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 Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- 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); -