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authorPavel Tatashin <pasha.tatashin@soleen.com>2019-07-17 01:30:35 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2019-07-17 04:23:24 +0200
commit9f960da72b25054163cf555e622dcdc3b8ccc488 (patch)
tree48fde1d36295fed7bb3dfc9a842f88039a20c9df /drivers/dax/dax-private.h
parentmm/hotplug: make remove_memory() interface usable (diff)
downloadlinux-9f960da72b25054163cf555e622dcdc3b8ccc488.tar.xz
linux-9f960da72b25054163cf555e622dcdc3b8ccc488.zip
device-dax: "Hotremove" persistent memory that is used like normal RAM
It is now allowed to use persistent memory like a regular RAM, but currently there is no way to remove this memory until machine is rebooted. This work expands the functionality to also allows hotremoving previously hotplugged persistent memory, and recover the device for use for other purposes. To hotremove persistent memory, the management software must first offline all memory blocks of dax region, and than unbind it from device-dax/kmem driver. So, operations should look like this: echo offline > /sys/devices/system/memory/memoryN/state ... echo dax0.0 > /sys/bus/dax/drivers/kmem/unbind Note: if unbind is done without offlining memory beforehand, it won't be possible to do dax0.0 hotremove, and dax's memory is going to be part of System RAM until reboot. Link: http://lkml.kernel.org/r/20190517215438.6487-4-pasha.tatashin@soleen.com Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com> Reviewed-by: David Hildenbrand <david@redhat.com> Cc: James Morris <jmorris@namei.org> Cc: Sasha Levin <sashal@kernel.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Keith Busch <keith.busch@intel.com> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Ross Zwisler <zwisler@kernel.org> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: Huang Ying <ying.huang@intel.com> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Borislav Petkov <bp@suse.de> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Yaowei Bai <baiyaowei@cmss.chinamobile.com> Cc: Takashi Iwai <tiwai@suse.de> Cc: Jérôme Glisse <jglisse@redhat.com> Cc: Dave Hansen <dave.hansen@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/dax/dax-private.h')
-rw-r--r--drivers/dax/dax-private.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h
index c915889d1769..6ccca3b890d6 100644
--- a/drivers/dax/dax-private.h
+++ b/drivers/dax/dax-private.h
@@ -43,6 +43,7 @@ struct dax_region {
* @target_node: effective numa node if dev_dax memory range is onlined
* @dev - device core
* @pgmap - pgmap for memmap setup / lifetime (driver owned)
+ * @dax_mem_res: physical address range of hotadded DAX memory
*/
struct dev_dax {
struct dax_region *region;
@@ -50,6 +51,7 @@ struct dev_dax {
int target_node;
struct device dev;
struct dev_pagemap pgmap;
+ struct resource *dax_kmem_res;
};
static inline struct dev_dax *to_dev_dax(struct device *dev)