include/drm/drm_dp_mst_helper.h

   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
  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
 317 #define DRM_DP_MAX_SDP_STREAMS 16
 318 struct drm_dp_allocate_payload {
 319         u8 port_number;
 320         u8 number_sdp_streams;
 321         u8 vcpi;
 322         u16 pbn;
 323         u8 sdp_stream_sink[DRM_DP_MAX_SDP_STREAMS];
 324 };
 325
 326 struct drm_dp_allocate_payload_ack_reply {
 327         u8 port_number;
 328         u8 vcpi;
 329         u16 allocated_pbn;
 330 };
 331
 332 struct drm_dp_connection_status_notify {
 333         u8 guid[16];
 334         u8 port_number;
 335         bool legacy_device_plug_status;
 336         bool displayport_device_plug_status;
 337         bool message_capability_status;
 338         bool input_port;
 339         u8 peer_device_type;
 340 };
 341
 342 struct drm_dp_remote_dpcd_read {
 343         u8 port_number;
 344         u32 dpcd_address;
 345         u8 num_bytes;
 346 };
 347
 348 struct drm_dp_remote_dpcd_write {
 349         u8 port_number;
 350         u32 dpcd_address;
 351         u8 num_bytes;
 352         u8 *bytes;
 353 };
 354
 355 #define DP_REMOTE_I2C_READ_MAX_TRANSACTIONS 4
 356 struct drm_dp_remote_i2c_read {
 357         u8 num_transactions;
 358         u8 port_number;
 359         struct drm_dp_remote_i2c_read_tx {
 360                 u8 i2c_dev_id;
 361                 u8 num_bytes;
 362                 u8 *bytes;
 363                 u8 no_stop_bit;
 364                 u8 i2c_transaction_delay;
 365         } transactions[DP_REMOTE_I2C_READ_MAX_TRANSACTIONS];
 366         u8 read_i2c_device_id;
 367         u8 num_bytes_read;
 368 };
 369
 370 struct drm_dp_remote_i2c_write {
 371         u8 port_number;
 372         u8 write_i2c_device_id;
 373         u8 num_bytes;
 374         u8 *bytes;
 375 };
 376
 377 /* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */
 378 struct drm_dp_port_number_req {
 379         u8 port_number;
 380 };
 381
 382 struct drm_dp_enum_path_resources_ack_reply {
 383         u8 port_number;
 384         bool fec_capable;
 385         u16 full_payload_bw_number;
 386         u16 avail_payload_bw_number;
 387 };
 388
 389 /* covers POWER_DOWN_PHY, POWER_UP_PHY */
 390 struct drm_dp_port_number_rep {
 391         u8 port_number;
 392 };
 393
 394 struct drm_dp_query_payload {
 395         u8 port_number;
 396         u8 vcpi;
 397 };
 398
 399 struct drm_dp_resource_status_notify {
 400         u8 port_number;
 401         u8 guid[16];
 402         u16 available_pbn;
 403 };
 404
 405 struct drm_dp_query_payload_ack_reply {
 406         u8 port_number;
 407         u16 allocated_pbn;
 408 };
 409
 410 struct drm_dp_sideband_msg_req_body {
 411         u8 req_type;
 412         union ack_req {
 413                 struct drm_dp_connection_status_notify conn_stat;
 414                 struct drm_dp_port_number_req port_num;
 415                 struct drm_dp_resource_status_notify resource_stat;
 416
 417                 struct drm_dp_query_payload query_payload;
 418                 struct drm_dp_allocate_payload allocate_payload;
 419
 420                 struct drm_dp_remote_dpcd_read dpcd_read;
 421                 struct drm_dp_remote_dpcd_write dpcd_write;
 422
 423                 struct drm_dp_remote_i2c_read i2c_read;
 424                 struct drm_dp_remote_i2c_write i2c_write;
 425         } u;
 426 };
 427
 428 struct drm_dp_sideband_msg_reply_body {
 429         u8 reply_type;
 430         u8 req_type;
 431         union ack_replies {
 432                 struct drm_dp_nak_reply nak;
 433                 struct drm_dp_link_address_ack_reply link_addr;
 434                 struct drm_dp_port_number_rep port_number;
 435
 436                 struct drm_dp_enum_path_resources_ack_reply path_resources;
 437                 struct drm_dp_allocate_payload_ack_reply allocate_payload;
 438                 struct drm_dp_query_payload_ack_reply query_payload;
 439
 440                 struct drm_dp_remote_dpcd_read_ack_reply remote_dpcd_read_ack;
 441                 struct drm_dp_remote_dpcd_write_ack_reply remote_dpcd_write_ack;
 442                 struct drm_dp_remote_dpcd_write_nak_reply remote_dpcd_write_nack;
 443
 444                 struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack;
 445                 struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack;
 446                 struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack;
 447         } u;
 448 };
 449
 450 /* msg is queued to be put into a slot */
 451 #define DRM_DP_SIDEBAND_TX_QUEUED 0
 452 /* msg has started transmitting on a slot - still on msgq */
 453 #define DRM_DP_SIDEBAND_TX_START_SEND 1
 454 /* msg has finished transmitting on a slot - removed from msgq only in slot */
 455 #define DRM_DP_SIDEBAND_TX_SENT 2
 456 /* msg has received a response - removed from slot */
 457 #define DRM_DP_SIDEBAND_TX_RX 3
 458 #define DRM_DP_SIDEBAND_TX_TIMEOUT 4
 459
 460 struct drm_dp_sideband_msg_tx {
 461         u8 msg[256];
 462         u8 chunk[48];
 463         u8 cur_offset;
 464         u8 cur_len;
 465         struct drm_dp_mst_branch *dst;
 466         struct list_head next;
 467         int seqno;
 468         int state;
 469         bool path_msg;
 470         struct drm_dp_sideband_msg_reply_body reply;
 471 };
 472
 473 /* sideband msg handler */
 474 struct drm_dp_mst_topology_mgr;
 475 struct drm_dp_mst_topology_cbs {
 476         /* create a connector for a port */
 477         struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, const char *path);
 478         /*
 479          * Checks for any pending MST interrupts, passing them to MST core for
 480          * processing, the same way an HPD IRQ pulse handler would do this.
 481          * If provided MST core calls this callback from a poll-waiting loop
 482          * when waiting for MST down message replies. The driver is expected
 483          * to guard against a race between this callback and the driver's HPD
 484          * IRQ pulse handler.
 485          */
 486         void (*poll_hpd_irq)(struct drm_dp_mst_topology_mgr *mgr);
 487 };
 488
 489 #define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8)
 490
 491 #define DP_PAYLOAD_LOCAL 1
 492 #define DP_PAYLOAD_REMOTE 2
 493 #define DP_PAYLOAD_DELETE_LOCAL 3
 494
 495 struct drm_dp_payload {
 496         int payload_state;
 497         int start_slot;
 498         int num_slots;
 499         int vcpi;
 500 };
 501
 502 #define to_dp_mst_topology_state(x) container_of(x, struct drm_dp_mst_topology_state, base)
 503
 504 struct drm_dp_vcpi_allocation {
 505         struct drm_dp_mst_port *port;
 506         int vcpi;
 507         int pbn;
 508         bool dsc_enabled;
 509         struct list_head next;
 510 };
 511
 512 struct drm_dp_mst_topology_state {
 513         struct drm_private_state base;
 514         struct list_head vcpis;
 515         struct drm_dp_mst_topology_mgr *mgr;
 516 };
 517
 518 #define to_dp_mst_topology_mgr(x) container_of(x, struct drm_dp_mst_topology_mgr, base)
 519
 520 /**
 521  * struct drm_dp_mst_topology_mgr - DisplayPort MST manager
 522  *
 523  * This struct represents the toplevel displayport MST topology manager.
 524  * There should be one instance of this for every MST capable DP connector
 525  * on the GPU.
 526  */
 527 struct drm_dp_mst_topology_mgr {
 528         /**
 529          * @base: Base private object for atomic
 530          */
 531         struct drm_private_obj base;
 532
 533         /**
 534          * @dev: device pointer for adding i2c devices etc.
 535          */
 536         struct drm_device *dev;
 537         /**
 538          * @cbs: callbacks for connector addition and destruction.
 539          */
 540         const struct drm_dp_mst_topology_cbs *cbs;
 541         /**
 542          * @max_dpcd_transaction_bytes: maximum number of bytes to read/write
 543          * in one go.
 544          */
 545         int max_dpcd_transaction_bytes;
 546         /**
 547          * @aux: AUX channel for the DP MST connector this topolgy mgr is
 548          * controlling.
 549          */
 550         struct drm_dp_aux *aux;
 551         /**
 552          * @max_payloads: maximum number of payloads the GPU can generate.
 553          */
 554         int max_payloads;
 555         /**
 556          * @conn_base_id: DRM connector ID this mgr is connected to. Only used
 557          * to build the MST connector path value.
 558          */
 559         int conn_base_id;
 560
 561         /**
 562          * @up_req_recv: Message receiver state for up requests.
 563          */
 564         struct drm_dp_sideband_msg_rx up_req_recv;
 565
 566         /**
 567          * @down_rep_recv: Message receiver state for replies to down
 568          * requests.
 569          */
 570         struct drm_dp_sideband_msg_rx down_rep_recv;
 571
 572         /**
 573          * @lock: protects @mst_state, @mst_primary, @dpcd, and
 574          * @payload_id_table_cleared.
 575          */
 576         struct mutex lock;
 577
 578         /**
 579          * @probe_lock: Prevents @work and @up_req_work, the only writers of
 580          * &drm_dp_mst_port.mstb and &drm_dp_mst_branch.ports, from racing
 581          * while they update the topology.
 582          */
 583         struct mutex probe_lock;
 584
 585         /**
 586          * @mst_state: If this manager is enabled for an MST capable port. False
 587          * if no MST sink/branch devices is connected.
 588          */
 589         bool mst_state : 1;
 590
 591         /**
 592          * @payload_id_table_cleared: Whether or not we've cleared the payload
 593          * ID table for @mst_primary. Protected by @lock.
 594          */
 595         bool payload_id_table_cleared : 1;
 596
 597         /**
 598          * @mst_primary: Pointer to the primary/first branch device.
 599          */
 600         struct drm_dp_mst_branch *mst_primary;
 601
 602         /**
 603          * @dpcd: Cache of DPCD for primary port.
 604          */
 605         u8 dpcd[DP_RECEIVER_CAP_SIZE];
 606         /**
 607          * @sink_count: Sink count from DEVICE_SERVICE_IRQ_VECTOR_ESI0.
 608          */
 609         u8 sink_count;
 610         /**
 611          * @pbn_div: PBN to slots divisor.
 612          */
 613         int pbn_div;
 614
 615         /**
 616          * @funcs: Atomic helper callbacks
 617          */
 618         const struct drm_private_state_funcs *funcs;
 619
 620         /**
 621          * @qlock: protects @tx_msg_downq and &drm_dp_sideband_msg_tx.state
 622          */
 623         struct mutex qlock;
 624
 625         /**
 626          * @tx_msg_downq: List of pending down requests
 627          */
 628         struct list_head tx_msg_downq;
 629
 630         /**
 631          * @payload_lock: Protect payload information.
 632          */
 633         struct mutex payload_lock;
 634         /**
 635          * @proposed_vcpis: Array of pointers for the new VCPI allocation. The
 636          * VCPI structure itself is &drm_dp_mst_port.vcpi, and the size of
 637          * this array is determined by @max_payloads.
 638          */
 639         struct drm_dp_vcpi **proposed_vcpis;
 640         /**
 641          * @payloads: Array of payloads. The size of this array is determined
 642          * by @max_payloads.
 643          */
 644         struct drm_dp_payload *payloads;
 645         /**
 646          * @payload_mask: Elements of @payloads actually in use. Since
 647          * reallocation of active outputs isn't possible gaps can be created by
 648          * disabling outputs out of order compared to how they've been enabled.
 649          */
 650         unsigned long payload_mask;
 651         /**
 652          * @vcpi_mask: Similar to @payload_mask, but for @proposed_vcpis.
 653          */
 654         unsigned long vcpi_mask;
 655
 656         /**
 657          * @tx_waitq: Wait to queue stall for the tx worker.
 658          */
 659         wait_queue_head_t tx_waitq;
 660         /**
 661          * @work: Probe work.
 662          */
 663         struct work_struct work;
 664         /**
 665          * @tx_work: Sideband transmit worker. This can nest within the main
 666          * @work worker for each transaction @work launches.
 667          */
 668         struct work_struct tx_work;
 669
 670         /**
 671          * @destroy_port_list: List of to be destroyed connectors.
 672          */
 673         struct list_head destroy_port_list;
 674         /**
 675          * @destroy_branch_device_list: List of to be destroyed branch
 676          * devices.
 677          */
 678         struct list_head destroy_branch_device_list;
 679         /**
 680          * @delayed_destroy_lock: Protects @destroy_port_list and
 681          * @destroy_branch_device_list.
 682          */
 683         struct mutex delayed_destroy_lock;
 684
 685         /**
 686          * @delayed_destroy_wq: Workqueue used for delayed_destroy_work items.
 687          * A dedicated WQ makes it possible to drain any requeued work items
 688          * on it.
 689          */
 690         struct workqueue_struct *delayed_destroy_wq;
 691
 692         /**
 693          * @delayed_destroy_work: Work item to destroy MST port and branch
 694          * devices, needed to avoid locking inversion.
 695          */
 696         struct work_struct delayed_destroy_work;
 697
 698         /**
 699          * @up_req_list: List of pending up requests from the topology that
 700          * need to be processed, in chronological order.
 701          */
 702         struct list_head up_req_list;
 703         /**
 704          * @up_req_lock: Protects @up_req_list
 705          */
 706         struct mutex up_req_lock;
 707         /**
 708          * @up_req_work: Work item to process up requests received from the
 709          * topology. Needed to avoid blocking hotplug handling and sideband
 710          * transmissions.
 711          */
 712         struct work_struct up_req_work;
 713
 714 #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)
 715         /**
 716          * @topology_ref_history_lock: protects
 717          * &drm_dp_mst_port.topology_ref_history and
 718          * &drm_dp_mst_branch.topology_ref_history.
 719          */
 720         struct mutex topology_ref_history_lock;
 721 #endif
 722 };
 723
 724 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
 725                                  struct drm_device *dev, struct drm_dp_aux *aux,
 726                                  int max_dpcd_transaction_bytes,
 727                                  int max_payloads, int conn_base_id);
 728
 729 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr);
 730
 731
 732 int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state);
 733
 734
 735 int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled);
 736
 737
 738 int
 739 drm_dp_mst_detect_port(struct drm_connector *connector,
 740                        struct drm_modeset_acquire_ctx *ctx,
 741                        struct drm_dp_mst_topology_mgr *mgr,
 742                        struct drm_dp_mst_port *port);
 743
 744 struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
 745
 746
 747 int drm_dp_calc_pbn_mode(int clock, int bpp, bool dsc);
 748
 749 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
 750                               struct drm_dp_mst_port *port, int pbn, int slots);
 751
 752 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
 753
 754
 755 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
 756
 757
 758 void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
 759                                 struct drm_dp_mst_port *port);
 760
 761
 762 int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
 763                            int pbn);
 764
 765
 766 int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr);
 767
 768
 769 int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr);
 770
 771 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr);
 772
 773 void drm_dp_mst_dump_topology(struct seq_file *m,
 774                               struct drm_dp_mst_topology_mgr *mgr);
 775
 776 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr);
 777 int __must_check
 778 drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr,
 779                                bool sync);
 780
 781 ssize_t drm_dp_mst_dpcd_read(struct drm_dp_aux *aux,
 782                              unsigned int offset, void *buffer, size_t size);
 783 ssize_t drm_dp_mst_dpcd_write(struct drm_dp_aux *aux,
 784                               unsigned int offset, void *buffer, size_t size);
 785
 786 int drm_dp_mst_connector_late_register(struct drm_connector *connector,
 787                                        struct drm_dp_mst_port *port);
 788 void drm_dp_mst_connector_early_unregister(struct drm_connector *connector,
 789                                            struct drm_dp_mst_port *port);
 790
 791 struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
 792                                                                     struct drm_dp_mst_topology_mgr *mgr);
 793 int __must_check
 794 drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
 795                               struct drm_dp_mst_topology_mgr *mgr,
 796                               struct drm_dp_mst_port *port, int pbn,
 797                               int pbn_div);
 798 int drm_dp_mst_atomic_enable_dsc(struct drm_atomic_state *state,
 799                                  struct drm_dp_mst_port *port,
 800                                  int pbn, int pbn_div,
 801                                  bool enable);
 802 int __must_check
 803 drm_dp_mst_add_affected_dsc_crtcs(struct drm_atomic_state *state,
 804                                   struct drm_dp_mst_topology_mgr *mgr);
 805 int __must_check
 806 drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
 807                                  struct drm_dp_mst_topology_mgr *mgr,
 808                                  struct drm_dp_mst_port *port);
 809 int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr,
 810                                  struct drm_dp_mst_port *port, bool power_up);
 811 int __must_check drm_dp_mst_atomic_check(struct drm_atomic_state *state);
 812
 813 void drm_dp_mst_get_port_malloc(struct drm_dp_mst_port *port);
 814 void drm_dp_mst_put_port_malloc(struct drm_dp_mst_port *port);
 815
 816 struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port);
 817
 818 extern const struct drm_private_state_funcs drm_dp_mst_topology_state_funcs;
 819
 820 /**
 821  * __drm_dp_mst_state_iter_get - private atomic state iterator function for
 822  * macro-internal use
 823  * @state: &struct drm_atomic_state pointer
 824  * @mgr: pointer to the &struct drm_dp_mst_topology_mgr iteration cursor
 825  * @old_state: optional pointer to the old &struct drm_dp_mst_topology_state
 826  * iteration cursor
 827  * @new_state: optional pointer to the new &struct drm_dp_mst_topology_state
 828  * iteration cursor
 829  * @i: int iteration cursor, for macro-internal use
 830  *
 831  * Used by for_each_oldnew_mst_mgr_in_state(),
 832  * for_each_old_mst_mgr_in_state(), and for_each_new_mst_mgr_in_state(). Don't
 833  * call this directly.
 834  *
 835  * Returns:
 836  * True if the current &struct drm_private_obj is a &struct
 837  * drm_dp_mst_topology_mgr, false otherwise.
 838  */
 839 static inline bool
 840 __drm_dp_mst_state_iter_get(struct drm_atomic_state *state,
 841                             struct drm_dp_mst_topology_mgr **mgr,
 842                             struct drm_dp_mst_topology_state **old_state,
 843                             struct drm_dp_mst_topology_state **new_state,
 844                             int i)
 845 {
 846         struct __drm_private_objs_state *objs_state = &state->private_objs[i];
 847
 848         if (objs_state->ptr->funcs != &drm_dp_mst_topology_state_funcs)
 849                 return false;
 850
 851         *mgr = to_dp_mst_topology_mgr(objs_state->ptr);
 852         if (old_state)
 853                 *old_state = to_dp_mst_topology_state(objs_state->old_state);
 854         if (new_state)
 855                 *new_state = to_dp_mst_topology_state(objs_state->new_state);
 856
 857         return true;
 858 }
 859
 860 /**
 861  * for_each_oldnew_mst_mgr_in_state - iterate over all DP MST topology
 862  * managers in an atomic update
 863  * @__state: &struct drm_atomic_state pointer
 864  * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor
 865  * @old_state: &struct drm_dp_mst_topology_state iteration cursor for the old
 866  * state
 867  * @new_state: &struct drm_dp_mst_topology_state iteration cursor for the new
 868  * state
 869  * @__i: int iteration cursor, for macro-internal use
 870  *
 871  * This iterates over all DRM DP MST topology managers in an atomic update,
 872  * tracking both old and new state. This is useful in places where the state
 873  * delta needs to be considered, for example in atomic check functions.
 874  */
 875 #define for_each_oldnew_mst_mgr_in_state(__state, mgr, old_state, new_state, __i) \
 876         for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \
 877                 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), &(old_state), &(new_state), (__i)))
 878
 879 /**
 880  * for_each_old_mst_mgr_in_state - iterate over all DP MST topology managers
 881  * in an atomic update
 882  * @__state: &struct drm_atomic_state pointer
 883  * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor
 884  * @old_state: &struct drm_dp_mst_topology_state iteration cursor for the old
 885  * state
 886  * @__i: int iteration cursor, for macro-internal use
 887  *
 888  * This iterates over all DRM DP MST topology managers in an atomic update,
 889  * tracking only the old state. This is useful in disable functions, where we
 890  * need the old state the hardware is still in.
 891  */
 892 #define for_each_old_mst_mgr_in_state(__state, mgr, old_state, __i) \
 893         for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \
 894                 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), &(old_state), NULL, (__i)))
 895
 896 /**
 897  * for_each_new_mst_mgr_in_state - iterate over all DP MST topology managers
 898  * in an atomic update
 899  * @__state: &struct drm_atomic_state pointer
 900  * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor
 901  * @new_state: &struct drm_dp_mst_topology_state iteration cursor for the new
 902  * state
 903  * @__i: int iteration cursor, for macro-internal use
 904  *
 905  * This iterates over all DRM DP MST topology managers in an atomic update,
 906  * tracking only the new state. This is useful in enable functions, where we
 907  * need the new state the hardware should be in when the atomic commit
 908  * operation has completed.
 909  */
 910 #define for_each_new_mst_mgr_in_state(__state, mgr, new_state, __i) \
 911         for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \
 912                 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), NULL, &(new_state), (__i)))
 913
 914 #endif