summaryrefslogtreecommitdiff
path: root/drivers/pci/hotplug/rpadlpar_core.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/pci/hotplug/rpadlpar_core.c')
-rw-r--r--drivers/pci/hotplug/rpadlpar_core.c503
1 files changed, 503 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/rpadlpar_core.c b/drivers/pci/hotplug/rpadlpar_core.c
new file mode 100644
index 000000000000..86b384e42717
--- /dev/null
+++ b/drivers/pci/hotplug/rpadlpar_core.c
@@ -0,0 +1,503 @@
+/*
+ * Interface for Dynamic Logical Partitioning of I/O Slots on
+ * RPA-compliant PPC64 platform.
+ *
+ * John Rose <johnrose@austin.ibm.com>
+ * Linda Xie <lxie@us.ibm.com>
+ *
+ * October 2003
+ *
+ * Copyright (C) 2003 IBM.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <asm/pci-bridge.h>
+#include <asm/semaphore.h>
+#include <asm/rtas.h>
+#include "../pci.h"
+#include "rpaphp.h"
+#include "rpadlpar.h"
+
+static DECLARE_MUTEX(rpadlpar_sem);
+
+#define NODE_TYPE_VIO 1
+#define NODE_TYPE_SLOT 2
+#define NODE_TYPE_PHB 3
+
+static struct device_node *find_php_slot_vio_node(char *drc_name)
+{
+ struct device_node *child;
+ struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
+ char *loc_code;
+
+ if (!parent)
+ return NULL;
+
+ for (child = of_get_next_child(parent, NULL);
+ child; child = of_get_next_child(parent, child)) {
+ loc_code = get_property(child, "ibm,loc-code", NULL);
+ if (loc_code && !strncmp(loc_code, drc_name, strlen(drc_name)))
+ return child;
+ }
+
+ return NULL;
+}
+
+/* Find dlpar-capable pci node that contains the specified name and type */
+static struct device_node *find_php_slot_pci_node(char *drc_name,
+ char *drc_type)
+{
+ struct device_node *np = NULL;
+ char *name;
+ char *type;
+ int rc;
+
+ while ((np = of_find_node_by_type(np, "pci"))) {
+ rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL);
+ if (rc == 0)
+ if (!strcmp(drc_name, name) && !strcmp(drc_type, type))
+ break;
+ }
+
+ return np;
+}
+
+static struct device_node *find_newly_added_node(char *drc_name, int *node_type)
+{
+ struct device_node *dn;
+
+ dn = find_php_slot_pci_node(drc_name, "SLOT");
+ if (dn) {
+ *node_type = NODE_TYPE_SLOT;
+ return dn;
+ }
+
+ dn = find_php_slot_pci_node(drc_name, "PHB");
+ if (dn) {
+ *node_type = NODE_TYPE_PHB;
+ return dn;
+ }
+
+ dn = find_php_slot_vio_node(drc_name);
+ if (dn) {
+ *node_type = NODE_TYPE_VIO;
+ return dn;
+ }
+
+ return NULL;
+}
+
+static struct slot *find_slot(char *drc_name)
+{
+ struct list_head *tmp, *n;
+ struct slot *slot;
+
+ list_for_each_safe(tmp, n, &rpaphp_slot_head) {
+ slot = list_entry(tmp, struct slot, rpaphp_slot_list);
+ if (strcmp(slot->location, drc_name) == 0)
+ return slot;
+ }
+
+ return NULL;
+}
+
+static void rpadlpar_claim_one_bus(struct pci_bus *b)
+{
+ struct list_head *ld;
+ struct pci_bus *child_bus;
+
+ for (ld = b->devices.next; ld != &b->devices; ld = ld->next) {
+ struct pci_dev *dev = pci_dev_b(ld);
+ int i;
+
+ for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+ struct resource *r = &dev->resource[i];
+
+ if (r->parent || !r->start || !r->flags)
+ continue;
+ rpaphp_claim_resource(dev, i);
+ }
+ }
+
+ list_for_each_entry(child_bus, &b->children, node)
+ rpadlpar_claim_one_bus(child_bus);
+}
+
+static int pci_add_secondary_bus(struct device_node *dn,
+ struct pci_dev *bridge_dev)
+{
+ struct pci_controller *hose = dn->phb;
+ struct pci_bus *child;
+ u8 sec_busno;
+
+ /* Get busno of downstream bus */
+ pci_read_config_byte(bridge_dev, PCI_SECONDARY_BUS, &sec_busno);
+
+ /* Allocate and add to children of bridge_dev->bus */
+ child = pci_add_new_bus(bridge_dev->bus, bridge_dev, sec_busno);
+ if (!child) {
+ printk(KERN_ERR "%s: could not add secondary bus\n", __FUNCTION__);
+ return -ENOMEM;
+ }
+
+ sprintf(child->name, "PCI Bus #%02x", child->number);
+
+ /* Fixup subordinate bridge bases and resources */
+ pcibios_fixup_bus(child);
+
+ /* Claim new bus resources */
+ rpadlpar_claim_one_bus(bridge_dev->bus);
+
+ if (hose->last_busno < child->number)
+ hose->last_busno = child->number;
+
+ dn->bussubno = child->number;
+
+ /* ioremap() for child bus, which may or may not succeed */
+ remap_bus_range(child);
+
+ return 0;
+}
+
+static struct pci_dev *dlpar_pci_add_bus(struct device_node *dn)
+{
+ struct pci_controller *hose = dn->phb;
+ struct pci_dev *dev = NULL;
+
+ /* Scan phb bus for EADS device, adding new one to bus->devices */
+ if (!pci_scan_single_device(hose->bus, dn->devfn)) {
+ printk(KERN_ERR "%s: found no device on bus\n", __FUNCTION__);
+ return NULL;
+ }
+
+ /* Add new devices to global lists. Register in proc, sysfs. */
+ pci_bus_add_devices(hose->bus);
+
+ /* Confirm new bridge dev was created */
+ dev = rpaphp_find_pci_dev(dn);
+ if (!dev) {
+ printk(KERN_ERR "%s: failed to add pci device\n", __FUNCTION__);
+ return NULL;
+ }
+
+ if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
+ printk(KERN_ERR "%s: unexpected header type %d\n",
+ __FUNCTION__, dev->hdr_type);
+ return NULL;
+ }
+
+ if (pci_add_secondary_bus(dn, dev))
+ return NULL;
+
+ return dev;
+}
+
+static int dlpar_pci_remove_bus(struct pci_dev *bridge_dev)
+{
+ struct pci_bus *secondary_bus;
+
+ if (!bridge_dev) {
+ printk(KERN_ERR "%s: unexpected null device\n",
+ __FUNCTION__);
+ return -EINVAL;
+ }
+
+ secondary_bus = bridge_dev->subordinate;
+
+ if (unmap_bus_range(secondary_bus)) {
+ printk(KERN_ERR "%s: failed to unmap bus range\n",
+ __FUNCTION__);
+ return -ERANGE;
+ }
+
+ pci_remove_bus_device(bridge_dev);
+ return 0;
+}
+
+static inline int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
+{
+ struct pci_dev *dev;
+
+ /* Add pci bus */
+ dev = dlpar_pci_add_bus(dn);
+ if (!dev) {
+ printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__,
+ drc_name);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int dlpar_remove_root_bus(struct pci_controller *phb)
+{
+ struct pci_bus *phb_bus;
+ int rc;
+
+ phb_bus = phb->bus;
+ if (!(list_empty(&phb_bus->children) &&
+ list_empty(&phb_bus->devices))) {
+ return -EBUSY;
+ }
+
+ rc = pcibios_remove_root_bus(phb);
+ if (rc)
+ return -EIO;
+
+ device_unregister(phb_bus->bridge);
+ pci_remove_bus(phb_bus);
+
+ return 0;
+}
+
+static int dlpar_remove_phb(struct slot *slot)
+{
+ struct pci_controller *phb;
+ struct device_node *dn;
+ int rc = 0;
+
+ dn = slot->dn;
+ if (!dn) {
+ printk(KERN_ERR "%s: unexpected NULL slot device node\n",
+ __FUNCTION__);
+ return -EIO;
+ }
+
+ phb = dn->phb;
+ if (!phb) {
+ printk(KERN_ERR "%s: unexpected NULL phb pointer\n",
+ __FUNCTION__);
+ return -EIO;
+ }
+
+ if (rpaphp_remove_slot(slot)) {
+ printk(KERN_ERR "%s: unable to remove hotplug slot %s\n",
+ __FUNCTION__, slot->location);
+ return -EIO;
+ }
+
+ rc = dlpar_remove_root_bus(phb);
+ if (rc < 0)
+ return rc;
+
+ return 0;
+}
+
+static int dlpar_add_phb(struct device_node *dn)
+{
+ struct pci_controller *phb;
+
+ phb = init_phb_dynamic(dn);
+ if (!phb)
+ return -EINVAL;
+
+ return 0;
+}
+
+/**
+ * dlpar_add_slot - DLPAR add an I/O Slot
+ * @drc_name: drc-name of newly added slot
+ *
+ * Make the hotplug module and the kernel aware
+ * of a newly added I/O Slot.
+ * Return Codes -
+ * 0 Success
+ * -ENODEV Not a valid drc_name
+ * -EINVAL Slot already added
+ * -ERESTARTSYS Signalled before obtaining lock
+ * -EIO Internal PCI Error
+ */
+int dlpar_add_slot(char *drc_name)
+{
+ struct device_node *dn = NULL;
+ int node_type;
+ int rc = 0;
+
+ if (down_interruptible(&rpadlpar_sem))
+ return -ERESTARTSYS;
+
+ /* Check for existing hotplug slot */
+ if (find_slot(drc_name)) {
+ rc = -EINVAL;
+ goto exit;
+ }
+
+ dn = find_newly_added_node(drc_name, &node_type);
+ if (!dn) {
+ rc = -ENODEV;
+ goto exit;
+ }
+
+ switch (node_type) {
+ case NODE_TYPE_VIO:
+ /* Just add hotplug slot */
+ break;
+ case NODE_TYPE_SLOT:
+ rc = dlpar_add_pci_slot(drc_name, dn);
+ break;
+ case NODE_TYPE_PHB:
+ rc = dlpar_add_phb(dn);
+ break;
+ default:
+ printk("%s: unexpected node type\n", __FUNCTION__);
+ return -EIO;
+ }
+
+ if (!rc && rpaphp_add_slot(dn)) {
+ printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
+ __FUNCTION__, drc_name);
+ rc = -EIO;
+ }
+exit:
+ up(&rpadlpar_sem);
+ return rc;
+}
+
+/**
+ * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
+ * @drc_name: drc-name of newly added slot
+ *
+ * Remove the kernel and hotplug representations
+ * of an I/O Slot.
+ * Return Codes:
+ * 0 Success
+ * -EIO Internal Error
+ */
+int dlpar_remove_vio_slot(struct slot *slot, char *drc_name)
+{
+ /* Remove hotplug slot */
+
+ if (rpaphp_remove_slot(slot)) {
+ printk(KERN_ERR "%s: unable to remove hotplug slot %s\n",
+ __FUNCTION__, drc_name);
+ return -EIO;
+ }
+ return 0;
+}
+
+/**
+ * dlpar_remove_slot - DLPAR remove a PCI I/O Slot
+ * @drc_name: drc-name of newly added slot
+ *
+ * Remove the kernel and hotplug representations
+ * of a PCI I/O Slot.
+ * Return Codes:
+ * 0 Success
+ * -ENODEV Not a valid drc_name
+ * -EIO Internal PCI Error
+ */
+int dlpar_remove_pci_slot(struct slot *slot, char *drc_name)
+{
+ struct pci_dev *bridge_dev;
+
+ bridge_dev = slot->bridge;
+ if (!bridge_dev) {
+ printk(KERN_ERR "%s: unexpected null bridge device\n",
+ __FUNCTION__);
+ return -EIO;
+ }
+
+ /* Remove hotplug slot */
+ if (rpaphp_remove_slot(slot)) {
+ printk(KERN_ERR "%s: unable to remove hotplug slot %s\n",
+ __FUNCTION__, drc_name);
+ return -EIO;
+ }
+
+ /* Remove pci bus */
+
+ if (dlpar_pci_remove_bus(bridge_dev)) {
+ printk(KERN_ERR "%s: unable to remove pci bus %s\n",
+ __FUNCTION__, drc_name);
+ return -EIO;
+ }
+ return 0;
+}
+
+/**
+ * dlpar_remove_slot - DLPAR remove an I/O Slot
+ * @drc_name: drc-name of newly added slot
+ *
+ * Remove the kernel and hotplug representations
+ * of an I/O Slot.
+ * Return Codes:
+ * 0 Success
+ * -ENODEV Not a valid drc_name
+ * -EINVAL Slot already removed
+ * -ERESTARTSYS Signalled before obtaining lock
+ * -EIO Internal Error
+ */
+int dlpar_remove_slot(char *drc_name)
+{
+ struct slot *slot;
+ int rc = 0;
+
+ if (down_interruptible(&rpadlpar_sem))
+ return -ERESTARTSYS;
+
+ if (!find_php_slot_vio_node(drc_name) &&
+ !find_php_slot_pci_node(drc_name, "SLOT") &&
+ !find_php_slot_pci_node(drc_name, "PHB")) {
+ rc = -ENODEV;
+ goto exit;
+ }
+
+ slot = find_slot(drc_name);
+ if (!slot) {
+ rc = -EINVAL;
+ goto exit;
+ }
+
+ if (slot->type == PHB) {
+ rc = dlpar_remove_phb(slot);
+ } else {
+ switch (slot->dev_type) {
+ case PCI_DEV:
+ rc = dlpar_remove_pci_slot(slot, drc_name);
+ break;
+
+ case VIO_DEV:
+ rc = dlpar_remove_vio_slot(slot, drc_name);
+ break;
+ }
+ }
+exit:
+ up(&rpadlpar_sem);
+ return rc;
+}
+
+static inline int is_dlpar_capable(void)
+{
+ int rc = rtas_token("ibm,configure-connector");
+
+ return (int) (rc != RTAS_UNKNOWN_SERVICE);
+}
+
+int __init rpadlpar_io_init(void)
+{
+ int rc = 0;
+
+ if (!is_dlpar_capable()) {
+ printk(KERN_WARNING "%s: partition not DLPAR capable\n",
+ __FUNCTION__);
+ return -EPERM;
+ }
+
+ rc = dlpar_sysfs_init();
+ return rc;
+}
+
+void rpadlpar_io_exit(void)
+{
+ dlpar_sysfs_exit();
+ return;
+}
+
+module_init(rpadlpar_io_init);
+module_exit(rpadlpar_io_exit);
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 10:28:52 +0000