X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=arch%2Fpowerpc%2Fmm%2Fhash_utils_64.c;h=8d3b58ebd38e62d737f2f10aa773406d7c0c6473;hb=8a392625b665c676a77c62f8608d10ff430bcb83;hp=2b5a399f6fa644763866440916e73658d14e3ed9;hpb=f838bad1b3be8ca0c785ee0e0c570dfda74cf377;p=pandora-kernel.git

diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index 2b5a399f6fa6..8d3b58ebd38e 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -94,6 +94,9 @@ unsigned long htab_hash_mask;
 int mmu_linear_psize = MMU_PAGE_4K;
 int mmu_virtual_psize = MMU_PAGE_4K;
 int mmu_vmalloc_psize = MMU_PAGE_4K;
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+int mmu_vmemmap_psize = MMU_PAGE_4K;
+#endif
 int mmu_io_psize = MMU_PAGE_4K;
 int mmu_kernel_ssize = MMU_SEGSIZE_256M;
 int mmu_highuser_ssize = MMU_SEGSIZE_256M;
@@ -117,7 +120,7 @@ static DEFINE_SPINLOCK(linear_map_hash_lock);
 
 /* Pre-POWER4 CPUs (4k pages only)
  */
-struct mmu_psize_def mmu_psize_defaults_old[] = {
+static struct mmu_psize_def mmu_psize_defaults_old[] = {
 	[MMU_PAGE_4K] = {
 		.shift	= 12,
 		.sllp	= 0,
@@ -131,7 +134,7 @@ struct mmu_psize_def mmu_psize_defaults_old[] = {
  *
  * Support for 16Mb large pages
  */
-struct mmu_psize_def mmu_psize_defaults_gp[] = {
+static struct mmu_psize_def mmu_psize_defaults_gp[] = {
 	[MMU_PAGE_4K] = {
 		.shift	= 12,
 		.sllp	= 0,
@@ -387,11 +390,32 @@ static void __init htab_init_page_sizes(void)
 	}
 #endif /* CONFIG_PPC_64K_PAGES */
 
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+	/* We try to use 16M pages for vmemmap if that is supported
+	 * and we have at least 1G of RAM at boot
+	 */
+	if (mmu_psize_defs[MMU_PAGE_16M].shift &&
+	    lmb_phys_mem_size() >= 0x40000000)
+		mmu_vmemmap_psize = MMU_PAGE_16M;
+	else if (mmu_psize_defs[MMU_PAGE_64K].shift)
+		mmu_vmemmap_psize = MMU_PAGE_64K;
+	else
+		mmu_vmemmap_psize = MMU_PAGE_4K;
+#endif /* CONFIG_SPARSEMEM_VMEMMAP */
+
 	printk(KERN_DEBUG "Page orders: linear mapping = %d, "
-	       "virtual = %d, io = %d\n",
+	       "virtual = %d, io = %d"
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+	       ", vmemmap = %d"
+#endif
+	       "\n",
 	       mmu_psize_defs[mmu_linear_psize].shift,
 	       mmu_psize_defs[mmu_virtual_psize].shift,
-	       mmu_psize_defs[mmu_io_psize].shift);
+	       mmu_psize_defs[mmu_io_psize].shift
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+	       ,mmu_psize_defs[mmu_vmemmap_psize].shift
+#endif
+	       );
 
 #ifdef CONFIG_HUGETLB_PAGE
 	/* Init large page size. Currently, we pick 16M or 1M depending
@@ -509,8 +533,6 @@ void __init htab_initialize(void)
 	unsigned long base = 0, size = 0, limit;
 	int i;
 
-	extern unsigned long tce_alloc_start, tce_alloc_end;
-
 	DBG(" -> htab_initialize()\n");
 
 	/* Initialize segment sizes */
@@ -673,6 +695,28 @@ unsigned int hash_page_do_lazy_icache(unsigned int pp, pte_t pte, int trap)
 	return pp;
 }
 
+#ifdef CONFIG_PPC_MM_SLICES
+unsigned int get_paca_psize(unsigned long addr)
+{
+	unsigned long index, slices;
+
+	if (addr < SLICE_LOW_TOP) {
+		slices = get_paca()->context.low_slices_psize;
+		index = GET_LOW_SLICE_INDEX(addr);
+	} else {
+		slices = get_paca()->context.high_slices_psize;
+		index = GET_HIGH_SLICE_INDEX(addr);
+	}
+	return (slices >> (index * 4)) & 0xF;
+}
+
+#else
+unsigned int get_paca_psize(unsigned long addr)
+{
+	return get_paca()->context.user_psize;
+}
+#endif
+
 /*
  * Demote a segment to using 4k pages.
  * For now this makes the whole process use 4k pages.
@@ -680,13 +724,13 @@ unsigned int hash_page_do_lazy_icache(unsigned int pp, pte_t pte, int trap)
 #ifdef CONFIG_PPC_64K_PAGES
 void demote_segment_4k(struct mm_struct *mm, unsigned long addr)
 {
-	if (mm->context.user_psize == MMU_PAGE_4K)
+	if (get_slice_psize(mm, addr) == MMU_PAGE_4K)
 		return;
-	slice_set_user_psize(mm, MMU_PAGE_4K);
+	slice_set_range_psize(mm, addr, 1, MMU_PAGE_4K);
 #ifdef CONFIG_SPU_BASE
 	spu_flush_all_slbs(mm);
 #endif
-	if (get_paca()->context.user_psize != MMU_PAGE_4K) {
+	if (get_paca_psize(addr) != MMU_PAGE_4K) {
 		get_paca()->context = mm->context;
 		slb_flush_and_rebolt();
 	}
@@ -770,11 +814,7 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
 			DBG_LOW(" user region with no mm !\n");
 			return 1;
 		}
-#ifdef CONFIG_PPC_MM_SLICES
 		psize = get_slice_psize(mm, ea);
-#else
-		psize = mm->context.user_psize;
-#endif
 		ssize = user_segment_size(ea);
 		vsid = get_vsid(mm->context.id, ea, ssize);
 		break;
@@ -846,7 +886,7 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
 	/* Do actual hashing */
 #ifdef CONFIG_PPC_64K_PAGES
 	/* If _PAGE_4K_PFN is set, make sure this is a 4k segment */
-	if (pte_val(*ptep) & _PAGE_4K_PFN) {
+	if ((pte_val(*ptep) & _PAGE_4K_PFN) && psize == MMU_PAGE_64K) {
 		demote_segment_4k(mm, ea);
 		psize = MMU_PAGE_4K;
 	}
@@ -875,7 +915,7 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
 		}
 	}
 	if (user_region) {
-		if (psize != get_paca()->context.user_psize) {
+		if (psize != get_paca_psize(ea)) {
 			get_paca()->context = mm->context;
 			slb_flush_and_rebolt();
 		}