JFIF$        dd7 

Viewing File: /usr/src/kernels/5.14.0-570.32.1.el9_6.x86_64/include/linux/io-mapping.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright © 2008 Keith Packard <keithp@keithp.com>
 */

#ifndef _LINUX_IO_MAPPING_H
#define _LINUX_IO_MAPPING_H

#include <linux/types.h>
#include <linux/slab.h>
#include <linux/bug.h>
#include <linux/io.h>
#include <linux/pgtable.h>
#include <asm/page.h>

/*
 * The io_mapping mechanism provides an abstraction for mapping
 * individual pages from an io device to the CPU in an efficient fashion.
 *
 * See Documentation/driver-api/io-mapping.rst
 */

struct io_mapping {
	resource_size_t base;
	unsigned long size;
	pgprot_t prot;
	void __iomem *iomem;
};

#ifdef CONFIG_HAVE_ATOMIC_IOMAP

#include <linux/pfn.h>
#include <asm/iomap.h>
/*
 * For small address space machines, mapping large objects
 * into the kernel virtual space isn't practical. Where
 * available, use fixmap support to dynamically map pages
 * of the object at run time.
 */

static inline struct io_mapping *
io_mapping_init_wc(struct io_mapping *iomap,
		   resource_size_t base,
		   unsigned long size)
{
	pgprot_t prot;

	if (iomap_create_wc(base, size, &prot))
		return NULL;

	iomap->base = base;
	iomap->size = size;
	iomap->prot = prot;
	return iomap;
}

static inline void
io_mapping_fini(struct io_mapping *mapping)
{
	iomap_free(mapping->base, mapping->size);
}

/* Atomic map/unmap */
static inline void __iomem *
io_mapping_map_atomic_wc(struct io_mapping *mapping,
			 unsigned long offset)
{
	resource_size_t phys_addr;

	BUG_ON(offset >= mapping->size);
	phys_addr = mapping->base + offset;
	preempt_disable();
	pagefault_disable();
	return __iomap_local_pfn_prot(PHYS_PFN(phys_addr), mapping->prot);
}

static inline void
io_mapping_unmap_atomic(void __iomem *vaddr)
{
	kunmap_local_indexed((void __force *)vaddr);
	pagefault_enable();
	preempt_enable();
}

static inline void __iomem *
io_mapping_map_local_wc(struct io_mapping *mapping, unsigned long offset)
{
	resource_size_t phys_addr;

	BUG_ON(offset >= mapping->size);
	phys_addr = mapping->base + offset;
	return __iomap_local_pfn_prot(PHYS_PFN(phys_addr), mapping->prot);
}

static inline void io_mapping_unmap_local(void __iomem *vaddr)
{
	kunmap_local_indexed((void __force *)vaddr);
}

static inline void __iomem *
io_mapping_map_wc(struct io_mapping *mapping,
		  unsigned long offset,
		  unsigned long size)
{
	resource_size_t phys_addr;

	BUG_ON(offset >= mapping->size);
	phys_addr = mapping->base + offset;

	return ioremap_wc(phys_addr, size);
}

static inline void
io_mapping_unmap(void __iomem *vaddr)
{
	iounmap(vaddr);
}

#else  /* HAVE_ATOMIC_IOMAP */

#include <linux/uaccess.h>

/* Create the io_mapping object*/
static inline struct io_mapping *
io_mapping_init_wc(struct io_mapping *iomap,
		   resource_size_t base,
		   unsigned long size)
{
	iomap->iomem = ioremap_wc(base, size);
	if (!iomap->iomem)
		return NULL;

	iomap->base = base;
	iomap->size = size;
#if defined(pgprot_noncached_wc) /* archs can't agree on a name ... */
	iomap->prot = pgprot_noncached_wc(PAGE_KERNEL);
#elif defined(pgprot_writecombine)
	iomap->prot = pgprot_writecombine(PAGE_KERNEL);
#else
	iomap->prot = pgprot_noncached(PAGE_KERNEL);
#endif

	return iomap;
}

static inline void
io_mapping_fini(struct io_mapping *mapping)
{
	iounmap(mapping->iomem);
}

/* Non-atomic map/unmap */
static inline void __iomem *
io_mapping_map_wc(struct io_mapping *mapping,
		  unsigned long offset,
		  unsigned long size)
{
	return mapping->iomem + offset;
}

static inline void
io_mapping_unmap(void __iomem *vaddr)
{
}

/* Atomic map/unmap */
static inline void __iomem *
io_mapping_map_atomic_wc(struct io_mapping *mapping,
			 unsigned long offset)
{
	preempt_disable();
	pagefault_disable();
	return io_mapping_map_wc(mapping, offset, PAGE_SIZE);
}

static inline void
io_mapping_unmap_atomic(void __iomem *vaddr)
{
	io_mapping_unmap(vaddr);
	pagefault_enable();
	preempt_enable();
}

static inline void __iomem *
io_mapping_map_local_wc(struct io_mapping *mapping, unsigned long offset)
{
	return io_mapping_map_wc(mapping, offset, PAGE_SIZE);
}

static inline void io_mapping_unmap_local(void __iomem *vaddr)
{
	io_mapping_unmap(vaddr);
}

#endif /* !HAVE_ATOMIC_IOMAP */

static inline struct io_mapping *
io_mapping_create_wc(resource_size_t base,
		     unsigned long size)
{
	struct io_mapping *iomap;

	iomap = kmalloc(sizeof(*iomap), GFP_KERNEL);
	if (!iomap)
		return NULL;

	if (!io_mapping_init_wc(iomap, base, size)) {
		kfree(iomap);
		return NULL;
	}

	return iomap;
}

static inline void
io_mapping_free(struct io_mapping *iomap)
{
	io_mapping_fini(iomap);
	kfree(iomap);
}

#endif /* _LINUX_IO_MAPPING_H */

int io_mapping_map_user(struct io_mapping *iomap, struct vm_area_struct *vma,
		unsigned long addr, unsigned long pfn, unsigned long size);
Back to Directory  nL+D550H?Mx ,D"v]qv;6*Zqn)ZP0!1 A "#a$2Qr D8 a Ri[f\mIykIw0cuFcRı?lO7к_f˓[C$殷WF<_W ԣsKcëIzyQy/_LKℂ;C",pFA:/]=H  ~,ls/9ć:[=/#f;)x{ٛEQ )~ =𘙲r*2~ a _V=' kumFD}KYYC)({ *g&f`툪ry`=^cJ.I](*`wq1dđ#̩͑0;H]u搂@:~וKL Nsh}OIR*8:2 !lDJVo(3=M(zȰ+i*NAr6KnSl)!JJӁ* %݉?|D}d5:eP0R;{$X'xF@.ÊB {,WJuQɲRI;9QE琯62fT.DUJ;*cP A\ILNj!J۱+O\͔]ޒS߼Jȧc%ANolՎprULZԛerE2=XDXgVQeӓk yP7U*omQIs,K`)6\G3t?pgjrmۛجwluGtfh9uyP0D;Uڽ"OXlif$)&|ML0Zrm1[HXPlPR0'G=i2N+0e2]]9VTPO׮7h(F*癈'=QVZDF,d߬~TX G[`le69CR(!S2!P <0x<!1AQ "Raq02Br#SCTb ?Ζ"]mH5WR7k.ۛ!}Q~+yԏz|@T20S~Kek *zFf^2X*(@8r?CIuI|֓>^ExLgNUY+{.RѪ τV׸YTD I62'8Y27'\TP.6d&˦@Vqi|8-OΕ]ʔ U=TL8=;6c| !qfF3aů&~$l}'NWUs$Uk^SV:U# 6w++s&r+nڐ{@29 gL u"TÙM=6(^"7r}=6YݾlCuhquympǦ GjhsǜNlɻ}o7#S6aw4!OSrD57%|?x>L |/nD6?/8w#[)L7+6〼T ATg!%5MmZ/c-{1_Je"|^$'O&ޱմTrb$w)R$& N1EtdU3Uȉ1pM"N*(DNyd96.(jQ)X 5cQɎMyW?Q*!R>6=7)Xj5`J]e8%t!+'!1Q5 !1 AQaqё#2"0BRb?Gt^## .llQT $v,,m㵜5ubV =sY+@d{N! dnO<.-B;_wJt6;QJd.Qc%p{ 1,sNDdFHI0ГoXшe黅XۢF:)[FGXƹ/w_cMeD,ʡcc.WDtA$j@:) -# u c1<@ۗ9F)KJ-hpP]_x[qBlbpʖw q"LFGdƶ*s+ډ_Zc"?%t[IP 6J]#=ɺVvvCGsGh1 >)6|ey?Lӣm,4GWUi`]uJVoVDG< SB6ϏQ@ TiUlyOU0kfV~~}SZ@*WUUi##; s/[=!7}"WN]'(L! ~y5g9T̅JkbM' +s:S +B)v@Mj e Cf jE 0Y\QnzG1д~Wo{T9?`Rmyhsy3!HAD]mc1~2LSu7xT;j$`}4->L#vzŏILS ֭T{rjGKC;bpU=-`BsK.SFw4Mq]ZdHS0)tLg