XDMA: Driver hangs during streaming test got a block size larger than 1 MB

[rsarwar87]

driver becomes non responsive. terminating the program and restarting the application does not work as the drivers fail to do anything after wards

I have made a workaround by commenting out the cyclic bugger, but I presume there is a better solution to the problem

index 029d0d3..654b44f 100644
--- a/XDMA/linux-kernel/xdma/cdev_sgdma.c
+++ b/XDMA/linux-kernel/xdma/cdev_sgdma.c
@@ -312,13 +312,13 @@ static ssize_t char_sgdma_read(struct file *file, char __user *buf,
 
        engine = xcdev->engine;
 
-       if (engine->streaming && engine->dir == DMA_FROM_DEVICE) {
-               rv = xdma_cyclic_transfer_setup(engine);
-               if (rv < 0 && rv != -EBUSY)
-                       return rv;
-               /* 600 sec. timeout */
-               return xdma_engine_read_cyclic(engine, buf, count, 600000);
-       }
+       //if (engine->streaming && engine->dir == DMA_FROM_DEVICE) {
+       //      rv = xdma_cyclic_transfer_setup(engine);
+       //      if (rv < 0 && rv != -EBUSY)
+       //              return rv;
+       //       /* 600 sec. timeout */
+       //      return xdma_engine_read_cyclic(engine, buf, count, 600000);
+       //}
 
         return char_sgdma_read_write(file, (char *)buf, count, pos, 0);
 }

[Thesane]

I found the issue is related to CYCLIC_RX_PAGES_MAX * PAGE_SIZE (1MB) which causes an overrun (head == tail) and doesn't reset properly. I am trying to figure out a fix for it to make cyclic C2H work. Also I have already tried the same workaround you did, however I noticed a low memory corruption error in the kern.log which happens a few seconds after the transfer is complete

[hmaarrfk]

Hello,

My name is Mark Harfouche. I am not affiliated with Xilinx in any way. Over the
years of using QDMA, I've been wanted better community organization.

I've created a fork of dma_ip_drivers which I intend to maintain and work with the
community at large to improve.

The fork can be found https://github.com/hmaarrfk/dma_ip_drivers

For now, I am stating the main goals of the repository in
hmaarrfk#2

If you are interested in working together, feel free to open an issue or PR to
my fork.

Best,

Mark