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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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7e01b5acd8
Introduce KEXEC_CONTROL_MEMORY_GFP to allow the architecture code to override the gfp flags of the allocation for the kexec control page. The loop in kimage_alloc_normal_control_pages allocates pages with GFP_KERNEL until a page is found that happens to have an address smaller than the KEXEC_CONTROL_MEMORY_LIMIT. On systems with a large memory size but a small KEXEC_CONTROL_MEMORY_LIMIT the loop will keep allocating memory until the oom killer steps in. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
/*
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* Copyright IBM Corp. 2005
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*
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* Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
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*
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*/
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#ifndef _S390_KEXEC_H
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#define _S390_KEXEC_H
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#include <asm/processor.h>
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#include <asm/page.h>
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/*
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* KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
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* I.e. Maximum page that is mapped directly into kernel memory,
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* and kmap is not required.
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*/
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/* Maximum physical address we can use pages from */
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#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
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/* Maximum address we can reach in physical address mode */
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#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
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/* Maximum address we can use for the control pages */
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/* Not more than 2GB */
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#define KEXEC_CONTROL_MEMORY_LIMIT (1UL<<31)
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/* Allocate control page with GFP_DMA */
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#define KEXEC_CONTROL_MEMORY_GFP GFP_DMA
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/* Maximum address we can use for the crash control pages */
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#define KEXEC_CRASH_CONTROL_MEMORY_LIMIT (-1UL)
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/* Allocate one page for the pdp and the second for the code */
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#define KEXEC_CONTROL_PAGE_SIZE 4096
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/* Alignment of crashkernel memory */
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#define KEXEC_CRASH_MEM_ALIGN HPAGE_SIZE
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/* The native architecture */
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#define KEXEC_ARCH KEXEC_ARCH_S390
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/*
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* Size for s390x ELF notes per CPU
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*
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* Seven notes plus zero note at the end: prstatus, fpregset, timer,
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* tod_cmp, tod_reg, control regs, and prefix
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*/
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#define KEXEC_NOTE_BYTES \
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(ALIGN(sizeof(struct elf_note), 4) * 8 + \
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ALIGN(sizeof("CORE"), 4) * 7 + \
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ALIGN(sizeof(struct elf_prstatus), 4) + \
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ALIGN(sizeof(elf_fpregset_t), 4) + \
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ALIGN(sizeof(u64), 4) + \
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ALIGN(sizeof(u64), 4) + \
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ALIGN(sizeof(u32), 4) + \
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ALIGN(sizeof(u64) * 16, 4) + \
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ALIGN(sizeof(u32), 4) \
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)
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/* Provide a dummy definition to avoid build failures. */
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static inline void crash_setup_regs(struct pt_regs *newregs,
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struct pt_regs *oldregs) { }
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#endif /*_S390_KEXEC_H */
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