From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e23smtp09.au.ibm.com (e23smtp09.au.ibm.com [202.81.31.142]) (using TLSv1.2 with cipher CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3qzWWR57FDzDqml for ; Tue, 3 May 2016 16:30:27 +1000 (AEST) Received: from localhost by e23smtp09.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 3 May 2016 16:30:26 +1000 Received: from d23relay09.au.ibm.com (d23relay09.au.ibm.com [9.185.63.181]) by d23dlp01.au.ibm.com (Postfix) with ESMTP id 198682CE8056 for ; Tue, 3 May 2016 16:30:25 +1000 (EST) Received: from d23av01.au.ibm.com (d23av01.au.ibm.com [9.190.234.96]) by d23relay09.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u436UHNf57213048 for ; Tue, 3 May 2016 16:30:24 +1000 Received: from d23av01.au.ibm.com (localhost [127.0.0.1]) by d23av01.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u436TqxP023305 for ; Tue, 3 May 2016 16:29:52 +1000 From: Anshuman Khandual To: linuxppc-dev@lists.ozlabs.org Cc: aneesh.kumar@linux.vnet.ibm.com, mpe@ellerman.id.au, mikey@neuling.org, oohall@gmail.com Subject: [RFC 5/7] mm/memremap: Export pfn_first, pfn_end, find_pagemap functions Date: Tue, 3 May 2016 11:59:24 +0530 Message-Id: <1462256966-19321-6-git-send-email-khandual@linux.vnet.ibm.com> In-Reply-To: <1462256966-19321-1-git-send-email-khandual@linux.vnet.ibm.com> References: <1462256966-19321-1-git-send-email-khandual@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This change exports two existing functions pfn_first, pfn_end and also defines a new one called find_pagemap. These functions are required to navigate through the memory which is hotplugged into the ZONE_DEVICE as device memory. Signed-off-by: Anshuman Khandual --- include/linux/memremap.h | 18 ++++++++++++++++++ kernel/memremap.c | 15 +++++++++++++-- 2 files changed, 31 insertions(+), 2 deletions(-) diff --git a/include/linux/memremap.h b/include/linux/memremap.h index bcaa634..b193044 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -28,11 +28,29 @@ void vmem_altmap_free(struct vmem_altmap *altmap, unsigned long nr_pfns); #if defined(CONFIG_SPARSEMEM_VMEMMAP) && defined(CONFIG_ZONE_DEVICE) struct vmem_altmap *to_vmem_altmap(unsigned long memmap_start); +struct page_map *find_pagemap(resource_size_t phys); +unsigned long pfn_first(struct page_map *pgmap); +unsigned long pfn_end(struct page_map *pgmap); #else static inline struct vmem_altmap *to_vmem_altmap(unsigned long memmap_start) { return NULL; } + +static inline struct page_map *find_pagemap(resource_size_t phys) +{ + return NULL; +} + +unsigned long pfn_first(struct page_map *pgmap) +{ + return 0; +} + +unsigned long pfn_end(struct page_map *pgmap) +{ + return 0; +} #endif /** diff --git a/kernel/memremap.c b/kernel/memremap.c index a6d3823..3c21051 100644 --- a/kernel/memremap.c +++ b/kernel/memremap.c @@ -207,7 +207,7 @@ static void pgmap_radix_release(struct resource *res) mutex_unlock(&pgmap_lock); } -static unsigned long pfn_first(struct page_map *page_map) +unsigned long pfn_first(struct page_map *page_map) { struct dev_pagemap *pgmap = &page_map->pgmap; const struct resource *res = &page_map->res; @@ -220,7 +220,7 @@ static unsigned long pfn_first(struct page_map *page_map) return pfn; } -static unsigned long pfn_end(struct page_map *page_map) +unsigned long pfn_end(struct page_map *page_map) { const struct resource *res = &page_map->res; @@ -262,6 +262,17 @@ struct dev_pagemap *find_dev_pagemap(resource_size_t phys) return page_map ? &page_map->pgmap : NULL; } +struct page_map *find_pagemap(resource_size_t phys) +{ + struct page_map *page_map; + + rcu_read_lock(); + page_map = radix_tree_lookup(&pgmap_radix, phys >> PA_SECTION_SHIFT); + rcu_read_unlock(); + + return page_map; +} + /** * devm_memremap_pages - remap and provide memmap backing for the given resource * @dev: hosting device for @res -- 1.8.3.1