linux-toradex.git/drivers/block/sunvdc.c, branch v4.4.93

sunvdc: reconnect ldc after vds service domain restarts

2014-12-12T02:52:45+00:00

This change enables the sunvdc driver to reconnect and recover if a vds
service domain is disconnected or bounced.

By default, it will wait indefinitely for the service domain to become
available again, but will honor a non-zero vdc-timout md property if one
is set. If a timeout is reached, any in-progress I/O's are completed
with -EIO.

Signed-off-by: Dwight Engen 
Reviewed-by: Chris Hyser 
Signed-off-by: David S. Miller

vio: create routines for inc,dec vio dring indexes

2014-12-12T02:52:45+00:00

Both sunvdc and sunvnet implemented distinct functionality for incrementing
and decrementing dring indexes. Create common functions for use by both
from the sunvnet versions, which were chosen since they will still work
correctly in case a non power of two ring size is used.

Signed-off-by: Dwight Engen 
Signed-off-by: David S. Miller

sunvdc: fix module unload/reload

2014-12-12T02:51:57+00:00

Free resources allocated during port/disk probing so that the module may be
successfully reloaded after unloading.

Signed-off-by: Dwight Engen 
Signed-off-by: David S. Miller

sunvdc: don't call VD_OP_GET_VTOC

2014-10-31T19:49:45+00:00

The VD_OP_GET_VTOC operation will succeed only if the vdisk backend has a
VTOC label, otherwise it will fail. In particular, it will return error
48 (ENOTSUP) if the disk has an EFI label. VTOC disk labels are already
handled by directly reading the disk in block/partitions/sun.c (enabled by
CONFIG_SUN_PARTITION which defaults to y on SPARC). Since port->label is
unused in the driver, remove the call and the field.

Signed-off-by: Dwight Engen 
Signed-off-by: David S. Miller

vio: fix reuse of vio_dring slot

2014-09-30T21:37:35+00:00

vio_dring_avail() will allow use of every dring entry, but when the last
entry is allocated then dr->prod == dr->cons which is indistinguishable from
the ring empty condition. This causes the next allocation to reuse an entry.
When this happens in sunvdc, the server side vds driver begins nack'ing the
messages and ends up resetting the ldc channel. This problem does not effect
sunvnet since it checks for < 2.

The fix here is to just never allocate the very last dring slot so that full
and empty are not the same condition. The request start path was changed to
check for the ring being full a bit earlier, and to stop the blk_queue if
there is no space left. The blk_queue will be restarted once the ring is
only half full again. The number of ring entries was increased to 512 which
matches the sunvnet and Solaris vdc drivers, and greatly reduces the
frequency of hitting the ring full condition and the associated blk_queue
stop/starting. The checks in sunvent were adjusted to account for
vio_dring_avail() returning 1 less.

Orabug: 19441666
OraBZ: 14983

Signed-off-by: Dwight Engen 
Signed-off-by: David S. Miller

sunvdc: limit each sg segment to a page

2014-09-30T21:37:35+00:00

ldc_map_sg() could fail its check that the number of pages referred to
by the sg scatterlist was <= the number of cookies.

This fixes the issue by doing a similar thing to the xen-blkfront driver,
ensuring that the scatterlist will only ever contain a segment count <=
port->ring_cookies, and each segment will be page aligned, and <= page
size. This ensures that the scatterlist is always mappable.

Orabug: 19347817
OraBZ: 15945

Signed-off-by: Dwight Engen 
Signed-off-by: David S. Miller

sunvdc: compute vdisk geometry from capacity

2014-09-30T21:37:35+00:00

The LDom diskserver doesn't return reliable geometry data. In addition,
the types for all fields in the vio_disk_geom are u16, which were being
truncated in the cast into the u8's of the Linux struct hd_geometry.

Modify vdc_getgeo() to compute the geometry from the disk's capacity in a
manner consistent with xen-blkfront::blkif_getgeo().

Signed-off-by: Dwight Engen 
Signed-off-by: David S. Miller

sunvdc: add cdrom and v1.1 protocol support

2014-09-30T21:37:34+00:00

Interpret the media type from v1.1 protocol to support CDROM/DVD.

For v1.0 protocol, a disk's size continues to be calculated from the
geometry returned by the vdisk server. The geometry returned by the server
can be less than the actual number of sectors available in the backing
image/device due to the rounding in the division used to compute the
geometry in the vdisk server.

In v1.1 protocol a disk's actual size in sectors is returned during the
handshake. Use this size when v1.1 protocol is negotiated. Since this size
will always be larger than the former geometry computed size, disks created
under v1.0 will be forwards compatible to v1.1, but not vice versa.

Signed-off-by: Dwight Engen 
Signed-off-by: David S. Miller

sunvdc: Fix off-by-one in generic_request().

2013-02-14T19:49:01+00:00

The 'operations' bitmap corresponds one-for-one with the operation
codes, no adjustment is necessary.

Reported-by: Mark Kettenis 
Signed-off-by: David S. Miller

Drivers: block: remove __dev* attributes.

2013-01-03T23:57:15+00:00

CONFIG_HOTPLUG is going away as an option.  As a result, the __dev*
markings need to be removed.

This change removes the use of __devinit, __devexit_p, __devinitdata,
__devinitconst, and __devexit from these drivers.

Based on patches originally written by Bill Pemberton, but redone by me
in order to handle some of the coding style issues better, by hand.

Cc: Bill Pemberton 
Cc: Mike Miller 
Cc: Chirag Kantharia 
Cc: Geoff Levand 
Cc: Jim Paris 
Cc: Rusty Russell 
Cc: "Michael S. Tsirkin" 
Cc: Grant Likely 
Cc: Matthew Wilcox 
Cc: Keith Busch 
Cc: "David S. Miller" 
Cc: Benjamin Herrenschmidt 
Cc: NeilBrown 
Cc: Jens Axboe 
Cc: Tao Guo 
Signed-off-by: Greg Kroah-Hartman