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bperez77 / xilinx_axidma

A zero-copy Linux driver and a userspace interface library for Xilinx's AXI DMA and VDMA IP blocks. These serve as bridges for communication between the processing system and FPGA programmable logic fabric, through one of the DMA ports on the Zynq processing system. Distributed under the MIT License.
MIT License
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segmentation fault on insmod #151

Closed Sujjan19 closed 10 months ago

Sujjan19 commented 1 year ago

I am getting segmentation fault on running insmod xilinx-axidma.ko :

[ 702.381163] xilinx_axidma: loading out-of-tree module taints kernel. [ 702.388131] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 702.396157] Mem abort info: [ 702.398910] Exception class = DABT (current EL), IL = 32 bits [ 702.404818] SET = 0, FnV = 0 [ 702.407853] EA = 0, S1PTW = 0 [ 702.410973] Data abort info: [ 702.413843] ISV = 0, ISS = 0x00000006 [ 702.417662] CM = 0, WnR = 0 [ 702.420616] user pgtable: 4k pages, 39-bit VAs, pgd = ffffffc07b3ee000 [ 702.427125] [0000000000000000] pgd=000000007b3ab003, pud=000000007b3ab003, *pmd=0000000000000000 [ 702.436077] Internal error: Oops: 96000006 [#1] SMP [ 702.440921] Modules linked in: xilinx_axidma(O+) uio_pdrv_genirq [ 702.446914] CPU: 1 PID: 2273 Comm: insmod Tainted: G O 4.14.0-xilinx-v2018.1 #1 [ 702.455332] Hardware name: xlnx,zynqmp (DT) [ 702.459496] task: ffffffc07a41c580 task.stack: ffffff800d280000 [ 702.465415] PC is at axidma_of_parse_dma_nodes+0x3e4/0x5b8 [xilinx_axidma] [ 702.472269] LR is at axidma_of_parse_dma_nodes+0x254/0x5b8 [xilinx_axidma] [ 702.479115] pc : [] lr : [] pstate: 60000145 [ 702.486493] sp : ffffff800d2839e0 [ 702.489788] x29: ffffff800d2839e0 x28: ffffff8000a5cc40 [ 702.495084] x27: ffffffc07fef4d88 x26: ffffffc07a5a2ea0 [ 702.500379] x25: ffffffc07a5a2e80 x24: 0000000000000001 [ 702.505674] x23: 0000000000000020 x22: ffffffc07b3d9200 [ 702.510969] x21: 0000000000000000 x20: 0000000000000001 [ 702.516264] x19: ffffffc07feef850 x18: 0000000000000001 [ 702.521558] x17: 00000000004a59b0 x16: ffffff800810b398 [ 702.526853] x15: ffffffffffffffff x14: 0000000000000000 [ 702.532148] x13: 0000000000000010 x12: 0101010101010101 [ 702.537443] x11: 0000000000000010 x10: 0101010101010101 [ 702.542738] x9 : 0000000000000002 x8 : 7f7f7f7f7f7f7f7f [ 702.548033] x7 : 6d2c606c62ff726b x6 : 0000000000000000 [ 702.553327] x5 : 0000000000000001 x4 : 0000000000000000 [ 702.558622] x3 : 0000000000000069 x2 : ffffff8000a5b4e0 [ 702.563917] x1 : ffffff8000a5c772 x0 : 0000000000000000 [ 702.569213] Process insmod (pid: 2273, stack limit = 0xffffff800d280000) [ 702.575896] Call trace: [ 702.578327] Exception stack(0xffffff800d2838a0 to 0xffffff800d2839e0) [ 702.584753] 38a0: 0000000000000000 ffffff8000a5c772 ffffff8000a5b4e0 0000000000000069 [ 702.592566] 38c0: 0000000000000000 0000000000000001 0000000000000000 6d2c606c62ff726b [ 702.600378] 38e0: 7f7f7f7f7f7f7f7f 0000000000000002 0101010101010101 0000000000000010 [ 702.608190] 3900: 0101010101010101 0000000000000010 0000000000000000 ffffffffffffffff [ 702.616002] 3920: ffffff800810b398 00000000004a59b0 0000000000000001 ffffffc07feef850 [ 702.623814] 3940: 0000000000000001 0000000000000000 ffffffc07b3d9200 0000000000000020 [ 702.631627] 3960: 0000000000000001 ffffffc07a5a2e80 ffffffc07a5a2ea0 ffffffc07fef4d88 [ 702.639439] 3980: ffffff8000a5cc40 ffffff800d2839e0 ffffff8000a5abec ffffff800d2839e0 [ 702.647251] 39a0: ffffff8000a5ad7c 0000000060000145 ffffff800d2839e0 ffffff8000a5abec [ 702.655063] 39c0: 0000008000000000 0000000000000001 ffffff800d2839e0 ffffff8000a5ad7c [ 702.662886] [] axidma_of_parse_dma_nodes+0x3e4/0x5b8 [xilinx_axidma] [ 702.670784] [] axidma_dma_init+0xa4/0x280 [xilinx_axidma] [ 702.677726] [] axidma_probe+0x40/0xf0 [xilinx_axidma] [ 702.684318] [] platform_drv_probe+0x58/0xb8 [ 702.690043] [] driver_probe_device+0x22c/0x2d8 [ 702.696032] [] driver_attach+0xbc/0xc0 [ 702.701499] [] bus_for_each_dev+0x4c/0x98 [ 702.707054] [] driver_attach+0x20/0x28 [ 702.712350] [] bus_add_driver+0x1b8/0x228 [ 702.717905] [] driver_register+0x60/0xf8 [ 702.723374] [] platform_driver_register+0x40/0x48 [ 702.729807] [] axidma_init+0x18/0x1000 [xilinx_axidma] [ 702.736482] [] do_one_initcall+0x38/0x128 [ 702.742037] [] do_init_module+0x58/0x1b0 [ 702.747504] [] load_module+0x19fc/0x2150 [ 702.752972] [] SyS_init_module+0xf8/0x178 [ 702.758526] Exception stack(0xffffff800d283ec0 to 0xffffff800d284000) [ 702.764951] 3ec0: 000000001113a2e0 000000000000aee0 000000001113a260 000000001113a280 [ 702.772765] 3ee0: 0000000000000000 0000007f8d5d1580 0000007f8d6ac700 0000007f8d6ac700 [ 702.780577] 3f00: 0000000000000069 000000000000b001 0101010101010101 0000000000000000 [ 702.788389] 3f20: 0000000000000018 0000000000005b76 0000007f8d494d98 0000007f8d487d00 [ 702.796201] 3f40: 0000007f8d54ca80 00000000004a59b0 000000000000073f 0000007f8d6ac720 [ 702.804013] 3f60: 000000001113a2e0 000000001113a260 0000000000000002 0000007fd3ff33f8 [ 702.811825] 3f80: 0000000000000049 0000000000000000 00000000004a5000 0000000000000000 [ 702.819637] 3fa0: 0000000000000000 0000007fd3ff32c0 000000000040f368 0000007fd3ff31a0 [ 702.827449] 3fc0: 0000007f8d54caa4 0000000080000000 000000001113a2e0 0000000000000069 [ 702.835261] 3fe0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 702.843074] [] el0_svc_naked+0x24/0x28 [ 702.848367] Code: 58000ee2 2a1803e5 58000961 52800d23 (f94002a4) [ 702.854442] ---[ end trace 5233cb4a2c13e94a ]--- Segmentation fault

Note : My dma design only has rx channel

My system-user.dtsi:

/include/ "system-conf.dtsi"
/ {
};

/{
axidma_chrdev: axidma_chrdev@0 {
                compatible = "xlnx,axidma-chrdev";
                dmas = <&Path1_DMA 1>;
                dma-names = "rx_channel";
        };
};
&Path1_DMA {
        status = "okay";
        dma-channel@80004030 {
                xlnx,device-id = <0x0>;
                //dma-coherent;
        };
};

My device tree :

/dts-v1/;
{
  dma@80004000 {
                        #dma-cells = <0x1>;
                        clock-names = "s_axi_lite_aclk", "m_axi_sg_aclk", "m_axi_s2mm_aclk";
                        clocks = <0x3 0x47 0x3 0x47 0x35>;
                        compatible = "xlnx,axi-dma-1.00.a";
                        reg = <0x0 0x80004000 0x0 0x1000>;
                        xlnx,addrwidth = <0x20>;
                        linux,phandle = <0x36>;
                        phandle = <0x36>;

                        dma-channel@80004030 {
                                compatible = "xlnx,axi-dma-s2mm-channel";
                                dma-channels = <0x1>;
                                xlnx,datawidth = <0x20>;
                                xlnx,device-id = <0x1>;
                        };
                };

   axidma_chrdev@0 {
                compatible = "xlnx,axidma-chrdev";
                dmas = <0x33 0x1>;
                dma-names = "rx_channel";
        };
};

Any Suggestions would be appreciated.

Regards, Sujan

hamidrmt commented 1 year ago

I have same issue, You should enable two dma channels and give right device-id to dma channels in dts file and dmas property in chrdev should start with 0: dmas = <&axi_dma_0 0 &axi_dma_0 1> correct dmas = < &axi_dma_0 1> not correct

biyantingfeng1 commented 7 months ago

I have same issue, You should enable two dma channels and give right device-id to dma channels in dts file and dmas property in chrdev should start with 0: dmas = <&axi_dma_0 0 &axi_dma_0 1> correct dmas = < &axi_dma_0 1> not correct

Hi, hamidrmt, very thanks for the way you giving to solve this issue. I have a try but it didn't work well(also getting segmentation fault on running .ko). In PL, I only enable write channel, even so, should I enable two dma channels in system-user.dtsi or just one I needed?