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/*
* SPDX-License-Identifier: MIT
*
* Copyright © 2019 Intel Corporation
*/
#include "gem/i915_gem_context.h"
#include "gem/i915_gem_pm.h"
#include "i915_drv.h"
#include "i915_globals.h"
#include "intel_context.h"
#include "intel_engine.h"
#include "intel_engine_pm.h"
static struct i915_global_context {
struct i915_global base;
struct kmem_cache *slab_ce;
} global;
static struct intel_context *intel_context_alloc(void)
{
return kmem_cache_zalloc(global.slab_ce, GFP_KERNEL);
}
void intel_context_free(struct intel_context *ce)
{
kmem_cache_free(global.slab_ce, ce);
}
struct intel_context *
intel_context_create(struct i915_gem_context *ctx,
struct intel_engine_cs *engine)
{
struct intel_context *ce;
ce = intel_context_alloc();
if (!ce)
return ERR_PTR(-ENOMEM);
intel_context_init(ce, ctx, engine);
return ce;
}
int __intel_context_do_pin(struct intel_context *ce)
{
int err;
if (mutex_lock_interruptible(&ce->pin_mutex))
return -EINTR;
if (likely(!atomic_read(&ce->pin_count))) {
intel_wakeref_t wakeref;
err = 0;
with_intel_runtime_pm(&ce->engine->i915->runtime_pm, wakeref)
err = ce->ops->pin(ce);
if (err)
goto err;
i915_gem_context_get(ce->gem_context); /* for ctx->ppgtt */
smp_mb__before_atomic(); /* flush pin before it is visible */
}
atomic_inc(&ce->pin_count);
GEM_BUG_ON(!intel_context_is_pinned(ce)); /* no overflow! */
mutex_unlock(&ce->pin_mutex);
return 0;
err:
mutex_unlock(&ce->pin_mutex);
return 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 */
intel_context_get(ce);
mutex_lock_nested(&ce->pin_mutex, SINGLE_DEPTH_NESTING);
if (likely(atomic_dec_and_test(&ce->pin_count))) {
ce->ops->unpin(ce);
i915_gem_context_put(ce->gem_context);
intel_context_active_release(ce);
}
mutex_unlock(&ce->pin_mutex);
intel_context_put(ce);
}
static int __context_pin_state(struct i915_vma *vma, unsigned long flags)
{
int err;
err = i915_vma_pin(vma, 0, 0, flags | PIN_GLOBAL);
if (err)
return err;
/*
* And mark it as a globally pinned object to let the shrinker know
* it cannot reclaim the object until we release it.
*/
vma->obj->pin_global++;
vma->obj->mm.dirty = true;
return 0;
}
static void __context_unpin_state(struct i915_vma *vma)
{
vma->obj->pin_global--;
__i915_vma_unpin(vma);
}
static void intel_context_retire(struct i915_active *active)
{
struct intel_context *ce = container_of(active, typeof(*ce), active);
if (ce->state)
__context_unpin_state(ce->state);
intel_context_put(ce);
}
void
intel_context_init(struct intel_context *ce,
struct i915_gem_context *ctx,
struct intel_engine_cs *engine)
{
GEM_BUG_ON(!engine->cops);
kref_init(&ce->ref);
ce->gem_context = ctx;
ce->engine = engine;
ce->ops = engine->cops;
ce->sseu = engine->sseu;
INIT_LIST_HEAD(&ce->signal_link);
INIT_LIST_HEAD(&ce->signals);
mutex_init(&ce->pin_mutex);
i915_active_init(ctx->i915, &ce->active, intel_context_retire);
}
int intel_context_active_acquire(struct intel_context *ce, unsigned long flags)
{
int err;
if (!i915_active_acquire(&ce->active))
return 0;
intel_context_get(ce);
if (!ce->state)
return 0;
err = __context_pin_state(ce->state, flags);
if (err) {
i915_active_cancel(&ce->active);
intel_context_put(ce);
return err;
}
/* Preallocate tracking nodes */
if (!i915_gem_context_is_kernel(ce->gem_context)) {
err = i915_active_acquire_preallocate_barrier(&ce->active,
ce->engine);
if (err) {
i915_active_release(&ce->active);
return err;
}
}
return 0;
}
void intel_context_active_release(struct intel_context *ce)
{
/* Nodes preallocated in intel_context_active() */
i915_active_acquire_barrier(&ce->active);
i915_active_release(&ce->active);
}
static void i915_global_context_shrink(void)
{
kmem_cache_shrink(global.slab_ce);
}
static void i915_global_context_exit(void)
{
kmem_cache_destroy(global.slab_ce);
}
static struct i915_global_context global = { {
.shrink = i915_global_context_shrink,
.exit = i915_global_context_exit,
} };
int __init i915_global_context_init(void)
{
global.slab_ce = KMEM_CACHE(intel_context, SLAB_HWCACHE_ALIGN);
if (!global.slab_ce)
return -ENOMEM;
i915_global_register(&global.base);
return 0;
}
void intel_context_enter_engine(struct intel_context *ce)
{
intel_engine_pm_get(ce->engine);
}
void intel_context_exit_engine(struct intel_context *ce)
{
intel_engine_pm_put(ce->engine);
}
struct i915_request *intel_context_create_request(struct intel_context *ce)
{
struct i915_request *rq;
int err;
err = intel_context_pin(ce);
if (unlikely(err))
return ERR_PTR(err);
rq = i915_request_create(ce);
intel_context_unpin(ce);
return rq;
}
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