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ca5999fde0
The include/linux/pgtable.h is going to be the home of generic page table manipulation functions. Start with moving asm-generic/pgtable.h to include/linux/pgtable.h and make the latter include asm/pgtable.h. Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Cain <bcain@codeaurora.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Zankel <chris@zankel.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Mark Salter <msalter@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Nick Hu <nickhu@andestech.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vincent Chen <deanbo422@gmail.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: http://lkml.kernel.org/r/20200514170327.31389-3-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
189 lines
3.7 KiB
C
189 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright © 2008 Keith Packard <keithp@keithp.com>
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*/
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#ifndef _LINUX_IO_MAPPING_H
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#define _LINUX_IO_MAPPING_H
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/bug.h>
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#include <linux/io.h>
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#include <asm/page.h>
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/*
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* The io_mapping mechanism provides an abstraction for mapping
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* individual pages from an io device to the CPU in an efficient fashion.
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*
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* See Documentation/driver-api/io-mapping.rst
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*/
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struct io_mapping {
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resource_size_t base;
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unsigned long size;
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pgprot_t prot;
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void __iomem *iomem;
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};
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#ifdef CONFIG_HAVE_ATOMIC_IOMAP
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#include <linux/pfn.h>
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#include <asm/iomap.h>
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/*
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* For small address space machines, mapping large objects
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* into the kernel virtual space isn't practical. Where
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* available, use fixmap support to dynamically map pages
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* of the object at run time.
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*/
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static inline struct io_mapping *
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io_mapping_init_wc(struct io_mapping *iomap,
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resource_size_t base,
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unsigned long size)
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{
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pgprot_t prot;
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if (iomap_create_wc(base, size, &prot))
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return NULL;
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iomap->base = base;
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iomap->size = size;
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iomap->prot = prot;
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return iomap;
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}
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static inline void
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io_mapping_fini(struct io_mapping *mapping)
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{
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iomap_free(mapping->base, mapping->size);
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}
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/* Atomic map/unmap */
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static inline void __iomem *
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io_mapping_map_atomic_wc(struct io_mapping *mapping,
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unsigned long offset)
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{
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resource_size_t phys_addr;
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BUG_ON(offset >= mapping->size);
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phys_addr = mapping->base + offset;
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return iomap_atomic_prot_pfn(PHYS_PFN(phys_addr), mapping->prot);
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}
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static inline void
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io_mapping_unmap_atomic(void __iomem *vaddr)
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{
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iounmap_atomic(vaddr);
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}
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static inline void __iomem *
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io_mapping_map_wc(struct io_mapping *mapping,
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unsigned long offset,
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unsigned long size)
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{
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resource_size_t phys_addr;
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BUG_ON(offset >= mapping->size);
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phys_addr = mapping->base + offset;
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return ioremap_wc(phys_addr, size);
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}
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static inline void
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io_mapping_unmap(void __iomem *vaddr)
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{
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iounmap(vaddr);
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}
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#else
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#include <linux/uaccess.h>
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#include <linux/pgtable.h>
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/* Create the io_mapping object*/
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static inline struct io_mapping *
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io_mapping_init_wc(struct io_mapping *iomap,
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resource_size_t base,
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unsigned long size)
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{
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iomap->base = base;
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iomap->size = size;
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iomap->iomem = ioremap_wc(base, size);
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#if defined(pgprot_noncached_wc) /* archs can't agree on a name ... */
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iomap->prot = pgprot_noncached_wc(PAGE_KERNEL);
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#elif defined(pgprot_writecombine)
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iomap->prot = pgprot_writecombine(PAGE_KERNEL);
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#else
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iomap->prot = pgprot_noncached(PAGE_KERNEL);
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#endif
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return iomap;
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}
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static inline void
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io_mapping_fini(struct io_mapping *mapping)
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{
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iounmap(mapping->iomem);
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}
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/* Non-atomic map/unmap */
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static inline void __iomem *
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io_mapping_map_wc(struct io_mapping *mapping,
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unsigned long offset,
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unsigned long size)
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{
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return mapping->iomem + offset;
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}
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static inline void
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io_mapping_unmap(void __iomem *vaddr)
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{
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}
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/* Atomic map/unmap */
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static inline void __iomem *
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io_mapping_map_atomic_wc(struct io_mapping *mapping,
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unsigned long offset)
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{
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preempt_disable();
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pagefault_disable();
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return io_mapping_map_wc(mapping, offset, PAGE_SIZE);
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}
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static inline void
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io_mapping_unmap_atomic(void __iomem *vaddr)
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{
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io_mapping_unmap(vaddr);
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pagefault_enable();
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preempt_enable();
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}
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#endif /* HAVE_ATOMIC_IOMAP */
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static inline struct io_mapping *
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io_mapping_create_wc(resource_size_t base,
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unsigned long size)
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{
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struct io_mapping *iomap;
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iomap = kmalloc(sizeof(*iomap), GFP_KERNEL);
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if (!iomap)
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return NULL;
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if (!io_mapping_init_wc(iomap, base, size)) {
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kfree(iomap);
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return NULL;
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}
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return iomap;
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}
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static inline void
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io_mapping_free(struct io_mapping *iomap)
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{
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io_mapping_fini(iomap);
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kfree(iomap);
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}
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#endif /* _LINUX_IO_MAPPING_H */
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