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Date: Tue, 16 Aug 2022 11:06:13 +0300
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Sai Krishna Potthuri <sai.krishna.potthuri@....com>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Michal Simek <michal.simek@...inx.com>,
Borislav Petkov <bp@...en8.de>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Tony Luck <tony.luck@...el.com>,
James Morse <james.morse@....com>,
Robert Richter <rric@...nel.org>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, linux-edac@...r.kernel.org,
saikrishna12468@...il.com, git@....com,
Shubhrajyoti Datta <shubhrajyoti.datta@....com>
Subject: Re: [PATCH 2/2] edac: zynqmp_ocm: Add EDAC support for ZynqMP OCM
On 16/08/2022 10:32, Sai Krishna Potthuri wrote:
> Add EDAC support for Xilinx ZynqMP OCM Controller, this driver
> reports CE and UE errors based on the interrupts, and also creates ue/ce
> sysfs entries for error injection.
>
> Signed-off-by: Sai Krishna Potthuri <sai.krishna.potthuri@....com>
> Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@....com>
A bit confusing SoB order, although sometimes rational. Are you sure
about authorship here?
> ---
> MAINTAINERS | 7 +
> drivers/edac/Kconfig | 9 +
> drivers/edac/Makefile | 1 +
> drivers/edac/zynqmp_ocm_edac.c | 643 +++++++++++++++++++++++++++++++++
> 4 files changed, 660 insertions(+)
> create mode 100644 drivers/edac/zynqmp_ocm_edac.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index edc96cdb85e8..cd4c6c90bca3 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -21692,6 +21692,13 @@ F: Documentation/devicetree/bindings/dma/xilinx/xlnx,zynqmp-dpdma.yaml
> F: drivers/dma/xilinx/xilinx_dpdma.c
> F: include/dt-bindings/dma/xlnx-zynqmp-dpdma.h
>
> +XILINX ZYNQMP OCM EDAC DRIVER
> +M: Shubhrajyoti Datta <shubhrajyoti.datta@....com>
> +M: Sai Krishna Potthuri <sai.krishna.potthuri@....com>
> +S: Maintained
> +F: Documentation/devicetree/bindings/edac/xlnx,zynqmp-ocmc.yaml
> +F: drivers/edac/zynqmp_ocm_edac.c
> +
> XILINX ZYNQMP PSGTR PHY DRIVER
> M: Anurag Kumar Vulisha <anurag.kumar.vulisha@...inx.com>
> M: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
> index 58ab63642e72..fece60f586af 100644
> --- a/drivers/edac/Kconfig
> +++ b/drivers/edac/Kconfig
> @@ -539,4 +539,13 @@ config EDAC_DMC520
> Support for error detection and correction on the
> SoCs with ARM DMC-520 DRAM controller.
>
> +config EDAC_ZYNQMP_OCM
> + tristate "Xilinx ZynqMP OCM Controller"
> + depends on ARCH_ZYNQMP
|| COMPILE_TEST
> + help
> + Support for error de
> +/**
> + * zynqmp_ocm_edac_get_eccstate - Return the controller ecc status
> + * @base: Pointer to the ddr memory controller base address
> + *
> + * Get the ECC enable/disable status for the controller
> + *
> + * Return: ecc status 0/1.
> + */
> +static bool zynqmp_ocm_edac_get_eccstate(void __iomem *base)
> +{
> + return readl(base + ECC_CTRL_OFST) & OCM_ECC_ENABLE_MASK;
> +}
> +
> +static const struct of_device_id zynqmp_ocm_edac_match[] = {
> + { .compatible = "xlnx,zynqmp-ocmc-1.0"},
> + { /* end of table */ }
> +};
> +
> +MODULE_DEVICE_TABLE(of, zynqmp_ocm_edac_match);
This goes to the end. Do not embed static variables in the middle of the
code.
> +
> +/**
> + * zynqmp_set_ocm_edac_sysfs_attributes - create sysfs attributes
> + * @edac_dev: Pointer to the edac device struct
> + *
> + * Creates sysfs entries for error injection
> + */
> +static void zynqmp_set_ocm_edac_sysfs_attributes(struct edac_device_ctl_info
> + *edac_dev)
> +{
> + edac_dev->sysfs_attributes = zynqmp_ocm_edac_sysfs_attributes;
> +}
> +
> +/**
> + * zynqmp_ocm_edac_probe - Check controller and bind driver
> + * @pdev: Pointer to the platform_device struct
> + *
> + * Probes a specific controller instance for binding with the driver.
> + *
> + * Return: 0 if the controller instance was successfully bound to the
> + * driver; otherwise error code.
> + */
Drop the kerneldoc for probe(). It's obvious and exactly the same
everywhere. You could keep it if you write something different than theh
same message for 1000 other probes.
> +static int zynqmp_ocm_edac_probe(struct platform_device *pdev)
> +{
> + struct zynqmp_ocm_edac_priv *priv;
> + struct edac_device_ctl_info *dci;
> + void __iomem *baseaddr;
> + struct resource *res;
> + int irq, ret;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + baseaddr = devm_ioremap_resource(&pdev->dev, res);
There is a wrapper for these.
> + if (IS_ERR(baseaddr))
> + return PTR_ERR(baseaddr);
> +
> + if (!zynqmp_ocm_edac_get_eccstate(baseaddr)) {
> + edac_printk(KERN_INFO, EDAC_DEVICE,
> + "ECC not enabled - Disabling EDAC driver\n");
How do you disable the driver? What if there are two devices - how does
this disables the driver for second device?
> + return -ENXIO;
> + }
> +
> + dci = edac_device_alloc_ctl_info(sizeof(*priv), ZYNQMP_OCM_EDAC_STRING,
> + 1, ZYNQMP_OCM_EDAC_STRING, 1, 0, NULL, 0,
> + edac_device_alloc_index());
> + if (!dci) {
> + edac_printk(KERN_ERR, EDAC_DEVICE,
> + "Unable to allocate EDAC device\n");
No ENOMEM prints.
> + return -ENOMEM;
> + }
> +
> + priv = dci->pvt_info;
> + platform_set_drvdata(pdev, dci);
> + dci->dev = &pdev->dev;
> + priv->baseaddr = baseaddr;
> + dci->mod_name = pdev->dev.driver->name;
> + dci->ctl_name = ZYNQMP_OCM_EDAC_STRING;
> + dci->dev_name = dev_name(&pdev->dev);
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0) {
> + edac_printk(KERN_ERR, EDAC_DEVICE,
> + "No irq %d in DT\n", irq);
The same, no need for printks. Core does it.
> + ret = irq;
> + goto free_dev_ctl;
> + }
> +
> + ret = devm_request_irq(&pdev->dev, irq,
> + zynqmp_ocm_edac_intr_handler,
> + 0, dev_name(&pdev->dev), dci);
> + if (ret) {
> + edac_printk(KERN_ERR, EDAC_DEVICE, "Failed to request Irq\n");
> + goto free_dev_ctl;
> + }
> +
> + writel(OCM_CEUE_MASK, priv->baseaddr + OCM_IEN_OFST);
> +
> + zynqmp_set_ocm_edac_sysfs_attributes(dci);
> + ret = edac_device_add_device(dci);
> + if (ret)
> + goto free_dev_ctl;
> +
> + return 0;
> +
> +free_dev_ctl:
> + edac_device_free_ctl_info(dci);
> +
> + return ret;
> +}
> +
> +/**
> + * zynqmp_ocm_edac_remove - Unbind driver from controller
> + * @pdev: Pointer to the platform_device struct
> + *
> + * Return: Unconditionally 0
> + */
Same comment for kerneldoc.
> +static int zynqmp_ocm_edac_remove(struct platform_device *pdev)
> +{
> + struct edac_device_ctl_info *dci = platform_get_drvdata(pdev);
> + struct zynqmp_ocm_edac_priv *priv = dci->pvt_info;
> +
> + writel(OCM_CEUE_MASK, priv->baseaddr + OCM_IDS_OFST);
> + edac_device_del_device(&pdev->dev);
> + edac_device_free_ctl_info(dci);
> +
> + return 0;
> +}
> +
> +static struct platform_driver zynqmp_ocm_edac_driver = {
> + .driver = {
> + .name = "zynqmp-ocm-edac",
> + .of_match_table = zynqmp_ocm_edac_match,
> + },
> + .probe = zynqmp_ocm_edac_probe,
> + .remove = zynqmp_ocm_edac_remove,
> +};
> +
> +module_platform_driver(zynqmp_ocm_edac_driver);
> +
> +MODULE_AUTHOR("Advanced Micro Devices, Inc");
> +MODULE_DESCRIPTION("ZynqMP OCM ECC driver");
> +MODULE_LICENSE("GPL");
Best regards,
Krzysztof
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