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b5416ca9f8
We are seeing boot fails on some System p machines when using the kdump
crashkernel= boot option. The default kdump base address is 32MB, so if we
reserve 256MB for kdump then we reserve all of the RMO except the first 32MB.
We really want kdump to reserve some memory in the RMO and most of it
elsewhere but that will require more significant changes. For now we can shift
the default base address to 64MB when CONFIG_PPC64 and CONFIG_RELOCATABLE are
set. This isn't quite correct since what we really care about is the kdump
kernel is relocatable, but we already make the assumption that base kernel
and kdump kernel have the same CONFIG_RELOCATABLE setting, eg:
#ifndef CONFIG_RELOCATABLE
if (crashk_res.start != KDUMP_KERNELBASE)
printk("Crash kernel location must be 0x%x\n",
KDUMP_KERNELBASE);
...
RTAS is instantiated towards the top of our RMO, so if we were to go any
higher we risk not having enough RMO memory for the kdump kernel on boxes
with a 128MB RMO.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
#ifndef _PPC64_KDUMP_H
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#define _PPC64_KDUMP_H
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#include <asm/page.h>
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/*
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* If CONFIG_RELOCATABLE is enabled we can place the kdump kernel anywhere.
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* To keep enough space in the RMO for the first stage kernel on 64bit, we
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* place it at 64MB. If CONFIG_RELOCATABLE is not enabled we must place
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* the second stage at 32MB.
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*/
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#if defined(CONFIG_RELOCATABLE) && defined(CONFIG_PPC64)
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#define KDUMP_KERNELBASE 0x4000000
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#else
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#define KDUMP_KERNELBASE 0x2000000
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#endif
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/* How many bytes to reserve at zero for kdump. The reserve limit should
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* be greater or equal to the trampoline's end address.
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* Reserve to the end of the FWNMI area, see head_64.S */
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#define KDUMP_RESERVE_LIMIT 0x10000 /* 64K */
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#ifdef CONFIG_CRASH_DUMP
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/*
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* On PPC64 translation is disabled during trampoline setup, so we use
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* physical addresses. Though on PPC32 translation is already enabled,
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* so we can't do the same. Luckily create_trampoline() creates relative
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* branches, so we can just add the PAGE_OFFSET and don't worry about it.
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*/
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#ifdef __powerpc64__
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#define KDUMP_TRAMPOLINE_START 0x0100
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#define KDUMP_TRAMPOLINE_END 0x3000
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#else
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#define KDUMP_TRAMPOLINE_START (0x0100 + PAGE_OFFSET)
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#define KDUMP_TRAMPOLINE_END (0x3000 + PAGE_OFFSET)
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#endif /* __powerpc64__ */
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#define KDUMP_MIN_TCE_ENTRIES 2048
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#endif /* CONFIG_CRASH_DUMP */
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#ifndef __ASSEMBLY__
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#if defined(CONFIG_CRASH_DUMP) && !defined(CONFIG_RELOCATABLE)
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extern void reserve_kdump_trampoline(void);
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extern void setup_kdump_trampoline(void);
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#else
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/* !CRASH_DUMP || RELOCATABLE */
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static inline void reserve_kdump_trampoline(void) { ; }
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static inline void setup_kdump_trampoline(void) { ; }
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __PPC64_KDUMP_H */
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