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Date: Fri, 27 Jul 2018 14:25:14 +0900
From: AKASHI Takahiro <takahiro.akashi@...aro.org>
To: Dave Young <dyoung@...hat.com>
Cc: catalin.marinas@....com, will.deacon@....com, dhowells@...hat.com,
vgoyal@...hat.com, herbert@...dor.apana.org.au,
davem@...emloft.net, bhe@...hat.com, arnd@...db.de,
schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
ard.biesheuvel@...aro.org, james.morse@....com,
bhsharma@...hat.com, kexec@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH v12 04/16] powerpc, kexec_file: factor out memblock-based
arch_kexec_walk_mem()
On Wed, Jul 25, 2018 at 08:31:29PM +0800, Dave Young wrote:
> 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@...aro.org>
> > Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
> > Cc: Dave Young <dyoung@...hat.com>
> > Cc: Vivek Goyal <vgoyal@...hat.com>
> > Cc: Baoquan He <bhe@...hat.com>
> > Acked-by: James Morse <james.morse@....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()
OK.
-Takahiro AKASHI
> Other than this,
>
> Acked-by: Dave Young <dyoung@...hat.com>
>
> >
> > return ret == 1 ? 0 : -EADDRNOTAVAIL;
> > }
> > --
> > 2.18.0
> >
>
> Thanks
> Dave
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