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Date: Wed, 1 Apr 2020 11:13:09 +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, trix@...hat.com, bhu@...hat.com,
Luwei Kang <luwei.kang@...el.com>
Subject: Re: [PATCH v3 6/7] fpga: dfl: afu: add user interrupt support
On Tue, Mar 31, 2020 at 01:15:50PM +0800, Wu Hao wrote:
> On Tue, Mar 24, 2020 at 04:32:42PM +0800, Xu Yilun wrote:
> > AFU (Accelerated Function Unit) is dynamic region of the DFL based FPGA,
> > and always defined by users. Some DFL based FPGA cards allow users to
> > implement their own interrupts in AFU. In order to support this,
> > hardware implements a new UINT (User Interrupt) private feature with
>
> User Interrupt seems a little confusing, maybe we can just call it
> AFU Interrupt whenever possible. How do you think?
OK. It's more clear. I'll change it.
>
> Thanks
> Hao
>
> > related capability register which describes the number of supported
> > user interrupts as well as the local index of the interrupts for
> > software enumeration, and from software side, driver follows the common
> > DFL interrupt notification and handling mechanism, and it implements
> > two ioctls below for user to query number of irqs supported and set/unset
> > interrupt triggers.
> >
> > Ioctls:
> > * DFL_FPGA_PORT_UINT_GET_IRQ_NUM
> > get the number of irqs, which is used to determine how many interrupts
> > UINT feature supports.
> >
> > * DFL_FPGA_PORT_UINT_SET_IRQ
> > set/unset eventfds as AFU user 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_UINT_GET_IRQ_NUM instead of
> > DFL_FPGA_PORT_UINT_GET_INFO
> > Delete flags field for DFL_FPGA_PORT_UINT_SET_IRQ
> > v3: put_user() instead of copy_to_user()
> > improves comments
> > ---
> > drivers/fpga/dfl-afu-main.c | 70 +++++++++++++++++++++++++++++++++++++++++++
> > include/uapi/linux/fpga-dfl.h | 23 ++++++++++++++
> > 2 files changed, 93 insertions(+)
> >
> > diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c
> > index 357cd5d..d2db5b6 100644
> > --- a/drivers/fpga/dfl-afu-main.c
> > +++ b/drivers/fpga/dfl-afu-main.c
> > @@ -529,6 +529,72 @@ static const struct dfl_feature_ops port_stp_ops = {
> > .init = port_stp_init,
> > };
> >
> > +static long
> > +port_uint_get_num_irqs(struct platform_device *pdev,
> > + struct dfl_feature *feature, unsigned long arg)
> > +{
> > + return put_user(feature->nr_irqs, (__u32 __user *)arg);
> > +}
> > +
> > +static long port_uint_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_uint_ioctl(struct platform_device *pdev, struct dfl_feature *feature,
> > + unsigned int cmd, unsigned long arg)
> > +{
> > + long ret = -ENODEV;
> > +
> > + switch (cmd) {
> > + case DFL_FPGA_PORT_UINT_GET_IRQ_NUM:
> > + ret = port_uint_get_num_irqs(pdev, feature, arg);
> > + break;
> > + case DFL_FPGA_PORT_UINT_SET_IRQ:
> > + ret = port_uint_set_irq(pdev, feature, arg);
> > + break;
> > + default:
> > + dev_dbg(&pdev->dev, "%x cmd not handled", cmd);
> > + }
> > + return ret;
> > +}
> > +
> > +static const struct dfl_feature_id port_uint_id_table[] = {
> > + {.id = PORT_FEATURE_ID_UINT,},
> > + {0,}
> > +};
> > +
> > +static const struct dfl_feature_ops port_uint_ops = {
> > + .ioctl = port_uint_ioctl,
> > +};
> > +
> > static struct dfl_feature_driver port_feature_drvs[] = {
> > {
> > .id_table = port_hdr_id_table,
> > @@ -547,6 +613,10 @@ static struct dfl_feature_driver port_feature_drvs[] = {
> > .ops = &port_stp_ops,
> > },
> > {
> > + .id_table = port_uint_id_table,
> > + .ops = &port_uint_ops,
> > + },
> > + {
> > .ops = NULL,
> > }
> > };
> > diff --git a/include/uapi/linux/fpga-dfl.h b/include/uapi/linux/fpga-dfl.h
> > index 206bad9..5f885a8 100644
> > --- a/include/uapi/linux/fpga-dfl.h
> > +++ b/include/uapi/linux/fpga-dfl.h
> > @@ -180,6 +180,29 @@ struct dfl_fpga_irq_set {
> > DFL_PORT_BASE + 6, \
> > struct dfl_fpga_irq_set)
> >
> > +/**
> > + * DFL_FPGA_PORT_UINT_GET_IRQ_NUM - _IOR(DFL_FPGA_MAGIC, DFL_PORT_BASE + 7,
> > + * __u32 num_irqs)
> > + *
> > + * Get the number of irqs supported by the fpga AFU user interrupt private
> > + * feature.
> > + * Return: 0 on success, -errno on failure.
> > + */
> > +#define DFL_FPGA_PORT_UINT_GET_IRQ_NUM _IOR(DFL_FPGA_MAGIC, \
> > + DFL_PORT_BASE + 7, __u32)
> > +
> > +/**
> > + * DFL_FPGA_PORT_UINT_SET_IRQ - _IOW(DFL_FPGA_MAGIC, DFL_PORT_BASE + 8,
> > + * struct dfl_fpga_irq_set)
> > + *
> > + * Set fpga afu user 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.
> > + */
> > +#define DFL_FPGA_PORT_UINT_SET_IRQ _IOW(DFL_FPGA_MAGIC, \
> > + DFL_PORT_BASE + 8, \
> > + struct dfl_fpga_irq_set)
> > +
> > /* IOCTLs for FME file descriptor */
> >
> > /**
> > --
> > 2.7.4
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