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![Roel Kluin](/assets/img/avatar_default.png)
Replace some SPIN_LOCK_UNLOCKED with DEFINE_SPINLOCK Signed-off-by: Roel Kluin <12o3l@tiscali.nl> Acked-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
636 lines
17 KiB
C
636 lines
17 KiB
C
/*
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* address space "slices" (meta-segments) support
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*
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* Copyright (C) 2007 Benjamin Herrenschmidt, IBM Corporation.
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*
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* Based on hugetlb implementation
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*
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* Copyright (C) 2003 David Gibson, IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#undef DEBUG
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/pagemap.h>
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#include <linux/err.h>
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <asm/mman.h>
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#include <asm/mmu.h>
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#include <asm/spu.h>
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static DEFINE_SPINLOCK(slice_convert_lock);
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#ifdef DEBUG
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int _slice_debug = 1;
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static void slice_print_mask(const char *label, struct slice_mask mask)
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{
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char *p, buf[16 + 3 + 16 + 1];
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int i;
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if (!_slice_debug)
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return;
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p = buf;
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for (i = 0; i < SLICE_NUM_LOW; i++)
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*(p++) = (mask.low_slices & (1 << i)) ? '1' : '0';
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*(p++) = ' ';
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*(p++) = '-';
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*(p++) = ' ';
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for (i = 0; i < SLICE_NUM_HIGH; i++)
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*(p++) = (mask.high_slices & (1 << i)) ? '1' : '0';
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*(p++) = 0;
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printk(KERN_DEBUG "%s:%s\n", label, buf);
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}
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#define slice_dbg(fmt...) do { if (_slice_debug) pr_debug(fmt); } while(0)
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#else
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static void slice_print_mask(const char *label, struct slice_mask mask) {}
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#define slice_dbg(fmt...)
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#endif
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static struct slice_mask slice_range_to_mask(unsigned long start,
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unsigned long len)
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{
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unsigned long end = start + len - 1;
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struct slice_mask ret = { 0, 0 };
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if (start < SLICE_LOW_TOP) {
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unsigned long mend = min(end, SLICE_LOW_TOP);
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unsigned long mstart = min(start, SLICE_LOW_TOP);
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ret.low_slices = (1u << (GET_LOW_SLICE_INDEX(mend) + 1))
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- (1u << GET_LOW_SLICE_INDEX(mstart));
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}
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if ((start + len) > SLICE_LOW_TOP)
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ret.high_slices = (1u << (GET_HIGH_SLICE_INDEX(end) + 1))
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- (1u << GET_HIGH_SLICE_INDEX(start));
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return ret;
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}
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static int slice_area_is_free(struct mm_struct *mm, unsigned long addr,
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unsigned long len)
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{
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struct vm_area_struct *vma;
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if ((mm->task_size - len) < addr)
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return 0;
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vma = find_vma(mm, addr);
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return (!vma || (addr + len) <= vma->vm_start);
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}
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static int slice_low_has_vma(struct mm_struct *mm, unsigned long slice)
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{
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return !slice_area_is_free(mm, slice << SLICE_LOW_SHIFT,
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1ul << SLICE_LOW_SHIFT);
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}
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static int slice_high_has_vma(struct mm_struct *mm, unsigned long slice)
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{
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unsigned long start = slice << SLICE_HIGH_SHIFT;
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unsigned long end = start + (1ul << SLICE_HIGH_SHIFT);
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/* Hack, so that each addresses is controlled by exactly one
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* of the high or low area bitmaps, the first high area starts
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* at 4GB, not 0 */
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if (start == 0)
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start = SLICE_LOW_TOP;
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return !slice_area_is_free(mm, start, end - start);
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}
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static struct slice_mask slice_mask_for_free(struct mm_struct *mm)
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{
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struct slice_mask ret = { 0, 0 };
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unsigned long i;
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for (i = 0; i < SLICE_NUM_LOW; i++)
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if (!slice_low_has_vma(mm, i))
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ret.low_slices |= 1u << i;
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if (mm->task_size <= SLICE_LOW_TOP)
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return ret;
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for (i = 0; i < SLICE_NUM_HIGH; i++)
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if (!slice_high_has_vma(mm, i))
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ret.high_slices |= 1u << i;
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return ret;
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}
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static struct slice_mask slice_mask_for_size(struct mm_struct *mm, int psize)
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{
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struct slice_mask ret = { 0, 0 };
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unsigned long i;
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u64 psizes;
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psizes = mm->context.low_slices_psize;
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for (i = 0; i < SLICE_NUM_LOW; i++)
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if (((psizes >> (i * 4)) & 0xf) == psize)
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ret.low_slices |= 1u << i;
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psizes = mm->context.high_slices_psize;
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for (i = 0; i < SLICE_NUM_HIGH; i++)
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if (((psizes >> (i * 4)) & 0xf) == psize)
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ret.high_slices |= 1u << i;
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return ret;
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}
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static int slice_check_fit(struct slice_mask mask, struct slice_mask available)
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{
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return (mask.low_slices & available.low_slices) == mask.low_slices &&
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(mask.high_slices & available.high_slices) == mask.high_slices;
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}
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static void slice_flush_segments(void *parm)
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{
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struct mm_struct *mm = parm;
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unsigned long flags;
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if (mm != current->active_mm)
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return;
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/* update the paca copy of the context struct */
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get_paca()->context = current->active_mm->context;
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local_irq_save(flags);
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slb_flush_and_rebolt();
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local_irq_restore(flags);
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}
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static void slice_convert(struct mm_struct *mm, struct slice_mask mask, int psize)
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{
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/* Write the new slice psize bits */
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u64 lpsizes, hpsizes;
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unsigned long i, flags;
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slice_dbg("slice_convert(mm=%p, psize=%d)\n", mm, psize);
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slice_print_mask(" mask", mask);
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/* We need to use a spinlock here to protect against
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* concurrent 64k -> 4k demotion ...
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*/
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spin_lock_irqsave(&slice_convert_lock, flags);
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lpsizes = mm->context.low_slices_psize;
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for (i = 0; i < SLICE_NUM_LOW; i++)
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if (mask.low_slices & (1u << i))
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lpsizes = (lpsizes & ~(0xful << (i * 4))) |
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(((unsigned long)psize) << (i * 4));
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hpsizes = mm->context.high_slices_psize;
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for (i = 0; i < SLICE_NUM_HIGH; i++)
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if (mask.high_slices & (1u << i))
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hpsizes = (hpsizes & ~(0xful << (i * 4))) |
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(((unsigned long)psize) << (i * 4));
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mm->context.low_slices_psize = lpsizes;
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mm->context.high_slices_psize = hpsizes;
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slice_dbg(" lsps=%lx, hsps=%lx\n",
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mm->context.low_slices_psize,
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mm->context.high_slices_psize);
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spin_unlock_irqrestore(&slice_convert_lock, flags);
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mb();
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/* XXX this is sub-optimal but will do for now */
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on_each_cpu(slice_flush_segments, mm, 0, 1);
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#ifdef CONFIG_SPU_BASE
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spu_flush_all_slbs(mm);
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#endif
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}
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static unsigned long slice_find_area_bottomup(struct mm_struct *mm,
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unsigned long len,
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struct slice_mask available,
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int psize, int use_cache)
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{
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struct vm_area_struct *vma;
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unsigned long start_addr, addr;
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struct slice_mask mask;
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int pshift = max_t(int, mmu_psize_defs[psize].shift, PAGE_SHIFT);
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if (use_cache) {
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if (len <= mm->cached_hole_size) {
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start_addr = addr = TASK_UNMAPPED_BASE;
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mm->cached_hole_size = 0;
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} else
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start_addr = addr = mm->free_area_cache;
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} else
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start_addr = addr = TASK_UNMAPPED_BASE;
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full_search:
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for (;;) {
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addr = _ALIGN_UP(addr, 1ul << pshift);
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if ((TASK_SIZE - len) < addr)
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break;
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vma = find_vma(mm, addr);
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BUG_ON(vma && (addr >= vma->vm_end));
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mask = slice_range_to_mask(addr, len);
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if (!slice_check_fit(mask, available)) {
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if (addr < SLICE_LOW_TOP)
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addr = _ALIGN_UP(addr + 1, 1ul << SLICE_LOW_SHIFT);
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else
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addr = _ALIGN_UP(addr + 1, 1ul << SLICE_HIGH_SHIFT);
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continue;
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}
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if (!vma || addr + len <= vma->vm_start) {
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/*
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* Remember the place where we stopped the search:
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*/
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if (use_cache)
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mm->free_area_cache = addr + len;
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return addr;
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}
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if (use_cache && (addr + mm->cached_hole_size) < vma->vm_start)
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mm->cached_hole_size = vma->vm_start - addr;
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addr = vma->vm_end;
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}
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/* Make sure we didn't miss any holes */
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if (use_cache && start_addr != TASK_UNMAPPED_BASE) {
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start_addr = addr = TASK_UNMAPPED_BASE;
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mm->cached_hole_size = 0;
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goto full_search;
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}
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return -ENOMEM;
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}
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static unsigned long slice_find_area_topdown(struct mm_struct *mm,
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unsigned long len,
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struct slice_mask available,
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int psize, int use_cache)
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{
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struct vm_area_struct *vma;
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unsigned long addr;
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struct slice_mask mask;
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int pshift = max_t(int, mmu_psize_defs[psize].shift, PAGE_SHIFT);
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/* check if free_area_cache is useful for us */
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if (use_cache) {
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if (len <= mm->cached_hole_size) {
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mm->cached_hole_size = 0;
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mm->free_area_cache = mm->mmap_base;
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}
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/* either no address requested or can't fit in requested
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* address hole
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*/
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addr = mm->free_area_cache;
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/* make sure it can fit in the remaining address space */
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if (addr > len) {
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addr = _ALIGN_DOWN(addr - len, 1ul << pshift);
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mask = slice_range_to_mask(addr, len);
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if (slice_check_fit(mask, available) &&
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slice_area_is_free(mm, addr, len))
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/* remember the address as a hint for
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* next time
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*/
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return (mm->free_area_cache = addr);
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}
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}
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addr = mm->mmap_base;
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while (addr > len) {
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/* Go down by chunk size */
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addr = _ALIGN_DOWN(addr - len, 1ul << pshift);
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/* Check for hit with different page size */
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mask = slice_range_to_mask(addr, len);
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if (!slice_check_fit(mask, available)) {
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if (addr < SLICE_LOW_TOP)
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addr = _ALIGN_DOWN(addr, 1ul << SLICE_LOW_SHIFT);
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else if (addr < (1ul << SLICE_HIGH_SHIFT))
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addr = SLICE_LOW_TOP;
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else
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addr = _ALIGN_DOWN(addr, 1ul << SLICE_HIGH_SHIFT);
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continue;
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}
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/*
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* Lookup failure means no vma is above this address,
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* else if new region fits below vma->vm_start,
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* return with success:
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*/
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vma = find_vma(mm, addr);
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if (!vma || (addr + len) <= vma->vm_start) {
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/* remember the address as a hint for next time */
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if (use_cache)
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mm->free_area_cache = addr;
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return addr;
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}
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/* remember the largest hole we saw so far */
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if (use_cache && (addr + mm->cached_hole_size) < vma->vm_start)
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mm->cached_hole_size = vma->vm_start - addr;
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/* try just below the current vma->vm_start */
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addr = vma->vm_start;
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}
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/*
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* A failed mmap() very likely causes application failure,
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* so fall back to the bottom-up function here. This scenario
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* can happen with large stack limits and large mmap()
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* allocations.
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*/
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addr = slice_find_area_bottomup(mm, len, available, psize, 0);
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/*
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* Restore the topdown base:
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*/
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if (use_cache) {
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mm->free_area_cache = mm->mmap_base;
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mm->cached_hole_size = ~0UL;
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}
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return addr;
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}
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static unsigned long slice_find_area(struct mm_struct *mm, unsigned long len,
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struct slice_mask mask, int psize,
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int topdown, int use_cache)
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{
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if (topdown)
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return slice_find_area_topdown(mm, len, mask, psize, use_cache);
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else
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return slice_find_area_bottomup(mm, len, mask, psize, use_cache);
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}
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unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
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unsigned long flags, unsigned int psize,
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int topdown, int use_cache)
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{
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struct slice_mask mask;
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struct slice_mask good_mask;
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struct slice_mask potential_mask = {0,0} /* silence stupid warning */;
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int pmask_set = 0;
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int fixed = (flags & MAP_FIXED);
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int pshift = max_t(int, mmu_psize_defs[psize].shift, PAGE_SHIFT);
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struct mm_struct *mm = current->mm;
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/* Sanity checks */
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BUG_ON(mm->task_size == 0);
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slice_dbg("slice_get_unmapped_area(mm=%p, psize=%d...\n", mm, psize);
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slice_dbg(" addr=%lx, len=%lx, flags=%lx, topdown=%d, use_cache=%d\n",
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addr, len, flags, topdown, use_cache);
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if (len > mm->task_size)
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return -ENOMEM;
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if (len & ((1ul << pshift) - 1))
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return -EINVAL;
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if (fixed && (addr & ((1ul << pshift) - 1)))
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return -EINVAL;
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if (fixed && addr > (mm->task_size - len))
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return -EINVAL;
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/* If hint, make sure it matches our alignment restrictions */
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if (!fixed && addr) {
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addr = _ALIGN_UP(addr, 1ul << pshift);
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slice_dbg(" aligned addr=%lx\n", addr);
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}
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/* First makeup a "good" mask of slices that have the right size
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* already
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*/
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good_mask = slice_mask_for_size(mm, psize);
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slice_print_mask(" good_mask", good_mask);
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/* First check hint if it's valid or if we have MAP_FIXED */
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if ((addr != 0 || fixed) && (mm->task_size - len) >= addr) {
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/* Don't bother with hint if it overlaps a VMA */
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if (!fixed && !slice_area_is_free(mm, addr, len))
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goto search;
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/* Build a mask for the requested range */
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mask = slice_range_to_mask(addr, len);
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slice_print_mask(" mask", mask);
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/* Check if we fit in the good mask. If we do, we just return,
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* nothing else to do
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*/
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if (slice_check_fit(mask, good_mask)) {
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slice_dbg(" fits good !\n");
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return addr;
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}
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/* We don't fit in the good mask, check what other slices are
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* empty and thus can be converted
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*/
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potential_mask = slice_mask_for_free(mm);
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potential_mask.low_slices |= good_mask.low_slices;
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potential_mask.high_slices |= good_mask.high_slices;
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pmask_set = 1;
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slice_print_mask(" potential", potential_mask);
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if (slice_check_fit(mask, potential_mask)) {
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slice_dbg(" fits potential !\n");
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goto convert;
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}
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}
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/* If we have MAP_FIXED and failed the above step, then error out */
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if (fixed)
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return -EBUSY;
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search:
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slice_dbg(" search...\n");
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/* Now let's see if we can find something in the existing slices
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* for that size
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*/
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addr = slice_find_area(mm, len, good_mask, psize, topdown, use_cache);
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if (addr != -ENOMEM) {
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/* Found within the good mask, we don't have to setup,
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* we thus return directly
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*/
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slice_dbg(" found area at 0x%lx\n", addr);
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return addr;
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}
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/* Won't fit, check what can be converted */
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if (!pmask_set) {
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potential_mask = slice_mask_for_free(mm);
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potential_mask.low_slices |= good_mask.low_slices;
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potential_mask.high_slices |= good_mask.high_slices;
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pmask_set = 1;
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slice_print_mask(" potential", potential_mask);
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}
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/* Now let's see if we can find something in the existing slices
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* for that size
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*/
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addr = slice_find_area(mm, len, potential_mask, psize, topdown,
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use_cache);
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|
if (addr == -ENOMEM)
|
|
return -ENOMEM;
|
|
|
|
mask = slice_range_to_mask(addr, len);
|
|
slice_dbg(" found potential area at 0x%lx\n", addr);
|
|
slice_print_mask(" mask", mask);
|
|
|
|
convert:
|
|
slice_convert(mm, mask, psize);
|
|
return addr;
|
|
|
|
}
|
|
EXPORT_SYMBOL_GPL(slice_get_unmapped_area);
|
|
|
|
unsigned long arch_get_unmapped_area(struct file *filp,
|
|
unsigned long addr,
|
|
unsigned long len,
|
|
unsigned long pgoff,
|
|
unsigned long flags)
|
|
{
|
|
return slice_get_unmapped_area(addr, len, flags,
|
|
current->mm->context.user_psize,
|
|
0, 1);
|
|
}
|
|
|
|
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)
|
|
{
|
|
return slice_get_unmapped_area(addr0, len, flags,
|
|
current->mm->context.user_psize,
|
|
1, 1);
|
|
}
|
|
|
|
unsigned int get_slice_psize(struct mm_struct *mm, unsigned long addr)
|
|
{
|
|
u64 psizes;
|
|
int index;
|
|
|
|
if (addr < SLICE_LOW_TOP) {
|
|
psizes = mm->context.low_slices_psize;
|
|
index = GET_LOW_SLICE_INDEX(addr);
|
|
} else {
|
|
psizes = mm->context.high_slices_psize;
|
|
index = GET_HIGH_SLICE_INDEX(addr);
|
|
}
|
|
|
|
return (psizes >> (index * 4)) & 0xf;
|
|
}
|
|
EXPORT_SYMBOL_GPL(get_slice_psize);
|
|
|
|
/*
|
|
* This is called by hash_page when it needs to do a lazy conversion of
|
|
* an address space from real 64K pages to combo 4K pages (typically
|
|
* when hitting a non cacheable mapping on a processor or hypervisor
|
|
* that won't allow them for 64K pages).
|
|
*
|
|
* This is also called in init_new_context() to change back the user
|
|
* psize from whatever the parent context had it set to
|
|
* N.B. This may be called before mm->context.id has been set.
|
|
*
|
|
* This function will only change the content of the {low,high)_slice_psize
|
|
* masks, it will not flush SLBs as this shall be handled lazily by the
|
|
* caller.
|
|
*/
|
|
void slice_set_user_psize(struct mm_struct *mm, unsigned int psize)
|
|
{
|
|
unsigned long flags, lpsizes, hpsizes;
|
|
unsigned int old_psize;
|
|
int i;
|
|
|
|
slice_dbg("slice_set_user_psize(mm=%p, psize=%d)\n", mm, psize);
|
|
|
|
spin_lock_irqsave(&slice_convert_lock, flags);
|
|
|
|
old_psize = mm->context.user_psize;
|
|
slice_dbg(" old_psize=%d\n", old_psize);
|
|
if (old_psize == psize)
|
|
goto bail;
|
|
|
|
mm->context.user_psize = psize;
|
|
wmb();
|
|
|
|
lpsizes = mm->context.low_slices_psize;
|
|
for (i = 0; i < SLICE_NUM_LOW; i++)
|
|
if (((lpsizes >> (i * 4)) & 0xf) == old_psize)
|
|
lpsizes = (lpsizes & ~(0xful << (i * 4))) |
|
|
(((unsigned long)psize) << (i * 4));
|
|
|
|
hpsizes = mm->context.high_slices_psize;
|
|
for (i = 0; i < SLICE_NUM_HIGH; i++)
|
|
if (((hpsizes >> (i * 4)) & 0xf) == old_psize)
|
|
hpsizes = (hpsizes & ~(0xful << (i * 4))) |
|
|
(((unsigned long)psize) << (i * 4));
|
|
|
|
mm->context.low_slices_psize = lpsizes;
|
|
mm->context.high_slices_psize = hpsizes;
|
|
|
|
slice_dbg(" lsps=%lx, hsps=%lx\n",
|
|
mm->context.low_slices_psize,
|
|
mm->context.high_slices_psize);
|
|
|
|
bail:
|
|
spin_unlock_irqrestore(&slice_convert_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* is_hugepage_only_range() is used by generic code to verify wether
|
|
* a normal mmap mapping (non hugetlbfs) is valid on a given area.
|
|
*
|
|
* until the generic code provides a more generic hook and/or starts
|
|
* calling arch get_unmapped_area for MAP_FIXED (which our implementation
|
|
* here knows how to deal with), we hijack it to keep standard mappings
|
|
* away from us.
|
|
*
|
|
* because of that generic code limitation, MAP_FIXED mapping cannot
|
|
* "convert" back a slice with no VMAs to the standard page size, only
|
|
* get_unmapped_area() can. It would be possible to fix it here but I
|
|
* prefer working on fixing the generic code instead.
|
|
*
|
|
* WARNING: This will not work if hugetlbfs isn't enabled since the
|
|
* generic code will redefine that function as 0 in that. This is ok
|
|
* for now as we only use slices with hugetlbfs enabled. This should
|
|
* be fixed as the generic code gets fixed.
|
|
*/
|
|
int is_hugepage_only_range(struct mm_struct *mm, unsigned long addr,
|
|
unsigned long len)
|
|
{
|
|
struct slice_mask mask, available;
|
|
|
|
mask = slice_range_to_mask(addr, len);
|
|
available = slice_mask_for_size(mm, mm->context.user_psize);
|
|
|
|
#if 0 /* too verbose */
|
|
slice_dbg("is_hugepage_only_range(mm=%p, addr=%lx, len=%lx)\n",
|
|
mm, addr, len);
|
|
slice_print_mask(" mask", mask);
|
|
slice_print_mask(" available", available);
|
|
#endif
|
|
return !slice_check_fit(mask, available);
|
|
}
|
|
|