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Message-Id: <20180419001848.3041-3-bhe@redhat.com> Date: Thu, 19 Apr 2018 08:18:47 +0800 From: Baoquan He <bhe@...hat.com> To: linux-kernel@...r.kernel.org, akpm@...ux-foundation.org, robh+dt@...nel.org, dan.j.williams@...el.com, nicolas.pitre@...aro.org, josh@...htriplett.org Cc: Baoquan He <bhe@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, Brijesh Singh <brijesh.singh@....com>, Jérôme Glisse <jglisse@...hat.com>, Borislav Petkov <bp@...e.de>, Tom Lendacky <thomas.lendacky@....com>, Wei Yang <richard.weiyang@...il.com> Subject: [PATCH v3 2/3] resource: add walk_system_ram_res_rev() This function, being a variant of walk_system_ram_res() introduced in commit 8c86e70acead ("resource: provide new functions to walk through resources"), walks through a list of all the resources of System RAM in reversed order, i.e., from higher to lower. It will be used in kexec_file code. Signed-off-by: Baoquan He <bhe@...hat.com> Cc: Andrew Morton <akpm@...ux-foundation.org> Cc: Thomas Gleixner <tglx@...utronix.de> Cc: Brijesh Singh <brijesh.singh@....com> Cc: "Jérôme Glisse" <jglisse@...hat.com> Cc: Borislav Petkov <bp@...e.de> Cc: Tom Lendacky <thomas.lendacky@....com> Cc: Wei Yang <richard.weiyang@...il.com> --- include/linux/ioport.h | 3 +++ kernel/resource.c | 40 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 43 insertions(+) diff --git a/include/linux/ioport.h b/include/linux/ioport.h index 225d13d3500a..5f2cfb460a14 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -278,6 +278,9 @@ extern int walk_system_ram_res(u64 start, u64 end, void *arg, int (*func)(struct resource *, void *)); extern int +walk_system_ram_res_rev(u64 start, u64 end, void *arg, + int (*func)(struct resource *, void *)); +extern int walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start, u64 end, void *arg, int (*func)(struct resource *, void *)); diff --git a/kernel/resource.c b/kernel/resource.c index 4f560991c130..6c519b06e3d6 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -23,6 +23,8 @@ #include <linux/pfn.h> #include <linux/mm.h> #include <linux/resource_ext.h> +#include <linux/string.h> +#include <linux/vmalloc.h> #include <asm/io.h> @@ -475,6 +477,44 @@ int walk_system_ram_res(u64 start, u64 end, void *arg, } /* + * This function, being a variant of walk_system_ram_res(), calls the @func + * callback against all memory ranges of type System RAM which are marked as + * IORESOURCE_SYSTEM_RAM and IORESOUCE_BUSY in reversed order, i.e., from + * higher to lower. + */ +int walk_system_ram_res_rev(u64 start, u64 end, void *arg, + int (*func)(struct resource *, void *)) +{ + unsigned long flags; + struct resource *res; + int ret = -1; + + flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; + + read_lock(&resource_lock); + list_for_each_entry_reverse(res, &iomem_resource.child, sibling) { + if (start >= end) + break; + if ((res->flags & flags) != flags) + continue; + if (res->desc != IORES_DESC_NONE) + continue; + if (res->end < start) + break; + + if ((res->end >= start) && (res->start < end)) { + ret = (*func)(res, arg); + if (ret) + break; + } + end = res->start - 1; + + } + read_unlock(&resource_lock); + return ret; +} + +/* * This function calls the @func callback against all memory ranges, which * are ranges marked as IORESOURCE_MEM and IORESOUCE_BUSY. */ -- 2.13.6
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