ARM: 7645/1: ioremap: introduce an infrastructure for static mapped area (ed8fd218) · Commits · 戴 / test

In current implementation, we used ARM-specific flag, that is, VM_ARM_STATIC_MAPPING, for distinguishing ARM specific static mapped area. The purpose of static mapped area is to re-use static mapped area when entire physical address range of the ioremap request can be covered by this area. This implementation causes needless overhead for some cases. For example, assume that there is only one static mapped area and vmlist has 300 areas. Every time we call ioremap, we check 300 areas for deciding whether it is matched or not. Moreover, even if there is no static mapped area and vmlist has 300 areas, every time we call ioremap, we check 300 areas in now. If we construct a extra list for static mapped area, we can eliminate above mentioned overhead. With a extra list, if there is one static mapped area, we just check only one area and proceed next operation quickly. In fact, it is not a critical problem, because ioremap is not frequently used. But reducing overhead is better idea. Another reason for doing this work is for removing architecture dependency on vmalloc layer. I think that vmlist and vmlist_lock is internal data structure for vmalloc layer. Some codes for debugging and stat inevitably use vmlist and vmlist_lock. But it is preferable that they are used as least as possible in outside of vmalloc.c Now, I introduce an ARM-specific infrastructure for static mapped area. In the following patch, we will use this and resolve above mentioned problem. Reviewed-by:

Nicolas Pitre <nico@linaro.org> 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>

arch/arm/mm/ioremap.c

+64 −0

Original line number	Diff line number	Diff line
		@@ -39,6 +39,70 @@
		#include <asm/mach/pci.h>
		#include "mm.h"


		LIST_HEAD(static_vmlist);

		static struct static_vm *find_static_vm_paddr(phys_addr_t paddr,
		size_t size, unsigned int mtype)
		{
		struct static_vm *svm;
		struct vm_struct *vm;

		list_for_each_entry(svm, &static_vmlist, list) {
		vm = &svm->vm;
		if (!(vm->flags & VM_ARM_STATIC_MAPPING))
		continue;
		if ((vm->flags & VM_ARM_MTYPE_MASK) != VM_ARM_MTYPE(mtype))
		continue;

		if (vm->phys_addr > paddr \|\|
		paddr + size - 1 > vm->phys_addr + vm->size - 1)
		continue;

		return svm;
		}

		return NULL;
		}

		struct static_vm find_static_vm_vaddr(void vaddr)
		{
		struct static_vm *svm;
		struct vm_struct *vm;

		list_for_each_entry(svm, &static_vmlist, list) {
		vm = &svm->vm;

		/* static_vmlist is ascending order */
		if (vm->addr > vaddr)
		break;

		if (vm->addr <= vaddr && vm->addr + vm->size > vaddr)
		return svm;
		}

		return NULL;
		}

		void __init add_static_vm_early(struct static_vm *svm)
		{
		struct static_vm *curr_svm;
		struct vm_struct *vm;
		void *vaddr;

		vm = &svm->vm;
		vm_area_add_early(vm);
		vaddr = vm->addr;

		list_for_each_entry(curr_svm, &static_vmlist, list) {
		vm = &curr_svm->vm;

		if (vm->addr > vaddr)
		break;
		}
		list_add_tail(&svm->list, &curr_svm->list);
		}

		int ioremap_page(unsigned long virt, unsigned long phys,
		const struct mem_type *mtype)
		{

arch/arm/mm/mm.h

+12 −0

Original line number	Diff line number	Diff line
		#ifdef CONFIG_MMU
		#include <linux/list.h>
		#include <linux/vmalloc.h>

		/* the upper-most page table pointer */
		extern pmd_t *top_pmd;
		@@ -65,6 +67,16 @@ extern void __flush_dcache_page(struct address_space mapping, struct page page
		/* consistent regions used by dma_alloc_attrs() */
		#define VM_ARM_DMA_CONSISTENT 0x20000000


		struct static_vm {
		struct vm_struct vm;
		struct list_head list;
		};

		extern struct list_head static_vmlist;
		extern struct static_vm find_static_vm_vaddr(void vaddr);
		extern __init void add_static_vm_early(struct static_vm *svm);

		#endif

		#ifdef CONFIG_ZONE_DMA

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