From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AE861C433E3 for ; Thu, 21 May 2020 09:35:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9790320721 for ; Thu, 21 May 2020 09:35:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728957AbgEUJfV (ORCPT ); Thu, 21 May 2020 05:35:21 -0400 Received: from szxga06-in.huawei.com ([45.249.212.32]:49220 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728848AbgEUJfQ (ORCPT ); Thu, 21 May 2020 05:35:16 -0400 Received: from DGGEMS406-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id AD4AC7E62D4E8D9E15F8; Thu, 21 May 2020 17:35:12 +0800 (CST) Received: from localhost.localdomain.localdomain (10.175.113.25) by DGGEMS406-HUB.china.huawei.com (10.3.19.206) with Microsoft SMTP Server id 14.3.487.0; Thu, 21 May 2020 17:35:03 +0800 From: Chen Zhou To: , , , , , , CC: , , , , , , , , , , Subject: [PATCH v8 3/5] arm64: kdump: add memory for devices by DT property, low-memory-range Date: Thu, 21 May 2020 17:38:03 +0800 Message-ID: <20200521093805.64398-4-chenzhou10@huawei.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200521093805.64398-1-chenzhou10@huawei.com> References: <20200521093805.64398-1-chenzhou10@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.175.113.25] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If we want to reserve crashkernel above 4G, we could use parameters "crashkernel=X crashkernel=Y,low", in this case, specified size low memory is reserved for crash dump kernel devices and never mapped by the first kernel. This memory range is advertised to crash dump kernel via DT property under /chosen, linux,low-memory-range= Crash dump kernel reads this property at boot time and call memblock_add() after memblock_cap_memory_range() has been called. Signed-off-by: Chen Zhou Tested-by: John Donnelly Tested-by: Prabhakar Kushwaha --- arch/arm64/mm/init.c | 30 +++++++++++++++++++++++++++++- 1 file changed, 29 insertions(+), 1 deletion(-) diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index 71498acf0cd8..fcc3abee7003 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -323,6 +323,26 @@ static int __init early_mem(char *p) } early_param("mem", early_mem); +static int __init early_init_dt_scan_lowmem(unsigned long node, + const char *uname, int depth, void *data) +{ + struct memblock_region *lowmem = data; + const __be32 *reg; + int len; + + if (depth != 1 || strcmp(uname, "chosen") != 0) + return 0; + + reg = of_get_flat_dt_prop(node, "linux,low-memory-range", &len); + if (!reg || (len < (dt_root_addr_cells + dt_root_size_cells))) + return 1; + + lowmem->base = dt_mem_next_cell(dt_root_addr_cells, ®); + lowmem->size = dt_mem_next_cell(dt_root_size_cells, ®); + + return 1; +} + static int __init early_init_dt_scan_usablemem(unsigned long node, const char *uname, int depth, void *data) { @@ -353,13 +373,21 @@ static void __init fdt_enforce_memory_region(void) if (reg.size) memblock_cap_memory_range(reg.base, reg.size); + + of_scan_flat_dt(early_init_dt_scan_lowmem, ®); + + if (reg.size) + memblock_add(reg.base, reg.size); } void __init arm64_memblock_init(void) { const s64 linear_region_size = BIT(vabits_actual - 1); - /* Handle linux,usable-memory-range property */ + /* + * Handle linux,usable-memory-range and linux,low-memory-range + * properties. + */ fdt_enforce_memory_region(); /* Remove memory above our supported physical address size */ -- 2.20.1 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CE387C433E0 for ; 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Thu, 21 May 2020 17:35:03 +0800 From: Chen Zhou To: , , , , , , Subject: [PATCH v8 3/5] arm64: kdump: add memory for devices by DT property, low-memory-range Date: Thu, 21 May 2020 17:38:03 +0800 Message-ID: <20200521093805.64398-4-chenzhou10@huawei.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200521093805.64398-1-chenzhou10@huawei.com> References: <20200521093805.64398-1-chenzhou10@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.113.25] X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200521_023514_570804_C3316EBA X-CRM114-Status: GOOD ( 11.85 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: John.p.donnelly@oracle.com, arnd@arndb.de, devicetree@vger.kernel.org, chenzhou10@huawei.com, linux-doc@vger.kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, horms@verge.net.au, guohanjun@huawei.com, pkushwaha@marvell.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org If we want to reserve crashkernel above 4G, we could use parameters "crashkernel=X crashkernel=Y,low", in this case, specified size low memory is reserved for crash dump kernel devices and never mapped by the first kernel. This memory range is advertised to crash dump kernel via DT property under /chosen, linux,low-memory-range= Crash dump kernel reads this property at boot time and call memblock_add() after memblock_cap_memory_range() has been called. Signed-off-by: Chen Zhou Tested-by: John Donnelly Tested-by: Prabhakar Kushwaha --- arch/arm64/mm/init.c | 30 +++++++++++++++++++++++++++++- 1 file changed, 29 insertions(+), 1 deletion(-) diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index 71498acf0cd8..fcc3abee7003 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -323,6 +323,26 @@ static int __init early_mem(char *p) } early_param("mem", early_mem); +static int __init early_init_dt_scan_lowmem(unsigned long node, + const char *uname, int depth, void *data) +{ + struct memblock_region *lowmem = data; + const __be32 *reg; + int len; + + if (depth != 1 || strcmp(uname, "chosen") != 0) + return 0; + + reg = of_get_flat_dt_prop(node, "linux,low-memory-range", &len); + if (!reg || (len < (dt_root_addr_cells + dt_root_size_cells))) + return 1; + + lowmem->base = dt_mem_next_cell(dt_root_addr_cells, ®); + lowmem->size = dt_mem_next_cell(dt_root_size_cells, ®); + + return 1; +} + static int __init early_init_dt_scan_usablemem(unsigned long node, const char *uname, int depth, void *data) { @@ -353,13 +373,21 @@ static void __init fdt_enforce_memory_region(void) if (reg.size) memblock_cap_memory_range(reg.base, reg.size); + + of_scan_flat_dt(early_init_dt_scan_lowmem, ®); + + if (reg.size) + memblock_add(reg.base, reg.size); } void __init arm64_memblock_init(void) { const s64 linear_region_size = BIT(vabits_actual - 1); - /* Handle linux,usable-memory-range property */ + /* + * Handle linux,usable-memory-range and linux,low-memory-range + * properties. + */ fdt_enforce_memory_region(); /* Remove memory above our supported physical address size */ -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: From: Chen Zhou Subject: [PATCH v8 3/5] arm64: kdump: add memory for devices by DT property, low-memory-range Date: Thu, 21 May 2020 17:38:03 +0800 Message-ID: <20200521093805.64398-4-chenzhou10@huawei.com> In-Reply-To: <20200521093805.64398-1-chenzhou10@huawei.com> References: <20200521093805.64398-1-chenzhou10@huawei.com> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: tglx@linutronix.de, mingo@redhat.com, catalin.marinas@arm.com, will@kernel.org, dyoung@redhat.com, bhe@redhat.com, robh+dt@kernel.org Cc: John.p.donnelly@oracle.com, arnd@arndb.de, devicetree@vger.kernel.org, chenzhou10@huawei.com, linux-doc@vger.kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, horms@verge.net.au, guohanjun@huawei.com, pkushwaha@marvell.com, linux-arm-kernel@lists.infradead.org If we want to reserve crashkernel above 4G, we could use parameters "crashkernel=X crashkernel=Y,low", in this case, specified size low memory is reserved for crash dump kernel devices and never mapped by the first kernel. This memory range is advertised to crash dump kernel via DT property under /chosen, linux,low-memory-range= Crash dump kernel reads this property at boot time and call memblock_add() after memblock_cap_memory_range() has been called. Signed-off-by: Chen Zhou Tested-by: John Donnelly Tested-by: Prabhakar Kushwaha --- arch/arm64/mm/init.c | 30 +++++++++++++++++++++++++++++- 1 file changed, 29 insertions(+), 1 deletion(-) diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index 71498acf0cd8..fcc3abee7003 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -323,6 +323,26 @@ static int __init early_mem(char *p) } early_param("mem", early_mem); +static int __init early_init_dt_scan_lowmem(unsigned long node, + const char *uname, int depth, void *data) +{ + struct memblock_region *lowmem = data; + const __be32 *reg; + int len; + + if (depth != 1 || strcmp(uname, "chosen") != 0) + return 0; + + reg = of_get_flat_dt_prop(node, "linux,low-memory-range", &len); + if (!reg || (len < (dt_root_addr_cells + dt_root_size_cells))) + return 1; + + lowmem->base = dt_mem_next_cell(dt_root_addr_cells, ®); + lowmem->size = dt_mem_next_cell(dt_root_size_cells, ®); + + return 1; +} + static int __init early_init_dt_scan_usablemem(unsigned long node, const char *uname, int depth, void *data) { @@ -353,13 +373,21 @@ static void __init fdt_enforce_memory_region(void) if (reg.size) memblock_cap_memory_range(reg.base, reg.size); + + of_scan_flat_dt(early_init_dt_scan_lowmem, ®); + + if (reg.size) + memblock_add(reg.base, reg.size); } void __init arm64_memblock_init(void) { const s64 linear_region_size = BIT(vabits_actual - 1); - /* Handle linux,usable-memory-range property */ + /* + * Handle linux,usable-memory-range and linux,low-memory-range + * properties. + */ fdt_enforce_memory_region(); /* Remove memory above our supported physical address size */ -- 2.20.1 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec