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Date: Tue, 19 Mar 2019 15:54:19 +0800
From: Chunfeng Yun <chunfeng.yun@...iatek.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC: Felipe Balbi <balbi@...nel.org>,
Mathias Nyman <mathias.nyman@...el.com>,
Joel Stanley <joel@....id.au>,
Andrew Jeffery <andrew@...id.au>,
Matthias Brugger <matthias.bgg@...il.com>,
"Yoshihiro Shimoda" <yoshihiro.shimoda.uh@...esas.com>,
Arnd Bergmann <arnd@...db.de>, Roger Quadros <rogerq@...com>,
Alan Stern <stern@...land.harvard.edu>,
"Gustavo A. R. Silva" <gustavo@...eddedor.com>,
Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Miquel Raynal <miquel.raynal@...tlin.com>,
"Dmitry Torokhov" <dtor@...omium.org>,
Johan Hovold <johan@...nel.org>,
"Benjamin Herrenschmidt" <benh@...nel.crashing.org>,
Colin Ian King <colin.king@...onical.com>,
Matteo Croce <mcroce@...hat.com>, <linux-usb@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-aspeed@...ts.ozlabs.org>,
<linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v2] usb: introduce usb_ep_type_string() function
Hi Felipe & Mathias,
Could you please comment this patch, if there is some-effect on dwc3 and
xhci, I'll remove its change.
Sorry for bothering you
On Tue, 2019-03-19 at 15:44 +0800, Chunfeng Yun wrote:
> In some places, the code prints a human-readable USB endpoint
> transfer type (e.g. "Bulk"). This involves a switch statement
> sometimes wrapped around in ({ ... }) block leading to code
> repetition.
> To make this scenario easier, here introduces usb_ep_type_string()
> function, which returns a human-readable name of provided
> endpoint type.
> It also changes a few places switch was used to use this
> new function.
>
> Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> ---
> v2 changes:
> 1. keep type string consistent with type_show() used in endpoint.c
> ---
> drivers/usb/common/common.c | 16 ++++++++++++++++
> drivers/usb/core/endpoint.c | 18 ++----------------
> drivers/usb/core/hcd.c | 17 ++---------------
> drivers/usb/dwc3/debugfs.c | 23 ++++-------------------
> drivers/usb/gadget/udc/aspeed-vhub/epn.c | 6 +-----
> drivers/usb/gadget/udc/dummy_hcd.c | 16 +---------------
> drivers/usb/host/xhci-trace.h | 19 ++-----------------
> include/linux/usb/ch9.h | 8 ++++++++
> 8 files changed, 36 insertions(+), 87 deletions(-)
>
> diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
> index 48277bbc15e4..529b01e786fd 100644
> --- a/drivers/usb/common/common.c
> +++ b/drivers/usb/common/common.c
> @@ -16,6 +16,22 @@
> #include <linux/usb/otg.h>
> #include <linux/of_platform.h>
>
> +static const char *const ep_type_names[] = {
> + [USB_ENDPOINT_XFER_CONTROL] = "Control",
> + [USB_ENDPOINT_XFER_ISOC] = "Isoc",
> + [USB_ENDPOINT_XFER_BULK] = "Bulk",
> + [USB_ENDPOINT_XFER_INT] = "Interrupt",
> +};
> +
> +const char *usb_ep_type_string(int ep_type)
> +{
> + if (ep_type < 0 || ep_type >= ARRAY_SIZE(ep_type_names))
> + return "unknown";
> +
> + return ep_type_names[ep_type];
> +}
> +EXPORT_SYMBOL_GPL(usb_ep_type_string);
> +
> const char *usb_otg_state_string(enum usb_otg_state state)
> {
> static const char *const names[] = {
> diff --git a/drivers/usb/core/endpoint.c b/drivers/usb/core/endpoint.c
> index 1c2c04079676..afa43f9a47b2 100644
> --- a/drivers/usb/core/endpoint.c
> +++ b/drivers/usb/core/endpoint.c
> @@ -60,23 +60,9 @@ static ssize_t type_show(struct device *dev, struct device_attribute *attr,
> char *buf)
> {
> struct ep_device *ep = to_ep_device(dev);
> - char *type = "unknown";
> + int ep_type = usb_endpoint_type(ep->desc);
>
> - switch (usb_endpoint_type(ep->desc)) {
> - case USB_ENDPOINT_XFER_CONTROL:
> - type = "Control";
> - break;
> - case USB_ENDPOINT_XFER_ISOC:
> - type = "Isoc";
> - break;
> - case USB_ENDPOINT_XFER_BULK:
> - type = "Bulk";
> - break;
> - case USB_ENDPOINT_XFER_INT:
> - type = "Interrupt";
> - break;
> - }
> - return sprintf(buf, "%s\n", type);
> + return sprintf(buf, "%s\n", usb_ep_type_string(ep_type));
> }
> static DEVICE_ATTR_RO(type);
>
> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
> index 3189181bb628..0ccf2efeb40b 100644
> --- a/drivers/usb/core/hcd.c
> +++ b/drivers/usb/core/hcd.c
> @@ -1878,23 +1878,10 @@ void usb_hcd_flush_endpoint(struct usb_device *udev,
> /* kick hcd */
> unlink1(hcd, urb, -ESHUTDOWN);
> dev_dbg (hcd->self.controller,
> - "shutdown urb %pK ep%d%s%s\n",
> + "shutdown urb %pK ep%d%s-%s\n",
> urb, usb_endpoint_num(&ep->desc),
> is_in ? "in" : "out",
> - ({ char *s;
> -
> - switch (usb_endpoint_type(&ep->desc)) {
> - case USB_ENDPOINT_XFER_CONTROL:
> - s = ""; break;
> - case USB_ENDPOINT_XFER_BULK:
> - s = "-bulk"; break;
> - case USB_ENDPOINT_XFER_INT:
> - s = "-intr"; break;
> - default:
> - s = "-iso"; break;
> - };
> - s;
> - }));
> + usb_ep_type_string(usb_endpoint_type(&ep->desc)));
> usb_put_urb (urb);
>
> /* list contents may have changed */
> diff --git a/drivers/usb/dwc3/debugfs.c b/drivers/usb/dwc3/debugfs.c
> index 1c792710348f..d9e2a63835fe 100644
> --- a/drivers/usb/dwc3/debugfs.c
> +++ b/drivers/usb/dwc3/debugfs.c
> @@ -750,28 +750,13 @@ static int dwc3_transfer_type_show(struct seq_file *s, void *unused)
> unsigned long flags;
>
> spin_lock_irqsave(&dwc->lock, flags);
> - if (!(dep->flags & DWC3_EP_ENABLED) ||
> - !dep->endpoint.desc) {
> - seq_printf(s, "--\n");
> + if (!(dep->flags & DWC3_EP_ENABLED) || !dep->endpoint.desc) {
> + seq_puts(s, "unknown\n");
> goto out;
> }
>
> - switch (usb_endpoint_type(dep->endpoint.desc)) {
> - case USB_ENDPOINT_XFER_CONTROL:
> - seq_printf(s, "control\n");
> - break;
> - case USB_ENDPOINT_XFER_ISOC:
> - seq_printf(s, "isochronous\n");
> - break;
> - case USB_ENDPOINT_XFER_BULK:
> - seq_printf(s, "bulk\n");
> - break;
> - case USB_ENDPOINT_XFER_INT:
> - seq_printf(s, "interrupt\n");
> - break;
> - default:
> - seq_printf(s, "--\n");
> - }
> + seq_printf(s, "%s\n",
> + usb_ep_type_string(usb_endpoint_type(dep->endpoint.desc)));
>
> out:
> spin_unlock_irqrestore(&dwc->lock, flags);
> diff --git a/drivers/usb/gadget/udc/aspeed-vhub/epn.c b/drivers/usb/gadget/udc/aspeed-vhub/epn.c
> index 83340f4fdc6e..35941dc125f9 100644
> --- a/drivers/usb/gadget/udc/aspeed-vhub/epn.c
> +++ b/drivers/usb/gadget/udc/aspeed-vhub/epn.c
> @@ -593,10 +593,6 @@ static int ast_vhub_epn_disable(struct usb_ep* u_ep)
> static int ast_vhub_epn_enable(struct usb_ep* u_ep,
> const struct usb_endpoint_descriptor *desc)
> {
> - static const char *ep_type_string[] __maybe_unused = { "ctrl",
> - "isoc",
> - "bulk",
> - "intr" };
> struct ast_vhub_ep *ep = to_ast_ep(u_ep);
> struct ast_vhub_dev *dev;
> struct ast_vhub *vhub;
> @@ -646,7 +642,7 @@ static int ast_vhub_epn_enable(struct usb_ep* u_ep,
> ep->epn.wedged = false;
>
> EPDBG(ep, "Enabling [%s] %s num %d maxpacket=%d\n",
> - ep->epn.is_in ? "in" : "out", ep_type_string[type],
> + ep->epn.is_in ? "in" : "out", usb_ep_type_string(type),
> usb_endpoint_num(desc), maxpacket);
>
> /* Can we use DMA descriptor mode ? */
> diff --git a/drivers/usb/gadget/udc/dummy_hcd.c b/drivers/usb/gadget/udc/dummy_hcd.c
> index baf72f95f0f1..40c6a484e232 100644
> --- a/drivers/usb/gadget/udc/dummy_hcd.c
> +++ b/drivers/usb/gadget/udc/dummy_hcd.c
> @@ -617,21 +617,7 @@ static int dummy_enable(struct usb_ep *_ep,
> _ep->name,
> desc->bEndpointAddress & 0x0f,
> (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
> - ({ char *val;
> - switch (usb_endpoint_type(desc)) {
> - case USB_ENDPOINT_XFER_BULK:
> - val = "bulk";
> - break;
> - case USB_ENDPOINT_XFER_ISOC:
> - val = "iso";
> - break;
> - case USB_ENDPOINT_XFER_INT:
> - val = "intr";
> - break;
> - default:
> - val = "ctrl";
> - break;
> - } val; }),
> + usb_ep_type_string(usb_endpoint_type(desc)),
> max, ep->stream_en ? "enabled" : "disabled");
>
> /* at this point real hardware should be NAKing transfers
> diff --git a/drivers/usb/host/xhci-trace.h b/drivers/usb/host/xhci-trace.h
> index 88b427434bd8..bac73d688f11 100644
> --- a/drivers/usb/host/xhci-trace.h
> +++ b/drivers/usb/host/xhci-trace.h
> @@ -289,23 +289,8 @@ DECLARE_EVENT_CLASS(xhci_log_urb,
> ),
> TP_printk("ep%d%s-%s: urb %p pipe %u slot %d length %d/%d sgs %d/%d stream %d flags %08x",
> __entry->epnum, __entry->dir_in ? "in" : "out",
> - ({ char *s;
> - switch (__entry->type) {
> - case USB_ENDPOINT_XFER_INT:
> - s = "intr";
> - break;
> - case USB_ENDPOINT_XFER_CONTROL:
> - s = "control";
> - break;
> - case USB_ENDPOINT_XFER_BULK:
> - s = "bulk";
> - break;
> - case USB_ENDPOINT_XFER_ISOC:
> - s = "isoc";
> - break;
> - default:
> - s = "UNKNOWN";
> - } s; }), __entry->urb, __entry->pipe, __entry->slot_id,
> + usb_ep_type_string(__entry->type),
> + __entry->urb, __entry->pipe, __entry->slot_id,
> __entry->actual, __entry->length, __entry->num_mapped_sgs,
> __entry->num_sgs, __entry->stream, __entry->flags
> )
> diff --git a/include/linux/usb/ch9.h b/include/linux/usb/ch9.h
> index 523aa088f6ab..da82606be605 100644
> --- a/include/linux/usb/ch9.h
> +++ b/include/linux/usb/ch9.h
> @@ -36,6 +36,14 @@
> #include <linux/device.h>
> #include <uapi/linux/usb/ch9.h>
>
> +/**
> + * usb_ep_type_string() - Returns human readable-name of the endpoint type.
> + * @ep_type: The endpoint type to return human-readable name for. If it's not
> + * any of the types: USB_ENDPOINT_XFER_{CONTROL, ISOC, BULK, INT},
> + * usually got by usb_endpoint_type(), the string 'unknown' will be returned.
> + */
> +extern const char *usb_ep_type_string(int ep_type);
> +
> /**
> * usb_speed_string() - Returns human readable-name of the speed.
> * @speed: The speed to return human-readable name for. If it's not
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