Messages in this thread | | | Subject | Re: [ACPI] [Proposal]Another way to save/restore PCI config space for suspend/resume | From | Hiroshi 2 Itoh <> | Date | Wed, 27 Oct 2004 10:32:18 +0900 |
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Hi,
acpi-devel-admin@lists.sourceforge.net wrote on 2004/10/26 13:50:57:
> Hi, > We suffer from PCI config space issue for a long time, which causes many > system can't correctly resume. Current Linux mechanism isn't sufficient. > Here is a another idea: > Record all PCI writes in Linux kernel, and redo all the write after > resume in order. The idea assumes Firmware will restore all PCI config > space to the boot time state, which is true at least for IA32. >
I think a basic problem of current Linux device model is that there is no effective message path from sibling devices to their root device. Although the message direction from a root device to sibling devices is natural from the viewpoint of device enumeration, the direction from sibling devices to a root device is required for effective arbitration for device configuration and power management.
The Windows driver model uses the direction from sibling drivers to a root bus driver mainly, i.e. sibling drivers are layered on a root bus driver. While we need a kind of callback mechanism from PCI (sibling) devices to PCI bus (root) device instead because their normal call interface is from a root device to sibling devices.
- Hiro.
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