diff options
Diffstat (limited to 'arch/x86/mm/ioremap.c')
| -rw-r--r-- | arch/x86/mm/ioremap.c | 492 |
1 files changed, 204 insertions, 288 deletions
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index 794895c6dcc..baff1da354e 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -12,6 +12,7 @@ #include <linux/module.h> #include <linux/slab.h> #include <linux/vmalloc.h> +#include <linux/mmiotrace.h> #include <asm/cacheflush.h> #include <asm/e820.h> @@ -19,84 +20,51 @@ #include <asm/pgtable.h> #include <asm/tlbflush.h> #include <asm/pgalloc.h> +#include <asm/pat.h> -enum ioremap_mode { - IOR_MODE_UNCACHED, - IOR_MODE_CACHED, -}; - -#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 - -int page_is_ram(unsigned long pagenr) -{ - unsigned long addr, end; - int i; - - /* - * A special case is the first 4Kb of memory; - * This is a BIOS owned area, not kernel ram, but generally - * not listed as such in the E820 table. - */ - if (pagenr == 0) - return 0; - - /* - * Second special case: Some BIOSen report the PC BIOS - * area (640->1Mb) as ram even though it is not. - */ - if (pagenr >= (BIOS_BEGIN >> PAGE_SHIFT) && - pagenr < (BIOS_END >> PAGE_SHIFT)) - return 0; - - for (i = 0; i < e820.nr_map; i++) { - /* - * Not usable memory: - */ - if (e820.map[i].type != E820_RAM) - continue; - addr = (e820.map[i].addr + PAGE_SIZE-1) >> PAGE_SHIFT; - end = (e820.map[i].addr + e820.map[i].size) >> PAGE_SHIFT; - - - if ((pagenr >= addr) && (pagenr < end)) - return 1; - } - return 0; -} +#include "physaddr.h" /* * Fix up the linear direct mapping of the kernel to avoid cache attribute * conflicts. */ -static int ioremap_change_attr(unsigned long vaddr, unsigned long size, - enum ioremap_mode mode) +int ioremap_change_attr(unsigned long vaddr, unsigned long size, + unsigned long prot_val) { unsigned long nrpages = size >> PAGE_SHIFT; int err; - switch (mode) { - case IOR_MODE_UNCACHED: + switch (prot_val) { + case _PAGE_CACHE_UC: default: - err = set_memory_uc(vaddr, nrpages); + err = _set_memory_uc(vaddr, nrpages); break; - case IOR_MODE_CACHED: - err = set_memory_wb(vaddr, nrpages); + case _PAGE_CACHE_WC: + err = _set_memory_wc(vaddr, nrpages); + break; + case _PAGE_CACHE_WB: + err = _set_memory_wb(vaddr, nrpages); break; } return err; } +static int __ioremap_check_ram(unsigned long start_pfn, unsigned long nr_pages, + void *arg) +{ + unsigned long i; + + for (i = 0; i < nr_pages; ++i) + if (pfn_valid(start_pfn + i) && + !PageReserved(pfn_to_page(start_pfn + i))) + return 1; + + WARN_ONCE(1, "ioremap on RAM pfn 0x%lx\n", start_pfn); + + return 0; +} + /* * Remap an arbitrary physical address space into the kernel virtual * address space. Needed when the kernel wants to access high addresses @@ -106,79 +74,125 @@ static int ioremap_change_attr(unsigned long vaddr, unsigned long size, * have to convert them into an offset in a page-aligned mapping, but the * caller shouldn't need to know that small detail. */ -static void __iomem *__ioremap(resource_size_t phys_addr, unsigned long size, - enum ioremap_mode mode) +static void __iomem *__ioremap_caller(resource_size_t phys_addr, + unsigned long size, unsigned long prot_val, void *caller) { - unsigned long pfn, offset, last_addr, vaddr; + unsigned long offset, vaddr; + resource_size_t pfn, last_pfn, last_addr; + const resource_size_t unaligned_phys_addr = phys_addr; + const unsigned long unaligned_size = size; struct vm_struct *area; + unsigned long new_prot_val; pgprot_t prot; + int retval; + void __iomem *ret_addr; /* Don't allow wraparound or zero size */ last_addr = phys_addr + size - 1; if (!size || last_addr < phys_addr) return NULL; + if (!phys_addr_valid(phys_addr)) { + printk(KERN_WARNING "ioremap: invalid physical address %llx\n", + (unsigned long long)phys_addr); + WARN_ON_ONCE(1); + return NULL; + } + /* * Don't remap the low PCI/ISA area, it's always mapped.. */ - if (phys_addr >= ISA_START_ADDRESS && last_addr < ISA_END_ADDRESS) + if (is_ISA_range(phys_addr, last_addr)) return (__force void __iomem *)phys_to_virt(phys_addr); /* * Don't allow anybody to remap normal RAM that we're using.. */ - for (pfn = phys_addr >> PAGE_SHIFT; pfn < max_pfn_mapped && - (pfn << PAGE_SHIFT) < last_addr; pfn++) { - if (page_is_ram(pfn) && pfn_valid(pfn) && - !PageReserved(pfn_to_page(pfn))) - return NULL; - } - - switch (mode) { - case IOR_MODE_UNCACHED: - default: - /* - * FIXME: we will use UC MINUS for now, as video fb drivers - * depend on it. Upcoming ioremap_wc() will fix this behavior. - */ - prot = PAGE_KERNEL_UC_MINUS; - break; - case IOR_MODE_CACHED: - prot = PAGE_KERNEL; - break; - } + pfn = phys_addr >> PAGE_SHIFT; + last_pfn = last_addr >> PAGE_SHIFT; + if (walk_system_ram_range(pfn, last_pfn - pfn + 1, NULL, + __ioremap_check_ram) == 1) + return NULL; /* * Mappings have to be page-aligned */ offset = phys_addr & ~PAGE_MASK; - phys_addr &= PAGE_MASK; + phys_addr &= PHYSICAL_PAGE_MASK; size = PAGE_ALIGN(last_addr+1) - phys_addr; + retval = reserve_memtype(phys_addr, (u64)phys_addr + size, + prot_val, &new_prot_val); + if (retval) { + printk(KERN_ERR "ioremap reserve_memtype failed %d\n", retval); + return NULL; + } + + if (prot_val != new_prot_val) { + if (!is_new_memtype_allowed(phys_addr, size, + prot_val, new_prot_val)) { + printk(KERN_ERR + "ioremap error for 0x%llx-0x%llx, requested 0x%lx, got 0x%lx\n", + (unsigned long long)phys_addr, + (unsigned long long)(phys_addr + size), + prot_val, new_prot_val); + goto err_free_memtype; + } + prot_val = new_prot_val; + } + + switch (prot_val) { + case _PAGE_CACHE_UC: + default: + prot = PAGE_KERNEL_IO_NOCACHE; + break; + case _PAGE_CACHE_UC_MINUS: + prot = PAGE_KERNEL_IO_UC_MINUS; + break; + case _PAGE_CACHE_WC: + prot = PAGE_KERNEL_IO_WC; + break; + case _PAGE_CACHE_WB: + prot = PAGE_KERNEL_IO; + break; + } + /* * Ok, go for it.. */ - area = get_vm_area(size, VM_IOREMAP); + area = get_vm_area_caller(size, VM_IOREMAP, caller); if (!area) - return NULL; + goto err_free_memtype; area->phys_addr = phys_addr; vaddr = (unsigned long) area->addr; - if (ioremap_page_range(vaddr, vaddr + size, phys_addr, prot)) { - free_vm_area(area); - return NULL; - } - if (ioremap_change_attr(vaddr, size, mode) < 0) { - vunmap(area->addr); - return NULL; - } + if (kernel_map_sync_memtype(phys_addr, size, prot_val)) + goto err_free_area; + + if (ioremap_page_range(vaddr, vaddr + size, phys_addr, prot)) + goto err_free_area; - return (void __iomem *) (vaddr + offset); + ret_addr = (void __iomem *) (vaddr + offset); + mmiotrace_ioremap(unaligned_phys_addr, unaligned_size, ret_addr); + + /* + * Check if the request spans more than any BAR in the iomem resource + * tree. + */ + WARN_ONCE(iomem_map_sanity_check(unaligned_phys_addr, unaligned_size), + KERN_INFO "Info: mapping multiple BARs. Your kernel is fine."); + + return ret_addr; +err_free_area: + free_vm_area(area); +err_free_memtype: + free_memtype(phys_addr, phys_addr + size); + return NULL; } /** * ioremap_nocache - map bus memory into CPU space - * @offset: bus address of the memory + * @phys_addr: bus address of the memory * @size: size of the resource to map * * ioremap_nocache performs a platform specific sequence of operations to @@ -199,16 +213,55 @@ static void __iomem *__ioremap(resource_size_t phys_addr, unsigned long size, */ void __iomem *ioremap_nocache(resource_size_t phys_addr, unsigned long size) { - return __ioremap(phys_addr, size, IOR_MODE_UNCACHED); + /* + * Ideally, this should be: + * pat_enabled ? _PAGE_CACHE_UC : _PAGE_CACHE_UC_MINUS; + * + * Till we fix all X drivers to use ioremap_wc(), we will use + * UC MINUS. + */ + unsigned long val = _PAGE_CACHE_UC_MINUS; + + return __ioremap_caller(phys_addr, size, val, + __builtin_return_address(0)); } EXPORT_SYMBOL(ioremap_nocache); +/** + * ioremap_wc - map memory into CPU space write combined + * @phys_addr: bus address of the memory + * @size: size of the resource to map + * + * This version of ioremap ensures that the memory is marked write combining. + * Write combining allows faster writes to some hardware devices. + * + * Must be freed with iounmap. + */ +void __iomem *ioremap_wc(resource_size_t phys_addr, unsigned long size) +{ + if (pat_enabled) + return __ioremap_caller(phys_addr, size, _PAGE_CACHE_WC, + __builtin_return_address(0)); + else + return ioremap_nocache(phys_addr, size); +} +EXPORT_SYMBOL(ioremap_wc); + void __iomem *ioremap_cache(resource_size_t phys_addr, unsigned long size) { - return __ioremap(phys_addr, size, IOR_MODE_CACHED); + return __ioremap_caller(phys_addr, size, _PAGE_CACHE_WB, + __builtin_return_address(0)); } EXPORT_SYMBOL(ioremap_cache); +void __iomem *ioremap_prot(resource_size_t phys_addr, unsigned long size, + unsigned long prot_val) +{ + return __ioremap_caller(phys_addr, size, (prot_val & _PAGE_CACHE_MASK), + __builtin_return_address(0)); +} +EXPORT_SYMBOL(ioremap_prot); + /** * iounmap - Free a IO remapping * @addr: virtual address from ioremap_* @@ -227,24 +280,21 @@ void iounmap(volatile void __iomem *addr) * 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)) + if ((void __force *)addr >= phys_to_virt(ISA_START_ADDRESS) && + (void __force *)addr < phys_to_virt(ISA_END_ADDRESS)) return; addr = (volatile void __iomem *) (PAGE_MASK & (unsigned long __force)addr); + mmiotrace_iounmap(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 leaving it in the global lists until we're done with it. cpa takes care of the direct mappings. */ - read_lock(&vmlist_lock); - for (p = vmlist; p; p = p->next) { - if (p->addr == addr) - break; - } - read_unlock(&vmlist_lock); + p = find_vm_area((void __force *)addr); if (!p) { printk(KERN_ERR "iounmap: bad address %p\n", addr); @@ -252,28 +302,45 @@ void iounmap(volatile void __iomem *addr) return; } + free_memtype(p->phys_addr, p->phys_addr + get_vm_area_size(p)); + /* Finally remove it */ - o = remove_vm_area((void *)addr); + o = remove_vm_area((void __force *)addr); BUG_ON(p != o || o == NULL); kfree(p); } EXPORT_SYMBOL(iounmap); -#ifdef CONFIG_X86_32 +/* + * Convert a physical pointer to a virtual kernel pointer for /dev/mem + * access + */ +void *xlate_dev_mem_ptr(unsigned long phys) +{ + void *addr; + unsigned long start = phys & PAGE_MASK; + + /* If page is RAM, we can use __va. Otherwise ioremap and unmap. */ + if (page_is_ram(start >> PAGE_SHIFT)) + return __va(phys); + + addr = (void __force *)ioremap_cache(start, PAGE_SIZE); + if (addr) + addr = (void *)((unsigned long)addr | (phys & ~PAGE_MASK)); -int __initdata early_ioremap_debug; + return addr; +} -static int __init early_ioremap_debug_setup(char *str) +void unxlate_dev_mem_ptr(unsigned long phys, void *addr) { - early_ioremap_debug = 1; + if (page_is_ram(phys >> PAGE_SHIFT)) + return; - return 0; + iounmap((void __iomem *)((unsigned long)addr & PAGE_MASK)); + return; } -early_param("early_ioremap_debug", early_ioremap_debug_setup); -static __initdata int after_paging_init; -static __initdata pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)] - __attribute__((aligned(PAGE_SIZE))); +static pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)] __page_aligned_bss; static inline pmd_t * __init early_ioremap_pmd(unsigned long addr) { @@ -291,12 +358,22 @@ static inline pte_t * __init early_ioremap_pte(unsigned long addr) return &bm_pte[pte_index(addr)]; } +bool __init is_early_ioremap_ptep(pte_t *ptep) +{ + return ptep >= &bm_pte[0] && ptep < &bm_pte[PAGE_SIZE/sizeof(pte_t)]; +} + void __init early_ioremap_init(void) { pmd_t *pmd; - if (early_ioremap_debug) - printk(KERN_INFO "early_ioremap_init()\n"); +#ifdef CONFIG_X86_64 + BUILD_BUG_ON((fix_to_virt(0) + PAGE_SIZE) & ((1 << PMD_SHIFT) - 1)); +#else + WARN_ON((fix_to_virt(0) + PAGE_SIZE) & ((1 << PMD_SHIFT) - 1)); +#endif + + early_ioremap_setup(); pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)); memset(bm_pte, 0, sizeof(bm_pte)); @@ -306,6 +383,10 @@ void __init early_ioremap_init(void) * The boot-ioremap range spans multiple pmds, for which * we are not prepared: */ +#define __FIXADDR_TOP (-PAGE_SIZE) + BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) + != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); +#undef __FIXADDR_TOP if (pmd != early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END))) { WARN_ON(1); printk(KERN_WARNING "pmd %p != %p\n", @@ -321,38 +402,8 @@ void __init early_ioremap_init(void) } } -void __init early_ioremap_clear(void) -{ - pmd_t *pmd; - - if (early_ioremap_debug) - printk(KERN_INFO "early_ioremap_clear()\n"); - - pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)); - pmd_clear(pmd); - paravirt_release_pt(__pa(bm_pte) >> PAGE_SHIFT); - __flush_tlb_all(); -} - -void __init early_ioremap_reset(void) -{ - enum fixed_addresses idx; - unsigned long addr, phys; - pte_t *pte; - - 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_present(*pte)) { - phys = pte_val(*pte) & PAGE_MASK; - set_fixmap(idx, phys); - } - } -} - -static void __init __early_set_fixmap(enum fixed_addresses idx, - unsigned long phys, pgprot_t flags) +void __init __early_set_fixmap(enum fixed_addresses idx, + phys_addr_t phys, pgprot_t flags) { unsigned long addr = __fix_to_virt(idx); pte_t *pte; @@ -362,145 +413,10 @@ static void __init __early_set_fixmap(enum fixed_addresses idx, return; } pte = early_ioremap_pte(addr); + if (pgprot_val(flags)) set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); else - pte_clear(NULL, addr, pte); + pte_clear(&init_mm, addr, pte); __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_INFO "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_INFO "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 */ |