From: Chen Zhou <chenzhou10@huawei.com>
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: <arnd@arndb.de>, <John.p.donnelly@oracle.com>,
<pkushwaha@marvell.com>, <horms@verge.net.au>,
<guohanjun@huawei.com>, <chenzhou10@huawei.com>,
<linux-arm-kernel@lists.infradead.org>,
<devicetree@vger.kernel.org>, <linux-doc@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <kexec@lists.infradead.org>
Subject: [PATCH v8 2/5] arm64: kdump: reserve crashkenel above 4G for crash dump kernel
Date: Thu, 21 May 2020 17:38:02 +0800 [thread overview]
Message-ID: <20200521093805.64398-3-chenzhou10@huawei.com> (raw)
In-Reply-To: <20200521093805.64398-1-chenzhou10@huawei.com>
Crashkernel=X tries to reserve memory for the crash dump kernel under
4G. If crashkernel=X,low is specified simultaneously, reserve spcified
size low memory for crash kdump kernel devices firstly and then reserve
memory above 4G.
Signed-off-by: Chen Zhou <chenzhou10@huawei.com>
Tested-by: John Donnelly <John.p.donnelly@oracle.com>
Tested-by: Prabhakar Kushwaha <pkushwaha@marvell.com>
---
arch/arm64/kernel/setup.c | 8 +++++++-
arch/arm64/mm/init.c | 31 +++++++++++++++++++++++++++++--
2 files changed, 36 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 3fd2c11c09fc..a8487e4d3e5a 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -238,7 +238,13 @@ static void __init request_standard_resources(void)
kernel_data.end <= res->end)
request_resource(res, &kernel_data);
#ifdef CONFIG_KEXEC_CORE
- /* Userspace will find "Crash kernel" region in /proc/iomem. */
+ /*
+ * Userspace will find "Crash kernel" region in /proc/iomem.
+ * Note: the low region is renamed as Crash kernel (low).
+ */
+ if (crashk_low_res.end && crashk_low_res.start >= res->start &&
+ crashk_low_res.end <= res->end)
+ request_resource(res, &crashk_low_res);
if (crashk_res.end && crashk_res.start >= res->start &&
crashk_res.end <= res->end)
request_resource(res, &crashk_res);
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index e42727e3568e..71498acf0cd8 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -81,6 +81,7 @@ static void __init reserve_crashkernel(void)
{
unsigned long long crash_base, crash_size;
int ret;
+ phys_addr_t crash_max = arm64_dma32_phys_limit;
ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
&crash_size, &crash_base);
@@ -88,12 +89,38 @@ static void __init reserve_crashkernel(void)
if (ret || !crash_size)
return;
+ ret = reserve_crashkernel_low();
+ if (!ret && crashk_low_res.end) {
+ /*
+ * If crashkernel=X,low specified, there may be two regions,
+ * we need to make some changes as follows:
+ *
+ * 1. rename the low region as "Crash kernel (low)"
+ * In order to distinct from the high region and make no effect
+ * to the use of existing kexec-tools, rename the low region as
+ * "Crash kernel (low)".
+ *
+ * 2. change the upper bound for crash memory
+ * Set MEMBLOCK_ALLOC_ACCESSIBLE upper bound for crash memory.
+ *
+ * 3. mark the low region as "nomap"
+ * The low region is intended to be used for crash dump kernel
+ * devices, just mark the low region as "nomap" simply.
+ */
+ const char *rename = "Crash kernel (low)";
+
+ crashk_low_res.name = rename;
+ crash_max = MEMBLOCK_ALLOC_ACCESSIBLE;
+ memblock_mark_nomap(crashk_low_res.start,
+ resource_size(&crashk_low_res));
+ }
+
crash_size = PAGE_ALIGN(crash_size);
if (crash_base == 0) {
/* Current arm64 boot protocol requires 2MB alignment */
- crash_base = memblock_find_in_range(0, arm64_dma32_phys_limit,
- crash_size, SZ_2M);
+ crash_base = memblock_find_in_range(0, crash_max, crash_size,
+ SZ_2M);
if (crash_base == 0) {
pr_warn("cannot allocate crashkernel (size:0x%llx)\n",
crash_size);
--
2.20.1
next prev parent reply other threads:[~2020-05-21 9:35 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-21 9:38 [PATCH v8 0/5] support reserving crashkernel above 4G on arm64 kdump Chen Zhou
2020-05-21 9:38 ` [PATCH v8 1/5] x86: kdump: move reserve_crashkernel_low() into crash_core.c Chen Zhou
2020-05-26 0:56 ` Baoquan He
2020-05-21 9:38 ` Chen Zhou [this message]
2020-05-26 0:59 ` [PATCH v8 2/5] arm64: kdump: reserve crashkenel above 4G for crash dump kernel Baoquan He
2020-05-21 9:38 ` [PATCH v8 3/5] arm64: kdump: add memory for devices by DT property, low-memory-range Chen Zhou
2020-05-21 9:38 ` [PATCH v8 4/5] kdump: update Documentation about crashkernel on arm64 Chen Zhou
2020-05-21 9:38 ` [PATCH v8 5/5] dt-bindings: chosen: Document linux,low-memory-range for arm64 kdump Chen Zhou
2020-05-21 13:29 ` Rob Herring
2020-05-22 3:24 ` chenzhou
2020-05-26 21:18 ` Rob Herring
2020-05-29 16:11 ` James Morse
2020-06-20 3:54 ` chenzhou
2020-05-26 1:42 ` [PATCH v8 0/5] support reserving crashkernel above 4G on " Baoquan He
2020-05-26 2:28 ` chenzhou
2020-05-28 22:20 ` John Donnelly
2020-05-29 8:05 ` Will Deacon
2020-06-01 12:02 ` Prabhakar Kushwaha
2020-06-01 19:30 ` John Donnelly
2020-06-01 21:02 ` Bhupesh Sharma
2020-06-01 21:59 ` John Donnelly
2020-06-02 5:38 ` Prabhakar Kushwaha
2020-06-02 14:41 ` John Donnelly
2020-06-03 11:47 ` Prabhakar Kushwaha
2020-06-03 13:20 ` chenzhou
2020-06-03 15:30 ` John Donnelly
2020-06-03 19:47 ` Bhupesh Sharma
2020-06-04 7:14 ` Will Deacon
2020-06-04 17:01 ` Nicolas Saenz Julienne
2020-06-05 2:26 ` John Donnelly
2020-06-05 8:21 ` Nicolas Saenz Julienne
2020-06-19 2:32 ` John Donnelly
2020-06-19 8:21 ` chenzhou
2020-06-20 0:01 ` John Donnelly
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