2da2ade021
state said device should go into. This was a snafu introduced in the ACPI/PCI awareness separation. When putting a device into a power state, the bus (and thus firmware, eg ACPI) should be asked before hand to check whether the device can indeed go into that power state. There's a set of nodes in ACPI under each device - the _SxD nodes - which state which ACPI power state to put the device into when the system is going into power save state 'x'. So when going into S3, the existence of an _S3D node would override whatever the system was trying to do. By default the PCI code wants to put devices into D3 before suspending. I have a laptop here (Asus Zenbook - check the PR) whose EHCI controller really wants to be in D2 during suspend, not D3. So if we put it into D3 and then try to enter S3, everything hangs. The device itself can go into D3 - it just can't be there when the call to ACPI to enter S3 occurs. The PCI patch fixes this. jkim@ noticed that the same is needed for the ACPI child device enumeration. Thankyou to Matt Dillon (the programmer, not the actor) for buying me this particular laptop so I could debug the issues with the Atheros AR9485 that is in it. It's his fault that I ended up with this laptop and was sufficiently annoyed by the lack of USB suspend to go down this rabbit hole. Tested: * Thinkpad T400 * Thinkpad X230 * Thinkpad T42 * Thinkpad T60 * Asus Zenbook (see PR) * Asus EEEPC 701 * Asus EEEPC 1001PX TODO: * Figure out what we should do about devices we unload drivers for that want to be in a specific state when entering S3 / S4 - the "put devices into D3 if they're not bound to a driver" option may also mess with things. PR: kern/194884 Reviewed by: jhb, jkim MFC after: 1 week Relnotes: yes Sponsored by: Matt Dillon <dillon@apollo.backplane.com> (hardware)
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, the kernel-modules and the contents of /etc. The ``world'' target should only be used in cases where the source tree has not changed from the currently running version. See: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html for more information, including setting make(1) variables. The ``buildkernel'' and ``installkernel'' targets build and install the kernel and the modules (see below). 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 is a somewhat more involved process, documentation for which can be found at: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html And in the config(8) man page. Note: If you want to build and install the kernel with the ``buildkernel'' and ``installkernel'' targets, you might need to build world before. More information is available in the handbook. The sample kernel configuration files reside in the sys/<arch>/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 NOTES contains entries and documentation for all possible devices, not just those commonly used. It is the successor of the ancient LINT file, but in contrast to LINT, it is not buildable as a kernel but a pure reference and documentation file. Source Roadmap: --------------- bin System/user commands. cddl Various commands and libraries under the Common Development and Distribution License. contrib Packages contributed by 3rd parties. crypto Cryptography 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. kerberos5 Kerberos5 (Heimdal) package. lib System libraries. libexec System daemons. release Release building Makefile & associated tools. rescue Build system for statically linked /rescue utilities. sbin System commands. secure Cryptographic libraries and commands. 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/doc/en_US.ISO8859-1/books/handbook/synching.html