Pull context-bitmap into release branch

2 files changed, 48 insertions, 34 deletions

diff --git a/include/asm-ia64/mmu_context.h b/include/asm-ia64/mmu_context.h
index 8d6e72f..b5c6508 100644
--- a/include/asm-ia64/mmu_context.h
+++ b/include/asm-ia64/mmu_context.h
@@ -7,12 +7,13 @@
  */
 
 /*
- * Routines to manage the allocation of task context numbers.  Task context numbers are
- * used to reduce or eliminate the need to perform TLB flushes due to context switches.
- * Context numbers are implemented using ia-64 region ids.  Since the IA-64 TLB does not
- * consider the region number when performing a TLB lookup, we need to assign a unique
- * region id to each region in a process.  We use the least significant three bits in a
- * region id for this purpose.
+ * Routines to manage the allocation of task context numbers.  Task context
+ * numbers are used to reduce or eliminate the need to perform TLB flushes
+ * due to context switches.  Context numbers are implemented using ia-64
+ * region ids.  Since the IA-64 TLB does not consider the region number when
+ * performing a TLB lookup, we need to assign a unique region id to each
+ * region in a process.  We use the least significant three bits in aregion
+ * id for this purpose.
  */
 
 #define IA64_REGION_ID_KERNEL	0 /* the kernel's region id (tlb.c depends on this being 0) */
@@ -32,13 +33,17 @@
 struct ia64_ctx {
 	spinlock_t lock;
 	unsigned int next;	/* next context number to use */
-	unsigned int limit;	/* next >= limit => must call wrap_mmu_context() */
-	unsigned int max_ctx;	/* max. context value supported by all CPUs */
+	unsigned int limit;     /* available free range */
+	unsigned int max_ctx;   /* max. context value supported by all CPUs */
+				/* call wrap_mmu_context when next >= max */
+	unsigned long *bitmap;  /* bitmap size is max_ctx+1 */
+	unsigned long *flushmap;/* pending rid to be flushed */
 };
 
 extern struct ia64_ctx ia64_ctx;
 DECLARE_PER_CPU(u8, ia64_need_tlb_flush);
 
+extern void mmu_context_init (void);
 extern void wrap_mmu_context (struct mm_struct *mm);
 
 static inline void
@@ -47,10 +52,10 @@ enter_lazy_tlb (struct mm_struct *mm, struct task_struct *tsk)
 }
 
 /*
- * When the context counter wraps around all TLBs need to be flushed because an old
- * context number might have been reused. This is signalled by the ia64_need_tlb_flush
- * per-CPU variable, which is checked in the routine below. Called by activate_mm().
- * <efocht@ess.nec.de>
+ * When the context counter wraps around all TLBs need to be flushed because
+ * an old context number might have been reused. This is signalled by the
+ * ia64_need_tlb_flush per-CPU variable, which is checked in the routine
+ * below. Called by activate_mm(). <efocht@ess.nec.de>
  */
 static inline void
 delayed_tlb_flush (void)
@@ -60,11 +65,9 @@ delayed_tlb_flush (void)
 
 	if (unlikely(__ia64_per_cpu_var(ia64_need_tlb_flush))) {
 		spin_lock_irqsave(&ia64_ctx.lock, flags);
-		{
-			if (__ia64_per_cpu_var(ia64_need_tlb_flush)) {
-				local_flush_tlb_all();
-				__ia64_per_cpu_var(ia64_need_tlb_flush) = 0;
-			}
+		if (__ia64_per_cpu_var(ia64_need_tlb_flush)) {
+			local_flush_tlb_all();
+			__ia64_per_cpu_var(ia64_need_tlb_flush) = 0;
 		}
 		spin_unlock_irqrestore(&ia64_ctx.lock, flags);
 	}
@@ -76,20 +79,27 @@ get_mmu_context (struct mm_struct *mm)
 	unsigned long flags;
 	nv_mm_context_t context = mm->context;
 
-	if (unlikely(!context)) {
-		spin_lock_irqsave(&ia64_ctx.lock, flags);
-		{
-			/* re-check, now that we've got the lock: */
-			context = mm->context;
-			if (context == 0) {
-				cpus_clear(mm->cpu_vm_mask);
-				if (ia64_ctx.next >= ia64_ctx.limit)
-					wrap_mmu_context(mm);
-				mm->context = context = ia64_ctx.next++;
-			}
+	if (likely(context))
+		goto out;
+
+	spin_lock_irqsave(&ia64_ctx.lock, flags);
+	/* re-check, now that we've got the lock: */
+	context = mm->context;
+	if (context == 0) {
+		cpus_clear(mm->cpu_vm_mask);
+		if (ia64_ctx.next >= ia64_ctx.limit) {
+			ia64_ctx.next = find_next_zero_bit(ia64_ctx.bitmap,
+					ia64_ctx.max_ctx, ia64_ctx.next);
+			ia64_ctx.limit = find_next_bit(ia64_ctx.bitmap,
+					ia64_ctx.max_ctx, ia64_ctx.next);
+			if (ia64_ctx.next >= ia64_ctx.max_ctx)
+				wrap_mmu_context(mm);
 		}
-		spin_unlock_irqrestore(&ia64_ctx.lock, flags);
+		mm->context = context = ia64_ctx.next++;
+		__set_bit(context, ia64_ctx.bitmap);
 	}
+	spin_unlock_irqrestore(&ia64_ctx.lock, flags);
+out:
 	/*
 	 * Ensure we're not starting to use "context" before any old
 	 * uses of it are gone from our TLB.
@@ -100,8 +110,8 @@ get_mmu_context (struct mm_struct *mm)
 }
 
 /*
- * Initialize context number to some sane value.  MM is guaranteed to be a brand-new
- * address-space, so no TLB flushing is needed, ever.
+ * Initialize context number to some sane value.  MM is guaranteed to be a
+ * brand-new address-space, so no TLB flushing is needed, ever.
  */
 static inline int
 init_new_context (struct task_struct *p, struct mm_struct *mm)
@@ -162,7 +172,10 @@ activate_context (struct mm_struct *mm)
 		if (!cpu_isset(smp_processor_id(), mm->cpu_vm_mask))
 			cpu_set(smp_processor_id(), mm->cpu_vm_mask);
 		reload_context(context);
-		/* in the unlikely event of a TLB-flush by another thread, redo the load: */
+		/*
+		 * in the unlikely event of a TLB-flush by another thread,
+		 * redo the load.
+		 */
 	} while (unlikely(context != mm->context));
 }
 
@@ -175,8 +188,8 @@ static inline void
 activate_mm (struct mm_struct *prev, struct mm_struct *next)
 {
 	/*
-	 * We may get interrupts here, but that's OK because interrupt handlers cannot
-	 * touch user-space.
+	 * We may get interrupts here, but that's OK because interrupt
+	 * handlers cannot touch user-space.
 	 */
 	ia64_set_kr(IA64_KR_PT_BASE, __pa(next->pgd));
 	activate_context(next);
diff --git a/include/asm-ia64/tlbflush.h b/include/asm-ia64/tlbflush.h
index b65c627..a35b323 100644
--- a/include/asm-ia64/tlbflush.h
+++ b/include/asm-ia64/tlbflush.h
@@ -51,6 +51,7 @@ flush_tlb_mm (struct mm_struct *mm)
 	if (!mm)
 		return;
 
+	set_bit(mm->context, ia64_ctx.flushmap);
 	mm->context = 0;
 
 	if (atomic_read(&mm->mm_users) == 0)