From: Will Deacon <will@kernel.org>
To: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org
Cc: Bjorn Helgaas <bhelgaas@google.com>,
Robin Murphy <robin.murphy@arm.com>,
Will Deacon <will@kernel.org>
Subject: [PATCH 0/7] iommu: Permit modular builds of ARM SMMU[v3] drivers
Date: Wed, 30 Oct 2019 14:51:05 +0000 [thread overview]
Message-ID: <20191030145112.19738-1-will@kernel.org> (raw)
Hi all,
As part of the work to enable a "Generic Kernel Image" across multiple
Android devices, there is a need to seperate shared, core kernel code
from modular driver code that may not be needed by all SoCs. This means
building IOMMU drivers as modules.
It turns out that most of the groundwork has already been done to enable
the ARM SMMU drivers to be 'tristate' options in drivers/iommu/Kconfig;
with a few symbols exported from the IOMMU/PCI core, everything builds
nicely out of the box. The one exception is support for the legacy SMMU
DT binding, which is not in widespread use and has never worked with
modules, so we can simply remove that when building as a module rather
than try to paper over it with even more hacks.
Obviously you need to be careful about using IOMMU drivers as modules,
since late loading of the driver for an IOMMU serving active DMA masters
is going to end badly in many cases. On Android, we're using device links
to ensure that the IOMMU probes first.
Comments welcome,
Will
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
--->8
Will Deacon (7):
drivers/iommu: Export core IOMMU API symbols to permit modular drivers
iommu/of: Request ACS from the PCI core when configuring IOMMU linkage
PCI: Export pci_ats_disabled() as a GPL symbol to modules
Revert "iommu/arm-smmu: Make arm-smmu-v3 explicitly non-modular"
iommu/arm-smmu-v3: Allow building as a module
Revert "iommu/arm-smmu: Make arm-smmu explicitly non-modular"
iommu/arm-smmu: Allow building as a module
drivers/iommu/Kconfig | 16 ++++++-
drivers/iommu/arm-smmu-impl.c | 6 +++
drivers/iommu/arm-smmu-v3.c | 26 +++++++----
drivers/iommu/arm-smmu.c | 86 +++++++++++++++++++++--------------
drivers/iommu/iommu-sysfs.c | 5 ++
drivers/iommu/iommu.c | 8 ++++
drivers/iommu/of_iommu.c | 1 +
drivers/pci/pci.c | 1 +
8 files changed, 102 insertions(+), 47 deletions(-)
--
2.24.0.rc0.303.g954a862665-goog
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next reply other threads:[~2019-10-30 14:51 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-30 14:51 Will Deacon [this message]
2019-10-30 14:51 ` [PATCH 1/7] drivers/iommu: Export core IOMMU API symbols to permit modular drivers Will Deacon
2019-10-30 14:51 ` [PATCH 2/7] iommu/of: Request ACS from the PCI core when configuring IOMMU linkage Will Deacon
2019-10-30 14:51 ` [PATCH 3/7] PCI: Export pci_ats_disabled() as a GPL symbol to modules Will Deacon
2019-10-30 20:30 ` Bjorn Helgaas
2019-10-30 14:51 ` [PATCH 4/7] Revert "iommu/arm-smmu: Make arm-smmu-v3 explicitly non-modular" Will Deacon
2019-10-30 14:51 ` [PATCH 5/7] iommu/arm-smmu-v3: Allow building as a module Will Deacon
2019-10-30 19:31 ` Joerg Roedel
2019-10-31 15:42 ` Will Deacon
2019-11-04 19:15 ` Jean-Philippe Brucker
2019-11-08 14:54 ` Will Deacon
2019-11-05 12:15 ` Joerg Roedel
2019-11-08 11:03 ` Will Deacon
2019-10-30 14:51 ` [PATCH 6/7] Revert "iommu/arm-smmu: Make arm-smmu explicitly non-modular" Will Deacon
2019-10-30 23:09 ` Jordan Crouse
2019-10-31 12:03 ` Will Deacon
2019-10-31 15:32 ` Jordan Crouse
2019-10-30 14:51 ` [PATCH 7/7] iommu/arm-smmu: Allow building as a module Will Deacon
2019-10-30 15:22 ` Rob Herring
2019-10-30 15:26 ` Will Deacon
2019-10-30 15:33 ` Robin Murphy
2019-11-04 19:34 ` Isaac J. Manjarres
2019-11-07 12:48 ` Will Deacon
2019-10-30 15:35 ` [PATCH 0/7] iommu: Permit modular builds of ARM SMMU[v3] drivers Robin Murphy
2019-10-30 15:54 ` Will Deacon
2019-10-31 0:57 ` Saravana Kannan via iommu
2019-10-31 19:37 ` Jean-Philippe Brucker
2019-10-31 23:34 ` Saravana Kannan via iommu
2019-11-01 10:27 ` John Garry
2019-11-01 21:13 ` Saravana Kannan via iommu
2019-11-04 12:16 ` John Garry
2019-11-04 13:29 ` Robin Murphy
2019-11-07 6:11 ` Saravana Kannan via iommu
2019-11-07 9:13 ` Jean-Philippe Brucker
2019-11-07 6:02 ` Saravana Kannan via iommu
2019-11-01 11:41 ` Jean-Philippe Brucker
2019-11-01 12:28 ` Lorenzo Pieralisi
2019-11-01 21:26 ` Saravana Kannan via iommu
2019-11-04 11:43 ` Lorenzo Pieralisi
2019-11-07 5:55 ` Saravana Kannan via iommu
2019-11-01 17:21 ` Will Deacon
2019-11-04 7:54 ` Jean-Philippe Brucker
2019-11-07 6:16 ` Saravana Kannan via iommu
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