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* 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)
static 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;
}
static bool client_doorbell_in_sync(struct intel_guc_client *client)
{
return !client || doorbell_ok(client->guc, client->doorbell_id);
}
/*
* Check that we're able to synchronize guc_clients with their doorbells
*
* We're creating clients and reserving doorbells once, at module load. During
* module lifetime, GuC, doorbell HW, and i915 state may go out of sync due to
* GuC being reset. In other words - 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_clients(void *args)
{
struct drm_i915_private *dev_priv = args;
struct intel_guc *guc;
int 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;
}
GEM_BUG_ON(!guc->execbuf_client);
err = validate_client(guc->execbuf_client,
GUC_CLIENT_PRIORITY_KMD_NORMAL, false);
if (err) {
pr_err("execbug client validation failed\n");
goto out;
}
if (guc->preempt_client) {
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 now have reserved a doorbell */
if (!has_doorbell(guc->execbuf_client) ||
(guc->preempt_client && !has_doorbell(guc->preempt_client))) {
pr_err("guc_clients_create didn't reserve doorbells\n");
err = -EINVAL;
goto out;
}
/* Now create the doorbells */
guc_clients_doorbell_init(guc);
/* each client should now have received a doorbell */
if (!client_doorbell_in_sync(guc->execbuf_client) ||
!client_doorbell_in_sync(guc->preempt_client)) {
pr_err("failed to initialize the 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_clients_doorbell_init(guc);
if (err)
goto out;
/*
* Negative test - a client with no doorbell (invalid db id).
* 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 (client_doorbell_in_sync(guc->execbuf_client)) {
pr_err("destroy db did not work\n");
err = -EINVAL;
goto out;
}
unreserve_doorbell(guc->execbuf_client);
__create_doorbell(guc->execbuf_client);
err = __guc_allocate_doorbell(guc, guc->execbuf_client->stage_id);
if (err != -EIO) {
pr_err("unexpected (err = %d)", err);
goto out_db;
}
if (!available_dbs(guc, guc->execbuf_client->priority)) {
pr_err("doorbell not available when it should\n");
err = -EIO;
goto out_db;
}
out_db:
/* clean after test */
__destroy_doorbell(guc->execbuf_client);
err = reserve_doorbell(guc->execbuf_client);
if (err) {
pr_err("failed to reserve back the doorbell back\n");
}
err = create_doorbell(guc->execbuf_client);
if (err) {
pr_err("recreate doorbell failed\n");
goto out;
}
out:
/*
* Leave clean state for other test, plus the driver always destroy the
* clients during unload.
*/
destroy_doorbell(guc->execbuf_client);
if (guc->preempt_client)
destroy_doorbell(guc->preempt_client);
guc_clients_destroy(guc);
guc_clients_create(guc);
guc_clients_doorbell_init(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;
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])) {
destroy_doorbell(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_clients),
SUBTEST(igt_guc_doorbells),
};
if (!USES_GUC_SUBMISSION(dev_priv))
return 0;
return i915_subtests(tests, dev_priv);
}
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