1 // SPDX-License-Identifier: GPL-2.0
3 * Driver for s390 chsc subchannels
5 * Copyright IBM Corp. 2008, 2011
7 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
11 #include <linux/slab.h>
12 #include <linux/compat.h>
13 #include <linux/device.h>
14 #include <linux/module.h>
15 #include <linux/uaccess.h>
16 #include <linux/miscdevice.h>
17 #include <linux/kernel_stat.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)
46 debug_event(chsc_debug_log_id, level, data, length);
49 MODULE_AUTHOR("IBM Corporation");
50 MODULE_DESCRIPTION("driver for s390 chsc subchannels");
51 MODULE_LICENSE("GPL");
53 static void chsc_subchannel_irq(struct subchannel *sch)
55 struct chsc_private *private = dev_get_drvdata(&sch->dev);
56 struct chsc_request *request = private->request;
57 struct irb *irb = this_cpu_ptr(&cio_irb);
60 CHSC_LOG_HEX(4, irb, sizeof(*irb));
61 inc_irq_stat(IRQIO_CSC);
63 /* Copy irb to provided request and set done. */
65 CHSC_MSG(0, "Interrupt on sch 0.%x.%04x with no request\n",
66 sch->schid.ssid, sch->schid.sch_no);
69 private->request = NULL;
70 memcpy(&request->irb, irb, sizeof(*irb));
71 cio_update_schib(sch);
72 complete(&request->completion);
73 put_device(&sch->dev);
76 static int chsc_subchannel_probe(struct subchannel *sch)
78 struct chsc_private *private;
81 CHSC_MSG(6, "Detected chsc subchannel 0.%x.%04x\n",
82 sch->schid.ssid, sch->schid.sch_no);
83 sch->isc = CHSC_SCH_ISC;
84 private = kzalloc(sizeof(*private), GFP_KERNEL);
87 dev_set_drvdata(&sch->dev, private);
88 ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch);
90 CHSC_MSG(0, "Failed to enable 0.%x.%04x: %d\n",
91 sch->schid.ssid, sch->schid.sch_no, ret);
92 dev_set_drvdata(&sch->dev, NULL);
98 static void chsc_subchannel_remove(struct subchannel *sch)
100 struct chsc_private *private;
102 cio_disable_subchannel(sch);
103 private = dev_get_drvdata(&sch->dev);
104 dev_set_drvdata(&sch->dev, NULL);
105 if (private->request) {
106 complete(&private->request->completion);
107 put_device(&sch->dev);
112 static void chsc_subchannel_shutdown(struct subchannel *sch)
114 cio_disable_subchannel(sch);
117 static struct css_device_id chsc_subchannel_ids[] = {
118 { .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, },
119 { /* end of list */ },
121 MODULE_DEVICE_TABLE(css, chsc_subchannel_ids);
123 static struct css_driver chsc_subchannel_driver = {
125 .owner = THIS_MODULE,
126 .name = "chsc_subchannel",
128 .subchannel_type = chsc_subchannel_ids,
129 .irq = chsc_subchannel_irq,
130 .probe = chsc_subchannel_probe,
131 .remove = chsc_subchannel_remove,
132 .shutdown = chsc_subchannel_shutdown,
135 static int __init chsc_init_dbfs(void)
137 chsc_debug_msg_id = debug_register("chsc_msg", 8, 1, 4 * sizeof(long));
138 if (!chsc_debug_msg_id)
140 debug_register_view(chsc_debug_msg_id, &debug_sprintf_view);
141 debug_set_level(chsc_debug_msg_id, 2);
142 chsc_debug_log_id = debug_register("chsc_log", 16, 1, 16);
143 if (!chsc_debug_log_id)
145 debug_register_view(chsc_debug_log_id, &debug_hex_ascii_view);
146 debug_set_level(chsc_debug_log_id, 2);
149 debug_unregister(chsc_debug_msg_id);
153 static void chsc_remove_dbfs(void)
155 debug_unregister(chsc_debug_log_id);
156 debug_unregister(chsc_debug_msg_id);
159 static int __init chsc_init_sch_driver(void)
161 return css_driver_register(&chsc_subchannel_driver);
164 static void chsc_cleanup_sch_driver(void)
166 css_driver_unregister(&chsc_subchannel_driver);
169 static DEFINE_SPINLOCK(chsc_lock);
171 static int chsc_subchannel_match_next_free(struct device *dev, const void *data)
173 struct subchannel *sch = to_subchannel(dev);
175 return sch->schib.pmcw.ena && !scsw_fctl(&sch->schib.scsw);
178 static struct subchannel *chsc_get_next_subchannel(struct subchannel *sch)
182 dev = driver_find_device(&chsc_subchannel_driver.drv,
183 sch ? &sch->dev : NULL, NULL,
184 chsc_subchannel_match_next_free);
185 return dev ? to_subchannel(dev) : NULL;
189 * chsc_async() - try to start a chsc request asynchronously
190 * @chsc_area: request to be started
191 * @request: request structure to associate
193 * Tries to start a chsc request on one of the existing chsc subchannels.
195 * %0 if the request was performed synchronously
196 * %-EINPROGRESS if the request was successfully started
197 * %-EBUSY if all chsc subchannels are busy
198 * %-ENODEV if no chsc subchannels are available
200 * interrupts disabled, chsc_lock held
202 static int chsc_async(struct chsc_async_area *chsc_area,
203 struct chsc_request *request)
206 struct chsc_private *private;
207 struct subchannel *sch = NULL;
211 chsc_area->header.key = PAGE_DEFAULT_KEY >> 4;
212 while ((sch = chsc_get_next_subchannel(sch))) {
213 spin_lock(sch->lock);
214 private = dev_get_drvdata(&sch->dev);
215 if (private->request) {
216 spin_unlock(sch->lock);
220 chsc_area->header.sid = sch->schid;
221 CHSC_LOG(2, "schid");
222 CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid));
223 cc = chsc(chsc_area);
224 snprintf(dbf, sizeof(dbf), "cc:%d", cc);
231 sch->schib.scsw.cmd.fctl |= SCSW_FCTL_START_FUNC;
233 private->request = request;
241 spin_unlock(sch->lock);
242 CHSC_MSG(2, "chsc on 0.%x.%04x returned cc=%d\n",
243 sch->schid.ssid, sch->schid.sch_no, cc);
244 if (ret == -EINPROGRESS)
246 put_device(&sch->dev);
253 static void chsc_log_command(void *chsc_area)
257 snprintf(dbf, sizeof(dbf), "CHSC:%x", ((uint16_t *)chsc_area)[1]);
259 CHSC_LOG_HEX(0, chsc_area, 32);
262 static int chsc_examine_irb(struct chsc_request *request)
266 if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND))
268 backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK;
269 request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK;
270 if (scsw_cstat(&request->irb.scsw) == 0)
274 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROG_CHECK)
276 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROT_CHECK)
278 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_DATA_CHK)
280 if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_CTRL_CHK)
285 static int chsc_ioctl_start(void __user *user_area)
287 struct chsc_request *request;
288 struct chsc_async_area *chsc_area;
292 if (!css_general_characteristics.dynio)
293 /* It makes no sense to try. */
295 chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
298 request = kzalloc(sizeof(*request), GFP_KERNEL);
303 init_completion(&request->completion);
304 if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
308 chsc_log_command(chsc_area);
309 spin_lock_irq(&chsc_lock);
310 ret = chsc_async(chsc_area, request);
311 spin_unlock_irq(&chsc_lock);
312 if (ret == -EINPROGRESS) {
313 wait_for_completion(&request->completion);
314 ret = chsc_examine_irb(request);
316 /* copy area back to user */
318 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
321 snprintf(dbf, sizeof(dbf), "ret:%d", ret);
324 free_page((unsigned long)chsc_area);
328 static int chsc_ioctl_on_close_set(void __user *user_area)
333 mutex_lock(&on_close_mutex);
334 if (on_close_chsc_area) {
338 on_close_request = kzalloc(sizeof(*on_close_request), GFP_KERNEL);
339 if (!on_close_request) {
343 on_close_chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
344 if (!on_close_chsc_area) {
346 goto out_free_request;
348 if (copy_from_user(on_close_chsc_area, user_area, PAGE_SIZE)) {
356 free_page((unsigned long)on_close_chsc_area);
357 on_close_chsc_area = NULL;
359 kfree(on_close_request);
360 on_close_request = NULL;
362 mutex_unlock(&on_close_mutex);
363 snprintf(dbf, sizeof(dbf), "ocsret:%d", ret);
368 static int chsc_ioctl_on_close_remove(void)
373 mutex_lock(&on_close_mutex);
374 if (!on_close_chsc_area) {
378 free_page((unsigned long)on_close_chsc_area);
379 on_close_chsc_area = NULL;
380 kfree(on_close_request);
381 on_close_request = NULL;
384 mutex_unlock(&on_close_mutex);
385 snprintf(dbf, sizeof(dbf), "ocrret:%d", ret);
390 static int chsc_ioctl_start_sync(void __user *user_area)
392 struct chsc_sync_area *chsc_area;
395 chsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
398 if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
402 if (chsc_area->header.code & 0x4000) {
406 chsc_log_command(chsc_area);
407 ccode = chsc(chsc_area);
412 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
417 free_page((unsigned long)chsc_area);
421 static int chsc_ioctl_info_channel_path(void __user *user_cd)
423 struct chsc_chp_cd *cd;
426 struct chsc_header request;
437 struct chsc_header response;
438 u8 data[PAGE_SIZE - 20];
439 } __attribute__ ((packed)) *scpcd_area;
441 scpcd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
444 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
449 if (copy_from_user(cd, user_cd, sizeof(*cd))) {
453 scpcd_area->request.length = 0x0010;
454 scpcd_area->request.code = 0x0028;
455 scpcd_area->m = cd->m;
456 scpcd_area->fmt1 = cd->fmt;
457 scpcd_area->cssid = cd->chpid.cssid;
458 scpcd_area->first_chpid = cd->chpid.id;
459 scpcd_area->last_chpid = cd->chpid.id;
461 ccode = chsc(scpcd_area);
466 if (scpcd_area->response.code != 0x0001) {
468 CHSC_MSG(0, "scpcd: response code=%x\n",
469 scpcd_area->response.code);
472 memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
473 if (copy_to_user(user_cd, cd, sizeof(*cd)))
479 free_page((unsigned long)scpcd_area);
483 static int chsc_ioctl_info_cu(void __user *user_cd)
485 struct chsc_cu_cd *cd;
488 struct chsc_header request;
499 struct chsc_header response;
500 u8 data[PAGE_SIZE - 20];
501 } __attribute__ ((packed)) *scucd_area;
503 scucd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
506 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
511 if (copy_from_user(cd, user_cd, sizeof(*cd))) {
515 scucd_area->request.length = 0x0010;
516 scucd_area->request.code = 0x0026;
517 scucd_area->m = cd->m;
518 scucd_area->fmt1 = cd->fmt;
519 scucd_area->cssid = cd->cssid;
520 scucd_area->first_cun = cd->cun;
521 scucd_area->last_cun = cd->cun;
523 ccode = chsc(scucd_area);
528 if (scucd_area->response.code != 0x0001) {
530 CHSC_MSG(0, "scucd: response code=%x\n",
531 scucd_area->response.code);
534 memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length);
535 if (copy_to_user(user_cd, cd, sizeof(*cd)))
541 free_page((unsigned long)scucd_area);
545 static int chsc_ioctl_info_sch_cu(void __user *user_cud)
547 struct chsc_sch_cud *cud;
550 struct chsc_header request;
562 struct chsc_header response;
563 u8 data[PAGE_SIZE - 20];
564 } __attribute__ ((packed)) *sscud_area;
566 sscud_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
569 cud = kzalloc(sizeof(*cud), GFP_KERNEL);
574 if (copy_from_user(cud, user_cud, sizeof(*cud))) {
578 sscud_area->request.length = 0x0010;
579 sscud_area->request.code = 0x0006;
580 sscud_area->m = cud->schid.m;
581 sscud_area->fmt1 = cud->fmt;
582 sscud_area->ssid = cud->schid.ssid;
583 sscud_area->first_sch = cud->schid.sch_no;
584 sscud_area->cssid = cud->schid.cssid;
585 sscud_area->last_sch = cud->schid.sch_no;
587 ccode = chsc(sscud_area);
592 if (sscud_area->response.code != 0x0001) {
594 CHSC_MSG(0, "sscud: response code=%x\n",
595 sscud_area->response.code);
598 memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
599 if (copy_to_user(user_cud, cud, sizeof(*cud)))
605 free_page((unsigned long)sscud_area);
609 static int chsc_ioctl_conf_info(void __user *user_ci)
611 struct chsc_conf_info *ci;
614 struct chsc_header request;
624 struct chsc_header response;
625 u8 data[PAGE_SIZE - 20];
626 } __attribute__ ((packed)) *sci_area;
628 sci_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
631 ci = kzalloc(sizeof(*ci), GFP_KERNEL);
636 if (copy_from_user(ci, user_ci, sizeof(*ci))) {
640 sci_area->request.length = 0x0010;
641 sci_area->request.code = 0x0012;
642 sci_area->m = ci->id.m;
643 sci_area->fmt1 = ci->fmt;
644 sci_area->cssid = ci->id.cssid;
645 sci_area->ssid = ci->id.ssid;
647 ccode = chsc(sci_area);
652 if (sci_area->response.code != 0x0001) {
654 CHSC_MSG(0, "sci: response code=%x\n",
655 sci_area->response.code);
658 memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
659 if (copy_to_user(user_ci, ci, sizeof(*ci)))
665 free_page((unsigned long)sci_area);
669 static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
671 struct chsc_comp_list *ccl;
674 struct chsc_header request;
682 struct chsc_header response;
683 u8 data[PAGE_SIZE - 36];
684 } __attribute__ ((packed)) *sccl_area;
691 } __attribute__ ((packed)) *chpid_parm;
697 } __attribute__ ((packed)) *cssids_parm;
699 sccl_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
702 ccl = kzalloc(sizeof(*ccl), GFP_KERNEL);
707 if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {
711 sccl_area->request.length = 0x0020;
712 sccl_area->request.code = 0x0030;
713 sccl_area->fmt = ccl->req.fmt;
714 sccl_area->ctype = ccl->req.ctype;
715 switch (sccl_area->ctype) {
718 chpid_parm = (void *)&sccl_area->list_parm;
719 chpid_parm->m = ccl->req.chpid.m;
720 chpid_parm->cssid = ccl->req.chpid.chp.cssid;
721 chpid_parm->chpid = ccl->req.chpid.chp.id;
724 case CCL_CSS_IMG_CONF_CHAR:
725 cssids_parm = (void *)&sccl_area->list_parm;
726 cssids_parm->f_cssid = ccl->req.cssids.f_cssid;
727 cssids_parm->l_cssid = ccl->req.cssids.l_cssid;
730 ccode = chsc(sccl_area);
735 if (sccl_area->response.code != 0x0001) {
737 CHSC_MSG(0, "sccl: response code=%x\n",
738 sccl_area->response.code);
741 memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
742 if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
748 free_page((unsigned long)sccl_area);
752 static int chsc_ioctl_chpd(void __user *user_chpd)
754 struct chsc_scpd *scpd_area;
755 struct chsc_cpd_info *chpd;
758 chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
759 scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
760 if (!scpd_area || !chpd) {
764 if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
768 ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
769 chpd->rfmt, chpd->c, chpd->m,
773 memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length);
774 if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
778 free_page((unsigned long)scpd_area);
782 static int chsc_ioctl_dcal(void __user *user_dcal)
784 struct chsc_dcal *dcal;
787 struct chsc_header request;
795 struct chsc_header response;
796 u8 data[PAGE_SIZE - 36];
797 } __attribute__ ((packed)) *sdcal_area;
799 sdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
802 dcal = kzalloc(sizeof(*dcal), GFP_KERNEL);
807 if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
811 sdcal_area->request.length = 0x0020;
812 sdcal_area->request.code = 0x0034;
813 sdcal_area->atype = dcal->req.atype;
814 sdcal_area->fmt = dcal->req.fmt;
815 memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
816 sizeof(sdcal_area->list_parm));
818 ccode = chsc(sdcal_area);
823 if (sdcal_area->response.code != 0x0001) {
825 CHSC_MSG(0, "sdcal: response code=%x\n",
826 sdcal_area->response.code);
829 memcpy(&dcal->sdcal, &sdcal_area->response,
830 sdcal_area->response.length);
831 if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
837 free_page((unsigned long)sdcal_area);
841 static long chsc_ioctl(struct file *filp, unsigned int cmd,
846 CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
847 if (is_compat_task())
848 argp = compat_ptr(arg);
850 argp = (void __user *)arg;
853 return chsc_ioctl_start(argp);
854 case CHSC_START_SYNC:
855 return chsc_ioctl_start_sync(argp);
856 case CHSC_INFO_CHANNEL_PATH:
857 return chsc_ioctl_info_channel_path(argp);
859 return chsc_ioctl_info_cu(argp);
860 case CHSC_INFO_SCH_CU:
861 return chsc_ioctl_info_sch_cu(argp);
863 return chsc_ioctl_conf_info(argp);
865 return chsc_ioctl_conf_comp_list(argp);
867 return chsc_ioctl_chpd(argp);
869 return chsc_ioctl_dcal(argp);
870 case CHSC_ON_CLOSE_SET:
871 return chsc_ioctl_on_close_set(argp);
872 case CHSC_ON_CLOSE_REMOVE:
873 return chsc_ioctl_on_close_remove();
874 default: /* unknown ioctl number */
879 static atomic_t chsc_ready_for_use = ATOMIC_INIT(1);
881 static int chsc_open(struct inode *inode, struct file *file)
883 if (!atomic_dec_and_test(&chsc_ready_for_use)) {
884 atomic_inc(&chsc_ready_for_use);
887 return nonseekable_open(inode, file);
890 static int chsc_release(struct inode *inode, struct file *filp)
895 mutex_lock(&on_close_mutex);
896 if (!on_close_chsc_area)
898 init_completion(&on_close_request->completion);
899 CHSC_LOG(0, "on_close");
900 chsc_log_command(on_close_chsc_area);
901 spin_lock_irq(&chsc_lock);
902 ret = chsc_async(on_close_chsc_area, on_close_request);
903 spin_unlock_irq(&chsc_lock);
904 if (ret == -EINPROGRESS) {
905 wait_for_completion(&on_close_request->completion);
906 ret = chsc_examine_irb(on_close_request);
908 snprintf(dbf, sizeof(dbf), "relret:%d", ret);
910 free_page((unsigned long)on_close_chsc_area);
911 on_close_chsc_area = NULL;
912 kfree(on_close_request);
913 on_close_request = NULL;
915 mutex_unlock(&on_close_mutex);
916 atomic_inc(&chsc_ready_for_use);
920 static const struct file_operations chsc_fops = {
921 .owner = THIS_MODULE,
923 .release = chsc_release,
924 .unlocked_ioctl = chsc_ioctl,
925 .compat_ioctl = chsc_ioctl,
929 static struct miscdevice chsc_misc_device = {
930 .minor = MISC_DYNAMIC_MINOR,
935 static int __init chsc_misc_init(void)
937 return misc_register(&chsc_misc_device);
940 static void chsc_misc_cleanup(void)
942 misc_deregister(&chsc_misc_device);
945 static int __init chsc_sch_init(void)
949 ret = chsc_init_dbfs();
952 isc_register(CHSC_SCH_ISC);
953 ret = chsc_init_sch_driver();
956 ret = chsc_misc_init();
961 chsc_cleanup_sch_driver();
963 isc_unregister(CHSC_SCH_ISC);
968 static void __exit chsc_sch_exit(void)
971 chsc_cleanup_sch_driver();
972 isc_unregister(CHSC_SCH_ISC);
976 module_init(chsc_sch_init);
977 module_exit(chsc_sch_exit);