/** * struct drm_dp_mst_port - MST port * @port_num: port number * @input: if this port is an input port. Protected by * &drm_dp_mst_topology_mgr.base.lock. * @mcs: message capability status - DP 1.2 spec. Protected by * &drm_dp_mst_topology_mgr.base.lock. * @ddps: DisplayPort Device Plug Status - DP 1.2. Protected by * &drm_dp_mst_topology_mgr.base.lock. * @pdt: Peer Device Type. Protected by * &drm_dp_mst_topology_mgr.base.lock. * @ldps: Legacy Device Plug Status. Protected by * &drm_dp_mst_topology_mgr.base.lock. * @dpcd_rev: DPCD revision of device on this port. Protected by * &drm_dp_mst_topology_mgr.base.lock. * @num_sdp_streams: Number of simultaneous streams. Protected by * &drm_dp_mst_topology_mgr.base.lock. * @num_sdp_stream_sinks: Number of stream sinks. Protected by * &drm_dp_mst_topology_mgr.base.lock. * @full_pbn: Max possible bandwidth for this port. Protected by * &drm_dp_mst_topology_mgr.base.lock. * @next: link to next port on this branch device * @aux: i2c aux transport to talk to device connected to this port, protected * by &drm_dp_mst_topology_mgr.base.lock. * @passthrough_aux: parent aux to which DSC pass-through requests should be * sent, only set if DSC pass-through is possible. * @parent: branch device parent of this port * @connector: DRM connector this port is connected to. Protected by * &drm_dp_mst_topology_mgr.base.lock. * @mgr: topology manager this port lives under. * * This structure represents an MST port endpoint on a device somewhere * in the MST topology.
*/ struct drm_dp_mst_port { /** * @topology_kref: refcount for this port's lifetime in the topology, * only the DP MST helpers should need to touch this
*/ struct kref topology_kref;
/** * @malloc_kref: refcount for the memory allocation containing this * structure. See drm_dp_mst_get_port_malloc() and * drm_dp_mst_put_port_malloc().
*/ struct kref malloc_kref;
#if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) /** * @topology_ref_history: A history of each topology * reference/dereference. See CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS.
*/ struct drm_dp_mst_topology_ref_history topology_ref_history; #endif
u8 port_num; bool input; bool mcs; bool ddps;
u8 pdt; bool ldps;
u8 dpcd_rev;
u8 num_sdp_streams;
u8 num_sdp_stream_sinks;
uint16_t full_pbn; struct list_head next; /** * @mstb: the branch device connected to this port, if there is one. * This should be considered protected for reading by * &drm_dp_mst_topology_mgr.lock. There are two exceptions to this: * &drm_dp_mst_topology_mgr.up_req_work and * &drm_dp_mst_topology_mgr.work, which do not grab * &drm_dp_mst_topology_mgr.lock during reads but are the only * updaters of this list and are protected from writing concurrently * by &drm_dp_mst_topology_mgr.probe_lock.
*/ struct drm_dp_mst_branch *mstb; struct drm_dp_aux aux; /* i2c bus for this port? */ struct drm_dp_aux *passthrough_aux; struct drm_dp_mst_branch *parent;
/** * @cached_edid: for DP logical ports - make tiling work by ensuring * that the EDID for all connectors is read immediately.
*/ conststruct drm_edid *cached_edid;
/** * @fec_capable: bool indicating if FEC can be supported up to that * point in the MST topology.
*/ bool fec_capable;
};
struct drm_dp_sideband_msg_rx {
u8 chunk[48];
u8 msg[256];
u8 curchunk_len;
u8 curchunk_idx; /* chunk we are parsing now */
u8 curchunk_hdrlen;
u8 curlen; /* total length of the msg */ bool have_somt; bool have_eomt; struct drm_dp_sideband_msg_hdr initial_hdr;
};
/** * struct drm_dp_mst_branch - MST branch device. * @rad: Relative Address to talk to this branch device. * @lct: Link count total to talk to this branch device. * @num_ports: number of ports on the branch. * @port_parent: pointer to the port parent, NULL if toplevel. * @mgr: topology manager for this branch device. * @link_address_sent: if a link address message has been sent to this device yet. * @guid: guid for DP 1.2 branch device. port under this branch can be * identified by port #. * * This structure represents an MST branch device, there is one * primary branch device at the root, along with any other branches connected * to downstream port of parent branches.
*/ struct drm_dp_mst_branch { /** * @topology_kref: refcount for this branch device's lifetime in the * topology, only the DP MST helpers should need to touch this
*/ struct kref topology_kref;
/** * @malloc_kref: refcount for the memory allocation containing this * structure. See drm_dp_mst_get_mstb_malloc() and * drm_dp_mst_put_mstb_malloc().
*/ struct kref malloc_kref;
#if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) /** * @topology_ref_history: A history of each topology * reference/dereference. See CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS.
*/ struct drm_dp_mst_topology_ref_history topology_ref_history; #endif
/** * @destroy_next: linked-list entry used by * drm_dp_delayed_destroy_work()
*/ struct list_head destroy_next;
/** * @rad: Relative Address of the MST branch. * For &drm_dp_mst_topology_mgr.mst_primary, it's rad[8] are all 0, * unset and unused. For MST branches connected after mst_primary, * in each element of rad[] the nibbles are ordered by the most * signifcant 4 bits first and the least significant 4 bits second.
*/
u8 rad[8];
u8 lct; int num_ports;
/** * @ports: the list of ports on this branch device. This should be * considered protected for reading by &drm_dp_mst_topology_mgr.lock. * There are two exceptions to this: * &drm_dp_mst_topology_mgr.up_req_work and * &drm_dp_mst_topology_mgr.work, which do not grab * &drm_dp_mst_topology_mgr.lock during reads but are the only * updaters of this list and are protected from updating the list * concurrently by @drm_dp_mst_topology_mgr.probe_lock
*/ struct list_head ports;
/* msg is queued to be put into a slot */ #define DRM_DP_SIDEBAND_TX_QUEUED 0 /* msg has started transmitting on a slot - still on msgq */ #define DRM_DP_SIDEBAND_TX_START_SEND 1 /* msg has finished transmitting on a slot - removed from msgq only in slot */ #define DRM_DP_SIDEBAND_TX_SENT 2 /* msg has received a response - removed from slot */ #define DRM_DP_SIDEBAND_TX_RX 3 #define DRM_DP_SIDEBAND_TX_TIMEOUT 4
/* sideband msg handler */ struct drm_dp_mst_topology_mgr; struct drm_dp_mst_topology_cbs { /* create a connector for a port */ struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, constchar *path); /* * Checks for any pending MST interrupts, passing them to MST core for * processing, the same way an HPD IRQ pulse handler would do this. * If provided MST core calls this callback from a poll-waiting loop * when waiting for MST down message replies. The driver is expected * to guard against a race between this callback and the driver's HPD * IRQ pulse handler.
*/ void (*poll_hpd_irq)(struct drm_dp_mst_topology_mgr *mgr);
};
/** * struct drm_dp_mst_atomic_payload - Atomic state struct for an MST payload * * The primary atomic state structure for a given MST payload. Stores information like current * bandwidth allocation, intended action for this payload, etc.
*/ struct drm_dp_mst_atomic_payload { /** @port: The MST port assigned to this payload */ struct drm_dp_mst_port *port;
/** * @vc_start_slot: The time slot that this payload starts on. Because payload start slots * can't be determined ahead of time, the contents of this value are UNDEFINED at atomic * check time. This shouldn't usually matter, as the start slot should never be relevant for * atomic state computations. * * Since this value is determined at commit time instead of check time, this value is * protected by the MST helpers ensuring that async commits operating on the given topology * never run in parallel. In the event that a driver does need to read this value (e.g. to * inform hardware of the starting timeslot for a payload), the driver may either: * * * Read this field during the atomic commit after * drm_dp_mst_atomic_wait_for_dependencies() has been called, which will ensure the * previous MST states payload start slots have been copied over to the new state. Note * that a new start slot won't be assigned/removed from this payload until * drm_dp_add_payload_part1()/drm_dp_remove_payload_part2() have been called. * * Acquire the MST modesetting lock, and then wait for any pending MST-related commits to * get committed to hardware by calling drm_crtc_commit_wait() on each of the * &drm_crtc_commit structs in &drm_dp_mst_topology_state.commit_deps. * * If neither of the two above solutions suffice (e.g. the driver needs to read the start * slot in the middle of an atomic commit without waiting for some reason), then drivers * should cache this value themselves after changing payloads.
*/
s8 vc_start_slot;
/** @vcpi: The Virtual Channel Payload Identifier */
u8 vcpi; /** * @time_slots: * The number of timeslots allocated to this payload from the source DP Tx to * the immediate downstream DP Rx
*/ int time_slots; /** @pbn: The payload bandwidth for this payload */ int pbn;
/** @delete: Whether or not we intend to delete this payload during this atomic commit */ booldelete : 1; /** @dsc_enabled: Whether or not this payload has DSC enabled */ bool dsc_enabled : 1;
/** @payload_allocation_status: The allocation status of this payload */ enum drm_dp_mst_payload_allocation payload_allocation_status;
/** @next: The list node for this payload */ struct list_head next;
};
/** * struct drm_dp_mst_topology_state - DisplayPort MST topology atomic state * * This struct represents the atomic state of the toplevel DisplayPort MST manager
*/ struct drm_dp_mst_topology_state { /** @base: Base private state for atomic */ struct drm_private_state base;
/** @mgr: The topology manager */ struct drm_dp_mst_topology_mgr *mgr;
/** * @pending_crtc_mask: A bitmask of all CRTCs this topology state touches, drivers may * modify this to add additional dependencies if needed.
*/
u32 pending_crtc_mask; /** * @commit_deps: A list of all CRTC commits affecting this topology, this field isn't * populated until drm_dp_mst_atomic_wait_for_dependencies() is called.
*/ struct drm_crtc_commit **commit_deps; /** @num_commit_deps: The number of CRTC commits in @commit_deps */
size_t num_commit_deps;
/** @payload_mask: A bitmask of allocated VCPIs, used for VCPI assignments */
u32 payload_mask; /** @payloads: The list of payloads being created/destroyed in this state */ struct list_head payloads;
/** @total_avail_slots: The total number of slots this topology can handle (63 or 64) */
u8 total_avail_slots; /** @start_slot: The first usable time slot in this topology (1 or 0) */
u8 start_slot;
/** * @pbn_div: The current PBN divisor for this topology. The driver is expected to fill this * out itself.
*/
fixed20_12 pbn_div;
};
/** * struct drm_dp_mst_topology_mgr - DisplayPort MST manager * * This struct represents the toplevel displayport MST topology manager. * There should be one instance of this for every MST capable DP connector * on the GPU.
*/ struct drm_dp_mst_topology_mgr { /** * @base: Base private object for atomic
*/ struct drm_private_obj base;
/** * @dev: device pointer for adding i2c devices etc.
*/ struct drm_device *dev; /** * @cbs: callbacks for connector addition and destruction.
*/ conststruct drm_dp_mst_topology_cbs *cbs; /** * @max_dpcd_transaction_bytes: maximum number of bytes to read/write * in one go.
*/ int max_dpcd_transaction_bytes; /** * @aux: AUX channel for the DP MST connector this topolgy mgr is * controlling.
*/ struct drm_dp_aux *aux; /** * @max_payloads: maximum number of payloads the GPU can generate.
*/ int max_payloads; /** * @conn_base_id: DRM connector ID this mgr is connected to. Only used * to build the MST connector path value.
*/ int conn_base_id;
/** * @up_req_recv: Message receiver state for up requests.
*/ struct drm_dp_sideband_msg_rx up_req_recv;
/** * @down_rep_recv: Message receiver state for replies to down * requests.
*/ struct drm_dp_sideband_msg_rx down_rep_recv;
/** * @probe_lock: Prevents @work and @up_req_work, the only writers of * &drm_dp_mst_port.mstb and &drm_dp_mst_branch.ports, from racing * while they update the topology.
*/ struct mutex probe_lock;
/** * @mst_state: If this manager is enabled for an MST capable port. False * if no MST sink/branch devices is connected.
*/ bool mst_state : 1;
/** * @payload_id_table_cleared: Whether or not we've cleared the payload * ID table for @mst_primary. Protected by @lock.
*/ bool payload_id_table_cleared : 1;
/** * @reset_rx_state: The down request's reply and up request message * receiver state must be reset, after the topology manager got * removed. Protected by @lock.
*/ bool reset_rx_state : 1;
/** * @payload_count: The number of currently active payloads in hardware. This value is only * intended to be used internally by MST helpers for payload tracking, and is only safe to * read/write from the atomic commit (not check) context.
*/
u8 payload_count;
/** * @next_start_slot: The starting timeslot to use for new VC payloads. This value is used * internally by MST helpers for payload tracking, and is only safe to read/write from the * atomic commit (not check) context.
*/
u8 next_start_slot;
/** * @mst_primary: Pointer to the primary/first branch device.
*/ struct drm_dp_mst_branch *mst_primary;
/** * @dpcd: Cache of DPCD for primary port.
*/
u8 dpcd[DP_RECEIVER_CAP_SIZE]; /** * @sink_count: Sink count from DEVICE_SERVICE_IRQ_VECTOR_ESI0.
*/
u8 sink_count;
/** * @tx_msg_downq: List of pending down requests
*/ struct list_head tx_msg_downq;
/** * @tx_waitq: Wait to queue stall for the tx worker.
*/
wait_queue_head_t tx_waitq; /** * @work: Probe work.
*/ struct work_struct work; /** * @tx_work: Sideband transmit worker. This can nest within the main * @work worker for each transaction @work launches.
*/ struct work_struct tx_work;
/** * @destroy_port_list: List of to be destroyed connectors.
*/ struct list_head destroy_port_list; /** * @destroy_branch_device_list: List of to be destroyed branch * devices.
*/ struct list_head destroy_branch_device_list; /** * @delayed_destroy_lock: Protects @destroy_port_list and * @destroy_branch_device_list.
*/ struct mutex delayed_destroy_lock;
/** * @delayed_destroy_wq: Workqueue used for delayed_destroy_work items. * A dedicated WQ makes it possible to drain any requeued work items * on it.
*/ struct workqueue_struct *delayed_destroy_wq;
/** * @delayed_destroy_work: Work item to destroy MST port and branch * devices, needed to avoid locking inversion.
*/ struct work_struct delayed_destroy_work;
/** * @up_req_list: List of pending up requests from the topology that * need to be processed, in chronological order.
*/ struct list_head up_req_list; /** * @up_req_lock: Protects @up_req_list
*/ struct mutex up_req_lock; /** * @up_req_work: Work item to process up requests received from the * topology. Needed to avoid blocking hotplug handling and sideband * transmissions.
*/ struct work_struct up_req_work;
int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, struct drm_device *dev, struct drm_dp_aux *aux, int max_dpcd_transaction_bytes, int max_payloads, int conn_base_id);
/** * enum drm_dp_mst_mode - sink's MST mode capability
*/ enum drm_dp_mst_mode { /** * @DRM_DP_SST: The sink does not support MST nor single stream sideband * messaging.
*/
DRM_DP_SST, /** * @DRM_DP_MST: Sink supports MST, more than one stream and single * stream sideband messaging.
*/
DRM_DP_MST, /** * @DRM_DP_SST_SIDEBAND_MSG: Sink supports only one stream and single * stream sideband messaging.
*/
DRM_DP_SST_SIDEBAND_MSG,
};
/** * __drm_dp_mst_state_iter_get - private atomic state iterator function for * macro-internal use * @state: &struct drm_atomic_state pointer * @mgr: pointer to the &struct drm_dp_mst_topology_mgr iteration cursor * @old_state: optional pointer to the old &struct drm_dp_mst_topology_state * iteration cursor * @new_state: optional pointer to the new &struct drm_dp_mst_topology_state * iteration cursor * @i: int iteration cursor, for macro-internal use * * Used by for_each_oldnew_mst_mgr_in_state(), * for_each_old_mst_mgr_in_state(), and for_each_new_mst_mgr_in_state(). Don't * call this directly. * * Returns: * True if the current &struct drm_private_obj is a &struct * drm_dp_mst_topology_mgr, false otherwise.
*/ staticinlinebool
__drm_dp_mst_state_iter_get(struct drm_atomic_state *state, struct drm_dp_mst_topology_mgr **mgr, struct drm_dp_mst_topology_state **old_state, struct drm_dp_mst_topology_state **new_state, int i)
{ struct __drm_private_objs_state *objs_state = &state->private_objs[i];
if (objs_state->ptr->funcs != &drm_dp_mst_topology_state_funcs) returnfalse;
*mgr = to_dp_mst_topology_mgr(objs_state->ptr); if (old_state)
*old_state = to_dp_mst_topology_state(objs_state->old_state); if (new_state)
*new_state = to_dp_mst_topology_state(objs_state->new_state);
returntrue;
}
/** * for_each_oldnew_mst_mgr_in_state - iterate over all DP MST topology * managers in an atomic update * @__state: &struct drm_atomic_state pointer * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor * @old_state: &struct drm_dp_mst_topology_state iteration cursor for the old * state * @new_state: &struct drm_dp_mst_topology_state iteration cursor for the new * state * @__i: int iteration cursor, for macro-internal use * * This iterates over all DRM DP MST topology managers in an atomic update, * tracking both old and new state. This is useful in places where the state * delta needs to be considered, for example in atomic check functions.
*/ #define for_each_oldnew_mst_mgr_in_state(__state, mgr, old_state, new_state, __i) \ for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \
for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), &(old_state), &(new_state), (__i)))
/** * for_each_old_mst_mgr_in_state - iterate over all DP MST topology managers * in an atomic update * @__state: &struct drm_atomic_state pointer * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor * @old_state: &struct drm_dp_mst_topology_state iteration cursor for the old * state * @__i: int iteration cursor, for macro-internal use * * This iterates over all DRM DP MST topology managers in an atomic update, * tracking only the old state. This is useful in disable functions, where we * need the old state the hardware is still in.
*/ #define for_each_old_mst_mgr_in_state(__state, mgr, old_state, __i) \ for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \
for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), &(old_state), NULL, (__i)))
/** * for_each_new_mst_mgr_in_state - iterate over all DP MST topology managers * in an atomic update * @__state: &struct drm_atomic_state pointer * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor * @new_state: &struct drm_dp_mst_topology_state iteration cursor for the new * state * @__i: int iteration cursor, for macro-internal use * * This iterates over all DRM DP MST topology managers in an atomic update, * tracking only the new state. This is useful in enable functions, where we * need the new state the hardware should be in when the atomic commit * operation has completed.
*/ #define for_each_new_mst_mgr_in_state(__state, mgr, new_state, __i) \ for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \
for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), NULL, &(new_state), (__i)))
#endif
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