3  *  Page table allocation functions
64 void crst_table_free(struct mm_struct *mm, unsigned long *table)  in crst_table_free()  argument
66 	free_pages((unsigned long) table, 2);  in crst_table_free()
80 	unsigned long *table, *pgd;  in crst_table_upgrade()  local
88 		table = crst_table_alloc(mm);  in crst_table_upgrade()
89 		if (!table) {  in crst_table_upgrade()
96 			crst_table_init(table, _REGION2_ENTRY_EMPTY);  in crst_table_upgrade()
97 			p4d_populate(mm, (p4d_t *) table, (pud_t *) pgd);  in crst_table_upgrade()
98 			mm->pgd = (pgd_t *) table;  in crst_table_upgrade()
104 			crst_table_init(table, _REGION1_ENTRY_EMPTY);  in crst_table_upgrade()
105 			pgd_populate(mm, (pgd_t *) table, (p4d_t *) pgd);  in crst_table_upgrade()
106 			mm->pgd = (pgd_t *) table;  in crst_table_upgrade()
159 	u64 *table;  in page_table_alloc_pgste()  local
163 		table = (u64 *)page_to_phys(page);  in page_table_alloc_pgste()
164 		memset64(table, _PAGE_INVALID, PTRS_PER_PTE);  in page_table_alloc_pgste()
165 		memset64(table + PTRS_PER_PTE, 0, PTRS_PER_PTE);  in page_table_alloc_pgste()
178  * page table entry allocation/free routines.
182 	unsigned long *table;  in page_table_alloc()  local
186 	/* Try to get a fragment of a 4K page as a 2K page table */  in page_table_alloc()
188 		table = NULL;  in page_table_alloc()
196 				table = (unsigned long *) page_to_phys(page);  in page_table_alloc()
199 					table += PTRS_PER_PTE;  in page_table_alloc()
206 		if (table)  in page_table_alloc()
207 			return table;  in page_table_alloc()
218 	/* Initialize page table */  in page_table_alloc()
219 	table = (unsigned long *) page_to_phys(page);  in page_table_alloc()
221 		/* Return 4K page table with PGSTEs */  in page_table_alloc()
223 		memset64((u64 *)table, _PAGE_INVALID, PTRS_PER_PTE);  in page_table_alloc()
224 		memset64((u64 *)table + PTRS_PER_PTE, 0, PTRS_PER_PTE);  in page_table_alloc()
228 		memset64((u64 *)table, _PAGE_INVALID, 2 * PTRS_PER_PTE);  in page_table_alloc()
233 	return table;  in page_table_alloc()
236 void page_table_free(struct mm_struct *mm, unsigned long *table)  in page_table_free()  argument
241 	page = pfn_to_page(__pa(table) >> PAGE_SHIFT);  in page_table_free()
243 		/* Free 2K page table fragment of a 4K page */  in page_table_free()
244 		bit = (__pa(table) & ~PAGE_MASK)/(PTRS_PER_PTE*sizeof(pte_t));  in page_table_free()
263 void page_table_free_rcu(struct mmu_gather *tlb, unsigned long *table,  in page_table_free_rcu()  argument
271 	page = pfn_to_page(__pa(table) >> PAGE_SHIFT);  in page_table_free_rcu()
273 		gmap_unlink(mm, table, vmaddr);  in page_table_free_rcu()
274 		table = (unsigned long *) (__pa(table) | 3);  in page_table_free_rcu()
275 		tlb_remove_table(tlb, table);  in page_table_free_rcu()
278 	bit = (__pa(table) & ~PAGE_MASK) / (PTRS_PER_PTE*sizeof(pte_t));  in page_table_free_rcu()
287 	table = (unsigned long *) (__pa(table) | (1U << bit));  in page_table_free_rcu()
288 	tlb_remove_table(tlb, table);  in page_table_free_rcu()
294 	void *table = (void *)((unsigned long) _table ^ mask);  in __tlb_remove_table()  local
295 	struct page *page = pfn_to_page(__pa(table) >> PAGE_SHIFT);  in __tlb_remove_table()
299 		free_pages((unsigned long) table, 2);  in __tlb_remove_table()
301 	case 1:		/* lower 2K of a 4K page table */  in __tlb_remove_table()
302 	case 2:		/* higher 2K of a 4K page table */  in __tlb_remove_table()
308 	case 3:		/* 4K page table with pgstes */  in __tlb_remove_table()
326 	u64 *table;  in base_pgt_alloc()  local
328 	table = kmem_cache_alloc(base_pgt_cache, GFP_KERNEL);  in base_pgt_alloc()
329 	if (table)  in base_pgt_alloc()
330 		memset64(table, _PAGE_INVALID, PTRS_PER_PTE);  in base_pgt_alloc()
331 	return (unsigned long) table;  in base_pgt_alloc()
334 static void base_pgt_free(unsigned long table)  in base_pgt_free()  argument
336 	kmem_cache_free(base_pgt_cache, (void *) table);  in base_pgt_free()
341 	unsigned long table;  in base_crst_alloc()  local
343 	table =	 __get_free_pages(GFP_KERNEL, CRST_ALLOC_ORDER);  in base_crst_alloc()
344 	if (table)  in base_crst_alloc()
345 		crst_table_init((unsigned long *)table, val);  in base_crst_alloc()
346 	return table;  in base_crst_alloc()
349 static void base_crst_free(unsigned long table)  in base_crst_free()  argument
351 	free_pages(table, CRST_ALLOC_ORDER);  in base_crst_free()
398 	unsigned long *ste, next, table;  in base_segment_walk()  local
408 			table = base_pgt_alloc();  in base_segment_walk()
409 			if (!table)  in base_segment_walk()
411 			*ste = table | _SEGMENT_ENTRY;  in base_segment_walk()
413 		table = *ste & _SEGMENT_ENTRY_ORIGIN;  in base_segment_walk()
414 		rc = base_page_walk(table, addr, next, alloc);  in base_segment_walk()
418 			base_pgt_free(table);  in base_segment_walk()
427 	unsigned long *rtte, next, table;  in base_region3_walk()  local
437 			table = base_crst_alloc(_SEGMENT_ENTRY_EMPTY);  in base_region3_walk()
438 			if (!table)  in base_region3_walk()
440 			*rtte = table | _REGION3_ENTRY;  in base_region3_walk()
442 		table = *rtte & _REGION_ENTRY_ORIGIN;  in base_region3_walk()
443 		rc = base_segment_walk(table, addr, next, alloc);  in base_region3_walk()
447 			base_crst_free(table);  in base_region3_walk()
455 	unsigned long *rste, next, table;  in base_region2_walk()  local
465 			table = base_crst_alloc(_REGION3_ENTRY_EMPTY);  in base_region2_walk()
466 			if (!table)  in base_region2_walk()
468 			*rste = table | _REGION2_ENTRY;  in base_region2_walk()
470 		table = *rste & _REGION_ENTRY_ORIGIN;  in base_region2_walk()
471 		rc = base_region3_walk(table, addr, next, alloc);  in base_region2_walk()
475 			base_crst_free(table);  in base_region2_walk()
483 	unsigned long *rfte, next, table;  in base_region1_walk()  local
493 			table = base_crst_alloc(_REGION2_ENTRY_EMPTY);  in base_region1_walk()
494 			if (!table)  in base_region1_walk()
496 			*rfte = table | _REGION1_ENTRY;  in base_region1_walk()
498 		table = *rfte & _REGION_ENTRY_ORIGIN;  in base_region1_walk()
499 		rc = base_region2_walk(table, addr, next, alloc);  in base_region1_walk()
503 			base_crst_free(table);  in base_region1_walk()
517 	unsigned long table = asce & _ASCE_ORIGIN;  in base_asce_free()  local
523 		base_segment_walk(table, 0, _REGION3_SIZE, 0);  in base_asce_free()
526 		base_region3_walk(table, 0, _REGION2_SIZE, 0);  in base_asce_free()
529 		base_region2_walk(table, 0, _REGION1_SIZE, 0);  in base_asce_free()
532 		base_region1_walk(table, 0, -_PAGE_SIZE, 0);  in base_asce_free()
535 	base_crst_free(table);  in base_asce_free()
569 	unsigned long asce, table, end;  in base_asce_alloc()  local
576 		table = base_crst_alloc(_SEGMENT_ENTRY_EMPTY);  in base_asce_alloc()
577 		if (!table)  in base_asce_alloc()
579 		rc = base_segment_walk(table, addr, end, 1);  in base_asce_alloc()
580 		asce = table | _ASCE_TYPE_SEGMENT | _ASCE_TABLE_LENGTH;  in base_asce_alloc()
582 		table = base_crst_alloc(_REGION3_ENTRY_EMPTY);  in base_asce_alloc()
583 		if (!table)  in base_asce_alloc()
585 		rc = base_region3_walk(table, addr, end, 1);  in base_asce_alloc()
586 		asce = table | _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;  in base_asce_alloc()
588 		table = base_crst_alloc(_REGION2_ENTRY_EMPTY);  in base_asce_alloc()
589 		if (!table)  in base_asce_alloc()
591 		rc = base_region2_walk(table, addr, end, 1);  in base_asce_alloc()
592 		asce = table | _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH;  in base_asce_alloc()
594 		table = base_crst_alloc(_REGION1_ENTRY_EMPTY);  in base_asce_alloc()
595 		if (!table)  in base_asce_alloc()
597 		rc = base_region1_walk(table, addr, end, 1);  in base_asce_alloc()
598 		asce = table | _ASCE_TYPE_REGION1 | _ASCE_TABLE_LENGTH;  in base_asce_alloc()