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