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If at first we don't succeed, try try again. Not all engines may support the MI ops we need to perform asynchronous relocation patching, and so we end up falling back to a synchronous operation that has a liability of blocking. However, Tvrtko pointed out we don't need to use the same engine to perform the relocations as we are planning to execute the execbuf on, and so if we switch over to a working engine, we can perform the relocation asynchronously. The user execbuf will be queued after the relocations by virtue of fencing. This patch creates a new context per execbuf requiring asynchronous relocations on an unusable engines. This is perhaps a bit excessive and can be ameliorated by a small context cache, but for the moment we only need it for working around a little used engine on Sandybridge, and only if relocations are actually required to an active batch buffer. Now we just need to teach the relocation code to handle physical addressing for gen2/3, and we should then have universal support! Suggested-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Testcase: igt/gem_exec_reloc/basic-spin # snb Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200501192945.22215-3-chris@chris-wilson.co.uk
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.