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Date: Mon, 27 Nov 2023 14:08:16 -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 fault IRQ Support
On Thu, Nov 23, 2023 at 05:08:15PM +0530, Suraj Jaiswal wrote:
> Add IRQ support to listen HW fault 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 | 20 +++++++++++++++++++
> 4 files changed, 41 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 cd7a9768de5f..8893d4b7fa38 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_intr;
> int rx_irq[MTL_MAX_RX_QUEUES];
> int tx_irq[MTL_MAX_TX_QUEUES];
> };
> @@ -331,6 +332,7 @@ struct stmmac_priv {
> /* XDP BPF Program */
> unsigned long *af_xdp_zc_qps;
> struct bpf_prog *xdp_prog;
> + int safety_common_intr;
> };
>
> enum stmmac_state {
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index 8964fc8a955f..2ae4f34444de 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -3530,6 +3530,10 @@ 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_intr > 0 && priv->safety_common_intr != dev->irq)
> + free_irq(priv->safety_common_intr, dev);
> + fallthrough;
> case REQ_IRQ_ERR_WOL:
> free_irq(dev->irq, dev);
> fallthrough;
> @@ -3736,6 +3740,18 @@ static int stmmac_request_irq_single(struct net_device *dev)
> }
> }
>
> + if (priv->safety_common_intr > 0 && priv->safety_common_intr != dev->irq) {
> + ret = request_irq(priv->safety_common_intr, 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_intr, ret);
> + irq_err = REQ_IRQ_ERR_SAFETY;
> + goto irq_error;
> + }
> + }
> +
> return 0;
>
> irq_error:
> @@ -7398,6 +7414,8 @@ 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_intr = res->safety_common_intr;
> +
> 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..bae1704d5f4b 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -690,9 +690,25 @@ devm_stmmac_probe_config_dt(struct platform_device *pdev, u8 *mac)
> #endif /* CONFIG_OF */
> EXPORT_SYMBOL_GPL(devm_stmmac_probe_config_dt);
>
> +int stmmac_get_fault_intr_config(struct platform_device *pdev, struct stmmac_resources *res)
> +{
> + int ret = 0;
> +
> + res->safety_common_intr = platform_get_irq_byname(pdev, "safety");
> +
> + if (res->safety_common_intr < 0) {
> + if (res->safety_common_intr != -EPROBE_DEFER)
> + dev_err(&pdev->dev, "safety IRQ configuration information not found\n");
> + ret = 1;
> + }
> +
> + return ret;
> +}
I think other reviewers have covered most of what I want to say, but
I think this doesn't deserve its own function and should just be done
directly, as is done for eth_lpi for example. I think it also should be
considered an optional interrupt based on my understanding of its
purpose (just like eth_lpi).
> +
> int stmmac_get_platform_resources(struct platform_device *pdev,
> struct stmmac_resources *stmmac_res)
> {
> + int ret = 0;
> memset(stmmac_res, 0, sizeof(*stmmac_res));
>
> /* Get IRQ information early to have an ability to ask for deferred
> @@ -702,6 +718,10 @@ int stmmac_get_platform_resources(struct platform_device *pdev,
> if (stmmac_res->irq < 0)
> return stmmac_res->irq;
>
> + ret = stmmac_get_fault_intr_config(pdev, stmmac_res);
> + if (ret)
> + dev_err(&pdev->dev, "Fault interrupt not present\n");
> +
> /* On some platforms e.g. SPEAr the wake up irq differs from the mac irq
> * The external wake up irq can be passed through the platform code
> * named as "eth_wake_irq"
> --
> 2.25.1
>
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