linux_dsm_epyc7002/drivers/gpu/drm/i915/gt/intel_context.c
Chris Wilson 1b8bfc5726 drm/i915/gt: Mark context->state vma as active while pinned
As we use the active state to keep the vma alive while we are reading
its contents during GPU error capture, we need to mark the
context->state vma as active during execution if we want to include it
in the error state.

Reported-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: b1e3177bd1 ("drm/i915: Coordinate i915_active with its own mutex")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Acked-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200110110402.1231745-2-chris@chris-wilson.co.uk
2020-01-10 14:48:34 +00:00

357 lines
7.2 KiB
C

/*
* 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"
#include "intel_ring.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 intel_engine_cs *engine)
{
struct intel_context *ce;
ce = intel_context_alloc();
if (!ce)
return ERR_PTR(-ENOMEM);
intel_context_init(ce, engine);
return ce;
}
int intel_context_alloc_state(struct intel_context *ce)
{
int err = 0;
if (mutex_lock_interruptible(&ce->pin_mutex))
return -EINTR;
if (!test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) {
err = ce->ops->alloc(ce);
if (unlikely(err))
goto unlock;
set_bit(CONTEXT_ALLOC_BIT, &ce->flags);
}
unlock:
mutex_unlock(&ce->pin_mutex);
return err;
}
static int intel_context_active_acquire(struct intel_context *ce)
{
int err;
err = i915_active_acquire(&ce->active);
if (err)
return err;
/* Preallocate tracking nodes */
if (!intel_context_is_barrier(ce)) {
err = i915_active_acquire_preallocate_barrier(&ce->active,
ce->engine);
if (err) {
i915_active_release(&ce->active);
return err;
}
}
return 0;
}
static 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);
}
int __intel_context_do_pin(struct intel_context *ce)
{
int err;
if (unlikely(!test_bit(CONTEXT_ALLOC_BIT, &ce->flags))) {
err = intel_context_alloc_state(ce);
if (err)
return err;
}
if (mutex_lock_interruptible(&ce->pin_mutex))
return -EINTR;
if (likely(!atomic_read(&ce->pin_count))) {
err = intel_context_active_acquire(ce);
if (unlikely(err))
goto err;
err = ce->ops->pin(ce);
if (unlikely(err))
goto err_active;
CE_TRACE(ce, "pin ring:{head:%04x, tail:%04x}\n",
ce->ring->head, ce->ring->tail);
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_active:
intel_context_active_release(ce);
err:
mutex_unlock(&ce->pin_mutex);
return err;
}
void intel_context_unpin(struct intel_context *ce)
{
if (!atomic_dec_and_test(&ce->pin_count))
return;
CE_TRACE(ce, "unpin\n");
ce->ops->unpin(ce);
/*
* Once released, we may asynchronously drop the active reference.
* As that may be the only reference keeping the context alive,
* take an extra now so that it is not freed before we finish
* dereferencing it.
*/
intel_context_get(ce);
intel_context_active_release(ce);
intel_context_put(ce);
}
static int __context_pin_state(struct i915_vma *vma)
{
unsigned int bias = i915_ggtt_pin_bias(vma) | PIN_OFFSET_BIAS;
int err;
err = i915_ggtt_pin(vma, 0, bias | PIN_HIGH);
if (err)
return err;
err = i915_active_acquire(&vma->active);
if (err)
goto err_unpin;
/*
* And mark it as a globally pinned object to let the shrinker know
* it cannot reclaim the object until we release it.
*/
i915_vma_make_unshrinkable(vma);
vma->obj->mm.dirty = true;
return 0;
err_unpin:
i915_vma_unpin(vma);
return err;
}
static void __context_unpin_state(struct i915_vma *vma)
{
i915_vma_make_shrinkable(vma);
i915_active_release(&vma->active);
__i915_vma_unpin(vma);
}
__i915_active_call
static void __intel_context_retire(struct i915_active *active)
{
struct intel_context *ce = container_of(active, typeof(*ce), active);
CE_TRACE(ce, "retire\n");
set_bit(CONTEXT_VALID_BIT, &ce->flags);
if (ce->state)
__context_unpin_state(ce->state);
intel_timeline_unpin(ce->timeline);
intel_ring_unpin(ce->ring);
intel_context_put(ce);
}
static int __intel_context_active(struct i915_active *active)
{
struct intel_context *ce = container_of(active, typeof(*ce), active);
int err;
CE_TRACE(ce, "active\n");
intel_context_get(ce);
err = intel_ring_pin(ce->ring);
if (err)
goto err_put;
err = intel_timeline_pin(ce->timeline);
if (err)
goto err_ring;
if (!ce->state)
return 0;
err = __context_pin_state(ce->state);
if (err)
goto err_timeline;
return 0;
err_timeline:
intel_timeline_unpin(ce->timeline);
err_ring:
intel_ring_unpin(ce->ring);
err_put:
intel_context_put(ce);
return err;
}
void
intel_context_init(struct intel_context *ce,
struct intel_engine_cs *engine)
{
GEM_BUG_ON(!engine->cops);
GEM_BUG_ON(!engine->gt->vm);
kref_init(&ce->ref);
ce->engine = engine;
ce->ops = engine->cops;
ce->sseu = engine->sseu;
ce->ring = __intel_context_ring_size(SZ_4K);
ce->vm = i915_vm_get(engine->gt->vm);
INIT_LIST_HEAD(&ce->signal_link);
INIT_LIST_HEAD(&ce->signals);
mutex_init(&ce->pin_mutex);
i915_active_init(&ce->active,
__intel_context_active, __intel_context_retire);
}
void intel_context_fini(struct intel_context *ce)
{
if (ce->timeline)
intel_timeline_put(ce->timeline);
i915_vm_put(ce->vm);
mutex_destroy(&ce->pin_mutex);
i915_active_fini(&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);
intel_timeline_enter(ce->timeline);
}
void intel_context_exit_engine(struct intel_context *ce)
{
intel_timeline_exit(ce->timeline);
intel_engine_pm_put(ce->engine);
}
int intel_context_prepare_remote_request(struct intel_context *ce,
struct i915_request *rq)
{
struct intel_timeline *tl = ce->timeline;
int err;
/* Only suitable for use in remotely modifying this context */
GEM_BUG_ON(rq->context == ce);
if (rcu_access_pointer(rq->timeline) != tl) { /* timeline sharing! */
/* Queue this switch after current activity by this context. */
err = i915_active_fence_set(&tl->last_request, rq);
if (err)
return err;
}
/*
* Guarantee context image and the timeline remains pinned until the
* modifying request is retired by setting the ce activity tracker.
*
* But we only need to take one pin on the account of it. Or in other
* words transfer the pinned ce object to tracked active request.
*/
GEM_BUG_ON(i915_active_is_idle(&ce->active));
return i915_active_add_request(&ce->active, rq);
}
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;
}
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftest_context.c"
#endif