src/sys/dev, branch release/8.1.0

MFC r209541, r209548:

2010-06-28T14:15:54Z

Fix the AR_SREV_MERLIN_20_OR_LATER() check. Approved by: re (kensmith)

MFC 209213:

2010-06-23T17:51:11Z

When updating individual CPU's lowest Cx state to use, never set it to a state lower than the lowest one supported by the current CPU. This closes some races with changes to the hw.acpi.cpu_cx_lowest sysctl while Cx states for individual CPUs were changing (e.g. unplugging the AC adapter of a laptop) that could result in panics. Approved by: re (kib)

MFC r209341:

2010-06-23T10:06:31Z

Report transport type in XPT_PATH_INQ. Approved by: re (kib)

MFC r209340:

2010-06-23T10:04:48Z

Report transport type in XPT_PATH_INQ. PR: i386/147929 Approved by: re (kib)

MFC: r208776

2010-06-11T22:01:58Z

Avoid possible NULL-dereferences. Found with: Coverity Prevent(tm) CID: 3428 Approved by: re (kib)

MFC 199549, 199997, 204158, 207673, and 208901.

2010-06-11T19:17:36Z

Bring in a number of netfront changes: r199549 | jhb Remove commented out reference to if_watchdog and an assignment of zero to if_timer. Reviewed by: scottl r199997 | gibbs Add media ioctl support and link notifications so that devd will attempt to run dhclient on a netfront (xn) device that is setup for DHCP in /etc/rc.conf. PR: kern/136251 (fixed differently than the submitted patch) r204158 | kmacy - make printf conditional - fix witness warnings by making configuration lock a mutex r207673 | joel Switch to our preferred 2-clause BSD license. Approved by: kmacy r208901 | ken A number of netfront fixes and stability improvements: - Re-enable TSO. This was broken previously due to CSUM_TSO clearing the CSUM_TCP flag, so our checksum flags were incorrectly set going to the netback driver. That was fixed in r206844 in tcp_output.c, so we can turn TSO back on here. - Fix the way transmit slots are calculated, so that we can't overfill the ring. - Avoid sending packets with more fragments/segments than netback can handle. The Linux netback code can only handle packets of MAX_SKB_FRAGS, which turns out to be 18 on machines with 4K pages. We can easily generate packets with 32 or so fragments with TSO turned on. Right now the solution is just to drop the packets (since netback doesn't seem to handle it gracefully), but we should come up with a way to allow a driver to tell the TCP stack the maximum number of fragments it can handle in a single packet. - Fix the way the consumer is tracked in the receive path. It could get out of sync fairly easily. - Use standard Xen ring macros to make it clearer how netfront is using the rings. - Get rid of Linux-ish negative errno return values. - Added more documentation to the driver. - Refactored code to make it easier to read. - Some other minor fixes. Reviewed by: gibbs Sponsored by: Spectra Logic Approved by: re (bz)

MFC r208162, 208836, 208837:

2010-06-11T14:10:20Z

Program the K2 SATA controller's interrupt to be level-triggered low, and respect the edge/level settings in the device tree. OpenPIC on powerpc sets interrupts to be level high by default. On Apple interrupt controllers, all level interrupts are low regardless of programming except interrupt 0, used by K2 SATA on some Apple systems, with the result that the K2 SATA IRQ is misconfigured. Pending review of changes to this default, work around this by changing the programming of the K2 SATA interrupt to level low. Approved by: re (kib)

MFC r208870:

2010-06-11T14:06:35Z

Some revisions of the Serverworks K2 SATA controller have a data corruption bug where if an ATA command is issued before DMA is started, data will become available to the controller before it knows what to do with it. This results in either data corruption or a controller crash. This patch remedies the problem by adopting the workaround employed by Linux and Darwin: starting the DMA engine prior to sending the ATA command. Reviewed by: mav Approved by: re (kib)

MFC r208642:

2010-06-10T20:54:53Z

Don't shadow the global variable 'version'. Submitted by: Arnaud Lacombe Approved by: re (kensmith)

MFC r204644:

2010-06-10T20:51:13Z

Replace Id keyword with FreeBSD keyword and set the svn props correctly. No functional change. Approved by: re (bz)