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authorStefan Haberland <stefan.haberland@de.ibm.com>2009-10-14 12:43:48 +0200
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2009-10-14 12:43:53 +0200
commitd9fa9441ed6e0467d7d41de730581874c997e658 (patch)
tree4f6b0ec9058c616aa8d8265d59dd310d0a0f56a2 /drivers/s390/block
parentbe6e3f9cd639fec5882fca16e058843c3064c6c9 (diff)
[S390] dasd: use idal for device characteristics
If the rdc_buffer is above 2G we need indirect addresssing so we have to use an idaw to give the rdc_buffer to the ccw. If the rdc_buffer is under 2G nothing changes. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/block')
-rw-r--r--drivers/s390/block/dasd.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 53b8c255360..aaccc8ecfa8 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -2533,6 +2533,7 @@ static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
{
struct dasd_ccw_req *cqr;
struct ccw1 *ccw;
+ unsigned long *idaw;
cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
@@ -2546,9 +2547,17 @@ static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
ccw = cqr->cpaddr;
ccw->cmd_code = CCW_CMD_RDC;
- ccw->cda = (__u32)(addr_t)rdc_buffer;
- ccw->count = rdc_buffer_size;
+ if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
+ idaw = (unsigned long *) (cqr->data);
+ ccw->cda = (__u32)(addr_t) idaw;
+ ccw->flags = CCW_FLAG_IDA;
+ idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
+ } else {
+ ccw->cda = (__u32)(addr_t) rdc_buffer;
+ ccw->flags = 0;
+ }
+ ccw->count = rdc_buffer_size;
cqr->startdev = device;
cqr->memdev = device;
cqr->expires = 10*HZ;