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 i915_pxp_component; 16 17 /** 18 * struct intel_pxp - pxp state 19 */ 20 struct intel_pxp { 21 /** 22 * @pxp_component: i915_pxp_component struct of the bound mei_pxp 23 * module. Only set and cleared inside component bind/unbind functions, 24 * which are protected by &tee_mutex. 25 */ 26 struct i915_pxp_component *pxp_component; 27 /** 28 * @pxp_component_added: track if the pxp component has been added. 29 * Set and cleared in tee init and fini functions respectively. 30 */ 31 bool pxp_component_added; 32 33 /** @ce: kernel-owned context used for PXP operations */ 34 struct intel_context *ce; 35 36 /** @arb_mutex: protects arb session start */ 37 struct mutex arb_mutex; 38 /** 39 * @arb_is_valid: tracks arb session status. 40 * After a teardown, the arb session can still be in play on the HW 41 * even if the keys are gone, so we can't rely on the HW state of the 42 * session to know if it's valid and need to track the status in SW. 43 */ 44 bool arb_is_valid; 45 46 /** 47 * @key_instance: tracks which key instance we're on, so we can use it 48 * to determine if an object was created using the current key or a 49 * previous one. 50 */ 51 u32 key_instance; 52 53 /** @tee_mutex: protects the tee channel binding and messaging. */ 54 struct mutex tee_mutex; 55 56 /** 57 * @hw_state_invalidated: if the HW perceives an attack on the integrity 58 * of the encryption it will invalidate the keys and expect SW to 59 * re-initialize the session. We keep track of this state to make sure 60 * we only re-start the arb session when required. 61 */ 62 bool hw_state_invalidated; 63 64 /** @irq_enabled: tracks the status of the kcr irqs */ 65 bool irq_enabled; 66 /** 67 * @termination: tracks the status of a pending termination. Only 68 * re-initialized under gt->irq_lock and completed in &session_work. 69 */ 70 struct completion termination; 71 72 /** @session_work: worker that manages session events. */ 73 struct work_struct session_work; 74 /** @session_events: pending session events, protected with gt->irq_lock. */ 75 u32 session_events; 76 #define PXP_TERMINATION_REQUEST BIT(0) 77 #define PXP_TERMINATION_COMPLETE BIT(1) 78 #define PXP_INVAL_REQUIRED BIT(2) 79 }; 80 81 #endif /* __INTEL_PXP_TYPES_H__ */ 82