mei: hdcp: match without driver name

Xe driver uses this component too, but current match function
matches by i915 driver name.
Remove dependency on i915 driver name in component_match function.
Use PCI header information to match Intel graphics device.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20240123101625.220365-2-tomas.winkler@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drm/i915/hdcp: Move away from master naming to arbiter

Rename variables to move away from master convention to
arbiter
%s/hdcp.master/hdcp.arbiter
%s/i915_hdcp_master/i915_hdcp_arbiter
%s/comp_master/comp_arbiter

--v2
- delete i915_hdcp_comp_master redundant declaration [Chaitanya]
- use %s/foo/bar/ format in commit message to show changes [Chaitanya]

--v3
- replace i915_hdcp_comp_master declaration with i915_hdcp_arbiter
to avoid any compile fail with old compilers [Chaitanya]

Cc: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230529110740.1522985-3-suraj.kandpal@intel.com

mei: Move uuid.h to the MEI namespace

There is only a single user of the UUID uAPI, let's make it
part of that user.

The way it's done is to prevent compilation time breakage for
the user space that does

#include <linux/uuid.h>

In the future MEI user space tools can switch over to use mei_uuid.h.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230310170747.22782-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drm/i915/hdcp: Refactor HDCP API structures

It requires to move intel specific HDCP API structures to
i915_hdcp_interface.h from driver/misc/mei/hdcp/mei_hdcp.h
so that any content protection fw interfaces can use these
structures.

Cc: Tomas Winkler <tomas.winkler@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Uma Shankar <uma.shankar@intel.com>
Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@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/20230316092927.668980-5-suraj.kandpal@intel.com

drm/i915/hdcp: Use generic names for HDCP helpers and structs

pre MTL we interact with mei interface to talk to
firmware and enable CP but going forward we will talk to gsc cs
because of which we are making all names for HDCP helpers and
structures generic as either mei or gsc cs maybe used.

Change the include/drm/i915_mei_hdcp_interface.h to
include/drm/i915_hdcp_interface.h

Change the i915_hdcp_interface.h header naming convention to
suit generic f/w type.
%s/MEI_/HDCP_
%s/mei_dev/hdcp_dev

Change structure name Accordingly.
%s/i915_hdcp_comp_master/i915_hdcp_master
%s/i915_hdcp_component_ops/i915_hdcp_ops

--v6
-make each patch build individually [Jani]

--v8
-change ME FW to ME/GSC FW [Ankit]
-fix formatting issue [Ankit]

--v9
-fix commit message and header [Uma]

--v10
-rename comp variable [Uma]

Cc: Tomas Winkler <tomas.winkler@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Uma Shankar <uma.shankar@intel.com>
Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230316092927.668980-3-suraj.kandpal@intel.com

misc/mei/hdcp: Use correct macros to initialize uuid_le

GUID_INIT() is for internal guid_t type and shouldn't be used
for the uuid_le. I.o.w. relying on the implementation details
is layering violation. Use correct macros to initialize uuid_le.

Fixes: 64e9bbdd9588 ("misc/mei/hdcp: Client driver for HDCP application")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20221228160500.21220-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

misc/mei: Add NULL check to component match callback functions

Currently, component_match callback functions used in mei refers to the
driver name, assuming that the component device being matched has a
driver bound. It can cause a NULL pointer dereference when a device
without a driver bound registers a component. This is due to the nature
of the component framework where all registered components are matched
in any component_match callback functions. So even if a component is
registered by a totally irrelevant device, that component is also
shared to these callbacks for i915 driver.

To prevent totally irrelevant device being matched for i915 and causing
a NULL pointer dereference for checking driver name, add a NULL check on
dev->driver to check if there is a driver bound before checking the
driver name.

In the future, the string compare on the driver name, "i915" may need to
be refactored too.

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Prashant Malani <pmalani@chromium.org>
Signed-off-by: Won Chung <wonchung@google.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

mei: bus: change remove callback to return void

The driver core ignores the return value of mei_cl_device_remove() so
passing an error value doesn't solve any problem. As most mei drivers'
remove callbacks return 0 unconditionally and returning a different value
doesn't have any effect, change this prototype to return void and return 0
unconditionally in mei_cl_device_remove(). The only driver that could
return an error value is modified to emit an explicit warning in the error
case.

Acked-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Link: https://lore.kernel.org/r/20210208073705.428185-3-uwe@kleine-koenig.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

misc/mei/hdcp: Fix AUTH_STREAM_REQ cmd buffer len

Fix the size of WIRED_REPEATER_AUTH_STREAM_REQ cmd buffer size.
It is based upon the actual number of MST streams and size
of wired_cmd_repeater_auth_stream_req_in.
Excluding the size of hdcp_cmd_header.

v2:
- hdcp_cmd_header size annotation nitpick. [Tomas]

Cc: Tomas Winkler <tomas.winkler@intel.com>
Cc: Ramalingam C <ramalingam.c@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Ramalingam C <ramalingam.c@intel.com>
Tested-by: Karthik B S <karthik.b.s@intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210111081120.28417-13-anshuman.gupta@intel.com

mei: hdcp: fix mei_hdcp_verify_mprime() input parameter

wired_cmd_repeater_auth_stream_req_in has a variable
length array at the end. we use struct_size() overflow
macro to determine the size for the allocation and sending
size.
This also fixes bug in case number of streams is > 0 in the original
submission. This bug was not triggered as the number of streams is
always one.

Fixes: c56967d674e3 (mei: hdcp: Replace one-element array with flexible-array member)
Fixes: 0a1af1b5c18d (misc/mei/hdcp: Verify M_prime)
Cc: <stable@vger.kernel.org> # v5.1+: c56967d674e3 (mei: hdcp: Replace one-element array with flexible-array member)
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20200818075406.2532605-1-tomas.winkler@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

mei: hdcp: Replace one-element array with flexible-array member

There is a regular need in the kernel to provide a way to declare
having a dynamically sized set of trailing elements in a structure.
Kernel code should always use “flexible array members”[1] for these
cases. The older style of one-element or zero-length arrays should
no longer be used[2].

Also, make use of the array_size() helper instead of the open-coded
version in memcpy(). These sorts of multiplication factors need to
be wrapped in array_size().

And while there, use the preferred form for passing a size of a struct.
The alternative form where struct name is spelled out hurts readability
and introduces an opportunity for a bug when the pointer variable type is
changed but the corresponding sizeof that is passed as argument is not.

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://github.com/KSPP/linux/issues/79

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20200722181534.GA31357@embeddedor
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

mei: hdcp: Constify struct mei_cl_device_id

mei_hdcp_tbl[] is never modified and can be made const to allow the
compiler to put it in read-only memory.

Before:
text data bss dec hex filename
15844 5416 0 21260 530c drivers/misc/mei/hdcp/mei_hdcp.o

After:
text data bss dec hex filename
16004 5256 0 21260 530c drivers/misc/mei/hdcp/mei_hdcp.o

Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Link: https://lore.kernel.org/r/20200610224704.27082-4-rikard.falkeborn@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

mei: hdcp: bind only with i915 on the same PCH

The mei device and i915 must reside on the same
PCH in order for HDCP to work. Make the component
matching function enforce this requirement.

hdcp
|
i915 mei
| |
+----= PCH =----+

Cc: <stable@vger.kernel.org> v5.0+
Cc: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Alexander Usyskin <alexander.usyskin@intel.com>
Link: https://lore.kernel.org/r/20191212084103.2893-1-tomas.winkler@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

misc/mei/hdcp: Fill transcoder index in port info

For gen12+ platform we need to pass the transcoder info
as part of the port info into ME FW.

This change fills the payload for ME FW from hdcp_port_data.

v2:
Doc is enhanced for physical_port and attached_transcoder [Tomas]

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Shashank Sharma <shashank.sharma@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190828164216.405-5-ramalingam.c@intel.com

drm/i915: mei_hdcp: I915 sends ddi index as per ME FW

I915 converts it's port value into ddi index defiend by ME FW
and pass it as a member of hdcp_port_data structure.

Hence expose the enum mei_fw_ddi to I915 through
i915_mei_interface.h.

v2:
Copyright years are bumped [Tomas]

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Shashank Sharma <shashank.sharma@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190828164216.405-2-ramalingam.c@intel.com

mei: docs: add hdcp documentation

1. Add a short ducumentation for MEI HDCP driver,
and fix DOC comments in drivers/misc/mei/hdcp/mei_hdcp.c

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drm: generic fn converting be24 to cpu and vice versa

Existing functions for converting a 3bytes(be24) of big endian value
into u32 of little endian and vice versa are renamed as

s/drm_hdcp2_seq_num_to_u32/drm_hdcp_be24_to_cpu
s/drm_hdcp2_u32_to_seq_num/drm_hdcp_cpu_to_be24

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Suggested-by: Daniel Vetter <daniel@ffwll.ch>
cc: Tomas Winkler <tomas.winkler@intel.com>
Acked-by: Dave Airlie <airlied@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20190507162745.25600-4-ramalingam.c@intel.com

mei/hdcp: Fix SPDX identifiers

1. Remove redundant parentheses around single license
2. Fix the license to GPL-2.0 and not GPL-2.0+ in mei_hdcp.h

Cc: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

misc/mei/hdcp: Component framework for I915 Interface

Mei hdcp driver is designed as component slave for the I915 component
master.

v2: Rebased.
v3:
Notifier chain is adopted for cldev state update [Tomas]
v4:
Made static dummy functions as inline in mei_hdcp.h
API for polling client device status
IS_ENABLED used in header, for config status for mei_hdcp.
v5:
Replacing the notifier with component framework. [Daniel]
v6:
Rebased on the I915 comp master redesign.
v7:
mei_hdcp_component_registered is made static [Uma]
Need for global static variable mei_cldev is removed.
v8:
master comp is added to be matched with i915 subcomponent [daniel]
v9:
only comp_master is set and retrieved as driver_data [Daniel]
Reviewed-by Daniel.
v10:
small corrections at probe [Tomas]
v11:
bind and unbind logs are made as debug logs [Tomas]
cldev_enable failure is handled [Tomas]

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550772730-23280-16-git-send-email-ramalingam.c@intel.com

misc/mei/hdcp: Closing wired HDCP2.2 Tx Session

Request the ME to terminate the HDCP2.2 session for a port.

On Success, ME FW will mark the intel port as Deauthenticated and
terminate the wired HDCP2.2 Tx session started due to the cmd
WIRED_INITIATE_HDCP2_SESSION.

v2: Rebased.
v3:
cldev is passed as first parameter [Tomas]
Redundant comments and cast are removed [Tomas]
v4:
%zd for ssize_t [Alexander]
%s/return -1/return -EIO [Alexander]
Style and typos fixed [Uma]
v5:
Extra line is removed.
v6:
Collected the Rb-ed by.
Rebased.
v7:
Adjust to the new mei interface.
Fix for Kdoc.
v8:
K-Doc addition.[Tomas]
v9:
renamed func as mei_hdcp_* [Tomas]
Inline function is defined for DDI index [Tomas]
v10:
K-Doc fix. [Tomas]
v11:
Rebased.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550772730-23280-15-git-send-email-ramalingam.c@intel.com

misc/mei/hdcp: Enabling the HDCP authentication

Request to ME to configure a port as authenticated.

On Success, ME FW will mark the port as authenticated and provides
HDCP cipher with the encryption keys.

Enabling the Authentication can be requested once all stages of
HDCP2.2 authentication is completed by interacting with ME FW.

Only after this stage, driver can enable the HDCP encryption for
the port, through HW registers.

v2: Rebased.
v3:
cldev is passed as first parameter [Tomas]
Redundant comments and cast are removed [Tomas]
v4:
%zd for ssize_t [Alexander]
%s/return -1/return -EIO [Alexander]
Style and typos fixed [Uma]
v5: Rebased.
v6:
Collected the Rb-ed by.
Rebased.
v7:
Adjust to the new mei interface.
Fix for Kdoc.
v8:
K-Doc addition. [Tomas]
v9:
renamed func as mei_hdcp_* [Tomas]
Inline function is defined for DDI index [Tomas]
v10:
K-Doc fix. [Tomas]
v11:
Rebased.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550772730-23280-14-git-send-email-ramalingam.c@intel.com

misc/mei/hdcp: Verify M_prime

Request to ME to verify the M_Prime received from the HDCP sink.

ME FW will calculate the M and compare with M_prime received
as part of RepeaterAuth_Stream_Ready, which is HDCP2.2 protocol msg.

On successful completion of this stage, downstream propagation of
the stream management info is completed.

v2: Rebased.
v3:
cldev is passed as first parameter [Tomas]
Redundant comments and cast are removed [Tomas]
v4:
%zd for ssize_t [Alexander]
%s/return -1/return -EIO [Alexander]
endianness conversion func is moved to drm_hdcp.h [Uma]
v5: Rebased.
v6:
Collected the Rb-ed by.
Rebasing.
v7:
Adjust to the new mei interface.
Fix for Kdoc.
v8:
K-Doc addition. [Tomas]
drm_hdcp2_u32_to_seq_num() is used for u32 to seq_num.
v9:
renamed func as mei_hdcp_* [Tomas]
Inline function is defined for DDI index [Tomas]
v10:
K-Doc fix. [Tomas]
v11:
%s/__swab16/cpu_to_be16 [Tomas]

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550772730-23280-13-git-send-email-ramalingam.c@intel.com

misc/mei/hdcp: Repeater topology verification and ack

Request ME to verify the downstream topology information received.

ME FW will validate the Repeaters receiver id list and
downstream topology.

On Success ME FW will provide the Least Significant
128bits of VPrime, which forms the repeater ack.

v2: Rebased.
v3:
cldev is passed as first parameter [Tomas]
Redundant comments and cast are removed [Tomas]
v4:
%zd for ssize_t [Alexander]
%s/return -1/return -EIO [Alexander]
Style and typos fixed [Uma]
v5: Rebased.
v6: Rebasing.
v7:
Adjust to the new mei interface.
Fix for Kdoc.
v8:
K-Doc addition. [Tomas]
v9:
renamed func as mei_hdcp_* [Tomas]
Inline function is defined for DDI index [Tomas]
v10:
K-Doc fix. [Tomas]
v11:
Rebased.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550772730-23280-12-git-send-email-ramalingam.c@intel.com

misc/mei/hdcp: Prepare Session Key

Request to ME to prepare the encrypted session key.

On Success, ME provides Encrypted session key. Function populates
the HDCP2.2 authentication msg SKE_Send_Eks.

v2: Rebased.
v3:
cldev is passed as first parameter [Tomas]
Redundant comments and cast are removed [Tomas]
v4:
%zd for ssize_t [Alexander]
%s/return -1/return -EIO [Alexander]
Style fixed [Uma]
v5: Rebased.
v6:
Collected the Rb-ed by.
Rebasing.
v7:
Adjust to the new mei interface.
Fix for Kdoc.
v8:
K-Doc addition. [Tomas]
v9:
renamed func as mei_hdcp_* [Tomas]
Inline function is defined for DDI index [Tomas]
v10:
K-Doc fix. [Tomas]
v11:
Rebased.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550772730-23280-11-git-send-email-ramalingam.c@intel.com

misc/mei/hdcp: Verify L_prime

Request to ME to verify the LPrime received from HDCP sink.

On Success, ME FW will verify the received Lprime by calculating and
comparing with L.

This represents the completion of Locality Check.

v2: Rebased.
v3:
cldev is passed as first parameter [Tomas]
Redundant comments and cast are removed [Tomas]
v4:
%zd for ssize_t [Alexander]
%s/return -1/return -EIO [Alexander]
Style fixed [Uma]
v5: Rebased.
v6:
Collected the Rb-ed by.
Rebasing.
v7:
Adjust to the new mei interface.
Fix for Kdoc.
v8:
K-Doc addition. [Tomas]
memcpy for const length.
v9:
renamed func as mei_hdcp_* [Tomas]
Inline function is defined for DDI index [Tomas]
v10:
K-Doc fix. [Tomas]
v11:
Rebased.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550772730-23280-10-git-send-email-ramalingam.c@intel.com

misc/mei/hdcp: Initiate Locality check

Requests ME to start the second stage of HDCP2.2 authentication,
called Locality Check.

On Success, ME FW will provide LC_Init message to send to hdcp sink.

v2: Rebased.
v3:
cldev is passed as first parameter [Tomas]
Redundant comments and cast are removed [Tomas]
v4:
%zd used for ssize_t [Alexander]
%s/return -1/return -EIO [Alexander]
Style fixed [Uma]
v5: Rebased.
v6:
Collected the Rb-ed by.
Rebasing.
v7:
Adjust to the new mei interface.
Fix for Kdoc.
v8:
K-Doc addition. [Tomas]
v9:
renamed func as mei_hdcp_* [Tomas]
Inline function is defined for DDI index [Tomas]
v10:
K-Doc fix. [Tomas]
v11:
Rebased.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550772730-23280-9-git-send-email-ramalingam.c@intel.com

misc/mei/hdcp: Store the HDCP Pairing info

Provides Pairing info to ME to store.

Pairing is a process to fast track the subsequent authentication
with the same HDCP sink.

On Success, received HDCP pairing info is stored in non-volatile
memory of ME.

v2: Rebased.
v3:
cldev is passed as first parameter [Tomas]
Redundant comments and cast are removed [Tomas]
v4:
%zd for ssize_t [Alexander]
%s/return -1/return -EIO [Alexander]
Style fixed [Uma]
v5: Rebased.
v6:
Collected the Rb-ed by.
Rebasing.
v7:
Adjust to the new mei interface.
Fix for Kdoc.
v8:
K-Doc addition. [Tomas]
memcpy for const length.
v9:
renamed func as mei_hdcp_* [Tomas]
Inline function is defined for DDI index [Tomas]
v10:
K-Doc fix. [Tomas]
v11:
Rebased.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550772730-23280-8-git-send-email-ramalingam.c@intel.com

misc/mei/hdcp: Verify H_prime

Requests for the verification of AKE_Send_H_prime.

ME will calculate the H and comparing it with received H_Prime.
The result will be returned as status.

Here AKE_Send_H_prime is a HDCP2.2 Authentication msg.

v2: Rebased.
v3:
cldev is passed as first parameter [Tomas]
Redundant comments and cast are removed [Tomas]
v4:
%zd for ssize_t [Alexander]
%s/return -1/return -EIO [Alexander]
Styles and typos fixed [Uma]
v5: Rebased.
v6:
Collected the Rb-ed by.
Rebasing.
v7:
Adjust to the new mei interface.
Fix for Kdoc.
v8:
K-Doc Addition [Tomas]
memcpy for const length.
v9:
renamed func as mei_hdcp_* [Tomas]
Inline function is defined for DDI index [Tomas]
v10:
K-Doc fix. [Tomas]
v11:
Rebased.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550772730-23280-7-git-send-email-ramalingam.c@intel.com

misc/mei/hdcp: Verify Receiver Cert and prepare km

Requests for verification for receiver certification and also the
preparation for next AKE auth message with km.

On Success ME FW validate the HDCP2.2 receivers certificate and do the
revocation check on the receiver ID. AKE_Stored_Km will be prepared if
the receiver is already paired, else AKE_No_Stored_Km will be prepared.

Here AKE_Stored_Km and AKE_No_Stored_Km are HDCP2.2 protocol msgs.

v2: Rebased.
v3:
cldev is passed as first parameter [Tomas]
Redundant comments and cast are removed [Tomas]
v4:
%zd is used for ssize_t [Alexander]
%s/return -1/return -EIO [Alexander]
v5: Rebased.
v6:
Collected the Rb-ed by.
Rebasing.
v7:
Adjust to the new mei interface.
Fix for Kdoc.
v8:
K-Doc Addition. [Tomas]
memcpy for const length.
v9:
renamed func as mei_hdcp_* [Tomas]
Inline function is defined for DDI index [Tomas]
v10:
Fixed the conversion of u8 to bool [Tomas]
K-Doc fix [Tomas]
v11:
Rebased.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550772730-23280-6-git-send-email-ramalingam.c@intel.com

misc/mei/hdcp: Initiate Wired HDCP2.2 Tx Session

Request ME FW to start the HDCP2.2 session for an intel port.
Prepares payloads for command WIRED_INITIATE_HDCP2_SESSION and sends
to ME FW.

On Success, ME FW will start a HDCP2.2 session for the port and
provides the content for HDCP2.2 AKE_Init message.

v2: Rebased.
v3:
cldev is add as a separate parameter [Tomas]
Redundant comment and typecast are removed [Tomas]
v4:
%zd is used for size [Alexander]
%s/return -1/return -EIO [Alexander]
Spellings in commit msg is fixed [Uma]
v5: Rebased.
v6:
Collected the rb-ed by.
Realigning the patches in the series.
v7:
Adjust to the new mei interface.
Fix for kdoc.
v8:
K-Doc Addition.
memcpy for const length.
v9:
s/mei_hdcp_ddi/mei_fw_ddi
s/i915_port/mei_i915_port [Tomas]
renamed func as mei_hdcp_* [Tomas]
Instead of macro, inline func for ddi index is used. [Tomas]
v10:
Switch case for the coversion between i915_port to mei_ddi [Tomas]
Kernel doc fix.
v11:
mei_hdcp_ops is defined as const. [Tomas]

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550772730-23280-5-git-send-email-ramalingam.c@intel.com

misc/mei/hdcp: Client driver for HDCP application

ME FW contributes a vital role in HDCP2.2 authentication.
HDCP2.2 driver needs to communicate to ME FW for each step of the
HDCP2.2 authentication.

ME FW prepare and HDCP2.2 authentication parameters and encrypt them
as per spec. With such parameter Driver prepares HDCP2.2 auth messages
and communicate with HDCP2.2 sink.

Similarly HDCP2.2 sink's response is shared with ME FW for decrypt and
verification.

Once All the steps of HDCP2.2 authentications are complete on driver's
request ME FW will configure the port as authenticated and supply the
HDCP keys to the Gen HW for encryption.

Only after this stage HDCP2.2 driver can start the HDCP2.2 encryption
for a port.

ME FW is interfaced to kernel through MEI Bus Driver. To obtain the
HDCP2.2 services from the ME FW through MEI Bus driver MEI Client
Driver is developed.

v2:
hdcp files are moved to drivers/misc/mei/hdcp/ [Tomas]
v3:
Squashed the Kbuild support [Tomas]
UUID renamed and Module License is modified [Tomas]
drv_data is set to null at remove [Tomas]
v4:
Module name is changed to "MEI HDCP"
I915 Selects the MEI_HDCP
v5:
Remove redundant text from the License header
Fix malformed licence
Removed the drv_data resetting.
v6:
K-Doc addition. [Tomas]
v7:
%s/UUID_LE/GUID_INIT [Tomas]
GPL Ver is 2.0 than 2.0+ [Tomas]
v8:
Added more info into Kconfig addition [Tomas]

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550772730-23280-3-git-send-email-ramalingam.c@intel.com