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/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 33enum drm_dp_mst_topology_ref_type { 34 DRM_DP_MST_TOPOLOGY_REF_GET, 35 DRM_DP_MST_TOPOLOGY_REF_PUT, 36}; 37 38struct 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 49struct 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 */ 58struct 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 */ 98struct 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 */ 168struct 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 180struct 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 */ 207struct 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 261struct drm_dp_nak_reply { 262 u8 guid[16]; 263 u8 reason; 264 u8 nak_data; 265}; 266 267struct 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 284struct drm_dp_remote_dpcd_read_ack_reply { 285 u8 port_number; 286 u8 num_bytes; 287 u8 bytes[255]; 288}; 289 290struct drm_dp_remote_dpcd_write_ack_reply { 291 u8 port_number; 292}; 293 294struct drm_dp_remote_dpcd_write_nak_reply { 295 u8 port_number; 296 u8 reason; 297 u8 bytes_written_before_failure; 298}; 299 300struct drm_dp_remote_i2c_read_ack_reply { 301 u8 port_number; 302 u8 num_bytes; 303 u8 bytes[255]; 304}; 305 306struct drm_dp_remote_i2c_read_nak_reply { 307 u8 port_number; 308 u8 nak_reason; 309 u8 i2c_nak_transaction; 310}; 311 312struct drm_dp_remote_i2c_write_ack_reply { 313 u8 port_number; 314}; 315 316struct 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 346struct 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 354struct drm_dp_allocate_payload_ack_reply { 355 u8 port_number; 356 u8 vcpi; 357 u16 allocated_pbn; 358}; 359 360struct 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 370struct drm_dp_remote_dpcd_read { 371 u8 port_number; 372 u32 dpcd_address; 373 u8 num_bytes; 374}; 375 376struct 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 384struct 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 398struct drm_dp_remote_i2c_write { 399 u8 port_number; 400 u8 write_i2c_device_id; 401 u8 num_bytes; 402 u8 *bytes; 403}; 404 405struct 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 */ 415struct drm_dp_port_number_req { 416 u8 port_number; 417}; 418 419struct 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 */ 427struct drm_dp_port_number_rep { 428 u8 port_number; 429}; 430 431struct drm_dp_query_payload { 432 u8 port_number; 433 u8 vcpi; 434}; 435 436struct drm_dp_resource_status_notify { 437 u8 port_number; 438 u8 guid[16]; 439 u16 available_pbn; 440}; 441 442struct drm_dp_query_payload_ack_reply { 443 u8 port_number; 444 u16 allocated_pbn; 445}; 446 447struct 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 467struct 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 501struct 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 */ 515struct drm_dp_mst_topology_mgr; 516struct 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 536struct 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 545struct 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 553struct 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}; 558 559#define to_dp_mst_topology_mgr(x) container_of(x, struct drm_dp_mst_topology_mgr, base) 560 561/** 562 * struct drm_dp_mst_topology_mgr - DisplayPort MST manager 563 * 564 * This struct represents the toplevel displayport MST topology manager. 565 * There should be one instance of this for every MST capable DP connector 566 * on the GPU. 567 */ 568struct drm_dp_mst_topology_mgr { 569 /** 570 * @base: Base private object for atomic 571 */ 572 struct drm_private_obj base; 573 574 /** 575 * @dev: device pointer for adding i2c devices etc. 576 */ 577 struct drm_device *dev; 578 /** 579 * @cbs: callbacks for connector addition and destruction. 580 */ 581 const struct drm_dp_mst_topology_cbs *cbs; 582 /** 583 * @max_dpcd_transaction_bytes: maximum number of bytes to read/write 584 * in one go. 585 */ 586 int max_dpcd_transaction_bytes; 587 /** 588 * @aux: AUX channel for the DP MST connector this topolgy mgr is 589 * controlling. 590 */ 591 struct drm_dp_aux *aux; 592 /** 593 * @max_payloads: maximum number of payloads the GPU can generate. 594 */ 595 int max_payloads; 596 /** 597 * @conn_base_id: DRM connector ID this mgr is connected to. Only used 598 * to build the MST connector path value. 599 */ 600 int conn_base_id; 601 602 /** 603 * @up_req_recv: Message receiver state for up requests. 604 */ 605 struct drm_dp_sideband_msg_rx up_req_recv; 606 607 /** 608 * @down_rep_recv: Message receiver state for replies to down 609 * requests. 610 */ 611 struct drm_dp_sideband_msg_rx down_rep_recv; 612 613 /** 614 * @lock: protects @mst_state, @mst_primary, @dpcd, and 615 * @payload_id_table_cleared. 616 */ 617 struct mutex lock; 618 619 /** 620 * @probe_lock: Prevents @work and @up_req_work, the only writers of 621 * &drm_dp_mst_port.mstb and &drm_dp_mst_branch.ports, from racing 622 * while they update the topology. 623 */ 624 struct mutex probe_lock; 625 626 /** 627 * @mst_state: If this manager is enabled for an MST capable port. False 628 * if no MST sink/branch devices is connected. 629 */ 630 bool mst_state : 1; 631 632 /** 633 * @payload_id_table_cleared: Whether or not we've cleared the payload 634 * ID table for @mst_primary. Protected by @lock. 635 */ 636 bool payload_id_table_cleared : 1; 637 638 /** 639 * @mst_primary: Pointer to the primary/first branch device. 640 */ 641 struct drm_dp_mst_branch *mst_primary; 642 643 /** 644 * @dpcd: Cache of DPCD for primary port. 645 */ 646 u8 dpcd[DP_RECEIVER_CAP_SIZE]; 647 /** 648 * @sink_count: Sink count from DEVICE_SERVICE_IRQ_VECTOR_ESI0. 649 */ 650 u8 sink_count; 651 /** 652 * @pbn_div: PBN to slots divisor. 653 */ 654 int pbn_div; 655 656 /** 657 * @funcs: Atomic helper callbacks 658 */ 659 const struct drm_private_state_funcs *funcs; 660 661 /** 662 * @qlock: protects @tx_msg_downq and &drm_dp_sideband_msg_tx.state 663 */ 664 struct mutex qlock; 665 666 /** 667 * @tx_msg_downq: List of pending down requests 668 */ 669 struct list_head tx_msg_downq; 670 671 /** 672 * @payload_lock: Protect payload information. 673 */ 674 struct mutex payload_lock; 675 /** 676 * @proposed_vcpis: Array of pointers for the new VCPI allocation. The 677 * VCPI structure itself is &drm_dp_mst_port.vcpi, and the size of 678 * this array is determined by @max_payloads. 679 */ 680 struct drm_dp_vcpi **proposed_vcpis; 681 /** 682 * @payloads: Array of payloads. The size of this array is determined 683 * by @max_payloads. 684 */ 685 struct drm_dp_payload *payloads; 686 /** 687 * @payload_mask: Elements of @payloads actually in use. Since 688 * reallocation of active outputs isn't possible gaps can be created by 689 * disabling outputs out of order compared to how they've been enabled. 690 */ 691 unsigned long payload_mask; 692 /** 693 * @vcpi_mask: Similar to @payload_mask, but for @proposed_vcpis. 694 */ 695 unsigned long vcpi_mask; 696 697 /** 698 * @tx_waitq: Wait to queue stall for the tx worker. 699 */ 700 wait_queue_head_t tx_waitq; 701 /** 702 * @work: Probe work. 703 */ 704 struct work_struct work; 705 /** 706 * @tx_work: Sideband transmit worker. This can nest within the main 707 * @work worker for each transaction @work launches. 708 */ 709 struct work_struct tx_work; 710 711 /** 712 * @destroy_port_list: List of to be destroyed connectors. 713 */ 714 struct list_head destroy_port_list; 715 /** 716 * @destroy_branch_device_list: List of to be destroyed branch 717 * devices. 718 */ 719 struct list_head destroy_branch_device_list; 720 /** 721 * @delayed_destroy_lock: Protects @destroy_port_list and 722 * @destroy_branch_device_list. 723 */ 724 struct mutex delayed_destroy_lock; 725 726 /** 727 * @delayed_destroy_wq: Workqueue used for delayed_destroy_work items. 728 * A dedicated WQ makes it possible to drain any requeued work items 729 * on it. 730 */ 731 struct workqueue_struct *delayed_destroy_wq; 732 733 /** 734 * @delayed_destroy_work: Work item to destroy MST port and branch 735 * devices, needed to avoid locking inversion. 736 */ 737 struct work_struct delayed_destroy_work; 738 739 /** 740 * @up_req_list: List of pending up requests from the topology that 741 * need to be processed, in chronological order. 742 */ 743 struct list_head up_req_list; 744 /** 745 * @up_req_lock: Protects @up_req_list 746 */ 747 struct mutex up_req_lock; 748 /** 749 * @up_req_work: Work item to process up requests received from the 750 * topology. Needed to avoid blocking hotplug handling and sideband 751 * transmissions. 752 */ 753 struct work_struct up_req_work; 754 755#if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) 756 /** 757 * @topology_ref_history_lock: protects 758 * &drm_dp_mst_port.topology_ref_history and 759 * &drm_dp_mst_branch.topology_ref_history. 760 */ 761 struct mutex topology_ref_history_lock; 762#endif 763}; 764 765int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, 766 struct drm_device *dev, struct drm_dp_aux *aux, 767 int max_dpcd_transaction_bytes, 768 int max_payloads, int conn_base_id); 769 770void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr); 771 772bool drm_dp_read_mst_cap(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE]); 773int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state); 774 775int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled); 776 777 778int 779drm_dp_mst_detect_port(struct drm_connector *connector, 780 struct drm_modeset_acquire_ctx *ctx, 781 struct drm_dp_mst_topology_mgr *mgr, 782 struct drm_dp_mst_port *port); 783 784struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); 785 786int drm_dp_get_vc_payload_bw(int link_rate, int link_lane_count); 787 788int drm_dp_calc_pbn_mode(int clock, int bpp, bool dsc); 789 790bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, 791 struct drm_dp_mst_port *port, int pbn, int slots); 792 793int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); 794 795 796void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); 797 798 799void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, 800 struct drm_dp_mst_port *port); 801 802 803int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, 804 int pbn); 805 806 807int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr); 808 809 810int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr); 811 812int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr); 813 814void drm_dp_mst_dump_topology(struct seq_file *m, 815 struct drm_dp_mst_topology_mgr *mgr); 816 817void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr); 818int __must_check 819drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr, 820 bool sync); 821 822ssize_t drm_dp_mst_dpcd_read(struct drm_dp_aux *aux, 823 unsigned int offset, void *buffer, size_t size); 824ssize_t drm_dp_mst_dpcd_write(struct drm_dp_aux *aux, 825 unsigned int offset, void *buffer, size_t size); 826 827int drm_dp_mst_connector_late_register(struct drm_connector *connector, 828 struct drm_dp_mst_port *port); 829void drm_dp_mst_connector_early_unregister(struct drm_connector *connector, 830 struct drm_dp_mst_port *port); 831 832struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state, 833 struct drm_dp_mst_topology_mgr *mgr); 834int __must_check 835drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state, 836 struct drm_dp_mst_topology_mgr *mgr, 837 struct drm_dp_mst_port *port, int pbn, 838 int pbn_div); 839int drm_dp_mst_atomic_enable_dsc(struct drm_atomic_state *state, 840 struct drm_dp_mst_port *port, 841 int pbn, int pbn_div, 842 bool enable); 843int __must_check 844drm_dp_mst_add_affected_dsc_crtcs(struct drm_atomic_state *state, 845 struct drm_dp_mst_topology_mgr *mgr); 846int __must_check 847drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state, 848 struct drm_dp_mst_topology_mgr *mgr, 849 struct drm_dp_mst_port *port); 850int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr, 851 struct drm_dp_mst_port *port, bool power_up); 852int drm_dp_send_query_stream_enc_status(struct drm_dp_mst_topology_mgr *mgr, 853 struct drm_dp_mst_port *port, 854 struct drm_dp_query_stream_enc_status_ack_reply *status); 855int __must_check drm_dp_mst_atomic_check(struct drm_atomic_state *state); 856 857void drm_dp_mst_get_port_malloc(struct drm_dp_mst_port *port); 858void drm_dp_mst_put_port_malloc(struct drm_dp_mst_port *port); 859 860struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port); 861 862extern const struct drm_private_state_funcs drm_dp_mst_topology_state_funcs; 863 864/** 865 * __drm_dp_mst_state_iter_get - private atomic state iterator function for 866 * macro-internal use 867 * @state: &struct drm_atomic_state pointer 868 * @mgr: pointer to the &struct drm_dp_mst_topology_mgr iteration cursor 869 * @old_state: optional pointer to the old &struct drm_dp_mst_topology_state 870 * iteration cursor 871 * @new_state: optional pointer to the new &struct drm_dp_mst_topology_state 872 * iteration cursor 873 * @i: int iteration cursor, for macro-internal use 874 * 875 * Used by for_each_oldnew_mst_mgr_in_state(), 876 * for_each_old_mst_mgr_in_state(), and for_each_new_mst_mgr_in_state(). Don't 877 * call this directly. 878 * 879 * Returns: 880 * True if the current &struct drm_private_obj is a &struct 881 * drm_dp_mst_topology_mgr, false otherwise. 882 */ 883static inline bool 884__drm_dp_mst_state_iter_get(struct drm_atomic_state *state, 885 struct drm_dp_mst_topology_mgr **mgr, 886 struct drm_dp_mst_topology_state **old_state, 887 struct drm_dp_mst_topology_state **new_state, 888 int i) 889{ 890 struct __drm_private_objs_state *objs_state = &state->private_objs[i]; 891 892 if (objs_state->ptr->funcs != &drm_dp_mst_topology_state_funcs) 893 return false; 894 895 *mgr = to_dp_mst_topology_mgr(objs_state->ptr); 896 if (old_state) 897 *old_state = to_dp_mst_topology_state(objs_state->old_state); 898 if (new_state) 899 *new_state = to_dp_mst_topology_state(objs_state->new_state); 900 901 return true; 902} 903 904/** 905 * for_each_oldnew_mst_mgr_in_state - iterate over all DP MST topology 906 * managers in an atomic update 907 * @__state: &struct drm_atomic_state pointer 908 * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor 909 * @old_state: &struct drm_dp_mst_topology_state iteration cursor for the old 910 * state 911 * @new_state: &struct drm_dp_mst_topology_state iteration cursor for the new 912 * state 913 * @__i: int iteration cursor, for macro-internal use 914 * 915 * This iterates over all DRM DP MST topology managers in an atomic update, 916 * tracking both old and new state. This is useful in places where the state 917 * delta needs to be considered, for example in atomic check functions. 918 */ 919#define for_each_oldnew_mst_mgr_in_state(__state, mgr, old_state, new_state, __i) \ 920 for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \ 921 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), &(old_state), &(new_state), (__i))) 922 923/** 924 * for_each_old_mst_mgr_in_state - iterate over all DP MST topology managers 925 * in an atomic update 926 * @__state: &struct drm_atomic_state pointer 927 * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor 928 * @old_state: &struct drm_dp_mst_topology_state iteration cursor for the old 929 * state 930 * @__i: int iteration cursor, for macro-internal use 931 * 932 * This iterates over all DRM DP MST topology managers in an atomic update, 933 * tracking only the old state. This is useful in disable functions, where we 934 * need the old state the hardware is still in. 935 */ 936#define for_each_old_mst_mgr_in_state(__state, mgr, old_state, __i) \ 937 for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \ 938 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), &(old_state), NULL, (__i))) 939 940/** 941 * for_each_new_mst_mgr_in_state - iterate over all DP MST topology managers 942 * in an atomic update 943 * @__state: &struct drm_atomic_state pointer 944 * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor 945 * @new_state: &struct drm_dp_mst_topology_state iteration cursor for the new 946 * state 947 * @__i: int iteration cursor, for macro-internal use 948 * 949 * This iterates over all DRM DP MST topology managers in an atomic update, 950 * tracking only the new state. This is useful in enable functions, where we 951 * need the new state the hardware should be in when the atomic commit 952 * operation has completed. 953 */ 954#define for_each_new_mst_mgr_in_state(__state, mgr, new_state, __i) \ 955 for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \ 956 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), NULL, &(new_state), (__i))) 957 958#endif 959