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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
116 lines
3 KiB
C
116 lines
3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright © 2008 Ingo Molnar
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*/
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#include <asm/iomap.h>
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#include <asm/pat.h>
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#include <linux/export.h>
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#include <linux/highmem.h>
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static int is_io_mapping_possible(resource_size_t base, unsigned long size)
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{
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#if !defined(CONFIG_X86_PAE) && defined(CONFIG_PHYS_ADDR_T_64BIT)
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/* There is no way to map greater than 1 << 32 address without PAE */
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if (base + size > 0x100000000ULL)
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return 0;
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#endif
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return 1;
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}
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int iomap_create_wc(resource_size_t base, unsigned long size, pgprot_t *prot)
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{
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enum page_cache_mode pcm = _PAGE_CACHE_MODE_WC;
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int ret;
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if (!is_io_mapping_possible(base, size))
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return -EINVAL;
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ret = io_reserve_memtype(base, base + size, &pcm);
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if (ret)
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return ret;
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*prot = __pgprot(__PAGE_KERNEL | cachemode2protval(pcm));
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/* Filter out unsupported __PAGE_KERNEL* bits: */
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pgprot_val(*prot) &= __default_kernel_pte_mask;
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return 0;
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}
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EXPORT_SYMBOL_GPL(iomap_create_wc);
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void iomap_free(resource_size_t base, unsigned long size)
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{
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io_free_memtype(base, base + size);
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}
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EXPORT_SYMBOL_GPL(iomap_free);
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void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot)
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{
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unsigned long vaddr;
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int idx, type;
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preempt_disable();
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pagefault_disable();
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type = kmap_atomic_idx_push();
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idx = type + KM_TYPE_NR * smp_processor_id();
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vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
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set_pte(kmap_pte - idx, pfn_pte(pfn, prot));
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arch_flush_lazy_mmu_mode();
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return (void *)vaddr;
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}
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/*
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* Map 'pfn' using protections 'prot'
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*/
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void __iomem *
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iomap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot)
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{
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/*
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* For non-PAT systems, translate non-WB request to UC- just in
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* case the caller set the PWT bit to prot directly without using
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* pgprot_writecombine(). UC- translates to uncached if the MTRR
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* is UC or WC. UC- gets the real intention, of the user, which is
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* "WC if the MTRR is WC, UC if you can't do that."
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*/
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if (!pat_enabled() && pgprot2cachemode(prot) != _PAGE_CACHE_MODE_WB)
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prot = __pgprot(__PAGE_KERNEL |
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cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS));
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/* Filter out unsupported __PAGE_KERNEL* bits: */
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pgprot_val(prot) &= __default_kernel_pte_mask;
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return (void __force __iomem *) kmap_atomic_prot_pfn(pfn, prot);
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}
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EXPORT_SYMBOL_GPL(iomap_atomic_prot_pfn);
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void
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iounmap_atomic(void __iomem *kvaddr)
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{
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unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
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if (vaddr >= __fix_to_virt(FIX_KMAP_END) &&
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vaddr <= __fix_to_virt(FIX_KMAP_BEGIN)) {
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int idx, type;
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type = kmap_atomic_idx();
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idx = type + KM_TYPE_NR * smp_processor_id();
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#ifdef CONFIG_DEBUG_HIGHMEM
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WARN_ON_ONCE(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
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#endif
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/*
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* Force other mappings to Oops if they'll try to access this
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* pte without first remap it. Keeping stale mappings around
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* is a bad idea also, in case the page changes cacheability
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* attributes or becomes a protected page in a hypervisor.
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*/
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kpte_clear_flush(kmap_pte-idx, vaddr);
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kmap_atomic_idx_pop();
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}
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pagefault_enable();
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preempt_enable();
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}
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EXPORT_SYMBOL_GPL(iounmap_atomic);
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