This is a completely rewritten scsipi_xfer execution engine, and the
associated changes to HBA drivers. Overview of changes & features:
- All xfers are queued in the mid-layer, rather than doing so in an
ad-hoc fashion in individual adapter drivers.
- Adapter/channel resource management in the mid-layer, avoids even trying
to start running an xfer if the adapter/channel doesn't have the resources.
- Better communication between the mid-layer and the adapters.
- Asynchronous event notification mechanism from adapter to mid-layer and
peripherals.
- Better peripheral queue management: freeze/thaw, sorted requeueing during
recovery, etc.
- Clean separation of peripherals, adapters, and adapter channels (no more
scsipi_link).
- Kernel thread for each scsipi_channel makes error recovery much easier
(no more dealing with interrupt context when recovering from an error).
- Mid-layer support for tagged queueing: commands can have the tag type
set explicitly, tag IDs are allocated in the mid-layer (thus eliminating
the need to use buggy tag ID allocation schemes in many adapter drivers).
- support for QUEUE FULL and CHECK CONDITION status in mid-layer; the command
will be requeued, or a REQUEST SENSE will be sent as appropriate.
Just before the merge syssrc has been tagged with thorpej_scsipi_beforemerge
resulting in a blank screen when f.e. a setcursor ioctl was called
after the screenblanker had enabled the screen again ... the actual
switching on was then never performed at VSYNC.
A simple |= instead of = does the trick ... just leave the other bits
on please :)
saves about 2.2MB under /usr/include/dev/. Discussed on tech-kern@
recently.
I HOPE to get the list right. The headers I left in are ones
used for MI tools and those whose usage I discovered by grep over tree sources.
Feel free to put needed includes back in if you encounter anything which
should not be removed from lists.
- video base register value brings different scanline starting address
of framebuffer depending on VRAM chip column size.
many other issues left unsolved.
- text rendered in incorrect colours.
- acceleration codes should be reimplemented from scratch.
than the preivous code. It can show readable characters on screen.
Tested only with 32bpp model of PMAGD opion card. Need more work for 8bpp.
- 2D accelleration will be revamped to ultilize SFBplus features.
- there seems much mulfunctionness in 32bpp codes of /sys/dev/rasops/.
Need to rectify every corners.
at tcds in files.alpha for now, and add a new `xasc at tcds' to files.pmax.
after pmax has moved fully to MI scsi (and `asc' is MI scsi), we should move
the device asc, etc., lines to files.tc.
an unaligned buffer. The last word of the buffer was not getting flushed
if the buffer was unaligned and fit in a single DMA segment. Now dump(8)
works on both MIPS1 and MIPS3 DECstations.
and the buffer is not 8-byte aligned, it leaves a partial transfer in the
SDRx registers. This could cause data corruption in dump(8) because the
read-ahead buffers are allocated on a non-aligned address. When the read
DMA transfer is interrupted and the current DMA position is not aligned,
call the dma_end() routine to flush the SDRx register contents to the
buffer.
stored in device softc. rasops_cmap[] array is orginazed in 256
iteration of 3 byte long RBG triplet, which does not match with
struct wsdisplay_cmap design.
Drochner's work made in nisimura-pmax-wscons branch. Still a little
to do before useful for DECstation. MI softintr required.
- allow wildcard matchs to have zstty/zskbd/zsms in default hardware
configuration.
- abandon to check zs_ioasic_cnattach() return value; it doesn't fail.
- have zs_ioasic_cnattach() serial line parameters hardcoded inside, in
symmetry with zs_ioasic_lk201_cnattach().
unaligned transfers and adjust the physical address to align the transfer.
If the buffer end just crossed the page boundary, the computation of the
NEXTPTR physical address resulted in using -1. The cleanup at the end of
the DMA transfer would try to copy the residual data to physical address
0x1ffffffc. This would silently corrupt data on the R3000 and usually
would hang the R4000.
different than on the DECstation).
- Use IOASIC_DMA_BLOCKSIZE instead of PAGE_SIZE.
Should make this work on the Alpha. From discussion with
Izumi Tsutsui, Gregory McGarry, and Chris Demetriou, and
much reading of EK-D3SYS-PM.
device and the id string is not found in option ROM string, but
ULTRIX/OSF1 call it so anyway.
- Squash IOASIC DMA buffer allocation into device attach() sequence.
<vm/pglist.h> -> <uvm/uvm_pglist.h>
<vm/vm_inherit.h> -> <uvm/uvm_inherit.h>
<vm/vm_kern.h> -> into <uvm/uvm_extern.h>
<vm/vm_object.h> -> nothing
<vm/vm_pager.h> -> into <uvm/uvm_pager.h>
also includes a bunch of <vm/vm_page.h> include removals (due to redudancy
with <vm/vm.h>), and a scattering of other similar headers.
"off_t" and the return value is a "paddr_t" to allow mappings
at offsets past 2^31 bytes. Somewhat inspired by FreeBSD, which
only changed the offset to a "vm_offset_t".
Includes updates for the i386, pc532 and sh3 mmmmap from Jason Thorpe.
timeout()/untimeout() API:
- Clients supply callout handle storage, thus eliminating problems of
resource allocation.
- Insertion and removal of callouts is constant time, important as
this facility is used quite a lot in the kernel.
The old timeout()/untimeout() API has been removed from the kernel.
flexibility in turn; this renderer is 2B stroke (less than 16 pixel
width) font only. If 1B stroke (less than 8 pixel width) font is
ever supported, the font data should be converted into 2B stroke
during font initialization process. 'wsfont_realize()' is to be
proposed in order to have 'CPU and/or accelerator hardware friendly'
format to squeeze maxinum performance.
configured, but after all adapters have been configured. When multiple
adapters are present, only the last configured adapter could be matched
to the boot device slot. The adapter attach routines now check if that
adapter slot matches the boot device slot and saves the softc pointer
for that controller. Then when the disks are configured, dk_establish()
matches the appropriate controller.
simonb