Hi,
I'm in a particular problem where I need to set my custom pcie adapter
into d3hot power-mode and a couple of seconds later reset it back to d0.
The board has an FPGA directly attached to the pcie interface, and as I
need to re-configure the FPGA on the fly, I have to ensure the datalink
layer between the upstream bridge and my device is idle to prevent any
hickups.
On linux I simply do a pci_save_state(device) followed by
pci_set_power_state(device, d3hot), then after my magic on my board, I
do the reverse: pci_set_power_state(device, d0) followed by
pci_restore_state(device).
On FreeBSD, say 8, I've found the pci_set_powerstate function, which is
documented in PCI(9), but that function does not save nor restore the
config space.
I've tried, just for the fun of it, to go via pci_cfg_save(device,
dinfo, 0) with dinfo being device_get_ivars(device) and then
subsequently restoring the config space back via pci_cfg_restore(), but
since both those functions are declared in <dev/pci/pci_private.h> I'm
not sure if I'm supposed to use those directly or not.. Besides, I'm not
really having any luck with that approach.
Reading high and low on the net suggest that not all too many driver
devs are concerned with suspend/resume operation of their device, and if
they are, leave it to user-space to decide when to suspend/resume a
device.. I would like to be able to save off my device' config space,
put it to sleep (d3hot), wake it back up (d0) and restore the device'
config space directly from the device' own driver..
Anyone who can help me with this?
Thanks,
Phil
_______________________________________________
freebsd-hackers@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
