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;
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", "memory");
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 segext_scode = DCSS_SEGEXTX;
136 /* Diag x'64' new subcodes are not supported, set to old subcodes */
137 loadshr_scode = DCSS_LOADNOLY;
138 loadnsr_scode = DCSS_LOADNSR;
139 purgeseg_scode = DCSS_PURGESEG;
140 segext_scode = DCSS_SEGEXT;
145 * Create the 8 bytes, ebcdic VM segment name from
149 dcss_mkname(char *name, char *dcss_name)
153 for (i = 0; i < 8; i++) {
156 dcss_name[i] = toupper(name[i]);
160 ASCEBC(dcss_name, 8);
165 * search all segments in dcss_list, and return the one
166 * namend *name. If not found, return NULL.
168 static struct dcss_segment *
169 segment_by_name (char *name)
173 struct dcss_segment *tmp, *retval = NULL;
175 BUG_ON(!mutex_is_locked(&dcss_lock));
176 dcss_mkname (name, dcss_name);
177 list_for_each (l, &dcss_list) {
178 tmp = list_entry (l, struct dcss_segment, list);
179 if (memcmp(tmp->dcss_name, dcss_name, 8) == 0) {
189 * Perform a function on a dcss segment.
192 dcss_diag(int *func, void *parameter,
193 unsigned long *ret1, unsigned long *ret2)
195 unsigned long rx, ry;
198 if (scode_set == 0) {
199 rc = dcss_set_subcodes();
204 rx = (unsigned long) parameter;
205 ry = (unsigned long) *func;
207 /* 64-bit Diag x'64' new subcode, keep in 64-bit addressing mode */
208 diag_stat_inc(DIAG_STAT_X064);
209 if (*func > DCSS_SEGEXT)
214 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
215 /* 31-bit Diag x'64' old subcode, switch to 31-bit addressing mode */
223 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
230 dcss_diag_translate_rc (int vm_rc) {
237 /* do a diag to get info about a segment.
238 * fills start_address, end and vm_segtype fields
241 query_segment_type (struct dcss_segment *seg)
243 unsigned long dummy, vmrc;
248 qin = kmalloc(sizeof(*qin), GFP_KERNEL | GFP_DMA);
249 qout = kmalloc(sizeof(*qout), GFP_KERNEL | GFP_DMA);
250 if ((qin == NULL) || (qout == NULL)) {
255 /* initialize diag input parameters */
256 qin->qopcode = DCSS_FINDSEGA;
257 qin->qoutptr = (unsigned long) qout;
258 qin->qoutlen = sizeof(struct qout64);
259 memcpy (qin->qname, seg->dcss_name, 8);
261 diag_cc = dcss_diag(&segext_scode, qin, &dummy, &vmrc);
268 pr_warn("Querying a DCSS type failed with rc=%ld\n", vmrc);
269 rc = dcss_diag_translate_rc (vmrc);
273 /* Only old format of output area of Diagnose x'64' is supported,
274 copy data for the new format. */
275 if (segext_scode == DCSS_SEGEXT) {
276 struct qout64_old *qout_old;
277 qout_old = kzalloc(sizeof(*qout_old), GFP_KERNEL | GFP_DMA);
278 if (qout_old == NULL) {
282 memcpy(qout_old, qout, sizeof(struct qout64_old));
283 qout->segstart = (unsigned long) qout_old->segstart;
284 qout->segend = (unsigned long) qout_old->segend;
285 qout->segcnt = qout_old->segcnt;
286 qout->segrcnt = qout_old->segrcnt;
288 if (qout->segcnt > 6)
290 for (i = 0; i < qout->segrcnt; i++) {
291 qout->range[i].start =
292 (unsigned long) qout_old->range[i].start;
294 (unsigned long) qout_old->range[i].end;
298 if (qout->segcnt > 6) {
303 if (qout->segcnt == 1) {
304 seg->vm_segtype = qout->range[0].start & 0xff;
306 /* multi-part segment. only one type supported here:
307 - all parts are contiguous
308 - all parts are either EW or EN type
309 - maximum 6 parts allowed */
310 unsigned long start = qout->segstart >> PAGE_SHIFT;
311 for (i=0; i<qout->segcnt; i++) {
312 if (((qout->range[i].start & 0xff) != SEG_TYPE_EW) &&
313 ((qout->range[i].start & 0xff) != SEG_TYPE_EN)) {
317 if (start != qout->range[i].start >> PAGE_SHIFT) {
321 start = (qout->range[i].end >> PAGE_SHIFT) + 1;
323 seg->vm_segtype = SEG_TYPE_EWEN;
326 /* analyze diag output and update seg */
327 seg->start_addr = qout->segstart;
328 seg->end = qout->segend;
330 memcpy (seg->range, qout->range, 6*sizeof(struct qrange));
331 seg->segcnt = qout->segcnt;
342 * get info about a segment
343 * possible return values:
344 * -ENOSYS : we are not running on VM
345 * -EIO : could not perform query diagnose
346 * -ENOENT : no such segment
347 * -EOPNOTSUPP: multi-part segment cannot be used with linux
348 * -ENOMEM : out of memory
349 * 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h
352 segment_type (char* name)
355 struct dcss_segment seg;
360 dcss_mkname(name, seg.dcss_name);
361 rc = query_segment_type (&seg);
364 return seg.vm_segtype;
368 * check if segment collides with other segments that are currently loaded
369 * returns 1 if this is the case, 0 if no collision was found
372 segment_overlaps_others (struct dcss_segment *seg)
375 struct dcss_segment *tmp;
377 BUG_ON(!mutex_is_locked(&dcss_lock));
378 list_for_each(l, &dcss_list) {
379 tmp = list_entry(l, struct dcss_segment, list);
380 if ((tmp->start_addr >> 20) > (seg->end >> 20))
382 if ((tmp->end >> 20) < (seg->start_addr >> 20))
392 * real segment loading function, called from segment_load
395 __segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long *end)
397 unsigned long start_addr, end_addr, dummy;
398 struct dcss_segment *seg;
401 start_addr = end_addr = 0;
402 seg = kmalloc(sizeof(*seg), GFP_KERNEL | GFP_DMA);
407 dcss_mkname (name, seg->dcss_name);
408 rc = query_segment_type (seg);
412 if (loadshr_scode == DCSS_LOADSHRX) {
413 if (segment_overlaps_others(seg)) {
419 rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
424 seg->res = kzalloc(sizeof(struct resource), GFP_KERNEL);
425 if (seg->res == NULL) {
429 seg->res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
430 seg->res->start = seg->start_addr;
431 seg->res->end = seg->end;
432 memcpy(&seg->res_name, seg->dcss_name, 8);
433 EBCASC(seg->res_name, 8);
434 seg->res_name[8] = '\0';
435 strncat(seg->res_name, " (DCSS)", 7);
436 seg->res->name = seg->res_name;
437 rc = seg->vm_segtype;
438 if (rc == SEG_TYPE_SC ||
439 ((rc == SEG_TYPE_SR || rc == SEG_TYPE_ER) && !do_nonshared))
440 seg->res->flags |= IORESOURCE_READONLY;
441 if (request_resource(&iomem_resource, seg->res)) {
448 diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
449 &start_addr, &end_addr);
451 diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
452 &start_addr, &end_addr);
454 dcss_diag(&purgeseg_scode, seg->dcss_name,
460 pr_warn("Loading DCSS %s failed with rc=%ld\n", name, end_addr);
461 rc = dcss_diag_translate_rc(end_addr);
462 dcss_diag(&purgeseg_scode, seg->dcss_name,
466 seg->start_addr = start_addr;
468 seg->do_nonshared = do_nonshared;
469 atomic_set(&seg->ref_count, 1);
470 list_add(&seg->list, &dcss_list);
471 *addr = seg->start_addr;
474 pr_info("DCSS %s of range %p to %p and type %s loaded as "
475 "exclusive-writable\n", name, (void*) seg->start_addr,
476 (void*) seg->end, segtype_string[seg->vm_segtype]);
478 pr_info("DCSS %s of range %p to %p and type %s loaded in "
479 "shared access mode\n", name, (void*) seg->start_addr,
480 (void*) seg->end, segtype_string[seg->vm_segtype]);
484 release_resource(seg->res);
487 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
495 * this function loads a DCSS segment
496 * name : name of the DCSS
497 * do_nonshared : 0 indicates that the dcss should be shared with other linux images
498 * 1 indicates that the dcss should be exclusive for this linux image
499 * addr : will be filled with start address of the segment
500 * end : will be filled with end address of the segment
502 * -ENOSYS : we are not running on VM
503 * -EIO : could not perform query or load diagnose
504 * -ENOENT : no such segment
505 * -EOPNOTSUPP: multi-part segment cannot be used with linux
506 * -ENOSPC : segment cannot be used (overlaps with storage)
507 * -EBUSY : segment can temporarily not be used (overlaps with dcss)
508 * -ERANGE : segment cannot be used (exceeds kernel mapping range)
509 * -EPERM : segment is currently loaded with incompatible permissions
510 * -ENOMEM : out of memory
511 * 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h
514 segment_load (char *name, int do_nonshared, unsigned long *addr,
517 struct dcss_segment *seg;
523 mutex_lock(&dcss_lock);
524 seg = segment_by_name (name);
526 rc = __segment_load (name, do_nonshared, addr, end);
528 if (do_nonshared == seg->do_nonshared) {
529 atomic_inc(&seg->ref_count);
530 *addr = seg->start_addr;
532 rc = seg->vm_segtype;
538 mutex_unlock(&dcss_lock);
543 * this function modifies the shared state of a DCSS segment. note that
544 * name : name of the DCSS
545 * do_nonshared : 0 indicates that the dcss should be shared with other linux images
546 * 1 indicates that the dcss should be exclusive for this linux image
548 * -EIO : could not perform load diagnose (segment gone!)
549 * -ENOENT : no such segment (segment gone!)
550 * -EAGAIN : segment is in use by other exploiters, try later
551 * -EINVAL : no segment with the given name is currently loaded - name invalid
552 * -EBUSY : segment can temporarily not be used (overlaps with dcss)
553 * 0 : operation succeeded
556 segment_modify_shared (char *name, int do_nonshared)
558 struct dcss_segment *seg;
559 unsigned long start_addr, end_addr, dummy;
562 start_addr = end_addr = 0;
563 mutex_lock(&dcss_lock);
564 seg = segment_by_name (name);
569 if (do_nonshared == seg->do_nonshared) {
570 pr_info("DCSS %s is already in the requested access "
575 if (atomic_read (&seg->ref_count) != 1) {
576 pr_warn("DCSS %s is in use and cannot be reloaded\n", name);
580 release_resource(seg->res);
582 seg->res->flags &= ~IORESOURCE_READONLY;
584 if (seg->vm_segtype == SEG_TYPE_SR ||
585 seg->vm_segtype == SEG_TYPE_ER)
586 seg->res->flags |= IORESOURCE_READONLY;
588 if (request_resource(&iomem_resource, seg->res)) {
589 pr_warn("DCSS %s overlaps with used memory resources and cannot be reloaded\n",
596 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
598 diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
599 &start_addr, &end_addr);
601 diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
602 &start_addr, &end_addr);
608 pr_warn("Reloading DCSS %s failed with rc=%ld\n",
610 rc = dcss_diag_translate_rc(end_addr);
613 seg->start_addr = start_addr;
615 seg->do_nonshared = do_nonshared;
619 release_resource(seg->res);
622 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
623 list_del(&seg->list);
624 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
627 mutex_unlock(&dcss_lock);
632 * Decrease the use count of a DCSS segment and remove
633 * it from the address space if nobody is using it
637 segment_unload(char *name)
640 struct dcss_segment *seg;
645 mutex_lock(&dcss_lock);
646 seg = segment_by_name (name);
648 pr_err("Unloading unknown DCSS %s failed\n", name);
651 if (atomic_dec_return(&seg->ref_count) != 0)
653 release_resource(seg->res);
655 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
656 list_del(&seg->list);
657 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
660 mutex_unlock(&dcss_lock);
664 * save segment content permanently
667 segment_save(char *name)
669 struct dcss_segment *seg;
677 mutex_lock(&dcss_lock);
678 seg = segment_by_name (name);
681 pr_err("Saving unknown DCSS %s failed\n", name);
685 sprintf(cmd1, "DEFSEG %s", name);
686 for (i=0; i<seg->segcnt; i++) {
687 sprintf(cmd1+strlen(cmd1), " %lX-%lX %s",
688 seg->range[i].start >> PAGE_SHIFT,
689 seg->range[i].end >> PAGE_SHIFT,
690 segtype_string[seg->range[i].start & 0xff]);
692 sprintf(cmd2, "SAVESEG %s", name);
694 cpcmd(cmd1, NULL, 0, &response);
696 pr_err("Saving a DCSS failed with DEFSEG response code "
700 cpcmd(cmd2, NULL, 0, &response);
702 pr_err("Saving a DCSS failed with SAVESEG response code "
707 mutex_unlock(&dcss_lock);
711 * print appropriate error message for segment_load()/segment_type()
714 void segment_warning(int rc, char *seg_name)
718 pr_err("DCSS %s cannot be loaded or queried\n", seg_name);
721 pr_err("DCSS %s cannot be loaded or queried without "
725 pr_err("Loading or querying DCSS %s resulted in a "
726 "hardware error\n", seg_name);
729 pr_err("DCSS %s has multiple page ranges and cannot be "
730 "loaded or queried\n", seg_name);
733 pr_err("DCSS %s overlaps with used storage and cannot "
734 "be loaded\n", seg_name);
737 pr_err("%s needs used memory resources and cannot be "
738 "loaded or queried\n", seg_name);
741 pr_err("DCSS %s is already loaded in a different access "
745 pr_err("There is not enough memory to load or query "
746 "DCSS %s\n", seg_name);
749 pr_err("DCSS %s exceeds the kernel mapping range (%lu) "
750 "and cannot be loaded\n", seg_name, VMEM_MAX_PHYS);
757 EXPORT_SYMBOL(segment_load);
758 EXPORT_SYMBOL(segment_unload);
759 EXPORT_SYMBOL(segment_save);
760 EXPORT_SYMBOL(segment_type);
761 EXPORT_SYMBOL(segment_modify_shared);
762 EXPORT_SYMBOL(segment_warning);