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yaml
---
r: 351143
b: refs/heads/master
c: 101eeda
h: refs/heads/master
i:
  351141: 7f840fc
  351139: 921132d
  351135: 2759599
v: v3
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Joonsoo Kim authored and Russell King committed Feb 16, 2013
1 parent 0cf7132 commit 808aec5
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Showing 3 changed files with 47 additions and 60 deletions.
2 changes: 1 addition & 1 deletion [refs]
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Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: ed8fd2186a4e4f3b98434093b56f9b793d48443e
refs/heads/master: 101eeda38c0ab8a4f916176e325d9e036d981a24
71 changes: 29 additions & 42 deletions trunk/arch/arm/mm/ioremap.c
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Original file line number Diff line number Diff line change
Expand Up @@ -261,13 +261,14 @@ void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn,
const struct mem_type *type;
int err;
unsigned long addr;
struct vm_struct * area;
struct vm_struct *area;
phys_addr_t paddr = __pfn_to_phys(pfn);

#ifndef CONFIG_ARM_LPAE
/*
* High mappings must be supersection aligned
*/
if (pfn >= 0x100000 && (__pfn_to_phys(pfn) & ~SUPERSECTION_MASK))
if (pfn >= 0x100000 && (paddr & ~SUPERSECTION_MASK))
return NULL;
#endif

Expand All @@ -283,24 +284,16 @@ void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn,
/*
* Try to reuse one of the static mapping whenever possible.
*/
read_lock(&vmlist_lock);
for (area = vmlist; area; area = area->next) {
if (!size || (sizeof(phys_addr_t) == 4 && pfn >= 0x100000))
break;
if (!(area->flags & VM_ARM_STATIC_MAPPING))
continue;
if ((area->flags & VM_ARM_MTYPE_MASK) != VM_ARM_MTYPE(mtype))
continue;
if (__phys_to_pfn(area->phys_addr) > pfn ||
__pfn_to_phys(pfn) + size-1 > area->phys_addr + area->size-1)
continue;
/* we can drop the lock here as we know *area is static */
read_unlock(&vmlist_lock);
addr = (unsigned long)area->addr;
addr += __pfn_to_phys(pfn) - area->phys_addr;
return (void __iomem *) (offset + addr);
if (size && !(sizeof(phys_addr_t) == 4 && pfn >= 0x100000)) {
struct static_vm *svm;

svm = find_static_vm_paddr(paddr, size, mtype);
if (svm) {
addr = (unsigned long)svm->vm.addr;
addr += paddr - svm->vm.phys_addr;
return (void __iomem *) (offset + addr);
}
}
read_unlock(&vmlist_lock);

/*
* Don't allow RAM to be mapped - this causes problems with ARMv6+
Expand All @@ -312,21 +305,21 @@ void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn,
if (!area)
return NULL;
addr = (unsigned long)area->addr;
area->phys_addr = __pfn_to_phys(pfn);
area->phys_addr = paddr;

#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
if (DOMAIN_IO == 0 &&
(((cpu_architecture() >= CPU_ARCH_ARMv6) && (get_cr() & CR_XP)) ||
cpu_is_xsc3()) && pfn >= 0x100000 &&
!((__pfn_to_phys(pfn) | size | addr) & ~SUPERSECTION_MASK)) {
!((paddr | size | addr) & ~SUPERSECTION_MASK)) {
area->flags |= VM_ARM_SECTION_MAPPING;
err = remap_area_supersections(addr, pfn, size, type);
} else if (!((__pfn_to_phys(pfn) | size | addr) & ~PMD_MASK)) {
} else if (!((paddr | size | addr) & ~PMD_MASK)) {
area->flags |= VM_ARM_SECTION_MAPPING;
err = remap_area_sections(addr, pfn, size, type);
} else
#endif
err = ioremap_page_range(addr, addr + size, __pfn_to_phys(pfn),
err = ioremap_page_range(addr, addr + size, paddr,
__pgprot(type->prot_pte));

if (err) {
Expand Down Expand Up @@ -410,34 +403,28 @@ __arm_ioremap_exec(unsigned long phys_addr, size_t size, bool cached)
void __iounmap(volatile void __iomem *io_addr)
{
void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr);
struct vm_struct *vm;
struct static_vm *svm;

/* If this is a static mapping, we must leave it alone */
svm = find_static_vm_vaddr(addr);
if (svm)
return;

read_lock(&vmlist_lock);
for (vm = vmlist; vm; vm = vm->next) {
if (vm->addr > addr)
break;
if (!(vm->flags & VM_IOREMAP))
continue;
/* If this is a static mapping we must leave it alone */
if ((vm->flags & VM_ARM_STATIC_MAPPING) &&
(vm->addr <= addr) && (vm->addr + vm->size > addr)) {
read_unlock(&vmlist_lock);
return;
}
#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
{
struct vm_struct *vm;

vm = find_vm_area(addr);

/*
* If this is a section based mapping we need to handle it
* specially as the VM subsystem does not know how to handle
* such a beast.
*/
if ((vm->addr == addr) &&
(vm->flags & VM_ARM_SECTION_MAPPING)) {
if (vm && (vm->flags & VM_ARM_SECTION_MAPPING))
unmap_area_sections((unsigned long)vm->addr, vm->size);
break;
}
#endif
}
read_unlock(&vmlist_lock);
#endif

vunmap(addr);
}
Expand Down
34 changes: 17 additions & 17 deletions trunk/arch/arm/mm/mmu.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -757,35 +757,41 @@ void __init iotable_init(struct map_desc *io_desc, int nr)
{
struct map_desc *md;
struct vm_struct *vm;
struct static_vm *svm;

if (!nr)
return;

vm = early_alloc_aligned(sizeof(*vm) * nr, __alignof__(*vm));
svm = early_alloc_aligned(sizeof(*svm) * nr, __alignof__(*svm));

for (md = io_desc; nr; md++, nr--) {
create_mapping(md);

vm = &svm->vm;
vm->addr = (void *)(md->virtual & PAGE_MASK);
vm->size = PAGE_ALIGN(md->length + (md->virtual & ~PAGE_MASK));
vm->phys_addr = __pfn_to_phys(md->pfn);
vm->flags = VM_IOREMAP | VM_ARM_STATIC_MAPPING;
vm->flags |= VM_ARM_MTYPE(md->type);
vm->caller = iotable_init;
vm_area_add_early(vm++);
add_static_vm_early(svm++);
}
}

void __init vm_reserve_area_early(unsigned long addr, unsigned long size,
void *caller)
{
struct vm_struct *vm;
struct static_vm *svm;

svm = early_alloc_aligned(sizeof(*svm), __alignof__(*svm));

vm = early_alloc_aligned(sizeof(*vm), __alignof__(*vm));
vm = &svm->vm;
vm->addr = (void *)addr;
vm->size = size;
vm->flags = VM_IOREMAP | VM_ARM_EMPTY_MAPPING;
vm->caller = caller;
vm_area_add_early(vm);
add_static_vm_early(svm);
}

#ifndef CONFIG_ARM_LPAE
Expand All @@ -810,14 +816,13 @@ static void __init pmd_empty_section_gap(unsigned long addr)

static void __init fill_pmd_gaps(void)
{
struct static_vm *svm;
struct vm_struct *vm;
unsigned long addr, next = 0;
pmd_t *pmd;

/* we're still single threaded hence no lock needed here */
for (vm = vmlist; vm; vm = vm->next) {
if (!(vm->flags & (VM_ARM_STATIC_MAPPING | VM_ARM_EMPTY_MAPPING)))
continue;
list_for_each_entry(svm, &static_vmlist, list) {
vm = &svm->vm;
addr = (unsigned long)vm->addr;
if (addr < next)
continue;
Expand Down Expand Up @@ -859,17 +864,12 @@ static void __init pci_reserve_io(void)
{
struct vm_struct *vm;
unsigned long addr;
struct static_vm *svm;

/* we're still single threaded hence no lock needed here */
for (vm = vmlist; vm; vm = vm->next) {
if (!(vm->flags & VM_ARM_STATIC_MAPPING))
continue;
addr = (unsigned long)vm->addr;
addr &= ~(SZ_2M - 1);
if (addr == PCI_IO_VIRT_BASE)
return;
svm = find_static_vm_vaddr((void *)PCI_IO_VIRT_BASE);
if (svm)
return;

}
vm_reserve_area_early(PCI_IO_VIRT_BASE, SZ_2M, pci_reserve_io);
}
#else
Expand Down

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