Merge branch 'bkl-removal' into next

[pandora-kernel.git] / arch / powerpc / mm / tlb_64.c

diff --git a/arch/powerpc/mm/tlb_64.c b/arch/powerpc/mm/tlb_64.c
index 2bfc4d7..69ad829 100644 (file)
--- a/arch/powerpc/mm/tlb_64.c
+++ b/arch/powerpc/mm/tlb_64.c
@@ -8,7 +8,6 @@
  *  Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
  *  and Cort Dougan (PReP) (cort@cs.nmt.edu)
  *    Copyright (C) 1996 Paul Mackerras
- *  Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
  *
  *  Derived from "arch/i386/mm/init.c"
  *    Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
@@ -55,12 +54,10 @@ unsigned long pte_freelist_forced_free;
        ((PAGE_SIZE - sizeof(struct pte_freelist_batch)) \
          / sizeof(pgtable_free_t))
 
-#ifdef CONFIG_SMP
 static void pte_free_smp_sync(void *arg)
 {
        /* Do nothing, just ensure we sync with all CPUs */
 }
-#endif
 
 /* This is only called when we are critically out of memory
  * (and fail to get a page in pte_free_tlb).
@@ -69,7 +66,7 @@ static void pgtable_free_now(pgtable_free_t pgf)
 {
        pte_freelist_forced_free++;
 
-       smp_call_function(pte_free_smp_sync, NULL, 0, 1);
+       smp_call_function(pte_free_smp_sync, NULL, 1);
 
        pgtable_free(pgf);
 }
@@ -133,6 +130,7 @@ void hpte_need_flush(struct mm_struct *mm, unsigned long addr,
        struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
        unsigned long vsid, vaddr;
        unsigned int psize;
+       int ssize;
        real_pte_t rpte;
        int i;
 
@@ -162,11 +160,14 @@ void hpte_need_flush(struct mm_struct *mm, unsigned long addr,
 
        /* Build full vaddr */
        if (!is_kernel_addr(addr)) {
-               vsid = get_vsid(mm->context.id, addr);
+               ssize = user_segment_size(addr);
+               vsid = get_vsid(mm->context.id, addr, ssize);
                WARN_ON(vsid == 0);
-       } else
-               vsid = get_kernel_vsid(addr);
-       vaddr = (vsid << 28 ) | (addr & 0x0fffffff);
+       } else {
+               vsid = get_kernel_vsid(addr, mmu_kernel_ssize);
+               ssize = mmu_kernel_ssize;
+       }
+       vaddr = hpt_va(addr, vsid, ssize);
        rpte = __real_pte(__pte(pte), ptep);
 
        /*
@@ -176,7 +177,7 @@ void hpte_need_flush(struct mm_struct *mm, unsigned long addr,
         * and decide to use local invalidates instead...
         */
        if (!batch->active) {
-               flush_hash_page(vaddr, rpte, psize, 0);
+               flush_hash_page(vaddr, rpte, psize, ssize, 0);
                return;
        }
 
@@ -190,13 +191,15 @@ void hpte_need_flush(struct mm_struct *mm, unsigned long addr,
         * We also need to ensure only one page size is present in a given
         * batch
         */
-       if (i != 0 && (mm != batch->mm || batch->psize != psize)) {
+       if (i != 0 && (mm != batch->mm || batch->psize != psize ||
+                      batch->ssize != ssize)) {
                __flush_tlb_pending(batch);
                i = 0;
        }
        if (i == 0) {
                batch->mm = mm;
                batch->psize = psize;
+               batch->ssize = ssize;
        }
        batch->pte[i] = rpte;
        batch->vaddr[i] = vaddr;
@@ -223,7 +226,7 @@ void __flush_tlb_pending(struct ppc64_tlb_batch *batch)
                local = 1;
        if (i == 1)
                flush_hash_page(batch->vaddr[0], batch->pte[0],
-                               batch->psize, local);
+                               batch->psize, batch->ssize, local);
        else
                flush_hash_range(i, local);
        batch->index = 0;
@@ -239,3 +242,59 @@ void pte_free_finish(void)
        pte_free_submit(*batchp);
        *batchp = NULL;
 }
+
+/**
+ * __flush_hash_table_range - Flush all HPTEs for a given address range
+ *                            from the hash table (and the TLB). But keeps
+ *                            the linux PTEs intact.
+ *
+ * @mm         : mm_struct of the target address space (generally init_mm)
+ * @start      : starting address
+ * @end         : ending address (not included in the flush)
+ *
+ * This function is mostly to be used by some IO hotplug code in order
+ * to remove all hash entries from a given address range used to map IO
+ * space on a removed PCI-PCI bidge without tearing down the full mapping
+ * since 64K pages may overlap with other bridges when using 64K pages
+ * with 4K HW pages on IO space.
+ *
+ * Because of that usage pattern, it's only available with CONFIG_HOTPLUG
+ * and is implemented for small size rather than speed.
+ */
+#ifdef CONFIG_HOTPLUG
+
+void __flush_hash_table_range(struct mm_struct *mm, unsigned long start,
+                             unsigned long end)
+{
+       unsigned long flags;
+
+       start = _ALIGN_DOWN(start, PAGE_SIZE);
+       end = _ALIGN_UP(end, PAGE_SIZE);
+
+       BUG_ON(!mm->pgd);
+
+       /* Note: Normally, we should only ever use a batch within a
+        * PTE locked section. This violates the rule, but will work
+        * since we don't actually modify the PTEs, we just flush the
+        * hash while leaving the PTEs intact (including their reference
+        * to being hashed). This is not the most performance oriented
+        * way to do things but is fine for our needs here.
+        */
+       local_irq_save(flags);
+       arch_enter_lazy_mmu_mode();
+       for (; start < end; start += PAGE_SIZE) {
+               pte_t *ptep = find_linux_pte(mm->pgd, start);
+               unsigned long pte;
+
+               if (ptep == NULL)
+                       continue;
+               pte = pte_val(*ptep);
+               if (!(pte & _PAGE_HASHPTE))
+                       continue;
+               hpte_need_flush(mm, start, ptep, pte, 0);
+       }
+       arch_leave_lazy_mmu_mode();
+       local_irq_restore(flags);
+}
+
+#endif /* CONFIG_HOTPLUG */