From a131bfc69bc868083a6c7f9b5dad1331902a3534 Mon Sep 17 00:00:00 2001 From: Oliver O'Halloran Date: Sat, 25 Jul 2020 18:12:31 +1000 Subject: powerpc/eeh: Move PE tree setup into the platform The EEH core has a concept of a "PE tree" to support PowerNV. The PE tree follows the PCI bus structures because a reset asserted on an upstream bridge will be propagated to the downstream bridges. On pseries there's a 1-1 correspondence between what the guest sees are a PHB and a PE so the "tree" is really just a single node. Current the EEH core is reponsible for setting up this PE tree which it does by traversing the pci_dn tree. The structure of the pci_dn tree matches the bus tree on PowerNV which leads to the PE tree being "correct" this setup method doesn't make a whole lot of sense and it's actively confusing for the pseries case where it doesn't really do anything. We want to remove the dependence on pci_dn anyway so this patch move choosing where to insert a new PE into the platform code rather than being part of the generic EEH code. For PowerNV this simplifies the tree building logic and removes the use of pci_dn. For pseries we keep the existing logic. I'm not really convinced it does anything due to the 1-1 PE-to-PHB correspondence so every device under that PHB should be in the same PE, but I'd rather not remove it entirely until we've had a chance to look at it more deeply. Signed-off-by: Oliver O'Halloran Reviewed-by: Alexey Kardashevskiy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200725081231.39076-14-oohall@gmail.com --- arch/powerpc/include/asm/eeh.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/powerpc/include/asm/eeh.h') diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h index ee5f354bc8b9..d5f369bcd130 100644 --- a/arch/powerpc/include/asm/eeh.h +++ b/arch/powerpc/include/asm/eeh.h @@ -283,7 +283,7 @@ struct eeh_pe *eeh_phb_pe_get(struct pci_controller *phb); struct eeh_pe *eeh_pe_next(struct eeh_pe *pe, struct eeh_pe *root); struct eeh_pe *eeh_pe_get(struct pci_controller *phb, int pe_no, int config_addr); -int eeh_pe_tree_insert(struct eeh_dev *edev); +int eeh_pe_tree_insert(struct eeh_dev *edev, struct eeh_pe *new_pe_parent); int eeh_pe_tree_remove(struct eeh_dev *edev); void eeh_pe_update_time_stamp(struct eeh_pe *pe); void *eeh_pe_traverse(struct eeh_pe *root, -- cgit v1.2.3