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authorJoonsoo Kim <js1304@gmail.com>2013-02-09 06:28:06 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2013-02-16 18:54:22 +0100
commit101eeda38c0ab8a4f916176e325d9e036d981a24 (patch)
tree874b1f0002c9153e6af28b1ec3dd6aa0e7737086
parentARM: 7645/1: ioremap: introduce an infrastructure for static mapped area (diff)
downloadlinux-101eeda38c0ab8a4f916176e325d9e036d981a24.tar.xz
linux-101eeda38c0ab8a4f916176e325d9e036d981a24.zip
ARM: 7646/1: mm: use static_vm for managing static mapped areas
A static mapped area is ARM-specific, so it is better not to use generic vmalloc data structure, that is, vmlist and vmlist_lock for managing static mapped area. And it causes some needless overhead and reducing this overhead is better idea. Now, we have newly introduced static_vm infrastructure. With it, we don't need to iterate all mapped areas. Instead, we just iterate static mapped areas. It helps to reduce an overhead of finding matched area. And architecture dependency on vmalloc layer is removed, so it will help to maintainability for vmalloc layer. Reviewed-by: Nicolas Pitre <nico@linaro.org> Acked-by: Rob Herring <rob.herring@calxeda.com> Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/mm/ioremap.c71
-rw-r--r--arch/arm/mm/mmu.c34
2 files changed, 46 insertions, 59 deletions
diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c
index 904c15e86063..04d9006eab1f 100644
--- a/arch/arm/mm/ioremap.c
+++ b/arch/arm/mm/ioremap.c
@@ -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
@@ -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+
@@ -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) {
@@ -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);
}
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 9f0610243bd6..a35b314d270d 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -757,21 +757,24 @@ 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++);
}
}
@@ -779,13 +782,16 @@ 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
@@ -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;
@@ -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