Linux interrupt is not handled by the wrapper driver - linux

Question

I am writing a device specific DMA driver for Zynq AXI DMA. The driver is actually a wrapper driver and uses Xilinx DMA driver under the DMA engine driver framework like this:
+------------------+
| Wrapper driver |
+------------------+
| DMA framework |
+------------------+
| Xilinx DMA Driver|
+------------------+
+ Kernel +
+------------------+
I use interrupt 61 for transfer complete and 62 for receive complete. The interrupt handler for Xilinx DMA driver is properly installed (I checked /proc/interrupts). However, I the driver seems not to handle the interrupt properly by showing me this:
I checked /proc/interrupts. IRQ62 is not handled. Here is the code where the interrupt is registered:
0986 /* find the IRQ line, if it exists in the device tree */
0987 chan->irq = irq_of_parse_and_map(node, 0);
0988 err = devm_request_irq(xdev->dev, chan->irq, dma_intr_handler,
0989 IRQF_SHARED,
0990 "xilinx-dma-controller", chan);
And here is the output of cat /proc/interrupt:
I have two questions:
1) If I only install interrupt handler for Xilinx DMA driver but not the wrapper driver, while I use the wrapper driver as the char device, interrupt will not be handled by the Xilinx DMA driver?
2) If so, how do I let Xilinx DMA driver to handle the interrupt in this case? Is 'irqpoll' the only solution? Is there any performance issue compared to direct interrupt handling rather than polling?

Answer 1

Your devicetree isn't good, more precisely, your pl.dtsi file. My pl file looks like this:
amba_pl: amba_pl {
#address-cells = <1>;
#size-cells = <1>;
compatible = "simple-bus";
ranges ;
axi_dma_0: dma#40400000 {
compatible = "xlnx,axi-dma";
interrupt-parent = <&intc>;
interrupts = <0 29 4 0 30 4>;
reg = <0x40400000 0x10000>;
xlnx,include-sg ;
dma-channel#40400000 {
compatible = "xlnx,axi-dma-mm2s-channel";
interrupts = <0 29 4>;
xlnx,datawidth = <0x20>;
xlnx,device-id = <0x0>;
};
dma-channel#40400030 {
compatible = "xlnx,axi-dma-s2mm-channel";
interrupts = <0 30 4>;
xlnx,datawidth = <0x20>;
xlnx,device-id = <0x0>;
};
};
};