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Linux/arch/powerpc/mm/mem.c

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  1 /*
  2  *  PowerPC version
  3  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
  4  *
  5  *  Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
  6  *  and Cort Dougan (PReP) (cort@cs.nmt.edu)
  7  *    Copyright (C) 1996 Paul Mackerras
  8  *  PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
  9  *
 10  *  Derived from "arch/i386/mm/init.c"
 11  *    Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
 12  *
 13  *  This program is free software; you can redistribute it and/or
 14  *  modify it under the terms of the GNU General Public License
 15  *  as published by the Free Software Foundation; either version
 16  *  2 of the License, or (at your option) any later version.
 17  *
 18  */
 19 
 20 #include <linux/export.h>
 21 #include <linux/sched.h>
 22 #include <linux/kernel.h>
 23 #include <linux/errno.h>
 24 #include <linux/string.h>
 25 #include <linux/gfp.h>
 26 #include <linux/types.h>
 27 #include <linux/mm.h>
 28 #include <linux/stddef.h>
 29 #include <linux/init.h>
 30 #include <linux/bootmem.h>
 31 #include <linux/highmem.h>
 32 #include <linux/initrd.h>
 33 #include <linux/pagemap.h>
 34 #include <linux/suspend.h>
 35 #include <linux/memblock.h>
 36 #include <linux/hugetlb.h>
 37 #include <linux/slab.h>
 38 #include <linux/vmalloc.h>
 39 #include <linux/memremap.h>
 40 
 41 #include <asm/pgalloc.h>
 42 #include <asm/prom.h>
 43 #include <asm/io.h>
 44 #include <asm/mmu_context.h>
 45 #include <asm/pgtable.h>
 46 #include <asm/mmu.h>
 47 #include <asm/smp.h>
 48 #include <asm/machdep.h>
 49 #include <asm/btext.h>
 50 #include <asm/tlb.h>
 51 #include <asm/sections.h>
 52 #include <asm/sparsemem.h>
 53 #include <asm/vdso.h>
 54 #include <asm/fixmap.h>
 55 #include <asm/swiotlb.h>
 56 #include <asm/rtas.h>
 57 
 58 #include "mmu_decl.h"
 59 
 60 #ifndef CPU_FTR_COHERENT_ICACHE
 61 #define CPU_FTR_COHERENT_ICACHE 0       /* XXX for now */
 62 #define CPU_FTR_NOEXECUTE       0
 63 #endif
 64 
 65 unsigned long long memory_limit;
 66 
 67 #ifdef CONFIG_HIGHMEM
 68 pte_t *kmap_pte;
 69 EXPORT_SYMBOL(kmap_pte);
 70 pgprot_t kmap_prot;
 71 EXPORT_SYMBOL(kmap_prot);
 72 #define TOP_ZONE ZONE_HIGHMEM
 73 
 74 static inline pte_t *virt_to_kpte(unsigned long vaddr)
 75 {
 76         return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
 77                         vaddr), vaddr), vaddr);
 78 }
 79 #else
 80 #define TOP_ZONE ZONE_NORMAL
 81 #endif
 82 
 83 int page_is_ram(unsigned long pfn)
 84 {
 85         return memblock_is_memory(__pfn_to_phys(pfn));
 86 }
 87 
 88 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 89                               unsigned long size, pgprot_t vma_prot)
 90 {
 91         if (ppc_md.phys_mem_access_prot)
 92                 return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
 93 
 94         if (!page_is_ram(pfn))
 95                 vma_prot = pgprot_noncached(vma_prot);
 96 
 97         return vma_prot;
 98 }
 99 EXPORT_SYMBOL(phys_mem_access_prot);
100 
101 #ifdef CONFIG_MEMORY_HOTPLUG
102 
103 #ifdef CONFIG_NUMA
104 int memory_add_physaddr_to_nid(u64 start)
105 {
106         return hot_add_scn_to_nid(start);
107 }
108 #endif
109 
110 int __weak create_section_mapping(unsigned long start, unsigned long end, int nid)
111 {
112         return -ENODEV;
113 }
114 
115 int __weak remove_section_mapping(unsigned long start, unsigned long end)
116 {
117         return -ENODEV;
118 }
119 
120 int __meminit arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
121                 bool want_memblock)
122 {
123         unsigned long start_pfn = start >> PAGE_SHIFT;
124         unsigned long nr_pages = size >> PAGE_SHIFT;
125         int rc;
126 
127         resize_hpt_for_hotplug(memblock_phys_mem_size());
128 
129         start = (unsigned long)__va(start);
130         rc = create_section_mapping(start, start + size, nid);
131         if (rc) {
132                 pr_warn("Unable to create mapping for hot added memory 0x%llx..0x%llx: %d\n",
133                         start, start + size, rc);
134                 return -EFAULT;
135         }
136 
137         return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
138 }
139 
140 #ifdef CONFIG_MEMORY_HOTREMOVE
141 int __meminit arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
142 {
143         unsigned long start_pfn = start >> PAGE_SHIFT;
144         unsigned long nr_pages = size >> PAGE_SHIFT;
145         struct page *page;
146         int ret;
147 
148         /*
149          * If we have an altmap then we need to skip over any reserved PFNs
150          * when querying the zone.
151          */
152         page = pfn_to_page(start_pfn);
153         if (altmap)
154                 page += vmem_altmap_offset(altmap);
155 
156         ret = __remove_pages(page_zone(page), start_pfn, nr_pages, altmap);
157         if (ret)
158                 return ret;
159 
160         /* Remove htab bolted mappings for this section of memory */
161         start = (unsigned long)__va(start);
162         ret = remove_section_mapping(start, start + size);
163 
164         /* Ensure all vmalloc mappings are flushed in case they also
165          * hit that section of memory
166          */
167         vm_unmap_aliases();
168 
169         resize_hpt_for_hotplug(memblock_phys_mem_size());
170 
171         return ret;
172 }
173 #endif
174 #endif /* CONFIG_MEMORY_HOTPLUG */
175 
176 /*
177  * walk_memory_resource() needs to make sure there is no holes in a given
178  * memory range.  PPC64 does not maintain the memory layout in /proc/iomem.
179  * Instead it maintains it in memblock.memory structures.  Walk through the
180  * memory regions, find holes and callback for contiguous regions.
181  */
182 int
183 walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
184                 void *arg, int (*func)(unsigned long, unsigned long, void *))
185 {
186         struct memblock_region *reg;
187         unsigned long end_pfn = start_pfn + nr_pages;
188         unsigned long tstart, tend;
189         int ret = -1;
190 
191         for_each_memblock(memory, reg) {
192                 tstart = max(start_pfn, memblock_region_memory_base_pfn(reg));
193                 tend = min(end_pfn, memblock_region_memory_end_pfn(reg));
194                 if (tstart >= tend)
195                         continue;
196                 ret = (*func)(tstart, tend - tstart, arg);
197                 if (ret)
198                         break;
199         }
200         return ret;
201 }
202 EXPORT_SYMBOL_GPL(walk_system_ram_range);
203 
204 #ifndef CONFIG_NEED_MULTIPLE_NODES
205 void __init mem_topology_setup(void)
206 {
207         max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
208         min_low_pfn = MEMORY_START >> PAGE_SHIFT;
209 #ifdef CONFIG_HIGHMEM
210         max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
211 #endif
212 
213         /* Place all memblock_regions in the same node and merge contiguous
214          * memblock_regions
215          */
216         memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0);
217 }
218 
219 void __init initmem_init(void)
220 {
221         /* XXX need to clip this if using highmem? */
222         sparse_memory_present_with_active_regions(0);
223         sparse_init();
224 }
225 
226 /* mark pages that don't exist as nosave */
227 static int __init mark_nonram_nosave(void)
228 {
229         struct memblock_region *reg, *prev = NULL;
230 
231         for_each_memblock(memory, reg) {
232                 if (prev &&
233                     memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg))
234                         register_nosave_region(memblock_region_memory_end_pfn(prev),
235                                                memblock_region_memory_base_pfn(reg));
236                 prev = reg;
237         }
238         return 0;
239 }
240 #else /* CONFIG_NEED_MULTIPLE_NODES */
241 static int __init mark_nonram_nosave(void)
242 {
243         return 0;
244 }
245 #endif
246 
247 static bool zone_limits_final;
248 
249 /*
250  * The memory zones past TOP_ZONE are managed by generic mm code.
251  * These should be set to zero since that's what every other
252  * architecture does.
253  */
254 static unsigned long max_zone_pfns[MAX_NR_ZONES] = {
255         [0            ... TOP_ZONE        ] = ~0UL,
256         [TOP_ZONE + 1 ... MAX_NR_ZONES - 1] = 0
257 };
258 
259 /*
260  * Restrict the specified zone and all more restrictive zones
261  * to be below the specified pfn.  May not be called after
262  * paging_init().
263  */
264 void __init limit_zone_pfn(enum zone_type zone, unsigned long pfn_limit)
265 {
266         int i;
267 
268         if (WARN_ON(zone_limits_final))
269                 return;
270 
271         for (i = zone; i >= 0; i--) {
272                 if (max_zone_pfns[i] > pfn_limit)
273                         max_zone_pfns[i] = pfn_limit;
274         }
275 }
276 
277 /*
278  * Find the least restrictive zone that is entirely below the
279  * specified pfn limit.  Returns < 0 if no suitable zone is found.
280  *
281  * pfn_limit must be u64 because it can exceed 32 bits even on 32-bit
282  * systems -- the DMA limit can be higher than any possible real pfn.
283  */
284 int dma_pfn_limit_to_zone(u64 pfn_limit)
285 {
286         int i;
287 
288         for (i = TOP_ZONE; i >= 0; i--) {
289                 if (max_zone_pfns[i] <= pfn_limit)
290                         return i;
291         }
292 
293         return -EPERM;
294 }
295 
296 /*
297  * paging_init() sets up the page tables - in fact we've already done this.
298  */
299 void __init paging_init(void)
300 {
301         unsigned long long total_ram = memblock_phys_mem_size();
302         phys_addr_t top_of_ram = memblock_end_of_DRAM();
303 
304 #ifdef CONFIG_PPC32
305         unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1);
306         unsigned long end = __fix_to_virt(FIX_HOLE);
307 
308         for (; v < end; v += PAGE_SIZE)
309                 map_kernel_page(v, 0, 0); /* XXX gross */
310 #endif
311 
312 #ifdef CONFIG_HIGHMEM
313         map_kernel_page(PKMAP_BASE, 0, 0);      /* XXX gross */
314         pkmap_page_table = virt_to_kpte(PKMAP_BASE);
315 
316         kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
317         kmap_prot = PAGE_KERNEL;
318 #endif /* CONFIG_HIGHMEM */
319 
320         printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n",
321                (unsigned long long)top_of_ram, total_ram);
322         printk(KERN_DEBUG "Memory hole size: %ldMB\n",
323                (long int)((top_of_ram - total_ram) >> 20));
324 
325 #ifdef CONFIG_HIGHMEM
326         limit_zone_pfn(ZONE_NORMAL, lowmem_end_addr >> PAGE_SHIFT);
327 #endif
328         limit_zone_pfn(TOP_ZONE, top_of_ram >> PAGE_SHIFT);
329         zone_limits_final = true;
330         free_area_init_nodes(max_zone_pfns);
331 
332         mark_nonram_nosave();
333 }
334 
335 void __init mem_init(void)
336 {
337         /*
338          * book3s is limited to 16 page sizes due to encoding this in
339          * a 4-bit field for slices.
340          */
341         BUILD_BUG_ON(MMU_PAGE_COUNT > 16);
342 
343 #ifdef CONFIG_SWIOTLB
344         swiotlb_init(0);
345 #endif
346 
347         high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
348         set_max_mapnr(max_pfn);
349         free_all_bootmem();
350 
351 #ifdef CONFIG_HIGHMEM
352         {
353                 unsigned long pfn, highmem_mapnr;
354 
355                 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
356                 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
357                         phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT;
358                         struct page *page = pfn_to_page(pfn);
359                         if (!memblock_is_reserved(paddr))
360                                 free_highmem_page(page);
361                 }
362         }
363 #endif /* CONFIG_HIGHMEM */
364 
365 #if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP)
366         /*
367          * If smp is enabled, next_tlbcam_idx is initialized in the cpu up
368          * functions.... do it here for the non-smp case.
369          */
370         per_cpu(next_tlbcam_idx, smp_processor_id()) =
371                 (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
372 #endif
373 
374         mem_init_print_info(NULL);
375 #ifdef CONFIG_PPC32
376         pr_info("Kernel virtual memory layout:\n");
377         pr_info("  * 0x%08lx..0x%08lx  : fixmap\n", FIXADDR_START, FIXADDR_TOP);
378 #ifdef CONFIG_HIGHMEM
379         pr_info("  * 0x%08lx..0x%08lx  : highmem PTEs\n",
380                 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
381 #endif /* CONFIG_HIGHMEM */
382 #ifdef CONFIG_NOT_COHERENT_CACHE
383         pr_info("  * 0x%08lx..0x%08lx  : consistent mem\n",
384                 IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE);
385 #endif /* CONFIG_NOT_COHERENT_CACHE */
386         pr_info("  * 0x%08lx..0x%08lx  : early ioremap\n",
387                 ioremap_bot, IOREMAP_TOP);
388         pr_info("  * 0x%08lx..0x%08lx  : vmalloc & ioremap\n",
389                 VMALLOC_START, VMALLOC_END);
390 #endif /* CONFIG_PPC32 */
391 }
392 
393 void free_initmem(void)
394 {
395         ppc_md.progress = ppc_printk_progress;
396         mark_initmem_nx();
397         free_initmem_default(POISON_FREE_INITMEM);
398 }
399 
400 #ifdef CONFIG_BLK_DEV_INITRD
401 void __init free_initrd_mem(unsigned long start, unsigned long end)
402 {
403         free_reserved_area((void *)start, (void *)end, -1, "initrd");
404 }
405 #endif
406 
407 /*
408  * This is called when a page has been modified by the kernel.
409  * It just marks the page as not i-cache clean.  We do the i-cache
410  * flush later when the page is given to a user process, if necessary.
411  */
412 void flush_dcache_page(struct page *page)
413 {
414         if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
415                 return;
416         /* avoid an atomic op if possible */
417         if (test_bit(PG_arch_1, &page->flags))
418                 clear_bit(PG_arch_1, &page->flags);
419 }
420 EXPORT_SYMBOL(flush_dcache_page);
421 
422 void flush_dcache_icache_page(struct page *page)
423 {
424 #ifdef CONFIG_HUGETLB_PAGE
425         if (PageCompound(page)) {
426                 flush_dcache_icache_hugepage(page);
427                 return;
428         }
429 #endif
430 #if defined(CONFIG_PPC_8xx) || defined(CONFIG_PPC64)
431         /* On 8xx there is no need to kmap since highmem is not supported */
432         __flush_dcache_icache(page_address(page));
433 #else
434         if (IS_ENABLED(CONFIG_BOOKE) || sizeof(phys_addr_t) > sizeof(void *)) {
435                 void *start = kmap_atomic(page);
436                 __flush_dcache_icache(start);
437                 kunmap_atomic(start);
438         } else {
439                 __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
440         }
441 #endif
442 }
443 EXPORT_SYMBOL(flush_dcache_icache_page);
444 
445 void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
446 {
447         clear_page(page);
448 
449         /*
450          * We shouldn't have to do this, but some versions of glibc
451          * require it (ld.so assumes zero filled pages are icache clean)
452          * - Anton
453          */
454         flush_dcache_page(pg);
455 }
456 EXPORT_SYMBOL(clear_user_page);
457 
458 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
459                     struct page *pg)
460 {
461         copy_page(vto, vfrom);
462 
463         /*
464          * We should be able to use the following optimisation, however
465          * there are two problems.
466          * Firstly a bug in some versions of binutils meant PLT sections
467          * were not marked executable.
468          * Secondly the first word in the GOT section is blrl, used
469          * to establish the GOT address. Until recently the GOT was
470          * not marked executable.
471          * - Anton
472          */
473 #if 0
474         if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
475                 return;
476 #endif
477 
478         flush_dcache_page(pg);
479 }
480 
481 void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
482                              unsigned long addr, int len)
483 {
484         unsigned long maddr;
485 
486         maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
487         flush_icache_range(maddr, maddr + len);
488         kunmap(page);
489 }
490 EXPORT_SYMBOL(flush_icache_user_range);
491 
492 /*
493  * This is called at the end of handling a user page fault, when the
494  * fault has been handled by updating a PTE in the linux page tables.
495  * We use it to preload an HPTE into the hash table corresponding to
496  * the updated linux PTE.
497  * 
498  * This must always be called with the pte lock held.
499  */
500 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
501                       pte_t *ptep)
502 {
503 #ifdef CONFIG_PPC_STD_MMU
504         /*
505          * We don't need to worry about _PAGE_PRESENT here because we are
506          * called with either mm->page_table_lock held or ptl lock held
507          */
508         unsigned long access, trap;
509 
510         if (radix_enabled())
511                 return;
512 
513         /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
514         if (!pte_young(*ptep) || address >= TASK_SIZE)
515                 return;
516 
517         /* We try to figure out if we are coming from an instruction
518          * access fault and pass that down to __hash_page so we avoid
519          * double-faulting on execution of fresh text. We have to test
520          * for regs NULL since init will get here first thing at boot
521          *
522          * We also avoid filling the hash if not coming from a fault
523          */
524 
525         trap = current->thread.regs ? TRAP(current->thread.regs) : 0UL;
526         switch (trap) {
527         case 0x300:
528                 access = 0UL;
529                 break;
530         case 0x400:
531                 access = _PAGE_EXEC;
532                 break;
533         default:
534                 return;
535         }
536 
537         hash_preload(vma->vm_mm, address, access, trap);
538 #endif /* CONFIG_PPC_STD_MMU */
539 #if (defined(CONFIG_PPC_BOOK3E_64) || defined(CONFIG_PPC_FSL_BOOK3E)) \
540         && defined(CONFIG_HUGETLB_PAGE)
541         if (is_vm_hugetlb_page(vma))
542                 book3e_hugetlb_preload(vma, address, *ptep);
543 #endif
544 }
545 
546 /*
547  * System memory should not be in /proc/iomem but various tools expect it
548  * (eg kdump).
549  */
550 static int __init add_system_ram_resources(void)
551 {
552         struct memblock_region *reg;
553 
554         for_each_memblock(memory, reg) {
555                 struct resource *res;
556                 unsigned long base = reg->base;
557                 unsigned long size = reg->size;
558 
559                 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
560                 WARN_ON(!res);
561 
562                 if (res) {
563                         res->name = "System RAM";
564                         res->start = base;
565                         res->end = base + size - 1;
566                         res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
567                         WARN_ON(request_resource(&iomem_resource, res) < 0);
568                 }
569         }
570 
571         return 0;
572 }
573 subsys_initcall(add_system_ram_resources);
574 
575 #ifdef CONFIG_STRICT_DEVMEM
576 /*
577  * devmem_is_allowed(): check to see if /dev/mem access to a certain address
578  * is valid. The argument is a physical page number.
579  *
580  * Access has to be given to non-kernel-ram areas as well, these contain the
581  * PCI mmio resources as well as potential bios/acpi data regions.
582  */
583 int devmem_is_allowed(unsigned long pfn)
584 {
585         if (page_is_rtas_user_buf(pfn))
586                 return 1;
587         if (iomem_is_exclusive(PFN_PHYS(pfn)))
588                 return 0;
589         if (!page_is_ram(pfn))
590                 return 1;
591         return 0;
592 }
593 #endif /* CONFIG_STRICT_DEVMEM */
594 

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