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drm/mst: Support simultaneous down replies 

Currently we have one down reply message servicing the mst manager, so
we need to serialize all tx msgs to ensure we only have one message in
flight at a time. For obvious reasons this is suboptimal (but less
suboptimal than the free-for-all we had before serialization).

This patch removes the single down_rep_recv message from manager and
adds 2 replies in the branch structure. The 2 replies mirrors the tx_slots
which we use to rate-limit outgoing messages and correspond to seqno in
the packet headers.

Cc: Wayne Lin <Wayne.Lin@amd.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Wayne Lin <waynelin@amd.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200213211523.156998-3-sean@poorly.run
This commit is contained in:
Sean Paul 2020-02-13 16:15:19 -05:00
parent 21a729d007
commit fbc821c4a5
2 changed files with 78 additions and 61 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

80
drivers/gpu/drm/drm_dp_mst_topology.c
View File

@ -3696,7 +3696,8 @@ out_fail:
} }
EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume); EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume);
static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up) static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up,
struct drm_dp_mst_branch **mstb, int *seqno)
{ {
int len; int len;
u8 replyblock[32]; u8 replyblock[32];
@ -3708,7 +3709,8 @@ static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up)
int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE :
DP_SIDEBAND_MSG_DOWN_REP_BASE; DP_SIDEBAND_MSG_DOWN_REP_BASE;
msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv; *mstb = NULL;
*seqno = -1;
len = min(mgr->max_dpcd_transaction_bytes, 16); len = min(mgr->max_dpcd_transaction_bytes, 16);
ret = drm_dp_dpcd_read(mgr->aux, basereg, replyblock, len); ret = drm_dp_dpcd_read(mgr->aux, basereg, replyblock, len);
@ -3725,6 +3727,21 @@ static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up)
return false; return false;
} }
*seqno = hdr.seqno;
if (up) {
msg = &mgr->up_req_recv;
} else {
/* Caller is responsible for giving back this reference */
*mstb = drm_dp_get_mst_branch_device(mgr, hdr.lct, hdr.rad);
if (!*mstb) {
DRM_DEBUG_KMS("Got MST reply from unknown device %d\n",
hdr.lct);
return false;
}
msg = &(*mstb)->down_rep_recv[hdr.seqno];
}
if (!drm_dp_sideband_msg_set_header(msg, &hdr, hdrlen)) { if (!drm_dp_sideband_msg_set_header(msg, &hdr, hdrlen)) {
DRM_DEBUG_KMS("sideband msg set header failed %d\n", DRM_DEBUG_KMS("sideband msg set header failed %d\n",
replyblock[0]); replyblock[0]);
@ -3765,53 +3782,52 @@ static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up)
static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr)
{ {
struct drm_dp_sideband_msg_tx *txmsg; struct drm_dp_sideband_msg_tx *txmsg;
struct drm_dp_mst_branch *mstb; struct drm_dp_mst_branch *mstb = NULL;
struct drm_dp_sideband_msg_hdr *hdr = &mgr->down_rep_recv.initial_hdr; struct drm_dp_sideband_msg_rx *msg = NULL;
int slot = -1; int seqno = -1;
if (!drm_dp_get_one_sb_msg(mgr, false)) if (!drm_dp_get_one_sb_msg(mgr, false, &mstb, &seqno))
goto clear_down_rep_recv; goto out_clear_reply;
if (!mgr->down_rep_recv.have_eomt) msg = &mstb->down_rep_recv[seqno];
return 0;
mstb = drm_dp_get_mst_branch_device(mgr, hdr->lct, hdr->rad); /* Multi-packet message transmission, don't clear the reply */
if (!mstb) { if (!msg->have_eomt)
DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", goto out;
hdr->lct);
goto clear_down_rep_recv;
}
/* find the message */ /* find the message */
slot = hdr->seqno;
mutex_lock(&mgr->qlock); mutex_lock(&mgr->qlock);
txmsg = mstb->tx_slots[slot]; txmsg = mstb->tx_slots[seqno];
/* remove from slots */ /* remove from slots */
mutex_unlock(&mgr->qlock); mutex_unlock(&mgr->qlock);
if (!txmsg) { if (!txmsg) {
struct drm_dp_sideband_msg_hdr *hdr;
hdr = &msg->initial_hdr;
DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n", DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n",
mstb, hdr->seqno, hdr->lct, hdr->rad[0], mstb, hdr->seqno, hdr->lct, hdr->rad[0],
mgr->down_rep_recv.msg[0]); msg->msg[0]);
goto no_msg; goto out_clear_reply;
} }
drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply); drm_dp_sideband_parse_reply(msg, &txmsg->reply);
if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {
DRM_DEBUG_KMS("Got NAK reply: req 0x%02x (%s), reason 0x%02x (%s), nak data 0x%02x\n", DRM_DEBUG_KMS("Got NAK reply: req 0x%02x (%s), reason 0x%02x (%s), nak data 0x%02x\n",
txmsg->reply.req_type, txmsg->reply.req_type,
drm_dp_mst_req_type_str(txmsg->reply.req_type), drm_dp_mst_req_type_str(txmsg->reply.req_type),
txmsg->reply.u.nak.reason, txmsg->reply.u.nak.reason,
drm_dp_mst_nak_reason_str(txmsg->reply.u.nak.reason), drm_dp_mst_nak_reason_str(txmsg->reply.u.nak.reason),
txmsg->reply.u.nak.nak_data); txmsg->reply.u.nak.nak_data);
goto out_clear_reply;
}
memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); memset(msg, 0, sizeof(struct drm_dp_sideband_msg_rx));
drm_dp_mst_topology_put_mstb(mstb); drm_dp_mst_topology_put_mstb(mstb);
mutex_lock(&mgr->qlock); mutex_lock(&mgr->qlock);
txmsg->state = DRM_DP_SIDEBAND_TX_RX; txmsg->state = DRM_DP_SIDEBAND_TX_RX;
mstb->tx_slots[slot] = NULL; mstb->tx_slots[seqno] = NULL;
mgr->is_waiting_for_dwn_reply = false; mgr->is_waiting_for_dwn_reply = false;
mutex_unlock(&mgr->qlock); mutex_unlock(&mgr->qlock);
@ -3819,13 +3835,15 @@ static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr)
return 0; return 0;
no_msg: out_clear_reply:
drm_dp_mst_topology_put_mstb(mstb);
clear_down_rep_recv:
mutex_lock(&mgr->qlock); mutex_lock(&mgr->qlock);
mgr->is_waiting_for_dwn_reply = false; mgr->is_waiting_for_dwn_reply = false;
mutex_unlock(&mgr->qlock); mutex_unlock(&mgr->qlock);
memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); if (msg)
memset(msg, 0, sizeof(struct drm_dp_sideband_msg_rx));
out:
if (mstb)
drm_dp_mst_topology_put_mstb(mstb);
return 0; return 0;
} }
@ -3901,11 +3919,10 @@ static void drm_dp_mst_up_req_work(struct work_struct *work)
static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
{ {
struct drm_dp_sideband_msg_hdr *hdr = &mgr->up_req_recv.initial_hdr;
struct drm_dp_pending_up_req *up_req; struct drm_dp_pending_up_req *up_req;
bool seqno; int seqno;
if (!drm_dp_get_one_sb_msg(mgr, true)) if (!drm_dp_get_one_sb_msg(mgr, true, NULL, &seqno))
goto out; goto out;
if (!mgr->up_req_recv.have_eomt) if (!mgr->up_req_recv.have_eomt)
@ -3918,7 +3935,6 @@ static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
} }
INIT_LIST_HEAD(&up_req->next); INIT_LIST_HEAD(&up_req->next);
seqno = hdr->seqno;
drm_dp_sideband_parse_req(&mgr->up_req_recv, &up_req->msg); drm_dp_sideband_parse_req(&mgr->up_req_recv, &up_req->msg);
if (up_req->msg.req_type != DP_CONNECTION_STATUS_NOTIFY && if (up_req->msg.req_type != DP_CONNECTION_STATUS_NOTIFY &&
@ -3952,7 +3968,7 @@ static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
res_stat->available_pbn); res_stat->available_pbn);
} }
up_req->hdr = *hdr; up_req->hdr = mgr->up_req_recv.initial_hdr;
mutex_lock(&mgr->up_req_lock); mutex_lock(&mgr->up_req_lock);
list_add_tail(&up_req->next, &mgr->up_req_list); list_add_tail(&up_req->next, &mgr->up_req_list);
mutex_unlock(&mgr->up_req_lock); mutex_unlock(&mgr->up_req_lock);

59
include/drm/drm_dp_mst_helper.h
View File

@ -160,6 +160,31 @@ struct drm_dp_mst_port {
bool fec_capable; bool fec_capable;
}; };
/* sideband msg header - not bit struct */
struct drm_dp_sideband_msg_hdr {
u8 lct;
u8 lcr;
u8 rad[8];
bool broadcast;
bool path_msg;
u8 msg_len;
bool somt;
bool eomt;
bool seqno;
};
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. * struct drm_dp_mst_branch - MST branch device.
* @rad: Relative Address to talk to this branch device. * @rad: Relative Address to talk to this branch device.
@ -232,24 +257,16 @@ struct drm_dp_mst_branch {
int last_seqno; int last_seqno;
bool link_address_sent; bool link_address_sent;
/**
* @down_rep_recv: Message receiver state for down replies.
*/
struct drm_dp_sideband_msg_rx down_rep_recv[2];
/* global unique identifier to identify branch devices */ /* global unique identifier to identify branch devices */
u8 guid[16]; u8 guid[16];
}; };
/* sideband msg header - not bit struct */
struct drm_dp_sideband_msg_hdr {
u8 lct;
u8 lcr;
u8 rad[8];
bool broadcast;
bool path_msg;
u8 msg_len;
bool somt;
bool eomt;
bool seqno;
};
struct drm_dp_nak_reply { struct drm_dp_nak_reply {
u8 guid[16]; u8 guid[16];
u8 reason; u8 reason;
@ -306,18 +323,6 @@ struct drm_dp_remote_i2c_write_ack_reply {
}; };
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;
};
#define DRM_DP_MAX_SDP_STREAMS 16 #define DRM_DP_MAX_SDP_STREAMS 16
struct drm_dp_allocate_payload { struct drm_dp_allocate_payload {
u8 port_number; u8 port_number;
@ -555,10 +560,6 @@ struct drm_dp_mst_topology_mgr {
*/ */
int conn_base_id; int conn_base_id;
/**
* @down_rep_recv: Message receiver state for down replies.
*/
struct drm_dp_sideband_msg_rx down_rep_recv;
/** /**
* @up_req_recv: Message receiver state for up requests. * @up_req_recv: Message receiver state for up requests.
*/ */