1 // SPDX-License-Identifier: GPL-2.0-only
13 #include <linux/irqchip/arm-gic-v4.h>
25  * agnostic actually means KVM-specific - what were you thinking?).
30  * - Any guest-visible VLPI is backed by a Linux interrupt (and a
36  * - Enabling/disabling a VLPI is done by issuing mask/unmask calls.
38  * - Guest INT/CLEAR commands are implemented through
41  * - The *bizarre* stuff (mapping/unmapping an interrupt to a VLPI, or
45  *   confines the crap to a single location. And map/unmap really is
61  * interrupts which are delivered when a VLPI targeting a non-running
70  * - VMs (or rather the VM abstraction that matters to the GIC)
75  * - mask/unmask do what is expected on the doorbell interrupt.
77  * - irq_set_affinity is used to move a VPE from one redistributor to
80  * - irq_set_vcpu_affinity once again gets hijacked for the purpose of
81  *   creating a new sub-API, namely scheduling/descheduling a VPE
126 	name = kasprintf(GFP_KERNEL, "GICv4-sgi-%d", task_pid_nr(current));  in its_alloc_vcpu_sgis()
130 	vpe->fwnode = irq_domain_alloc_named_id_fwnode(name, idx);  in its_alloc_vcpu_sgis()
131 	if (!vpe->fwnode)  in its_alloc_vcpu_sgis()
137 	vpe->sgi_domain = irq_domain_create_linear(vpe->fwnode, 16,  in its_alloc_vcpu_sgis()
139 	if (!vpe->sgi_domain)  in its_alloc_vcpu_sgis()
142 	sgi_base = irq_domain_alloc_irqs(vpe->sgi_domain, 16, NUMA_NO_NODE, vpe);  in its_alloc_vcpu_sgis()
149 	if (vpe->sgi_domain)  in its_alloc_vcpu_sgis()
150 		irq_domain_remove(vpe->sgi_domain);  in its_alloc_vcpu_sgis()
151 	if (vpe->fwnode)  in its_alloc_vcpu_sgis()
152 		irq_domain_free_fwnode(vpe->fwnode);  in its_alloc_vcpu_sgis()
154 	return -ENOMEM;  in its_alloc_vcpu_sgis()
157 int its_alloc_vcpu_irqs(struct its_vm *vm)  in its_alloc_vcpu_irqs()  argument
161 	vm->fwnode = irq_domain_alloc_named_id_fwnode("GICv4-vpe",  in its_alloc_vcpu_irqs()
163 	if (!vm->fwnode)  in its_alloc_vcpu_irqs()
166 	vm->domain = irq_domain_create_hierarchy(gic_domain, 0, vm->nr_vpes,  in its_alloc_vcpu_irqs()
167 						 vm->fwnode, vpe_domain_ops,  in its_alloc_vcpu_irqs()
168 						 vm);  in its_alloc_vcpu_irqs()
169 	if (!vm->domain)  in its_alloc_vcpu_irqs()
172 	for (i = 0; i < vm->nr_vpes; i++) {  in its_alloc_vcpu_irqs()
173 		vm->vpes[i]->its_vm = vm;  in its_alloc_vcpu_irqs()
174 		vm->vpes[i]->idai = true;  in its_alloc_vcpu_irqs()
177 	vpe_base_irq = irq_domain_alloc_irqs(vm->domain, vm->nr_vpes,  in its_alloc_vcpu_irqs()
178 					     NUMA_NO_NODE, vm);  in its_alloc_vcpu_irqs()
182 	for (i = 0; i < vm->nr_vpes; i++) {  in its_alloc_vcpu_irqs()
184 		vm->vpes[i]->irq = vpe_base_irq + i;  in its_alloc_vcpu_irqs()
185 		ret = its_alloc_vcpu_sgis(vm->vpes[i], i);  in its_alloc_vcpu_irqs()
193 	if (vm->domain)  in its_alloc_vcpu_irqs()
194 		irq_domain_remove(vm->domain);  in its_alloc_vcpu_irqs()
195 	if (vm->fwnode)  in its_alloc_vcpu_irqs()
196 		irq_domain_free_fwnode(vm->fwnode);  in its_alloc_vcpu_irqs()
198 	return -ENOMEM;  in its_alloc_vcpu_irqs()
201 static void its_free_sgi_irqs(struct its_vm *vm)  in its_free_sgi_irqs()  argument
208 	for (i = 0; i < vm->nr_vpes; i++) {  in its_free_sgi_irqs()
209 		unsigned int irq = irq_find_mapping(vm->vpes[i]->sgi_domain, 0);  in its_free_sgi_irqs()
215 		irq_domain_remove(vm->vpes[i]->sgi_domain);  in its_free_sgi_irqs()
216 		irq_domain_free_fwnode(vm->vpes[i]->fwnode);  in its_free_sgi_irqs()
220 void its_free_vcpu_irqs(struct its_vm *vm)  in its_free_vcpu_irqs()  argument
222 	its_free_sgi_irqs(vm);  in its_free_vcpu_irqs()
223 	irq_domain_free_irqs(vm->vpes[0]->irq, vm->nr_vpes);  in its_free_vcpu_irqs()
224 	irq_domain_remove(vm->domain);  in its_free_vcpu_irqs()
225 	irq_domain_free_fwnode(vm->fwnode);  in its_free_vcpu_irqs()
230 	return irq_set_vcpu_affinity(vpe->irq, info);  in its_send_vpe_cmd()
235 	struct irq_desc *desc = irq_to_desc(vpe->irq);  in its_make_vpe_non_resident()
247 		while (db && irqd_irq_disabled(&desc->irq_data))  in its_make_vpe_non_resident()
248 			enable_irq(vpe->irq);  in its_make_vpe_non_resident()
253 		vpe->resident = false;  in its_make_vpe_non_resident()
255 	vpe->ready = false;  in its_make_vpe_non_resident()
273 		disable_irq_nosync(vpe->irq);  in its_make_vpe_resident()
278 		vpe->resident = true;  in its_make_vpe_resident()
294 		vpe->ready = true;  in its_commit_vpe()
309 int its_map_vlpi(int irq, struct its_vlpi_map *map)  in its_map_vlpi()  argument
314 			.map      = map,  in its_map_vlpi()
332 int its_get_vlpi(int irq, struct its_vlpi_map *map)  in its_get_vlpi()  argument
337 			.map      = map,  in its_get_vlpi()
388 	return -ENODEV;  in its_init_v4()