mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 22:21:59 +07:00
4c60b1aaa2
Refactor the backends to handle the deferred context allocation in a consistent manner, and allow calling it as an explicit first step in pinning a context for the first time. This should make it easier for backends to keep track of partially constructed contexts from initialisation. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190809182518.20486-2-chris@chris-wilson.co.uk
334 lines
7.0 KiB
C
334 lines
7.0 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 "gem/i915_gem_context.h"
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#include "gem/i915_gem_pm.h"
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#include "i915_drv.h"
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#include "i915_globals.h"
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#include "intel_context.h"
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#include "intel_engine.h"
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#include "intel_engine_pm.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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static 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_create(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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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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return ce;
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}
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int __intel_context_do_pin(struct intel_context *ce)
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{
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int err;
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if (mutex_lock_interruptible(&ce->pin_mutex))
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return -EINTR;
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if (likely(!atomic_read(&ce->pin_count))) {
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intel_wakeref_t wakeref;
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if (unlikely(!test_bit(CONTEXT_ALLOC_BIT, &ce->flags))) {
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err = ce->ops->alloc(ce);
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if (unlikely(err))
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goto err;
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__set_bit(CONTEXT_ALLOC_BIT, &ce->flags);
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}
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err = 0;
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with_intel_runtime_pm(&ce->engine->i915->runtime_pm, wakeref)
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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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GEM_TRACE("%s context:%llx pin ring:{head:%04x, tail:%04x}\n",
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ce->engine->name, ce->ring->timeline->fence_context,
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ce->ring->head, ce->ring->tail);
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i915_gem_context_get(ce->gem_context); /* for ctx->ppgtt */
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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 0;
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err:
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mutex_unlock(&ce->pin_mutex);
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return 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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GEM_TRACE("%s context:%llx retire\n",
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ce->engine->name, ce->ring->timeline->fence_context);
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ce->ops->unpin(ce);
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i915_gem_context_put(ce->gem_context);
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intel_context_active_release(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 int __context_pin_state(struct i915_vma *vma)
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{
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u64 flags;
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int err;
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flags = i915_ggtt_pin_bias(vma) | PIN_OFFSET_BIAS;
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flags |= PIN_HIGH | PIN_GLOBAL;
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err = i915_vma_pin(vma, 0, 0, flags);
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if (err)
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return err;
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/*
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* And mark it as a globally pinned object to let the shrinker know
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* it cannot reclaim the object until we release it.
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*/
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i915_vma_make_unshrinkable(vma);
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vma->obj->mm.dirty = true;
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return 0;
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}
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static void __context_unpin_state(struct i915_vma *vma)
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{
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__i915_vma_unpin(vma);
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i915_vma_make_shrinkable(vma);
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}
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static void __intel_context_retire(struct i915_active *active)
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{
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struct intel_context *ce = container_of(active, typeof(*ce), active);
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GEM_TRACE("%s context:%llx retire\n",
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ce->engine->name, ce->ring->timeline->fence_context);
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if (ce->state)
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__context_unpin_state(ce->state);
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intel_ring_unpin(ce->ring);
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intel_context_put(ce);
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}
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static int __intel_context_active(struct i915_active *active)
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{
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struct intel_context *ce = container_of(active, typeof(*ce), active);
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int err;
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intel_context_get(ce);
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err = intel_ring_pin(ce->ring);
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if (err)
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goto err_put;
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if (!ce->state)
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return 0;
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err = __context_pin_state(ce->state);
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if (err)
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goto err_ring;
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return 0;
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err_ring:
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intel_ring_unpin(ce->ring);
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err_put:
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intel_context_put(ce);
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return err;
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}
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int intel_context_active_acquire(struct intel_context *ce)
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{
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int err;
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err = i915_active_acquire(&ce->active);
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if (err)
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return err;
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/* Preallocate tracking nodes */
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if (!i915_gem_context_is_kernel(ce->gem_context)) {
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err = i915_active_acquire_preallocate_barrier(&ce->active,
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ce->engine);
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if (err) {
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i915_active_release(&ce->active);
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return err;
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}
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}
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return 0;
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}
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void intel_context_active_release(struct intel_context *ce)
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{
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/* Nodes preallocated in intel_context_active() */
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i915_active_acquire_barrier(&ce->active);
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i915_active_release(&ce->active);
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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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GEM_BUG_ON(!engine->cops);
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kref_init(&ce->ref);
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ce->gem_context = ctx;
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ce->vm = i915_vm_get(ctx->vm ?: &engine->gt->ggtt->vm);
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ce->engine = engine;
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ce->ops = engine->cops;
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ce->sseu = engine->sseu;
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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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i915_active_init(ctx->i915, &ce->active,
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__intel_context_active, __intel_context_retire);
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}
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void intel_context_fini(struct intel_context *ce)
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{
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i915_vm_put(ce->vm);
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mutex_destroy(&ce->pin_mutex);
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i915_active_fini(&ce->active);
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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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void intel_context_enter_engine(struct intel_context *ce)
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{
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intel_engine_pm_get(ce->engine);
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}
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void intel_context_exit_engine(struct intel_context *ce)
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{
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intel_engine_pm_put(ce->engine);
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}
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int intel_context_prepare_remote_request(struct intel_context *ce,
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struct i915_request *rq)
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{
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struct intel_timeline *tl = ce->ring->timeline;
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int err;
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/* Only suitable for use in remotely modifying this context */
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GEM_BUG_ON(rq->hw_context == ce);
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if (rq->timeline != tl) { /* beware timeline sharing */
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err = mutex_lock_interruptible_nested(&tl->mutex,
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SINGLE_DEPTH_NESTING);
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if (err)
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return err;
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/* Queue this switch after current activity by this context. */
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err = i915_active_request_set(&tl->last_request, rq);
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if (err)
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goto unlock;
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}
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lockdep_assert_held(&tl->mutex);
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/*
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* Guarantee context image and the timeline remains pinned until the
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* modifying request is retired by setting the ce activity tracker.
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*
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* But we only need to take one pin on the account of it. Or in other
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* words transfer the pinned ce object to tracked active request.
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*/
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GEM_BUG_ON(i915_active_is_idle(&ce->active));
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err = i915_active_ref(&ce->active, rq->fence.context, rq);
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unlock:
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if (rq->timeline != tl)
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mutex_unlock(&tl->mutex);
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return err;
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}
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struct i915_request *intel_context_create_request(struct intel_context *ce)
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{
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struct i915_request *rq;
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int err;
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err = intel_context_pin(ce);
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if (unlikely(err))
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return ERR_PTR(err);
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rq = i915_request_create(ce);
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intel_context_unpin(ce);
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return rq;
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}
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#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
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#include "selftest_context.c"
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#endif
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