[PATCH] ppc64: Fix bug in SLB miss handler for hugepages

This patch, however, should be applied on top of the 64k-page-size patch to
fix some problems with hugepage (some pre-existing, another introduced by
this patch).

The patch fixes a bug in the SLB miss handler for hugepages on ppc64
introduced by the dynamic hugepage patch (commit id
c594adad5653491813959277fb87a2fef54c4e05) due to a misunderstanding of the
srd instruction's behaviour (mea culpa).  The problem arises when a 64-bit
process maps some hugepages in the low 4GB of the address space (unusual).
In this case, as well as the 256M segment in question being marked for
hugepages, other segments at 32G intervals will be incorrectly marked for
hugepages.

In the process, this patch tweaks the semantics of the hugepage bitmaps to
be more sensible.  Previously, an address below 4G was marked for hugepages
if the appropriate segment bit in the "low areas" bitmask was set *or* if
the low bit in the "high areas" bitmap was set (which would mark all
addresses below 1TB for hugepage).  With this patch, any given address is
governed by a single bitmap.  Addresses below 4GB are marked for hugepage
if and only if their bit is set in the "low areas" bitmap (256M
granularity).  Addresses between 4GB and 1TB are marked for hugepage iff
the low bit in the "high areas" bitmap is set.  Higher addresses are marked
for hugepage iff their bit in the "high areas" bitmap is set (1TB
granularity).

To avoid conflicts, this patch must be applied on top of BenH's pending
patch for 64k base page size [0].  As such, this patch also addresses a
hugepage problem introduced by that patch.  That patch allows hugepages of
1MB in size on hardware which supports it, however, that won't work when
using 4k pages (4 level pagetable), because in that case hugepage PTEs are
stored at the PMD level, and each PMD entry maps 2MB.  This patch simply
disallows hugepages in that case (we can do something cleverer to re-enable
them some other day).

Built, booted, and a handful of hugepage related tests passed on POWER5
LPAR (both ARCH=powerpc and ARCH=ppc64).

[0] http://gate.crashing.org/~benh/ppc64-64k-pages.diff

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index b2f3dbca695223fc988c1be9cc778243481eb221..f15dfb92dec052d51f6c9212a8323ea2cf517945 100644 (file)
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -329,12 +329,14 @@ static void __init htab_init_page_sizes(void)
         */
        if (mmu_psize_defs[MMU_PAGE_16M].shift)
                mmu_huge_psize = MMU_PAGE_16M;
+       /* With 4k/4level pagetables, we can't (for now) cope with a
+        * huge page size < PMD_SIZE */
        else if (mmu_psize_defs[MMU_PAGE_1M].shift)
                mmu_huge_psize = MMU_PAGE_1M;
 
        /* Calculate HPAGE_SHIFT and sanity check it */
-       if (mmu_psize_defs[mmu_huge_psize].shift > 16 &&
-           mmu_psize_defs[mmu_huge_psize].shift < 28)
+       if (mmu_psize_defs[mmu_huge_psize].shift > MIN_HUGEPTE_SHIFT &&
+           mmu_psize_defs[mmu_huge_psize].shift < SID_SHIFT)
                HPAGE_SHIFT = mmu_psize_defs[mmu_huge_psize].shift;
        else
                HPAGE_SHIFT = 0; /* No huge pages dude ! */

diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index 0073a04047e48b6a7b8144ee1538142925d7bdb3..426c269e552eec77bbee18cb086f900716cffb4a 100644 (file)
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -212,6 +212,12 @@ static int prepare_high_area_for_htlb(struct mm_struct *mm, unsigned long area)
 
        BUG_ON(area >= NUM_HIGH_AREAS);
 
+       /* Hack, so that each addresses is controlled by exactly one
+        * of the high or low area bitmaps, the first high area starts
+        * at 4GB, not 0 */
+       if (start == 0)
+               start = 0x100000000UL;
+
        /* Check no VMAs are in the region */
        vma = find_vma(mm, start);
        if (vma && (vma->vm_start < end))

diff --git a/arch/powerpc/mm/slb_low.S b/arch/powerpc/mm/slb_low.S
index 3e18241b6f35218b65619762f63fc1867052aa83..950ffc5848c7950e1d449615aa61fb5782dde2cc 100644 (file)
--- a/arch/powerpc/mm/slb_low.S
+++ b/arch/powerpc/mm/slb_low.S
@@ -80,12 +80,17 @@ _GLOBAL(slb_miss_kernel_load_virtual)
 BEGIN_FTR_SECTION
        b       1f
 END_FTR_SECTION_IFCLR(CPU_FTR_16M_PAGE)
+       cmpldi  r10,16
+
+       lhz     r9,PACALOWHTLBAREAS(r13)
+       mr      r11,r10
+       blt     5f
+
        lhz     r9,PACAHIGHHTLBAREAS(r13)
        srdi    r11,r10,(HTLB_AREA_SHIFT-SID_SHIFT)
-       srd     r9,r9,r11
-       lhz     r11,PACALOWHTLBAREAS(r13)
-       srd     r11,r11,r10
-       or.     r9,r9,r11
+
+5:     srd     r9,r9,r11
+       andi.   r9,r9,1
        beq     1f
 _GLOBAL(slb_miss_user_load_huge)
        li      r11,0

diff --git a/include/asm-ppc64/pgtable-4k.h b/include/asm-ppc64/pgtable-4k.h
index c883a274855878c20602cf246d45993f218ebffe..e9590c06ad9276541a191ec1f3a3057452c7bde9 100644 (file)
--- a/include/asm-ppc64/pgtable-4k.h
+++ b/include/asm-ppc64/pgtable-4k.h
@@ -23,6 +23,9 @@
 #define PMD_SIZE       (1UL << PMD_SHIFT)
 #define PMD_MASK       (~(PMD_SIZE-1))
 
+/* With 4k base page size, hugepage PTEs go at the PMD level */
+#define MIN_HUGEPTE_SHIFT      PMD_SHIFT
+
 /* PUD_SHIFT determines what a third-level page table entry can map */
 #define PUD_SHIFT      (PMD_SHIFT + PMD_INDEX_SIZE)
 #define PUD_SIZE       (1UL << PUD_SHIFT)

diff --git a/include/asm-ppc64/pgtable-64k.h b/include/asm-ppc64/pgtable-64k.h
index c5f437c86b3c7a67b264edea5b9de83dedf9001c..154f1840ece4d0c49e403177b8262640e91048a6 100644 (file)
--- a/include/asm-ppc64/pgtable-64k.h
+++ b/include/asm-ppc64/pgtable-64k.h
@@ -14,6 +14,9 @@
 #define PTRS_PER_PMD   (1 << PMD_INDEX_SIZE)
 #define PTRS_PER_PGD   (1 << PGD_INDEX_SIZE)
 
+/* With 4k base page size, hugepage PTEs go at the PMD level */
+#define MIN_HUGEPTE_SHIFT      PAGE_SHIFT
+
 /* PMD_SHIFT determines what a second-level page table entry can map */
 #define PMD_SHIFT      (PAGE_SHIFT + PTE_INDEX_SIZE)
 #define PMD_SIZE       (1UL << PMD_SHIFT)