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Tue, 14 Nov 2023 04:17:10 -0500 X-MC-Unique: PljBhzhMNE6KZtfoQgWXVg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 505471C05149; Tue, 14 Nov 2023 09:17:10 +0000 (UTC) Received: from MiWiFi-R3L-srv.redhat.com (unknown [10.72.112.231]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4199D2166B26; Tue, 14 Nov 2023 09:17:05 +0000 (UTC) From: Baoquan He To: linux-kernel@vger.kernel.org Subject: [PATCH 1/2] resource: add walk_system_ram_res_rev() Date: Tue, 14 Nov 2023 17:16:57 +0800 Message-ID: <20231114091658.228030-2-bhe@redhat.com> In-Reply-To: <20231114091658.228030-1-bhe@redhat.com> References: <20231114091658.228030-1-bhe@redhat.com> MIME-Version: 1.0 Content-type: text/plain Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.6 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-s390@vger.kernel.org, Baoquan He , linux-parisc@vger.kernel.org, x86@kernel.org, kexec@lists.infradead.org, takahiro.akashi@linaro.org, ebiederm@xmission.com, linux-riscv@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, akpm@linux-foundation.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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 to load kernel, initrd etc when preparing kexec reboot. Signed-off-by: AKASHI Takahiro Signed-off-by: Baoquan He --- include/linux/ioport.h | 3 +++ kernel/resource.c | 61 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 64 insertions(+) diff --git a/include/linux/ioport.h b/include/linux/ioport.h index 14f5cfabbbc8..db7fe25f3370 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -331,6 +331,9 @@ 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 866ef3663a0b..12bce44a2c08 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -27,6 +27,8 @@ #include #include #include +#include +#include #include @@ -429,6 +431,65 @@ int walk_system_ram_res(u64 start, u64 end, void *arg, func); } +/* + * 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 *)) +{ + struct resource res, *rams; + int rams_size = 16, i; + unsigned long flags; + int ret = -1; + + /* create a list */ + rams = kvcalloc(rams_size, sizeof(struct resource), GFP_KERNEL); + if (!rams) + return ret; + + flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; + i = 0; + while ((start < end) && + (!find_next_iomem_res(start, end, flags, IORES_DESC_NONE, &res))) { + if (i >= rams_size) { + /* re-alloc */ + struct resource *rams_new; + int rams_new_size; + + rams_new_size = rams_size + 16; + rams_new = kvcalloc(rams_new_size, sizeof(struct resource), + GFP_KERNEL); + if (!rams_new) + goto out; + + memcpy(rams_new, rams, + sizeof(struct resource) * rams_size); + kvfree(rams); + rams = rams_new; + rams_size = rams_new_size; + } + + rams[i].start = res.start; + rams[i++].end = res.end; + + start = res.end + 1; + } + + /* go reverse */ + for (i--; i >= 0; i--) { + ret = (*func)(&rams[i], arg); + if (ret) + break; + } + +out: + kvfree(rams); + return ret; +} + /* * This function calls the @func callback against all memory ranges, which * are ranges marked as IORESOURCE_MEM and IORESOUCE_BUSY. -- 2.41.0