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authorCornelia Huck <cohuck@de.ibm.com>2006-01-06 00:19:25 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 08:33:52 -0800
commitfb6958a594da49ece869793e6ec163b89fc5f79f (patch)
tree0746cc23ab13a059f9a34d7fc134aaf6410d07b8 /drivers/s390/cio/chsc.c
parent678a395b356a98368a93c3640252502b70c3676f (diff)
[PATCH] s390: multiple subchannel sets support
Add support for multiple subchannel sets. Works with arbitrary devices in subchannel set 1 and is transparent to device drivers. Although currently only two subchannel sets are available, this will work with the architectured maximum number of subchannel sets as well. Signed-off-by: Cornelia Huck <cohuck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/s390/cio/chsc.c')
-rw-r--r--drivers/s390/cio/chsc.c68
1 files changed, 60 insertions, 8 deletions
diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c
index ebd924962df0..7270808c02d1 100644
--- a/drivers/s390/cio/chsc.c
+++ b/drivers/s390/cio/chsc.c
@@ -1,7 +1,7 @@
/*
* drivers/s390/cio/chsc.c
* S/390 common I/O routines -- channel subsystem call
- * $Revision: 1.120 $
+ * $Revision: 1.126 $
*
* Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
* IBM Corporation
@@ -75,7 +75,9 @@ chsc_get_sch_desc_irq(struct subchannel *sch, void *page)
struct {
struct chsc_header request;
- u16 reserved1;
+ u16 reserved1a:10;
+ u16 ssid:2;
+ u16 reserved1b:4;
u16 f_sch; /* first subchannel */
u16 reserved2;
u16 l_sch; /* last subchannel */
@@ -102,6 +104,7 @@ chsc_get_sch_desc_irq(struct subchannel *sch, void *page)
.code = 0x0004,
};
+ ssd_area->ssid = sch->schid.ssid;
ssd_area->f_sch = sch->schid.sch_no;
ssd_area->l_sch = sch->schid.sch_no;
@@ -145,8 +148,8 @@ chsc_get_sch_desc_irq(struct subchannel *sch, void *page)
*/
if (ssd_area->st > 3) { /* uhm, that looks strange... */
CIO_CRW_EVENT(0, "Strange subchannel type %d"
- " for sch %04x\n", ssd_area->st,
- sch->schid.sch_no);
+ " for sch 0.%x.%04x\n", ssd_area->st,
+ sch->schid.ssid, sch->schid.sch_no);
/*
* There may have been a new subchannel type defined in the
* time since this code was written; since we don't know which
@@ -155,8 +158,9 @@ chsc_get_sch_desc_irq(struct subchannel *sch, void *page)
return 0;
} else {
const char *type[4] = {"I/O", "chsc", "message", "ADM"};
- CIO_CRW_EVENT(6, "ssd: sch %04x is %s subchannel\n",
- sch->schid.sch_no, type[ssd_area->st]);
+ CIO_CRW_EVENT(6, "ssd: sch 0.%x.%04x is %s subchannel\n",
+ sch->schid.ssid, sch->schid.sch_no,
+ type[ssd_area->st]);
sch->ssd_info.valid = 1;
sch->ssd_info.type = ssd_area->st;
@@ -364,7 +368,7 @@ s390_process_res_acc_new_sch(struct subchannel_id schid)
* that beast may be on we'll have to do a stsch
* on all devices, grr...
*/
- if (stsch(schid, &schib))
+ if (stsch_err(schid, &schib))
/* We're through */
return need_rescan ? -EAGAIN : -ENXIO;
@@ -818,7 +822,7 @@ __s390_vary_chpid_on(struct subchannel_id schid, void *data)
put_device(&sch->dev);
return 0;
}
- if (stsch(schid, &schib))
+ if (stsch_err(schid, &schib))
/* We're through */
return -ENXIO;
/* Put it on the slow path. */
@@ -1078,6 +1082,54 @@ chsc_alloc_sei_area(void)
return (sei_page ? 0 : -ENOMEM);
}
+int __init
+chsc_enable_facility(int operation_code)
+{
+ int ret;
+ struct {
+ struct chsc_header request;
+ u8 reserved1:4;
+ u8 format:4;
+ u8 reserved2;
+ u16 operation_code;
+ u32 reserved3;
+ u32 reserved4;
+ u32 operation_data_area[252];
+ struct chsc_header response;
+ u32 reserved5:4;
+ u32 format2:4;
+ u32 reserved6:24;
+ } *sda_area;
+
+ sda_area = (void *)get_zeroed_page(GFP_KERNEL|GFP_DMA);
+ if (!sda_area)
+ return -ENOMEM;
+ sda_area->request = (struct chsc_header) {
+ .length = 0x0400,
+ .code = 0x0031,
+ };
+ sda_area->operation_code = operation_code;
+
+ ret = chsc(sda_area);
+ if (ret > 0) {
+ ret = (ret == 3) ? -ENODEV : -EBUSY;
+ goto out;
+ }
+ switch (sda_area->response.code) {
+ case 0x0003: /* invalid request block */
+ case 0x0007:
+ ret = -EINVAL;
+ break;
+ case 0x0004: /* command not provided */
+ case 0x0101: /* facility not provided */
+ ret = -EOPNOTSUPP;
+ break;
+ }
+ out:
+ free_page((unsigned long)sda_area);
+ return ret;
+}
+
subsys_initcall(chsc_alloc_sei_area);
struct css_general_char css_general_characteristics;