408 lines
10 KiB
C
408 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* PowerPC version
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
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* and Cort Dougan (PReP) (cort@cs.nmt.edu)
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* Copyright (C) 1996 Paul Mackerras
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* PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
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*
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* Derived from "arch/i386/mm/init.c"
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* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
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*/
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#include <linux/memblock.h>
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#include <linux/highmem.h>
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#include <linux/suspend.h>
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#include <linux/dma-direct.h>
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#include <asm/machdep.h>
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#include <asm/rtas.h>
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#include <asm/kasan.h>
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#include <asm/svm.h>
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#include <asm/mmzone.h>
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#include <asm/ftrace.h>
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#include <mm/mmu_decl.h>
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unsigned long long memory_limit;
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unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss;
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EXPORT_SYMBOL(empty_zero_page);
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pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
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unsigned long size, pgprot_t vma_prot)
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{
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if (ppc_md.phys_mem_access_prot)
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return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
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if (!page_is_ram(pfn))
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vma_prot = pgprot_noncached(vma_prot);
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return vma_prot;
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}
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EXPORT_SYMBOL(phys_mem_access_prot);
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#ifdef CONFIG_MEMORY_HOTPLUG
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static DEFINE_MUTEX(linear_mapping_mutex);
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#ifdef CONFIG_NUMA
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int memory_add_physaddr_to_nid(u64 start)
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{
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return hot_add_scn_to_nid(start);
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}
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#endif
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int __weak create_section_mapping(unsigned long start, unsigned long end,
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int nid, pgprot_t prot)
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{
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return -ENODEV;
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}
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int __weak remove_section_mapping(unsigned long start, unsigned long end)
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{
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return -ENODEV;
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}
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int __ref arch_create_linear_mapping(int nid, u64 start, u64 size,
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struct mhp_params *params)
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{
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int rc;
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start = (unsigned long)__va(start);
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mutex_lock(&linear_mapping_mutex);
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rc = create_section_mapping(start, start + size, nid,
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params->pgprot);
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mutex_unlock(&linear_mapping_mutex);
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if (rc) {
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pr_warn("Unable to create linear mapping for 0x%llx..0x%llx: %d\n",
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start, start + size, rc);
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return -EFAULT;
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}
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return 0;
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}
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void __ref arch_remove_linear_mapping(u64 start, u64 size)
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{
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int ret;
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/* Remove htab bolted mappings for this section of memory */
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start = (unsigned long)__va(start);
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mutex_lock(&linear_mapping_mutex);
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ret = remove_section_mapping(start, start + size);
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mutex_unlock(&linear_mapping_mutex);
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if (ret)
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pr_warn("Unable to remove linear mapping for 0x%llx..0x%llx: %d\n",
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start, start + size, ret);
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/* Ensure all vmalloc mappings are flushed in case they also
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* hit that section of memory
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*/
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vm_unmap_aliases();
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}
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/*
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* After memory hotplug the variables max_pfn, max_low_pfn and high_memory need
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* updating.
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*/
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static void update_end_of_memory_vars(u64 start, u64 size)
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{
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unsigned long end_pfn = PFN_UP(start + size);
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if (end_pfn > max_pfn) {
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max_pfn = end_pfn;
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max_low_pfn = end_pfn;
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high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
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}
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}
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int __ref add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
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struct mhp_params *params)
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{
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int ret;
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ret = __add_pages(nid, start_pfn, nr_pages, params);
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if (ret)
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return ret;
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/* update max_pfn, max_low_pfn and high_memory */
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update_end_of_memory_vars(start_pfn << PAGE_SHIFT,
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nr_pages << PAGE_SHIFT);
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return ret;
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}
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int __ref arch_add_memory(int nid, u64 start, u64 size,
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struct mhp_params *params)
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{
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unsigned long start_pfn = start >> PAGE_SHIFT;
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unsigned long nr_pages = size >> PAGE_SHIFT;
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int rc;
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rc = arch_create_linear_mapping(nid, start, size, params);
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if (rc)
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return rc;
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rc = add_pages(nid, start_pfn, nr_pages, params);
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if (rc)
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arch_remove_linear_mapping(start, size);
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return rc;
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}
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void __ref arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
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{
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unsigned long start_pfn = start >> PAGE_SHIFT;
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unsigned long nr_pages = size >> PAGE_SHIFT;
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__remove_pages(start_pfn, nr_pages, altmap);
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arch_remove_linear_mapping(start, size);
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}
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#endif
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#ifndef CONFIG_NUMA
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void __init mem_topology_setup(void)
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{
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max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
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min_low_pfn = MEMORY_START >> PAGE_SHIFT;
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#ifdef CONFIG_HIGHMEM
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max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
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#endif
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/* Place all memblock_regions in the same node and merge contiguous
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* memblock_regions
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*/
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memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
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}
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void __init initmem_init(void)
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{
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sparse_init();
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}
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/* mark pages that don't exist as nosave */
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static int __init mark_nonram_nosave(void)
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{
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unsigned long spfn, epfn, prev = 0;
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int i;
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for_each_mem_pfn_range(i, MAX_NUMNODES, &spfn, &epfn, NULL) {
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if (prev && prev < spfn)
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register_nosave_region(prev, spfn);
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prev = epfn;
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}
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return 0;
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}
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#else /* CONFIG_NUMA */
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static int __init mark_nonram_nosave(void)
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{
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return 0;
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}
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#endif
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/*
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* Zones usage:
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*
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* We setup ZONE_DMA to be 31-bits on all platforms and ZONE_NORMAL to be
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* everything else. GFP_DMA32 page allocations automatically fall back to
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* ZONE_DMA.
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*
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* By using 31-bit unconditionally, we can exploit zone_dma_bits to inform the
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* generic DMA mapping code. 32-bit only devices (if not handled by an IOMMU
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* anyway) will take a first dip into ZONE_NORMAL and get otherwise served by
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* ZONE_DMA.
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*/
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static unsigned long max_zone_pfns[MAX_NR_ZONES];
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/*
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* paging_init() sets up the page tables - in fact we've already done this.
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*/
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void __init paging_init(void)
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{
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unsigned long long total_ram = memblock_phys_mem_size();
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phys_addr_t top_of_ram = memblock_end_of_DRAM();
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#ifdef CONFIG_HIGHMEM
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unsigned long v = __fix_to_virt(FIX_KMAP_END);
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unsigned long end = __fix_to_virt(FIX_KMAP_BEGIN);
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for (; v < end; v += PAGE_SIZE)
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map_kernel_page(v, 0, __pgprot(0)); /* XXX gross */
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map_kernel_page(PKMAP_BASE, 0, __pgprot(0)); /* XXX gross */
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pkmap_page_table = virt_to_kpte(PKMAP_BASE);
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#endif /* CONFIG_HIGHMEM */
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printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n",
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(unsigned long long)top_of_ram, total_ram);
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printk(KERN_DEBUG "Memory hole size: %ldMB\n",
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(long int)((top_of_ram - total_ram) >> 20));
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/*
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* Allow 30-bit DMA for very limited Broadcom wifi chips on many
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* powerbooks.
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*/
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if (IS_ENABLED(CONFIG_PPC32))
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zone_dma_bits = 30;
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else
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zone_dma_bits = 31;
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#ifdef CONFIG_ZONE_DMA
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max_zone_pfns[ZONE_DMA] = min(max_low_pfn,
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1UL << (zone_dma_bits - PAGE_SHIFT));
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#endif
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max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
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#ifdef CONFIG_HIGHMEM
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max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
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#endif
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free_area_init(max_zone_pfns);
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mark_nonram_nosave();
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}
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void __init mem_init(void)
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{
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/*
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* book3s is limited to 16 page sizes due to encoding this in
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* a 4-bit field for slices.
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*/
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BUILD_BUG_ON(MMU_PAGE_COUNT > 16);
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#ifdef CONFIG_SWIOTLB
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/*
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* Some platforms (e.g. 85xx) limit DMA-able memory way below
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* 4G. We force memblock to bottom-up mode to ensure that the
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* memory allocated in swiotlb_init() is DMA-able.
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* As it's the last memblock allocation, no need to reset it
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* back to to-down.
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*/
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memblock_set_bottom_up(true);
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if (is_secure_guest())
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svm_swiotlb_init();
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else
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swiotlb_init(0);
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#endif
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high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
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set_max_mapnr(max_pfn);
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kasan_late_init();
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memblock_free_all();
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#ifdef CONFIG_HIGHMEM
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{
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unsigned long pfn, highmem_mapnr;
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highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
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for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
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phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT;
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struct page *page = pfn_to_page(pfn);
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if (!memblock_is_reserved(paddr))
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free_highmem_page(page);
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}
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}
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#endif /* CONFIG_HIGHMEM */
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#if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP)
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/*
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* If smp is enabled, next_tlbcam_idx is initialized in the cpu up
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* functions.... do it here for the non-smp case.
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*/
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per_cpu(next_tlbcam_idx, smp_processor_id()) =
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(mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
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#endif
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#ifdef CONFIG_PPC32
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pr_info("Kernel virtual memory layout:\n");
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#ifdef CONFIG_KASAN
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pr_info(" * 0x%08lx..0x%08lx : kasan shadow mem\n",
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KASAN_SHADOW_START, KASAN_SHADOW_END);
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#endif
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pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
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#ifdef CONFIG_HIGHMEM
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pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
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PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
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#endif /* CONFIG_HIGHMEM */
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if (ioremap_bot != IOREMAP_TOP)
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pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
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ioremap_bot, IOREMAP_TOP);
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pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
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VMALLOC_START, VMALLOC_END);
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#ifdef MODULES_VADDR
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pr_info(" * 0x%08lx..0x%08lx : modules\n",
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MODULES_VADDR, MODULES_END);
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#endif
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#endif /* CONFIG_PPC32 */
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}
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void free_initmem(void)
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{
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ppc_md.progress = ppc_printk_progress;
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mark_initmem_nx();
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free_initmem_default(POISON_FREE_INITMEM);
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ftrace_free_init_tramp();
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}
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/*
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* System memory should not be in /proc/iomem but various tools expect it
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* (eg kdump).
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*/
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static int __init add_system_ram_resources(void)
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{
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phys_addr_t start, end;
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u64 i;
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for_each_mem_range(i, &start, &end) {
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struct resource *res;
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res = kzalloc(sizeof(struct resource), GFP_KERNEL);
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WARN_ON(!res);
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if (res) {
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res->name = "System RAM";
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res->start = start;
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/*
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* In memblock, end points to the first byte after
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* the range while in resourses, end points to the
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* last byte in the range.
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*/
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res->end = end - 1;
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res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
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WARN_ON(request_resource(&iomem_resource, res) < 0);
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}
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}
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return 0;
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}
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subsys_initcall(add_system_ram_resources);
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#ifdef CONFIG_STRICT_DEVMEM
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/*
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* devmem_is_allowed(): check to see if /dev/mem access to a certain address
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* is valid. The argument is a physical page number.
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*
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* Access has to be given to non-kernel-ram areas as well, these contain the
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* PCI mmio resources as well as potential bios/acpi data regions.
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*/
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int devmem_is_allowed(unsigned long pfn)
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{
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if (page_is_rtas_user_buf(pfn))
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return 1;
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if (iomem_is_exclusive(PFN_PHYS(pfn)))
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return 0;
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if (!page_is_ram(pfn))
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return 1;
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return 0;
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}
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#endif /* CONFIG_STRICT_DEVMEM */
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/*
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* This is defined in kernel/resource.c but only powerpc needs to export it, for
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* the EHEA driver. Drop this when drivers/net/ethernet/ibm/ehea is removed.
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*/
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EXPORT_SYMBOL_GPL(walk_system_ram_range);
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