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 = (struct irb *)&S390_lowcore.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_err(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", 16, 1,
178 if (!chsc_debug_msg_id)
180 debug_register_view(chsc_debug_msg_id, &debug_sprintf_view);
181 debug_set_level(chsc_debug_msg_id, 2);
182 chsc_debug_log_id = debug_register("chsc_log", 16, 1, 16);
183 if (!chsc_debug_log_id)
185 debug_register_view(chsc_debug_log_id, &debug_hex_ascii_view);
186 debug_set_level(chsc_debug_log_id, 2);
189 if (chsc_debug_msg_id)
190 debug_unregister(chsc_debug_msg_id);
194 static void chsc_remove_dbfs(void)
196 debug_unregister(chsc_debug_log_id);
197 debug_unregister(chsc_debug_msg_id);
200 static int __init chsc_init_sch_driver(void)
202 return css_driver_register(&chsc_subchannel_driver);
205 static void chsc_cleanup_sch_driver(void)
207 css_driver_unregister(&chsc_subchannel_driver);
210 static DEFINE_SPINLOCK(chsc_lock);
212 static int chsc_subchannel_match_next_free(struct device *dev, void *data)
214 struct subchannel *sch = to_subchannel(dev);
216 return sch->schib.pmcw.ena && !scsw_fctl(&sch->schib.scsw);
219 static struct subchannel *chsc_get_next_subchannel(struct subchannel *sch)
223 dev = driver_find_device(&chsc_subchannel_driver.drv,
224 sch ? &sch->dev : NULL, NULL,
225 chsc_subchannel_match_next_free);
226 return dev ? to_subchannel(dev) : NULL;
230 * chsc_async() - try to start a chsc request asynchronously
231 * @chsc_area: request to be started
232 * @request: request structure to associate
234 * Tries to start a chsc request on one of the existing chsc subchannels.
236 * %0 if the request was performed synchronously
237 * %-EINPROGRESS if the request was successfully started
238 * %-EBUSY if all chsc subchannels are busy
239 * %-ENODEV if no chsc subchannels are available
241 * interrupts disabled, chsc_lock held
243 static int chsc_async(struct chsc_async_area *chsc_area,
244 struct chsc_request *request)
247 struct chsc_private *private;
248 struct subchannel *sch = NULL;
252 chsc_area->header.key = PAGE_DEFAULT_KEY >> 4;
253 while ((sch = chsc_get_next_subchannel(sch))) {
254 spin_lock(sch->lock);
255 private = dev_get_drvdata(&sch->dev);
256 if (private->request) {
257 spin_unlock(sch->lock);
261 chsc_area->header.sid = sch->schid;
262 CHSC_LOG(2, "schid");
263 CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid));
264 cc = chsc(chsc_area);
265 snprintf(dbf, sizeof(dbf), "cc:%d", cc);
272 sch->schib.scsw.cmd.fctl |= SCSW_FCTL_START_FUNC;
274 private->request = request;
282 spin_unlock(sch->lock);
283 CHSC_MSG(2, "chsc on 0.%x.%04x returned cc=%d\n",
284 sch->schid.ssid, sch->schid.sch_no, cc);
285 if (ret == -EINPROGRESS)
287 put_device(&sch->dev);
294 static void chsc_log_command(void *chsc_area)
298 snprintf(dbf, sizeof(dbf), "CHSC:%x", ((uint16_t *)chsc_area)[1]);
300 CHSC_LOG_HEX(0, chsc_area, 32);
303 static int chsc_examine_irb(struct chsc_request *request)
307 if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND))
309 backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK;
310 request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK;
311 if (scsw_cstat(&request->irb.scsw) == 0)
315 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROG_CHECK)
317 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROT_CHECK)
319 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_DATA_CHK)
321 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_CTRL_CHK)
326 static int chsc_ioctl_start(void __user *user_area)
328 struct chsc_request *request;
329 struct chsc_async_area *chsc_area;
333 if (!css_general_characteristics.dynio)
334 /* It makes no sense to try. */
336 chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
339 request = kzalloc(sizeof(*request), GFP_KERNEL);
344 init_completion(&request->completion);
345 if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
349 chsc_log_command(chsc_area);
350 spin_lock_irq(&chsc_lock);
351 ret = chsc_async(chsc_area, request);
352 spin_unlock_irq(&chsc_lock);
353 if (ret == -EINPROGRESS) {
354 wait_for_completion(&request->completion);
355 ret = chsc_examine_irb(request);
357 /* copy area back to user */
359 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
362 snprintf(dbf, sizeof(dbf), "ret:%d", ret);
365 free_page((unsigned long)chsc_area);
369 static int chsc_ioctl_on_close_set(void __user *user_area)
374 mutex_lock(&on_close_mutex);
375 if (on_close_chsc_area) {
379 on_close_request = kzalloc(sizeof(*on_close_request), GFP_KERNEL);
380 if (!on_close_request) {
384 on_close_chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
385 if (!on_close_chsc_area) {
387 goto out_free_request;
389 if (copy_from_user(on_close_chsc_area, user_area, PAGE_SIZE)) {
397 free_page((unsigned long)on_close_chsc_area);
398 on_close_chsc_area = NULL;
400 kfree(on_close_request);
401 on_close_request = NULL;
403 mutex_unlock(&on_close_mutex);
404 snprintf(dbf, sizeof(dbf), "ocsret:%d", ret);
409 static int chsc_ioctl_on_close_remove(void)
414 mutex_lock(&on_close_mutex);
415 if (!on_close_chsc_area) {
419 free_page((unsigned long)on_close_chsc_area);
420 on_close_chsc_area = NULL;
421 kfree(on_close_request);
422 on_close_request = NULL;
425 mutex_unlock(&on_close_mutex);
426 snprintf(dbf, sizeof(dbf), "ocrret:%d", ret);
431 static int chsc_ioctl_start_sync(void __user *user_area)
433 struct chsc_sync_area *chsc_area;
436 chsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
439 if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
443 if (chsc_area->header.code & 0x4000) {
447 chsc_log_command(chsc_area);
448 ccode = chsc(chsc_area);
453 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
458 free_page((unsigned long)chsc_area);
462 static int chsc_ioctl_info_channel_path(void __user *user_cd)
464 struct chsc_chp_cd *cd;
467 struct chsc_header request;
478 struct chsc_header response;
479 u8 data[PAGE_SIZE - 20];
480 } __attribute__ ((packed)) *scpcd_area;
482 scpcd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
485 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
490 if (copy_from_user(cd, user_cd, sizeof(*cd))) {
494 scpcd_area->request.length = 0x0010;
495 scpcd_area->request.code = 0x0028;
496 scpcd_area->m = cd->m;
497 scpcd_area->fmt1 = cd->fmt;
498 scpcd_area->cssid = cd->chpid.cssid;
499 scpcd_area->first_chpid = cd->chpid.id;
500 scpcd_area->last_chpid = cd->chpid.id;
502 ccode = chsc(scpcd_area);
507 if (scpcd_area->response.code != 0x0001) {
509 CHSC_MSG(0, "scpcd: response code=%x\n",
510 scpcd_area->response.code);
513 memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
514 if (copy_to_user(user_cd, cd, sizeof(*cd)))
520 free_page((unsigned long)scpcd_area);
524 static int chsc_ioctl_info_cu(void __user *user_cd)
526 struct chsc_cu_cd *cd;
529 struct chsc_header request;
540 struct chsc_header response;
541 u8 data[PAGE_SIZE - 20];
542 } __attribute__ ((packed)) *scucd_area;
544 scucd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
547 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
552 if (copy_from_user(cd, user_cd, sizeof(*cd))) {
556 scucd_area->request.length = 0x0010;
557 scucd_area->request.code = 0x0028;
558 scucd_area->m = cd->m;
559 scucd_area->fmt1 = cd->fmt;
560 scucd_area->cssid = cd->cssid;
561 scucd_area->first_cun = cd->cun;
562 scucd_area->last_cun = cd->cun;
564 ccode = chsc(scucd_area);
569 if (scucd_area->response.code != 0x0001) {
571 CHSC_MSG(0, "scucd: response code=%x\n",
572 scucd_area->response.code);
575 memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length);
576 if (copy_to_user(user_cd, cd, sizeof(*cd)))
582 free_page((unsigned long)scucd_area);
586 static int chsc_ioctl_info_sch_cu(void __user *user_cud)
588 struct chsc_sch_cud *cud;
591 struct chsc_header request;
603 struct chsc_header response;
604 u8 data[PAGE_SIZE - 20];
605 } __attribute__ ((packed)) *sscud_area;
607 sscud_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
610 cud = kzalloc(sizeof(*cud), GFP_KERNEL);
615 if (copy_from_user(cud, user_cud, sizeof(*cud))) {
619 sscud_area->request.length = 0x0010;
620 sscud_area->request.code = 0x0006;
621 sscud_area->m = cud->schid.m;
622 sscud_area->fmt1 = cud->fmt;
623 sscud_area->ssid = cud->schid.ssid;
624 sscud_area->first_sch = cud->schid.sch_no;
625 sscud_area->cssid = cud->schid.cssid;
626 sscud_area->last_sch = cud->schid.sch_no;
628 ccode = chsc(sscud_area);
633 if (sscud_area->response.code != 0x0001) {
635 CHSC_MSG(0, "sscud: response code=%x\n",
636 sscud_area->response.code);
639 memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
640 if (copy_to_user(user_cud, cud, sizeof(*cud)))
646 free_page((unsigned long)sscud_area);
650 static int chsc_ioctl_conf_info(void __user *user_ci)
652 struct chsc_conf_info *ci;
655 struct chsc_header request;
665 struct chsc_header response;
666 u8 data[PAGE_SIZE - 20];
667 } __attribute__ ((packed)) *sci_area;
669 sci_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
672 ci = kzalloc(sizeof(*ci), GFP_KERNEL);
677 if (copy_from_user(ci, user_ci, sizeof(*ci))) {
681 sci_area->request.length = 0x0010;
682 sci_area->request.code = 0x0012;
683 sci_area->m = ci->id.m;
684 sci_area->fmt1 = ci->fmt;
685 sci_area->cssid = ci->id.cssid;
686 sci_area->ssid = ci->id.ssid;
688 ccode = chsc(sci_area);
693 if (sci_area->response.code != 0x0001) {
695 CHSC_MSG(0, "sci: response code=%x\n",
696 sci_area->response.code);
699 memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
700 if (copy_to_user(user_ci, ci, sizeof(*ci)))
706 free_page((unsigned long)sci_area);
710 static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
712 struct chsc_comp_list *ccl;
715 struct chsc_header request;
723 struct chsc_header response;
724 u8 data[PAGE_SIZE - 36];
725 } __attribute__ ((packed)) *sccl_area;
732 } __attribute__ ((packed)) *chpid_parm;
738 } __attribute__ ((packed)) *cssids_parm;
740 sccl_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
743 ccl = kzalloc(sizeof(*ccl), GFP_KERNEL);
748 if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {
752 sccl_area->request.length = 0x0020;
753 sccl_area->request.code = 0x0030;
754 sccl_area->fmt = ccl->req.fmt;
755 sccl_area->ctype = ccl->req.ctype;
756 switch (sccl_area->ctype) {
759 chpid_parm = (void *)&sccl_area->list_parm;
760 chpid_parm->m = ccl->req.chpid.m;
761 chpid_parm->cssid = ccl->req.chpid.chp.cssid;
762 chpid_parm->chpid = ccl->req.chpid.chp.id;
765 case CCL_CSS_IMG_CONF_CHAR:
766 cssids_parm = (void *)&sccl_area->list_parm;
767 cssids_parm->f_cssid = ccl->req.cssids.f_cssid;
768 cssids_parm->l_cssid = ccl->req.cssids.l_cssid;
771 ccode = chsc(sccl_area);
776 if (sccl_area->response.code != 0x0001) {
778 CHSC_MSG(0, "sccl: response code=%x\n",
779 sccl_area->response.code);
782 memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
783 if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
789 free_page((unsigned long)sccl_area);
793 static int chsc_ioctl_chpd(void __user *user_chpd)
795 struct chsc_scpd *scpd_area;
796 struct chsc_cpd_info *chpd;
799 chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
800 scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
801 if (!scpd_area || !chpd) {
805 if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
809 ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
810 chpd->rfmt, chpd->c, chpd->m,
814 memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length);
815 if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
819 free_page((unsigned long)scpd_area);
823 static int chsc_ioctl_dcal(void __user *user_dcal)
825 struct chsc_dcal *dcal;
828 struct chsc_header request;
836 struct chsc_header response;
837 u8 data[PAGE_SIZE - 36];
838 } __attribute__ ((packed)) *sdcal_area;
840 sdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
843 dcal = kzalloc(sizeof(*dcal), GFP_KERNEL);
848 if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
852 sdcal_area->request.length = 0x0020;
853 sdcal_area->request.code = 0x0034;
854 sdcal_area->atype = dcal->req.atype;
855 sdcal_area->fmt = dcal->req.fmt;
856 memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
857 sizeof(sdcal_area->list_parm));
859 ccode = chsc(sdcal_area);
864 if (sdcal_area->response.code != 0x0001) {
866 CHSC_MSG(0, "sdcal: response code=%x\n",
867 sdcal_area->response.code);
870 memcpy(&dcal->sdcal, &sdcal_area->response,
871 sdcal_area->response.length);
872 if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
878 free_page((unsigned long)sdcal_area);
882 static long chsc_ioctl(struct file *filp, unsigned int cmd,
887 CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
888 if (is_compat_task())
889 argp = compat_ptr(arg);
891 argp = (void __user *)arg;
894 return chsc_ioctl_start(argp);
895 case CHSC_START_SYNC:
896 return chsc_ioctl_start_sync(argp);
897 case CHSC_INFO_CHANNEL_PATH:
898 return chsc_ioctl_info_channel_path(argp);
900 return chsc_ioctl_info_cu(argp);
901 case CHSC_INFO_SCH_CU:
902 return chsc_ioctl_info_sch_cu(argp);
904 return chsc_ioctl_conf_info(argp);
906 return chsc_ioctl_conf_comp_list(argp);
908 return chsc_ioctl_chpd(argp);
910 return chsc_ioctl_dcal(argp);
911 case CHSC_ON_CLOSE_SET:
912 return chsc_ioctl_on_close_set(argp);
913 case CHSC_ON_CLOSE_REMOVE:
914 return chsc_ioctl_on_close_remove();
915 default: /* unknown ioctl number */
920 static atomic_t chsc_ready_for_use = ATOMIC_INIT(1);
922 static int chsc_open(struct inode *inode, struct file *file)
924 if (!atomic_dec_and_test(&chsc_ready_for_use)) {
925 atomic_inc(&chsc_ready_for_use);
928 return nonseekable_open(inode, file);
931 static int chsc_release(struct inode *inode, struct file *filp)
936 mutex_lock(&on_close_mutex);
937 if (!on_close_chsc_area)
939 init_completion(&on_close_request->completion);
940 CHSC_LOG(0, "on_close");
941 chsc_log_command(on_close_chsc_area);
942 spin_lock_irq(&chsc_lock);
943 ret = chsc_async(on_close_chsc_area, on_close_request);
944 spin_unlock_irq(&chsc_lock);
945 if (ret == -EINPROGRESS) {
946 wait_for_completion(&on_close_request->completion);
947 ret = chsc_examine_irb(on_close_request);
949 snprintf(dbf, sizeof(dbf), "relret:%d", ret);
951 free_page((unsigned long)on_close_chsc_area);
952 on_close_chsc_area = NULL;
953 kfree(on_close_request);
954 on_close_request = NULL;
956 mutex_unlock(&on_close_mutex);
957 atomic_inc(&chsc_ready_for_use);
961 static const struct file_operations chsc_fops = {
962 .owner = THIS_MODULE,
964 .release = chsc_release,
965 .unlocked_ioctl = chsc_ioctl,
966 .compat_ioctl = chsc_ioctl,
970 static struct miscdevice chsc_misc_device = {
971 .minor = MISC_DYNAMIC_MINOR,
976 static int __init chsc_misc_init(void)
978 return misc_register(&chsc_misc_device);
981 static void chsc_misc_cleanup(void)
983 misc_deregister(&chsc_misc_device);
986 static int __init chsc_sch_init(void)
990 ret = chsc_init_dbfs();
993 isc_register(CHSC_SCH_ISC);
994 ret = chsc_init_sch_driver();
997 ret = chsc_misc_init();
1002 chsc_cleanup_sch_driver();
1004 isc_unregister(CHSC_SCH_ISC);
1009 static void __exit chsc_sch_exit(void)
1011 chsc_misc_cleanup();
1012 chsc_cleanup_sch_driver();
1013 isc_unregister(CHSC_SCH_ISC);
1017 module_init(chsc_sch_init);
1018 module_exit(chsc_sch_exit);