Commit c7289125 authored by Vitaly Lubart's avatar Vitaly Lubart Committed by Daniele Ceraolo Spurio
Browse files

mei: pxp: add command streamer API to the PXP driver 



The discrete graphics card with GSC firmware
using command streamer API hence it requires to enhance
pxp module with the new gsc_command() handler.

The handler is implemented via mei_pxp_gsc_command() which is
just a thin wrapper around mei_cldev_send_gsc_command()

Signed-off-by: default avatarVitaly Lubart <vitaly.lubart@intel.com>
Signed-off-by: default avatarTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: default avatarDaniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: default avatarAlan Previn <alan.previn.teres.alexis@intel.com>
Reviewed-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220928004145.745803-6-daniele.ceraolospurio@intel.com
parent 2266e58a

drivers/misc/mei/pxp/mei_pxp.c

+25 −0
Original line number Diff line number Diff line
@@ -77,10 +77,35 @@ mei_pxp_receive_message(struct device *dev, void *buffer, size_t size) 
	return byte;

}



/**

 * mei_pxp_gsc_command() - sends a gsc command, by sending

 * a sgl mei message to gsc and receiving reply from gsc

 *

 * @dev: device corresponding to the mei_cl_device

 * @client_id: client id to send the command to

 * @fence_id: fence id to send the command to

 * @sg_in: scatter gather list containing addresses for rx message buffer

 * @total_in_len: total length of data in 'in' sg, can be less than the sum of buffers sizes

 * @sg_out: scatter gather list containing addresses for tx message buffer

 *

 * Return: bytes sent on Success, <0 on Failure

 */

static ssize_t mei_pxp_gsc_command(struct device *dev, u8 client_id, u32 fence_id,

				   struct scatterlist *sg_in, size_t total_in_len,

				   struct scatterlist *sg_out)

{

	struct mei_cl_device *cldev;



	cldev = to_mei_cl_device(dev);



	return mei_cldev_send_gsc_command(cldev, client_id, fence_id, sg_in, total_in_len, sg_out);

}



static const struct i915_pxp_component_ops mei_pxp_ops = {

	.owner = THIS_MODULE,

	.send = mei_pxp_send_message,

	.recv = mei_pxp_receive_message,

	.gsc_command = mei_pxp_gsc_command,

};



static int mei_component_master_bind(struct device *dev)

include/drm/i915_pxp_tee_interface.h

+5 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 


#include <linux/mutex.h>

#include <linux/device.h>

struct scatterlist;



/**

 * struct i915_pxp_component_ops - ops for PXP services.
@@ -23,6 +24,10 @@ struct i915_pxp_component_ops { 


	int (*send)(struct device *dev, const void *message, size_t size);

	int (*recv)(struct device *dev, void *buffer, size_t size);

	ssize_t (*gsc_command)(struct device *dev, u8 client_id, u32 fence_id,

			       struct scatterlist *sg_in, size_t total_in_len,

			       struct scatterlist *sg_out);



};



/**