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90199c951b
The iProc host controller allows only a subset of physical address space as
target of inbound PCI memory transaction addresses.
PCI device memory transactions targeting memory regions that are not
allowed for inbound transactions in the host controller are rejected by the
host controller and cannot reach the upstream buses.
The firmware device tree description defines the DMA ranges that are
addressable by devices DMA transactions; parse the device tree dma-ranges
property and add its ranges to the PCI host bridge dma_ranges list; the
iova_reserve_pci_windows() call executed at iommu_dma_init_domain() will
reserve the IOVA address ranges that are not addressable (ie memory holes
in the dma-ranges set) so that they are not allocated to PCI devices for
DMA transfers.
All allowed address ranges are listed in the dma-ranges DT parameter. For
example:
dma-ranges = < \
0x43000000 0x00 0x80000000 0x00 0x80000000 0x00 0x80000000 \
0x43000000 0x08 0x00000000 0x08 0x00000000 0x08 0x00000000 \
0x43000000 0x80 0x00000000 0x80 0x00000000 0x40 0x00000000>
In the above example of dma-ranges, memory address from
0x0 - 0x80000000,
0x100000000 - 0x800000000,
0x1000000000 - 0x8000000000 and
0x10000000000 - 0xffffffffffffffff.
are not allowed to be used as inbound addresses.
Based-on-a-patch-by: Oza Pawandeep <oza.oza@broadcom.com>
Signed-off-by: Srinath Mannam <srinath.mannam@broadcom.com>
[lorenzo.pieralisi@arm.com: updated commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
[bhelgaas: fix function prototype style]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Oza Pawandeep <poza@codeaurora.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.