patch-2.2.18 linux/drivers/s390/idals.c

• Lines: 80
• Date: Wed Nov 8 23:05:32 2000
• Orig file: v2.2.17/drivers/s390/idals.c
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/drivers/s390/idals.c linux/drivers/s390/idals.c
@@ -0,0 +1,79 @@
+/* 
+   * File...........: linux/drivers/s390x/idals.c
+   * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
+   * Bugreports.to..: <Linux390@de.ibm.com>
+   * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 2000a
+   
+   * History of changes
+   * 07/24/00 new file
+ */
+
+#include <linux/malloc.h>
+#include <asm/irq.h>
+#include <asm/idals.h>
+#include <asm/spinlock.h>
+
+#ifdef PRINTK_HEADER
+#undef PRINTK_HEADER
+#endif
+#define PRINTK_HEADER "idals:"
+
+/* a name template for the cache-names */
+static char idal_name_template[] = "idalcache-\0\0\0\0"; /* fill name with zeroes! */
+/* the cache's names */
+static char idal_cache_name[IDAL_NUMBER_CACHES][sizeof(idal_name_template)+1]; 
+/* the caches itself*/
+static kmem_cache_t *idal_cache[IDAL_NUMBER_CACHES]; 
+
+void
+free_idal ( ccw1_t *cp )
+{
+	idaw_t *idal;
+	unsigned long upper2k,lower2k;
+	int nridaws,cacheind;
+	if ( cp -> flags & CCW_FLAG_IDA ) {
+		idal = cp -> cda;
+		lower2k = *idal & 0xfffffffffffff800;
+		upper2k = (*idal  + cp -> count - 1) & 0xfffffffffffff800;
+		nridaws = ((upper2k - lower2k) >> 11) + 1;
+		for ( cacheind = 0; (1 << cacheind) < nridaws ; cacheind ++ );
+		kmem_cache_free ( idal_cache[cacheind], idal );
+	}
+}
+
+int 
+idal_support_init ( void ) 
+{
+	int rc=0;
+	int cachind;
+	
+	for ( cachind = 0; cachind < IDAL_NUMBER_CACHES; cachind ++ ) {
+		int slabsize = 8 << cachind;
+		sprintf ( idal_cache_name[cachind], 
+			  "%s%d%c", idal_name_template, slabsize, 0);
+		idal_cache[cachind] = kmem_cache_create( idal_cache_name[cachind], 
+							 slabsize, 0,
+							 SLAB_HWCACHE_ALIGN | SLAB_DMA, 
+							 NULL, NULL );
+		if ( ! idal_cache [cachind] ) {
+			printk (KERN_WARNING PRINTK_HEADER "Allocation of IDAL cache failed\n");
+		}
+	}
+	
+	return rc;
+}
+
+void idal_support_cleanup ( void )
+{
+	int cachind;
+
+	/* Shrink the caches, if available */
+	for ( cachind = 0; cachind < IDAL_NUMBER_CACHES; cachind ++ ) {
+		if ( idal_cache[cachind] ) {
+			if ( kmem_cache_shrink(idal_cache[cachind]) == 0 ) {
+				idal_cache[cachind] = NULL;
+			}
+		}
+	}
+
+}