cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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rpaphp_slot.c (2747B)

      1// SPDX-License-Identifier: GPL-2.0+
      2/*
      3 * RPA Virtual I/O device functions
      4 * Copyright (C) 2004 Linda Xie <lxie@us.ibm.com>
      5 *
      6 * All rights reserved.
      7 *
      8 * Send feedback to <lxie@us.ibm.com>
      9 *
     10 */
     11#include <linux/kernel.h>
     12#include <linux/module.h>
     13#include <linux/sysfs.h>
     14#include <linux/of.h>
     15#include <linux/pci.h>
     16#include <linux/string.h>
     17#include <linux/slab.h>
     18
     19#include <asm/rtas.h>
     20#include "rpaphp.h"
     21
     22/* free up the memory used by a slot */
     23void dealloc_slot_struct(struct slot *slot)
     24{
     25	of_node_put(slot->dn);
     26	kfree(slot->name);
     27	kfree(slot);
     28}
     29
     30struct slot *alloc_slot_struct(struct device_node *dn,
     31		int drc_index, char *drc_name, int power_domain)
     32{
     33	struct slot *slot;
     34
     35	slot = kzalloc(sizeof(struct slot), GFP_KERNEL);
     36	if (!slot)
     37		goto error_nomem;
     38	slot->name = kstrdup(drc_name, GFP_KERNEL);
     39	if (!slot->name)
     40		goto error_slot;
     41	slot->dn = of_node_get(dn);
     42	slot->index = drc_index;
     43	slot->power_domain = power_domain;
     44	slot->hotplug_slot.ops = &rpaphp_hotplug_slot_ops;
     45
     46	return (slot);
     47
     48error_slot:
     49	kfree(slot);
     50error_nomem:
     51	return NULL;
     52}
     53
     54static int is_registered(struct slot *slot)
     55{
     56	struct slot *tmp_slot;
     57
     58	list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
     59		if (!strcmp(tmp_slot->name, slot->name))
     60			return 1;
     61	}
     62	return 0;
     63}
     64
     65int rpaphp_deregister_slot(struct slot *slot)
     66{
     67	int retval = 0;
     68	struct hotplug_slot *php_slot = &slot->hotplug_slot;
     69
     70	 dbg("%s - Entry: deregistering slot=%s\n",
     71		__func__, slot->name);
     72
     73	list_del(&slot->rpaphp_slot_list);
     74	pci_hp_deregister(php_slot);
     75	dealloc_slot_struct(slot);
     76
     77	dbg("%s - Exit: rc[%d]\n", __func__, retval);
     78	return retval;
     79}
     80EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);
     81
     82int rpaphp_register_slot(struct slot *slot)
     83{
     84	struct hotplug_slot *php_slot = &slot->hotplug_slot;
     85	struct device_node *child;
     86	u32 my_index;
     87	int retval;
     88	int slotno = -1;
     89
     90	dbg("%s registering slot:path[%pOF] index[%x], name[%s] pdomain[%x] type[%d]\n",
     91		__func__, slot->dn, slot->index, slot->name,
     92		slot->power_domain, slot->type);
     93
     94	/* should not try to register the same slot twice */
     95	if (is_registered(slot)) {
     96		err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
     97		return -EAGAIN;
     98	}
     99
    100	for_each_child_of_node(slot->dn, child) {
    101		retval = of_property_read_u32(child, "ibm,my-drc-index", &my_index);
    102		if (my_index == slot->index) {
    103			slotno = PCI_SLOT(PCI_DN(child)->devfn);
    104			of_node_put(child);
    105			break;
    106		}
    107	}
    108
    109	retval = pci_hp_register(php_slot, slot->bus, slotno, slot->name);
    110	if (retval) {
    111		err("pci_hp_register failed with error %d\n", retval);
    112		return retval;
    113	}
    114
    115	/* add slot to our internal list */
    116	list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
    117	info("Slot [%s] registered\n", slot->name);
    118	return 0;
    119}