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934941ed5a
As the previous patch fixed the places where we walk the whole scatterlist for DMA addresses, this patch fixes the random lookup functionality. To achieve this we have to add a second lookup iterator and add a i915_gem_object_get_sg_dma helper, to be used analoguous to existing i915_gem_object_get_sg_dma. Therefore two lookup caches are maintained per object and they are flushed at the same point for simplicity. (Strictly speaking the DMA cache should be flushed from i915_gem_gtt_finish_pages, but today this conincides with unsetting of the pages in general.) Partial VMA view is then fixed to use the new DMA lookup and properly query sg length. v2: * Checkpatch. Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Matthew Auld <matthew.auld@intel.com> Cc: Lu Baolu <baolu.lu@linux.intel.com> Cc: Tom Murphy <murphyt7@tcd.ie> Cc: Logan Gunthorpe <logang@deltatee.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20201006092508.1064287-2-tvrtko.ursulin@linux.intel.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.