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authorStefan Weinhuber <wein@de.ibm.com>2009-03-26 15:23:48 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-03-26 15:24:05 +0100
commitf3eb5384cf0325c02e306b1d81e70f81a03d7432 (patch)
tree4d75517ad2c61ac2f8b6431eafd62b5d32c188ed /drivers/s390/block/dasd_devmap.c
parentb44b0ab3bac16356f03e94b1b49ba9305710c445 (diff)
downloadlinux-f3eb5384cf0325c02e306b1d81e70f81a03d7432.tar.bz2
[S390] dasd: add High Performance FICON support
To support High Performance FICON, the DASD device driver has to translate I/O requests into the new transport mode control words (TCW) instead of the traditional (command mode) CCW requests. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/block/dasd_devmap.c')
-rw-r--r--drivers/s390/block/dasd_devmap.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c
index 34339902efb9..da231a787cee 100644
--- a/drivers/s390/block/dasd_devmap.c
+++ b/drivers/s390/block/dasd_devmap.c
@@ -67,6 +67,8 @@ int dasd_probeonly = 0; /* is true, when probeonly mode is active */
int dasd_autodetect = 0; /* is true, when autodetection is active */
int dasd_nopav = 0; /* is true, when PAV is disabled */
EXPORT_SYMBOL_GPL(dasd_nopav);
+int dasd_nofcx; /* disable High Performance Ficon */
+EXPORT_SYMBOL_GPL(dasd_nofcx);
/*
* char *dasd[] is intended to hold the ranges supplied by the dasd= statement
@@ -272,6 +274,11 @@ dasd_parse_keyword( char *parsestring ) {
}
return residual_str;
}
+ if (strncmp("nofcx", parsestring, length) == 0) {
+ dasd_nofcx = 1;
+ MESSAGE(KERN_INFO, "%s", "disable High Performance Ficon");
+ return residual_str;
+ }
if (strncmp("fixedbuffers", parsestring, length) == 0) {
if (dasd_page_cache)
return residual_str;