svn commit: r354218 - head/sys/dev/ena

[John Baldwin]

On 10/31/19 8:38 AM, Marcin Wojtas wrote:
> Author: mw
> Date: Thu Oct 31 15:38:17 2019
> New Revision: 354218
> URL: https://svnweb.freebsd.org/changeset/base/354218
> 
> Log:
>   Add WC support for arm64 in the ENA driver
>   
>   As the pmamp_change_attr() is public on arm64 since r351131, it can be
>   used on the arm64 to map memory range as with the write combined
>   attribute.
>   
>   It requires the driver to use generic VM_MEMATTR_WRITE_COMBINING flag
>   instead of the x86 specific PAT_WRITE_COMBINING.
>   
>   Differential Revision: https://reviews.freebsd.org/D21931
>   Submitted by:  Michal Krawczyk <mk at semihalf.com>
>   Obtained from: Semihalf
>   Sponsored by:  Amazon, Inc.

This isn't the right API for this, but the right API isn't ready yet on
arm64.  I have a patch to add bus_map_resource support on all platforms
that I'm working on testing, and that will be the right way to request
this in the future once it lands.

-- 
-- 
John Baldwin