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authorCornelia Huck <cornelia.huck@de.ibm.com>2008-07-14 09:58:46 +0200
committerHeiko Carstens <heiko.carstens@de.ibm.com>2008-07-14 10:02:06 +0200
commitc11561897ab57a3c11e0a284ba17795d580589ab (patch)
tree53224c4e8062a85b1794a3cabe81a86317538dfa /drivers/s390/cio/chsc.c
parentc820de39bd083222f5be2563181c87493e436f7c (diff)
[S390] cio: Cleanup crw interface.
Eliminate the need for the machine check handler to call into the common I/O layer directly by introducing an interface to register handlers for crws per rsc. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio/chsc.c')
-rw-r--r--drivers/s390/cio/chsc.c25
1 files changed, 21 insertions, 4 deletions
diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c
index 1c0f5db94c7..cb36f792978 100644
--- a/drivers/s390/cio/chsc.c
+++ b/drivers/s390/cio/chsc.c
@@ -16,6 +16,7 @@
#include <asm/cio.h>
#include <asm/chpid.h>
+#include "../s390mach.h"
#include "css.h"
#include "cio.h"
#include "cio_debug.h"
@@ -372,17 +373,25 @@ static void chsc_process_sei(struct chsc_sei_area *sei_area)
}
}
-void chsc_process_crw(void)
+static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
{
struct chsc_sei_area *sei_area;
+ if (overflow) {
+ css_schedule_eval_all();
+ return;
+ }
+ CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
+ "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
+ crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
+ crw0->erc, crw0->rsid);
if (!sei_page)
return;
/* Access to sei_page is serialized through machine check handler
* thread, so no need for locking. */
sei_area = sei_page;
- CIO_TRACE_EVENT( 2, "prcss");
+ CIO_TRACE_EVENT(2, "prcss");
do {
memset(sei_area, 0, sizeof(*sei_area));
sei_area->request.length = 0x0010;
@@ -751,15 +760,23 @@ out:
int __init chsc_alloc_sei_area(void)
{
+ int ret;
+
sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
- if (!sei_page)
+ if (!sei_page) {
CIO_MSG_EVENT(0, "Can't allocate page for processing of "
"chsc machine checks!\n");
- return (sei_page ? 0 : -ENOMEM);
+ return -ENOMEM;
+ }
+ ret = s390_register_crw_handler(CRW_RSC_CSS, chsc_process_crw);
+ if (ret)
+ kfree(sei_page);
+ return ret;
}
void __init chsc_free_sei_area(void)
{
+ s390_unregister_crw_handler(CRW_RSC_CSS);
kfree(sei_page);
}