#include <linux/module.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
+#include <linux/mmiotrace.h>
#include <asm/cacheflush.h>
#include <asm/e820.h>
#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,
-};
+static inline int phys_addr_valid(resource_size_t addr)
+{
+#ifdef CONFIG_PHYS_ADDR_T_64BIT
+ return !(addr >> boot_cpu_data.x86_phys_bits);
+#else
+ return 1;
+#endif
+}
#ifdef CONFIG_X86_64
unsigned long __phys_addr(unsigned long x)
{
- if (x >= __START_KERNEL_map)
- return x - __START_KERNEL_map + phys_base;
+ if (x >= __START_KERNEL_map) {
+ x -= __START_KERNEL_map;
+ VIRTUAL_BUG_ON(x >= KERNEL_IMAGE_SIZE);
+ x += phys_base;
+ } else {
+ VIRTUAL_BUG_ON(x < PAGE_OFFSET);
+ x -= PAGE_OFFSET;
+ VIRTUAL_BUG_ON(!phys_addr_valid(x));
+ }
+ return x;
+}
+EXPORT_SYMBOL(__phys_addr);
+
+bool __virt_addr_valid(unsigned long x)
+{
+ if (x >= __START_KERNEL_map) {
+ x -= __START_KERNEL_map;
+ if (x >= KERNEL_IMAGE_SIZE)
+ return false;
+ x += phys_base;
+ } else {
+ if (x < PAGE_OFFSET)
+ return false;
+ x -= PAGE_OFFSET;
+ if (!phys_addr_valid(x))
+ return false;
+ }
+
+ return pfn_valid(x >> PAGE_SHIFT);
+}
+EXPORT_SYMBOL(__virt_addr_valid);
+
+#else
+
+#ifdef CONFIG_DEBUG_VIRTUAL
+unsigned long __phys_addr(unsigned long x)
+{
+ /* VMALLOC_* aren't constants */
+ VIRTUAL_BUG_ON(x < PAGE_OFFSET);
+ VIRTUAL_BUG_ON(__vmalloc_start_set && is_vmalloc_addr((void *) x));
return x - PAGE_OFFSET;
}
EXPORT_SYMBOL(__phys_addr);
+#endif
+
+bool __virt_addr_valid(unsigned long x)
+{
+ if (x < PAGE_OFFSET)
+ return false;
+ if (__vmalloc_start_set && is_vmalloc_addr((void *) x))
+ return false;
+ if (x >= FIXADDR_START)
+ return false;
+ return pfn_valid((x - PAGE_OFFSET) >> PAGE_SHIFT);
+}
+EXPORT_SYMBOL(__virt_addr_valid);
#endif
int page_is_ram(unsigned long pagenr)
{
- unsigned long addr, end;
+ resource_size_t addr, end;
int i;
/*
* 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 _PAGE_CACHE_WC:
+ err = _set_memory_wc(vaddr, nrpages);
break;
- case IOR_MODE_CACHED:
- err = set_memory_wb(vaddr, nrpages);
+ case _PAGE_CACHE_WB:
+ err = _set_memory_wb(vaddr, nrpages);
break;
}
* 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(unsigned long 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 pfn, offset, vaddr;
+ resource_size_t 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);
/*
+ * Check if the request spans more than any BAR in the iomem resource
+ * tree.
+ */
+ WARN_ONCE(iomem_map_sanity_check(phys_addr, size),
+ KERN_INFO "Info: mapping multiple BARs. Your kernel is fine.");
+
+ /*
* 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;
- }
+ for (pfn = phys_addr >> PAGE_SHIFT;
+ (pfn << PAGE_SHIFT) < (last_addr & PAGE_MASK);
+ pfn++) {
- switch (mode) {
- case IOR_MODE_UNCACHED:
- default:
- prot = PAGE_KERNEL_NOCACHE;
- break;
- case IOR_MODE_CACHED:
- prot = PAGE_KERNEL;
- break;
+ int is_ram = page_is_ram(pfn);
+
+ if (is_ram && pfn_valid(pfn) && !PageReserved(pfn_to_page(pfn)))
+ return NULL;
+ WARN_ON_ONCE(is_ram);
}
/*
phys_addr &= 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) {
+ pr_debug("Warning: reserve_memtype returned %d\n", retval);
+ return NULL;
+ }
+
+ if (prot_val != new_prot_val) {
+ /*
+ * Do not fallback to certain memory types with certain
+ * requested type:
+ * - request is uc-, return cannot be write-back
+ * - request is uc-, return cannot be write-combine
+ * - request is write-combine, return cannot be write-back
+ */
+ if ((prot_val == _PAGE_CACHE_UC_MINUS &&
+ (new_prot_val == _PAGE_CACHE_WB ||
+ new_prot_val == _PAGE_CACHE_WC)) ||
+ (prot_val == _PAGE_CACHE_WC &&
+ new_prot_val == _PAGE_CACHE_WB)) {
+ pr_debug(
+ "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);
+ free_memtype(phys_addr, phys_addr + size);
+ return NULL;
+ }
+ 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;
area->phys_addr = phys_addr;
vaddr = (unsigned long) area->addr;
- if (ioremap_page_range(vaddr, vaddr + size, phys_addr, prot)) {
+
+ if (kernel_map_sync_memtype(phys_addr, size, prot_val)) {
+ free_memtype(phys_addr, phys_addr + size);
free_vm_area(area);
return NULL;
}
- if (ioremap_change_attr(vaddr, size, mode) < 0) {
- vunmap(area->addr);
+ if (ioremap_page_range(vaddr, vaddr + size, phys_addr, prot)) {
+ free_memtype(phys_addr, phys_addr + size);
+ free_vm_area(area);
return NULL;
}
- return (void __iomem *) (vaddr + offset);
+ ret_addr = (void __iomem *) (vaddr + offset);
+ mmiotrace_ioremap(unaligned_phys_addr, unaligned_size, ret_addr);
+
+ return ret_addr;
}
/**
*
* Must be freed with iounmap.
*/
-void __iomem *ioremap_nocache(unsigned long 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);
-void __iomem *ioremap_cache(unsigned long phys_addr, unsigned long size)
+/**
+ * ioremap_wc - map memory into CPU space write combined
+ * @offset: 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);
+static void __iomem *ioremap_default(resource_size_t phys_addr,
+ unsigned long size)
+{
+ unsigned long flags;
+ void __iomem *ret;
+ int err;
+
+ /*
+ * - WB for WB-able memory and no other conflicting mappings
+ * - UC_MINUS for non-WB-able memory with no other conflicting mappings
+ * - Inherit from confliting mappings otherwise
+ */
+ err = reserve_memtype(phys_addr, phys_addr + size,
+ _PAGE_CACHE_WB, &flags);
+ if (err < 0)
+ return NULL;
+
+ ret = __ioremap_caller(phys_addr, size, flags,
+ __builtin_return_address(0));
+
+ free_memtype(phys_addr, phys_addr + size);
+ return ret;
+}
+
+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_*
* 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
cpa takes care of the direct mappings. */
read_lock(&vmlist_lock);
for (p = vmlist; p; p = p->next) {
- if (p->addr == addr)
+ if (p->addr == (void __force *)addr)
break;
}
read_unlock(&vmlist_lock);
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);
-int __initdata early_ioremap_debug;
+ addr = (void __force *)ioremap_default(start, PAGE_SIZE);
+ if (addr)
+ addr = (void *)((unsigned long)addr | (phys & ~PAGE_MASK));
+
+ return addr;
+}
+
+void unxlate_dev_mem_ptr(unsigned long phys, void *addr)
+{
+ if (page_is_ram(phys >> PAGE_SHIFT))
+ return;
+
+ iounmap((void __iomem *)((unsigned long)addr & PAGE_MASK));
+ return;
+}
+
+static int __initdata early_ioremap_debug;
static int __init early_ioremap_debug_setup(char *str)
{
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)
{
return &bm_pte[pte_index(addr)];
}
+static unsigned long slot_virt[FIX_BTMAPS_SLOTS] __initdata;
+
void __init early_ioremap_init(void)
{
pmd_t *pmd;
+ int i;
if (early_ioremap_debug)
printk(KERN_INFO "early_ioremap_init()\n");
+ for (i = 0; i < FIX_BTMAPS_SLOTS; i++)
+ slot_virt[i] = __fix_to_virt(FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*i);
+
pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN));
memset(bm_pte, 0, sizeof(bm_pte));
pmd_populate_kernel(&init_mm, pmd, bm_pte);
}
}
-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)
+ phys_addr_t phys, pgprot_t flags)
{
unsigned long addr = __fix_to_virt(idx);
pte_t *pte;
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)
+ phys_addr_t phys, pgprot_t prot)
{
if (after_paging_init)
- set_fixmap(idx, phys);
+ __set_fixmap(idx, phys, prot);
else
- __early_set_fixmap(idx, phys, PAGE_KERNEL);
+ __early_set_fixmap(idx, phys, prot);
}
static inline void __init early_clear_fixmap(enum fixed_addresses idx)
__early_set_fixmap(idx, 0, __pgprot(0));
}
-
-int __initdata early_ioremap_nested;
+static void __iomem *prev_map[FIX_BTMAPS_SLOTS] __initdata;
+static unsigned long prev_size[FIX_BTMAPS_SLOTS] __initdata;
static int __init check_early_ioremap_leak(void)
{
- if (!early_ioremap_nested)
- return 0;
+ int count = 0;
+ int i;
- printk(KERN_WARNING
+ for (i = 0; i < FIX_BTMAPS_SLOTS; i++)
+ if (prev_map[i])
+ count++;
+
+ if (!count)
+ return 0;
+ WARN(1, KERN_WARNING
"Debug warning: early ioremap leak of %d areas detected.\n",
- early_ioremap_nested);
+ count);
printk(KERN_WARNING
- "please boot with early_ioremap_debug and report the dmesg.\n");
- WARN_ON(1);
+ "please boot with early_ioremap_debug and report the dmesg.\n");
return 1;
}
late_initcall(check_early_ioremap_leak);
-void __init *early_ioremap(unsigned long phys_addr, unsigned long size)
+static void __init __iomem *
+__early_ioremap(resource_size_t phys_addr, unsigned long size, pgprot_t prot)
{
- unsigned long offset, last_addr;
- unsigned int nrpages, nesting;
+ unsigned long offset;
+ resource_size_t last_addr;
+ unsigned int nrpages;
enum fixed_addresses idx0, idx;
+ int i, slot;
WARN_ON(system_state != SYSTEM_BOOTING);
- nesting = early_ioremap_nested;
+ slot = -1;
+ for (i = 0; i < FIX_BTMAPS_SLOTS; i++) {
+ if (!prev_map[i]) {
+ slot = i;
+ break;
+ }
+ }
+
+ if (slot < 0) {
+ printk(KERN_INFO "early_iomap(%08llx, %08lx) not found slot\n",
+ (u64)phys_addr, size);
+ WARN_ON(1);
+ return NULL;
+ }
+
if (early_ioremap_debug) {
- printk(KERN_INFO "early_ioremap(%08lx, %08lx) [%d] => ",
- phys_addr, size, nesting);
+ printk(KERN_INFO "early_ioremap(%08llx, %08lx) [%d] => ",
+ (u64)phys_addr, size, slot);
dump_stack();
}
return NULL;
}
- if (nesting >= FIX_BTMAPS_NESTING) {
- WARN_ON(1);
- return NULL;
- }
- early_ioremap_nested++;
+ prev_size[slot] = size;
/*
* Mappings have to be page-aligned
*/
offset = phys_addr & ~PAGE_MASK;
phys_addr &= PAGE_MASK;
- size = PAGE_ALIGN(last_addr) - phys_addr;
+ size = PAGE_ALIGN(last_addr + 1) - phys_addr;
/*
* Mappings have to fit in the FIX_BTMAP area.
/*
* Ok, go for it..
*/
- idx0 = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*nesting;
+ idx0 = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*slot;
idx = idx0;
while (nrpages > 0) {
- early_set_fixmap(idx, phys_addr);
+ early_set_fixmap(idx, phys_addr, prot);
phys_addr += PAGE_SIZE;
--idx;
--nrpages;
}
if (early_ioremap_debug)
- printk(KERN_CONT "%08lx + %08lx\n", offset, fix_to_virt(idx0));
+ printk(KERN_CONT "%08lx + %08lx\n", offset, slot_virt[slot]);
+
+ prev_map[slot] = (void __iomem *)(offset + slot_virt[slot]);
+ return prev_map[slot];
+}
- return (void *) (offset + fix_to_virt(idx0));
+/* Remap an IO device */
+void __init __iomem *
+early_ioremap(resource_size_t phys_addr, unsigned long size)
+{
+ return __early_ioremap(phys_addr, size, PAGE_KERNEL_IO);
}
-void __init early_iounmap(void *addr, unsigned long size)
+/* Remap memory */
+void __init __iomem *
+early_memremap(resource_size_t phys_addr, unsigned long size)
+{
+ return __early_ioremap(phys_addr, size, PAGE_KERNEL);
+}
+
+void __init early_iounmap(void __iomem *addr, unsigned long size)
{
unsigned long virt_addr;
unsigned long offset;
unsigned int nrpages;
enum fixed_addresses idx;
- unsigned int nesting;
+ int i, slot;
+
+ slot = -1;
+ for (i = 0; i < FIX_BTMAPS_SLOTS; i++) {
+ if (prev_map[i] == addr) {
+ slot = i;
+ break;
+ }
+ }
+
+ if (slot < 0) {
+ printk(KERN_INFO "early_iounmap(%p, %08lx) not found slot\n",
+ addr, size);
+ WARN_ON(1);
+ return;
+ }
- nesting = --early_ioremap_nested;
- WARN_ON(nesting < 0);
+ if (prev_size[slot] != size) {
+ printk(KERN_INFO "early_iounmap(%p, %08lx) [%d] size not consistent %08lx\n",
+ addr, size, slot, prev_size[slot]);
+ WARN_ON(1);
+ return;
+ }
if (early_ioremap_debug) {
printk(KERN_INFO "early_iounmap(%p, %08lx) [%d]\n", addr,
- size, nesting);
+ size, slot);
dump_stack();
}
offset = virt_addr & ~PAGE_MASK;
nrpages = PAGE_ALIGN(offset + size - 1) >> PAGE_SHIFT;
- idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*nesting;
+ idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*slot;
while (nrpages > 0) {
early_clear_fixmap(idx);
--idx;
--nrpages;
}
+ prev_map[slot] = NULL;
}
-
-void __this_fixmap_does_not_exist(void)
-{
- WARN_ON(1);
-}
-
-#endif /* CONFIG_X86_32 */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff