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. -- Gruß Dominic -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
