Release 4.14 arch/s390/mm/extmem.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Author(s)......: Carsten Otte <cotte@de.ibm.com>
 *                  Rob M van der Heij <rvdheij@nl.ibm.com>
 *                  Steven Shultz <shultzss@us.ibm.com>
 * Bugreports.to..: <Linux390@de.ibm.com>
 * Copyright IBM Corp. 2002, 2004
 */


#define KMSG_COMPONENT "extmem"

#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/bootmem.h>
#include <linux/ctype.h>
#include <linux/ioport.h>
#include <asm/diag.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/ebcdic.h>
#include <asm/errno.h>
#include <asm/extmem.h>
#include <asm/cpcmd.h>
#include <asm/setup.h>


#define DCSS_LOADSHR    0x00

#define DCSS_LOADNSR    0x04

#define DCSS_PURGESEG   0x08

#define DCSS_FINDSEG    0x0c

#define DCSS_LOADNOLY   0x10

#define DCSS_SEGEXT     0x18

#define DCSS_LOADSHRX	0x20

#define DCSS_LOADNSRX	0x24

#define DCSS_FINDSEGX	0x2c

#define DCSS_SEGEXTX	0x38

#define DCSS_FINDSEGA   0x0c


struct qrange {
	
unsigned long  start; /* last byte type */
	
unsigned long  end;   /* last byte reserved */
};


struct qout64 {
	
unsigned long segstart;
	
unsigned long segend;
	
int segcnt;
	
int segrcnt;
	
struct qrange range[6];
};


struct qrange_old {
	
unsigned int start; /* last byte type */
	
unsigned int end;   /* last byte reserved */
};

/* output area format for the Diag x'64' old subcode x'18' */

struct qout64_old {
	
int segstart;
	
int segend;
	
int segcnt;
	
int segrcnt;
	
struct qrange_old range[6];
};


struct qin64 {
	
char qopcode;
	
char rsrv1[3];
	
char qrcode;
	
char rsrv2[3];
	
char qname[8];
	
unsigned int qoutptr;
	
short int qoutlen;
};


struct dcss_segment {
	
struct list_head list;
	
char dcss_name[8];
	
char res_name[15];
	
unsigned long start_addr;
	
unsigned long end;
	
atomic_t ref_count;
	
int do_nonshared;
	
unsigned int vm_segtype;
	
struct qrange range[6];
	
int segcnt;
	
struct resource *res;
};

static DEFINE_MUTEX(dcss_lock);
static LIST_HEAD(dcss_list);

static char *segtype_string[] = { "SW", "EW", "SR", "ER", "SN", "EN", "SC",
					"EW/EN-MIXED" };


static int loadshr_scode, loadnsr_scode;


static int segext_scode, purgeseg_scode;

static int scode_set;

/* set correct Diag x'64' subcodes. */

static int

dcss_set_subcodes(void)
{
	char *name = kmalloc(8 * sizeof(char), GFP_KERNEL | GFP_DMA);
	unsigned long rx, ry;
	int rc;

	if (name == NULL)
		return -ENOMEM;

	rx = (unsigned long) name;
	ry = DCSS_FINDSEGX;

	strcpy(name, "dummy");
	diag_stat_inc(DIAG_STAT_X064);
	asm volatile(
                "       diag    %0,%1,0x64\n"
                "0:     ipm     %2\n"
                "       srl     %2,28\n"
                "       j       2f\n"
                "1:     la      %2,3\n"
                "2:\n"
                EX_TABLE(0b, 1b)
                : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc", "memory");

	kfree(name);
	/* Diag x'64' new subcodes are supported, set to new subcodes */
	if (rc != 3) {
		loadshr_scode = DCSS_LOADSHRX;
		loadnsr_scode = DCSS_LOADNSRX;
		purgeseg_scode = DCSS_PURGESEG;
		segext_scode = DCSS_SEGEXTX;
		return 0;
	}
	/* Diag x'64' new subcodes are not supported, set to old subcodes */
	loadshr_scode = DCSS_LOADNOLY;
	loadnsr_scode = DCSS_LOADNSR;
	purgeseg_scode = DCSS_PURGESEG;
	segext_scode = DCSS_SEGEXT;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hongjie Yang
117
93.60%
1
25.00%
Martin Schwidefsky
5
4.00%
1
25.00%
Heiko Carstens
3
2.40%
2
50.00%
Total
125
100.00%
4
100.00%

/*
 * Create the 8 bytes, ebcdic VM segment name from
 * an ascii name.
 */

static void

dcss_mkname(char *name, char *dcss_name)
{
	int i;

	for (i = 0; i < 8; i++) {
		if (name[i] == '\0')
			break;
		dcss_name[i] = toupper(name[i]);
	}
	for (; i < 8; i++)
		dcss_name[i] = ' ';
	ASCEBC(dcss_name, 8);
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
77
97.47%
1
50.00%
Martin Schwidefsky
2
2.53%
1
50.00%
Total
79
100.00%
2
100.00%

/*
 * search all segments in dcss_list, and return the one
 * namend *name. If not found, return NULL.
 */

static struct dcss_segment *

segment_by_name (char *name)
{
	char dcss_name[9];
	struct list_head *l;
	struct dcss_segment *tmp, *retval = NULL;

	BUG_ON(!mutex_is_locked(&dcss_lock));
	dcss_mkname (name, dcss_name);
	list_for_each (l, &dcss_list) {
		tmp = list_entry (l, struct dcss_segment, list);
		if (memcmp(tmp->dcss_name, dcss_name, 8) == 0) {
			retval = tmp;
			break;
		}
	}
	return retval;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Martin Schwidefsky
90
94.74%
1
50.00%
Heiko Carstens
5
5.26%
1
50.00%
Total
95
100.00%
2
100.00%

/*
 * Perform a function on a dcss segment.
 */

static inline int

dcss_diag(int *func, void *parameter,
           unsigned long *ret1, unsigned long *ret2)
{
	unsigned long rx, ry;
	int rc;

	if (scode_set == 0) {
		rc = dcss_set_subcodes();
		if (rc < 0)
			return rc;
		scode_set = 1;
	}
	rx = (unsigned long) parameter;
	ry = (unsigned long) *func;

	/* 64-bit Diag x'64' new subcode, keep in 64-bit addressing mode */
	diag_stat_inc(DIAG_STAT_X064);
	if (*func > DCSS_SEGEXT)
		asm volatile(
                        "       diag    %0,%1,0x64\n"
                        "       ipm     %2\n"
                        "       srl     %2,28\n"
                        : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
	/* 31-bit Diag x'64' old subcode, switch to 31-bit addressing mode */
	else
		asm volatile(
                        "       sam31\n"
                        "       diag    %0,%1,0x64\n"
                        "       sam64\n"
                        "       ipm     %2\n"
                        "       srl     %2,28\n"
                        : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
	*ret1 = rx;
	*ret2 = ry;
	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
61
54.95%
1
33.33%
Hongjie Yang
45
40.54%
1
33.33%
Martin Schwidefsky
5
4.50%
1
33.33%
Total
111
100.00%
3
100.00%


static inline int

dcss_diag_translate_rc (int vm_rc) {
	if (vm_rc == 44)
		return -ENOENT;
	return -EIO;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Martin Schwidefsky
19
79.17%
1
50.00%
Andrew Morton
5
20.83%
1
50.00%
Total
24
100.00%
2
100.00%

/* do a diag to get info about a segment.
 * fills start_address, end and vm_segtype fields
 */

static int

query_segment_type (struct dcss_segment *seg)
{
	unsigned long dummy, vmrc;
	int diag_cc, rc, i;
	struct qout64 *qout;
	struct qin64 *qin;

	qin = kmalloc(sizeof(*qin), GFP_KERNEL | GFP_DMA);
	qout = kmalloc(sizeof(*qout), GFP_KERNEL | GFP_DMA);
	if ((qin == NULL) || (qout == NULL)) {
		rc = -ENOMEM;
		goto out_free;
	}

	/* initialize diag input parameters */
	qin->qopcode = DCSS_FINDSEGA;
	qin->qoutptr = (unsigned long) qout;
	qin->qoutlen = sizeof(struct qout64);
	memcpy (qin->qname, seg->dcss_name, 8);

	diag_cc = dcss_diag(&segext_scode, qin, &dummy, &vmrc);

	if (diag_cc < 0) {
		rc = diag_cc;
		goto out_free;
	}
	if (diag_cc > 1) {
		pr_warn("Querying a DCSS type failed with rc=%ld\n", vmrc);
		rc = dcss_diag_translate_rc (vmrc);
		goto out_free;
	}

	/* Only old format of output area of Diagnose x'64' is supported,
           copy data for the new format. */
	if (segext_scode == DCSS_SEGEXT) {
		struct qout64_old *qout_old;
		qout_old = kzalloc(sizeof(*qout_old), GFP_KERNEL | GFP_DMA);
		if (qout_old == NULL) {
			rc = -ENOMEM;
			goto out_free;
		}
		memcpy(qout_old, qout, sizeof(struct qout64_old));
		qout->segstart = (unsigned long) qout_old->segstart;
		qout->segend = (unsigned long) qout_old->segend;
		qout->segcnt = qout_old->segcnt;
		qout->segrcnt = qout_old->segrcnt;

		if (qout->segcnt > 6)
			qout->segrcnt = 6;
		for (i = 0; i < qout->segrcnt; i++) {
			qout->range[i].start =
				(unsigned long) qout_old->range[i].start;
			qout->range[i].end =
				(unsigned long) qout_old->range[i].end;
		}
		kfree(qout_old);
	}
	if (qout->segcnt > 6) {
		rc = -EOPNOTSUPP;
		goto out_free;
	}

	if (qout->segcnt == 1) {
		seg->vm_segtype = qout->range[0].start & 0xff;
	} else {
		/* multi-part segment. only one type supported here:
                    - all parts are contiguous
                    - all parts are either EW or EN type
                    - maximum 6 parts allowed */
		unsigned long start = qout->segstart >> PAGE_SHIFT;
		for (i=0; i<qout->segcnt; i++) {
			if (((qout->range[i].start & 0xff) != SEG_TYPE_EW) &&
			    ((qout->range[i].start & 0xff) != SEG_TYPE_EN)) {
				rc = -EOPNOTSUPP;
				goto out_free;
			}
			if (start != qout->range[i].start >> PAGE_SHIFT) {
				rc = -EOPNOTSUPP;
				goto out_free;
			}
			start = (qout->range[i].end >> PAGE_SHIFT) + 1;
		}
		seg->vm_segtype = SEG_TYPE_EWEN;
	}

	/* analyze diag output and update seg */
	seg->start_addr = qout->segstart;
	seg->end = qout->segend;

	memcpy (seg->range, qout->range, 6*sizeof(struct qrange));
	seg->segcnt = qout->segcnt;

	rc = 0;

 out_free:
	kfree(qin);
	kfree(qout);
	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Martin Schwidefsky
263
44.35%
2
22.22%
Hongjie Yang
192
32.38%
2
22.22%
Andrew Morton
93
15.68%
1
11.11%
Heiko Carstens
39
6.58%
2
22.22%
Gerald Schaefer
5
0.84%
1
11.11%
Joe Perches
1
0.17%
1
11.11%
Total
593
100.00%
9
100.00%

/*
 * get info about a segment
 * possible return values:
 * -ENOSYS  : we are not running on VM
 * -EIO     : could not perform query diagnose
 * -ENOENT  : no such segment
 * -EOPNOTSUPP: multi-part segment cannot be used with linux
 * -ENOMEM  : out of memory
 * 0 .. 6   : type of segment as defined in include/asm-s390/extmem.h
 */

int

segment_type (char* name)
{
	int rc;
	struct dcss_segment seg;

	if (!MACHINE_IS_VM)
		return -ENOSYS;

	dcss_mkname(name, seg.dcss_name);
	rc = query_segment_type (&seg);
	if (rc < 0)
		return rc;
	return seg.vm_segtype;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Martin Schwidefsky
27
48.21%
2
50.00%
Hongjie Yang
24
42.86%
1
25.00%
Andrew Morton
5
8.93%
1
25.00%
Total
56
100.00%
4
100.00%

/*
 * check if segment collides with other segments that are currently loaded
 * returns 1 if this is the case, 0 if no collision was found
 */

static int

segment_overlaps_others (struct dcss_segment *seg)
{
	struct list_head *l;
	struct dcss_segment *tmp;

	BUG_ON(!mutex_is_locked(&dcss_lock));
	list_for_each(l, &dcss_list) {
		tmp = list_entry(l, struct dcss_segment, list);
		if ((tmp->start_addr >> 20) > (seg->end >> 20))
			continue;
		if ((tmp->end >> 20) < (seg->start_addr >> 20))
			continue;
		if (seg == tmp)
			continue;
		return 1;
	}
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hongjie Yang
89
87.25%
1
33.33%
Andrew Morton
7
6.86%
1
33.33%
Martin Schwidefsky
6
5.88%
1
33.33%
Total
102
100.00%
3
100.00%

/*
 * real segment loading function, called from segment_load
 */

static int

__segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long *end)
{
	unsigned long start_addr, end_addr, dummy;
	struct dcss_segment *seg;
	int rc, diag_cc;

	start_addr = end_addr = 0;
	seg = kmalloc(sizeof(*seg), GFP_KERNEL | GFP_DMA);
	if (seg == NULL) {
		rc = -ENOMEM;
		goto out;
	}
	dcss_mkname (name, seg->dcss_name);
	rc = query_segment_type (seg);
	if (rc < 0)
		goto out_free;

	if (loadshr_scode == DCSS_LOADSHRX) {
		if (segment_overlaps_others(seg)) {
			rc = -EBUSY;
			goto out_free;
		}
	}

	rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1);

	if (rc)
		goto out_free;

	seg->res = kzalloc(sizeof(struct resource), GFP_KERNEL);
	if (seg->res == NULL) {
		rc = -ENOMEM;
		goto out_shared;
	}
	seg->res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
	seg->res->start = seg->start_addr;
	seg->res->end = seg->end;
	memcpy(&seg->res_name, seg->dcss_name, 8);
	EBCASC(seg->res_name, 8);
	seg->res_name[8] = '\0';
	strncat(seg->res_name, " (DCSS)", 7);
	seg->res->name = seg->res_name;
	rc = seg->vm_segtype;
	if (rc == SEG_TYPE_SC ||
	    ((rc == SEG_TYPE_SR || rc == SEG_TYPE_ER) && !do_nonshared))
		seg->res->flags |= IORESOURCE_READONLY;
	if (request_resource(&iomem_resource, seg->res)) {
		rc = -EBUSY;
		kfree(seg->res);
		goto out_shared;
	}

	if (do_nonshared)
		diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
				&start_addr, &end_addr);
	else
		diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
				&start_addr, &end_addr);
	if (diag_cc < 0) {
		dcss_diag(&purgeseg_scode, seg->dcss_name,
				&dummy, &dummy);
		rc = diag_cc;
		goto out_resource;
	}
	if (diag_cc > 1) {
		pr_warn("Loading DCSS %s failed with rc=%ld\n", name, end_addr);
		rc = dcss_diag_translate_rc(end_addr);
		dcss_diag(&purgeseg_scode, seg->dcss_name,
				&dummy, &dummy);
		goto out_resource;
	}
	seg->start_addr = start_addr;
	seg->end = end_addr;
	seg->do_nonshared = do_nonshared;
	atomic_set(&seg->ref_count, 1);
	list_add(&seg->list, &dcss_list);
	*addr = seg->start_addr;
	*end  = seg->end;
	if (do_nonshared)
		pr_info("DCSS %s of range %p to %p and type %s loaded as "
			"exclusive-writable\n", name, (void*) seg->start_addr,
			(void*) seg->end, segtype_string[seg->vm_segtype]);
	else {
		pr_info("DCSS %s of range %p to %p and type %s loaded in "
			"shared access mode\n", name, (void*) seg->start_addr,
			(void*) seg->end, segtype_string[seg->vm_segtype]);
	}
	goto out;
 out_resource:
	release_resource(seg->res);
	kfree(seg->res);
 out_shared:
	vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
 out_free:
	kfree(seg);
 out:
	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Gerald Schaefer
199
32.05%
1
8.33%
Martin Schwidefsky
135
21.74%
3
25.00%
Andrew Morton
124
19.97%
1
8.33%
Hongjie Yang
98
15.78%
2
16.67%
Heiko Carstens
64
10.31%
4
33.33%
Joe Perches
1
0.16%
1
8.33%
Total
621
100.00%
12
100.00%

/*
 * this function loads a DCSS segment
 * name         : name of the DCSS
 * do_nonshared : 0 indicates that the dcss should be shared with other linux images
 *                1 indicates that the dcss should be exclusive for this linux image
 * addr         : will be filled with start address of the segment
 * end          : will be filled with end address of the segment
 * return values:
 * -ENOSYS  : we are not running on VM
 * -EIO     : could not perform query or load diagnose
 * -ENOENT  : no such segment
 * -EOPNOTSUPP: multi-part segment cannot be used with linux
 * -ENOSPC  : segment cannot be used (overlaps with storage)
 * -EBUSY   : segment can temporarily not be used (overlaps with dcss)
 * -ERANGE  : segment cannot be used (exceeds kernel mapping range)
 * -EPERM   : segment is currently loaded with incompatible permissions
 * -ENOMEM  : out of memory
 * 0 .. 6   : type of segment as defined in include/asm-s390/extmem.h
 */

int

segment_load (char *name, int do_nonshared, unsigned long *addr,
		unsigned long *end)
{
	struct dcss_segment *seg;
	int rc;

	if (!MACHINE_IS_VM)
		return -ENOSYS;

	mutex_lock(&dcss_lock);
	seg = segment_by_name (name);
	if (seg == NULL)
		rc = __segment_load (name, do_nonshared, addr, end);
	else {
		if (do_nonshared == seg->do_nonshared) {
			atomic_inc(&seg->ref_count);
			*addr = seg->start_addr;
			*end  = seg->end;
			rc    = seg->vm_segtype;
		} else {
			*addr = *end = 0;
			rc    = -EPERM;
		}
	}
	mutex_unlock(&dcss_lock);
	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Martin Schwidefsky
78
56.93%
1
33.33%
Andrew Morton
57
41.61%
1
33.33%
Heiko Carstens
2
1.46%
1
33.33%
Total
137
100.00%
3
100.00%

/*
 * this function modifies the shared state of a DCSS segment. note that
 * name         : name of the DCSS
 * do_nonshared : 0 indicates that the dcss should be shared with other linux images
 *                1 indicates that the dcss should be exclusive for this linux image
 * return values:
 * -EIO     : could not perform load diagnose (segment gone!)
 * -ENOENT  : no such segment (segment gone!)
 * -EAGAIN  : segment is in use by other exploiters, try later
 * -EINVAL  : no segment with the given name is currently loaded - name invalid
 * -EBUSY   : segment can temporarily not be used (overlaps with dcss)
 * 0        : operation succeeded
 */

int

segment_modify_shared (char *name, int do_nonshared)
{
	struct dcss_segment *seg;
	unsigned long start_addr, end_addr, dummy;
	int rc, diag_cc;

	start_addr = end_addr = 0;
	mutex_lock(&dcss_lock);
	seg = segment_by_name (name);
	if (seg == NULL) {
		rc = -EINVAL;
		goto out_unlock;
	}
	if (do_nonshared == seg->do_nonshared) {
		pr_info("DCSS %s is already in the requested access "
			"mode\n", name);
		rc = 0;
		goto out_unlock;
	}
	if (atomic_read (&seg->ref_count) != 1) {
		pr_warn("DCSS %s is in use and cannot be reloaded\n", name);
		rc = -EAGAIN;
		goto out_unlock;
	}
	release_resource(seg->res);
	if (do_nonshared)
		seg->res->flags &= ~IORESOURCE_READONLY;
	else
		if (seg->vm_segtype == SEG_TYPE_SR ||
		    seg->vm_segtype == SEG_TYPE_ER)
			seg->res->flags |= IORESOURCE_READONLY;

	if (request_resource(&iomem_resource, seg->res)) {
		pr_warn("DCSS %s overlaps with used memory resources and cannot be reloaded\n",
			name);
		rc = -EBUSY;
		kfree(seg->res);
		goto out_del_mem;
	}

	dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
	if (do_nonshared)
		diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
				&start_addr, &end_addr);
	else
		diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
				&start_addr, &end_addr);
	if (diag_cc < 0) {
		rc = diag_cc;
		goto out_del_res;
	}
	if (diag_cc > 1) {
		pr_warn("Reloading DCSS %s failed with rc=%ld\n",
			name, end_addr);
		rc = dcss_diag_translate_rc(end_addr);
		goto out_del_res;
	}
	seg->start_addr = start_addr;
	seg->end = end_addr;
	seg->do_nonshared = do_nonshared;
	rc = 0;
	goto out_unlock;
 out_del_res:
	release_resource(seg->res);
	kfree(seg->res);
 out_del_mem:
	vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
	list_del(&seg->list);
	dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
	kfree(seg);
 out_unlock:
	mutex_unlock(&dcss_lock);
	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Martin Schwidefsky
196
49.37%
1
11.11%
Gerald Schaefer
96
24.18%
1
11.11%
Hongjie Yang
86
21.66%
2
22.22%
Heiko Carstens
9
2.27%
3
33.33%
Andrew Morton
6
1.51%
1
11.11%
Joe Perches
4
1.01%
1
11.11%
Total
397
100.00%
9
100.00%

/*
 * Decrease the use count of a DCSS segment and remove
 * it from the address space if nobody is using it
 * any longer.
 */

void

segment_unload(char *name)
{
	unsigned long dummy;
	struct dcss_segment *seg;

	if (!MACHINE_IS_VM)
		return;

	mutex_lock(&dcss_lock);
	seg = segment_by_name (name);
	if (seg == NULL) {
		pr_err("Unloading unknown DCSS %s failed\n", name);
		goto out_unlock;
	}
	if (atomic_dec_return(&seg->ref_count) != 0)
		goto out_unlock;
	release_resource(seg->res);
	kfree(seg->res);
	vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
	list_del(&seg->list);
	dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
	kfree(seg);
out_unlock:
	mutex_unlock(&dcss_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
72
52.17%
1
11.11%
Martin Schwidefsky
25
18.12%
2
22.22%
Heiko Carstens
23
16.67%
3
33.33%
Gerald Schaefer
14
10.14%
1
11.11%
Hongjie Yang
4
2.90%
2
22.22%
Total
138
100.00%
9
100.00%

/*
 * save segment content permanently
 */

void

segment_save(char *name)
{
	struct dcss_segment *seg;
	char cmd1[160];
	char cmd2[80];
	int i, response;

	if (!MACHINE_IS_VM)
		return;

	mutex_lock(&dcss_lock);
	seg = segment_by_name (name);

	if (seg == NULL) {
		pr_err("Saving unknown DCSS %s failed\n", name);
		goto out;
	}

	sprintf(cmd1, "DEFSEG %s", name);
	for (i=0; i<seg->segcnt; i++) {
		sprintf(cmd1+strlen(cmd1), " %lX-%lX %s",
			seg->range[i].start >> PAGE_SHIFT,
			seg->range[i].end >> PAGE_SHIFT,
			segtype_string[seg->range[i].start & 0xff]);
	}
	sprintf(cmd2, "SAVESEG %s", name);
	response = 0;
	cpcmd(cmd1, NULL, 0, &response);
	if (response) {
		pr_err("Saving a DCSS failed with DEFSEG response code "
		       "%i\n", response);
		goto out;
	}
	cpcmd(cmd2, NULL, 0, &response);
	if (response) {
		pr_err("Saving a DCSS failed with SAVESEG response code "
		       "%i\n", response);
		goto out;
	}
out:
	mutex_unlock(&dcss_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
83
37.56%
1
10.00%
Martin Schwidefsky
80
36.20%
2
20.00%
Gerald Schaefer
40
18.10%
1
10.00%
Hongjie Yang
9
4.07%
2
20.00%
Heiko Carstens
5
2.26%
2
20.00%
Christian Bornträger
4
1.81%
2
20.00%
Total
221
100.00%
10
100.00%

/*
 * print appropriate error message for segment_load()/segment_type()
 * return code
 */


void segment_warning(int rc, char *seg_name)
{
	switch (rc) {
	case -ENOENT:
		pr_err("DCSS %s cannot be loaded or queried\n", seg_name);
		break;
	case -ENOSYS:
		pr_err("DCSS %s cannot be loaded or queried without "
		       "z/VM\n", seg_name);
		break;
	case -EIO:
		pr_err("Loading or querying DCSS %s resulted in a "
		       "hardware error\n", seg_name);
		break;
	case -EOPNOTSUPP:
		pr_err("DCSS %s has multiple page ranges and cannot be "
		       "loaded or queried\n", seg_name);
		break;
	case -ENOSPC:
		pr_err("DCSS %s overlaps with used storage and cannot "
		       "be loaded\n", seg_name);
		break;
	case -EBUSY:
		pr_err("%s needs used memory resources and cannot be "
		       "loaded or queried\n", seg_name);
		break;
	case -EPERM:
		pr_err("DCSS %s is already loaded in a different access "
		       "mode\n", seg_name);
		break;
	case -ENOMEM:
		pr_err("There is not enough memory to load or query "
		       "DCSS %s\n", seg_name);
		break;
	case -ERANGE:
		pr_err("DCSS %s exceeds the kernel mapping range (%lu) "
		       "and cannot be loaded\n", seg_name, VMEM_MAX_PHYS);
		break;
	default:
		break;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Martin Schwidefsky
110
79.71%
1
33.33%
Hongjie Yang
27
19.57%
1
33.33%
Heiko Carstens
1
0.72%
1
33.33%
Total
138
100.00%
3
100.00%


EXPORT_SYMBOL(segment_load);

EXPORT_SYMBOL(segment_unload);

EXPORT_SYMBOL(segment_save);

EXPORT_SYMBOL(segment_type);

EXPORT_SYMBOL(segment_modify_shared);

EXPORT_SYMBOL(segment_warning);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Martin Schwidefsky
1175
36.58%
4
15.38%
Hongjie Yang
783
24.38%
2
7.69%
Andrew Morton
706
21.98%
1
3.85%
Gerald Schaefer
369
11.49%
2
7.69%
Heiko Carstens
162
5.04%
10
38.46%
Joe Perches
6
0.19%
1
3.85%
Christian Bornträger
4
0.12%
2
7.69%
Thomas Gleixner
3
0.09%
1
3.85%
Cheng Renquan
2
0.06%
1
3.85%
Paul Gortmaker
1
0.03%
1
3.85%
Greg Kroah-Hartman
1
0.03%
1
3.85%
Total
3212
100.00%
26
100.00%
Directory: arch/s390/mm

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.