return pp;
}
+#ifdef CONFIG_PPC_MM_SLICES
+unsigned int get_paca_psize(unsigned long addr)
+{
+ unsigned long index, slices;
+
+ if (addr < SLICE_LOW_TOP) {
+ slices = get_paca()->context.low_slices_psize;
+ index = GET_LOW_SLICE_INDEX(addr);
+ } else {
+ slices = get_paca()->context.high_slices_psize;
+ index = GET_HIGH_SLICE_INDEX(addr);
+ }
+ return (slices >> (index * 4)) & 0xF;
+}
+
+#else
+unsigned int get_paca_psize(unsigned long addr)
+{
+ return get_paca()->context.user_psize;
+}
+#endif
+
/*
* Demote a segment to using 4k pages.
* For now this makes the whole process use 4k pages.
#ifdef CONFIG_PPC_64K_PAGES
void demote_segment_4k(struct mm_struct *mm, unsigned long addr)
{
- if (mm->context.user_psize == MMU_PAGE_4K)
+ if (get_slice_psize(mm, addr) == MMU_PAGE_4K)
return;
- slice_set_user_psize(mm, MMU_PAGE_4K);
+ slice_set_range_psize(mm, addr, 1, MMU_PAGE_4K);
#ifdef CONFIG_SPU_BASE
spu_flush_all_slbs(mm);
#endif
- if (get_paca()->context.user_psize != MMU_PAGE_4K) {
+ if (get_paca_psize(addr) != MMU_PAGE_4K) {
get_paca()->context = mm->context;
slb_flush_and_rebolt();
}
DBG_LOW(" user region with no mm !\n");
return 1;
}
-#ifdef CONFIG_PPC_MM_SLICES
psize = get_slice_psize(mm, ea);
-#else
- psize = mm->context.user_psize;
-#endif
ssize = user_segment_size(ea);
vsid = get_vsid(mm->context.id, ea, ssize);
break;
/* Do actual hashing */
#ifdef CONFIG_PPC_64K_PAGES
/* If _PAGE_4K_PFN is set, make sure this is a 4k segment */
- if (pte_val(*ptep) & _PAGE_4K_PFN) {
+ if ((pte_val(*ptep) & _PAGE_4K_PFN) && psize == MMU_PAGE_64K) {
demote_segment_4k(mm, ea);
psize = MMU_PAGE_4K;
}
}
}
if (user_region) {
- if (psize != get_paca()->context.user_psize) {
+ if (psize != get_paca_psize(ea)) {
get_paca()->context = mm->context;
slb_flush_and_rebolt();
}
mm->context.high_slices_psize);
spin_unlock_irqrestore(&slice_convert_lock, flags);
- mb();
- /* XXX this is sub-optimal but will do for now */
- on_each_cpu(slice_flush_segments, mm, 0, 1);
#ifdef CONFIG_SPU_BASE
spu_flush_all_slbs(mm);
#endif
return slice_find_area_bottomup(mm, len, mask, psize, use_cache);
}
+#define or_mask(dst, src) do { \
+ (dst).low_slices |= (src).low_slices; \
+ (dst).high_slices |= (src).high_slices; \
+} while (0)
+
+#define andnot_mask(dst, src) do { \
+ (dst).low_slices &= ~(src).low_slices; \
+ (dst).high_slices &= ~(src).high_slices; \
+} while (0)
+
+#ifdef CONFIG_PPC_64K_PAGES
+#define MMU_PAGE_BASE MMU_PAGE_64K
+#else
+#define MMU_PAGE_BASE MMU_PAGE_4K
+#endif
+
unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
unsigned long flags, unsigned int psize,
int topdown, int use_cache)
{
- struct slice_mask mask;
+ struct slice_mask mask = {0, 0};
struct slice_mask good_mask;
struct slice_mask potential_mask = {0,0} /* silence stupid warning */;
- int pmask_set = 0;
+ struct slice_mask compat_mask = {0, 0};
int fixed = (flags & MAP_FIXED);
int pshift = max_t(int, mmu_psize_defs[psize].shift, PAGE_SHIFT);
struct mm_struct *mm = current->mm;
+ unsigned long newaddr;
/* Sanity checks */
BUG_ON(mm->task_size == 0);
if (!fixed && addr) {
addr = _ALIGN_UP(addr, 1ul << pshift);
slice_dbg(" aligned addr=%lx\n", addr);
+ /* Ignore hint if it's too large or overlaps a VMA */
+ if (addr > mm->task_size - len ||
+ !slice_area_is_free(mm, addr, len))
+ addr = 0;
}
- /* First makeup a "good" mask of slices that have the right size
+ /* First make up a "good" mask of slices that have the right size
* already
*/
good_mask = slice_mask_for_size(mm, psize);
slice_print_mask(" good_mask", good_mask);
- /* First check hint if it's valid or if we have MAP_FIXED */
- if ((addr != 0 || fixed) && (mm->task_size - len) >= addr) {
+ /*
+ * Here "good" means slices that are already the right page size,
+ * "compat" means slices that have a compatible page size (i.e.
+ * 4k in a 64k pagesize kernel), and "free" means slices without
+ * any VMAs.
+ *
+ * If MAP_FIXED:
+ * check if fits in good | compat => OK
+ * check if fits in good | compat | free => convert free
+ * else bad
+ * If have hint:
+ * check if hint fits in good => OK
+ * check if hint fits in good | free => convert free
+ * Otherwise:
+ * search in good, found => OK
+ * search in good | free, found => convert free
+ * search in good | compat | free, found => convert free.
+ */
- /* Don't bother with hint if it overlaps a VMA */
- if (!fixed && !slice_area_is_free(mm, addr, len))
- goto search;
+#ifdef CONFIG_PPC_64K_PAGES
+ /* If we support combo pages, we can allow 64k pages in 4k slices */
+ if (psize == MMU_PAGE_64K) {
+ compat_mask = slice_mask_for_size(mm, MMU_PAGE_4K);
+ if (fixed)
+ or_mask(good_mask, compat_mask);
+ }
+#endif
+ /* First check hint if it's valid or if we have MAP_FIXED */
+ if (addr != 0 || fixed) {
/* Build a mask for the requested range */
mask = slice_range_to_mask(addr, len);
slice_print_mask(" mask", mask);
slice_dbg(" fits good !\n");
return addr;
}
-
- /* We don't fit in the good mask, check what other slices are
- * empty and thus can be converted
+ } else {
+ /* Now let's see if we can find something in the existing
+ * slices for that size
*/
- potential_mask = slice_mask_for_free(mm);
- potential_mask.low_slices |= good_mask.low_slices;
- potential_mask.high_slices |= good_mask.high_slices;
- pmask_set = 1;
- slice_print_mask(" potential", potential_mask);
- if (slice_check_fit(mask, potential_mask)) {
- slice_dbg(" fits potential !\n");
- goto convert;
+ newaddr = slice_find_area(mm, len, good_mask, psize, topdown,
+ use_cache);
+ if (newaddr != -ENOMEM) {
+ /* Found within the good mask, we don't have to setup,
+ * we thus return directly
+ */
+ slice_dbg(" found area at 0x%lx\n", newaddr);
+ return newaddr;
}
}
- /* If we have MAP_FIXED and failed the above step, then error out */
+ /* We don't fit in the good mask, check what other slices are
+ * empty and thus can be converted
+ */
+ potential_mask = slice_mask_for_free(mm);
+ or_mask(potential_mask, good_mask);
+ slice_print_mask(" potential", potential_mask);
+
+ if ((addr != 0 || fixed) && slice_check_fit(mask, potential_mask)) {
+ slice_dbg(" fits potential !\n");
+ goto convert;
+ }
+
+ /* If we have MAP_FIXED and failed the above steps, then error out */
if (fixed)
return -EBUSY;
- search:
slice_dbg(" search...\n");
- /* Now let's see if we can find something in the existing slices
- * for that size
+ /* If we had a hint that didn't work out, see if we can fit
+ * anywhere in the good area.
*/
- addr = slice_find_area(mm, len, good_mask, psize, topdown, use_cache);
- if (addr != -ENOMEM) {
- /* Found within the good mask, we don't have to setup,
- * we thus return directly
- */
- slice_dbg(" found area at 0x%lx\n", addr);
- return addr;
- }
-
- /* Won't fit, check what can be converted */
- if (!pmask_set) {
- potential_mask = slice_mask_for_free(mm);
- potential_mask.low_slices |= good_mask.low_slices;
- potential_mask.high_slices |= good_mask.high_slices;
- pmask_set = 1;
- slice_print_mask(" potential", potential_mask);
+ if (addr) {
+ addr = slice_find_area(mm, len, good_mask, psize, topdown,
+ use_cache);
+ if (addr != -ENOMEM) {
+ slice_dbg(" found area at 0x%lx\n", addr);
+ return addr;
+ }
}
/* Now let's see if we can find something in the existing slices
- * for that size
+ * for that size plus free slices
*/
addr = slice_find_area(mm, len, potential_mask, psize, topdown,
use_cache);
+
+#ifdef CONFIG_PPC_64K_PAGES
+ if (addr == -ENOMEM && psize == MMU_PAGE_64K) {
+ /* retry the search with 4k-page slices included */
+ or_mask(potential_mask, compat_mask);
+ addr = slice_find_area(mm, len, potential_mask, psize,
+ topdown, use_cache);
+ }
+#endif
+
if (addr == -ENOMEM)
return -ENOMEM;
slice_print_mask(" mask", mask);
convert:
- slice_convert(mm, mask, psize);
+ andnot_mask(mask, good_mask);
+ andnot_mask(mask, compat_mask);
+ if (mask.low_slices || mask.high_slices) {
+ slice_convert(mm, mask, psize);
+ if (psize > MMU_PAGE_BASE)
+ on_each_cpu(slice_flush_segments, mm, 0, 1);
+ }
return addr;
}
spin_unlock_irqrestore(&slice_convert_lock, flags);
}
+void slice_set_psize(struct mm_struct *mm, unsigned long address,
+ unsigned int psize)
+{
+ unsigned long i, flags;
+ u64 *p;
+
+ spin_lock_irqsave(&slice_convert_lock, flags);
+ if (address < SLICE_LOW_TOP) {
+ i = GET_LOW_SLICE_INDEX(address);
+ p = &mm->context.low_slices_psize;
+ } else {
+ i = GET_HIGH_SLICE_INDEX(address);
+ p = &mm->context.high_slices_psize;
+ }
+ *p = (*p & ~(0xful << (i * 4))) | ((unsigned long) psize << (i * 4));
+ spin_unlock_irqrestore(&slice_convert_lock, flags);
+
+#ifdef CONFIG_SPU_BASE
+ spu_flush_all_slbs(mm);
+#endif
+}
+
+void slice_set_range_psize(struct mm_struct *mm, unsigned long start,
+ unsigned long len, unsigned int psize)
+{
+ struct slice_mask mask = slice_range_to_mask(start, len);
+
+ slice_convert(mm, mask, psize);
+}
+
/*
* is_hugepage_only_range() is used by generic code to verify wether
* a normal mmap mapping (non hugetlbfs) is valid on a given area.
projects / linux-2.6 / commitdiff