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authorSebastian Ott <sebott@linux.vnet.ibm.com>2008-12-25 13:39:13 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-12-25 13:39:10 +0100
commit13952ec12dfeea793ff83c2a96139ed57eb0b897 (patch)
tree3311df62a1794bf95f78b2c57f25f0a79dc84523 /drivers/s390/cio/cio.h
parentcdb912a40df8b8507ab60b3d52f9980c0ba1f44d (diff)
[S390] cio: introduce cio_commit_config
To change the configuration of a subchannel we alter the modifiable bits of the subchannel's schib field and issue a modify subchannel. There can be the case that not all changes were applied -or worse- quietly overwritten by the hardware. With the next store subchannel we obtain the current state of the hardware but lose our target configuration. With this patch we introduce a subchannel_config structure which contains the target subchannel configuration. Additionally the msch wrapper cio_modify is replaced with cio_commit_config which copies the desired changes to a temporary schib. msch is then called with the temporary schib. This schib is only written back to the subchannel if all changes were applied. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio/cio.h')
-rw-r--r--drivers/s390/cio/cio.h16
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/s390/cio/cio.h b/drivers/s390/cio/cio.h
index fb125efd689..5150fba742a 100644
--- a/drivers/s390/cio/cio.h
+++ b/drivers/s390/cio/cio.h
@@ -45,6 +45,19 @@ struct pmcw {
/* ... in an operand exception. */
} __attribute__ ((packed));
+/* Target SCHIB configuration. */
+struct schib_config {
+ u64 mba;
+ u32 intparm;
+ u16 mbi;
+ u32 isc:3;
+ u32 ena:1;
+ u32 mme:2;
+ u32 mp:1;
+ u32 csense:1;
+ u32 mbfc:1;
+} __attribute__ ((packed));
+
/*
* subchannel information block
*/
@@ -83,6 +96,7 @@ struct subchannel {
struct css_driver *driver;
void *private; /* private per subchannel type data */
struct work_struct work;
+ struct schib_config config;
} __attribute__ ((aligned(8)));
#define IO_INTERRUPT_TYPE 0 /* I/O interrupt type */
@@ -101,8 +115,8 @@ extern int cio_start_key (struct subchannel *, struct ccw1 *, __u8, __u8);
extern int cio_cancel (struct subchannel *);
extern int cio_set_options (struct subchannel *, int);
extern int cio_get_options (struct subchannel *);
-extern int cio_modify (struct subchannel *);
extern int cio_update_schib(struct subchannel *sch);
+extern int cio_commit_config(struct subchannel *sch);
int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key);
int cio_tm_intrg(struct subchannel *sch);