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SubjectRe: [PATCH v2 09/34] media: iris: initialize shared queues for host and firmware communication
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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@quicinc.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


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