From patchwork Thu Jan 24 01:28:54 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joonsoo Kim X-Patchwork-Id: 2027631 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork2.kernel.org (Postfix) with ESMTP id 511F8E00CF for ; Thu, 24 Jan 2013 01:33:20 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TyBdV-0006h4-Up; Thu, 24 Jan 2013 01:29:49 +0000 Received: from lgemrelse1q.lge.com ([156.147.1.111]) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TyBd1-0006d9-1y for linux-arm-kernel@lists.infradead.org; Thu, 24 Jan 2013 01:29:22 +0000 X-AuditID: 9c93016f-b7b70ae000000e36-c8-51008e63e1b7 Received: from js1304-P5Q-DELUXE.LGE.NET ( [10.177.222.136]) by LGEMRELSE1Q.lge.com (Symantec Brightmail Gateway) with SMTP id E5.9A.03638.36E80015; Thu, 24 Jan 2013 10:29:07 +0900 (KST) From: Joonsoo Kim To: Russell King Subject: [PATCH v3 3/3] ARM: mm: use static_vm for managing static mapped areas Date: Thu, 24 Jan 2013 10:28:54 +0900 Message-Id: <1358990934-4893-4-git-send-email-iamjoonsoo.kim@lge.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1358990934-4893-1-git-send-email-iamjoonsoo.kim@lge.com> References: <1358990934-4893-1-git-send-email-iamjoonsoo.kim@lge.com> X-Brightmail-Tracker: AAAAAA== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130123_202919_660694_DDF10823 X-CRM114-Status: GOOD ( 20.18 ) X-Spam-Score: -4.9 (----) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-4.9 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [156.147.1.111 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -0.7 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: js1304@gmail.com, Nicolas Pitre , Catalin Marinas , Will Deacon , linux-kernel@vger.kernel.org, Joonsoo Kim , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Joonsoo Kim 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. Signed-off-by: Joonsoo Kim Signed-off-by: Joonsoo Kim diff --git a/arch/arm/include/asm/mach/static_vm.h b/arch/arm/include/asm/mach/static_vm.h index 72c8339..24672b1 100644 --- a/arch/arm/include/asm/mach/static_vm.h +++ b/arch/arm/include/asm/mach/static_vm.h @@ -32,6 +32,12 @@ struct static_vm { const void *caller; }; +#define STATIC_VM_MEM 0x00000001 +#define STATIC_VM_EMPTY 0x00000002 + +/* mtype should be less than 28 */ +#define STATIC_VM_MTYPE(mt) (1UL << ((mt) + 4)) + extern struct static_vm *static_vmlist; extern spinlock_t static_vmlist_lock; diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c index 88fd86c..2c0d3a1 100644 --- a/arch/arm/mm/ioremap.c +++ b/arch/arm/mm/ioremap.c @@ -36,6 +36,7 @@ #include #include +#include #include #include "mm.h" @@ -197,7 +198,8 @@ 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 /* @@ -219,24 +221,17 @@ 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 *static_vm; + + static_vm = find_static_vm_paddr(__pfn_to_phys(pfn), size, + STATIC_VM_MEM | STATIC_VM_MTYPE(mtype)); + if (static_vm) { + addr = (unsigned long)static_vm->vaddr; + addr += paddr - static_vm->paddr; + return (void __iomem *) (offset + addr); + } } - read_unlock(&vmlist_lock); /* * Don't allow RAM to be mapped - this causes problems with ARMv6+ @@ -248,7 +243,7 @@ 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 && @@ -346,34 +341,20 @@ __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; - - 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; - } + struct static_vm *static_vm; + + static_vm = find_static_vm_vaddr(addr); + if (static_vm) + return; + #if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE) - /* - * 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)) { + { + struct vm_struct *vm; + vm = find_vm_area(addr); + 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/mm.h b/arch/arm/mm/mm.h index a8ee92d..3ae75e5 100644 --- a/arch/arm/mm/mm.h +++ b/arch/arm/mm/mm.h @@ -52,16 +52,6 @@ extern void __flush_dcache_page(struct address_space *mapping, struct page *page /* (super)section-mapped I/O regions used by ioremap()/iounmap() */ #define VM_ARM_SECTION_MAPPING 0x80000000 -/* permanent static mappings from iotable_init() */ -#define VM_ARM_STATIC_MAPPING 0x40000000 - -/* empty mapping */ -#define VM_ARM_EMPTY_MAPPING 0x20000000 - -/* mapping type (attributes) for permanent static mappings */ -#define VM_ARM_MTYPE(mt) ((mt) << 20) -#define VM_ARM_MTYPE_MASK (0x1f << 20) - /* consistent regions used by dma_alloc_attrs() */ #define VM_ARM_DMA_CONSISTENT 0x20000000 diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index 9f06102..b799b69 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -31,6 +31,7 @@ #include #include +#include #include #include "mm.h" @@ -757,21 +758,28 @@ void __init iotable_init(struct map_desc *io_desc, int nr) { struct map_desc *md; struct vm_struct *vm; + struct static_vm *static_vm; if (!nr) return; vm = early_alloc_aligned(sizeof(*vm) * nr, __alignof__(*vm)); + static_vm = early_alloc_aligned(sizeof(*static_vm) * nr, + __alignof__(*static_vm)); for (md = io_desc; nr; md++, nr--) { create_mapping(md); + 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->flags = VM_IOREMAP; vm->caller = iotable_init; + + init_static_vm(static_vm, vm, STATIC_VM_MEM | + STATIC_VM_MTYPE(md->type)); vm_area_add_early(vm++); + insert_static_vm(static_vm++); } } @@ -779,13 +787,20 @@ void __init vm_reserve_area_early(unsigned long addr, unsigned long size, void *caller) { struct vm_struct *vm; + struct static_vm *static_vm; vm = early_alloc_aligned(sizeof(*vm), __alignof__(*vm)); + static_vm = early_alloc_aligned(sizeof(*static_vm), + __alignof__(*static_vm)); + vm->addr = (void *)addr; vm->size = size; - vm->flags = VM_IOREMAP | VM_ARM_EMPTY_MAPPING; + vm->flags = VM_IOREMAP; vm->caller = caller; + + init_static_vm(static_vm, vm, STATIC_VM_EMPTY); vm_area_add_early(vm); + insert_static_vm(static_vm); } #ifndef CONFIG_ARM_LPAE @@ -810,15 +825,19 @@ static void __init pmd_empty_section_gap(unsigned long addr) static void __init fill_pmd_gaps(void) { - struct vm_struct *vm; + struct static_vm *area; 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; - addr = (unsigned long)vm->addr; + /* + * We should not take a lock here, because pmd_empty_section_gap() + * invokes vm_reserve_area_early(), and then it call insert_static_vm() + * which try to take a lock. + * We're still single thread, so traverse whole list without a lock + * is safe for now. And inserting new entry is also safe. + */ + for (area = static_vmlist; area; area = area->next) { + addr = (unsigned long)area->vaddr; if (addr < next) continue; @@ -838,7 +857,7 @@ static void __init fill_pmd_gaps(void) * If so and the second section entry for this PMD is empty * then we block the corresponding virtual address. */ - addr += vm->size; + addr += area->size; if ((addr & ~PMD_MASK) == SECTION_SIZE) { pmd = pmd_off_k(addr) + 1; if (pmd_none(*pmd)) @@ -857,19 +876,12 @@ static void __init fill_pmd_gaps(void) #if defined(CONFIG_PCI) && !defined(CONFIG_NEED_MACH_IO_H) static void __init pci_reserve_io(void) { - struct vm_struct *vm; - unsigned long addr; + struct static_vm *static_vm; - /* 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; + static_vm = find_static_vm_vaddr((void *)PCI_IO_VIRT_BASE); + if (static_vm) + return; - } vm_reserve_area_early(PCI_IO_VIRT_BASE, SZ_2M, pci_reserve_io); } #else