queueing at the scsipi midlayer, and if the midlayer is not requested to
enable tagged queueing, the midlayer will only queue one command to the
adapter driver for each device. The SmartArray adapter is capable of
handling multiple commands, and in the rather common case where there is
no battery backup and no write cache, doing single write commands is very
slow. The SmartArray adapter runs much better when several commands can
be issued to a device.
This has been observed and discussed in several list threads, notably:
http://mail-index.NetBSD.org/netbsd-users/2008/10/01/msg002083.htmlhttp://mail-index.NetBSD.org/tech-kern/2008/11/30/msg003704.html
This also addresses PR kern/39686.
To enable tagged queueing, the adapter driver responds to the midlayer
request to set the transfer mode. However, the SmartArray does not respond
to the SCSI INQUIRY command with an ANSII field of 2 or more, so the
scsipi midlayer will ignore the CmdQue bit in the flags3 field of the
inquiry data. This fix will patch the inquiry data so set the ANSII field
to 2, and responds to the midlayer request to set the transfer mode by
requesting tagged queueing.
In addition, the original port of the driver did not set up the adapter
parameters correctly as mentioned in the second list thread mentioned
above. The adapt_openings is the total number of commands that the
adapter will accept rather than the number of commands divided by the
number of logical drives. Also, the adapt_max_periph is the maximum number
of commands which can be queued per peripheral device, not the number of
logical drives [which in the case of a single logical drive limited the
number of commands queued to 1].
I'm also suppressing an error message for invalid commands if the error
was due to the SCSI_SYNCHRONIZE_CACHE_10 command, since that command is
not supported by the SmartArray adapter, but used with wapbl(4) meta-data
journaling. Setting the ANSII version to 2 to allow enabling tagged queueing
also enables the use of the SCSI_SYNCHRONIZE_CACHE_10 command.
Use use 64-bit DMA tag (where available) for ahcisata(4) at jmide(4).
Beginnings of detach/resume support for jmide(4).
Sprinkle static. Misc. little changes.
For some reason the driver will put virtual addresses in these variables,
so I'd say this still not quite right. Oh well, at least it compiles on LP64.
bus_space_tag_create(9), and bus_space_tag_destroy(9). Use
bus_space_is_equal(9) throughout the kernel to compare
bus_space_tag_t's. Tested on i386 and on sparc64.
- When terminating the adapter request after the cmd has been removed
from the free list, put that cmd back on the free list before returing.
- Correctly indicate which bus_dma_load() failed.
Analysis and fix from Michael L. Hitch in PR/42844.
- Add function to parse RDH FIS for use in implementing AT_READREG.
- Correct and clean up some structure definitions.
- Sprinkle a bit of const.
- Remove dependency on <dev/ic/wdcreg.h>, WDCTL_4BIT doesn't seem
to be specified by any recent ATA standard, and it seems to make
no difference in practice.
- Stop using WDSD_IBM, these bits have been obsolete since before SATA.
siisata:
- Implement AT_READREG.
- Reap now-unneeded <dev/ic/wdcreg.h>.
- Whitespace and slight debug code cleanup.
- Some possibly-uncessary code reordering.
ahcisata:
- Implement AT_READREG.
- Reap now-unneeded <dev/ic/wdcreg.h>.
kiyohara