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c45a6816c1
A recent proposed feature addition to the virtio block driver revealed some flaws in the API: in particular, we assume that feature negotiation is complete once a driver's probe function returns. There is nothing in the API to require this, however, and even I didn't notice when it was violated. So instead, we require the driver to specify what features it supports in a table, we can then move the feature negotiation into the virtio core. The intersection of device and driver features are presented in a new 'features' bitmap in the struct virtio_device. Note that this highlights the difference between Linux unsigned-long bitmaps where each unsigned long is in native endian, and a straight-forward little-endian array of bytes. Drivers can still remove feature bits in their probe routine if they really have to. API changes: - dev->config->feature() no longer gets and acks a feature. - drivers should advertise their features in the 'feature_table' field - use virtio_has_feature() for extra sanity when checking feature bits Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> |
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aoe | ||
paride | ||
amiflop.c | ||
ataflop.c | ||
brd.c | ||
cciss_cmd.h | ||
cciss_scsi.c | ||
cciss_scsi.h | ||
cciss.c | ||
cciss.h | ||
cpqarray.c | ||
cpqarray.h | ||
cryptoloop.c | ||
DAC960.c | ||
DAC960.h | ||
floppy.c | ||
ida_cmd.h | ||
ida_ioctl.h | ||
Kconfig | ||
loop.c | ||
Makefile | ||
nbd.c | ||
pktcdvd.c | ||
ps3disk.c | ||
smart1,2.h | ||
sunvdc.c | ||
swim3.c | ||
sx8.c | ||
ub.c | ||
umem.c | ||
umem.h | ||
viodasd.c | ||
virtio_blk.c | ||
xd.c | ||
xd.h | ||
xen-blkfront.c | ||
xsysace.c | ||
z2ram.c |