[PATCH v3 3/9] drm/amdgpu: add new IOCTL for usermode queue

[Bas Nieuwenhuizen]

On Wed, Mar 29, 2023 at 6:05 PM Shashank Sharma <shashank.sharma at amd.com> wrote:
>
> From: Shashank Sharma <contactshashanksharma at gmail.com>
>
> This patch adds:
> - A new IOCTL function to create and destroy
> - A new structure to keep all the user queue data in one place.
> - A function to generate unique index for the queue.
>
> V1: Worked on review comments from RFC patch series:
>   - Alex: Keep a list of queues, instead of single queue per process.
>   - Christian: Use the queue manager instead of global ptrs,
>            Don't keep the queue structure in amdgpu_ctx
>
> V2: Worked on review comments:
>  - Christian:
>    - Formatting of text
>    - There is no need for queuing of userqueues, with idr in place
>  - Alex:
>    - Remove use_doorbell, its unnecessary
>    - Reuse amdgpu_mqd_props for saving mqd fields
>
>  - Code formatting and re-arrangement
>
> V3:
>  - Integration with doorbell manager
>
> Cc: Alex Deucher <alexander.deucher at amd.com>
> Cc: Christian Koenig <christian.koenig at amd.com>
> Signed-off-by: Shashank Sharma <contactshashanksharma at gmail.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c       |   1 +
>  drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c | 113 ++++++++++++++++++
>  .../gpu/drm/amd/include/amdgpu_userqueue.h    |   2 +
>  3 files changed, 116 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index 2d6bcfd727c8..229976a2d0e7 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -2749,6 +2749,7 @@ const struct drm_ioctl_desc amdgpu_ioctls_kms[] = {
>         DRM_IOCTL_DEF_DRV(AMDGPU_GEM_VA, amdgpu_gem_va_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
>         DRM_IOCTL_DEF_DRV(AMDGPU_GEM_OP, amdgpu_gem_op_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
>         DRM_IOCTL_DEF_DRV(AMDGPU_GEM_USERPTR, amdgpu_gem_userptr_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
> +       DRM_IOCTL_DEF_DRV(AMDGPU_USERQ, amdgpu_userq_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
>  };
>
>  static const struct drm_driver amdgpu_kms_driver = {
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
> index 13e1eebc1cb6..353f57c5a772 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
> @@ -22,6 +22,119 @@
>   */
>
>  #include "amdgpu.h"
> +#include "amdgpu_vm.h"
> +#include "amdgpu_userqueue.h"
> +
> +static inline int
> +amdgpu_userqueue_index(struct amdgpu_userq_mgr *uq_mgr, struct amdgpu_usermode_queue *queue)
> +{
> +    return idr_alloc(&uq_mgr->userq_idr, queue, 1, AMDGPU_MAX_USERQ, GFP_KERNEL);
> +}
> +
> +static inline void
> +amdgpu_userqueue_free_index(struct amdgpu_userq_mgr *uq_mgr, int queue_id)
> +{
> +    idr_remove(&uq_mgr->userq_idr, queue_id);
> +}
> +
> +static struct amdgpu_usermode_queue *
> +amdgpu_userqueue_find(struct amdgpu_userq_mgr *uq_mgr, int qid)
> +{
> +    return idr_find(&uq_mgr->userq_idr, qid);
> +}
> +
> +static int amdgpu_userqueue_create(struct drm_file *filp, union drm_amdgpu_userq *args)
> +{
> +    struct amdgpu_usermode_queue *queue;
> +    struct amdgpu_fpriv *fpriv = filp->driver_priv;
> +    struct amdgpu_userq_mgr *uq_mgr = &fpriv->userq_mgr;
> +    struct drm_amdgpu_userq_mqd *mqd_in = &args->in.mqd;
> +    int r;
> +
> +    /* Do we have support userqueues for this IP ? */
> +    if (!uq_mgr->userq_funcs[mqd_in->ip_type]) {
> +        DRM_ERROR("GFX User queues not supported for this IP: %d\n", mqd_in->ip_type);
> +        return -EINVAL;
> +    }
> +
> +    queue = kzalloc(sizeof(struct amdgpu_usermode_queue), GFP_KERNEL);
> +    if (!queue) {
> +        DRM_ERROR("Failed to allocate memory for queue\n");
> +        return -ENOMEM;
> +    }
> +
> +    mutex_lock(&uq_mgr->userq_mutex);
> +    queue->userq_prop.wptr_gpu_addr = mqd_in->wptr_va;
> +    queue->userq_prop.rptr_gpu_addr = mqd_in->rptr_va;
> +    queue->userq_prop.queue_size = mqd_in->queue_size;
> +    queue->userq_prop.hqd_base_gpu_addr = mqd_in->queue_va;
> +    queue->userq_prop.queue_size = mqd_in->queue_size;

This sets queue_size twice.

> +
> +    queue->doorbell_handle = mqd_in->doorbell_handle;
> +    queue->queue_type = mqd_in->ip_type;
> +    queue->flags = mqd_in->flags;
> +    queue->vm = &fpriv->vm;
> +    queue->queue_id = amdgpu_userqueue_index(uq_mgr, queue);
> +    if (queue->queue_id < 0) {
> +        DRM_ERROR("Failed to allocate a queue id\n");
> +        r = queue->queue_id;
> +        goto free_queue;
> +    }
> +
> +    args->out.queue_id = queue->queue_id;
> +    args->out.flags = 0;
> +    mutex_unlock(&uq_mgr->userq_mutex);
> +    return 0;
> +
> +free_queue:
> +    mutex_unlock(&uq_mgr->userq_mutex);
> +    kfree(queue);
> +    return r;
> +}
> +
> +static void amdgpu_userqueue_destroy(struct drm_file *filp, int queue_id)
> +{
> +    struct amdgpu_fpriv *fpriv = filp->driver_priv;
> +    struct amdgpu_userq_mgr *uq_mgr = &fpriv->userq_mgr;
> +    struct amdgpu_usermode_queue *queue;
> +
> +    queue = amdgpu_userqueue_find(uq_mgr, queue_id);
> +    if (!queue) {
> +        DRM_DEBUG_DRIVER("Invalid queue id to destroy\n");
> +        return;
> +    }
> +
> +    mutex_lock(&uq_mgr->userq_mutex);
> +    amdgpu_userqueue_free_index(uq_mgr, queue->queue_id);
> +    mutex_unlock(&uq_mgr->userq_mutex);
> +    kfree(queue);
> +}
> +
> +int amdgpu_userq_ioctl(struct drm_device *dev, void *data,
> +                      struct drm_file *filp)
> +{
> +    union drm_amdgpu_userq *args = data;
> +    int r = 0;
> +
> +    switch (args->in.op) {
> +    case AMDGPU_USERQ_OP_CREATE:
> +        r = amdgpu_userqueue_create(filp, args);
> +        if (r)
> +            DRM_ERROR("Failed to create usermode queue\n");
> +        break;
> +
> +    case AMDGPU_USERQ_OP_FREE:
> +        amdgpu_userqueue_destroy(filp, args->in.queue_id);
> +        break;
> +
> +    default:
> +        DRM_ERROR("Invalid user queue op specified: %d\n", args->in.op);
> +        return -EINVAL;
> +    }
> +
> +    return r;
> +}
> +
>
>  int amdgpu_userq_mgr_init(struct amdgpu_userq_mgr *userq_mgr, struct amdgpu_device *adev)
>  {
> diff --git a/drivers/gpu/drm/amd/include/amdgpu_userqueue.h b/drivers/gpu/drm/amd/include/amdgpu_userqueue.h
> index 7eeb8c9e6575..7625a862b1fc 100644
> --- a/drivers/gpu/drm/amd/include/amdgpu_userqueue.h
> +++ b/drivers/gpu/drm/amd/include/amdgpu_userqueue.h
> @@ -42,6 +42,8 @@ struct amdgpu_userq_funcs {
>         void (*mqd_destroy)(struct amdgpu_userq_mgr *, struct amdgpu_usermode_queue *);
>  };
>
> +int amdgpu_userq_ioctl(struct drm_device *dev, void *data, struct drm_file *filp);
> +
>  int amdgpu_userq_mgr_init(struct amdgpu_userq_mgr *userq_mgr, struct amdgpu_device *adev);
>
>  void amdgpu_userq_mgr_fini(struct amdgpu_userq_mgr *userq_mgr);
> --
> 2.40.0
>