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authorJohn Baldwin <jhb@FreeBSD.org>2016-04-27 16:31:12 +0000
committerJohn Baldwin <jhb@FreeBSD.org>2016-04-27 16:31:12 +0000
commit3d0338a09278a0cc38785321f102de9775c57ed3 (patch)
tree1dfb549dd2b02d536680e720de4a0da58313b464 /lib
parenta907c6914c5879870b2597a63253cea0a5b7bdb8 (diff)
downloadsrc-3d0338a09278a0cc38785321f102de9775c57ed3.tar.gz
src-3d0338a09278a0cc38785321f102de9775c57ed3.zip
Implement a PCI bus rescan method.
Rescanning a PCI bus uses the following steps: - Fetch the current set of child devices and save it in the 'devlist' array. - Allocate a parallel array 'unchanged' initalized with NULL pointers. - Scan the bus checking each slot (and each function on slots with a multifunction device). - If a valid function is found, look for a matching device in the 'devlist' array. If a device is found, save the pointer in the 'unchanged' array. If a device is not found, add a new device. - After the scan has finished, walk the 'devlist' array deleting any devices that do not have a matching pointer in the 'unchanged' array. - Finally, fetch an updated set of child devices and explicitly attach any devices that are not present in the 'unchanged' array. This builds on the previous changes to move subclass data management into pci_alloc_devinfo(), pci_child_added(), and bus_child_deleted(). Subclasses of the PCI bus use custom rescan logic explicitly override the rescan method to disable rescans. Differential Revision: https://reviews.freebsd.org/D6018
Notes
Notes: svn path=/head/; revision=298708
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