1 files changed, 26 insertions, 87 deletions

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 0a64fffabee1..f6787f90e158 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -69,22 +69,14 @@ pte_t *kmap_pte;
 EXPORT_SYMBOL(kmap_pte);
 pgprot_t kmap_prot;
 EXPORT_SYMBOL(kmap_prot);
-#define TOP_ZONE ZONE_HIGHMEM
 
 static inline pte_t *virt_to_kpte(unsigned long vaddr)
 {
 	return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
 			vaddr), vaddr), vaddr);
 }
-#else
-#define TOP_ZONE ZONE_NORMAL
 #endif
 
-int page_is_ram(unsigned long pfn)
-{
-	return memblock_is_memory(__pfn_to_phys(pfn));
-}
-
 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 			      unsigned long size, pgprot_t vma_prot)
 {
@@ -139,7 +131,8 @@ int __meminit arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *
 }
 
 #ifdef CONFIG_MEMORY_HOTREMOVE
-int __meminit arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
+int __meminit arch_remove_memory(int nid, u64 start, u64 size,
+					struct vmem_altmap *altmap)
 {
 	unsigned long start_pfn = start >> PAGE_SHIFT;
 	unsigned long nr_pages = size >> PAGE_SHIFT;
@@ -175,34 +168,6 @@ int __meminit arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap
 #endif
 #endif /* CONFIG_MEMORY_HOTPLUG */
 
-/*
- * walk_memory_resource() needs to make sure there is no holes in a given
- * memory range.  PPC64 does not maintain the memory layout in /proc/iomem.
- * Instead it maintains it in memblock.memory structures.  Walk through the
- * memory regions, find holes and callback for contiguous regions.
- */
-int
-walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
-		void *arg, int (*func)(unsigned long, unsigned long, void *))
-{
-	struct memblock_region *reg;
-	unsigned long end_pfn = start_pfn + nr_pages;
-	unsigned long tstart, tend;
-	int ret = -1;
-
-	for_each_memblock(memory, reg) {
-		tstart = max(start_pfn, memblock_region_memory_base_pfn(reg));
-		tend = min(end_pfn, memblock_region_memory_end_pfn(reg));
-		if (tstart >= tend)
-			continue;
-		ret = (*func)(tstart, tend - tstart, arg);
-		if (ret)
-			break;
-	}
-	return ret;
-}
-EXPORT_SYMBOL_GPL(walk_system_ram_range);
-
 #ifndef CONFIG_NEED_MULTIPLE_NODES
 void __init mem_topology_setup(void)
 {
@@ -246,54 +211,19 @@ static int __init mark_nonram_nosave(void)
 }
 #endif
 
-static bool zone_limits_final;
-
-/*
- * The memory zones past TOP_ZONE are managed by generic mm code.
- * These should be set to zero since that's what every other
- * architecture does.
- */
-static unsigned long max_zone_pfns[MAX_NR_ZONES] = {
-	[0            ... TOP_ZONE        ] = ~0UL,
-	[TOP_ZONE + 1 ... MAX_NR_ZONES - 1] = 0
-};
-
-/*
- * Restrict the specified zone and all more restrictive zones
- * to be below the specified pfn.  May not be called after
- * paging_init().
- */
-void __init limit_zone_pfn(enum zone_type zone, unsigned long pfn_limit)
-{
-	int i;
-
-	if (WARN_ON(zone_limits_final))
-		return;
-
-	for (i = zone; i >= 0; i--) {
-		if (max_zone_pfns[i] > pfn_limit)
-			max_zone_pfns[i] = pfn_limit;
-	}
-}
-
 /*
- * Find the least restrictive zone that is entirely below the
- * specified pfn limit.  Returns < 0 if no suitable zone is found.
+ * Zones usage:
  *
- * pfn_limit must be u64 because it can exceed 32 bits even on 32-bit
- * systems -- the DMA limit can be higher than any possible real pfn.
+ * We setup ZONE_DMA to be 31-bits on all platforms and ZONE_NORMAL to be
+ * everything else. GFP_DMA32 page allocations automatically fall back to
+ * ZONE_DMA.
+ *
+ * By using 31-bit unconditionally, we can exploit ARCH_ZONE_DMA_BITS to
+ * inform the generic DMA mapping code.  32-bit only devices (if not handled
+ * by an IOMMU anyway) will take a first dip into ZONE_NORMAL and get
+ * otherwise served by ZONE_DMA.
  */
-int dma_pfn_limit_to_zone(u64 pfn_limit)
-{
-	int i;
-
-	for (i = TOP_ZONE; i >= 0; i--) {
-		if (max_zone_pfns[i] <= pfn_limit)
-			return i;
-	}
-
-	return -EPERM;
-}
+static unsigned long max_zone_pfns[MAX_NR_ZONES];
 
 /*
  * paging_init() sets up the page tables - in fact we've already done this.
@@ -324,11 +254,14 @@ void __init paging_init(void)
 	printk(KERN_DEBUG "Memory hole size: %ldMB\n",
 	       (long int)((top_of_ram - total_ram) >> 20));
 
+#ifdef CONFIG_ZONE_DMA
+	max_zone_pfns[ZONE_DMA]	= min(max_low_pfn, 0x7fffffffUL >> PAGE_SHIFT);
+#endif
+	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 #ifdef CONFIG_HIGHMEM
-	limit_zone_pfn(ZONE_NORMAL, lowmem_end_addr >> PAGE_SHIFT);
+	max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
 #endif
-	limit_zone_pfn(TOP_ZONE, top_of_ram >> PAGE_SHIFT);
-	zone_limits_final = true;
+
 	free_area_init_nodes(max_zone_pfns);
 
 	mark_nonram_nosave();
@@ -503,7 +436,7 @@ EXPORT_SYMBOL(flush_icache_user_range);
 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
 		      pte_t *ptep)
 {
-#ifdef CONFIG_PPC_STD_MMU
+#ifdef CONFIG_PPC_BOOK3S
 	/*
 	 * We don't need to worry about _PAGE_PRESENT here because we are
 	 * called with either mm->page_table_lock held or ptl lock held
@@ -541,7 +474,7 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
 	}
 
 	hash_preload(vma->vm_mm, address, is_exec, trap);
-#endif /* CONFIG_PPC_STD_MMU */
+#endif /* CONFIG_PPC_BOOK3S */
 #if (defined(CONFIG_PPC_BOOK3E_64) || defined(CONFIG_PPC_FSL_BOOK3E)) \
 	&& defined(CONFIG_HUGETLB_PAGE)
 	if (is_vm_hugetlb_page(vma))
@@ -597,3 +530,9 @@ int devmem_is_allowed(unsigned long pfn)
 	return 0;
 }
 #endif /* CONFIG_STRICT_DEVMEM */
+
+/*
+ * This is defined in kernel/resource.c but only powerpc needs to export it, for
+ * the EHEA driver. Drop this when drivers/net/ethernet/ibm/ehea is removed.
+ */
+EXPORT_SYMBOL_GPL(walk_system_ram_range);