cregit-Linux how code gets into the kernel

Release 4.18 lib/ioremap.c

Directory: lib
// SPDX-License-Identifier: GPL-2.0
/*
 * Re-map IO memory to kernel address space so that we can access it.
 * This is needed for high PCI addresses that aren't mapped in the
 * 640k-1MB IO memory area on PC's
 *
 * (C) Copyright 1995 1996 Linus Torvalds
 */
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/io.h>
#include <linux/export.h>
#include <asm/cacheflush.h>
#include <asm/pgtable.h>

#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP

static int __read_mostly ioremap_p4d_capable;

static int __read_mostly ioremap_pud_capable;

static int __read_mostly ioremap_pmd_capable;

static int __read_mostly ioremap_huge_disabled;


static int __init set_nohugeiomap(char *str) { ioremap_huge_disabled = 1; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Toshi Kani18100.00%1100.00%
Total18100.00%1100.00%

early_param("nohugeiomap", set_nohugeiomap);
void __init ioremap_huge_init(void) { if (!ioremap_huge_disabled) { if (arch_ioremap_pud_supported()) ioremap_pud_capable = 1; if (arch_ioremap_pmd_supported()) ioremap_pmd_capable = 1; } }

Contributors

PersonTokensPropCommitsCommitProp
Toshi Kani33100.00%1100.00%
Total33100.00%1100.00%


static inline int ioremap_p4d_enabled(void) { return ioremap_p4d_capable; }

Contributors

PersonTokensPropCommitsCommitProp
Kirill A. Shutemov12100.00%1100.00%
Total12100.00%1100.00%


static inline int ioremap_pud_enabled(void) { return ioremap_pud_capable; }

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PersonTokensPropCommitsCommitProp
Toshi Kani12100.00%1100.00%
Total12100.00%1100.00%


static inline int ioremap_pmd_enabled(void) { return ioremap_pmd_capable; }

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PersonTokensPropCommitsCommitProp
Toshi Kani12100.00%1100.00%
Total12100.00%1100.00%

#else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
static inline int ioremap_p4d_enabled(void) { return 0; }

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PersonTokensPropCommitsCommitProp
Kirill A. Shutemov12100.00%1100.00%
Total12100.00%1100.00%


static inline int ioremap_pud_enabled(void) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Toshi Kani12100.00%1100.00%
Total12100.00%1100.00%


static inline int ioremap_pmd_enabled(void) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Toshi Kani12100.00%1100.00%
Total12100.00%1100.00%

#endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */
static int ioremap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgprot_t prot) { pte_t *pte; u64 pfn; pfn = phys_addr >> PAGE_SHIFT; pte = pte_alloc_kernel(pmd, addr); if (!pte) return -ENOMEM; do { BUG_ON(!pte_none(*pte)); set_pte_at(&init_mm, addr, pte, pfn_pte(pfn, prot)); pfn++; } while (pte++, addr += PAGE_SIZE, addr != end); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Håvard Skinnemoen10398.10%150.00%
Kenji Kaneshige21.90%150.00%
Total105100.00%2100.00%


static inline int ioremap_pmd_range(pud_t *pud, unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgprot_t prot) { pmd_t *pmd; unsigned long next; phys_addr -= addr; pmd = pmd_alloc(&init_mm, pud, addr); if (!pmd) return -ENOMEM; do { next = pmd_addr_end(addr, end); if (ioremap_pmd_enabled() && ((next - addr) == PMD_SIZE) && IS_ALIGNED(phys_addr + addr, PMD_SIZE) && pmd_free_pte_page(pmd)) { if (pmd_set_huge(pmd, phys_addr + addr, prot)) continue; } if (ioremap_pte_range(pmd, addr, next, phys_addr + addr, prot)) return -ENOMEM; } while (pmd++, addr = next, addr != end); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Håvard Skinnemoen10769.93%125.00%
Toshi Kani4529.41%250.00%
Kenji Kaneshige10.65%125.00%
Total153100.00%4100.00%


static inline int ioremap_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgprot_t prot) { pud_t *pud; unsigned long next; phys_addr -= addr; pud = pud_alloc(&init_mm, p4d, addr); if (!pud) return -ENOMEM; do { next = pud_addr_end(addr, end); if (ioremap_pud_enabled() && ((next - addr) == PUD_SIZE) && IS_ALIGNED(phys_addr + addr, PUD_SIZE) && pud_free_pmd_page(pud)) { if (pud_set_huge(pud, phys_addr + addr, prot)) continue; } if (ioremap_pmd_range(pud, addr, next, phys_addr + addr, prot)) return -ENOMEM; } while (pud++, addr = next, addr != end); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Håvard Skinnemoen10467.97%120.00%
Toshi Kani4529.41%240.00%
Kirill A. Shutemov31.96%120.00%
Kenji Kaneshige10.65%120.00%
Total153100.00%5100.00%


static inline int ioremap_p4d_range(pgd_t *pgd, unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgprot_t prot) { p4d_t *p4d; unsigned long next; phys_addr -= addr; p4d = p4d_alloc(&init_mm, pgd, addr); if (!p4d) return -ENOMEM; do { next = p4d_addr_end(addr, end); if (ioremap_p4d_enabled() && ((next - addr) == P4D_SIZE) && IS_ALIGNED(phys_addr + addr, P4D_SIZE)) { if (p4d_set_huge(p4d, phys_addr + addr, prot)) continue; } if (ioremap_pud_range(p4d, addr, next, phys_addr + addr, prot)) return -ENOMEM; } while (p4d++, addr = next, addr != end); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Kirill A. Shutemov148100.00%1100.00%
Total148100.00%1100.00%


int ioremap_page_range(unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgprot_t prot) { pgd_t *pgd; unsigned long start; unsigned long next; int err; might_sleep(); BUG_ON(addr >= end); start = addr; phys_addr -= addr; pgd = pgd_offset_k(addr); do { next = pgd_addr_end(addr, end); err = ioremap_p4d_range(pgd, addr, next, phys_addr+addr, prot); if (err) break; } while (pgd++, addr = next, addr != end); flush_cache_vmap(start, end); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Håvard Skinnemoen11295.73%240.00%
Linus Torvalds32.56%120.00%
Kirill A. Shutemov10.85%120.00%
Kenji Kaneshige10.85%120.00%
Total117100.00%5100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Håvard Skinnemoen43951.17%214.29%
Toshi Kani22025.64%428.57%
Kirill A. Shutemov18121.10%17.14%
Kenji Kaneshige50.58%17.14%
Adrian Bunk30.35%17.14%
Linus Torvalds30.35%17.14%
Alexey Dobriyan30.35%17.14%
Huang Ying20.23%17.14%
Paul Gortmaker10.12%17.14%
Greg Kroah-Hartman10.12%17.14%
Total858100.00%14100.00%
Directory: lib
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