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Message-Id: <20090724172200.75c9d57d.kamezawa.hiroyu@jp.fujitsu.com>
Date: Fri, 24 Jul 2009 17:22:00 +0900
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
xiyou.wangcong@...il.com,
"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
ralf@...ux-mips.org, benh@...nel.crashing.org, lethal@...ux-sh.org
Subject: [RFC][PATCH 6/6] kcore: walk_system_ram_range()
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Originally, walk_memory_resource() was introduced to traverse all memory
of "System RAM" for detecting memory hotplug/unplug range.
For doing so, flags of IORESOUCE_MEM|IORESOURCE_BUSY was used and this
was enough for memory hotplug.
But for using other purpose, /proc/kcore, this may includes some firmware
area marked as IORESOURCE_BUSY | IORESOUCE_MEM. This patch makes the check
strict to find out "System RAM".
Note: PPC keeps their own walk_memory_resouce(), which walk through
ppc's lmb informaton. Because old kclist_add() is called per lmb,
this patch makes no difference in behavior, finally.
Changelog v2->v3
- walk_memory_resource() is renamed to be walk_system_ram_range()
Changelog v2:
- new patch from v2.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
---
Index: mmotm-2.6.31-Jul16/kernel/resource.c
===================================================================
--- mmotm-2.6.31-Jul16.orig/kernel/resource.c
+++ mmotm-2.6.31-Jul16/kernel/resource.c
@@ -237,10 +237,10 @@ EXPORT_SYMBOL(release_resource);
#if !defined(CONFIG_ARCH_HAS_WALK_MEMORY)
/*
* Finds the lowest memory reosurce exists within [res->start.res->end)
- * the caller must specify res->start, res->end, res->flags.
+ * the caller must specify res->start, res->end, res->flags and "name".
* If found, returns 0, res is overwritten, if not found, returns -1.
*/
-static int find_next_system_ram(struct resource *res)
+static int find_next_system_ram(struct resource *res, char *name)
{
resource_size_t start, end;
struct resource *p;
@@ -256,6 +256,8 @@ static int find_next_system_ram(struct r
/* system ram is just marked as IORESOURCE_MEM */
if (p->flags != res->flags)
continue;
+ if (name && strcmp(p->name, name))
+ continue;
if (p->start > end) {
p = NULL;
break;
@@ -273,19 +275,26 @@ static int find_next_system_ram(struct r
res->end = p->end;
return 0;
}
-int
-walk_memory_resource(unsigned long start_pfn, unsigned long nr_pages, void *arg,
- int (*func)(unsigned long, unsigned long, void *))
+
+/*
+ * This function calls callback against all memory range of "System RAM"
+ * which are marked as IORESOURCE_MEM and IORESOUCE_BUSY.
+ * Now, this function is only for "System RAM".
+ */
+int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
+ void *arg, int (*func)(unsigned long, unsigned long, void *))
{
struct resource res;
unsigned long pfn, len;
u64 orig_end;
int ret = -1;
+
res.start = (u64) start_pfn << PAGE_SHIFT;
res.end = ((u64)(start_pfn + nr_pages) << PAGE_SHIFT) - 1;
res.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
orig_end = res.end;
- while ((res.start < res.end) && (find_next_system_ram(&res) >= 0)) {
+ while ((res.start < res.end) &&
+ (find_next_system_ram(&res, "System RAM") >= 0)) {
pfn = (unsigned long)(res.start >> PAGE_SHIFT);
len = (unsigned long)((res.end + 1 - res.start) >> PAGE_SHIFT);
ret = (*func)(pfn, len, arg);
Index: mmotm-2.6.31-Jul16/include/linux/ioport.h
===================================================================
--- mmotm-2.6.31-Jul16.orig/include/linux/ioport.h
+++ mmotm-2.6.31-Jul16/include/linux/ioport.h
@@ -190,7 +190,7 @@ extern int iomem_is_exclusive(u64 addr);
* Walk through all SYSTEM_RAM which is registered as resource.
* arg is (start_pfn, nr_pages, private_arg_pointer)
*/
-extern int walk_memory_resource(unsigned long start_pfn,
+extern int walk_system_ram_range(unsigned long start_pfn,
unsigned long nr_pages, void *arg,
int (*func)(unsigned long, unsigned long, void *));
Index: mmotm-2.6.31-Jul16/mm/memory_hotplug.c
===================================================================
--- mmotm-2.6.31-Jul16.orig/mm/memory_hotplug.c
+++ mmotm-2.6.31-Jul16/mm/memory_hotplug.c
@@ -410,7 +410,7 @@ int online_pages(unsigned long pfn, unsi
if (!populated_zone(zone))
need_zonelists_rebuild = 1;
- ret = walk_memory_resource(pfn, nr_pages, &onlined_pages,
+ ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages,
online_pages_range);
if (ret) {
printk(KERN_DEBUG "online_pages %lx at %lx failed\n",
@@ -702,7 +702,7 @@ offline_isolated_pages_cb(unsigned long
static void
offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn)
{
- walk_memory_resource(start_pfn, end_pfn - start_pfn, NULL,
+ walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL,
offline_isolated_pages_cb);
}
@@ -728,7 +728,7 @@ check_pages_isolated(unsigned long start
long offlined = 0;
int ret;
- ret = walk_memory_resource(start_pfn, end_pfn - start_pfn, &offlined,
+ ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined,
check_pages_isolated_cb);
if (ret < 0)
offlined = (long)ret;
Index: mmotm-2.6.31-Jul16/arch/powerpc/mm/mem.c
===================================================================
--- mmotm-2.6.31-Jul16.orig/arch/powerpc/mm/mem.c
+++ mmotm-2.6.31-Jul16/arch/powerpc/mm/mem.c
@@ -143,8 +143,8 @@ int arch_add_memory(int nid, u64 start,
* memory regions, find holes and callback for contiguous regions.
*/
int
-walk_memory_resource(unsigned long start_pfn, unsigned long nr_pages, void *arg,
- int (*func)(unsigned long, unsigned long, void *))
+walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
+ void *arg, int (*func)(unsigned long, unsigned long, void *))
{
struct lmb_property res;
unsigned long pfn, len;
Index: mmotm-2.6.31-Jul16/drivers/net/ehea/ehea_qmr.c
===================================================================
--- mmotm-2.6.31-Jul16.orig/drivers/net/ehea/ehea_qmr.c
+++ mmotm-2.6.31-Jul16/drivers/net/ehea/ehea_qmr.c
@@ -751,7 +751,7 @@ int ehea_create_busmap(void)
mutex_lock(&ehea_busmap_mutex);
ehea_mr_len = 0;
- ret = walk_memory_resource(0, 1ULL << MAX_PHYSMEM_BITS, NULL,
+ ret = walk_system_ram_range(0, 1ULL << MAX_PHYSMEM_BITS, NULL,
ehea_create_busmap_callback);
mutex_unlock(&ehea_busmap_mutex);
return ret;
Index: mmotm-2.6.31-Jul16/fs/proc/kcore.c
===================================================================
--- mmotm-2.6.31-Jul16.orig/fs/proc/kcore.c
+++ mmotm-2.6.31-Jul16/fs/proc/kcore.c
@@ -199,7 +199,7 @@ static int kcore_update_ram(void)
if (end_pfn < node_end_pfn(nid))
end_pfn = node_end_pfn(nid);
/* scan 0 to max_pfn */
- ret = walk_memory_resource(0, end_pfn, &head, kclist_add_private);
+ ret = walk_system_ram_range(0, end_pfn, &head, kclist_add_private);
if (ret) {
free_kclist_ents(&head);
return -ENOMEM;
--
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