1 // SPDX-License-Identifier: GPL-2.0
4  * Copyright (C) 2016-2017 Christoph Hellwig.
14 	affd->nr_sets = 1;  in default_calc_sets()
15 	affd->set_size[0] = affvecs;  in default_calc_sets()
19  * irq_create_affinity_masks - Create affinity masks for multiqueue spreading
29 	struct irq_affinity_desc *masks = NULL;  in irq_create_affinity_masks()  local
37 	if (nvecs > affd->pre_vectors + affd->post_vectors)  in irq_create_affinity_masks()
38 		affvecs = nvecs - affd->pre_vectors - affd->post_vectors;  in irq_create_affinity_masks()
46 	if (!affd->calc_sets)  in irq_create_affinity_masks()
47 		affd->calc_sets = default_calc_sets;  in irq_create_affinity_masks()
50 	affd->calc_sets(affd, affvecs);  in irq_create_affinity_masks()
52 	if (WARN_ON_ONCE(affd->nr_sets > IRQ_AFFINITY_MAX_SETS))  in irq_create_affinity_masks()
59 	masks = kcalloc(nvecs, sizeof(*masks), GFP_KERNEL);  in irq_create_affinity_masks()
60 	if (!masks)  in irq_create_affinity_masks()
63 	/* Fill out vectors at the beginning that don't need affinity */  in irq_create_affinity_masks()
64 	for (curvec = 0; curvec < affd->pre_vectors; curvec++)  in irq_create_affinity_masks()
65 		cpumask_copy(&masks[curvec].mask, irq_default_affinity);  in irq_create_affinity_masks()
68 	 * Spread on present CPUs starting from affd->pre_vectors. If we  in irq_create_affinity_masks()
71 	for (i = 0, usedvecs = 0; i < affd->nr_sets; i++) {  in irq_create_affinity_masks()
72 		unsigned int this_vecs = affd->set_size[i];  in irq_create_affinity_masks()
77 			kfree(masks);  in irq_create_affinity_masks()
82 			cpumask_copy(&masks[curvec + j].mask, &result[j]);  in irq_create_affinity_masks()
89 	/* Fill out vectors at the end that don't need affinity */  in irq_create_affinity_masks()
91 		curvec = affd->pre_vectors + affvecs;  in irq_create_affinity_masks()
93 		curvec = affd->pre_vectors + usedvecs;  in irq_create_affinity_masks()
95 		cpumask_copy(&masks[curvec].mask, irq_default_affinity);  in irq_create_affinity_masks()
98 	for (i = affd->pre_vectors; i < nvecs - affd->post_vectors; i++)  in irq_create_affinity_masks()
99 		masks[i].is_managed = 1;  in irq_create_affinity_masks()
101 	return masks;  in irq_create_affinity_masks()
105  * irq_calc_affinity_vectors - Calculate the optimal number of vectors
113 	unsigned int resv = affd->pre_vectors + affd->post_vectors;  in irq_calc_affinity_vectors()
119 	if (affd->calc_sets) {  in irq_calc_affinity_vectors()
120 		set_vecs = maxvec - resv;  in irq_calc_affinity_vectors()
127 	return resv + min(set_vecs, maxvec - resv);  in irq_calc_affinity_vectors()