x86: unify ioremap
authorThomas Gleixner <tglx@linutronix.de>
Wed, 30 Jan 2008 12:34:05 +0000 (13:34 +0100)
committerIngo Molnar <mingo@elte.hu>
Wed, 30 Jan 2008 12:34:05 +0000 (13:34 +0100)
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
arch/x86/mm/ioremap_32.c
arch/x86/mm/ioremap_64.c

index 4d919c37d1d6211d7213a4bb17e5b05d944a7adb..f4a2082568c8544ea7d005c316af317a0581f2a9 100644 (file)
 #include <asm/pgtable.h>
 #include <asm/tlbflush.h>
 
+#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 */
index e79d2b353de0e4aaa740e861081cc09eec84f41e..f4a2082568c8544ea7d005c316af317a0581f2a9 100644 (file)
@@ -6,6 +6,7 @@
  * (C) Copyright 1995 1996 Linus Torvalds
  */
 
+#include <linux/bootmem.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/module.h>
@@ -18,6 +19,8 @@
 #include <asm/pgtable.h>
 #include <asm/tlbflush.h>
 
+#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 */