netdev - Re: [PATCH net-next v3 3/3] net: stmmac: Add driver support for DWMAC5 safety IRQ Support

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Message-ID: <b7uaftelklsquxv5apq5cpkegxfsdsefx3vjdh2kuqdlrq5oia@r4ahkp4dxs6z>
Date: Mon, 4 Dec 2023 14:43:02 -0600
From: Andrew Halaney <ahalaney@...hat.com>
To: Suraj Jaiswal <quic_jsuraj@...cinc.com>
Cc: Vinod Koul <vkoul@...nel.org>, 
	Bhupesh Sharma <bhupesh.sharma@...aro.org>, Andy Gross <agross@...nel.org>, 
	Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Alexandre Torgue <alexandre.torgue@...s.st.com>, Jose Abreu <joabreu@...opsys.com>, 
	Maxime Coquelin <mcoquelin.stm32@...il.com>, netdev@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-stm32@...md-mailman.stormreply.com, Prasad Sodagudi <psodagud@...cinc.com>, kernel@...cinc.com
Subject: Re: [PATCH net-next v3 3/3] net: stmmac: Add driver support for
 DWMAC5 safety IRQ Support

On Mon, Dec 04, 2023 at 06:56:17PM +0530, Suraj Jaiswal wrote:
> Add IRQ support to listen HW safety IRQ like ECC,DPP,FSM
> fault and print the fault information in the kernel
> log.
> 
> Signed-off-by: Suraj Jaiswal <quic_jsuraj@...cinc.com>
> ---
>  drivers/net/ethernet/stmicro/stmmac/common.h   |  1 +
>  drivers/net/ethernet/stmicro/stmmac/stmmac.h   |  2 ++
>  .../net/ethernet/stmicro/stmmac/stmmac_main.c  | 18 ++++++++++++++++++
>  .../ethernet/stmicro/stmmac/stmmac_platform.c  |  9 +++++++++
>  4 files changed, 30 insertions(+)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
> index 6b935922054d..c4821c7ab674 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/common.h
> +++ b/drivers/net/ethernet/stmicro/stmmac/common.h
> @@ -347,6 +347,7 @@ enum request_irq_err {
>  	REQ_IRQ_ERR_SFTY_UE,
>  	REQ_IRQ_ERR_SFTY_CE,
>  	REQ_IRQ_ERR_LPI,
> +	REQ_IRQ_ERR_SAFETY,
>  	REQ_IRQ_ERR_WOL,
>  	REQ_IRQ_ERR_MAC,
>  	REQ_IRQ_ERR_NO,
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
> index 686c94c2e8a7..8eac37ff002d 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
> @@ -33,6 +33,7 @@ struct stmmac_resources {
>  	int irq;
>  	int sfty_ce_irq;
>  	int sfty_ue_irq;
> +	int safety_common_irq;
>  	int rx_irq[MTL_MAX_RX_QUEUES];
>  	int tx_irq[MTL_MAX_TX_QUEUES];
>  };
> @@ -343,6 +344,7 @@ struct stmmac_priv {
>  	/* XDP BPF Program */
>  	unsigned long *af_xdp_zc_qps;
>  	struct bpf_prog *xdp_prog;
> +	int safety_common_irq;

This probably belongs with the other IRQs instead of the "XDP BPF Program"
section for readability.

>  };
>  
>  enum stmmac_state {
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index c2ac88aaffed..46a5cb20e4b4 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -3591,6 +3591,10 @@ static void stmmac_free_irq(struct net_device *dev,
>  		if (priv->wol_irq > 0 && priv->wol_irq != dev->irq)
>  			free_irq(priv->wol_irq, dev);
>  		fallthrough;
> +	case REQ_IRQ_ERR_SAFETY:
> +		if (priv->safety_common_irq > 0 && priv->safety_common_irq != dev->irq)
> +			free_irq(priv->safety_common_irq, dev);
> +		fallthrough;
>  	case REQ_IRQ_ERR_WOL:
>  		free_irq(dev->irq, dev);
>  		fallthrough;
> @@ -3797,6 +3801,18 @@ static int stmmac_request_irq_single(struct net_device *dev)
>  		}
>  	}
>  
> +	if (priv->safety_common_irq > 0 && priv->safety_common_irq != dev->irq) {
> +		ret = request_irq(priv->safety_common_irq, stmmac_safety_interrupt,
> +				  0, "safety", dev);
> +		if (unlikely(ret < 0)) {
> +			netdev_err(priv->dev,
> +				   "%s: alloc safety failed %d (error: %d)\n",
> +				   __func__, priv->safety_common_irq, ret);
> +			irq_err = REQ_IRQ_ERR_SAFETY;
> +			goto irq_error;
> +		}
> +	}
> +
>  	return 0;
>  
>  irq_error:
> @@ -7459,6 +7475,8 @@ int stmmac_dvr_probe(struct device *device,
>  	priv->lpi_irq = res->lpi_irq;
>  	priv->sfty_ce_irq = res->sfty_ce_irq;
>  	priv->sfty_ue_irq = res->sfty_ue_irq;
> +	priv->safety_common_irq = res->safety_common_irq;
> +
>  	for (i = 0; i < MTL_MAX_RX_QUEUES; i++)
>  		priv->rx_irq[i] = res->rx_irq[i];
>  	for (i = 0; i < MTL_MAX_TX_QUEUES; i++)
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index 1ffde555da47..41a4a253d75b 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -726,6 +726,15 @@ int stmmac_get_platform_resources(struct platform_device *pdev,
>  		dev_info(&pdev->dev, "IRQ eth_lpi not found\n");
>  	}
>  
> +	stmmac_res->safety_common_irq =
> +		platform_get_irq_byname_optional(pdev, "safety");
> +
> +	if (stmmac_res->safety_common_irq < 0) {
> +		if (stmmac_res->safety_common_irq == -EPROBE_DEFER)
> +			return -EPROBE_DEFER;
> +		dev_info(&pdev->dev, "IRQ safety IRQ not found\n");
> +	}
> +
>  	stmmac_res->addr = devm_platform_ioremap_resource(pdev, 0);
>  
>  	return PTR_ERR_OR_ZERO(stmmac_res->addr);
> -- 
> 2.25.1
>