[S390] dasd: add High Performance FICON support

[deliverable/linux.git] / drivers / s390 / block / dasd_devmap.c

diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c
index 34339902efb9efd2ed64f9ca6515141b0b85c9cb..da231a787ceebda3ea129730e545d3ca95ddcdc1 100644 (file)
--- 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;