From: Laurentiu Tudor <laurentiu.tudor@nxp.com>
To: Robin Murphy <robin.murphy@arm.com>, Li Yang <leoyang.li@nxp.com>,
Olof Johansson <olof@lixom.net>
Cc: "mark.rutland@arm.com" <mark.rutland@arm.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
"arnd@arndb.de" <arnd@arndb.de>,
"m.karthikeyan@mobiveil.co.in" <m.karthikeyan@mobiveil.co.in>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"Z.q. Hou" <zhiqiang.hou@nxp.com>,
"l.subrahmanya@mobiveil.co.in" <l.subrahmanya@mobiveil.co.in>,
"will.deacon@arm.com" <will.deacon@arm.com>,
Russell King - ARM Linux admin <linux@armlinux.org.uk>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"M.h. Lian" <minghuan.lian@nxp.com>,
"robh+dt@kernel.org" <robh+dt@kernel.org>,
Xiaowei Bao <xiaowei.bao@nxp.com>,
"catalin.marinas@arm.com" <catalin.marinas@arm.com>,
"bhelgaas@google.com" <bhelgaas@google.com>,
"andrew.murray@arm.com" <andrew.murray@arm.com>,
"shawnguo@kernel.org" <shawnguo@kernel.org>,
Mingkai Hu <mingkai.hu@nxp.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Diana Madalina Craciun <diana.craciun@nxp.com>
Subject: Re: [PATCHv9 00/12] PCI: Recode Mobiveil driver and add PCIe Gen4 driver for NXP Layerscape SoCs
Date: Tue, 11 Feb 2020 15:55:20 +0200 [thread overview]
Message-ID: <27e0acfc-0782-bd97-a80e-1143f1315891@nxp.com> (raw)
In-Reply-To: <aec47903-50e4-c61b-6aec-63e3e9bc9332@arm.com>
On 11.02.2020 15:04, Robin Murphy wrote:
> On 2020-02-11 12:13 pm, Laurentiu Tudor wrote:
> [...]
>>> This is a known issue about DPAA2 MC bus not working well with SMMU
>>> based IO mapping. Adding Laurentiu to the chain who has been looking
>>> into this issue.
>>
>> Yes, I'm closely following the issue. I actually have a workaround
>> (attached) but haven't submitted as it will probably raise a lot of
>> eyebrows. In the mean time I'm following some discussions [1][2][3] on
>> the iommu list which seem to try to tackle what appears to be a
>> similar issue but with framebuffers. My hope is that we will be able
>> to leverage whatever turns out.
>
> Indeed it's more general than framebuffers - in fact there was a
> specific requirement from the IORT side to accommodate network/storage
> controllers with in-memory firmware/configuration data/whatever set up
> by the bootloader that want to be handed off 'live' to Linux because the
> overhead of stopping and restarting them is impractical. Thus this DPAA2
> setup is very much within scope of the desired solution, so please feel
> free to join in (particularly on the DT parts) :)
Will sure do. Seems that the 2nd approach (the one with list of
compatibles in arm-smmu) fits really well with our scenario. Will this
be the way to go forward?
> As for right now, note that your patch would only be a partial
> mitigation to slightly reduce the fault window but not remove it
> entirely. To be robust the SMMU driver *has* to know about live streams
> before the first arm_smmu_reset() - hence the need for generic firmware
> bindings - so doing anything from the MC driver is already too late (and
> indeed the current iommu_request_dm_for_dev() mechanism is itself a
> microcosm of the same problem).
I think you might have missed in the patch that it pauses the firmware
at early boot, in its driver init and it resumes it only after
iommu_request_dm_for_dev() has completed. :)
---
Best Regards, Laurentiu
next prev parent reply other threads:[~2020-02-11 13:55 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-20 3:45 [PATCHv9 00/12] PCI: Recode Mobiveil driver and add PCIe Gen4 driver for NXP Layerscape SoCs Z.q. Hou
2019-11-20 3:45 ` [PATCHv9 01/12] PCI: mobiveil: Re-abstract the private structure Z.q. Hou
2020-01-13 10:09 ` Andrew Murray
2020-02-06 11:04 ` Z.q. Hou
2020-02-06 11:27 ` Andrew Murray
2019-11-20 3:45 ` [PATCHv9 02/12] PCI: mobiveil: Move the host initialization into a routine Z.q. Hou
2020-01-13 10:19 ` Andrew Murray
2020-02-06 11:14 ` Z.q. Hou
2019-11-20 3:45 ` [PATCHv9 03/12] PCI: mobiveil: Collect the interrupt related operations " Z.q. Hou
2020-01-13 10:34 ` Andrew Murray
2020-02-06 11:30 ` Z.q. Hou
2019-11-20 3:45 ` [PATCHv9 04/12] PCI: mobiveil: Modularize the Mobiveil PCIe Host Bridge IP driver Z.q. Hou
2020-01-13 11:05 ` Andrew Murray
2020-02-06 12:25 ` Z.q. Hou
2019-11-20 3:45 ` [PATCHv9 05/12] PCI: mobiveil: Add callback function for interrupt initialization Z.q. Hou
2020-01-13 11:19 ` Andrew Murray
2020-02-06 13:25 ` Z.q. Hou
2019-11-20 3:45 ` [PATCHv9 06/12] PCI: mobiveil: Add callback function for link up check Z.q. Hou
2020-01-13 11:22 ` Andrew Murray
2020-02-06 13:25 ` Z.q. Hou
2019-11-20 3:46 ` [PATCHv9 07/12] PCI: mobiveil: Make mobiveil_host_init() can be used to re-init host Z.q. Hou
2020-01-13 11:26 ` Andrew Murray
2020-02-06 13:27 ` Z.q. Hou
2019-11-20 3:46 ` [PATCHv9 08/12] PCI: mobiveil: Add 8-bit and 16-bit CSR register accessors Z.q. Hou
2020-01-13 11:31 ` Andrew Murray
2020-02-06 13:45 ` Z.q. Hou
2019-11-20 3:46 ` [PATCHv9 09/12] dt-bindings: PCI: Add NXP Layerscape SoCs PCIe Gen4 controller Z.q. Hou
2019-11-20 3:46 ` [PATCHv9 10/12] PCI: mobiveil: Add PCIe Gen4 RC driver for NXP Layerscape SoCs Z.q. Hou
2020-01-13 12:02 ` Andrew Murray
2020-02-06 13:45 ` Z.q. Hou
2020-02-06 14:29 ` Andrew Murray
2019-11-20 3:46 ` [PATCHv9 11/12] arm64: dts: lx2160a: Add PCIe controller DT nodes Z.q. Hou
2019-11-20 3:46 ` [PATCHv9 12/12] arm64: defconfig: Enable CONFIG_PCIE_LAYERSCAPE_GEN4 Z.q. Hou
2019-11-20 9:57 ` [PATCHv9 00/12] PCI: Recode Mobiveil driver and add PCIe Gen4 driver for NXP Layerscape SoCs Russell King - ARM Linux admin
2019-11-20 10:30 ` Z.q. Hou
2019-12-13 18:37 ` Olof Johansson
2019-12-17 2:50 ` Z.q. Hou
2020-01-10 15:33 ` Lorenzo Pieralisi
2020-01-10 17:05 ` Olof Johansson
2020-02-06 10:57 ` Z.q. Hou
2020-02-10 15:12 ` Olof Johansson
2020-02-10 15:22 ` Russell King - ARM Linux admin
2020-02-10 15:28 ` Olof Johansson
2020-02-10 16:15 ` Russell King - ARM Linux admin
2020-02-10 17:20 ` Russell King - ARM Linux admin
2020-02-10 18:33 ` Olof Johansson
2020-02-10 18:41 ` Li Yang
2020-02-10 19:48 ` Li Yang
2020-02-11 12:13 ` Laurentiu Tudor
2020-02-11 13:04 ` Robin Murphy
2020-02-11 13:55 ` Laurentiu Tudor [this message]
2020-02-11 14:51 ` Robin Murphy
2020-02-11 14:48 ` Olof Johansson
2020-02-11 15:14 ` Laurentiu Tudor
2020-02-10 15:33 ` Lorenzo Pieralisi
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