提交 5ed7ecd0 编写于 作者: A Aneesh Kumar K.V 提交者: Michael Ellerman

powerpc/mm: pte_frag abstraction

In this patch we make the number of pte fragments per level 4 page table
page a variable. Radix level 4 table size is 256 bytes and hence we can
have 256 fragments per level 4 page. We don't update the fragment count
in this patch. We need to do performance measurements to find the right
value for fragment count.
Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
上级 a3dece6d
......@@ -28,6 +28,8 @@
#define H_PAGE_4K_PFN 0x0
#define H_PAGE_THP_HUGE 0x0
#define H_PAGE_COMBO 0x0
#define H_PTE_FRAG_NR 0
#define H_PTE_FRAG_SIZE_SHIFT 0
/*
* On all 4K setups, remap_4k_pfn() equates to remap_pfn_range()
*/
......
......@@ -29,12 +29,12 @@
/*
* we support 16 fragments per PTE page of 64K size.
*/
#define PTE_FRAG_NR 16
#define H_PTE_FRAG_NR 16
/*
* We use a 2K PTE page fragment and another 2K for storing
* real_pte_t hash index
*/
#define PTE_FRAG_SIZE_SHIFT 12
#define H_PTE_FRAG_SIZE_SHIFT 12
#define PTE_FRAG_SIZE (1UL << PTE_FRAG_SIZE_SHIFT)
#ifndef __ASSEMBLY__
......
......@@ -177,6 +177,12 @@ extern unsigned long __pgd_val_bits;
#define PMD_VAL_BITS __pmd_val_bits
#define PUD_VAL_BITS __pud_val_bits
#define PGD_VAL_BITS __pgd_val_bits
extern unsigned long __pte_frag_nr;
#define PTE_FRAG_NR __pte_frag_nr
extern unsigned long __pte_frag_size_shift;
#define PTE_FRAG_SIZE_SHIFT __pte_frag_size_shift
#define PTE_FRAG_SIZE (1UL << PTE_FRAG_SIZE_SHIFT)
/*
* Pgtable size used by swapper, init in asm code
*/
......
......@@ -873,6 +873,9 @@ void __init hash__early_init_mmu(void)
/*
* initialize page table size
*/
__pte_frag_nr = H_PTE_FRAG_NR;
__pte_frag_size_shift = H_PTE_FRAG_SIZE_SHIFT;
__pte_index_size = H_PTE_INDEX_SIZE;
__pmd_index_size = H_PMD_INDEX_SIZE;
__pud_index_size = H_PUD_INDEX_SIZE;
......
......@@ -334,6 +334,11 @@ void __init radix__early_init_mmu(void)
__vmalloc_end = RADIX_VMALLOC_END;
vmemmap = (struct page *)RADIX_VMEMMAP_BASE;
ioremap_bot = IOREMAP_BASE;
/*
* For now radix also use the same frag size
*/
__pte_frag_nr = H_PTE_FRAG_NR;
__pte_frag_size_shift = H_PTE_FRAG_SIZE_SHIFT;
radix_init_page_sizes();
if (!firmware_has_feature(FW_FEATURE_LPAR))
......
......@@ -107,6 +107,10 @@ unsigned long __vmalloc_end;
EXPORT_SYMBOL(__vmalloc_end);
struct page *vmemmap;
EXPORT_SYMBOL(vmemmap);
unsigned long __pte_frag_nr;
EXPORT_SYMBOL(__pte_frag_nr);
unsigned long __pte_frag_size_shift;
EXPORT_SYMBOL(__pte_frag_size_shift);
unsigned long ioremap_bot;
#else /* !CONFIG_PPC_BOOK3S_64 */
unsigned long ioremap_bot = IOREMAP_BASE;
......
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