#include <linux/mm.h>
#include <linux/hugetlb.h>
#include <linux/pagemap.h>
-#include <linux/smp_lock.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/sysctl.h>
#include <asm/machdep.h>
#include <asm/cputable.h>
#include <asm/tlb.h>
+#include <asm/spu.h>
#include <linux/sysctl.h>
#define NUM_LOW_AREAS (0x100000000UL >> SID_SHIFT)
#define NUM_HIGH_AREAS (PGTABLE_RANGE >> HTLB_AREA_SHIFT)
+#ifdef CONFIG_PPC_64K_PAGES
+#define HUGEPTE_INDEX_SIZE (PMD_SHIFT-HPAGE_SHIFT)
+#else
+#define HUGEPTE_INDEX_SIZE (PUD_SHIFT-HPAGE_SHIFT)
+#endif
+#define PTRS_PER_HUGEPTE (1 << HUGEPTE_INDEX_SIZE)
+#define HUGEPTE_TABLE_SIZE (sizeof(pte_t) << HUGEPTE_INDEX_SIZE)
+
+#define HUGEPD_SHIFT (HPAGE_SHIFT + HUGEPTE_INDEX_SIZE)
+#define HUGEPD_SIZE (1UL << HUGEPD_SHIFT)
+#define HUGEPD_MASK (~(HUGEPD_SIZE-1))
+
+#define huge_pgtable_cache (pgtable_cache[HUGEPTE_CACHE_NUM])
+
+/* Flag to mark huge PD pointers. This means pmd_bad() and pud_bad()
+ * will choke on pointers to hugepte tables, which is handy for
+ * catching screwups early. */
+#define HUGEPD_OK 0x1
+
+typedef struct { unsigned long pd; } hugepd_t;
+
+#define hugepd_none(hpd) ((hpd).pd == 0)
+
+static inline pte_t *hugepd_page(hugepd_t hpd)
+{
+ BUG_ON(!(hpd.pd & HUGEPD_OK));
+ return (pte_t *)(hpd.pd & ~HUGEPD_OK);
+}
+
+static inline pte_t *hugepte_offset(hugepd_t *hpdp, unsigned long addr)
+{
+ unsigned long idx = ((addr >> HPAGE_SHIFT) & (PTRS_PER_HUGEPTE-1));
+ pte_t *dir = hugepd_page(*hpdp);
+
+ return dir + idx;
+}
+
+static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp,
+ unsigned long address)
+{
+ pte_t *new = kmem_cache_alloc(huge_pgtable_cache,
+ GFP_KERNEL|__GFP_REPEAT);
+
+ if (! new)
+ return -ENOMEM;
+
+ spin_lock(&mm->page_table_lock);
+ if (!hugepd_none(*hpdp))
+ kmem_cache_free(huge_pgtable_cache, new);
+ else
+ hpdp->pd = (unsigned long)new | HUGEPD_OK;
+ spin_unlock(&mm->page_table_lock);
+ return 0;
+}
+
/* Modelled after find_linux_pte() */
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
{
pgd_t *pg;
pud_t *pu;
- pmd_t *pm;
- pte_t *pt;
- BUG_ON(! in_hugepage_area(mm->context, addr));
+ BUG_ON(get_slice_psize(mm, addr) != mmu_huge_psize);
addr &= HPAGE_MASK;
if (!pgd_none(*pg)) {
pu = pud_offset(pg, addr);
if (!pud_none(*pu)) {
- pm = pmd_offset(pu, addr);
#ifdef CONFIG_PPC_64K_PAGES
- /* Currently, we use the normal PTE offset within full
- * size PTE pages, thus our huge PTEs are scattered in
- * the PTE page and we do waste some. We may change
- * that in the future, but the current mecanism keeps
- * things much simpler
- */
- if (!pmd_none(*pm)) {
- /* Note: pte_offset_* are all equivalent on
- * ppc64 as we don't have HIGHMEM
- */
- pt = pte_offset_kernel(pm, addr);
- return pt;
- }
-#else /* CONFIG_PPC_64K_PAGES */
- /* On 4k pages, we put huge PTEs in the PMD page */
- pt = (pte_t *)pm;
- return pt;
-#endif /* CONFIG_PPC_64K_PAGES */
+ pmd_t *pm;
+ pm = pmd_offset(pu, addr);
+ if (!pmd_none(*pm))
+ return hugepte_offset((hugepd_t *)pm, addr);
+#else
+ return hugepte_offset((hugepd_t *)pu, addr);
+#endif
}
}
{
pgd_t *pg;
pud_t *pu;
- pmd_t *pm;
- pte_t *pt;
+ hugepd_t *hpdp = NULL;
- BUG_ON(! in_hugepage_area(mm->context, addr));
+ BUG_ON(get_slice_psize(mm, addr) != mmu_huge_psize);
addr &= HPAGE_MASK;
pu = pud_alloc(mm, pg, addr);
if (pu) {
- pm = pmd_alloc(mm, pu, addr);
- if (pm) {
#ifdef CONFIG_PPC_64K_PAGES
- /* See comment in huge_pte_offset. Note that if we ever
- * want to put the page size in the PMD, we would have
- * to open code our own pte_alloc* function in order
- * to populate and set the size atomically
- */
- pt = pte_alloc_map(mm, pm, addr);
-#else /* CONFIG_PPC_64K_PAGES */
- pt = (pte_t *)pm;
-#endif /* CONFIG_PPC_64K_PAGES */
- return pt;
- }
+ pmd_t *pm;
+ pm = pmd_alloc(mm, pu, addr);
+ if (pm)
+ hpdp = (hugepd_t *)pm;
+#else
+ hpdp = (hugepd_t *)pu;
+#endif
}
- return NULL;
-}
+ if (! hpdp)
+ return NULL;
-void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
- pte_t *ptep, pte_t pte)
-{
- if (pte_present(*ptep)) {
- /* We open-code pte_clear because we need to pass the right
- * argument to hpte_update (huge / !huge)
- */
- unsigned long old = pte_update(ptep, ~0UL);
- if (old & _PAGE_HASHPTE)
- hpte_update(mm, addr & HPAGE_MASK, ptep, old, 1);
- flush_tlb_pending();
- }
- *ptep = __pte(pte_val(pte) & ~_PAGE_HPTEFLAGS);
+ if (hugepd_none(*hpdp) && __hugepte_alloc(mm, hpdp, addr))
+ return NULL;
+
+ return hugepte_offset(hpdp, addr);
}
-pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
- pte_t *ptep)
+int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
{
- unsigned long old = pte_update(ptep, ~0UL);
-
- if (old & _PAGE_HASHPTE)
- hpte_update(mm, addr & HPAGE_MASK, ptep, old, 1);
- *ptep = __pte(0);
-
- return __pte(old);
+ return 0;
}
-struct slb_flush_info {
- struct mm_struct *mm;
- u16 newareas;
-};
-
-static void flush_low_segments(void *parm)
+static void free_hugepte_range(struct mmu_gather *tlb, hugepd_t *hpdp)
{
- struct slb_flush_info *fi = parm;
- unsigned long i;
-
- BUILD_BUG_ON((sizeof(fi->newareas)*8) != NUM_LOW_AREAS);
-
- if (current->active_mm != fi->mm)
- return;
-
- /* Only need to do anything if this CPU is working in the same
- * mm as the one which has changed */
+ pte_t *hugepte = hugepd_page(*hpdp);
- /* update the paca copy of the context struct */
- get_paca()->context = current->active_mm->context;
-
- asm volatile("isync" : : : "memory");
- for (i = 0; i < NUM_LOW_AREAS; i++) {
- if (! (fi->newareas & (1U << i)))
- continue;
- asm volatile("slbie %0"
- : : "r" ((i << SID_SHIFT) | SLBIE_C));
- }
- asm volatile("isync" : : : "memory");
+ hpdp->pd = 0;
+ tlb->need_flush = 1;
+ pgtable_free_tlb(tlb, pgtable_free_cache(hugepte, HUGEPTE_CACHE_NUM,
+ PGF_CACHENUM_MASK));
}
-static void flush_high_segments(void *parm)
+#ifdef CONFIG_PPC_64K_PAGES
+static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud,
+ unsigned long addr, unsigned long end,
+ unsigned long floor, unsigned long ceiling)
{
- struct slb_flush_info *fi = parm;
- unsigned long i, j;
-
+ pmd_t *pmd;
+ unsigned long next;
+ unsigned long start;
- BUILD_BUG_ON((sizeof(fi->newareas)*8) != NUM_HIGH_AREAS);
+ start = addr;
+ pmd = pmd_offset(pud, addr);
+ do {
+ next = pmd_addr_end(addr, end);
+ if (pmd_none(*pmd))
+ continue;
+ free_hugepte_range(tlb, (hugepd_t *)pmd);
+ } while (pmd++, addr = next, addr != end);
- if (current->active_mm != fi->mm)
+ start &= PUD_MASK;
+ if (start < floor)
return;
-
- /* Only need to do anything if this CPU is working in the same
- * mm as the one which has changed */
-
- /* update the paca copy of the context struct */
- get_paca()->context = current->active_mm->context;
-
- asm volatile("isync" : : : "memory");
- for (i = 0; i < NUM_HIGH_AREAS; i++) {
- if (! (fi->newareas & (1U << i)))
- continue;
- for (j = 0; j < (1UL << (HTLB_AREA_SHIFT-SID_SHIFT)); j++)
- asm volatile("slbie %0"
- :: "r" (((i << HTLB_AREA_SHIFT)
- + (j << SID_SHIFT)) | SLBIE_C));
+ if (ceiling) {
+ ceiling &= PUD_MASK;
+ if (!ceiling)
+ return;
}
- asm volatile("isync" : : : "memory");
-}
-
-static int prepare_low_area_for_htlb(struct mm_struct *mm, unsigned long area)
-{
- unsigned long start = area << SID_SHIFT;
- unsigned long end = (area+1) << SID_SHIFT;
- struct vm_area_struct *vma;
-
- BUG_ON(area >= NUM_LOW_AREAS);
-
- /* Check no VMAs are in the region */
- vma = find_vma(mm, start);
- if (vma && (vma->vm_start < end))
- return -EBUSY;
+ if (end - 1 > ceiling - 1)
+ return;
- return 0;
+ pmd = pmd_offset(pud, start);
+ pud_clear(pud);
+ pmd_free_tlb(tlb, pmd);
}
+#endif
-static int prepare_high_area_for_htlb(struct mm_struct *mm, unsigned long area)
+static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd,
+ unsigned long addr, unsigned long end,
+ unsigned long floor, unsigned long ceiling)
{
- unsigned long start = area << HTLB_AREA_SHIFT;
- unsigned long end = (area+1) << HTLB_AREA_SHIFT;
- struct vm_area_struct *vma;
-
- BUG_ON(area >= NUM_HIGH_AREAS);
+ pud_t *pud;
+ unsigned long next;
+ unsigned long start;
- /* 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;
+ start = addr;
+ pud = pud_offset(pgd, addr);
+ do {
+ next = pud_addr_end(addr, end);
+#ifdef CONFIG_PPC_64K_PAGES
+ if (pud_none_or_clear_bad(pud))
+ continue;
+ hugetlb_free_pmd_range(tlb, pud, addr, next, floor, ceiling);
+#else
+ if (pud_none(*pud))
+ continue;
+ free_hugepte_range(tlb, (hugepd_t *)pud);
+#endif
+ } while (pud++, addr = next, addr != end);
- /* Check no VMAs are in the region */
- vma = find_vma(mm, start);
- if (vma && (vma->vm_start < end))
- return -EBUSY;
+ start &= PGDIR_MASK;
+ if (start < floor)
+ return;
+ if (ceiling) {
+ ceiling &= PGDIR_MASK;
+ if (!ceiling)
+ return;
+ }
+ if (end - 1 > ceiling - 1)
+ return;
- return 0;
+ pud = pud_offset(pgd, start);
+ pgd_clear(pgd);
+ pud_free_tlb(tlb, pud);
}
-static int open_low_hpage_areas(struct mm_struct *mm, u16 newareas)
+/*
+ * This function frees user-level page tables of a process.
+ *
+ * Must be called with pagetable lock held.
+ */
+void hugetlb_free_pgd_range(struct mmu_gather **tlb,
+ unsigned long addr, unsigned long end,
+ unsigned long floor, unsigned long ceiling)
{
- unsigned long i;
- struct slb_flush_info fi;
-
- BUILD_BUG_ON((sizeof(newareas)*8) != NUM_LOW_AREAS);
- BUILD_BUG_ON((sizeof(mm->context.low_htlb_areas)*8) != NUM_LOW_AREAS);
-
- newareas &= ~(mm->context.low_htlb_areas);
- if (! newareas)
- return 0; /* The segments we want are already open */
-
- for (i = 0; i < NUM_LOW_AREAS; i++)
- if ((1 << i) & newareas)
- if (prepare_low_area_for_htlb(mm, i) != 0)
- return -EBUSY;
+ pgd_t *pgd;
+ unsigned long next;
+ unsigned long start;
- mm->context.low_htlb_areas |= newareas;
-
- /* the context change must make it to memory before the flush,
- * so that further SLB misses do the right thing. */
- mb();
+ /*
+ * Comments below take from the normal free_pgd_range(). They
+ * apply here too. The tests against HUGEPD_MASK below are
+ * essential, because we *don't* test for this at the bottom
+ * level. Without them we'll attempt to free a hugepte table
+ * when we unmap just part of it, even if there are other
+ * active mappings using it.
+ *
+ * The next few lines have given us lots of grief...
+ *
+ * Why are we testing HUGEPD* at this top level? Because
+ * often there will be no work to do at all, and we'd prefer
+ * not to go all the way down to the bottom just to discover
+ * that.
+ *
+ * Why all these "- 1"s? Because 0 represents both the bottom
+ * of the address space and the top of it (using -1 for the
+ * top wouldn't help much: the masks would do the wrong thing).
+ * The rule is that addr 0 and floor 0 refer to the bottom of
+ * the address space, but end 0 and ceiling 0 refer to the top
+ * Comparisons need to use "end - 1" and "ceiling - 1" (though
+ * that end 0 case should be mythical).
+ *
+ * Wherever addr is brought up or ceiling brought down, we
+ * must be careful to reject "the opposite 0" before it
+ * confuses the subsequent tests. But what about where end is
+ * brought down by HUGEPD_SIZE below? no, end can't go down to
+ * 0 there.
+ *
+ * Whereas we round start (addr) and ceiling down, by different
+ * masks at different levels, in order to test whether a table
+ * now has no other vmas using it, so can be freed, we don't
+ * bother to round floor or end up - the tests don't need that.
+ */
- fi.mm = mm;
- fi.newareas = newareas;
- on_each_cpu(flush_low_segments, &fi, 0, 1);
+ addr &= HUGEPD_MASK;
+ if (addr < floor) {
+ addr += HUGEPD_SIZE;
+ if (!addr)
+ return;
+ }
+ if (ceiling) {
+ ceiling &= HUGEPD_MASK;
+ if (!ceiling)
+ return;
+ }
+ if (end - 1 > ceiling - 1)
+ end -= HUGEPD_SIZE;
+ if (addr > end - 1)
+ return;
- return 0;
+ start = addr;
+ pgd = pgd_offset((*tlb)->mm, addr);
+ do {
+ BUG_ON(get_slice_psize((*tlb)->mm, addr) != mmu_huge_psize);
+ next = pgd_addr_end(addr, end);
+ if (pgd_none_or_clear_bad(pgd))
+ continue;
+ hugetlb_free_pud_range(*tlb, pgd, addr, next, floor, ceiling);
+ } while (pgd++, addr = next, addr != end);
}
-static int open_high_hpage_areas(struct mm_struct *mm, u16 newareas)
+void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep, pte_t pte)
{
- struct slb_flush_info fi;
- unsigned long i;
-
- BUILD_BUG_ON((sizeof(newareas)*8) != NUM_HIGH_AREAS);
- BUILD_BUG_ON((sizeof(mm->context.high_htlb_areas)*8)
- != NUM_HIGH_AREAS);
-
- newareas &= ~(mm->context.high_htlb_areas);
- if (! newareas)
- return 0; /* The areas we want are already open */
-
- for (i = 0; i < NUM_HIGH_AREAS; i++)
- if ((1 << i) & newareas)
- if (prepare_high_area_for_htlb(mm, i) != 0)
- return -EBUSY;
-
- mm->context.high_htlb_areas |= newareas;
-
- /* update the paca copy of the context struct */
- get_paca()->context = mm->context;
-
- /* the context change must make it to memory before the flush,
- * so that further SLB misses do the right thing. */
- mb();
-
- fi.mm = mm;
- fi.newareas = newareas;
- on_each_cpu(flush_high_segments, &fi, 0, 1);
-
- return 0;
+ if (pte_present(*ptep)) {
+ /* We open-code pte_clear because we need to pass the right
+ * argument to hpte_need_flush (huge / !huge). Might not be
+ * necessary anymore if we make hpte_need_flush() get the
+ * page size from the slices
+ */
+ pte_update(mm, addr & HPAGE_MASK, ptep, ~0UL, 1);
+ }
+ *ptep = __pte(pte_val(pte) & ~_PAGE_HPTEFLAGS);
}
-int prepare_hugepage_range(unsigned long addr, unsigned long len)
+pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep)
{
- int err = 0;
-
- if ( (addr+len) < addr )
- return -EINVAL;
-
- if (addr < 0x100000000UL)
- err = open_low_hpage_areas(current->mm,
- LOW_ESID_MASK(addr, len));
- if ((addr + len) > 0x100000000UL)
- err = open_high_hpage_areas(current->mm,
- HTLB_AREA_MASK(addr, len));
- if (err) {
- printk(KERN_DEBUG "prepare_hugepage_range(%lx, %lx)"
- " failed (lowmask: 0x%04hx, highmask: 0x%04hx)\n",
- addr, len,
- LOW_ESID_MASK(addr, len), HTLB_AREA_MASK(addr, len));
- return err;
- }
-
- return 0;
+ unsigned long old = pte_update(mm, addr, ptep, ~0UL, 1);
+ return __pte(old);
}
struct page *
pte_t *ptep;
struct page *page;
- if (! in_hugepage_area(mm->context, address))
+ if (get_slice_psize(mm, address) != mmu_huge_psize)
return ERR_PTR(-EINVAL);
ptep = huge_pte_offset(mm, address);
return NULL;
}
-/* Because we have an exclusive hugepage region which lies within the
- * normal user address space, we have to take special measures to make
- * non-huge mmap()s evade the hugepage reserved regions. */
-unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
- unsigned long len, unsigned long pgoff,
- unsigned long flags)
-{
- struct mm_struct *mm = current->mm;
- struct vm_area_struct *vma;
- unsigned long start_addr;
-
- if (len > TASK_SIZE)
- return -ENOMEM;
-
- if (addr) {
- addr = PAGE_ALIGN(addr);
- vma = find_vma(mm, addr);
- if (((TASK_SIZE - len) >= addr)
- && (!vma || (addr+len) <= vma->vm_start)
- && !is_hugepage_only_range(mm, addr,len))
- return addr;
- }
- if (len > mm->cached_hole_size) {
- start_addr = addr = mm->free_area_cache;
- } else {
- start_addr = addr = TASK_UNMAPPED_BASE;
- mm->cached_hole_size = 0;
- }
-
-full_search:
- vma = find_vma(mm, addr);
- while (TASK_SIZE - len >= addr) {
- BUG_ON(vma && (addr >= vma->vm_end));
-
- if (touches_hugepage_low_range(mm, addr, len)) {
- addr = ALIGN(addr+1, 1<<SID_SHIFT);
- vma = find_vma(mm, addr);
- continue;
- }
- if (touches_hugepage_high_range(mm, addr, len)) {
- addr = ALIGN(addr+1, 1UL<<HTLB_AREA_SHIFT);
- vma = find_vma(mm, addr);
- continue;
- }
- if (!vma || addr + len <= vma->vm_start) {
- /*
- * Remember the place where we stopped the search:
- */
- mm->free_area_cache = addr + len;
- return addr;
- }
- if (addr + mm->cached_hole_size < vma->vm_start)
- mm->cached_hole_size = vma->vm_start - addr;
- addr = vma->vm_end;
- vma = vma->vm_next;
- }
-
- /* Make sure we didn't miss any holes */
- if (start_addr != TASK_UNMAPPED_BASE) {
- start_addr = addr = TASK_UNMAPPED_BASE;
- mm->cached_hole_size = 0;
- goto full_search;
- }
- return -ENOMEM;
-}
-
-/*
- * This mmap-allocator allocates new areas top-down from below the
- * stack's low limit (the base):
- *
- * Because we have an exclusive hugepage region which lies within the
- * normal user address space, we have to take special measures to make
- * non-huge mmap()s evade the hugepage reserved regions.
- */
-unsigned long
-arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
- const unsigned long len, const unsigned long pgoff,
- const unsigned long flags)
-{
- struct vm_area_struct *vma, *prev_vma;
- struct mm_struct *mm = current->mm;
- unsigned long base = mm->mmap_base, addr = addr0;
- unsigned long largest_hole = mm->cached_hole_size;
- int first_time = 1;
-
- /* requested length too big for entire address space */
- if (len > TASK_SIZE)
- return -ENOMEM;
-
- /* dont allow allocations above current base */
- if (mm->free_area_cache > base)
- mm->free_area_cache = base;
-
- /* requesting a specific address */
- if (addr) {
- addr = PAGE_ALIGN(addr);
- vma = find_vma(mm, addr);
- if (TASK_SIZE - len >= addr &&
- (!vma || addr + len <= vma->vm_start)
- && !is_hugepage_only_range(mm, addr,len))
- return addr;
- }
-
- if (len <= largest_hole) {
- largest_hole = 0;
- mm->free_area_cache = base;
- }
-try_again:
- /* make sure it can fit in the remaining address space */
- if (mm->free_area_cache < len)
- goto fail;
-
- /* either no address requested or cant fit in requested address hole */
- addr = (mm->free_area_cache - len) & PAGE_MASK;
- do {
-hugepage_recheck:
- if (touches_hugepage_low_range(mm, addr, len)) {
- addr = (addr & ((~0) << SID_SHIFT)) - len;
- goto hugepage_recheck;
- } else if (touches_hugepage_high_range(mm, addr, len)) {
- addr = (addr & ((~0UL) << HTLB_AREA_SHIFT)) - len;
- goto hugepage_recheck;
- }
-
- /*
- * Lookup failure means no vma is above this address,
- * i.e. return with success:
- */
- if (!(vma = find_vma_prev(mm, addr, &prev_vma)))
- return addr;
-
- /*
- * new region fits between prev_vma->vm_end and
- * vma->vm_start, use it:
- */
- if (addr+len <= vma->vm_start &&
- (!prev_vma || (addr >= prev_vma->vm_end))) {
- /* remember the address as a hint for next time */
- mm->cached_hole_size = largest_hole;
- return (mm->free_area_cache = addr);
- } else {
- /* pull free_area_cache down to the first hole */
- if (mm->free_area_cache == vma->vm_end) {
- mm->free_area_cache = vma->vm_start;
- mm->cached_hole_size = largest_hole;
- }
- }
-
- /* remember the largest hole we saw so far */
- if (addr + largest_hole < vma->vm_start)
- largest_hole = vma->vm_start - addr;
-
- /* try just below the current vma->vm_start */
- addr = vma->vm_start-len;
- } while (len <= vma->vm_start);
-
-fail:
- /*
- * if hint left us with no space for the requested
- * mapping then try again:
- */
- if (first_time) {
- mm->free_area_cache = base;
- largest_hole = 0;
- first_time = 0;
- goto try_again;
- }
- /*
- * A failed mmap() very likely causes application failure,
- * so fall back to the bottom-up function here. This scenario
- * can happen with large stack limits and large mmap()
- * allocations.
- */
- mm->free_area_cache = TASK_UNMAPPED_BASE;
- mm->cached_hole_size = ~0UL;
- addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
- /*
- * Restore the topdown base:
- */
- mm->free_area_cache = base;
- mm->cached_hole_size = ~0UL;
-
- return addr;
-}
-
-static int htlb_check_hinted_area(unsigned long addr, unsigned long len)
-{
- struct vm_area_struct *vma;
-
- vma = find_vma(current->mm, addr);
- if (!vma || ((addr + len) <= vma->vm_start))
- return 0;
-
- return -ENOMEM;
-}
-
-static unsigned long htlb_get_low_area(unsigned long len, u16 segmask)
-{
- unsigned long addr = 0;
- struct vm_area_struct *vma;
-
- vma = find_vma(current->mm, addr);
- while (addr + len <= 0x100000000UL) {
- BUG_ON(vma && (addr >= vma->vm_end)); /* invariant */
-
- if (! __within_hugepage_low_range(addr, len, segmask)) {
- addr = ALIGN(addr+1, 1<<SID_SHIFT);
- vma = find_vma(current->mm, addr);
- continue;
- }
-
- if (!vma || (addr + len) <= vma->vm_start)
- return addr;
- addr = ALIGN(vma->vm_end, HPAGE_SIZE);
- /* Depending on segmask this might not be a confirmed
- * hugepage region, so the ALIGN could have skipped
- * some VMAs */
- vma = find_vma(current->mm, addr);
- }
-
- return -ENOMEM;
-}
-
-static unsigned long htlb_get_high_area(unsigned long len, u16 areamask)
-{
- unsigned long addr = 0x100000000UL;
- struct vm_area_struct *vma;
-
- vma = find_vma(current->mm, addr);
- while (addr + len <= TASK_SIZE_USER64) {
- BUG_ON(vma && (addr >= vma->vm_end)); /* invariant */
-
- if (! __within_hugepage_high_range(addr, len, areamask)) {
- addr = ALIGN(addr+1, 1UL<<HTLB_AREA_SHIFT);
- vma = find_vma(current->mm, addr);
- continue;
- }
-
- if (!vma || (addr + len) <= vma->vm_start)
- return addr;
- addr = ALIGN(vma->vm_end, HPAGE_SIZE);
- /* Depending on segmask this might not be a confirmed
- * hugepage region, so the ALIGN could have skipped
- * some VMAs */
- vma = find_vma(current->mm, addr);
- }
-
- return -ENOMEM;
-}
unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
unsigned long len, unsigned long pgoff,
unsigned long flags)
{
- int lastshift;
- u16 areamask, curareas;
-
- if (HPAGE_SHIFT == 0)
- return -EINVAL;
- if (len & ~HPAGE_MASK)
- return -EINVAL;
-
- if (!cpu_has_feature(CPU_FTR_16M_PAGE))
- return -EINVAL;
-
- /* Paranoia, caller should have dealt with this */
- BUG_ON((addr + len) < addr);
-
- if (test_thread_flag(TIF_32BIT)) {
- /* Paranoia, caller should have dealt with this */
- BUG_ON((addr + len) > 0x100000000UL);
-
- curareas = current->mm->context.low_htlb_areas;
-
- /* First see if we can use the hint address */
- if (addr && (htlb_check_hinted_area(addr, len) == 0)) {
- areamask = LOW_ESID_MASK(addr, len);
- if (open_low_hpage_areas(current->mm, areamask) == 0)
- return addr;
- }
-
- /* Next see if we can map in the existing low areas */
- addr = htlb_get_low_area(len, curareas);
- if (addr != -ENOMEM)
- return addr;
-
- /* Finally go looking for areas to open */
- lastshift = 0;
- for (areamask = LOW_ESID_MASK(0x100000000UL-len, len);
- ! lastshift; areamask >>=1) {
- if (areamask & 1)
- lastshift = 1;
-
- addr = htlb_get_low_area(len, curareas | areamask);
- if ((addr != -ENOMEM)
- && open_low_hpage_areas(current->mm, areamask) == 0)
- return addr;
- }
- } else {
- curareas = current->mm->context.high_htlb_areas;
-
- /* First see if we can use the hint address */
- /* We discourage 64-bit processes from doing hugepage
- * mappings below 4GB (must use MAP_FIXED) */
- if ((addr >= 0x100000000UL)
- && (htlb_check_hinted_area(addr, len) == 0)) {
- areamask = HTLB_AREA_MASK(addr, len);
- if (open_high_hpage_areas(current->mm, areamask) == 0)
- return addr;
- }
-
- /* Next see if we can map in the existing high areas */
- addr = htlb_get_high_area(len, curareas);
- if (addr != -ENOMEM)
- return addr;
-
- /* Finally go looking for areas to open */
- lastshift = 0;
- for (areamask = HTLB_AREA_MASK(TASK_SIZE_USER64-len, len);
- ! lastshift; areamask >>=1) {
- if (areamask & 1)
- lastshift = 1;
-
- addr = htlb_get_high_area(len, curareas | areamask);
- if ((addr != -ENOMEM)
- && open_high_hpage_areas(current->mm, areamask) == 0)
- return addr;
- }
- }
- printk(KERN_DEBUG "hugetlb_get_unmapped_area() unable to open"
- " enough areas\n");
- return -ENOMEM;
+ return slice_get_unmapped_area(addr, len, flags,
+ mmu_huge_psize, 1, 0);
}
/*
/* Primary is full, try the secondary */
if (unlikely(slot == -1)) {
- new_pte |= _PAGE_F_SECOND;
hpte_group = ((~hash & htab_hash_mask) *
HPTES_PER_GROUP) & ~0x7UL;
slot = ppc_md.hpte_insert(hpte_group, va, pa, rflags,
if (unlikely(slot == -2))
panic("hash_huge_page: pte_insert failed\n");
- new_pte |= (slot << 12) & _PAGE_F_GIX;
+ new_pte |= (slot << 12) & (_PAGE_F_SECOND | _PAGE_F_GIX);
}
/*
out:
return err;
}
+
+static void zero_ctor(void *addr, struct kmem_cache *cache, unsigned long flags)
+{
+ memset(addr, 0, kmem_cache_size(cache));
+}
+
+static int __init hugetlbpage_init(void)
+{
+ if (!cpu_has_feature(CPU_FTR_16M_PAGE))
+ return -ENODEV;
+
+ huge_pgtable_cache = kmem_cache_create("hugepte_cache",
+ HUGEPTE_TABLE_SIZE,
+ HUGEPTE_TABLE_SIZE,
+ 0,
+ zero_ctor, NULL);
+ if (! huge_pgtable_cache)
+ panic("hugetlbpage_init(): could not create hugepte cache\n");
+
+ return 0;
+}
+
+module_init(hugetlbpage_init);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff