From: Dave Young <dyoung@redhat.com>
To: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org,
Eric Biederman <ebiederm@xmission.com>
Subject: Re: [PATCH v2 2/9] kexec_file: Generalize kexec_add_buffer.
Date: Thu, 16 Jun 2016 09:58:53 +0800 [thread overview]
Message-ID: <20160616015853.GA4103@dhcp-128-65.nay.redhat.com> (raw)
In-Reply-To: <3237367.XLxdnj8q4x@hactar>
On 06/15/16 at 01:21pm, Thiago Jung Bauermann wrote:
> Hello Dave,
>
> Am Mittwoch, 15 Juni 2016, 15:33:02 schrieb Dave Young:
> > > @@ -472,14 +498,16 @@ 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);
> > > + if (image->type == KEXEC_TYPE_CRASH) {
> > > + start = crashk_res.start;
> > > + end = crashk_res.end;
> > > + } else {
> > > + start = 0;
> > > + end = ULONG_MAX;
> > > + }
> >
> > For crashk_res, start and end is global, the non-crash values are
> > hard coded, thus it is not necessary to pass these two in arguments.
> >
> > Moving above to arch_kexec_walk_mem will make it cleaner.
>
> That's true. What about this version?
>
> []'s
> Thiago Jung Bauermann
> IBM Linux Technology Center
>
>
> kexec_file: Generalize kexec_add_buffer.
>
> Allow architectures to specify different memory walking functions for
> kexec_add_buffer. Intel uses iomem to track reserved memory ranges,
> but PowerPC uses the memblock subsystem.
>
> Signed-off-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
> Cc: Eric Biederman <ebiederm@xmission.com>
> Cc: Dave Young <dyoung@redhat.com>
> Cc: kexec@lists.infradead.org
> Cc: linux-kernel@vger.kernel.org
>
> diff --git a/include/linux/kexec.h b/include/linux/kexec.h
> index e8acb2b43dd9..9b02f907b40a 100644
> --- a/include/linux/kexec.h
> +++ b/include/linux/kexec.h
> @@ -315,6 +315,8 @@ int __weak arch_kexec_apply_relocations_add(const Elf_Ehdr *ehdr,
> Elf_Shdr *sechdrs, unsigned int relsec);
> int __weak arch_kexec_apply_relocations(const Elf_Ehdr *ehdr, Elf_Shdr *sechdrs,
> unsigned int relsec);
> +int __weak arch_kexec_walk_mem(unsigned int image_type, bool top_down,
> + void *data, int (*func)(u64, u64, void *));
> void arch_kexec_protect_crashkres(void);
> void arch_kexec_unprotect_crashkres(void);
>
> diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
> index b6eec7527e9f..2d066c458222 100644
> --- a/kernel/kexec_file.c
> +++ b/kernel/kexec_file.c
> @@ -428,6 +428,29 @@ 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
> + * @image_type: kimage.type
> + * @top_down: Start from the highest address?
> + * @data: Argument to pass 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(unsigned int image_type, bool top_down,
> + void *data, int (*func)(u64, u64, void *))
> +{
top_down is also not used?
Rethink about the argument name type should be better than image_type,
it is obvious in the comments and the code and simpler.
> + if (image_type == KEXEC_TYPE_CRASH)
> + return walk_iomem_res_desc(crashk_res.desc,
> + IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY,
> + crashk_res.start, crashk_res.end,
> + data, func);
> + else
> + return walk_system_ram_res(0, ULONG_MAX, data, func);
> +}
> +
> /*
> * Helper function for placing a buffer in a kexec segment. This assumes
> * that kexec_mutex is held.
> @@ -472,14 +495,8 @@ 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(image->type, top_down, kbuf,
> + locate_mem_hole_callback);
> if (ret != 1) {
> /* A suitable memory range could not be found for buffer */
> return -EADDRNOTAVAIL;
>
next prev parent reply other threads:[~2016-06-16 1:59 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-14 14:59 [PATCH v2 0/9] kexec_file_load implementation for PowerPC Thiago Jung Bauermann
2016-06-14 14:59 ` [PATCH v2 1/9] kexec_file: Remove unused members from struct kexec_buf Thiago Jung Bauermann
2016-06-14 14:59 ` [PATCH v2 2/9] kexec_file: Generalize kexec_add_buffer Thiago Jung Bauermann
2016-06-15 7:33 ` Dave Young
2016-06-15 16:21 ` Thiago Jung Bauermann
2016-06-16 1:58 ` Dave Young [this message]
2016-06-16 20:39 ` Thiago Jung Bauermann
2016-06-17 7:35 ` Dave Young
2016-06-17 20:51 ` Thiago Jung Bauermann
2016-06-20 2:26 ` Dave Young
2016-06-20 16:01 ` Thiago Jung Bauermann
2016-06-14 14:59 ` [PATCH v2 3/9] kexec_file: Factor out kexec_locate_mem_hole from kexec_add_buffer Thiago Jung Bauermann
2016-06-14 14:59 ` [PATCH v2 4/9] powerpc: Factor out relocation code from module_64.c to elf_util_64.c Thiago Jung Bauermann
2016-06-14 14:59 ` [PATCH v2 5/9] powerpc: Generalize elf64_apply_relocate_add Thiago Jung Bauermann
2016-06-14 14:59 ` [PATCH v2 6/9] powerpc: Add functions to read ELF files of any endianness Thiago Jung Bauermann
2016-06-14 14:59 ` [PATCH v2 7/9] powerpc: Implement kexec_file_load Thiago Jung Bauermann
2016-06-14 14:59 ` [PATCH v2 8/9] powerpc: Add support for loading ELF kernels with kexec_file_load Thiago Jung Bauermann
2016-06-14 14:59 ` [PATCH v2 9/9] powerpc: Add purgatory for kexec_file_load implementation Thiago Jung Bauermann
2016-06-16 5:48 ` [PATCH v2 0/9] kexec_file_load implementation for PowerPC Michael Ellerman
2016-06-16 19:55 ` Thiago Jung Bauermann
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20160616015853.GA4103@dhcp-128-65.nay.redhat.com \
--to=dyoung@redhat.com \
--cc=bauerman@linux.vnet.ibm.com \
--cc=ebiederm@xmission.com \
--cc=kexec@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).