1 files changed, 280 insertions, 0 deletions

diff --git a/drivers/gpu/drm/xe/xe_sched_job.c b/drivers/gpu/drm/xe/xe_sched_job.c
new file mode 100644
index 000000000000..01106a1156ad
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_sched_job.c
@@ -0,0 +1,280 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2021 Intel Corporation
+ */
+
+#include "xe_sched_job.h"
+
+#include <linux/dma-fence-array.h>
+#include <linux/slab.h>
+
+#include "xe_device.h"
+#include "xe_exec_queue.h"
+#include "xe_gt.h"
+#include "xe_hw_engine_types.h"
+#include "xe_hw_fence.h"
+#include "xe_lrc.h"
+#include "xe_macros.h"
+#include "xe_trace.h"
+#include "xe_vm.h"
+
+static struct kmem_cache *xe_sched_job_slab;
+static struct kmem_cache *xe_sched_job_parallel_slab;
+
+int __init xe_sched_job_module_init(void)
+{
+	xe_sched_job_slab =
+		kmem_cache_create("xe_sched_job",
+				  sizeof(struct xe_sched_job) +
+				  sizeof(u64), 0,
+				  SLAB_HWCACHE_ALIGN, NULL);
+	if (!xe_sched_job_slab)
+		return -ENOMEM;
+
+	xe_sched_job_parallel_slab =
+		kmem_cache_create("xe_sched_job_parallel",
+				  sizeof(struct xe_sched_job) +
+				  sizeof(u64) *
+				  XE_HW_ENGINE_MAX_INSTANCE, 0,
+				  SLAB_HWCACHE_ALIGN, NULL);
+	if (!xe_sched_job_parallel_slab) {
+		kmem_cache_destroy(xe_sched_job_slab);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+void xe_sched_job_module_exit(void)
+{
+	kmem_cache_destroy(xe_sched_job_slab);
+	kmem_cache_destroy(xe_sched_job_parallel_slab);
+}
+
+static struct xe_sched_job *job_alloc(bool parallel)
+{
+	return kmem_cache_zalloc(parallel ? xe_sched_job_parallel_slab :
+				 xe_sched_job_slab, GFP_KERNEL);
+}
+
+bool xe_sched_job_is_migration(struct xe_exec_queue *q)
+{
+	return q->vm && (q->vm->flags & XE_VM_FLAG_MIGRATION);
+}
+
+static void job_free(struct xe_sched_job *job)
+{
+	struct xe_exec_queue *q = job->q;
+	bool is_migration = xe_sched_job_is_migration(q);
+
+	kmem_cache_free(xe_exec_queue_is_parallel(job->q) || is_migration ?
+			xe_sched_job_parallel_slab : xe_sched_job_slab, job);
+}
+
+static struct xe_device *job_to_xe(struct xe_sched_job *job)
+{
+	return gt_to_xe(job->q->gt);
+}
+
+struct xe_sched_job *xe_sched_job_create(struct xe_exec_queue *q,
+					 u64 *batch_addr)
+{
+	struct xe_sched_job *job;
+	struct dma_fence **fences;
+	bool is_migration = xe_sched_job_is_migration(q);
+	int err;
+	int i, j;
+	u32 width;
+
+	/* only a kernel context can submit a vm-less job */
+	XE_WARN_ON(!q->vm && !(q->flags & EXEC_QUEUE_FLAG_KERNEL));
+
+	/* Migration and kernel engines have their own locking */
+	if (!(q->flags & (EXEC_QUEUE_FLAG_KERNEL | EXEC_QUEUE_FLAG_VM))) {
+		lockdep_assert_held(&q->vm->lock);
+		if (!xe_vm_in_lr_mode(q->vm))
+			xe_vm_assert_held(q->vm);
+	}
+
+	job = job_alloc(xe_exec_queue_is_parallel(q) || is_migration);
+	if (!job)
+		return ERR_PTR(-ENOMEM);
+
+	job->q = q;
+	kref_init(&job->refcount);
+	xe_exec_queue_get(job->q);
+
+	err = drm_sched_job_init(&job->drm, q->entity, 1, NULL);
+	if (err)
+		goto err_free;
+
+	if (!xe_exec_queue_is_parallel(q)) {
+		job->fence = xe_lrc_create_seqno_fence(q->lrc);
+		if (IS_ERR(job->fence)) {
+			err = PTR_ERR(job->fence);
+			goto err_sched_job;
+		}
+	} else {
+		struct dma_fence_array *cf;
+
+		fences = kmalloc_array(q->width, sizeof(*fences), GFP_KERNEL);
+		if (!fences) {
+			err = -ENOMEM;
+			goto err_sched_job;
+		}
+
+		for (j = 0; j < q->width; ++j) {
+			fences[j] = xe_lrc_create_seqno_fence(q->lrc + j);
+			if (IS_ERR(fences[j])) {
+				err = PTR_ERR(fences[j]);
+				goto err_fences;
+			}
+		}
+
+		cf = dma_fence_array_create(q->width, fences,
+					    q->parallel.composite_fence_ctx,
+					    q->parallel.composite_fence_seqno++,
+					    false);
+		if (!cf) {
+			--q->parallel.composite_fence_seqno;
+			err = -ENOMEM;
+			goto err_fences;
+		}
+
+		/* Sanity check */
+		for (j = 0; j < q->width; ++j)
+			xe_assert(job_to_xe(job), cf->base.seqno == fences[j]->seqno);
+
+		job->fence = &cf->base;
+	}
+
+	width = q->width;
+	if (is_migration)
+		width = 2;
+
+	for (i = 0; i < width; ++i)
+		job->batch_addr[i] = batch_addr[i];
+
+	/* All other jobs require a VM to be open which has a ref */
+	if (unlikely(q->flags & EXEC_QUEUE_FLAG_KERNEL))
+		xe_device_mem_access_get(job_to_xe(job));
+	xe_device_assert_mem_access(job_to_xe(job));
+
+	trace_xe_sched_job_create(job);
+	return job;
+
+err_fences:
+	for (j = j - 1; j >= 0; --j) {
+		--q->lrc[j].fence_ctx.next_seqno;
+		dma_fence_put(fences[j]);
+	}
+	kfree(fences);
+err_sched_job:
+	drm_sched_job_cleanup(&job->drm);
+err_free:
+	xe_exec_queue_put(q);
+	job_free(job);
+	return ERR_PTR(err);
+}
+
+/**
+ * xe_sched_job_destroy - Destroy XE schedule job
+ * @ref: reference to XE schedule job
+ *
+ * Called when ref == 0, drop a reference to job's xe_engine + fence, cleanup
+ * base DRM schedule job, and free memory for XE schedule job.
+ */
+void xe_sched_job_destroy(struct kref *ref)
+{
+	struct xe_sched_job *job =
+		container_of(ref, struct xe_sched_job, refcount);
+
+	if (unlikely(job->q->flags & EXEC_QUEUE_FLAG_KERNEL))
+		xe_device_mem_access_put(job_to_xe(job));
+	xe_exec_queue_put(job->q);
+	dma_fence_put(job->fence);
+	drm_sched_job_cleanup(&job->drm);
+	job_free(job);
+}
+
+void xe_sched_job_set_error(struct xe_sched_job *job, int error)
+{
+	if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &job->fence->flags))
+		return;
+
+	dma_fence_set_error(job->fence, error);
+
+	if (dma_fence_is_array(job->fence)) {
+		struct dma_fence_array *array =
+			to_dma_fence_array(job->fence);
+		struct dma_fence **child = array->fences;
+		unsigned int nchild = array->num_fences;
+
+		do {
+			struct dma_fence *current_fence = *child++;
+
+			if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
+				     &current_fence->flags))
+				continue;
+			dma_fence_set_error(current_fence, error);
+		} while (--nchild);
+	}
+
+	trace_xe_sched_job_set_error(job);
+
+	dma_fence_enable_sw_signaling(job->fence);
+	xe_hw_fence_irq_run(job->q->fence_irq);
+}
+
+bool xe_sched_job_started(struct xe_sched_job *job)
+{
+	struct xe_lrc *lrc = job->q->lrc;
+
+	return !__dma_fence_is_later(xe_sched_job_seqno(job),
+				     xe_lrc_start_seqno(lrc),
+				     job->fence->ops);
+}
+
+bool xe_sched_job_completed(struct xe_sched_job *job)
+{
+	struct xe_lrc *lrc = job->q->lrc;
+
+	/*
+	 * Can safely check just LRC[0] seqno as that is last seqno written when
+	 * parallel handshake is done.
+	 */
+
+	return !__dma_fence_is_later(xe_sched_job_seqno(job), xe_lrc_seqno(lrc),
+				     job->fence->ops);
+}
+
+void xe_sched_job_arm(struct xe_sched_job *job)
+{
+	drm_sched_job_arm(&job->drm);
+}
+
+void xe_sched_job_push(struct xe_sched_job *job)
+{
+	xe_sched_job_get(job);
+	trace_xe_sched_job_exec(job);
+	drm_sched_entity_push_job(&job->drm);
+	xe_sched_job_put(job);
+}
+
+/**
+ * xe_sched_job_last_fence_add_dep - Add last fence dependency to job
+ * @job:job to add the last fence dependency to
+ * @vm: virtual memory job belongs to
+ *
+ * Returns:
+ * 0 on success, or an error on failing to expand the array.
+ */
+int xe_sched_job_last_fence_add_dep(struct xe_sched_job *job, struct xe_vm *vm)
+{
+	struct dma_fence *fence;
+
+	fence = xe_exec_queue_last_fence_get(job->q, vm);
+	dma_fence_get(fence);
+
+	return drm_sched_job_add_dependency(&job->drm, fence);
+}