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remove unnecessary locking overhead for UP

This commit is contained in:
cherry 2011-08-13 11:41:57 +00:00
parent 86658a2f92
commit 787e5fb097
2 changed files with 37 additions and 20 deletions
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10
sys/arch/xen/include/xenpmap.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: xenpmap.h,v 1.28 2011/08/10 09:50:37 cherry Exp $ */
/* $NetBSD: xenpmap.h,v 1.29 2011/08/13 11:41:57 cherry Exp $ */
/*
*
@ -36,8 +36,16 @@
#define INVALID_P2M_ENTRY (~0UL)
#ifdef MULTIPROCESSOR
void xpq_queue_lock(void);
void xpq_queue_unlock(void);
bool xpq_queue_locked(void);
#else /* MULTIPROCESSOR */
#define xpq_queue_lock() do {} while(0) /* nothing */
#define xpq_queue_unlock() do {} while(0) /* nothing */
#define xpq_queue_locked() (true) /* Always true for UP */
#endif /* MULTIPROCESSOR */
void xpq_queue_machphys_update(paddr_t, paddr_t);
void xpq_queue_invlpg(vaddr_t);
void xpq_queue_pte_update(paddr_t, pt_entry_t);

47
sys/arch/xen/x86/x86_xpmap.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: x86_xpmap.c,v 1.29 2011/08/10 09:50:37 cherry Exp $ */
/* $NetBSD: x86_xpmap.c,v 1.30 2011/08/13 11:41:57 cherry Exp $ */
/*
* Copyright (c) 2006 Mathieu Ropert <mro@adviseo.fr>
@ -69,7 +69,7 @@
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: x86_xpmap.c,v 1.29 2011/08/10 09:50:37 cherry Exp $");
__KERNEL_RCSID(0, "$NetBSD: x86_xpmap.c,v 1.30 2011/08/13 11:41:57 cherry Exp $");
#include "opt_xen.h"
#include "opt_ddb.h"
@ -166,6 +166,8 @@ void xpq_debug_dump(void);
#define XPQUEUE_SIZE 2048
static mmu_update_t xpq_queue[XPQUEUE_SIZE];
static int xpq_idx = 0;
#ifdef MULTIPROCESSOR
static struct simplelock xpq_lock = SIMPLELOCK_INITIALIZER;
void
@ -180,13 +182,20 @@ xpq_queue_unlock(void)
simple_unlock(&xpq_lock);
}
bool
xpq_queue_locked(void)
{
return xpq_queue_locked();
}
#endif /* MULTIPROCESSOR */
/* Must be called with xpq_lock held */
void
xpq_flush_queue(void)
{
int i, ok, ret;
KASSERT(simple_lock_held(&xpq_lock));
KASSERT(xpq_queue_locked());
XENPRINTK2(("flush queue %p entries %d\n", xpq_queue, xpq_idx));
for (i = 0; i < xpq_idx; i++)
XENPRINTK2(("%d: 0x%08" PRIx64 " 0x%08" PRIx64 "\n", i,
@ -210,7 +219,7 @@ static inline void
xpq_increment_idx(void)
{
KASSERT(simple_lock_held(&xpq_lock));
KASSERT(xpq_queue_locked());
xpq_idx++;
if (__predict_false(xpq_idx == XPQUEUE_SIZE))
xpq_flush_queue();
@ -221,7 +230,7 @@ xpq_queue_machphys_update(paddr_t ma, paddr_t pa)
{
XENPRINTK2(("xpq_queue_machphys_update ma=0x%" PRIx64 " pa=0x%" PRIx64
"\n", (int64_t)ma, (int64_t)pa));
KASSERT(simple_lock_held(&xpq_lock));
KASSERT(xpq_queue_locked());
xpq_queue[xpq_idx].ptr = ma | MMU_MACHPHYS_UPDATE;
xpq_queue[xpq_idx].val = (pa - XPMAP_OFFSET) >> PAGE_SHIFT;
xpq_increment_idx();
@ -235,7 +244,7 @@ xpq_queue_pte_update(paddr_t ptr, pt_entry_t val)
{
KASSERT((ptr & 3) == 0);
KASSERT(simple_lock_held(&xpq_lock));
KASSERT(xpq_queue_locked());
xpq_queue[xpq_idx].ptr = (paddr_t)ptr | MMU_NORMAL_PT_UPDATE;
xpq_queue[xpq_idx].val = val;
xpq_increment_idx();
@ -248,7 +257,7 @@ void
xpq_queue_pt_switch(paddr_t pa)
{
struct mmuext_op op;
KASSERT(simple_lock_held(&xpq_lock));
KASSERT(xpq_queue_locked());
xpq_flush_queue();
XENPRINTK2(("xpq_queue_pt_switch: 0x%" PRIx64 " 0x%" PRIx64 "\n",
@ -264,7 +273,7 @@ xpq_queue_pin_table(paddr_t pa, int lvl)
{
struct mmuext_op op;
KASSERT(simple_lock_held(&xpq_lock));
KASSERT(xpq_queue_locked());
xpq_flush_queue();
XENPRINTK2(("xpq_queue_pin_l%d_table: %#" PRIxPADDR "\n",
@ -282,7 +291,7 @@ xpq_queue_unpin_table(paddr_t pa)
{
struct mmuext_op op;
KASSERT(simple_lock_held(&xpq_lock));
KASSERT(xpq_queue_locked());
xpq_flush_queue();
XENPRINTK2(("xpq_queue_unpin_table: %#" PRIxPADDR "\n", pa));
@ -297,7 +306,7 @@ xpq_queue_set_ldt(vaddr_t va, uint32_t entries)
{
struct mmuext_op op;
KASSERT(simple_lock_held(&xpq_lock));
KASSERT(xpq_queue_locked());
xpq_flush_queue();
XENPRINTK2(("xpq_queue_set_ldt\n"));
@ -314,7 +323,7 @@ xpq_queue_tlb_flush(void)
{
struct mmuext_op op;
KASSERT(simple_lock_held(&xpq_lock));
KASSERT(xpq_queue_locked());
xpq_flush_queue();
XENPRINTK2(("xpq_queue_tlb_flush\n"));
@ -345,7 +354,7 @@ void
xpq_queue_invlpg(vaddr_t va)
{
struct mmuext_op op;
KASSERT(simple_lock_held(&xpq_lock));
KASSERT(xpq_queue_locked());
xpq_flush_queue();
XENPRINTK2(("xpq_queue_invlpg %#" PRIxVADDR "\n", va));
@ -360,7 +369,7 @@ xen_mcast_invlpg(vaddr_t va, uint32_t cpumask)
{
mmuext_op_t op;
KASSERT(simple_lock_held(&xpq_lock));
KASSERT(xpq_queue_locked());
/* Flush pending page updates */
xpq_flush_queue();
@ -382,7 +391,7 @@ xen_bcast_invlpg(vaddr_t va)
mmuext_op_t op;
/* Flush pending page updates */
KASSERT(simple_lock_held(&xpq_lock));
KASSERT(xpq_queue_locked());
xpq_flush_queue();
op.cmd = MMUEXT_INVLPG_ALL;
@ -402,7 +411,7 @@ xen_mcast_tlbflush(uint32_t cpumask)
mmuext_op_t op;
/* Flush pending page updates */
KASSERT(simple_lock_held(&xpq_lock));
KASSERT(xpq_queue_locked());
xpq_flush_queue();
op.cmd = MMUEXT_TLB_FLUSH_MULTI;
@ -422,7 +431,7 @@ xen_bcast_tlbflush(void)
mmuext_op_t op;
/* Flush pending page updates */
KASSERT(simple_lock_held(&xpq_lock));
KASSERT(xpq_queue_locked());
xpq_flush_queue();
op.cmd = MMUEXT_TLB_FLUSH_ALL;
@ -441,7 +450,7 @@ xen_vcpu_mcast_invlpg(vaddr_t sva, vaddr_t eva, uint32_t cpumask)
KASSERT(eva > sva);
/* Flush pending page updates */
KASSERT(simple_lock_held(&xpq_lock));
KASSERT(xpq_queue_locked());
xpq_flush_queue();
/* Align to nearest page boundary */
@ -462,7 +471,7 @@ xen_vcpu_bcast_invlpg(vaddr_t sva, vaddr_t eva)
KASSERT(eva > sva);
/* Flush pending page updates */
KASSERT(simple_lock_held(&xpq_lock));
KASSERT(xpq_queue_locked());
xpq_flush_queue();
/* Align to nearest page boundary */
@ -482,7 +491,7 @@ xpq_update_foreign(paddr_t ptr, pt_entry_t val, int dom)
mmu_update_t op;
int ok;
KASSERT(simple_lock_held(&xpq_lock));
KASSERT(xpq_queue_locked());
xpq_flush_queue();
op.ptr = ptr;