diff options
Diffstat (limited to 'usr/src/uts/sun4v/cpu/niagara.c')
| -rw-r--r-- | usr/src/uts/sun4v/cpu/niagara.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/usr/src/uts/sun4v/cpu/niagara.c b/usr/src/uts/sun4v/cpu/niagara.c index 3e797806fd..339c5373da 100644 --- a/usr/src/uts/sun4v/cpu/niagara.c +++ b/usr/src/uts/sun4v/cpu/niagara.c @@ -20,7 +20,7 @@ */ /* - * Copyright 2007 Sun Microsystems, Inc. All rights reserved. + * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ @@ -58,6 +58,7 @@ #include <sys/niagararegs.h> #include <sys/trapstat.h> #include <sys/hsvc.h> +#include <sys/mutex_impl.h> #define NI_MMU_PAGESIZE_MASK ((1 << TTE8K) | (1 << TTE64K) | (1 << TTE4M) \ | (1 << TTE256M)) @@ -199,6 +200,24 @@ cpu_map_exec_units(struct cpu *cp) cp->cpu_m.cpu_mpipe = 0; } +void +cpu_mutex_delay(void) +{ + /* + * Dummy is the thread-private target of the cas. If multiple strands + * have the same kernel call stack, dummy could fall at the same VA and + * hence the same L2 cache bank. To avoid this, create multiple dummy + * words spread across several cache lines. + */ + struct { + long val; + long pad[7]; + } dummy[4]; + + long *ptr = &(dummy[CPU->cpu_seqid & 0x03].val); + cas_delay(ptr); +} + static int niagara_cpucnt; void @@ -212,6 +231,8 @@ cpu_init_private(struct cpu *cp) if ((niagara_cpucnt++ == 0) && (niagara_hsvc_available == B_TRUE)) niagara_kstat_init(); + + mutex_delay = cpu_mutex_delay; } /*ARGSUSED*/ |