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are not allocated by the device driver. These resources should still appear allocated from the system's perspective so that their assigned ranges are not reused by other resource requests. The PCI bus driver has used a hack to effect this for a while now where it uses rman_set_device() to assign devices to the PCI bus when they are first encountered and later assigns them to the actual device when a driver allocates a BAR. A few downsides of this approach is that it results in somewhat confusing devinfo -r output as well as not being very easily portable to other bus drivers. This commit adds generic support for "reserved" resources to the resource list API used by many bus drivers to manage the resources of child devices. A resource may be reserved via resource_list_reserve(). This will allocate the resource from the bus' parent without activating it. resource_list_alloc() recognizes an attempt to allocate a reserved resource. When this happens it activates the resource (if requested) and then returns the reserved resource. Similarly, when a reserved resource is released via resource_list_release(), it is deactivated (if it is active) and the resource is then marked reserved again, but is left allocated from the bus' parent. To completely remove a reserved resource, a bus driver may use resource_list_unreserve(). A bus driver may use resource_list_busy() to determine if a reserved resource is allocated by a child device or if it can be unreserved. The PCI bus driver has been changed to use this framework instead of abusing rman_set_device() to keep track of reserved vs allocated resources. Submitted by: imp (an older version many moons ago) MFC after: 1 month |
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| cddl | ||
| contrib | ||
| crypto | ||
| etc | ||
| games | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| lib | ||
| libexec | ||
| release | ||
| rescue | ||
| sbin | ||
| secure | ||
| share | ||
| sys | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| COPYRIGHT | ||
| LOCKS | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| ObsoleteFiles.inc | ||
| 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, 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. 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