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| author | Yuji Shimada <shimada-yxb@necst.nec.co.jp> | 2009-03-16 11:13:39 +0300 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-03-20 20:48:15 +0300 |
| commit | 32a9a682bef2f6fce7026bd94d1ce20028b0e52d (patch) | |
| tree | a93225b3039585e8364ae3d411b22f63eebc8d70 /drivers/pci/pci.h | |
| parent | 1c8d7b0a562da06d3ebe83f01b1ed553205d1ae4 (diff) | |
| download | linux-32a9a682bef2f6fce7026bd94d1ce20028b0e52d.tar.xz | |
PCI: allow assignment of memory resources with a specified alignment
This patch allows memory resources to be assigned with a specified
alignment at boot-time or run-time. The patch is useful when we use PCI
pass-through, because page-aligned memory resources are required to
securely share PCI resources with guest drivers.
If you want to assign the resource at boot time, please set
"pci=resource_alignment=" boot parameter.
This is format of "pci=resource_alignment=" boot parameter:
[<order of align>@][<domain>:]<bus>:<slot>.<func>[; ...]
Specifies alignment and device to reassign
aligned memory resources.
If <order of align> is not specified, PAGE_SIZE is
used as alignment.
PCI-PCI bridge can be specified, if resource
windows need to be expanded.
This is example:
pci=resource_alignment=20@07:00.0;18@0f:00.0;00:1d.7
If you want to assign the resource at run-time, please set
"/sys/bus/pci/resource_alignment" file, and hot-remove the device and
hot-add the device. For this purpose, fakephp or PCI hotplug interfaces
can be used.
The format of "/sys/bus/pci/resource_alignment" file is the same with
boot parameter. You can use "," instead of ";".
For example:
# cd /sys/bus/pci
# echo -n 20@12:00.0 > resource_alignment
# echo 1 > devices/0000:12:00.0/remove
# echo 1 > rescan
Reviewed-by: Alex Chiang <achiang@hp.com>
Reviewed-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: Yuji Shimada <shimada-yxb@necst.nec.co.jp>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/pci.h')
| -rw-r--r-- | drivers/pci/pci.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 07c0aa5275e6..2cd1cba7236f 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -195,4 +195,10 @@ static inline int pci_ari_enabled(struct pci_bus *bus) return bus->self && bus->self->ari_enabled; } +#ifdef CONFIG_PCI_QUIRKS +extern int pci_is_reassigndev(struct pci_dev *dev); +resource_size_t pci_specified_resource_alignment(struct pci_dev *dev); +extern void pci_disable_bridge_window(struct pci_dev *dev); +#endif + #endif /* DRIVERS_PCI_H */ |