linux-kernel - Re: [PATCH v2 09/34] media: iris: initialize shared queues for host and firmware communication

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Message-ID: <057c9f67-3ef6-438a-91bf-996c3c45c6d5@linaro.org>
Date: Mon, 18 Dec 2023 20:46:57 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Dikshita Agarwal <quic_dikshita@...cinc.com>,
 linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
 stanimir.k.varbanov@...il.com, quic_vgarodia@...cinc.com, agross@...nel.org,
 andersson@...nel.org, konrad.dybcio@...aro.org, mchehab@...nel.org,
 bryan.odonoghue@...aro.org
Cc: linux-arm-msm@...r.kernel.org, quic_abhinavk@...cinc.com
Subject: Re: [PATCH v2 09/34] media: iris: initialize shared queues for host
 and firmware communication

On 18/12/2023 13:32, Dikshita Agarwal wrote:
> Shared queues are used for communication between driver and firmware.
> There are 3 types of queues:
> Command queue - driver to write any command to firmware.
> Message queue - firmware to send any response to driver.
> Debug queue - firmware to write debug message.
> 
> Above queues are initialized and configured to firmware during probe.
> 
> Signed-off-by: Dikshita Agarwal <quic_dikshita@...cinc.com>
> ---
>   drivers/media/platform/qcom/vcodec/iris/Makefile   |  2 ++
>   .../media/platform/qcom/vcodec/iris/iris_core.h    | 11 ++++++++
>   .../media/platform/qcom/vcodec/iris/iris_probe.c   | 31 ++++++++++++++++++++++
>   3 files changed, 44 insertions(+)
> 
> diff --git a/drivers/media/platform/qcom/vcodec/iris/Makefile b/drivers/media/platform/qcom/vcodec/iris/Makefile
> index 12a74de..59798e5d 100644
> --- a/drivers/media/platform/qcom/vcodec/iris/Makefile
> +++ b/drivers/media/platform/qcom/vcodec/iris/Makefile
> @@ -1,3 +1,5 @@
> +iris-objs += ../hfi_queue.o
> +
>   iris-objs += iris_probe.o \
>                resources.o \
>                iris_state.o
> diff --git a/drivers/media/platform/qcom/vcodec/iris/iris_core.h b/drivers/media/platform/qcom/vcodec/iris/iris_core.h
> index 56a5b7d..77124f9 100644
> --- a/drivers/media/platform/qcom/vcodec/iris/iris_core.h
> +++ b/drivers/media/platform/qcom/vcodec/iris/iris_core.h
> @@ -9,6 +9,7 @@
>   #include <linux/types.h>
>   #include <media/v4l2-device.h>
>   
> +#include "../hfi_queue.h"
>   #include "iris_state.h"
>   
>   /**
> @@ -30,6 +31,11 @@
>    * @reset_tbl: table of iris reset clocks
>    * @reset_count: count of iris reset clocks
>    * @state: current state of core
> + * @iface_q_table: Interface queue table memory
> + * @command_queue: shared interface queue to send commands to firmware
> + * @message_queue: shared interface queue to receive responses from firmware
> + * @debug_queue: shared interface queue to receive debug info from firmware
> + * @sfr: SFR register memory
>    */
>   
>   struct iris_core {
> @@ -49,6 +55,11 @@ struct iris_core {
>   	struct reset_info			*reset_tbl;
>   	u32					reset_count;
>   	enum iris_core_state			state;
> +	struct mem_desc				iface_q_table;
> +	struct iface_q_info			command_queue;
> +	struct iface_q_info			message_queue;
> +	struct iface_q_info			debug_queue;
> +	struct mem_desc				sfr;
>   };
>   
>   #endif
> diff --git a/drivers/media/platform/qcom/vcodec/iris/iris_probe.c b/drivers/media/platform/qcom/vcodec/iris/iris_probe.c
> index 7bb9c92..fd349a3 100644
> --- a/drivers/media/platform/qcom/vcodec/iris/iris_probe.c
> +++ b/drivers/media/platform/qcom/vcodec/iris/iris_probe.c
> @@ -7,6 +7,7 @@
>   #include <linux/of_device.h>
>   #include <linux/platform_device.h>
>   
> +#include "../hfi_queue.h"
>   #include "iris_core.h"
>   #include "resources.h"
>   
> @@ -50,6 +51,10 @@ static void iris_remove(struct platform_device *pdev)
>   	if (!core)
>   		return;
>   
> +	hfi_queue_deinit(core->dev, &core->iface_q_table, &core->sfr,
> +			 &core->command_queue, &core->message_queue,
> +			 &core->debug_queue);
> +
>   	video_unregister_device(core->vdev_dec);
>   
>   	v4l2_device_unregister(&core->v4l2_dev);
> @@ -59,6 +64,7 @@ static int iris_probe(struct platform_device *pdev)
>   {
>   	struct device *dev = &pdev->dev;
>   	struct iris_core *core;
> +	u64 dma_mask;
>   	int ret;
>   
>   	core = devm_kzalloc(&pdev->dev, sizeof(*core), GFP_KERNEL);
> @@ -91,8 +97,33 @@ static int iris_probe(struct platform_device *pdev)
>   
>   	platform_set_drvdata(pdev, core);
>   
> +	/*
> +	 * Specify the max value of address space, which can be used
> +	 * for buffer transactions.
> +	 */
> +	dma_mask = DMA_BIT_MASK(32);
> +	dma_mask &= ~BIT(29);
> +
> +	ret = dma_set_mask_and_coherent(dev, dma_mask);
> +	if (ret)
> +		goto err_vdev_unreg;
> +
> +	dma_set_max_seg_size(&pdev->dev, (unsigned int)DMA_BIT_MASK(32));
> +	dma_set_seg_boundary(&pdev->dev, (unsigned long)DMA_BIT_MASK(64));

This isn't related to queues.

> +
> +	ret = hfi_queue_init(core->dev, &core->iface_q_table, &core->sfr,
> +			     &core->command_queue, &core->message_queue,
> +			     &core->debug_queue, core);
> +	if (ret) {
> +		dev_err_probe(core->dev, ret,
> +			      "%s: interface queues init failed\n", __func__);
> +		goto err_vdev_unreg;
> +	}
> +
>   	return ret;
>   
> +err_vdev_unreg:
> +	iris_unregister_video_device(core);
>   err_v4l2_unreg:
>   	v4l2_device_unregister(&core->v4l2_dev);
>   

-- 
With best wishes
Dmitry