Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

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 00000000000..86b384e4271
--- /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");