PCIe Drivers ? JetPack-L4T-2.2 - JetPack-L4T-2.3 DIFF

Autonomous Machines Jetson & Embedded Systems Jetson TX1
1

Hello Dusty /Jetson Team,

After i upgraded JetPack-L4T-2.2 to JetPack-L4T-2.3 i am having issues with PCIe drivers.
are the drivers changes done by Nvidia or is it by Canonical team ?

How can i revert back to old drivers and what is the reason for changing drivers.

2

Can you be more specific, what do you mean by PCIe drivers? The root complex driver?

3

I am using a Dual PCIe Ethernet card it was working fine, with previous JetPack.

May  6 10:40:14 tegra-ubuntu NetworkManager[603]: <info>  [1462531214.1858] device (eth1): link disconnected (deferring action for 4 seconds)
May  6 10:40:14 tegra-ubuntu kernel: [18014.167388] mc-err: Too many MC errors; throttling prints
May  6 10:40:17 tegra-ubuntu NetworkManager[603]: <info>  [1462531217.0339] device (eth1): link connected
May  6 10:40:17 tegra-ubuntu kernel: [18016.938418] e1000e: eth1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None
May  6 10:40:17 tegra-ubuntu kernel: [18017.128608] smmu_dump_pagetable(): fault_address=0x0000000000000000 pa=0xffffffffffffffff bytes=ffffffffffffffff #pte=0 in L2
May  6 10:40:17 tegra-ubuntu kernel: [18017.140362] mc-err: (0) csw_afiw: EMEM decode error on PDE or PTE entry
May  6 10:40:17 tegra-ubuntu kernel: [18017.147306] mc-err:   status = 0x60010031; addr = 0x00000000
May  6 10:40:17 tegra-ubuntu kernel: [18017.153119] mc-err:   secure: no, access-type: write, SMMU fault: nr-nw-s
May  6 10:40:18 tegra-ubuntu kernel: [18018.284660] smmu_dump_pagetable(): fault_address=0x00000000e7102000 pa=0xffffffffffffffff bytes=ffffffffffffffff #pte=0 in L2
4

Please apply the following patch

--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -2112,7 +2112,8 @@ static dma_addr_t arm_coherent_iommu_map_page(struct device *dev, struct page *p
     * compound page then there's probably a bug somewhere.
     */
    if (page_offset > 0)
-       BUG_ON(page_count(page) == 1);
+       BUG_ON(page_offset > (1 << compound_order(compound_head(page)))
+           - ((page - compound_head(page)) << PAGE_SHIFT));

    dma_addr = __alloc_iova(mapping, len, attrs);
    if (dma_addr == DMA_ERROR_CODE)
5

@raak, Can you please confirm if the above patch works fine for you?

6

No, it did not, we are using stripped down version of Ubuntu 14 and on Ubuntu 16 its now working.
Its an custom carrier board. But issue exists on devkit too

7

Can you post the output of /etc/nv_tegra_release ?

8

Hi raak,

Is this still an issue in your side?
Or issue has been clarified and resolved?

Thanks

9

Hi Kaycc,

We wrote our own drivers, issue is resolved.

Thanks