irqchip/loongarch: Fix irq_domain_alloc_fwnode() abuse

The recently merged LoongArch drivers paper over the lack of
topology information by creating a bunch of fwnodes for the
irqchips. So far, so good.

However, irq_domain_alloc_fwnode() is supposed to take a PA, and
not a kernel VA blindly cast as a PA, potentially disclosing
kernel VAs to userspace. In some other cases, even NULL is used
as the PA, which is entertaining.

Fix this by using the actual PA of the block when available,
and switch to a named fwnode in the other cases.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Jianmin Lv <lvjianmin@loongson.cn>
Link: https://lore.kernel.org/r/20220808105020.2689757-1-maz@kernel.org

Author: Marc Zyngier

drivers/irqchip/irq-loongarch-cpu.c

@@ -129,7 +129,7 @@ static int __init cpuintc_acpi_init(union acpi_subtable_headers *header,
 	clear_csr_ecfg(ECFG0_IM);
 	clear_csr_estat(ESTATF_IP);
 
-	cpuintc_handle = irq_domain_alloc_fwnode(NULL);
+	cpuintc_handle = irq_domain_alloc_named_fwnode("CPUINTC");
 	irq_domain = irq_domain_create_linear(cpuintc_handle, EXCCODE_INT_NUM,
 					&loongarch_cpu_intc_irq_domain_ops, NULL);
 

drivers/irqchip/irq-loongson-eiointc.c

@@ -348,7 +348,8 @@ int __init eiointc_acpi_init(struct irq_domain *parent,
 	if (!priv)
 		return -ENOMEM;
 
-	priv->domain_handle = irq_domain_alloc_fwnode((phys_addr_t *)acpi_eiointc);
+	priv->domain_handle = irq_domain_alloc_named_id_fwnode("EIOPIC",
+							       acpi_eiointc->node);
 	if (!priv->domain_handle) {
 		pr_err("Unable to allocate domain handle\n");
 		goto out_free_priv;

drivers/irqchip/irq-loongson-liointc.c

@@ -360,7 +360,7 @@ int __init liointc_acpi_init(struct irq_domain *parent, struct acpi_madt_lio_pic
 	parent_irq[0] = irq_create_mapping(parent, acpi_liointc->cascade[0]);
 	parent_irq[1] = irq_create_mapping(parent, acpi_liointc->cascade[1]);
 
-	domain_handle = irq_domain_alloc_fwnode((phys_addr_t *)acpi_liointc);
+	domain_handle = irq_domain_alloc_fwnode(&acpi_liointc->address);
 	if (!domain_handle) {
 		pr_err("Unable to allocate domain handle\n");
 		return -ENOMEM;

drivers/irqchip/irq-loongson-pch-msi.c

@@ -282,7 +282,7 @@ int __init pch_msi_acpi_init(struct irq_domain *parent,
 	int ret;
 	struct fwnode_handle *domain_handle;
 
-	domain_handle = irq_domain_alloc_fwnode((phys_addr_t *)acpi_pchmsi);
+	domain_handle = irq_domain_alloc_fwnode(&acpi_pchmsi->msg_address);
 	ret = pch_msi_init(acpi_pchmsi->msg_address, acpi_pchmsi->start,
 				acpi_pchmsi->count, parent, domain_handle);
 	if (ret < 0)

drivers/irqchip/irq-loongson-pch-pic.c

@@ -349,7 +349,7 @@ int __init pch_pic_acpi_init(struct irq_domain *parent,
 
 	vec_base = acpi_pchpic->gsi_base - GSI_MIN_PCH_IRQ;
 
-	domain_handle = irq_domain_alloc_fwnode((phys_addr_t *)acpi_pchpic);
+	domain_handle = irq_domain_alloc_fwnode(&acpi_pchpic->address);
 	if (!domain_handle) {
 		pr_err("Unable to allocate domain handle\n");
 		return -ENOMEM;