powerpc/pseries/pci: Add support of MSI domains to PHB hotplug
[linux-2.6-microblaze.git] / arch / powerpc / platforms / pseries / pci_dlpar.c
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
21 struct 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 }
49 EXPORT_SYMBOL_GPL(init_phb_dynamic);
50
51 /* RPA-specific bits for removing PHBs */
52 int 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         /* Remove the PCI bus and unregister the bridge device from sysfs */
82         phb->bus = NULL;
83         pci_remove_bus(b);
84         host_bridge->bus = NULL;
85         device_unregister(&host_bridge->dev);
86
87         /* Now release the IO resource */
88         if (res->flags & IORESOURCE_IO)
89                 release_resource(res);
90
91         /* Release memory resources */
92         for (i = 0; i < 3; ++i) {
93                 res = &phb->mem_resources[i];
94                 if (!(res->flags & IORESOURCE_MEM))
95                         continue;
96                 release_resource(res);
97         }
98
99         /*
100          * The pci_controller data structure is freed by
101          * the pcibios_free_controller_deferred() callback;
102          * see pseries_root_bridge_prepare().
103          */
104
105         return 0;
106 }
107 EXPORT_SYMBOL_GPL(remove_phb_dynamic);