• Ian Munsie's avatar
    cxl: Add kernel API to allow a context to operate with relocate disabled · 7a0d85d3
    Ian Munsie authored
    cxl devices typically access memory using an MMU in much the same way as
    the CPU, and each context includes a state register much like the MSR in
    the CPU. Like the CPU, the state register includes a bit to enable
    relocation, which we currently always enable.
    In some cases, it may be desirable to allow a device to access memory
    using real addresses instead of effective addresses, so this adds a new
    API, cxl_set_translation_mode, that can be used to disable relocation
    on a given kernel context. This can allow for the creation of a special
    privileged context that the device can use if it needs relocation
    disabled, and can use regular contexts at times when it needs relocation
    This interface is only available to users of the kernel API for obvious
    reasons, and will never be supported in a virtualised environment.
    This will be used by the upcoming cxl support in the mlx5 driver.
    Signed-off-by: default avatarIan Munsie <imunsie@au1.ibm.com>
    Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
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