Commit dcd1912d authored by Nitin Gupta's avatar Nitin Gupta Committed by David S. Miller
Browse files

sparc64: Add 64K page size support



This patch depends on:
[v6] sparc64: Multi-page size support

- Testing

Tested on Sonoma by running stream benchmark instance which allocated
48G worth of 64K pages.

boot params: default_hugepagesz=64K hugepagesz=64K hugepages=1310720

Signed-off-by: default avatarNitin Gupta <nitin.m.gupta@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c7d9f77d
......@@ -18,6 +18,7 @@
#define HPAGE_SHIFT 23
#define REAL_HPAGE_SHIFT 22
#define HPAGE_256MB_SHIFT 28
#define HPAGE_64K_SHIFT 16
#define REAL_HPAGE_SIZE (_AC(1,UL) << REAL_HPAGE_SHIFT)
#if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE)
......@@ -26,7 +27,7 @@
#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
#define REAL_HPAGE_PER_HPAGE (_AC(1,UL) << (HPAGE_SHIFT - REAL_HPAGE_SHIFT))
#define HUGE_MAX_HSTATE 2
#define HUGE_MAX_HSTATE 3
#endif
#ifndef __ASSEMBLY__
......
......@@ -149,6 +149,9 @@ static pte_t sun4v_hugepage_shift_to_tte(pte_t entry, unsigned int shift)
case HPAGE_SHIFT:
pte_val(entry) |= _PAGE_PMD_HUGE;
break;
case HPAGE_64K_SHIFT:
hugepage_size = _PAGE_SZ64K_4V;
break;
default:
WARN_ONCE(1, "unsupported hugepage shift=%u\n", shift);
}
......@@ -185,6 +188,9 @@ static unsigned int sun4v_huge_tte_to_shift(pte_t entry)
case _PAGE_SZ4MB_4V:
shift = REAL_HPAGE_SHIFT;
break;
case _PAGE_SZ64K_4V:
shift = HPAGE_64K_SHIFT;
break;
default:
shift = PAGE_SHIFT;
break;
......@@ -204,6 +210,9 @@ static unsigned int sun4u_huge_tte_to_shift(pte_t entry)
case _PAGE_SZ4MB_4U:
shift = REAL_HPAGE_SHIFT;
break;
case _PAGE_SZ64K_4U:
shift = HPAGE_64K_SHIFT;
break;
default:
shift = PAGE_SHIFT;
break;
......@@ -241,12 +250,21 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte = NULL;
pgd = pgd_offset(mm, addr);
pud = pud_alloc(mm, pgd, addr);
if (pud)
pte = (pte_t *)pmd_alloc(mm, pud, addr);
if (pud) {
pmd = pmd_alloc(mm, pud, addr);
if (!pmd)
return NULL;
if (sz == PMD_SHIFT)
pte = (pte_t *)pmd;
else
pte = pte_alloc_map(mm, pmd, addr);
}
return pte;
}
......@@ -255,42 +273,52 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte = NULL;
pgd = pgd_offset(mm, addr);
if (!pgd_none(*pgd)) {
pud = pud_offset(pgd, addr);
if (!pud_none(*pud))
pte = (pte_t *)pmd_offset(pud, addr);
if (!pud_none(*pud)) {
pmd = pmd_offset(pud, addr);
if (!pmd_none(*pmd)) {
if (is_hugetlb_pmd(*pmd))
pte = (pte_t *)pmd;
else
pte = pte_offset_map(pmd, addr);
}
}
}
return pte;
}
void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t entry)
{
unsigned int i, nptes, hugepage_shift;
unsigned int i, nptes, orig_shift, shift;
unsigned long size;
pte_t orig;
size = huge_tte_to_size(entry);
nptes = size >> PMD_SHIFT;
shift = size >= HPAGE_SIZE ? PMD_SHIFT : PAGE_SHIFT;
nptes = size >> shift;
if (!pte_present(*ptep) && pte_present(entry))
mm->context.hugetlb_pte_count += nptes;
addr &= ~(size - 1);
orig = *ptep;
hugepage_shift = pte_none(orig) ? PAGE_SIZE : huge_tte_to_shift(orig);
orig_shift = pte_none(orig) ? PAGE_SIZE : huge_tte_to_shift(orig);
for (i = 0; i < nptes; i++)
ptep[i] = __pte(pte_val(entry) + (i << PMD_SHIFT));
ptep[i] = __pte(pte_val(entry) + (i << shift));
maybe_tlb_batch_add(mm, addr, ptep, orig, 0, hugepage_shift);
maybe_tlb_batch_add(mm, addr, ptep, orig, 0, orig_shift);
/* An HPAGE_SIZE'ed page is composed of two REAL_HPAGE_SIZE'ed pages */
if (size == HPAGE_SIZE)
maybe_tlb_batch_add(mm, addr + REAL_HPAGE_SIZE, ptep, orig, 0,
hugepage_shift);
orig_shift);
}
pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
......@@ -302,7 +330,11 @@ pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
entry = *ptep;
size = huge_tte_to_size(entry);
nptes = size >> PMD_SHIFT;
if (size >= HPAGE_SIZE)
nptes = size >> PMD_SHIFT;
else
nptes = size >> PAGE_SHIFT;
hugepage_shift = pte_none(entry) ? PAGE_SIZE : huge_tte_to_shift(entry);
if (pte_present(entry))
......
......@@ -345,6 +345,10 @@ static int __init setup_hugepagesz(char *string)
hv_pgsz_mask = HV_PGSZ_MASK_4MB;
hv_pgsz_idx = HV_PGSZ_IDX_4MB;
break;
case HPAGE_64K_SHIFT:
hv_pgsz_mask = HV_PGSZ_MASK_64K;
hv_pgsz_idx = HV_PGSZ_IDX_64K;
break;
default:
hv_pgsz_mask = 0;
}
......
......@@ -147,12 +147,13 @@ void flush_tsb_user_page(struct mm_struct *mm, unsigned long vaddr,
spin_lock_irqsave(&mm->context.lock, flags);
if (hugepage_shift == PAGE_SHIFT) {
if (hugepage_shift < HPAGE_SHIFT) {
base = (unsigned long) mm->context.tsb_block[MM_TSB_BASE].tsb;
nentries = mm->context.tsb_block[MM_TSB_BASE].tsb_nentries;
if (tlb_type == cheetah_plus || tlb_type == hypervisor)
base = __pa(base);
__flush_tsb_one_entry(base, vaddr, PAGE_SHIFT, nentries);
__flush_huge_tsb_one_entry(base, vaddr, PAGE_SHIFT, nentries,
hugepage_shift);
}
#if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE)
else if (mm->context.tsb_block[MM_TSB_HUGE].tsb) {
......
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