1 // SPDX-License-Identifier: GPL-2.0
4  * Hyper-V stub IOMMU driver.
12 #include <linux/interrupt.h>
29  * According 82093AA IO-APIC spec , IO APIC has a 24-entry Interrupt
30  * Redirection Table. Hyper-V exposes one single IO-APIC and so define
41 	struct irq_data *parent = data->parent_data;  in hyperv_ir_set_affinity()
46 	/* Return error If new irq affinity is out of ioapic_max_cpumask. */  in hyperv_ir_set_affinity()
48 		return -EINVAL;  in hyperv_ir_set_affinity()
50 	ret = parent->chip->irq_set_affinity(parent, mask, force);  in hyperv_ir_set_affinity()
54 	entry = data->chip_data;  in hyperv_ir_set_affinity()
55 	entry->dest = cfg->dest_apicid;  in hyperv_ir_set_affinity()
56 	entry->vector = cfg->vector;  in hyperv_ir_set_affinity()
63 	.name			= "HYPERV-IR",
77 	if (!info || info->type != X86_IRQ_ALLOC_TYPE_IOAPIC || nr_irqs > 1)  in hyperv_irq_remapping_alloc()
78 		return -EINVAL;  in hyperv_irq_remapping_alloc()
87 		return -EINVAL;  in hyperv_irq_remapping_alloc()
90 	irq_data->chip = &hyperv_ir_chip;  in hyperv_irq_remapping_alloc()
93 	 * If there is interrupt remapping function of IOMMU, setting irq  in hyperv_irq_remapping_alloc()
94 	 * affinity only needs to change IRTE of IOMMU. But Hyper-V doesn't  in hyperv_irq_remapping_alloc()
95 	 * support interrupt remapping function, setting irq affinity of IO-APIC  in hyperv_irq_remapping_alloc()
96 	 * interrupts still needs to change IO-APIC registers. But ioapic_  in hyperv_irq_remapping_alloc()
97 	 * configure_entry() will ignore value of cfg->vector and cfg->  in hyperv_irq_remapping_alloc()
98 	 * dest_apicid when IO-APIC's parent irq domain is not the vector  in hyperv_irq_remapping_alloc()
100 	 * and dest_apicid to IO-APIC register, IO-APIC entry pointer is saved  in hyperv_irq_remapping_alloc()
102 	 * affinity() set vector and dest_apicid directly into IO-APIC entry.  in hyperv_irq_remapping_alloc()
104 	irq_data->chip_data = info->ioapic.entry;  in hyperv_irq_remapping_alloc()
107 	 * Hypver-V IO APIC irq affinity should be in the scope of  in hyperv_irq_remapping_alloc()
111 	cpumask_copy(desc->irq_common_data.affinity, &ioapic_max_cpumask);  in hyperv_irq_remapping_alloc()
126 	struct IO_APIC_route_entry *entry = irq_data->chip_data;  in hyperv_irq_remapping_activate()
128 	entry->dest = cfg->dest_apicid;  in hyperv_irq_remapping_activate()
129 	entry->vector = cfg->vector;  in hyperv_irq_remapping_activate()
147 		return -ENODEV;  in hyperv_prepare_irq_remapping()
149 	fn = irq_domain_alloc_named_id_fwnode("HYPERV-IR", 0);  in hyperv_prepare_irq_remapping()
151 		return -ENOMEM;  in hyperv_prepare_irq_remapping()
160 		return -ENOMEM;  in hyperv_prepare_irq_remapping()
164 	 * Hyper-V doesn't provide irq remapping function for  in hyperv_prepare_irq_remapping()
165 	 * IO-APIC and so IO-APIC only accepts 8-bit APIC ID.  in hyperv_prepare_irq_remapping()
167 	 * in the MADT table on Hyper-v are sorted monotonic increasingly.  in hyperv_prepare_irq_remapping()
170 	 * max cpu affinity for IOAPIC irqs. Scan cpu 0-255 and set cpu  in hyperv_prepare_irq_remapping()
173 	for (i = min_t(unsigned int, num_possible_cpus() - 1, 255); i >= 0; i--)  in hyperv_prepare_irq_remapping()
187 	if (info->type == X86_IRQ_ALLOC_TYPE_IOAPIC_GET_PARENT)  in hyperv_get_irq_domain()