Traditionally, MIPS's contiguous low memory can be as less as 256M, so
crashkernel=X@Y may be unable to large enough in some cases. Moreover,
for the "multi numa node + sparse memory model" case, it is attempt to
allocate section_mem_maps on every node. Thus, if the total memory of a
node is more than 1GB, we reserve the top 128MB for the crash kernel.
Signed-off-by: Huacai Chen <che...@lemote.com>
---
arch/mips/kernel/setup.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 63 insertions(+)
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index e2804a2..90d4a2e 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -29,6 +29,7 @@
#include <linux/of_fdt.h>
#include <linux/of_reserved_mem.h>
#include <linux/dmi.h>
+#include <linux/crash_dump.h>
#include <asm/addrspace.h>
#include <asm/bootinfo.h>
@@ -55,6 +56,10 @@ EXPORT_SYMBOL(cpu_data);
struct screen_info screen_info;
#endif
+#ifdef CONFIG_CRASH_DUMP
+static phys_addr_t crashmem_start, crashmem_size;
+#endif
+
/*
* Setup information
*
@@ -404,6 +409,13 @@ static int __init early_parse_mem(char *p)
add_memory_region(start, size, BOOT_MEM_RAM);
+#ifdef CONFIG_CRASH_DUMP
+ if (start && size) {
+ crashmem_start = start;
+ crashmem_size = size;
+ }
+#endif
+
return 0;
}
early_param("mem", early_parse_mem);
@@ -642,6 +654,48 @@ static void __init bootcmdline_init(void)
bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
}
+/* Traditionally, MIPS's contiguous low memory is 256M, so crashkernel=X@Y is
+ * unable to be large enough in some cases. Thus, if the total memory of a node
+ * is more than 1GB, we reserve the top 128MB for the crash kernel */
+static void reserve_crashm_region(int node, unsigned long s0, unsigned long e0)
+{
+#ifdef CONFIG_KEXEC
+ if (crashk_res.start == crashk_res.end)
+ return;
+
+ if ((e0 - s0) <= (SZ_1G >> PAGE_SHIFT))
+ return;
+
+ s0 = e0 - (SZ_128M >> PAGE_SHIFT);
+
+ memblock_reserve(PFN_PHYS(s0), (e0 - s0) << PAGE_SHIFT);
+#endif
+}
+
+static void reserve_oldmem_region(int node, unsigned long s0, unsigned long e0)
+{
+#ifdef CONFIG_CRASH_DUMP
+ unsigned long s1, e1;
+
+ if (!is_kdump_kernel())
+ return;
+
+ if ((e0 - s0) > (SZ_1G >> PAGE_SHIFT))
+ e0 = e0 - (SZ_128M >> PAGE_SHIFT);
+
+ /* crashmem_start is crashk_res reserved by primary kernel */
+ s1 = PFN_UP(crashmem_start);
+ e1 = PFN_DOWN(crashmem_start + crashmem_size);
+
+ if (node == 0) {
+ memblock_reserve(PFN_PHYS(s0), (s1 - s0) << PAGE_SHIFT);
+ memblock_reserve(PFN_PHYS(e1), (e0 - e1) << PAGE_SHIFT);
+ } else {
+ memblock_reserve(PFN_PHYS(s0), (e0 - s0) << PAGE_SHIFT);
+ }
+#endif
+}
+
/*
* arch_mem_init - initialize memory management subsystem
*
@@ -666,6 +720,9 @@ static void __init bootcmdline_init(void)
*/
static void __init arch_mem_init(char **cmdline_p)
{
+ unsigned int node;
+ unsigned long start_pfn, end_pfn;
+
/* call board setup routine */
plat_mem_setup();
memblock_set_bottom_up(true);
@@ -711,6 +768,12 @@ static void __init arch_mem_init(char **cmdline_p)
if (crashk_res.start != crashk_res.end)
memblock_reserve(crashk_res.start, resource_size(&crashk_res));
#endif
+ for_each_online_node(node) {
+ get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
+ reserve_crashm_region(node, start_pfn, end_pfn);
+ reserve_oldmem_region(node, start_pfn, end_pfn);
+ }
+
device_tree_init();
/*
--
2.7.0
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