[PATCH v3 7/7] irqchip/gic-v5: Enable GICv5 IWB ACPI probe ordering detection

[Lorenzo Pieralisi <lpieralisi@kernel.org>]

Register an ACPI hook in the ACPI interrupt management code for GICv5 to
retrieve the ACPI interrupt controller handle (if any) of the controller
handling a specific GSI, by updating the acpi_set_irq_model() call with
the gic_v5_get_gsi_handle() function pointer parameter.

gicv5_get_gsi_handle() allows ACPI core to detect the ACPI handle
of the controller that manages a specific GSI interrupt.

Update the IWB driver to clear device dependencies in ACPI core once the
IWB driver has probed.

Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Cc: Thomas Gleixner <tglx@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
---
 drivers/irqchip/irq-gic-v5-iwb.c |  2 ++
 drivers/irqchip/irq-gic-v5.c     | 11 ++++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v5-iwb.c b/drivers/irqchip/irq-gic-v5-iwb.c
index 9103feb70ce8..2546fc74dd99 100644
--- a/drivers/irqchip/irq-gic-v5-iwb.c
+++ b/drivers/irqchip/irq-gic-v5-iwb.c
@@ -269,6 +269,8 @@ static int gicv5_iwb_device_probe(struct platform_device *pdev)
 	if (IS_ERR(iwb_node))
 		return PTR_ERR(iwb_node);
 
+	acpi_device_clear_dep(&pdev->dev);
+
 	return 0;
 }
 
diff --git a/drivers/irqchip/irq-gic-v5.c b/drivers/irqchip/irq-gic-v5.c
index 7ea39cb19f75..5dcf404ab4c8 100644
--- a/drivers/irqchip/irq-gic-v5.c
+++ b/drivers/irqchip/irq-gic-v5.c
@@ -1231,6 +1231,14 @@ static struct fwnode_handle *gic_v5_get_gsi_domain_id(u32 gsi)
 	return gsi_domain_handle;
 }
 
+static acpi_handle gic_v5_get_gsi_handle(u32 gsi)
+{
+	if (FIELD_GET(GICV5_GSI_IC_TYPE, gsi) == GICV5_GSI_IWB_TYPE)
+		return iort_iwb_handle(FIELD_GET(GICV5_GSI_IWB_FRAME_ID, gsi));
+
+	return NULL;
+}
+
 static int __init gic_acpi_init(union acpi_subtable_headers *header, const unsigned long end)
 {
 	struct acpi_madt_gicv5_irs *irs = (struct acpi_madt_gicv5_irs *)header;
@@ -1251,7 +1259,8 @@ static int __init gic_acpi_init(union acpi_subtable_headers *header, const unsig
 	if (ret)
 		goto out_irs;
 
-	acpi_set_irq_model(ACPI_IRQ_MODEL_GIC_V5, gic_v5_get_gsi_domain_id, NULL);
+	acpi_set_irq_model(ACPI_IRQ_MODEL_GIC_V5, gic_v5_get_gsi_domain_id,
+			   gic_v5_get_gsi_handle);
 
 	return 0;
 

-- 
2.34.1