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git.ipfire.org Git - thirdparty/linux.git/blob - arch/powerpc/mm/mem.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
6 * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
7 * and Cort Dougan (PReP) (cort@cs.nmt.edu)
8 * Copyright (C) 1996 Paul Mackerras
9 * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
11 * Derived from "arch/i386/mm/init.c"
12 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
15 #include <linux/export.h>
16 #include <linux/sched.h>
17 #include <linux/kernel.h>
18 #include <linux/errno.h>
19 #include <linux/string.h>
20 #include <linux/gfp.h>
21 #include <linux/types.h>
23 #include <linux/stddef.h>
24 #include <linux/init.h>
25 #include <linux/memblock.h>
26 #include <linux/highmem.h>
27 #include <linux/initrd.h>
28 #include <linux/pagemap.h>
29 #include <linux/suspend.h>
30 #include <linux/hugetlb.h>
31 #include <linux/slab.h>
32 #include <linux/vmalloc.h>
33 #include <linux/memremap.h>
35 #include <asm/pgalloc.h>
38 #include <asm/mmu_context.h>
39 #include <asm/pgtable.h>
42 #include <asm/machdep.h>
43 #include <asm/btext.h>
45 #include <asm/sections.h>
46 #include <asm/sparsemem.h>
48 #include <asm/fixmap.h>
49 #include <asm/swiotlb.h>
52 #include <mm/mmu_decl.h>
54 #ifndef CPU_FTR_COHERENT_ICACHE
55 #define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */
56 #define CPU_FTR_NOEXECUTE 0
59 unsigned long long memory_limit
;
60 bool init_mem_is_free
;
64 EXPORT_SYMBOL(kmap_pte
);
66 EXPORT_SYMBOL(kmap_prot
);
68 static inline pte_t
*virt_to_kpte(unsigned long vaddr
)
70 return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr
),
71 vaddr
), vaddr
), vaddr
);
75 pgprot_t
phys_mem_access_prot(struct file
*file
, unsigned long pfn
,
76 unsigned long size
, pgprot_t vma_prot
)
78 if (ppc_md
.phys_mem_access_prot
)
79 return ppc_md
.phys_mem_access_prot(file
, pfn
, size
, vma_prot
);
81 if (!page_is_ram(pfn
))
82 vma_prot
= pgprot_noncached(vma_prot
);
86 EXPORT_SYMBOL(phys_mem_access_prot
);
88 #ifdef CONFIG_MEMORY_HOTPLUG
91 int memory_add_physaddr_to_nid(u64 start
)
93 return hot_add_scn_to_nid(start
);
97 int __weak
create_section_mapping(unsigned long start
, unsigned long end
, int nid
)
102 int __weak
remove_section_mapping(unsigned long start
, unsigned long end
)
107 int __ref
arch_add_memory(int nid
, u64 start
, u64 size
,
108 struct mhp_restrictions
*restrictions
)
110 unsigned long start_pfn
= start
>> PAGE_SHIFT
;
111 unsigned long nr_pages
= size
>> PAGE_SHIFT
;
114 resize_hpt_for_hotplug(memblock_phys_mem_size());
116 start
= (unsigned long)__va(start
);
117 rc
= create_section_mapping(start
, start
+ size
, nid
);
119 pr_warn("Unable to create mapping for hot added memory 0x%llx..0x%llx: %d\n",
120 start
, start
+ size
, rc
);
123 flush_dcache_range(start
, start
+ size
);
125 return __add_pages(nid
, start_pfn
, nr_pages
, restrictions
);
128 void __ref
arch_remove_memory(int nid
, u64 start
, u64 size
,
129 struct vmem_altmap
*altmap
)
131 unsigned long start_pfn
= start
>> PAGE_SHIFT
;
132 unsigned long nr_pages
= size
>> PAGE_SHIFT
;
133 struct page
*page
= pfn_to_page(start_pfn
) + vmem_altmap_offset(altmap
);
136 __remove_pages(page_zone(page
), start_pfn
, nr_pages
, altmap
);
138 /* Remove htab bolted mappings for this section of memory */
139 start
= (unsigned long)__va(start
);
140 flush_dcache_range(start
, start
+ size
);
141 ret
= remove_section_mapping(start
, start
+ size
);
144 /* Ensure all vmalloc mappings are flushed in case they also
145 * hit that section of memory
149 if (resize_hpt_for_hotplug(memblock_phys_mem_size()) == -ENOSPC
)
150 pr_warn("Hash collision while resizing HPT\n");
154 #ifndef CONFIG_NEED_MULTIPLE_NODES
155 void __init
mem_topology_setup(void)
157 max_low_pfn
= max_pfn
= memblock_end_of_DRAM() >> PAGE_SHIFT
;
158 min_low_pfn
= MEMORY_START
>> PAGE_SHIFT
;
159 #ifdef CONFIG_HIGHMEM
160 max_low_pfn
= lowmem_end_addr
>> PAGE_SHIFT
;
163 /* Place all memblock_regions in the same node and merge contiguous
166 memblock_set_node(0, PHYS_ADDR_MAX
, &memblock
.memory
, 0);
169 void __init
initmem_init(void)
171 /* XXX need to clip this if using highmem? */
172 sparse_memory_present_with_active_regions(0);
176 /* mark pages that don't exist as nosave */
177 static int __init
mark_nonram_nosave(void)
179 struct memblock_region
*reg
, *prev
= NULL
;
181 for_each_memblock(memory
, reg
) {
183 memblock_region_memory_end_pfn(prev
) < memblock_region_memory_base_pfn(reg
))
184 register_nosave_region(memblock_region_memory_end_pfn(prev
),
185 memblock_region_memory_base_pfn(reg
));
190 #else /* CONFIG_NEED_MULTIPLE_NODES */
191 static int __init
mark_nonram_nosave(void)
200 * We setup ZONE_DMA to be 31-bits on all platforms and ZONE_NORMAL to be
201 * everything else. GFP_DMA32 page allocations automatically fall back to
204 * By using 31-bit unconditionally, we can exploit ARCH_ZONE_DMA_BITS to
205 * inform the generic DMA mapping code. 32-bit only devices (if not handled
206 * by an IOMMU anyway) will take a first dip into ZONE_NORMAL and get
207 * otherwise served by ZONE_DMA.
209 static unsigned long max_zone_pfns
[MAX_NR_ZONES
];
212 * paging_init() sets up the page tables - in fact we've already done this.
214 void __init
paging_init(void)
216 unsigned long long total_ram
= memblock_phys_mem_size();
217 phys_addr_t top_of_ram
= memblock_end_of_DRAM();
220 unsigned long v
= __fix_to_virt(__end_of_fixed_addresses
- 1);
221 unsigned long end
= __fix_to_virt(FIX_HOLE
);
223 for (; v
< end
; v
+= PAGE_SIZE
)
224 map_kernel_page(v
, 0, __pgprot(0)); /* XXX gross */
227 #ifdef CONFIG_HIGHMEM
228 map_kernel_page(PKMAP_BASE
, 0, __pgprot(0)); /* XXX gross */
229 pkmap_page_table
= virt_to_kpte(PKMAP_BASE
);
231 kmap_pte
= virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN
));
232 kmap_prot
= PAGE_KERNEL
;
233 #endif /* CONFIG_HIGHMEM */
235 printk(KERN_DEBUG
"Top of RAM: 0x%llx, Total RAM: 0x%llx\n",
236 (unsigned long long)top_of_ram
, total_ram
);
237 printk(KERN_DEBUG
"Memory hole size: %ldMB\n",
238 (long int)((top_of_ram
- total_ram
) >> 20));
240 #ifdef CONFIG_ZONE_DMA
241 max_zone_pfns
[ZONE_DMA
] = min(max_low_pfn
,
242 ((1UL << ARCH_ZONE_DMA_BITS
) - 1) >> PAGE_SHIFT
);
244 max_zone_pfns
[ZONE_NORMAL
] = max_low_pfn
;
245 #ifdef CONFIG_HIGHMEM
246 max_zone_pfns
[ZONE_HIGHMEM
] = max_pfn
;
249 free_area_init_nodes(max_zone_pfns
);
251 mark_nonram_nosave();
254 void __init
mem_init(void)
257 * book3s is limited to 16 page sizes due to encoding this in
258 * a 4-bit field for slices.
260 BUILD_BUG_ON(MMU_PAGE_COUNT
> 16);
262 #ifdef CONFIG_SWIOTLB
266 high_memory
= (void *) __va(max_low_pfn
* PAGE_SIZE
);
267 set_max_mapnr(max_pfn
);
270 #ifdef CONFIG_HIGHMEM
272 unsigned long pfn
, highmem_mapnr
;
274 highmem_mapnr
= lowmem_end_addr
>> PAGE_SHIFT
;
275 for (pfn
= highmem_mapnr
; pfn
< max_mapnr
; ++pfn
) {
276 phys_addr_t paddr
= (phys_addr_t
)pfn
<< PAGE_SHIFT
;
277 struct page
*page
= pfn_to_page(pfn
);
278 if (!memblock_is_reserved(paddr
))
279 free_highmem_page(page
);
282 #endif /* CONFIG_HIGHMEM */
284 #if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP)
286 * If smp is enabled, next_tlbcam_idx is initialized in the cpu up
287 * functions.... do it here for the non-smp case.
289 per_cpu(next_tlbcam_idx
, smp_processor_id()) =
290 (mfspr(SPRN_TLB1CFG
) & TLBnCFG_N_ENTRY
) - 1;
293 mem_init_print_info(NULL
);
295 pr_info("Kernel virtual memory layout:\n");
297 pr_info(" * 0x%08lx..0x%08lx : kasan shadow mem\n",
298 KASAN_SHADOW_START
, KASAN_SHADOW_END
);
300 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START
, FIXADDR_TOP
);
301 #ifdef CONFIG_HIGHMEM
302 pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
303 PKMAP_BASE
, PKMAP_ADDR(LAST_PKMAP
));
304 #endif /* CONFIG_HIGHMEM */
305 #ifdef CONFIG_NOT_COHERENT_CACHE
306 pr_info(" * 0x%08lx..0x%08lx : consistent mem\n",
307 IOREMAP_TOP
, IOREMAP_TOP
+ CONFIG_CONSISTENT_SIZE
);
308 #endif /* CONFIG_NOT_COHERENT_CACHE */
309 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
310 ioremap_bot
, IOREMAP_TOP
);
311 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
312 VMALLOC_START
, VMALLOC_END
);
313 #endif /* CONFIG_PPC32 */
316 void free_initmem(void)
318 ppc_md
.progress
= ppc_printk_progress
;
320 init_mem_is_free
= true;
321 free_initmem_default(POISON_FREE_INITMEM
);
325 * This is called when a page has been modified by the kernel.
326 * It just marks the page as not i-cache clean. We do the i-cache
327 * flush later when the page is given to a user process, if necessary.
329 void flush_dcache_page(struct page
*page
)
331 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE
))
333 /* avoid an atomic op if possible */
334 if (test_bit(PG_arch_1
, &page
->flags
))
335 clear_bit(PG_arch_1
, &page
->flags
);
337 EXPORT_SYMBOL(flush_dcache_page
);
339 void flush_dcache_icache_page(struct page
*page
)
341 #ifdef CONFIG_HUGETLB_PAGE
342 if (PageCompound(page
)) {
343 flush_dcache_icache_hugepage(page
);
347 #if defined(CONFIG_PPC_8xx) || defined(CONFIG_PPC64)
348 /* On 8xx there is no need to kmap since highmem is not supported */
349 __flush_dcache_icache(page_address(page
));
351 if (IS_ENABLED(CONFIG_BOOKE
) || sizeof(phys_addr_t
) > sizeof(void *)) {
352 void *start
= kmap_atomic(page
);
353 __flush_dcache_icache(start
);
354 kunmap_atomic(start
);
356 __flush_dcache_icache_phys(page_to_pfn(page
) << PAGE_SHIFT
);
360 EXPORT_SYMBOL(flush_dcache_icache_page
);
362 void clear_user_page(void *page
, unsigned long vaddr
, struct page
*pg
)
367 * We shouldn't have to do this, but some versions of glibc
368 * require it (ld.so assumes zero filled pages are icache clean)
371 flush_dcache_page(pg
);
373 EXPORT_SYMBOL(clear_user_page
);
375 void copy_user_page(void *vto
, void *vfrom
, unsigned long vaddr
,
378 copy_page(vto
, vfrom
);
381 * We should be able to use the following optimisation, however
382 * there are two problems.
383 * Firstly a bug in some versions of binutils meant PLT sections
384 * were not marked executable.
385 * Secondly the first word in the GOT section is blrl, used
386 * to establish the GOT address. Until recently the GOT was
387 * not marked executable.
391 if (!vma
->vm_file
&& ((vma
->vm_flags
& VM_EXEC
) == 0))
395 flush_dcache_page(pg
);
398 void flush_icache_user_range(struct vm_area_struct
*vma
, struct page
*page
,
399 unsigned long addr
, int len
)
403 maddr
= (unsigned long) kmap(page
) + (addr
& ~PAGE_MASK
);
404 flush_icache_range(maddr
, maddr
+ len
);
407 EXPORT_SYMBOL(flush_icache_user_range
);
410 * This is called at the end of handling a user page fault, when the
411 * fault has been handled by updating a PTE in the linux page tables.
412 * We use it to preload an HPTE into the hash table corresponding to
413 * the updated linux PTE.
415 * This must always be called with the pte lock held.
417 void update_mmu_cache(struct vm_area_struct
*vma
, unsigned long address
,
420 #ifdef CONFIG_PPC_BOOK3S
422 * We don't need to worry about _PAGE_PRESENT here because we are
423 * called with either mm->page_table_lock held or ptl lock held
428 if (radix_enabled()) {
429 prefetch((void *)address
);
433 /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
434 if (!pte_young(*ptep
) || address
>= TASK_SIZE
)
437 /* We try to figure out if we are coming from an instruction
438 * access fault and pass that down to __hash_page so we avoid
439 * double-faulting on execution of fresh text. We have to test
440 * for regs NULL since init will get here first thing at boot
442 * We also avoid filling the hash if not coming from a fault
445 trap
= current
->thread
.regs
? TRAP(current
->thread
.regs
) : 0UL;
457 hash_preload(vma
->vm_mm
, address
, is_exec
, trap
);
458 #endif /* CONFIG_PPC_BOOK3S */
459 #if (defined(CONFIG_PPC_BOOK3E_64) || defined(CONFIG_PPC_FSL_BOOK3E)) \
460 && defined(CONFIG_HUGETLB_PAGE)
461 if (is_vm_hugetlb_page(vma
))
462 book3e_hugetlb_preload(vma
, address
, *ptep
);
467 * System memory should not be in /proc/iomem but various tools expect it
470 static int __init
add_system_ram_resources(void)
472 struct memblock_region
*reg
;
474 for_each_memblock(memory
, reg
) {
475 struct resource
*res
;
476 unsigned long base
= reg
->base
;
477 unsigned long size
= reg
->size
;
479 res
= kzalloc(sizeof(struct resource
), GFP_KERNEL
);
483 res
->name
= "System RAM";
485 res
->end
= base
+ size
- 1;
486 res
->flags
= IORESOURCE_SYSTEM_RAM
| IORESOURCE_BUSY
;
487 WARN_ON(request_resource(&iomem_resource
, res
) < 0);
493 subsys_initcall(add_system_ram_resources
);
495 #ifdef CONFIG_STRICT_DEVMEM
497 * devmem_is_allowed(): check to see if /dev/mem access to a certain address
498 * is valid. The argument is a physical page number.
500 * Access has to be given to non-kernel-ram areas as well, these contain the
501 * PCI mmio resources as well as potential bios/acpi data regions.
503 int devmem_is_allowed(unsigned long pfn
)
505 if (page_is_rtas_user_buf(pfn
))
507 if (iomem_is_exclusive(PFN_PHYS(pfn
)))
509 if (!page_is_ram(pfn
))
513 #endif /* CONFIG_STRICT_DEVMEM */
516 * This is defined in kernel/resource.c but only powerpc needs to export it, for
517 * the EHEA driver. Drop this when drivers/net/ethernet/ibm/ehea is removed.
519 EXPORT_SYMBOL_GPL(walk_system_ram_range
);