1 // SPDX-License-Identifier: GPL-2.0
4  * Hyper-V stub IOMMU driver.
12 #include <linux/interrupt.h>
30  * According 82093AA IO-APIC spec , IO APIC has a 24-entry Interrupt
31  * Redirection Table. Hyper-V exposes one single IO-APIC and so define
42 	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()
60 	.name			= "HYPERV-IR",
73 	if (!info || info->type != X86_IRQ_ALLOC_TYPE_IOAPIC || nr_irqs > 1)  in hyperv_irq_remapping_alloc()
74 		return -EINVAL;  in hyperv_irq_remapping_alloc()
83 		return -EINVAL;  in hyperv_irq_remapping_alloc()
86 	irq_data->chip = &hyperv_ir_chip;  in hyperv_irq_remapping_alloc()
89 	 * Hypver-V IO APIC irq affinity should be in the scope of  in hyperv_irq_remapping_alloc()
107 	/* Claim the only I/O APIC emulated by Hyper-V */  in hyperv_irq_remapping_select()
128 		return -ENODEV;  in hyperv_prepare_irq_remapping()
131 		name = "HYPERV-ROOT-IR";  in hyperv_prepare_irq_remapping()
134 		name = "HYPERV-IR";  in hyperv_prepare_irq_remapping()
140 		return -ENOMEM;  in hyperv_prepare_irq_remapping()
148 		return -ENOMEM;  in hyperv_prepare_irq_remapping()
155 	 * Hyper-V doesn't provide irq remapping function for  in hyperv_prepare_irq_remapping()
156 	 * IO-APIC and so IO-APIC only accepts 8-bit APIC ID.  in hyperv_prepare_irq_remapping()
158 	 * in the MADT table on Hyper-v are sorted monotonic increasingly.  in hyperv_prepare_irq_remapping()
161 	 * max cpu affinity for IOAPIC irqs. Scan cpu 0-255 and set cpu  in hyperv_prepare_irq_remapping()
164 	for (i = min_t(unsigned int, num_possible_cpus() - 1, 255); i >= 0; i--)  in hyperv_prepare_irq_remapping()
195 	const struct cpumask *affinity;  in hyperv_root_ir_compose_msi_msg()  local
198 	struct hyperv_root_ir_data *data = irq_data->chip_data;  in hyperv_root_ir_compose_msi_msg()
202 	affinity = irq_data_get_effective_affinity_mask(irq_data);  in hyperv_root_ir_compose_msi_msg()
203 	cpu = cpumask_first_and(affinity, cpu_online_mask);  in hyperv_root_ir_compose_msi_msg()
205 	vector = cfg->vector;  in hyperv_root_ir_compose_msi_msg()
206 	ioapic_id = data->ioapic_id;  in hyperv_root_ir_compose_msi_msg()
208 	if (data->entry.source == HV_DEVICE_TYPE_IOAPIC  in hyperv_root_ir_compose_msi_msg()
209 	    && data->entry.ioapic_rte.as_uint64) {  in hyperv_root_ir_compose_msi_msg()
210 		entry = data->entry;  in hyperv_root_ir_compose_msi_msg()
217 		data->entry.ioapic_rte.as_uint64 = 0;  in hyperv_root_ir_compose_msi_msg()
218 		data->entry.source = 0; /* Invalid source */  in hyperv_root_ir_compose_msi_msg()
222 	status = hv_map_ioapic_interrupt(ioapic_id, data->is_level, cpu,  in hyperv_root_ir_compose_msi_msg()
230 	data->entry = entry;  in hyperv_root_ir_compose_msi_msg()
237 	msg->arch_data.vector = e.vector;  in hyperv_root_ir_compose_msi_msg()
238 	msg->arch_data.delivery_mode = e.delivery_mode;  in hyperv_root_ir_compose_msi_msg()
239 	msg->arch_addr_lo.dest_mode_logical = e.dest_mode_logical;  in hyperv_root_ir_compose_msi_msg()
240 	msg->arch_addr_lo.dmar_format = e.ir_format;  in hyperv_root_ir_compose_msi_msg()
241 	msg->arch_addr_lo.dmar_index_0_14 = e.ir_index_0_14;  in hyperv_root_ir_compose_msi_msg()
247 	struct irq_data *parent = data->parent_data;  in hyperv_root_ir_set_affinity()
251 	ret = parent->chip->irq_set_affinity(parent, mask, force);  in hyperv_root_ir_set_affinity()
261 	.name			= "HYPERV-ROOT-IR",
276 	if (!info || info->type != X86_IRQ_ALLOC_TYPE_IOAPIC || nr_irqs > 1)  in hyperv_root_irq_remapping_alloc()
277 		return -EINVAL;  in hyperv_root_irq_remapping_alloc()
286 		return -ENOMEM;  in hyperv_root_irq_remapping_alloc()
293 		return -EINVAL;  in hyperv_root_irq_remapping_alloc()
296 	data->ioapic_id = info->devid;  in hyperv_root_irq_remapping_alloc()
297 	data->is_level = info->ioapic.is_level;  in hyperv_root_irq_remapping_alloc()
299 	irq_data->chip = &hyperv_root_ir_chip;  in hyperv_root_irq_remapping_alloc()
300 	irq_data->chip_data = data;  in hyperv_root_irq_remapping_alloc()
316 		if (irq_data && irq_data->chip_data) {  in hyperv_root_irq_remapping_free()
317 			data = irq_data->chip_data;  in hyperv_root_irq_remapping_free()
318 			e = &data->entry;  in hyperv_root_irq_remapping_free()
320 			if (e->source == HV_DEVICE_TYPE_IOAPIC  in hyperv_root_irq_remapping_free()
321 			      && e->ioapic_rte.as_uint64)  in hyperv_root_irq_remapping_free()
322 				hv_unmap_ioapic_interrupt(data->ioapic_id,  in hyperv_root_irq_remapping_free()
323 							&data->entry);  in hyperv_root_irq_remapping_free()