e72590fa56
When __ioremap_caller() was replaced by ioremap_prot(), the __ref annotation added in commitaf1415314a("sh: Flag __ioremap_caller() __init_refok.") was removed, causing a modpost warning: WARNING: modpost: vmlinux: section mismatch in reference: ioremap_prot+0x88 (section: .text) -> ioremap_fixed (section: .init.text) ioremap_prot() calls ioremap_fixed() (which is marked __init), but only before mem_init_done becomes true, so this is safe. Hence fix this by re-adding the lost __ref. Link: https://lkml.kernel.org/r/20230911093850.1517389-1-geert+renesas@glider.be Fixes:0453c9a780("sh: mm: convert to GENERIC_IOREMAP") Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Baoquan He <bhe@redhat.com> Reviewed-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Cc: Rich Felker <dalias@libc.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
150 lines
3.9 KiB
C
150 lines
3.9 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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unsigned long prot)
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{
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void __iomem *mapped;
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pgprot_t pgprot = __pgprot(prot);
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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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