1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright(c) 2020 Intel Corporation. 4 */ 5 6 #include <linux/component.h> 7 8 #include <drm/i915_pxp_tee_interface.h> 9 #include <drm/i915_component.h> 10 11 #include "i915_drv.h" 12 #include "intel_pxp.h" 13 #include "intel_pxp_session.h" 14 #include "intel_pxp_tee.h" 15 #include "intel_pxp_tee_interface.h" 16 17 static inline struct intel_pxp *i915_dev_to_pxp(struct device *i915_kdev) 18 { 19 struct drm_i915_private *i915 = kdev_to_i915(i915_kdev); 20 21 return &to_gt(i915)->pxp; 22 } 23 24 static int intel_pxp_tee_io_message(struct intel_pxp *pxp, 25 void *msg_in, u32 msg_in_size, 26 void *msg_out, u32 msg_out_max_size, 27 u32 *msg_out_rcv_size) 28 { 29 struct drm_i915_private *i915 = pxp_to_gt(pxp)->i915; 30 struct i915_pxp_component *pxp_component = pxp->pxp_component; 31 int ret = 0; 32 33 mutex_lock(&pxp->tee_mutex); 34 35 /* 36 * The binding of the component is asynchronous from i915 probe, so we 37 * can't be sure it has happened. 38 */ 39 if (!pxp_component) { 40 ret = -ENODEV; 41 goto unlock; 42 } 43 44 ret = pxp_component->ops->send(pxp_component->tee_dev, msg_in, msg_in_size); 45 if (ret) { 46 drm_err(&i915->drm, "Failed to send PXP TEE message\n"); 47 goto unlock; 48 } 49 50 ret = pxp_component->ops->recv(pxp_component->tee_dev, msg_out, msg_out_max_size); 51 if (ret < 0) { 52 drm_err(&i915->drm, "Failed to receive PXP TEE message\n"); 53 goto unlock; 54 } 55 56 if (ret > msg_out_max_size) { 57 drm_err(&i915->drm, 58 "Failed to receive PXP TEE message due to unexpected output size\n"); 59 ret = -ENOSPC; 60 goto unlock; 61 } 62 63 if (msg_out_rcv_size) 64 *msg_out_rcv_size = ret; 65 66 ret = 0; 67 unlock: 68 mutex_unlock(&pxp->tee_mutex); 69 return ret; 70 } 71 72 /** 73 * i915_pxp_tee_component_bind - bind function to pass the function pointers to pxp_tee 74 * @i915_kdev: pointer to i915 kernel device 75 * @tee_kdev: pointer to tee kernel device 76 * @data: pointer to pxp_tee_master containing the function pointers 77 * 78 * This bind function is called during the system boot or resume from system sleep. 79 * 80 * Return: return 0 if successful. 81 */ 82 static int i915_pxp_tee_component_bind(struct device *i915_kdev, 83 struct device *tee_kdev, void *data) 84 { 85 struct drm_i915_private *i915 = kdev_to_i915(i915_kdev); 86 struct intel_pxp *pxp = i915_dev_to_pxp(i915_kdev); 87 intel_wakeref_t wakeref; 88 89 mutex_lock(&pxp->tee_mutex); 90 pxp->pxp_component = data; 91 pxp->pxp_component->tee_dev = tee_kdev; 92 mutex_unlock(&pxp->tee_mutex); 93 94 /* if we are suspended, the HW will be re-initialized on resume */ 95 wakeref = intel_runtime_pm_get_if_in_use(&i915->runtime_pm); 96 if (!wakeref) 97 return 0; 98 99 /* the component is required to fully start the PXP HW */ 100 intel_pxp_init_hw(pxp); 101 102 intel_runtime_pm_put(&i915->runtime_pm, wakeref); 103 104 return 0; 105 } 106 107 static void i915_pxp_tee_component_unbind(struct device *i915_kdev, 108 struct device *tee_kdev, void *data) 109 { 110 struct drm_i915_private *i915 = kdev_to_i915(i915_kdev); 111 struct intel_pxp *pxp = i915_dev_to_pxp(i915_kdev); 112 intel_wakeref_t wakeref; 113 114 with_intel_runtime_pm_if_in_use(&i915->runtime_pm, wakeref) 115 intel_pxp_fini_hw(pxp); 116 117 mutex_lock(&pxp->tee_mutex); 118 pxp->pxp_component = NULL; 119 mutex_unlock(&pxp->tee_mutex); 120 } 121 122 static const struct component_ops i915_pxp_tee_component_ops = { 123 .bind = i915_pxp_tee_component_bind, 124 .unbind = i915_pxp_tee_component_unbind, 125 }; 126 127 int intel_pxp_tee_component_init(struct intel_pxp *pxp) 128 { 129 int ret; 130 struct intel_gt *gt = pxp_to_gt(pxp); 131 struct drm_i915_private *i915 = gt->i915; 132 133 ret = component_add_typed(i915->drm.dev, &i915_pxp_tee_component_ops, 134 I915_COMPONENT_PXP); 135 if (ret < 0) { 136 drm_err(&i915->drm, "Failed to add PXP component (%d)\n", ret); 137 return ret; 138 } 139 140 pxp->pxp_component_added = true; 141 142 return 0; 143 } 144 145 void intel_pxp_tee_component_fini(struct intel_pxp *pxp) 146 { 147 struct drm_i915_private *i915 = pxp_to_gt(pxp)->i915; 148 149 if (!pxp->pxp_component_added) 150 return; 151 152 component_del(i915->drm.dev, &i915_pxp_tee_component_ops); 153 pxp->pxp_component_added = false; 154 } 155 156 int intel_pxp_tee_cmd_create_arb_session(struct intel_pxp *pxp, 157 int arb_session_id) 158 { 159 struct drm_i915_private *i915 = pxp_to_gt(pxp)->i915; 160 struct pxp_tee_create_arb_in msg_in = {0}; 161 struct pxp_tee_create_arb_out msg_out = {0}; 162 int ret; 163 164 msg_in.header.api_version = PXP_TEE_APIVER; 165 msg_in.header.command_id = PXP_TEE_ARB_CMDID; 166 msg_in.header.buffer_len = sizeof(msg_in) - sizeof(msg_in.header); 167 msg_in.protection_mode = PXP_TEE_ARB_PROTECTION_MODE; 168 msg_in.session_id = arb_session_id; 169 170 ret = intel_pxp_tee_io_message(pxp, 171 &msg_in, sizeof(msg_in), 172 &msg_out, sizeof(msg_out), 173 NULL); 174 175 if (ret) 176 drm_err(&i915->drm, "Failed to send tee msg ret=[%d]\n", ret); 177 178 return ret; 179 } 180