Re: [PATCH 6/7] drm/amdkfd: New IOCTL to allocate queue GWS

["Kuehling, Felix" <Felix.Kuehling-5C7GfCeVMHo@public.gmane.org>]

On 2019-05-22 11:51 a.m., Zeng, Oak wrote:
> Add a new kfd ioctl to allocate queue GWS. Queue
> GWS is released on queue destroy.
>
> Change-Id: I60153c26a577992ad873e4292e759e5c3d5bbd15
> Signed-off-by: Oak Zeng <Oak.Zeng@amd.com>
> ---
>   drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 39 ++++++++++++++++++++++++++++++++
>   include/uapi/linux/kfd_ioctl.h           | 20 +++++++++++++++-
>   2 files changed, 58 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> index 38ae53f..828bd66 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> @@ -1559,6 +1559,43 @@ static int kfd_ioctl_unmap_memory_from_gpu(struct file *filep,
>   	return err;
>   }
>   
> +static int kfd_ioctl_alloc_queue_gws(struct file *filep,
> +		struct kfd_process *p, void *data)
> +{
> +	int retval;
> +	struct kfd_ioctl_alloc_queue_gws_args *args = data;
> +	struct kfd_dev *dev = NULL;
> +	struct kgd_mem *mem;
> +
> +	if (args->num_gws == 0)
> +		return -EINVAL;
> +
> +	if (!hws_gws_support ||
> +		dev->dqm->sched_policy == KFD_SCHED_POLICY_NO_HWS)
> +		return -EINVAL;
> +
> +	dev = kfd_device_by_id(args->gpu_id);
> +	if (!dev) {
> +		pr_debug("Could not find gpu id 0x%x\n", args->gpu_id);
> +		return -EINVAL;
> +	}
> +
> +	retval = amdgpu_amdkfd_add_gws_to_process(p->kgd_process_info,
> +			dev->gws, &mem);

Do you want to move this into pqm_set_gws? The corresponding call to 
amdgpu_amdkfd_remove_from_gws is handled in pqm (during queue 
destruction) too.

Regards,
   Felix


> +	if (unlikely(retval))
> +		return retval;
> +
> +	mutex_lock(&p->mutex);
> +	retval = pqm_set_gws(&p->pqm, args->queue_id, mem);
> +	mutex_unlock(&p->mutex);
> +
> +	if (unlikely(retval))
> +		amdgpu_amdkfd_remove_gws_from_process(p->kgd_process_info, mem);
> +
> +	args->first_gws = 0;
> +	return retval;
> +}
> +
>   static int kfd_ioctl_get_dmabuf_info(struct file *filep,
>   		struct kfd_process *p, void *data)
>   {
> @@ -1761,6 +1798,8 @@ static const struct amdkfd_ioctl_desc amdkfd_ioctls[] = {
>   	AMDKFD_IOCTL_DEF(AMDKFD_IOC_IMPORT_DMABUF,
>   				kfd_ioctl_import_dmabuf, 0),
>   
> +	AMDKFD_IOCTL_DEF(AMDKFD_IOC_ALLOC_QUEUE_GWS,
> +			kfd_ioctl_alloc_queue_gws, 0),
>   };
>   
>   #define AMDKFD_CORE_IOCTL_COUNT	ARRAY_SIZE(amdkfd_ioctls)
> diff --git a/include/uapi/linux/kfd_ioctl.h b/include/uapi/linux/kfd_ioctl.h
> index 20917c5..070d1bc 100644
> --- a/include/uapi/linux/kfd_ioctl.h
> +++ b/include/uapi/linux/kfd_ioctl.h
> @@ -410,6 +410,21 @@ struct kfd_ioctl_unmap_memory_from_gpu_args {
>   	__u32 n_success;		/* to/from KFD */
>   };
>   
> +/* Allocate GWS for specific queue
> + *
> + * @gpu_id:      device identifier
> + * @queue_id:    queue's id that GWS is allocated for
> + * @num_gws:     how many GWS to allocate
> + * @first_gws:   index of the first GWS allocated.
> + *               only support contiguous GWS allocation
> + */
> +struct kfd_ioctl_alloc_queue_gws_args {
> +	__u32 gpu_id;		/* to KFD */
> +	__u32 queue_id;		/* to KFD */
> +	__u32 num_gws;		/* to KFD */
> +	__u32 first_gws;	/* from KFD */
> +};
> +
>   struct kfd_ioctl_get_dmabuf_info_args {
>   	__u64 size;		/* from KFD */
>   	__u64 metadata_ptr;	/* to KFD */
> @@ -529,7 +544,10 @@ enum kfd_mmio_remap {
>   #define AMDKFD_IOC_IMPORT_DMABUF		\
>   		AMDKFD_IOWR(0x1D, struct kfd_ioctl_import_dmabuf_args)
>   
> +#define AMDKFD_IOC_ALLOC_QUEUE_GWS		\
> +		AMDKFD_IOWR(0x1E, struct kfd_ioctl_alloc_queue_gws_args)
> +
>   #define AMDKFD_COMMAND_START		0x01
> -#define AMDKFD_COMMAND_END		0x1E
> +#define AMDKFD_COMMAND_END		0x1F
>   
>   #endif
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