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86758b5048
ioremap_prot() currently accepts pgprot_val parameter as an unsigned long, thus implicitly assuming that pgprot_val and pgprot_t could never be bigger than unsigned long. But this assumption soon will not be true on arm64 when using D128 pgtables. In 128 bit page table configuration, unsigned long is 64 bit, but pgprot_t is 128 bit. Passing platform abstracted pgprot_t argument is better as compared to size based data types. Let's change the parameter to directly pass pgprot_t like another similar helper generic_ioremap_prot(). Without this change in place, D128 configuration does not work on arm64 as the top 64 bits gets silently stripped when passing the protection value to this function. Link: https://lkml.kernel.org/r/20250218101954.415331-1-anshuman.khandual@arm.com Signed-off-by: Ryan Roberts <ryan.roberts@arm.com> Co-developed-by: Anshuman Khandual <anshuman.khandual@arm.com> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> [arm64] Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
148 lines
3.8 KiB
C
148 lines
3.8 KiB
C
/*
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* arch/sh/mm/ioremap.c
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*
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* (C) Copyright 1995 1996 Linus Torvalds
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* (C) Copyright 2005 - 2010 Paul Mundt
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*
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* Re-map IO memory to kernel address space so that we can access it.
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* This is needed for high PCI addresses that aren't mapped in the
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* 640k-1MB IO memory area on PC's
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file "COPYING" in the main directory of this
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* archive for more details.
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*/
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#include <linux/vmalloc.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/pci.h>
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#include <linux/io.h>
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#include <asm/io_trapped.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm/addrspace.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#include <asm/mmu.h>
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#include "ioremap.h"
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/*
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* On 32-bit SH, we traditionally have the whole physical address space mapped
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* at all times (as MIPS does), so "ioremap()" and "iounmap()" do not need to do
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* anything but place the address in the proper segment. This is true for P1
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* and P2 addresses, as well as some P3 ones. However, most of the P3 addresses
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* and newer cores using extended addressing need to map through page tables, so
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* the ioremap() implementation becomes a bit more complicated.
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*/
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#ifdef CONFIG_29BIT
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static void __iomem *
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__ioremap_29bit(phys_addr_t offset, unsigned long size, pgprot_t prot)
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{
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phys_addr_t last_addr = offset + size - 1;
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/*
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* For P1 and P2 space this is trivial, as everything is already
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* mapped. Uncached access for P1 addresses are done through P2.
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* In the P3 case or for addresses outside of the 29-bit space,
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* mapping must be done by the PMB or by using page tables.
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*/
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if (likely(PXSEG(offset) < P3SEG && PXSEG(last_addr) < P3SEG)) {
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u64 flags = pgprot_val(prot);
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/*
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* Anything using the legacy PTEA space attributes needs
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* to be kicked down to page table mappings.
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*/
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if (unlikely(flags & _PAGE_PCC_MASK))
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return NULL;
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if (unlikely(flags & _PAGE_CACHABLE))
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return (void __iomem *)P1SEGADDR(offset);
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return (void __iomem *)P2SEGADDR(offset);
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}
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/* P4 above the store queues are always mapped. */
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if (unlikely(offset >= P3_ADDR_MAX))
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return (void __iomem *)P4SEGADDR(offset);
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return NULL;
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}
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#else
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#define __ioremap_29bit(offset, size, prot) NULL
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#endif /* CONFIG_29BIT */
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void __iomem __ref *ioremap_prot(phys_addr_t phys_addr, size_t size,
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pgprot_t pgprot)
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{
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void __iomem *mapped;
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mapped = __ioremap_trapped(phys_addr, size);
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if (mapped)
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return mapped;
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mapped = __ioremap_29bit(phys_addr, size, pgprot);
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if (mapped)
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return mapped;
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/*
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* If we can't yet use the regular approach, go the fixmap route.
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*/
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if (!mem_init_done)
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return ioremap_fixed(phys_addr, size, pgprot);
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/*
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* First try to remap through the PMB.
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* PMB entries are all pre-faulted.
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*/
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mapped = pmb_remap_caller(phys_addr, size, pgprot,
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__builtin_return_address(0));
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if (mapped && !IS_ERR(mapped))
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return mapped;
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return generic_ioremap_prot(phys_addr, size, pgprot);
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}
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EXPORT_SYMBOL(ioremap_prot);
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/*
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* Simple checks for non-translatable mappings.
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*/
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static inline int iomapping_nontranslatable(unsigned long offset)
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{
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#ifdef CONFIG_29BIT
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/*
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* In 29-bit mode this includes the fixed P1/P2 areas, as well as
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* parts of P3.
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*/
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if (PXSEG(offset) < P3SEG || offset >= P3_ADDR_MAX)
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return 1;
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#endif
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return 0;
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}
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void iounmap(volatile void __iomem *addr)
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{
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unsigned long vaddr = (unsigned long __force)addr;
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/*
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* Nothing to do if there is no translatable mapping.
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*/
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if (iomapping_nontranslatable(vaddr))
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return;
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/*
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* There's no VMA if it's from an early fixed mapping.
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*/
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if (iounmap_fixed((void __iomem *)addr) == 0)
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return;
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/*
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* If the PMB handled it, there's nothing else to do.
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*/
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if (pmb_unmap((void __iomem *)addr) == 0)
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return;
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generic_iounmap(addr);
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}
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EXPORT_SYMBOL(iounmap);
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