From: David Woodhouse <[email protected]> This is the maximum possible set of CPUs which can be used. Use it to calculate the default affinity requested from __irq_alloc_descs() by first attempting to find the intersection with irq_default_affinity, or falling back to using just the max_affinity if the intersection would be empty.
Signed-off-by: David Woodhouse <[email protected]> --- include/linux/irqdomain.h | 3 ++- kernel/irq/ipi.c | 2 +- kernel/irq/irqdomain.c | 45 +++++++++++++++++++++++++++++++++------ 3 files changed, 42 insertions(+), 8 deletions(-) diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h index 44445d9de881..6b5576da77f0 100644 --- a/include/linux/irqdomain.h +++ b/include/linux/irqdomain.h @@ -278,7 +278,8 @@ extern void irq_set_default_host(struct irq_domain *host); extern struct irq_domain *irq_get_default_host(void); extern int irq_domain_alloc_descs(int virq, unsigned int nr_irqs, irq_hw_number_t hwirq, int node, - const struct irq_affinity_desc *affinity); + const struct irq_affinity_desc *affinity, + const struct cpumask *max_affinity); static inline struct fwnode_handle *of_node_to_fwnode(struct device_node *node) { diff --git a/kernel/irq/ipi.c b/kernel/irq/ipi.c index 43e3d1be622c..13f56210eca9 100644 --- a/kernel/irq/ipi.c +++ b/kernel/irq/ipi.c @@ -75,7 +75,7 @@ int irq_reserve_ipi(struct irq_domain *domain, } } - virq = irq_domain_alloc_descs(-1, nr_irqs, 0, NUMA_NO_NODE, NULL); + virq = irq_domain_alloc_descs(-1, nr_irqs, 0, NUMA_NO_NODE, NULL, dest); if (virq <= 0) { pr_warn("Can't reserve IPI, failed to alloc descs\n"); return -ENOMEM; diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index c93e00ca11d8..ffd41f21afca 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -660,7 +660,8 @@ unsigned int irq_create_mapping(struct irq_domain *domain, } /* Allocate a virtual interrupt number */ - virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node), NULL); + virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node), + NULL, NULL); if (virq <= 0) { pr_debug("-> virq allocation failed\n"); return 0; @@ -1011,25 +1012,57 @@ int irq_domain_translate_twocell(struct irq_domain *d, EXPORT_SYMBOL_GPL(irq_domain_translate_twocell); int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq, - int node, const struct irq_affinity_desc *affinity) + int node, const struct irq_affinity_desc *affinity, + const struct cpumask *max_affinity) { + cpumask_var_t default_affinity; unsigned int hint; + int i; + + /* Check requested per-IRQ affinities are in the possible range */ + if (affinity && max_affinity) { + for (i = 0; i < cnt; i++) + if (!cpumask_subset(&affinity[i].mask, max_affinity)) + return -EINVAL; + } + + /* + * Generate default affinity. Either the possible subset of + * irq_default_affinity if such a subset is non-empty, or fall + * back to the provided max_affinity if there is no intersection. + * And just a copy of irq_default_affinity in the + * !CONFIG_CPUMASK_OFFSTACK case. + */ + memset(&default_affinity, 0, sizeof(default_affinity)); + if ((max_affinity && + !cpumask_subset(irq_default_affinity, max_affinity))) { + if (!alloc_cpumask_var(&default_affinity, GFP_KERNEL)) + return -ENOMEM; + cpumask_and(default_affinity, max_affinity, + irq_default_affinity); + if (cpumask_empty(default_affinity)) + cpumask_copy(default_affinity, max_affinity); + } else if (cpumask_available(default_affinity)) + cpumask_copy(default_affinity, irq_default_affinity); if (virq >= 0) { virq = __irq_alloc_descs(virq, virq, cnt, node, THIS_MODULE, - affinity, NULL); + affinity, default_affinity); } else { hint = hwirq % nr_irqs; if (hint == 0) hint++; virq = __irq_alloc_descs(-1, hint, cnt, node, THIS_MODULE, - affinity, NULL); + affinity, default_affinity); if (virq <= 0 && hint > 1) { virq = __irq_alloc_descs(-1, 1, cnt, node, THIS_MODULE, - affinity, NULL); + affinity, default_affinity); } } + if (cpumask_available(default_affinity)) + free_cpumask_var(default_affinity); + return virq; } @@ -1342,7 +1375,7 @@ int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base, virq = irq_base; } else { virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node, - affinity); + affinity, NULL); if (virq < 0) { pr_debug("cannot allocate IRQ(base %d, count %d)\n", irq_base, nr_irqs); -- 2.26.2 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
