3  *  Page table allocation functions
54 void crst_table_free(struct mm_struct *mm, unsigned long *table)  in crst_table_free()  argument
56 	if (!table)  in crst_table_free()
58 	pagetable_free(virt_to_ptdesc(table));  in crst_table_free()
146 	u64 *table;  in page_table_alloc_pgste()  local
150 		table = (u64 *)ptdesc_to_virt(ptdesc);  in page_table_alloc_pgste()
151 		arch_set_page_dat(virt_to_page(table), 0);  in page_table_alloc_pgste()
152 		memset64(table, _PAGE_INVALID, PTRS_PER_PTE);  in page_table_alloc_pgste()
153 		memset64(table + PTRS_PER_PTE, 0, PTRS_PER_PTE);  in page_table_alloc_pgste()
247 	unsigned long *table;  in page_table_alloc()  local
251 	/* Try to get a fragment of a 4K page as a 2K page table */  in page_table_alloc()
253 		table = NULL;  in page_table_alloc()
270 				table = (unsigned long *) ptdesc_to_virt(ptdesc);  in page_table_alloc()
273 					table += PTRS_PER_PTE;  in page_table_alloc()
280 		if (table)  in page_table_alloc()
281 			return table;  in page_table_alloc()
292 	/* Initialize page table */  in page_table_alloc()
293 	table = (unsigned long *) ptdesc_to_virt(ptdesc);  in page_table_alloc()
295 		/* Return 4K page table with PGSTEs */  in page_table_alloc()
298 		memset64((u64 *)table, _PAGE_INVALID, PTRS_PER_PTE);  in page_table_alloc()
299 		memset64((u64 *)table + PTRS_PER_PTE, 0, PTRS_PER_PTE);  in page_table_alloc()
303 		memset64((u64 *)table, _PAGE_INVALID, 2 * PTRS_PER_PTE);  in page_table_alloc()
308 	return table;  in page_table_alloc()
311 static void page_table_release_check(struct page *page, void *table,  in page_table_release_check()  argument
322 		 table, half, mask);  in page_table_release_check()
335 void page_table_free(struct mm_struct *mm, unsigned long *table)  in page_table_free()  argument
338 	struct ptdesc *ptdesc = virt_to_ptdesc(table);  in page_table_free()
341 		/* Free 2K page table fragment of a 4K page */  in page_table_free()
342 		bit = ((unsigned long) table & ~PAGE_MASK)/(PTRS_PER_PTE*sizeof(pte_t));  in page_table_free()
374 	page_table_release_check(ptdesc_page(ptdesc), table, half, mask);  in page_table_free()
381 void page_table_free_rcu(struct mmu_gather *tlb, unsigned long *table,  in page_table_free_rcu()  argument
386 	struct ptdesc *ptdesc = virt_to_ptdesc(table);  in page_table_free_rcu()
390 		gmap_unlink(mm, table, vmaddr);  in page_table_free_rcu()
391 		table = (unsigned long *) ((unsigned long)table | 0x03U);  in page_table_free_rcu()
392 		tlb_remove_ptdesc(tlb, table);  in page_table_free_rcu()
395 	bit = ((unsigned long) table & ~PAGE_MASK) / (PTRS_PER_PTE*sizeof(pte_t));  in page_table_free_rcu()
417 	table = (unsigned long *) ((unsigned long) table | (0x01U << bit));  in page_table_free_rcu()
418 	tlb_remove_table(tlb, table);  in page_table_free_rcu()
424 	void *table = (void *)((unsigned long) _table ^ mask);  in __tlb_remove_table()  local
425 	struct ptdesc *ptdesc = virt_to_ptdesc(table);  in __tlb_remove_table()
431 	case 0x01U:	/* lower 2K of a 4K page table */  in __tlb_remove_table()
432 	case 0x02U:	/* higher 2K of a 4K page table */  in __tlb_remove_table()
438 	case 0x03U:	/* 4K page table with pgstes */  in __tlb_remove_table()
444 	page_table_release_check(ptdesc_page(ptdesc), table, half, mask);  in __tlb_remove_table()
476 	unsigned long *table;  in base_pgt_alloc()  local
478 	table = kmem_cache_alloc(base_pgt_cache, GFP_KERNEL);  in base_pgt_alloc()
479 	if (table)  in base_pgt_alloc()
480 		memset64((u64 *)table, _PAGE_INVALID, PTRS_PER_PTE);  in base_pgt_alloc()
481 	return table;  in base_pgt_alloc()
484 static void base_pgt_free(unsigned long *table)  in base_pgt_free()  argument
486 	kmem_cache_free(base_pgt_cache, table);  in base_pgt_free()
491 	unsigned long *table;  in base_crst_alloc()  local
497 	table = ptdesc_address(ptdesc);  in base_crst_alloc()
499 	crst_table_init(table, val);  in base_crst_alloc()
500 	return table;  in base_crst_alloc()
503 static void base_crst_free(unsigned long *table)  in base_crst_free()  argument
505 	if (!table)  in base_crst_free()
507 	pagetable_free(virt_to_ptdesc(table));  in base_crst_free()
554 	unsigned long *ste, next, *table;  in base_segment_walk()  local
564 			table = base_pgt_alloc();  in base_segment_walk()
565 			if (!table)  in base_segment_walk()
567 			*ste = __pa(table) | _SEGMENT_ENTRY;  in base_segment_walk()
569 		table = __va(*ste & _SEGMENT_ENTRY_ORIGIN);  in base_segment_walk()
570 		rc = base_page_walk(table, addr, next, alloc);  in base_segment_walk()
574 			base_pgt_free(table);  in base_segment_walk()
583 	unsigned long *rtte, next, *table;  in base_region3_walk()  local
593 			table = base_crst_alloc(_SEGMENT_ENTRY_EMPTY);  in base_region3_walk()
594 			if (!table)  in base_region3_walk()
596 			*rtte = __pa(table) | _REGION3_ENTRY;  in base_region3_walk()
598 		table = __va(*rtte & _REGION_ENTRY_ORIGIN);  in base_region3_walk()
599 		rc = base_segment_walk(table, addr, next, alloc);  in base_region3_walk()
603 			base_crst_free(table);  in base_region3_walk()
611 	unsigned long *rste, next, *table;  in base_region2_walk()  local
621 			table = base_crst_alloc(_REGION3_ENTRY_EMPTY);  in base_region2_walk()
622 			if (!table)  in base_region2_walk()
624 			*rste = __pa(table) | _REGION2_ENTRY;  in base_region2_walk()
626 		table = __va(*rste & _REGION_ENTRY_ORIGIN);  in base_region2_walk()
627 		rc = base_region3_walk(table, addr, next, alloc);  in base_region2_walk()
631 			base_crst_free(table);  in base_region2_walk()
639 	unsigned long *rfte, next, *table;  in base_region1_walk()  local
649 			table = base_crst_alloc(_REGION2_ENTRY_EMPTY);  in base_region1_walk()
650 			if (!table)  in base_region1_walk()
652 			*rfte = __pa(table) | _REGION1_ENTRY;  in base_region1_walk()
654 		table = __va(*rfte & _REGION_ENTRY_ORIGIN);  in base_region1_walk()
655 		rc = base_region2_walk(table, addr, next, alloc);  in base_region1_walk()
659 			base_crst_free(table);  in base_region1_walk()
673 	unsigned long *table = __va(asce & _ASCE_ORIGIN);  in base_asce_free()  local
679 		base_segment_walk(table, 0, _REGION3_SIZE, 0);  in base_asce_free()
682 		base_region3_walk(table, 0, _REGION2_SIZE, 0);  in base_asce_free()
685 		base_region2_walk(table, 0, _REGION1_SIZE, 0);  in base_asce_free()
688 		base_region1_walk(table, 0, TASK_SIZE_MAX, 0);  in base_asce_free()
691 	base_crst_free(table);  in base_asce_free()
725 	unsigned long asce, *table, end;  in base_asce_alloc()  local
732 		table = base_crst_alloc(_SEGMENT_ENTRY_EMPTY);  in base_asce_alloc()
733 		if (!table)  in base_asce_alloc()
735 		rc = base_segment_walk(table, addr, end, 1);  in base_asce_alloc()
736 		asce = __pa(table) | _ASCE_TYPE_SEGMENT | _ASCE_TABLE_LENGTH;  in base_asce_alloc()
738 		table = base_crst_alloc(_REGION3_ENTRY_EMPTY);  in base_asce_alloc()
739 		if (!table)  in base_asce_alloc()
741 		rc = base_region3_walk(table, addr, end, 1);  in base_asce_alloc()
742 		asce = __pa(table) | _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;  in base_asce_alloc()
744 		table = base_crst_alloc(_REGION2_ENTRY_EMPTY);  in base_asce_alloc()
745 		if (!table)  in base_asce_alloc()
747 		rc = base_region2_walk(table, addr, end, 1);  in base_asce_alloc()
748 		asce = __pa(table) | _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH;  in base_asce_alloc()
750 		table = base_crst_alloc(_REGION1_ENTRY_EMPTY);  in base_asce_alloc()
751 		if (!table)  in base_asce_alloc()
753 		rc = base_region1_walk(table, addr, end, 1);  in base_asce_alloc()
754 		asce = __pa(table) | _ASCE_TYPE_REGION1 | _ASCE_TABLE_LENGTH;  in base_asce_alloc()