linux-kernel - Re: [PATCH v2 1/4] habanalabs: Mark queue as expecting to CB handle or address

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Date:   Sat, 5 Oct 2019 09:48:34 +0300
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     Tomer Tayar <ttayar@...ana.ai>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/4] habanalabs: Mark queue as expecting to CB handle
 or address

On Thu, Oct 3, 2019 at 6:22 PM Tomer Tayar <ttayar@...ana.ai> wrote:
>
> Jobs on some queues must be provided with a handle to a driver command
> buffer object, while for other queues, jobs must be provided with an
> address to a command buffer.
> Currently the distinction is done based on the queue type, which is less
> flexible if the same type of queue behaves differently on different
> types of ASIC.
> This patch adds a new queue property for this target, which is
> configured per queue type per ASIC type.
>
> Signed-off-by: Tomer Tayar <ttayar@...ana.ai>
> ---
>  drivers/misc/habanalabs/command_submission.c | 4 +++-
>  drivers/misc/habanalabs/goya/goya.c          | 3 +++
>  drivers/misc/habanalabs/habanalabs.h         | 3 +++
>  3 files changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/misc/habanalabs/command_submission.c b/drivers/misc/habanalabs/command_submission.c
> index a9ac045dcfde..f44205540520 100644
> --- a/drivers/misc/habanalabs/command_submission.c
> +++ b/drivers/misc/habanalabs/command_submission.c
> @@ -414,7 +414,9 @@ static struct hl_cb *validate_queue_index(struct hl_device *hdev,
>                         "Queue index %d is restricted for the kernel driver\n",
>                         chunk->queue_index);
>                 return NULL;
> -       } else if (hw_queue_prop->type == QUEUE_TYPE_INT) {
> +       }
> +
> +       if (!hw_queue_prop->requires_kernel_cb) {
>                 *ext_queue = false;
>                 return (struct hl_cb *) (uintptr_t) chunk->cb_handle;
>         }
> diff --git a/drivers/misc/habanalabs/goya/goya.c b/drivers/misc/habanalabs/goya/goya.c
> index 09caef7642fd..71693fcffb16 100644
> --- a/drivers/misc/habanalabs/goya/goya.c
> +++ b/drivers/misc/habanalabs/goya/goya.c
> @@ -337,17 +337,20 @@ void goya_get_fixed_properties(struct hl_device *hdev)
>         for (i = 0 ; i < NUMBER_OF_EXT_HW_QUEUES ; i++) {
>                 prop->hw_queues_props[i].type = QUEUE_TYPE_EXT;
>                 prop->hw_queues_props[i].driver_only = 0;
> +               prop->hw_queues_props[i].requires_kernel_cb = 1;
>         }
>
>         for (; i < NUMBER_OF_EXT_HW_QUEUES + NUMBER_OF_CPU_HW_QUEUES ; i++) {
>                 prop->hw_queues_props[i].type = QUEUE_TYPE_CPU;
>                 prop->hw_queues_props[i].driver_only = 1;
> +               prop->hw_queues_props[i].requires_kernel_cb = 0;
>         }
>
>         for (; i < NUMBER_OF_EXT_HW_QUEUES + NUMBER_OF_CPU_HW_QUEUES +
>                         NUMBER_OF_INT_HW_QUEUES; i++) {
>                 prop->hw_queues_props[i].type = QUEUE_TYPE_INT;
>                 prop->hw_queues_props[i].driver_only = 0;
> +               prop->hw_queues_props[i].requires_kernel_cb = 0;
>         }
>
>         for (; i < HL_MAX_QUEUES; i++)
> diff --git a/drivers/misc/habanalabs/habanalabs.h b/drivers/misc/habanalabs/habanalabs.h
> index c3d24ffad9fa..f47f4b22cb6b 100644
> --- a/drivers/misc/habanalabs/habanalabs.h
> +++ b/drivers/misc/habanalabs/habanalabs.h
> @@ -98,10 +98,13 @@ enum hl_queue_type {
>   * @type: queue type.
>   * @driver_only: true if only the driver is allowed to send a job to this queue,
>   *               false otherwise.
> + * @requires_kernel_cb: true if a CB handle must be provided for jobs on this
> + *                      queue, false otherwise (a CB address must be provided).
>   */
>  struct hw_queue_properties {
>         enum hl_queue_type      type;
>         u8                      driver_only;
> +       u8                      requires_kernel_cb;
>  };
>
>  /**
> --
> 2.17.1
>

Patches 1-4 are:
Reviewed-by: Oded Gabbay <oded.gabbay@...il.com>

However, I'm only applying patches 1 & 2 to -next, because 3 & 4
mostly add code which is not relevant to GOYA, without much changing
existing code, as opposed to patches 1&2.

Oded