config SYS_SUPPORTS_HUGETLBFS
def_bool y
+# Support for additional huge page sizes besides HPAGE_SIZE.
+# The software support is currently only present in the TILE-Gx
+# hypervisor. TILEPro in any case does not support page sizes
+# larger than the default HPAGE_SIZE.
+config HUGETLB_SUPER_PAGES
+ depends on HUGETLB_PAGE && TILEGX
+ def_bool y
+
config GENERIC_CLOCKEVENTS
def_bool y
{
}
+#ifdef CONFIG_HUGETLB_SUPER_PAGES
+static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
+ struct page *page, int writable)
+{
+ size_t pagesize = huge_page_size(hstate_vma(vma));
+ if (pagesize != PUD_SIZE && pagesize != PMD_SIZE)
+ entry = pte_mksuper(entry);
+ return entry;
+}
+#define arch_make_huge_pte arch_make_huge_pte
+
+/* Sizes to scale up page size for PTEs with HV_PTE_SUPER bit. */
+enum {
+ HUGE_SHIFT_PGDIR = 0,
+ HUGE_SHIFT_PMD = 1,
+ HUGE_SHIFT_PAGE = 2,
+ HUGE_SHIFT_ENTRIES
+};
+extern int huge_shift[HUGE_SHIFT_ENTRIES];
+#endif
+
#endif /* _ASM_TILE_HUGETLB_H */
/*
* User L2 page tables are managed as one L2 page table per page,
* because we use the page allocator for them. This keeps the allocation
- * simple and makes it potentially useful to implement HIGHPTE at some point.
- * However, it's also inefficient, since L2 page tables are much smaller
+ * simple, but it's also inefficient, since L2 page tables are much smaller
* than pages (currently 2KB vs 64KB). So we should revisit this.
*/
typedef struct page *pgtable_t;
#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
-#define HUGE_MAX_HSTATE 2
+#define HUGE_MAX_HSTATE 6
#ifdef CONFIG_HUGETLB_PAGE
#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
#define _PAGE_PRESENT HV_PTE_PRESENT
#define _PAGE_HUGE_PAGE HV_PTE_PAGE
+#define _PAGE_SUPER_PAGE HV_PTE_SUPER
#define _PAGE_READABLE HV_PTE_READABLE
#define _PAGE_WRITABLE HV_PTE_WRITABLE
#define _PAGE_EXECUTABLE HV_PTE_EXECUTABLE
#define _PAGE_ALL (\
_PAGE_PRESENT | \
_PAGE_HUGE_PAGE | \
+ _PAGE_SUPER_PAGE | \
_PAGE_READABLE | \
_PAGE_WRITABLE | \
_PAGE_EXECUTABLE | \
#define pte_write hv_pte_get_writable
#define pte_exec hv_pte_get_executable
#define pte_huge hv_pte_get_page
+#define pte_super hv_pte_get_super
#define pte_rdprotect hv_pte_clear_readable
#define pte_exprotect hv_pte_clear_executable
#define pte_mkclean hv_pte_clear_dirty
#define pte_mkyoung hv_pte_set_accessed
#define pte_mkwrite hv_pte_set_writable
#define pte_mkhuge hv_pte_set_page
+#define pte_mksuper hv_pte_set_super
#define pte_special(pte) 0
#define pte_mkspecial(pte) (pte)
*/
#define pgd_offset_k(address) pgd_offset(&init_mm, address)
-#if defined(CONFIG_HIGHPTE)
-extern pte_t *pte_offset_map(pmd_t *, unsigned long address);
-#define pte_unmap(pte) kunmap_atomic(pte)
-#else
#define pte_offset_map(dir, address) pte_offset_kernel(dir, address)
#define pte_unmap(pte) do { } while (0)
-#endif
/* Clear a non-executable kernel PTE and flush it from the TLB. */
#define kpte_clear_flush(ptep, vaddr) \
/* Support /proc/NN/pgtable API. */
struct seq_file;
int arch_proc_pgtable_show(struct seq_file *m, struct mm_struct *mm,
- unsigned long vaddr, pte_t *ptep, void **datap);
+ unsigned long vaddr, unsigned long pagesize,
+ pte_t *ptep, void **datap);
#endif /* !__ASSEMBLY__ */
/* The hypervisor tells us what ASIDs are available to us. */
extern int min_asid, max_asid;
-static inline unsigned long hv_page_size(const struct vm_area_struct *vma)
-{
- return (vma->vm_flags & VM_HUGETLB) ? HPAGE_SIZE : PAGE_SIZE;
-}
-
/* Pass as vma pointer for non-executable mapping, if no vma available. */
-#define FLUSH_NONEXEC ((const struct vm_area_struct *)-1UL)
+#define FLUSH_NONEXEC ((struct vm_area_struct *)-1UL)
/* Flush a single user page on this cpu. */
-static inline void local_flush_tlb_page(const struct vm_area_struct *vma,
+static inline void local_flush_tlb_page(struct vm_area_struct *vma,
unsigned long addr,
unsigned long page_size)
{
}
/* Flush range of user pages on this cpu. */
-static inline void local_flush_tlb_pages(const struct vm_area_struct *vma,
+static inline void local_flush_tlb_pages(struct vm_area_struct *vma,
unsigned long addr,
unsigned long page_size,
unsigned long len)
extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
extern void flush_tlb_current_task(void);
extern void flush_tlb_mm(struct mm_struct *);
-extern void flush_tlb_page(const struct vm_area_struct *, unsigned long);
-extern void flush_tlb_page_mm(const struct vm_area_struct *,
+extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
+extern void flush_tlb_page_mm(struct vm_area_struct *,
struct mm_struct *, unsigned long);
-extern void flush_tlb_range(const struct vm_area_struct *,
+extern void flush_tlb_range(struct vm_area_struct *,
unsigned long start, unsigned long end);
#define flush_tlb() flush_tlb_current_task()
#define HV_DEFAULT_PAGE_SIZE_LARGE \
(__HV_SIZE_ONE << HV_LOG2_DEFAULT_PAGE_SIZE_LARGE)
+#if CHIP_VA_WIDTH() > 32
+
+/** The log2 of the initial size of jumbo pages, in bytes.
+ * See HV_DEFAULT_PAGE_SIZE_JUMBO.
+ */
+#define HV_LOG2_DEFAULT_PAGE_SIZE_JUMBO 32
+
+/** The initial size of jumbo pages, in bytes. This value should
+ * be verified at runtime by calling hv_sysconf(HV_SYSCONF_PAGE_SIZE_JUMBO).
+ * It may also be modified when installing a new context.
+ */
+#define HV_DEFAULT_PAGE_SIZE_JUMBO \
+ (__HV_SIZE_ONE << HV_LOG2_DEFAULT_PAGE_SIZE_JUMBO)
+
+#endif
+
/** The log2 of the granularity at which page tables must be aligned;
* in other words, the CPA for a page table must have this many zero
* bits at the bottom of the address.
#define HV_DISPATCH_GET_IPI_PTE 56
#endif
+/** hv_set_pte_super_shift */
+#define HV_DISPATCH_SET_PTE_SUPER_SHIFT 57
+
/** One more than the largest dispatch value */
-#define _HV_DISPATCH_END 57
+#define _HV_DISPATCH_END 58
#ifndef __ASSEMBLER__
*/
HV_SYSCONF_VALID_PAGE_SIZES = 7,
+ /** The size of jumbo pages, in bytes.
+ * If no jumbo pages are available, zero will be returned.
+ */
+ HV_SYSCONF_PAGE_SIZE_JUMBO = 8,
+
} HV_SysconfQuery;
/** Offset to subtract from returned Kelvin temperature to get degrees
#ifndef __ASSEMBLER__
+
+/** Set the number of pages ganged together by HV_PTE_SUPER at a
+ * particular level of the page table.
+ *
+ * The current TILE-Gx hardware only supports powers of four
+ * (i.e. log2_count must be a multiple of two), and the requested
+ * "super" page size must be less than the span of the next level in
+ * the page table. The largest size that can be requested is 64GB.
+ *
+ * The shift value is initially "0" for all page table levels,
+ * indicating that the HV_PTE_SUPER bit is effectively ignored.
+ *
+ * If you change the count from one non-zero value to another, the
+ * hypervisor will flush the entire TLB and TSB to avoid confusion.
+ *
+ * @param level Page table level (0, 1, or 2)
+ * @param log2_count Base-2 log of the number of pages to gang together,
+ * i.e. how much to shift left the base page size for the super page size.
+ * @return Zero on success, or a hypervisor error code on failure.
+ */
+int hv_set_pte_super_shift(int level, int log2_count);
+
+
/** Value returned from hv_inquire_context(). */
typedef struct
{
#define HV_PTE_INDEX_USER 10 /**< Page is user-accessible */
#define HV_PTE_INDEX_ACCESSED 11 /**< Page has been accessed */
#define HV_PTE_INDEX_DIRTY 12 /**< Page has been written */
- /* Bits 13-15 are reserved for
+ /* Bits 13-14 are reserved for
future use. */
+#define HV_PTE_INDEX_SUPER 15 /**< Pages ganged together for TLB */
#define HV_PTE_INDEX_MODE 16 /**< Page mode; see HV_PTE_MODE_xxx */
#define HV_PTE_MODE_BITS 3 /**< Number of bits in mode */
#define HV_PTE_INDEX_CLIENT2 19 /**< Page client state 2 */
/** Does this PTE map a page?
*
- * If this bit is set in the level-1 page table, the entry should be
+ * If this bit is set in a level-0 page table, the entry should be
+ * interpreted as a level-2 page table entry mapping a jumbo page.
+ *
+ * If this bit is set in a level-1 page table, the entry should be
* interpreted as a level-2 page table entry mapping a large page.
*
* This bit should not be modified by the client while PRESENT is set, as
*/
#define HV_PTE_PAGE (__HV_PTE_ONE << HV_PTE_INDEX_PAGE)
+/** Does this PTE implicitly reference multiple pages?
+ *
+ * If this bit is set in the page table (either in the level-2 page table,
+ * or in a higher level page table in conjunction with the PAGE bit)
+ * then the PTE specifies a range of contiguous pages, not a single page.
+ * The hv_set_pte_super_shift() allows you to specify the count for
+ * each level of the page table.
+ *
+ * Note: this bit is not supported on TILEPro systems.
+ */
+#define HV_PTE_SUPER (__HV_PTE_ONE << HV_PTE_INDEX_SUPER)
+
/** Is this a global (non-ASID) mapping?
*
* If this bit is set, the translations established by this PTE will
*/
_HV_BIT(present, PRESENT)
_HV_BIT(page, PAGE)
+_HV_BIT(super, SUPER)
_HV_BIT(client0, CLIENT0)
_HV_BIT(client1, CLIENT1)
_HV_BIT(client2, CLIENT2)
hv_inquire_realpa = TEXT_OFFSET + 0x106c0;
hv_flush_all = TEXT_OFFSET + 0x106e0;
hv_get_ipi_pte = TEXT_OFFSET + 0x10700;
-hv_glue_internals = TEXT_OFFSET + 0x10720;
+hv_set_pte_super_shift = TEXT_OFFSET + 0x10720;
+hv_glue_internals = TEXT_OFFSET + 0x10740;
#include <linux/proc_fs.h>
#include <linux/sysctl.h>
#include <linux/hardirq.h>
+#include <linux/hugetlb.h>
#include <linux/mman.h>
#include <asm/unaligned.h>
#include <asm/pgtable.h>
#include <linux/highmem.h>
#include <linux/smp.h>
#include <linux/timex.h>
+#include <linux/hugetlb.h>
#include <asm/setup.h>
#include <asm/sections.h>
#include <asm/cacheflush.h>
struct pglist_data node_data[MAX_NUMNODES] __read_mostly;
EXPORT_SYMBOL(node_data);
-/* We only create bootmem data on node 0. */
-static bootmem_data_t __initdata node0_bdata;
-
/* Information on the NUMA nodes that we compute early */
unsigned long __cpuinitdata node_start_pfn[MAX_NUMNODES];
unsigned long __cpuinitdata node_end_pfn[MAX_NUMNODES];
#endif
}
-static void __init setup_bootmem_allocator(void)
+/*
+ * On 32-bit machines, we only put bootmem on the low controller,
+ * since PAs > 4GB can't be used in bootmem. In principle one could
+ * imagine, e.g., multiple 1 GB controllers all of which could support
+ * bootmem, but in practice using controllers this small isn't a
+ * particularly interesting scenario, so we just keep it simple and
+ * use only the first controller for bootmem on 32-bit machines.
+ */
+static inline int node_has_bootmem(int nid)
+{
+#ifdef CONFIG_64BIT
+ return 1;
+#else
+ return nid == 0;
+#endif
+}
+
+static inline unsigned long alloc_bootmem_pfn(int nid,
+ unsigned long size,
+ unsigned long goal)
+{
+ void *kva = __alloc_bootmem_node(NODE_DATA(nid), size,
+ PAGE_SIZE, goal);
+ unsigned long pfn = kaddr_to_pfn(kva);
+ BUG_ON(goal && PFN_PHYS(pfn) != goal);
+ return pfn;
+}
+
+static void __init setup_bootmem_allocator_node(int i)
{
- unsigned long bootmap_size, first_alloc_pfn, last_alloc_pfn;
+ unsigned long start, end, mapsize, mapstart;
+
+ if (node_has_bootmem(i)) {
+ NODE_DATA(i)->bdata = &bootmem_node_data[i];
+ } else {
+ /* Share controller zero's bdata for now. */
+ NODE_DATA(i)->bdata = &bootmem_node_data[0];
+ return;
+ }
- /* Provide a node 0 bdata. */
- NODE_DATA(0)->bdata = &node0_bdata;
+ /* Skip up to after the bss in node 0. */
+ start = (i == 0) ? min_low_pfn : node_start_pfn[i];
-#ifdef CONFIG_PCI
- /* Don't let boot memory alias the PCI region. */
- last_alloc_pfn = min(max_low_pfn, pci_reserve_start_pfn);
+ /* Only lowmem, if we're a HIGHMEM build. */
+#ifdef CONFIG_HIGHMEM
+ end = node_lowmem_end_pfn[i];
#else
- last_alloc_pfn = max_low_pfn;
+ end = node_end_pfn[i];
#endif
- /*
- * Initialize the boot-time allocator (with low memory only):
- * The first argument says where to put the bitmap, and the
- * second says where the end of allocatable memory is.
- */
- bootmap_size = init_bootmem(min_low_pfn, last_alloc_pfn);
+ /* No memory here. */
+ if (end == start)
+ return;
+ /* Figure out where the bootmem bitmap is located. */
+ mapsize = bootmem_bootmap_pages(end - start);
+ if (i == 0) {
+ /* Use some space right before the heap on node 0. */
+ mapstart = start;
+ start += mapsize;
+ } else {
+ /* Allocate bitmap on node 0 to avoid page table issues. */
+ mapstart = alloc_bootmem_pfn(0, PFN_PHYS(mapsize), 0);
+ }
+
+ /* Initialize a node. */
+ init_bootmem_node(NODE_DATA(i), mapstart, start, end);
+
+ /* Free all the space back into the allocator. */
+ free_bootmem(PFN_PHYS(start), PFN_PHYS(end - start));
+
+#if defined(CONFIG_PCI)
/*
- * Let the bootmem allocator use all the space we've given it
- * except for its own bitmap.
+ * Throw away any memory aliased by the PCI region. FIXME: this
+ * is a temporary hack to work around bug 10502, and needs to be
+ * fixed properly.
*/
- first_alloc_pfn = min_low_pfn + PFN_UP(bootmap_size);
- if (first_alloc_pfn >= last_alloc_pfn)
- early_panic("Not enough memory on controller 0 for bootmem\n");
+ if (pci_reserve_start_pfn < end && pci_reserve_end_pfn > start)
+ reserve_bootmem(PFN_PHYS(pci_reserve_start_pfn),
+ PFN_PHYS(pci_reserve_end_pfn -
+ pci_reserve_start_pfn),
+ BOOTMEM_EXCLUSIVE);
+#endif
+}
- free_bootmem(PFN_PHYS(first_alloc_pfn),
- PFN_PHYS(last_alloc_pfn - first_alloc_pfn));
+static void __init setup_bootmem_allocator(void)
+{
+ int i;
+ for (i = 0; i < MAX_NUMNODES; ++i)
+ setup_bootmem_allocator_node(i);
#ifdef CONFIG_KEXEC
if (crashk_res.start != crashk_res.end)
return size;
}
-static inline unsigned long alloc_bootmem_pfn(int size, unsigned long goal)
-{
- void *kva = __alloc_bootmem(size, PAGE_SIZE, goal);
- unsigned long pfn = kaddr_to_pfn(kva);
- BUG_ON(goal && PFN_PHYS(pfn) != goal);
- return pfn;
-}
-
static void __init zone_sizes_init(void)
{
unsigned long zones_size[MAX_NR_ZONES] = { 0 };
* though, there'll be no lowmem, so we just alloc_bootmem
* the memmap. There will be no percpu memory either.
*/
- if (__pfn_to_highbits(start) == 0) {
- /* In low PAs, allocate via bootmem. */
+ if (i != 0 && cpu_isset(i, isolnodes)) {
+ node_memmap_pfn[i] =
+ alloc_bootmem_pfn(0, memmap_size, 0);
+ BUG_ON(node_percpu[i] != 0);
+ } else if (node_has_bootmem(start)) {
unsigned long goal = 0;
node_memmap_pfn[i] =
- alloc_bootmem_pfn(memmap_size, goal);
+ alloc_bootmem_pfn(i, memmap_size, 0);
if (kdata_huge)
goal = PFN_PHYS(lowmem_end) - node_percpu[i];
if (node_percpu[i])
node_percpu_pfn[i] =
- alloc_bootmem_pfn(node_percpu[i], goal);
- } else if (cpu_isset(i, isolnodes)) {
- node_memmap_pfn[i] = alloc_bootmem_pfn(memmap_size, 0);
- BUG_ON(node_percpu[i] != 0);
+ alloc_bootmem_pfn(i, node_percpu[i],
+ goal);
} else {
- /* In high PAs, just reserve some pages. */
+ /* In non-bootmem zones, just reserve some pages. */
node_memmap_pfn[i] = node_free_pfn[i];
node_free_pfn[i] += PFN_UP(memmap_size);
if (!kdata_huge) {
zones_size[ZONE_NORMAL] = end - start;
#endif
- /*
- * Everyone shares node 0's bootmem allocator, but
- * we use alloc_remap(), above, to put the actual
- * struct page array on the individual controllers,
- * which is most of the data that we actually care about.
- * We can't place bootmem allocators on the other
- * controllers since the bootmem allocator can only
- * operate on 32-bit physical addresses.
- */
- NODE_DATA(i)->bdata = NODE_DATA(0)->bdata;
+ /* Take zone metadata from controller 0 if we're isolnode. */
+ if (node_isset(i, isolnodes))
+ NODE_DATA(i)->bdata = &bootmem_node_data[0];
free_area_init_node(i, zones_size, start, NULL);
printk(KERN_DEBUG " Normal zone: %ld per-cpu pages\n",
/* Reset the network state on this cpu. */
reset_network_state();
#endif
+
+#ifdef CONFIG_HUGETLB_SUPER_PAGES
+ /* Initialize hugepage support on this cpu. */
+ if (!boot) {
+ int i;
+ for (i = 0; i < HUGE_SHIFT_ENTRIES; ++i)
+ hv_set_pte_super_shift(i, huge_shift[i]);
+ }
+#endif
}
#ifdef CONFIG_BLK_DEV_INITRD
#include <linux/cpumask.h>
#include <linux/module.h>
+#include <linux/hugetlb.h>
#include <asm/tlbflush.h>
#include <asm/homecache.h>
#include <hv/hypervisor.h>
flush_tlb_mm(current->mm);
}
-void flush_tlb_page_mm(const struct vm_area_struct *vma, struct mm_struct *mm,
+void flush_tlb_page_mm(struct vm_area_struct *vma, struct mm_struct *mm,
unsigned long va)
{
- unsigned long size = hv_page_size(vma);
+ unsigned long size = vma_kernel_pagesize(vma);
int cache = (vma->vm_flags & VM_EXEC) ? HV_FLUSH_EVICT_L1I : 0;
flush_remote(0, cache, mm_cpumask(mm),
va, size, size, mm_cpumask(mm), NULL, 0);
}
-void flush_tlb_page(const struct vm_area_struct *vma, unsigned long va)
+void flush_tlb_page(struct vm_area_struct *vma, unsigned long va)
{
flush_tlb_page_mm(vma, vma->vm_mm, va);
}
EXPORT_SYMBOL(flush_tlb_page);
-void flush_tlb_range(const struct vm_area_struct *vma,
+void flush_tlb_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
- unsigned long size = hv_page_size(vma);
+ unsigned long size = vma_kernel_pagesize(vma);
struct mm_struct *mm = vma->vm_mm;
int cache = (vma->vm_flags & VM_EXEC) ? HV_FLUSH_EVICT_L1I : 0;
flush_remote(0, cache, mm_cpumask(mm), start, end - start, size,
HV_Context ctx = hv_inquire_context();
unsigned long pgd_pfn = ctx.page_table >> PAGE_SHIFT;
struct page *pgd_page = pfn_to_page(pgd_pfn);
- BUG_ON(PageHighMem(pgd_page)); /* oops, HIGHPTE? */
+ BUG_ON(PageHighMem(pgd_page));
return (pgd_t *) __va(ctx.page_table);
}
#include <linux/cache.h>
#include <linux/smp.h>
#include <linux/module.h>
+#include <linux/hugetlb.h>
#include <asm/page.h>
#include <asm/sections.h>
#include <linux/mman.h>
#include <asm/tlb.h>
#include <asm/tlbflush.h>
+#include <asm/setup.h>
+
+#ifdef CONFIG_HUGETLB_SUPER_PAGES
+/* "Extra" page-size multipliers, one per level of the page table. */
+int huge_shift[HUGE_SHIFT_ENTRIES];
+
+/*
+ * This routine is a hybrid of pte_alloc_map() and pte_alloc_kernel().
+ * It assumes that L2 PTEs are never in HIGHMEM (we don't support that).
+ * It locks the user pagetable, and bumps up the mm->nr_ptes field,
+ * but otherwise allocate the page table using the kernel versions.
+ */
+static pte_t *pte_alloc_hugetlb(struct mm_struct *mm, pmd_t *pmd,
+ unsigned long address)
+{
+ pte_t *new;
+
+ if (pmd_none(*pmd)) {
+ new = pte_alloc_one_kernel(mm, address);
+ if (!new)
+ return NULL;
+
+ smp_wmb(); /* See comment in __pte_alloc */
+
+ spin_lock(&mm->page_table_lock);
+ if (likely(pmd_none(*pmd))) { /* Has another populated it ? */
+ mm->nr_ptes++;
+ pmd_populate_kernel(mm, pmd, new);
+ new = NULL;
+ } else
+ VM_BUG_ON(pmd_trans_splitting(*pmd));
+ spin_unlock(&mm->page_table_lock);
+ if (new)
+ pte_free_kernel(mm, new);
+ }
+
+ return pte_offset_kernel(pmd, address);
+}
+#endif
pte_t *huge_pte_alloc(struct mm_struct *mm,
unsigned long addr, unsigned long sz)
{
pgd_t *pgd;
pud_t *pud;
- pte_t *pte = NULL;
- /* We do not yet support multiple huge page sizes. */
- BUG_ON(sz != PMD_SIZE);
+ addr &= -sz; /* Mask off any low bits in the address. */
pgd = pgd_offset(mm, addr);
pud = pud_alloc(mm, pgd, addr);
- if (pud)
- pte = (pte_t *) pmd_alloc(mm, pud, addr);
- BUG_ON(pte && !pte_none(*pte) && !pte_huge(*pte));
- return pte;
+#ifdef CONFIG_HUGETLB_SUPER_PAGES
+ if (sz >= PGDIR_SIZE) {
+ BUG_ON(sz != PGDIR_SIZE &&
+ sz != PGDIR_SIZE << huge_shift[HUGE_SHIFT_PGDIR]);
+ return (pte_t *)pud;
+ } else {
+ pmd_t *pmd = pmd_alloc(mm, pud, addr);
+ if (sz >= PMD_SIZE) {
+ BUG_ON(sz != PMD_SIZE &&
+ sz != (PMD_SIZE << huge_shift[HUGE_SHIFT_PMD]));
+ return (pte_t *)pmd;
+ }
+ else {
+ if (sz != PAGE_SIZE << huge_shift[HUGE_SHIFT_PAGE])
+ panic("Unexpected page size %#lx\n", sz);
+ return pte_alloc_hugetlb(mm, pmd, addr);
+ }
+ }
+#else
+ BUG_ON(sz != PMD_SIZE);
+ return (pte_t *) pmd_alloc(mm, pud, addr);
+#endif
}
-pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
+static pte_t *get_pte(pte_t *base, int index, int level)
{
- pgd_t *pgd;
- pud_t *pud;
- pmd_t *pmd = NULL;
-
- pgd = pgd_offset(mm, addr);
- if (pgd_present(*pgd)) {
- pud = pud_offset(pgd, addr);
- if (pud_present(*pud))
- pmd = pmd_offset(pud, addr);
+ pte_t *ptep = base + index;
+#ifdef CONFIG_HUGETLB_SUPER_PAGES
+ if (!pte_present(*ptep) && huge_shift[level] != 0) {
+ unsigned long mask = -1UL << huge_shift[level];
+ pte_t *super_ptep = base + (index & mask);
+ pte_t pte = *super_ptep;
+ if (pte_present(pte) && pte_super(pte))
+ ptep = super_ptep;
}
- return (pte_t *) pmd;
+#endif
+ return ptep;
}
-#ifdef HUGETLB_TEST
-struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
- int write)
+pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
{
- unsigned long start = address;
- int length = 1;
- int nr;
- struct page *page;
- struct vm_area_struct *vma;
-
- vma = find_vma(mm, addr);
- if (!vma || !is_vm_hugetlb_page(vma))
- return ERR_PTR(-EINVAL);
-
- pte = huge_pte_offset(mm, address);
-
- /* hugetlb should be locked, and hence, prefaulted */
- WARN_ON(!pte || pte_none(*pte));
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+#ifdef CONFIG_HUGETLB_SUPER_PAGES
+ pte_t *pte;
+#endif
- page = &pte_page(*pte)[vpfn % (HPAGE_SIZE/PAGE_SIZE)];
+ /* Get the top-level page table entry. */
+ pgd = (pgd_t *)get_pte((pte_t *)mm->pgd, pgd_index(addr), 0);
+ if (!pgd_present(*pgd))
+ return NULL;
- WARN_ON(!PageHead(page));
+ /* We don't have four levels. */
+ pud = pud_offset(pgd, addr);
+#ifndef __PAGETABLE_PUD_FOLDED
+# error support fourth page table level
+#endif
- return page;
-}
+ /* Check for an L0 huge PTE, if we have three levels. */
+#ifndef __PAGETABLE_PMD_FOLDED
+ if (pud_huge(*pud))
+ return (pte_t *)pud;
-int pmd_huge(pmd_t pmd)
-{
- return 0;
-}
+ pmd = (pmd_t *)get_pte((pte_t *)pud_page_vaddr(*pud),
+ pmd_index(addr), 1);
+ if (!pmd_present(*pmd))
+ return NULL;
+#else
+ pmd = pmd_offset(pud, addr);
+#endif
-int pud_huge(pud_t pud)
-{
- return 0;
-}
+ /* Check for an L1 huge PTE. */
+ if (pmd_huge(*pmd))
+ return (pte_t *)pmd;
+
+#ifdef CONFIG_HUGETLB_SUPER_PAGES
+ /* Check for an L2 huge PTE. */
+ pte = get_pte((pte_t *)pmd_page_vaddr(*pmd), pte_index(addr), 2);
+ if (!pte_present(*pte))
+ return NULL;
+ if (pte_super(*pte))
+ return pte;
+#endif
-struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
- pmd_t *pmd, int write)
-{
return NULL;
}
-#else
-
struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
int write)
{
return 0;
}
-#endif
-
#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file,
unsigned long addr, unsigned long len,
pgoff, flags);
}
-static __init int setup_hugepagesz(char *opt)
+#ifdef CONFIG_HUGETLB_SUPER_PAGES
+static void add_super_size(unsigned long ps, int level, int base_shift)
{
- unsigned long ps = memparse(opt, &opt);
- if (ps == PMD_SIZE) {
- hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT);
- } else if (ps == PUD_SIZE) {
- hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
+ int log_ps = __builtin_ctzl(ps);
+ if ((1UL << log_ps) != ps || (log_ps & 1) != 0) {
+ pr_warn("Not enabling %ld byte huge pages;"
+ " must be a power of four.\n", ps);
+ return;
+ }
+ if (log_ps != base_shift) {
+ if (huge_shift[level] != 0) {
+ int old_shift = base_shift + huge_shift[level];
+ pr_warn("Not enabling %ld MB huge pages;"
+ " already have size %ld MB.\n",
+ ps >> 20, (1UL << old_shift) >> 20);
+ return;
+ }
+ if (hv_set_pte_super_shift(level, log_ps - base_shift) != 0) {
+ pr_warn("Not enabling %ld MB huge pages;"
+ " no hypervisor support.\n", ps >> 20);
+ return;
+ }
+ printk(KERN_DEBUG "Enabled %ld MB huge pages\n", ps >> 20);
+ huge_shift[level] = log_ps - base_shift;
+ }
+ hugetlb_add_hstate(log_ps - PAGE_SHIFT);
+}
+
+static __init int __setup_hugepagesz(unsigned long ps)
+{
+ if (ps > 64*1024*1024*1024UL) {
+ pr_warn("Not enabling %ld MB huge pages;"
+ " largest legal value is 64 GB .\n", ps >> 20);
+ }
+ else if (ps >= PUD_SIZE) {
+ static long hv_jpage_size;
+ if (hv_jpage_size == 0)
+ hv_jpage_size = hv_sysconf(HV_SYSCONF_PAGE_SIZE_JUMBO);
+ if (hv_jpage_size != PUD_SIZE) {
+ pr_warn("Not enabling >= %ld MB huge pages:"
+ " hypervisor reports size %ld\n",
+ PUD_SIZE >> 20, hv_jpage_size);
+ }
+ add_super_size(ps, 0, PUD_SHIFT);
+ } else if (ps >= PMD_SIZE) {
+ add_super_size(ps, 1, PMD_SHIFT);
+ } else if (ps > PAGE_SIZE) {
+ add_super_size(ps, 2, PAGE_SHIFT);
} else {
- pr_err("hugepagesz: Unsupported page size %lu M\n",
- ps >> 20);
- return 0;
+ pr_err("hugepagesz: Unsupported page size %ld\n", ps);
}
return 1;
}
+
+bool saw_hugepagesz;
+
+static __init int setup_hugepagesz(char *opt)
+{
+ saw_hugepagesz = true;
+ return __setup_hugepagesz(memparse(opt, NULL));
+}
__setup("hugepagesz=", setup_hugepagesz);
+/* Provide 1MB size as a standard default if nothing specified. */
+static __init int add_default_hugepagesz(void)
+{
+ if (!saw_hugepagesz)
+ __setup_hugepagesz(1 * 1024 * 1024UL);
+ return 1;
+}
+arch_initcall(add_default_hugepagesz);
+#endif
+
#endif /*HAVE_ARCH_HUGETLB_UNMAPPED_AREA*/
#endif /* CONFIG_HIGHMEM */
+#ifndef CONFIG_64BIT
static void __init init_free_pfn_range(unsigned long start, unsigned long end)
{
unsigned long pfn;
init_free_pfn_range(start, end);
}
}
+#endif
/*
* paging_init() sets up the page tables - note that all of lowmem is
/* this will put all bootmem onto the freelists */
totalram_pages += free_all_bootmem();
+#ifndef CONFIG_64BIT
/* count all remaining LOWMEM and give all HIGHMEM to page allocator */
set_non_bootmem_pages_init();
+#endif
codesize = (unsigned long)&_etext - (unsigned long)&_text;
datasize = (unsigned long)&_end - (unsigned long)&_sdata;
set_pte_pfn(address, phys >> PAGE_SHIFT, flags);
}
-#if defined(CONFIG_HIGHPTE)
-pte_t *_pte_offset_map(pmd_t *dir, unsigned long address)
-{
- pte_t *pte = kmap_atomic(pmd_page(*dir)) +
- (pmd_ptfn(*dir) << HV_LOG2_PAGE_TABLE_ALIGN) & ~PAGE_MASK;
- return &pte[pte_index(address)];
-}
-#endif
-
/**
* shatter_huge_page() - ensure a given address is mapped by a small page.
*
struct page *p;
int i;
-#ifdef CONFIG_HIGHPTE
- flags |= __GFP_HIGHMEM;
-#endif
-
p = alloc_pages(flags, L2_USER_PGTABLE_ORDER);
if (p == NULL)
return NULL;
projects / karo-tx-linux.git / commitdiff