1 // SPDX-License-Identifier: GPL-2.0-or-later
15  *   - The global context lock will not scale very well
16  *   - The maps should be dynamically allocated to allow for processors
18  *   - Implement flush_tlb_mm() by making the context stale and picking
20  *   - More aggressively clear stale map bits and maybe find some way to
21  *     also clear mm->cpu_vm_mask bits when processes are migrated
52  * not protected, just that the ASID comparison is not performed. -- Dan
57  * shared among all contexts. -- Dan
59  * The IBM 47x core supports 16-bit PIDs, thus 65535 contexts. We should
61  * -- BenH
88  * turn (sort-of pseudo-random replacement :).  This would be the
90  *  -- paulus
95  *  -- benh
102 	max = LAST_CONTEXT - FIRST_CONTEXT;  in steal_context_smp()
105 	while (max--) {  in steal_context_smp()
112 		if (mm->context.active) {  in steal_context_smp()
120 		mm->context.id = MMU_NO_CONTEXT;  in steal_context_smp()
133 			cpu = i - 1;  in steal_context_smp()
160 		mm->context.id = MMU_NO_CONTEXT;  in steal_all_contexts()
172 	nr_free_contexts = LAST_CONTEXT - FIRST_CONTEXT;  in steal_all_contexts()
194 	mm->context.id = MMU_NO_CONTEXT;  in steal_context_up()
209 		mtspr(SPRN_M_CASID, id - 1);  in set_context()
231 		next->context.active++;  in switch_mmu_context()
233 			WARN_ON(prev->context.active < 1);  in switch_mmu_context()
234 			prev->context.active--;  in switch_mmu_context()
241 	id = next->context.id;  in switch_mmu_context()
265 	nr_free_contexts--;  in switch_mmu_context()
276 	next->context.id = id;  in switch_mmu_context()
296 		abatron_pteptrs[1] = next->pgd;  in switch_mmu_context()
297 	set_context(id, next->pgd);  in switch_mmu_context()
299 	tsk->thread.pid = id;  in switch_mmu_context()
309 	mm->context.id = MMU_NO_CONTEXT;  in init_new_context()
310 	mm->context.active = 0;  in init_new_context()
311 	pte_frag_set(&mm->context, NULL);  in init_new_context()
323 	if (mm->context.id == MMU_NO_CONTEXT)  in destroy_context()
326 	WARN_ON(mm->context.active != 0);  in destroy_context()
329 	id = mm->context.id;  in destroy_context()
332 		mm->context.id = MMU_NO_CONTEXT;  in destroy_context()
386 					  "powerpc/mmu/ctx:prepare",  in mmu_context_init()
393 	       LAST_CONTEXT - FIRST_CONTEXT + 1);  in mmu_context_init()
401 	context_map[0] = (1 << FIRST_CONTEXT) - 1;  in mmu_context_init()
403 	nr_free_contexts = LAST_CONTEXT - FIRST_CONTEXT + 1;  in mmu_context_init()