1 #ifndef _ASM_POWERPC_PTE_WALK_H
2 #define _ASM_POWERPC_PTE_WALK_H
3
4 #include <linux/sched.h>
5
6 /* Don't use this directly */
7 extern pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
8 bool *is_thp, unsigned *hshift);
9
10 static inline pte_t *find_linux_pte(pgd_t *pgdir, unsigned long ea,
11 bool *is_thp, unsigned *hshift)
12 {
13 pte_t *pte;
14
15 VM_WARN(!arch_irqs_disabled(), "%s called with irq enabled\n", __func__);
16 pte = __find_linux_pte(pgdir, ea, is_thp, hshift);
17
18 #if defined(CONFIG_DEBUG_VM) && \
19 !(defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE))
20 /*
21 * We should not find huge page if these configs are not enabled.
22 */
23 if (hshift)
24 WARN_ON(*hshift);
25 #endif
26 return pte;
27 }
28
29 static inline pte_t *find_init_mm_pte(unsigned long ea, unsigned *hshift)
30 {
31 pgd_t *pgdir = init_mm.pgd;
32 return __find_linux_pte(pgdir, ea, NULL, hshift);
33 }
34
35 /*
36 * Convert a kernel vmap virtual address (vmalloc or ioremap space) to a
37 * physical address, without taking locks. This can be used in real-mode.
38 */
39 static inline phys_addr_t ppc_find_vmap_phys(unsigned long addr)
40 {
41 pte_t *ptep;
42 phys_addr_t pa;
43 int hugepage_shift;
44
45 /*
46 * init_mm does not free page tables, and does not do THP. It may
47 * have huge pages from huge vmalloc / ioremap etc.
48 */
49 ptep = find_init_mm_pte(addr, &hugepage_shift);
50 if (WARN_ON(!ptep))
51 return 0;
52
53 pa = PFN_PHYS(pte_pfn(*ptep));
54
55 if (!hugepage_shift)
56 hugepage_shift = PAGE_SHIFT;
57
58 pa |= addr & ((1ul << hugepage_shift) - 1);
59
60 return pa;
61 }
62
63 #endif /* _ASM_POWERPC_PTE_WALK_H */
64
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