From 240d3a7c47e3fb9c2533f63e9e323a25d91d0643 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 30 Jan 2008 13:34:05 +0100 Subject: [PATCH] x86: unify ioremap Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- arch/x86/mm/ioremap_32.c | 18 +++ arch/x86/mm/ioremap_64.c | 317 ++++++++++++++++++++++++++++++++++++--- 2 files changed, 313 insertions(+), 22 deletions(-) diff --git a/arch/x86/mm/ioremap_32.c b/arch/x86/mm/ioremap_32.c index 4d919c37d1d6..f4a2082568c8 100644 --- a/arch/x86/mm/ioremap_32.c +++ b/arch/x86/mm/ioremap_32.c @@ -19,6 +19,18 @@ #include #include +#ifdef CONFIG_X86_64 + +unsigned long __phys_addr(unsigned long x) +{ + if (x >= __START_KERNEL_map) + return x - __START_KERNEL_map + phys_base; + return x - PAGE_OFFSET; +} +EXPORT_SYMBOL(__phys_addr); + +#endif + /* * Fix up the linear direct mapping of the kernel to avoid cache attribute * conflicts. @@ -49,6 +61,7 @@ static int ioremap_change_attr(unsigned long phys_addr, unsigned long size, * memmap entry. */ err = change_page_attr_addr(vaddr, npages, prot); + if (!err) global_flush_tlb(); @@ -83,6 +96,7 @@ void __iomem *__ioremap(unsigned long phys_addr, unsigned long size, if (phys_addr >= ISA_START_ADDRESS && last_addr < ISA_END_ADDRESS) return (__force void __iomem *)phys_to_virt(phys_addr); +#ifdef CONFIG_X86_32 /* * Don't allow anybody to remap normal RAM that we're using.. */ @@ -98,6 +112,7 @@ void __iomem *__ioremap(unsigned long phys_addr, unsigned long size, if (!PageReserved(page)) return NULL; } +#endif pgprot = MAKE_GLOBAL(__PAGE_KERNEL | flags); @@ -211,6 +226,7 @@ void iounmap(volatile void __iomem *addr) } EXPORT_SYMBOL(iounmap); +#ifdef CONFIG_X86_32 int __initdata early_ioremap_debug; @@ -443,3 +459,5 @@ void __this_fixmap_does_not_exist(void) { WARN_ON(1); } + +#endif /* CONFIG_X86_32 */ diff --git a/arch/x86/mm/ioremap_64.c b/arch/x86/mm/ioremap_64.c index e79d2b353de0..f4a2082568c8 100644 --- a/arch/x86/mm/ioremap_64.c +++ b/arch/x86/mm/ioremap_64.c @@ -6,6 +6,7 @@ * (C) Copyright 1995 1996 Linus Torvalds */ +#include #include #include #include @@ -18,6 +19,8 @@ #include #include +#ifdef CONFIG_X86_64 + unsigned long __phys_addr(unsigned long x) { if (x >= __START_KERNEL_map) @@ -26,6 +29,8 @@ unsigned long __phys_addr(unsigned long x) } EXPORT_SYMBOL(__phys_addr); +#endif + /* * Fix up the linear direct mapping of the kernel to avoid cache attribute * conflicts. @@ -33,28 +38,33 @@ EXPORT_SYMBOL(__phys_addr); static int ioremap_change_attr(unsigned long phys_addr, unsigned long size, pgprot_t prot) { - int err = 0; - if (phys_addr + size - 1 < (end_pfn_map << PAGE_SHIFT)) { - unsigned long npages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; - unsigned long vaddr = (unsigned long) __va(phys_addr); - int level; - - /* - * If there is no identity map for this address, - * change_page_attr_addr is unnecessary - */ - if (!lookup_address(vaddr, &level)) - return err; - /* - * Must use a address here and not struct page because - * the phys addr can be a in hole between nodes and - * not have an memmap entry. - */ - err = change_page_attr_addr(vaddr, npages, prot); - - if (!err) - global_flush_tlb(); - } + unsigned long npages, vaddr, last_addr = phys_addr + size - 1; + int err, level; + + /* No change for pages after the last mapping */ + if (last_addr >= (max_pfn_mapped << PAGE_SHIFT)) + return 0; + + npages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; + vaddr = (unsigned long) __va(phys_addr); + + /* + * If there is no identity map for this address, + * change_page_attr_addr is unnecessary + */ + if (!lookup_address(vaddr, &level)) + return 0; + + /* + * Must use an address here and not struct page because the + * phys addr can be a in hole between nodes and not have a + * memmap entry. + */ + err = change_page_attr_addr(vaddr, npages, prot); + + if (!err) + global_flush_tlb(); + return err; } @@ -86,7 +96,26 @@ void __iomem *__ioremap(unsigned long phys_addr, unsigned long size, if (phys_addr >= ISA_START_ADDRESS && last_addr < ISA_END_ADDRESS) return (__force void __iomem *)phys_to_virt(phys_addr); +#ifdef CONFIG_X86_32 + /* + * Don't allow anybody to remap normal RAM that we're using.. + */ + if (phys_addr <= virt_to_phys(high_memory - 1)) { + char *t_addr, *t_end; + struct page *page; + + t_addr = __va(phys_addr); + t_end = t_addr + (size - 1); + + for (page = virt_to_page(t_addr); + page <= virt_to_page(t_end); page++) + if (!PageReserved(page)) + return NULL; + } +#endif + pgprot = MAKE_GLOBAL(__PAGE_KERNEL | flags); + /* * Mappings have to be page-aligned */ @@ -107,10 +136,12 @@ void __iomem *__ioremap(unsigned long phys_addr, unsigned long size, remove_vm_area((void *)(PAGE_MASK & (unsigned long) addr)); return NULL; } + if (ioremap_change_attr(phys_addr, size, pgprot) < 0) { vunmap(addr); return NULL; } + return (void __iomem *) (offset + (char __iomem *)addr); } EXPORT_SYMBOL(__ioremap); @@ -154,12 +185,19 @@ void iounmap(volatile void __iomem *addr) if ((void __force *)addr <= high_memory) return; + + /* + * __ioremap special-cases the PCI/ISA range by not instantiating a + * vm_area and by simply returning an address into the kernel mapping + * of ISA space. So handle that here. + */ if (addr >= phys_to_virt(ISA_START_ADDRESS) && addr < phys_to_virt(ISA_END_ADDRESS)) return; addr = (volatile void __iomem *) (PAGE_MASK & (unsigned long __force)addr); + /* Use the vm area unlocked, assuming the caller ensures there isn't another iounmap for the same address in parallel. Reuse of the virtual address is prevented by @@ -188,3 +226,238 @@ void iounmap(volatile void __iomem *addr) } EXPORT_SYMBOL(iounmap); +#ifdef CONFIG_X86_32 + +int __initdata early_ioremap_debug; + +static int __init early_ioremap_debug_setup(char *str) +{ + early_ioremap_debug = 1; + + return 0; +} +early_param("early_ioremap_debug", early_ioremap_debug_setup); + +static __initdata int after_paging_init; +static __initdata unsigned long bm_pte[1024] + __attribute__((aligned(PAGE_SIZE))); + +static inline unsigned long * __init early_ioremap_pgd(unsigned long addr) +{ + return (unsigned long *)swapper_pg_dir + ((addr >> 22) & 1023); +} + +static inline unsigned long * __init early_ioremap_pte(unsigned long addr) +{ + return bm_pte + ((addr >> PAGE_SHIFT) & 1023); +} + +void __init early_ioremap_init(void) +{ + unsigned long *pgd; + + if (early_ioremap_debug) + printk(KERN_DEBUG "early_ioremap_init()\n"); + + pgd = early_ioremap_pgd(fix_to_virt(FIX_BTMAP_BEGIN)); + *pgd = __pa(bm_pte) | _PAGE_TABLE; + memset(bm_pte, 0, sizeof(bm_pte)); + /* + * The boot-ioremap range spans multiple pgds, for which + * we are not prepared: + */ + if (pgd != early_ioremap_pgd(fix_to_virt(FIX_BTMAP_END))) { + WARN_ON(1); + printk(KERN_WARNING "pgd %p != %p\n", + pgd, early_ioremap_pgd(fix_to_virt(FIX_BTMAP_END))); + printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", + fix_to_virt(FIX_BTMAP_BEGIN)); + printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_END): %08lx\n", + fix_to_virt(FIX_BTMAP_END)); + + printk(KERN_WARNING "FIX_BTMAP_END: %d\n", FIX_BTMAP_END); + printk(KERN_WARNING "FIX_BTMAP_BEGIN: %d\n", + FIX_BTMAP_BEGIN); + } +} + +void __init early_ioremap_clear(void) +{ + unsigned long *pgd; + + if (early_ioremap_debug) + printk(KERN_DEBUG "early_ioremap_clear()\n"); + + pgd = early_ioremap_pgd(fix_to_virt(FIX_BTMAP_BEGIN)); + *pgd = 0; + __flush_tlb_all(); +} + +void __init early_ioremap_reset(void) +{ + enum fixed_addresses idx; + unsigned long *pte, phys, addr; + + after_paging_init = 1; + for (idx = FIX_BTMAP_BEGIN; idx >= FIX_BTMAP_END; idx--) { + addr = fix_to_virt(idx); + pte = early_ioremap_pte(addr); + if (!*pte & _PAGE_PRESENT) { + phys = *pte & PAGE_MASK; + set_fixmap(idx, phys); + } + } +} + +static void __init __early_set_fixmap(enum fixed_addresses idx, + unsigned long phys, pgprot_t flags) +{ + unsigned long *pte, addr = __fix_to_virt(idx); + + if (idx >= __end_of_fixed_addresses) { + BUG(); + return; + } + pte = early_ioremap_pte(addr); + if (pgprot_val(flags)) + *pte = (phys & PAGE_MASK) | pgprot_val(flags); + else + *pte = 0; + __flush_tlb_one(addr); +} + +static inline void __init early_set_fixmap(enum fixed_addresses idx, + unsigned long phys) +{ + if (after_paging_init) + set_fixmap(idx, phys); + else + __early_set_fixmap(idx, phys, PAGE_KERNEL); +} + +static inline void __init early_clear_fixmap(enum fixed_addresses idx) +{ + if (after_paging_init) + clear_fixmap(idx); + else + __early_set_fixmap(idx, 0, __pgprot(0)); +} + + +int __initdata early_ioremap_nested; + +static int __init check_early_ioremap_leak(void) +{ + if (!early_ioremap_nested) + return 0; + + printk(KERN_WARNING + "Debug warning: early ioremap leak of %d areas detected.\n", + early_ioremap_nested); + printk(KERN_WARNING + "please boot with early_ioremap_debug and report the dmesg.\n"); + WARN_ON(1); + + return 1; +} +late_initcall(check_early_ioremap_leak); + +void __init *early_ioremap(unsigned long phys_addr, unsigned long size) +{ + unsigned long offset, last_addr; + unsigned int nrpages, nesting; + enum fixed_addresses idx0, idx; + + WARN_ON(system_state != SYSTEM_BOOTING); + + nesting = early_ioremap_nested; + if (early_ioremap_debug) { + printk(KERN_DEBUG "early_ioremap(%08lx, %08lx) [%d] => ", + phys_addr, size, nesting); + dump_stack(); + } + + /* Don't allow wraparound or zero size */ + last_addr = phys_addr + size - 1; + if (!size || last_addr < phys_addr) { + WARN_ON(1); + return NULL; + } + + if (nesting >= FIX_BTMAPS_NESTING) { + WARN_ON(1); + return NULL; + } + early_ioremap_nested++; + /* + * Mappings have to be page-aligned + */ + offset = phys_addr & ~PAGE_MASK; + phys_addr &= PAGE_MASK; + size = PAGE_ALIGN(last_addr) - phys_addr; + + /* + * Mappings have to fit in the FIX_BTMAP area. + */ + nrpages = size >> PAGE_SHIFT; + if (nrpages > NR_FIX_BTMAPS) { + WARN_ON(1); + return NULL; + } + + /* + * Ok, go for it.. + */ + idx0 = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*nesting; + idx = idx0; + while (nrpages > 0) { + early_set_fixmap(idx, phys_addr); + phys_addr += PAGE_SIZE; + --idx; + --nrpages; + } + if (early_ioremap_debug) + printk(KERN_CONT "%08lx + %08lx\n", offset, fix_to_virt(idx0)); + + return (void *) (offset + fix_to_virt(idx0)); +} + +void __init early_iounmap(void *addr, unsigned long size) +{ + unsigned long virt_addr; + unsigned long offset; + unsigned int nrpages; + enum fixed_addresses idx; + unsigned int nesting; + + nesting = --early_ioremap_nested; + WARN_ON(nesting < 0); + + if (early_ioremap_debug) { + printk(KERN_DEBUG "early_iounmap(%p, %08lx) [%d]\n", addr, + size, nesting); + dump_stack(); + } + + virt_addr = (unsigned long)addr; + if (virt_addr < fix_to_virt(FIX_BTMAP_BEGIN)) { + WARN_ON(1); + return; + } + offset = virt_addr & ~PAGE_MASK; + nrpages = PAGE_ALIGN(offset + size - 1) >> PAGE_SHIFT; + + idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*nesting; + while (nrpages > 0) { + early_clear_fixmap(idx); + --idx; + --nrpages; + } +} + +void __this_fixmap_does_not_exist(void) +{ + WARN_ON(1); +} + +#endif /* CONFIG_X86_32 */ -- 2.39.2