--- /dev/null
+/*
+ * Copyright © 2017 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include "../i915_selftest.h"
+
+/* max doorbell number + negative test for each client type */
+#define ATTEMPTS (GUC_NUM_DOORBELLS + GUC_CLIENT_PRIORITY_NUM)
+
+struct intel_guc_client *clients[ATTEMPTS];
+
+static bool available_dbs(struct intel_guc *guc, u32 priority)
+{
+ unsigned long offset;
+ unsigned long end;
+ u16 id;
+
+ /* first half is used for normal priority, second half for high */
+ offset = 0;
+ end = GUC_NUM_DOORBELLS / 2;
+ if (priority <= GUC_CLIENT_PRIORITY_HIGH) {
+ offset = end;
+ end += offset;
+ }
+
+ id = find_next_zero_bit(guc->doorbell_bitmap, end, offset);
+ if (id < end)
+ return true;
+
+ return false;
+}
+
+static int check_all_doorbells(struct intel_guc *guc)
+{
+ u16 db_id;
+
+ pr_info_once("Max number of doorbells: %d", GUC_NUM_DOORBELLS);
+ for (db_id = 0; db_id < GUC_NUM_DOORBELLS; ++db_id) {
+ if (!doorbell_ok(guc, db_id)) {
+ pr_err("doorbell %d, not ok\n", db_id);
+ return -EIO;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Basic client sanity check, handy to validate create_clients.
+ */
+static int validate_client(struct intel_guc_client *client,
+ int client_priority,
+ bool is_preempt_client)
+{
+ struct drm_i915_private *dev_priv = guc_to_i915(client->guc);
+ struct i915_gem_context *ctx_owner = is_preempt_client ?
+ dev_priv->preempt_context : dev_priv->kernel_context;
+
+ if (client->owner != ctx_owner ||
+ client->engines != INTEL_INFO(dev_priv)->ring_mask ||
+ client->priority != client_priority ||
+ client->doorbell_id == GUC_DOORBELL_INVALID)
+ return -EINVAL;
+ else
+ return 0;
+}
+
+/*
+ * Check that guc_init_doorbell_hw is doing what it should.
+ *
+ * During GuC submission enable, we create GuC clients and their doorbells,
+ * but after resetting the microcontroller (resume & gpu reset), these
+ * GuC clients are still around, but the status of their doorbells may be
+ * incorrect. This is the reason behind validating that the doorbells status
+ * expected by the driver matches what the GuC/HW have.
+ */
+static int igt_guc_init_doorbell_hw(void *args)
+{
+ struct drm_i915_private *dev_priv = args;
+ struct intel_guc *guc;
+ DECLARE_BITMAP(db_bitmap_bk, GUC_NUM_DOORBELLS);
+ int i, err = 0;
+
+ GEM_BUG_ON(!HAS_GUC(dev_priv));
+ mutex_lock(&dev_priv->drm.struct_mutex);
+
+ guc = &dev_priv->guc;
+ if (!guc) {
+ pr_err("No guc object!\n");
+ err = -EINVAL;
+ goto unlock;
+ }
+
+ err = check_all_doorbells(guc);
+ if (err)
+ goto unlock;
+
+ /*
+ * Get rid of clients created during driver load because the test will
+ * recreate them.
+ */
+ guc_clients_destroy(guc);
+ if (guc->execbuf_client || guc->preempt_client) {
+ pr_err("guc_clients_destroy lied!\n");
+ err = -EINVAL;
+ goto unlock;
+ }
+
+ err = guc_clients_create(guc);
+ if (err) {
+ pr_err("Failed to create clients\n");
+ goto unlock;
+ }
+
+ err = validate_client(guc->execbuf_client,
+ GUC_CLIENT_PRIORITY_KMD_NORMAL, false);
+ if (err) {
+ pr_err("execbug client validation failed\n");
+ goto out;
+ }
+
+ err = validate_client(guc->preempt_client,
+ GUC_CLIENT_PRIORITY_KMD_HIGH, true);
+ if (err) {
+ pr_err("preempt client validation failed\n");
+ goto out;
+ }
+
+ /* each client should have received a doorbell during alloc */
+ if (!has_doorbell(guc->execbuf_client) ||
+ !has_doorbell(guc->preempt_client)) {
+ pr_err("guc_clients_create didn't create doorbells\n");
+ err = -EINVAL;
+ goto out;
+ }
+
+ /*
+ * Basic test - an attempt to reallocate a valid doorbell to the
+ * client it is currently assigned should not cause a failure.
+ */
+ err = guc_init_doorbell_hw(guc);
+ if (err)
+ goto out;
+
+ /*
+ * Negative test - a client with no doorbell (invalid db id).
+ * Each client gets a doorbell when it is created, after destroying
+ * the doorbell, the db id is changed to GUC_DOORBELL_INVALID and the
+ * firmware will reject any attempt to allocate a doorbell with an
+ * invalid id (db has to be reserved before allocation).
+ */
+ destroy_doorbell(guc->execbuf_client);
+ if (has_doorbell(guc->execbuf_client)) {
+ pr_err("destroy db did not work\n");
+ err = -EINVAL;
+ goto out;
+ }
+
+ err = guc_init_doorbell_hw(guc);
+ if (err != -EIO) {
+ pr_err("unexpected (err = %d)", err);
+ goto out;
+ }
+
+ if (!available_dbs(guc, guc->execbuf_client->priority)) {
+ pr_err("doorbell not available when it should\n");
+ err = -EIO;
+ goto out;
+ }
+
+ /* clean after test */
+ err = create_doorbell(guc->execbuf_client);
+ if (err) {
+ pr_err("recreate doorbell failed\n");
+ goto out;
+ }
+
+ /*
+ * Negative test - doorbell_bitmap out of sync, will trigger a few of
+ * WARN_ON(!doorbell_ok(guc, db_id)) but that's ok as long as the
+ * doorbells from our clients don't fail.
+ */
+ bitmap_copy(db_bitmap_bk, guc->doorbell_bitmap, GUC_NUM_DOORBELLS);
+ for (i = 0; i < GUC_NUM_DOORBELLS; i++)
+ if (i % 2)
+ test_and_change_bit(i, guc->doorbell_bitmap);
+
+ err = guc_init_doorbell_hw(guc);
+ if (err) {
+ pr_err("out of sync doorbell caused an error\n");
+ goto out;
+ }
+
+ /* restore 'correct' db bitmap */
+ bitmap_copy(guc->doorbell_bitmap, db_bitmap_bk, GUC_NUM_DOORBELLS);
+ err = guc_init_doorbell_hw(guc);
+ if (err) {
+ pr_err("restored doorbell caused an error\n");
+ goto out;
+ }
+
+out:
+ /*
+ * Leave clean state for other test, plus the driver always destroy the
+ * clients during unload.
+ */
+ guc_clients_destroy(guc);
+ guc_clients_create(guc);
+unlock:
+ mutex_unlock(&dev_priv->drm.struct_mutex);
+ return err;
+}
+
+/*
+ * Create as many clients as number of doorbells. Note that there's already
+ * client(s)/doorbell(s) created during driver load, but this test creates
+ * its own and do not interact with the existing ones.
+ */
+static int igt_guc_doorbells(void *arg)
+{
+ struct drm_i915_private *dev_priv = arg;
+ struct intel_guc *guc;
+ int i, err = 0;
+ u16 db_id;
+
+ GEM_BUG_ON(!HAS_GUC(dev_priv));
+ mutex_lock(&dev_priv->drm.struct_mutex);
+
+ guc = &dev_priv->guc;
+ if (!guc) {
+ pr_err("No guc object!\n");
+ err = -EINVAL;
+ goto unlock;
+ }
+
+ err = check_all_doorbells(guc);
+ if (err)
+ goto unlock;
+
+ for (i = 0; i < ATTEMPTS; i++) {
+ clients[i] = guc_client_alloc(dev_priv,
+ INTEL_INFO(dev_priv)->ring_mask,
+ i % GUC_CLIENT_PRIORITY_NUM,
+ dev_priv->kernel_context);
+
+ if (!clients[i]) {
+ pr_err("[%d] No guc client\n", i);
+ err = -EINVAL;
+ goto out;
+ }
+
+ if (IS_ERR(clients[i])) {
+ if (PTR_ERR(clients[i]) != -ENOSPC) {
+ pr_err("[%d] unexpected error\n", i);
+ err = PTR_ERR(clients[i]);
+ goto out;
+ }
+
+ if (available_dbs(guc, i % GUC_CLIENT_PRIORITY_NUM)) {
+ pr_err("[%d] non-db related alloc fail\n", i);
+ err = -EINVAL;
+ goto out;
+ }
+
+ /* expected, ran out of dbs for this client type */
+ continue;
+ }
+
+ /*
+ * The check below is only valid because we keep a doorbell
+ * assigned during the whole life of the client.
+ */
+ if (clients[i]->stage_id >= GUC_NUM_DOORBELLS) {
+ pr_err("[%d] more clients than doorbells (%d >= %d)\n",
+ i, clients[i]->stage_id, GUC_NUM_DOORBELLS);
+ err = -EINVAL;
+ goto out;
+ }
+
+ err = validate_client(clients[i],
+ i % GUC_CLIENT_PRIORITY_NUM, false);
+ if (err) {
+ pr_err("[%d] client_alloc sanity check failed!\n", i);
+ err = -EINVAL;
+ goto out;
+ }
+
+ db_id = clients[i]->doorbell_id;
+
+ /*
+ * Client alloc gives us a doorbell, but we want to exercise
+ * this ourselves (this resembles guc_init_doorbell_hw)
+ */
+ destroy_doorbell(clients[i]);
+ if (clients[i]->doorbell_id != GUC_DOORBELL_INVALID) {
+ pr_err("[%d] destroy db did not work!\n", i);
+ err = -EINVAL;
+ goto out;
+ }
+
+ err = __reserve_doorbell(clients[i]);
+ if (err) {
+ pr_err("[%d] Failed to reserve a doorbell\n", i);
+ goto out;
+ }
+
+ __update_doorbell_desc(clients[i], clients[i]->doorbell_id);
+ err = __create_doorbell(clients[i]);
+ if (err) {
+ pr_err("[%d] Failed to create a doorbell\n", i);
+ goto out;
+ }
+
+ /* doorbell id shouldn't change, we are holding the mutex */
+ if (db_id != clients[i]->doorbell_id) {
+ pr_err("[%d] doorbell id changed (%d != %d)\n",
+ i, db_id, clients[i]->doorbell_id);
+ err = -EINVAL;
+ goto out;
+ }
+
+ err = check_all_doorbells(guc);
+ if (err)
+ goto out;
+ }
+
+out:
+ for (i = 0; i < ATTEMPTS; i++)
+ if (!IS_ERR_OR_NULL(clients[i]))
+ guc_client_free(clients[i]);
+unlock:
+ mutex_unlock(&dev_priv->drm.struct_mutex);
+ return err;
+}
+
+int intel_guc_live_selftest(struct drm_i915_private *dev_priv)
+{
+ static const struct i915_subtest tests[] = {
+ SUBTEST(igt_guc_init_doorbell_hw),
+ SUBTEST(igt_guc_doorbells),
+ };
+
+ if (!i915_modparams.enable_guc_submission)
+ return 0;
+
+ return i915_subtests(tests, dev_priv);
+}
projects / users / jedix / linux-maple.git / commitdiff