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powerpc/mm/book3s64/4k: Switch 4k pagesize config to use pagetable fragment

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4K config use one full page at level 4 of the pagetable. Add support for single
fragment allocation in pagetable fragment code and and use that for 4K config.
This makes both 4k and 64k use the same code path. Later we will switch pmd to
use the page table fragment code. This is done only for 64bit platforms which
is using page table fragment support.

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 16:57:20 +05:30
committed by Michael Ellerman
parent 702346768c
commit 1c7ec8a40a
5 changed files with 15 additions and 44 deletions
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10
arch/powerpc/mm/mmu_context_book3s64.c
View File

@@ -159,9 +159,7 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
mm->context.id = index;
#ifdef CONFIG_PPC_64K_PAGES
mm->context.pte_frag = NULL;
#endif
#ifdef CONFIG_SPAPR_TCE_IOMMU
mm_iommu_init(mm);
#endif
@@ -192,7 +190,6 @@ static void destroy_contexts(mm_context_t *ctx)
spin_unlock(&mmu_context_lock);
}
#ifdef CONFIG_PPC_64K_PAGES
static void destroy_pagetable_page(struct mm_struct *mm)
{
int count;
@@ -213,13 +210,6 @@ static void destroy_pagetable_page(struct mm_struct *mm)
}
}
#else
static inline void destroy_pagetable_page(struct mm_struct *mm)
{
return;
}
#endif
void destroy_context(struct mm_struct *mm)
{
#ifdef CONFIG_SPAPR_TCE_IOMMU

11
arch/powerpc/mm/pgtable-book3s64.c
View File

@@ -225,7 +225,7 @@ void mmu_partition_table_set_entry(unsigned int lpid, unsigned long dw0,
asm volatile("eieio; tlbsync; ptesync" : : : "memory");
}
EXPORT_SYMBOL_GPL(mmu_partition_table_set_entry);
#ifdef CONFIG_PPC_64K_PAGES
static pte_t *get_pte_from_cache(struct mm_struct *mm)
{
void *pte_frag, *ret;
@@ -264,7 +264,14 @@ static pte_t *__alloc_for_ptecache(struct mm_struct *mm, int kernel)
return NULL;
}
ret = page_address(page);
/*
* if we support only one fragment just return the
* allocated page.
*/
if (PTE_FRAG_NR == 1)
return ret;
spin_lock(&mm->page_table_lock);
/*
* If we find pgtable_page set, we return
@@ -291,8 +298,6 @@ pte_t *pte_fragment_alloc(struct mm_struct *mm, unsigned long vmaddr, int kernel
return __alloc_for_ptecache(mm, kernel);
}
#endif /* CONFIG_PPC_64K_PAGES */
void pte_fragment_free(unsigned long *table, int kernel)
{
struct page *page = virt_to_page(table);