat_ptr(arg);
787 argp = (void __user *)arg;
790 return chsc_ioctl_start(argp);
791 case CHSC_INFO_CHANNEL_PATH:
792 return chsc_ioctl_info_channel_path(argp);
794 return chsc_ioctl_info_cu(argp);
795 case CHSC_INFO_SCH_CU:
796 return chsc_ioctl_info_sch_cu(argp);
798 return chsc_ioctl_conf_info(argp);
800 return chsc_ioctl_conf_comp_list(argp);
802 return chsc_ioctl_chpd(argp);
804 return chsc_ioctl_dcal(argp);
805 default: /* unknown ioctl number */
810 static const struct file_operations chsc_fops = {
811 .owner = THIS_MODULE,
812 .open = nonseekable_open,
813 .unlocked_ioctl = chsc_ioctl,
814 .compat_ioctl = chsc_ioctl,
818 static struct miscdevice chsc_misc_device = {
819 .minor = MISC_DYNAMIC_MINOR,
824 static int __init chsc_misc_init(void)
826 return misc_register(&chsc_misc_device);
829 static void chsc_misc_cleanup(void)
831 misc_deregister(&chsc_misc_device);
834 static int __init chsc_sch_init(void)
838 ret = chsc_init_dbfs();
841 isc_register(CHSC_SCH_ISC);
842 ret = chsc_init_sch_driver();
845 ret = chsc_misc_init();
850 chsc_cleanup_sch_driver();
852 isc_unregister(CHSC_SCH_ISC);
857 static void __exit chsc_sch_exit(void)
860 chsc_cleanup_sch_driver();
861 isc_unregister(CHSC_SCH_ISC);
865 module_init(chsc_sch_init);
866 module_exit(chsc_sch_exit);