18fd7f8aae
Add function that takes care of sending command to gsc cs. We start of with allocation of memory for our command intel_hdcp_gsc_message that contains gsc cs memory header as directed in specs followed by the actual payload hdcp message that we want to send. Spec states that we need to poll pending bit of response header around 20 times each try being 50ms apart hence adding that to current gsc_msg_send function Also we use the same function to take care of both sending and receiving hence no separate function to get the response. --v4 -Create common function to fill in gsc_mtl_header [Alan] -define host session bitmask [Alan] --v5 -use i915 directly instead of gt->i915 [Alan] -No need to make fields NULL as we are already using kzalloc [Alan] --v8 -change mechanism to reuse the same memory for one hdcp session[Alan] -fix header ordering -add comments to explain flags and host session mask [Alan] --v9 -remove gem obj from hdcp message as we can use i915_vma_unpin_and_release [Alan] -move hdcp message allocation and deallocation from hdcp2_enable and hdcp2_disable to init and teardown of HDCP [Alan] --v10 -remove unnecessary i915_vma_unpin [Alan] --v11 -fix comment style [Uma] Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com> Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Cc: Alan Pervin Teres <alan.previn.teres.alexis@intel.com> Cc: Uma Shankar <uma.shankar@intel.com> Cc: Anshuman Gupta <anshuman.gupta@intel.com> Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com> Reviewed-by: Alan Previn <alan.previn.teres.alexis@intel.com> Reviewed-by: Uma Shankar <uma.shankar@intel.com> Signed-off-by: Uma Shankar <uma.shankar@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230316092927.668980-6-suraj.kandpal@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.