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Date: Mon, 10 Oct 2016 19:26:40 +0800
From: Yisheng Xie <xieyisheng1@...wei.com>
To: <akpm@...ux-foundation.org>, <andrew@...n.ch>,
<daniel.kiper@...cle.com>, <srinivas.kandagatla@...aro.org>,
<gregkh@...uxfoundation.org>, <vkuznets@...hat.com>
CC: <linux-kernel@...r.kernel.org>, <ak@...ux.intel.com>,
<guohanjun@...wei.com>, <qiuxishi@...wei.com>
Subject: [PATCH] base memory: introduce CONFIG_MEMORY_DEVICE
MEMORY_FAILURE do not depend on SPARSEMEM_MANUAL,
nor MEMORY_HOTPLUG_SPARSE. However, when I tried to use sysfs:
/sys/devices/system/memory/soft_offline_page
/sys/devices/system/memory/hard_offline_page
to test memory failure function with FLATMEM_MANUAL && MEMORY_FAILURE
enabled on arch like i386, it failed for no such sysfs.
To make sysfs soft_offline_page usable once MEMORY_FAILURE is enabled,
this patch introduces CONFIG_MEMORY_DEVICE, and selects it when
MEMORY_FAILURE or MEMORY_HOTPLUG_SPARSE is enabled.
Signed-off-by: Yisheng Xie <xieyisheng1@...wei.com>
---
drivers/base/Kconfig | 3 +++
drivers/base/Makefile | 2 +-
drivers/base/memory.c | 32 ++++++++++++++++++++++++++++++--
include/linux/memory.h | 4 ++++
4 files changed, 38 insertions(+), 3 deletions(-)
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index fdf44ca..b4eac4e 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -271,6 +271,9 @@ config DMA_CMA
For more information see <include/linux/dma-contiguous.h>.
If unsure, say "n".
+config MEMORY_DEVICE
+ def_bool MEMORY_HOTPLUG_SPARSE || MEMORY_FAILURE
+
if DMA_CMA
comment "Default contiguous memory area size:"
diff --git a/drivers/base/Makefile b/drivers/base/Makefile
index 2609ba2..aafe34b 100644
--- a/drivers/base/Makefile
+++ b/drivers/base/Makefile
@@ -13,7 +13,7 @@ obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o
obj-$(CONFIG_ISA_BUS_API) += isa.o
obj-$(CONFIG_FW_LOADER) += firmware_class.o
obj-$(CONFIG_NUMA) += node.o
-obj-$(CONFIG_MEMORY_HOTPLUG_SPARSE) += memory.o
+obj-$(CONFIG_MEMORY_DEVICE) += memory.o
ifeq ($(CONFIG_SYSFS),y)
obj-$(CONFIG_MODULES) += module.o
endif
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index dc75de9..fb00965 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -25,10 +25,11 @@
#include <linux/atomic.h>
#include <asm/uaccess.h>
-static DEFINE_MUTEX(mem_sysfs_mutex);
-
#define MEMORY_CLASS_NAME "memory"
+#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
+static DEFINE_MUTEX(mem_sysfs_mutex);
+
#define to_memory_block(dev) container_of(dev, struct memory_block, dev)
static int sections_per_block;
@@ -381,6 +382,7 @@ static ssize_t show_phys_device(struct device *dev,
struct memory_block *mem = to_memory_block(dev);
return sprintf(buf, "%d\n", mem->phys_device);
}
+#endif
#ifdef CONFIG_MEMORY_HOTREMOVE
static ssize_t show_valid_zones(struct device *dev,
@@ -427,6 +429,7 @@ static ssize_t show_valid_zones(struct device *dev,
static DEVICE_ATTR(valid_zones, 0444, show_valid_zones, NULL);
#endif
+#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
static DEVICE_ATTR(phys_index, 0444, show_mem_start_phys_index, NULL);
static DEVICE_ATTR(state, 0644, show_mem_state, store_mem_state);
static DEVICE_ATTR(phys_device, 0444, show_phys_device, NULL);
@@ -474,6 +477,7 @@ store_auto_online_blocks(struct device *dev, struct device_attribute *attr,
static DEVICE_ATTR(auto_online_blocks, 0644, show_auto_online_blocks,
store_auto_online_blocks);
+#endif
/*
* Some architectures will have custom drivers to do this, and
@@ -557,6 +561,7 @@ static DEVICE_ATTR(soft_offline_page, S_IWUSR, NULL, store_soft_offline_page);
static DEVICE_ATTR(hard_offline_page, S_IWUSR, NULL, store_hard_offline_page);
#endif
+#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
/*
* Note that phys_device is optional. It is here to allow for
* differentiation between which *physical* devices each
@@ -723,6 +728,7 @@ out:
mutex_unlock(&mem_sysfs_mutex);
return ret;
}
+#endif
#ifdef CONFIG_MEMORY_HOTREMOVE
static void
@@ -766,11 +772,13 @@ int unregister_memory_section(struct mem_section *section)
}
#endif /* CONFIG_MEMORY_HOTREMOVE */
+#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
/* return true if the memory block is offlined, otherwise, return false */
bool is_memblock_offlined(struct memory_block *mem)
{
return mem->state == MEM_OFFLINE;
}
+#endif
static struct attribute *memory_root_attrs[] = {
#ifdef CONFIG_ARCH_MEMORY_PROBE
@@ -782,8 +790,10 @@ static struct attribute *memory_root_attrs[] = {
&dev_attr_hard_offline_page.attr,
#endif
+#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
&dev_attr_block_size_bytes.attr,
&dev_attr_auto_online_blocks.attr,
+#endif
NULL
};
@@ -799,6 +809,7 @@ static const struct attribute_group *memory_root_attr_groups[] = {
/*
* Initialize the sysfs support for memory devices...
*/
+#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
int __init memory_dev_init(void)
{
unsigned int i;
@@ -830,3 +841,20 @@ out:
printk(KERN_ERR "%s() failed: %d\n", __func__, ret);
return ret;
}
+#else
+static struct bus_type memory_subsys = {
+ .name = MEMORY_CLASS_NAME,
+ .dev_name = MEMORY_CLASS_NAME,
+};
+
+int __init memory_dev_init(void)
+{
+ int ret = 0;
+
+ ret = subsys_system_register(&memory_subsys, memory_root_attr_groups);
+
+ if (ret)
+ pr_err("%s() failed: %d\n", __func__, ret);
+ return ret;
+}
+#endif
diff --git a/include/linux/memory.h b/include/linux/memory.h
index 093607f..9fe1089 100644
--- a/include/linux/memory.h
+++ b/include/linux/memory.h
@@ -77,10 +77,14 @@ struct mem_section;
#define IPC_CALLBACK_PRI 10
#ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
+#ifdef CONFIG_MEMORY_DEVICE
+extern int memory_dev_init(void);
+#else
static inline int memory_dev_init(void)
{
return 0;
}
+#endif
static inline int register_memory_notifier(struct notifier_block *nb)
{
return 0;
--
1.7.12.4
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