1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright © 2020 - 2021 Intel Corporation
14 #include <linux/delay.h>
45  * mei_pxp_send_message() - Sends a PXP message to ME FW.
52  *         -ENODEV: Client was not connected.
54  *         -ENOMEM: Internal memory allocation failure experienced.
56  *         -EINTR : Calling thread received a signal. Caller may choose
58  *         -ETIME : Request is timed out.
69 		return -EINVAL;  in mei_pxp_send_message()
77 		case -ENOMEM:  in mei_pxp_send_message()
79 		case -ENODEV:  in mei_pxp_send_message()
81 		case -ETIME:  in mei_pxp_send_message()
94  * mei_pxp_receive_message() - Receives a PXP message from ME FW.
101  *         -ENODEV: Client was not connected.
103  *         -ENOMEM: Internal memory allocation failure experienced.
105  *         -EINTR : Calling thread received a signal. Caller will need to repeat calling
108  *         -ETIME : Request is timed out.
116 	bool retry = false;  in mei_pxp_receive_message()  local
120 		return -EINVAL;  in mei_pxp_receive_message()
124 retry:  in mei_pxp_receive_message()
129 		case -ENOMEM:  in mei_pxp_receive_message()
130 			/* Retry the read when pages are reclaimed */  in mei_pxp_receive_message()
132 			if (!retry) {  in mei_pxp_receive_message()
133 				retry = true;  in mei_pxp_receive_message()
134 				goto retry;  in mei_pxp_receive_message()
137 		case -ENODEV:  in mei_pxp_receive_message()
139 		case -ETIME:  in mei_pxp_receive_message()
151  * mei_pxp_gsc_command() - sends a gsc command, by sending
187 	comp_master->ops = &mei_pxp_ops;  in mei_component_master_bind()
188 	comp_master->tee_dev = dev;  in mei_component_master_bind()
210  * mei_pxp_component_match - compare function for matching mei pxp.
221  * * 1 - if components match
222  * * 0 - otherwise
232 	if (!dev->driver || strcmp(dev->driver->name, "i915") ||  in mei_pxp_component_match()
236 	base = base->parent;  in mei_pxp_component_match()
240 	base = base->parent; /* pci device */  in mei_pxp_component_match()
246 	dev = dev->parent;  in mei_pxp_component_match()
259 		dev_err(&cldev->dev, "mei_cldev_enable Failed. %d\n", ret);  in mei_pxp_probe()
265 		ret = -ENOMEM;  in mei_pxp_probe()
270 	component_match_add_typed(&cldev->dev, &master_match,  in mei_pxp_probe()
271 				  mei_pxp_component_match, &cldev->dev);  in mei_pxp_probe()
273 		ret = -ENOMEM;  in mei_pxp_probe()
278 	ret = component_master_add_with_match(&cldev->dev,  in mei_pxp_probe()
282 		dev_err(&cldev->dev, "Master comp add failed %d\n", ret);  in mei_pxp_probe()
301 	component_master_del(&cldev->dev, &mei_component_master_ops);  in mei_pxp_remove()
307 		dev_warn(&cldev->dev, "mei_cldev_disable() failed\n");  in mei_pxp_remove()
310 /* fbf6fcf1-96cf-4e2e-a6a6-1bab8cbe36b1 : PAVP GUID*/