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powerpc/mm: Implement helpers for pagetable fragment support at PMD level

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Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V
2018-04-16 16:57:22 +05:30
committed by Michael Ellerman
parent 0c4d268029
commit 8a6c697b99
11 changed files with 144 additions and 6 deletions
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37
arch/powerpc/mm/mmu_context_book3s64.c
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@@ -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