2006-10-01 13:29:12 +07:00
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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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* (C) Copyright 1995 1996 Linus Torvalds
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*/
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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Detach sched.h from mm.h
First thing mm.h does is including sched.h solely for can_do_mlock() inline
function which has "current" dereference inside. By dealing with can_do_mlock()
mm.h can be detached from sched.h which is good. See below, why.
This patch
a) removes unconditional inclusion of sched.h from mm.h
b) makes can_do_mlock() normal function in mm/mlock.c
c) exports can_do_mlock() to not break compilation
d) adds sched.h inclusions back to files that were getting it indirectly.
e) adds less bloated headers to some files (asm/signal.h, jiffies.h) that were
getting them indirectly
Net result is:
a) mm.h users would get less code to open, read, preprocess, parse, ... if
they don't need sched.h
b) sched.h stops being dependency for significant number of files:
on x86_64 allmodconfig touching sched.h results in recompile of 4083 files,
after patch it's only 3744 (-8.3%).
Cross-compile tested on
all arm defconfigs, all mips defconfigs, all powerpc defconfigs,
alpha alpha-up
arm
i386 i386-up i386-defconfig i386-allnoconfig
ia64 ia64-up
m68k
mips
parisc parisc-up
powerpc powerpc-up
s390 s390-up
sparc sparc-up
sparc64 sparc64-up
um-x86_64
x86_64 x86_64-up x86_64-defconfig x86_64-allnoconfig
as well as my two usual configs.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-21 04:22:52 +07:00
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#include <linux/sched.h>
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2007-10-17 13:26:42 +07:00
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#include <linux/io.h>
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2011-11-17 09:29:17 +07:00
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#include <linux/export.h>
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2006-10-01 13:29:12 +07:00
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#include <asm/cacheflush.h>
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#include <asm/pgtable.h>
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2015-04-15 05:47:20 +07:00
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#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
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2017-03-09 21:24:07 +07:00
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static int __read_mostly ioremap_p4d_capable;
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2015-04-15 05:47:32 +07:00
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static int __read_mostly ioremap_pud_capable;
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static int __read_mostly ioremap_pmd_capable;
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static int __read_mostly ioremap_huge_disabled;
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2015-04-15 05:47:20 +07:00
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static int __init set_nohugeiomap(char *str)
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{
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ioremap_huge_disabled = 1;
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return 0;
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}
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early_param("nohugeiomap", set_nohugeiomap);
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void __init ioremap_huge_init(void)
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{
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if (!ioremap_huge_disabled) {
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if (arch_ioremap_pud_supported())
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ioremap_pud_capable = 1;
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if (arch_ioremap_pmd_supported())
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ioremap_pmd_capable = 1;
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}
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}
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2017-03-09 21:24:07 +07:00
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static inline int ioremap_p4d_enabled(void)
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{
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return ioremap_p4d_capable;
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}
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2015-04-15 05:47:20 +07:00
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static inline int ioremap_pud_enabled(void)
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{
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return ioremap_pud_capable;
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}
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static inline int ioremap_pmd_enabled(void)
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{
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return ioremap_pmd_capable;
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}
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#else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
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2017-03-09 21:24:07 +07:00
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static inline int ioremap_p4d_enabled(void) { return 0; }
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2015-04-15 05:47:20 +07:00
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static inline int ioremap_pud_enabled(void) { return 0; }
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static inline int ioremap_pmd_enabled(void) { return 0; }
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#endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */
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2006-10-01 13:29:12 +07:00
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static int ioremap_pte_range(pmd_t *pmd, unsigned long addr,
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2010-06-18 10:22:40 +07:00
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unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
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2006-10-01 13:29:12 +07:00
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{
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pte_t *pte;
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2010-06-18 10:22:40 +07:00
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u64 pfn;
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2006-10-01 13:29:12 +07:00
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pfn = phys_addr >> PAGE_SHIFT;
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pte = pte_alloc_kernel(pmd, addr);
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if (!pte)
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return -ENOMEM;
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do {
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BUG_ON(!pte_none(*pte));
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set_pte_at(&init_mm, addr, pte, pfn_pte(pfn, prot));
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pfn++;
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} while (pte++, addr += PAGE_SIZE, addr != end);
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return 0;
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}
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static inline int ioremap_pmd_range(pud_t *pud, unsigned long addr,
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2010-06-18 10:22:40 +07:00
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unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
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2006-10-01 13:29:12 +07:00
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{
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pmd_t *pmd;
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unsigned long next;
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phys_addr -= addr;
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pmd = pmd_alloc(&init_mm, pud, addr);
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if (!pmd)
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return -ENOMEM;
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do {
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next = pmd_addr_end(addr, end);
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2015-04-15 05:47:23 +07:00
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if (ioremap_pmd_enabled() &&
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((next - addr) == PMD_SIZE) &&
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IS_ALIGNED(phys_addr + addr, PMD_SIZE)) {
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if (pmd_set_huge(pmd, phys_addr + addr, prot))
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continue;
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}
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2006-10-01 13:29:12 +07:00
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if (ioremap_pte_range(pmd, addr, next, phys_addr + addr, prot))
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return -ENOMEM;
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} while (pmd++, addr = next, addr != end);
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return 0;
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}
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2017-03-09 21:24:07 +07:00
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static inline int ioremap_pud_range(p4d_t *p4d, unsigned long addr,
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2010-06-18 10:22:40 +07:00
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unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
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2006-10-01 13:29:12 +07:00
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{
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pud_t *pud;
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unsigned long next;
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phys_addr -= addr;
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2017-03-09 21:24:07 +07:00
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pud = pud_alloc(&init_mm, p4d, addr);
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2006-10-01 13:29:12 +07:00
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if (!pud)
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return -ENOMEM;
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do {
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next = pud_addr_end(addr, end);
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2015-04-15 05:47:23 +07:00
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if (ioremap_pud_enabled() &&
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((next - addr) == PUD_SIZE) &&
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IS_ALIGNED(phys_addr + addr, PUD_SIZE)) {
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if (pud_set_huge(pud, phys_addr + addr, prot))
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continue;
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}
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2006-10-01 13:29:12 +07:00
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if (ioremap_pmd_range(pud, addr, next, phys_addr + addr, prot))
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return -ENOMEM;
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} while (pud++, addr = next, addr != end);
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return 0;
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}
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2017-03-09 21:24:07 +07:00
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static inline int ioremap_p4d_range(pgd_t *pgd, unsigned long addr,
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unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
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{
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p4d_t *p4d;
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unsigned long next;
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phys_addr -= addr;
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p4d = p4d_alloc(&init_mm, pgd, addr);
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if (!p4d)
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return -ENOMEM;
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do {
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next = p4d_addr_end(addr, end);
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if (ioremap_p4d_enabled() &&
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((next - addr) == P4D_SIZE) &&
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IS_ALIGNED(phys_addr + addr, P4D_SIZE)) {
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if (p4d_set_huge(p4d, phys_addr + addr, prot))
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continue;
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}
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if (ioremap_pud_range(p4d, addr, next, phys_addr + addr, prot))
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return -ENOMEM;
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} while (p4d++, addr = next, addr != end);
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return 0;
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}
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2006-10-01 13:29:12 +07:00
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int ioremap_page_range(unsigned long addr,
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2010-06-18 10:22:40 +07:00
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unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
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2006-10-01 13:29:12 +07:00
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{
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pgd_t *pgd;
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unsigned long start;
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unsigned long next;
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int err;
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BUG_ON(addr >= end);
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start = addr;
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phys_addr -= addr;
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pgd = pgd_offset_k(addr);
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do {
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next = pgd_addr_end(addr, end);
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2017-03-09 21:24:07 +07:00
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err = ioremap_p4d_range(pgd, addr, next, phys_addr+addr, prot);
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2006-10-01 13:29:12 +07:00
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if (err)
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break;
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} while (pgd++, addr = next, addr != end);
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2006-10-01 13:29:14 +07:00
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flush_cache_vmap(start, end);
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2006-10-01 13:29:12 +07:00
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return err;
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}
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