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Message-ID: <20200319142544.GC2474@yilunxu-OptiPlex-7050>
Date: Thu, 19 Mar 2020 22:25:44 +0800
From: Xu Yilun <yilun.xu@...el.com>
To: Wu Hao <hao.wu@...el.com>
Cc: mdf@...nel.org, linux-fpga@...r.kernel.org,
linux-kernel@...r.kernel.org, Luwei Kang <luwei.kang@...el.com>
Subject: Re: [PATCH v2 4/7] fpga: dfl: afu: add interrupt support for error
reporting
On Wed, Mar 18, 2020 at 04:54:26PM +0800, Wu Hao wrote:
> On Mon, Mar 16, 2020 at 12:16:59PM +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
> > number of irqs supported, and set/unset interrupt triggers.
> >
> > Ioctls:
> > * DFL_FPGA_PORT_ERR_GET_IRQ_NUM
> > get the number of irqs, which is used to determine whether/how many
> > interrupts error reporting feature supports.
> >
> > * DFL_FPGA_PORT_ERR_SET_IRQ
> > set/unset given eventfds as error interrupt triggers.
> >
> > Signed-off-by: Luwei Kang <luwei.kang@...el.com>
> > Signed-off-by: Wu Hao <hao.wu@...el.com>
> > Signed-off-by: Xu Yilun <yilun.xu@...el.com>
> > ----
> > v2: use DFL_FPGA_PORT_ERR_GET_IRQ_NUM instead of
> > DFL_FPGA_PORT_ERR_GET_INFO
> > Delete flag field for DFL_FPGA_PORT_ERR_SET_IRQ param
> > ---
> > drivers/fpga/dfl-afu-error.c | 64 +++++++++++++++++++++++++++++++++++++++++++
> > drivers/fpga/dfl-afu-main.c | 4 +++
> > include/uapi/linux/fpga-dfl.h | 29 ++++++++++++++++++++
> > 3 files changed, 97 insertions(+)
> >
> > diff --git a/drivers/fpga/dfl-afu-error.c b/drivers/fpga/dfl-afu-error.c
> > index c1467ae..4d478b2f 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 +220,68 @@ static void port_err_uinit(struct platform_device *pdev,
> > afu_port_err_mask(&pdev->dev, true);
> > }
> >
> > +static long
> > +port_err_get_num_irqs(struct platform_device *pdev,
> > + struct dfl_feature *feature, unsigned long arg)
> > +{
> > + if (copy_to_user((void __user *)arg, &feature->nr_irqs,
> > + sizeof(feature->nr_irqs)))
> > + return -EFAULT;
>
> maybe use put_user is simpler here.
I'll change it.
>
> > +
> > + 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.count || (hdr.start + hdr.count > feature->nr_irqs) ||
> > + (hdr.start + hdr.count < hdr.start))
> > + 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_IRQ_NUM:
> > + ret = port_err_get_num_irqs(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 +290,5 @@ 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..ced859d 100644
> > --- a/include/uapi/linux/fpga-dfl.h
> > +++ b/include/uapi/linux/fpga-dfl.h
> > @@ -151,6 +151,35 @@ 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_IRQ_NUM - _IOR(DFL_FPGA_MAGIC, DFL_PORT_BASE + 5,
> > + * __u32 num_irqs)
> > + *
> > + * Get the number of irqs supported by the fpga port error reporting private
> > + * feature.
> > + * Return: 0 on success, -errno on failure.
> > + */
> > +#define DFL_FPGA_PORT_ERR_GET_IRQ_NUM _IOR(DFL_FPGA_MAGIC, \
> > + DFL_PORT_BASE + 5, __u32)
> > +
> > +/**
> > + * 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 NULL or negative value.
>
> Looks like the code only unset trigger if fd < 0, right?
Yes, will fix it.
>
> > + * Return: 0 on success, -errno on failure.
> > + */
> > +struct dfl_fpga_irq_set {
> > + __u32 start; /* First irq number */
>
> Sounds a little confusing, what about index of the first irq?
I'll take this change.
Thanks.
>
>
> Thanks
> Hao
>
> > + __u32 count; /* The number of eventfd handler */
> > + __s32 evtfds[]; /* Eventfd handler */
> > +};
> > +
> > +#define DFL_FPGA_PORT_ERR_SET_IRQ _IOW(DFL_FPGA_MAGIC, \
> > + DFL_PORT_BASE + 6, \
> > + struct dfl_fpga_irq_set)
> > +
> > /* IOCTLs for FME file descriptor */
> >
> > /**
> > --
> > 2.7.4
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