On 06/05/2021 20:14, Matthew Brost wrote:
When running the GuC the GPU can't be considered idle if the GuC still
has contexts pinned. As such, a call has been added in
intel_gt_wait_for_idle to idle the UC and in turn the GuC by waiting for
the number of unpinned contexts to go to zero.
Cc: John Harrison <john.c.harrison@xxxxxxxxx>
Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
---
drivers/gpu/drm/i915/gem/i915_gem_mman.c | 3 +-
drivers/gpu/drm/i915/gt/intel_gt.c | 18 ++++
drivers/gpu/drm/i915/gt/intel_gt.h | 2 +
drivers/gpu/drm/i915/gt/intel_gt_requests.c | 22 ++---
drivers/gpu/drm/i915/gt/intel_gt_requests.h | 7 +-
drivers/gpu/drm/i915/gt/uc/intel_guc.h | 4 +
drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c | 1 +
drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h | 4 +
.../gpu/drm/i915/gt/uc/intel_guc_submission.c | 91 ++++++++++++++++++-
drivers/gpu/drm/i915/gt/uc/intel_uc.h | 5 +
drivers/gpu/drm/i915/i915_debugfs.c | 1 +
drivers/gpu/drm/i915/i915_gem_evict.c | 1 +
.../gpu/drm/i915/selftests/igt_live_test.c | 2 +-
.../gpu/drm/i915/selftests/mock_gem_device.c | 3 +-
14 files changed, 137 insertions(+), 27 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
index 8598a1c78a4c..2f5295c9408d 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
@@ -634,7 +634,8 @@ mmap_offset_attach(struct drm_i915_gem_object *obj,
goto insert;
/* Attempt to reap some mmap space from dead objects */
- err = intel_gt_retire_requests_timeout(&i915->gt, MAX_SCHEDULE_TIMEOUT);
+ err = intel_gt_retire_requests_timeout(&i915->gt, MAX_SCHEDULE_TIMEOUT,
+ NULL);
if (err)
goto err;
diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index 8d77dcbad059..1742a8561f69 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -574,6 +574,24 @@ static void __intel_gt_disable(struct intel_gt *gt)
GEM_BUG_ON(intel_gt_pm_is_awake(gt));
}
+int intel_gt_wait_for_idle(struct intel_gt *gt, long timeout)
+{
+ long rtimeout;
+
+ /* If the device is asleep, we have no requests outstanding */
+ if (!intel_gt_pm_is_awake(gt))
+ return 0;
+
+ while ((timeout = intel_gt_retire_requests_timeout(gt, timeout,
+ &rtimeout)) > 0) {
+ cond_resched();
+ if (signal_pending(current))
+ return -EINTR;
+ }
+
+ return timeout ? timeout : intel_uc_wait_for_idle(>->uc, rtimeout);
+}
+
int intel_gt_init(struct intel_gt *gt)
{
int err;
diff --git a/drivers/gpu/drm/i915/gt/intel_gt.h b/drivers/gpu/drm/i915/gt/intel_gt.h
index 7ec395cace69..c775043334bf 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt.h
@@ -48,6 +48,8 @@ void intel_gt_driver_release(struct intel_gt *gt);
void intel_gt_driver_late_release(struct intel_gt *gt);
+int intel_gt_wait_for_idle(struct intel_gt *gt, long timeout);
+
void intel_gt_check_and_clear_faults(struct intel_gt *gt);
void intel_gt_clear_error_registers(struct intel_gt *gt,
intel_engine_mask_t engine_mask);
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_requests.c b/drivers/gpu/drm/i915/gt/intel_gt_requests.c
index 647eca9d867a..c6c702f236fa 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_requests.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_requests.c
@@ -13,6 +13,7 @@
#include "intel_gt_pm.h"
#include "intel_gt_requests.h"
#include "intel_timeline.h"
+#include "uc/intel_uc.h"
static bool retire_requests(struct intel_timeline *tl)
{
@@ -130,7 +131,8 @@ void intel_engine_fini_retire(struct intel_engine_cs *engine)
GEM_BUG_ON(engine->retire);
}
-long intel_gt_retire_requests_timeout(struct intel_gt *gt, long timeout)
+long intel_gt_retire_requests_timeout(struct intel_gt *gt, long timeout,
+ long *rtimeout)
What is 'rtimeout', I know remaining, but it can be more
self-descriptive to start with.
It feels a bit churny for what it is. How plausible would be
alternatives to either change existing timeout to in/out, or measure
sleep internally in this function, or just risk sleeping twice as long
by passing the original timeout to uc idle as well?
{
struct intel_gt_timelines *timelines = >->timelines;
struct intel_timeline *tl, *tn;
@@ -195,22 +197,10 @@ out_active: spin_lock(&timelines->lock);
if (flush_submission(gt, timeout)) /* Wait, there's more! */
active_count++;
- return active_count ? timeout : 0;
-}
-
-int intel_gt_wait_for_idle(struct intel_gt *gt, long timeout)
-{
- /* If the device is asleep, we have no requests outstanding */
- if (!intel_gt_pm_is_awake(gt))
- return 0;
-
- while ((timeout = intel_gt_retire_requests_timeout(gt, timeout)) > 0) {
- cond_resched();
- if (signal_pending(current))
- return -EINTR;
- }
+ if (rtimeout)
+ *rtimeout = timeout;
- return timeout;
+ return active_count ? timeout : 0;
}
static void retire_work_handler(struct work_struct *work)
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_requests.h b/drivers/gpu/drm/i915/gt/intel_gt_requests.h
index fcc30a6e4fe9..4419787124e2 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_requests.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_requests.h
@@ -10,10 +10,11 @@ struct intel_engine_cs;
struct intel_gt;
struct intel_timeline;
-long intel_gt_retire_requests_timeout(struct intel_gt *gt, long timeout);
+long intel_gt_retire_requests_timeout(struct intel_gt *gt, long timeout,
+ long *rtimeout);
static inline void intel_gt_retire_requests(struct intel_gt *gt)
{
- intel_gt_retire_requests_timeout(gt, 0);
+ intel_gt_retire_requests_timeout(gt, 0, NULL);
}
void intel_engine_init_retire(struct intel_engine_cs *engine);
@@ -21,8 +22,6 @@ void intel_engine_add_retire(struct intel_engine_cs *engine,
struct intel_timeline *tl);
void intel_engine_fini_retire(struct intel_engine_cs *engine);
-int intel_gt_wait_for_idle(struct intel_gt *gt, long timeout);
-
void intel_gt_init_requests(struct intel_gt *gt);
void intel_gt_park_requests(struct intel_gt *gt);
void intel_gt_unpark_requests(struct intel_gt *gt);
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
index 485e98f3f304..47eaa69809e8 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
@@ -38,6 +38,8 @@ struct intel_guc {
spinlock_t irq_lock;
unsigned int msg_enabled_mask;
+ atomic_t outstanding_submission_g2h;
+
struct {
bool enabled;
void (*reset)(struct intel_guc *guc);
@@ -239,6 +241,8 @@ static inline void intel_guc_disable_msg(struct intel_guc *guc, u32 mask)
spin_unlock_irq(&guc->irq_lock);
}
+int intel_guc_wait_for_idle(struct intel_guc *guc, long timeout);
+
int intel_guc_reset_engine(struct intel_guc *guc,
struct intel_engine_cs *engine);
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
index f1893030ca88..cf701056fa14 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
@@ -111,6 +111,7 @@ void intel_guc_ct_init_early(struct intel_guc_ct *ct)
INIT_LIST_HEAD(&ct->requests.incoming);
INIT_WORK(&ct->requests.worker, ct_incoming_request_worker_func);
tasklet_init(&ct->receive_tasklet, ct_receive_tasklet_func, (unsigned long)ct);
+ init_waitqueue_head(&ct->wq);
}
static inline const char *guc_ct_buffer_type_to_str(u32 type)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h
index 660bf37238e2..ab1b79ab960b 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h
@@ -10,6 +10,7 @@
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/ktime.h>
+#include <linux/wait.h>
#include "intel_guc_fwif.h"
@@ -68,6 +69,9 @@ struct intel_guc_ct {
struct tasklet_struct receive_tasklet;
+ /** @wq: wait queue for g2h chanenl */
+ wait_queue_head_t wq;
+
struct {
u16 last_fence; /* last fence used to send request */
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index ae0b386467e3..0ff7dd6d337d 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -253,6 +253,74 @@ static inline void set_lrc_desc_registered(struct intel_guc *guc, u32 id,
xa_store_irq(&guc->context_lookup, id, ce, GFP_ATOMIC);
}
+static int guc_submission_busy_loop(struct intel_guc* guc,
+ const u32 *action,
+ u32 len,
+ u32 g2h_len_dw,
+ bool loop)
+{
+ int err;
+
+ err = intel_guc_send_busy_loop(guc, action, len, g2h_len_dw, loop);
+
+ if (!err && g2h_len_dw)
+ atomic_inc(&guc->outstanding_submission_g2h);
+
+ return err;
+}
+
+static int guc_wait_for_pending_msg(struct intel_guc *guc,
+ atomic_t *wait_var,
+ bool interruptible,
+ long timeout)
+{
+ const int state = interruptible ?
+ TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE;
+ DEFINE_WAIT(wait);
+
+ might_sleep();
+ GEM_BUG_ON(timeout < 0);
+
+ if (!atomic_read(wait_var))
+ return 0;
+
+ if (!timeout)
+ return -ETIME;
+
+ for (;;) {
+ prepare_to_wait(&guc->ct.wq, &wait, state);
+
+ if (!atomic_read(wait_var))
+ break;
+
+ if (signal_pending_state(state, current)) {
+ timeout = -ERESTARTSYS;
+ break;
+ }
+
+ if (!timeout) {
+ timeout = -ETIME;
+ break;
+ }
+
+ timeout = io_schedule_timeout(timeout);
+ }
+ finish_wait(&guc->ct.wq, &wait);
+
+ return (timeout < 0) ? timeout : 0;
+}
See if it is possible to simplify all this with wait_var_event and
wake_up_var.
+
+int intel_guc_wait_for_idle(struct intel_guc *guc, long timeout)
+{
+ bool interruptible = true;
+
+ if (unlikely(timeout < 0))
+ timeout = -timeout, interruptible = false;
+
+ return guc_wait_for_pending_msg(guc, &guc->outstanding_submission_g2h,
+ interruptible, timeout);
+}
+
static int guc_add_request(struct intel_guc *guc, struct i915_request *rq)
{
int err;
@@ -279,6 +347,7 @@ static int guc_add_request(struct intel_guc *guc, struct i915_request *rq)
err = intel_guc_send_nb(guc, action, len, g2h_len_dw);
if (!enabled && !err) {
+ atomic_inc(&guc->outstanding_submission_g2h);
set_context_enabled(ce);
} else if (!enabled) {
clr_context_pending_enable(ce);
@@ -734,7 +803,7 @@ static int __guc_action_register_context(struct intel_guc *guc,
offset,
};
- return intel_guc_send_busy_loop(guc, action, ARRAY_SIZE(action), 0, true);
+ return guc_submission_busy_loop(guc, action, ARRAY_SIZE(action), 0, true);
}
static int register_context(struct intel_context *ce)
@@ -754,7 +823,7 @@ static int __guc_action_deregister_context(struct intel_guc *guc,
guc_id,
};
- return intel_guc_send_busy_loop(guc, action, ARRAY_SIZE(action),
+ return guc_submission_busy_loop(guc, action, ARRAY_SIZE(action),
G2H_LEN_DW_DEREGISTER_CONTEXT, true);
}
@@ -871,7 +940,9 @@ static int guc_context_pin(struct intel_context *ce, void *vaddr)
static void guc_context_unpin(struct intel_context *ce)
{
- unpin_guc_id(ce_to_guc(ce), ce);
+ struct intel_guc *guc = ce_to_guc(ce);
+
+ unpin_guc_id(guc, ce);
lrc_unpin(ce);
}
@@ -894,7 +965,7 @@ static void __guc_context_sched_disable(struct intel_guc *guc,
intel_context_get(ce);
- intel_guc_send_busy_loop(guc, action, ARRAY_SIZE(action),
+ guc_submission_busy_loop(guc, action, ARRAY_SIZE(action),
G2H_LEN_DW_SCHED_CONTEXT_MODE_SET, true);
}
@@ -1437,6 +1508,15 @@ g2h_context_lookup(struct intel_guc *guc, u32 desc_idx)
return ce;
}
+static void decr_outstanding_submission_g2h(struct intel_guc *guc)
+{
+ if (atomic_dec_and_test(&guc->outstanding_submission_g2h)) {
+ smp_mb();
+ if (waitqueue_active(&guc->ct.wq))
+ wake_up_all(&guc->ct.wq);
I keep pointing out this pattern is racy and at least needs comment why
it is safe.
Regards,
Tvrtko
+ }
+}
+
int intel_guc_deregister_done_process_msg(struct intel_guc *guc,
const u32 *msg,
u32 len)
@@ -1472,6 +1552,8 @@ int intel_guc_deregister_done_process_msg(struct intel_guc *guc,
lrc_destroy(&ce->ref);
}
+ decr_outstanding_submission_g2h(guc);
+
return 0;
}
@@ -1520,6 +1602,7 @@ int intel_guc_sched_done_process_msg(struct intel_guc *guc,
spin_unlock_irqrestore(&ce->guc_state.lock, flags);
}
+ decr_outstanding_submission_g2h(guc);
intel_context_put(ce);
return 0;
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc.h b/drivers/gpu/drm/i915/gt/uc/intel_uc.h
index 9c954c589edf..c4cef885e984 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.h
@@ -81,6 +81,11 @@ uc_state_checkers(guc, guc_submission);
#undef uc_state_checkers
#undef __uc_state_checker
+static inline int intel_uc_wait_for_idle(struct intel_uc *uc, long timeout)
+{
+ return intel_guc_wait_for_idle(&uc->guc, timeout);
+}
+
#define intel_uc_ops_function(_NAME, _OPS, _TYPE, _RET) \
static inline _TYPE intel_uc_##_NAME(struct intel_uc *uc) \
{ \
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 8dd374691102..bb29838d1cd7 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -36,6 +36,7 @@
#include "gt/intel_gt_clock_utils.h"
#include "gt/intel_gt.h"
#include "gt/intel_gt_pm.h"
+#include "gt/intel_gt.h"
#include "gt/intel_gt_requests.h"
#include "gt/intel_reset.h"
#include "gt/intel_rc6.h"
diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c
index 4d2d59a9942b..2b73ddb11c66 100644
--- a/drivers/gpu/drm/i915/i915_gem_evict.c
+++ b/drivers/gpu/drm/i915/i915_gem_evict.c
@@ -27,6 +27,7 @@
*/
#include "gem/i915_gem_context.h"
+#include "gt/intel_gt.h"
#include "gt/intel_gt_requests.h"
#include "i915_drv.h"
diff --git a/drivers/gpu/drm/i915/selftests/igt_live_test.c b/drivers/gpu/drm/i915/selftests/igt_live_test.c
index c130010a7033..1c721542e277 100644
--- a/drivers/gpu/drm/i915/selftests/igt_live_test.c
+++ b/drivers/gpu/drm/i915/selftests/igt_live_test.c
@@ -5,7 +5,7 @@
*/
#include "i915_drv.h"
-#include "gt/intel_gt_requests.h"
+#include "gt/intel_gt.h"
#include "../i915_selftest.h"
#include "igt_flush_test.h"
diff --git a/drivers/gpu/drm/i915/selftests/mock_gem_device.c b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
index cf40004bc92a..6c06816e2b99 100644
--- a/drivers/gpu/drm/i915/selftests/mock_gem_device.c
+++ b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
@@ -51,7 +51,8 @@ void mock_device_flush(struct drm_i915_private *i915)
do {
for_each_engine(engine, gt, id)
mock_engine_flush(engine);
- } while (intel_gt_retire_requests_timeout(gt, MAX_SCHEDULE_TIMEOUT));
+ } while (intel_gt_retire_requests_timeout(gt, MAX_SCHEDULE_TIMEOUT,
+ NULL));
}
static void mock_device_release(struct drm_device *dev)
