drivers/virtio/virtio_mem.c

46  * * Sub Block Mode (SBM): A Linux memory block spans 2..X subblocks (SB). The
49  *   Subblocks within a Linux memory block might either be plugged or unplugged.
170 			/* The number of subblocks per Linux memory block. */
199 			 * With 4 MiB subblocks, we manage 128 GiB of memory
229 	 * OFFLINE blocks can't change the state and no subblocks will get
512  * Mark all selected subblocks plugged.
526  * Mark all selected subblocks unplugged.
540  * Test if all selected subblocks are plugged.
557  * Test if all selected subblocks are unplugged.
781  * Try (offlining and) removing memory from Linux in case all subblocks are
792 	 * Once all subblocks of a memory block were unplugged, offline and  in virtio_mem_sbm_try_remove_unplugged_mb()
1308 	 * unplugged subblocks within such a page, we have to process in  in virtio_mem_online_page()
1518  * Plug selected subblocks. Updates the plugged state, but not the state
1536  * Unplug selected subblocks. Updates the plugged state, but not the state
1580  * Unplug the desired number of plugged subblocks of a offline or not-added
1586  * Note: can fail after some subblocks were unplugged.
1602 		/* Try to unplug multiple subblocks at a time */  in virtio_mem_sbm_unplug_any_sb_raw()
1621  * Unplug all plugged subblocks of an offline or not-added memory block.
1625  * Note: can fail after some subblocks were unplugged.
1661  * Try to plug the desired number of subblocks and add the memory block
1676 	 * Plug the requested number of subblocks before adding it to linux,  in virtio_mem_sbm_plug_and_add_mb()
1677 	 * so that onlining will directly online all plugged subblocks.  in virtio_mem_sbm_plug_and_add_mb()
1710  * Try to plug the desired number of subblocks of a memory block that
1715  * Note: Can fail after some subblocks were successfully plugged.
1928  * Unplug the desired number of plugged subblocks of an offline memory block.
1934  * Note: Can fail after some subblocks were successfully unplugged.
1944 	/* some subblocks might have been unplugged even on failure */  in virtio_mem_sbm_unplug_any_sb_offline()
1970  * Unplug the given plugged subblocks of an online memory block.
2013  * Unplug the desired number of plugged subblocks of an online memory block.
2019  * Note: Can fail after some subblocks were successfully unplugged. Can
2020  *       return 0 even if subblocks were busy and could not get unplugged.
2040 	/* Fallback to single subblocks. */  in virtio_mem_sbm_unplug_any_sb_online()
2066  * Unplug the desired number of plugged subblocks of a memory block that is
2074  * Note: Can fail after some subblocks were successfully unplugged. Can
2075  *       return 0 even if subblocks were busy and could not get unplugged.
2563 		/* SBM: At least two subblocks per Linux memory block. */  in virtio_mem_init_hotplug()