powerpc: Support for relocatable kdump kernel

[linux-2.6-omap-h63xx.git] / arch / powerpc / kernel / iommu.c

diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index ea1ba89f9c9001ccff8b2d5256d09fe17dafd4c7..3857d7e2af0cab9513c72262f2e6372c66bf31c9 100644 (file)
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -458,6 +458,42 @@ void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
        spin_unlock_irqrestore(&(tbl->it_lock), flags);
 }
 
+static void iommu_table_clear(struct iommu_table *tbl)
+{
+       if (!__kdump_flag) {
+               /* Clear the table in case firmware left allocations in it */
+               ppc_md.tce_free(tbl, tbl->it_offset, tbl->it_size);
+               return;
+       }
+
+#ifdef CONFIG_CRASH_DUMP
+       if (ppc_md.tce_get) {
+               unsigned long index, tceval, tcecount = 0;
+
+               /* Reserve the existing mappings left by the first kernel. */
+               for (index = 0; index < tbl->it_size; index++) {
+                       tceval = ppc_md.tce_get(tbl, index + tbl->it_offset);
+                       /*
+                        * Freed TCE entry contains 0x7fffffffffffffff on JS20
+                        */
+                       if (tceval && (tceval != 0x7fffffffffffffffUL)) {
+                               __set_bit(index, tbl->it_map);
+                               tcecount++;
+                       }
+               }
+
+               if ((tbl->it_size - tcecount) < KDUMP_MIN_TCE_ENTRIES) {
+                       printk(KERN_WARNING "TCE table is full; freeing ");
+                       printk(KERN_WARNING "%d entries for the kdump boot\n",
+                               KDUMP_MIN_TCE_ENTRIES);
+                       for (index = tbl->it_size - KDUMP_MIN_TCE_ENTRIES;
+                               index < tbl->it_size; index++)
+                               __clear_bit(index, tbl->it_map);
+               }
+       }
+#endif
+}
+
 /*
  * Build a iommu_table structure.  This contains a bit map which
  * is used to manage allocation of the tce space.
@@ -484,38 +520,7 @@ struct iommu_table *iommu_init_table(struct iommu_table *tbl, int nid)
        tbl->it_largehint = tbl->it_halfpoint;
        spin_lock_init(&tbl->it_lock);
 
-#ifdef CONFIG_CRASH_DUMP
-       if (ppc_md.tce_get) {
-               unsigned long index;
-               unsigned long tceval;
-               unsigned long tcecount = 0;
-
-               /*
-                * Reserve the existing mappings left by the first kernel.
-                */
-               for (index = 0; index < tbl->it_size; index++) {
-                       tceval = ppc_md.tce_get(tbl, index + tbl->it_offset);
-                       /*
-                        * Freed TCE entry contains 0x7fffffffffffffff on JS20
-                        */
-                       if (tceval && (tceval != 0x7fffffffffffffffUL)) {
-                               __set_bit(index, tbl->it_map);
-                               tcecount++;
-                       }
-               }
-               if ((tbl->it_size - tcecount) < KDUMP_MIN_TCE_ENTRIES) {
-                       printk(KERN_WARNING "TCE table is full; ");
-                       printk(KERN_WARNING "freeing %d entries for the kdump boot\n",
-                               KDUMP_MIN_TCE_ENTRIES);
-                       for (index = tbl->it_size - KDUMP_MIN_TCE_ENTRIES;
-                               index < tbl->it_size; index++)
-                               __clear_bit(index, tbl->it_map);
-               }
-       }
-#else
-       /* Clear the hardware table in case firmware left allocations in it */
-       ppc_md.tce_free(tbl, tbl->it_offset, tbl->it_size);
-#endif
+       iommu_table_clear(tbl);
 
        if (!welcomed) {
                printk(KERN_INFO "IOMMU table initialized, virtual merging %s\n",