1 /* SPDX-License-Identifier: MIT */
2 /*
3  * Copyright(c) 2020, Intel Corporation. All rights reserved.
4  */
5 
6 #ifndef __INTEL_PXP_TYPES_H__
7 #define __INTEL_PXP_TYPES_H__
8 
9 #include <linux/completion.h>
10 #include <linux/mutex.h>
11 #include <linux/types.h>
12 #include <linux/workqueue.h>
13 
14 struct intel_context;
15 struct intel_gt;
16 struct i915_pxp_component;
17 struct drm_i915_private;
18 
19 /**
20  * struct intel_pxp - pxp state
21  */
22 struct intel_pxp {
23 	/**
24 	 * @ctrl_gt: poiner to the tile that owns the controls for PXP subsystem assets that
25 	 * the VDBOX, the KCR engine (and GSC CS depending on the platform)
26 	 */
27 	struct intel_gt *ctrl_gt;
28 
29 	/**
30 	 * @kcr_base: base mmio offset for the KCR engine which is different on legacy platforms
31 	 * vs newer platforms where the KCR is inside the media-tile.
32 	 */
33 	u32 kcr_base;
34 
35 	/**
36 	 * @gsccs_res: resources for request submission for platforms that have a GSC engine.
37 	 */
38 	struct gsccs_session_resources {
39 		u64 host_session_handle; /* used by firmware to link commands to sessions */
40 		struct intel_context *ce; /* context for gsc command submission */
41 
42 		struct i915_vma *pkt_vma; /* GSC FW cmd packet vma */
43 		void *pkt_vaddr;  /* GSC FW cmd packet virt pointer */
44 
45 		struct i915_vma *bb_vma; /* HECI_PKT batch buffer vma */
46 		void *bb_vaddr; /* HECI_PKT batch buffer virt pointer */
47 	} gsccs_res;
48 
49 	/**
50 	 * @pxp_component: i915_pxp_component struct of the bound mei_pxp
51 	 * module. Only set and cleared inside component bind/unbind functions,
52 	 * which are protected by &tee_mutex.
53 	 */
54 	struct i915_pxp_component *pxp_component;
55 
56 	/**
57 	 * @dev_link: Enforce module relationship for power management ordering.
58 	 */
59 	struct device_link *dev_link;
60 	/**
61 	 * @pxp_component_added: track if the pxp component has been added.
62 	 * Set and cleared in tee init and fini functions respectively.
63 	 */
64 	bool pxp_component_added;
65 
66 	/** @ce: kernel-owned context used for PXP operations */
67 	struct intel_context *ce;
68 
69 	/** @arb_mutex: protects arb session start */
70 	struct mutex arb_mutex;
71 	/**
72 	 * @arb_is_valid: tracks arb session status.
73 	 * After a teardown, the arb session can still be in play on the HW
74 	 * even if the keys are gone, so we can't rely on the HW state of the
75 	 * session to know if it's valid and need to track the status in SW.
76 	 */
77 	bool arb_is_valid;
78 
79 	/**
80 	 * @key_instance: tracks which key instance we're on, so we can use it
81 	 * to determine if an object was created using the current key or a
82 	 * previous one.
83 	 */
84 	u32 key_instance;
85 
86 	/** @tee_mutex: protects the tee channel binding and messaging. */
87 	struct mutex tee_mutex;
88 
89 	/** @stream_cmd: LMEM obj used to send stream PXP commands to the GSC */
90 	struct {
91 		struct drm_i915_gem_object *obj; /* contains PXP command memory */
92 		void *vaddr; /* virtual memory for PXP command */
93 	} stream_cmd;
94 
95 	/**
96 	 * @hw_state_invalidated: if the HW perceives an attack on the integrity
97 	 * of the encryption it will invalidate the keys and expect SW to
98 	 * re-initialize the session. We keep track of this state to make sure
99 	 * we only re-start the arb session when required.
100 	 */
101 	bool hw_state_invalidated;
102 
103 	/** @irq_enabled: tracks the status of the kcr irqs */
104 	bool irq_enabled;
105 	/**
106 	 * @termination: tracks the status of a pending termination. Only
107 	 * re-initialized under gt->irq_lock and completed in &session_work.
108 	 */
109 	struct completion termination;
110 
111 	/** @session_work: worker that manages session events. */
112 	struct work_struct session_work;
113 	/** @session_events: pending session events, protected with gt->irq_lock. */
114 	u32 session_events;
115 #define PXP_TERMINATION_REQUEST  BIT(0)
116 #define PXP_TERMINATION_COMPLETE BIT(1)
117 #define PXP_INVAL_REQUIRED       BIT(2)
118 };
119 
120 #endif /* __INTEL_PXP_TYPES_H__ */
121