lkml.org 
[lkml]   [2020]   [Jun]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH AUTOSEL 4.19 156/172] NTB: Revert the change to use the NTB device dev for DMA allocations
    Date
    From: Logan Gunthorpe <logang@deltatee.com>

    [ Upstream commit 40da7d9a93c8941737ef4a1208d32c13ce017fe1 ]

    Commit 417cf39cfea9 ("NTB: Set dma mask and dma coherent mask to NTB
    devices") started using the NTB device for DMA allocations which was
    turns out was wrong. If the IOMMU is enabled, such alloctanions will
    always fail with messages such as:

    DMAR: Allocating domain for 0000:02:00.1 failed

    This is because the IOMMU has not setup the device for such use.

    Change the tools back to using the PCI device for allocations seeing
    it doesn't make sense to add an IOMMU group for the non-physical NTB
    device. Also remove the code that sets the DMA mask as it no longer
    makes sense to do this.

    Fixes: 7f46c8b3a552 ("NTB: ntb_tool: Add full multi-port NTB API support")
    Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
    Tested-by: Alexander Fomichev <fomichev.ru@gmail.com>
    Signed-off-by: Jon Mason <jdmason@kudzu.us>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/ntb/ntb.c | 1 -
    1 file changed, 1 deletion(-)

    diff --git a/drivers/ntb/ntb.c b/drivers/ntb/ntb.c
    index c9a0912b175f..f8f75a504a58 100644
    --- a/drivers/ntb/ntb.c
    +++ b/drivers/ntb/ntb.c
    @@ -311,4 +311,3 @@ static void __exit ntb_driver_exit(void)
    bus_unregister(&ntb_bus);
    }
    module_exit(ntb_driver_exit);
    -
    --
    2.25.1
    \
     
     \ /
      Last update: 2020-06-18 03:46    [W:2.144 / U:0.008 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site