Pull context-bitmap into release branch

2 files changed, 44 insertions, 42 deletions

diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index 3af6de36a482..5add0bcf87a7 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -461,6 +461,7 @@ setup_arch (char **cmdline_p)
 #endif
 
         cpu_init();     /* initialize the bootstrap CPU */
+        mmu_context_init();     /* initialize context_id bitmap */
 
 #ifdef CONFIG_ACPI
         acpi_boot_init();
diff --git a/arch/ia64/mm/tlb.c b/arch/ia64/mm/tlb.c
index c79a9b96d02b..41105d454423 100644
--- a/arch/ia64/mm/tlb.c
+++ b/arch/ia64/mm/tlb.c
@@ -8,6 +8,8 @@
  *              Modified RID allocation for SMP
  *          Goutham Rao <goutham.rao@intel.com>
  *              IPI based ptc implementation and A-step IPI implementation.
+ * Rohit Seth <rohit.seth@intel.com>
+ * Ken Chen <kenneth.w.chen@intel.com>
  */
 #include <linux/config.h>
 #include <linux/module.h>
@@ -16,78 +18,75 @@
 #include <linux/sched.h>
 #include <linux/smp.h>
 #include <linux/mm.h>
+#include <linux/bootmem.h>
 
 #include <asm/delay.h>
 #include <asm/mmu_context.h>
 #include <asm/pgalloc.h>
 #include <asm/pal.h>
 #include <asm/tlbflush.h>
+#include <asm/dma.h>
 
 static struct {
         unsigned long mask;     /* mask of supported purge page-sizes */
-        unsigned long max_bits; /* log2() of largest supported purge page-size */
+        unsigned long max_bits; /* log2 of largest supported purge page-size */
 } purge;
 
 struct ia64_ctx ia64_ctx = {
         .lock =         SPIN_LOCK_UNLOCKED,
         .next =         1,
-        .limit =        (1 << 15) - 1,          /* start out with the safe (architected) limit */
         .max_ctx =      ~0U
 };
 
 DEFINE_PER_CPU(u8, ia64_need_tlb_flush);
 
 /*
+ * Initializes the ia64_ctx.bitmap array based on max_ctx+1.
+ * Called after cpu_init() has setup ia64_ctx.max_ctx based on
+ * maximum RID that is supported by boot CPU.
+ */
+void __init
+mmu_context_init (void)
+{
+        ia64_ctx.bitmap = alloc_bootmem((ia64_ctx.max_ctx+1)>>3);
+        ia64_ctx.flushmap = alloc_bootmem((ia64_ctx.max_ctx+1)>>3);
+}
+
+/*
  * Acquire the ia64_ctx.lock before calling this function!
  */
 void
 wrap_mmu_context (struct mm_struct *mm)
 {
-        unsigned long tsk_context, max_ctx = ia64_ctx.max_ctx;
-        struct task_struct *tsk;
-        int i;
+        int i, cpu;
+        unsigned long flush_bit;
 
-        if (ia64_ctx.next > max_ctx)
-                ia64_ctx.next = 300;    /* skip daemons */
-        ia64_ctx.limit = max_ctx + 1;
+        for (i=0; i <= ia64_ctx.max_ctx / BITS_PER_LONG; i++) {
+                flush_bit = xchg(&ia64_ctx.flushmap[i], 0);
+                ia64_ctx.bitmap[i] ^= flush_bit;
+        }
+ 
+        /* use offset at 300 to skip daemons */
+        ia64_ctx.next = find_next_zero_bit(ia64_ctx.bitmap,
+                                ia64_ctx.max_ctx, 300);
+        ia64_ctx.limit = find_next_bit(ia64_ctx.bitmap,
+                                ia64_ctx.max_ctx, ia64_ctx.next);
 
         /*
-         * Scan all the task's mm->context and set proper safe range
+         * can't call flush_tlb_all() here because of race condition
+         * with O(1) scheduler [EF]
          */
-
-        read_lock(&tasklist_lock);
-  repeat:
-        for_each_process(tsk) {
-                if (!tsk->mm)
-                        continue;
-                tsk_context = tsk->mm->context;
-                if (tsk_context == ia64_ctx.next) {
-                        if (++ia64_ctx.next >= ia64_ctx.limit) {
-                                /* empty range: reset the range limit and start over */
-                                if (ia64_ctx.next > max_ctx)
-                                        ia64_ctx.next = 300;
-                                ia64_ctx.limit = max_ctx + 1;
-                                goto repeat;
-                        }
-                }
-                if ((tsk_context > ia64_ctx.next) && (tsk_context < ia64_ctx.limit))
-                        ia64_ctx.limit = tsk_context;
-        }
-        read_unlock(&tasklist_lock);
-        /* can't call flush_tlb_all() here because of race condition with O(1) scheduler [EF] */
-        {
-                int cpu = get_cpu(); /* prevent preemption/migration */
-                for_each_online_cpu(i) {
-                        if (i != cpu)
-                                per_cpu(ia64_need_tlb_flush, i) = 1;
-                }
-                put_cpu();
-        }
+        cpu = get_cpu(); /* prevent preemption/migration */
+        for_each_online_cpu(i)
+                if (i != cpu)
+                        per_cpu(ia64_need_tlb_flush, i) = 1;
+        put_cpu();
         local_flush_tlb_all();
 }
 
 void
-ia64_global_tlb_purge (struct mm_struct *mm, unsigned long start, unsigned long end, unsigned long nbits)
+ia64_global_tlb_purge (struct mm_struct *mm, unsigned long start,
+                       unsigned long end, unsigned long nbits)
 {
         static DEFINE_SPINLOCK(ptcg_lock);
 
@@ -135,7 +134,8 @@ local_flush_tlb_all (void)
 }
 
 void
-flush_tlb_range (struct vm_area_struct *vma, unsigned long start, unsigned long end)
+flush_tlb_range (struct vm_area_struct *vma, unsigned long start,
+                 unsigned long end)
 {
         struct mm_struct *mm = vma->vm_mm;
         unsigned long size = end - start;
@@ -149,7 +149,8 @@ flush_tlb_range (struct vm_area_struct *vma, unsigned long start, unsigned long
 #endif
 
         nbits = ia64_fls(size + 0xfff);
-        while (unlikely (((1UL << nbits) & purge.mask) == 0) && (nbits < purge.max_bits))
+        while (unlikely (((1UL << nbits) & purge.mask) == 0) &&
+                        (nbits < purge.max_bits))
                 ++nbits;
         if (nbits > purge.max_bits)
                 nbits = purge.max_bits;
@@ -191,5 +192,5 @@ ia64_tlb_init (void)
         local_cpu_data->ptce_stride[0] = ptce_info.stride[0];
         local_cpu_data->ptce_stride[1] = ptce_info.stride[1];
 
-        local_flush_tlb_all();          /* nuke left overs from bootstrapping... */
+        local_flush_tlb_all();  /* nuke left overs from bootstrapping... */
 }