On 2020-06-23 at 21:29:05 +0530, Sean Paul wrote: Hi Sean, I am new to DP MST stuff, I am looking to DP MST spec DP v1.2a. I have looked the entire series, i will take up this opportunity to review the series from HDCP over DP MST POV. I think theoretically this series should work or Gen12 as well, as DP MST streams are getting encrypted by QUERY_STREAM_ENCRYPTION_STATUS reply tranaction msg (generating Stream State Signature L’). I will test this on Gen12 H/W with DP MST support and will provide my inputs. Meanwhile while going through DP MST v1.2a specs(Page 262) came to know about a DP irq vector LINK_SERVICE_IRQ_VECTOR_ESI0 (02005h), Bit 2 : STREAM_STATUS_CHANGED. When this bit set to ‘1’ indicates the source must re-check the Stream Status with the QUERY_STREAM_ENCRYPTION_STATUS message. Currently i feel this irq support is missing, do we require to support above IRQ vector for DP MST stream encryption. Thanks, Anshuman Gupta. > From: Sean Paul <seanpaul@xxxxxxxxxxxx> > > Used to query whether an MST stream is encrypted or not. > > Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx> > > Link: https://patchwork.freedesktop.org/patch/msgid/20200218220242.107265-14-sean@xxxxxxxxxx #v4 > Link: https://patchwork.freedesktop.org/patch/msgid/20200305201236.152307-15-sean@xxxxxxxxxx #v5 > Link: https://patchwork.freedesktop.org/patch/msgid/20200429195502.39919-15-sean@xxxxxxxxxx #v6 > > Changes in v4: > -Added to the set > Changes in v5: > -None > Changes in v6: > -Use FIELD_PREP to generate request buffer bitfields (Lyude) > -Add mst selftest and dump/decode_sideband_req for QSES (Lyude) > Changes in v7: > -None > --- > drivers/gpu/drm/drm_dp_mst_topology.c | 142 ++++++++++++++++++ > .../drm/selftests/test-drm_dp_mst_helper.c | 17 +++ > include/drm/drm_dp_helper.h | 3 + > include/drm/drm_dp_mst_helper.h | 44 ++++++ > 4 files changed, 206 insertions(+) > > diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c > index b2f5a84b4cfb..fc68478eaeb4 100644 > --- a/drivers/gpu/drm/drm_dp_mst_topology.c > +++ b/drivers/gpu/drm/drm_dp_mst_topology.c > @@ -20,11 +20,13 @@ > * OF THIS SOFTWARE. > */ > > +#include <linux/bitfield.h> > #include <linux/delay.h> > #include <linux/errno.h> > #include <linux/i2c.h> > #include <linux/init.h> > #include <linux/kernel.h> > +#include <linux/random.h> > #include <linux/sched.h> > #include <linux/seq_file.h> > #include <linux/iopoll.h> > @@ -419,6 +421,22 @@ drm_dp_encode_sideband_req(const struct drm_dp_sideband_msg_req_body *req, > memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes); > idx += req->u.i2c_write.num_bytes; > break; > + case DP_QUERY_STREAM_ENC_STATUS: { > + const struct drm_dp_query_stream_enc_status *msg; > + > + msg = &req->u.enc_status; > + buf[idx] = msg->stream_id; > + idx++; > + memcpy(&buf[idx], msg->client_id, sizeof(msg->client_id)); > + idx += sizeof(msg->client_id); > + buf[idx] = 0; > + buf[idx] |= FIELD_PREP(GENMASK(1, 0), msg->stream_event); > + buf[idx] |= msg->valid_stream_event ? BIT(2) : 0; > + buf[idx] |= FIELD_PREP(GENMASK(4, 3), msg->stream_behavior); > + buf[idx] |= msg->valid_stream_behavior ? BIT(5) : 0; > + idx++; > + } > + break; > } > raw->cur_len = idx; > } > @@ -547,6 +565,20 @@ drm_dp_decode_sideband_req(const struct drm_dp_sideband_msg_tx *raw, > return -ENOMEM; > } > break; > + case DP_QUERY_STREAM_ENC_STATUS: > + req->u.enc_status.stream_id = buf[idx++]; > + for (i = 0; i < sizeof(req->u.enc_status.client_id); i++) > + req->u.enc_status.client_id[i] = buf[idx++]; > + > + req->u.enc_status.stream_event = FIELD_GET(GENMASK(1, 0), > + buf[idx]); > + req->u.enc_status.valid_stream_event = FIELD_GET(BIT(2), > + buf[idx]); > + req->u.enc_status.stream_behavior = FIELD_GET(GENMASK(4, 3), > + buf[idx]); > + req->u.enc_status.valid_stream_behavior = FIELD_GET(BIT(5), > + buf[idx]); > + break; > } > > return 0; > @@ -625,6 +657,16 @@ drm_dp_dump_sideband_msg_req_body(const struct drm_dp_sideband_msg_req_body *req > req->u.i2c_write.num_bytes, req->u.i2c_write.num_bytes, > req->u.i2c_write.bytes); > break; > + case DP_QUERY_STREAM_ENC_STATUS: > + P("stream_id=%u client_id=%*ph stream_event=%x " > + "valid_event=%d stream_behavior=%x valid_behavior=%d", > + req->u.enc_status.stream_id, > + (int)ARRAY_SIZE(req->u.enc_status.client_id), > + req->u.enc_status.client_id, req->u.enc_status.stream_event, > + req->u.enc_status.valid_stream_event, > + req->u.enc_status.stream_behavior, > + req->u.enc_status.valid_stream_behavior); > + break; > default: > P("???\n"); > break; > @@ -925,6 +967,34 @@ static bool drm_dp_sideband_parse_power_updown_phy_ack(struct drm_dp_sideband_ms > return true; > } > > +static bool > +drm_dp_sideband_parse_query_stream_enc_status( > + struct drm_dp_sideband_msg_rx *raw, > + struct drm_dp_sideband_msg_reply_body *repmsg) > +{ > + struct drm_dp_query_stream_enc_status_ack_reply *reply; > + > + reply = &repmsg->u.enc_status; > + > + reply->stream_id = raw->msg[3]; > + > + reply->reply_signed = raw->msg[2] & BIT(0); > + > + reply->hdcp_1x_device_present = raw->msg[2] & BIT(3); > + reply->hdcp_2x_device_present = raw->msg[2] & BIT(4); > + > + reply->query_capable_device_present = raw->msg[2] & BIT(5); > + reply->legacy_device_present = raw->msg[2] & BIT(6); > + reply->unauthorizable_device_present = raw->msg[2] & BIT(7); > + > + reply->auth_completed = !!(raw->msg[1] & BIT(3)); > + reply->encryption_enabled = !!(raw->msg[1] & BIT(4)); > + reply->repeater_present = !!(raw->msg[1] & BIT(5)); > + reply->state = (raw->msg[1] & GENMASK(7, 6)) >> 6; > + > + return true; > +} > + > static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw, > struct drm_dp_sideband_msg_reply_body *msg) > { > @@ -959,6 +1029,8 @@ static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw, > return drm_dp_sideband_parse_power_updown_phy_ack(raw, msg); > case DP_CLEAR_PAYLOAD_ID_TABLE: > return true; /* since there's nothing to parse */ > + case DP_QUERY_STREAM_ENC_STATUS: > + return drm_dp_sideband_parse_query_stream_enc_status(raw, msg); > default: > DRM_ERROR("Got unknown reply 0x%02x (%s)\n", msg->req_type, > drm_dp_mst_req_type_str(msg->req_type)); > @@ -1109,6 +1181,25 @@ static void build_power_updown_phy(struct drm_dp_sideband_msg_tx *msg, > msg->path_msg = true; > } > > +static int > +build_query_stream_enc_status(struct drm_dp_sideband_msg_tx *msg, u8 stream_id, > + u8 *q_id) > +{ > + struct drm_dp_sideband_msg_req_body req; > + > + req.req_type = DP_QUERY_STREAM_ENC_STATUS; > + req.u.enc_status.stream_id = stream_id; > + memcpy(req.u.enc_status.client_id, q_id, > + sizeof(req.u.enc_status.client_id)); > + req.u.enc_status.stream_event = 0; > + req.u.enc_status.valid_stream_event = false; > + req.u.enc_status.stream_behavior = 0; > + req.u.enc_status.valid_stream_behavior = false; > + > + drm_dp_encode_sideband_req(&req, msg); > + return 0; > +} > + > static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr, > struct drm_dp_vcpi *vcpi) > { > @@ -3137,6 +3228,57 @@ int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr, > } > EXPORT_SYMBOL(drm_dp_send_power_updown_phy); > > +int drm_dp_send_query_stream_enc_status(struct drm_dp_mst_topology_mgr *mgr, > + struct drm_dp_mst_port *port, > + struct drm_dp_query_stream_enc_status_ack_reply *status) > +{ > + struct drm_dp_sideband_msg_tx *txmsg; > + u8 nonce[7]; > + int len, ret; > + > + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); > + if (!txmsg) > + return -ENOMEM; > + > + port = drm_dp_mst_topology_get_port_validated(mgr, port); > + if (!port) { > + ret = -EINVAL; > + goto out_get_port; > + } > + > + get_random_bytes(nonce, sizeof(nonce)); > + > + /* > + * "Source device targets the QUERY_STREAM_ENCRYPTION_STATUS message > + * transaction at the MST Branch device directly connected to the > + * Source" > + */ > + txmsg->dst = mgr->mst_primary; > + > + len = build_query_stream_enc_status(txmsg, port->vcpi.vcpi, nonce); > + > + drm_dp_queue_down_tx(mgr, txmsg); > + > + ret = drm_dp_mst_wait_tx_reply(mgr->mst_primary, txmsg); > + if (ret < 0) { > + goto out; > + } else if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) { > + DRM_DEBUG_KMS("query encryption status nak received\n"); > + ret = -ENXIO; > + goto out; > + } > + > + ret = 0; > + memcpy(status, &txmsg->reply.u.enc_status, sizeof(*status)); > + > +out: > + drm_dp_mst_topology_put_port(port); > +out_get_port: > + kfree(txmsg); > + return ret; > +} > +EXPORT_SYMBOL(drm_dp_send_query_stream_enc_status); > + > static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr, > int id, > struct drm_dp_payload *payload) > diff --git a/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c b/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c > index bd990d178765..1d696ec001cf 100644 > --- a/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c > +++ b/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c > @@ -5,6 +5,8 @@ > > #define PREFIX_STR "[drm_dp_mst_helper]" > > +#include <linux/random.h> > + > #include <drm/drm_dp_mst_helper.h> > #include <drm/drm_print.h> > > @@ -237,6 +239,21 @@ int igt_dp_mst_sideband_msg_req_decode(void *unused) > in.u.i2c_write.bytes = data; > DO_TEST(); > > + in.req_type = DP_QUERY_STREAM_ENC_STATUS; > + in.u.enc_status.stream_id = 1; > + DO_TEST(); > + get_random_bytes(in.u.enc_status.client_id, > + sizeof(in.u.enc_status.client_id)); > + DO_TEST(); > + in.u.enc_status.stream_event = 3; > + DO_TEST(); > + in.u.enc_status.valid_stream_event = 0; > + DO_TEST(); > + in.u.enc_status.stream_behavior = 3; > + DO_TEST(); > + in.u.enc_status.valid_stream_behavior = 1; > + DO_TEST(); > + > #undef DO_TEST > return 0; > } > diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h > index e47dc22ebf50..e2d2df5e869e 100644 > --- a/include/drm/drm_dp_helper.h > +++ b/include/drm/drm_dp_helper.h > @@ -1108,6 +1108,9 @@ > #define DP_POWER_DOWN_PHY 0x25 > #define DP_SINK_EVENT_NOTIFY 0x30 > #define DP_QUERY_STREAM_ENC_STATUS 0x38 > +#define DP_QUERY_STREAM_ENC_STATUS_STATE_NO_EXIST 0 > +#define DP_QUERY_STREAM_ENC_STATUS_STATE_INACTIVE 1 > +#define DP_QUERY_STREAM_ENC_STATUS_STATE_ACTIVE 2 > > /* DP 1.2 MST sideband reply types */ > #define DP_SIDEBAND_REPLY_ACK 0x00 > diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h > index 8b9eb4db3381..371eef8798ad 100644 > --- a/include/drm/drm_dp_mst_helper.h > +++ b/include/drm/drm_dp_mst_helper.h > @@ -313,6 +313,34 @@ struct drm_dp_remote_i2c_write_ack_reply { > u8 port_number; > }; > > +struct drm_dp_query_stream_enc_status_ack_reply { > + /* Bit[23:16]- Stream Id */ > + u8 stream_id; > + > + /* Bit[15]- Signed */ > + bool reply_signed; > + > + /* Bit[10:8]- Stream Output Sink Type */ > + bool unauthorizable_device_present; > + bool legacy_device_present; > + bool query_capable_device_present; > + > + /* Bit[12:11]- Stream Output CP Type */ > + bool hdcp_1x_device_present; > + bool hdcp_2x_device_present; > + > + /* Bit[4]- Stream Authentication */ > + bool auth_completed; > + > + /* Bit[3]- Stream Encryption */ > + bool encryption_enabled; > + > + /* Bit[2]- Stream Repeater Function Present */ > + bool repeater_present; > + > + /* Bit[1:0]- Stream State */ > + u8 state; > +}; > > #define DRM_DP_MAX_SDP_STREAMS 16 > struct drm_dp_allocate_payload { > @@ -374,6 +402,15 @@ struct drm_dp_remote_i2c_write { > u8 *bytes; > }; > > +struct drm_dp_query_stream_enc_status { > + u8 stream_id; > + u8 client_id[7]; /* 56-bit nonce */ > + u8 stream_event; > + bool valid_stream_event; > + u8 stream_behavior; > + u8 valid_stream_behavior; > +}; > + > /* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */ > struct drm_dp_port_number_req { > u8 port_number; > @@ -422,6 +459,8 @@ struct drm_dp_sideband_msg_req_body { > > struct drm_dp_remote_i2c_read i2c_read; > struct drm_dp_remote_i2c_write i2c_write; > + > + struct drm_dp_query_stream_enc_status enc_status; > } u; > }; > > @@ -444,6 +483,8 @@ struct drm_dp_sideband_msg_reply_body { > struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack; > struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack; > struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack; > + > + struct drm_dp_query_stream_enc_status_ack_reply enc_status; > } u; > }; > > @@ -808,6 +849,9 @@ drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state, > struct drm_dp_mst_port *port); > int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr, > struct drm_dp_mst_port *port, bool power_up); > +int drm_dp_send_query_stream_enc_status(struct drm_dp_mst_topology_mgr *mgr, > + struct drm_dp_mst_port *port, > + struct drm_dp_query_stream_enc_status_ack_reply *status); > int __must_check drm_dp_mst_atomic_check(struct drm_atomic_state *state); > > void drm_dp_mst_get_port_malloc(struct drm_dp_mst_port *port); > -- > Sean Paul, Software Engineer, Google / Chromium OS > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/intel-gfx _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
