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Date: Fri, 11 Dec 2020 11:34:26 +0000
From: "Kelly, Seamus" <seamus.kelly@...el.com>
To: Joe Perches <joe@...ches.com>,
"mgross@...ux.intel.com" <mgross@...ux.intel.com>,
"markgross@...nel.org" <markgross@...nel.org>,
"arnd@...db.de" <arnd@...db.de>, "bp@...e.de" <bp@...e.de>,
"damien.lemoal@....com" <damien.lemoal@....com>,
"dragan.cvetic@...inx.com" <dragan.cvetic@...inx.com>,
"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
"corbet@....net" <corbet@....net>,
"leonard.crestez@....com" <leonard.crestez@....com>,
"palmerdabbelt@...gle.com" <palmerdabbelt@...gle.com>,
"paul.walmsley@...ive.com" <paul.walmsley@...ive.com>,
"peng.fan@....com" <peng.fan@....com>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
"shawnguo@...nel.org" <shawnguo@...nel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 21/22] xlink-core: add async channel and events
-----Original Message-----
From: Joe Perches <joe@...ches.com>
Sent: Monday, December 7, 2020 2:55 AM
To: mgross@...ux.intel.com; markgross@...nel.org; arnd@...db.de; bp@...e.de; damien.lemoal@....com; dragan.cvetic@...inx.com; gregkh@...uxfoundation.org; corbet@....net; leonard.crestez@....com; palmerdabbelt@...gle.com; paul.walmsley@...ive.com; peng.fan@....com; robh+dt@...nel.org; shawnguo@...nel.org
Cc: linux-kernel@...r.kernel.org; Kelly, Seamus <seamus.kelly@...el.com>
Subject: Re: [PATCH 21/22] xlink-core: add async channel and events
On Tue, 2020-12-01 at 14:35 -0800, mgross@...ux.intel.com wrote:
> Enable asynchronous channel and event communication.
[]
> diff --git a/drivers/misc/xlink-core/xlink-core.c
> b/drivers/misc/xlink-core/xlink-core.c
[]
> +
> +// sysfs attribute functions
> +
> +static ssize_t event0_show(struct device *dev, struct
> +device_attribute *attr, char *buf) {
> + struct keembay_xlink_dev *xlink_dev = dev_get_drvdata(dev);
> + struct xlink_attr *a = &xlink_dev->eventx[0];
> +
> + return scnprintf(buf, PAGE_SIZE, "0x%x 0x%lx\n", a->sw_dev_id,
> +a->value); }
> +
> +static ssize_t event1_show(struct device *dev, struct
> +device_attribute *attr, char *buf) {
> + struct keembay_xlink_dev *xlink_dev = dev_get_drvdata(dev);
> + struct xlink_attr *a = &xlink_dev->eventx[1];
> +
> + return scnprintf(buf, PAGE_SIZE, "0x%x 0x%lx\n", a->sw_dev_id,
> +a->value); }
> +
> +static ssize_t event2_show(struct device *dev, struct
> +device_attribute *attr, char *buf) {
> + struct keembay_xlink_dev *xlink_dev = dev_get_drvdata(dev);
> + struct xlink_attr *a = &xlink_dev->eventx[2];
> +
> + return scnprintf(buf, PAGE_SIZE, "0x%x 0x%lx\n", a->sw_dev_id,
> +a->value); }
> +
> +static ssize_t event3_show(struct device *dev, struct
> +device_attribute *attr, char *buf) {
> + struct keembay_xlink_dev *xlink_dev = dev_get_drvdata(dev);
> + struct xlink_attr *a = &xlink_dev->eventx[3];
> +
> + return scnprintf(buf, PAGE_SIZE, "0x%x 0x%lx\n", a->sw_dev_id,
> +a->value); }
These could use the sysfs_emit function and not scnprintf and as well could use a single shared function with an index.
Something like:
static ssize_t eventx_show(struct device *dev, struct device_attr *attr, int index, char *buf) {
struct keembay_xlink_dev *xlink_dev = dev_get_drvdata(dev);
struct xlink_attr *a = &xlink_dev->eventx[index];
return sysfs_emit(buf, "0x%x 0x%lx\n", a->sw_dev_id, a->value); }
static ssize_t event0_show(struct device *dev, struct device_attribute *attr, char *buf) {
return eventx_show(dev, attr, 0, buf);
}
etc...
[Kelly, Seamus] Thank you! will do.
> @@ -270,19 +353,23 @@ static long xlink_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
> struct xlinkconnect con = {0};
> struct xlinkrelease rel = {0};
> struct xlinkstartvpu startvpu = {0};
> + struct xlinkcallback cb = {0};
> struct xlinkgetdevicename devn = {0};
> struct xlinkgetdevicelist devl = {0};
> struct xlinkgetdevicestatus devs = {0};
> struct xlinkbootdevice boot = {0};
> struct xlinkresetdevice res = {0};
> struct xlinkdevmode devm = {0};
> + struct xlinkregdevevent regdevevent = {0};
Perhaps significantly less stack would be used if these declarations were moved into the case blocks where used. Less initialization would be done per ioctl too.
[Kelly, Seamus] This has changed significantly In next patch and I take your comments ( on next patch also ) Thanks
> @@ -318,6 +405,30 @@ static long xlink_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
> if (copy_to_user((void __user *)op.return_code, (void *)&rc, sizeof(rc)))
> return -EFAULT;
> break;
> + case XL_DATA_READY_CALLBACK:
> + if (copy_from_user(&cb, (void __user *)arg,
> + sizeof(struct xlinkcallback)))
> + return -EFAULT;
> + if (copy_from_user(&devh, (void __user *)cb.handle,
> + sizeof(struct xlink_handle)))
> + return -EFAULT;
> + CHANNEL_SET_USER_BIT(cb.chan); // set MSbit for user space call
> + rc = xlink_data_available_event(&devh, cb.chan, cb.callback);
> + if (copy_to_user((void __user *)cb.return_code, (void *)&rc, sizeof(rc)))
> + return -EFAULT;
> + break;
case XL_DATA_READY_CALLBACK: {
struct xlinkcallback cb = {};
etc...
break;
}
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