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Message-ID: <bd1550b1-22df-76f3-e2a9-f7767f479e1f@huawei.com>
Date: Fri, 14 Oct 2016 18:53:51 +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>,
<n-horiguchi@...jp.nec.com>, linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH] base memory: introduce CONFIG_MEMORY_DEVICE
+ mm mail list
On 2016/10/10 19:26, Yisheng Xie wrote:
> 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;
>
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