| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * PowerPC version |
| * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) |
| * |
| * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) |
| * and Cort Dougan (PReP) (cort@cs.nmt.edu) |
| * Copyright (C) 1996 Paul Mackerras |
| * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com) |
| * |
| * Derived from "arch/i386/mm/init.c" |
| * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds |
| */ |
| |
| #include <linux/export.h> |
| #include <linux/sched.h> |
| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/string.h> |
| #include <linux/gfp.h> |
| #include <linux/types.h> |
| #include <linux/mm.h> |
| #include <linux/stddef.h> |
| #include <linux/init.h> |
| #include <linux/memblock.h> |
| #include <linux/highmem.h> |
| #include <linux/initrd.h> |
| #include <linux/pagemap.h> |
| #include <linux/suspend.h> |
| #include <linux/hugetlb.h> |
| #include <linux/slab.h> |
| #include <linux/vmalloc.h> |
| #include <linux/memremap.h> |
| |
| #include <asm/pgalloc.h> |
| #include <asm/prom.h> |
| #include <asm/io.h> |
| #include <asm/mmu_context.h> |
| #include <asm/pgtable.h> |
| #include <asm/mmu.h> |
| #include <asm/smp.h> |
| #include <asm/machdep.h> |
| #include <asm/btext.h> |
| #include <asm/tlb.h> |
| #include <asm/sections.h> |
| #include <asm/sparsemem.h> |
| #include <asm/vdso.h> |
| #include <asm/fixmap.h> |
| #include <asm/swiotlb.h> |
| #include <asm/rtas.h> |
| |
| #include <mm/mmu_decl.h> |
| |
| #ifndef CPU_FTR_COHERENT_ICACHE |
| #define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */ |
| #define CPU_FTR_NOEXECUTE 0 |
| #endif |
| |
| unsigned long long memory_limit; |
| bool init_mem_is_free; |
| |
| #ifdef CONFIG_HIGHMEM |
| pte_t *kmap_pte; |
| EXPORT_SYMBOL(kmap_pte); |
| pgprot_t kmap_prot; |
| EXPORT_SYMBOL(kmap_prot); |
| |
| static inline pte_t *virt_to_kpte(unsigned long vaddr) |
| { |
| return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), |
| vaddr), vaddr), vaddr); |
| } |
| #endif |
| |
| pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
| unsigned long size, pgprot_t vma_prot) |
| { |
| if (ppc_md.phys_mem_access_prot) |
| return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot); |
| |
| if (!page_is_ram(pfn)) |
| vma_prot = pgprot_noncached(vma_prot); |
| |
| return vma_prot; |
| } |
| EXPORT_SYMBOL(phys_mem_access_prot); |
| |
| #ifdef CONFIG_MEMORY_HOTPLUG |
| |
| #ifdef CONFIG_NUMA |
| int memory_add_physaddr_to_nid(u64 start) |
| { |
| return hot_add_scn_to_nid(start); |
| } |
| #endif |
| |
| int __weak create_section_mapping(unsigned long start, unsigned long end, int nid) |
| { |
| return -ENODEV; |
| } |
| |
| int __weak remove_section_mapping(unsigned long start, unsigned long end) |
| { |
| return -ENODEV; |
| } |
| |
| int __ref arch_add_memory(int nid, u64 start, u64 size, |
| struct mhp_restrictions *restrictions) |
| { |
| unsigned long start_pfn = start >> PAGE_SHIFT; |
| unsigned long nr_pages = size >> PAGE_SHIFT; |
| int rc; |
| |
| resize_hpt_for_hotplug(memblock_phys_mem_size()); |
| |
| start = (unsigned long)__va(start); |
| rc = create_section_mapping(start, start + size, nid); |
| if (rc) { |
| pr_warn("Unable to create mapping for hot added memory 0x%llx..0x%llx: %d\n", |
| start, start + size, rc); |
| return -EFAULT; |
| } |
| flush_dcache_range(start, start + size); |
| |
| return __add_pages(nid, start_pfn, nr_pages, restrictions); |
| } |
| |
| #ifdef CONFIG_MEMORY_HOTREMOVE |
| void __ref arch_remove_memory(int nid, u64 start, u64 size, |
| struct vmem_altmap *altmap) |
| { |
| unsigned long start_pfn = start >> PAGE_SHIFT; |
| unsigned long nr_pages = size >> PAGE_SHIFT; |
| struct page *page = pfn_to_page(start_pfn) + vmem_altmap_offset(altmap); |
| int ret; |
| |
| __remove_pages(page_zone(page), start_pfn, nr_pages, altmap); |
| |
| /* Remove htab bolted mappings for this section of memory */ |
| start = (unsigned long)__va(start); |
| flush_dcache_range(start, start + size); |
| ret = remove_section_mapping(start, start + size); |
| WARN_ON_ONCE(ret); |
| |
| /* Ensure all vmalloc mappings are flushed in case they also |
| * hit that section of memory |
| */ |
| vm_unmap_aliases(); |
| |
| if (resize_hpt_for_hotplug(memblock_phys_mem_size()) == -ENOSPC) |
| pr_warn("Hash collision while resizing HPT\n"); |
| } |
| #endif |
| #endif /* CONFIG_MEMORY_HOTPLUG */ |
| |
| #ifndef CONFIG_NEED_MULTIPLE_NODES |
| void __init mem_topology_setup(void) |
| { |
| max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; |
| min_low_pfn = MEMORY_START >> PAGE_SHIFT; |
| #ifdef CONFIG_HIGHMEM |
| max_low_pfn = lowmem_end_addr >> PAGE_SHIFT; |
| #endif |
| |
| /* Place all memblock_regions in the same node and merge contiguous |
| * memblock_regions |
| */ |
| memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0); |
| } |
| |
| void __init initmem_init(void) |
| { |
| /* XXX need to clip this if using highmem? */ |
| sparse_memory_present_with_active_regions(0); |
| sparse_init(); |
| } |
| |
| /* mark pages that don't exist as nosave */ |
| static int __init mark_nonram_nosave(void) |
| { |
| struct memblock_region *reg, *prev = NULL; |
| |
| for_each_memblock(memory, reg) { |
| if (prev && |
| memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg)) |
| register_nosave_region(memblock_region_memory_end_pfn(prev), |
| memblock_region_memory_base_pfn(reg)); |
| prev = reg; |
| } |
| return 0; |
| } |
| #else /* CONFIG_NEED_MULTIPLE_NODES */ |
| static int __init mark_nonram_nosave(void) |
| { |
| return 0; |
| } |
| #endif |
| |
| /* |
| * Zones usage: |
| * |
| * We setup ZONE_DMA to be 31-bits on all platforms and ZONE_NORMAL to be |
| * everything else. GFP_DMA32 page allocations automatically fall back to |
| * ZONE_DMA. |
| * |
| * By using 31-bit unconditionally, we can exploit ARCH_ZONE_DMA_BITS to |
| * inform the generic DMA mapping code. 32-bit only devices (if not handled |
| * by an IOMMU anyway) will take a first dip into ZONE_NORMAL and get |
| * otherwise served by ZONE_DMA. |
| */ |
| static unsigned long max_zone_pfns[MAX_NR_ZONES]; |
| |
| /* |
| * paging_init() sets up the page tables - in fact we've already done this. |
| */ |
| void __init paging_init(void) |
| { |
| unsigned long long total_ram = memblock_phys_mem_size(); |
| phys_addr_t top_of_ram = memblock_end_of_DRAM(); |
| |
| #ifdef CONFIG_PPC32 |
| unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1); |
| unsigned long end = __fix_to_virt(FIX_HOLE); |
| |
| for (; v < end; v += PAGE_SIZE) |
| map_kernel_page(v, 0, __pgprot(0)); /* XXX gross */ |
| #endif |
| |
| #ifdef CONFIG_HIGHMEM |
| map_kernel_page(PKMAP_BASE, 0, __pgprot(0)); /* XXX gross */ |
| pkmap_page_table = virt_to_kpte(PKMAP_BASE); |
| |
| kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); |
| kmap_prot = PAGE_KERNEL; |
| #endif /* CONFIG_HIGHMEM */ |
| |
| printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n", |
| (unsigned long long)top_of_ram, total_ram); |
| printk(KERN_DEBUG "Memory hole size: %ldMB\n", |
| (long int)((top_of_ram - total_ram) >> 20)); |
| |
| #ifdef CONFIG_ZONE_DMA |
| max_zone_pfns[ZONE_DMA] = min(max_low_pfn, |
| ((1UL << ARCH_ZONE_DMA_BITS) - 1) >> PAGE_SHIFT); |
| #endif |
| max_zone_pfns[ZONE_NORMAL] = max_low_pfn; |
| #ifdef CONFIG_HIGHMEM |
| max_zone_pfns[ZONE_HIGHMEM] = max_pfn; |
| #endif |
| |
| free_area_init_nodes(max_zone_pfns); |
| |
| mark_nonram_nosave(); |
| } |
| |
| void __init mem_init(void) |
| { |
| /* |
| * book3s is limited to 16 page sizes due to encoding this in |
| * a 4-bit field for slices. |
| */ |
| BUILD_BUG_ON(MMU_PAGE_COUNT > 16); |
| |
| #ifdef CONFIG_SWIOTLB |
| swiotlb_init(0); |
| #endif |
| |
| high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
| set_max_mapnr(max_pfn); |
| memblock_free_all(); |
| |
| #ifdef CONFIG_HIGHMEM |
| { |
| unsigned long pfn, highmem_mapnr; |
| |
| highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT; |
| for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { |
| phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT; |
| struct page *page = pfn_to_page(pfn); |
| if (!memblock_is_reserved(paddr)) |
| free_highmem_page(page); |
| } |
| } |
| #endif /* CONFIG_HIGHMEM */ |
| |
| #if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP) |
| /* |
| * If smp is enabled, next_tlbcam_idx is initialized in the cpu up |
| * functions.... do it here for the non-smp case. |
| */ |
| per_cpu(next_tlbcam_idx, smp_processor_id()) = |
| (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1; |
| #endif |
| |
| mem_init_print_info(NULL); |
| #ifdef CONFIG_PPC32 |
| pr_info("Kernel virtual memory layout:\n"); |
| #ifdef CONFIG_KASAN |
| pr_info(" * 0x%08lx..0x%08lx : kasan shadow mem\n", |
| KASAN_SHADOW_START, KASAN_SHADOW_END); |
| #endif |
| pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP); |
| #ifdef CONFIG_HIGHMEM |
| pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n", |
| PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP)); |
| #endif /* CONFIG_HIGHMEM */ |
| #ifdef CONFIG_NOT_COHERENT_CACHE |
| pr_info(" * 0x%08lx..0x%08lx : consistent mem\n", |
| IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE); |
| #endif /* CONFIG_NOT_COHERENT_CACHE */ |
| pr_info(" * 0x%08lx..0x%08lx : early ioremap\n", |
| ioremap_bot, IOREMAP_TOP); |
| pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n", |
| VMALLOC_START, VMALLOC_END); |
| #endif /* CONFIG_PPC32 */ |
| } |
| |
| void free_initmem(void) |
| { |
| ppc_md.progress = ppc_printk_progress; |
| mark_initmem_nx(); |
| init_mem_is_free = true; |
| free_initmem_default(POISON_FREE_INITMEM); |
| } |
| |
| /* |
| * This is called when a page has been modified by the kernel. |
| * It just marks the page as not i-cache clean. We do the i-cache |
| * flush later when the page is given to a user process, if necessary. |
| */ |
| void flush_dcache_page(struct page *page) |
| { |
| if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) |
| return; |
| /* avoid an atomic op if possible */ |
| if (test_bit(PG_arch_1, &page->flags)) |
| clear_bit(PG_arch_1, &page->flags); |
| } |
| EXPORT_SYMBOL(flush_dcache_page); |
| |
| void flush_dcache_icache_page(struct page *page) |
| { |
| #ifdef CONFIG_HUGETLB_PAGE |
| if (PageCompound(page)) { |
| flush_dcache_icache_hugepage(page); |
| return; |
| } |
| #endif |
| #if defined(CONFIG_PPC_8xx) || defined(CONFIG_PPC64) |
| /* On 8xx there is no need to kmap since highmem is not supported */ |
| __flush_dcache_icache(page_address(page)); |
| #else |
| if (IS_ENABLED(CONFIG_BOOKE) || sizeof(phys_addr_t) > sizeof(void *)) { |
| void *start = kmap_atomic(page); |
| __flush_dcache_icache(start); |
| kunmap_atomic(start); |
| } else { |
| __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); |
| } |
| #endif |
| } |
| EXPORT_SYMBOL(flush_dcache_icache_page); |
| |
| void clear_user_page(void *page, unsigned long vaddr, struct page *pg) |
| { |
| clear_page(page); |
| |
| /* |
| * We shouldn't have to do this, but some versions of glibc |
| * require it (ld.so assumes zero filled pages are icache clean) |
| * - Anton |
| */ |
| flush_dcache_page(pg); |
| } |
| EXPORT_SYMBOL(clear_user_page); |
| |
| void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, |
| struct page *pg) |
| { |
| copy_page(vto, vfrom); |
| |
| /* |
| * We should be able to use the following optimisation, however |
| * there are two problems. |
| * Firstly a bug in some versions of binutils meant PLT sections |
| * were not marked executable. |
| * Secondly the first word in the GOT section is blrl, used |
| * to establish the GOT address. Until recently the GOT was |
| * not marked executable. |
| * - Anton |
| */ |
| #if 0 |
| if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) |
| return; |
| #endif |
| |
| flush_dcache_page(pg); |
| } |
| |
| void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, |
| unsigned long addr, int len) |
| { |
| unsigned long maddr; |
| |
| maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); |
| flush_icache_range(maddr, maddr + len); |
| kunmap(page); |
| } |
| EXPORT_SYMBOL(flush_icache_user_range); |
| |
| /* |
| * This is called at the end of handling a user page fault, when the |
| * fault has been handled by updating a PTE in the linux page tables. |
| * We use it to preload an HPTE into the hash table corresponding to |
| * the updated linux PTE. |
| * |
| * This must always be called with the pte lock held. |
| */ |
| void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, |
| pte_t *ptep) |
| { |
| #ifdef CONFIG_PPC_BOOK3S |
| /* |
| * We don't need to worry about _PAGE_PRESENT here because we are |
| * called with either mm->page_table_lock held or ptl lock held |
| */ |
| unsigned long trap; |
| bool is_exec; |
| |
| if (radix_enabled()) { |
| prefetch((void *)address); |
| return; |
| } |
| |
| /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ |
| if (!pte_young(*ptep) || address >= TASK_SIZE) |
| return; |
| |
| /* We try to figure out if we are coming from an instruction |
| * access fault and pass that down to __hash_page so we avoid |
| * double-faulting on execution of fresh text. We have to test |
| * for regs NULL since init will get here first thing at boot |
| * |
| * We also avoid filling the hash if not coming from a fault |
| */ |
| |
| trap = current->thread.regs ? TRAP(current->thread.regs) : 0UL; |
| switch (trap) { |
| case 0x300: |
| is_exec = false; |
| break; |
| case 0x400: |
| is_exec = true; |
| break; |
| default: |
| return; |
| } |
| |
| hash_preload(vma->vm_mm, address, is_exec, trap); |
| #endif /* CONFIG_PPC_BOOK3S */ |
| #if (defined(CONFIG_PPC_BOOK3E_64) || defined(CONFIG_PPC_FSL_BOOK3E)) \ |
| && defined(CONFIG_HUGETLB_PAGE) |
| if (is_vm_hugetlb_page(vma)) |
| book3e_hugetlb_preload(vma, address, *ptep); |
| #endif |
| } |
| |
| /* |
| * System memory should not be in /proc/iomem but various tools expect it |
| * (eg kdump). |
| */ |
| static int __init add_system_ram_resources(void) |
| { |
| struct memblock_region *reg; |
| |
| for_each_memblock(memory, reg) { |
| struct resource *res; |
| unsigned long base = reg->base; |
| unsigned long size = reg->size; |
| |
| res = kzalloc(sizeof(struct resource), GFP_KERNEL); |
| WARN_ON(!res); |
| |
| if (res) { |
| res->name = "System RAM"; |
| res->start = base; |
| res->end = base + size - 1; |
| res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; |
| WARN_ON(request_resource(&iomem_resource, res) < 0); |
| } |
| } |
| |
| return 0; |
| } |
| subsys_initcall(add_system_ram_resources); |
| |
| #ifdef CONFIG_STRICT_DEVMEM |
| /* |
| * devmem_is_allowed(): check to see if /dev/mem access to a certain address |
| * is valid. The argument is a physical page number. |
| * |
| * Access has to be given to non-kernel-ram areas as well, these contain the |
| * PCI mmio resources as well as potential bios/acpi data regions. |
| */ |
| int devmem_is_allowed(unsigned long pfn) |
| { |
| if (page_is_rtas_user_buf(pfn)) |
| return 1; |
| if (iomem_is_exclusive(PFN_PHYS(pfn))) |
| return 0; |
| if (!page_is_ram(pfn)) |
| return 1; |
| return 0; |
| } |
| #endif /* CONFIG_STRICT_DEVMEM */ |
| |
| /* |
| * This is defined in kernel/resource.c but only powerpc needs to export it, for |
| * the EHEA driver. Drop this when drivers/net/ethernet/ibm/ehea is removed. |
| */ |
| EXPORT_SYMBOL_GPL(walk_system_ram_range); |