Re: [PATCH v7 13/15] drm/tegra: Implement job submission part of new UAPI

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On 6/15/21 10:00 PM, Jon Hunter wrote:

On 10/06/2021 12:04, Mikko Perttunen wrote:
Implement the job submission IOCTL with a minimum feature set.

Signed-off-by: Mikko Perttunen <mperttunen@xxxxxxxxxx>
---
v7:
* Allocate gather BO with DMA API to get page-aligned
   memory
* Add error prints to a few places where they were missing
v6:
* Remove sgt bypass path in gather_bo - this would cause
   cache maintenance to be skipped and is unnecessary in
   general.
* Changes related to moving to using syncpoint IDs
* Add syncobj related code
* Print warning on submit failure describing the issue
* Use ARCH_DMA_ADDR_T_64BIT to check if that is indeed
   the case
* Add support for relative syncpoint wait
* Use pm_runtime_resume_and_get
* Only try to resume engines that support runtime PM
* Removed uapi subdirectory
* Don't use "copy_err" variables for copy_from_user
   return value
* Fix setting of blocklinear flag
v5:
* Add 16K size limit to copies from userspace.
* Guard RELOC_BLOCKLINEAR flag handling to only exist in ARM64
   to prevent oversized shift on 32-bit platforms.
v4:
* Remove all features that are not strictly necessary.
* Split into two patches.
v3:
* Remove WRITE_RELOC. Relocations are now patched implicitly
   when patching is needed.
* Directly call PM runtime APIs on devices instead of using
   power_on/power_off callbacks.
* Remove incorrect mutex unlock in tegra_drm_ioctl_channel_open
* Use XA_FLAGS_ALLOC1 instead of XA_FLAGS_ALLOC
* Accommodate for removal of timeout field and inlining of
   syncpt_incrs array.
* Copy entire user arrays at a time instead of going through
   elements one-by-one.
* Implement waiting of DMA reservations.
* Split out gather_bo implementation into a separate file.
* Fix length parameter passed to sg_init_one in gather_bo
* Cosmetic cleanup.
---
  drivers/gpu/drm/tegra/Makefile    |   2 +
  drivers/gpu/drm/tegra/drm.c       |   4 +-
  drivers/gpu/drm/tegra/gather_bo.c |  82 +++++
  drivers/gpu/drm/tegra/gather_bo.h |  24 ++
  drivers/gpu/drm/tegra/submit.c    | 549 ++++++++++++++++++++++++++++++
  drivers/gpu/drm/tegra/submit.h    |  17 +
  6 files changed, 677 insertions(+), 1 deletion(-)
  create mode 100644 drivers/gpu/drm/tegra/gather_bo.c
  create mode 100644 drivers/gpu/drm/tegra/gather_bo.h
  create mode 100644 drivers/gpu/drm/tegra/submit.c
  create mode 100644 drivers/gpu/drm/tegra/submit.h

...

+int tegra_drm_ioctl_channel_submit(struct drm_device *drm, void *data,
+				   struct drm_file *file)
+{
+	struct tegra_drm_file *fpriv = file->driver_priv;
+	struct drm_tegra_channel_submit *args = data;
+	struct tegra_drm_submit_data *job_data;
+	struct drm_syncobj *syncobj = NULL;
+	struct tegra_drm_context *ctx;
+	struct host1x_job *job;
+	struct gather_bo *bo;
+	u32 i;
+	int err;
+
+	mutex_lock(&fpriv->lock);
+	ctx = xa_load(&fpriv->contexts, args->channel_ctx);
+	if (!ctx) {
+		mutex_unlock(&fpriv->lock);
+		pr_err_ratelimited("%s: %s: invalid channel_ctx '%d'", __func__,
+			current->comm, args->channel_ctx);
+		return -EINVAL;
+	}
+
+	if (args->syncobj_in) {
+		struct dma_fence *fence;
+
+		err = drm_syncobj_find_fence(file, args->syncobj_in, 0, 0, &fence);
+		if (err) {
+			SUBMIT_ERR(ctx, "invalid syncobj_in '%d'", args->syncobj_in);
+			goto unlock;
+		}
+
+		err = dma_fence_wait_timeout(fence, true, msecs_to_jiffies(10000));
+		dma_fence_put(fence);
+		if (err) {
+			SUBMIT_ERR(ctx, "wait for syncobj_in timed out");
+			goto unlock;
+		}
+	}
+
+	if (args->syncobj_out) {
+		syncobj = drm_syncobj_find(file, args->syncobj_out);
+		if (!syncobj) {
+			SUBMIT_ERR(ctx, "invalid syncobj_out '%d'", args->syncobj_out);
+			err = -ENOENT;
+			goto unlock;
+		}
+	}
+
+	/* Allocate gather BO and copy gather words in. */
+	err = submit_copy_gather_data(&bo, drm->dev, ctx, args);
+	if (err)
+		goto unlock;
+
+	job_data = kzalloc(sizeof(*job_data), GFP_KERNEL);
+	if (!job_data) {
+		SUBMIT_ERR(ctx, "failed to allocate memory for job data");
+		err = -ENOMEM;
+		goto put_bo;
+	}
+
+	/* Get data buffer mappings and do relocation patching. */
+	err = submit_process_bufs(ctx, bo, args, job_data);
+	if (err)
+		goto free_job_data;
+
+	/* Allocate host1x_job and add gathers and waits to it. */
+	err = submit_create_job(&job, ctx, bo, args, job_data,
+				&fpriv->syncpoints);
+	if (err)
+		goto free_job_data;
+
+	/* Map gather data for Host1x. */
+	err = host1x_job_pin(job, ctx->client->base.dev);
+	if (err) {
+		SUBMIT_ERR(ctx, "failed to pin job: %d", err);
+		goto put_job;
+	}
+
+	/* Boot engine. */
+	if (pm_runtime_enabled(ctx->client->base.dev)) {
+		err = pm_runtime_resume_and_get(ctx->client->base.dev);
+		if (err < 0) {
+			SUBMIT_ERR(ctx, "could not power up engine: %d", err);
+			goto unpin_job;
+		}
+	}
+
+	job->user_data = job_data;
+	job->release = release_job;
+	job->timeout = 10000;
+
+	/*
+	 * job_data is now part of job reference counting, so don't release
+	 * it from here.
+	 */
+	job_data = NULL;
+
+	/* Submit job to hardware. */
+	err = host1x_job_submit(job);
+	if (err) {
+		SUBMIT_ERR(ctx, "host1x job submission failed: %d", err);
+		goto unpin_job;
+	}


If we fail here, it appears that we may leave rpm enabled. Should we be
calling pm_runtime_put() for any failures from here on?

host1x_job_put will call the release callback, which will do the PM runtime put. So this should be taken care of.

thanks,
Mikko


Cheers
Jon




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