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b6eebb093c
The eeh_ops->probe() function is called from two different contexts: 1. On pseries, where we set EEH_PROBE_MODE_DEVTREE, it's called in eeh_add_device_early() which is supposed to run before we create a pci_dev. 2. On PowerNV, where we set EEH_PROBE_MODE_DEV, it's called in eeh_device_add_late() which is supposed to run *after* the pci_dev is created. The "early" probe is required because PAPR requires that we perform an RTAS call to enable EEH support on a device before we start interacting with it via config space or MMIO. This requirement doesn't exist on PowerNV and shoehorning two completely separate initialisation paths into a common interface just results in a convoluted code everywhere. Additionally the early probe requires the probe function to take an pci_dn rather than a pci_dev argument. We'd like to make pci_dn a pseries specific data structure since there's no real requirement for them on PowerNV. To help both goals move the early probe into the pseries containment zone so the platform depedence is more explicit. Reviewed-by: Sam Bobroff <sbobroff@linux.ibm.com> Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200306073904.4737-5-oohall@gmail.com
116 lines
2.7 KiB
C
116 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
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* Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
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*
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* All rights reserved.
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*
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* Send feedback to <lxie@us.ibm.com>
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*
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*/
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#include <linux/pci.h>
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#include <linux/string.h>
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#include <asm/pci-bridge.h>
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#include <asm/rtas.h>
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#include <asm/machdep.h>
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#include "../pci.h" /* for pci_add_new_bus */
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#include "rpaphp.h"
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int rpaphp_get_sensor_state(struct slot *slot, int *state)
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{
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int rc;
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int setlevel;
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rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
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if (rc < 0) {
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if (rc == -EFAULT || rc == -EEXIST) {
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dbg("%s: slot must be power up to get sensor-state\n",
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__func__);
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/* some slots have to be powered up
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* before get-sensor will succeed.
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*/
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rc = rtas_set_power_level(slot->power_domain, POWER_ON,
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&setlevel);
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if (rc < 0) {
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dbg("%s: power on slot[%s] failed rc=%d.\n",
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__func__, slot->name, rc);
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} else {
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rc = rtas_get_sensor(DR_ENTITY_SENSE,
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slot->index, state);
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}
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} else if (rc == -ENODEV)
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info("%s: slot is unusable\n", __func__);
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else
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err("%s failed to get sensor state\n", __func__);
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}
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return rc;
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}
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/**
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* rpaphp_enable_slot - record slot state, config pci device
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* @slot: target &slot
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*
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* Initialize values in the slot structure to indicate if there is a pci card
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* plugged into the slot. If the slot is not empty, run the pcibios routine
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* to get pcibios stuff correctly set up.
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*/
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int rpaphp_enable_slot(struct slot *slot)
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{
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int rc, level, state;
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struct pci_bus *bus;
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slot->state = EMPTY;
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/* Find out if the power is turned on for the slot */
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rc = rtas_get_power_level(slot->power_domain, &level);
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if (rc)
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return rc;
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/* Figure out if there is an adapter in the slot */
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rc = rpaphp_get_sensor_state(slot, &state);
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if (rc)
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return rc;
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bus = pci_find_bus_by_node(slot->dn);
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if (!bus) {
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err("%s: no pci_bus for dn %pOF\n", __func__, slot->dn);
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return -EINVAL;
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}
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slot->bus = bus;
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slot->pci_devs = &bus->devices;
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/* if there's an adapter in the slot, go add the pci devices */
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if (state == PRESENT) {
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slot->state = NOT_CONFIGURED;
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/* non-empty slot has to have child */
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if (!slot->dn->child) {
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err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
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__func__, slot->name);
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return -EINVAL;
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}
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if (list_empty(&bus->devices)) {
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pseries_eeh_init_edev_recursive(PCI_DN(slot->dn));
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pci_hp_add_devices(bus);
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}
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if (!list_empty(&bus->devices)) {
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slot->state = CONFIGURED;
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}
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if (rpaphp_debug) {
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struct pci_dev *dev;
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dbg("%s: pci_devs of slot[%pOF]\n", __func__, slot->dn);
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list_for_each_entry(dev, &bus->devices, bus_list)
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dbg("\t%s\n", pci_name(dev));
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}
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}
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return 0;
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}
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