Re: [PATCH v10 25/40] misc/mei/hdcp: Initiate Wired HDCP2.2 Tx Session

["C, Ramalingam" <ramalingam.c@intel.com>]

On 2/6/2019 3:57 PM, Winkler, Tomas wrote:
>>>> 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.
>>>>
>>>> Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
>>>> Reviewed-by: Uma Shankar <uma.shankar@intel.com>
>>> Latest set look ok. You can keep the RB.
>>>
>>>> ---
>>>> drivers/misc/mei/hdcp/mei_hdcp.c | 82
>>>> ++++++++++++++++++++++++++++++++++++++++
>>>> drivers/misc/mei/hdcp/mei_hdcp.h | 28 ++++++++++++++
>>>> 2 files changed, 110 insertions(+)
>>>>
>>>> diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
>>>> b/drivers/misc/mei/hdcp/mei_hdcp.c
>>>> index ca5010ad7dd7..534d29c8ee86 100644
>>>> --- a/drivers/misc/mei/hdcp/mei_hdcp.c
>>>> +++ b/drivers/misc/mei/hdcp/mei_hdcp.c
>>>> @@ -23,6 +23,88 @@
>>>> #include <linux/slab.h>
>>>> #include <linux/uuid.h>
>>>> #include <linux/mei_cl_bus.h>
>>>> +#include <drm/drm_connector.h>
>>>> +#include <drm/i915_component.h>
>>>> +#include <drm/i915_mei_hdcp_interface.h>
>>>> +
>>>> +#include "mei_hdcp.h"
>>>> +
>>>> +/**
>>>> + * mei_initiate_hdcp2_session() - Initiate a Wired HDCP2.2 Tx
>>>> +Session in ME FW
>>>> + * @dev: device corresponding to the mei_cl_device
>>>> + * @hdcp_data: Intel HW specific hdcp data
>>>> + * @ake_data: AKE_Init msg output.
>>>> + *
>>>> + * Return:  0 on Success, <0 on Failure.
>>>> + */
>>>> +static int
>>>> +mei_initiate_hdcp2_session(struct device *dev, struct hdcp_port_data
>> *data,
>>>> +			   struct hdcp2_ake_init *ake_data) {
>>
>> Breaking naming conventions : all functions should be prefixed with mei_hdcp_
>>
>> e.g. mei_hdcp_ initiate_session()
>>
>>>> +	struct wired_cmd_initiate_hdcp2_session_in session_init_in = { { 0 } };
>>>> +	struct wired_cmd_initiate_hdcp2_session_out
>>>> +						session_init_out = { { 0 } };
>>>> +	struct mei_cl_device *cldev;
>>>> +	ssize_t byte;
>>>> +
>>>> +	if (!dev || !data || !ake_data)
>>>> +		return -EINVAL;
>>>> +
>>>> +	cldev = to_mei_cl_device(dev);
>>>> +
>>>> +	session_init_in.header.api_version = HDCP_API_VERSION;
>>>> +	session_init_in.header.command_id =
>>>> WIRED_INITIATE_HDCP2_SESSION;
>>>> +	session_init_in.header.status = ME_HDCP_STATUS_SUCCESS;
>>>> +	session_init_in.header.buffer_len =
>>>> +
>>>> 	WIRED_CMD_BUF_LEN_INITIATE_HDCP2_SESSION_IN;
>>>> +
>>>> +	session_init_in.port.integrated_port_type = data->port_type;
>>>> +	session_init_in.port.physical_port = (u8)GET_MEI_DDI_INDEX(data-
>>>>> port);
>>>> +	session_init_in.protocol = data->protocol;
>>>> +
>>>> +	byte = mei_cldev_send(cldev, (u8 *)&session_init_in,
>>>> +			      sizeof(session_init_in));
>>>> +	if (byte < 0) {
>>>> +		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
>>>> +		return byte;
>>>> +	}
>>>> +
>>>> +	byte = mei_cldev_recv(cldev, (u8 *)&session_init_out,
>>>> +			      sizeof(session_init_out));
>>>> +	if (byte < 0) {
>>>> +		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
>>>> +		return byte;
>>>> +	}
>>>> +
>>>> +	if (session_init_out.header.status != ME_HDCP_STATUS_SUCCESS) {
>>>> +		dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
>>>> +			WIRED_INITIATE_HDCP2_SESSION,
>>>> +			session_init_out.header.status);
>>>> +		return -EIO;
>>>> +	}
>>>> +
>>>> +	ake_data->msg_id = HDCP_2_2_AKE_INIT;
>>>> +	ake_data->tx_caps = session_init_out.tx_caps;
>>>> +	memcpy(ake_data->r_tx, session_init_out.r_tx, HDCP_2_2_RTX_LEN);
>>>> +
>>>> +	return 0;
>>>> +}
>>>> +
>>>> +static __attribute__((unused))
>>>> +struct i915_hdcp_component_ops mei_hdcp_ops = {
>>>> +	.owner = THIS_MODULE,
>>>> +	.initiate_hdcp2_session = mei_initiate_hdcp2_session,
>>>> +	.verify_receiver_cert_prepare_km = NULL,
>>>> +	.verify_hprime = NULL,
>>>> +	.store_pairing_info = NULL,
>>>> +	.initiate_locality_check = NULL,
>>>> +	.verify_lprime = NULL,
>>>> +	.get_session_key = NULL,
>>>> +	.repeater_check_flow_prepare_ack = NULL,
>>>> +	.verify_mprime = NULL,
>>>> +	.enable_hdcp_authentication = NULL,
>>>> +	.close_hdcp_session = NULL,
>>>> +};
>>>>
>>>> static int mei_hdcp_probe(struct mei_cl_device *cldev,
>>>> 			  const struct mei_cl_device_id *id) diff --git
>>>> a/drivers/misc/mei/hdcp/mei_hdcp.h b/drivers/misc/mei/hdcp/mei_hdcp.h
>>>> index 582a7e27ae29..f831db3cbd54 100644
>>>> --- a/drivers/misc/mei/hdcp/mei_hdcp.h
>>>> +++ b/drivers/misc/mei/hdcp/mei_hdcp.h
>>>> @@ -363,4 +363,32 @@ struct wired_cmd_repeater_auth_stream_req_out
>> {
>>>> 	struct hdcp_port_id	port;
>>>> } __packed;
>>>>
>>>> +enum mei_hdcp_ddi {
>>>> +	MEI_DDI_INVALID_PORT = 0x0,
>>>> +
>>>> +	MEI_DDI_B = 1,
>>>> +	MEI_DDI_C,
>>>> +	MEI_DDI_D,
>>>> +	MEI_DDI_E,
>>>> +	MEI_DDI_F,
>>>> +	MEI_DDI_A = 7,
>>>> +	MEI_DDI_RANGE_END = MEI_DDI_A,
>>>> +};
>>>> +
>>>> +enum i915_port {
>> We've already reviewed. Move to i915 header or use mei_ prefix?
>>>> +	PORT_NONE = -1,
>>>> +
>>>> +	PORT_A = 0,
>>>> +	PORT_B,
>>>> +	PORT_C,
>>>> +	PORT_D,
>>>> +	PORT_E,
>>>> +	PORT_F,
>>>> +	I915_MAX_PORTS,
>>>> +};
>>>> +
>>>> +#define GET_MEI_DDI_INDEX(p) ({
>>>> 	\
>>>> +	enum i915_port __p = (enum i915_port)(p);			\
>>>> +	__p == PORT_A ? MEI_DDI_A : (enum mei_hdcp_ddi)__p;
>>> 	\
>>>> +})
>>>> #endif /* __MEI_HDCP_H__ */
> I wonder why we are casting it to another enum here and they you consistently  casting it to u8 back when assigned.
>
>
> mei_hdcp.c:     session_init_in.port.physical_port = (u8)GET_MEI_DDI_INDEX(data->port);
> mei_hdcp.c:     verify_rxcert_in.port.physical_port = (u8)GET_MEI_DDI_INDEX(data->port);
> mei_hdcp.c:     send_hprime_in.port.physical_port = (u8)GET_MEI_DDI_INDEX(data->port);
> mei_hdcp.c:     pairing_info_in.port.physical_port = (u8)GET_MEI_DDI_INDEX(data->port);
> mei_hdcp.c:     lc_init_in.port.physical_port = (u8)GET_MEI_DDI_INDEX(data->port);
> mei_hdcp.c:     verify_lprime_in.port.physical_port = (u8)GET_MEI_DDI_INDEX(data->port);
> mei_hdcp.c:     get_skey_in.port.physical_port = (u8)GET_MEI_DDI_INDEX(data->port);
> mei_hdcp.c:     verify_mprime_in.port.physical_port = (u8)GET_MEI_DDI_INDEX(data->port);
> mei_hdcp.c:     enable_auth_in.port.physical_port = (u8)GET_MEI_DDI_INDEX(data->port);
> mei_hdcp.c:     session_close_in.port.physical_port = (u8)GET_MEI_DDI_INDEX(data->port);
>
>
> This macro is only used in mei_hdcp.c so I would just make an inline function of it and push it to the c file.
Addressed in v11 which is published already.

Thanks
--Ram.
> Thanks
> Tomas
>

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