From: Jussi Kivilinna <jussi.kivilinna@iki.fi>
To: linux-usb@vger.kernel.org
Cc: Oliver Neukum <oliver@neukum.org>,
Ming Lei <tom.leiming@gmail.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Network Development <netdev@vger.kernel.org>
Subject: Re: [RFC PATCH] usb: hcd: warn about URB buffers that are not DMA aligned and are about to be DMA mapped
Date: Fri, 28 Jun 2013 15:39:27 +0300 [thread overview]
Message-ID: <51CD83FF.2030704@iki.fi> (raw)
In-Reply-To: <51BD94F5.2060803@iki.fi>
On 16.06.2013 13:35, Jussi Kivilinna wrote:
> On 16.06.2013 11:21, Oliver Neukum wrote:
>> On Saturday 15 June 2013 16:22:30 Jussi Kivilinna wrote:
>>
>>> Hm.. rethink this a bit.
>>>
>>> Transfer buffer might be dma aligned but shorter than cacheline and end of cacheline
>>> used as something else. Manual alignment by host driver does not catch that
>>> or fix that.
>>> So, yes.. dma mapping should work with unaligned buffers, but maybe the actual
>>> problem is multiple buffers from same cacheline.
>>
>> The buffers kmalloc() returns are OK in that regard. A driver that uses
>> a buffer for anything but buffering is buggy.
>
> Ok, I'll look at that direction. Thanks.
>
So if I understood correctly, drivers that allocate these as part of larger structures (struct *_device etc) are doing wrong thing and are potentially buggy. And this is because cachelines of buffers can be DMA mapped after usb_submit_urb() and editing same cacheline while URB is in-flight can therefore be hazardous.
I checked setup_packet and transfer_buffer usage of some drivers in 3.9.8 and made some observations. Should these be fixed?
URB setup_packet and transfer_buffer part of same structure (might share same cacheline for same URB):
* iforce:
- http://lxr.linux.no/linux+v3.9.8/drivers/input/joystick/iforce/iforce-usb.c#L173
- http://lxr.linux.no/linux+v3.9.8/drivers/input/joystick/iforce/iforce.h#L101
* usbvision:
- http://lxr.linux.no/linux+v3.9.8/drivers/media/usb/usbvision/usbvision-core.c#L1445
- http://lxr.linux.no/linux+v3.9.8/drivers/media/usb/usbvision/usbvision.h#L366
* catc:
- http://lxr.linux.no/linux+v3.9.8/drivers/net/usb/catc.c#L499
- http://lxr.linux.no/linux+v3.9.8/drivers/net/usb/catc.c#L500
- ctrl_buf, ctrl_dr: http://lxr.linux.no/linux+v3.9.8/drivers/net/usb/catc.c#L162
* rtl8150:
- http://lxr.linux.no/linux+v3.9.8/drivers/net/usb/rtl8150.c#L200
- http://lxr.linux.no/linux+v3.9.8/drivers/net/usb/rtl8150.c#L128
* rt2x000usb:
- http://lxr.linux.no/linux+v3.9.8/drivers/net/wireless/rt2x00/rt2x00usb.c#L212
- http://lxr.linux.no/linux+v3.9.8/drivers/net/wireless/rt2x00/rt2x00usb.c#L169
* rtl8187:
- http://lxr.linux.no/linux+v3.9.8/drivers/net/wireless/rtl818x/rtl8187/dev.c#L156
- http://lxr.linux.no/linux+v3.9.8/drivers/net/wireless/rtl818x/rtl8187/dev.c#L130
* uss720:
- http://lxr.linux.no/linux+v3.9.8/drivers/usb/misc/uss720.c#L176
- http://lxr.linux.no/linux+v3.9.8/drivers/usb/misc/uss720.c#L72
URB transfer_buffer array (transfer buffers preloaded as array, element size less than cacheline):
* rtlwifi:
- http://lxr.linux.no/linux+v3.9.8/drivers/net/wireless/rtlwifi/usb.c#L152
- http://lxr.linux.no/linux+v3.9.8/drivers/net/wireless/rtlwifi/wifi.h#L1859
- http://lxr.linux.no/linux+v3.9.8/drivers/net/wireless/rtlwifi/usb.c#L980
* catc:
- http://lxr.linux.no/linux+v3.9.8/drivers/net/usb/catc.c#L371
- http://lxr.linux.no/linux+v3.9.8/drivers/net/usb/catc.c#L162
URB setup_packet part of larger structure:
* gigaset:
- http://lxr.linux.no/linux+v3.9.8/drivers/isdn/gigaset/bas-gigaset.c#L90
- http://lxr.linux.no/linux+v3.9.8/drivers/isdn/gigaset/bas-gigaset.c#L581
* mISDN/hfcsusb:
- http://lxr.linux.no/linux+v3.9.8/drivers/isdn/hardware/mISDN/hfcsusb.c#L1732
- http://lxr.linux.no/linux+v3.9.8/drivers/isdn/hardware/mISDN/hfcsusb.c#L74
- http://lxr.linux.no/linux+v3.9.8/drivers/isdn/hardware/mISDN/hfcsusb.h#L270
* hisax/hfc_usb:
- http://lxr.linux.no/linux+v3.9.8/drivers/isdn/hisax/hfc_usb.c#L1185
- http://lxr.linux.no/linux+v3.9.8/drivers/isdn/hisax/hfc_usb.c#L227
- http://lxr.linux.no/linux+v3.9.8/drivers/isdn/hisax/hfc_usb.c#L193
* hisax/st5481:
- http://lxr.linux.no/linux+v3.9.8/drivers/isdn/hisax/st5481_usb.c#L42
- http://lxr.linux.no/linux+v3.9.8/drivers/isdn/hisax/st5481.h#L326
* hso:
- http://lxr.linux.no/linux+v3.9.8/drivers/net/usb/hso.c#L1812
- http://lxr.linux.no/linux+v3.9.8/drivers/net/usb/hso.c#L1846
- http://lxr.linux.no/linux+v3.9.8/drivers/net/usb/hso.c#L220
* pegasus:
- http://lxr.linux.no/linux+v3.9.8/drivers/net/usb/pegasus.c#L169
- http://lxr.linux.no/linux+v3.9.8/drivers/net/usb/pegasus.h#L111
* brcmfmac:
- http://lxr.linux.no/linux+v3.9.8/drivers/net/wireless/brcm80211/brcmfmac/usb.c#L209
- http://lxr.linux.no/linux+v3.9.8/drivers/net/wireless/brcm80211/brcmfmac/usb.c#L71
* staging/vt6656:
- http://lxr.linux.no/linux+v3.9.8/drivers/staging/vt6656/usbpipe.c#L142
- http://lxr.linux.no/linux+v3.9.8/drivers/staging/vt6656/device.h#L390
URB transfer_buffer part of larger structure:
* iforce:
- http://lxr.linux.no/linux+v3.9.8/drivers/input/joystick/iforce/iforce-usb.c#L170
- http://lxr.linux.no/linux+v3.9.8/drivers/input/joystick/iforce/iforce-usb.c#L167
- http://lxr.linux.no/linux+v3.9.8/drivers/input/joystick/iforce/iforce.h#L101
- http://lxr.linux.no/linux+v3.9.8/drivers/input/joystick/iforce/iforce-usb.c#L147
* ks959:
- http://lxr.linux.no/linux+v3.9.8/drivers/net/irda/ks959-sir.c#L278
- http://lxr.linux.no/linux+v3.9.8/drivers/net/irda/ks959-sir.c#L172
* ksdazzle-sir:
- http://lxr.linux.no/linux+v3.9.8/drivers/net/irda/ksdazzle-sir.c#L199
- http://lxr.linux.no/linux+v3.9.8/drivers/net/irda/ksdazzle-sir.c#L138
* wusbcore:
- http://lxr.linux.no/linux+v3.9.8/drivers/usb/wusbcore/security.c#L568
- http://lxr.linux.no/linux+v3.9.8/drivers/usb/wusbcore/wusbhc.h#L288
- http://lxr.linux.no/linux+v3.9.8/drivers/usb/wusbcore/wa-xfer.c#L378
- http://lxr.linux.no/linux+v3.9.8/drivers/usb/wusbcore/wa-xfer.c#L337
- http://lxr.linux.no/linux+v3.9.8/drivers/usb/wusbcore/wa-xfer.c#L661
- http://lxr.linux.no/linux+v3.9.8/drivers/usb/wusbcore/wa-xfer.c#L115
* mISDN/hfcsusb:
- http://lxr.linux.no/linux+v3.9.8/drivers/isdn/hardware/mISDN/hfcsusb.c#L1515
- http://lxr.linux.no/linux+v3.9.8/drivers/isdn/hardware/mISDN/hfcsusb.h#L247
- http://lxr.linux.no/linux+v3.9.8/drivers/isdn/hardware/mISDN/hfcsusb.c#L1071
- http://lxr.linux.no/linux+v3.9.8/drivers/isdn/hardware/mISDN/hfcsusb.h#L236
* hisax/hfc_usb:
- http://lxr.linux.no/linux+v3.9.8/drivers/isdn/hisax/hfc_usb.c#L924
- http://lxr.linux.no/linux+v3.9.8/drivers/isdn/hisax/hfc_usb.c#L148
- http://lxr.linux.no/linux+v3.9.8/drivers/isdn/hisax/hfc_usb.c#L591
- http://lxr.linux.no/linux+v3.9.8/drivers/isdn/hisax/hfc_usb.c#L144
* rc/imon:
- http://lxr.linux.no/linux+v3.9.8/drivers/media/rc/imon.c#L480
- http://lxr.linux.no/linux+v3.9.8/drivers/media/rc/imon.c#L504
- http://lxr.linux.no/linux+v3.9.8/drivers/media/rc/imon.c#L2148
- http://lxr.linux.no/linux+v3.9.8/drivers/media/rc/imon.c#L2232
- http://lxr.linux.no/linux+v3.9.8/drivers/media/rc/imon.c#L2452
- http://lxr.linux.no/linux+v3.9.8/drivers/media/rc/imon.c#L2462
- http://lxr.linux.no/linux+v3.9.8/drivers/media/rc/imon.c#L90
* catc:
- tx_buf, rx_buf, irq_buf: http://lxr.linux.no/linux+v3.9.8/drivers/net/usb/catc.c#L162
* hso:
- http://lxr.linux.no/linux+v3.9.8/drivers/net/usb/hso.c#L1464
- http://lxr.linux.no/linux+v3.9.8/drivers/net/usb/hso.c#L208
* pegasus:
- http://lxr.linux.no/linux+v3.9.8/drivers/net/usb/pegasus.c#L1030
- http://lxr.linux.no/linux+v3.9.8/drivers/net/usb/pegasus.h#L111
- http://lxr.linux.no/linux+v3.9.8/drivers/net/usb/pegasus.c#L886
- http://lxr.linux.no/linux+v3.9.8/drivers/net/usb/pegasus.h#L107
* brcmfmac:
- http://lxr.linux.no/linux+v3.9.8/drivers/net/wireless/brcm80211/brcmfmac/usb.c#L631
- http://lxr.linux.no/linux+v3.9.8/drivers/net/wireless/brcm80211/brcmfmac/usb.c#L71
* staging/bcm:
- http://lxr.linux.no/linux+v3.9.8/drivers/staging/bcm/InterfaceIsr.c#L125
- http://lxr.linux.no/linux+v3.9.8/drivers/staging/bcm/InterfaceAdapter.h#L63
* speedtch:
- http://lxr.linux.no/linux+v3.9.8/drivers/usb/atm/speedtch.c#L888
- http://lxr.linux.no/linux+v3.9.8/drivers/usb/atm/speedtch.c#L137
* gigaset:
- http://lxr.linux.no/linux+v3.9.8/drivers/isdn/gigaset/usb-gigaset.c#L467
- http://lxr.linux.no/linux+v3.9.8/drivers/isdn/gigaset/gigaset.h#L521
* ttusbir:
- http://lxr.linux.no/linux+v3.9.8/drivers/media/rc/ttusbir.c#L300
- http://lxr.linux.no/linux+v3.9.8/drivers/media/rc/ttusbir.c#L48
* vub300:
- http://lxr.linux.no/linux+v3.9.8/drivers/mmc/host/vub300.c#L467
- http://lxr.linux.no/linux+v3.9.8/drivers/mmc/host/vub300.c#L346
- http://lxr.linux.no/linux+v3.9.8/drivers/mmc/host/vub300.c#L491
- http://lxr.linux.no/linux+v3.9.8/drivers/mmc/host/vub300.c#L345
- http://lxr.linux.no/linux+v3.9.8/drivers/mmc/host/vub300.c#L1526
- http://lxr.linux.no/linux+v3.9.8/drivers/mmc/host/vub300.c#L355
* mcs7780:
- http://lxr.linux.no/linux+v3.9.8/drivers/net/irda/mcs7780.c#L519
- http://lxr.linux.no/linux+v3.9.8/drivers/net/irda/mcs7780.c#L844
- http://lxr.linux.no/linux+v3.9.8/drivers/net/irda/mcs7780.h#L103
* rt2x00usb:
- http://lxr.linux.no/linux+v3.9.8/drivers/net/wireless/rt2x00/rt2500usb.c#L1194
- http://lxr.linux.no/linux+v3.9.8/drivers/net/wireless/rt2x00/rt2x00usb.h#L387
* rtl8187:
- http://lxr.linux.no/linux+v3.9.8/drivers/net/wireless/rtl818x/rtl8187/dev.c#L551
- http://lxr.linux.no/linux+v3.9.8/drivers/net/wireless/rtl818x/rtl8187/rtl8187.h#L142
* zd1201:
- http://lxr.linux.no/linux+v3.9.8/drivers/net/wireless/zd1201.c#L817
- http://lxr.linux.no/linux+v3.9.8/drivers/net/wireless/zd1201.h#L42
* quatech2:
- http://lxr.linux.no/linux+v3.9.8/drivers/usb/serial/quatech2.c#L769
- http://lxr.linux.no/linux+v3.9.8/drivers/usb/serial/quatech2.c#L111
- http://lxr.linux.no/linux+v3.9.8/drivers/usb/serial/quatech2.c#L841
- http://lxr.linux.no/linux+v3.9.8/drivers/usb/serial/quatech2.c#L118
* caiaq:
- http://lxr.linux.no/linux+v3.9.8/sound/usb/caiaq/device.c#L425
- http://lxr.linux.no/linux+v3.9.8/sound/usb/caiaq/device.c#L430
- http://lxr.linux.no/linux+v3.9.8/sound/usb/caiaq/device.h#L77
- http://lxr.linux.no/linux+v3.9.8/sound/usb/caiaq/device.h#L79
URB transfer buffer in stack:
* alauda:
- command: http://lxr.linux.no/linux+v3.9.8/drivers/mtd/nand/alauda.c#L226
- command: http://lxr.linux.no/linux+v3.9.8/drivers/mtd/nand/alauda.c#L210
- command: http://lxr.linux.no/linux+v3.9.8/drivers/mtd/nand/alauda.c#L291
- command: http://lxr.linux.no/linux+v3.9.8/drivers/mtd/nand/alauda.c#L275
- command: http://lxr.linux.no/linux+v3.9.8/drivers/mtd/nand/alauda.c#L342
- command: http://lxr.linux.no/linux+v3.9.8/drivers/mtd/nand/alauda.c#L325
- command: http://lxr.linux.no/linux+v3.9.8/drivers/mtd/nand/alauda.c#L165
- oob: http://lxr.linux.no/linux+v3.9.8/drivers/mtd/nand/alauda.c#L230
- oob: http://lxr.linux.no/linux+v3.9.8/drivers/mtd/nand/alauda.c#L377
- oob: http://lxr.linux.no/linux+v3.9.8/drivers/mtd/nand/alauda.c#L401
- oob: http://lxr.linux.no/linux+v3.9.8/drivers/mtd/nand/alauda.c#L467
- oob: http://lxr.linux.no/linux+v3.9.8/drivers/mtd/nand/alauda.c#L295
* pn533:
- ack: http://lxr.linux.no/linux+v3.9.8/drivers/nfc/pn533.c#L630
* i2c-tiny-usb:
- func: http://lxr.linux.no/linux+v3.9.8/drivers/i2c/busses/i2c-tiny-usb.c#L116
- func: http://lxr.linux.no/linux+v3.9.8/drivers/i2c/busses/i2c-tiny-usb.c#L159
* zd1201:
- ret: http://lxr.linux.no/linux+v3.9.8/drivers/net/wireless/zd1201.c#L100
* rndis_host:
- notification: http://lxr.linux.no/linux+v3.9.8/drivers/net/usb/rndis_host.c#L143
* 6fire:
- buffer: http://lxr.linux.no/linux+v3.9.8/sound/usb/6fire/comm.c#L113
- buffer: http://lxr.linux.no/linux+v3.9.8/sound/usb/6fire/comm.c#L122
- send_buffer: http://lxr.linux.no/linux+v3.9.8/sound/usb/6fire/comm.c#L96
-Jussi
next prev parent reply other threads:[~2013-06-28 12:39 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20130614133803.25747.98705.stgit@localhost6.localdomain6>
[not found] ` <20130614133803.25747.98705.stgit-bi+AKbBUZKagILUCTcTcHdKyNwTtLsGr@public.gmane.org>
2013-06-15 7:41 ` [RFC PATCH] usb: hcd: warn about URB buffers that are not DMA aligned and are about to be DMA mapped Ming Lei
2013-06-15 10:19 ` Jussi Kivilinna
[not found] ` <51BC3F9E.3010605-X3B1VOXEql0@public.gmane.org>
2013-06-15 12:07 ` Ming Lei
[not found] ` <CACVXFVMe9fgdiDTRC0rWvwZJM8aT7AZY8Q1MwiOTc4ks0PQPOg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-06-15 13:10 ` Jussi Kivilinna
2013-06-15 13:22 ` Jussi Kivilinna
[not found] ` <51BC6A96.7030707-X3B1VOXEql0@public.gmane.org>
2013-06-16 8:21 ` Oliver Neukum
2013-06-16 10:35 ` Jussi Kivilinna
2013-06-28 12:39 ` Jussi Kivilinna [this message]
2013-06-28 12:58 ` Oliver Neukum
2013-06-15 13:47 ` Ming Lei
2013-06-16 10:34 ` Jussi Kivilinna
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