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powerpc/8xx: Enable 512k hugepage support with HW assistance

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For using 512k pages with hardware assistance, the PTEs have to be spread
every 128 bytes in the L2 table.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy 2018-11-29 14:07:19 +00:00 committed by Michael Ellerman
parent 22569b881d
commit 3fb69c6a1a
3 changed files with 15 additions and 2 deletions
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4
arch/powerpc/include/asm/hugetlb.h
View File

@ -74,7 +74,9 @@ static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
unsigned long idx = 0;
pte_t *dir = hugepd_page(hpd);
#ifndef CONFIG_PPC_FSL_BOOK3E
#ifdef CONFIG_PPC_8xx
idx = (addr & ((1UL << pdshift) - 1)) >> PAGE_SHIFT;
#elif !defined(CONFIG_PPC_FSL_BOOK3E)
idx = (addr & ((1UL << pdshift) - 1)) >> hugepd_shift(hpd);
#endif

10
arch/powerpc/mm/hugetlbpage.c
View File

@ -65,6 +65,9 @@ static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp,
if (pshift >= pdshift) {
cachep = PGT_CACHE(PTE_T_ORDER);
num_hugepd = 1 << (pshift - pdshift);
} else if (IS_ENABLED(CONFIG_PPC_8xx)) {
cachep = PGT_CACHE(PTE_INDEX_SIZE);
num_hugepd = 1;
} else {
cachep = PGT_CACHE(pdshift - pshift);
num_hugepd = 1;
@ -331,6 +334,9 @@ static void free_hugepd_range(struct mmu_gather *tlb, hugepd_t *hpdp, int pdshif
if (shift >= pdshift)
hugepd_free(tlb, hugepte);
else if (IS_ENABLED(CONFIG_PPC_8xx))
pgtable_free_tlb(tlb, hugepte,
get_hugepd_cache_index(PTE_INDEX_SIZE));
else
pgtable_free_tlb(tlb, hugepte,
get_hugepd_cache_index(pdshift - shift));
@ -700,7 +706,9 @@ static int __init hugetlbpage_init(void)
* if we have pdshift and shift value same, we don't
* use pgt cache for hugepd.
*/
if (pdshift > shift)
if (pdshift > shift && IS_ENABLED(CONFIG_PPC_8xx))
pgtable_cache_add(PTE_INDEX_SIZE);
else if (pdshift > shift)
pgtable_cache_add(pdshift - shift);
#if defined(CONFIG_PPC_FSL_BOOK3E) || defined(CONFIG_PPC_8xx)
else

3
arch/powerpc/mm/tlb_nohash.c
View File

@ -97,6 +97,9 @@ struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT] = {
.shift = 14,
},
#endif
[MMU_PAGE_512K] = {
.shift = 19,
},
[MMU_PAGE_8M] = {
.shift = 23,
},