[Intel-gfx] [PATCH 04/27] drm/i915/guc: Take GT PM ref when deregistering context

Matthew Brost
2021-08-20T22:50:39Z

Taking a PM reference to prevent intel_gt_wait_for_idle from short
circuiting while a deregister context H2G is in flight.

FIXME: Move locking / structure changes into different patch

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
---
drivers/gpu/drm/i915/gt/intel_context.c | 2 +
drivers/gpu/drm/i915/gt/intel_context_types.h | 13 +-
drivers/gpu/drm/i915/gt/intel_engine_pm.h | 5 +
drivers/gpu/drm/i915/gt/intel_gt_pm.h | 13 ++
.../gpu/drm/i915/gt/uc/abi/guc_actions_abi.h | 1 +
drivers/gpu/drm/i915/gt/uc/intel_guc.h | 46 ++--
.../gpu/drm/i915/gt/uc/intel_guc_debugfs.c | 13 +-
.../gpu/drm/i915/gt/uc/intel_guc_submission.c | 212 +++++++++++-------
8 files changed, 199 insertions(+), 106 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_context.c b/drivers/gpu/drm/i915/gt/intel_context.c
index adfe49b53b1b..c8595da64ad8 100644
--- a/drivers/gpu/drm/i915/gt/intel_context.c
+++ b/drivers/gpu/drm/i915/gt/intel_context.c
@@ -399,6 +399,8 @@ intel_context_init(struct intel_context *ce, struct intel_engine_cs *engine)
ce->guc_id.id = GUC_INVALID_LRC_ID;
INIT_LIST_HEAD(&ce->guc_id.link);

+ INIT_LIST_HEAD(&ce->destroyed_link);
+
/*
* Initialize fence to be complete as this is expected to be complete
* unless there is a pending schedule disable outstanding.
diff --git a/drivers/gpu/drm/i915/gt/intel_context_types.h b/drivers/gpu/drm/i915/gt/intel_context_types.h
index 80bbdc7810f6..fd338a30617e 100644
--- a/drivers/gpu/drm/i915/gt/intel_context_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_context_types.h
@@ -190,22 +190,29 @@ struct intel_context {
/**
* @id: unique handle which is used to communicate information
* with the GuC about this context, protected by
- * guc->contexts_lock
+ * guc->submission_state.lock
*/
u16 id;
/**
* @ref: the number of references to the guc_id, when
* transitioning in and out of zero protected by
- * guc->contexts_lock
+ * guc->submission_state.lock
*/
atomic_t ref;
/**
* @link: in guc->guc_id_list when the guc_id has no refs but is
- * still valid, protected by guc->contexts_lock
+ * still valid, protected by guc->submission_state.lock
*/
struct list_head link;
} guc_id;

+ /**
+ * @destroyed_link: link in guc->submission_state.destroyed_contexts, in
+ * list when context is pending to be destroyed (deregistered with the
+ * GuC), protected by guc->submission_state.lock
+ */
+ struct list_head destroyed_link;
+
#ifdef CONFIG_DRM_I915_SELFTEST
/**
* @drop_schedule_enable: Force drop of schedule enable G2H for selftest
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_pm.h b/drivers/gpu/drm/i915/gt/intel_engine_pm.h
index 70ea46d6cfb0..17a5028ea177 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_pm.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_pm.h
@@ -16,6 +16,11 @@ intel_engine_pm_is_awake(const struct intel_engine_cs *engine)
return intel_wakeref_is_active(&engine->wakeref);
}

+static inline void __intel_engine_pm_get(struct intel_engine_cs *engine)
+{
+ __intel_wakeref_get(&engine->wakeref);
+}
+
static inline void intel_engine_pm_get(struct intel_engine_cs *engine)
{
intel_wakeref_get(&engine->wakeref);
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.h b/drivers/gpu/drm/i915/gt/intel_gt_pm.h
index d0588d8aaa44..a17bf0d4592b 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.h
@@ -41,6 +41,19 @@ static inline void intel_gt_pm_put_async(struct intel_gt *gt)
intel_wakeref_put_async(&gt->wakeref);
}

+#define with_intel_gt_pm(gt, tmp) \
+ for (tmp = 1, intel_gt_pm_get(gt); tmp; \
+ intel_gt_pm_put(gt), tmp = 0)
+#define with_intel_gt_pm_async(gt, tmp) \
+ for (tmp = 1, intel_gt_pm_get(gt); tmp; \
+ intel_gt_pm_put_async(gt), tmp = 0)
+#define with_intel_gt_pm_if_awake(gt, tmp) \
+ for (tmp = intel_gt_pm_get_if_awake(gt); tmp; \
+ intel_gt_pm_put(gt), tmp = 0)
+#define with_intel_gt_pm_if_awake_async(gt, tmp) \
+ for (tmp = intel_gt_pm_get_if_awake(gt); tmp; \
+ intel_gt_pm_put_async(gt), tmp = 0)
+
static inline int intel_gt_pm_wait_for_idle(struct intel_gt *gt)
{
return intel_wakeref_wait_for_idle(&gt->wakeref);
diff --git a/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h b/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h
index 8ff582222aff..ba10bd374cee 100644
--- a/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h
+++ b/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h
@@ -142,6 +142,7 @@ enum intel_guc_action {
INTEL_GUC_ACTION_REGISTER_COMMAND_TRANSPORT_BUFFER = 0x4505,
INTEL_GUC_ACTION_DEREGISTER_COMMAND_TRANSPORT_BUFFER = 0x4506,
INTEL_GUC_ACTION_DEREGISTER_CONTEXT_DONE = 0x4600,
+ INTEL_GUC_ACTION_REGISTER_CONTEXT_MULTI_LRC = 0x4601,
INTEL_GUC_ACTION_RESET_CLIENT = 0x5507,
INTEL_GUC_ACTION_LIMIT
};
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
index 6fd2719d1b75..7358883f1540 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
@@ -53,21 +53,37 @@ struct intel_guc {
void (*disable)(struct intel_guc *guc);
} interrupts;

- /**
- * @contexts_lock: protects guc_ids, guc_id_list, ce->guc_id.id, and
- * ce->guc_id.ref when transitioning in and out of zero
- */
- spinlock_t contexts_lock;
- /** @guc_ids: used to allocate new guc_ids */
- struct ida guc_ids;
- /** @num_guc_ids: number of guc_ids that can be used */
- u32 num_guc_ids;
- /** @max_guc_ids: max number of guc_ids that can be used */
- u32 max_guc_ids;
- /**
- * @guc_id_list: list of intel_context with valid guc_ids but no refs
- */
- struct list_head guc_id_list;
+ struct {
+ /**
+ * @lock: protects everything in submission_state, ce->guc_id,
+ * and ce->destroyed_link
+ */
+ spinlock_t lock;
+ /**
+ * @guc_ids: used to allocate new guc_ids
+ */
+ struct ida guc_ids;
+ /** @num_guc_ids: number of guc_ids that can be used */
+ u32 num_guc_ids;
+ /** @max_guc_ids: max number of guc_ids that can be used */
+ u32 max_guc_ids;
+ /**
+ * @guc_id_list: list of intel_context with valid guc_ids but no
+ * refs
+ */
+ struct list_head guc_id_list;
+ /**
+ * @destroyed_contexts: list of contexts waiting to be destroyed
+ * (deregistered with the GuC)
+ */
+ struct list_head destroyed_contexts;
+ /**
+ * @destroyed_worker: worker to deregister contexts, need as we
+ * need to take a GT PM reference and can't from destroy
+ * function as it might be in an atomic context (no sleeping)
+ */
+ struct work_struct destroyed_worker;
+ } submission_state;

bool submission_supported;
bool submission_selected;
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_debugfs.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_debugfs.c
index b88d343ee432..27655460ee84 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_debugfs.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_debugfs.c
@@ -78,7 +78,7 @@ static int guc_num_id_get(void *data, u64 *val)
if (!intel_guc_submission_is_used(guc))
return -ENODEV;

- *val = guc->num_guc_ids;
+ *val = guc->submission_state.num_guc_ids;

return 0;
}
@@ -86,16 +86,21 @@ static int guc_num_id_get(void *data, u64 *val)
static int guc_num_id_set(void *data, u64 val)
{
struct intel_guc *guc = data;
+ unsigned long flags;

if (!intel_guc_submission_is_used(guc))
return -ENODEV;

- if (val > guc->max_guc_ids)
- val = guc->max_guc_ids;
+ spin_lock_irqsave(&guc->submission_state.lock, flags);
+
+ if (val > guc->submission_state.max_guc_ids)
+ val = guc->submission_state.max_guc_ids;
else if (val < 256)
val = 256;

- guc->num_guc_ids = val;
+ guc->submission_state.num_guc_ids = val;
+
+ spin_unlock_irqrestore(&guc->submission_state.lock, flags);

return 0;
}
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 68742b612692..f835e06e5f9f 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -86,9 +86,9 @@
* submitting at a time. Currently only 1 sched_engine used for all of GuC
* submission but that could change in the future.
*
- * guc->contexts_lock
- * Protects guc_id allocation. Global lock i.e. Only 1 context that uses GuC
- * submission can hold this at a time.
+ * guc->submission_state.lock
+ * Global lock for GuC submission state. Protects guc_ids and destroyed contexts
+ * list.
*
* ce->guc_state.lock
* Protects everything under ce->guc_state. Ensures that a context is in the
@@ -100,7 +100,7 @@
*
* Lock ordering rules:
* sched_engine->lock -> ce->guc_state.lock
- * guc->contexts_lock -> ce->guc_state.lock
+ * guc->submission_state.lock -> ce->guc_state.lock
*
* Reset races:
* When a GPU full reset is triggered it is assumed that some G2H responses to
@@ -344,7 +344,7 @@ static struct guc_lrc_desc *__get_lrc_desc(struct intel_guc *guc, u32 index)
{
struct guc_lrc_desc *base = guc->lrc_desc_pool_vaddr;

- GEM_BUG_ON(index >= guc->max_guc_ids);
+ GEM_BUG_ON(index >= guc->submission_state.max_guc_ids);

return &base[index];
}
@@ -353,7 +353,7 @@ static struct intel_context *__get_context(struct intel_guc *guc, u32 id)
{
struct intel_context *ce = xa_load(&guc->context_lookup, id);

- GEM_BUG_ON(id >= guc->max_guc_ids);
+ GEM_BUG_ON(id >= guc->submission_state.max_guc_ids);

return ce;
}
@@ -363,7 +363,8 @@ static int guc_lrc_desc_pool_create(struct intel_guc *guc)
u32 size;
int ret;

- size = PAGE_ALIGN(sizeof(struct guc_lrc_desc) * guc->max_guc_ids);
+ size = PAGE_ALIGN(sizeof(struct guc_lrc_desc) *
+ guc->submission_state.max_guc_ids);
ret = intel_guc_allocate_and_map_vma(guc, size, &guc->lrc_desc_pool,
(void **)&guc->lrc_desc_pool_vaddr);
if (ret)
@@ -711,6 +712,7 @@ static void scrub_guc_desc_for_outstanding_g2h(struct intel_guc *guc)
if (deregister)
guc_signal_context_fence(ce);
if (destroyed) {
+ intel_gt_pm_put_async(guc_to_gt(guc));
release_guc_id(guc, ce);
__guc_context_destroy(ce);
}
@@ -789,6 +791,8 @@ static void guc_flush_submissions(struct intel_guc *guc)
spin_unlock_irqrestore(&sched_engine->lock, flags);
}

+static void guc_flush_destroyed_contexts(struct intel_guc *guc);
+
void intel_guc_submission_reset_prepare(struct intel_guc *guc)
{
if (unlikely(!guc_submission_initialized(guc))) {
@@ -805,6 +809,7 @@ void intel_guc_submission_reset_prepare(struct intel_guc *guc)
spin_unlock_irq(&guc_to_gt(guc)->irq_lock);

flush_work(&guc->ct.requests.worker);
+ guc_flush_destroyed_contexts(guc);

scrub_guc_desc_for_outstanding_g2h(guc);
}
@@ -1102,6 +1107,8 @@ void intel_guc_submission_reset_finish(struct intel_guc *guc)
intel_gt_unpark_heartbeats(guc_to_gt(guc));
}

+static void destroyed_worker_func(struct work_struct *w);
+
/*
* Set up the memory resources to be shared with the GuC (via the GGTT)
* at firmware loading time.
@@ -1124,9 +1131,11 @@ int intel_guc_submission_init(struct intel_guc *guc)

xa_init_flags(&guc->context_lookup, XA_FLAGS_LOCK_IRQ);

- spin_lock_init(&guc->contexts_lock);
- INIT_LIST_HEAD(&guc->guc_id_list);
- ida_init(&guc->guc_ids);
+ spin_lock_init(&guc->submission_state.lock);
+ INIT_LIST_HEAD(&guc->submission_state.guc_id_list);
+ ida_init(&guc->submission_state.guc_ids);
+ INIT_LIST_HEAD(&guc->submission_state.destroyed_contexts);
+ INIT_WORK(&guc->submission_state.destroyed_worker, destroyed_worker_func);

return 0;
}
@@ -1137,6 +1146,7 @@ void intel_guc_submission_fini(struct intel_guc *guc)
return;

guc_lrc_desc_pool_destroy(guc);
+ guc_flush_destroyed_contexts(guc);
i915_sched_engine_put(guc->sched_engine);
}

@@ -1191,15 +1201,16 @@ static void guc_submit_request(struct i915_request *rq)

static int new_guc_id(struct intel_guc *guc)
{
- return ida_simple_get(&guc->guc_ids, 0,
- guc->num_guc_ids, GFP_KERNEL |
+ return ida_simple_get(&guc->submission_state.guc_ids, 0,
+ guc->submission_state.num_guc_ids, GFP_KERNEL |
__GFP_RETRY_MAYFAIL | __GFP_NOWARN);
}

static void __release_guc_id(struct intel_guc *guc, struct intel_context *ce)
{
if (!context_guc_id_invalid(ce)) {
- ida_simple_remove(&guc->guc_ids, ce->guc_id.id);
+ ida_simple_remove(&guc->submission_state.guc_ids,
+ ce->guc_id.id);
reset_lrc_desc(guc, ce->guc_id.id);
set_context_guc_id_invalid(ce);
}
@@ -1211,9 +1222,9 @@ static void release_guc_id(struct intel_guc *guc, struct intel_context *ce)
{
unsigned long flags;

- spin_lock_irqsave(&guc->contexts_lock, flags);
+ spin_lock_irqsave(&guc->submission_state.lock, flags);
__release_guc_id(guc, ce);
- spin_unlock_irqrestore(&guc->contexts_lock, flags);
+ spin_unlock_irqrestore(&guc->submission_state.lock, flags);
}

static int steal_guc_id(struct intel_guc *guc)
@@ -1221,10 +1232,10 @@ static int steal_guc_id(struct intel_guc *guc)
struct intel_context *ce;
int guc_id;

- lockdep_assert_held(&guc->contexts_lock);
+ lockdep_assert_held(&guc->submission_state.lock);

- if (!list_empty(&guc->guc_id_list)) {
- ce = list_first_entry(&guc->guc_id_list,
+ if (!list_empty(&guc->submission_state.guc_id_list)) {
+ ce = list_first_entry(&guc->submission_state.guc_id_list,
struct intel_context,
guc_id.link);

@@ -1249,7 +1260,7 @@ static int assign_guc_id(struct intel_guc *guc, u16 *out)
{
int ret;

- lockdep_assert_held(&guc->contexts_lock);
+ lockdep_assert_held(&guc->submission_state.lock);

ret = new_guc_id(guc);
if (unlikely(ret < 0)) {
@@ -1271,7 +1282,7 @@ static int pin_guc_id(struct intel_guc *guc, struct intel_context *ce)
GEM_BUG_ON(atomic_read(&ce->guc_id.ref));

try_again:
- spin_lock_irqsave(&guc->contexts_lock, flags);
+ spin_lock_irqsave(&guc->submission_state.lock, flags);

might_lock(&ce->guc_state.lock);

@@ -1286,7 +1297,7 @@ static int pin_guc_id(struct intel_guc *guc, struct intel_context *ce)
atomic_inc(&ce->guc_id.ref);

out_unlock:
- spin_unlock_irqrestore(&guc->contexts_lock, flags);
+ spin_unlock_irqrestore(&guc->submission_state.lock, flags);

/*
* -EAGAIN indicates no guc_id are available, let's retire any
@@ -1322,11 +1333,12 @@ static void unpin_guc_id(struct intel_guc *guc, struct intel_context *ce)
if (unlikely(context_guc_id_invalid(ce)))
return;

- spin_lock_irqsave(&guc->contexts_lock, flags);
+ spin_lock_irqsave(&guc->submission_state.lock, flags);
if (!context_guc_id_invalid(ce) && list_empty(&ce->guc_id.link) &&
!atomic_read(&ce->guc_id.ref))
- list_add_tail(&ce->guc_id.link, &guc->guc_id_list);
- spin_unlock_irqrestore(&guc->contexts_lock, flags);
+ list_add_tail(&ce->guc_id.link,
+ &guc->submission_state.guc_id_list);
+ spin_unlock_irqrestore(&guc->submission_state.lock, flags);
}

static int __guc_action_register_context(struct intel_guc *guc,
@@ -1841,11 +1853,30 @@ static void guc_context_sched_disable(struct intel_context *ce)
static void guc_lrc_desc_unpin(struct intel_context *ce)
{
struct intel_guc *guc = ce_to_guc(ce);
+ struct intel_gt *gt = guc_to_gt(guc);
+ unsigned long flags;
+ bool disabled;

+ GEM_BUG_ON(!intel_gt_pm_is_awake(gt));
GEM_BUG_ON(!lrc_desc_registered(guc, ce->guc_id.id));
GEM_BUG_ON(ce != __get_context(guc, ce->guc_id.id));
GEM_BUG_ON(context_enabled(ce));

+ /* Seal race with Reset */
+ spin_lock_irqsave(&ce->guc_state.lock, flags);
+ disabled = submission_disabled(guc);
+ if (likely(!disabled)) {
+ __intel_gt_pm_get(gt);
+ set_context_destroyed(ce);
+ clr_context_registered(ce);
+ }
+ spin_unlock_irqrestore(&ce->guc_state.lock, flags);
+ if (unlikely(disabled)) {
+ release_guc_id(guc, ce);
+ __guc_context_destroy(ce);
+ return;
+ }
+
deregister_context(ce, ce->guc_id.id, true);
}

@@ -1873,78 +1904,88 @@ static void __guc_context_destroy(struct intel_context *ce)
}
}

+static void guc_flush_destroyed_contexts(struct intel_guc *guc)
+{
+ struct intel_context *ce, *cn;
+ unsigned long flags;
+
+ GEM_BUG_ON(!submission_disabled(guc) &&
+ guc_submission_initialized(guc));
+
+ spin_lock_irqsave(&guc->submission_state.lock, flags);
+ list_for_each_entry_safe(ce, cn,
+ &guc->submission_state.destroyed_contexts,
+ destroyed_link) {
+ list_del_init(&ce->destroyed_link);
+ __release_guc_id(guc, ce);
+ __guc_context_destroy(ce);
+ }
+ spin_unlock_irqrestore(&guc->submission_state.lock, flags);
+}
+
+static void deregister_destroyed_contexts(struct intel_guc *guc)
+{
+ struct intel_context *ce, *cn;
+ unsigned long flags;
+
+ spin_lock_irqsave(&guc->submission_state.lock, flags);
+ list_for_each_entry_safe(ce, cn,
+ &guc->submission_state.destroyed_contexts,
+ destroyed_link) {
+ list_del_init(&ce->destroyed_link);
+ spin_unlock_irqrestore(&guc->submission_state.lock, flags);
+ guc_lrc_desc_unpin(ce);
+ spin_lock_irqsave(&guc->submission_state.lock, flags);
+ }
+ spin_unlock_irqrestore(&guc->submission_state.lock, flags);
+}
+
+static void destroyed_worker_func(struct work_struct *w)
+{
+ struct intel_guc *guc = container_of(w, struct intel_guc,
+ submission_state.destroyed_worker);
+ struct intel_gt *gt = guc_to_gt(guc);
+ int tmp;
+
+ with_intel_gt_pm(gt, tmp)
+ deregister_destroyed_contexts(guc);
+}
+
static void guc_context_destroy(struct kref *kref)
{
struct intel_context *ce = container_of(kref, typeof(*ce), ref);
- struct intel_runtime_pm *runtime_pm = ce->engine->uncore->rpm;
struct intel_guc *guc = ce_to_guc(ce);
- intel_wakeref_t wakeref;
unsigned long flags;
- bool disabled;
+ bool destroy;

/*
* If the guc_id is invalid this context has been stolen and we can free
* it immediately. Also can be freed immediately if the context is not
* registered with the GuC or the GuC is in the middle of a reset.
*/
- if (context_guc_id_invalid(ce)) {
- __guc_context_destroy(ce);
- return;
- } else if (submission_disabled(guc) ||
- !lrc_desc_registered(guc, ce->guc_id.id)) {
- release_guc_id(guc, ce);
- __guc_context_destroy(ce);
- return;
- }
-
- /*
- * We have to acquire the context spinlock and check guc_id again, if it
- * is valid it hasn't been stolen and needs to be deregistered. We
- * delete this context from the list of unpinned guc_id available to
- * steal to seal a race with guc_lrc_desc_pin(). When the G2H CTB
- * returns indicating this context has been deregistered the guc_id is
- * returned to the pool of available guc_id.
- */
- spin_lock_irqsave(&guc->contexts_lock, flags);
- if (context_guc_id_invalid(ce)) {
- spin_unlock_irqrestore(&guc->contexts_lock, flags);
- __guc_context_destroy(ce);
- return;
- }
-
- if (!list_empty(&ce->guc_id.link))
- list_del_init(&ce->guc_id.link);
- spin_unlock_irqrestore(&guc->contexts_lock, flags);
-
- /* Seal race with Reset */
- spin_lock_irqsave(&ce->guc_state.lock, flags);
- disabled = submission_disabled(guc);
- if (likely(!disabled)) {
- set_context_destroyed(ce);
- clr_context_registered(ce);
+ spin_lock_irqsave(&guc->submission_state.lock, flags);
+ destroy = submission_disabled(guc) || context_guc_id_invalid(ce) ||
+ !lrc_desc_registered(guc, ce->guc_id.id);
+ if (likely(!destroy)) {
+ if (!list_empty(&ce->guc_id.link))
+ list_del_init(&ce->guc_id.link);
+ list_add_tail(&ce->destroyed_link,
+ &guc->submission_state.destroyed_contexts);
+ } else {
+ __release_guc_id(guc, ce);
}
- spin_unlock_irqrestore(&ce->guc_state.lock, flags);
- if (unlikely(disabled)) {
- release_guc_id(guc, ce);
+ spin_unlock_irqrestore(&guc->submission_state.lock, flags);
+ if (unlikely(destroy)) {
__guc_context_destroy(ce);
return;
}

/*
- * We defer GuC context deregistration until the context is destroyed
- * in order to save on CTBs. With this optimization ideally we only need
- * 1 CTB to register the context during the first pin and 1 CTB to
- * deregister the context when the context is destroyed. Without this
- * optimization, a CTB would be needed every pin & unpin.
- *
- * XXX: Need to acqiure the runtime wakeref as this can be triggered
- * from context_free_worker when runtime wakeref is not held.
- * guc_lrc_desc_unpin requires the runtime as a GuC register is written
- * in H2G CTB to deregister the context. A future patch may defer this
- * H2G CTB if the runtime wakeref is zero.
+ * We use a worker to issue the H2G to deregister the context as we can
+ * take the GT PM for the first time which isn't allowed from an atomic
+ * context.
*/
- with_intel_runtime_pm(runtime_pm, wakeref)
- guc_lrc_desc_unpin(ce);
+ queue_work(system_unbound_wq, &guc->submission_state.destroyed_worker);
}

static int guc_context_alloc(struct intel_context *ce)
@@ -2703,8 +2744,8 @@ static bool __guc_submission_selected(struct intel_guc *guc)

void intel_guc_submission_init_early(struct intel_guc *guc)
{
- guc->max_guc_ids = GUC_MAX_LRC_DESCRIPTORS;
- guc->num_guc_ids = GUC_MAX_LRC_DESCRIPTORS;
+ guc->submission_state.max_guc_ids = GUC_MAX_LRC_DESCRIPTORS;
+ guc->submission_state.num_guc_ids = GUC_MAX_LRC_DESCRIPTORS;
guc->submission_supported = __guc_submission_supported(guc);
guc->submission_selected = __guc_submission_selected(guc);
}
@@ -2714,10 +2755,10 @@ g2h_context_lookup(struct intel_guc *guc, u32 desc_idx)
{
struct intel_context *ce;

- if (unlikely(desc_idx >= guc->max_guc_ids)) {
+ if (unlikely(desc_idx >= guc->submission_state.max_guc_ids)) {
drm_err(&guc_to_gt(guc)->i915->drm,
"Invalid desc_idx %u, max %u",
- desc_idx, guc->max_guc_ids);
+ desc_idx, guc->submission_state.max_guc_ids);
return NULL;
}

@@ -2771,6 +2812,7 @@ int intel_guc_deregister_done_process_msg(struct intel_guc *guc,
intel_context_put(ce);
} else if (context_destroyed(ce)) {
/* Context has been destroyed */
+ intel_gt_pm_put_async(guc_to_gt(guc));
release_guc_id(guc, ce);
__guc_context_destroy(ce);
}
@@ -3065,8 +3107,10 @@ void intel_guc_submission_print_info(struct intel_guc *guc,

drm_printf(p, "GuC Number Outstanding Submission G2H: %u\n",
atomic_read(&guc->outstanding_submission_g2h));
- drm_printf(p, "GuC Number GuC IDs: %u\n", guc->num_guc_ids);
- drm_printf(p, "GuC Max GuC IDs: %u\n", guc->max_guc_ids);
+ drm_printf(p, "GuC Number GuC IDs: %u\n",
+ guc->submission_state.num_guc_ids);
+ drm_printf(p, "GuC Max GuC IDs: %u\n",
+ guc->submission_state.max_guc_ids);
drm_printf(p, "GuC tasklet count: %u\n\n",
atomic_read(&sched_engine->tasklet.count));

--
2.32.0