mirror of https://gitee.com/openkylin/linux.git
271 lines
5.5 KiB
C
271 lines
5.5 KiB
C
/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright © 2019 Intel Corporation
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*/
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#include "i915_drv.h"
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#include "i915_gem_context.h"
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#include "i915_globals.h"
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#include "intel_context.h"
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#include "intel_ringbuffer.h"
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static struct i915_global_context {
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struct i915_global base;
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struct kmem_cache *slab_ce;
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} global;
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struct intel_context *intel_context_alloc(void)
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{
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return kmem_cache_zalloc(global.slab_ce, GFP_KERNEL);
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}
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void intel_context_free(struct intel_context *ce)
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{
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kmem_cache_free(global.slab_ce, ce);
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}
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struct intel_context *
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intel_context_lookup(struct i915_gem_context *ctx,
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struct intel_engine_cs *engine)
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{
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struct intel_context *ce = NULL;
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struct rb_node *p;
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spin_lock(&ctx->hw_contexts_lock);
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p = ctx->hw_contexts.rb_node;
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while (p) {
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struct intel_context *this =
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rb_entry(p, struct intel_context, node);
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if (this->engine == engine) {
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GEM_BUG_ON(this->gem_context != ctx);
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ce = this;
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break;
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}
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if (this->engine < engine)
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p = p->rb_right;
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else
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p = p->rb_left;
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}
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spin_unlock(&ctx->hw_contexts_lock);
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return ce;
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}
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struct intel_context *
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__intel_context_insert(struct i915_gem_context *ctx,
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struct intel_engine_cs *engine,
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struct intel_context *ce)
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{
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struct rb_node **p, *parent;
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int err = 0;
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spin_lock(&ctx->hw_contexts_lock);
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parent = NULL;
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p = &ctx->hw_contexts.rb_node;
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while (*p) {
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struct intel_context *this;
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parent = *p;
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this = rb_entry(parent, struct intel_context, node);
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if (this->engine == engine) {
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err = -EEXIST;
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ce = this;
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break;
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}
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if (this->engine < engine)
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p = &parent->rb_right;
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else
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p = &parent->rb_left;
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}
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if (!err) {
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rb_link_node(&ce->node, parent, p);
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rb_insert_color(&ce->node, &ctx->hw_contexts);
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}
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spin_unlock(&ctx->hw_contexts_lock);
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return ce;
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}
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void __intel_context_remove(struct intel_context *ce)
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{
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struct i915_gem_context *ctx = ce->gem_context;
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spin_lock(&ctx->hw_contexts_lock);
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rb_erase(&ce->node, &ctx->hw_contexts);
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spin_unlock(&ctx->hw_contexts_lock);
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}
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static struct intel_context *
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intel_context_instance(struct i915_gem_context *ctx,
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struct intel_engine_cs *engine)
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{
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struct intel_context *ce, *pos;
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ce = intel_context_lookup(ctx, engine);
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if (likely(ce))
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return ce;
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ce = intel_context_alloc();
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if (!ce)
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return ERR_PTR(-ENOMEM);
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intel_context_init(ce, ctx, engine);
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pos = __intel_context_insert(ctx, engine, ce);
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if (unlikely(pos != ce)) /* Beaten! Use their HW context instead */
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intel_context_free(ce);
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GEM_BUG_ON(intel_context_lookup(ctx, engine) != pos);
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return pos;
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}
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struct intel_context *
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intel_context_pin_lock(struct i915_gem_context *ctx,
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struct intel_engine_cs *engine)
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__acquires(ce->pin_mutex)
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{
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struct intel_context *ce;
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ce = intel_context_instance(ctx, engine);
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if (IS_ERR(ce))
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return ce;
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if (mutex_lock_interruptible(&ce->pin_mutex))
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return ERR_PTR(-EINTR);
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return ce;
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}
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struct intel_context *
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intel_context_pin(struct i915_gem_context *ctx,
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struct intel_engine_cs *engine)
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{
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struct intel_context *ce;
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int err;
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ce = intel_context_instance(ctx, engine);
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if (IS_ERR(ce))
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return ce;
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if (likely(atomic_inc_not_zero(&ce->pin_count)))
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return ce;
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if (mutex_lock_interruptible(&ce->pin_mutex))
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return ERR_PTR(-EINTR);
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if (likely(!atomic_read(&ce->pin_count))) {
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err = ce->ops->pin(ce);
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if (err)
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goto err;
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i915_gem_context_get(ctx);
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GEM_BUG_ON(ce->gem_context != ctx);
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mutex_lock(&ctx->mutex);
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list_add(&ce->active_link, &ctx->active_engines);
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mutex_unlock(&ctx->mutex);
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intel_context_get(ce);
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smp_mb__before_atomic(); /* flush pin before it is visible */
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}
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atomic_inc(&ce->pin_count);
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GEM_BUG_ON(!intel_context_is_pinned(ce)); /* no overflow! */
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mutex_unlock(&ce->pin_mutex);
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return ce;
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err:
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mutex_unlock(&ce->pin_mutex);
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return ERR_PTR(err);
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}
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void intel_context_unpin(struct intel_context *ce)
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{
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if (likely(atomic_add_unless(&ce->pin_count, -1, 1)))
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return;
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/* We may be called from inside intel_context_pin() to evict another */
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intel_context_get(ce);
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mutex_lock_nested(&ce->pin_mutex, SINGLE_DEPTH_NESTING);
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if (likely(atomic_dec_and_test(&ce->pin_count))) {
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ce->ops->unpin(ce);
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mutex_lock(&ce->gem_context->mutex);
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list_del(&ce->active_link);
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mutex_unlock(&ce->gem_context->mutex);
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i915_gem_context_put(ce->gem_context);
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intel_context_put(ce);
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}
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mutex_unlock(&ce->pin_mutex);
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intel_context_put(ce);
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}
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static void intel_context_retire(struct i915_active_request *active,
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struct i915_request *rq)
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{
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struct intel_context *ce =
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container_of(active, typeof(*ce), active_tracker);
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intel_context_unpin(ce);
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}
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void
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intel_context_init(struct intel_context *ce,
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struct i915_gem_context *ctx,
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struct intel_engine_cs *engine)
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{
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kref_init(&ce->ref);
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ce->gem_context = ctx;
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ce->engine = engine;
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ce->ops = engine->cops;
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ce->saturated = 0;
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INIT_LIST_HEAD(&ce->signal_link);
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INIT_LIST_HEAD(&ce->signals);
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mutex_init(&ce->pin_mutex);
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/* Use the whole device by default */
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ce->sseu = intel_device_default_sseu(ctx->i915);
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i915_active_request_init(&ce->active_tracker,
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NULL, intel_context_retire);
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}
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static void i915_global_context_shrink(void)
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{
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kmem_cache_shrink(global.slab_ce);
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}
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static void i915_global_context_exit(void)
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{
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kmem_cache_destroy(global.slab_ce);
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}
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static struct i915_global_context global = { {
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.shrink = i915_global_context_shrink,
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.exit = i915_global_context_exit,
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} };
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int __init i915_global_context_init(void)
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{
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global.slab_ce = KMEM_CACHE(intel_context, SLAB_HWCACHE_ALIGN);
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if (!global.slab_ce)
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return -ENOMEM;
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i915_global_register(&global.base);
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return 0;
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}
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