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![Christoph Hellwig](/assets/img/avatar_default.png)
This switches to using common code for the DMA allocations, including potential use of the CMA allocator if configured. Switching to the generic code enables DMA allocations from atomic context, which is required by the DMA API documentation, and also adds various other minor features drivers start relying upon. It also makes sure we have on tested code base for all architectures that require uncached pte bits for coherent DMA allocations. Another advantage is that consistent memory allocations now share the general vmalloc pool instead of needing an explicit careout from it. Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Christophe Leroy <christophe.leroy@c-s.fr> # tested on 8xx Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190814132230.31874-2-hch@lst.de
459 lines
12 KiB
C
459 lines
12 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/export.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/gfp.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/stddef.h>
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#include <linux/init.h>
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#include <linux/memblock.h>
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#include <linux/highmem.h>
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#include <linux/initrd.h>
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#include <linux/pagemap.h>
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#include <linux/suspend.h>
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#include <linux/hugetlb.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/memremap.h>
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#include <asm/pgalloc.h>
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#include <asm/prom.h>
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#include <asm/io.h>
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#include <asm/mmu_context.h>
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#include <asm/pgtable.h>
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#include <asm/mmu.h>
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#include <asm/smp.h>
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#include <asm/machdep.h>
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#include <asm/btext.h>
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#include <asm/tlb.h>
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#include <asm/sections.h>
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#include <asm/sparsemem.h>
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#include <asm/vdso.h>
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#include <asm/fixmap.h>
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#include <asm/swiotlb.h>
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#include <asm/rtas.h>
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#include <mm/mmu_decl.h>
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#ifndef CPU_FTR_COHERENT_ICACHE
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#define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */
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#define CPU_FTR_NOEXECUTE 0
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#endif
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unsigned long long memory_limit;
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bool init_mem_is_free;
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#ifdef CONFIG_HIGHMEM
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pte_t *kmap_pte;
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EXPORT_SYMBOL(kmap_pte);
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pgprot_t kmap_prot;
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EXPORT_SYMBOL(kmap_prot);
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static inline pte_t *virt_to_kpte(unsigned long vaddr)
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{
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return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
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vaddr), vaddr), vaddr);
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}
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#endif
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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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#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, int nid)
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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_add_memory(int nid, u64 start, u64 size,
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struct mhp_restrictions *restrictions)
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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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resize_hpt_for_hotplug(memblock_phys_mem_size());
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start = (unsigned long)__va(start);
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rc = create_section_mapping(start, start + size, nid);
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if (rc) {
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pr_warn("Unable to create mapping for hot added memory 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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flush_dcache_range(start, start + size);
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return __add_pages(nid, start_pfn, nr_pages, restrictions);
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}
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void __ref arch_remove_memory(int nid, u64 start, u64 size,
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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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struct page *page = pfn_to_page(start_pfn) + vmem_altmap_offset(altmap);
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int ret;
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__remove_pages(page_zone(page), start_pfn, nr_pages, altmap);
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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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flush_dcache_range(start, start + size);
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ret = remove_section_mapping(start, start + size);
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WARN_ON_ONCE(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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if (resize_hpt_for_hotplug(memblock_phys_mem_size()) == -ENOSPC)
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pr_warn("Hash collision while resizing HPT\n");
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}
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#endif
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#ifndef CONFIG_NEED_MULTIPLE_NODES
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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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/* XXX need to clip this if using highmem? */
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sparse_memory_present_with_active_regions(0);
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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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struct memblock_region *reg, *prev = NULL;
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for_each_memblock(memory, reg) {
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if (prev &&
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memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg))
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register_nosave_region(memblock_region_memory_end_pfn(prev),
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memblock_region_memory_base_pfn(reg));
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prev = reg;
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}
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return 0;
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}
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#else /* CONFIG_NEED_MULTIPLE_NODES */
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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 ARCH_ZONE_DMA_BITS to
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* inform the generic DMA mapping code. 32-bit only devices (if not handled
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* by an IOMMU anyway) will take a first dip into ZONE_NORMAL and get
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* otherwise served by 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_PPC32
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unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1);
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unsigned long end = __fix_to_virt(FIX_HOLE);
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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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#endif
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#ifdef CONFIG_HIGHMEM
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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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kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
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kmap_prot = PAGE_KERNEL;
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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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#ifdef CONFIG_ZONE_DMA
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max_zone_pfns[ZONE_DMA] = min(max_low_pfn,
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1UL << (ARCH_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_nodes(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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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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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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mem_init_print_info(NULL);
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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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#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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init_mem_is_free = true;
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free_initmem_default(POISON_FREE_INITMEM);
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}
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/*
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* This is called when a page has been modified by the kernel.
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* It just marks the page as not i-cache clean. We do the i-cache
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* flush later when the page is given to a user process, if necessary.
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*/
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void flush_dcache_page(struct page *page)
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{
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if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
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return;
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/* avoid an atomic op if possible */
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if (test_bit(PG_arch_1, &page->flags))
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clear_bit(PG_arch_1, &page->flags);
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}
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EXPORT_SYMBOL(flush_dcache_page);
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void flush_dcache_icache_page(struct page *page)
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{
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#ifdef CONFIG_HUGETLB_PAGE
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if (PageCompound(page)) {
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flush_dcache_icache_hugepage(page);
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return;
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}
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#endif
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#if defined(CONFIG_PPC_8xx) || defined(CONFIG_PPC64)
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/* On 8xx there is no need to kmap since highmem is not supported */
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__flush_dcache_icache(page_address(page));
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#else
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if (IS_ENABLED(CONFIG_BOOKE) || sizeof(phys_addr_t) > sizeof(void *)) {
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void *start = kmap_atomic(page);
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__flush_dcache_icache(start);
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kunmap_atomic(start);
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} else {
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__flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
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}
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#endif
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}
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EXPORT_SYMBOL(flush_dcache_icache_page);
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void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
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{
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clear_page(page);
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/*
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* We shouldn't have to do this, but some versions of glibc
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* require it (ld.so assumes zero filled pages are icache clean)
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* - Anton
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*/
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flush_dcache_page(pg);
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}
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EXPORT_SYMBOL(clear_user_page);
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void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
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struct page *pg)
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{
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copy_page(vto, vfrom);
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/*
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* We should be able to use the following optimisation, however
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* there are two problems.
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* Firstly a bug in some versions of binutils meant PLT sections
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* were not marked executable.
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* Secondly the first word in the GOT section is blrl, used
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* to establish the GOT address. Until recently the GOT was
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* not marked executable.
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* - Anton
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*/
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#if 0
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if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
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return;
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#endif
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flush_dcache_page(pg);
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}
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void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
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unsigned long addr, int len)
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{
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unsigned long maddr;
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maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
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flush_icache_range(maddr, maddr + len);
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kunmap(page);
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}
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EXPORT_SYMBOL(flush_icache_user_range);
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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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struct memblock_region *reg;
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for_each_memblock(memory, reg) {
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struct resource *res;
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unsigned long base = reg->base;
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unsigned long size = reg->size;
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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 = base;
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res->end = base + size - 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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