The patch titled
powerpc: scan device tree for gigantic pages
has been added to the -mm tree. Its filename is
powerpc-scan-device-tree-for-gigantic-pages.patch
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------------------------------------------------------
Subject: powerpc: scan device tree for gigantic pages
From: Nick Piggin <npiggin@xxxxxxx>
The 16G huge pages have to be reserved in the HMC prior to boot. The
location of the pages are placed in the device tree. This patch adds code
to scan the device tree during very early boot and save these page
locations until hugetlbfs is ready for them.
Acked-by: Adam Litke <agl@xxxxxxxxxx>
Signed-off-by: Jon Tollefson <kniht@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Nick Piggin <npiggin@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/mm/hash_utils_64.c | 44 ++++++++++++++++++++++++++++-
arch/powerpc/mm/hugetlbpage.c | 16 ++++++++++
include/asm-powerpc/mmu-hash64.h | 2 +
3 files changed, 61 insertions(+), 1 deletion(-)
diff -puN arch/powerpc/mm/hash_utils_64.c~powerpc-scan-device-tree-for-gigantic-pages arch/powerpc/mm/hash_utils_64.c
--- a/arch/powerpc/mm/hash_utils_64.c~powerpc-scan-device-tree-for-gigantic-pages
+++ a/arch/powerpc/mm/hash_utils_64.c
@@ -68,6 +68,7 @@
#define KB (1024)
#define MB (1024*KB)
+#define GB (1024L*MB)
/*
* Note: pte --> Linux PTE
@@ -329,6 +330,44 @@ static int __init htab_dt_scan_page_size
return 0;
}
+/* Scan for 16G memory blocks that have been set aside for huge pages
+ * and reserve those blocks for 16G huge pages.
+ */
+static int __init htab_dt_scan_hugepage_blocks(unsigned long node,
+ const char *uname, int depth,
+ void *data) {
+ char *type = of_get_flat_dt_prop(node, "device_type", NULL);
+ unsigned long *addr_prop;
+ u32 *page_count_prop;
+ unsigned int expected_pages;
+ long unsigned int phys_addr;
+ long unsigned int block_size;
+
+ /* We are scanning "memory" nodes only */
+ if (type == NULL || strcmp(type, "memory") != 0)
+ return 0;
+
+ /* This property is the log base 2 of the number of virtual pages that
+ * will represent this memory block. */
+ page_count_prop = of_get_flat_dt_prop(node, "ibm,expected#pages", NULL);
+ if (page_count_prop == NULL)
+ return 0;
+ expected_pages = (1 << page_count_prop[0]);
+ addr_prop = of_get_flat_dt_prop(node, "reg", NULL);
+ if (addr_prop == NULL)
+ return 0;
+ phys_addr = addr_prop[0];
+ block_size = addr_prop[1];
+ if (block_size != (16 * GB))
+ return 0;
+ printk(KERN_INFO "Huge page(16GB) memory: "
+ "addr = 0x%lX size = 0x%lX pages = %d\n",
+ phys_addr, block_size, expected_pages);
+ lmb_reserve(phys_addr, block_size * expected_pages);
+ add_gpage(phys_addr, block_size, expected_pages);
+ return 0;
+}
+
static void __init htab_init_page_sizes(void)
{
int rc;
@@ -418,7 +457,10 @@ static void __init htab_init_page_sizes(
);
#ifdef CONFIG_HUGETLB_PAGE
- /* Init large page size. Currently, we pick 16M or 1M depending
+ /* Reserve 16G huge page memory sections for huge pages */
+ of_scan_flat_dt(htab_dt_scan_hugepage_blocks, NULL);
+
+/* Init large page size. Currently, we pick 16M or 1M depending
* on what is available
*/
if (mmu_psize_defs[MMU_PAGE_16M].shift)
diff -puN arch/powerpc/mm/hugetlbpage.c~powerpc-scan-device-tree-for-gigantic-pages arch/powerpc/mm/hugetlbpage.c
--- a/arch/powerpc/mm/hugetlbpage.c~powerpc-scan-device-tree-for-gigantic-pages
+++ a/arch/powerpc/mm/hugetlbpage.c
@@ -110,6 +110,22 @@ pmd_t *hpmd_alloc(struct mm_struct *mm,
}
#endif
+/* Build list of addresses of gigantic pages. This function is used in early
+ * boot before the buddy or bootmem allocator is setup.
+ */
+void add_gpage(unsigned long addr, unsigned long page_size,
+ unsigned long number_of_pages)
+{
+ if (!addr)
+ return;
+ while (number_of_pages > 0) {
+ gpage_freearray[nr_gpages] = addr;
+ nr_gpages++;
+ number_of_pages--;
+ addr += page_size;
+ }
+}
+
/* Moves the gigantic page addresses from the temporary list to the
* huge_boot_pages list. */
int alloc_bootmem_huge_page(struct hstate *h)
diff -puN include/asm-powerpc/mmu-hash64.h~powerpc-scan-device-tree-for-gigantic-pages include/asm-powerpc/mmu-hash64.h
--- a/include/asm-powerpc/mmu-hash64.h~powerpc-scan-device-tree-for-gigantic-pages
+++ a/include/asm-powerpc/mmu-hash64.h
@@ -281,6 +281,8 @@ extern int htab_bolt_mapping(unsigned lo
unsigned long pstart, unsigned long mode,
int psize, int ssize);
extern void set_huge_psize(int psize);
+extern void add_gpage(unsigned long addr, unsigned long page_size,
+ unsigned long number_of_pages);
extern void demote_segment_4k(struct mm_struct *mm, unsigned long addr);
extern void htab_initialize(void);
_
Patches currently in -mm which might be from npiggin@xxxxxxx are
hugetlb-fix-lockdep-error.patch
vt-fix-vc_resize-locking.patch
linux-next.patch
spufs-convert-nopfn-to-fault.patch
mspec-convert-nopfn-to-fault.patch
mspec-convert-nopfn-to-fault-fix.patch
mm-remove-nopfn.patch
mm-remove-double-indirection-on-tlb-parameter-to-free_pgd_range-co.patch
hugetlb-guarantee-that-cow-faults-for-a-process-that-called-mmapmap_private-on-hugetlbfs-will-succeed-build-fix.patch
hugetlb-factor-out-prep_new_huge_page.patch
hugetlb-modular-state-for-hugetlb-page-size.patch
hugetlb-modular-state-for-hugetlb-page-size-checkpatch-fixes.patch
hugetlb-multiple-hstates-for-multiple-page-sizes.patch
hugetlb-multiple-hstates-for-multiple-page-sizes-checkpatch-fixes.patch
hugetlbfs-per-mount-huge-page-sizes.patch
hugetlb-new-sysfs-interface.patch
hugetlb-abstract-numa-round-robin-selection.patch
mm-introduce-non-panic-alloc_bootmem.patch
mm-export-prep_compound_page-to-mm.patch
hugetlb-support-larger-than-max_order.patch
hugetlb-support-boot-allocate-different-sizes.patch
hugetlb-printk-cleanup.patch
hugetlb-introduce-pud_huge.patch
x86-support-gb-hugepages-on-64-bit.patch
x86-add-hugepagesz-option-on-64-bit.patch
hugetlb-override-default-huge-page-size.patch
hugetlb-allow-arch-overried-hugepage-allocation.patch
powerpc-function-to-allocate-gigantic-hugepages.patch
powerpc-scan-device-tree-for-gigantic-pages.patch
powerpc-define-support-for-16g-hugepages.patch
fs-check-for-statfs-overflow.patch
powerpc-support-multiple-hugepage-sizes.patch
x86-implement-pte_special.patch
mm-introduce-get_user_pages_fast.patch
mm-introduce-get_user_pages_fast-checkpatch-fixes.patch
x86-lockless-get_user_pages_fast.patch
x86-lockless-get_user_pages_fast-checkpatch-fixes.patch
x86-lockless-get_user_pages_fast-fix.patch
x86-lockless-get_user_pages_fast-fix-warning.patch
dio-use-get_user_pages_fast.patch
splice-use-get_user_pages_fast.patch
mm-readahead-scan-lockless.patch
radix-tree-add-gang_lookup_slot-gang_lookup_slot_tag.patch
mm-speculative-page-references.patch
mm-lockless-pagecache.patch
mm-spinlock-tree_lock.patch
powerpc-implement-pte_special.patch
powerpc-lockless-get_user_pages_fast.patch
vmscan-move-isolate_lru_page-to-vmscanc.patch
vmscan-mlocked-pages-are-non-reclaimable.patch
vmscan-handle-mlocked-pages-during-map-remap-unmap.patch
vmscan-mlocked-pages-statistics.patch
reiser4.patch
likeliness-accounting-change-and-cleanup.patch
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