Up requests are decoded by drm_dp_sideband_parse_req(), which operates on a drm_dp_sideband_msg_rx, unlike down requests. Expand the existing self-test helper sideband_msg_req_encode_decode() to copy the message contents and length from a drm_dp_sideband_msg_tx to drm_dp_sideband_msg_rx and use the parse function under test in place of decode. Add an additional helper for testing clearly-invalid up messages, verifying that parse rejects them.

Add support for currently-supported up requests to drm_dp_dump_sideband_msg_req_body(); add support to drm_dp_encode_sideband_req() to allow encoding for the self-tests.

Add self-tests for CONNECTION_STATUS_NOTIFY and RESOURCE_STATUS_NOTIFY.

Reviewed-by: Lyude Paul lyude@redhat.com Signed-off-by: Sam McNally sammc@chromium.org ---

(no changes since v5)

Changes in v5: - Set mock device name to more clearly attribute error/debug logging to the self-test, in particular for cases where failures are expected

Changes in v4: - New in v4

drivers/gpu/drm/drm_dp_mst_topology.c | 54 ++++++- .../gpu/drm/drm_dp_mst_topology_internal.h | 4 + .../drm/selftests/test-drm_dp_mst_helper.c | 149 ++++++++++++++++-- 3 files changed, 192 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index ad0795afc21c..ee58f6517482 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -445,6 +445,37 @@ drm_dp_encode_sideband_req(const struct drm_dp_sideband_msg_req_body *req, idx++; } break; + case DP_CONNECTION_STATUS_NOTIFY: { + const struct drm_dp_connection_status_notify *msg; + + msg = &req->u.conn_stat; + buf[idx] = (msg->port_number & 0xf) << 4; + idx++; + memcpy(&raw->msg[idx], msg->guid, 16); + idx += 16; + raw->msg[idx] = 0; + raw->msg[idx] |= msg->legacy_device_plug_status ? BIT(6) : 0; + raw->msg[idx] |= msg->displayport_device_plug_status ? BIT(5) : 0; + raw->msg[idx] |= msg->message_capability_status ? BIT(4) : 0; + raw->msg[idx] |= msg->input_port ? BIT(3) : 0; + raw->msg[idx] |= FIELD_PREP(GENMASK(2, 0), msg->peer_device_type); + idx++; + break; + } + case DP_RESOURCE_STATUS_NOTIFY: { + const struct drm_dp_resource_status_notify *msg; + + msg = &req->u.resource_stat; + buf[idx] = (msg->port_number & 0xf) << 4; + idx++; + memcpy(&raw->msg[idx], msg->guid, 16); + idx += 16; + buf[idx] = (msg->available_pbn & 0xff00) >> 8; + idx++; + buf[idx] = (msg->available_pbn & 0xff); + idx++; + break; + } } raw->cur_len = idx; } @@ -675,6 +706,22 @@ drm_dp_dump_sideband_msg_req_body(const struct drm_dp_sideband_msg_req_body *req req->u.enc_status.stream_behavior, req->u.enc_status.valid_stream_behavior); break; + case DP_CONNECTION_STATUS_NOTIFY: + P("port=%d guid=%*ph legacy=%d displayport=%d messaging=%d input=%d peer_type=%d", + req->u.conn_stat.port_number, + (int)ARRAY_SIZE(req->u.conn_stat.guid), req->u.conn_stat.guid, + req->u.conn_stat.legacy_device_plug_status, + req->u.conn_stat.displayport_device_plug_status, + req->u.conn_stat.message_capability_status, + req->u.conn_stat.input_port, + req->u.conn_stat.peer_device_type); + break; + case DP_RESOURCE_STATUS_NOTIFY: + P("port=%d guid=%*ph pbn=%d", + req->u.resource_stat.port_number, + (int)ARRAY_SIZE(req->u.resource_stat.guid), req->u.resource_stat.guid, + req->u.resource_stat.available_pbn); + break; default: P("???\n"); break; @@ -1119,9 +1166,9 @@ static bool drm_dp_sideband_parse_resource_status_notify(const struct drm_dp_mst return false; }

-static bool drm_dp_sideband_parse_req(const struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_sideband_msg_rx *raw, - struct drm_dp_sideband_msg_req_body *msg) +bool drm_dp_sideband_parse_req(const struct drm_dp_mst_topology_mgr *mgr, + 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); @@ -1137,6 +1184,7 @@ static bool drm_dp_sideband_parse_req(const struct drm_dp_mst_topology_mgr *mgr, return false; } } +EXPORT_SYMBOL_FOR_TESTS_ONLY(drm_dp_sideband_parse_req);

static void build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes) diff --git a/drivers/gpu/drm/drm_dp_mst_topology_internal.h b/drivers/gpu/drm/drm_dp_mst_topology_internal.h index eeda9a61c657..0356a2e0dba1 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology_internal.h +++ b/drivers/gpu/drm/drm_dp_mst_topology_internal.h @@ -21,4 +21,8 @@ void drm_dp_dump_sideband_msg_req_body(const struct drm_dp_sideband_msg_req_body *req, int indent, struct drm_printer *printer);

+bool +drm_dp_sideband_parse_req(const struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_req_body *msg); #endif /* !_DRM_DP_MST_HELPER_INTERNAL_H_ */ 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 6b4759ed6bfd..7bbeb1e5bc97 100644 --- a/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c +++ b/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c @@ -13,6 +13,10 @@ #include "../drm_dp_mst_topology_internal.h" #include "test-drm_modeset_common.h"

+static void mock_release(struct device *dev) +{ +} + int igt_dp_mst_calc_pbn_mode(void *ignored) { int pbn, i; @@ -120,27 +124,60 @@ sideband_msg_req_equal(const struct drm_dp_sideband_msg_req_body *in, static bool sideband_msg_req_encode_decode(struct drm_dp_sideband_msg_req_body *in) { - struct drm_dp_sideband_msg_req_body *out; + struct drm_dp_sideband_msg_req_body *out = NULL; struct drm_printer p = drm_err_printer(PREFIX_STR); - struct drm_dp_sideband_msg_tx *txmsg; + struct drm_dp_sideband_msg_tx *txmsg = NULL; + struct drm_dp_sideband_msg_rx *rxmsg = NULL; + struct drm_dp_mst_topology_mgr *mgr = NULL; int i, ret; - bool result = true; + bool result = false;

out = kzalloc(sizeof(*out), GFP_KERNEL); if (!out) - return false; + goto out;

txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); if (!txmsg) - return false; + goto out;

- drm_dp_encode_sideband_req(in, txmsg); - ret = drm_dp_decode_sideband_req(txmsg, out); - if (ret < 0) { - drm_printf(&p, "Failed to decode sideband request: %d\n", - ret); - result = false; + rxmsg = kzalloc(sizeof(*rxmsg), GFP_KERNEL); + if (!rxmsg) goto out; + + mgr = kzalloc(sizeof(*mgr), GFP_KERNEL); + if (!mgr) + goto out; + + mgr->dev = kzalloc(sizeof(*mgr->dev), GFP_KERNEL); + if (!mgr->dev) + goto out; + + mgr->dev->dev = kzalloc(sizeof(*mgr->dev->dev), GFP_KERNEL); + if (!mgr->dev->dev) + goto out; + + mgr->dev->dev->release = mock_release; + mgr->dev->dev->init_name = PREFIX_STR; + device_initialize(mgr->dev->dev); + + drm_dp_encode_sideband_req(in, txmsg); + switch (in->req_type) { + case DP_CONNECTION_STATUS_NOTIFY: + case DP_RESOURCE_STATUS_NOTIFY: + memcpy(&rxmsg->msg, txmsg->msg, ARRAY_SIZE(rxmsg->msg)); + rxmsg->curlen = txmsg->cur_len; + if (!drm_dp_sideband_parse_req(mgr, rxmsg, out)) { + drm_printf(&p, "Failed to decode sideband request\n"); + goto out; + } + break; + default: + ret = drm_dp_decode_sideband_req(txmsg, out); + if (ret < 0) { + drm_printf(&p, "Failed to decode sideband request: %d\n", ret); + goto out; + } + break; }

if (!sideband_msg_req_equal(in, out)) { @@ -148,9 +185,9 @@ sideband_msg_req_encode_decode(struct drm_dp_sideband_msg_req_body *in) drm_dp_dump_sideband_msg_req_body(in, 1, &p); drm_printf(&p, "Got:\n"); drm_dp_dump_sideband_msg_req_body(out, 1, &p); - result = false; goto out; } + result = true;

switch (in->req_type) { case DP_REMOTE_DPCD_WRITE: @@ -171,6 +208,66 @@ sideband_msg_req_encode_decode(struct drm_dp_sideband_msg_req_body *in) out: kfree(out); kfree(txmsg); + kfree(rxmsg); + if (mgr) { + if (mgr->dev) { + put_device(mgr->dev->dev); + kfree(mgr->dev); + } + kfree(mgr); + } + return result; +} + +static bool +sideband_msg_req_parse(int req_type) +{ + struct drm_dp_sideband_msg_req_body *out = NULL; + struct drm_printer p = drm_err_printer(PREFIX_STR); + struct drm_dp_sideband_msg_rx *rxmsg = NULL; + struct drm_dp_mst_topology_mgr *mgr = NULL; + bool result = false; + + out = kzalloc(sizeof(*out), GFP_KERNEL); + if (!out) + goto out; + + rxmsg = kzalloc(sizeof(*rxmsg), GFP_KERNEL); + if (!rxmsg) + goto out; + + mgr = kzalloc(sizeof(*mgr), GFP_KERNEL); + if (!mgr) + goto out; + + mgr->dev = kzalloc(sizeof(*mgr->dev), GFP_KERNEL); + if (!mgr->dev) + goto out; + + mgr->dev->dev = kzalloc(sizeof(*mgr->dev->dev), GFP_KERNEL); + if (!mgr->dev->dev) + goto out; + + mgr->dev->dev->release = mock_release; + mgr->dev->dev->init_name = PREFIX_STR " expected parse failure"; + device_initialize(mgr->dev->dev); + + rxmsg->curlen = 1; + rxmsg->msg[0] = req_type & 0x7f; + if (drm_dp_sideband_parse_req(mgr, rxmsg, out)) + drm_printf(&p, "Unexpectedly decoded invalid sideband request\n"); + else + result = true; +out: + kfree(out); + kfree(rxmsg); + if (mgr) { + if (mgr->dev) { + put_device(mgr->dev->dev); + kfree(mgr->dev); + } + kfree(mgr); + } return result; }

@@ -268,6 +365,34 @@ int igt_dp_mst_sideband_msg_req_decode(void *unused) in.u.enc_status.valid_stream_behavior = 1; DO_TEST();

+ in.req_type = DP_CONNECTION_STATUS_NOTIFY; + in.u.conn_stat.port_number = 0xf; + get_random_bytes(in.u.conn_stat.guid, sizeof(in.u.conn_stat.guid)); + in.u.conn_stat.legacy_device_plug_status = 1; + in.u.conn_stat.displayport_device_plug_status = 0; + in.u.conn_stat.message_capability_status = 0; + in.u.conn_stat.input_port = 0; + in.u.conn_stat.peer_device_type = 7; + DO_TEST(); + in.u.conn_stat.displayport_device_plug_status = 1; + DO_TEST(); + in.u.conn_stat.message_capability_status = 1; + DO_TEST(); + in.u.conn_stat.input_port = 1; + DO_TEST(); + + in.req_type = DP_RESOURCE_STATUS_NOTIFY; + in.u.resource_stat.port_number = 0xf; + get_random_bytes(in.u.resource_stat.guid, sizeof(in.u.resource_stat.guid)); + in.u.resource_stat.available_pbn = 0xcdef; + DO_TEST(); + +#undef DO_TEST +#define DO_TEST(req_type) FAIL_ON(!sideband_msg_req_parse(req_type)) + DO_TEST(DP_CONNECTION_STATUS_NOTIFY); + DO_TEST(DP_RESOURCE_STATUS_NOTIFY); + + DO_TEST(DP_REMOTE_I2C_WRITE); #undef DO_TEST return 0; }