2 * Author(s)......: Carsten Otte <cotte@de.ibm.com>
3 * Rob M van der Heij <rvdheij@nl.ibm.com>
4 * Steven Shultz <shultzss@us.ibm.com>
5 * Bugreports.to..: <Linux390@de.ibm.com>
6 * Copyright IBM Corp. 2002, 2004
9 #define KMSG_COMPONENT "extmem"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
12 #include <linux/kernel.h>
13 #include <linux/string.h>
14 #include <linux/spinlock.h>
15 #include <linux/list.h>
16 #include <linux/slab.h>
17 #include <linux/module.h>
18 #include <linux/bootmem.h>
19 #include <linux/ctype.h>
20 #include <linux/ioport.h>
23 #include <asm/pgtable.h>
24 #include <asm/ebcdic.h>
25 #include <asm/errno.h>
26 #include <asm/extmem.h>
27 #include <asm/cpcmd.h>
28 #include <asm/setup.h>
30 #define DCSS_LOADSHR 0x00
31 #define DCSS_LOADNSR 0x04
32 #define DCSS_PURGESEG 0x08
33 #define DCSS_FINDSEG 0x0c
34 #define DCSS_LOADNOLY 0x10
35 #define DCSS_SEGEXT 0x18
36 #define DCSS_LOADSHRX 0x20
37 #define DCSS_LOADNSRX 0x24
38 #define DCSS_FINDSEGX 0x2c
39 #define DCSS_SEGEXTX 0x38
40 #define DCSS_FINDSEGA 0x0c
43 unsigned long start; /* last byte type */
44 unsigned long end; /* last byte reserved */
48 unsigned long segstart;
52 struct qrange range[6];
56 unsigned int start; /* last byte type */
57 unsigned int end; /* last byte reserved */
60 /* output area format for the Diag x'64' old subcode x'18' */
66 struct qrange_old range[6];
80 struct list_head list;
83 unsigned long start_addr;
87 unsigned int vm_segtype;
88 struct qrange range[6];
93 static DEFINE_MUTEX(dcss_lock);
94 static LIST_HEAD(dcss_list);
95 static char *segtype_string[] = { "SW", "EW", "SR", "ER", "SN", "EN", "SC",
97 static int loadshr_scode, loadnsr_scode, findseg_scode;
98 static int segext_scode, purgeseg_scode;
101 /* set correct Diag x'64' subcodes. */
103 dcss_set_subcodes(void)
105 char *name = kmalloc(8 * sizeof(char), GFP_KERNEL | GFP_DMA);
106 unsigned long rx, ry;
112 rx = (unsigned long) name;
115 strcpy(name, "dummy");
116 diag_stat_inc(DIAG_STAT_X064);
125 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
128 /* Diag x'64' new subcodes are supported, set to new subcodes */
130 loadshr_scode = DCSS_LOADSHRX;
131 loadnsr_scode = DCSS_LOADNSRX;
132 purgeseg_scode = DCSS_PURGESEG;
133 findseg_scode = DCSS_FINDSEGX;
134 segext_scode = DCSS_SEGEXTX;
137 /* Diag x'64' new subcodes are not supported, set to old subcodes */
138 loadshr_scode = DCSS_LOADNOLY;
139 loadnsr_scode = DCSS_LOADNSR;
140 purgeseg_scode = DCSS_PURGESEG;
141 findseg_scode = DCSS_FINDSEG;
142 segext_scode = DCSS_SEGEXT;
147 * Create the 8 bytes, ebcdic VM segment name from
151 dcss_mkname(char *name, char *dcss_name)
155 for (i = 0; i < 8; i++) {
158 dcss_name[i] = toupper(name[i]);
162 ASCEBC(dcss_name, 8);
167 * search all segments in dcss_list, and return the one
168 * namend *name. If not found, return NULL.
170 static struct dcss_segment *
171 segment_by_name (char *name)
175 struct dcss_segment *tmp, *retval = NULL;
177 BUG_ON(!mutex_is_locked(&dcss_lock));
178 dcss_mkname (name, dcss_name);
179 list_for_each (l, &dcss_list) {
180 tmp = list_entry (l, struct dcss_segment, list);
181 if (memcmp(tmp->dcss_name, dcss_name, 8) == 0) {
191 * Perform a function on a dcss segment.
194 dcss_diag(int *func, void *parameter,
195 unsigned long *ret1, unsigned long *ret2)
197 unsigned long rx, ry;
200 if (scode_set == 0) {
201 rc = dcss_set_subcodes();
206 rx = (unsigned long) parameter;
207 ry = (unsigned long) *func;
209 /* 64-bit Diag x'64' new subcode, keep in 64-bit addressing mode */
210 diag_stat_inc(DIAG_STAT_X064);
211 if (*func > DCSS_SEGEXT)
216 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
217 /* 31-bit Diag x'64' old subcode, switch to 31-bit addressing mode */
225 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
232 dcss_diag_translate_rc (int vm_rc) {
239 /* do a diag to get info about a segment.
240 * fills start_address, end and vm_segtype fields
243 query_segment_type (struct dcss_segment *seg)
245 unsigned long dummy, vmrc;
250 qin = kmalloc(sizeof(*qin), GFP_KERNEL | GFP_DMA);
251 qout = kmalloc(sizeof(*qout), GFP_KERNEL | GFP_DMA);
252 if ((qin == NULL) || (qout == NULL)) {
257 /* initialize diag input parameters */
258 qin->qopcode = DCSS_FINDSEGA;
259 qin->qoutptr = (unsigned long) qout;
260 qin->qoutlen = sizeof(struct qout64);
261 memcpy (qin->qname, seg->dcss_name, 8);
263 diag_cc = dcss_diag(&segext_scode, qin, &dummy, &vmrc);
270 pr_warning("Querying a DCSS type failed with rc=%ld\n", vmrc);
271 rc = dcss_diag_translate_rc (vmrc);
275 /* Only old format of output area of Diagnose x'64' is supported,
276 copy data for the new format. */
277 if (segext_scode == DCSS_SEGEXT) {
278 struct qout64_old *qout_old;
279 qout_old = kzalloc(sizeof(*qout_old), GFP_KERNEL | GFP_DMA);
280 if (qout_old == NULL) {
284 memcpy(qout_old, qout, sizeof(struct qout64_old));
285 qout->segstart = (unsigned long) qout_old->segstart;
286 qout->segend = (unsigned long) qout_old->segend;
287 qout->segcnt = qout_old->segcnt;
288 qout->segrcnt = qout_old->segrcnt;
290 if (qout->segcnt > 6)
292 for (i = 0; i < qout->segrcnt; i++) {
293 qout->range[i].start =
294 (unsigned long) qout_old->range[i].start;
296 (unsigned long) qout_old->range[i].end;
300 if (qout->segcnt > 6) {
305 if (qout->segcnt == 1) {
306 seg->vm_segtype = qout->range[0].start & 0xff;
308 /* multi-part segment. only one type supported here:
309 - all parts are contiguous
310 - all parts are either EW or EN type
311 - maximum 6 parts allowed */
312 unsigned long start = qout->segstart >> PAGE_SHIFT;
313 for (i=0; i<qout->segcnt; i++) {
314 if (((qout->range[i].start & 0xff) != SEG_TYPE_EW) &&
315 ((qout->range[i].start & 0xff) != SEG_TYPE_EN)) {
319 if (start != qout->range[i].start >> PAGE_SHIFT) {
323 start = (qout->range[i].end >> PAGE_SHIFT) + 1;
325 seg->vm_segtype = SEG_TYPE_EWEN;
328 /* analyze diag output and update seg */
329 seg->start_addr = qout->segstart;
330 seg->end = qout->segend;
332 memcpy (seg->range, qout->range, 6*sizeof(struct qrange));
333 seg->segcnt = qout->segcnt;
344 * get info about a segment
345 * possible return values:
346 * -ENOSYS : we are not running on VM
347 * -EIO : could not perform query diagnose
348 * -ENOENT : no such segment
349 * -EOPNOTSUPP: multi-part segment cannot be used with linux
350 * -ENOMEM : out of memory
351 * 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h
354 segment_type (char* name)
357 struct dcss_segment seg;
362 dcss_mkname(name, seg.dcss_name);
363 rc = query_segment_type (&seg);
366 return seg.vm_segtype;
370 * check if segment collides with other segments that are currently loaded
371 * returns 1 if this is the case, 0 if no collision was found
374 segment_overlaps_others (struct dcss_segment *seg)
377 struct dcss_segment *tmp;
379 BUG_ON(!mutex_is_locked(&dcss_lock));
380 list_for_each(l, &dcss_list) {
381 tmp = list_entry(l, struct dcss_segment, list);
382 if ((tmp->start_addr >> 20) > (seg->end >> 20))
384 if ((tmp->end >> 20) < (seg->start_addr >> 20))
394 * real segment loading function, called from segment_load
397 __segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long *end)
399 unsigned long start_addr, end_addr, dummy;
400 struct dcss_segment *seg;
403 start_addr = end_addr = 0;
404 seg = kmalloc(sizeof(*seg), GFP_KERNEL | GFP_DMA);
409 dcss_mkname (name, seg->dcss_name);
410 rc = query_segment_type (seg);
414 if (loadshr_scode == DCSS_LOADSHRX) {
415 if (segment_overlaps_others(seg)) {
421 rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
426 seg->res = kzalloc(sizeof(struct resource), GFP_KERNEL);
427 if (seg->res == NULL) {
431 seg->res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
432 seg->res->start = seg->start_addr;
433 seg->res->end = seg->end;
434 memcpy(&seg->res_name, seg->dcss_name, 8);
435 EBCASC(seg->res_name, 8);
436 seg->res_name[8] = '\0';
437 strncat(seg->res_name, " (DCSS)", 7);
438 seg->res->name = seg->res_name;
439 rc = seg->vm_segtype;
440 if (rc == SEG_TYPE_SC ||
441 ((rc == SEG_TYPE_SR || rc == SEG_TYPE_ER) && !do_nonshared))
442 seg->res->flags |= IORESOURCE_READONLY;
443 if (request_resource(&iomem_resource, seg->res)) {
450 diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
451 &start_addr, &end_addr);
453 diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
454 &start_addr, &end_addr);
456 dcss_diag(&purgeseg_scode, seg->dcss_name,
462 pr_warning("Loading DCSS %s failed with rc=%ld\n", name,
464 rc = dcss_diag_translate_rc(end_addr);
465 dcss_diag(&purgeseg_scode, seg->dcss_name,
469 seg->start_addr = start_addr;
471 seg->do_nonshared = do_nonshared;
472 atomic_set(&seg->ref_count, 1);
473 list_add(&seg->list, &dcss_list);
474 *addr = seg->start_addr;
477 pr_info("DCSS %s of range %p to %p and type %s loaded as "
478 "exclusive-writable\n", name, (void*) seg->start_addr,
479 (void*) seg->end, segtype_string[seg->vm_segtype]);
481 pr_info("DCSS %s of range %p to %p and type %s loaded in "
482 "shared access mode\n", name, (void*) seg->start_addr,
483 (void*) seg->end, segtype_string[seg->vm_segtype]);
487 release_resource(seg->res);
490 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
498 * this function loads a DCSS segment
499 * name : name of the DCSS
500 * do_nonshared : 0 indicates that the dcss should be shared with other linux images
501 * 1 indicates that the dcss should be exclusive for this linux image
502 * addr : will be filled with start address of the segment
503 * end : will be filled with end address of the segment
505 * -ENOSYS : we are not running on VM
506 * -EIO : could not perform query or load diagnose
507 * -ENOENT : no such segment
508 * -EOPNOTSUPP: multi-part segment cannot be used with linux
509 * -ENOSPC : segment cannot be used (overlaps with storage)
510 * -EBUSY : segment can temporarily not be used (overlaps with dcss)
511 * -ERANGE : segment cannot be used (exceeds kernel mapping range)
512 * -EPERM : segment is currently loaded with incompatible permissions
513 * -ENOMEM : out of memory
514 * 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h
517 segment_load (char *name, int do_nonshared, unsigned long *addr,
520 struct dcss_segment *seg;
526 mutex_lock(&dcss_lock);
527 seg = segment_by_name (name);
529 rc = __segment_load (name, do_nonshared, addr, end);
531 if (do_nonshared == seg->do_nonshared) {
532 atomic_inc(&seg->ref_count);
533 *addr = seg->start_addr;
535 rc = seg->vm_segtype;
541 mutex_unlock(&dcss_lock);
546 * this function modifies the shared state of a DCSS segment. note that
547 * name : name of the DCSS
548 * do_nonshared : 0 indicates that the dcss should be shared with other linux images
549 * 1 indicates that the dcss should be exclusive for this linux image
551 * -EIO : could not perform load diagnose (segment gone!)
552 * -ENOENT : no such segment (segment gone!)
553 * -EAGAIN : segment is in use by other exploiters, try later
554 * -EINVAL : no segment with the given name is currently loaded - name invalid
555 * -EBUSY : segment can temporarily not be used (overlaps with dcss)
556 * 0 : operation succeeded
559 segment_modify_shared (char *name, int do_nonshared)
561 struct dcss_segment *seg;
562 unsigned long start_addr, end_addr, dummy;
565 start_addr = end_addr = 0;
566 mutex_lock(&dcss_lock);
567 seg = segment_by_name (name);
572 if (do_nonshared == seg->do_nonshared) {
573 pr_info("DCSS %s is already in the requested access "
578 if (atomic_read (&seg->ref_count) != 1) {
579 pr_warning("DCSS %s is in use and cannot be reloaded\n",
584 release_resource(seg->res);
586 seg->res->flags &= ~IORESOURCE_READONLY;
588 if (seg->vm_segtype == SEG_TYPE_SR ||
589 seg->vm_segtype == SEG_TYPE_ER)
590 seg->res->flags |= IORESOURCE_READONLY;
592 if (request_resource(&iomem_resource, seg->res)) {
593 pr_warning("DCSS %s overlaps with used memory resources "
594 "and cannot be reloaded\n", name);
600 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
602 diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
603 &start_addr, &end_addr);
605 diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
606 &start_addr, &end_addr);
612 pr_warning("Reloading DCSS %s failed with rc=%ld\n", name,
614 rc = dcss_diag_translate_rc(end_addr);
617 seg->start_addr = start_addr;
619 seg->do_nonshared = do_nonshared;
623 release_resource(seg->res);
626 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
627 list_del(&seg->list);
628 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
631 mutex_unlock(&dcss_lock);
636 * Decrease the use count of a DCSS segment and remove
637 * it from the address space if nobody is using it
641 segment_unload(char *name)
644 struct dcss_segment *seg;
649 mutex_lock(&dcss_lock);
650 seg = segment_by_name (name);
652 pr_err("Unloading unknown DCSS %s failed\n", name);
655 if (atomic_dec_return(&seg->ref_count) != 0)
657 release_resource(seg->res);
659 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
660 list_del(&seg->list);
661 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
664 mutex_unlock(&dcss_lock);
668 * save segment content permanently
671 segment_save(char *name)
673 struct dcss_segment *seg;
681 mutex_lock(&dcss_lock);
682 seg = segment_by_name (name);
685 pr_err("Saving unknown DCSS %s failed\n", name);
689 sprintf(cmd1, "DEFSEG %s", name);
690 for (i=0; i<seg->segcnt; i++) {
691 sprintf(cmd1+strlen(cmd1), " %lX-%lX %s",
692 seg->range[i].start >> PAGE_SHIFT,
693 seg->range[i].end >> PAGE_SHIFT,
694 segtype_string[seg->range[i].start & 0xff]);
696 sprintf(cmd2, "SAVESEG %s", name);
698 cpcmd(cmd1, NULL, 0, &response);
700 pr_err("Saving a DCSS failed with DEFSEG response code "
704 cpcmd(cmd2, NULL, 0, &response);
706 pr_err("Saving a DCSS failed with SAVESEG response code "
711 mutex_unlock(&dcss_lock);
715 * print appropriate error message for segment_load()/segment_type()
718 void segment_warning(int rc, char *seg_name)
722 pr_err("DCSS %s cannot be loaded or queried\n", seg_name);
725 pr_err("DCSS %s cannot be loaded or queried without "
729 pr_err("Loading or querying DCSS %s resulted in a "
730 "hardware error\n", seg_name);
733 pr_err("DCSS %s has multiple page ranges and cannot be "
734 "loaded or queried\n", seg_name);
737 pr_err("DCSS %s overlaps with used storage and cannot "
738 "be loaded\n", seg_name);
741 pr_err("%s needs used memory resources and cannot be "
742 "loaded or queried\n", seg_name);
745 pr_err("DCSS %s is already loaded in a different access "
749 pr_err("There is not enough memory to load or query "
750 "DCSS %s\n", seg_name);
753 pr_err("DCSS %s exceeds the kernel mapping range (%lu) "
754 "and cannot be loaded\n", seg_name, VMEM_MAX_PHYS);
761 EXPORT_SYMBOL(segment_load);
762 EXPORT_SYMBOL(segment_unload);
763 EXPORT_SYMBOL(segment_save);
764 EXPORT_SYMBOL(segment_type);
765 EXPORT_SYMBOL(segment_modify_shared);
766 EXPORT_SYMBOL(segment_warning);