Quelle  xe_guc_relay_test.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0 AND MIT
/*
 * Copyright © 2023 Intel Corporation
 */

#include <kunit/static_stub.h>
#include <kunit/test.h>
#include <kunit/test-bug.h>

#include "xe_device.h"
#include "xe_kunit_helpers.h"
#include "xe_pci_test.h"

#define TEST_RID 1234
#define TEST_VFID 5
#define TEST_LEN 6
#define TEST_ACTION 0xa
#define TEST_DATA(n) (0xd0 + (n))

static int replacement_relay_get_totalvfs(struct xe_guc_relay *relay)
{
 return TEST_VFID;
}

static int relay_test_init(struct kunit *test)
{
 struct xe_pci_fake_data fake = {
  .sriov_mode = XE_SRIOV_MODE_PF,
  .platform = XE_TIGERLAKE, /* some random platform */
  .subplatform = XE_SUBPLATFORM_NONE,
 };
 struct xe_guc_relay *relay;
 struct xe_device *xe;

 test->priv = &fake;
 xe_kunit_helper_xe_device_test_init(test);

 xe = test->priv;
 KUNIT_ASSERT_EQ(test, xe_sriov_init(xe), 0);

 relay = &xe_device_get_gt(xe, 0)->uc.guc.relay;
 kunit_activate_static_stub(test, relay_get_totalvfs,
       replacement_relay_get_totalvfs);

 KUNIT_ASSERT_EQ(test, xe_guc_relay_init(relay), 0);
 KUNIT_EXPECT_TRUE(test, relay_is_ready(relay));
 relay->last_rid = TEST_RID - 1;

 test->priv = relay;
 return 0;
}

static const u32 TEST_MSG[TEST_LEN] = {
 FIELD_PREP_CONST(GUC_HXG_MSG_0_ORIGIN, GUC_HXG_ORIGIN_HOST) |
 FIELD_PREP_CONST(GUC_HXG_MSG_0_TYPE, GUC_HXG_TYPE_EVENT) |
 FIELD_PREP_CONST(GUC_HXG_EVENT_MSG_0_ACTION, TEST_ACTION) |
 FIELD_PREP_CONST(GUC_HXG_EVENT_MSG_0_DATA0, TEST_DATA(0)),
 TEST_DATA(1), TEST_DATA(2), TEST_DATA(3), TEST_DATA(4),
};

static int replacement_xe_guc_ct_send_recv_always_fails(struct xe_guc_ct *ct,
       const u32 *msg, u32 len,
       u32 *response_buffer)
{
 struct kunit *test = kunit_get_current_test();

 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ct);
 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, msg);
 KUNIT_ASSERT_GE(test, len, GUC_HXG_MSG_MIN_LEN);

 return -ECOMM;
}

static int replacement_xe_guc_ct_send_recv_expects_pf2guc_relay(struct xe_guc_ct *ct,
        const u32 *msg, u32 len,
        u32 *response_buffer)
{
 struct kunit *test = kunit_get_current_test();

 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ct);
 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, msg);
 KUNIT_ASSERT_GE(test, len, PF2GUC_RELAY_TO_VF_REQUEST_MSG_MIN_LEN);
 KUNIT_ASSERT_EQ(test, len, PF2GUC_RELAY_TO_VF_REQUEST_MSG_MIN_LEN + TEST_LEN);
 KUNIT_EXPECT_EQ(test, GUC_HXG_ORIGIN_HOST, FIELD_GET(GUC_HXG_MSG_0_ORIGIN, msg[0]));
 KUNIT_EXPECT_EQ(test, GUC_HXG_TYPE_REQUEST, FIELD_GET(GUC_HXG_MSG_0_TYPE, msg[0]));
 KUNIT_EXPECT_EQ(test, XE_GUC_ACTION_PF2GUC_RELAY_TO_VF,
   FIELD_GET(GUC_HXG_REQUEST_MSG_0_ACTION, msg[0]));
 KUNIT_EXPECT_EQ(test, TEST_VFID,
   FIELD_GET(PF2GUC_RELAY_TO_VF_REQUEST_MSG_1_VFID, msg[1]));
 KUNIT_EXPECT_EQ(test, TEST_RID,
   FIELD_GET(PF2GUC_RELAY_TO_VF_REQUEST_MSG_2_RELAY_ID, msg[2]));
 KUNIT_EXPECT_MEMEQ(test, TEST_MSG, msg + PF2GUC_RELAY_TO_VF_REQUEST_MSG_MIN_LEN,
      sizeof(u32) * TEST_LEN);
 return 0;
}

static const u32 test_guc2pf[GUC2PF_RELAY_FROM_VF_EVENT_MSG_MAX_LEN] = {
 /* transport */
 FIELD_PREP_CONST(GUC_HXG_MSG_0_ORIGIN, GUC_HXG_ORIGIN_GUC) |
 FIELD_PREP_CONST(GUC_HXG_MSG_0_TYPE, GUC_HXG_TYPE_EVENT) |
 FIELD_PREP_CONST(GUC_HXG_EVENT_MSG_0_ACTION, XE_GUC_ACTION_GUC2PF_RELAY_FROM_VF),
 FIELD_PREP_CONST(GUC2PF_RELAY_FROM_VF_EVENT_MSG_1_VFID, TEST_VFID),
 FIELD_PREP_CONST(GUC2PF_RELAY_FROM_VF_EVENT_MSG_2_RELAY_ID, TEST_RID),
 /* payload */
 FIELD_PREP_CONST(GUC_HXG_MSG_0_ORIGIN, GUC_HXG_ORIGIN_HOST) |
 FIELD_PREP_CONST(GUC_HXG_MSG_0_TYPE, GUC_HXG_TYPE_RESPONSE_SUCCESS),
};

static const u32 test_guc2vf[GUC2VF_RELAY_FROM_PF_EVENT_MSG_MAX_LEN] = {
 /* transport */
 FIELD_PREP_CONST(GUC_HXG_MSG_0_ORIGIN, GUC_HXG_ORIGIN_GUC) |
 FIELD_PREP_CONST(GUC_HXG_MSG_0_TYPE, GUC_HXG_TYPE_EVENT) |
 FIELD_PREP_CONST(GUC_HXG_EVENT_MSG_0_ACTION, XE_GUC_ACTION_GUC2VF_RELAY_FROM_PF),
 FIELD_PREP_CONST(GUC2VF_RELAY_FROM_PF_EVENT_MSG_1_RELAY_ID, TEST_RID),
 /* payload */
 FIELD_PREP_CONST(GUC_HXG_MSG_0_ORIGIN, GUC_HXG_ORIGIN_HOST) |
 FIELD_PREP_CONST(GUC_HXG_MSG_0_TYPE, GUC_HXG_TYPE_RESPONSE_SUCCESS),
};

static void pf_rejects_guc2pf_too_short(struct kunit *test)
{
 const u32 len = GUC2PF_RELAY_FROM_VF_EVENT_MSG_MIN_LEN - 1;
 struct xe_guc_relay *relay = test->priv;
 const u32 *msg = test_guc2pf;

 KUNIT_ASSERT_EQ(test, -EPROTO, xe_guc_relay_process_guc2pf(relay, msg, len));
}

static void pf_rejects_guc2pf_too_long(struct kunit *test)
{
 const u32 len = GUC2PF_RELAY_FROM_VF_EVENT_MSG_MAX_LEN + 1;
 struct xe_guc_relay *relay = test->priv;
 const u32 *msg = test_guc2pf;

 KUNIT_ASSERT_EQ(test, -EMSGSIZE, xe_guc_relay_process_guc2pf(relay, msg, len));
}

static void pf_rejects_guc2pf_no_payload(struct kunit *test)
{
 const u32 len = GUC2PF_RELAY_FROM_VF_EVENT_MSG_MIN_LEN;
 struct xe_guc_relay *relay = test->priv;
 const u32 *msg = test_guc2pf;

 KUNIT_ASSERT_EQ(test, -EPROTO, xe_guc_relay_process_guc2pf(relay, msg, len));
}

static void pf_fails_no_payload(struct kunit *test)
{
 struct xe_guc_relay *relay = test->priv;
 const u32 msg = 0;

 KUNIT_ASSERT_EQ(test, -EPROTO, relay_process_msg(relay, TEST_VFID, TEST_RID, &msg, 0));
}

static void pf_fails_bad_origin(struct kunit *test)
{
 struct xe_guc_relay *relay = test->priv;
 static const u32 msg[] = {
  FIELD_PREP_CONST(GUC_HXG_MSG_0_ORIGIN, GUC_HXG_ORIGIN_GUC) |
  FIELD_PREP_CONST(GUC_HXG_MSG_0_TYPE, GUC_HXG_TYPE_RESPONSE_SUCCESS),
 };
 u32 len = ARRAY_SIZE(msg);

 KUNIT_ASSERT_EQ(test, -EPROTO, relay_process_msg(relay, TEST_VFID, TEST_RID, msg, len));
}

static void pf_fails_bad_type(struct kunit *test)
{
 struct xe_guc_relay *relay = test->priv;
 const u32 msg[] = {
  FIELD_PREP(GUC_HXG_MSG_0_ORIGIN, GUC_HXG_ORIGIN_HOST) |
  FIELD_PREP(GUC_HXG_MSG_0_TYPE, 4), /* only 4 is undefined */
 };
 u32 len = ARRAY_SIZE(msg);

 KUNIT_ASSERT_EQ(test, -EBADRQC, relay_process_msg(relay, TEST_VFID, TEST_RID, msg, len));
}

static void pf_txn_reports_error(struct kunit *test)
{
 struct xe_guc_relay *relay = test->priv;
 struct relay_transaction *txn;

 txn = __relay_get_transaction(relay, false, TEST_VFID, TEST_RID,
          TEST_MSG, TEST_LEN, NULL, 0);
 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, txn);

 kunit_activate_static_stub(test, xe_guc_ct_send_recv,
       replacement_xe_guc_ct_send_recv_always_fails);
 KUNIT_EXPECT_EQ(test, -ECOMM, relay_send_transaction(relay, txn));

 relay_release_transaction(relay, txn);
}

static void pf_txn_sends_pf2guc(struct kunit *test)
{
 struct xe_guc_relay *relay = test->priv;
 struct relay_transaction *txn;

 txn = __relay_get_transaction(relay, false, TEST_VFID, TEST_RID,
          TEST_MSG, TEST_LEN, NULL, 0);
 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, txn);

 kunit_activate_static_stub(test, xe_guc_ct_send_recv,
       replacement_xe_guc_ct_send_recv_expects_pf2guc_relay);
 KUNIT_ASSERT_EQ(test, 0, relay_send_transaction(relay, txn));

 relay_release_transaction(relay, txn);
}

static void pf_sends_pf2guc(struct kunit *test)
{
 struct xe_guc_relay *relay = test->priv;

 kunit_activate_static_stub(test, xe_guc_ct_send_recv,
       replacement_xe_guc_ct_send_recv_expects_pf2guc_relay);
 KUNIT_ASSERT_EQ(test, 0,
   xe_guc_relay_send_to_vf(relay, TEST_VFID,
      TEST_MSG, TEST_LEN, NULL, 0));
}

static int replacement_xe_guc_ct_send_recv_loopback_relay(struct xe_guc_ct *ct,
         const u32 *msg, u32 len,
         u32 *response_buffer)
{
 struct kunit *test = kunit_get_current_test();
 struct xe_guc_relay *relay = test->priv;
 u32 *reply = kunit_kzalloc(test, len * sizeof(u32), GFP_KERNEL);
 int (*guc2relay)(struct xe_guc_relay *, const u32 *, u32);
 u32 action;
 int err;

 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ct);
 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, msg);
 KUNIT_ASSERT_GE(test, len, GUC_HXG_MSG_MIN_LEN);
 KUNIT_ASSERT_EQ(test, GUC_HXG_TYPE_REQUEST,
   FIELD_GET(GUC_HXG_MSG_0_TYPE, msg[0]));
 KUNIT_ASSERT_GE(test, len, GUC_HXG_REQUEST_MSG_MIN_LEN);
 KUNIT_ASSERT_NOT_NULL(test, reply);

 switch (FIELD_GET(GUC_HXG_REQUEST_MSG_0_ACTION, msg[0])) {
 case XE_GUC_ACTION_PF2GUC_RELAY_TO_VF:
  KUNIT_ASSERT_GE(test, len, PF2GUC_RELAY_TO_VF_REQUEST_MSG_MIN_LEN);
  action = XE_GUC_ACTION_GUC2PF_RELAY_FROM_VF;
  guc2relay = xe_guc_relay_process_guc2pf;
  break;
 case XE_GUC_ACTION_VF2GUC_RELAY_TO_PF:
  KUNIT_ASSERT_GE(test, len, VF2GUC_RELAY_TO_PF_REQUEST_MSG_MIN_LEN);
  action = XE_GUC_ACTION_GUC2VF_RELAY_FROM_PF;
  guc2relay = xe_guc_relay_process_guc2vf;
  break;
 default:
  KUNIT_FAIL(test, "bad RELAY action %#x", msg[0]);
  return -EINVAL;
 }

 reply[0] = FIELD_PREP(GUC_HXG_MSG_0_ORIGIN, GUC_HXG_ORIGIN_GUC) |
     FIELD_PREP(GUC_HXG_MSG_0_TYPE, GUC_HXG_TYPE_EVENT) |
     FIELD_PREP(GUC_HXG_EVENT_MSG_0_ACTION, action);
 memcpy(reply + 1, msg + 1, sizeof(u32) * (len - 1));

 err = guc2relay(relay, reply, len);
 KUNIT_EXPECT_EQ(test, err, 0);

 return err;
}

static void test_requires_relay_testloop(struct kunit *test)
{
 /*
 * The debug relay action GUC_RELAY_ACTION_VFXPF_TESTLOOP is available
 * only on builds with CONFIG_DRM_XE_DEBUG_SRIOV enabled.
 * See "kunit.py --kconfig_add" option if it's missing.
 */
 if (!IS_ENABLED(CONFIG_DRM_XE_DEBUG_SRIOV))
  kunit_skip(test, "requires %s\n", __stringify(CONFIG_DRM_XE_DEBUG_SRIOV));
}

static void pf_loopback_nop(struct kunit *test)
{
 struct xe_guc_relay *relay = test->priv;
 u32 request[] = {
  FIELD_PREP(GUC_HXG_MSG_0_ORIGIN, GUC_HXG_ORIGIN_HOST) |
  FIELD_PREP(GUC_HXG_MSG_0_TYPE, GUC_HXG_TYPE_REQUEST) |
  FIELD_PREP(GUC_HXG_REQUEST_MSG_0_ACTION, GUC_RELAY_ACTION_VFXPF_TESTLOOP) |
  FIELD_PREP(GUC_HXG_REQUEST_MSG_0_DATA0, VFXPF_TESTLOOP_OPCODE_NOP),
 };
 u32 response[GUC_HXG_RESPONSE_MSG_MIN_LEN];
 int ret;

 test_requires_relay_testloop(test);

 kunit_activate_static_stub(test, relay_kick_worker, relay_process_incoming_action);
 kunit_activate_static_stub(test, xe_guc_ct_send_recv,
       replacement_xe_guc_ct_send_recv_loopback_relay);
 ret = xe_guc_relay_send_to_vf(relay, TEST_VFID,
          request, ARRAY_SIZE(request),
          response, ARRAY_SIZE(response));
 KUNIT_ASSERT_EQ(test, ret, GUC_HXG_RESPONSE_MSG_MIN_LEN);
 KUNIT_EXPECT_EQ(test, FIELD_GET(GUC_HXG_MSG_0_ORIGIN, response[0]),
   GUC_HXG_ORIGIN_HOST);
 KUNIT_EXPECT_EQ(test, FIELD_GET(GUC_HXG_MSG_0_TYPE, response[0]),
   GUC_HXG_TYPE_RESPONSE_SUCCESS);
 KUNIT_EXPECT_EQ(test, FIELD_GET(GUC_HXG_RESPONSE_MSG_0_DATA0, response[0]), 0);
}

static void pf_loopback_echo(struct kunit *test)
{
 struct xe_guc_relay *relay = test->priv;
 u32 request[] = {
  FIELD_PREP(GUC_HXG_MSG_0_ORIGIN, GUC_HXG_ORIGIN_HOST) |
  FIELD_PREP(GUC_HXG_MSG_0_TYPE, GUC_HXG_TYPE_REQUEST) |
  FIELD_PREP(GUC_HXG_REQUEST_MSG_0_ACTION, GUC_RELAY_ACTION_VFXPF_TESTLOOP) |
  FIELD_PREP(GUC_HXG_REQUEST_MSG_0_DATA0, VFXPF_TESTLOOP_OPCODE_ECHO),
  TEST_DATA(1), TEST_DATA(2), TEST_DATA(3), TEST_DATA(4),
 };
 u32 response[ARRAY_SIZE(request)];
 unsigned int n;
 int ret;

 test_requires_relay_testloop(test);

 kunit_activate_static_stub(test, relay_kick_worker, relay_process_incoming_action);
 kunit_activate_static_stub(test, xe_guc_ct_send_recv,
       replacement_xe_guc_ct_send_recv_loopback_relay);
 ret = xe_guc_relay_send_to_vf(relay, TEST_VFID,
          request, ARRAY_SIZE(request),
          response, ARRAY_SIZE(response));
 KUNIT_ASSERT_EQ(test, ret, ARRAY_SIZE(response));
 KUNIT_EXPECT_EQ(test, FIELD_GET(GUC_HXG_MSG_0_ORIGIN, response[0]),
   GUC_HXG_ORIGIN_HOST);
 KUNIT_EXPECT_EQ(test, FIELD_GET(GUC_HXG_MSG_0_TYPE, response[0]),
   GUC_HXG_TYPE_RESPONSE_SUCCESS);
 KUNIT_EXPECT_EQ(test, FIELD_GET(GUC_HXG_RESPONSE_MSG_0_DATA0, response[0]),
   ARRAY_SIZE(response));
 for (n = GUC_HXG_RESPONSE_MSG_MIN_LEN; n < ret; n++)
  KUNIT_EXPECT_EQ(test, request[n], response[n]);
}

static void pf_loopback_fail(struct kunit *test)
{
 struct xe_guc_relay *relay = test->priv;
 u32 request[] = {
  FIELD_PREP(GUC_HXG_MSG_0_ORIGIN, GUC_HXG_ORIGIN_HOST) |
  FIELD_PREP(GUC_HXG_MSG_0_TYPE, GUC_HXG_TYPE_REQUEST) |
  FIELD_PREP(GUC_HXG_REQUEST_MSG_0_ACTION, GUC_RELAY_ACTION_VFXPF_TESTLOOP) |
  FIELD_PREP(GUC_HXG_REQUEST_MSG_0_DATA0, VFXPF_TESTLOOP_OPCODE_FAIL),
 };
 u32 response[GUC_HXG_RESPONSE_MSG_MIN_LEN];
 int ret;

 test_requires_relay_testloop(test);

 kunit_activate_static_stub(test, relay_kick_worker, relay_process_incoming_action);
 kunit_activate_static_stub(test, xe_guc_ct_send_recv,
       replacement_xe_guc_ct_send_recv_loopback_relay);
 ret = xe_guc_relay_send_to_vf(relay, TEST_VFID,
          request, ARRAY_SIZE(request),
          response, ARRAY_SIZE(response));
 KUNIT_ASSERT_EQ(test, ret, -EREMOTEIO);
}

static void pf_loopback_busy(struct kunit *test)
{
 struct xe_guc_relay *relay = test->priv;
 u32 request[] = {
  FIELD_PREP(GUC_HXG_MSG_0_ORIGIN, GUC_HXG_ORIGIN_HOST) |
  FIELD_PREP(GUC_HXG_MSG_0_TYPE, GUC_HXG_TYPE_REQUEST) |
  FIELD_PREP(GUC_HXG_REQUEST_MSG_0_ACTION, GUC_RELAY_ACTION_VFXPF_TESTLOOP) |
  FIELD_PREP(GUC_HXG_REQUEST_MSG_0_DATA0, VFXPF_TESTLOOP_OPCODE_BUSY),
  TEST_DATA(0xb),
 };
 u32 response[GUC_HXG_RESPONSE_MSG_MIN_LEN];
 int ret;

 test_requires_relay_testloop(test);

 kunit_activate_static_stub(test, relay_testonly_nop, relay_process_incoming_action);
 kunit_activate_static_stub(test, relay_kick_worker, relay_process_incoming_action);
 kunit_activate_static_stub(test, xe_guc_ct_send_recv,
       replacement_xe_guc_ct_send_recv_loopback_relay);
 ret = xe_guc_relay_send_to_vf(relay, TEST_VFID,
          request, ARRAY_SIZE(request),
          response, ARRAY_SIZE(response));
 KUNIT_ASSERT_EQ(test, ret, GUC_HXG_RESPONSE_MSG_MIN_LEN);
}

static void pf_loopback_retry(struct kunit *test)
{
 struct xe_guc_relay *relay = test->priv;
 u32 request[] = {
  FIELD_PREP(GUC_HXG_MSG_0_ORIGIN, GUC_HXG_ORIGIN_HOST) |
  FIELD_PREP(GUC_HXG_MSG_0_TYPE, GUC_HXG_TYPE_REQUEST) |
  FIELD_PREP(GUC_HXG_REQUEST_MSG_0_ACTION, GUC_RELAY_ACTION_VFXPF_TESTLOOP) |
  FIELD_PREP(GUC_HXG_REQUEST_MSG_0_DATA0, VFXPF_TESTLOOP_OPCODE_RETRY),
  TEST_DATA(0xd), TEST_DATA(0xd),
 };
 u32 response[GUC_HXG_RESPONSE_MSG_MIN_LEN];
 int ret;

 test_requires_relay_testloop(test);

 kunit_activate_static_stub(test, relay_kick_worker, relay_process_incoming_action);
 kunit_activate_static_stub(test, xe_guc_ct_send_recv,
       replacement_xe_guc_ct_send_recv_loopback_relay);
 ret = xe_guc_relay_send_to_vf(relay, TEST_VFID,
          request, ARRAY_SIZE(request),
          response, ARRAY_SIZE(response));
 KUNIT_ASSERT_EQ(test, ret, GUC_HXG_RESPONSE_MSG_MIN_LEN);
}

static struct kunit_case pf_relay_test_cases[] = {
 KUNIT_CASE(pf_rejects_guc2pf_too_short),
 KUNIT_CASE(pf_rejects_guc2pf_too_long),
 KUNIT_CASE(pf_rejects_guc2pf_no_payload),
 KUNIT_CASE(pf_fails_no_payload),
 KUNIT_CASE(pf_fails_bad_origin),
 KUNIT_CASE(pf_fails_bad_type),
 KUNIT_CASE(pf_txn_reports_error),
 KUNIT_CASE(pf_txn_sends_pf2guc),
 KUNIT_CASE(pf_sends_pf2guc),
 KUNIT_CASE(pf_loopback_nop),
 KUNIT_CASE(pf_loopback_echo),
 KUNIT_CASE(pf_loopback_fail),
 KUNIT_CASE_SLOW(pf_loopback_busy),
 KUNIT_CASE_SLOW(pf_loopback_retry),
 {}
};

static struct kunit_suite pf_relay_suite = {
 .name = "pf_relay",
 .test_cases = pf_relay_test_cases,
 .init = relay_test_init,
};

static void vf_rejects_guc2vf_too_short(struct kunit *test)
{
 const u32 len = GUC2VF_RELAY_FROM_PF_EVENT_MSG_MIN_LEN - 1;
 struct xe_guc_relay *relay = test->priv;
 const u32 *msg = test_guc2vf;

 KUNIT_ASSERT_EQ(test, -EPROTO, xe_guc_relay_process_guc2vf(relay, msg, len));
}

static void vf_rejects_guc2vf_too_long(struct kunit *test)
{
 const u32 len = GUC2VF_RELAY_FROM_PF_EVENT_MSG_MAX_LEN + 1;
 struct xe_guc_relay *relay = test->priv;
 const u32 *msg = test_guc2vf;

 KUNIT_ASSERT_EQ(test, -EMSGSIZE, xe_guc_relay_process_guc2vf(relay, msg, len));
}

static void vf_rejects_guc2vf_no_payload(struct kunit *test)
{
 const u32 len = GUC2VF_RELAY_FROM_PF_EVENT_MSG_MIN_LEN;
 struct xe_guc_relay *relay = test->priv;
 const u32 *msg = test_guc2vf;

 KUNIT_ASSERT_EQ(test, -EPROTO, xe_guc_relay_process_guc2vf(relay, msg, len));
}

static struct kunit_case vf_relay_test_cases[] = {
 KUNIT_CASE(vf_rejects_guc2vf_too_short),
 KUNIT_CASE(vf_rejects_guc2vf_too_long),
 KUNIT_CASE(vf_rejects_guc2vf_no_payload),
 {}
};

static struct kunit_suite vf_relay_suite = {
 .name = "vf_relay",
 .test_cases = vf_relay_test_cases,
 .init = relay_test_init,
};

static void xe_drops_guc2pf_if_not_ready(struct kunit *test)
{
 struct xe_device *xe = test->priv;
 struct xe_guc_relay *relay = &xe_device_get_gt(xe, 0)->uc.guc.relay;
 const u32 *msg = test_guc2pf;
 u32 len = GUC2PF_RELAY_FROM_VF_EVENT_MSG_MIN_LEN + GUC_RELAY_MSG_MIN_LEN;

 KUNIT_ASSERT_EQ(test, -ENODEV, xe_guc_relay_process_guc2pf(relay, msg, len));
}

static void xe_drops_guc2vf_if_not_ready(struct kunit *test)
{
 struct xe_device *xe = test->priv;
 struct xe_guc_relay *relay = &xe_device_get_gt(xe, 0)->uc.guc.relay;
 const u32 *msg = test_guc2vf;
 u32 len = GUC2VF_RELAY_FROM_PF_EVENT_MSG_MIN_LEN + GUC_RELAY_MSG_MIN_LEN;

 KUNIT_ASSERT_EQ(test, -ENODEV, xe_guc_relay_process_guc2vf(relay, msg, len));
}

static void xe_rejects_send_if_not_ready(struct kunit *test)
{
 struct xe_device *xe = test->priv;
 struct xe_guc_relay *relay = &xe_device_get_gt(xe, 0)->uc.guc.relay;
 u32 msg[GUC_RELAY_MSG_MIN_LEN];
 u32 len = ARRAY_SIZE(msg);

 KUNIT_ASSERT_EQ(test, -ENODEV, xe_guc_relay_send_to_pf(relay, msg, len, NULL, 0));
 KUNIT_ASSERT_EQ(test, -ENODEV, relay_send_to(relay, TEST_VFID, msg, len, NULL, 0));
}

static struct kunit_case no_relay_test_cases[] = {
 KUNIT_CASE(xe_drops_guc2pf_if_not_ready),
 KUNIT_CASE(xe_drops_guc2vf_if_not_ready),
 KUNIT_CASE(xe_rejects_send_if_not_ready),
 {}
};

static struct kunit_suite no_relay_suite = {
 .name = "no_relay",
 .test_cases = no_relay_test_cases,
 .init = xe_kunit_helper_xe_device_test_init,
};

kunit_test_suites(&no_relay_suite,
    &pf_relay_suite,
    &vf_relay_suite);