Lines Matching +full:first +full:- +full:generation

1 /* SPDX-License-Identifier: GPL-2.0-only */
3  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
6  *  -Refactored get_new_mmu_context( ) to only handle live-mm.
7  *   retiring-mm handled in other hooks
10  *  -Major rewrite of Core ASID allocation routine get_new_mmu_context
21 #include <asm-generic/mm_hooks.h>
25  * MMU tags TLBs with an 8-bit ASID, avoiding need to flush the TLB on
26  * context-switch.
32  * Each task is assigned unique ASID, with a simple round-robin allocator
33  * tracked in @asid_cpu. When 8-bit value rolls over,a new cycle is started
38  * The 32 bit @asid_cpu (and mm->asid) have 8 bits MMU PID and rest 24 bits
39  * serve as cycle/generation indicator and natural 32 bit unsigned math
40  * automagically increments the generation when lower 8 bits rollover.
49 #define asid_mm(mm, cpu)	mm->context.asid[cpu]
67 	 * Move to new ASID if it was not from current alloc-cycle/generation.  in get_new_mmu_context()
68 	 * This is done by ensuring that the generation bits in both mm->ASID  in get_new_mmu_context()
72 	 * 	 generation, e.g. local_flush_tlb_mm() for forking  parent,  in get_new_mmu_context()
73 	 * 	 first need to destroy the context, setting it to invalid  in get_new_mmu_context()
87 		 * "generation" to distinguish from no context  in get_new_mmu_context()
139 	 * for the switched-out task, unlike some other arches.  in switch_mm()
141 	 * it to CPUs where a task once ran-on, could cause stale TLB entry  in switch_mm()
142 	 * re-use, specially for a multi-threaded task.  in switch_mm()
144 	 *      For a non-aggregating mm_cpumask, IPI not sent C1, and if T1  in switch_mm()
145 	 *      were to re-migrate to C1, it could access the unmapped region  in switch_mm()
150 	mmu_setup_pgd(next, next->pgd);  in switch_mm()
156  * activate_mm defaults (in asm-generic) to switch_mm and is called at the
164 /* it seemed that deactivate_mm( ) is a reasonable place to do book-keeping
165  * for retiring-mm. However destroy_context( ) still needs to do that because
168  * there is a good chance that task gets sched-out/in, making it's ASID valid
172 #include <asm-generic/mmu_context.h>