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For our convenience, and to avoid frequent allocations, we placed some lists we use for execbuf inside the common i915_vma struct. As we look to parallelise execbuf, such fields guarded by the struct_mutex BKL must be pulled under local control. Instead of using the i915_vma as our primary means of tracking the user's list of objects and their virtual mappings, we use a local eb_vma with the same lists as before (just now local not global). This should allow us to only perform the lookup of vma used for execution once during the execbuf ioctl, as currently we need to remove our secrets from inside i915_vma everytime we drop the struct_mutex as another execbuf may use the shared locations. Once potential user visible consequence is that we can remove the requirement that the execobj[] be unique, and only require that they do not conflict (i.e. you cannot softpin the same object into two locations. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200303204345.1859734-2-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.