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kexec_file: Allow arch-specific memory walking for kexec_add_buffer

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Allow architectures to specify a different memory walking function for
kexec_add_buffer. x86 uses iomem to track reserved memory ranges, but
PowerPC uses the memblock subsystem.

Signed-off-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Acked-by: Dave Young <dyoung@redhat.com>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Thiago Jung Bauermann 2016-11-29 23:45:47 +11:00 • committed by Michael Ellerman
parent 0ab5171b89
commit 60fe3910bb
3 changed files with 50 additions and 25 deletions
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29
include/linux/kexec.h
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@ -148,7 +148,34 @@ struct kexec_file_ops {
kexec_verify_sig_t *verify_sig;
#endif
};
#endif
/**
* struct kexec_buf - parameters for finding a place for a buffer in memory
* @image: kexec image in which memory to search.
* @buffer: Contents which will be copied to the allocated memory.
* @bufsz: Size of @buffer.
* @mem: On return will have address of the buffer in memory.
* @memsz: Size for the buffer in memory.
* @buf_align: Minimum alignment needed.
* @buf_min: The buffer can't be placed below this address.
* @buf_max: The buffer can't be placed above this address.
* @top_down: Allocate from top of memory.
*/
struct kexec_buf {
struct kimage *image;
char *buffer;
unsigned long bufsz;
unsigned long mem;
unsigned long memsz;
unsigned long buf_align;
unsigned long buf_min;
unsigned long buf_max;
bool top_down;
};
int __weak arch_kexec_walk_mem(struct kexec_buf *kbuf,
int (*func)(u64, u64, void *));
#endif /* CONFIG_KEXEC_FILE */
struct kimage {
kimage_entry_t head;