[PATCH v8 05/10] PCI: dwc: split MSI IRQ parsing/allocation to a separate function

[Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>]

Split handling of MSI host IRQs to a separate dw_pcie_msi_host_init()
function. The code is complex enough to warrant a separte function.
Adding another bit to support multiple host MSI IRQs would make it
overcomplicated.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
---
 .../pci/controller/dwc/pcie-designware-host.c | 97 +++++++++++--------
 1 file changed, 55 insertions(+), 42 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 5f6590929319..6b0c7b75391f 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -288,6 +288,59 @@ static void dw_pcie_msi_init(struct pcie_port *pp)
 	dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_HI, upper_32_bits(msi_target));
 }
 
+static int dw_pcie_msi_host_init(struct pcie_port *pp)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	struct platform_device *pdev = to_platform_device(pci->dev);
+	int ret;
+	u32 ctrl, num_ctrls;
+
+	num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
+	for (ctrl = 0; ctrl < num_ctrls; ctrl++)
+		pp->irq_mask[ctrl] = ~0;
+
+	if (!pp->msi_irq[0]) {
+		int irq = platform_get_irq_byname_optional(pdev, "msi");
+
+		if (irq < 0) {
+			irq = platform_get_irq(pdev, 0);
+			if (irq < 0)
+				return irq;
+		}
+		pp->msi_irq[0] = irq;
+	}
+
+	pp->msi_irq_chip = &dw_pci_msi_bottom_irq_chip;
+
+	ret = dw_pcie_allocate_domains(pp);
+	if (ret)
+		return ret;
+
+	for (ctrl = 0; ctrl < num_ctrls; ctrl++)
+		if (pp->msi_irq[ctrl] > 0)
+			irq_set_chained_handler_and_data(pp->msi_irq[ctrl],
+							 dw_chained_msi_isr,
+							 pp);
+
+	ret = dma_set_mask(pci->dev, DMA_BIT_MASK(32));
+	if (ret)
+		dev_warn(pci->dev, "Failed to set DMA mask to 32-bit. Devices with only 32-bit MSI support may not work properly\n");
+
+	pp->msi_data = dma_map_single_attrs(pci->dev, &pp->msi_msg,
+				      sizeof(pp->msi_msg),
+				      DMA_FROM_DEVICE,
+				      DMA_ATTR_SKIP_CPU_SYNC);
+	ret = dma_mapping_error(pci->dev, pp->msi_data);
+	if (ret) {
+		dev_err(pci->dev, "Failed to map MSI data: %d\n", ret);
+		pp->msi_data = 0;
+		dw_pcie_free_msi(pp);
+		return ret;
+	}
+
+	return 0;
+}
+
 int dw_pcie_host_init(struct pcie_port *pp)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
@@ -365,49 +418,9 @@ int dw_pcie_host_init(struct pcie_port *pp)
 			if (ret < 0)
 				return ret;
 		} else if (pp->has_msi_ctrl) {
-			u32 ctrl, num_ctrls;
-
-			num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
-			for (ctrl = 0; ctrl < num_ctrls; ctrl++)
-				pp->irq_mask[ctrl] = ~0;
-
-			if (!pp->msi_irq[0]) {
-				int irq = platform_get_irq_byname_optional(pdev, "msi");
-
-				if (irq < 0) {
-					irq = platform_get_irq(pdev, 0);
-					if (irq < 0)
-						return irq;
-				}
-				pp->msi_irq[0] = irq;
-			}
-
-			pp->msi_irq_chip = &dw_pci_msi_bottom_irq_chip;
-
-			ret = dw_pcie_allocate_domains(pp);
-			if (ret)
+			ret = dw_pcie_msi_host_init(pp);
+			if (ret < 0)
 				return ret;
-
-			for (ctrl = 0; ctrl < num_ctrls; ctrl++)
-				if (pp->msi_irq[ctrl] > 0)
-					irq_set_chained_handler_and_data(pp->msi_irq[ctrl],
-									 dw_chained_msi_isr,
-									 pp);
-
-			ret = dma_set_mask(pci->dev, DMA_BIT_MASK(32));
-			if (ret)
-				dev_warn(pci->dev, "Failed to set DMA mask to 32-bit. Devices with only 32-bit MSI support may not work properly\n");
-
-			pp->msi_data = dma_map_single_attrs(pci->dev, &pp->msi_msg,
-						      sizeof(pp->msi_msg),
-						      DMA_FROM_DEVICE,
-						      DMA_ATTR_SKIP_CPU_SYNC);
-			ret = dma_mapping_error(pci->dev, pp->msi_data);
-			if (ret) {
-				dev_err(pci->dev, "Failed to map MSI data: %d\n", ret);
-				pp->msi_data = 0;
-				goto err_free_msi;
-			}
 		}
 	}
 
-- 
2.35.1