diff options
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem.c | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_context.c | 44 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_context.c | 58 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_context.h | 38 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_context_types.h | 8 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_lrc.c | 4 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_ringbuffer.c | 4 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/selftests/mock_engine.c | 2 |
8 files changed, 104 insertions, 56 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 0f32ec12896c..e7e8c236bc8e 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -4667,7 +4667,7 @@ static int __intel_engines_record_defaults(struct drm_i915_private *i915) if (!state) continue; - GEM_BUG_ON(ce->pin_count); + GEM_BUG_ON(intel_context_is_pinned(ce)); /* * As we will hold a reference to the logical state, it will diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c index 995bc28d53d6..f9a21a891aa4 100644 --- a/drivers/gpu/drm/i915/i915_gem_context.c +++ b/drivers/gpu/drm/i915/i915_gem_context.c @@ -810,7 +810,6 @@ static int get_sseu(struct i915_gem_context *ctx, struct drm_i915_gem_context_param_sseu user_sseu; struct intel_engine_cs *engine; struct intel_context *ce; - int ret; if (args->size == 0) goto out; @@ -830,21 +829,16 @@ static int get_sseu(struct i915_gem_context *ctx, if (!engine) return -EINVAL; - ce = intel_context_instance(ctx, engine); + ce = intel_context_pin_lock(ctx, engine); /* serialises with set_sseu */ if (IS_ERR(ce)) return PTR_ERR(ce); - /* Only use for mutex here is to serialize get_param and set_param. */ - ret = mutex_lock_interruptible(&ctx->i915->drm.struct_mutex); - if (ret) - return ret; - user_sseu.slice_mask = ce->sseu.slice_mask; user_sseu.subslice_mask = ce->sseu.subslice_mask; user_sseu.min_eus_per_subslice = ce->sseu.min_eus_per_subslice; user_sseu.max_eus_per_subslice = ce->sseu.max_eus_per_subslice; - mutex_unlock(&ctx->i915->drm.struct_mutex); + intel_context_pin_unlock(ce); if (copy_to_user(u64_to_user_ptr(args->value), &user_sseu, sizeof(user_sseu))) @@ -940,23 +934,28 @@ static int gen8_emit_rpcs_config(struct i915_request *rq, } static int -gen8_modify_rpcs_gpu(struct intel_context *ce, - struct intel_engine_cs *engine, - struct intel_sseu sseu) +gen8_modify_rpcs(struct intel_context *ce, struct intel_sseu sseu) { - struct drm_i915_private *i915 = engine->i915; + struct drm_i915_private *i915 = ce->engine->i915; struct i915_request *rq, *prev; intel_wakeref_t wakeref; int ret; - GEM_BUG_ON(!ce->pin_count); + lockdep_assert_held(&ce->pin_mutex); - lockdep_assert_held(&i915->drm.struct_mutex); + /* + * If the context is not idle, we have to submit an ordered request to + * modify its context image via the kernel context (writing to our own + * image, or into the registers directory, does not stick). Pristine + * and idle contexts will be configured on pinning. + */ + if (!intel_context_is_pinned(ce)) + return 0; /* Submitting requests etc needs the hw awake. */ wakeref = intel_runtime_pm_get(i915); - rq = i915_request_alloc(engine, i915->kernel_context); + rq = i915_request_alloc(ce->engine, i915->kernel_context); if (IS_ERR(rq)) { ret = PTR_ERR(rq); goto out_put; @@ -1010,25 +1009,20 @@ __i915_gem_context_reconfigure_sseu(struct i915_gem_context *ctx, GEM_BUG_ON(INTEL_GEN(ctx->i915) < 8); GEM_BUG_ON(engine->id != RCS0); - ce = intel_context_instance(ctx, engine); + ce = intel_context_pin_lock(ctx, engine); if (IS_ERR(ce)) return PTR_ERR(ce); /* Nothing to do if unmodified. */ if (!memcmp(&ce->sseu, &sseu, sizeof(sseu))) - return 0; - - /* - * If context is not idle we have to submit an ordered request to modify - * its context image via the kernel context. Pristine and idle contexts - * will be configured on pinning. - */ - if (ce->pin_count) - ret = gen8_modify_rpcs_gpu(ce, engine, sseu); + goto unlock; + ret = gen8_modify_rpcs(ce, sseu); if (!ret) ce->sseu = sseu; +unlock: + intel_context_pin_unlock(ce); return ret; } diff --git a/drivers/gpu/drm/i915/intel_context.c b/drivers/gpu/drm/i915/intel_context.c index 4c1dacb69f51..5a16c9bb2778 100644 --- a/drivers/gpu/drm/i915/intel_context.c +++ b/drivers/gpu/drm/i915/intel_context.c @@ -102,7 +102,7 @@ void __intel_context_remove(struct intel_context *ce) spin_unlock(&ctx->hw_contexts_lock); } -struct intel_context * +static struct intel_context * intel_context_instance(struct i915_gem_context *ctx, struct intel_engine_cs *engine) { @@ -127,22 +127,43 @@ intel_context_instance(struct i915_gem_context *ctx, } struct intel_context * +intel_context_pin_lock(struct i915_gem_context *ctx, + struct intel_engine_cs *engine) + __acquires(ce->pin_mutex) +{ + struct intel_context *ce; + + ce = intel_context_instance(ctx, engine); + if (IS_ERR(ce)) + return ce; + + if (mutex_lock_interruptible(&ce->pin_mutex)) + return ERR_PTR(-EINTR); + + return ce; +} + +struct intel_context * intel_context_pin(struct i915_gem_context *ctx, struct intel_engine_cs *engine) { struct intel_context *ce; int err; - lockdep_assert_held(&ctx->i915->drm.struct_mutex); - ce = intel_context_instance(ctx, engine); if (IS_ERR(ce)) return ce; - if (unlikely(!ce->pin_count++)) { + if (likely(atomic_inc_not_zero(&ce->pin_count))) + return ce; + + if (mutex_lock_interruptible(&ce->pin_mutex)) + return ERR_PTR(-EINTR); + + if (likely(!atomic_read(&ce->pin_count))) { err = ce->ops->pin(ce); if (err) - goto err_unpin; + goto err; mutex_lock(&ctx->mutex); list_add(&ce->active_link, &ctx->active_engines); @@ -150,16 +171,35 @@ intel_context_pin(struct i915_gem_context *ctx, i915_gem_context_get(ctx); GEM_BUG_ON(ce->gem_context != ctx); + + smp_mb__before_atomic(); /* flush pin before it is visible */ } - GEM_BUG_ON(!ce->pin_count); /* no overflow! */ + atomic_inc(&ce->pin_count); + GEM_BUG_ON(!intel_context_is_pinned(ce)); /* no overflow! */ + + mutex_unlock(&ce->pin_mutex); return ce; -err_unpin: - ce->pin_count = 0; +err: + mutex_unlock(&ce->pin_mutex); return ERR_PTR(err); } +void intel_context_unpin(struct intel_context *ce) +{ + if (likely(atomic_add_unless(&ce->pin_count, -1, 1))) + return; + + /* We may be called from inside intel_context_pin() to evict another */ + mutex_lock_nested(&ce->pin_mutex, SINGLE_DEPTH_NESTING); + + if (likely(atomic_dec_and_test(&ce->pin_count))) + ce->ops->unpin(ce); + + mutex_unlock(&ce->pin_mutex); +} + static void intel_context_retire(struct i915_active_request *active, struct i915_request *rq) { @@ -181,6 +221,8 @@ intel_context_init(struct intel_context *ce, INIT_LIST_HEAD(&ce->signal_link); INIT_LIST_HEAD(&ce->signals); + mutex_init(&ce->pin_mutex); + /* Use the whole device by default */ ce->sseu = intel_device_default_sseu(ctx->i915); diff --git a/drivers/gpu/drm/i915/intel_context.h b/drivers/gpu/drm/i915/intel_context.h index ea21473891f7..9546d932406a 100644 --- a/drivers/gpu/drm/i915/intel_context.h +++ b/drivers/gpu/drm/i915/intel_context.h @@ -7,6 +7,8 @@ #ifndef __INTEL_CONTEXT_H__ #define __INTEL_CONTEXT_H__ +#include <linux/lockdep.h> + #include "intel_context_types.h" #include "intel_engine_types.h" @@ -29,18 +31,30 @@ intel_context_lookup(struct i915_gem_context *ctx, struct intel_engine_cs *engine); /** - * intel_context_instance - Lookup or allocate the HW context for (ctx, engine) + * intel_context_pin_lock - Stablises the 'pinned' status of the HW context * @ctx - the parent GEM context * @engine - the target HW engine * - * Returns the existing HW context for this pair of (GEM context, engine), or - * allocates and initialises a fresh context. Once allocated, the HW context - * remains resident until the GEM context is destroyed. + * Acquire a lock on the pinned status of the HW context, such that the context + * can neither be bound to the GPU or unbound whilst the lock is held, i.e. + * intel_context_is_pinned() remains stable. */ struct intel_context * -intel_context_instance(struct i915_gem_context *ctx, +intel_context_pin_lock(struct i915_gem_context *ctx, struct intel_engine_cs *engine); +static inline bool +intel_context_is_pinned(struct intel_context *ce) +{ + return atomic_read(&ce->pin_count); +} + +static inline void intel_context_pin_unlock(struct intel_context *ce) +__releases(ce->pin_mutex) +{ + mutex_unlock(&ce->pin_mutex); +} + struct intel_context * __intel_context_insert(struct i915_gem_context *ctx, struct intel_engine_cs *engine, @@ -53,18 +67,10 @@ intel_context_pin(struct i915_gem_context *ctx, struct intel_engine_cs *engine); static inline void __intel_context_pin(struct intel_context *ce) { - GEM_BUG_ON(!ce->pin_count); - ce->pin_count++; + GEM_BUG_ON(!intel_context_is_pinned(ce)); + atomic_inc(&ce->pin_count); } -static inline void intel_context_unpin(struct intel_context *ce) -{ - GEM_BUG_ON(!ce->pin_count); - if (--ce->pin_count) - return; - - GEM_BUG_ON(!ce->ops); - ce->ops->unpin(ce); -} +void intel_context_unpin(struct intel_context *ce); #endif /* __INTEL_CONTEXT_H__ */ diff --git a/drivers/gpu/drm/i915/intel_context_types.h b/drivers/gpu/drm/i915/intel_context_types.h index 804fa93de853..6dc9b4b9067b 100644 --- a/drivers/gpu/drm/i915/intel_context_types.h +++ b/drivers/gpu/drm/i915/intel_context_types.h @@ -8,6 +8,7 @@ #define __INTEL_CONTEXT_TYPES__ #include <linux/list.h> +#include <linux/mutex.h> #include <linux/rbtree.h> #include <linux/types.h> @@ -38,14 +39,19 @@ struct intel_context { struct i915_gem_context *gem_context; struct intel_engine_cs *engine; struct intel_engine_cs *active; + struct list_head active_link; struct list_head signal_link; struct list_head signals; + struct i915_vma *state; struct intel_ring *ring; + u32 *lrc_reg_state; u64 lrc_desc; - int pin_count; + + atomic_t pin_count; + struct mutex pin_mutex; /* guards pinning and associated on-gpuing */ /** * active_tracker: Active tracker for the external rq activity diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index 44148433d237..748352d513d6 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -1244,7 +1244,7 @@ static void __execlists_context_fini(struct intel_context *ce) static void execlists_context_destroy(struct intel_context *ce) { - GEM_BUG_ON(ce->pin_count); + GEM_BUG_ON(intel_context_is_pinned(ce)); if (ce->state) __execlists_context_fini(ce); @@ -1481,7 +1481,7 @@ static int execlists_request_alloc(struct i915_request *request) { int ret; - GEM_BUG_ON(!request->hw_context->pin_count); + GEM_BUG_ON(!intel_context_is_pinned(request->hw_context)); /* * Flush enough space to reduce the likelihood of waiting after diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 03656021d04c..cc4fcd89b845 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -1357,7 +1357,7 @@ static void __ring_context_fini(struct intel_context *ce) static void ring_context_destroy(struct intel_context *ce) { - GEM_BUG_ON(ce->pin_count); + GEM_BUG_ON(intel_context_is_pinned(ce)); if (ce->state) __ring_context_fini(ce); @@ -1918,7 +1918,7 @@ static int ring_request_alloc(struct i915_request *request) { int ret; - GEM_BUG_ON(!request->hw_context->pin_count); + GEM_BUG_ON(!intel_context_is_pinned(request->hw_context)); GEM_BUG_ON(request->timeline->has_initial_breadcrumb); /* diff --git a/drivers/gpu/drm/i915/selftests/mock_engine.c b/drivers/gpu/drm/i915/selftests/mock_engine.c index 99d7463218d0..f6d120e05ee4 100644 --- a/drivers/gpu/drm/i915/selftests/mock_engine.c +++ b/drivers/gpu/drm/i915/selftests/mock_engine.c @@ -131,7 +131,7 @@ static void mock_context_unpin(struct intel_context *ce) static void mock_context_destroy(struct intel_context *ce) { - GEM_BUG_ON(ce->pin_count); + GEM_BUG_ON(intel_context_is_pinned(ce)); if (ce->ring) mock_ring_free(ce->ring); |