From: AKASHI Takahiro <takahiro.akashi@linaro.org>
To: catalin.marinas@arm.com, will.deacon@arm.com,
bauerman@linux.vnet.ibm.com, dhowells@redhat.com,
vgoyal@redhat.com, herbert@gondor.apana.org.au,
davem@davemloft.net, akpm@linux-foundation.org,
mpe@ellerman.id.au, dyoung@redhat.com, bhe@redhat.com,
arnd@arndb.de, ard.biesheuvel@linaro.org, julien.thierry@arm.com
Cc: kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
AKASHI Takahiro <takahiro.akashi@linaro.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: [PATCH v7 01/11] resource: add walk_system_ram_res_rev()
Date: Mon, 4 Dec 2017 11:57:51 +0900 [thread overview]
Message-ID: <20171204025801.12161-2-takahiro.akashi@linaro.org> (raw)
In-Reply-To: <20171204025801.12161-1-takahiro.akashi@linaro.org>
This function, being a variant of walk_system_ram_res() introduced in
commit 8c86e70acead ("resource: provide new functions to walk through
resources"), walks through a list of all the resources of System RAM
in reversed order, i.e., from higher to lower.
It will be used in kexec_file implementation on arm64.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
---
include/linux/ioport.h | 3 +++
kernel/resource.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 60 insertions(+)
diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 93b4183cf53d..322ac1f58b36 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -277,6 +277,9 @@ extern int
walk_system_ram_res(u64 start, u64 end, void *arg,
int (*func)(struct resource *, void *));
extern int
+walk_system_ram_res_rev(u64 start, u64 end, void *arg,
+ int (*func)(struct resource *, void *));
+extern int
walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start, u64 end,
void *arg, int (*func)(struct resource *, void *));
diff --git a/kernel/resource.c b/kernel/resource.c
index 54ba6de3757c..aefc1d5d6b75 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -23,6 +23,8 @@
#include <linux/pfn.h>
#include <linux/mm.h>
#include <linux/resource_ext.h>
+#include <linux/string.h>
+#include <linux/vmalloc.h>
#include <asm/io.h>
@@ -486,6 +488,61 @@ int walk_mem_res(u64 start, u64 end, void *arg,
arg, func);
}
+int walk_system_ram_res_rev(u64 start, u64 end, void *arg,
+ int (*func)(struct resource *, void *))
+{
+ struct resource res, *rams;
+ int rams_size = 16, i;
+ int ret = -1;
+
+ /* create a list */
+ rams = vmalloc(sizeof(struct resource) * rams_size);
+ if (!rams)
+ return ret;
+
+ res.start = start;
+ res.end = end;
+ res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+ i = 0;
+ while ((res.start < res.end) &&
+ (!find_next_iomem_res(&res, IORES_DESC_NONE, true))) {
+ if (i >= rams_size) {
+ /* re-alloc */
+ struct resource *rams_new;
+ int rams_new_size;
+
+ rams_new_size = rams_size + 16;
+ rams_new = vmalloc(sizeof(struct resource)
+ * rams_new_size);
+ if (!rams_new)
+ goto out;
+
+ memcpy(rams_new, rams,
+ sizeof(struct resource) * rams_size);
+ vfree(rams);
+ rams = rams_new;
+ rams_size = rams_new_size;
+ }
+
+ rams[i].start = res.start;
+ rams[i++].end = res.end;
+
+ res.start = res.end + 1;
+ res.end = end;
+ }
+
+ /* go reverse */
+ for (i--; i >= 0; i--) {
+ ret = (*func)(&rams[i], arg);
+ if (ret)
+ break;
+ }
+
+out:
+ vfree(rams);
+ return ret;
+}
+
#if !defined(CONFIG_ARCH_HAS_WALK_MEMORY)
/*
--
2.14.1
next prev parent reply other threads:[~2017-12-04 2:54 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-04 2:57 [PATCH v7 00/11] arm64: kexec: add kexec_file_load() support AKASHI Takahiro
2017-12-04 2:57 ` AKASHI Takahiro [this message]
2017-12-04 2:57 ` [PATCH v7 02/11] kexec_file: factor out arch_kexec_kernel_*() from x86, powerpc AKASHI Takahiro
2017-12-04 2:57 ` [PATCH v7 03/11] kexec_file: factor out crashdump elf header function from x86 AKASHI Takahiro
2018-02-07 18:37 ` James Morse
2018-02-09 12:23 ` AKASHI Takahiro
2017-12-04 2:57 ` [PATCH v7 04/11] asm-generic: add kexec_file_load system call to unistd.h AKASHI Takahiro
2017-12-04 2:57 ` [PATCH v7 05/11] arm64: kexec_file: create purgatory AKASHI Takahiro
2018-02-07 18:37 ` James Morse
2018-02-09 12:40 ` AKASHI Takahiro
2017-12-04 2:57 ` [PATCH v7 06/11] arm64: kexec_file: load initrd, device-tree and purgatory segments AKASHI Takahiro
2017-12-04 2:57 ` [PATCH v7 07/11] arm64: kexec_file: set up for crash dump adding elf core header AKASHI Takahiro
2017-12-04 2:57 ` [PATCH v7 08/11] arm64: kexec_file: enable KEXEC_FILE config AKASHI Takahiro
2017-12-04 2:57 ` [PATCH v7 09/11] arm64: kexec_file: add Image format support AKASHI Takahiro
2017-12-04 2:58 ` [PATCH v7 10/11] include: pe.h: remove message[] from mz header definition AKASHI Takahiro
2017-12-04 2:58 ` [PATCH v7 11/11] arm64: kexec_file: enable KEXEC_VERIFY_SIG for Image AKASHI Takahiro
2018-02-07 18:37 ` [PATCH v7 00/11] arm64: kexec: add kexec_file_load() support James Morse
2018-02-09 11:49 ` AKASHI Takahiro
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=20171204025801.12161-2-takahiro.akashi@linaro.org \
--to=takahiro.akashi@linaro.org \
--cc=akpm@linux-foundation.org \
--cc=ard.biesheuvel@linaro.org \
--cc=arnd@arndb.de \
--cc=bauerman@linux.vnet.ibm.com \
--cc=bhe@redhat.com \
--cc=catalin.marinas@arm.com \
--cc=davem@davemloft.net \
--cc=dhowells@redhat.com \
--cc=dyoung@redhat.com \
--cc=herbert@gondor.apana.org.au \
--cc=julien.thierry@arm.com \
--cc=kexec@lists.infradead.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mpe@ellerman.id.au \
--cc=torvalds@linux-foundation.org \
--cc=vgoyal@redhat.com \
--cc=will.deacon@arm.com \
/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).