Commit 60fe3910 authored by Thiago Jung Bauermann's avatar Thiago Jung Bauermann Committed by Michael Ellerman

kexec_file: Allow arch-specific memory walking for kexec_add_buffer

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: default avatarThiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Acked-by: default avatarDave Young <dyoung@redhat.com>
Acked-by: default avatarBalbir Singh <bsingharora@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 0ab5171b
......@@ -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;
......
......@@ -428,6 +428,27 @@ static int locate_mem_hole_callback(u64 start, u64 end, void *arg)
return locate_mem_hole_bottom_up(start, end, kbuf);
}
/**
* arch_kexec_walk_mem - call func(data) on free memory regions
* @kbuf: Context info for the search. Also passed to @func.
* @func: Function to call for each memory region.
*
* Return: The memory walk will stop when func returns a non-zero value
* and that value will be returned. If all free regions are visited without
* func returning non-zero, then zero will be returned.
*/
int __weak arch_kexec_walk_mem(struct kexec_buf *kbuf,
int (*func)(u64, u64, void *))
{
if (kbuf->image->type == KEXEC_TYPE_CRASH)
return walk_iomem_res_desc(crashk_res.desc,
IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY,
crashk_res.start, crashk_res.end,
kbuf, func);
else
return walk_system_ram_res(0, ULONG_MAX, kbuf, func);
}
/*
* Helper function for placing a buffer in a kexec segment. This assumes
* that kexec_mutex is held.
......@@ -474,14 +495,7 @@ int kexec_add_buffer(struct kimage *image, char *buffer, unsigned long bufsz,
kbuf->top_down = top_down;
/* Walk the RAM ranges and allocate a suitable range for the buffer */
if (image->type == KEXEC_TYPE_CRASH)
ret = walk_iomem_res_desc(crashk_res.desc,
IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY,
crashk_res.start, crashk_res.end, kbuf,
locate_mem_hole_callback);
else
ret = walk_system_ram_res(0, -1, kbuf,
locate_mem_hole_callback);
ret = arch_kexec_walk_mem(kbuf, locate_mem_hole_callback);
if (ret != 1) {
/* A suitable memory range could not be found for buffer */
return -EADDRNOTAVAIL;
......
......@@ -20,22 +20,6 @@ struct kexec_sha_region {
unsigned long len;
};
/*
* Keeps track of buffer parameters as provided by caller for requesting
* memory placement of buffer.
*/
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; /* allocate from top of memory hole */
};
void kimage_file_post_load_cleanup(struct kimage *image);
#else /* CONFIG_KEXEC_FILE */
static inline void kimage_file_post_load_cleanup(struct kimage *image) { }
......
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