Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108622
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Jon Ewins <jon.ewins@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_debugfs.c | 5 -
drivers/gpu/drm/i915/intel_guc.c | 31 ---
drivers/gpu/drm/i915/intel_guc.h | 9 -
drivers/gpu/drm/i915/intel_guc_submission.c | 203 +-----------------
drivers/gpu/drm/i915/intel_ringbuffer.h | 2 -
drivers/gpu/drm/i915/selftests/intel_guc.c | 17 +-
.../gpu/drm/i915/selftests/intel_hangcheck.c | 3 -
7 files changed, 5 insertions(+), 265 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 2aeea977283f..636e28367980 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2233,11 +2233,6 @@ static int i915_guc_info(struct seq_file *m, void *data)
seq_printf(m, "\nGuC execbuf client @ %p:\n", guc->execbuf_client);
i915_guc_client_info(m, dev_priv, guc->execbuf_client);
- if (guc->preempt_client) {
- seq_printf(m, "\nGuC preempt client @ %p:\n",
- guc->preempt_client);
- i915_guc_client_info(m, dev_priv, guc->preempt_client);
- }
/* Add more as required ... */
diff --git a/drivers/gpu/drm/i915/intel_guc.c b/drivers/gpu/drm/i915/intel_guc.c
index 8660af3fd755..8fa2de84d82e 100644
--- a/drivers/gpu/drm/i915/intel_guc.c
+++ b/drivers/gpu/drm/i915/intel_guc.c
@@ -76,8 +76,6 @@ void intel_guc_init_early(struct intel_guc *guc)
static int guc_init_wq(struct intel_guc *guc)
{
- struct drm_i915_private *dev_priv = guc_to_i915(guc);
-
/*
* GuC log buffer flush work item has to do register access to
* send the ack to GuC and this work item, if not synced before
@@ -97,31 +95,6 @@ static int guc_init_wq(struct intel_guc *guc)
return -ENOMEM;
}
- /*
- * Even though both sending GuC action, and adding a new workitem to
- * GuC workqueue are serialized (each with its own locking), since
- * we're using mutliple engines, it's possible that we're going to
- * issue a preempt request with two (or more - each for different
- * engine) workitems in GuC queue. In this situation, GuC may submit
- * all of them, which will make us very confused.
- * Our preemption contexts may even already be complete - before we
- * even had the chance to sent the preempt action to GuC!. Rather
- * than introducing yet another lock, we can just use ordered workqueue
- * to make sure we're always sending a single preemption request with a
- * single workitem.
- */
- if (HAS_LOGICAL_RING_PREEMPTION(dev_priv) &&
- USES_GUC_SUBMISSION(dev_priv)) {
- guc->preempt_wq = alloc_ordered_workqueue("i915-guc_preempt",
- WQ_HIGHPRI);
- if (!guc->preempt_wq) {
- destroy_workqueue(guc->log.relay.flush_wq);
- DRM_ERROR("Couldn't allocate workqueue for GuC "
- "preemption\n");
- return -ENOMEM;
- }
- }
-
return 0;
}
@@ -129,10 +102,6 @@ static void guc_fini_wq(struct intel_guc *guc)
{
struct workqueue_struct *wq;
- wq = fetch_and_zero(&guc->preempt_wq);
- if (wq)
- destroy_workqueue(wq);
-
wq = fetch_and_zero(&guc->log.relay.flush_wq);
if (wq)
destroy_workqueue(wq);
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index 744220296653..b8c4615715c0 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -34,11 +34,6 @@
#include "intel_uc_fw.h"
#include "i915_vma.h"
-struct guc_preempt_work {
- struct work_struct work;
- struct intel_engine_cs *engine;
-};
-
/*
* Top level structure of GuC. It handles firmware loading and manages client
* pool and doorbells. intel_guc owns a intel_guc_client to replace the legacy
@@ -65,10 +60,6 @@ struct intel_guc {
void *shared_data_vaddr;
struct intel_guc_client *execbuf_client;
- struct intel_guc_client *preempt_client;
-
- struct guc_preempt_work preempt_work[I915_NUM_ENGINES];
- struct workqueue_struct *preempt_wq;
DECLARE_BITMAP(doorbell_bitmap, GUC_NUM_DOORBELLS);
/* Cyclic counter mod pagesize */
diff --git a/drivers/gpu/drm/i915/intel_guc_submission.c b/drivers/gpu/drm/i915/intel_guc_submission.c
index 8bc8aa54aa35..d5677dd8cc15 100644
--- a/drivers/gpu/drm/i915/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/intel_guc_submission.c
@@ -81,12 +81,6 @@
*
*/
-static inline u32 intel_hws_preempt_done_address(struct intel_engine_cs *engine)
-{
- return (i915_ggtt_offset(engine->status_page.vma) +
- I915_GEM_HWS_PREEMPT_ADDR);
-}
-
static inline struct i915_priolist *to_priolist(struct rb_node *rb)
{
return rb_entry(rb, struct i915_priolist, node);
@@ -558,125 +552,6 @@ static void flush_ggtt_writes(struct i915_vma *vma)
POSTING_READ_FW(GUC_STATUS);
}
-static void inject_preempt_context(struct work_struct *work)
-{
- struct guc_preempt_work *preempt_work =
- container_of(work, typeof(*preempt_work), work);
- struct intel_engine_cs *engine = preempt_work->engine;
- struct intel_guc *guc = container_of(preempt_work, typeof(*guc),
- preempt_work[engine->id]);
- struct intel_guc_client *client = guc->preempt_client;
- struct guc_stage_desc *stage_desc = __get_stage_desc(client);
- struct intel_context *ce = to_intel_context(client->owner, engine);
- u32 data[7];
-
- if (!ce->ring->emit) { /* recreate upon load/resume */
- u32 addr = intel_hws_preempt_done_address(engine);
- u32 *cs;
-
- cs = ce->ring->vaddr;
- if (engine->id == RCS) {
- cs = gen8_emit_ggtt_write_rcs(cs,
- GUC_PREEMPT_FINISHED,
- addr,
- PIPE_CONTROL_CS_STALL);
- } else {
- cs = gen8_emit_ggtt_write(cs,
- GUC_PREEMPT_FINISHED,
- addr);
- *cs++ = MI_NOOP;
- *cs++ = MI_NOOP;
- }
- *cs++ = MI_USER_INTERRUPT;
- *cs++ = MI_NOOP;
-
- ce->ring->emit = GUC_PREEMPT_BREADCRUMB_BYTES;
- GEM_BUG_ON((void *)cs - ce->ring->vaddr != ce->ring->emit);
-
- flush_ggtt_writes(ce->ring->vma);
- }
-
- spin_lock_irq(&client->wq_lock);
- guc_wq_item_append(client, engine->guc_id, lower_32_bits(ce->lrc_desc),
- GUC_PREEMPT_BREADCRUMB_BYTES / sizeof(u64), 0);
- spin_unlock_irq(&client->wq_lock);
-
- /*
- * If GuC firmware performs an engine reset while that engine had
- * a preemption pending, it will set the terminated attribute bit
- * on our preemption stage descriptor. GuC firmware retains all
- * pending work items for a high-priority GuC client, unlike the
- * normal-priority GuC client where work items are dropped. It
- * wants to make sure the preempt-to-idle work doesn't run when
- * scheduling resumes, and uses this bit to inform its scheduler
- * and presumably us as well. Our job is to clear it for the next
- * preemption after reset, otherwise that and future preemptions
- * will never complete. We'll just clear it every time.
- */
- stage_desc->attribute &= ~GUC_STAGE_DESC_ATTR_TERMINATED;
-
- data[0] = INTEL_GUC_ACTION_REQUEST_PREEMPTION;
- data[1] = client->stage_id;
- data[2] = INTEL_GUC_PREEMPT_OPTION_DROP_WORK_Q |
- INTEL_GUC_PREEMPT_OPTION_DROP_SUBMIT_Q;
- data[3] = engine->guc_id;
- data[4] = guc->execbuf_client->priority;
- data[5] = guc->execbuf_client->stage_id;
- data[6] = intel_guc_ggtt_offset(guc, guc->shared_data);
-
- if (WARN_ON(intel_guc_send(guc, data, ARRAY_SIZE(data)))) {
- execlists_clear_active(&engine->execlists,
- EXECLISTS_ACTIVE_PREEMPT);
- tasklet_schedule(&engine->execlists.tasklet);
- }
-
- (void)I915_SELFTEST_ONLY(engine->execlists.preempt_hang.count++);
-}
-
-/*
- * We're using user interrupt and HWSP value to mark that preemption has
- * finished and GPU is idle. Normally, we could unwind and continue similar to
- * execlists submission path. Unfortunately, with GuC we also need to wait for
- * it to finish its own postprocessing, before attempting to submit. Otherwise
- * GuC may silently ignore our submissions, and thus we risk losing request at
- * best, executing out-of-order and causing kernel panic at worst.
- */
-#define GUC_PREEMPT_POSTPROCESS_DELAY_MS 10
-static void wait_for_guc_preempt_report(struct intel_engine_cs *engine)
-{
- struct intel_guc *guc = &engine->i915->guc;
- struct guc_shared_ctx_data *data = guc->shared_data_vaddr;
- struct guc_ctx_report *report =
- &data->preempt_ctx_report[engine->guc_id];
-
- WARN_ON(wait_for_atomic(report->report_return_status ==
- INTEL_GUC_REPORT_STATUS_COMPLETE,
- GUC_PREEMPT_POSTPROCESS_DELAY_MS));
- /*
- * GuC is expecting that we're also going to clear the affected context
- * counter, let's also reset the return status to not depend on GuC
- * resetting it after recieving another preempt action
- */
- report->affected_count = 0;
- report->report_return_status = INTEL_GUC_REPORT_STATUS_UNKNOWN;
-}
-
-static void complete_preempt_context(struct intel_engine_cs *engine)
-{
- struct intel_engine_execlists *execlists = &engine->execlists;
-
- GEM_BUG_ON(!execlists_is_active(execlists, EXECLISTS_ACTIVE_PREEMPT));
-
- if (inject_preempt_hang(execlists))
- return;
-
- execlists_cancel_port_requests(execlists);
- execlists_unwind_incomplete_requests(execlists);
-
- wait_for_guc_preempt_report(engine);
- intel_write_status_page(engine, I915_GEM_HWS_PREEMPT, 0);
-}
-
/**
* guc_submit() - Submit commands through GuC
* @engine: engine associated with the commands
@@ -736,20 +611,6 @@ static bool __guc_dequeue(struct intel_engine_cs *engine)
lockdep_assert_held(&engine->timeline.lock);
if (port_isset(port)) {
- if (intel_engine_has_preemption(engine)) {
- struct guc_preempt_work *preempt_work =
- &engine->i915->guc.preempt_work[engine->id];
- int prio = execlists->queue_priority_hint;
-
- if (__execlists_need_preempt(prio, port_prio(port))) {
- execlists_set_active(execlists,
- EXECLISTS_ACTIVE_PREEMPT);
- queue_work(engine->i915->guc.preempt_wq,
- &preempt_work->work);
- return false;
- }
- }
-
port++;
if (port_isset(port))
return false;
@@ -832,13 +693,7 @@ static void guc_submission_tasklet(unsigned long data)
}
}
- if (execlists_is_active(execlists, EXECLISTS_ACTIVE_PREEMPT) &&
- intel_read_status_page(engine, I915_GEM_HWS_PREEMPT) ==
- GUC_PREEMPT_FINISHED)
- complete_preempt_context(engine);
-
- if (!execlists_is_active(execlists, EXECLISTS_ACTIVE_PREEMPT))
- guc_dequeue(engine);
+ guc_dequeue(engine);
spin_unlock_irqrestore(&engine->timeline.lock, flags);
}
@@ -859,16 +714,6 @@ static void guc_reset_prepare(struct intel_engine_cs *engine)
* prevents the race.
*/
__tasklet_disable_sync_once(&execlists->tasklet);
-
- /*
- * We're using worker to queue preemption requests from the tasklet in
- * GuC submission mode.
- * Even though tasklet was disabled, we may still have a worker queued.
- * Let's make sure that all workers scheduled before disabling the
- * tasklet are completed before continuing with the reset.
- */
- if (engine->i915->guc.preempt_wq)
- flush_workqueue(engine->i915->guc.preempt_wq);
}
/*
@@ -1028,7 +873,6 @@ static int guc_clients_create(struct intel_guc *guc)
struct intel_guc_client *client;
GEM_BUG_ON(guc->execbuf_client);
- GEM_BUG_ON(guc->preempt_client);
client = guc_client_alloc(dev_priv,
INTEL_INFO(dev_priv)->ring_mask,
@@ -1040,20 +884,6 @@ static int guc_clients_create(struct intel_guc *guc)
}
guc->execbuf_client = client;
- if (dev_priv->preempt_context) {
- client = guc_client_alloc(dev_priv,
- INTEL_INFO(dev_priv)->ring_mask,
- GUC_CLIENT_PRIORITY_KMD_HIGH,
- dev_priv->preempt_context);
- if (IS_ERR(client)) {
- DRM_ERROR("Failed to create GuC client for preemption!\n");
- guc_client_free(guc->execbuf_client);
- guc->execbuf_client = NULL;
- return PTR_ERR(client);
- }
- guc->preempt_client = client;
- }
-
return 0;
}
@@ -1061,10 +891,6 @@ static void guc_clients_destroy(struct intel_guc *guc)
{
struct intel_guc_client *client;
- client = fetch_and_zero(&guc->preempt_client);
- if (client)
- guc_client_free(client);
-
client = fetch_and_zero(&guc->execbuf_client);
if (client)
guc_client_free(client);
@@ -1113,22 +939,11 @@ static int guc_clients_enable(struct intel_guc *guc)
if (ret)
return ret;
- if (guc->preempt_client) {
- ret = __guc_client_enable(guc->preempt_client);
- if (ret) {
- __guc_client_disable(guc->execbuf_client);
- return ret;
- }
- }
-
return 0;
}
static void guc_clients_disable(struct intel_guc *guc)
{
- if (guc->preempt_client)
- __guc_client_disable(guc->preempt_client);
-
if (guc->execbuf_client)
__guc_client_disable(guc->execbuf_client);
}
@@ -1139,9 +954,6 @@ static void guc_clients_disable(struct intel_guc *guc)
*/
int intel_guc_submission_init(struct intel_guc *guc)
{
- struct drm_i915_private *dev_priv = guc_to_i915(guc);
- struct intel_engine_cs *engine;
- enum intel_engine_id id;
int ret;
if (guc->stage_desc_pool)
@@ -1161,11 +973,6 @@ int intel_guc_submission_init(struct intel_guc *guc)
if (ret)
goto err_pool;
- for_each_engine(engine, dev_priv, id) {
- guc->preempt_work[id].engine = engine;
- INIT_WORK(&guc->preempt_work[id].work, inject_preempt_context);
- }
-
return 0;
err_pool:
@@ -1175,13 +982,6 @@ int intel_guc_submission_init(struct intel_guc *guc)
void intel_guc_submission_fini(struct intel_guc *guc)
{
- struct drm_i915_private *dev_priv = guc_to_i915(guc);
- struct intel_engine_cs *engine;
- enum intel_engine_id id;
-
- for_each_engine(engine, dev_priv, id)
- cancel_work_sync(&guc->preempt_work[id].work);
-
guc_clients_destroy(guc);
WARN_ON(!guc_verify_doorbells(guc));
@@ -1292,6 +1092,7 @@ static void guc_set_default_submission(struct intel_engine_cs *engine)
engine->reset.prepare = guc_reset_prepare;
engine->flags &= ~I915_ENGINE_SUPPORTS_STATS;
+ engine->flags &= ~I915_ENGINE_HAS_PREEMPTION;
}
int intel_guc_submission_enable(struct intel_guc *guc)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 710ffb221775..9bd3f8aad6ac 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -724,8 +724,6 @@ intel_write_status_page(struct intel_engine_cs *engine, int reg, u32 value)
*/
#define I915_GEM_HWS_INDEX 0x30
#define I915_GEM_HWS_INDEX_ADDR (I915_GEM_HWS_INDEX * sizeof(u32))
-#define I915_GEM_HWS_PREEMPT 0x32
-#define I915_GEM_HWS_PREEMPT_ADDR (I915_GEM_HWS_PREEMPT * sizeof(u32))
#define I915_GEM_HWS_SEQNO 0x40
#define I915_GEM_HWS_SEQNO_ADDR (I915_GEM_HWS_SEQNO * sizeof(u32))
#define I915_GEM_HWS_SCRATCH 0x80
diff --git a/drivers/gpu/drm/i915/selftests/intel_guc.c b/drivers/gpu/drm/i915/selftests/intel_guc.c
index c5e0a0e98fcb..28ce5ce01043 100644
--- a/drivers/gpu/drm/i915/selftests/intel_guc.c
+++ b/drivers/gpu/drm/i915/selftests/intel_guc.c
@@ -162,7 +162,7 @@ static int igt_guc_clients(void *args)
*/
guc_clients_disable(guc);
guc_clients_destroy(guc);
- if (guc->execbuf_client || guc->preempt_client) {
+ if (guc->execbuf_client) {
pr_err("guc_clients_destroy lied!\n");
err = -EINVAL;
goto unlock;
@@ -182,18 +182,8 @@ static int igt_guc_clients(void *args)
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))) {
+ if (!has_doorbell(guc->execbuf_client)) {
pr_err("guc_clients_create didn't reserve doorbells\n");
err = -EINVAL;
goto out;
@@ -203,8 +193,7 @@ static int igt_guc_clients(void *args)
guc_clients_enable(guc);
/* each client should now have received a doorbell */
- if (!client_doorbell_in_sync(guc->execbuf_client) ||
- !client_doorbell_in_sync(guc->preempt_client)) {
+ if (!client_doorbell_in_sync(guc->execbuf_client)) {
pr_err("failed to initialize the doorbells\n");
err = -EINVAL;
goto out;
diff --git a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
index 74e743b101d9..28af146f28f3 100644
--- a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
+++ b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
@@ -1580,9 +1580,6 @@ static int igt_atomic_reset(void *arg)
/* Check that the resets are usable from atomic context */
- if (USES_GUC_SUBMISSION(i915))
- return 0; /* guc is dead; long live the guc */
-
igt_global_reset_lock(i915);
mutex_lock(&i915->drm.struct_mutex);
wakeref = intel_runtime_pm_get(i915);
