[PATCH v9 03/14] drm/amdgpu: add new IOCTL for usermode queue
Christian König
christian.koenig at amd.com
Tue Apr 30 10:55:55 UTC 2024
Am 26.04.24 um 15:47 schrieb Shashank Sharma:
> 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
>
> V4:
> - Accommodate MQD union related changes in UAPI (Alex)
> - Do not set the queue size twice (Bas)
>
> V5:
> - Remove wrapper functions for queue indexing (Christian)
> - Do not save the queue id/idr in queue itself (Christian)
> - Move the idr allocation in the IP independent generic space
> (Christian)
>
> V6:
> - Check the validity of input IP type (Christian)
>
> V7:
> - Move uq_func from uq_mgr to adev (Alex)
> - Add missing free(queue) for error cases (Yifan)
>
> V9:
> - Rebase
>
> Cc: Alex Deucher <alexander.deucher at amd.com>
> Cc: Christian Koenig <christian.koenig at amd.com>
> Signed-off-by: Shashank Sharma <shashank.sharma at amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 1 +
> drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c | 121 ++++++++++++++++++
> .../gpu/drm/amd/include/amdgpu_userqueue.h | 2 +
> 3 files changed, 124 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index 374970984a61..acee1c279abb 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -2916,6 +2916,7 @@ 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 effc0c7c02cf..df97b856f891 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_userqueue.c
> @@ -23,6 +23,127 @@
> */
>
> #include "amdgpu.h"
> +#include "amdgpu_vm.h"
> +#include "amdgpu_userqueue.h"
> +
> +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_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_device *adev = uq_mgr->adev;
> + const struct amdgpu_userq_funcs *uq_funcs;
> + struct amdgpu_usermode_queue *queue;
> +
> + mutex_lock(&uq_mgr->userq_mutex);
> +
> + queue = amdgpu_userqueue_find(uq_mgr, queue_id);
> + if (!queue) {
> + DRM_DEBUG_DRIVER("Invalid queue id to destroy\n");
> + mutex_unlock(&uq_mgr->userq_mutex);
> + return -EINVAL;
> + }
> +
> + uq_funcs = adev->userq_funcs[queue->queue_type];
> + uq_funcs->mqd_destroy(uq_mgr, queue);
> + idr_remove(&uq_mgr->userq_idr, queue_id);
> + kfree(queue);
> +
> + mutex_unlock(&uq_mgr->userq_mutex);
> + return 0;
> +}
> +
> +static int
> +amdgpu_userqueue_create(struct drm_file *filp, union drm_amdgpu_userq *args)
> +{
> + struct amdgpu_fpriv *fpriv = filp->driver_priv;
> + struct amdgpu_userq_mgr *uq_mgr = &fpriv->userq_mgr;
> + struct amdgpu_device *adev = uq_mgr->adev;
> + const struct amdgpu_userq_funcs *uq_funcs;
> + struct amdgpu_usermode_queue *queue;
> + int qid, r = 0;
> +
> + /* Usermode queues are only supported for GFX/SDMA engines as of now */
> + if (args->in.ip_type != AMDGPU_HW_IP_GFX) {
> + DRM_ERROR("Usermode queue doesn't support IP type %u\n", args->in.ip_type);
> + return -EINVAL;
> + }
> +
> + mutex_lock(&uq_mgr->userq_mutex);
> +
> + uq_funcs = adev->userq_funcs[args->in.ip_type];
> + if (!uq_funcs) {
> + DRM_ERROR("Usermode queue is not supported for this IP (%u)\n", args->in.ip_type);
> + r = -EINVAL;
> + goto unlock;
> + }
> +
> + queue = kzalloc(sizeof(struct amdgpu_usermode_queue), GFP_KERNEL);
> + if (!queue) {
> + DRM_ERROR("Failed to allocate memory for queue\n");
> + r = -ENOMEM;
> + goto unlock;
> + }
> + queue->doorbell_handle = args->in.doorbell_handle;
> + queue->doorbell_index = args->in.doorbell_offset;
> + queue->queue_type = args->in.ip_type;
> + queue->flags = args->in.flags;
> + queue->vm = &fpriv->vm;
> +
> + r = uq_funcs->mqd_create(uq_mgr, &args->in, queue);
> + if (r) {
> + DRM_ERROR("Failed to create Queue\n");
> + kfree(queue);
> + goto unlock;
> + }
> +
> + qid = idr_alloc(&uq_mgr->userq_idr, queue, 1, AMDGPU_MAX_USERQ_COUNT, GFP_KERNEL);
> + if (qid < 0) {
> + DRM_ERROR("Failed to allocate a queue id\n");
> + uq_funcs->mqd_destroy(uq_mgr, queue);
> + kfree(queue);
> + r = -ENOMEM;
> + goto unlock;
> + }
> + args->out.queue_id = qid;
> +
> +unlock:
> + mutex_unlock(&uq_mgr->userq_mutex);
> + return r;
> +}
> +
> +int amdgpu_userq_ioctl(struct drm_device *dev, void *data,
> + struct drm_file *filp)
> +{
> + union drm_amdgpu_userq *args = data;
> + int r = 0;
Don't initialize local variables if it isn't necessary.
We now have automated checkers complaining about that. If some older
compiler complains then rather change the code below to have a goto
error or something like that.
> +
> + 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:
> + r = amdgpu_userqueue_destroy(filp, args->in.queue_id);
> + if (r)
> + DRM_ERROR("Failed to destroy usermode queue\n");
> + break;
> +
> + default:
> + DRM_ERROR("Invalid user queue op specified: %d\n", args->in.op);
That could spam the logs if we ever decide to extend the IOCTL, rather
make the message debug severity.
With those two handled the patch is Reviewed-by: Christian König
<christian.koenig at amd.com>.
Regards,
Christian.
> + 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 93ebe4b61682..b739274c72e1 100644
> --- a/drivers/gpu/drm/amd/include/amdgpu_userqueue.h
> +++ b/drivers/gpu/drm/amd/include/amdgpu_userqueue.h
> @@ -54,6 +54,8 @@ struct amdgpu_userq_mgr {
> struct amdgpu_device *adev;
> };
>
> +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);
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