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On PHB3/POWER8 systems, devices can select between two different sections of address space, TVE#0 and TVE#1. TVE#0 is intended for 32bit devices that aren't capable of addressing more than 4GB. Selecting TVE#1 instead, with the capability of addressing over 4GB, is performed by setting bit 59 of a PCI address. However, some devices aren't capable of addressing at least 59 bits, but still want more than 4GB of DMA space. In order to enable this, reconfigure TVE#0 to be suitable for 64-bit devices by allocating memory past the initial 4GB that is inaccessible by 64-bit DMAs. This bypass mode is only enabled if a device requests 4GB or more of DMA address space, if the system has PHB3 (POWER8 systems), and if the device does not share a PE with any devices from different vendors. Signed-off-by: Russell Currey <ruscur@russell.cc> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.