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2024-01-04 1543e317f1da31b75942316931e8f491a8920811 
 kernel/arch/arm64/include/asm/memory.h
....@@ -1,32 +1,18 @@
1
+/* SPDX-License-Identifier: GPL-2.0-only */
12 /*
23  * Based on arch/arm/include/asm/memory.h
34  *
45  * Copyright (C) 2000-2002 Russell King
56  * Copyright (C) 2012 ARM Ltd.
67  *
7
- * This program is free software; you can redistribute it and/or modify
8
- * it under the terms of the GNU General Public License version 2 as
9
- * published by the Free Software Foundation.
10
- *
11
- * This program is distributed in the hope that it will be useful,
12
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14
- * GNU General Public License for more details.
15
- *
16
- * You should have received a copy of the GNU General Public License
17
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
18
- *
198  * Note: this file should not be included by non-asm/.h files
209  */
2110 #ifndef __ASM_MEMORY_H
2211 #define __ASM_MEMORY_H
2312 
24
-#include <linux/compiler.h>
2513 #include <linux/const.h>
26
-#include <linux/types.h>
27
-#include <asm/bug.h>
14
+#include <linux/sizes.h>
2815 #include <asm/page-def.h>
29
-#include <asm/sizes.h>
3016 
3117 /*
3218  * Size of the PCI I/O space. This must remain a power of two so that
....@@ -35,56 +21,63 @@
3521 #define PCI_IO_SIZE		SZ_16M
3622 
3723 /*
38
- * Log2 of the upper bound of the size of a struct page. Used for sizing
39
- * the vmemmap region only, does not affect actual memory footprint.
40
- * We don't use sizeof(struct page) directly since taking its size here
41
- * requires its definition to be available at this point in the inclusion
42
- * chain, and it may not be a power of 2 in the first place.
43
- */
44
-#define STRUCT_PAGE_MAX_SHIFT	6
45
-
46
-/*
4724  * VMEMMAP_SIZE - allows the whole linear region to be covered by
4825  *                a struct page array
26
+ *
27
+ * If we are configured with a 52-bit kernel VA then our VMEMMAP_SIZE
28
+ * needs to cover the memory region from the beginning of the 52-bit
29
+ * PAGE_OFFSET all the way to PAGE_END for 48-bit. This allows us to
30
+ * keep a constant PAGE_OFFSET and "fallback" to using the higher end
31
+ * of the VMEMMAP where 52-bit support is not available in hardware.
4932  */
50
-#define VMEMMAP_SIZE (UL(1) << (VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT))
33
+#define VMEMMAP_SIZE ((_PAGE_END(VA_BITS_MIN) - PAGE_OFFSET) \
34
+			>> (PAGE_SHIFT - STRUCT_PAGE_MAX_SHIFT))
5135 
5236 /*
53
- * PAGE_OFFSET - the virtual address of the start of the linear map (top
54
- *		 (VA_BITS - 1))
55
- * KIMAGE_VADDR - the virtual address of the start of the kernel image
37
+ * PAGE_OFFSET - the virtual address of the start of the linear map, at the
38
+ *               start of the TTBR1 address space.
39
+ * PAGE_END - the end of the linear map, where all other kernel mappings begin.
40
+ * KIMAGE_VADDR - the virtual address of the start of the kernel image.
5641  * VA_BITS - the maximum number of bits for virtual addresses.
57
- * VA_START - the first kernel virtual address.
5842  */
5943 #define VA_BITS			(CONFIG_ARM64_VA_BITS)
60
-#define VA_START		(UL(0xffffffffffffffff) - \
61
-	(UL(1) << VA_BITS) + 1)
62
-#define PAGE_OFFSET		(UL(0xffffffffffffffff) - \
63
-	(UL(1) << (VA_BITS - 1)) + 1)
44
+#define _PAGE_OFFSET(va)	(-(UL(1) << (va)))
45
+#define PAGE_OFFSET		(_PAGE_OFFSET(VA_BITS))
6446 #define KIMAGE_VADDR		(MODULES_END)
6547 #define MODULES_END		(MODULES_VADDR + MODULES_VSIZE)
66
-#define MODULES_VADDR		(VA_START + KASAN_SHADOW_SIZE)
48
+#define MODULES_VADDR		(KASAN_SHADOW_END)
6749 #define MODULES_VSIZE		(SZ_128M)
68
-#define VMEMMAP_START		(PAGE_OFFSET - VMEMMAP_SIZE)
50
+#define VMEMMAP_START		(-VMEMMAP_SIZE - SZ_2M)
51
+#define VMEMMAP_END		(VMEMMAP_START + VMEMMAP_SIZE)
6952 #define PCI_IO_END		(VMEMMAP_START - SZ_2M)
7053 #define PCI_IO_START		(PCI_IO_END - PCI_IO_SIZE)
7154 #define FIXADDR_TOP		(PCI_IO_START - SZ_2M)
7255 
73
-#define KERNEL_START      _text
74
-#define KERNEL_END        _end
56
+#if VA_BITS > 48
57
+#define VA_BITS_MIN		(48)
58
+#else
59
+#define VA_BITS_MIN		(VA_BITS)
60
+#endif
61
+
62
+#define _PAGE_END(va)		(-(UL(1) << ((va) - 1)))
63
+
64
+#define KERNEL_START		_text
65
+#define KERNEL_END		_end
7566 
7667 /*
7768  * Generic and tag-based KASAN require 1/8th and 1/16th of the kernel virtual
7869  * address space for the shadow region respectively. They can bloat the stack
7970  * significantly, so double the (minimum) stack size when they are in use.
8071  */
81
-#ifdef CONFIG_KASAN
82
-#define KASAN_SHADOW_SIZE	(UL(1) << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
72
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
73
+#define KASAN_SHADOW_OFFSET	_AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
74
+#define KASAN_SHADOW_END	((UL(1) << (64 - KASAN_SHADOW_SCALE_SHIFT)) \
75
+					+ KASAN_SHADOW_OFFSET)
8376 #define KASAN_THREAD_SHIFT	1
8477 #else
85
-#define KASAN_SHADOW_SIZE	(0)
8678 #define KASAN_THREAD_SHIFT	0
87
-#endif
79
+#define KASAN_SHADOW_END	(_PAGE_END(VA_BITS_MIN))
80
+#endif /* CONFIG_KASAN */
8881 
8982 #define MIN_THREAD_SHIFT	(14 + KASAN_THREAD_SHIFT)
9083 
....@@ -121,32 +114,28 @@
121114 
122115 /*
123116  * Alignment of kernel segments (e.g. .text, .data).
124
- */
125
-#if defined(CONFIG_DEBUG_ALIGN_RODATA)
126
-/*
127
- *  4 KB granule:   1 level 2 entry
128
- * 16 KB granule: 128 level 3 entries, with contiguous bit
129
- * 64 KB granule:  32 level 3 entries, with contiguous bit
130
- */
131
-#define SEGMENT_ALIGN			SZ_2M
132
-#else
133
-/*
117
+ *
134118  *  4 KB granule:  16 level 3 entries, with contiguous bit
135119  * 16 KB granule:   4 level 3 entries, without contiguous bit
136120  * 64 KB granule:   1 level 3 entry
137121  */
138
-#define SEGMENT_ALIGN			SZ_64K
139
-#endif
122
+#define SEGMENT_ALIGN		SZ_64K
140123 
141124 /*
142125  * Memory types available.
126
+ *
127
+ * IMPORTANT: MT_NORMAL must be index 0 since vm_get_page_prot() may 'or' in
128
+ *	      the MT_NORMAL_TAGGED memory type for PROT_MTE mappings. Note
129
+ *	      that protection_map[] only contains MT_NORMAL attributes.
143130  */
144
-#define MT_DEVICE_nGnRnE	0
145
-#define MT_DEVICE_nGnRE		1
146
-#define MT_DEVICE_GRE		2
147
-#define MT_NORMAL_NC		3
148
-#define MT_NORMAL		4
149
-#define MT_NORMAL_WT		5
131
+#define MT_NORMAL		0
132
+#define MT_NORMAL_TAGGED	1
133
+#define MT_NORMAL_NC		2
134
+#define MT_NORMAL_WT		3
135
+#define MT_DEVICE_nGnRnE	4
136
+#define MT_DEVICE_nGnRE		5
137
+#define MT_DEVICE_GRE		6
138
+#define MT_NORMAL_iNC_oWB	7
150139 
151140 /*
152141  * Memory types for Stage-2 translation
....@@ -167,24 +156,22 @@
167156 #define IOREMAP_MAX_ORDER	(PMD_SHIFT)
168157 #endif
169158 
170
-#ifdef CONFIG_BLK_DEV_INITRD
171
-#define __early_init_dt_declare_initrd(__start, __end)			\
172
-	do {								\
173
-		initrd_start = (__start);				\
174
-		initrd_end = (__end);					\
175
-	} while (0)
176
-#endif
177
-
178159 #ifndef __ASSEMBLY__
179160 
180161 #include <linux/bitops.h>
162
+#include <linux/compiler.h>
181163 #include <linux/mmdebug.h>
164
+#include <linux/types.h>
165
+#include <asm/bug.h>
166
+
167
+extern u64			vabits_actual;
168
+#define PAGE_END		(_PAGE_END(vabits_actual))
182169 
183170 extern s64			memstart_addr;
184171 /* PHYS_OFFSET - the physical address of the start of memory. */
185172 #define PHYS_OFFSET		({ VM_BUG_ON(memstart_addr & 1); memstart_addr; })
186173 
187
-/* the virtual base of the kernel image (minus TEXT_OFFSET) */
174
+/* the virtual base of the kernel image */
188175 extern u64			kimage_vaddr;
189176 
190177 /* the offset between the kernel virtual and physical mappings */
....@@ -225,7 +212,7 @@
225212 	(__force __typeof__(addr))__addr;				\
226213 })
227214 
228
-#ifdef CONFIG_KASAN_SW_TAGS
215
+#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
229216 #define __tag_shifted(tag)	((u64)(tag) << 56)
230217 #define __tag_reset(addr)	__untagged_addr(addr)
231218 #define __tag_get(addr)		(__u8)((u64)(addr) >> 56)
....@@ -233,13 +220,24 @@
233220 #define __tag_shifted(tag)	0UL
234221 #define __tag_reset(addr)	(addr)
235222 #define __tag_get(addr)		0
236
-#endif
223
+#endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */
237224 
238225 static inline const void *__tag_set(const void *addr, u8 tag)
239226 {
240227 	u64 __addr = (u64)addr & ~__tag_shifted(0xff);
241228 	return (const void *)(__addr | __tag_shifted(tag));
242229 }
230
+
231
+#ifdef CONFIG_KASAN_HW_TAGS
232
+#define arch_enable_tagging_sync()		mte_enable_kernel_sync()
233
+#define arch_enable_tagging_async()		mte_enable_kernel_async()
234
+#define arch_set_tagging_report_once(state)	mte_set_report_once(state)
235
+#define arch_force_async_tag_fault()		mte_check_tfsr_exit()
236
+#define arch_get_random_tag()			mte_get_random_tag()
237
+#define arch_get_mem_tag(addr)			mte_get_mem_tag(addr)
238
+#define arch_set_mem_tag_range(addr, size, tag, init)	\
239
+			mte_set_mem_tag_range((addr), (size), (tag), (init))
240
+#endif /* CONFIG_KASAN_HW_TAGS */
243241 
244242 /*
245243  * Physical vs virtual RAM address space conversion.  These are
....@@ -249,19 +247,18 @@
249247 
250248 
251249 /*
252
- * The linear kernel range starts in the middle of the virtual adddress
253
- * space. Testing the top bit for the start of the region is a
254
- * sufficient check.
250
+ * Check whether an arbitrary address is within the linear map, which
251
+ * lives in the [PAGE_OFFSET, PAGE_END) interval at the bottom of the
252
+ * kernel's TTBR1 address range.
255253  */
256
-#define __is_lm_address(addr)	(!!((addr) & BIT(VA_BITS - 1)))
254
+#define __is_lm_address(addr)	(((u64)(addr) ^ PAGE_OFFSET) < (PAGE_END - PAGE_OFFSET))
257255 
258256 #define __lm_to_phys(addr)	(((addr) & ~PAGE_OFFSET) + PHYS_OFFSET)
259257 #define __kimg_to_phys(addr)	((addr) - kimage_voffset)
260258 
261259 #define __virt_to_phys_nodebug(x) ({					\
262
-	phys_addr_t __x = (phys_addr_t)(x);				\
263
-	__is_lm_address(__x) ? __lm_to_phys(__x) :			\
264
-			       __kimg_to_phys(__x);			\
260
+	phys_addr_t __x = (phys_addr_t)(__tag_reset(x));		\
261
+	__is_lm_address(__x) ? __lm_to_phys(__x) : __kimg_to_phys(__x);	\
265262 })
266263 
267264 #define __pa_symbol_nodebug(x)	__kimg_to_phys((phys_addr_t)(x))
....@@ -272,7 +269,7 @@
272269 #else
273270 #define __virt_to_phys(x)	__virt_to_phys_nodebug(x)
274271 #define __phys_addr_symbol(x)	__pa_symbol_nodebug(x)
275
-#endif
272
+#endif /* CONFIG_DEBUG_VIRTUAL */
276273 
277274 #define __phys_to_virt(x)	((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET)
278275 #define __phys_to_kimg(x)	((unsigned long)((x) + kimage_voffset))
....@@ -308,8 +305,8 @@
308305 #define __pa_nodebug(x)		__virt_to_phys_nodebug((unsigned long)(x))
309306 #define __va(x)			((void *)__phys_to_virt((phys_addr_t)(x)))
310307 #define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
311
-#define virt_to_pfn(x)      __phys_to_pfn(__virt_to_phys((unsigned long)(x)))
312
-#define sym_to_pfn(x)	    __phys_to_pfn(__pa_symbol(x))
308
+#define virt_to_pfn(x)		__phys_to_pfn(__virt_to_phys((unsigned long)(x)))
309
+#define sym_to_pfn(x)		__phys_to_pfn(__pa_symbol(x))
313310 
314311 /*
315312  * With non-canonical CFI jump tables, the compiler replaces function
....@@ -320,46 +317,62 @@
320317  * virtual address. Therefore, use inline assembly to ensure we are
321318  * always taking the address of the actual function.
322319  */
323
-#define __pa_function(x) ({						\
324
-	unsigned long addr;						\
320
+#define __va_function(x) ({						\
321
+	void *addr;							\
325322 	asm("adrp %0, " __stringify(x) "\n\t"				\
326323 	    "add  %0, %0, :lo12:" __stringify(x) : "=r" (addr));	\
327
-	__pa_symbol(addr);						\
324
+	addr;								\
328325 })
329326 
327
+#define __pa_function(x) 	__pa_symbol(__va_function(x))
328
+
330329 /*
331
- *  virt_to_page(k)	convert a _valid_ virtual address to struct page *
332
- *  virt_addr_valid(k)	indicates whether a virtual address is valid
330
+ *  virt_to_page(x)	convert a _valid_ virtual address to struct page *
331
+ *  virt_addr_valid(x)	indicates whether a virtual address is valid
333332  */
334333 #define ARCH_PFN_OFFSET		((unsigned long)PHYS_PFN_OFFSET)
335334 
336
-#ifndef CONFIG_SPARSEMEM_VMEMMAP
337
-#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
338
-#define _virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
335
+#if !defined(CONFIG_SPARSEMEM_VMEMMAP) || defined(CONFIG_DEBUG_VIRTUAL)
336
+#define page_to_virt(x)	({						\
337
+	__typeof__(x) __page = x;					\
338
+	void *__addr = __va(page_to_phys(__page));			\
339
+	(void *)__tag_set((const void *)__addr, page_kasan_tag(__page));\
340
+})
341
+#define virt_to_page(x)		pfn_to_page(virt_to_pfn(x))
339342 #else
340
-#define __virt_to_pgoff(kaddr)	(((u64)(kaddr) & ~PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page))
341
-#define __page_to_voff(kaddr)	(((u64)(kaddr) & ~VMEMMAP_START) * PAGE_SIZE / sizeof(struct page))
342
-
343
-#define page_to_virt(page)	({					\
344
-	unsigned long __addr =						\
345
-		((__page_to_voff(page)) | PAGE_OFFSET);			\
346
-	const void *__addr_tag =					\
347
-		__tag_set((void *)__addr, page_kasan_tag(page));	\
348
-	((void *)__addr_tag);						\
343
+#define page_to_virt(x)	({						\
344
+	__typeof__(x) __page = x;					\
345
+	u64 __idx = ((u64)__page - VMEMMAP_START) / sizeof(struct page);\
346
+	u64 __addr = PAGE_OFFSET + (__idx * PAGE_SIZE);			\
347
+	(void *)__tag_set((const void *)__addr, page_kasan_tag(__page));\
349348 })
350349 
351
-#define virt_to_page(vaddr)	((struct page *)((__virt_to_pgoff(vaddr)) | VMEMMAP_START))
350
+#define virt_to_page(x)	({						\
351
+	u64 __idx = (__tag_reset((u64)x) - PAGE_OFFSET) / PAGE_SIZE;	\
352
+	u64 __addr = VMEMMAP_START + (__idx * sizeof(struct page));	\
353
+	(struct page *)__addr;						\
354
+})
355
+#endif /* !CONFIG_SPARSEMEM_VMEMMAP || CONFIG_DEBUG_VIRTUAL */
352356 
353
-#define _virt_addr_valid(kaddr)	pfn_valid((((u64)(kaddr) & ~PAGE_OFFSET) \
354
-					   + PHYS_OFFSET) >> PAGE_SHIFT)
355
-#endif
356
-#endif
357
+#define virt_addr_valid(addr)	({					\
358
+	__typeof__(addr) __addr = __tag_reset(addr);			\
359
+	__is_lm_address(__addr) && pfn_valid(virt_to_pfn(__addr));	\
360
+})
357361 
358
-#define _virt_addr_is_linear(kaddr)	\
359
-	(__tag_reset((u64)(kaddr)) >= PAGE_OFFSET)
360
-#define virt_addr_valid(kaddr)		\
361
-	(_virt_addr_is_linear(kaddr) && _virt_addr_valid(kaddr))
362
+void dump_mem_limit(void);
363
+#endif /* !ASSEMBLY */
364
+
365
+/*
366
+ * Given that the GIC architecture permits ITS implementations that can only be
367
+ * configured with a LPI table address once, GICv3 systems with many CPUs may
368
+ * end up reserving a lot of different regions after a kexec for their LPI
369
+ * tables (one per CPU), as we are forced to reuse the same memory after kexec
370
+ * (and thus reserve it persistently with EFI beforehand)
371
+ */
372
+#if defined(CONFIG_EFI) && defined(CONFIG_ARM_GIC_V3_ITS)
373
+# define INIT_MEMBLOCK_RESERVED_REGIONS	(INIT_MEMBLOCK_REGIONS + NR_CPUS + 1)
374
+#endif
362375 
363376 #include <asm-generic/memory_model.h>
364377 
365
-#endif
378
+#endif /* __ASM_MEMORY_H */