Conghui Chen 49322ac002 dm: storage: support cache mode toggling ...

1. support "writeback" and "writethru" mode toggling for virtio-blk
conditionally. When starting DM with "writethru" parameter in
virtio-blk, guest OS could not toggle cache mode. When starting DM
with "writeback" parameter in virtio-blk, guest OS could toggle
cache mode.

    ------------------------------
    DM cmdline  | toggle support
    ------------+-----------------
    writeback   | yes
    writethru   | no
    ------------------------------

2. To toggle cache mode, run below command in guest OS:

    echo "write back" > /sys/devices/xxx/vdx/cache_type
OR
    echo "write through" > /sys/devices/xxx/vdx/cache_type

Signed-off-by: Conghui Chen <conghui.chen@intel.com>
Reviewed-by: Shuo Liu <shuo.a.liu@intel.com>
Acked-by: Yin Fengwei <fengwei.yin@intel.com>

2018-08-10 10:33:21 +08:00

..

pci

dm: storage: support cache mode toggling

2018-08-10 10:33:21 +08:00

platform

dm: add S3 support for UOS

2018-08-02 13:14:03 +08:00

block_if.c

dm: storage: support cache mode toggling

2018-08-10 10:33:21 +08:00

uart_core.c

dm: uart: add state check of backend tty before uart_closetty

2018-08-07 10:11:03 +08:00

usb_core.c

DM USB: change TRB ring processing logic for ISOC transfer

2018-07-20 10:42:34 +08:00