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powerpc, kexec_file: factor out memblock-based arch_kexec_walk_mem() 

Memblock list is another source for usable system memory layout.
So move powerpc's arch_kexec_walk_mem() to common code so that other
memblock-based architectures, particularly arm64, can also utilise it.
A moved function is now renamed to kexec_walk_memblock() and integrated
into kexec_locate_mem_hole(), which will now be usable for all
architectures with no need for overriding arch_kexec_walk_mem().

With this change, arch_kexec_walk_mem() need no longer be a weak function,
and was now renamed to kexec_walk_resources().

Since powerpc doesn't support kdump in its kexec_file_load(), the current
kexec_walk_memblock() won't work for kdump either in this form, this will
be fixed in the next patch.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Acked-by: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
AKASHI Takahiro 2018-11-15 14:52:43 +09:00 committed by Will Deacon
parent b6664ba42f
commit 735c2f90e3
3 changed files with 57 additions and 60 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
arch/powerpc/kernel/machine_kexec_file_64.c
View File

@ -24,7 +24,6 @@
#include <linux/slab.h>
#include <linux/kexec.h>
#include <linux/memblock.h>
#include <linux/of_fdt.h>
#include <linux/libfdt.h>
#include <asm/ima.h>
@ -46,59 +45,6 @@ int arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
return kexec_image_probe_default(image, buf, buf_len);
}
/**
* arch_kexec_walk_mem - call func(data) for each unreserved memory block
* @kbuf: Context info for the search. Also passed to @func.
* @func: Function to call for each memory block.
*
* This function is used by kexec_add_buffer and kexec_locate_mem_hole
* to find unreserved memory to load kexec segments into.
*
* 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 arch_kexec_walk_mem(struct kexec_buf *kbuf,
int (*func)(struct resource *, void *))
{
int ret = 0;
u64 i;
phys_addr_t mstart, mend;
struct resource res = { };
if (kbuf->top_down) {
for_each_free_mem_range_reverse(i, NUMA_NO_NODE, 0,
&mstart, &mend, NULL) {
/*
* In memblock, end points to the first byte after the
* range while in kexec, end points to the last byte
* in the range.
*/
res.start = mstart;
res.end = mend - 1;
ret = func(&res, kbuf);
if (ret)
break;
}
} else {
for_each_free_mem_range(i, NUMA_NO_NODE, 0, &mstart, &mend,
NULL) {
/*
* In memblock, end points to the first byte after the
* range while in kexec, end points to the last byte
* in the range.
*/
res.start = mstart;
res.end = mend - 1;
ret = func(&res, kbuf);
if (ret)
break;
}
}
return ret;
}
/**
* setup_purgatory - initialize the purgatory's global variables
* @image: kexec image.

2
include/linux/kexec.h
View File

@ -192,8 +192,6 @@ int __weak arch_kexec_apply_relocations(struct purgatory_info *pi,
const Elf_Shdr *relsec,
const Elf_Shdr *symtab);
int __weak arch_kexec_walk_mem(struct kexec_buf *kbuf,
int (*func)(struct resource *, void *));
extern int kexec_add_buffer(struct kexec_buf *kbuf);
int kexec_locate_mem_hole(struct kexec_buf *kbuf);

61
kernel/kexec_file.c
View File

@ -16,6 +16,7 @@
#include <linux/file.h>
#include <linux/slab.h>
#include <linux/kexec.h>
#include <linux/memblock.h>
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/fs.h>
@ -499,8 +500,57 @@ static int locate_mem_hole_callback(struct resource *res, void *arg)
return locate_mem_hole_bottom_up(start, end, kbuf);
}
#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
static int kexec_walk_memblock(struct kexec_buf *kbuf,
int (*func)(struct resource *, void *))
{
return 0;
}
#else
static int kexec_walk_memblock(struct kexec_buf *kbuf,
int (*func)(struct resource *, void *))
{
int ret = 0;
u64 i;
phys_addr_t mstart, mend;
struct resource res = { };
if (kbuf->top_down) {
for_each_free_mem_range_reverse(i, NUMA_NO_NODE, 0,
&mstart, &mend, NULL) {
/*
* In memblock, end points to the first byte after the
* range while in kexec, end points to the last byte
* in the range.
*/
res.start = mstart;
res.end = mend - 1;
ret = func(&res, kbuf);
if (ret)
break;
}
} else {
for_each_free_mem_range(i, NUMA_NO_NODE, 0, &mstart, &mend,
NULL) {
/*
* In memblock, end points to the first byte after the
* range while in kexec, end points to the last byte
* in the range.
*/
res.start = mstart;
res.end = mend - 1;
ret = func(&res, kbuf);
if (ret)
break;
}
}
return ret;
}
#endif
/**
* arch_kexec_walk_mem - call func(data) on free memory regions
* kexec_walk_resources - 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.
*
@ -508,8 +558,8 @@ static int locate_mem_hole_callback(struct resource *res, void *arg)
* 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)(struct resource *, void *))
static int kexec_walk_resources(struct kexec_buf *kbuf,
int (*func)(struct resource *, void *))
{
if (kbuf->image->type == KEXEC_TYPE_CRASH)
return walk_iomem_res_desc(crashk_res.desc,
@ -536,7 +586,10 @@ int kexec_locate_mem_hole(struct kexec_buf *kbuf)
if (kbuf->mem != KEXEC_BUF_MEM_UNKNOWN)
return 0;
ret = arch_kexec_walk_mem(kbuf, locate_mem_hole_callback);
if (IS_ENABLED(CONFIG_ARCH_DISCARD_MEMBLOCK))
ret = kexec_walk_resources(kbuf, locate_mem_hole_callback);
else
ret = kexec_walk_memblock(kbuf, locate_mem_hole_callback);
return ret == 1 ? 0 : -EADDRNOTAVAIL;
}