[PATCH v3 5/7] drm/panfrost: Add a new ioctl to submit batches
Steven Price
steven.price at arm.com
Fri Jul 2 15:31:46 UTC 2021
On 02/07/2021 15:32, Boris Brezillon wrote:
> This should help limit the number of ioctls when submitting multiple
> jobs. The new ioctl also supports syncobj timelines and BO access flags.
>
> v3:
> * Re-use panfrost_get_job_bos() and panfrost_get_job_in_syncs() in the
> old submit path
>
> Signed-off-by: Boris Brezillon <boris.brezillon at collabora.com>
Better, but I was hoping we can mostly delete panfrost_ioctl_submit(),
leaving something along the lines of:
static int panfrost_ioctl_submit(struct drm_device *dev, void *data,
struct drm_file *file)
{
struct panfrost_submitqueue *queue;
struct drm_panfrost_submit *args = data;
struct drm_panfrost_job submit_args = {
.head = args->jc,
.bos = args->bo_handles,
.in_syncs = args->in_syncs,
.out_syncs = &args->out_sync, // FIXME
.in_sync_count = args->in_sync_count,
.out_sync_count = args->out_sync > 0 ? 1 : 0,
.bo_count = args->bo_handle_count,
.requirements = args->requirements
};
int ret;
queue = panfrost_submitqueue_get(file->driver_priv, 0);
ret = panfrost_submit_job(dev, file, queue, &submit_args,
sizeof(u32), ...);
return ret;
}
But obviously the out_sync part needs special handling as we can't just
pass a kernel pointer in like that ;)
I'd like the above the duplication of things like this:
> + kref_init(&job->refcount);
> +
> + job->pfdev = pfdev;
> + job->jc = args->head;
> + job->requirements = args->requirements;
> + job->flush_id = panfrost_gpu_get_latest_flush_id(pfdev);
> + job->file_priv = file_priv->driver_priv;
> + xa_init_flags(&job->deps, XA_FLAGS_ALLOC);
As otherwise someone is going to mess up in the future and this is going
to diverge between the two ioctls.
Steve
> ---
> drivers/gpu/drm/panfrost/panfrost_drv.c | 366 +++++++++++++++++++-----
> drivers/gpu/drm/panfrost/panfrost_job.c | 3 +
> include/uapi/drm/panfrost_drm.h | 84 ++++++
> 3 files changed, 375 insertions(+), 78 deletions(-)
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
> index 6529e5972b47..e2897de6e77d 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_drv.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
> @@ -138,111 +138,95 @@ panfrost_get_job_mappings(struct drm_file *file_priv, struct panfrost_job *job)
> return 0;
> }
>
> -/**
> - * panfrost_lookup_bos() - Sets up job->bo[] with the GEM objects
> - * referenced by the job.
> - * @dev: DRM device
> - * @file_priv: DRM file for this fd
> - * @args: IOCTL args
> - * @job: job being set up
> - *
> - * Resolve handles from userspace to BOs and attach them to job.
> - *
> - * Note that this function doesn't need to unreference the BOs on
> - * failure, because that will happen at panfrost_job_cleanup() time.
> - */
> +#define PANFROST_BO_REF_ALLOWED_FLAGS \
> + (PANFROST_BO_REF_EXCLUSIVE | PANFROST_BO_REF_NO_IMPLICIT_DEP)
> +
> static int
> -panfrost_lookup_bos(struct drm_device *dev,
> - struct drm_file *file_priv,
> - struct drm_panfrost_submit *args,
> - struct panfrost_job *job)
> +panfrost_get_job_bos(struct drm_file *file_priv,
> + u64 refs, u32 ref_stride, u32 count,
> + struct panfrost_job *job)
> {
> + void __user *in = u64_to_user_ptr(refs);
> unsigned int i;
> - int ret;
>
> - job->bo_count = args->bo_handle_count;
> + job->bo_count = count;
>
> - if (!job->bo_count)
> + if (!count)
> return 0;
>
> + job->bos = kvmalloc_array(job->bo_count, sizeof(*job->bos),
> + GFP_KERNEL | __GFP_ZERO);
> job->bo_flags = kvmalloc_array(job->bo_count,
> sizeof(*job->bo_flags),
> GFP_KERNEL | __GFP_ZERO);
> - if (!job->bo_flags)
> + if (!job->bos || !job->bo_flags)
> return -ENOMEM;
>
> - for (i = 0; i < job->bo_count; i++)
> - job->bo_flags[i] = PANFROST_BO_REF_EXCLUSIVE;
> + for (i = 0; i < count; i++) {
> + struct drm_panfrost_bo_ref ref = { };
> + int ret;
>
> - ret = drm_gem_objects_lookup(file_priv,
> - (void __user *)(uintptr_t)args->bo_handles,
> - job->bo_count, &job->bos);
> - if (ret)
> - return ret;
> + ret = copy_struct_from_user(&ref, sizeof(ref),
> + in + (i * ref_stride),
> + ref_stride);
> + if (ret)
> + return ret;
>
> - return panfrost_get_job_mappings(file_priv, job);
> + /* Prior to the BATCH_SUBMIT ioctl all accessed BOs were
> + * treated as exclusive.
> + */
> + if (ref_stride == sizeof(u32))
> + ref.flags = PANFROST_BO_REF_EXCLUSIVE;
> +
> + if ((ref.flags & ~PANFROST_BO_REF_ALLOWED_FLAGS))
> + return -EINVAL;
> +
> + job->bos[i] = drm_gem_object_lookup(file_priv, ref.handle);
> + if (!job->bos[i])
> + return -EINVAL;
> +
> + job->bo_flags[i] = ref.flags;
> + }
> +
> + return 0;
> }
>
> -/**
> - * panfrost_copy_in_sync() - Sets up job->deps with the sync objects
> - * referenced by the job.
> - * @dev: DRM device
> - * @file_priv: DRM file for this fd
> - * @args: IOCTL args
> - * @job: job being set up
> - *
> - * Resolve syncobjs from userspace to fences and attach them to job.
> - *
> - * Note that this function doesn't need to unreference the fences on
> - * failure, because that will happen at panfrost_job_cleanup() time.
> - */
> static int
> -panfrost_copy_in_sync(struct drm_device *dev,
> - struct drm_file *file_priv,
> - struct drm_panfrost_submit *args,
> - struct panfrost_job *job)
> +panfrost_get_job_in_syncs(struct drm_file *file_priv,
> + u64 refs, u32 ref_stride,
> + u32 count, struct panfrost_job *job)
> {
> - u32 *handles;
> - int ret = 0;
> - int i, in_fence_count;
> + const void __user *in = u64_to_user_ptr(refs);
> + unsigned int i;
> + int ret;
>
> - in_fence_count = args->in_sync_count;
> -
> - if (!in_fence_count)
> + if (!count)
> return 0;
>
> - handles = kvmalloc_array(in_fence_count, sizeof(u32), GFP_KERNEL);
> - if (!handles) {
> - ret = -ENOMEM;
> - DRM_DEBUG("Failed to allocate incoming syncobj handles\n");
> - goto fail;
> - }
> -
> - if (copy_from_user(handles,
> - (void __user *)(uintptr_t)args->in_syncs,
> - in_fence_count * sizeof(u32))) {
> - ret = -EFAULT;
> - DRM_DEBUG("Failed to copy in syncobj handles\n");
> - goto fail;
> - }
> -
> - for (i = 0; i < in_fence_count; i++) {
> + for (i = 0; i < count; i++) {
> + struct drm_panfrost_syncobj_ref ref = { };
> struct dma_fence *fence;
>
> - ret = drm_syncobj_find_fence(file_priv, handles[i], 0, 0,
> - &fence);
> + ret = copy_struct_from_user(&ref, sizeof(ref),
> + in + (i * ref_stride),
> + ref_stride);
> if (ret)
> - goto fail;
> + return ret;
> +
> + if (ref.pad)
> + return -EINVAL;
> +
> + ret = drm_syncobj_find_fence(file_priv, ref.handle, ref.point,
> + 0, &fence);
> + if (ret)
> + return ret;
>
> ret = drm_gem_fence_array_add(&job->deps, fence);
> -
> if (ret)
> - goto fail;
> + return ret;
> }
>
> -fail:
> - kvfree(handles);
> - return ret;
> + return 0;
> }
>
> static int panfrost_ioctl_submit(struct drm_device *dev, void *data,
> @@ -289,11 +273,17 @@ static int panfrost_ioctl_submit(struct drm_device *dev, void *data,
> job->flush_id = panfrost_gpu_get_latest_flush_id(pfdev);
> job->file_priv = file->driver_priv;
>
> - ret = panfrost_copy_in_sync(dev, file, args, job);
> + ret = panfrost_get_job_in_syncs(file, args->in_syncs, sizeof(u32),
> + args->in_sync_count, job);
> if (ret)
> goto fail_job;
>
> - ret = panfrost_lookup_bos(dev, file, args, job);
> + ret = panfrost_get_job_bos(file, args->bo_handles, sizeof(u32),
> + args->bo_handle_count, job);
> + if (ret)
> + goto fail_job;
> +
> + ret = panfrost_get_job_mappings(file, job);
> if (ret)
> goto fail_job;
>
> @@ -491,6 +481,225 @@ panfrost_ioctl_destroy_submitqueue(struct drm_device *dev, void *data,
> return panfrost_submitqueue_destroy(priv, id);
> }
>
> +struct panfrost_job_out_sync {
> + struct drm_syncobj *syncobj;
> + struct dma_fence_chain *chain;
> + u64 point;
> +};
> +
> +static void
> +panfrost_put_job_out_syncs(struct panfrost_job_out_sync *out_syncs, u32 count)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < count; i++) {
> + if (!out_syncs[i].syncobj)
> + break;
> +
> + drm_syncobj_put(out_syncs[i].syncobj);
> + kvfree(out_syncs[i].chain);
> + }
> +
> + kvfree(out_syncs);
> +}
> +
> +static struct panfrost_job_out_sync *
> +panfrost_get_job_out_syncs(struct drm_file *file_priv,
> + u64 refs, u32 ref_stride,
> + u32 count)
> +{
> + void __user *in = u64_to_user_ptr(refs);
> + struct panfrost_job_out_sync *out_syncs;
> + unsigned int i;
> + int ret;
> +
> + if (!count)
> + return NULL;
> +
> + out_syncs = kvmalloc_array(count, sizeof(*out_syncs),
> + GFP_KERNEL | __GFP_ZERO);
> + if (!out_syncs)
> + return ERR_PTR(-ENOMEM);
> +
> + for (i = 0; i < count; i++) {
> + struct drm_panfrost_syncobj_ref ref = { };
> +
> + ret = copy_struct_from_user(&ref, sizeof(ref),
> + in + (i * ref_stride),
> + ref_stride);
> + if (ret)
> + goto err_free_out_syncs;
> +
> + if (ref.pad) {
> + ret = -EINVAL;
> + goto err_free_out_syncs;
> + }
> +
> + out_syncs[i].syncobj = drm_syncobj_find(file_priv, ref.handle);
> + if (!out_syncs[i].syncobj) {
> + ret = -EINVAL;
> + goto err_free_out_syncs;
> + }
> +
> + out_syncs[i].point = ref.point;
> + if (!out_syncs[i].point)
> + continue;
> +
> + out_syncs[i].chain = kmalloc(sizeof(*out_syncs[i].chain),
> + GFP_KERNEL);
> + if (!out_syncs[i].chain) {
> + ret = -ENOMEM;
> + goto err_free_out_syncs;
> + }
> + }
> +
> + return out_syncs;
> +
> +err_free_out_syncs:
> + panfrost_put_job_out_syncs(out_syncs, count);
> + return ERR_PTR(ret);
> +}
> +
> +static void
> +panfrost_set_job_out_fence(struct panfrost_job_out_sync *out_syncs,
> + unsigned int count, struct dma_fence *fence)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < count; i++) {
> + if (out_syncs[i].chain) {
> + drm_syncobj_add_point(out_syncs[i].syncobj,
> + out_syncs[i].chain,
> + fence, out_syncs[i].point);
> + out_syncs[i].chain = NULL;
> + } else {
> + drm_syncobj_replace_fence(out_syncs[i].syncobj,
> + fence);
> + }
> + }
> +}
> +
> +#define PANFROST_JD_ALLOWED_REQS PANFROST_JD_REQ_FS
> +
> +static int
> +panfrost_submit_job(struct drm_device *dev, struct drm_file *file_priv,
> + struct panfrost_submitqueue *queue,
> + const struct drm_panfrost_job *args,
> + u32 bo_stride, u32 syncobj_stride)
> +{
> + struct panfrost_device *pfdev = dev->dev_private;
> + struct panfrost_job_out_sync *out_syncs;
> + struct panfrost_job *job;
> + int ret;
> +
> + if (!args->head)
> + return -EINVAL;
> +
> + if (args->requirements & ~PANFROST_JD_ALLOWED_REQS)
> + return -EINVAL;
> +
> + job = kzalloc(sizeof(*job), GFP_KERNEL);
> + if (!job)
> + return -ENOMEM;
> +
> + kref_init(&job->refcount);
> +
> + job->pfdev = pfdev;
> + job->jc = args->head;
> + job->requirements = args->requirements;
> + job->flush_id = panfrost_gpu_get_latest_flush_id(pfdev);
> + job->file_priv = file_priv->driver_priv;
> + xa_init_flags(&job->deps, XA_FLAGS_ALLOC);
> +
> + ret = panfrost_get_job_in_syncs(file_priv,
> + args->in_syncs,
> + syncobj_stride,
> + args->in_sync_count,
> + job);
> + if (ret)
> + goto err_put_job;
> +
> + out_syncs = panfrost_get_job_out_syncs(file_priv,
> + args->out_syncs,
> + syncobj_stride,
> + args->out_sync_count);
> + if (IS_ERR(out_syncs)) {
> + ret = PTR_ERR(out_syncs);
> + goto err_put_job;
> + }
> +
> + ret = panfrost_get_job_bos(file_priv, args->bos, bo_stride,
> + args->bo_count, job);
> + if (ret)
> + goto err_put_job;
> +
> + ret = panfrost_get_job_mappings(file_priv, job);
> + if (ret)
> + goto err_put_job;
> +
> + ret = panfrost_job_push(queue, job);
> + if (ret) {
> + panfrost_put_job_out_syncs(out_syncs, args->out_sync_count);
> + goto err_put_job;
> + }
> +
> + panfrost_set_job_out_fence(out_syncs, args->out_sync_count,
> + job->render_done_fence);
> + panfrost_put_job_out_syncs(out_syncs, args->out_sync_count);
> + return 0;
> +
> +err_put_job:
> + panfrost_job_put(job);
> + return ret;
> +}
> +
> +static int
> +panfrost_ioctl_batch_submit(struct drm_device *dev, void *data,
> + struct drm_file *file_priv)
> +{
> + struct drm_panfrost_batch_submit *args = data;
> + void __user *jobs_args = u64_to_user_ptr(args->jobs);
> + struct panfrost_submitqueue *queue;
> + unsigned int i;
> + int ret;
> +
> + /* Relax this test if new fields are added to
> + * drm_panfrost_{bo_ref,syncobj_ref,job}.
> + */
> + if (args->job_stride < sizeof(struct drm_panfrost_job) ||
> + args->bo_ref_stride < sizeof(struct drm_panfrost_bo_ref) ||
> + args->syncobj_ref_stride < sizeof(struct drm_panfrost_syncobj_ref))
> + return -EINVAL;
> +
> + queue = panfrost_submitqueue_get(file_priv->driver_priv, args->queue);
> + if (IS_ERR(queue))
> + return PTR_ERR(queue);
> +
> + for (i = 0; i < args->job_count; i++) {
> + struct drm_panfrost_job job_args = { };
> +
> + ret = copy_struct_from_user(&job_args, sizeof(job_args),
> + jobs_args + (i * args->job_stride),
> + args->job_stride);
> + if (ret) {
> + args->fail_idx = i;
> + goto out_put_queue;
> + }
> +
> + ret = panfrost_submit_job(dev, file_priv, queue, &job_args,
> + args->bo_ref_stride,
> + args->syncobj_ref_stride);
> + if (ret) {
> + args->fail_idx = i;
> + goto out_put_queue;
> + }
> + }
> +
> +out_put_queue:
> + panfrost_submitqueue_put(queue);
> + return 0;
> +}
> +
> int panfrost_unstable_ioctl_check(void)
> {
> if (!unstable_ioctls)
> @@ -570,6 +779,7 @@ static const struct drm_ioctl_desc panfrost_drm_driver_ioctls[] = {
> PANFROST_IOCTL(MADVISE, madvise, DRM_RENDER_ALLOW),
> PANFROST_IOCTL(CREATE_SUBMITQUEUE, create_submitqueue, DRM_RENDER_ALLOW),
> PANFROST_IOCTL(DESTROY_SUBMITQUEUE, destroy_submitqueue, DRM_RENDER_ALLOW),
> + PANFROST_IOCTL(BATCH_SUBMIT, batch_submit, DRM_RENDER_ALLOW),
> };
>
> DEFINE_DRM_GEM_FOPS(panfrost_drm_driver_fops);
> diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
> index 56ae89272e19..4e1540bce865 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_job.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_job.c
> @@ -254,6 +254,9 @@ static int panfrost_acquire_object_fences(struct panfrost_job *job)
> return ret;
> }
>
> + if (job->bo_flags[i] & PANFROST_BO_REF_NO_IMPLICIT_DEP)
> + continue;
> +
> ret = drm_gem_fence_array_add_implicit(&job->deps, job->bos[i],
> exclusive);
> if (ret)
> diff --git a/include/uapi/drm/panfrost_drm.h b/include/uapi/drm/panfrost_drm.h
> index 7ee02fd1ac75..ce0c1b96a58c 100644
> --- a/include/uapi/drm/panfrost_drm.h
> +++ b/include/uapi/drm/panfrost_drm.h
> @@ -23,6 +23,7 @@ extern "C" {
> #define DRM_PANFROST_MADVISE 0x08
> #define DRM_PANFROST_CREATE_SUBMITQUEUE 0x09
> #define DRM_PANFROST_DESTROY_SUBMITQUEUE 0x0a
> +#define DRM_PANFROST_BATCH_SUBMIT 0x0b
>
> #define DRM_IOCTL_PANFROST_SUBMIT DRM_IOW(DRM_COMMAND_BASE + DRM_PANFROST_SUBMIT, struct drm_panfrost_submit)
> #define DRM_IOCTL_PANFROST_WAIT_BO DRM_IOW(DRM_COMMAND_BASE + DRM_PANFROST_WAIT_BO, struct drm_panfrost_wait_bo)
> @@ -33,6 +34,7 @@ extern "C" {
> #define DRM_IOCTL_PANFROST_MADVISE DRM_IOWR(DRM_COMMAND_BASE + DRM_PANFROST_MADVISE, struct drm_panfrost_madvise)
> #define DRM_IOCTL_PANFROST_CREATE_SUBMITQUEUE DRM_IOWR(DRM_COMMAND_BASE + DRM_PANFROST_CREATE_SUBMITQUEUE, struct drm_panfrost_create_submitqueue)
> #define DRM_IOCTL_PANFROST_DESTROY_SUBMITQUEUE DRM_IOWR(DRM_COMMAND_BASE + DRM_PANFROST_DESTROY_SUBMITQUEUE, __u32)
> +#define DRM_IOCTL_PANFROST_BATCH_SUBMIT DRM_IOWR(DRM_COMMAND_BASE + DRM_PANFROST_BATCH_SUBMIT, struct drm_panfrost_batch_submit)
>
> /*
> * Unstable ioctl(s): only exposed when the unsafe unstable_ioctls module
> @@ -241,7 +243,89 @@ struct drm_panfrost_create_submitqueue {
> __u32 id; /* out, identifier */
> };
>
> +/* Syncobj reference passed at job submission time to encode explicit
> + * input/output fences.
> + */
> +struct drm_panfrost_syncobj_ref {
> + __u32 handle;
> + __u32 pad;
> + __u64 point;
> +};
> +
> #define PANFROST_BO_REF_EXCLUSIVE 0x1
> +#define PANFROST_BO_REF_NO_IMPLICIT_DEP 0x2
> +
> +/* Describes a BO referenced by a job and the type of access. */
> +struct drm_panfrost_bo_ref {
> + __u32 handle;
> + __u32 flags;
> +};
> +
> +/* Describes a GPU job and the resources attached to it. */
> +struct drm_panfrost_job {
> + /** GPU pointer to the head of the job chain. */
> + __u64 head;
> +
> + /**
> + * Array of drm_panfrost_bo_ref objects describing the BOs referenced
> + * by this job.
> + */
> + __u64 bos;
> +
> + /**
> + * Arrays of drm_panfrost_syncobj_ref objects describing the input
> + * and output fences.
> + */
> + __u64 in_syncs;
> + __u64 out_syncs;
> +
> + /** Syncobj reference array sizes. */
> + __u32 in_sync_count;
> + __u32 out_sync_count;
> +
> + /** BO reference array size. */
> + __u32 bo_count;
> +
> + /** Combination of PANFROST_JD_REQ_* flags. */
> + __u32 requirements;
> +};
> +
> +/* Used to submit multiple jobs in one call */
> +struct drm_panfrost_batch_submit {
> + /**
> + * Stride of the jobs array (needed to ease extension of the
> + * BATCH_SUBMIT ioctl). Should be set to
> + * sizeof(struct drm_panfrost_job).
> + */
> + __u32 job_stride;
> +
> + /** Number of jobs to submit. */
> + __u32 job_count;
> +
> + /* Pointer to a job array. */
> + __u64 jobs;
> +
> + /**
> + * Stride of the BO and syncobj reference arrays (needed to ease
> + * extension of the BATCH_SUBMIT ioctl). Should be set to
> + * sizeof(struct drm_panfrost_bo_ref).
> + */
> + __u32 bo_ref_stride;
> + __u32 syncobj_ref_stride;
> +
> + /**
> + * If the submission fails, this encodes the index of the job
> + * failed.
> + */
> + __u32 fail_idx;
> +
> + /**
> + * ID of the queue to submit those jobs to. 0 is the default
> + * submit queue and should always exists. If you need a dedicated
> + * queue, create it with DRM_IOCTL_PANFROST_CREATE_SUBMITQUEUE.
> + */
> + __u32 queue;
> +};
>
> #if defined(__cplusplus)
> }
>
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