1 /* 2 * Copyright © 2014 Red Hat. 3 * 4 * Permission to use, copy, modify, distribute, and sell this software and its 5 * documentation for any purpose is hereby granted without fee, provided that 6 * the above copyright notice appear in all copies and that both that copyright 7 * notice and this permission notice appear in supporting documentation, and 8 * that the name of the copyright holders not be used in advertising or 9 * publicity pertaining to distribution of the software without specific, 10 * written prior permission. The copyright holders make no representations 11 * about the suitability of this software for any purpose. It is provided "as 12 * is" without express or implied warranty. 13 * 14 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO 16 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR 17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, 18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER 19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 20 * OF THIS SOFTWARE. 21 */ 22 #ifndef _DRM_DP_MST_HELPER_H_ 23 #define _DRM_DP_MST_HELPER_H_ 24 25 #include <linux/types.h> 26 #include <drm/display/drm_dp_helper.h> 27 #include <drm/drm_atomic.h> 28 29 #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) 30 #include <linux/stackdepot.h> 31 #include <linux/timekeeping.h> 32 33 enum drm_dp_mst_topology_ref_type { 34 DRM_DP_MST_TOPOLOGY_REF_GET, 35 DRM_DP_MST_TOPOLOGY_REF_PUT, 36 }; 37 38 struct drm_dp_mst_topology_ref_history { 39 struct drm_dp_mst_topology_ref_entry { 40 enum drm_dp_mst_topology_ref_type type; 41 int count; 42 ktime_t ts_nsec; 43 depot_stack_handle_t backtrace; 44 } *entries; 45 int len; 46 }; 47 #endif /* IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) */ 48 49 struct drm_dp_mst_branch; 50 51 /** 52 * struct drm_dp_vcpi - Virtual Channel Payload Identifier 53 * @vcpi: Virtual channel ID. 54 * @pbn: Payload Bandwidth Number for this channel 55 * @aligned_pbn: PBN aligned with slot size 56 * @num_slots: number of slots for this PBN 57 */ 58 struct drm_dp_vcpi { 59 int vcpi; 60 int pbn; 61 int aligned_pbn; 62 int num_slots; 63 }; 64 65 /** 66 * struct drm_dp_mst_port - MST port 67 * @port_num: port number 68 * @input: if this port is an input port. Protected by 69 * &drm_dp_mst_topology_mgr.base.lock. 70 * @mcs: message capability status - DP 1.2 spec. Protected by 71 * &drm_dp_mst_topology_mgr.base.lock. 72 * @ddps: DisplayPort Device Plug Status - DP 1.2. Protected by 73 * &drm_dp_mst_topology_mgr.base.lock. 74 * @pdt: Peer Device Type. Protected by 75 * &drm_dp_mst_topology_mgr.base.lock. 76 * @ldps: Legacy Device Plug Status. Protected by 77 * &drm_dp_mst_topology_mgr.base.lock. 78 * @dpcd_rev: DPCD revision of device on this port. Protected by 79 * &drm_dp_mst_topology_mgr.base.lock. 80 * @num_sdp_streams: Number of simultaneous streams. Protected by 81 * &drm_dp_mst_topology_mgr.base.lock. 82 * @num_sdp_stream_sinks: Number of stream sinks. Protected by 83 * &drm_dp_mst_topology_mgr.base.lock. 84 * @full_pbn: Max possible bandwidth for this port. Protected by 85 * &drm_dp_mst_topology_mgr.base.lock. 86 * @next: link to next port on this branch device 87 * @aux: i2c aux transport to talk to device connected to this port, protected 88 * by &drm_dp_mst_topology_mgr.base.lock. 89 * @parent: branch device parent of this port 90 * @vcpi: Virtual Channel Payload info for this port. 91 * @connector: DRM connector this port is connected to. Protected by 92 * &drm_dp_mst_topology_mgr.base.lock. 93 * @mgr: topology manager this port lives under. 94 * 95 * This structure represents an MST port endpoint on a device somewhere 96 * in the MST topology. 97 */ 98 struct drm_dp_mst_port { 99 /** 100 * @topology_kref: refcount for this port's lifetime in the topology, 101 * only the DP MST helpers should need to touch this 102 */ 103 struct kref topology_kref; 104 105 /** 106 * @malloc_kref: refcount for the memory allocation containing this 107 * structure. See drm_dp_mst_get_port_malloc() and 108 * drm_dp_mst_put_port_malloc(). 109 */ 110 struct kref malloc_kref; 111 112 #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) 113 /** 114 * @topology_ref_history: A history of each topology 115 * reference/dereference. See CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS. 116 */ 117 struct drm_dp_mst_topology_ref_history topology_ref_history; 118 #endif 119 120 u8 port_num; 121 bool input; 122 bool mcs; 123 bool ddps; 124 u8 pdt; 125 bool ldps; 126 u8 dpcd_rev; 127 u8 num_sdp_streams; 128 u8 num_sdp_stream_sinks; 129 uint16_t full_pbn; 130 struct list_head next; 131 /** 132 * @mstb: the branch device connected to this port, if there is one. 133 * This should be considered protected for reading by 134 * &drm_dp_mst_topology_mgr.lock. There are two exceptions to this: 135 * &drm_dp_mst_topology_mgr.up_req_work and 136 * &drm_dp_mst_topology_mgr.work, which do not grab 137 * &drm_dp_mst_topology_mgr.lock during reads but are the only 138 * updaters of this list and are protected from writing concurrently 139 * by &drm_dp_mst_topology_mgr.probe_lock. 140 */ 141 struct drm_dp_mst_branch *mstb; 142 struct drm_dp_aux aux; /* i2c bus for this port? */ 143 struct drm_dp_mst_branch *parent; 144 145 struct drm_dp_vcpi vcpi; 146 struct drm_connector *connector; 147 struct drm_dp_mst_topology_mgr *mgr; 148 149 /** 150 * @cached_edid: for DP logical ports - make tiling work by ensuring 151 * that the EDID for all connectors is read immediately. 152 */ 153 struct edid *cached_edid; 154 /** 155 * @has_audio: Tracks whether the sink connector to this port is 156 * audio-capable. 157 */ 158 bool has_audio; 159 160 /** 161 * @fec_capable: bool indicating if FEC can be supported up to that 162 * point in the MST topology. 163 */ 164 bool fec_capable; 165 }; 166 167 /* sideband msg header - not bit struct */ 168 struct drm_dp_sideband_msg_hdr { 169 u8 lct; 170 u8 lcr; 171 u8 rad[8]; 172 bool broadcast; 173 bool path_msg; 174 u8 msg_len; 175 bool somt; 176 bool eomt; 177 bool seqno; 178 }; 179 180 struct drm_dp_sideband_msg_rx { 181 u8 chunk[48]; 182 u8 msg[256]; 183 u8 curchunk_len; 184 u8 curchunk_idx; /* chunk we are parsing now */ 185 u8 curchunk_hdrlen; 186 u8 curlen; /* total length of the msg */ 187 bool have_somt; 188 bool have_eomt; 189 struct drm_dp_sideband_msg_hdr initial_hdr; 190 }; 191 192 /** 193 * struct drm_dp_mst_branch - MST branch device. 194 * @rad: Relative Address to talk to this branch device. 195 * @lct: Link count total to talk to this branch device. 196 * @num_ports: number of ports on the branch. 197 * @port_parent: pointer to the port parent, NULL if toplevel. 198 * @mgr: topology manager for this branch device. 199 * @link_address_sent: if a link address message has been sent to this device yet. 200 * @guid: guid for DP 1.2 branch device. port under this branch can be 201 * identified by port #. 202 * 203 * This structure represents an MST branch device, there is one 204 * primary branch device at the root, along with any other branches connected 205 * to downstream port of parent branches. 206 */ 207 struct drm_dp_mst_branch { 208 /** 209 * @topology_kref: refcount for this branch device's lifetime in the 210 * topology, only the DP MST helpers should need to touch this 211 */ 212 struct kref topology_kref; 213 214 /** 215 * @malloc_kref: refcount for the memory allocation containing this 216 * structure. See drm_dp_mst_get_mstb_malloc() and 217 * drm_dp_mst_put_mstb_malloc(). 218 */ 219 struct kref malloc_kref; 220 221 #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) 222 /** 223 * @topology_ref_history: A history of each topology 224 * reference/dereference. See CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS. 225 */ 226 struct drm_dp_mst_topology_ref_history topology_ref_history; 227 #endif 228 229 /** 230 * @destroy_next: linked-list entry used by 231 * drm_dp_delayed_destroy_work() 232 */ 233 struct list_head destroy_next; 234 235 u8 rad[8]; 236 u8 lct; 237 int num_ports; 238 239 /** 240 * @ports: the list of ports on this branch device. This should be 241 * considered protected for reading by &drm_dp_mst_topology_mgr.lock. 242 * There are two exceptions to this: 243 * &drm_dp_mst_topology_mgr.up_req_work and 244 * &drm_dp_mst_topology_mgr.work, which do not grab 245 * &drm_dp_mst_topology_mgr.lock during reads but are the only 246 * updaters of this list and are protected from updating the list 247 * concurrently by @drm_dp_mst_topology_mgr.probe_lock 248 */ 249 struct list_head ports; 250 251 struct drm_dp_mst_port *port_parent; 252 struct drm_dp_mst_topology_mgr *mgr; 253 254 bool link_address_sent; 255 256 /* global unique identifier to identify branch devices */ 257 u8 guid[16]; 258 }; 259 260 261 struct drm_dp_nak_reply { 262 u8 guid[16]; 263 u8 reason; 264 u8 nak_data; 265 }; 266 267 struct drm_dp_link_address_ack_reply { 268 u8 guid[16]; 269 u8 nports; 270 struct drm_dp_link_addr_reply_port { 271 bool input_port; 272 u8 peer_device_type; 273 u8 port_number; 274 bool mcs; 275 bool ddps; 276 bool legacy_device_plug_status; 277 u8 dpcd_revision; 278 u8 peer_guid[16]; 279 u8 num_sdp_streams; 280 u8 num_sdp_stream_sinks; 281 } ports[16]; 282 }; 283 284 struct drm_dp_remote_dpcd_read_ack_reply { 285 u8 port_number; 286 u8 num_bytes; 287 u8 bytes[255]; 288 }; 289 290 struct drm_dp_remote_dpcd_write_ack_reply { 291 u8 port_number; 292 }; 293 294 struct drm_dp_remote_dpcd_write_nak_reply { 295 u8 port_number; 296 u8 reason; 297 u8 bytes_written_before_failure; 298 }; 299 300 struct drm_dp_remote_i2c_read_ack_reply { 301 u8 port_number; 302 u8 num_bytes; 303 u8 bytes[255]; 304 }; 305 306 struct drm_dp_remote_i2c_read_nak_reply { 307 u8 port_number; 308 u8 nak_reason; 309 u8 i2c_nak_transaction; 310 }; 311 312 struct drm_dp_remote_i2c_write_ack_reply { 313 u8 port_number; 314 }; 315 316 struct drm_dp_query_stream_enc_status_ack_reply { 317 /* Bit[23:16]- Stream Id */ 318 u8 stream_id; 319 320 /* Bit[15]- Signed */ 321 bool reply_signed; 322 323 /* Bit[10:8]- Stream Output Sink Type */ 324 bool unauthorizable_device_present; 325 bool legacy_device_present; 326 bool query_capable_device_present; 327 328 /* Bit[12:11]- Stream Output CP Type */ 329 bool hdcp_1x_device_present; 330 bool hdcp_2x_device_present; 331 332 /* Bit[4]- Stream Authentication */ 333 bool auth_completed; 334 335 /* Bit[3]- Stream Encryption */ 336 bool encryption_enabled; 337 338 /* Bit[2]- Stream Repeater Function Present */ 339 bool repeater_present; 340 341 /* Bit[1:0]- Stream State */ 342 u8 state; 343 }; 344 345 #define DRM_DP_MAX_SDP_STREAMS 16 346 struct drm_dp_allocate_payload { 347 u8 port_number; 348 u8 number_sdp_streams; 349 u8 vcpi; 350 u16 pbn; 351 u8 sdp_stream_sink[DRM_DP_MAX_SDP_STREAMS]; 352 }; 353 354 struct drm_dp_allocate_payload_ack_reply { 355 u8 port_number; 356 u8 vcpi; 357 u16 allocated_pbn; 358 }; 359 360 struct drm_dp_connection_status_notify { 361 u8 guid[16]; 362 u8 port_number; 363 bool legacy_device_plug_status; 364 bool displayport_device_plug_status; 365 bool message_capability_status; 366 bool input_port; 367 u8 peer_device_type; 368 }; 369 370 struct drm_dp_remote_dpcd_read { 371 u8 port_number; 372 u32 dpcd_address; 373 u8 num_bytes; 374 }; 375 376 struct drm_dp_remote_dpcd_write { 377 u8 port_number; 378 u32 dpcd_address; 379 u8 num_bytes; 380 u8 *bytes; 381 }; 382 383 #define DP_REMOTE_I2C_READ_MAX_TRANSACTIONS 4 384 struct drm_dp_remote_i2c_read { 385 u8 num_transactions; 386 u8 port_number; 387 struct drm_dp_remote_i2c_read_tx { 388 u8 i2c_dev_id; 389 u8 num_bytes; 390 u8 *bytes; 391 u8 no_stop_bit; 392 u8 i2c_transaction_delay; 393 } transactions[DP_REMOTE_I2C_READ_MAX_TRANSACTIONS]; 394 u8 read_i2c_device_id; 395 u8 num_bytes_read; 396 }; 397 398 struct drm_dp_remote_i2c_write { 399 u8 port_number; 400 u8 write_i2c_device_id; 401 u8 num_bytes; 402 u8 *bytes; 403 }; 404 405 struct drm_dp_query_stream_enc_status { 406 u8 stream_id; 407 u8 client_id[7]; /* 56-bit nonce */ 408 u8 stream_event; 409 bool valid_stream_event; 410 u8 stream_behavior; 411 u8 valid_stream_behavior; 412 }; 413 414 /* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */ 415 struct drm_dp_port_number_req { 416 u8 port_number; 417 }; 418 419 struct drm_dp_enum_path_resources_ack_reply { 420 u8 port_number; 421 bool fec_capable; 422 u16 full_payload_bw_number; 423 u16 avail_payload_bw_number; 424 }; 425 426 /* covers POWER_DOWN_PHY, POWER_UP_PHY */ 427 struct drm_dp_port_number_rep { 428 u8 port_number; 429 }; 430 431 struct drm_dp_query_payload { 432 u8 port_number; 433 u8 vcpi; 434 }; 435 436 struct drm_dp_resource_status_notify { 437 u8 port_number; 438 u8 guid[16]; 439 u16 available_pbn; 440 }; 441 442 struct drm_dp_query_payload_ack_reply { 443 u8 port_number; 444 u16 allocated_pbn; 445 }; 446 447 struct drm_dp_sideband_msg_req_body { 448 u8 req_type; 449 union ack_req { 450 struct drm_dp_connection_status_notify conn_stat; 451 struct drm_dp_port_number_req port_num; 452 struct drm_dp_resource_status_notify resource_stat; 453 454 struct drm_dp_query_payload query_payload; 455 struct drm_dp_allocate_payload allocate_payload; 456 457 struct drm_dp_remote_dpcd_read dpcd_read; 458 struct drm_dp_remote_dpcd_write dpcd_write; 459 460 struct drm_dp_remote_i2c_read i2c_read; 461 struct drm_dp_remote_i2c_write i2c_write; 462 463 struct drm_dp_query_stream_enc_status enc_status; 464 } u; 465 }; 466 467 struct drm_dp_sideband_msg_reply_body { 468 u8 reply_type; 469 u8 req_type; 470 union ack_replies { 471 struct drm_dp_nak_reply nak; 472 struct drm_dp_link_address_ack_reply link_addr; 473 struct drm_dp_port_number_rep port_number; 474 475 struct drm_dp_enum_path_resources_ack_reply path_resources; 476 struct drm_dp_allocate_payload_ack_reply allocate_payload; 477 struct drm_dp_query_payload_ack_reply query_payload; 478 479 struct drm_dp_remote_dpcd_read_ack_reply remote_dpcd_read_ack; 480 struct drm_dp_remote_dpcd_write_ack_reply remote_dpcd_write_ack; 481 struct drm_dp_remote_dpcd_write_nak_reply remote_dpcd_write_nack; 482 483 struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack; 484 struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack; 485 struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack; 486 487 struct drm_dp_query_stream_enc_status_ack_reply enc_status; 488 } u; 489 }; 490 491 /* msg is queued to be put into a slot */ 492 #define DRM_DP_SIDEBAND_TX_QUEUED 0 493 /* msg has started transmitting on a slot - still on msgq */ 494 #define DRM_DP_SIDEBAND_TX_START_SEND 1 495 /* msg has finished transmitting on a slot - removed from msgq only in slot */ 496 #define DRM_DP_SIDEBAND_TX_SENT 2 497 /* msg has received a response - removed from slot */ 498 #define DRM_DP_SIDEBAND_TX_RX 3 499 #define DRM_DP_SIDEBAND_TX_TIMEOUT 4 500 501 struct drm_dp_sideband_msg_tx { 502 u8 msg[256]; 503 u8 chunk[48]; 504 u8 cur_offset; 505 u8 cur_len; 506 struct drm_dp_mst_branch *dst; 507 struct list_head next; 508 int seqno; 509 int state; 510 bool path_msg; 511 struct drm_dp_sideband_msg_reply_body reply; 512 }; 513 514 /* sideband msg handler */ 515 struct drm_dp_mst_topology_mgr; 516 struct drm_dp_mst_topology_cbs { 517 /* create a connector for a port */ 518 struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, const char *path); 519 /* 520 * Checks for any pending MST interrupts, passing them to MST core for 521 * processing, the same way an HPD IRQ pulse handler would do this. 522 * If provided MST core calls this callback from a poll-waiting loop 523 * when waiting for MST down message replies. The driver is expected 524 * to guard against a race between this callback and the driver's HPD 525 * IRQ pulse handler. 526 */ 527 void (*poll_hpd_irq)(struct drm_dp_mst_topology_mgr *mgr); 528 }; 529 530 #define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8) 531 532 #define DP_PAYLOAD_LOCAL 1 533 #define DP_PAYLOAD_REMOTE 2 534 #define DP_PAYLOAD_DELETE_LOCAL 3 535 536 struct drm_dp_payload { 537 int payload_state; 538 int start_slot; 539 int num_slots; 540 int vcpi; 541 }; 542 543 #define to_dp_mst_topology_state(x) container_of(x, struct drm_dp_mst_topology_state, base) 544 545 struct drm_dp_vcpi_allocation { 546 struct drm_dp_mst_port *port; 547 int vcpi; 548 int pbn; 549 bool dsc_enabled; 550 struct list_head next; 551 }; 552 553 struct drm_dp_mst_topology_state { 554 struct drm_private_state base; 555 struct list_head vcpis; 556 struct drm_dp_mst_topology_mgr *mgr; 557 u8 total_avail_slots; 558 u8 start_slot; 559 }; 560 561 #define to_dp_mst_topology_mgr(x) container_of(x, struct drm_dp_mst_topology_mgr, base) 562 563 /** 564 * struct drm_dp_mst_topology_mgr - DisplayPort MST manager 565 * 566 * This struct represents the toplevel displayport MST topology manager. 567 * There should be one instance of this for every MST capable DP connector 568 * on the GPU. 569 */ 570 struct drm_dp_mst_topology_mgr { 571 /** 572 * @base: Base private object for atomic 573 */ 574 struct drm_private_obj base; 575 576 /** 577 * @dev: device pointer for adding i2c devices etc. 578 */ 579 struct drm_device *dev; 580 /** 581 * @cbs: callbacks for connector addition and destruction. 582 */ 583 const struct drm_dp_mst_topology_cbs *cbs; 584 /** 585 * @max_dpcd_transaction_bytes: maximum number of bytes to read/write 586 * in one go. 587 */ 588 int max_dpcd_transaction_bytes; 589 /** 590 * @aux: AUX channel for the DP MST connector this topolgy mgr is 591 * controlling. 592 */ 593 struct drm_dp_aux *aux; 594 /** 595 * @max_payloads: maximum number of payloads the GPU can generate. 596 */ 597 int max_payloads; 598 /** 599 * @max_lane_count: maximum number of lanes the GPU can drive. 600 */ 601 int max_lane_count; 602 /** 603 * @max_link_rate: maximum link rate per lane GPU can output, in kHz. 604 */ 605 int max_link_rate; 606 /** 607 * @conn_base_id: DRM connector ID this mgr is connected to. Only used 608 * to build the MST connector path value. 609 */ 610 int conn_base_id; 611 612 /** 613 * @up_req_recv: Message receiver state for up requests. 614 */ 615 struct drm_dp_sideband_msg_rx up_req_recv; 616 617 /** 618 * @down_rep_recv: Message receiver state for replies to down 619 * requests. 620 */ 621 struct drm_dp_sideband_msg_rx down_rep_recv; 622 623 /** 624 * @lock: protects @mst_state, @mst_primary, @dpcd, and 625 * @payload_id_table_cleared. 626 */ 627 struct mutex lock; 628 629 /** 630 * @probe_lock: Prevents @work and @up_req_work, the only writers of 631 * &drm_dp_mst_port.mstb and &drm_dp_mst_branch.ports, from racing 632 * while they update the topology. 633 */ 634 struct mutex probe_lock; 635 636 /** 637 * @mst_state: If this manager is enabled for an MST capable port. False 638 * if no MST sink/branch devices is connected. 639 */ 640 bool mst_state : 1; 641 642 /** 643 * @payload_id_table_cleared: Whether or not we've cleared the payload 644 * ID table for @mst_primary. Protected by @lock. 645 */ 646 bool payload_id_table_cleared : 1; 647 648 /** 649 * @mst_primary: Pointer to the primary/first branch device. 650 */ 651 struct drm_dp_mst_branch *mst_primary; 652 653 /** 654 * @dpcd: Cache of DPCD for primary port. 655 */ 656 u8 dpcd[DP_RECEIVER_CAP_SIZE]; 657 /** 658 * @sink_count: Sink count from DEVICE_SERVICE_IRQ_VECTOR_ESI0. 659 */ 660 u8 sink_count; 661 /** 662 * @pbn_div: PBN to slots divisor. 663 */ 664 int pbn_div; 665 666 /** 667 * @funcs: Atomic helper callbacks 668 */ 669 const struct drm_private_state_funcs *funcs; 670 671 /** 672 * @qlock: protects @tx_msg_downq and &drm_dp_sideband_msg_tx.state 673 */ 674 struct mutex qlock; 675 676 /** 677 * @tx_msg_downq: List of pending down requests 678 */ 679 struct list_head tx_msg_downq; 680 681 /** 682 * @payload_lock: Protect payload information. 683 */ 684 struct mutex payload_lock; 685 /** 686 * @proposed_vcpis: Array of pointers for the new VCPI allocation. The 687 * VCPI structure itself is &drm_dp_mst_port.vcpi, and the size of 688 * this array is determined by @max_payloads. 689 */ 690 struct drm_dp_vcpi **proposed_vcpis; 691 /** 692 * @payloads: Array of payloads. The size of this array is determined 693 * by @max_payloads. 694 */ 695 struct drm_dp_payload *payloads; 696 /** 697 * @payload_mask: Elements of @payloads actually in use. Since 698 * reallocation of active outputs isn't possible gaps can be created by 699 * disabling outputs out of order compared to how they've been enabled. 700 */ 701 unsigned long payload_mask; 702 /** 703 * @vcpi_mask: Similar to @payload_mask, but for @proposed_vcpis. 704 */ 705 unsigned long vcpi_mask; 706 707 /** 708 * @tx_waitq: Wait to queue stall for the tx worker. 709 */ 710 wait_queue_head_t tx_waitq; 711 /** 712 * @work: Probe work. 713 */ 714 struct work_struct work; 715 /** 716 * @tx_work: Sideband transmit worker. This can nest within the main 717 * @work worker for each transaction @work launches. 718 */ 719 struct work_struct tx_work; 720 721 /** 722 * @destroy_port_list: List of to be destroyed connectors. 723 */ 724 struct list_head destroy_port_list; 725 /** 726 * @destroy_branch_device_list: List of to be destroyed branch 727 * devices. 728 */ 729 struct list_head destroy_branch_device_list; 730 /** 731 * @delayed_destroy_lock: Protects @destroy_port_list and 732 * @destroy_branch_device_list. 733 */ 734 struct mutex delayed_destroy_lock; 735 736 /** 737 * @delayed_destroy_wq: Workqueue used for delayed_destroy_work items. 738 * A dedicated WQ makes it possible to drain any requeued work items 739 * on it. 740 */ 741 struct workqueue_struct *delayed_destroy_wq; 742 743 /** 744 * @delayed_destroy_work: Work item to destroy MST port and branch 745 * devices, needed to avoid locking inversion. 746 */ 747 struct work_struct delayed_destroy_work; 748 749 /** 750 * @up_req_list: List of pending up requests from the topology that 751 * need to be processed, in chronological order. 752 */ 753 struct list_head up_req_list; 754 /** 755 * @up_req_lock: Protects @up_req_list 756 */ 757 struct mutex up_req_lock; 758 /** 759 * @up_req_work: Work item to process up requests received from the 760 * topology. Needed to avoid blocking hotplug handling and sideband 761 * transmissions. 762 */ 763 struct work_struct up_req_work; 764 765 #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) 766 /** 767 * @topology_ref_history_lock: protects 768 * &drm_dp_mst_port.topology_ref_history and 769 * &drm_dp_mst_branch.topology_ref_history. 770 */ 771 struct mutex topology_ref_history_lock; 772 #endif 773 }; 774 775 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, 776 struct drm_device *dev, struct drm_dp_aux *aux, 777 int max_dpcd_transaction_bytes, 778 int max_payloads, 779 int max_lane_count, int max_link_rate, 780 int conn_base_id); 781 782 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr); 783 784 bool drm_dp_read_mst_cap(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE]); 785 int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state); 786 787 int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled); 788 789 790 int 791 drm_dp_mst_detect_port(struct drm_connector *connector, 792 struct drm_modeset_acquire_ctx *ctx, 793 struct drm_dp_mst_topology_mgr *mgr, 794 struct drm_dp_mst_port *port); 795 796 struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); 797 798 int drm_dp_get_vc_payload_bw(const struct drm_dp_mst_topology_mgr *mgr, 799 int link_rate, int link_lane_count); 800 801 int drm_dp_calc_pbn_mode(int clock, int bpp, bool dsc); 802 803 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, 804 struct drm_dp_mst_port *port, int pbn, int slots); 805 806 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); 807 808 809 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); 810 811 void drm_dp_mst_update_slots(struct drm_dp_mst_topology_state *mst_state, uint8_t link_encoding_cap); 812 813 void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, 814 struct drm_dp_mst_port *port); 815 816 817 int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, 818 int pbn); 819 820 821 int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr, int start_slot); 822 823 824 int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr); 825 826 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr); 827 828 void drm_dp_mst_dump_topology(struct seq_file *m, 829 struct drm_dp_mst_topology_mgr *mgr); 830 831 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr); 832 int __must_check 833 drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr, 834 bool sync); 835 836 ssize_t drm_dp_mst_dpcd_read(struct drm_dp_aux *aux, 837 unsigned int offset, void *buffer, size_t size); 838 ssize_t drm_dp_mst_dpcd_write(struct drm_dp_aux *aux, 839 unsigned int offset, void *buffer, size_t size); 840 841 int drm_dp_mst_connector_late_register(struct drm_connector *connector, 842 struct drm_dp_mst_port *port); 843 void drm_dp_mst_connector_early_unregister(struct drm_connector *connector, 844 struct drm_dp_mst_port *port); 845 846 struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state, 847 struct drm_dp_mst_topology_mgr *mgr); 848 int __must_check 849 drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state, 850 struct drm_dp_mst_topology_mgr *mgr, 851 struct drm_dp_mst_port *port, int pbn, 852 int pbn_div); 853 int drm_dp_mst_atomic_enable_dsc(struct drm_atomic_state *state, 854 struct drm_dp_mst_port *port, 855 int pbn, int pbn_div, 856 bool enable); 857 int __must_check 858 drm_dp_mst_add_affected_dsc_crtcs(struct drm_atomic_state *state, 859 struct drm_dp_mst_topology_mgr *mgr); 860 int __must_check 861 drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state, 862 struct drm_dp_mst_topology_mgr *mgr, 863 struct drm_dp_mst_port *port); 864 int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr, 865 struct drm_dp_mst_port *port, bool power_up); 866 int drm_dp_send_query_stream_enc_status(struct drm_dp_mst_topology_mgr *mgr, 867 struct drm_dp_mst_port *port, 868 struct drm_dp_query_stream_enc_status_ack_reply *status); 869 int __must_check drm_dp_mst_atomic_check(struct drm_atomic_state *state); 870 871 void drm_dp_mst_get_port_malloc(struct drm_dp_mst_port *port); 872 void drm_dp_mst_put_port_malloc(struct drm_dp_mst_port *port); 873 874 struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port); 875 876 extern const struct drm_private_state_funcs drm_dp_mst_topology_state_funcs; 877 878 /** 879 * __drm_dp_mst_state_iter_get - private atomic state iterator function for 880 * macro-internal use 881 * @state: &struct drm_atomic_state pointer 882 * @mgr: pointer to the &struct drm_dp_mst_topology_mgr iteration cursor 883 * @old_state: optional pointer to the old &struct drm_dp_mst_topology_state 884 * iteration cursor 885 * @new_state: optional pointer to the new &struct drm_dp_mst_topology_state 886 * iteration cursor 887 * @i: int iteration cursor, for macro-internal use 888 * 889 * Used by for_each_oldnew_mst_mgr_in_state(), 890 * for_each_old_mst_mgr_in_state(), and for_each_new_mst_mgr_in_state(). Don't 891 * call this directly. 892 * 893 * Returns: 894 * True if the current &struct drm_private_obj is a &struct 895 * drm_dp_mst_topology_mgr, false otherwise. 896 */ 897 static inline bool 898 __drm_dp_mst_state_iter_get(struct drm_atomic_state *state, 899 struct drm_dp_mst_topology_mgr **mgr, 900 struct drm_dp_mst_topology_state **old_state, 901 struct drm_dp_mst_topology_state **new_state, 902 int i) 903 { 904 struct __drm_private_objs_state *objs_state = &state->private_objs[i]; 905 906 if (objs_state->ptr->funcs != &drm_dp_mst_topology_state_funcs) 907 return false; 908 909 *mgr = to_dp_mst_topology_mgr(objs_state->ptr); 910 if (old_state) 911 *old_state = to_dp_mst_topology_state(objs_state->old_state); 912 if (new_state) 913 *new_state = to_dp_mst_topology_state(objs_state->new_state); 914 915 return true; 916 } 917 918 /** 919 * for_each_oldnew_mst_mgr_in_state - iterate over all DP MST topology 920 * managers in an atomic update 921 * @__state: &struct drm_atomic_state pointer 922 * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor 923 * @old_state: &struct drm_dp_mst_topology_state iteration cursor for the old 924 * state 925 * @new_state: &struct drm_dp_mst_topology_state iteration cursor for the new 926 * state 927 * @__i: int iteration cursor, for macro-internal use 928 * 929 * This iterates over all DRM DP MST topology managers in an atomic update, 930 * tracking both old and new state. This is useful in places where the state 931 * delta needs to be considered, for example in atomic check functions. 932 */ 933 #define for_each_oldnew_mst_mgr_in_state(__state, mgr, old_state, new_state, __i) \ 934 for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \ 935 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), &(old_state), &(new_state), (__i))) 936 937 /** 938 * for_each_old_mst_mgr_in_state - iterate over all DP MST topology managers 939 * in an atomic update 940 * @__state: &struct drm_atomic_state pointer 941 * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor 942 * @old_state: &struct drm_dp_mst_topology_state iteration cursor for the old 943 * state 944 * @__i: int iteration cursor, for macro-internal use 945 * 946 * This iterates over all DRM DP MST topology managers in an atomic update, 947 * tracking only the old state. This is useful in disable functions, where we 948 * need the old state the hardware is still in. 949 */ 950 #define for_each_old_mst_mgr_in_state(__state, mgr, old_state, __i) \ 951 for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \ 952 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), &(old_state), NULL, (__i))) 953 954 /** 955 * for_each_new_mst_mgr_in_state - iterate over all DP MST topology managers 956 * in an atomic update 957 * @__state: &struct drm_atomic_state pointer 958 * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor 959 * @new_state: &struct drm_dp_mst_topology_state iteration cursor for the new 960 * state 961 * @__i: int iteration cursor, for macro-internal use 962 * 963 * This iterates over all DRM DP MST topology managers in an atomic update, 964 * tracking only the new state. This is useful in enable functions, where we 965 * need the new state the hardware should be in when the atomic commit 966 * operation has completed. 967 */ 968 #define for_each_new_mst_mgr_in_state(__state, mgr, new_state, __i) \ 969 for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \ 970 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), NULL, &(new_state), (__i))) 971 972 #endif 973