freebsd kernel with SKQ
3255f4fca4
Disable "cache line streaming" for aic7890/91 Rev A chips. I have never seen these chips fail using this feature, but some of Adaptec's regression tests have. Explicitly set "cache line streaming" to on for aic7896/97 chips. This was happening before, but this documents the fact that these chips will not function correctly without CACHETHEEN set. aic7xxx.h: Add new bug types. Fix a typo in a comment. aic7xxx.reg: Add a definition for the SHVALID bit in SSTAT3 for Ultra2/3 chips. This bit inicates whether the bottom most (current) element in the S/G fifo has exhausted its data count. aic7xxx.seq: Be more careful in how we turn off the secondary DMA channel. Being less careful may hang the PCI bus arbitor that negotiates between the two DMA engines. Remove an unecessary and incorrect flag set operation in the overrun case. On Ultra2/3 controllers, clear the dma FIFO before starting to handle an overrun. We don't want any residual bytes from the beginning of the overrun to cause the code that shuts down the DMA engine from hanging because the FIFO is not (and never will be) empty. If the data fifo is empty by the time we notice that a read transaction has completed, there is no need to hit the flush bit on aic7890/91 hardware that will not perform an auto-flush. Skip some cycles by short circuiting the manual flush code in this case. When transitioning out of data phase, make sure that we have the next S/G element loaded for the following reconnect if there is more work to do. The code would do this in most cases before, but there was a small window where the current S/G element could be exhausted before our fetch of the next S/G element completed. Since the S/G fetch is already initiated at this point, it makes sense to just wait for the segment to arrive instead of incuring even more latency by canceling the fetch and initiating it later. Fast path the end of data phase handling for the last S/G segment. In the general case, we might have worked ahead a bit by stuffing the S/G FIFO with additional segments. If we stop before using them all, we need to fixup our location in the S/G stream. Since we can't work past the last S/G segment, no fixups are ever required if we stop somewhere in that final segment. Fix a little buglet in the target mode dma bug handler. We were employing the workaround in all cases instead of only for the chips that require it. Fix the cause of SCB timeouts and possible "lost data" during read operations on the aic7890. When sending a data on any Ultra2/3 controller, the final segment must be marked as such so the FIFO will be flushed and cleaned up correctly when the transfer is ended. We failed to do this for the CDB transfer and so, if the target immediately transfered from command to data phase without an intervening disconnection, the first segment transferred would be any residual bytes from the cdb transfer. The Ultra160 controllers for some reason were not affected by this problem. Many Thanks to Tor Egge for bringing the aic7890 problem to my attention, providing analysis, as well as a mechanism to reproduce the problem. |
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| bin | ||
| contrib | ||
| crypto | ||
| etc | ||
| games | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| kerberosIV | ||
| lib | ||
| libexec | ||
| release | ||
| sbin | ||
| secure | ||
| share | ||
| sys | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| COPYRIGHT | ||
| Makefile | ||
| Makefile.inc1 | ||
| Makefile.upgrade | ||
| README | ||
| UPDATING | ||
This is the top level of the FreeBSD source directory. This file was last revised on: $FreeBSD$ For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information). The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree, the most commonly used one being ``world'', which rebuilds and installs everything in the FreeBSD system from the source tree except the kernel and the contents of /etc. Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags. Building a kernel with config(8) is a somewhat more involved process, documentation for which can be found at: http://www.freebsd.org/handbook/kernelconfig.html And in the config(8) man page. The sample kernel configuration files reside in the sys/i386/conf sub-directory (assuming that you've installed the kernel sources), the file named GENERIC being the one used to build your initial installation kernel. The file LINT contains entries for all possible devices, not just those commonly used, and is meant more as a general reference than an actual kernel configuration file (a kernel built from it wouldn't even run). Source Roadmap: --------------- bin System/User commands. contrib Packages contributed by 3rd parties. crypto Export controlled stuff (see crypto/README). etc Template files for /etc games Amusements. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. kerberosIV Kerberos package. lib System libraries. libexec System daemons. release Release building Makefile & associated tools. sbin System commands. secure DES and DES-related utilities - NOT FOR EXPORT! share Shared resources. sys Kernel sources. tools Utilities for regression testing and miscellaneous tasks. usr.bin User commands. usr.sbin System administration commands. For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see: http://www.freebsd.org/handbook/synching.html