]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - arch/s390/mm/extmem.c
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];
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];
81 struct list_head list
;
84 unsigned long start_addr
;
88 unsigned int vm_segtype
;
89 struct qrange range
[6];
94 static DEFINE_MUTEX(dcss_lock
);
95 static LIST_HEAD(dcss_list
);
96 static char *segtype_string
[] = { "SW", "EW", "SR", "ER", "SN", "EN", "SC",
98 static int loadshr_scode
, loadnsr_scode
, findseg_scode
;
99 static int segext_scode
, purgeseg_scode
;
100 static int scode_set
;
102 /* set correct Diag x'64' subcodes. */
104 dcss_set_subcodes(void)
107 char *name
= kmalloc(8 * sizeof(char), GFP_KERNEL
| GFP_DMA
);
108 unsigned long rx
, ry
;
114 rx
= (unsigned long) name
;
117 strcpy(name
, "dummy");
126 : "+d" (rx
), "+d" (ry
), "=d" (rc
) : : "cc");
129 /* Diag x'64' new subcodes are supported, set to new subcodes */
131 loadshr_scode
= DCSS_LOADSHRX
;
132 loadnsr_scode
= DCSS_LOADNSRX
;
133 purgeseg_scode
= DCSS_PURGESEG
;
134 findseg_scode
= DCSS_FINDSEGX
;
135 segext_scode
= DCSS_SEGEXTX
;
139 /* Diag x'64' new subcodes are not supported, set to old subcodes */
140 loadshr_scode
= DCSS_LOADNOLY
;
141 loadnsr_scode
= DCSS_LOADNSR
;
142 purgeseg_scode
= DCSS_PURGESEG
;
143 findseg_scode
= DCSS_FINDSEG
;
144 segext_scode
= DCSS_SEGEXT
;
149 * Create the 8 bytes, ebcdic VM segment name from
153 dcss_mkname(char *name
, char *dcss_name
)
157 for (i
= 0; i
< 8; i
++) {
160 dcss_name
[i
] = toupper(name
[i
]);
164 ASCEBC(dcss_name
, 8);
169 * search all segments in dcss_list, and return the one
170 * namend *name. If not found, return NULL.
172 static struct dcss_segment
*
173 segment_by_name (char *name
)
177 struct dcss_segment
*tmp
, *retval
= NULL
;
179 BUG_ON(!mutex_is_locked(&dcss_lock
));
180 dcss_mkname (name
, dcss_name
);
181 list_for_each (l
, &dcss_list
) {
182 tmp
= list_entry (l
, struct dcss_segment
, list
);
183 if (memcmp(tmp
->dcss_name
, dcss_name
, 8) == 0) {
193 * Perform a function on a dcss segment.
196 dcss_diag(int *func
, void *parameter
,
197 unsigned long *ret1
, unsigned long *ret2
)
199 unsigned long rx
, ry
;
202 if (scode_set
== 0) {
203 rc
= dcss_set_subcodes();
208 rx
= (unsigned long) parameter
;
209 ry
= (unsigned long) *func
;
212 /* 64-bit Diag x'64' new subcode, keep in 64-bit addressing mode */
213 if (*func
> DCSS_SEGEXT
)
218 : "+d" (rx
), "+d" (ry
), "=d" (rc
) : : "cc");
219 /* 31-bit Diag x'64' old subcode, switch to 31-bit addressing mode */
227 : "+d" (rx
), "+d" (ry
), "=d" (rc
) : : "cc");
233 : "+d" (rx
), "+d" (ry
), "=d" (rc
) : : "cc");
241 dcss_diag_translate_rc (int vm_rc
) {
248 /* do a diag to get info about a segment.
249 * fills start_address, end and vm_segtype fields
252 query_segment_type (struct dcss_segment
*seg
)
254 unsigned long dummy
, vmrc
;
259 qin
= kmalloc(sizeof(*qin
), GFP_KERNEL
| GFP_DMA
);
260 qout
= kmalloc(sizeof(*qout
), GFP_KERNEL
| GFP_DMA
);
261 if ((qin
== NULL
) || (qout
== NULL
)) {
266 /* initialize diag input parameters */
267 qin
->qopcode
= DCSS_FINDSEGA
;
268 qin
->qoutptr
= (unsigned long) qout
;
269 qin
->qoutlen
= sizeof(struct qout64
);
270 memcpy (qin
->qname
, seg
->dcss_name
, 8);
272 diag_cc
= dcss_diag(&segext_scode
, qin
, &dummy
, &vmrc
);
279 pr_warning("Querying a DCSS type failed with rc=%ld\n", vmrc
);
280 rc
= dcss_diag_translate_rc (vmrc
);
285 /* Only old format of output area of Diagnose x'64' is supported,
286 copy data for the new format. */
287 if (segext_scode
== DCSS_SEGEXT
) {
288 struct qout64_old
*qout_old
;
289 qout_old
= kzalloc(sizeof(*qout_old
), GFP_KERNEL
| GFP_DMA
);
290 if (qout_old
== NULL
) {
294 memcpy(qout_old
, qout
, sizeof(struct qout64_old
));
295 qout
->segstart
= (unsigned long) qout_old
->segstart
;
296 qout
->segend
= (unsigned long) qout_old
->segend
;
297 qout
->segcnt
= qout_old
->segcnt
;
298 qout
->segrcnt
= qout_old
->segrcnt
;
300 if (qout
->segcnt
> 6)
302 for (i
= 0; i
< qout
->segrcnt
; i
++) {
303 qout
->range
[i
].start
=
304 (unsigned long) qout_old
->range
[i
].start
;
306 (unsigned long) qout_old
->range
[i
].end
;
311 if (qout
->segcnt
> 6) {
316 if (qout
->segcnt
== 1) {
317 seg
->vm_segtype
= qout
->range
[0].start
& 0xff;
319 /* multi-part segment. only one type supported here:
320 - all parts are contiguous
321 - all parts are either EW or EN type
322 - maximum 6 parts allowed */
323 unsigned long start
= qout
->segstart
>> PAGE_SHIFT
;
324 for (i
=0; i
<qout
->segcnt
; i
++) {
325 if (((qout
->range
[i
].start
& 0xff) != SEG_TYPE_EW
) &&
326 ((qout
->range
[i
].start
& 0xff) != SEG_TYPE_EN
)) {
330 if (start
!= qout
->range
[i
].start
>> PAGE_SHIFT
) {
334 start
= (qout
->range
[i
].end
>> PAGE_SHIFT
) + 1;
336 seg
->vm_segtype
= SEG_TYPE_EWEN
;
339 /* analyze diag output and update seg */
340 seg
->start_addr
= qout
->segstart
;
341 seg
->end
= qout
->segend
;
343 memcpy (seg
->range
, qout
->range
, 6*sizeof(struct qrange
));
344 seg
->segcnt
= qout
->segcnt
;
355 * get info about a segment
356 * possible return values:
357 * -ENOSYS : we are not running on VM
358 * -EIO : could not perform query diagnose
359 * -ENOENT : no such segment
360 * -EOPNOTSUPP: multi-part segment cannot be used with linux
361 * -ENOMEM : out of memory
362 * 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h
365 segment_type (char* name
)
368 struct dcss_segment seg
;
373 dcss_mkname(name
, seg
.dcss_name
);
374 rc
= query_segment_type (&seg
);
377 return seg
.vm_segtype
;
381 * check if segment collides with other segments that are currently loaded
382 * returns 1 if this is the case, 0 if no collision was found
385 segment_overlaps_others (struct dcss_segment
*seg
)
388 struct dcss_segment
*tmp
;
390 BUG_ON(!mutex_is_locked(&dcss_lock
));
391 list_for_each(l
, &dcss_list
) {
392 tmp
= list_entry(l
, struct dcss_segment
, list
);
393 if ((tmp
->start_addr
>> 20) > (seg
->end
>> 20))
395 if ((tmp
->end
>> 20) < (seg
->start_addr
>> 20))
405 * real segment loading function, called from segment_load
408 __segment_load (char *name
, int do_nonshared
, unsigned long *addr
, unsigned long *end
)
410 unsigned long start_addr
, end_addr
, dummy
;
411 struct dcss_segment
*seg
;
414 start_addr
= end_addr
= 0;
415 seg
= kmalloc(sizeof(*seg
), GFP_KERNEL
| GFP_DMA
);
420 dcss_mkname (name
, seg
->dcss_name
);
421 rc
= query_segment_type (seg
);
425 if (loadshr_scode
== DCSS_LOADSHRX
) {
426 if (segment_overlaps_others(seg
)) {
432 rc
= vmem_add_mapping(seg
->start_addr
, seg
->end
- seg
->start_addr
+ 1);
437 seg
->res
= kzalloc(sizeof(struct resource
), GFP_KERNEL
);
438 if (seg
->res
== NULL
) {
442 seg
->res
->flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
;
443 seg
->res
->start
= seg
->start_addr
;
444 seg
->res
->end
= seg
->end
;
445 memcpy(&seg
->res_name
, seg
->dcss_name
, 8);
446 EBCASC(seg
->res_name
, 8);
447 seg
->res_name
[8] = '\0';
448 strncat(seg
->res_name
, " (DCSS)", 7);
449 seg
->res
->name
= seg
->res_name
;
450 rc
= seg
->vm_segtype
;
451 if (rc
== SEG_TYPE_SC
||
452 ((rc
== SEG_TYPE_SR
|| rc
== SEG_TYPE_ER
) && !do_nonshared
))
453 seg
->res
->flags
|= IORESOURCE_READONLY
;
454 if (request_resource(&iomem_resource
, seg
->res
)) {
461 diag_cc
= dcss_diag(&loadnsr_scode
, seg
->dcss_name
,
462 &start_addr
, &end_addr
);
464 diag_cc
= dcss_diag(&loadshr_scode
, seg
->dcss_name
,
465 &start_addr
, &end_addr
);
467 dcss_diag(&purgeseg_scode
, seg
->dcss_name
,
473 pr_warning("Loading DCSS %s failed with rc=%ld\n", name
,
475 rc
= dcss_diag_translate_rc(end_addr
);
476 dcss_diag(&purgeseg_scode
, seg
->dcss_name
,
480 seg
->start_addr
= start_addr
;
482 seg
->do_nonshared
= do_nonshared
;
483 atomic_set(&seg
->ref_count
, 1);
484 list_add(&seg
->list
, &dcss_list
);
485 *addr
= seg
->start_addr
;
488 pr_info("DCSS %s of range %p to %p and type %s loaded as "
489 "exclusive-writable\n", name
, (void*) seg
->start_addr
,
490 (void*) seg
->end
, segtype_string
[seg
->vm_segtype
]);
492 pr_info("DCSS %s of range %p to %p and type %s loaded in "
493 "shared access mode\n", name
, (void*) seg
->start_addr
,
494 (void*) seg
->end
, segtype_string
[seg
->vm_segtype
]);
498 release_resource(seg
->res
);
501 vmem_remove_mapping(seg
->start_addr
, seg
->end
- seg
->start_addr
+ 1);
509 * this function loads a DCSS segment
510 * name : name of the DCSS
511 * do_nonshared : 0 indicates that the dcss should be shared with other linux images
512 * 1 indicates that the dcss should be exclusive for this linux image
513 * addr : will be filled with start address of the segment
514 * end : will be filled with end address of the segment
516 * -ENOSYS : we are not running on VM
517 * -EIO : could not perform query or load diagnose
518 * -ENOENT : no such segment
519 * -EOPNOTSUPP: multi-part segment cannot be used with linux
520 * -ENOSPC : segment cannot be used (overlaps with storage)
521 * -EBUSY : segment can temporarily not be used (overlaps with dcss)
522 * -ERANGE : segment cannot be used (exceeds kernel mapping range)
523 * -EPERM : segment is currently loaded with incompatible permissions
524 * -ENOMEM : out of memory
525 * 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h
528 segment_load (char *name
, int do_nonshared
, unsigned long *addr
,
531 struct dcss_segment
*seg
;
537 mutex_lock(&dcss_lock
);
538 seg
= segment_by_name (name
);
540 rc
= __segment_load (name
, do_nonshared
, addr
, end
);
542 if (do_nonshared
== seg
->do_nonshared
) {
543 atomic_inc(&seg
->ref_count
);
544 *addr
= seg
->start_addr
;
546 rc
= seg
->vm_segtype
;
552 mutex_unlock(&dcss_lock
);
557 * this function modifies the shared state of a DCSS segment. note that
558 * name : name of the DCSS
559 * do_nonshared : 0 indicates that the dcss should be shared with other linux images
560 * 1 indicates that the dcss should be exclusive for this linux image
562 * -EIO : could not perform load diagnose (segment gone!)
563 * -ENOENT : no such segment (segment gone!)
564 * -EAGAIN : segment is in use by other exploiters, try later
565 * -EINVAL : no segment with the given name is currently loaded - name invalid
566 * -EBUSY : segment can temporarily not be used (overlaps with dcss)
567 * 0 : operation succeeded
570 segment_modify_shared (char *name
, int do_nonshared
)
572 struct dcss_segment
*seg
;
573 unsigned long start_addr
, end_addr
, dummy
;
576 start_addr
= end_addr
= 0;
577 mutex_lock(&dcss_lock
);
578 seg
= segment_by_name (name
);
583 if (do_nonshared
== seg
->do_nonshared
) {
584 pr_info("DCSS %s is already in the requested access "
589 if (atomic_read (&seg
->ref_count
) != 1) {
590 pr_warning("DCSS %s is in use and cannot be reloaded\n",
595 release_resource(seg
->res
);
597 seg
->res
->flags
&= ~IORESOURCE_READONLY
;
599 if (seg
->vm_segtype
== SEG_TYPE_SR
||
600 seg
->vm_segtype
== SEG_TYPE_ER
)
601 seg
->res
->flags
|= IORESOURCE_READONLY
;
603 if (request_resource(&iomem_resource
, seg
->res
)) {
604 pr_warning("DCSS %s overlaps with used memory resources "
605 "and cannot be reloaded\n", name
);
611 dcss_diag(&purgeseg_scode
, seg
->dcss_name
, &dummy
, &dummy
);
613 diag_cc
= dcss_diag(&loadnsr_scode
, seg
->dcss_name
,
614 &start_addr
, &end_addr
);
616 diag_cc
= dcss_diag(&loadshr_scode
, seg
->dcss_name
,
617 &start_addr
, &end_addr
);
623 pr_warning("Reloading DCSS %s failed with rc=%ld\n", name
,
625 rc
= dcss_diag_translate_rc(end_addr
);
628 seg
->start_addr
= start_addr
;
630 seg
->do_nonshared
= do_nonshared
;
634 release_resource(seg
->res
);
637 vmem_remove_mapping(seg
->start_addr
, seg
->end
- seg
->start_addr
+ 1);
638 list_del(&seg
->list
);
639 dcss_diag(&purgeseg_scode
, seg
->dcss_name
, &dummy
, &dummy
);
642 mutex_unlock(&dcss_lock
);
647 * Decrease the use count of a DCSS segment and remove
648 * it from the address space if nobody is using it
652 segment_unload(char *name
)
655 struct dcss_segment
*seg
;
660 mutex_lock(&dcss_lock
);
661 seg
= segment_by_name (name
);
663 pr_err("Unloading unknown DCSS %s failed\n", name
);
666 if (atomic_dec_return(&seg
->ref_count
) != 0)
668 release_resource(seg
->res
);
670 vmem_remove_mapping(seg
->start_addr
, seg
->end
- seg
->start_addr
+ 1);
671 list_del(&seg
->list
);
672 dcss_diag(&purgeseg_scode
, seg
->dcss_name
, &dummy
, &dummy
);
675 mutex_unlock(&dcss_lock
);
679 * save segment content permanently
682 segment_save(char *name
)
684 struct dcss_segment
*seg
;
692 mutex_lock(&dcss_lock
);
693 seg
= segment_by_name (name
);
696 pr_err("Saving unknown DCSS %s failed\n", name
);
700 sprintf(cmd1
, "DEFSEG %s", name
);
701 for (i
=0; i
<seg
->segcnt
; i
++) {
702 sprintf(cmd1
+strlen(cmd1
), " %lX-%lX %s",
703 seg
->range
[i
].start
>> PAGE_SHIFT
,
704 seg
->range
[i
].end
>> PAGE_SHIFT
,
705 segtype_string
[seg
->range
[i
].start
& 0xff]);
707 sprintf(cmd2
, "SAVESEG %s", name
);
709 cpcmd(cmd1
, NULL
, 0, &response
);
711 pr_err("Saving a DCSS failed with DEFSEG response code "
715 cpcmd(cmd2
, NULL
, 0, &response
);
717 pr_err("Saving a DCSS failed with SAVESEG response code "
722 mutex_unlock(&dcss_lock
);
726 * print appropriate error message for segment_load()/segment_type()
729 void segment_warning(int rc
, char *seg_name
)
733 pr_err("DCSS %s cannot be loaded or queried\n", seg_name
);
736 pr_err("DCSS %s cannot be loaded or queried without "
740 pr_err("Loading or querying DCSS %s resulted in a "
741 "hardware error\n", seg_name
);
744 pr_err("DCSS %s has multiple page ranges and cannot be "
745 "loaded or queried\n", seg_name
);
748 pr_err("DCSS %s overlaps with used storage and cannot "
749 "be loaded\n", seg_name
);
752 pr_err("%s needs used memory resources and cannot be "
753 "loaded or queried\n", seg_name
);
756 pr_err("DCSS %s is already loaded in a different access "
760 pr_err("There is not enough memory to load or query "
761 "DCSS %s\n", seg_name
);
764 pr_err("DCSS %s exceeds the kernel mapping range (%lu) "
765 "and cannot be loaded\n", seg_name
, VMEM_MAX_PHYS
);
772 EXPORT_SYMBOL(segment_load
);
773 EXPORT_SYMBOL(segment_unload
);
774 EXPORT_SYMBOL(segment_save
);
775 EXPORT_SYMBOL(segment_type
);
776 EXPORT_SYMBOL(segment_modify_shared
);
777 EXPORT_SYMBOL(segment_warning
);