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authorRalf Baechle <ralf@linux-mips.org>2006-06-22 22:42:32 +0100
committerRalf Baechle <ralf@linux-mips.org>2006-07-13 21:25:56 +0100
commit25969354a385f347b55aafb1040dfc21263fa7c3 (patch)
tree1ba512ac5f4984260c32b02594e70fbefa6b9894 /arch/mips/kernel/smp.c
parentf1aaee53f2877a7afa55e8245c241ff60a86367d (diff)
downloadop-kernel-dev-25969354a385f347b55aafb1040dfc21263fa7c3.zip
op-kernel-dev-25969354a385f347b55aafb1040dfc21263fa7c3.tar.gz
[MIPS] Avoid interprocessor function calls.
On the 34K where multiple virtual processors are implemented in a single core and share a single TLB, interprocessor function calls are not needed to flush a cache, so avoid them. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/smp.c')
-rw-r--r--arch/mips/kernel/smp.c35
1 files changed, 30 insertions, 5 deletions
diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index 9096a5e..2218958 100644
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -319,6 +319,32 @@ static void flush_tlb_mm_ipi(void *mm)
}
/*
+ * Special Variant of smp_call_function for use by TLB functions:
+ *
+ * o No return value
+ * o collapses to normal function call on UP kernels
+ * o collapses to normal function call on systems with a single shared
+ * primary cache.
+ * o CONFIG_MIPS_MT_SMTC currently implies there is only one physical core.
+ */
+static inline void smp_on_other_tlbs(void (*func) (void *info), void *info)
+{
+#ifndef CONFIG_MIPS_MT_SMTC
+ smp_call_function(func, info, 1, 1);
+#endif
+}
+
+static inline void smp_on_each_tlb(void (*func) (void *info), void *info)
+{
+ preempt_disable();
+
+ smp_on_other_tlbs(func, info);
+ func(info);
+
+ preempt_enable();
+}
+
+/*
* The following tlb flush calls are invoked when old translations are
* being torn down, or pte attributes are changing. For single threaded
* address spaces, a new context is obtained on the current cpu, and tlb
@@ -336,7 +362,7 @@ void flush_tlb_mm(struct mm_struct *mm)
preempt_disable();
if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
- smp_call_function(flush_tlb_mm_ipi, (void *)mm, 1, 1);
+ smp_on_other_tlbs(flush_tlb_mm_ipi, (void *)mm);
} else {
int i;
for (i = 0; i < num_online_cpus(); i++)
@@ -372,7 +398,7 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned l
fd.vma = vma;
fd.addr1 = start;
fd.addr2 = end;
- smp_call_function(flush_tlb_range_ipi, (void *)&fd, 1, 1);
+ smp_on_other_tlbs(flush_tlb_range_ipi, (void *)&fd);
} else {
int i;
for (i = 0; i < num_online_cpus(); i++)
@@ -414,7 +440,7 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
fd.vma = vma;
fd.addr1 = page;
- smp_call_function(flush_tlb_page_ipi, (void *)&fd, 1, 1);
+ smp_on_other_tlbs(flush_tlb_page_ipi, (void *)&fd);
} else {
int i;
for (i = 0; i < num_online_cpus(); i++)
@@ -434,8 +460,7 @@ static void flush_tlb_one_ipi(void *info)
void flush_tlb_one(unsigned long vaddr)
{
- smp_call_function(flush_tlb_one_ipi, (void *) vaddr, 1, 1);
- local_flush_tlb_one(vaddr);
+ smp_on_each_tlb(flush_tlb_one_ipi, (void *) vaddr);
}
static DEFINE_PER_CPU(struct cpu, cpu_devices);
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