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SubjectRe: [PATCH v12 04/16] powerpc, kexec_file: factor out memblock-based arch_kexec_walk_mem()
On 07/24/18 at 03:57pm, AKASHI Takahiro wrote:
> 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().
>
> kexec_walk_memblock() will not work for kdump 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>
> Cc: 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>
> ---
> arch/powerpc/kernel/machine_kexec_file_64.c | 54 -------------------
> include/linux/kexec.h | 2 -
> kernel/kexec_file.c | 58 ++++++++++++++++++++-
> 3 files changed, 56 insertions(+), 58 deletions(-)
>
> diff --git a/arch/powerpc/kernel/machine_kexec_file_64.c b/arch/powerpc/kernel/machine_kexec_file_64.c
> index 0bd23dc789a4..5357b09902c5 100644
> --- a/arch/powerpc/kernel/machine_kexec_file_64.c
> +++ b/arch/powerpc/kernel/machine_kexec_file_64.c
> @@ -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.
> diff --git a/include/linux/kexec.h b/include/linux/kexec.h
> index 49ab758f4d91..c196bfd11bee 100644
> --- a/include/linux/kexec.h
> +++ b/include/linux/kexec.h
> @@ -184,8 +184,6 @@ 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);
>
> diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
> index bf39df5e5bb9..2f0691b0f8ad 100644
> --- a/kernel/kexec_file.c
> +++ b/kernel/kexec_file.c
> @@ -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>
> @@ -501,6 +502,55 @@ static int locate_mem_hole_callback(struct resource *res, void *arg)
> return locate_mem_hole_bottom_up(start, end, kbuf);
> }
>
> +#if defined(CONFIG_HAVE_MEMBLOCK) && !defined(CONFIG_ARCH_DISCARD_MEMBLOCK)
> +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;
> +}
> +#else
> +static int kexec_walk_memblock(struct kexec_buf *kbuf,
> + int (*func)(struct resource *, void *))
> +{
> + return 0;
> +}
> +#endif
> +
> /**
> * arch_kexec_walk_mem - call func(data) on free memory regions
> * @kbuf: Context info for the search. Also passed to @func.
> @@ -510,7 +560,7 @@ 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,
> +static int arch_kexec_walk_mem(struct kexec_buf *kbuf,
> int (*func)(struct resource *, void *))
> {
> if (kbuf->image->type == KEXEC_TYPE_CRASH)
> @@ -538,7 +588,11 @@ int kexec_locate_mem_hole(struct kexec_buf *kbuf)
> if (kbuf->mem)
> return 0;
>
> - ret = arch_kexec_walk_mem(kbuf, locate_mem_hole_callback);
> + if (IS_ENABLED(CONFIG_HAVE_MEMBLOCK) &&
> + !IS_ENABLED(CONFIG_ARCH_DISCARD_MEMBLOCK))
> + ret = kexec_walk_memblock(kbuf, locate_mem_hole_callback);
> + else
> + ret = arch_kexec_walk_mem(kbuf, locate_mem_hole_callback);

AKASHI, since it is not weak function now, it would be better to rename
the function for example name it as kexec_walk_resource()

Other than this,

Acked-by: Dave Young <dyoung@redhat.com>

>
> return ret == 1 ? 0 : -EADDRNOTAVAIL;
> }
> --
> 2.18.0
>

Thanks
Dave

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