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[S390] dasd: add High Performance FICON support

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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>
This commit is contained in:
Stefan Weinhuber
2009-03-26 15:23:48 +01:00
committed by Martin Schwidefsky
parent b44b0ab3ba
commit f3eb5384cf
9 changed files with 1122 additions and 174 deletions
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7
drivers/s390/block/dasd_devmap.c
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@@ -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;