powerpc/pseries/eeh: Rework device EEH PE determination
The process Linux uses for determining if a device supports EEH or not appears to be at odds with what PAPR says the OS should be doing. The current flow is something like: 1. Assume pe_config_addr is equal the the device's config_addr. 2. Attempt to enable EEH on that PE 3. Verify EEH was enabled (POWER4 bug workaround) 4. Try find the pe_config_addr using the ibm,get-config-addr-info2 RTAS call. 5. If that fails walk the pci_dn tree upwards trying to find a parent device with EEH support. If we find one then add the device to that PE. The first major problem with this process is that we need the PE config address in step 2) since its needs to be passed to the ibm,set-eeh-option RTAS call when enabling EEH for th PE. We hack around this requirement in by making the assumption in 1) and delay finding the actual PE address until 4). This is fine if: a) The PCI device is the 0th function, and b) The device is on the PE's root bus. Granted, the current sequence does appear to work on most systems even when these conditions are false. At a guess PowerVM's RTAS has workarounds to accommodate Linux's quirks or the RTAS call to enable EEH is treated as no-op on most platforms since EEH is usually enabled by default. However, what is currently implemented is a bit sketch and is downright confusing since it doesn't match up with what what PAPR suggests we should be doing. This patch re-works how we handle EEH init so that we find the PE config address using the ibm,get-config-addr-info2 RTAS call first, then use the found address to finish the EEH init process. It also drops the Power4 workaround since as of commit 471d7ff8 ("powerpc/64s: Remove POWER4 support") the kernel does not support running on a Power4 CPU so there's no need to support the Power4 platform's quirks either. With the patch applied the sequence is now: 1. Find the pe_config_addr from the device using the RTAS call. 2. Enable the PE. 3. Insert the edev into the tree and create an eeh_pe if needed. The other change made here is ignoring unsupported devices entirely. Currently the device's BARs are saved to the eeh_dev even if the device is not part of an EEH PE. Not being part of a PE means that an EEH recovery pass will never see that device so the saving the BARs is pointless. Signed-off-by:Oliver O'Halloran <oohall@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200918093050.37344-7-oohall@gmail.com
parent
f61c859f
Please register or sign in to comment