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authorFenghua Yu <fenghua.yu@intel.com>2008-04-04 11:05:59 -0700
committerTony Luck <tony.luck@intel.com>2008-04-04 11:05:59 -0700
commit2046b94e7c4fce92eb8165c2c36c6478f4927178 (patch)
tree0dbbdf17d64b521f2debcc8677368ceec8805d8c /arch/ia64/kernel/setup.c
parente315c121a858499d84dc88c499046b9f10bb61ec (diff)
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[IA64] Multiple outstanding ptc.g instruction support
According to SDM2.2, Itanium supports multiple outstanding ptc.g instructions. But current kernel function ia64_global_tlb_purge() uses a spinlock to serialize ptc.g instructions issued by multiple processors. This serialization might have scalability issue on a big SMP machine where many processors could purge TLB in parallel. The patch fixes this problem by issuing multiple ptc.g instructions in ia64_global_tlb_purge(). It also adds support for the "PALO" table to get a platform view of the max number of outstanding ptc.g instructions (which may be different from the processor view found from PAL_VM_SUMMARY). PALO specification can be found at: http://www.dig64.org/home/DIG64_PALO_R1_0.pdf spinaphore implementation by Matthew Wilcox. Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/kernel/setup.c')
-rw-r--r--arch/ia64/kernel/setup.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index 4aa9eaea76c3..1cbd26340d87 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -59,6 +59,7 @@
#include <asm/setup.h>
#include <asm/smp.h>
#include <asm/system.h>
+#include <asm/tlbflush.h>
#include <asm/unistd.h>
#include <asm/hpsim.h>
@@ -946,9 +947,10 @@ cpu_init (void)
#endif
/* set ia64_ctx.max_rid to the maximum RID that is supported by all CPUs: */
- if (ia64_pal_vm_summary(NULL, &vmi) == 0)
+ if (ia64_pal_vm_summary(NULL, &vmi) == 0) {
max_ctx = (1U << (vmi.pal_vm_info_2_s.rid_size - 3)) - 1;
- else {
+ setup_ptcg_sem(vmi.pal_vm_info_2_s.max_purges, 0);
+ } else {
printk(KERN_WARNING "cpu_init: PAL VM summary failed, assuming 18 RID bits\n");
max_ctx = (1U << 15) - 1; /* use architected minimum */
}