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authorPaul Mundt <lethal@linux-sh.org>2006-12-25 09:51:47 +0900
committerPaul Mundt <lethal@linux-sh.org>2007-02-13 10:54:45 +0900
commitaec5e0e1c179fac4bbca4007a3f0d3107275a73c (patch)
tree3b251e52a89445a5546f398fb16a002435b6c2b6 /arch/sh/mm
parent506b85f4114b912d2e91fab8da9849289e43857f (diff)
downloadlinux-2.6.34-ux500-aec5e0e1c179fac4bbca4007a3f0d3107275a73c.tar.gz
sh: Use a per-cpu ASID cache.
Previously this was implemented using a global cache, cache this per-CPU instead and bump up the number of context IDs to match NR_CPUS. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/mm')
-rw-r--r--arch/sh/mm/init.c5
-rw-r--r--arch/sh/mm/tlb-flush.c26
2 files changed, 16 insertions, 15 deletions
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index bf0c263cb6f..d172065182f 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -39,11 +39,6 @@
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
pgd_t swapper_pg_dir[PTRS_PER_PGD];
-/*
- * Cache of MMU context last used.
- */
-unsigned long mmu_context_cache = NO_CONTEXT;
-
#ifdef CONFIG_MMU
/* It'd be good if these lines were in the standard header file. */
#define START_PFN (NODE_DATA(0)->bdata->node_boot_start >> PAGE_SHIFT)
diff --git a/arch/sh/mm/tlb-flush.c b/arch/sh/mm/tlb-flush.c
index ef3e4d47786..b829c17c1d1 100644
--- a/arch/sh/mm/tlb-flush.c
+++ b/arch/sh/mm/tlb-flush.c
@@ -16,12 +16,14 @@
void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
{
- if (vma->vm_mm && vma->vm_mm->context.id != NO_CONTEXT) {
+ unsigned int cpu = smp_processor_id();
+
+ if (vma->vm_mm && cpu_context(cpu, vma->vm_mm) != NO_CONTEXT) {
unsigned long flags;
unsigned long asid;
unsigned long saved_asid = MMU_NO_ASID;
- asid = vma->vm_mm->context.id & MMU_CONTEXT_ASID_MASK;
+ asid = cpu_asid(cpu, vma->vm_mm);
page &= PAGE_MASK;
local_irq_save(flags);
@@ -40,22 +42,23 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end)
{
struct mm_struct *mm = vma->vm_mm;
+ unsigned int cpu = smp_processor_id();
- if (mm->context.id != NO_CONTEXT) {
+ if (cpu_context(cpu, mm) != NO_CONTEXT) {
unsigned long flags;
int size;
local_irq_save(flags);
size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
if (size > (MMU_NTLB_ENTRIES/4)) { /* Too many TLB to flush */
- mm->context.id = NO_CONTEXT;
+ cpu_context(cpu, mm) = NO_CONTEXT;
if (mm == current->mm)
- activate_context(mm);
+ activate_context(mm, cpu);
} else {
unsigned long asid;
unsigned long saved_asid = MMU_NO_ASID;
- asid = mm->context.id & MMU_CONTEXT_ASID_MASK;
+ asid = cpu_asid(cpu, mm);
start &= PAGE_MASK;
end += (PAGE_SIZE - 1);
end &= PAGE_MASK;
@@ -76,6 +79,7 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
+ unsigned int cpu = smp_processor_id();
unsigned long flags;
int size;
@@ -87,7 +91,7 @@ void flush_tlb_kernel_range(unsigned long start, unsigned long end)
unsigned long asid;
unsigned long saved_asid = get_asid();
- asid = init_mm.context.id & MMU_CONTEXT_ASID_MASK;
+ asid = cpu_asid(cpu, &init_mm);
start &= PAGE_MASK;
end += (PAGE_SIZE - 1);
end &= PAGE_MASK;
@@ -103,15 +107,17 @@ void flush_tlb_kernel_range(unsigned long start, unsigned long end)
void flush_tlb_mm(struct mm_struct *mm)
{
+ unsigned int cpu = smp_processor_id();
+
/* Invalidate all TLB of this process. */
/* Instead of invalidating each TLB, we get new MMU context. */
- if (mm->context.id != NO_CONTEXT) {
+ if (cpu_context(cpu, mm) != NO_CONTEXT) {
unsigned long flags;
local_irq_save(flags);
- mm->context.id = NO_CONTEXT;
+ cpu_context(cpu, mm) = NO_CONTEXT;
if (mm == current->mm)
- activate_context(mm);
+ activate_context(mm, cpu);
local_irq_restore(flags);
}
}