[S390] dcssblk: add >2G DCSSs support and stacked contiguous DCSSs support.
The DCSS block device driver is modified to add >2G DCSSs support and
allow a DCSS block device to map to a set of contiguous DCSSs. The
extmem code is also modified to use new Diagnose x'64' subcodes for
>2G DCSSs.
Signed-off-by: Hongjie Yang <hongjie@us.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/mm/extmem.c b/arch/s390/mm/extmem.c
index f231f5e..580fc64 100644
--- a/arch/s390/mm/extmem.c
+++ b/arch/s390/mm/extmem.c
@@ -43,21 +43,41 @@
#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 int start; // 3byte start address, 1 byte type
- unsigned int end; // 3byte end address, 1 byte reserved
+ unsigned long start; /* last byte type */
+ unsigned long end; /* last byte reserved */
};
struct qout64 {
- int segstart;
- int segend;
+ unsigned long segstart;
+ unsigned long segend;
int segcnt;
int segrcnt;
struct qrange range[6];
};
+#ifdef CONFIG_64BIT
+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];
+};
+#endif
+
struct qin64 {
char qopcode;
char rsrv1[3];
@@ -86,6 +106,55 @@
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, findseg_scode;
+static int segext_scode, purgeseg_scode;
+static int scode_set;
+
+/* set correct Diag x'64' subcodes. */
+static int
+dcss_set_subcodes(void)
+{
+#ifdef CONFIG_64BIT
+ char *name = kmalloc(8 * sizeof(char), GFP_DMA);
+ unsigned long rx, ry;
+ int rc;
+
+ if (name == NULL)
+ return -ENOMEM;
+
+ rx = (unsigned long) name;
+ ry = DCSS_FINDSEGX;
+
+ strcpy(name, "dummy");
+ 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");
+
+ 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;
+ findseg_scode = DCSS_FINDSEGX;
+ segext_scode = DCSS_SEGEXTX;
+ return 0;
+ }
+#endif
+ /* Diag x'64' new subcodes are not supported, set to old subcodes */
+ loadshr_scode = DCSS_LOADNOLY;
+ loadnsr_scode = DCSS_LOADNSR;
+ purgeseg_scode = DCSS_PURGESEG;
+ findseg_scode = DCSS_FINDSEG;
+ segext_scode = DCSS_SEGEXT;
+ return 0;
+}
/*
* Create the 8 bytes, ebcdic VM segment name from
@@ -135,25 +204,45 @@
* Perform a function on a dcss segment.
*/
static inline int
-dcss_diag (__u8 func, void *parameter,
+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;
- asm volatile(
+ ry = (unsigned long) *func;
+
#ifdef CONFIG_64BIT
- " sam31\n"
- " diag %0,%1,0x64\n"
- " sam64\n"
+ /* 64-bit Diag x'64' new subcode, keep in 64-bit addressing mode */
+ 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");
#else
+ asm volatile(
" diag %0,%1,0x64\n"
-#endif
" ipm %2\n"
" srl %2,28\n"
: "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
+#endif
*ret1 = rx;
*ret2 = ry;
return rc;
@@ -190,14 +279,45 @@
qin->qoutlen = sizeof(struct qout64);
memcpy (qin->qname, seg->dcss_name, 8);
- diag_cc = dcss_diag (DCSS_SEGEXT, qin, &dummy, &vmrc);
+ diag_cc = dcss_diag(&segext_scode, qin, &dummy, &vmrc);
+ if (diag_cc < 0) {
+ rc = diag_cc;
+ goto out_free;
+ }
if (diag_cc > 1) {
PRINT_WARN ("segment_type: diag returned error %ld\n", vmrc);
rc = dcss_diag_translate_rc (vmrc);
goto out_free;
}
+#ifdef CONFIG_64BIT
+ /* 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(struct qout64_old), 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);
+ }
+#endif
if (qout->segcnt > 6) {
rc = -ENOTSUPP;
goto out_free;
@@ -269,6 +389,30 @@
}
/*
+ * 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;
+}
+
+/*
* real segment loading function, called from segment_load
*/
static int
@@ -276,7 +420,8 @@
{
struct dcss_segment *seg = kmalloc(sizeof(struct dcss_segment),
GFP_DMA);
- int dcss_command, rc, diag_cc;
+ int rc, diag_cc;
+ unsigned long start_addr, end_addr, dummy;
if (seg == NULL) {
rc = -ENOMEM;
@@ -287,6 +432,13 @@
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)
@@ -316,20 +468,28 @@
}
if (do_nonshared)
- dcss_command = DCSS_LOADNSR;
+ diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
+ &start_addr, &end_addr);
else
- dcss_command = DCSS_LOADNOLY;
-
- diag_cc = dcss_diag(dcss_command, seg->dcss_name,
- &seg->start_addr, &seg->end);
- if (diag_cc > 1) {
- PRINT_WARN ("segment_load: could not load segment %s - "
- "diag returned error (%ld)\n",name,seg->end);
- rc = dcss_diag_translate_rc (seg->end);
- dcss_diag(DCSS_PURGESEG, seg->dcss_name,
- &seg->start_addr, &seg->end);
+ 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) {
+ PRINT_WARN ("segment_load: could not load segment %s - "
+ "diag returned error (%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);
@@ -423,8 +583,8 @@
segment_modify_shared (char *name, int do_nonshared)
{
struct dcss_segment *seg;
- unsigned long dummy;
- int dcss_command, rc, diag_cc;
+ unsigned long start_addr, end_addr, dummy;
+ int rc, diag_cc;
mutex_lock(&dcss_lock);
seg = segment_by_name (name);
@@ -445,38 +605,51 @@
goto out_unlock;
}
release_resource(seg->res);
- if (do_nonshared) {
- dcss_command = DCSS_LOADNSR;
+ if (do_nonshared)
seg->res->flags &= ~IORESOURCE_READONLY;
- } else {
- dcss_command = DCSS_LOADNOLY;
+ 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)) {
PRINT_WARN("segment_modify_shared: could not reload segment %s"
" - overlapping resources\n", name);
rc = -EBUSY;
kfree(seg->res);
- goto out_del;
+ goto out_del_mem;
}
- dcss_diag(DCSS_PURGESEG, seg->dcss_name, &dummy, &dummy);
- diag_cc = dcss_diag(dcss_command, seg->dcss_name,
- &seg->start_addr, &seg->end);
+
+ 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) {
PRINT_WARN ("segment_modify_shared: could not reload segment %s"
- " - diag returned error (%ld)\n",name,seg->end);
- rc = dcss_diag_translate_rc (seg->end);
- goto out_del;
+ " - diag returned error (%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:
+ 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(DCSS_PURGESEG, seg->dcss_name, &dummy, &dummy);
+ dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
kfree(seg);
out_unlock:
mutex_unlock(&dcss_lock);
@@ -510,7 +683,7 @@
kfree(seg->res);
vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
list_del(&seg->list);
- dcss_diag(DCSS_PURGESEG, seg->dcss_name, &dummy, &dummy);
+ dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
kfree(seg);
out_unlock:
mutex_unlock(&dcss_lock);
@@ -545,7 +718,7 @@
endpfn = (seg->end) >> PAGE_SHIFT;
sprintf(cmd1, "DEFSEG %s", name);
for (i=0; i<seg->segcnt; i++) {
- sprintf(cmd1+strlen(cmd1), " %X-%X %s",
+ 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]);