From: Dave Jiang <dave.jiang@intel.com>
To: Logan Gunthorpe <logang@deltatee.com>,
linux-kernel@vger.kernel.org, linux-ntb@googlegroups.com,
Jon Mason <jdmason@kudzu.us>
Cc: Allen Hubbe <allenbh@gmail.com>, Serge Semin <fancer.lancer@gmail.com>
Subject: Re: [PATCH v3 0/8] Fix breakage caused by the NTB multi-port patchset
Date: Wed, 9 Jan 2019 12:32:12 -0700 [thread overview]
Message-ID: <57aae0aa-fb12-b686-9835-b5dc60d97878@intel.com> (raw)
In-Reply-To: <20190109192233.5752-1-logang@deltatee.com>
On 1/9/19 12:22 PM, Logan Gunthorpe wrote:
> Hey,
>
> I'm resending this because I've recently found out that the change we
> made to use the NTB struct device in DMA allocations is wrong and
> needs to be reverted. Turns out that, when running with an IOMMU,
> dma_alloc_coherent() will always fail if you pass it the NTB struct
> device. This is because the device has not been assigned an IOMMU
> group and the Intel IOMMU at least expect the devices to be on the PCI
> bus and be able to find a proper bus-dev-fn number through a struct
> pci device. Therefore, we must revert the change and I've changed
> patch 2 to do this and remove the no longer necessary DMA mask
> adjustments.
For the revert, I think we should cc stable as well.
>
> I'm not sure if we can get past the impass in getting this series merged:
> I still maintain every patch in this series is necessary to fix a
> regression and there's no way to add port numbers to switchtec in the
> crosslink configuration so it can't be fixed in the other way that was
> suggested.
>
> Logan
>
> --
>
> Changes since v2:
> - Rebased on v5.0-rc1
> - Modify Patch 2 to revert back to using the PCI struct device
> instead of the NTB struct device in DMA calls
> - Collected Allen's Acks
> - Collected Alexander's Tested-By
>
> Changes since v1:
> - Rebased onto ntb-next (there was a minor conflict in a recent change
> to the intel driver)
> - Collected Dave's Ack
>
> --
>
> Logan Gunthorpe (8):
> NTB: ntb_tool: reading the link file should not end in a NULL byte
> NTB: Revert the change to use the NTB device dev for DMA allocations
> NTB: Fix the default port and peer numbers for legacy drivers
> NTB: ntb_pingpong: Choose doorbells based on port number
> NTB: perf: Don't require one more memory window than number of peers
> NTB: perf: Fix support for hardware that doesn't have port numbers
> NTB: perf: Fix race condition when run with ntb_test
> NTB: ntb_test: Fix bug when counting remote files
>
> drivers/ntb/hw/amd/ntb_hw_amd.c | 4 ----
> drivers/ntb/hw/idt/ntb_hw_idt.c | 6 -----
> drivers/ntb/hw/intel/ntb_hw_gen1.c | 4 ----
> drivers/ntb/ntb.c | 9 ++------
> drivers/ntb/test/ntb_perf.c | 29 +++++++++++++++++++------
> drivers/ntb/test/ntb_pingpong.c | 14 +++++-------
> drivers/ntb/test/ntb_tool.c | 9 ++++----
> tools/testing/selftests/ntb/ntb_test.sh | 2 +-
> 8 files changed, 35 insertions(+), 42 deletions(-)
>
> --
> 2.19.0
>
next prev parent reply other threads:[~2019-01-09 19:32 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-09 19:22 [PATCH v3 0/8] Fix breakage caused by the NTB multi-port patchset Logan Gunthorpe
2019-01-09 19:22 ` [PATCH v3 1/8] NTB: ntb_tool: reading the link file should not end in a NULL byte Logan Gunthorpe
2019-01-09 19:22 ` [PATCH v3 2/8] NTB: Revert the change to use the NTB device dev for DMA allocations Logan Gunthorpe
2019-01-09 19:22 ` [PATCH v3 3/8] NTB: Fix the default port and peer numbers for legacy drivers Logan Gunthorpe
2019-01-09 19:22 ` [PATCH v3 4/8] NTB: ntb_pingpong: Choose doorbells based on port number Logan Gunthorpe
2019-01-09 19:22 ` [PATCH v3 5/8] NTB: perf: Don't require one more memory window than number of peers Logan Gunthorpe
2019-01-09 19:22 ` [PATCH v3 6/8] NTB: perf: Fix support for hardware that doesn't have port numbers Logan Gunthorpe
2019-01-09 19:22 ` [PATCH v3 7/8] NTB: perf: Fix race condition when run with ntb_test Logan Gunthorpe
2019-01-09 19:22 ` [PATCH v3 8/8] NTB: ntb_test: Fix bug when counting remote files Logan Gunthorpe
2019-01-09 19:32 ` Dave Jiang [this message]
2019-01-09 19:33 ` [PATCH v3 0/8] Fix breakage caused by the NTB multi-port patchset Logan Gunthorpe
2019-02-11 14:40 ` Jon Mason
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