[PATCH v2 18/18] hw/block/nvme: Document zoned parameters in usage text

[Dmitry Fomichev <dmitry.fomichev@wdc.com>]

Added brief descriptions of the new driver properties now available
to users to configure features of Zoned Namespace Command Set in the
driver.

This patch is for documentation only, no functionality change.

Signed-off-by: Dmitry Fomichev <dmitry.fomichev@wdc.com>
---
 hw/block/nvme.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 60 insertions(+), 2 deletions(-)

diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 63e7a6352e..90b1ae24b5 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -9,7 +9,7 @@
  */
 
 /**
- * Reference Specs: http://www.nvmexpress.org, 1.2, 1.1, 1.0e
+ * Reference Specs: http://www.nvmexpress.org, 1.4, 1.3, 1.2, 1.1, 1.0e
  *
  *  http://www.nvmexpress.org/resources/
  */
@@ -20,7 +20,8 @@
  *      -device nvme,drive=<drive_id>,serial=<serial>,id=<id[optional]>, \
  *              cmb_size_mb=<cmb_size_mb[optional]>, \
  *              [pmrdev=<mem_backend_file_id>,] \
- *              max_ioqpairs=<N[optional]>
+ *              max_ioqpairs=<N[optional]> \
+ *              zoned=<true|false[optional]>
  *
  * Note cmb_size_mb denotes size of CMB in MB. CMB is assumed to be at
  * offset 0 in BAR2 and supports only WDS, RDS and SQS for now.
@@ -32,6 +33,63 @@
  * For example:
  * -object memory-backend-file,id=<mem_id>,share=on,mem-path=<file_path>, \
  *  size=<size> .... -device nvme,...,pmrdev=<mem_id>
+ *
+ * Setting "zoned" to true makes the driver emulate zoned namespaces.
+ * In this case, of the following options are available to configure zoned
+ * operation:
+ *     zone_size=<zone size in MiB>
+ *
+ *     zone_capacity=<zone capacity in MiB, default: zone_size>
+ *
+ *     zone_file=<zone metadata file name, default: none>
+ *         Zone metadata file, if specified, allows zone information
+ *         to be persistent across shutdowns and restarts.
+ *
+ *     zone_descr_ext_size=<zone descriptor extension size, default 0>
+ *         This value needs to be specified in 64B units. If it is zero,
+ *         namespace(s) will not support zone descriptor extensions.
+ *
+ *     max_active=<Maximum Active Resources (zones), default: 0 - no limit>
+ *
+ *     max_open=<Maximum Open Resources (zones), default: 0 - no limit>
+ *
+ *     reset_rcmnd_delay=<Reset Zone Recommended Delay in milliseconds>
+ *         The amount of time that passes between the moment when a zone
+ *         enters Full state and when Reset Zone Recommended attribute
+ *         is set for that zone.
+ *
+ *     reset_rcmnd_limit=<Reset Zone Recommended Limit in milliseconds>
+ *         If this value is zero (default), RZR attribute is not set for
+ *          any zones.
+ *
+ *     finish_rcmnd_delay=<Finish Zone Recommended Delay in milliseconds>
+ *         The amount of time that passes between the moment when a zone
+ *         enters an Open or Closed state and when Finish Zone Recommended
+ *         attribute is set for that zone.
+ *
+ *     finish_rcmnd_limit=<Finish Zone Recommended Limit in milliseconds>
+ *         If this value is zero (default), FZR attribute is not set for
+ *         any zones.
+ *
+ *     zamds=<zone append maximum data size, in KiB, default: 128>
+ *         The maximum I/O size that can be supported by Zone Append
+ *         command. Since internally this this value is maintained as
+ *         ZAMDS = log2(<maximum append size> / <page size>), some
+ *         values assigned to this property may be rounded down and
+ *         result in a lower maximum ZA data size being in effect.
+ *
+ *     zone_async_events=<send zone Async Events: default: true>
+ *         Enable sending Zone Descriptor Changed AENs to the host.
+ *
+ *     offline_zones=<the number of offline zones to inject, default: 0>
+ *
+ *     rdonly_zones=<the number of read-only zones to inject, default: 0>
+ *
+ *     cross_zone_read=<enables Read Across Zone Boundaries, default: true>
+ *
+ *     fill_pattern=<data fill pattern, default: 0x00>
+ *         Byte pattern to to return for any portions of unwritten data
+ *         during read.
  */
 
 #include "qemu/osdep.h"
-- 
2.21.0