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8d05554dca
By taking GENERIC_IOREMAP method, the generic generic_ioremap_prot(), generic_iounmap(), and their generic wrapper ioremap_prot(), ioremap() and iounmap() are all visible and available to arch. Arch needs to provide wrapper functions to override the generic versions if there's arch specific handling in its ioremap_prot(), ioremap() or iounmap(). This change will simplify implementation by removing duplicated code with generic_ioremap_prot() and generic_iounmap(), and has the equivalent functioality as before. Here, add wrapper functions ioremap_prot() and iounmap() for powerpc's special operation when ioremap() and iounmap(). Link: https://lkml.kernel.org/r/20230706154520.11257-18-bhe@redhat.com Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Baoquan He <bhe@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Brian Cain <bcain@quicinc.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Chris Zankel <chris@zankel.net> Cc: David Laight <David.Laight@ACULAB.COM> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Cc: Jonas Bonn <jonas@southpole.se> Cc: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Nathan Chancellor <nathan@kernel.org> Cc: Niklas Schnelle <schnelle@linux.ibm.com> Cc: Rich Felker <dalias@libc.org> Cc: Stafford Horne <shorne@gmail.com> Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Vineet Gupta <vgupta@kernel.org> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
92 lines
2.2 KiB
C
92 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <mm/mmu_decl.h>
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void __iomem *ioremap_wt(phys_addr_t addr, unsigned long size)
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{
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pgprot_t prot = pgprot_cached_wthru(PAGE_KERNEL);
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return __ioremap_caller(addr, size, prot, __builtin_return_address(0));
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}
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EXPORT_SYMBOL(ioremap_wt);
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void __iomem *
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__ioremap_caller(phys_addr_t addr, unsigned long size, pgprot_t prot, void *caller)
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{
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unsigned long v;
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phys_addr_t p, offset;
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int err;
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/*
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* If the address lies within the first 16 MB, assume it's in ISA
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* memory space
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*/
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if (addr < SZ_16M)
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addr += _ISA_MEM_BASE;
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/*
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* Choose an address to map it to.
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* Once the vmalloc system is running, we use it.
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* Before then, we use space going down from IOREMAP_TOP
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* (ioremap_bot records where we're up to).
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*/
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p = addr & PAGE_MASK;
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offset = addr & ~PAGE_MASK;
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size = PAGE_ALIGN(addr + size) - p;
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#ifndef CONFIG_CRASH_DUMP
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/*
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* Don't allow anybody to remap normal RAM that we're using.
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* mem_init() sets high_memory so only do the check after that.
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*/
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if (slab_is_available() && p <= virt_to_phys(high_memory - 1) &&
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page_is_ram(__phys_to_pfn(p))) {
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pr_warn("%s(): phys addr 0x%llx is RAM lr %ps\n", __func__,
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(unsigned long long)p, __builtin_return_address(0));
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return NULL;
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}
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#endif
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if (size == 0)
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return NULL;
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/*
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* Is it already mapped? Perhaps overlapped by a previous
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* mapping.
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*/
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v = p_block_mapped(p);
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if (v)
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return (void __iomem *)v + offset;
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if (slab_is_available())
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return generic_ioremap_prot(addr, size, prot);
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/*
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* Should check if it is a candidate for a BAT mapping
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*/
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pr_warn("ioremap() called early from %pS. Use early_ioremap() instead\n", caller);
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err = early_ioremap_range(ioremap_bot - size - PAGE_SIZE, p, size, prot);
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if (err)
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return NULL;
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ioremap_bot -= size + PAGE_SIZE;
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return (void __iomem *)ioremap_bot + offset;
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}
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void iounmap(volatile void __iomem *addr)
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{
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/*
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* If mapped by BATs then there is nothing to do.
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* Calling vfree() generates a benign warning.
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*/
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if (v_block_mapped((unsigned long)addr))
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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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