2 * Driver for s390 chsc subchannels
4 * Copyright IBM Corp. 2008, 2011
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>
16 #include <linux/kernel_stat.h>
18 #include <asm/compat.h>
24 #include "cio_debug.h"
29 static debug_info_t *chsc_debug_msg_id;
30 static debug_info_t *chsc_debug_log_id;
32 static struct chsc_request *on_close_request;
33 static struct chsc_async_area *on_close_chsc_area;
34 static DEFINE_MUTEX(on_close_mutex);
36 #define CHSC_MSG(imp, args...) do { \
37 debug_sprintf_event(chsc_debug_msg_id, imp , ##args); \
40 #define CHSC_LOG(imp, txt) do { \
41 debug_text_event(chsc_debug_log_id, imp , txt); \
44 static void CHSC_LOG_HEX(int level, void *data, int length)
47 debug_event(chsc_debug_log_id, level, data, length);
48 length -= chsc_debug_log_id->buf_size;
49 data += chsc_debug_log_id->buf_size;
53 MODULE_AUTHOR("IBM Corporation");
54 MODULE_DESCRIPTION("driver for s390 chsc subchannels");
55 MODULE_LICENSE("GPL");
57 static void chsc_subchannel_irq(struct subchannel *sch)
59 struct chsc_private *private = dev_get_drvdata(&sch->dev);
60 struct chsc_request *request = private->request;
61 struct irb *irb = this_cpu_ptr(&cio_irb);
64 CHSC_LOG_HEX(4, irb, sizeof(*irb));
65 inc_irq_stat(IRQIO_CSC);
67 /* Copy irb to provided request and set done. */
69 CHSC_MSG(0, "Interrupt on sch 0.%x.%04x with no request\n",
70 sch->schid.ssid, sch->schid.sch_no);
73 private->request = NULL;
74 memcpy(&request->irb, irb, sizeof(*irb));
75 cio_update_schib(sch);
76 complete(&request->completion);
77 put_device(&sch->dev);
80 static int chsc_subchannel_probe(struct subchannel *sch)
82 struct chsc_private *private;
85 CHSC_MSG(6, "Detected chsc subchannel 0.%x.%04x\n",
86 sch->schid.ssid, sch->schid.sch_no);
87 sch->isc = CHSC_SCH_ISC;
88 private = kzalloc(sizeof(*private), GFP_KERNEL);
91 dev_set_drvdata(&sch->dev, private);
92 ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch);
94 CHSC_MSG(0, "Failed to enable 0.%x.%04x: %d\n",
95 sch->schid.ssid, sch->schid.sch_no, ret);
96 dev_set_drvdata(&sch->dev, NULL);
99 if (dev_get_uevent_suppress(&sch->dev)) {
100 dev_set_uevent_suppress(&sch->dev, 0);
101 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
107 static int chsc_subchannel_remove(struct subchannel *sch)
109 struct chsc_private *private;
111 cio_disable_subchannel(sch);
112 private = dev_get_drvdata(&sch->dev);
113 dev_set_drvdata(&sch->dev, NULL);
114 if (private->request) {
115 complete(&private->request->completion);
116 put_device(&sch->dev);
122 static void chsc_subchannel_shutdown(struct subchannel *sch)
124 cio_disable_subchannel(sch);
127 static int chsc_subchannel_prepare(struct subchannel *sch)
132 * Don't allow suspend while the subchannel is not idle
133 * since we don't have a way to clear the subchannel and
134 * cannot disable it with a request running.
136 cc = stsch(sch->schid, &schib);
137 if (!cc && scsw_stctl(&schib.scsw))
142 static int chsc_subchannel_freeze(struct subchannel *sch)
144 return cio_disable_subchannel(sch);
147 static int chsc_subchannel_restore(struct subchannel *sch)
149 return cio_enable_subchannel(sch, (u32)(unsigned long)sch);
152 static struct css_device_id chsc_subchannel_ids[] = {
153 { .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, },
154 { /* end of list */ },
156 MODULE_DEVICE_TABLE(css, chsc_subchannel_ids);
158 static struct css_driver chsc_subchannel_driver = {
160 .owner = THIS_MODULE,
161 .name = "chsc_subchannel",
163 .subchannel_type = chsc_subchannel_ids,
164 .irq = chsc_subchannel_irq,
165 .probe = chsc_subchannel_probe,
166 .remove = chsc_subchannel_remove,
167 .shutdown = chsc_subchannel_shutdown,
168 .prepare = chsc_subchannel_prepare,
169 .freeze = chsc_subchannel_freeze,
170 .thaw = chsc_subchannel_restore,
171 .restore = chsc_subchannel_restore,
174 static int __init chsc_init_dbfs(void)
176 chsc_debug_msg_id = debug_register("chsc_msg", 8, 1, 4 * sizeof(long));
177 if (!chsc_debug_msg_id)
179 debug_register_view(chsc_debug_msg_id, &debug_sprintf_view);
180 debug_set_level(chsc_debug_msg_id, 2);
181 chsc_debug_log_id = debug_register("chsc_log", 16, 1, 16);
182 if (!chsc_debug_log_id)
184 debug_register_view(chsc_debug_log_id, &debug_hex_ascii_view);
185 debug_set_level(chsc_debug_log_id, 2);
188 debug_unregister(chsc_debug_msg_id);
192 static void chsc_remove_dbfs(void)
194 debug_unregister(chsc_debug_log_id);
195 debug_unregister(chsc_debug_msg_id);
198 static int __init chsc_init_sch_driver(void)
200 return css_driver_register(&chsc_subchannel_driver);
203 static void chsc_cleanup_sch_driver(void)
205 css_driver_unregister(&chsc_subchannel_driver);
208 static DEFINE_SPINLOCK(chsc_lock);
210 static int chsc_subchannel_match_next_free(struct device *dev, void *data)
212 struct subchannel *sch = to_subchannel(dev);
214 return sch->schib.pmcw.ena && !scsw_fctl(&sch->schib.scsw);
217 static struct subchannel *chsc_get_next_subchannel(struct subchannel *sch)
221 dev = driver_find_device(&chsc_subchannel_driver.drv,
222 sch ? &sch->dev : NULL, NULL,
223 chsc_subchannel_match_next_free);
224 return dev ? to_subchannel(dev) : NULL;
228 * chsc_async() - try to start a chsc request asynchronously
229 * @chsc_area: request to be started
230 * @request: request structure to associate
232 * Tries to start a chsc request on one of the existing chsc subchannels.
234 * %0 if the request was performed synchronously
235 * %-EINPROGRESS if the request was successfully started
236 * %-EBUSY if all chsc subchannels are busy
237 * %-ENODEV if no chsc subchannels are available
239 * interrupts disabled, chsc_lock held
241 static int chsc_async(struct chsc_async_area *chsc_area,
242 struct chsc_request *request)
245 struct chsc_private *private;
246 struct subchannel *sch = NULL;
250 chsc_area->header.key = PAGE_DEFAULT_KEY >> 4;
251 while ((sch = chsc_get_next_subchannel(sch))) {
252 spin_lock(sch->lock);
253 private = dev_get_drvdata(&sch->dev);
254 if (private->request) {
255 spin_unlock(sch->lock);
259 chsc_area->header.sid = sch->schid;
260 CHSC_LOG(2, "schid");
261 CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid));
262 cc = chsc(chsc_area);
263 snprintf(dbf, sizeof(dbf), "cc:%d", cc);
270 sch->schib.scsw.cmd.fctl |= SCSW_FCTL_START_FUNC;
272 private->request = request;
280 spin_unlock(sch->lock);
281 CHSC_MSG(2, "chsc on 0.%x.%04x returned cc=%d\n",
282 sch->schid.ssid, sch->schid.sch_no, cc);
283 if (ret == -EINPROGRESS)
285 put_device(&sch->dev);
292 static void chsc_log_command(void *chsc_area)
296 snprintf(dbf, sizeof(dbf), "CHSC:%x", ((uint16_t *)chsc_area)[1]);
298 CHSC_LOG_HEX(0, chsc_area, 32);
301 static int chsc_examine_irb(struct chsc_request *request)
305 if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND))
307 backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK;
308 request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK;
309 if (scsw_cstat(&request->irb.scsw) == 0)
313 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROG_CHECK)
315 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROT_CHECK)
317 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_DATA_CHK)
319 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_CTRL_CHK)
324 static int chsc_ioctl_start(void __user *user_area)
326 struct chsc_request *request;
327 struct chsc_async_area *chsc_area;
331 if (!css_general_characteristics.dynio)
332 /* It makes no sense to try. */
334 chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
337 request = kzalloc(sizeof(*request), GFP_KERNEL);
342 init_completion(&request->completion);
343 if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
347 chsc_log_command(chsc_area);
348 spin_lock_irq(&chsc_lock);
349 ret = chsc_async(chsc_area, request);
350 spin_unlock_irq(&chsc_lock);
351 if (ret == -EINPROGRESS) {
352 wait_for_completion(&request->completion);
353 ret = chsc_examine_irb(request);
355 /* copy area back to user */
357 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
360 snprintf(dbf, sizeof(dbf), "ret:%d", ret);
363 free_page((unsigned long)chsc_area);
367 static int chsc_ioctl_on_close_set(void __user *user_area)
372 mutex_lock(&on_close_mutex);
373 if (on_close_chsc_area) {
377 on_close_request = kzalloc(sizeof(*on_close_request), GFP_KERNEL);
378 if (!on_close_request) {
382 on_close_chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
383 if (!on_close_chsc_area) {
385 goto out_free_request;
387 if (copy_from_user(on_close_chsc_area, user_area, PAGE_SIZE)) {
395 free_page((unsigned long)on_close_chsc_area);
396 on_close_chsc_area = NULL;
398 kfree(on_close_request);
399 on_close_request = NULL;
401 mutex_unlock(&on_close_mutex);
402 snprintf(dbf, sizeof(dbf), "ocsret:%d", ret);
407 static int chsc_ioctl_on_close_remove(void)
412 mutex_lock(&on_close_mutex);
413 if (!on_close_chsc_area) {
417 free_page((unsigned long)on_close_chsc_area);
418 on_close_chsc_area = NULL;
419 kfree(on_close_request);
420 on_close_request = NULL;
423 mutex_unlock(&on_close_mutex);
424 snprintf(dbf, sizeof(dbf), "ocrret:%d", ret);
429 static int chsc_ioctl_start_sync(void __user *user_area)
431 struct chsc_sync_area *chsc_area;
434 chsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
437 if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
441 if (chsc_area->header.code & 0x4000) {
445 chsc_log_command(chsc_area);
446 ccode = chsc(chsc_area);
451 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
456 free_page((unsigned long)chsc_area);
460 static int chsc_ioctl_info_channel_path(void __user *user_cd)
462 struct chsc_chp_cd *cd;
465 struct chsc_header request;
476 struct chsc_header response;
477 u8 data[PAGE_SIZE - 20];
478 } __attribute__ ((packed)) *scpcd_area;
480 scpcd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
483 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
488 if (copy_from_user(cd, user_cd, sizeof(*cd))) {
492 scpcd_area->request.length = 0x0010;
493 scpcd_area->request.code = 0x0028;
494 scpcd_area->m = cd->m;
495 scpcd_area->fmt1 = cd->fmt;
496 scpcd_area->cssid = cd->chpid.cssid;
497 scpcd_area->first_chpid = cd->chpid.id;
498 scpcd_area->last_chpid = cd->chpid.id;
500 ccode = chsc(scpcd_area);
505 if (scpcd_area->response.code != 0x0001) {
507 CHSC_MSG(0, "scpcd: response code=%x\n",
508 scpcd_area->response.code);
511 memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
512 if (copy_to_user(user_cd, cd, sizeof(*cd)))
518 free_page((unsigned long)scpcd_area);
522 static int chsc_ioctl_info_cu(void __user *user_cd)
524 struct chsc_cu_cd *cd;
527 struct chsc_header request;
538 struct chsc_header response;
539 u8 data[PAGE_SIZE - 20];
540 } __attribute__ ((packed)) *scucd_area;
542 scucd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
545 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
550 if (copy_from_user(cd, user_cd, sizeof(*cd))) {
554 scucd_area->request.length = 0x0010;
555 scucd_area->request.code = 0x0026;
556 scucd_area->m = cd->m;
557 scucd_area->fmt1 = cd->fmt;
558 scucd_area->cssid = cd->cssid;
559 scucd_area->first_cun = cd->cun;
560 scucd_area->last_cun = cd->cun;
562 ccode = chsc(scucd_area);
567 if (scucd_area->response.code != 0x0001) {
569 CHSC_MSG(0, "scucd: response code=%x\n",
570 scucd_area->response.code);
573 memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length);
574 if (copy_to_user(user_cd, cd, sizeof(*cd)))
580 free_page((unsigned long)scucd_area);
584 static int chsc_ioctl_info_sch_cu(void __user *user_cud)
586 struct chsc_sch_cud *cud;
589 struct chsc_header request;
601 struct chsc_header response;
602 u8 data[PAGE_SIZE - 20];
603 } __attribute__ ((packed)) *sscud_area;
605 sscud_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
608 cud = kzalloc(sizeof(*cud), GFP_KERNEL);
613 if (copy_from_user(cud, user_cud, sizeof(*cud))) {
617 sscud_area->request.length = 0x0010;
618 sscud_area->request.code = 0x0006;
619 sscud_area->m = cud->schid.m;
620 sscud_area->fmt1 = cud->fmt;
621 sscud_area->ssid = cud->schid.ssid;
622 sscud_area->first_sch = cud->schid.sch_no;
623 sscud_area->cssid = cud->schid.cssid;
624 sscud_area->last_sch = cud->schid.sch_no;
626 ccode = chsc(sscud_area);
631 if (sscud_area->response.code != 0x0001) {
633 CHSC_MSG(0, "sscud: response code=%x\n",
634 sscud_area->response.code);
637 memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
638 if (copy_to_user(user_cud, cud, sizeof(*cud)))
644 free_page((unsigned long)sscud_area);
648 static int chsc_ioctl_conf_info(void __user *user_ci)
650 struct chsc_conf_info *ci;
653 struct chsc_header request;
663 struct chsc_header response;
664 u8 data[PAGE_SIZE - 20];
665 } __attribute__ ((packed)) *sci_area;
667 sci_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
670 ci = kzalloc(sizeof(*ci), GFP_KERNEL);
675 if (copy_from_user(ci, user_ci, sizeof(*ci))) {
679 sci_area->request.length = 0x0010;
680 sci_area->request.code = 0x0012;
681 sci_area->m = ci->id.m;
682 sci_area->fmt1 = ci->fmt;
683 sci_area->cssid = ci->id.cssid;
684 sci_area->ssid = ci->id.ssid;
686 ccode = chsc(sci_area);
691 if (sci_area->response.code != 0x0001) {
693 CHSC_MSG(0, "sci: response code=%x\n",
694 sci_area->response.code);
697 memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
698 if (copy_to_user(user_ci, ci, sizeof(*ci)))
704 free_page((unsigned long)sci_area);
708 static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
710 struct chsc_comp_list *ccl;
713 struct chsc_header request;
721 struct chsc_header response;
722 u8 data[PAGE_SIZE - 36];
723 } __attribute__ ((packed)) *sccl_area;
730 } __attribute__ ((packed)) *chpid_parm;
736 } __attribute__ ((packed)) *cssids_parm;
738 sccl_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
741 ccl = kzalloc(sizeof(*ccl), GFP_KERNEL);
746 if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {
750 sccl_area->request.length = 0x0020;
751 sccl_area->request.code = 0x0030;
752 sccl_area->fmt = ccl->req.fmt;
753 sccl_area->ctype = ccl->req.ctype;
754 switch (sccl_area->ctype) {
757 chpid_parm = (void *)&sccl_area->list_parm;
758 chpid_parm->m = ccl->req.chpid.m;
759 chpid_parm->cssid = ccl->req.chpid.chp.cssid;
760 chpid_parm->chpid = ccl->req.chpid.chp.id;
763 case CCL_CSS_IMG_CONF_CHAR:
764 cssids_parm = (void *)&sccl_area->list_parm;
765 cssids_parm->f_cssid = ccl->req.cssids.f_cssid;
766 cssids_parm->l_cssid = ccl->req.cssids.l_cssid;
769 ccode = chsc(sccl_area);
774 if (sccl_area->response.code != 0x0001) {
776 CHSC_MSG(0, "sccl: response code=%x\n",
777 sccl_area->response.code);
780 memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
781 if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
787 free_page((unsigned long)sccl_area);
791 static int chsc_ioctl_chpd(void __user *user_chpd)
793 struct chsc_scpd *scpd_area;
794 struct chsc_cpd_info *chpd;
797 chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
798 scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
799 if (!scpd_area || !chpd) {
803 if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
807 ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
808 chpd->rfmt, chpd->c, chpd->m,
812 memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length);
813 if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
817 free_page((unsigned long)scpd_area);
821 static int chsc_ioctl_dcal(void __user *user_dcal)
823 struct chsc_dcal *dcal;
826 struct chsc_header request;
834 struct chsc_header response;
835 u8 data[PAGE_SIZE - 36];
836 } __attribute__ ((packed)) *sdcal_area;
838 sdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
841 dcal = kzalloc(sizeof(*dcal), GFP_KERNEL);
846 if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
850 sdcal_area->request.length = 0x0020;
851 sdcal_area->request.code = 0x0034;
852 sdcal_area->atype = dcal->req.atype;
853 sdcal_area->fmt = dcal->req.fmt;
854 memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
855 sizeof(sdcal_area->list_parm));
857 ccode = chsc(sdcal_area);
862 if (sdcal_area->response.code != 0x0001) {
864 CHSC_MSG(0, "sdcal: response code=%x\n",
865 sdcal_area->response.code);
868 memcpy(&dcal->sdcal, &sdcal_area->response,
869 sdcal_area->response.length);
870 if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
876 free_page((unsigned long)sdcal_area);
880 static long chsc_ioctl(struct file *filp, unsigned int cmd,
885 CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
886 if (is_compat_task())
887 argp = compat_ptr(arg);
889 argp = (void __user *)arg;
892 return chsc_ioctl_start(argp);
893 case CHSC_START_SYNC:
894 return chsc_ioctl_start_sync(argp);
895 case CHSC_INFO_CHANNEL_PATH:
896 return chsc_ioctl_info_channel_path(argp);
898 return chsc_ioctl_info_cu(argp);
899 case CHSC_INFO_SCH_CU:
900 return chsc_ioctl_info_sch_cu(argp);
902 return chsc_ioctl_conf_info(argp);
904 return chsc_ioctl_conf_comp_list(argp);
906 return chsc_ioctl_chpd(argp);
908 return chsc_ioctl_dcal(argp);
909 case CHSC_ON_CLOSE_SET:
910 return chsc_ioctl_on_close_set(argp);
911 case CHSC_ON_CLOSE_REMOVE:
912 return chsc_ioctl_on_close_remove();
913 default: /* unknown ioctl number */
918 static atomic_t chsc_ready_for_use = ATOMIC_INIT(1);
920 static int chsc_open(struct inode *inode, struct file *file)
922 if (!atomic_dec_and_test(&chsc_ready_for_use)) {
923 atomic_inc(&chsc_ready_for_use);
926 return nonseekable_open(inode, file);
929 static int chsc_release(struct inode *inode, struct file *filp)
934 mutex_lock(&on_close_mutex);
935 if (!on_close_chsc_area)
937 init_completion(&on_close_request->completion);
938 CHSC_LOG(0, "on_close");
939 chsc_log_command(on_close_chsc_area);
940 spin_lock_irq(&chsc_lock);
941 ret = chsc_async(on_close_chsc_area, on_close_request);
942 spin_unlock_irq(&chsc_lock);
943 if (ret == -EINPROGRESS) {
944 wait_for_completion(&on_close_request->completion);
945 ret = chsc_examine_irb(on_close_request);
947 snprintf(dbf, sizeof(dbf), "relret:%d", ret);
949 free_page((unsigned long)on_close_chsc_area);
950 on_close_chsc_area = NULL;
951 kfree(on_close_request);
952 on_close_request = NULL;
954 mutex_unlock(&on_close_mutex);
955 atomic_inc(&chsc_ready_for_use);
959 static const struct file_operations chsc_fops = {
960 .owner = THIS_MODULE,
962 .release = chsc_release,
963 .unlocked_ioctl = chsc_ioctl,
964 .compat_ioctl = chsc_ioctl,
968 static struct miscdevice chsc_misc_device = {
969 .minor = MISC_DYNAMIC_MINOR,
974 static int __init chsc_misc_init(void)
976 return misc_register(&chsc_misc_device);
979 static void chsc_misc_cleanup(void)
981 misc_deregister(&chsc_misc_device);
984 static int __init chsc_sch_init(void)
988 ret = chsc_init_dbfs();
991 isc_register(CHSC_SCH_ISC);
992 ret = chsc_init_sch_driver();
995 ret = chsc_misc_init();
1000 chsc_cleanup_sch_driver();
1002 isc_unregister(CHSC_SCH_ISC);
1007 static void __exit chsc_sch_exit(void)
1009 chsc_misc_cleanup();
1010 chsc_cleanup_sch_driver();
1011 isc_unregister(CHSC_SCH_ISC);
1015 module_init(chsc_sch_init);
1016 module_exit(chsc_sch_exit);