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>
22 #include <asm/pgtable.h>
23 #include <asm/ebcdic.h>
24 #include <asm/errno.h>
25 #include <asm/extmem.h>
26 #include <asm/cpcmd.h>
27 #include <asm/setup.h>
29 #define DCSS_LOADSHR 0x00
30 #define DCSS_LOADNSR 0x04
31 #define DCSS_PURGESEG 0x08
32 #define DCSS_FINDSEG 0x0c
33 #define DCSS_LOADNOLY 0x10
34 #define DCSS_SEGEXT 0x18
35 #define DCSS_LOADSHRX 0x20
36 #define DCSS_LOADNSRX 0x24
37 #define DCSS_FINDSEGX 0x2c
38 #define DCSS_SEGEXTX 0x38
39 #define DCSS_FINDSEGA 0x0c
42 unsigned long start; /* last byte type */
43 unsigned long end; /* last byte reserved */
47 unsigned long segstart;
51 struct qrange range[6];
55 unsigned int start; /* last byte type */
56 unsigned int end; /* last byte reserved */
59 /* output area format for the Diag x'64' old subcode x'18' */
65 struct qrange_old range[6];
79 struct list_head list;
82 unsigned long start_addr;
86 unsigned int vm_segtype;
87 struct qrange range[6];
92 static DEFINE_MUTEX(dcss_lock);
93 static LIST_HEAD(dcss_list);
94 static char *segtype_string[] = { "SW", "EW", "SR", "ER", "SN", "EN", "SC",
96 static int loadshr_scode, loadnsr_scode, findseg_scode;
97 static int segext_scode, purgeseg_scode;
100 /* set correct Diag x'64' subcodes. */
102 dcss_set_subcodes(void)
104 char *name = kmalloc(8 * sizeof(char), GFP_KERNEL | GFP_DMA);
105 unsigned long rx, ry;
111 rx = (unsigned long) name;
114 strcpy(name, "dummy");
123 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
126 /* Diag x'64' new subcodes are supported, set to new subcodes */
128 loadshr_scode = DCSS_LOADSHRX;
129 loadnsr_scode = DCSS_LOADNSRX;
130 purgeseg_scode = DCSS_PURGESEG;
131 findseg_scode = DCSS_FINDSEGX;
132 segext_scode = DCSS_SEGEXTX;
135 /* Diag x'64' new subcodes are not supported, set to old subcodes */
136 loadshr_scode = DCSS_LOADNOLY;
137 loadnsr_scode = DCSS_LOADNSR;
138 purgeseg_scode = DCSS_PURGESEG;
139 findseg_scode = DCSS_FINDSEG;
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 if (*func > DCSS_SEGEXT)
213 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
214 /* 31-bit Diag x'64' old subcode, switch to 31-bit addressing mode */
222 : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
229 dcss_diag_translate_rc (int vm_rc) {
236 /* do a diag to get info about a segment.
237 * fills start_address, end and vm_segtype fields
240 query_segment_type (struct dcss_segment *seg)
242 unsigned long dummy, vmrc;
247 qin = kmalloc(sizeof(*qin), GFP_KERNEL | GFP_DMA);
248 qout = kmalloc(sizeof(*qout), GFP_KERNEL | GFP_DMA);
249 if ((qin == NULL) || (qout == NULL)) {
254 /* initialize diag input parameters */
255 qin->qopcode = DCSS_FINDSEGA;
256 qin->qoutptr = (unsigned long) qout;
257 qin->qoutlen = sizeof(struct qout64);
258 memcpy (qin->qname, seg->dcss_name, 8);
260 diag_cc = dcss_diag(&segext_scode, qin, &dummy, &vmrc);
267 pr_warning("Querying a DCSS type failed with rc=%ld\n", vmrc);
268 rc = dcss_diag_translate_rc (vmrc);
272 /* Only old format of output area of Diagnose x'64' is supported,
273 copy data for the new format. */
274 if (segext_scode == DCSS_SEGEXT) {
275 struct qout64_old *qout_old;
276 qout_old = kzalloc(sizeof(*qout_old), GFP_KERNEL | GFP_DMA);
277 if (qout_old == NULL) {
281 memcpy(qout_old, qout, sizeof(struct qout64_old));
282 qout->segstart = (unsigned long) qout_old->segstart;
283 qout->segend = (unsigned long) qout_old->segend;
284 qout->segcnt = qout_old->segcnt;
285 qout->segrcnt = qout_old->segrcnt;
287 if (qout->segcnt > 6)
289 for (i = 0; i < qout->segrcnt; i++) {
290 qout->range[i].start =
291 (unsigned long) qout_old->range[i].start;
293 (unsigned long) qout_old->range[i].end;
297 if (qout->segcnt > 6) {
302 if (qout->segcnt == 1) {
303 seg->vm_segtype = qout->range[0].start & 0xff;
305 /* multi-part segment. only one type supported here:
306 - all parts are contiguous
307 - all parts are either EW or EN type
308 - maximum 6 parts allowed */
309 unsigned long start = qout->segstart >> PAGE_SHIFT;
310 for (i=0; i<qout->segcnt; i++) {
311 if (((qout->range[i].start & 0xff) != SEG_TYPE_EW) &&
312 ((qout->range[i].start & 0xff) != SEG_TYPE_EN)) {
316 if (start != qout->range[i].start >> PAGE_SHIFT) {
320 start = (qout->range[i].end >> PAGE_SHIFT) + 1;
322 seg->vm_segtype = SEG_TYPE_EWEN;
325 /* analyze diag output and update seg */
326 seg->start_addr = qout->segstart;
327 seg->end = qout->segend;
329 memcpy (seg->range, qout->range, 6*sizeof(struct qrange));
330 seg->segcnt = qout->segcnt;
341 * get info about a segment
342 * possible return values:
343 * -ENOSYS : we are not running on VM
344 * -EIO : could not perform query diagnose
345 * -ENOENT : no such segment
346 * -EOPNOTSUPP: multi-part segment cannot be used with linux
347 * -ENOMEM : out of memory
348 * 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h
351 segment_type (char* name)
354 struct dcss_segment seg;
359 dcss_mkname(name, seg.dcss_name);
360 rc = query_segment_type (&seg);
363 return seg.vm_segtype;
367 * check if segment collides with other segments that are currently loaded
368 * returns 1 if this is the case, 0 if no collision was found
371 segment_overlaps_others (struct dcss_segment *seg)
374 struct dcss_segment *tmp;
376 BUG_ON(!mutex_is_locked(&dcss_lock));
377 list_for_each(l, &dcss_list) {
378 tmp = list_entry(l, struct dcss_segment, list);
379 if ((tmp->start_addr >> 20) > (seg->end >> 20))
381 if ((tmp->end >> 20) < (seg->start_addr >> 20))
391 * real segment loading function, called from segment_load
394 __segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long *end)
396 unsigned long start_addr, end_addr, dummy;
397 struct dcss_segment *seg;
400 start_addr = end_addr = 0;
401 seg = kmalloc(sizeof(*seg), GFP_KERNEL | GFP_DMA);
406 dcss_mkname (name, seg->dcss_name);
407 rc = query_segment_type (seg);
411 if (loadshr_scode == DCSS_LOADSHRX) {
412 if (segment_overlaps_others(seg)) {
418 rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
423 seg->res = kzalloc(sizeof(struct resource), GFP_KERNEL);
424 if (seg->res == NULL) {
428 seg->res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
429 seg->res->start = seg->start_addr;
430 seg->res->end = seg->end;
431 memcpy(&seg->res_name, seg->dcss_name, 8);
432 EBCASC(seg->res_name, 8);
433 seg->res_name[8] = '\0';
434 strncat(seg->res_name, " (DCSS)", 7);
435 seg->res->name = seg->res_name;
436 rc = seg->vm_segtype;
437 if (rc == SEG_TYPE_SC ||
438 ((rc == SEG_TYPE_SR || rc == SEG_TYPE_ER) && !do_nonshared))
439 seg->res->flags |= IORESOURCE_READONLY;
440 if (request_resource(&iomem_resource, seg->res)) {
447 diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
448 &start_addr, &end_addr);
450 diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
451 &start_addr, &end_addr);
453 dcss_diag(&purgeseg_scode, seg->dcss_name,
459 pr_warning("Loading DCSS %s failed with rc=%ld\n", name,
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_warning("DCSS %s is in use and cannot be reloaded\n",
581 release_resource(seg->res);
583 seg->res->flags &= ~IORESOURCE_READONLY;
585 if (seg->vm_segtype == SEG_TYPE_SR ||
586 seg->vm_segtype == SEG_TYPE_ER)
587 seg->res->flags |= IORESOURCE_READONLY;
589 if (request_resource(&iomem_resource, seg->res)) {
590 pr_warning("DCSS %s overlaps with used memory resources "
591 "and cannot be reloaded\n", name);
597 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
599 diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
600 &start_addr, &end_addr);
602 diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
603 &start_addr, &end_addr);
609 pr_warning("Reloading DCSS %s failed with rc=%ld\n", name,
611 rc = dcss_diag_translate_rc(end_addr);
614 seg->start_addr = start_addr;
616 seg->do_nonshared = do_nonshared;
620 release_resource(seg->res);
623 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
624 list_del(&seg->list);
625 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
628 mutex_unlock(&dcss_lock);
633 * Decrease the use count of a DCSS segment and remove
634 * it from the address space if nobody is using it
638 segment_unload(char *name)
641 struct dcss_segment *seg;
646 mutex_lock(&dcss_lock);
647 seg = segment_by_name (name);
649 pr_err("Unloading unknown DCSS %s failed\n", name);
652 if (atomic_dec_return(&seg->ref_count) != 0)
654 release_resource(seg->res);
656 vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
657 list_del(&seg->list);
658 dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
661 mutex_unlock(&dcss_lock);
665 * save segment content permanently
668 segment_save(char *name)
670 struct dcss_segment *seg;
678 mutex_lock(&dcss_lock);
679 seg = segment_by_name (name);
682 pr_err("Saving unknown DCSS %s failed\n", name);
686 sprintf(cmd1, "DEFSEG %s", name);
687 for (i=0; i<seg->segcnt; i++) {
688 sprintf(cmd1+strlen(cmd1), " %lX-%lX %s",
689 seg->range[i].start >> PAGE_SHIFT,
690 seg->range[i].end >> PAGE_SHIFT,
691 segtype_string[seg->range[i].start & 0xff]);
693 sprintf(cmd2, "SAVESEG %s", name);
695 cpcmd(cmd1, NULL, 0, &response);
697 pr_err("Saving a DCSS failed with DEFSEG response code "
701 cpcmd(cmd2, NULL, 0, &response);
703 pr_err("Saving a DCSS failed with SAVESEG response code "
708 mutex_unlock(&dcss_lock);
712 * print appropriate error message for segment_load()/segment_type()
715 void segment_warning(int rc, char *seg_name)
719 pr_err("DCSS %s cannot be loaded or queried\n", seg_name);
722 pr_err("DCSS %s cannot be loaded or queried without "
726 pr_err("Loading or querying DCSS %s resulted in a "
727 "hardware error\n", seg_name);
730 pr_err("DCSS %s has multiple page ranges and cannot be "
731 "loaded or queried\n", seg_name);
734 pr_err("DCSS %s overlaps with used storage and cannot "
735 "be loaded\n", seg_name);
738 pr_err("%s needs used memory resources and cannot be "
739 "loaded or queried\n", seg_name);
742 pr_err("DCSS %s is already loaded in a different access "
746 pr_err("There is not enough memory to load or query "
747 "DCSS %s\n", seg_name);
750 pr_err("DCSS %s exceeds the kernel mapping range (%lu) "
751 "and cannot be loaded\n", seg_name, VMEM_MAX_PHYS);
758 EXPORT_SYMBOL(segment_load);
759 EXPORT_SYMBOL(segment_unload);
760 EXPORT_SYMBOL(segment_save);
761 EXPORT_SYMBOL(segment_type);
762 EXPORT_SYMBOL(segment_modify_shared);
763 EXPORT_SYMBOL(segment_warning);