Commit dcee3036 authored by Michael Ellerman's avatar Michael Ellerman Committed by Paul Mackerras
Browse files

[PATCH] powerpc: Parse crashkernel= parameter in first kernel



This patch adds code to parse and setup the crash kernel resource in the
first kernel. PPC64 ignores the @x part, we always run at 32 MB.
Signed-off-by: default avatarHaren Myneni <haren@us.ibm.com>
Signed-off-by: default avatarMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent cc532915
......@@ -29,6 +29,7 @@
#include <linux/initrd.h>
#include <linux/bitops.h>
#include <linux/module.h>
#include <linux/kexec.h>
#include <asm/prom.h>
#include <asm/rtas.h>
......@@ -1198,6 +1199,16 @@ static int __init early_init_dt_scan_chosen(unsigned long node,
}
#endif /* CONFIG_PPC_RTAS */
#ifdef CONFIG_KEXEC
lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
if (lprop)
crashk_res.start = *lprop;
lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
if (lprop)
crashk_res.end = crashk_res.start + *lprop - 1;
#endif
/* break now */
return 1;
}
......
......@@ -192,6 +192,11 @@ static unsigned long __initdata alloc_bottom;
static unsigned long __initdata rmo_top;
static unsigned long __initdata ram_top;
#ifdef CONFIG_KEXEC
static unsigned long __initdata prom_crashk_base;
static unsigned long __initdata prom_crashk_size;
#endif
static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
static int __initdata mem_reserve_cnt;
......@@ -590,6 +595,34 @@ static void __init early_cmdline_parse(void)
RELOC(prom_memory_limit) = ALIGN(RELOC(prom_memory_limit), 0x1000000);
#endif
}
#ifdef CONFIG_KEXEC
/*
* crashkernel=size@addr specifies the location to reserve for
* crash kernel.
*/
opt = strstr(RELOC(prom_cmd_line), RELOC("crashkernel="));
if (opt) {
opt += 12;
RELOC(prom_crashk_size) = prom_memparse(opt, &opt);
if (ALIGN(RELOC(prom_crashk_size), 0x1000000) !=
RELOC(prom_crashk_size)) {
prom_printf("Warning: crashkernel size is not "
"aligned to 16MB\n");
}
/*
* At present, the crash kernel always run at 32MB.
* Just ignore whatever user passed.
*/
RELOC(prom_crashk_base) = 0x2000000;
if (*opt == '@') {
prom_printf("Warning: PPC64 kdump kernel always runs "
"at 32 MB\n");
}
}
#endif
}
#ifdef CONFIG_PPC_PSERIES
......@@ -1011,6 +1044,12 @@ static void __init prom_init_mem(void)
prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
prom_printf(" rmo_top : %x\n", RELOC(rmo_top));
prom_printf(" ram_top : %x\n", RELOC(ram_top));
#ifdef CONFIG_KEXEC
if (RELOC(prom_crashk_base)) {
prom_printf(" crashk_base : %x\n", RELOC(prom_crashk_base));
prom_printf(" crashk_size : %x\n", RELOC(prom_crashk_size));
}
#endif
}
......@@ -2094,6 +2133,10 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4,
*/
prom_init_mem();
#ifdef CONFIG_KEXEC
if (RELOC(prom_crashk_base))
reserve_mem(RELOC(prom_crashk_base), RELOC(prom_crashk_size));
#endif
/*
* Determine which cpu is actually running right _now_
*/
......@@ -2150,6 +2193,16 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4,
}
#endif
#ifdef CONFIG_KEXEC
if (RELOC(prom_crashk_base)) {
prom_setprop(_prom->chosen, "/chosen", "linux,crashkernel-base",
PTRRELOC(&prom_crashk_base),
sizeof(RELOC(prom_crashk_base)));
prom_setprop(_prom->chosen, "/chosen", "linux,crashkernel-size",
PTRRELOC(&prom_crashk_size),
sizeof(RELOC(prom_crashk_size)));
}
#endif
/*
* Fixup any known bugs in the device-tree
*/
......
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