diff options
| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2018-04-16 16:57:22 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-05-15 22:29:12 +1000 |
| commit | 8a6c697b993974eeb05f540fb0ff2515346dbefd (patch) | |
| tree | 9f8c94b01635fa078410af3994c03855f9cb62a9 /arch/powerpc/mm/mmu_context_book3s64.c | |
| parent | 0c4d268029bf3ca78a57d934bdeb43bfdfd4790e (diff) | |
powerpc/mm: Implement helpers for pagetable fragment support at PMD level
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/mmu_context_book3s64.c')
| -rw-r--r-- | arch/powerpc/mm/mmu_context_book3s64.c | 37 |
1 files changed, 31 insertions, 6 deletions
diff --git a/arch/powerpc/mm/mmu_context_book3s64.c b/arch/powerpc/mm/mmu_context_book3s64.c index 87ee78973a35..f3d4b4a0e561 100644 --- a/arch/powerpc/mm/mmu_context_book3s64.c +++ b/arch/powerpc/mm/mmu_context_book3s64.c @@ -160,6 +160,7 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm) mm->context.id = index; mm->context.pte_frag = NULL; + mm->context.pmd_frag = NULL; #ifdef CONFIG_SPAPR_TCE_IOMMU mm_iommu_init(mm); #endif @@ -190,16 +191,11 @@ static void destroy_contexts(mm_context_t *ctx) spin_unlock(&mmu_context_lock); } -static void destroy_pagetable_page(struct mm_struct *mm) +static void pte_frag_destroy(void *pte_frag) { int count; - void *pte_frag; struct page *page; - pte_frag = mm->context.pte_frag; - if (!pte_frag) - return; - page = virt_to_page(pte_frag); /* drop all the pending references */ count = ((unsigned long)pte_frag & ~PAGE_MASK) >> PTE_FRAG_SIZE_SHIFT; @@ -210,6 +206,35 @@ static void destroy_pagetable_page(struct mm_struct *mm) } } +static void pmd_frag_destroy(void *pmd_frag) +{ + int count; + struct page *page; + + page = virt_to_page(pmd_frag); + /* drop all the pending references */ + count = ((unsigned long)pmd_frag & ~PAGE_MASK) >> PMD_FRAG_SIZE_SHIFT; + /* We allow PTE_FRAG_NR fragments from a PTE page */ + if (page_ref_sub_and_test(page, PMD_FRAG_NR - count)) { + pgtable_pmd_page_dtor(page); + free_unref_page(page); + } +} + +static void destroy_pagetable_page(struct mm_struct *mm) +{ + void *frag; + + frag = mm->context.pte_frag; + if (frag) + pte_frag_destroy(frag); + + frag = mm->context.pmd_frag; + if (frag) + pmd_frag_destroy(frag); + return; +} + void destroy_context(struct mm_struct *mm) { #ifdef CONFIG_SPAPR_TCE_IOMMU |