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SubjectRe: [PATCH 4/7] fpga: dfl: afu: add interrupt support for error reporting
On Mon, Mar 09, 2020 at 06:29:47PM +0800, Xu Yilun wrote:
> Error reporting interrupt is very useful to notify users that some
> errors are detected by the hardware. Once users are notified, they
> could query hardware logged error states, no need to continuously
> poll on these states.
>
> This patch follows the common DFL interrupt notification and handling
> mechanism, implements two ioctl commands below for user to query
> hardware capability, and set/unset interrupt triggers.
>
> Ioctls:
> * DFL_FPGA_PORT_ERR_GET_INFO
> get error reporting feature info, including num_irqs which is used to
> determine whether/how many interrupts it supports.
>
> * DFL_FPGA_PORT_ERR_SET_IRQ
> set/unset given eventfds as error interrupt triggers.
>
> Signed-off-by: Luwei Kang <luwei.kang@intel.com>
> Signed-off-by: Wu Hao <hao.wu@intel.com>
> Signed-off-by: Xu Yilun <yilun.xu@intel.com>
> ---
> drivers/fpga/dfl-afu-error.c | 69 +++++++++++++++++++++++++++++++++++++++++++
> drivers/fpga/dfl-afu-main.c | 4 +++
> include/uapi/linux/fpga-dfl.h | 34 +++++++++++++++++++++
> 3 files changed, 107 insertions(+)
>
> diff --git a/drivers/fpga/dfl-afu-error.c b/drivers/fpga/dfl-afu-error.c
> index c1467ae..a2c5454 100644
> --- a/drivers/fpga/dfl-afu-error.c
> +++ b/drivers/fpga/dfl-afu-error.c
> @@ -15,6 +15,7 @@
> */
>
> #include <linux/uaccess.h>
> +#include <linux/fpga-dfl.h>
>
> #include "dfl-afu.h"
>
> @@ -219,6 +220,73 @@ static void port_err_uinit(struct platform_device *pdev,
> afu_port_err_mask(&pdev->dev, true);
> }
>
> +static long
> +port_err_get_info(struct platform_device *pdev,
> + struct dfl_feature *feature, unsigned long arg)
> +{
> + struct dfl_fpga_port_err_info info;
> +
> + info.flags = 0;
> + info.capability = 0;

as flags and capability are not used at this moment, so actually it only exposes
irq information to user. I understand flags and capability are used for
future extension, but it may not work without argsz, as we never know what
comes next, e.g. a capability requires > 32bit can't fit into this ioctl.
So maybe just a ioctl for IRQ_INFO is enough for now.

How do you think?

> + info.num_irqs = feature->nr_irqs;
> +
> + if (copy_to_user((void __user *)arg, &info, sizeof(info)))
> + return -EFAULT;
> +
> + return 0;
> +}
> +
> +static long port_err_set_irq(struct platform_device *pdev,
> + struct dfl_feature *feature, unsigned long arg)
> +{
> + struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
> + struct dfl_fpga_irq_set hdr;
> + s32 *fds;
> + long ret;
> +
> + if (!feature->nr_irqs)
> + return -ENOENT;
> +
> + if (copy_from_user(&hdr, (void __user *)arg, sizeof(hdr)))
> + return -EFAULT;
> +
> + if (hdr.flags || (hdr.start + hdr.count > feature->nr_irqs) ||
> + (hdr.start + hdr.count < hdr.start) || !hdr.count)
> + return -EINVAL;
> +
> + fds = memdup_user((void __user *)(arg + sizeof(hdr)),
> + hdr.count * sizeof(s32));
> + if (IS_ERR(fds))
> + return PTR_ERR(fds);
> +
> + mutex_lock(&pdata->lock);
> + ret = dfl_fpga_set_irq_triggers(feature, hdr.start, hdr.count, fds);
> + mutex_unlock(&pdata->lock);
> +
> + kfree(fds);
> + return ret;
> +}
> +
> +static long
> +port_err_ioctl(struct platform_device *pdev, struct dfl_feature *feature,
> + unsigned int cmd, unsigned long arg)
> +{
> + long ret = -ENODEV;
> +
> + switch (cmd) {
> + case DFL_FPGA_PORT_ERR_GET_INFO:
> + ret = port_err_get_info(pdev, feature, arg);
> + break;
> + case DFL_FPGA_PORT_ERR_SET_IRQ:
> + ret = port_err_set_irq(pdev, feature, arg);
> + break;
> + default:
> + dev_dbg(&pdev->dev, "%x cmd not handled", cmd);
> + }
> +
> + return ret;
> +}
> +
> const struct dfl_feature_id port_err_id_table[] = {
> {.id = PORT_FEATURE_ID_ERROR,},
> {0,}
> @@ -227,4 +295,5 @@ const struct dfl_feature_id port_err_id_table[] = {
> const struct dfl_feature_ops port_err_ops = {
> .init = port_err_init,
> .uinit = port_err_uinit,
> + .ioctl = port_err_ioctl,
> };
> diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c
> index 435bde4..fc8b9cf 100644
> --- a/drivers/fpga/dfl-afu-main.c
> +++ b/drivers/fpga/dfl-afu-main.c
> @@ -577,6 +577,7 @@ static int afu_release(struct inode *inode, struct file *filp)
> {
> struct platform_device *pdev = filp->private_data;
> struct dfl_feature_platform_data *pdata;
> + struct dfl_feature *feature;
>
> dev_dbg(&pdev->dev, "Device File Release\n");
>
> @@ -586,6 +587,9 @@ static int afu_release(struct inode *inode, struct file *filp)
> dfl_feature_dev_use_end(pdata);
>
> if (!dfl_feature_dev_use_count(pdata)) {
> + dfl_fpga_dev_for_each_feature(pdata, feature)
> + dfl_fpga_set_irq_triggers(feature, 0,
> + feature->nr_irqs, NULL);
> __port_reset(pdev);
> afu_dma_region_destroy(pdata);
> }
> diff --git a/include/uapi/linux/fpga-dfl.h b/include/uapi/linux/fpga-dfl.h
> index ec70a0746..846fc91 100644
> --- a/include/uapi/linux/fpga-dfl.h
> +++ b/include/uapi/linux/fpga-dfl.h
> @@ -151,6 +151,40 @@ struct dfl_fpga_port_dma_unmap {
>
> #define DFL_FPGA_PORT_DMA_UNMAP _IO(DFL_FPGA_MAGIC, DFL_PORT_BASE + 4)
>
> +/**
> + * DFL_FPGA_PORT_ERR_GET_INFO - _IOR(DFL_FPGA_MAGIC, DFL_PORT_BASE + 5,
> + * struct dfl_fpga_port_err_info)
> + *
> + * Retrieve information about the fpga port error reporting private feature.
> + * Driver fills the info in provided struct dfl_fpga_port_err_info.
> + * Return: 0 on success, -errno on failure.
> + */
> +struct dfl_fpga_port_err_info {
> + /* Output */
> + __u32 flags; /* Zero for now */
> + __u32 capability; /* The capability of port error reporting */
> + __u32 num_irqs; /* number of irqs it supports */
> +};
> +
> +#define DFL_FPGA_PORT_ERR_GET_INFO _IO(DFL_FPGA_MAGIC, DFL_PORT_BASE + 5)
> +
> +/**
> + * DFL_FPGA_PORT_ERR_SET_IRQ - _IOW(DFL_FPGA_MAGIC, DFL_PORT_BASE + 6,
> + * struct dfl_fpga_irq_set)
> + *
> + * Set fpga port error reporting interrupt trigger if evtfds[n] is valid.
> + * Unset related interrupt trigger if evtfds[n] is a negative value.
> + * Return: 0 on success, -errno on failure.
> + */
> +struct dfl_fpga_irq_set {
> + __u32 flags; /* Zero for now */
> + __u32 start; /* First irq number */
> + __u32 count; /* The number of eventfd handler */
> + __s32 evtfds[]; /* Eventfd handler */
> +};
> +
> +#define DFL_FPGA_PORT_ERR_SET_IRQ _IO(DFL_FPGA_MAGIC, DFL_PORT_BASE + 6)
> +
> /* IOCTLs for FME file descriptor */
>
> /**
> --
> 2.7.4

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