rcu_read_unlock();
}
+static inline int new_hw_id(struct drm_i915_private *i915, gfp_t gfp)
+{
+ unsigned int max;
+
+ lockdep_assert_held(&i915->contexts.mutex);
+
+ if (INTEL_GEN(i915) >= 11)
+ max = GEN11_MAX_CONTEXT_HW_ID;
+ else if (USES_GUC_SUBMISSION(i915))
+ /*
+ * When using GuC in proxy submission, GuC consumes the
+ * highest bit in the context id to indicate proxy submission.
+ */
+ max = MAX_GUC_CONTEXT_HW_ID;
+ else
+ max = MAX_CONTEXT_HW_ID;
+
+ return ida_simple_get(&i915->contexts.hw_ida, 0, max, gfp);
+}
+
+static int steal_hw_id(struct drm_i915_private *i915)
+{
+ struct i915_gem_context *ctx, *cn;
+ LIST_HEAD(pinned);
+ int id = -ENOSPC;
+
+ lockdep_assert_held(&i915->contexts.mutex);
+
+ list_for_each_entry_safe(ctx, cn,
+ &i915->contexts.hw_id_list, hw_id_link) {
+ if (atomic_read(&ctx->hw_id_pin_count)) {
+ list_move_tail(&ctx->hw_id_link, &pinned);
+ continue;
+ }
+
+ GEM_BUG_ON(!ctx->hw_id); /* perma-pinned kernel context */
+ list_del_init(&ctx->hw_id_link);
+ id = ctx->hw_id;
+ break;
+ }
+
+ /*
+ * Remember how far we got up on the last repossesion scan, so the
+ * list is kept in a "least recently scanned" order.
+ */
+ list_splice_tail(&pinned, &i915->contexts.hw_id_list);
+ return id;
+}
+
+static int assign_hw_id(struct drm_i915_private *i915, unsigned int *out)
+{
+ int ret;
+
+ lockdep_assert_held(&i915->contexts.mutex);
+
+ /*
+ * We prefer to steal/stall ourselves and our users over that of the
+ * entire system. That may be a little unfair to our users, and
+ * even hurt high priority clients. The choice is whether to oomkill
+ * something else, or steal a context id.
+ */
+ ret = new_hw_id(i915, GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
+ if (unlikely(ret < 0)) {
+ ret = steal_hw_id(i915);
+ if (ret < 0) /* once again for the correct errno code */
+ ret = new_hw_id(i915, GFP_KERNEL);
+ if (ret < 0)
+ return ret;
+ }
+
+ *out = ret;
+ return 0;
+}
+
+static void release_hw_id(struct i915_gem_context *ctx)
+{
+ struct drm_i915_private *i915 = ctx->i915;
+
+ if (list_empty(&ctx->hw_id_link))
+ return;
+
+ mutex_lock(&i915->contexts.mutex);
+ if (!list_empty(&ctx->hw_id_link)) {
+ ida_simple_remove(&i915->contexts.hw_ida, ctx->hw_id);
+ list_del_init(&ctx->hw_id_link);
+ }
+ mutex_unlock(&i915->contexts.mutex);
+}
+
static void i915_gem_context_free(struct i915_gem_context *ctx)
{
unsigned int n;
lockdep_assert_held(&ctx->i915->drm.struct_mutex);
GEM_BUG_ON(!i915_gem_context_is_closed(ctx));
+ release_hw_id(ctx);
i915_ppgtt_put(ctx->ppgtt);
for (n = 0; n < ARRAY_SIZE(ctx->__engine); n++) {
struct intel_context *ce = &ctx->__engine[n];
- if (!ce->state)
- continue;
-
- WARN_ON(ce->pin_count);
- if (ce->ring)
- intel_ring_free(ce->ring);
-
- __i915_gem_object_release_unless_active(ce->state->obj);
+ if (ce->ops)
+ ce->ops->destroy(ce);
}
kfree(ctx->name);
list_del(&ctx->link);
- ida_simple_remove(&ctx->i915->contexts.hw_ida, ctx->hw_id);
kfree_rcu(ctx, rcu);
}
i915_gem_context_set_closed(ctx);
/*
+ * This context will never again be assinged to HW, so we can
+ * reuse its ID for the next context.
+ */
+ release_hw_id(ctx);
+
+ /*
* The LUT uses the VMA as a backpointer to unref the object,
* so we need to clear the LUT before we close all the VMA (inside
* the ppgtt).
*/
lut_close(ctx);
if (ctx->ppgtt)
- i915_ppgtt_close(&ctx->ppgtt->base);
+ i915_ppgtt_close(&ctx->ppgtt->vm);
ctx->file_priv = ERR_PTR(-EBADF);
i915_gem_context_put(ctx);
}
-static int assign_hw_id(struct drm_i915_private *dev_priv, unsigned *out)
-{
- int ret;
- unsigned int max;
-
- if (INTEL_GEN(dev_priv) >= 11)
- max = GEN11_MAX_CONTEXT_HW_ID;
- else
- max = MAX_CONTEXT_HW_ID;
-
- ret = ida_simple_get(&dev_priv->contexts.hw_ida,
- 0, max, GFP_KERNEL);
- if (ret < 0) {
- /* Contexts are only released when no longer active.
- * Flush any pending retires to hopefully release some
- * stale contexts and try again.
- */
- i915_retire_requests(dev_priv);
- ret = ida_simple_get(&dev_priv->contexts.hw_ida,
- 0, max, GFP_KERNEL);
- if (ret < 0)
- return ret;
- }
-
- *out = ret;
- return 0;
-}
-
static u32 default_desc_template(const struct drm_i915_private *i915,
const struct i915_hw_ppgtt *ppgtt)
{
desc = GEN8_CTX_VALID | GEN8_CTX_PRIVILEGE;
address_mode = INTEL_LEGACY_32B_CONTEXT;
- if (ppgtt && i915_vm_is_48bit(&ppgtt->base))
+ if (ppgtt && i915_vm_is_48bit(&ppgtt->vm))
address_mode = INTEL_LEGACY_64B_CONTEXT;
desc |= address_mode << GEN8_CTX_ADDRESSING_MODE_SHIFT;
struct drm_i915_file_private *file_priv)
{
struct i915_gem_context *ctx;
+ unsigned int n;
int ret;
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (ctx == NULL)
return ERR_PTR(-ENOMEM);
- ret = assign_hw_id(dev_priv, &ctx->hw_id);
- if (ret) {
- kfree(ctx);
- return ERR_PTR(ret);
- }
-
kref_init(&ctx->ref);
list_add_tail(&ctx->link, &dev_priv->contexts.list);
ctx->i915 = dev_priv;
ctx->sched.priority = I915_PRIORITY_NORMAL;
+ for (n = 0; n < ARRAY_SIZE(ctx->__engine); n++) {
+ struct intel_context *ce = &ctx->__engine[n];
+
+ ce->gem_context = ctx;
+ }
+
INIT_RADIX_TREE(&ctx->handles_vma, GFP_KERNEL);
INIT_LIST_HEAD(&ctx->handles_list);
+ INIT_LIST_HEAD(&ctx->hw_id_link);
/* Default context will never have a file_priv */
ret = DEFAULT_CONTEXT_HANDLE;
ctx->desc_template =
default_desc_template(dev_priv, dev_priv->mm.aliasing_ppgtt);
- /*
- * GuC requires the ring to be placed in Non-WOPCM memory. If GuC is not
- * present or not in use we still need a small bias as ring wraparound
- * at offset 0 sometimes hangs. No idea why.
- */
- if (USES_GUC(dev_priv))
- ctx->ggtt_offset_bias = dev_priv->guc.ggtt_pin_bias;
- else
- ctx->ggtt_offset_bias = I915_GTT_PAGE_SIZE;
-
return ctx;
err_pid:
if (USES_FULL_PPGTT(dev_priv)) {
struct i915_hw_ppgtt *ppgtt;
- ppgtt = i915_ppgtt_create(dev_priv, file_priv, ctx->name);
+ ppgtt = i915_ppgtt_create(dev_priv, file_priv);
if (IS_ERR(ppgtt)) {
DRM_DEBUG_DRIVER("PPGTT setup failed (%ld)\n",
PTR_ERR(ppgtt));
return ctx;
}
+static void
+destroy_kernel_context(struct i915_gem_context **ctxp)
+{
+ struct i915_gem_context *ctx;
+
+ /* Keep the context ref so that we can free it immediately ourselves */
+ ctx = i915_gem_context_get(fetch_and_zero(ctxp));
+ GEM_BUG_ON(!i915_gem_context_is_kernel(ctx));
+
+ context_close(ctx);
+ i915_gem_context_free(ctx);
+}
+
struct i915_gem_context *
i915_gem_context_create_kernel(struct drm_i915_private *i915, int prio)
{
struct i915_gem_context *ctx;
+ int err;
ctx = i915_gem_create_context(i915, NULL);
if (IS_ERR(ctx))
return ctx;
+ err = i915_gem_context_pin_hw_id(ctx);
+ if (err) {
+ destroy_kernel_context(&ctx);
+ return ERR_PTR(err);
+ }
+
i915_gem_context_clear_bannable(ctx);
ctx->sched.priority = prio;
ctx->ring_size = PAGE_SIZE;
return ctx;
}
-static void
-destroy_kernel_context(struct i915_gem_context **ctxp)
+static void init_contexts(struct drm_i915_private *i915)
{
- struct i915_gem_context *ctx;
+ mutex_init(&i915->contexts.mutex);
+ INIT_LIST_HEAD(&i915->contexts.list);
- /* Keep the context ref so that we can free it immediately ourselves */
- ctx = i915_gem_context_get(fetch_and_zero(ctxp));
- GEM_BUG_ON(!i915_gem_context_is_kernel(ctx));
+ /* Using the simple ida interface, the max is limited by sizeof(int) */
+ BUILD_BUG_ON(MAX_CONTEXT_HW_ID > INT_MAX);
+ BUILD_BUG_ON(GEN11_MAX_CONTEXT_HW_ID > INT_MAX);
+ ida_init(&i915->contexts.hw_ida);
+ INIT_LIST_HEAD(&i915->contexts.hw_id_list);
- context_close(ctx);
- i915_gem_context_free(ctx);
+ INIT_WORK(&i915->contexts.free_work, contexts_free_worker);
+ init_llist_head(&i915->contexts.free_list);
}
static bool needs_preempt_context(struct drm_i915_private *i915)
if (ret)
return ret;
- INIT_LIST_HEAD(&dev_priv->contexts.list);
- INIT_WORK(&dev_priv->contexts.free_work, contexts_free_worker);
- init_llist_head(&dev_priv->contexts.free_list);
-
- /* Using the simple ida interface, the max is limited by sizeof(int) */
- BUILD_BUG_ON(MAX_CONTEXT_HW_ID > INT_MAX);
- BUILD_BUG_ON(GEN11_MAX_CONTEXT_HW_ID > INT_MAX);
- ida_init(&dev_priv->contexts.hw_ida);
+ init_contexts(dev_priv);
/* lowest priority; idle task */
ctx = i915_gem_context_create_kernel(dev_priv, I915_PRIORITY_MIN);
}
/*
* For easy recognisablity, we want the kernel context to be 0 and then
- * all user contexts will have non-zero hw_id.
+ * all user contexts will have non-zero hw_id. Kernel contexts are
+ * permanently pinned, so that we never suffer a stall and can
+ * use them from any allocation context (e.g. for evicting other
+ * contexts and from inside the shrinker).
*/
GEM_BUG_ON(ctx->hw_id);
+ GEM_BUG_ON(!atomic_read(&ctx->hw_id_pin_count));
dev_priv->kernel_context = ctx;
/* highest priority; preempting task */
}
DRM_DEBUG_DRIVER("%s context support initialized\n",
- dev_priv->engine[RCS]->context_size ? "logical" :
- "fake");
+ DRIVER_CAPS(dev_priv)->has_logical_contexts ?
+ "logical" : "fake");
return 0;
}
lockdep_assert_held(&dev_priv->drm.struct_mutex);
- for_each_engine(engine, dev_priv, id) {
- engine->legacy_active_context = NULL;
- engine->legacy_active_ppgtt = NULL;
-
- if (!engine->last_retired_context)
- continue;
-
- intel_context_unpin(engine->last_retired_context, engine);
- engine->last_retired_context = NULL;
- }
+ for_each_engine(engine, dev_priv, id)
+ intel_engine_lost_context(engine);
}
void i915_gem_contexts_fini(struct drm_i915_private *i915)
destroy_kernel_context(&i915->kernel_context);
/* Must free all deferred contexts (via flush_workqueue) first */
+ GEM_BUG_ON(!list_empty(&i915->contexts.hw_id_list));
ida_destroy(&i915->contexts.hw_ida);
}
{
struct i915_request *rq;
- if (timeline == &engine->timeline)
- return NULL;
+ GEM_BUG_ON(timeline == &engine->timeline);
rq = i915_gem_active_raw(&timeline->last_request,
&engine->i915->drm.struct_mutex);
- if (rq && rq->engine == engine)
+ if (rq && rq->engine == engine) {
+ GEM_TRACE("last request for %s on engine %s: %llx:%d\n",
+ timeline->name, engine->name,
+ rq->fence.context, rq->fence.seqno);
+ GEM_BUG_ON(rq->timeline != timeline);
return rq;
+ }
return NULL;
}
-static bool engine_has_idle_kernel_context(struct intel_engine_cs *engine)
+static bool engine_has_kernel_context_barrier(struct intel_engine_cs *engine)
{
- struct i915_timeline *timeline;
+ struct drm_i915_private *i915 = engine->i915;
+ const struct intel_context * const ce =
+ to_intel_context(i915->kernel_context, engine);
+ struct i915_timeline *barrier = ce->ring->timeline;
+ struct intel_ring *ring;
+ bool any_active = false;
+
+ lockdep_assert_held(&i915->drm.struct_mutex);
+ list_for_each_entry(ring, &i915->gt.active_rings, active_link) {
+ struct i915_request *rq;
+
+ rq = last_request_on_engine(ring->timeline, engine);
+ if (!rq)
+ continue;
- list_for_each_entry(timeline, &engine->i915->gt.timelines, link) {
- if (last_request_on_engine(timeline, engine))
+ any_active = true;
+
+ if (rq->hw_context == ce)
+ continue;
+
+ /*
+ * Was this request submitted after the previous
+ * switch-to-kernel-context?
+ */
+ if (!i915_timeline_sync_is_later(barrier, &rq->fence)) {
+ GEM_TRACE("%s needs barrier for %llx:%d\n",
+ ring->timeline->name,
+ rq->fence.context,
+ rq->fence.seqno);
return false;
+ }
+
+ GEM_TRACE("%s has barrier after %llx:%d\n",
+ ring->timeline->name,
+ rq->fence.context,
+ rq->fence.seqno);
}
- return intel_engine_has_kernel_context(engine);
+ /*
+ * If any other timeline was still active and behind the last barrier,
+ * then our last switch-to-kernel-context must still be queued and
+ * will run last (leaving the engine in the kernel context when it
+ * eventually idles).
+ */
+ if (any_active)
+ return true;
+
+ /* The engine is idle; check that it is idling in the kernel context. */
+ return engine->last_retired_context == ce;
}
-int i915_gem_switch_to_kernel_context(struct drm_i915_private *dev_priv)
+int i915_gem_switch_to_kernel_context(struct drm_i915_private *i915)
{
struct intel_engine_cs *engine;
- struct i915_timeline *timeline;
enum intel_engine_id id;
- lockdep_assert_held(&dev_priv->drm.struct_mutex);
+ GEM_TRACE("awake?=%s\n", yesno(i915->gt.awake));
- i915_retire_requests(dev_priv);
+ lockdep_assert_held(&i915->drm.struct_mutex);
+ GEM_BUG_ON(!i915->kernel_context);
- for_each_engine(engine, dev_priv, id) {
+ i915_retire_requests(i915);
+
+ for_each_engine(engine, i915, id) {
+ struct intel_ring *ring;
struct i915_request *rq;
- if (engine_has_idle_kernel_context(engine))
+ GEM_BUG_ON(!to_intel_context(i915->kernel_context, engine));
+ if (engine_has_kernel_context_barrier(engine))
continue;
- rq = i915_request_alloc(engine, dev_priv->kernel_context);
+ GEM_TRACE("emit barrier on %s\n", engine->name);
+
+ rq = i915_request_alloc(engine, i915->kernel_context);
if (IS_ERR(rq))
return PTR_ERR(rq);
/* Queue this switch after all other activity */
- list_for_each_entry(timeline, &dev_priv->gt.timelines, link) {
+ list_for_each_entry(ring, &i915->gt.active_rings, active_link) {
struct i915_request *prev;
- prev = last_request_on_engine(timeline, engine);
- if (prev)
- i915_sw_fence_await_sw_fence_gfp(&rq->submit,
- &prev->submit,
- I915_FENCE_GFP);
+ prev = last_request_on_engine(ring->timeline, engine);
+ if (!prev)
+ continue;
+
+ if (prev->gem_context == i915->kernel_context)
+ continue;
+
+ GEM_TRACE("add barrier on %s for %llx:%d\n",
+ engine->name,
+ prev->fence.context,
+ prev->fence.seqno);
+ i915_sw_fence_await_sw_fence_gfp(&rq->submit,
+ &prev->submit,
+ I915_FENCE_GFP);
+ i915_timeline_sync_set(rq->timeline, &prev->fence);
}
- /*
- * Force a flush after the switch to ensure that all rendering
- * and operations prior to switching to the kernel context hits
- * memory. This should be guaranteed by the previous request,
- * but an extra layer of paranoia before we declare the system
- * idle (on suspend etc) is advisable!
- */
- __i915_request_add(rq, true);
+ i915_request_add(rq);
}
return 0;
struct i915_gem_context *ctx;
int ret;
- if (!dev_priv->engine[RCS]->context_size)
+ if (!DRIVER_CAPS(dev_priv)->has_logical_contexts)
return -ENODEV;
if (args->pad != 0)
break;
case I915_CONTEXT_PARAM_GTT_SIZE:
if (ctx->ppgtt)
- args->value = ctx->ppgtt->base.total;
+ args->value = ctx->ppgtt->vm.total;
else if (to_i915(dev)->mm.aliasing_ppgtt)
- args->value = to_i915(dev)->mm.aliasing_ppgtt->base.total;
+ args->value = to_i915(dev)->mm.aliasing_ppgtt->vm.total;
else
- args->value = to_i915(dev)->ggtt.base.total;
+ args->value = to_i915(dev)->ggtt.vm.total;
break;
case I915_CONTEXT_PARAM_NO_ERROR_CAPTURE:
args->value = i915_gem_context_no_error_capture(ctx);
return ret;
}
+int __i915_gem_context_pin_hw_id(struct i915_gem_context *ctx)
+{
+ struct drm_i915_private *i915 = ctx->i915;
+ int err = 0;
+
+ mutex_lock(&i915->contexts.mutex);
+
+ GEM_BUG_ON(i915_gem_context_is_closed(ctx));
+
+ if (list_empty(&ctx->hw_id_link)) {
+ GEM_BUG_ON(atomic_read(&ctx->hw_id_pin_count));
+
+ err = assign_hw_id(i915, &ctx->hw_id);
+ if (err)
+ goto out_unlock;
+
+ list_add_tail(&ctx->hw_id_link, &i915->contexts.hw_id_list);
+ }
+
+ GEM_BUG_ON(atomic_read(&ctx->hw_id_pin_count) == ~0u);
+ atomic_inc(&ctx->hw_id_pin_count);
+
+out_unlock:
+ mutex_unlock(&i915->contexts.mutex);
+ return err;
+}
+
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftests/mock_context.c"
#include "selftests/i915_gem_context.c"
projects / platform / kernel / linux-rpi.git / blobdiff