drivers/virtio/virtio_mem.c

44  * * Sub Block Mode (SBM): A Linux memory block spans 2..X subblocks (SB). The
47  *   Subblocks within a Linux memory block might either be plugged or unplugged.
168 			/* The number of subblocks per Linux memory block. */
197 			 * With 4 MiB subblocks, we manage 128 GiB of memory
227 	 * OFFLINE blocks can't change the state and no subblocks will get
507  * Mark all selected subblocks plugged.
521  * Mark all selected subblocks unplugged.
535  * Test if all selected subblocks are plugged.
552  * Test if all selected subblocks are unplugged.
776  * Try (offlining and) removing memory from Linux in case all subblocks are
787 	 * Once all subblocks of a memory block were unplugged, offline and  in virtio_mem_sbm_try_remove_unplugged_mb()
1285 	 * unplugged subblocks within such a page, we have to process in  in virtio_mem_online_page()
1495  * Plug selected subblocks. Updates the plugged state, but not the state
1513  * Unplug selected subblocks. Updates the plugged state, but not the state
1557  * Unplug the desired number of plugged subblocks of a offline or not-added
1563  * Note: can fail after some subblocks were unplugged.
1579 		/* Try to unplug multiple subblocks at a time */  in virtio_mem_sbm_unplug_any_sb_raw()
1598  * Unplug all plugged subblocks of an offline or not-added memory block.
1602  * Note: can fail after some subblocks were unplugged.
1638  * Try to plug the desired number of subblocks and add the memory block
1653 	 * Plug the requested number of subblocks before adding it to linux,  in virtio_mem_sbm_plug_and_add_mb()
1654 	 * so that onlining will directly online all plugged subblocks.  in virtio_mem_sbm_plug_and_add_mb()
1687  * Try to plug the desired number of subblocks of a memory block that
1692  * Note: Can fail after some subblocks were successfully plugged.
1905  * Unplug the desired number of plugged subblocks of an offline memory block.
1911  * Note: Can fail after some subblocks were successfully unplugged.
1921 	/* some subblocks might have been unplugged even on failure */  in virtio_mem_sbm_unplug_any_sb_offline()
1947  * Unplug the given plugged subblocks of an online memory block.
1990  * Unplug the desired number of plugged subblocks of an online memory block.
1996  * Note: Can fail after some subblocks were successfully unplugged. Can
1997  *       return 0 even if subblocks were busy and could not get unplugged.
2017 	/* Fallback to single subblocks. */  in virtio_mem_sbm_unplug_any_sb_online()
2043  * Unplug the desired number of plugged subblocks of a memory block that is
2051  * Note: Can fail after some subblocks were successfully unplugged. Can
2052  *       return 0 even if subblocks were busy and could not get unplugged.
2540 		/* SBM: At least two subblocks per Linux memory block. */  in virtio_mem_init_hotplug()