Adding upstream version 6.8.9.upstream/6.8.9

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 786 insertions, 0 deletions

diff --git a/drivers/gpu/drm/imagination/pvr_job.c b/drivers/gpu/drm/imagination/pvr_job.c
new file mode 100644
index 0000000000..78c2f3c6dc
--- /dev/null
+++ b/drivers/gpu/drm/imagination/pvr_job.c
@@ -0,0 +1,786 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/* Copyright (c) 2023 Imagination Technologies Ltd. */
+
+#include "pvr_context.h"
+#include "pvr_device.h"
+#include "pvr_drv.h"
+#include "pvr_gem.h"
+#include "pvr_hwrt.h"
+#include "pvr_job.h"
+#include "pvr_mmu.h"
+#include "pvr_power.h"
+#include "pvr_rogue_fwif.h"
+#include "pvr_rogue_fwif_client.h"
+#include "pvr_stream.h"
+#include "pvr_stream_defs.h"
+#include "pvr_sync.h"
+
+#include <drm/drm_exec.h>
+#include <drm/drm_gem.h>
+#include <linux/types.h>
+#include <uapi/drm/pvr_drm.h>
+
+static void pvr_job_release(struct kref *kref)
+{
+	struct pvr_job *job = container_of(kref, struct pvr_job, ref_count);
+
+	xa_erase(&job->pvr_dev->job_ids, job->id);
+
+	pvr_hwrt_data_put(job->hwrt);
+	pvr_context_put(job->ctx);
+
+	WARN_ON(job->paired_job);
+
+	pvr_queue_job_cleanup(job);
+	pvr_job_release_pm_ref(job);
+
+	kfree(job->cmd);
+	kfree(job);
+}
+
+/**
+ * pvr_job_put() - Release reference on job
+ * @job: Target job.
+ */
+void
+pvr_job_put(struct pvr_job *job)
+{
+	if (job)
+		kref_put(&job->ref_count, pvr_job_release);
+}
+
+/**
+ * pvr_job_process_stream() - Build job FW structure from stream
+ * @pvr_dev: Device pointer.
+ * @cmd_defs: Stream definition.
+ * @stream: Pointer to command stream.
+ * @stream_size: Size of command stream, in bytes.
+ * @job: Pointer to job.
+ *
+ * Caller is responsible for freeing the output structure.
+ *
+ * Returns:
+ *  * 0 on success,
+ *  * -%ENOMEM on out of memory, or
+ *  * -%EINVAL on malformed stream.
+ */
+static int
+pvr_job_process_stream(struct pvr_device *pvr_dev, const struct pvr_stream_cmd_defs *cmd_defs,
+		       void *stream, u32 stream_size, struct pvr_job *job)
+{
+	int err;
+
+	job->cmd = kzalloc(cmd_defs->dest_size, GFP_KERNEL);
+	if (!job->cmd)
+		return -ENOMEM;
+
+	job->cmd_len = cmd_defs->dest_size;
+
+	err = pvr_stream_process(pvr_dev, cmd_defs, stream, stream_size, job->cmd);
+	if (err)
+		kfree(job->cmd);
+
+	return err;
+}
+
+static int pvr_fw_cmd_init(struct pvr_device *pvr_dev, struct pvr_job *job,
+			   const struct pvr_stream_cmd_defs *stream_def,
+			   u64 stream_userptr, u32 stream_len)
+{
+	void *stream;
+	int err;
+
+	stream = kzalloc(stream_len, GFP_KERNEL);
+	if (!stream)
+		return -ENOMEM;
+
+	if (copy_from_user(stream, u64_to_user_ptr(stream_userptr), stream_len)) {
+		err = -EFAULT;
+		goto err_free_stream;
+	}
+
+	err = pvr_job_process_stream(pvr_dev, stream_def, stream, stream_len, job);
+
+err_free_stream:
+	kfree(stream);
+
+	return err;
+}
+
+static u32
+convert_geom_flags(u32 in_flags)
+{
+	u32 out_flags = 0;
+
+	if (in_flags & DRM_PVR_SUBMIT_JOB_GEOM_CMD_FIRST)
+		out_flags |= ROGUE_GEOM_FLAGS_FIRSTKICK;
+	if (in_flags & DRM_PVR_SUBMIT_JOB_GEOM_CMD_LAST)
+		out_flags |= ROGUE_GEOM_FLAGS_LASTKICK;
+	if (in_flags & DRM_PVR_SUBMIT_JOB_GEOM_CMD_SINGLE_CORE)
+		out_flags |= ROGUE_GEOM_FLAGS_SINGLE_CORE;
+
+	return out_flags;
+}
+
+static u32
+convert_frag_flags(u32 in_flags)
+{
+	u32 out_flags = 0;
+
+	if (in_flags & DRM_PVR_SUBMIT_JOB_FRAG_CMD_SINGLE_CORE)
+		out_flags |= ROGUE_FRAG_FLAGS_SINGLE_CORE;
+	if (in_flags & DRM_PVR_SUBMIT_JOB_FRAG_CMD_DEPTHBUFFER)
+		out_flags |= ROGUE_FRAG_FLAGS_DEPTHBUFFER;
+	if (in_flags & DRM_PVR_SUBMIT_JOB_FRAG_CMD_STENCILBUFFER)
+		out_flags |= ROGUE_FRAG_FLAGS_STENCILBUFFER;
+	if (in_flags & DRM_PVR_SUBMIT_JOB_FRAG_CMD_PREVENT_CDM_OVERLAP)
+		out_flags |= ROGUE_FRAG_FLAGS_PREVENT_CDM_OVERLAP;
+	if (in_flags & DRM_PVR_SUBMIT_JOB_FRAG_CMD_SCRATCHBUFFER)
+		out_flags |= ROGUE_FRAG_FLAGS_SCRATCHBUFFER;
+	if (in_flags & DRM_PVR_SUBMIT_JOB_FRAG_CMD_GET_VIS_RESULTS)
+		out_flags |= ROGUE_FRAG_FLAGS_GET_VIS_RESULTS;
+	if (in_flags & DRM_PVR_SUBMIT_JOB_FRAG_CMD_DISABLE_PIXELMERGE)
+		out_flags |= ROGUE_FRAG_FLAGS_DISABLE_PIXELMERGE;
+
+	return out_flags;
+}
+
+static int
+pvr_geom_job_fw_cmd_init(struct pvr_job *job,
+			 struct drm_pvr_job *args)
+{
+	struct rogue_fwif_cmd_geom *cmd;
+	int err;
+
+	if (args->flags & ~DRM_PVR_SUBMIT_JOB_GEOM_CMD_FLAGS_MASK)
+		return -EINVAL;
+
+	if (job->ctx->type != DRM_PVR_CTX_TYPE_RENDER)
+		return -EINVAL;
+
+	if (!job->hwrt)
+		return -EINVAL;
+
+	job->fw_ccb_cmd_type = ROGUE_FWIF_CCB_CMD_TYPE_GEOM;
+	err = pvr_fw_cmd_init(job->pvr_dev, job, &pvr_cmd_geom_stream,
+			      args->cmd_stream, args->cmd_stream_len);
+	if (err)
+		return err;
+
+	cmd = job->cmd;
+	cmd->cmd_shared.cmn.frame_num = 0;
+	cmd->flags = convert_geom_flags(args->flags);
+	pvr_fw_object_get_fw_addr(job->hwrt->fw_obj, &cmd->cmd_shared.hwrt_data_fw_addr);
+	return 0;
+}
+
+static int
+pvr_frag_job_fw_cmd_init(struct pvr_job *job,
+			 struct drm_pvr_job *args)
+{
+	struct rogue_fwif_cmd_frag *cmd;
+	int err;
+
+	if (args->flags & ~DRM_PVR_SUBMIT_JOB_FRAG_CMD_FLAGS_MASK)
+		return -EINVAL;
+
+	if (job->ctx->type != DRM_PVR_CTX_TYPE_RENDER)
+		return -EINVAL;
+
+	if (!job->hwrt)
+		return -EINVAL;
+
+	job->fw_ccb_cmd_type = (args->flags & DRM_PVR_SUBMIT_JOB_FRAG_CMD_PARTIAL_RENDER) ?
+			       ROGUE_FWIF_CCB_CMD_TYPE_FRAG_PR :
+			       ROGUE_FWIF_CCB_CMD_TYPE_FRAG;
+	err = pvr_fw_cmd_init(job->pvr_dev, job, &pvr_cmd_frag_stream,
+			      args->cmd_stream, args->cmd_stream_len);
+	if (err)
+		return err;
+
+	cmd = job->cmd;
+	cmd->cmd_shared.cmn.frame_num = 0;
+	cmd->flags = convert_frag_flags(args->flags);
+	pvr_fw_object_get_fw_addr(job->hwrt->fw_obj, &cmd->cmd_shared.hwrt_data_fw_addr);
+	return 0;
+}
+
+static u32
+convert_compute_flags(u32 in_flags)
+{
+	u32 out_flags = 0;
+
+	if (in_flags & DRM_PVR_SUBMIT_JOB_COMPUTE_CMD_PREVENT_ALL_OVERLAP)
+		out_flags |= ROGUE_COMPUTE_FLAG_PREVENT_ALL_OVERLAP;
+	if (in_flags & DRM_PVR_SUBMIT_JOB_COMPUTE_CMD_SINGLE_CORE)
+		out_flags |= ROGUE_COMPUTE_FLAG_SINGLE_CORE;
+
+	return out_flags;
+}
+
+static int
+pvr_compute_job_fw_cmd_init(struct pvr_job *job,
+			    struct drm_pvr_job *args)
+{
+	struct rogue_fwif_cmd_compute *cmd;
+	int err;
+
+	if (args->flags & ~DRM_PVR_SUBMIT_JOB_COMPUTE_CMD_FLAGS_MASK)
+		return -EINVAL;
+
+	if (job->ctx->type != DRM_PVR_CTX_TYPE_COMPUTE)
+		return -EINVAL;
+
+	job->fw_ccb_cmd_type = ROGUE_FWIF_CCB_CMD_TYPE_CDM;
+	err = pvr_fw_cmd_init(job->pvr_dev, job, &pvr_cmd_compute_stream,
+			      args->cmd_stream, args->cmd_stream_len);
+	if (err)
+		return err;
+
+	cmd = job->cmd;
+	cmd->common.frame_num = 0;
+	cmd->flags = convert_compute_flags(args->flags);
+	return 0;
+}
+
+static u32
+convert_transfer_flags(u32 in_flags)
+{
+	u32 out_flags = 0;
+
+	if (in_flags & DRM_PVR_SUBMIT_JOB_TRANSFER_CMD_SINGLE_CORE)
+		out_flags |= ROGUE_TRANSFER_FLAGS_SINGLE_CORE;
+
+	return out_flags;
+}
+
+static int
+pvr_transfer_job_fw_cmd_init(struct pvr_job *job,
+			     struct drm_pvr_job *args)
+{
+	struct rogue_fwif_cmd_transfer *cmd;
+	int err;
+
+	if (args->flags & ~DRM_PVR_SUBMIT_JOB_TRANSFER_CMD_FLAGS_MASK)
+		return -EINVAL;
+
+	if (job->ctx->type != DRM_PVR_CTX_TYPE_TRANSFER_FRAG)
+		return -EINVAL;
+
+	job->fw_ccb_cmd_type = ROGUE_FWIF_CCB_CMD_TYPE_TQ_3D;
+	err = pvr_fw_cmd_init(job->pvr_dev, job, &pvr_cmd_transfer_stream,
+			      args->cmd_stream, args->cmd_stream_len);
+	if (err)
+		return err;
+
+	cmd = job->cmd;
+	cmd->common.frame_num = 0;
+	cmd->flags = convert_transfer_flags(args->flags);
+	return 0;
+}
+
+static int
+pvr_job_fw_cmd_init(struct pvr_job *job,
+		    struct drm_pvr_job *args)
+{
+	switch (args->type) {
+	case DRM_PVR_JOB_TYPE_GEOMETRY:
+		return pvr_geom_job_fw_cmd_init(job, args);
+
+	case DRM_PVR_JOB_TYPE_FRAGMENT:
+		return pvr_frag_job_fw_cmd_init(job, args);
+
+	case DRM_PVR_JOB_TYPE_COMPUTE:
+		return pvr_compute_job_fw_cmd_init(job, args);
+
+	case DRM_PVR_JOB_TYPE_TRANSFER_FRAG:
+		return pvr_transfer_job_fw_cmd_init(job, args);
+
+	default:
+		return -EINVAL;
+	}
+}
+
+/**
+ * struct pvr_job_data - Helper container for pairing jobs with the
+ * sync_ops supplied for them by the user.
+ */
+struct pvr_job_data {
+	/** @job: Pointer to the job. */
+	struct pvr_job *job;
+
+	/** @sync_ops: Pointer to the sync_ops associated with @job. */
+	struct drm_pvr_sync_op *sync_ops;
+
+	/** @sync_op_count: Number of members of @sync_ops. */
+	u32 sync_op_count;
+};
+
+/**
+ * prepare_job_syncs() - Prepare all sync objects for a single job.
+ * @pvr_file: PowerVR file.
+ * @job_data: Precreated job and sync_ops array.
+ * @signal_array: xarray to receive signal sync objects.
+ *
+ * Returns:
+ *  * 0 on success, or
+ *  * Any error code returned by pvr_sync_signal_array_collect_ops(),
+ *    pvr_sync_add_deps_to_job(), drm_sched_job_add_resv_dependencies() or
+ *    pvr_sync_signal_array_update_fences().
+ */
+static int
+prepare_job_syncs(struct pvr_file *pvr_file,
+		  struct pvr_job_data *job_data,
+		  struct xarray *signal_array)
+{
+	struct dma_fence *done_fence;
+	int err = pvr_sync_signal_array_collect_ops(signal_array,
+						    from_pvr_file(pvr_file),
+						    job_data->sync_op_count,
+						    job_data->sync_ops);
+
+	if (err)
+		return err;
+
+	err = pvr_sync_add_deps_to_job(pvr_file, &job_data->job->base,
+				       job_data->sync_op_count,
+				       job_data->sync_ops, signal_array);
+	if (err)
+		return err;
+
+	if (job_data->job->hwrt) {
+		/* The geometry job writes the HWRT region headers, which are
+		 * then read by the fragment job.
+		 */
+		struct drm_gem_object *obj =
+			gem_from_pvr_gem(job_data->job->hwrt->fw_obj->gem);
+		enum dma_resv_usage usage =
+			dma_resv_usage_rw(job_data->job->type ==
+					  DRM_PVR_JOB_TYPE_GEOMETRY);
+
+		dma_resv_lock(obj->resv, NULL);
+		err = drm_sched_job_add_resv_dependencies(&job_data->job->base,
+							  obj->resv, usage);
+		dma_resv_unlock(obj->resv);
+		if (err)
+			return err;
+	}
+
+	/* We need to arm the job to get the job done fence. */
+	done_fence = pvr_queue_job_arm(job_data->job);
+
+	err = pvr_sync_signal_array_update_fences(signal_array,
+						  job_data->sync_op_count,
+						  job_data->sync_ops,
+						  done_fence);
+	return err;
+}
+
+/**
+ * prepare_job_syncs_for_each() - Prepare all sync objects for an array of jobs.
+ * @pvr_file: PowerVR file.
+ * @job_data: Array of precreated jobs and their sync_ops.
+ * @job_count: Number of jobs.
+ * @signal_array: xarray to receive signal sync objects.
+ *
+ * Returns:
+ *  * 0 on success, or
+ *  * Any error code returned by pvr_vm_bind_job_prepare_syncs().
+ */
+static int
+prepare_job_syncs_for_each(struct pvr_file *pvr_file,
+			   struct pvr_job_data *job_data,
+			   u32 *job_count,
+			   struct xarray *signal_array)
+{
+	for (u32 i = 0; i < *job_count; i++) {
+		int err = prepare_job_syncs(pvr_file, &job_data[i],
+					    signal_array);
+
+		if (err) {
+			*job_count = i;
+			return err;
+		}
+	}
+
+	return 0;
+}
+
+static struct pvr_job *
+create_job(struct pvr_device *pvr_dev,
+	   struct pvr_file *pvr_file,
+	   struct drm_pvr_job *args)
+{
+	struct pvr_job *job = NULL;
+	int err;
+
+	if (!args->cmd_stream || !args->cmd_stream_len)
+		return ERR_PTR(-EINVAL);
+
+	if (args->type != DRM_PVR_JOB_TYPE_GEOMETRY &&
+	    args->type != DRM_PVR_JOB_TYPE_FRAGMENT &&
+	    (args->hwrt.set_handle || args->hwrt.data_index))
+		return ERR_PTR(-EINVAL);
+
+	job = kzalloc(sizeof(*job), GFP_KERNEL);
+	if (!job)
+		return ERR_PTR(-ENOMEM);
+
+	kref_init(&job->ref_count);
+	job->type = args->type;
+	job->pvr_dev = pvr_dev;
+
+	err = xa_alloc(&pvr_dev->job_ids, &job->id, job, xa_limit_32b, GFP_KERNEL);
+	if (err)
+		goto err_put_job;
+
+	job->ctx = pvr_context_lookup(pvr_file, args->context_handle);
+	if (!job->ctx) {
+		err = -EINVAL;
+		goto err_put_job;
+	}
+
+	if (args->hwrt.set_handle) {
+		job->hwrt = pvr_hwrt_data_lookup(pvr_file, args->hwrt.set_handle,
+						 args->hwrt.data_index);
+		if (!job->hwrt) {
+			err = -EINVAL;
+			goto err_put_job;
+		}
+	}
+
+	err = pvr_job_fw_cmd_init(job, args);
+	if (err)
+		goto err_put_job;
+
+	err = pvr_queue_job_init(job);
+	if (err)
+		goto err_put_job;
+
+	return job;
+
+err_put_job:
+	pvr_job_put(job);
+	return ERR_PTR(err);
+}
+
+/**
+ * pvr_job_data_fini() - Cleanup all allocs used to set up job submission.
+ * @job_data: Job data array.
+ * @job_count: Number of members of @job_data.
+ */
+static void
+pvr_job_data_fini(struct pvr_job_data *job_data, u32 job_count)
+{
+	for (u32 i = 0; i < job_count; i++) {
+		pvr_job_put(job_data[i].job);
+		kvfree(job_data[i].sync_ops);
+	}
+}
+
+/**
+ * pvr_job_data_init() - Init an array of created jobs, associating them with
+ * the appropriate sync_ops args, which will be copied in.
+ * @pvr_dev: Target PowerVR device.
+ * @pvr_file: Pointer to PowerVR file structure.
+ * @job_args: Job args array copied from user.
+ * @job_count: Number of members of @job_args.
+ * @job_data_out: Job data array.
+ */
+static int pvr_job_data_init(struct pvr_device *pvr_dev,
+			     struct pvr_file *pvr_file,
+			     struct drm_pvr_job *job_args,
+			     u32 *job_count,
+			     struct pvr_job_data *job_data_out)
+{
+	int err = 0, i = 0;
+
+	for (; i < *job_count; i++) {
+		job_data_out[i].job =
+			create_job(pvr_dev, pvr_file, &job_args[i]);
+		err = PTR_ERR_OR_ZERO(job_data_out[i].job);
+
+		if (err) {
+			*job_count = i;
+			job_data_out[i].job = NULL;
+			goto err_cleanup;
+		}
+
+		err = PVR_UOBJ_GET_ARRAY(job_data_out[i].sync_ops,
+					 &job_args[i].sync_ops);
+		if (err) {
+			*job_count = i;
+
+			/* Ensure the job created above is also cleaned up. */
+			i++;
+			goto err_cleanup;
+		}
+
+		job_data_out[i].sync_op_count = job_args[i].sync_ops.count;
+	}
+
+	return 0;
+
+err_cleanup:
+	pvr_job_data_fini(job_data_out, i);
+
+	return err;
+}
+
+static void
+push_jobs(struct pvr_job_data *job_data, u32 job_count)
+{
+	for (u32 i = 0; i < job_count; i++)
+		pvr_queue_job_push(job_data[i].job);
+}
+
+static int
+prepare_fw_obj_resv(struct drm_exec *exec, struct pvr_fw_object *fw_obj)
+{
+	return drm_exec_prepare_obj(exec, gem_from_pvr_gem(fw_obj->gem), 1);
+}
+
+static int
+jobs_lock_all_objs(struct drm_exec *exec, struct pvr_job_data *job_data,
+		   u32 job_count)
+{
+	for (u32 i = 0; i < job_count; i++) {
+		struct pvr_job *job = job_data[i].job;
+
+		/* Grab a lock on a the context, to guard against
+		 * concurrent submission to the same queue.
+		 */
+		int err = drm_exec_lock_obj(exec,
+					    gem_from_pvr_gem(job->ctx->fw_obj->gem));
+
+		if (err)
+			return err;
+
+		if (job->hwrt) {
+			err = prepare_fw_obj_resv(exec,
+						  job->hwrt->fw_obj);
+			if (err)
+				return err;
+		}
+	}
+
+	return 0;
+}
+
+static int
+prepare_job_resvs_for_each(struct drm_exec *exec, struct pvr_job_data *job_data,
+			   u32 job_count)
+{
+	drm_exec_until_all_locked(exec) {
+		int err = jobs_lock_all_objs(exec, job_data, job_count);
+
+		drm_exec_retry_on_contention(exec);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+static void
+update_job_resvs(struct pvr_job *job)
+{
+	if (job->hwrt) {
+		enum dma_resv_usage usage = job->type == DRM_PVR_JOB_TYPE_GEOMETRY ?
+					    DMA_RESV_USAGE_WRITE : DMA_RESV_USAGE_READ;
+		struct drm_gem_object *obj = gem_from_pvr_gem(job->hwrt->fw_obj->gem);
+
+		dma_resv_add_fence(obj->resv, &job->base.s_fence->finished, usage);
+	}
+}
+
+static void
+update_job_resvs_for_each(struct pvr_job_data *job_data, u32 job_count)
+{
+	for (u32 i = 0; i < job_count; i++)
+		update_job_resvs(job_data[i].job);
+}
+
+static bool can_combine_jobs(struct pvr_job *a, struct pvr_job *b)
+{
+	struct pvr_job *geom_job = a, *frag_job = b;
+	struct dma_fence *fence;
+	unsigned long index;
+
+	/* Geometry and fragment jobs can be combined if they are queued to the
+	 * same context and targeting the same HWRT.
+	 */
+	if (a->type != DRM_PVR_JOB_TYPE_GEOMETRY ||
+	    b->type != DRM_PVR_JOB_TYPE_FRAGMENT ||
+	    a->ctx != b->ctx ||
+	    a->hwrt != b->hwrt)
+		return false;
+
+	xa_for_each(&frag_job->base.dependencies, index, fence) {
+		/* We combine when we see an explicit geom -> frag dep. */
+		if (&geom_job->base.s_fence->scheduled == fence)
+			return true;
+	}
+
+	return false;
+}
+
+static struct dma_fence *
+get_last_queued_job_scheduled_fence(struct pvr_queue *queue,
+				    struct pvr_job_data *job_data,
+				    u32 cur_job_pos)
+{
+	/* We iterate over the current job array in reverse order to grab the
+	 * last to-be-queued job targeting the same queue.
+	 */
+	for (u32 i = cur_job_pos; i > 0; i--) {
+		struct pvr_job *job = job_data[i - 1].job;
+
+		if (job->ctx == queue->ctx && job->type == queue->type)
+			return dma_fence_get(&job->base.s_fence->scheduled);
+	}
+
+	/* If we didn't find any, we just return the last queued job scheduled
+	 * fence attached to the queue.
+	 */
+	return dma_fence_get(queue->last_queued_job_scheduled_fence);
+}
+
+static int
+pvr_jobs_link_geom_frag(struct pvr_job_data *job_data, u32 *job_count)
+{
+	for (u32 i = 0; i < *job_count - 1; i++) {
+		struct pvr_job *geom_job = job_data[i].job;
+		struct pvr_job *frag_job = job_data[i + 1].job;
+		struct pvr_queue *frag_queue;
+		struct dma_fence *f;
+
+		if (!can_combine_jobs(job_data[i].job, job_data[i + 1].job))
+			continue;
+
+		/* The fragment job will be submitted by the geometry queue. We
+		 * need to make sure it comes after all the other fragment jobs
+		 * queued before it.
+		 */
+		frag_queue = pvr_context_get_queue_for_job(frag_job->ctx,
+							   frag_job->type);
+		f = get_last_queued_job_scheduled_fence(frag_queue, job_data,
+							i);
+		if (f) {
+			int err = drm_sched_job_add_dependency(&geom_job->base,
+							       f);
+			if (err) {
+				*job_count = i;
+				return err;
+			}
+		}
+
+		/* The KCCB slot will be reserved by the geometry job, so we can
+		 * drop the KCCB fence on the fragment job.
+		 */
+		pvr_kccb_fence_put(frag_job->kccb_fence);
+		frag_job->kccb_fence = NULL;
+
+		geom_job->paired_job = frag_job;
+		frag_job->paired_job = geom_job;
+
+		/* Skip the fragment job we just paired to the geometry job. */
+		i++;
+	}
+
+	return 0;
+}
+
+/**
+ * pvr_submit_jobs() - Submit jobs to the GPU
+ * @pvr_dev: Target PowerVR device.
+ * @pvr_file: Pointer to PowerVR file structure.
+ * @args: Ioctl args.
+ *
+ * This initial implementation is entirely synchronous; on return the GPU will
+ * be idle. This will not be the case for future implementations.
+ *
+ * Returns:
+ *  * 0 on success,
+ *  * -%EFAULT if arguments can not be copied from user space, or
+ *  * -%EINVAL on invalid arguments, or
+ *  * Any other error.
+ */
+int
+pvr_submit_jobs(struct pvr_device *pvr_dev, struct pvr_file *pvr_file,
+		struct drm_pvr_ioctl_submit_jobs_args *args)
+{
+	struct pvr_job_data *job_data = NULL;
+	struct drm_pvr_job *job_args;
+	struct xarray signal_array;
+	u32 jobs_alloced = 0;
+	struct drm_exec exec;
+	int err;
+
+	if (!args->jobs.count)
+		return -EINVAL;
+
+	err = PVR_UOBJ_GET_ARRAY(job_args, &args->jobs);
+	if (err)
+		return err;
+
+	job_data = kvmalloc_array(args->jobs.count, sizeof(*job_data),
+				  GFP_KERNEL | __GFP_ZERO);
+	if (!job_data) {
+		err = -ENOMEM;
+		goto out_free;
+	}
+
+	err = pvr_job_data_init(pvr_dev, pvr_file, job_args, &args->jobs.count,
+				job_data);
+	if (err)
+		goto out_free;
+
+	jobs_alloced = args->jobs.count;
+
+	/*
+	 * Flush MMU if needed - this has been deferred until now to avoid
+	 * overuse of this expensive operation.
+	 */
+	err = pvr_mmu_flush_exec(pvr_dev, false);
+	if (err)
+		goto out_job_data_cleanup;
+
+	drm_exec_init(&exec, DRM_EXEC_INTERRUPTIBLE_WAIT | DRM_EXEC_IGNORE_DUPLICATES, 0);
+
+	xa_init_flags(&signal_array, XA_FLAGS_ALLOC);
+
+	err = prepare_job_syncs_for_each(pvr_file, job_data, &args->jobs.count,
+					 &signal_array);
+	if (err)
+		goto out_exec_fini;
+
+	err = prepare_job_resvs_for_each(&exec, job_data, args->jobs.count);
+	if (err)
+		goto out_exec_fini;
+
+	err = pvr_jobs_link_geom_frag(job_data, &args->jobs.count);
+	if (err)
+		goto out_exec_fini;
+
+	/* Anything after that point must succeed because we start exposing job
+	 * finished fences to the outside world.
+	 */
+	update_job_resvs_for_each(job_data, args->jobs.count);
+	push_jobs(job_data, args->jobs.count);
+	pvr_sync_signal_array_push_fences(&signal_array);
+	err = 0;
+
+out_exec_fini:
+	drm_exec_fini(&exec);
+	pvr_sync_signal_array_cleanup(&signal_array);
+
+out_job_data_cleanup:
+	pvr_job_data_fini(job_data, jobs_alloced);
+
+out_free:
+	kvfree(job_data);
+	kvfree(job_args);
+
+	return err;
+}