On Fri, Jul 13, 2012 at 04:42:51PM +0200, Dominic Eschweiler wrote: > Am Freitag, den 13.07.2012, 16:22 +0300 schrieb Michael S. Tsirkin: > > Could you give an example of the problem? How do you bind > > both UIO and another driver to the same device? > > Sorry, I'm looking on it from the user-space perspective. Maybe I'm > wrong, but I can give you an example : > > lspci -v > ... > 03:00.0 Network controller: Broadcom Corporation BCM4331 802.11a/b/g/n > (rev 02) > Subsystem: Apple Inc. AirPort Extreme > Flags: bus master, fast devsel, latency 0, IRQ 17 > Memory at b0600000 (64-bit, non-prefetchable) [size=16K] > Capabilities: [40] Power Management version 3 > Capabilities: [58] Vendor Specific Information: Len=78 <?> > Capabilities: [48] MSI: Enable- Count=1/1 Maskable- 64bit+ > Capabilities: [d0] Express Endpoint, MSI 00 > Capabilities: [100] Advanced Error Reporting > Capabilities: [13c] Virtual Channel > Capabilities: [160] Device Serial Number 85-f2-6d-ff-ff-42-68-a8 > Capabilities: [16c] Power Budgeting <?> > Kernel driver in use: bcma-pci-bridge > ... > > This Device has one 64 Bit Bar. When I look at the related sysfs > entry ... > > > ls /sys/bus/pci/devices/0000:03:00.0 > ... > --w------- 1 root root 4.0K Jul 13 16:35 reset > -r--r--r-- 1 root root 4.0K Jul 12 21:43 resource > -rw------- 1 root root 16K Jul 13 16:35 resource0 > lrwxrwxrwx 1 root root 0 Jul 12 23:41 subsystem > -> ../../../../bus/pci > ... > > ... I can see that it should be possible to map resource0 and directly > write into a BAR which is already managed by a kernel drivers. > > Moving this functionality to UIO would only generate those resource > files, if the device is handled by UIO and therefore intended to be > managed from the user-space.
UIO has the same property, doesn't it? Multiple users can access device memory through sysfs. > -- > Gruß > Dominic -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
