1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright 2023, Intel Corporation. 4 */ 5 6 #include <drm/drm_print.h> 7 #include <drm/intel/i915_hdcp_interface.h> 8 #include <linux/delay.h> 9 10 #include "abi/gsc_command_header_abi.h" 11 #include "intel_hdcp_gsc.h" 12 #include "intel_hdcp_gsc_message.h" 13 #include "xe_bo.h" 14 #include "xe_device.h" 15 #include "xe_device_types.h" 16 #include "xe_force_wake.h" 17 #include "xe_gsc_proxy.h" 18 #include "xe_gsc_submit.h" 19 #include "xe_map.h" 20 #include "xe_pm.h" 21 #include "xe_uc_fw.h" 22 23 #define HECI_MEADDRESS_HDCP 18 24 25 struct intel_hdcp_gsc_message { 26 struct xe_bo *hdcp_bo; 27 u64 hdcp_cmd_in; 28 u64 hdcp_cmd_out; 29 }; 30 31 #define HDCP_GSC_HEADER_SIZE sizeof(struct intel_gsc_mtl_header) 32 33 bool intel_hdcp_gsc_cs_required(struct xe_device *xe) 34 { 35 return DISPLAY_VER(xe) >= 14; 36 } 37 38 bool intel_hdcp_gsc_check_status(struct xe_device *xe) 39 { 40 struct xe_tile *tile = xe_device_get_root_tile(xe); 41 struct xe_gt *gt = tile->media_gt; 42 struct xe_gsc *gsc = >->uc.gsc; 43 bool ret = true; 44 45 if (!gsc && !xe_uc_fw_is_enabled(&gsc->fw)) { 46 drm_dbg_kms(&xe->drm, 47 "GSC Components not ready for HDCP2.x\n"); 48 return false; 49 } 50 51 xe_pm_runtime_get(xe); 52 if (xe_force_wake_get(gt_to_fw(gt), XE_FW_GSC)) { 53 drm_dbg_kms(&xe->drm, 54 "failed to get forcewake to check proxy status\n"); 55 ret = false; 56 goto out; 57 } 58 59 if (!xe_gsc_proxy_init_done(gsc)) 60 ret = false; 61 62 xe_force_wake_put(gt_to_fw(gt), XE_FW_GSC); 63 out: 64 xe_pm_runtime_put(xe); 65 return ret; 66 } 67 68 /*This function helps allocate memory for the command that we will send to gsc cs */ 69 static int intel_hdcp_gsc_initialize_message(struct xe_device *xe, 70 struct intel_hdcp_gsc_message *hdcp_message) 71 { 72 struct xe_bo *bo = NULL; 73 u64 cmd_in, cmd_out; 74 int ret = 0; 75 76 /* allocate object of two page for HDCP command memory and store it */ 77 bo = xe_bo_create_pin_map(xe, xe_device_get_root_tile(xe), NULL, PAGE_SIZE * 2, 78 ttm_bo_type_kernel, 79 XE_BO_FLAG_SYSTEM | 80 XE_BO_FLAG_GGTT); 81 82 if (IS_ERR(bo)) { 83 drm_err(&xe->drm, "Failed to allocate bo for HDCP streaming command!\n"); 84 ret = PTR_ERR(bo); 85 goto out; 86 } 87 88 cmd_in = xe_bo_ggtt_addr(bo); 89 cmd_out = cmd_in + PAGE_SIZE; 90 xe_map_memset(xe, &bo->vmap, 0, 0, bo->size); 91 92 hdcp_message->hdcp_bo = bo; 93 hdcp_message->hdcp_cmd_in = cmd_in; 94 hdcp_message->hdcp_cmd_out = cmd_out; 95 out: 96 return ret; 97 } 98 99 static int intel_hdcp_gsc_hdcp2_init(struct xe_device *xe) 100 { 101 struct intel_hdcp_gsc_message *hdcp_message; 102 int ret; 103 104 hdcp_message = kzalloc(sizeof(*hdcp_message), GFP_KERNEL); 105 106 if (!hdcp_message) 107 return -ENOMEM; 108 109 /* 110 * NOTE: No need to lock the comp mutex here as it is already 111 * going to be taken before this function called 112 */ 113 ret = intel_hdcp_gsc_initialize_message(xe, hdcp_message); 114 if (ret) { 115 drm_err(&xe->drm, "Could not initialize hdcp_message\n"); 116 kfree(hdcp_message); 117 return ret; 118 } 119 120 xe->display.hdcp.hdcp_message = hdcp_message; 121 return ret; 122 } 123 124 static const struct i915_hdcp_ops gsc_hdcp_ops = { 125 .initiate_hdcp2_session = intel_hdcp_gsc_initiate_session, 126 .verify_receiver_cert_prepare_km = 127 intel_hdcp_gsc_verify_receiver_cert_prepare_km, 128 .verify_hprime = intel_hdcp_gsc_verify_hprime, 129 .store_pairing_info = intel_hdcp_gsc_store_pairing_info, 130 .initiate_locality_check = intel_hdcp_gsc_initiate_locality_check, 131 .verify_lprime = intel_hdcp_gsc_verify_lprime, 132 .get_session_key = intel_hdcp_gsc_get_session_key, 133 .repeater_check_flow_prepare_ack = 134 intel_hdcp_gsc_repeater_check_flow_prepare_ack, 135 .verify_mprime = intel_hdcp_gsc_verify_mprime, 136 .enable_hdcp_authentication = intel_hdcp_gsc_enable_authentication, 137 .close_hdcp_session = intel_hdcp_gsc_close_session, 138 }; 139 140 int intel_hdcp_gsc_init(struct xe_device *xe) 141 { 142 struct i915_hdcp_arbiter *data; 143 int ret; 144 145 data = kzalloc(sizeof(*data), GFP_KERNEL); 146 if (!data) 147 return -ENOMEM; 148 149 mutex_lock(&xe->display.hdcp.hdcp_mutex); 150 xe->display.hdcp.arbiter = data; 151 xe->display.hdcp.arbiter->hdcp_dev = xe->drm.dev; 152 xe->display.hdcp.arbiter->ops = &gsc_hdcp_ops; 153 ret = intel_hdcp_gsc_hdcp2_init(xe); 154 if (ret) 155 kfree(data); 156 157 mutex_unlock(&xe->display.hdcp.hdcp_mutex); 158 159 return ret; 160 } 161 162 void intel_hdcp_gsc_fini(struct xe_device *xe) 163 { 164 struct intel_hdcp_gsc_message *hdcp_message = 165 xe->display.hdcp.hdcp_message; 166 struct i915_hdcp_arbiter *arb = xe->display.hdcp.arbiter; 167 168 if (hdcp_message) { 169 xe_bo_unpin_map_no_vm(hdcp_message->hdcp_bo); 170 kfree(hdcp_message); 171 xe->display.hdcp.hdcp_message = NULL; 172 } 173 174 kfree(arb); 175 xe->display.hdcp.arbiter = NULL; 176 } 177 178 static int xe_gsc_send_sync(struct xe_device *xe, 179 struct intel_hdcp_gsc_message *hdcp_message, 180 u32 msg_size_in, u32 msg_size_out, 181 u32 addr_out_off) 182 { 183 struct xe_gt *gt = hdcp_message->hdcp_bo->tile->media_gt; 184 struct iosys_map *map = &hdcp_message->hdcp_bo->vmap; 185 struct xe_gsc *gsc = >->uc.gsc; 186 int ret; 187 188 ret = xe_gsc_pkt_submit_kernel(gsc, hdcp_message->hdcp_cmd_in, msg_size_in, 189 hdcp_message->hdcp_cmd_out, msg_size_out); 190 if (ret) { 191 drm_err(&xe->drm, "failed to send gsc HDCP msg (%d)\n", ret); 192 return ret; 193 } 194 195 if (xe_gsc_check_and_update_pending(xe, map, 0, map, addr_out_off)) 196 return -EAGAIN; 197 198 ret = xe_gsc_read_out_header(xe, map, addr_out_off, 199 sizeof(struct hdcp_cmd_header), NULL); 200 201 return ret; 202 } 203 204 ssize_t intel_hdcp_gsc_msg_send(struct xe_device *xe, u8 *msg_in, 205 size_t msg_in_len, u8 *msg_out, 206 size_t msg_out_len) 207 { 208 const size_t max_msg_size = PAGE_SIZE - HDCP_GSC_HEADER_SIZE; 209 struct intel_hdcp_gsc_message *hdcp_message; 210 u64 host_session_id; 211 u32 msg_size_in, msg_size_out; 212 u32 addr_out_off, addr_in_wr_off = 0; 213 int ret, tries = 0; 214 215 if (msg_in_len > max_msg_size || msg_out_len > max_msg_size) { 216 ret = -ENOSPC; 217 goto out; 218 } 219 220 msg_size_in = msg_in_len + HDCP_GSC_HEADER_SIZE; 221 msg_size_out = msg_out_len + HDCP_GSC_HEADER_SIZE; 222 hdcp_message = xe->display.hdcp.hdcp_message; 223 addr_out_off = PAGE_SIZE; 224 225 host_session_id = xe_gsc_create_host_session_id(); 226 xe_pm_runtime_get_noresume(xe); 227 addr_in_wr_off = xe_gsc_emit_header(xe, &hdcp_message->hdcp_bo->vmap, 228 addr_in_wr_off, HECI_MEADDRESS_HDCP, 229 host_session_id, msg_in_len); 230 xe_map_memcpy_to(xe, &hdcp_message->hdcp_bo->vmap, addr_in_wr_off, 231 msg_in, msg_in_len); 232 /* 233 * Keep sending request in case the pending bit is set no need to add 234 * message handle as we are using same address hence loc. of header is 235 * same and it will contain the message handle. we will send the message 236 * 20 times each message 50 ms apart 237 */ 238 do { 239 ret = xe_gsc_send_sync(xe, hdcp_message, msg_size_in, msg_size_out, 240 addr_out_off); 241 242 /* Only try again if gsc says so */ 243 if (ret != -EAGAIN) 244 break; 245 246 msleep(50); 247 248 } while (++tries < 20); 249 250 if (ret) 251 goto out; 252 253 xe_map_memcpy_from(xe, msg_out, &hdcp_message->hdcp_bo->vmap, 254 addr_out_off + HDCP_GSC_HEADER_SIZE, 255 msg_out_len); 256 257 out: 258 xe_pm_runtime_put(xe); 259 return ret; 260 } 261