linux-kernel - Re: [PATCH v2 15/34] media: iris: add handling for interrupt service routine(ISR) invoked by hardware

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Message-ID: <23a3955e-744f-4436-adb7-790de9c2f084@linaro.org>
Date: Tue, 19 Dec 2023 12:48:33 +0100
From: Konrad Dybcio <konrad.dybcio@...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, mchehab@...nel.org, bryan.odonoghue@...aro.org
Cc: linux-arm-msm@...r.kernel.org, quic_abhinavk@...cinc.com
Subject: Re: [PATCH v2 15/34] media: iris: add handling for interrupt service
 routine(ISR) invoked by hardware

On 18.12.2023 12:32, Dikshita Agarwal wrote:
> Allocate interrupt resources, enable the interrupt line and IRQ handling.
> Register the IRQ handler to be called when interrupt occurs and
> the function to be called from IRQ handler thread.
> The threads invoke the driver's response handler which handles
> all different responses from firmware.
> 
> Signed-off-by: Dikshita Agarwal <quic_dikshita@...cinc.com>
> ---
[...]

> +
> +irqreturn_t iris_hfi_isr_handler(int irq, void *data)
> +{
> +	struct iris_core *core = data;
> +
> +	if (!core)
> +		return IRQ_NONE;
Should this even be possible?

> +
> +	mutex_lock(&core->lock);
> +	call_vpu_op(core, clear_interrupt, core);
> +	mutex_unlock(&core->lock);
> +
> +	__response_handler(core);
> +
> +	if (!call_vpu_op(core, watchdog, core, core->intr_status))
> +		enable_irq(irq);
> +
> +	return IRQ_HANDLED;
> +}
> diff --git a/drivers/media/platform/qcom/vcodec/iris/iris_hfi.h b/drivers/media/platform/qcom/vcodec/iris/iris_hfi.h
> index 8a057cc..8a62986 100644
> --- a/drivers/media/platform/qcom/vcodec/iris/iris_hfi.h
> +++ b/drivers/media/platform/qcom/vcodec/iris/iris_hfi.h
> @@ -14,4 +14,7 @@ int iris_hfi_core_deinit(struct iris_core *core);
>  int iris_hfi_session_open(struct iris_inst *inst);
>  int iris_hfi_session_close(struct iris_inst *inst);
>  
> +irqreturn_t iris_hfi_isr(int irq, void *data);
> +irqreturn_t iris_hfi_isr_handler(int irq, void *data);
> +
>  #endif
> diff --git a/drivers/media/platform/qcom/vcodec/iris/iris_hfi_response.c b/drivers/media/platform/qcom/vcodec/iris/iris_hfi_response.c
> new file mode 100644
> index 0000000..829f3f6
> --- /dev/null
> +++ b/drivers/media/platform/qcom/vcodec/iris/iris_hfi_response.c
> @@ -0,0 +1,184 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#include "hfi_defines.h"
> +#include "iris_hfi_packet.h"
> +#include "iris_hfi_response.h"
> +
> +static void print_sfr_message(struct iris_core *core)
I'm not sure how 'print' relates to what this function does

[...]

> +static int handle_system_error(struct iris_core *core,
> +			       struct hfi_packet *pkt)
> +{
> +	print_sfr_message(core);
> +
> +	iris_core_deinit(core);
Either take the return value of /\ into account, or make this function
void.

> +
> +	return 0;
> +}

[...]

> +
> +struct sfr_buffer {
> +	u32 bufsize;
> +	u8 rg_data[];
Looks like you skipped static code checks.. Use __counted_by

[...]

> @@ -17,6 +17,8 @@
>  #define CPU_CS_VCICMDARG0_IRIS3     (CPU_CS_BASE_OFFS_IRIS3 + 0x24)
>  #define CPU_CS_VCICMDARG1_IRIS3     (CPU_CS_BASE_OFFS_IRIS3 + 0x28)
>  
> +#define CPU_CS_A2HSOFTINTCLR_IRIS3  (CPU_CS_BASE_OFFS_IRIS3 + 0x1C)
You're mixing upper and lowercase hex throughout your defines.

[...]

> +static int clear_interrupt_iris3(struct iris_core *core)
> +{
> +	u32 intr_status = 0, mask = 0;
> +	int ret;
> +
> +	ret = read_register(core, WRAPPER_INTR_STATUS_IRIS3, &intr_status);
> +	if (ret)
> +		return ret;
> +
> +	mask = (WRAPPER_INTR_STATUS_A2H_BMSK_IRIS3 |
> +		WRAPPER_INTR_STATUS_A2HWD_BMSK_IRIS3 |
> +		CTRL_INIT_IDLE_MSG_BMSK_IRIS3);
unnecesary parentheses

> +
> +	if (intr_status & mask)
> +		core->intr_status |= intr_status;
> +
> +	ret = write_register(core, CPU_CS_A2HSOFTINTCLR_IRIS3, 1);
> +
> +	return ret;
why not return write_register directly?

Konrad