| /* |
| * Copyright © 2014 Red Hat |
| * |
| * Permission to use, copy, modify, distribute, and sell this software and its |
| * documentation for any purpose is hereby granted without fee, provided that |
| * the above copyright notice appear in all copies and that both that copyright |
| * notice and this permission notice appear in supporting documentation, and |
| * that the name of the copyright holders not be used in advertising or |
| * publicity pertaining to distribution of the software without specific, |
| * written prior permission. The copyright holders make no representations |
| * about the suitability of this software for any purpose. It is provided "as |
| * is" without express or implied warranty. |
| * |
| * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
| * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
| * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
| * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, |
| * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
| * OF THIS SOFTWARE. |
| */ |
| |
| #include <linux/delay.h> |
| #include <linux/errno.h> |
| #include <linux/i2c.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/seq_file.h> |
| #include <linux/iopoll.h> |
| |
| #include <drm/drm_atomic.h> |
| #include <drm/drm_atomic_helper.h> |
| #include <drm/drm_dp_mst_helper.h> |
| #include <drm/drm_drv.h> |
| #include <drm/drm_fixed.h> |
| #include <drm/drm_print.h> |
| #include <drm/drm_probe_helper.h> |
| |
| #include "drm_crtc_helper_internal.h" |
| |
| /** |
| * DOC: dp mst helper |
| * |
| * These functions contain parts of the DisplayPort 1.2a MultiStream Transport |
| * protocol. The helpers contain a topology manager and bandwidth manager. |
| * The helpers encapsulate the sending and received of sideband msgs. |
| */ |
| static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, |
| char *buf); |
| static int test_calc_pbn_mode(void); |
| |
| static void drm_dp_mst_topology_put_port(struct drm_dp_mst_port *port); |
| |
| static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, |
| int id, |
| struct drm_dp_payload *payload); |
| |
| static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_mst_port *port, |
| int offset, int size, u8 *bytes); |
| static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_mst_port *port, |
| int offset, int size, u8 *bytes); |
| |
| static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_mst_branch *mstb); |
| static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_mst_branch *mstb, |
| struct drm_dp_mst_port *port); |
| static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, |
| u8 *guid); |
| |
| static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux); |
| static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux); |
| static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr); |
| |
| #define DP_STR(x) [DP_ ## x] = #x |
| |
| static const char *drm_dp_mst_req_type_str(u8 req_type) |
| { |
| static const char * const req_type_str[] = { |
| DP_STR(GET_MSG_TRANSACTION_VERSION), |
| DP_STR(LINK_ADDRESS), |
| DP_STR(CONNECTION_STATUS_NOTIFY), |
| DP_STR(ENUM_PATH_RESOURCES), |
| DP_STR(ALLOCATE_PAYLOAD), |
| DP_STR(QUERY_PAYLOAD), |
| DP_STR(RESOURCE_STATUS_NOTIFY), |
| DP_STR(CLEAR_PAYLOAD_ID_TABLE), |
| DP_STR(REMOTE_DPCD_READ), |
| DP_STR(REMOTE_DPCD_WRITE), |
| DP_STR(REMOTE_I2C_READ), |
| DP_STR(REMOTE_I2C_WRITE), |
| DP_STR(POWER_UP_PHY), |
| DP_STR(POWER_DOWN_PHY), |
| DP_STR(SINK_EVENT_NOTIFY), |
| DP_STR(QUERY_STREAM_ENC_STATUS), |
| }; |
| |
| if (req_type >= ARRAY_SIZE(req_type_str) || |
| !req_type_str[req_type]) |
| return "unknown"; |
| |
| return req_type_str[req_type]; |
| } |
| |
| #undef DP_STR |
| #define DP_STR(x) [DP_NAK_ ## x] = #x |
| |
| static const char *drm_dp_mst_nak_reason_str(u8 nak_reason) |
| { |
| static const char * const nak_reason_str[] = { |
| DP_STR(WRITE_FAILURE), |
| DP_STR(INVALID_READ), |
| DP_STR(CRC_FAILURE), |
| DP_STR(BAD_PARAM), |
| DP_STR(DEFER), |
| DP_STR(LINK_FAILURE), |
| DP_STR(NO_RESOURCES), |
| DP_STR(DPCD_FAIL), |
| DP_STR(I2C_NAK), |
| DP_STR(ALLOCATE_FAIL), |
| }; |
| |
| if (nak_reason >= ARRAY_SIZE(nak_reason_str) || |
| !nak_reason_str[nak_reason]) |
| return "unknown"; |
| |
| return nak_reason_str[nak_reason]; |
| } |
| |
| #undef DP_STR |
| |
| /* sideband msg handling */ |
| static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles) |
| { |
| u8 bitmask = 0x80; |
| u8 bitshift = 7; |
| u8 array_index = 0; |
| int number_of_bits = num_nibbles * 4; |
| u8 remainder = 0; |
| |
| while (number_of_bits != 0) { |
| number_of_bits--; |
| remainder <<= 1; |
| remainder |= (data[array_index] & bitmask) >> bitshift; |
| bitmask >>= 1; |
| bitshift--; |
| if (bitmask == 0) { |
| bitmask = 0x80; |
| bitshift = 7; |
| array_index++; |
| } |
| if ((remainder & 0x10) == 0x10) |
| remainder ^= 0x13; |
| } |
| |
| number_of_bits = 4; |
| while (number_of_bits != 0) { |
| number_of_bits--; |
| remainder <<= 1; |
| if ((remainder & 0x10) != 0) |
| remainder ^= 0x13; |
| } |
| |
| return remainder; |
| } |
| |
| static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes) |
| { |
| u8 bitmask = 0x80; |
| u8 bitshift = 7; |
| u8 array_index = 0; |
| int number_of_bits = number_of_bytes * 8; |
| u16 remainder = 0; |
| |
| while (number_of_bits != 0) { |
| number_of_bits--; |
| remainder <<= 1; |
| remainder |= (data[array_index] & bitmask) >> bitshift; |
| bitmask >>= 1; |
| bitshift--; |
| if (bitmask == 0) { |
| bitmask = 0x80; |
| bitshift = 7; |
| array_index++; |
| } |
| if ((remainder & 0x100) == 0x100) |
| remainder ^= 0xd5; |
| } |
| |
| number_of_bits = 8; |
| while (number_of_bits != 0) { |
| number_of_bits--; |
| remainder <<= 1; |
| if ((remainder & 0x100) != 0) |
| remainder ^= 0xd5; |
| } |
| |
| return remainder & 0xff; |
| } |
| static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr) |
| { |
| u8 size = 3; |
| size += (hdr->lct / 2); |
| return size; |
| } |
| |
| static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, |
| u8 *buf, int *len) |
| { |
| int idx = 0; |
| int i; |
| u8 crc4; |
| buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf); |
| for (i = 0; i < (hdr->lct / 2); i++) |
| buf[idx++] = hdr->rad[i]; |
| buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) | |
| (hdr->msg_len & 0x3f); |
| buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4); |
| |
| crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1); |
| buf[idx - 1] |= (crc4 & 0xf); |
| |
| *len = idx; |
| } |
| |
| static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, |
| u8 *buf, int buflen, u8 *hdrlen) |
| { |
| u8 crc4; |
| u8 len; |
| int i; |
| u8 idx; |
| if (buf[0] == 0) |
| return false; |
| len = 3; |
| len += ((buf[0] & 0xf0) >> 4) / 2; |
| if (len > buflen) |
| return false; |
| crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1); |
| |
| if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) { |
| DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]); |
| return false; |
| } |
| |
| hdr->lct = (buf[0] & 0xf0) >> 4; |
| hdr->lcr = (buf[0] & 0xf); |
| idx = 1; |
| for (i = 0; i < (hdr->lct / 2); i++) |
| hdr->rad[i] = buf[idx++]; |
| hdr->broadcast = (buf[idx] >> 7) & 0x1; |
| hdr->path_msg = (buf[idx] >> 6) & 0x1; |
| hdr->msg_len = buf[idx] & 0x3f; |
| idx++; |
| hdr->somt = (buf[idx] >> 7) & 0x1; |
| hdr->eomt = (buf[idx] >> 6) & 0x1; |
| hdr->seqno = (buf[idx] >> 4) & 0x1; |
| idx++; |
| *hdrlen = idx; |
| return true; |
| } |
| |
| static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req, |
| struct drm_dp_sideband_msg_tx *raw) |
| { |
| int idx = 0; |
| int i; |
| u8 *buf = raw->msg; |
| buf[idx++] = req->req_type & 0x7f; |
| |
| switch (req->req_type) { |
| case DP_ENUM_PATH_RESOURCES: |
| buf[idx] = (req->u.port_num.port_number & 0xf) << 4; |
| idx++; |
| break; |
| case DP_ALLOCATE_PAYLOAD: |
| buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 | |
| (req->u.allocate_payload.number_sdp_streams & 0xf); |
| idx++; |
| buf[idx] = (req->u.allocate_payload.vcpi & 0x7f); |
| idx++; |
| buf[idx] = (req->u.allocate_payload.pbn >> 8); |
| idx++; |
| buf[idx] = (req->u.allocate_payload.pbn & 0xff); |
| idx++; |
| for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) { |
| buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) | |
| (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf); |
| idx++; |
| } |
| if (req->u.allocate_payload.number_sdp_streams & 1) { |
| i = req->u.allocate_payload.number_sdp_streams - 1; |
| buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4; |
| idx++; |
| } |
| break; |
| case DP_QUERY_PAYLOAD: |
| buf[idx] = (req->u.query_payload.port_number & 0xf) << 4; |
| idx++; |
| buf[idx] = (req->u.query_payload.vcpi & 0x7f); |
| idx++; |
| break; |
| case DP_REMOTE_DPCD_READ: |
| buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4; |
| buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf; |
| idx++; |
| buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8; |
| idx++; |
| buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff); |
| idx++; |
| buf[idx] = (req->u.dpcd_read.num_bytes); |
| idx++; |
| break; |
| |
| case DP_REMOTE_DPCD_WRITE: |
| buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4; |
| buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf; |
| idx++; |
| buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8; |
| idx++; |
| buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff); |
| idx++; |
| buf[idx] = (req->u.dpcd_write.num_bytes); |
| idx++; |
| memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes); |
| idx += req->u.dpcd_write.num_bytes; |
| break; |
| case DP_REMOTE_I2C_READ: |
| buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4; |
| buf[idx] |= (req->u.i2c_read.num_transactions & 0x3); |
| idx++; |
| for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) { |
| buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f; |
| idx++; |
| buf[idx] = req->u.i2c_read.transactions[i].num_bytes; |
| idx++; |
| memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes); |
| idx += req->u.i2c_read.transactions[i].num_bytes; |
| |
| buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 4; |
| buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf); |
| idx++; |
| } |
| buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f; |
| idx++; |
| buf[idx] = (req->u.i2c_read.num_bytes_read); |
| idx++; |
| break; |
| |
| case DP_REMOTE_I2C_WRITE: |
| buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4; |
| idx++; |
| buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f; |
| idx++; |
| buf[idx] = (req->u.i2c_write.num_bytes); |
| idx++; |
| memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes); |
| idx += req->u.i2c_write.num_bytes; |
| break; |
| |
| case DP_POWER_DOWN_PHY: |
| case DP_POWER_UP_PHY: |
| buf[idx] = (req->u.port_num.port_number & 0xf) << 4; |
| idx++; |
| break; |
| } |
| raw->cur_len = idx; |
| } |
| |
| static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len) |
| { |
| u8 crc4; |
| crc4 = drm_dp_msg_data_crc4(msg, len); |
| msg[len] = crc4; |
| } |
| |
| static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep, |
| struct drm_dp_sideband_msg_tx *raw) |
| { |
| int idx = 0; |
| u8 *buf = raw->msg; |
| |
| buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f); |
| |
| raw->cur_len = idx; |
| } |
| |
| /* this adds a chunk of msg to the builder to get the final msg */ |
| static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg, |
| u8 *replybuf, u8 replybuflen, bool hdr) |
| { |
| int ret; |
| u8 crc4; |
| |
| if (hdr) { |
| u8 hdrlen; |
| struct drm_dp_sideband_msg_hdr recv_hdr; |
| ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen); |
| if (ret == false) { |
| print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false); |
| return false; |
| } |
| |
| /* |
| * ignore out-of-order messages or messages that are part of a |
| * failed transaction |
| */ |
| if (!recv_hdr.somt && !msg->have_somt) |
| return false; |
| |
| /* get length contained in this portion */ |
| msg->curchunk_len = recv_hdr.msg_len; |
| msg->curchunk_hdrlen = hdrlen; |
| |
| /* we have already gotten an somt - don't bother parsing */ |
| if (recv_hdr.somt && msg->have_somt) |
| return false; |
| |
| if (recv_hdr.somt) { |
| memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr)); |
| msg->have_somt = true; |
| } |
| if (recv_hdr.eomt) |
| msg->have_eomt = true; |
| |
| /* copy the bytes for the remainder of this header chunk */ |
| msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen)); |
| memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx); |
| } else { |
| memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen); |
| msg->curchunk_idx += replybuflen; |
| } |
| |
| if (msg->curchunk_idx >= msg->curchunk_len) { |
| /* do CRC */ |
| crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1); |
| /* copy chunk into bigger msg */ |
| memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1); |
| msg->curlen += msg->curchunk_len - 1; |
| } |
| return true; |
| } |
| |
| static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw, |
| struct drm_dp_sideband_msg_reply_body *repmsg) |
| { |
| int idx = 1; |
| int i; |
| memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16); |
| idx += 16; |
| repmsg->u.link_addr.nports = raw->msg[idx] & 0xf; |
| idx++; |
| if (idx > raw->curlen) |
| goto fail_len; |
| for (i = 0; i < repmsg->u.link_addr.nports; i++) { |
| if (raw->msg[idx] & 0x80) |
| repmsg->u.link_addr.ports[i].input_port = 1; |
| |
| repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7; |
| repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf); |
| |
| idx++; |
| if (idx > raw->curlen) |
| goto fail_len; |
| repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1; |
| repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1; |
| if (repmsg->u.link_addr.ports[i].input_port == 0) |
| repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1; |
| idx++; |
| if (idx > raw->curlen) |
| goto fail_len; |
| if (repmsg->u.link_addr.ports[i].input_port == 0) { |
| repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]); |
| idx++; |
| if (idx > raw->curlen) |
| goto fail_len; |
| memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16); |
| idx += 16; |
| if (idx > raw->curlen) |
| goto fail_len; |
| repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf; |
| repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf); |
| idx++; |
| |
| } |
| if (idx > raw->curlen) |
| goto fail_len; |
| } |
| |
| return true; |
| fail_len: |
| DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); |
| return false; |
| } |
| |
| static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw, |
| struct drm_dp_sideband_msg_reply_body *repmsg) |
| { |
| int idx = 1; |
| repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf; |
| idx++; |
| if (idx > raw->curlen) |
| goto fail_len; |
| repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx]; |
| idx++; |
| if (idx > raw->curlen) |
| goto fail_len; |
| |
| memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes); |
| return true; |
| fail_len: |
| DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); |
| return false; |
| } |
| |
| static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw, |
| struct drm_dp_sideband_msg_reply_body *repmsg) |
| { |
| int idx = 1; |
| repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf; |
| idx++; |
| if (idx > raw->curlen) |
| goto fail_len; |
| return true; |
| fail_len: |
| DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen); |
| return false; |
| } |
| |
| static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw, |
| struct drm_dp_sideband_msg_reply_body *repmsg) |
| { |
| int idx = 1; |
| |
| repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf); |
| idx++; |
| if (idx > raw->curlen) |
| goto fail_len; |
| repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx]; |
| idx++; |
| /* TODO check */ |
| memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes); |
| return true; |
| fail_len: |
| DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen); |
| return false; |
| } |
| |
| static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw, |
| struct drm_dp_sideband_msg_reply_body *repmsg) |
| { |
| int idx = 1; |
| repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf; |
| idx++; |
| if (idx > raw->curlen) |
| goto fail_len; |
| repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); |
| idx += 2; |
| if (idx > raw->curlen) |
| goto fail_len; |
| repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); |
| idx += 2; |
| if (idx > raw->curlen) |
| goto fail_len; |
| return true; |
| fail_len: |
| DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen); |
| return false; |
| } |
| |
| static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw, |
| struct drm_dp_sideband_msg_reply_body *repmsg) |
| { |
| int idx = 1; |
| repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf; |
| idx++; |
| if (idx > raw->curlen) |
| goto fail_len; |
| repmsg->u.allocate_payload.vcpi = raw->msg[idx]; |
| idx++; |
| if (idx > raw->curlen) |
| goto fail_len; |
| repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]); |
| idx += 2; |
| if (idx > raw->curlen) |
| goto fail_len; |
| return true; |
| fail_len: |
| DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen); |
| return false; |
| } |
| |
| static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw, |
| struct drm_dp_sideband_msg_reply_body *repmsg) |
| { |
| int idx = 1; |
| repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf; |
| idx++; |
| if (idx > raw->curlen) |
| goto fail_len; |
| repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); |
| idx += 2; |
| if (idx > raw->curlen) |
| goto fail_len; |
| return true; |
| fail_len: |
| DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen); |
| return false; |
| } |
| |
| static bool drm_dp_sideband_parse_power_updown_phy_ack(struct drm_dp_sideband_msg_rx *raw, |
| struct drm_dp_sideband_msg_reply_body *repmsg) |
| { |
| int idx = 1; |
| |
| repmsg->u.port_number.port_number = (raw->msg[idx] >> 4) & 0xf; |
| idx++; |
| if (idx > raw->curlen) { |
| DRM_DEBUG_KMS("power up/down phy parse length fail %d %d\n", |
| idx, raw->curlen); |
| return false; |
| } |
| return true; |
| } |
| |
| static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw, |
| struct drm_dp_sideband_msg_reply_body *msg) |
| { |
| memset(msg, 0, sizeof(*msg)); |
| msg->reply_type = (raw->msg[0] & 0x80) >> 7; |
| msg->req_type = (raw->msg[0] & 0x7f); |
| |
| if (msg->reply_type == DP_SIDEBAND_REPLY_NAK) { |
| memcpy(msg->u.nak.guid, &raw->msg[1], 16); |
| msg->u.nak.reason = raw->msg[17]; |
| msg->u.nak.nak_data = raw->msg[18]; |
| return false; |
| } |
| |
| switch (msg->req_type) { |
| case DP_LINK_ADDRESS: |
| return drm_dp_sideband_parse_link_address(raw, msg); |
| case DP_QUERY_PAYLOAD: |
| return drm_dp_sideband_parse_query_payload_ack(raw, msg); |
| case DP_REMOTE_DPCD_READ: |
| return drm_dp_sideband_parse_remote_dpcd_read(raw, msg); |
| case DP_REMOTE_DPCD_WRITE: |
| return drm_dp_sideband_parse_remote_dpcd_write(raw, msg); |
| case DP_REMOTE_I2C_READ: |
| return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg); |
| case DP_ENUM_PATH_RESOURCES: |
| return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg); |
| case DP_ALLOCATE_PAYLOAD: |
| return drm_dp_sideband_parse_allocate_payload_ack(raw, msg); |
| case DP_POWER_DOWN_PHY: |
| case DP_POWER_UP_PHY: |
| return drm_dp_sideband_parse_power_updown_phy_ack(raw, msg); |
| default: |
| DRM_ERROR("Got unknown reply 0x%02x (%s)\n", msg->req_type, |
| drm_dp_mst_req_type_str(msg->req_type)); |
| return false; |
| } |
| } |
| |
| static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw, |
| struct drm_dp_sideband_msg_req_body *msg) |
| { |
| int idx = 1; |
| |
| msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; |
| idx++; |
| if (idx > raw->curlen) |
| goto fail_len; |
| |
| memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16); |
| idx += 16; |
| if (idx > raw->curlen) |
| goto fail_len; |
| |
| msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1; |
| msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1; |
| msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1; |
| msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1; |
| msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7); |
| idx++; |
| return true; |
| fail_len: |
| DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen); |
| return false; |
| } |
| |
| static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw, |
| struct drm_dp_sideband_msg_req_body *msg) |
| { |
| int idx = 1; |
| |
| msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; |
| idx++; |
| if (idx > raw->curlen) |
| goto fail_len; |
| |
| memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16); |
| idx += 16; |
| if (idx > raw->curlen) |
| goto fail_len; |
| |
| msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); |
| idx++; |
| return true; |
| fail_len: |
| DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen); |
| return false; |
| } |
| |
| static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw, |
| struct drm_dp_sideband_msg_req_body *msg) |
| { |
| memset(msg, 0, sizeof(*msg)); |
| msg->req_type = (raw->msg[0] & 0x7f); |
| |
| switch (msg->req_type) { |
| case DP_CONNECTION_STATUS_NOTIFY: |
| return drm_dp_sideband_parse_connection_status_notify(raw, msg); |
| case DP_RESOURCE_STATUS_NOTIFY: |
| return drm_dp_sideband_parse_resource_status_notify(raw, msg); |
| default: |
| DRM_ERROR("Got unknown request 0x%02x (%s)\n", msg->req_type, |
| drm_dp_mst_req_type_str(msg->req_type)); |
| return false; |
| } |
| } |
| |
| static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes) |
| { |
| struct drm_dp_sideband_msg_req_body req; |
| |
| req.req_type = DP_REMOTE_DPCD_WRITE; |
| req.u.dpcd_write.port_number = port_num; |
| req.u.dpcd_write.dpcd_address = offset; |
| req.u.dpcd_write.num_bytes = num_bytes; |
| req.u.dpcd_write.bytes = bytes; |
| drm_dp_encode_sideband_req(&req, msg); |
| |
| return 0; |
| } |
| |
| static int build_link_address(struct drm_dp_sideband_msg_tx *msg) |
| { |
| struct drm_dp_sideband_msg_req_body req; |
| |
| req.req_type = DP_LINK_ADDRESS; |
| drm_dp_encode_sideband_req(&req, msg); |
| return 0; |
| } |
| |
| static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num) |
| { |
| struct drm_dp_sideband_msg_req_body req; |
| |
| req.req_type = DP_ENUM_PATH_RESOURCES; |
| req.u.port_num.port_number = port_num; |
| drm_dp_encode_sideband_req(&req, msg); |
| msg->path_msg = true; |
| return 0; |
| } |
| |
| static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num, |
| u8 vcpi, uint16_t pbn, |
| u8 number_sdp_streams, |
| u8 *sdp_stream_sink) |
| { |
| struct drm_dp_sideband_msg_req_body req; |
| memset(&req, 0, sizeof(req)); |
| req.req_type = DP_ALLOCATE_PAYLOAD; |
| req.u.allocate_payload.port_number = port_num; |
| req.u.allocate_payload.vcpi = vcpi; |
| req.u.allocate_payload.pbn = pbn; |
| req.u.allocate_payload.number_sdp_streams = number_sdp_streams; |
| memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink, |
| number_sdp_streams); |
| drm_dp_encode_sideband_req(&req, msg); |
| msg->path_msg = true; |
| return 0; |
| } |
| |
| static int build_power_updown_phy(struct drm_dp_sideband_msg_tx *msg, |
| int port_num, bool power_up) |
| { |
| struct drm_dp_sideband_msg_req_body req; |
| |
| if (power_up) |
| req.req_type = DP_POWER_UP_PHY; |
| else |
| req.req_type = DP_POWER_DOWN_PHY; |
| |
| req.u.port_num.port_number = port_num; |
| drm_dp_encode_sideband_req(&req, msg); |
| msg->path_msg = true; |
| return 0; |
| } |
| |
| static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_vcpi *vcpi) |
| { |
| int ret, vcpi_ret; |
| |
| mutex_lock(&mgr->payload_lock); |
| ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1); |
| if (ret > mgr->max_payloads) { |
| ret = -EINVAL; |
| DRM_DEBUG_KMS("out of payload ids %d\n", ret); |
| goto out_unlock; |
| } |
| |
| vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1); |
| if (vcpi_ret > mgr->max_payloads) { |
| ret = -EINVAL; |
| DRM_DEBUG_KMS("out of vcpi ids %d\n", ret); |
| goto out_unlock; |
| } |
| |
| set_bit(ret, &mgr->payload_mask); |
| set_bit(vcpi_ret, &mgr->vcpi_mask); |
| vcpi->vcpi = vcpi_ret + 1; |
| mgr->proposed_vcpis[ret - 1] = vcpi; |
| out_unlock: |
| mutex_unlock(&mgr->payload_lock); |
| return ret; |
| } |
| |
| static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr, |
| int vcpi) |
| { |
| int i; |
| if (vcpi == 0) |
| return; |
| |
| mutex_lock(&mgr->payload_lock); |
| DRM_DEBUG_KMS("putting payload %d\n", vcpi); |
| clear_bit(vcpi - 1, &mgr->vcpi_mask); |
| |
| for (i = 0; i < mgr->max_payloads; i++) { |
| if (mgr->proposed_vcpis[i]) |
| if (mgr->proposed_vcpis[i]->vcpi == vcpi) { |
| mgr->proposed_vcpis[i] = NULL; |
| clear_bit(i + 1, &mgr->payload_mask); |
| } |
| } |
| mutex_unlock(&mgr->payload_lock); |
| } |
| |
| static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_sideband_msg_tx *txmsg) |
| { |
| unsigned int state; |
| |
| /* |
| * All updates to txmsg->state are protected by mgr->qlock, and the two |
| * cases we check here are terminal states. For those the barriers |
| * provided by the wake_up/wait_event pair are enough. |
| */ |
| state = READ_ONCE(txmsg->state); |
| return (state == DRM_DP_SIDEBAND_TX_RX || |
| state == DRM_DP_SIDEBAND_TX_TIMEOUT); |
| } |
| |
| static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb, |
| struct drm_dp_sideband_msg_tx *txmsg) |
| { |
| struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; |
| int ret; |
| |
| ret = wait_event_timeout(mgr->tx_waitq, |
| check_txmsg_state(mgr, txmsg), |
| (4 * HZ)); |
| mutex_lock(&mstb->mgr->qlock); |
| if (ret > 0) { |
| if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) { |
| ret = -EIO; |
| goto out; |
| } |
| } else { |
| DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno); |
| |
| /* dump some state */ |
| ret = -EIO; |
| |
| /* remove from q */ |
| if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED || |
| txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) { |
| list_del(&txmsg->next); |
| } |
| |
| if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND || |
| txmsg->state == DRM_DP_SIDEBAND_TX_SENT) { |
| mstb->tx_slots[txmsg->seqno] = NULL; |
| } |
| } |
| out: |
| mutex_unlock(&mgr->qlock); |
| |
| return ret; |
| } |
| |
| static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad) |
| { |
| struct drm_dp_mst_branch *mstb; |
| |
| mstb = kzalloc(sizeof(*mstb), GFP_KERNEL); |
| if (!mstb) |
| return NULL; |
| |
| mstb->lct = lct; |
| if (lct > 1) |
| memcpy(mstb->rad, rad, lct / 2); |
| INIT_LIST_HEAD(&mstb->ports); |
| kref_init(&mstb->topology_kref); |
| kref_init(&mstb->malloc_kref); |
| return mstb; |
| } |
| |
| static void drm_dp_free_mst_branch_device(struct kref *kref) |
| { |
| struct drm_dp_mst_branch *mstb = |
| container_of(kref, struct drm_dp_mst_branch, malloc_kref); |
| |
| if (mstb->port_parent) |
| drm_dp_mst_put_port_malloc(mstb->port_parent); |
| |
| kfree(mstb); |
| } |
| |
| /** |
| * DOC: Branch device and port refcounting |
| * |
| * Topology refcount overview |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| * |
| * The refcounting schemes for &struct drm_dp_mst_branch and &struct |
| * drm_dp_mst_port are somewhat unusual. Both ports and branch devices have |
| * two different kinds of refcounts: topology refcounts, and malloc refcounts. |
| * |
| * Topology refcounts are not exposed to drivers, and are handled internally |
| * by the DP MST helpers. The helpers use them in order to prevent the |
| * in-memory topology state from being changed in the middle of critical |
| * operations like changing the internal state of payload allocations. This |
| * means each branch and port will be considered to be connected to the rest |
| * of the topology until its topology refcount reaches zero. Additionally, |
| * for ports this means that their associated &struct drm_connector will stay |
| * registered with userspace until the port's refcount reaches 0. |
| * |
| * Malloc refcount overview |
| * ~~~~~~~~~~~~~~~~~~~~~~~~ |
| * |
| * Malloc references are used to keep a &struct drm_dp_mst_port or &struct |
| * drm_dp_mst_branch allocated even after all of its topology references have |
| * been dropped, so that the driver or MST helpers can safely access each |
| * branch's last known state before it was disconnected from the topology. |
| * When the malloc refcount of a port or branch reaches 0, the memory |
| * allocation containing the &struct drm_dp_mst_branch or &struct |
| * drm_dp_mst_port respectively will be freed. |
| * |
| * For &struct drm_dp_mst_branch, malloc refcounts are not currently exposed |
| * to drivers. As of writing this documentation, there are no drivers that |
| * have a usecase for accessing &struct drm_dp_mst_branch outside of the MST |
| * helpers. Exposing this API to drivers in a race-free manner would take more |
| * tweaking of the refcounting scheme, however patches are welcome provided |
| * there is a legitimate driver usecase for this. |
| * |
| * Refcount relationships in a topology |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| * |
| * Let's take a look at why the relationship between topology and malloc |
| * refcounts is designed the way it is. |
| * |
| * .. kernel-figure:: dp-mst/topology-figure-1.dot |
| * |
| * An example of topology and malloc refs in a DP MST topology with two |
| * active payloads. Topology refcount increments are indicated by solid |
| * lines, and malloc refcount increments are indicated by dashed lines. |
| * Each starts from the branch which incremented the refcount, and ends at |
| * the branch to which the refcount belongs to, i.e. the arrow points the |
| * same way as the C pointers used to reference a structure. |
| * |
| * As you can see in the above figure, every branch increments the topology |
| * refcount of its children, and increments the malloc refcount of its |
| * parent. Additionally, every payload increments the malloc refcount of its |
| * assigned port by 1. |
| * |
| * So, what would happen if MSTB #3 from the above figure was unplugged from |
| * the system, but the driver hadn't yet removed payload #2 from port #3? The |
| * topology would start to look like the figure below. |
| * |
| * .. kernel-figure:: dp-mst/topology-figure-2.dot |
| * |
| * Ports and branch devices which have been released from memory are |
| * colored grey, and references which have been removed are colored red. |
| * |
| * Whenever a port or branch device's topology refcount reaches zero, it will |
| * decrement the topology refcounts of all its children, the malloc refcount |
| * of its parent, and finally its own malloc refcount. For MSTB #4 and port |
| * #4, this means they both have been disconnected from the topology and freed |
| * from memory. But, because payload #2 is still holding a reference to port |
| * #3, port #3 is removed from the topology but its &struct drm_dp_mst_port |
| * is still accessible from memory. This also means port #3 has not yet |
| * decremented the malloc refcount of MSTB #3, so its &struct |
| * drm_dp_mst_branch will also stay allocated in memory until port #3's |
| * malloc refcount reaches 0. |
| * |
| * This relationship is necessary because in order to release payload #2, we |
| * need to be able to figure out the last relative of port #3 that's still |
| * connected to the topology. In this case, we would travel up the topology as |
| * shown below. |
| * |
| * .. kernel-figure:: dp-mst/topology-figure-3.dot |
| * |
| * And finally, remove payload #2 by communicating with port #2 through |
| * sideband transactions. |
| */ |
| |
| /** |
| * drm_dp_mst_get_mstb_malloc() - Increment the malloc refcount of a branch |
| * device |
| * @mstb: The &struct drm_dp_mst_branch to increment the malloc refcount of |
| * |
| * Increments &drm_dp_mst_branch.malloc_kref. When |
| * &drm_dp_mst_branch.malloc_kref reaches 0, the memory allocation for @mstb |
| * will be released and @mstb may no longer be used. |
| * |
| * See also: drm_dp_mst_put_mstb_malloc() |
| */ |
| static void |
| drm_dp_mst_get_mstb_malloc(struct drm_dp_mst_branch *mstb) |
| { |
| kref_get(&mstb->malloc_kref); |
| DRM_DEBUG("mstb %p (%d)\n", mstb, kref_read(&mstb->malloc_kref)); |
| } |
| |
| /** |
| * drm_dp_mst_put_mstb_malloc() - Decrement the malloc refcount of a branch |
| * device |
| * @mstb: The &struct drm_dp_mst_branch to decrement the malloc refcount of |
| * |
| * Decrements &drm_dp_mst_branch.malloc_kref. When |
| * &drm_dp_mst_branch.malloc_kref reaches 0, the memory allocation for @mstb |
| * will be released and @mstb may no longer be used. |
| * |
| * See also: drm_dp_mst_get_mstb_malloc() |
| */ |
| static void |
| drm_dp_mst_put_mstb_malloc(struct drm_dp_mst_branch *mstb) |
| { |
| DRM_DEBUG("mstb %p (%d)\n", mstb, kref_read(&mstb->malloc_kref) - 1); |
| kref_put(&mstb->malloc_kref, drm_dp_free_mst_branch_device); |
| } |
| |
| static void drm_dp_free_mst_port(struct kref *kref) |
| { |
| struct drm_dp_mst_port *port = |
| container_of(kref, struct drm_dp_mst_port, malloc_kref); |
| |
| drm_dp_mst_put_mstb_malloc(port->parent); |
| kfree(port); |
| } |
| |
| /** |
| * drm_dp_mst_get_port_malloc() - Increment the malloc refcount of an MST port |
| * @port: The &struct drm_dp_mst_port to increment the malloc refcount of |
| * |
| * Increments &drm_dp_mst_port.malloc_kref. When &drm_dp_mst_port.malloc_kref |
| * reaches 0, the memory allocation for @port will be released and @port may |
| * no longer be used. |
| * |
| * Because @port could potentially be freed at any time by the DP MST helpers |
| * if &drm_dp_mst_port.malloc_kref reaches 0, including during a call to this |
| * function, drivers that which to make use of &struct drm_dp_mst_port should |
| * ensure that they grab at least one main malloc reference to their MST ports |
| * in &drm_dp_mst_topology_cbs.add_connector. This callback is called before |
| * there is any chance for &drm_dp_mst_port.malloc_kref to reach 0. |
| * |
| * See also: drm_dp_mst_put_port_malloc() |
| */ |
| void |
| drm_dp_mst_get_port_malloc(struct drm_dp_mst_port *port) |
| { |
| kref_get(&port->malloc_kref); |
| DRM_DEBUG("port %p (%d)\n", port, kref_read(&port->malloc_kref)); |
| } |
| EXPORT_SYMBOL(drm_dp_mst_get_port_malloc); |
| |
| /** |
| * drm_dp_mst_put_port_malloc() - Decrement the malloc refcount of an MST port |
| * @port: The &struct drm_dp_mst_port to decrement the malloc refcount of |
| * |
| * Decrements &drm_dp_mst_port.malloc_kref. When &drm_dp_mst_port.malloc_kref |
| * reaches 0, the memory allocation for @port will be released and @port may |
| * no longer be used. |
| * |
| * See also: drm_dp_mst_get_port_malloc() |
| */ |
| void |
| drm_dp_mst_put_port_malloc(struct drm_dp_mst_port *port) |
| { |
| DRM_DEBUG("port %p (%d)\n", port, kref_read(&port->malloc_kref) - 1); |
| kref_put(&port->malloc_kref, drm_dp_free_mst_port); |
| } |
| EXPORT_SYMBOL(drm_dp_mst_put_port_malloc); |
| |
| static void drm_dp_destroy_mst_branch_device(struct kref *kref) |
| { |
| struct drm_dp_mst_branch *mstb = |
| container_of(kref, struct drm_dp_mst_branch, topology_kref); |
| struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; |
| struct drm_dp_mst_port *port, *tmp; |
| bool wake_tx = false; |
| |
| mutex_lock(&mgr->lock); |
| list_for_each_entry_safe(port, tmp, &mstb->ports, next) { |
| list_del(&port->next); |
| drm_dp_mst_topology_put_port(port); |
| } |
| mutex_unlock(&mgr->lock); |
| |
| /* drop any tx slots msg */ |
| mutex_lock(&mstb->mgr->qlock); |
| if (mstb->tx_slots[0]) { |
| mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; |
| mstb->tx_slots[0] = NULL; |
| wake_tx = true; |
| } |
| if (mstb->tx_slots[1]) { |
| mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; |
| mstb->tx_slots[1] = NULL; |
| wake_tx = true; |
| } |
| mutex_unlock(&mstb->mgr->qlock); |
| |
| if (wake_tx) |
| wake_up_all(&mstb->mgr->tx_waitq); |
| |
| drm_dp_mst_put_mstb_malloc(mstb); |
| } |
| |
| /** |
| * drm_dp_mst_topology_try_get_mstb() - Increment the topology refcount of a |
| * branch device unless it's zero |
| * @mstb: &struct drm_dp_mst_branch to increment the topology refcount of |
| * |
| * Attempts to grab a topology reference to @mstb, if it hasn't yet been |
| * removed from the topology (e.g. &drm_dp_mst_branch.topology_kref has |
| * reached 0). Holding a topology reference implies that a malloc reference |
| * will be held to @mstb as long as the user holds the topology reference. |
| * |
| * Care should be taken to ensure that the user has at least one malloc |
| * reference to @mstb. If you already have a topology reference to @mstb, you |
| * should use drm_dp_mst_topology_get_mstb() instead. |
| * |
| * See also: |
| * drm_dp_mst_topology_get_mstb() |
| * drm_dp_mst_topology_put_mstb() |
| * |
| * Returns: |
| * * 1: A topology reference was grabbed successfully |
| * * 0: @port is no longer in the topology, no reference was grabbed |
| */ |
| static int __must_check |
| drm_dp_mst_topology_try_get_mstb(struct drm_dp_mst_branch *mstb) |
| { |
| int ret = kref_get_unless_zero(&mstb->topology_kref); |
| |
| if (ret) |
| DRM_DEBUG("mstb %p (%d)\n", mstb, |
| kref_read(&mstb->topology_kref)); |
| |
| return ret; |
| } |
| |
| /** |
| * drm_dp_mst_topology_get_mstb() - Increment the topology refcount of a |
| * branch device |
| * @mstb: The &struct drm_dp_mst_branch to increment the topology refcount of |
| * |
| * Increments &drm_dp_mst_branch.topology_refcount without checking whether or |
| * not it's already reached 0. This is only valid to use in scenarios where |
| * you are already guaranteed to have at least one active topology reference |
| * to @mstb. Otherwise, drm_dp_mst_topology_try_get_mstb() must be used. |
| * |
| * See also: |
| * drm_dp_mst_topology_try_get_mstb() |
| * drm_dp_mst_topology_put_mstb() |
| */ |
| static void drm_dp_mst_topology_get_mstb(struct drm_dp_mst_branch *mstb) |
| { |
| WARN_ON(kref_read(&mstb->topology_kref) == 0); |
| kref_get(&mstb->topology_kref); |
| DRM_DEBUG("mstb %p (%d)\n", mstb, kref_read(&mstb->topology_kref)); |
| } |
| |
| /** |
| * drm_dp_mst_topology_put_mstb() - release a topology reference to a branch |
| * device |
| * @mstb: The &struct drm_dp_mst_branch to release the topology reference from |
| * |
| * Releases a topology reference from @mstb by decrementing |
| * &drm_dp_mst_branch.topology_kref. |
| * |
| * See also: |
| * drm_dp_mst_topology_try_get_mstb() |
| * drm_dp_mst_topology_get_mstb() |
| */ |
| static void |
| drm_dp_mst_topology_put_mstb(struct drm_dp_mst_branch *mstb) |
| { |
| DRM_DEBUG("mstb %p (%d)\n", |
| mstb, kref_read(&mstb->topology_kref) - 1); |
| kref_put(&mstb->topology_kref, drm_dp_destroy_mst_branch_device); |
| } |
| |
| static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt) |
| { |
| struct drm_dp_mst_branch *mstb; |
| |
| switch (old_pdt) { |
| case DP_PEER_DEVICE_DP_LEGACY_CONV: |
| case DP_PEER_DEVICE_SST_SINK: |
| /* remove i2c over sideband */ |
| drm_dp_mst_unregister_i2c_bus(&port->aux); |
| break; |
| case DP_PEER_DEVICE_MST_BRANCHING: |
| mstb = port->mstb; |
| port->mstb = NULL; |
| drm_dp_mst_topology_put_mstb(mstb); |
| break; |
| } |
| } |
| |
| static void drm_dp_destroy_port(struct kref *kref) |
| { |
| struct drm_dp_mst_port *port = |
| container_of(kref, struct drm_dp_mst_port, topology_kref); |
| struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
| |
| if (!port->input) { |
| kfree(port->cached_edid); |
| |
| /* |
| * The only time we don't have a connector |
| * on an output port is if the connector init |
| * fails. |
| */ |
| if (port->connector) { |
| /* we can't destroy the connector here, as |
| * we might be holding the mode_config.mutex |
| * from an EDID retrieval */ |
| |
| mutex_lock(&mgr->destroy_connector_lock); |
| list_add(&port->next, &mgr->destroy_connector_list); |
| mutex_unlock(&mgr->destroy_connector_lock); |
| schedule_work(&mgr->destroy_connector_work); |
| return; |
| } |
| /* no need to clean up vcpi |
| * as if we have no connector we never setup a vcpi */ |
| drm_dp_port_teardown_pdt(port, port->pdt); |
| port->pdt = DP_PEER_DEVICE_NONE; |
| } |
| drm_dp_mst_put_port_malloc(port); |
| } |
| |
| /** |
| * drm_dp_mst_topology_try_get_port() - Increment the topology refcount of a |
| * port unless it's zero |
| * @port: &struct drm_dp_mst_port to increment the topology refcount of |
| * |
| * Attempts to grab a topology reference to @port, if it hasn't yet been |
| * removed from the topology (e.g. &drm_dp_mst_port.topology_kref has reached |
| * 0). Holding a topology reference implies that a malloc reference will be |
| * held to @port as long as the user holds the topology reference. |
| * |
| * Care should be taken to ensure that the user has at least one malloc |
| * reference to @port. If you already have a topology reference to @port, you |
| * should use drm_dp_mst_topology_get_port() instead. |
| * |
| * See also: |
| * drm_dp_mst_topology_get_port() |
| * drm_dp_mst_topology_put_port() |
| * |
| * Returns: |
| * * 1: A topology reference was grabbed successfully |
| * * 0: @port is no longer in the topology, no reference was grabbed |
| */ |
| static int __must_check |
| drm_dp_mst_topology_try_get_port(struct drm_dp_mst_port *port) |
| { |
| int ret = kref_get_unless_zero(&port->topology_kref); |
| |
| if (ret) |
| DRM_DEBUG("port %p (%d)\n", port, |
| kref_read(&port->topology_kref)); |
| |
| return ret; |
| } |
| |
| /** |
| * drm_dp_mst_topology_get_port() - Increment the topology refcount of a port |
| * @port: The &struct drm_dp_mst_port to increment the topology refcount of |
| * |
| * Increments &drm_dp_mst_port.topology_refcount without checking whether or |
| * not it's already reached 0. This is only valid to use in scenarios where |
| * you are already guaranteed to have at least one active topology reference |
| * to @port. Otherwise, drm_dp_mst_topology_try_get_port() must be used. |
| * |
| * See also: |
| * drm_dp_mst_topology_try_get_port() |
| * drm_dp_mst_topology_put_port() |
| */ |
| static void drm_dp_mst_topology_get_port(struct drm_dp_mst_port *port) |
| { |
| WARN_ON(kref_read(&port->topology_kref) == 0); |
| kref_get(&port->topology_kref); |
| DRM_DEBUG("port %p (%d)\n", port, kref_read(&port->topology_kref)); |
| } |
| |
| /** |
| * drm_dp_mst_topology_put_port() - release a topology reference to a port |
| * @port: The &struct drm_dp_mst_port to release the topology reference from |
| * |
| * Releases a topology reference from @port by decrementing |
| * &drm_dp_mst_port.topology_kref. |
| * |
| * See also: |
| * drm_dp_mst_topology_try_get_port() |
| * drm_dp_mst_topology_get_port() |
| */ |
| static void drm_dp_mst_topology_put_port(struct drm_dp_mst_port *port) |
| { |
| DRM_DEBUG("port %p (%d)\n", |
| port, kref_read(&port->topology_kref) - 1); |
| kref_put(&port->topology_kref, drm_dp_destroy_port); |
| } |
| |
| static struct drm_dp_mst_branch * |
| drm_dp_mst_topology_get_mstb_validated_locked(struct drm_dp_mst_branch *mstb, |
| struct drm_dp_mst_branch *to_find) |
| { |
| struct drm_dp_mst_port *port; |
| struct drm_dp_mst_branch *rmstb; |
| |
| if (to_find == mstb) |
| return mstb; |
| |
| list_for_each_entry(port, &mstb->ports, next) { |
| if (port->mstb) { |
| rmstb = drm_dp_mst_topology_get_mstb_validated_locked( |
| port->mstb, to_find); |
| if (rmstb) |
| return rmstb; |
| } |
| } |
| return NULL; |
| } |
| |
| static struct drm_dp_mst_branch * |
| drm_dp_mst_topology_get_mstb_validated(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_mst_branch *mstb) |
| { |
| struct drm_dp_mst_branch *rmstb = NULL; |
| |
| mutex_lock(&mgr->lock); |
| if (mgr->mst_primary) { |
| rmstb = drm_dp_mst_topology_get_mstb_validated_locked( |
| mgr->mst_primary, mstb); |
| |
| if (rmstb && !drm_dp_mst_topology_try_get_mstb(rmstb)) |
| rmstb = NULL; |
| } |
| mutex_unlock(&mgr->lock); |
| return rmstb; |
| } |
| |
| static struct drm_dp_mst_port * |
| drm_dp_mst_topology_get_port_validated_locked(struct drm_dp_mst_branch *mstb, |
| struct drm_dp_mst_port *to_find) |
| { |
| struct drm_dp_mst_port *port, *mport; |
| |
| list_for_each_entry(port, &mstb->ports, next) { |
| if (port == to_find) |
| return port; |
| |
| if (port->mstb) { |
| mport = drm_dp_mst_topology_get_port_validated_locked( |
| port->mstb, to_find); |
| if (mport) |
| return mport; |
| } |
| } |
| return NULL; |
| } |
| |
| static struct drm_dp_mst_port * |
| drm_dp_mst_topology_get_port_validated(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_mst_port *port) |
| { |
| struct drm_dp_mst_port *rport = NULL; |
| |
| mutex_lock(&mgr->lock); |
| if (mgr->mst_primary) { |
| rport = drm_dp_mst_topology_get_port_validated_locked( |
| mgr->mst_primary, port); |
| |
| if (rport && !drm_dp_mst_topology_try_get_port(rport)) |
| rport = NULL; |
| } |
| mutex_unlock(&mgr->lock); |
| return rport; |
| } |
| |
| static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num) |
| { |
| struct drm_dp_mst_port *port; |
| int ret; |
| |
| list_for_each_entry(port, &mstb->ports, next) { |
| if (port->port_num == port_num) { |
| ret = drm_dp_mst_topology_try_get_port(port); |
| return ret ? port : NULL; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| /* |
| * calculate a new RAD for this MST branch device |
| * if parent has an LCT of 2 then it has 1 nibble of RAD, |
| * if parent has an LCT of 3 then it has 2 nibbles of RAD, |
| */ |
| static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, |
| u8 *rad) |
| { |
| int parent_lct = port->parent->lct; |
| int shift = 4; |
| int idx = (parent_lct - 1) / 2; |
| if (parent_lct > 1) { |
| memcpy(rad, port->parent->rad, idx + 1); |
| shift = (parent_lct % 2) ? 4 : 0; |
| } else |
| rad[0] = 0; |
| |
| rad[idx] |= port->port_num << shift; |
| return parent_lct + 1; |
| } |
| |
| /* |
| * return sends link address for new mstb |
| */ |
| static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port) |
| { |
| int ret; |
| u8 rad[6], lct; |
| bool send_link = false; |
| switch (port->pdt) { |
| case DP_PEER_DEVICE_DP_LEGACY_CONV: |
| case DP_PEER_DEVICE_SST_SINK: |
| /* add i2c over sideband */ |
| ret = drm_dp_mst_register_i2c_bus(&port->aux); |
| break; |
| case DP_PEER_DEVICE_MST_BRANCHING: |
| lct = drm_dp_calculate_rad(port, rad); |
| |
| port->mstb = drm_dp_add_mst_branch_device(lct, rad); |
| if (port->mstb) { |
| port->mstb->mgr = port->mgr; |
| port->mstb->port_parent = port; |
| /* |
| * Make sure this port's memory allocation stays |
| * around until its child MSTB releases it |
| */ |
| drm_dp_mst_get_port_malloc(port); |
| |
| send_link = true; |
| } |
| break; |
| } |
| return send_link; |
| } |
| |
| /** |
| * drm_dp_mst_dpcd_read() - read a series of bytes from the DPCD via sideband |
| * @aux: Fake sideband AUX CH |
| * @offset: address of the (first) register to read |
| * @buffer: buffer to store the register values |
| * @size: number of bytes in @buffer |
| * |
| * Performs the same functionality for remote devices via |
| * sideband messaging as drm_dp_dpcd_read() does for local |
| * devices via actual AUX CH. |
| * |
| * Return: Number of bytes read, or negative error code on failure. |
| */ |
| ssize_t drm_dp_mst_dpcd_read(struct drm_dp_aux *aux, |
| unsigned int offset, void *buffer, size_t size) |
| { |
| struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, |
| aux); |
| |
| return drm_dp_send_dpcd_read(port->mgr, port, |
| offset, size, buffer); |
| } |
| |
| /** |
| * drm_dp_mst_dpcd_write() - write a series of bytes to the DPCD via sideband |
| * @aux: Fake sideband AUX CH |
| * @offset: address of the (first) register to write |
| * @buffer: buffer containing the values to write |
| * @size: number of bytes in @buffer |
| * |
| * Performs the same functionality for remote devices via |
| * sideband messaging as drm_dp_dpcd_write() does for local |
| * devices via actual AUX CH. |
| * |
| * Return: 0 on success, negative error code on failure. |
| */ |
| ssize_t drm_dp_mst_dpcd_write(struct drm_dp_aux *aux, |
| unsigned int offset, void *buffer, size_t size) |
| { |
| struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, |
| aux); |
| |
| return drm_dp_send_dpcd_write(port->mgr, port, |
| offset, size, buffer); |
| } |
| |
| static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid) |
| { |
| int ret; |
| |
| memcpy(mstb->guid, guid, 16); |
| |
| if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) { |
| if (mstb->port_parent) { |
| ret = drm_dp_send_dpcd_write( |
| mstb->mgr, |
| mstb->port_parent, |
| DP_GUID, |
| 16, |
| mstb->guid); |
| } else { |
| |
| ret = drm_dp_dpcd_write( |
| mstb->mgr->aux, |
| DP_GUID, |
| mstb->guid, |
| 16); |
| } |
| } |
| } |
| |
| static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb, |
| int pnum, |
| char *proppath, |
| size_t proppath_size) |
| { |
| int i; |
| char temp[8]; |
| snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id); |
| for (i = 0; i < (mstb->lct - 1); i++) { |
| int shift = (i % 2) ? 0 : 4; |
| int port_num = (mstb->rad[i / 2] >> shift) & 0xf; |
| snprintf(temp, sizeof(temp), "-%d", port_num); |
| strlcat(proppath, temp, proppath_size); |
| } |
| snprintf(temp, sizeof(temp), "-%d", pnum); |
| strlcat(proppath, temp, proppath_size); |
| } |
| |
| /** |
| * drm_dp_mst_connector_late_register() - Late MST connector registration |
| * @connector: The MST connector |
| * @port: The MST port for this connector |
| * |
| * Helper to register the remote aux device for this MST port. Drivers should |
| * call this from their mst connector's late_register hook to enable MST aux |
| * devices. |
| * |
| * Return: 0 on success, negative error code on failure. |
| */ |
| int drm_dp_mst_connector_late_register(struct drm_connector *connector, |
| struct drm_dp_mst_port *port) |
| { |
| DRM_DEBUG_KMS("registering %s remote bus for %s\n", |
| port->aux.name, connector->kdev->kobj.name); |
| |
| port->aux.dev = connector->kdev; |
| return drm_dp_aux_register_devnode(&port->aux); |
| } |
| EXPORT_SYMBOL(drm_dp_mst_connector_late_register); |
| |
| /** |
| * drm_dp_mst_connector_early_unregister() - Early MST connector unregistration |
| * @connector: The MST connector |
| * @port: The MST port for this connector |
| * |
| * Helper to unregister the remote aux device for this MST port, registered by |
| * drm_dp_mst_connector_late_register(). Drivers should call this from their mst |
| * connector's early_unregister hook. |
| */ |
| void drm_dp_mst_connector_early_unregister(struct drm_connector *connector, |
| struct drm_dp_mst_port *port) |
| { |
| DRM_DEBUG_KMS("unregistering %s remote bus for %s\n", |
| port->aux.name, connector->kdev->kobj.name); |
| drm_dp_aux_unregister_devnode(&port->aux); |
| } |
| EXPORT_SYMBOL(drm_dp_mst_connector_early_unregister); |
| |
| static void drm_dp_add_port(struct drm_dp_mst_branch *mstb, |
| struct drm_device *dev, |
| struct drm_dp_link_addr_reply_port *port_msg) |
| { |
| struct drm_dp_mst_port *port; |
| bool ret; |
| bool created = false; |
| int old_pdt = 0; |
| int old_ddps = 0; |
| |
| port = drm_dp_get_port(mstb, port_msg->port_number); |
| if (!port) { |
| port = kzalloc(sizeof(*port), GFP_KERNEL); |
| if (!port) |
| return; |
| kref_init(&port->topology_kref); |
| kref_init(&port->malloc_kref); |
| port->parent = mstb; |
| port->port_num = port_msg->port_number; |
| port->mgr = mstb->mgr; |
| port->aux.name = "DPMST"; |
| port->aux.dev = dev->dev; |
| port->aux.is_remote = true; |
| |
| /* |
| * Make sure the memory allocation for our parent branch stays |
| * around until our own memory allocation is released |
| */ |
| drm_dp_mst_get_mstb_malloc(mstb); |
| |
| created = true; |
| } else { |
| old_pdt = port->pdt; |
| old_ddps = port->ddps; |
| } |
| |
| port->pdt = port_msg->peer_device_type; |
| port->input = port_msg->input_port; |
| port->mcs = port_msg->mcs; |
| port->ddps = port_msg->ddps; |
| port->ldps = port_msg->legacy_device_plug_status; |
| port->dpcd_rev = port_msg->dpcd_revision; |
| port->num_sdp_streams = port_msg->num_sdp_streams; |
| port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks; |
| |
| /* manage mstb port lists with mgr lock - take a reference |
| for this list */ |
| if (created) { |
| mutex_lock(&mstb->mgr->lock); |
| drm_dp_mst_topology_get_port(port); |
| list_add(&port->next, &mstb->ports); |
| mutex_unlock(&mstb->mgr->lock); |
| } |
| |
| if (old_ddps != port->ddps) { |
| if (port->ddps) { |
| if (!port->input) { |
| drm_dp_send_enum_path_resources(mstb->mgr, |
| mstb, port); |
| } |
| } else { |
| port->available_pbn = 0; |
| } |
| } |
| |
| if (old_pdt != port->pdt && !port->input) { |
| drm_dp_port_teardown_pdt(port, old_pdt); |
| |
| ret = drm_dp_port_setup_pdt(port); |
| if (ret == true) |
| drm_dp_send_link_address(mstb->mgr, port->mstb); |
| } |
| |
| if (created && !port->input) { |
| char proppath[255]; |
| |
| build_mst_prop_path(mstb, port->port_num, proppath, |
| sizeof(proppath)); |
| port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, |
| port, |
| proppath); |
| if (!port->connector) { |
| /* remove it from the port list */ |
| mutex_lock(&mstb->mgr->lock); |
| list_del(&port->next); |
| mutex_unlock(&mstb->mgr->lock); |
| /* drop port list reference */ |
| drm_dp_mst_topology_put_port(port); |
| goto out; |
| } |
| if ((port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV || |
| port->pdt == DP_PEER_DEVICE_SST_SINK) && |
| port->port_num >= DP_MST_LOGICAL_PORT_0) { |
| port->cached_edid = drm_get_edid(port->connector, |
| &port->aux.ddc); |
| drm_connector_set_tile_property(port->connector); |
| } |
| (*mstb->mgr->cbs->register_connector)(port->connector); |
| } |
| |
| out: |
| /* put reference to this port */ |
| drm_dp_mst_topology_put_port(port); |
| } |
| |
| static void drm_dp_update_port(struct drm_dp_mst_branch *mstb, |
| struct drm_dp_connection_status_notify *conn_stat) |
| { |
| struct drm_dp_mst_port *port; |
| int old_pdt; |
| int old_ddps; |
| bool dowork = false; |
| port = drm_dp_get_port(mstb, conn_stat->port_number); |
| if (!port) |
| return; |
| |
| old_ddps = port->ddps; |
| old_pdt = port->pdt; |
| port->pdt = conn_stat->peer_device_type; |
| port->mcs = conn_stat->message_capability_status; |
| port->ldps = conn_stat->legacy_device_plug_status; |
| port->ddps = conn_stat->displayport_device_plug_status; |
| |
| if (old_ddps != port->ddps) { |
| if (port->ddps) { |
| dowork = true; |
| } else { |
| port->available_pbn = 0; |
| } |
| } |
| if (old_pdt != port->pdt && !port->input) { |
| drm_dp_port_teardown_pdt(port, old_pdt); |
| |
| if (drm_dp_port_setup_pdt(port)) |
| dowork = true; |
| } |
| |
| drm_dp_mst_topology_put_port(port); |
| if (dowork) |
| queue_work(system_long_wq, &mstb->mgr->work); |
| |
| } |
| |
| static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr, |
| u8 lct, u8 *rad) |
| { |
| struct drm_dp_mst_branch *mstb; |
| struct drm_dp_mst_port *port; |
| int i, ret; |
| /* find the port by iterating down */ |
| |
| mutex_lock(&mgr->lock); |
| mstb = mgr->mst_primary; |
| |
| if (!mstb) |
| goto out; |
| |
| for (i = 0; i < lct - 1; i++) { |
| int shift = (i % 2) ? 0 : 4; |
| int port_num = (rad[i / 2] >> shift) & 0xf; |
| |
| list_for_each_entry(port, &mstb->ports, next) { |
| if (port->port_num == port_num) { |
| mstb = port->mstb; |
| if (!mstb) { |
| DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]); |
| goto out; |
| } |
| |
| break; |
| } |
| } |
| } |
| ret = drm_dp_mst_topology_try_get_mstb(mstb); |
| if (!ret) |
| mstb = NULL; |
| out: |
| mutex_unlock(&mgr->lock); |
| return mstb; |
| } |
| |
| static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper( |
| struct drm_dp_mst_branch *mstb, |
| uint8_t *guid) |
| { |
| struct drm_dp_mst_branch *found_mstb; |
| struct drm_dp_mst_port *port; |
| |
| if (memcmp(mstb->guid, guid, 16) == 0) |
| return mstb; |
| |
| |
| list_for_each_entry(port, &mstb->ports, next) { |
| if (!port->mstb) |
| continue; |
| |
| found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid); |
| |
| if (found_mstb) |
| return found_mstb; |
| } |
| |
| return NULL; |
| } |
| |
| static struct drm_dp_mst_branch * |
| drm_dp_get_mst_branch_device_by_guid(struct drm_dp_mst_topology_mgr *mgr, |
| uint8_t *guid) |
| { |
| struct drm_dp_mst_branch *mstb; |
| int ret; |
| |
| /* find the port by iterating down */ |
| mutex_lock(&mgr->lock); |
| |
| mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid); |
| if (mstb) { |
| ret = drm_dp_mst_topology_try_get_mstb(mstb); |
| if (!ret) |
| mstb = NULL; |
| } |
| |
| mutex_unlock(&mgr->lock); |
| return mstb; |
| } |
| |
| static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_mst_branch *mstb) |
| { |
| struct drm_dp_mst_port *port; |
| struct drm_dp_mst_branch *mstb_child; |
| if (!mstb->link_address_sent) |
| drm_dp_send_link_address(mgr, mstb); |
| |
| list_for_each_entry(port, &mstb->ports, next) { |
| if (port->input) |
| continue; |
| |
| if (!port->ddps) |
| continue; |
| |
| if (!port->available_pbn) |
| drm_dp_send_enum_path_resources(mgr, mstb, port); |
| |
| if (port->mstb) { |
| mstb_child = drm_dp_mst_topology_get_mstb_validated( |
| mgr, port->mstb); |
| if (mstb_child) { |
| drm_dp_check_and_send_link_address(mgr, mstb_child); |
| drm_dp_mst_topology_put_mstb(mstb_child); |
| } |
| } |
| } |
| } |
| |
| static void drm_dp_mst_link_probe_work(struct work_struct *work) |
| { |
| struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work); |
| struct drm_dp_mst_branch *mstb; |
| int ret; |
| |
| mutex_lock(&mgr->lock); |
| mstb = mgr->mst_primary; |
| if (mstb) { |
| ret = drm_dp_mst_topology_try_get_mstb(mstb); |
| if (!ret) |
| mstb = NULL; |
| } |
| mutex_unlock(&mgr->lock); |
| if (mstb) { |
| drm_dp_check_and_send_link_address(mgr, mstb); |
| drm_dp_mst_topology_put_mstb(mstb); |
| } |
| } |
| |
| static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, |
| u8 *guid) |
| { |
| u64 salt; |
| |
| if (memchr_inv(guid, 0, 16)) |
| return true; |
| |
| salt = get_jiffies_64(); |
| |
| memcpy(&guid[0], &salt, sizeof(u64)); |
| memcpy(&guid[8], &salt, sizeof(u64)); |
| |
| return false; |
| } |
| |
| static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes) |
| { |
| struct drm_dp_sideband_msg_req_body req; |
| |
| req.req_type = DP_REMOTE_DPCD_READ; |
| req.u.dpcd_read.port_number = port_num; |
| req.u.dpcd_read.dpcd_address = offset; |
| req.u.dpcd_read.num_bytes = num_bytes; |
| drm_dp_encode_sideband_req(&req, msg); |
| |
| return 0; |
| } |
| |
| static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr, |
| bool up, u8 *msg, int len) |
| { |
| int ret; |
| int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE; |
| int tosend, total, offset; |
| int retries = 0; |
| |
| retry: |
| total = len; |
| offset = 0; |
| do { |
| tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total); |
| |
| ret = drm_dp_dpcd_write(mgr->aux, regbase + offset, |
| &msg[offset], |
| tosend); |
| if (ret != tosend) { |
| if (ret == -EIO && retries < 5) { |
| retries++; |
| goto retry; |
| } |
| DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret); |
| |
| return -EIO; |
| } |
| offset += tosend; |
| total -= tosend; |
| } while (total > 0); |
| return 0; |
| } |
| |
| static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, |
| struct drm_dp_sideband_msg_tx *txmsg) |
| { |
| struct drm_dp_mst_branch *mstb = txmsg->dst; |
| u8 req_type; |
| |
| /* both msg slots are full */ |
| if (txmsg->seqno == -1) { |
| if (mstb->tx_slots[0] && mstb->tx_slots[1]) { |
| DRM_DEBUG_KMS("%s: failed to find slot\n", __func__); |
| return -EAGAIN; |
| } |
| if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) { |
| txmsg->seqno = mstb->last_seqno; |
| mstb->last_seqno ^= 1; |
| } else if (mstb->tx_slots[0] == NULL) |
| txmsg->seqno = 0; |
| else |
| txmsg->seqno = 1; |
| mstb->tx_slots[txmsg->seqno] = txmsg; |
| } |
| |
| req_type = txmsg->msg[0] & 0x7f; |
| if (req_type == DP_CONNECTION_STATUS_NOTIFY || |
| req_type == DP_RESOURCE_STATUS_NOTIFY) |
| hdr->broadcast = 1; |
| else |
| hdr->broadcast = 0; |
| hdr->path_msg = txmsg->path_msg; |
| hdr->lct = mstb->lct; |
| hdr->lcr = mstb->lct - 1; |
| if (mstb->lct > 1) |
| memcpy(hdr->rad, mstb->rad, mstb->lct / 2); |
| hdr->seqno = txmsg->seqno; |
| return 0; |
| } |
| /* |
| * process a single block of the next message in the sideband queue |
| */ |
| static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_sideband_msg_tx *txmsg, |
| bool up) |
| { |
| u8 chunk[48]; |
| struct drm_dp_sideband_msg_hdr hdr; |
| int len, space, idx, tosend; |
| int ret; |
| |
| memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr)); |
| |
| if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) { |
| txmsg->seqno = -1; |
| txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND; |
| } |
| |
| /* make hdr from dst mst - for replies use seqno |
| otherwise assign one */ |
| ret = set_hdr_from_dst_qlock(&hdr, txmsg); |
| if (ret < 0) |
| return ret; |
| |
| /* amount left to send in this message */ |
| len = txmsg->cur_len - txmsg->cur_offset; |
| |
| /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */ |
| space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr); |
| |
| tosend = min(len, space); |
| if (len == txmsg->cur_len) |
| hdr.somt = 1; |
| if (space >= len) |
| hdr.eomt = 1; |
| |
| |
| hdr.msg_len = tosend + 1; |
| drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx); |
| memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend); |
| /* add crc at end */ |
| drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend); |
| idx += tosend + 1; |
| |
| ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx); |
| if (ret) { |
| DRM_DEBUG_KMS("sideband msg failed to send\n"); |
| return ret; |
| } |
| |
| txmsg->cur_offset += tosend; |
| if (txmsg->cur_offset == txmsg->cur_len) { |
| txmsg->state = DRM_DP_SIDEBAND_TX_SENT; |
| return 1; |
| } |
| return 0; |
| } |
| |
| static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) |
| { |
| struct drm_dp_sideband_msg_tx *txmsg; |
| int ret; |
| |
| WARN_ON(!mutex_is_locked(&mgr->qlock)); |
| |
| /* construct a chunk from the first msg in the tx_msg queue */ |
| if (list_empty(&mgr->tx_msg_downq)) |
| return; |
| |
| txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next); |
| ret = process_single_tx_qlock(mgr, txmsg, false); |
| if (ret == 1) { |
| /* txmsg is sent it should be in the slots now */ |
| list_del(&txmsg->next); |
| } else if (ret) { |
| DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); |
| list_del(&txmsg->next); |
| if (txmsg->seqno != -1) |
| txmsg->dst->tx_slots[txmsg->seqno] = NULL; |
| txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT; |
| wake_up_all(&mgr->tx_waitq); |
| } |
| } |
| |
| /* called holding qlock */ |
| static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_sideband_msg_tx *txmsg) |
| { |
| int ret; |
| |
| /* construct a chunk from the first msg in the tx_msg queue */ |
| ret = process_single_tx_qlock(mgr, txmsg, true); |
| |
| if (ret != 1) |
| DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); |
| |
| if (txmsg->seqno != -1) { |
| WARN_ON((unsigned int)txmsg->seqno > |
| ARRAY_SIZE(txmsg->dst->tx_slots)); |
| txmsg->dst->tx_slots[txmsg->seqno] = NULL; |
| } |
| } |
| |
| static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_sideband_msg_tx *txmsg) |
| { |
| mutex_lock(&mgr->qlock); |
| list_add_tail(&txmsg->next, &mgr->tx_msg_downq); |
| if (list_is_singular(&mgr->tx_msg_downq)) |
| process_single_down_tx_qlock(mgr); |
| mutex_unlock(&mgr->qlock); |
| } |
| |
| static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_mst_branch *mstb) |
| { |
| int len; |
| struct drm_dp_sideband_msg_tx *txmsg; |
| int ret; |
| |
| txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| if (!txmsg) |
| return; |
| |
| txmsg->dst = mstb; |
| len = build_link_address(txmsg); |
| |
| mstb->link_address_sent = true; |
| drm_dp_queue_down_tx(mgr, txmsg); |
| |
| ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| if (ret > 0) { |
| int i; |
| |
| if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) { |
| DRM_DEBUG_KMS("link address nak received\n"); |
| } else { |
| DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports); |
| for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { |
| DRM_DEBUG_KMS("port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n", i, |
| txmsg->reply.u.link_addr.ports[i].input_port, |
| txmsg->reply.u.link_addr.ports[i].peer_device_type, |
| txmsg->reply.u.link_addr.ports[i].port_number, |
| txmsg->reply.u.link_addr.ports[i].dpcd_revision, |
| txmsg->reply.u.link_addr.ports[i].mcs, |
| txmsg->reply.u.link_addr.ports[i].ddps, |
| txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status, |
| txmsg->reply.u.link_addr.ports[i].num_sdp_streams, |
| txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks); |
| } |
| |
| drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid); |
| |
| for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { |
| drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]); |
| } |
| drm_kms_helper_hotplug_event(mgr->dev); |
| } |
| } else { |
| mstb->link_address_sent = false; |
| DRM_DEBUG_KMS("link address failed %d\n", ret); |
| } |
| |
| kfree(txmsg); |
| } |
| |
| static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_mst_branch *mstb, |
| struct drm_dp_mst_port *port) |
| { |
| int len; |
| struct drm_dp_sideband_msg_tx *txmsg; |
| int ret; |
| |
| txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| if (!txmsg) |
| return -ENOMEM; |
| |
| txmsg->dst = mstb; |
| len = build_enum_path_resources(txmsg, port->port_num); |
| |
| drm_dp_queue_down_tx(mgr, txmsg); |
| |
| ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| if (ret > 0) { |
| if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) { |
| DRM_DEBUG_KMS("enum path resources nak received\n"); |
| } else { |
| if (port->port_num != txmsg->reply.u.path_resources.port_number) |
| DRM_ERROR("got incorrect port in response\n"); |
| DRM_DEBUG_KMS("enum path resources %d: %d %d\n", txmsg->reply.u.path_resources.port_number, txmsg->reply.u.path_resources.full_payload_bw_number, |
| txmsg->reply.u.path_resources.avail_payload_bw_number); |
| port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number; |
| } |
| } |
| |
| kfree(txmsg); |
| return 0; |
| } |
| |
| static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb) |
| { |
| if (!mstb->port_parent) |
| return NULL; |
| |
| if (mstb->port_parent->mstb != mstb) |
| return mstb->port_parent; |
| |
| return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent); |
| } |
| |
| /* |
| * Searches upwards in the topology starting from mstb to try to find the |
| * closest available parent of mstb that's still connected to the rest of the |
| * topology. This can be used in order to perform operations like releasing |
| * payloads, where the branch device which owned the payload may no longer be |
| * around and thus would require that the payload on the last living relative |
| * be freed instead. |
| */ |
| static struct drm_dp_mst_branch * |
| drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_mst_branch *mstb, |
| int *port_num) |
| { |
| struct drm_dp_mst_branch *rmstb = NULL; |
| struct drm_dp_mst_port *found_port; |
| |
| mutex_lock(&mgr->lock); |
| if (!mgr->mst_primary) |
| goto out; |
| |
| do { |
| found_port = drm_dp_get_last_connected_port_to_mstb(mstb); |
| if (!found_port) |
| break; |
| |
| if (drm_dp_mst_topology_try_get_mstb(found_port->parent)) { |
| rmstb = found_port->parent; |
| *port_num = found_port->port_num; |
| } else { |
| /* Search again, starting from this parent */ |
| mstb = found_port->parent; |
| } |
| } while (!rmstb); |
| out: |
| mutex_unlock(&mgr->lock); |
| return rmstb; |
| } |
| |
| static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_mst_port *port, |
| int id, |
| int pbn) |
| { |
| struct drm_dp_sideband_msg_tx *txmsg; |
| struct drm_dp_mst_branch *mstb; |
| int len, ret, port_num; |
| u8 sinks[DRM_DP_MAX_SDP_STREAMS]; |
| int i; |
| |
| port_num = port->port_num; |
| mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent); |
| if (!mstb) { |
| mstb = drm_dp_get_last_connected_port_and_mstb(mgr, |
| port->parent, |
| &port_num); |
| |
| if (!mstb) |
| return -EINVAL; |
| } |
| |
| txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| if (!txmsg) { |
| ret = -ENOMEM; |
| goto fail_put; |
| } |
| |
| for (i = 0; i < port->num_sdp_streams; i++) |
| sinks[i] = i; |
| |
| txmsg->dst = mstb; |
| len = build_allocate_payload(txmsg, port_num, |
| id, |
| pbn, port->num_sdp_streams, sinks); |
| |
| drm_dp_queue_down_tx(mgr, txmsg); |
| |
| /* |
| * FIXME: there is a small chance that between getting the last |
| * connected mstb and sending the payload message, the last connected |
| * mstb could also be removed from the topology. In the future, this |
| * needs to be fixed by restarting the |
| * drm_dp_get_last_connected_port_and_mstb() search in the event of a |
| * timeout if the topology is still connected to the system. |
| */ |
| ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| if (ret > 0) { |
| if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) |
| ret = -EINVAL; |
| else |
| ret = 0; |
| } |
| kfree(txmsg); |
| fail_put: |
| drm_dp_mst_topology_put_mstb(mstb); |
| return ret; |
| } |
| |
| int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_mst_port *port, bool power_up) |
| { |
| struct drm_dp_sideband_msg_tx *txmsg; |
| int len, ret; |
| |
| port = drm_dp_mst_topology_get_port_validated(mgr, port); |
| if (!port) |
| return -EINVAL; |
| |
| txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| if (!txmsg) { |
| drm_dp_mst_topology_put_port(port); |
| return -ENOMEM; |
| } |
| |
| txmsg->dst = port->parent; |
| len = build_power_updown_phy(txmsg, port->port_num, power_up); |
| drm_dp_queue_down_tx(mgr, txmsg); |
| |
| ret = drm_dp_mst_wait_tx_reply(port->parent, txmsg); |
| if (ret > 0) { |
| if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) |
| ret = -EINVAL; |
| else |
| ret = 0; |
| } |
| kfree(txmsg); |
| drm_dp_mst_topology_put_port(port); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_dp_send_power_updown_phy); |
| |
| static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr, |
| int id, |
| struct drm_dp_payload *payload) |
| { |
| int ret; |
| |
| ret = drm_dp_dpcd_write_payload(mgr, id, payload); |
| if (ret < 0) { |
| payload->payload_state = 0; |
| return ret; |
| } |
| payload->payload_state = DP_PAYLOAD_LOCAL; |
| return 0; |
| } |
| |
| static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_mst_port *port, |
| int id, |
| struct drm_dp_payload *payload) |
| { |
| int ret; |
| ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn); |
| if (ret < 0) |
| return ret; |
| payload->payload_state = DP_PAYLOAD_REMOTE; |
| return ret; |
| } |
| |
| static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_mst_port *port, |
| int id, |
| struct drm_dp_payload *payload) |
| { |
| DRM_DEBUG_KMS("\n"); |
| /* it's okay for these to fail */ |
| if (port) { |
| drm_dp_payload_send_msg(mgr, port, id, 0); |
| } |
| |
| drm_dp_dpcd_write_payload(mgr, id, payload); |
| payload->payload_state = DP_PAYLOAD_DELETE_LOCAL; |
| return 0; |
| } |
| |
| static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
| int id, |
| struct drm_dp_payload *payload) |
| { |
| payload->payload_state = 0; |
| return 0; |
| } |
| |
| /** |
| * drm_dp_update_payload_part1() - Execute payload update part 1 |
| * @mgr: manager to use. |
| * |
| * This iterates over all proposed virtual channels, and tries to |
| * allocate space in the link for them. For 0->slots transitions, |
| * this step just writes the VCPI to the MST device. For slots->0 |
| * transitions, this writes the updated VCPIs and removes the |
| * remote VC payloads. |
| * |
| * after calling this the driver should generate ACT and payload |
| * packets. |
| */ |
| int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr) |
| { |
| struct drm_dp_payload req_payload; |
| struct drm_dp_mst_port *port; |
| int i, j; |
| int cur_slots = 1; |
| |
| mutex_lock(&mgr->payload_lock); |
| for (i = 0; i < mgr->max_payloads; i++) { |
| struct drm_dp_vcpi *vcpi = mgr->proposed_vcpis[i]; |
| struct drm_dp_payload *payload = &mgr->payloads[i]; |
| bool put_port = false; |
| |
| /* solve the current payloads - compare to the hw ones |
| - update the hw view */ |
| req_payload.start_slot = cur_slots; |
| if (vcpi) { |
| port = container_of(vcpi, struct drm_dp_mst_port, |
| vcpi); |
| |
| /* Validated ports don't matter if we're releasing |
| * VCPI |
| */ |
| if (vcpi->num_slots) { |
| port = drm_dp_mst_topology_get_port_validated( |
| mgr, port); |
| if (!port) { |
| mutex_unlock(&mgr->payload_lock); |
| return -EINVAL; |
| } |
| put_port = true; |
| } |
| |
| req_payload.num_slots = vcpi->num_slots; |
| req_payload.vcpi = vcpi->vcpi; |
| } else { |
| port = NULL; |
| req_payload.num_slots = 0; |
| } |
| |
| payload->start_slot = req_payload.start_slot; |
| /* work out what is required to happen with this payload */ |
| if (payload->num_slots != req_payload.num_slots) { |
| |
| /* need to push an update for this payload */ |
| if (req_payload.num_slots) { |
| drm_dp_create_payload_step1(mgr, vcpi->vcpi, |
| &req_payload); |
| payload->num_slots = req_payload.num_slots; |
| payload->vcpi = req_payload.vcpi; |
| |
| } else if (payload->num_slots) { |
| payload->num_slots = 0; |
| drm_dp_destroy_payload_step1(mgr, port, |
| payload->vcpi, |
| payload); |
| req_payload.payload_state = |
| payload->payload_state; |
| payload->start_slot = 0; |
| } |
| payload->payload_state = req_payload.payload_state; |
| } |
| cur_slots += req_payload.num_slots; |
| |
| if (put_port) |
| drm_dp_mst_topology_put_port(port); |
| } |
| |
| for (i = 0; i < mgr->max_payloads; /* do nothing */) { |
| if (mgr->payloads[i].payload_state != DP_PAYLOAD_DELETE_LOCAL) { |
| i++; |
| continue; |
| } |
| |
| DRM_DEBUG_KMS("removing payload %d\n", i); |
| for (j = i; j < mgr->max_payloads - 1; j++) { |
| mgr->payloads[j] = mgr->payloads[j + 1]; |
| mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1]; |
| |
| if (mgr->proposed_vcpis[j] && |
| mgr->proposed_vcpis[j]->num_slots) { |
| set_bit(j + 1, &mgr->payload_mask); |
| } else { |
| clear_bit(j + 1, &mgr->payload_mask); |
| } |
| } |
| |
| memset(&mgr->payloads[mgr->max_payloads - 1], 0, |
| sizeof(struct drm_dp_payload)); |
| mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL; |
| clear_bit(mgr->max_payloads, &mgr->payload_mask); |
| } |
| mutex_unlock(&mgr->payload_lock); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_dp_update_payload_part1); |
| |
| /** |
| * drm_dp_update_payload_part2() - Execute payload update part 2 |
| * @mgr: manager to use. |
| * |
| * This iterates over all proposed virtual channels, and tries to |
| * allocate space in the link for them. For 0->slots transitions, |
| * this step writes the remote VC payload commands. For slots->0 |
| * this just resets some internal state. |
| */ |
| int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr) |
| { |
| struct drm_dp_mst_port *port; |
| int i; |
| int ret = 0; |
| mutex_lock(&mgr->payload_lock); |
| for (i = 0; i < mgr->max_payloads; i++) { |
| |
| if (!mgr->proposed_vcpis[i]) |
| continue; |
| |
| port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); |
| |
| DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state); |
| if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) { |
| ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); |
| } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { |
| ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); |
| } |
| if (ret) { |
| mutex_unlock(&mgr->payload_lock); |
| return ret; |
| } |
| } |
| mutex_unlock(&mgr->payload_lock); |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_dp_update_payload_part2); |
| |
| static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_mst_port *port, |
| int offset, int size, u8 *bytes) |
| { |
| int len; |
| int ret = 0; |
| struct drm_dp_sideband_msg_tx *txmsg; |
| struct drm_dp_mst_branch *mstb; |
| |
| mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent); |
| if (!mstb) |
| return -EINVAL; |
| |
| txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| if (!txmsg) { |
| ret = -ENOMEM; |
| goto fail_put; |
| } |
| |
| len = build_dpcd_read(txmsg, port->port_num, offset, size); |
| txmsg->dst = port->parent; |
| |
| drm_dp_queue_down_tx(mgr, txmsg); |
| |
| ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| if (ret < 0) |
| goto fail_free; |
| |
| /* DPCD read should never be NACKed */ |
| if (txmsg->reply.reply_type == 1) { |
| DRM_ERROR("mstb %p port %d: DPCD read on addr 0x%x for %d bytes NAKed\n", |
| mstb, port->port_num, offset, size); |
| ret = -EIO; |
| goto fail_free; |
| } |
| |
| if (txmsg->reply.u.remote_dpcd_read_ack.num_bytes != size) { |
| ret = -EPROTO; |
| goto fail_free; |
| } |
| |
| ret = min_t(size_t, txmsg->reply.u.remote_dpcd_read_ack.num_bytes, |
| size); |
| memcpy(bytes, txmsg->reply.u.remote_dpcd_read_ack.bytes, ret); |
| |
| fail_free: |
| kfree(txmsg); |
| fail_put: |
| drm_dp_mst_topology_put_mstb(mstb); |
| |
| return ret; |
| } |
| |
| static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_mst_port *port, |
| int offset, int size, u8 *bytes) |
| { |
| int len; |
| int ret; |
| struct drm_dp_sideband_msg_tx *txmsg; |
| struct drm_dp_mst_branch *mstb; |
| |
| mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent); |
| if (!mstb) |
| return -EINVAL; |
| |
| txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| if (!txmsg) { |
| ret = -ENOMEM; |
| goto fail_put; |
| } |
| |
| len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes); |
| txmsg->dst = mstb; |
| |
| drm_dp_queue_down_tx(mgr, txmsg); |
| |
| ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| if (ret > 0) { |
| if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) |
| ret = -EIO; |
| else |
| ret = 0; |
| } |
| kfree(txmsg); |
| fail_put: |
| drm_dp_mst_topology_put_mstb(mstb); |
| return ret; |
| } |
| |
| static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type) |
| { |
| struct drm_dp_sideband_msg_reply_body reply; |
| |
| reply.reply_type = DP_SIDEBAND_REPLY_ACK; |
| reply.req_type = req_type; |
| drm_dp_encode_sideband_reply(&reply, msg); |
| return 0; |
| } |
| |
| static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, |
| struct drm_dp_mst_branch *mstb, |
| int req_type, int seqno, bool broadcast) |
| { |
| struct drm_dp_sideband_msg_tx *txmsg; |
| |
| txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| if (!txmsg) |
| return -ENOMEM; |
| |
| txmsg->dst = mstb; |
| txmsg->seqno = seqno; |
| drm_dp_encode_up_ack_reply(txmsg, req_type); |
| |
| mutex_lock(&mgr->qlock); |
| |
| process_single_up_tx_qlock(mgr, txmsg); |
| |
| mutex_unlock(&mgr->qlock); |
| |
| kfree(txmsg); |
| return 0; |
| } |
| |
| static bool drm_dp_get_vc_payload_bw(int dp_link_bw, |
| int dp_link_count, |
| int *out) |
| { |
| switch (dp_link_bw) { |
| default: |
| DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n", |
| dp_link_bw, dp_link_count); |
| return false; |
| |
| case DP_LINK_BW_1_62: |
| *out = 3 * dp_link_count; |
| break; |
| case DP_LINK_BW_2_7: |
| *out = 5 * dp_link_count; |
| break; |
| case DP_LINK_BW_5_4: |
| *out = 10 * dp_link_count; |
| break; |
| case DP_LINK_BW_8_1: |
| *out = 15 * dp_link_count; |
| break; |
| } |
| return true; |
| } |
| |
| /** |
| * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager |
| * @mgr: manager to set state for |
| * @mst_state: true to enable MST on this connector - false to disable. |
| * |
| * This is called by the driver when it detects an MST capable device plugged |
| * into a DP MST capable port, or when a DP MST capable device is unplugged. |
| */ |
| int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state) |
| { |
| int ret = 0; |
| struct drm_dp_mst_branch *mstb = NULL; |
| |
| mutex_lock(&mgr->payload_lock); |
| mutex_lock(&mgr->lock); |
| if (mst_state == mgr->mst_state) |
| goto out_unlock; |
| |
| mgr->mst_state = mst_state; |
| /* set the device into MST mode */ |
| if (mst_state) { |
| WARN_ON(mgr->mst_primary); |
| |
| /* get dpcd info */ |
| ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); |
| if (ret != DP_RECEIVER_CAP_SIZE) { |
| DRM_DEBUG_KMS("failed to read DPCD\n"); |
| goto out_unlock; |
| } |
| |
| if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1], |
| mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK, |
| &mgr->pbn_div)) { |
| ret = -EINVAL; |
| goto out_unlock; |
| } |
| |
| /* add initial branch device at LCT 1 */ |
| mstb = drm_dp_add_mst_branch_device(1, NULL); |
| if (mstb == NULL) { |
| ret = -ENOMEM; |
| goto out_unlock; |
| } |
| mstb->mgr = mgr; |
| |
| /* give this the main reference */ |
| mgr->mst_primary = mstb; |
| drm_dp_mst_topology_get_mstb(mgr->mst_primary); |
| |
| ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
| DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); |
| if (ret < 0) { |
| goto out_unlock; |
| } |
| |
| { |
| struct drm_dp_payload reset_pay; |
| reset_pay.start_slot = 0; |
| reset_pay.num_slots = 0x3f; |
| drm_dp_dpcd_write_payload(mgr, 0, &reset_pay); |
| } |
| |
| queue_work(system_long_wq, &mgr->work); |
| |
| ret = 0; |
| } else { |
| /* disable MST on the device */ |
| mstb = mgr->mst_primary; |
| mgr->mst_primary = NULL; |
| /* this can fail if the device is gone */ |
| drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); |
| ret = 0; |
| memset(mgr->payloads, 0, |
| mgr->max_payloads * sizeof(mgr->payloads[0])); |
| memset(mgr->proposed_vcpis, 0, |
| mgr->max_payloads * sizeof(mgr->proposed_vcpis[0])); |
| mgr->payload_mask = 0; |
| set_bit(0, &mgr->payload_mask); |
| mgr->vcpi_mask = 0; |
| } |
| |
| out_unlock: |
| mutex_unlock(&mgr->lock); |
| mutex_unlock(&mgr->payload_lock); |
| if (mstb) |
| drm_dp_mst_topology_put_mstb(mstb); |
| return ret; |
| |
| } |
| EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); |
| |
| /** |
| * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager |
| * @mgr: manager to suspend |
| * |
| * This function tells the MST device that we can't handle UP messages |
| * anymore. This should stop it from sending any since we are suspended. |
| */ |
| void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) |
| { |
| mutex_lock(&mgr->lock); |
| drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
| DP_MST_EN | DP_UPSTREAM_IS_SRC); |
| mutex_unlock(&mgr->lock); |
| flush_work(&mgr->work); |
| flush_work(&mgr->destroy_connector_work); |
| } |
| EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); |
| |
| /** |
| * drm_dp_mst_topology_mgr_resume() - resume the MST manager |
| * @mgr: manager to resume |
| * |
| * This will fetch DPCD and see if the device is still there, |
| * if it is, it will rewrite the MSTM control bits, and return. |
| * |
| * if the device fails this returns -1, and the driver should do |
| * a full MST reprobe, in case we were undocked. |
| */ |
| int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr) |
| { |
| int ret = 0; |
| |
| mutex_lock(&mgr->lock); |
| |
| if (mgr->mst_primary) { |
| int sret; |
| u8 guid[16]; |
| |
| sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); |
| if (sret != DP_RECEIVER_CAP_SIZE) { |
| DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); |
| ret = -1; |
| goto out_unlock; |
| } |
| |
| ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
| DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); |
| if (ret < 0) { |
| DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n"); |
| ret = -1; |
| goto out_unlock; |
| } |
| |
| /* Some hubs forget their guids after they resume */ |
| sret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16); |
| if (sret != 16) { |
| DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); |
| ret = -1; |
| goto out_unlock; |
| } |
| drm_dp_check_mstb_guid(mgr->mst_primary, guid); |
| |
| ret = 0; |
| } else |
| ret = -1; |
| |
| out_unlock: |
| mutex_unlock(&mgr->lock); |
| return ret; |
| } |
| 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) |
| { |
| int len; |
| u8 replyblock[32]; |
| int replylen, origlen, curreply; |
| int ret; |
| struct drm_dp_sideband_msg_rx *msg; |
| int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE; |
| msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv; |
| |
| len = min(mgr->max_dpcd_transaction_bytes, 16); |
| ret = drm_dp_dpcd_read(mgr->aux, basereg, |
| replyblock, len); |
| if (ret != len) { |
| DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret); |
| return false; |
| } |
| ret = drm_dp_sideband_msg_build(msg, replyblock, len, true); |
| if (!ret) { |
| DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]); |
| return false; |
| } |
| replylen = msg->curchunk_len + msg->curchunk_hdrlen; |
| |
| origlen = replylen; |
| replylen -= len; |
| curreply = len; |
| while (replylen > 0) { |
| len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16); |
| ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply, |
| replyblock, len); |
| if (ret != len) { |
| DRM_DEBUG_KMS("failed to read a chunk (len %d, ret %d)\n", |
| len, ret); |
| return false; |
| } |
| |
| ret = drm_dp_sideband_msg_build(msg, replyblock, len, false); |
| if (!ret) { |
| DRM_DEBUG_KMS("failed to build sideband msg\n"); |
| return false; |
| } |
| |
| curreply += len; |
| replylen -= len; |
| } |
| return true; |
| } |
| |
| static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) |
| { |
| int ret = 0; |
| |
| if (!drm_dp_get_one_sb_msg(mgr, false)) { |
| memset(&mgr->down_rep_recv, 0, |
| sizeof(struct drm_dp_sideband_msg_rx)); |
| return 0; |
| } |
| |
| if (mgr->down_rep_recv.have_eomt) { |
| struct drm_dp_sideband_msg_tx *txmsg; |
| struct drm_dp_mst_branch *mstb; |
| int slot = -1; |
| mstb = drm_dp_get_mst_branch_device(mgr, |
| mgr->down_rep_recv.initial_hdr.lct, |
| mgr->down_rep_recv.initial_hdr.rad); |
| |
| if (!mstb) { |
| DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct); |
| memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
| return 0; |
| } |
| |
| /* find the message */ |
| slot = mgr->down_rep_recv.initial_hdr.seqno; |
| mutex_lock(&mgr->qlock); |
| txmsg = mstb->tx_slots[slot]; |
| /* remove from slots */ |
| mutex_unlock(&mgr->qlock); |
| |
| if (!txmsg) { |
| DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n", |
| mstb, |
| mgr->down_rep_recv.initial_hdr.seqno, |
| mgr->down_rep_recv.initial_hdr.lct, |
| mgr->down_rep_recv.initial_hdr.rad[0], |
| mgr->down_rep_recv.msg[0]); |
| drm_dp_mst_topology_put_mstb(mstb); |
| memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
| return 0; |
| } |
| |
| drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply); |
| |
| 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", |
| txmsg->reply.req_type, |
| drm_dp_mst_req_type_str(txmsg->reply.req_type), |
| txmsg->reply.u.nak.reason, |
| drm_dp_mst_nak_reason_str(txmsg->reply.u.nak.reason), |
| txmsg->reply.u.nak.nak_data); |
| |
| memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
| drm_dp_mst_topology_put_mstb(mstb); |
| |
| mutex_lock(&mgr->qlock); |
| txmsg->state = DRM_DP_SIDEBAND_TX_RX; |
| mstb->tx_slots[slot] = NULL; |
| mutex_unlock(&mgr->qlock); |
| |
| wake_up_all(&mgr->tx_waitq); |
| } |
| return ret; |
| } |
| |
| static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) |
| { |
| int ret = 0; |
| |
| if (!drm_dp_get_one_sb_msg(mgr, true)) { |
| memset(&mgr->up_req_recv, 0, |
| sizeof(struct drm_dp_sideband_msg_rx)); |
| return 0; |
| } |
| |
| if (mgr->up_req_recv.have_eomt) { |
| struct drm_dp_sideband_msg_req_body msg; |
| struct drm_dp_mst_branch *mstb = NULL; |
| bool seqno; |
| |
| if (!mgr->up_req_recv.initial_hdr.broadcast) { |
| mstb = drm_dp_get_mst_branch_device(mgr, |
| mgr->up_req_recv.initial_hdr.lct, |
| mgr->up_req_recv.initial_hdr.rad); |
| if (!mstb) { |
| DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); |
| memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |