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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pci_dlpar.c (2780B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * PCI Dynamic LPAR, PCI Hot Plug and PCI EEH recovery code
      4 * for RPA-compliant PPC64 platform.
      5 * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
      6 * Copyright (C) 2005 International Business Machines
      7 *
      8 * Updates, 2005, John Rose <johnrose@austin.ibm.com>
      9 * Updates, 2005, Linas Vepstas <linas@austin.ibm.com>
     10 */
     11
     12#include <linux/pci.h>
     13#include <linux/export.h>
     14#include <asm/pci-bridge.h>
     15#include <asm/ppc-pci.h>
     16#include <asm/firmware.h>
     17#include <asm/eeh.h>
     18
     19#include "pseries.h"
     20
     21struct pci_controller *init_phb_dynamic(struct device_node *dn)
     22{
     23	struct pci_controller *phb;
     24
     25	pr_debug("PCI: Initializing new hotplug PHB %pOF\n", dn);
     26
     27	phb = pcibios_alloc_controller(dn);
     28	if (!phb)
     29		return NULL;
     30	rtas_setup_phb(phb);
     31	pci_process_bridge_OF_ranges(phb, dn, 0);
     32	phb->controller_ops = pseries_pci_controller_ops;
     33
     34	pci_devs_phb_init_dynamic(phb);
     35
     36	pseries_msi_allocate_domains(phb);
     37
     38	/* Create EEH devices for the PHB */
     39	eeh_phb_pe_create(phb);
     40
     41	if (dn->child)
     42		pseries_eeh_init_edev_recursive(PCI_DN(dn));
     43
     44	pcibios_scan_phb(phb);
     45	pcibios_finish_adding_to_bus(phb->bus);
     46
     47	return phb;
     48}
     49EXPORT_SYMBOL_GPL(init_phb_dynamic);
     50
     51/* RPA-specific bits for removing PHBs */
     52int remove_phb_dynamic(struct pci_controller *phb)
     53{
     54	struct pci_bus *b = phb->bus;
     55	struct pci_host_bridge *host_bridge = to_pci_host_bridge(b->bridge);
     56	struct resource *res;
     57	int rc, i;
     58
     59	pr_debug("PCI: Removing PHB %04x:%02x...\n",
     60		 pci_domain_nr(b), b->number);
     61
     62	/* We cannot to remove a root bus that has children */
     63	if (!(list_empty(&b->children) && list_empty(&b->devices)))
     64		return -EBUSY;
     65
     66	/* We -know- there aren't any child devices anymore at this stage
     67	 * and thus, we can safely unmap the IO space as it's not in use
     68	 */
     69	res = &phb->io_resource;
     70	if (res->flags & IORESOURCE_IO) {
     71		rc = pcibios_unmap_io_space(b);
     72		if (rc) {
     73			printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
     74			       __func__, b->name);
     75			return 1;
     76		}
     77	}
     78
     79	pseries_msi_free_domains(phb);
     80
     81	/* Keep a reference so phb isn't freed yet */
     82	get_device(&host_bridge->dev);
     83
     84	/* Remove the PCI bus and unregister the bridge device from sysfs */
     85	phb->bus = NULL;
     86	pci_remove_bus(b);
     87	host_bridge->bus = NULL;
     88	device_unregister(&host_bridge->dev);
     89
     90	/* Now release the IO resource */
     91	if (res->flags & IORESOURCE_IO)
     92		release_resource(res);
     93
     94	/* Release memory resources */
     95	for (i = 0; i < 3; ++i) {
     96		res = &phb->mem_resources[i];
     97		if (!(res->flags & IORESOURCE_MEM))
     98			continue;
     99		release_resource(res);
    100	}
    101
    102	/*
    103	 * The pci_controller data structure is freed by
    104	 * the pcibios_free_controller_deferred() callback;
    105	 * see pseries_root_bridge_prepare().
    106	 */
    107	put_device(&host_bridge->dev);
    108
    109	return 0;
    110}
    111EXPORT_SYMBOL_GPL(remove_phb_dynamic);