1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_BOOK3S_64_HASH_H
3 #define _ASM_POWERPC_BOOK3S_64_HASH_H
4 #ifdef __KERNEL__
5 
6 #include <asm/asm-const.h>
7 
8 /*
9  * Common bits between 4K and 64K pages in a linux-style PTE.
10  * Additional bits may be defined in pgtable-hash64-*.h
11  *
12  */
13 #define H_PTE_NONE_MASK		_PAGE_HPTEFLAGS
14 
15 #ifdef CONFIG_PPC_64K_PAGES
16 #include <asm/book3s/64/hash-64k.h>
17 #else
18 #include <asm/book3s/64/hash-4k.h>
19 #endif
20 
21 /* Bits to set in a PMD/PUD/PGD entry valid bit*/
22 #define HASH_PMD_VAL_BITS		(0x8000000000000000UL)
23 #define HASH_PUD_VAL_BITS		(0x8000000000000000UL)
24 #define HASH_PGD_VAL_BITS		(0x8000000000000000UL)
25 
26 /*
27  * Size of EA range mapped by our pagetables.
28  */
29 #define H_PGTABLE_EADDR_SIZE	(H_PTE_INDEX_SIZE + H_PMD_INDEX_SIZE + \
30 				 H_PUD_INDEX_SIZE + H_PGD_INDEX_SIZE + PAGE_SHIFT)
31 #define H_PGTABLE_RANGE		(ASM_CONST(1) << H_PGTABLE_EADDR_SIZE)
32 /*
33  * Top 2 bits are ignored in page table walk.
34  */
35 #define EA_MASK			(~(0xcUL << 60))
36 
37 /*
38  * We store the slot details in the second half of page table.
39  * Increase the pud level table so that hugetlb ptes can be stored
40  * at pud level.
41  */
42 #if defined(CONFIG_HUGETLB_PAGE) &&  defined(CONFIG_PPC_64K_PAGES)
43 #define H_PUD_CACHE_INDEX	(H_PUD_INDEX_SIZE + 1)
44 #else
45 #define H_PUD_CACHE_INDEX	(H_PUD_INDEX_SIZE)
46 #endif
47 
48 /*
49  * +------------------------------+
50  * |                              |
51  * |                              |
52  * |                              |
53  * +------------------------------+  Kernel virtual map end (0xc00e000000000000)
54  * |                              |
55  * |                              |
56  * |      512TB/16TB of vmemmap   |
57  * |                              |
58  * |                              |
59  * +------------------------------+  Kernel vmemmap  start
60  * |                              |
61  * |      512TB/16TB of IO map    |
62  * |                              |
63  * +------------------------------+  Kernel IO map start
64  * |                              |
65  * |      512TB/16TB of vmap      |
66  * |                              |
67  * +------------------------------+  Kernel virt start (0xc008000000000000)
68  * |                              |
69  * |                              |
70  * |                              |
71  * +------------------------------+  Kernel linear (0xc.....)
72  */
73 
74 #define H_VMALLOC_START		H_KERN_VIRT_START
75 #define H_VMALLOC_SIZE		H_KERN_MAP_SIZE
76 #define H_VMALLOC_END		(H_VMALLOC_START + H_VMALLOC_SIZE)
77 
78 #define H_KERN_IO_START		H_VMALLOC_END
79 #define H_KERN_IO_SIZE		H_KERN_MAP_SIZE
80 #define H_KERN_IO_END		(H_KERN_IO_START + H_KERN_IO_SIZE)
81 
82 #define H_VMEMMAP_START		H_KERN_IO_END
83 #define H_VMEMMAP_SIZE		H_KERN_MAP_SIZE
84 #define H_VMEMMAP_END		(H_VMEMMAP_START + H_VMEMMAP_SIZE)
85 
86 #define NON_LINEAR_REGION_ID(ea)	((((unsigned long)ea - H_KERN_VIRT_START) >> REGION_SHIFT) + 2)
87 
88 /*
89  * Region IDs
90  */
91 #define USER_REGION_ID		0
92 #define LINEAR_MAP_REGION_ID	1
93 #define VMALLOC_REGION_ID	NON_LINEAR_REGION_ID(H_VMALLOC_START)
94 #define IO_REGION_ID		NON_LINEAR_REGION_ID(H_KERN_IO_START)
95 #define VMEMMAP_REGION_ID	NON_LINEAR_REGION_ID(H_VMEMMAP_START)
96 #define INVALID_REGION_ID	(VMEMMAP_REGION_ID + 1)
97 
98 /*
99  * Defines the address of the vmemap area, in its own region on
100  * hash table CPUs.
101  */
102 #ifdef CONFIG_PPC_MM_SLICES
103 #define HAVE_ARCH_UNMAPPED_AREA
104 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
105 #endif /* CONFIG_PPC_MM_SLICES */
106 
107 /* PTEIDX nibble */
108 #define _PTEIDX_SECONDARY	0x8
109 #define _PTEIDX_GROUP_IX	0x7
110 
111 #define H_PMD_BAD_BITS		(PTE_TABLE_SIZE-1)
112 #define H_PUD_BAD_BITS		(PMD_TABLE_SIZE-1)
113 
114 #ifndef __ASSEMBLY__
115 static inline int get_region_id(unsigned long ea)
116 {
117 	int region_id;
118 	int id = (ea >> 60UL);
119 
120 	if (id == 0)
121 		return USER_REGION_ID;
122 
123 	if (id != (PAGE_OFFSET >> 60))
124 		return INVALID_REGION_ID;
125 
126 	if (ea < H_KERN_VIRT_START)
127 		return LINEAR_MAP_REGION_ID;
128 
129 	BUILD_BUG_ON(NON_LINEAR_REGION_ID(H_VMALLOC_START) != 2);
130 
131 	region_id = NON_LINEAR_REGION_ID(ea);
132 	return region_id;
133 }
134 
135 #define	hash__pmd_bad(pmd)		(pmd_val(pmd) & H_PMD_BAD_BITS)
136 #define	hash__pud_bad(pud)		(pud_val(pud) & H_PUD_BAD_BITS)
137 static inline int hash__p4d_bad(p4d_t p4d)
138 {
139 	return (p4d_val(p4d) == 0);
140 }
141 #ifdef CONFIG_STRICT_KERNEL_RWX
142 extern void hash__mark_rodata_ro(void);
143 extern void hash__mark_initmem_nx(void);
144 #endif
145 
146 extern void hpte_need_flush(struct mm_struct *mm, unsigned long addr,
147 			    pte_t *ptep, unsigned long pte, int huge);
148 extern unsigned long htab_convert_pte_flags(unsigned long pteflags);
149 /* Atomic PTE updates */
150 static inline unsigned long hash__pte_update(struct mm_struct *mm,
151 					 unsigned long addr,
152 					 pte_t *ptep, unsigned long clr,
153 					 unsigned long set,
154 					 int huge)
155 {
156 	__be64 old_be, tmp_be;
157 	unsigned long old;
158 
159 	__asm__ __volatile__(
160 	"1:	ldarx	%0,0,%3		# pte_update\n\
161 	and.	%1,%0,%6\n\
162 	bne-	1b \n\
163 	andc	%1,%0,%4 \n\
164 	or	%1,%1,%7\n\
165 	stdcx.	%1,0,%3 \n\
166 	bne-	1b"
167 	: "=&r" (old_be), "=&r" (tmp_be), "=m" (*ptep)
168 	: "r" (ptep), "r" (cpu_to_be64(clr)), "m" (*ptep),
169 	  "r" (cpu_to_be64(H_PAGE_BUSY)), "r" (cpu_to_be64(set))
170 	: "cc" );
171 	/* huge pages use the old page table lock */
172 	if (!huge)
173 		assert_pte_locked(mm, addr);
174 
175 	old = be64_to_cpu(old_be);
176 	if (old & H_PAGE_HASHPTE)
177 		hpte_need_flush(mm, addr, ptep, old, huge);
178 
179 	return old;
180 }
181 
182 /* Set the dirty and/or accessed bits atomically in a linux PTE, this
183  * function doesn't need to flush the hash entry
184  */
185 static inline void hash__ptep_set_access_flags(pte_t *ptep, pte_t entry)
186 {
187 	__be64 old, tmp, val, mask;
188 
189 	mask = cpu_to_be64(_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_READ | _PAGE_WRITE |
190 			   _PAGE_EXEC | _PAGE_SOFT_DIRTY);
191 
192 	val = pte_raw(entry) & mask;
193 
194 	__asm__ __volatile__(
195 	"1:	ldarx	%0,0,%4\n\
196 		and.	%1,%0,%6\n\
197 		bne-	1b \n\
198 		or	%0,%3,%0\n\
199 		stdcx.	%0,0,%4\n\
200 		bne-	1b"
201 	:"=&r" (old), "=&r" (tmp), "=m" (*ptep)
202 	:"r" (val), "r" (ptep), "m" (*ptep), "r" (cpu_to_be64(H_PAGE_BUSY))
203 	:"cc");
204 }
205 
206 static inline int hash__pte_same(pte_t pte_a, pte_t pte_b)
207 {
208 	return (((pte_raw(pte_a) ^ pte_raw(pte_b)) & ~cpu_to_be64(_PAGE_HPTEFLAGS)) == 0);
209 }
210 
211 static inline int hash__pte_none(pte_t pte)
212 {
213 	return (pte_val(pte) & ~H_PTE_NONE_MASK) == 0;
214 }
215 
216 unsigned long pte_get_hash_gslot(unsigned long vpn, unsigned long shift,
217 		int ssize, real_pte_t rpte, unsigned int subpg_index);
218 
219 /* This low level function performs the actual PTE insertion
220  * Setting the PTE depends on the MMU type and other factors. It's
221  * an horrible mess that I'm not going to try to clean up now but
222  * I'm keeping it in one place rather than spread around
223  */
224 static inline void hash__set_pte_at(struct mm_struct *mm, unsigned long addr,
225 				  pte_t *ptep, pte_t pte, int percpu)
226 {
227 	/*
228 	 * Anything else just stores the PTE normally. That covers all 64-bit
229 	 * cases, and 32-bit non-hash with 32-bit PTEs.
230 	 */
231 	*ptep = pte;
232 }
233 
234 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
235 extern void hpte_do_hugepage_flush(struct mm_struct *mm, unsigned long addr,
236 				   pmd_t *pmdp, unsigned long old_pmd);
237 #else
238 static inline void hpte_do_hugepage_flush(struct mm_struct *mm,
239 					  unsigned long addr, pmd_t *pmdp,
240 					  unsigned long old_pmd)
241 {
242 	WARN(1, "%s called with THP disabled\n", __func__);
243 }
244 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
245 
246 
247 int hash__map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot);
248 extern int __meminit hash__vmemmap_create_mapping(unsigned long start,
249 					      unsigned long page_size,
250 					      unsigned long phys);
251 extern void hash__vmemmap_remove_mapping(unsigned long start,
252 				     unsigned long page_size);
253 
254 int hash__create_section_mapping(unsigned long start, unsigned long end,
255 				 int nid, pgprot_t prot);
256 int hash__remove_section_mapping(unsigned long start, unsigned long end);
257 
258 #endif /* !__ASSEMBLY__ */
259 #endif /* __KERNEL__ */
260 #endif /* _ASM_POWERPC_BOOK3S_64_HASH_H */
261