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, 538 insertions, 0 deletions

diff --git a/drivers/pci/hotplug/rpaphp_pci.c b/drivers/pci/hotplug/rpaphp_pci.c
new file mode 100644
index 000000000000..d8305a935aab
--- /dev/null
+++ b/drivers/pci/hotplug/rpaphp_pci.c
@@ -0,0 +1,538 @@
+/*
+ * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
+ * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
+ *
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Send feedback to <lxie@us.ibm.com>
+ *
+ */
+#include <linux/pci.h>
+#include <asm/pci-bridge.h>
+#include <asm/rtas.h>
+#include <asm/machdep.h>
+#include "../pci.h"		/* for pci_add_new_bus */
+
+#include "rpaphp.h"
+
+struct pci_dev *rpaphp_find_pci_dev(struct device_node *dn)
+{
+	struct pci_dev *dev = NULL;
+	char bus_id[BUS_ID_SIZE];
+
+	sprintf(bus_id, "%04x:%02x:%02x.%d", dn->phb->global_number,
+		dn->busno, PCI_SLOT(dn->devfn), PCI_FUNC(dn->devfn));
+	for_each_pci_dev(dev) {
+		if (!strcmp(pci_name(dev), bus_id)) {
+			break;
+		}
+	}
+	return dev;
+}
+
+EXPORT_SYMBOL_GPL(rpaphp_find_pci_dev);
+
+int rpaphp_claim_resource(struct pci_dev *dev, int resource)
+{
+	struct resource *res = &dev->resource[resource];
+	struct resource *root = pci_find_parent_resource(dev, res);
+	char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
+	int err = -EINVAL;
+
+	if (root != NULL) {
+		err = request_resource(root, res);
+	}
+
+	if (err) {
+		err("PCI: %s region %d of %s %s [%lx:%lx]\n",
+		    root ? "Address space collision on" :
+		    "No parent found for",
+		    resource, dtype, pci_name(dev), res->start, res->end);
+	}
+	return err;
+}
+
+EXPORT_SYMBOL_GPL(rpaphp_claim_resource);
+
+static struct pci_dev *rpaphp_find_bridge_pdev(struct slot *slot)
+{
+	return rpaphp_find_pci_dev(slot->dn);
+}
+
+static int rpaphp_get_sensor_state(struct slot *slot, int *state)
+{
+	int rc;
+	int setlevel;
+
+	rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
+
+	if (rc < 0) {
+		if (rc == -EFAULT || rc == -EEXIST) {
+			dbg("%s: slot must be power up to get sensor-state\n",
+			    __FUNCTION__);
+
+			/* some slots have to be powered up 
+			 * before get-sensor will succeed.
+			 */
+			rc = rtas_set_power_level(slot->power_domain, POWER_ON,
+						  &setlevel);
+			if (rc < 0) {
+				dbg("%s: power on slot[%s] failed rc=%d.\n",
+				    __FUNCTION__, slot->name, rc);
+			} else {
+				rc = rtas_get_sensor(DR_ENTITY_SENSE,
+						     slot->index, state);
+			}
+		} else if (rc == -ENODEV)
+			info("%s: slot is unusable\n", __FUNCTION__);
+		else
+			err("%s failed to get sensor state\n", __FUNCTION__);
+	}
+	return rc;
+}
+
+/**
+ * get_pci_adapter_status - get the status of a slot
+ * 
+ * 0-- slot is empty
+ * 1-- adapter is configured
+ * 2-- adapter is not configured
+ * 3-- not valid
+ */
+int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value)
+{
+	int state, rc;
+ 	struct device_node *child_dn;
+ 	struct pci_dev *child_dev = NULL;
+
+	*value = NOT_VALID;
+	rc = rpaphp_get_sensor_state(slot, &state);
+	if (rc)
+		goto exit;
+
+ 	if ((state == EMPTY) || (slot->type == PHB)) {
+ 		dbg("slot is empty\n");
+ 		*value = EMPTY;
+ 	}
+ 	else if (state == PRESENT) {
+		if (!is_init) {
+			/* at run-time slot->state can be changed by */
+			/* config/unconfig adapter */
+			*value = slot->state;
+		} else {
+ 			child_dn = slot->dn->child;
+ 			if (child_dn)
+ 				child_dev = rpaphp_find_pci_dev(child_dn);
+
+ 			if (child_dev)
+ 				*value = CONFIGURED;
+ 			else if (!child_dn)
+				dbg("%s: %s is not valid OFDT node\n",
+				    __FUNCTION__, slot->dn->full_name);
+			else {
+				err("%s: can't find pdev of adapter in slot[%s]\n", 
+					__FUNCTION__, slot->dn->full_name);
+				*value = NOT_CONFIGURED;
+			}
+		}
+	}
+exit:
+	return rc;
+}
+
+/* Must be called before pci_bus_add_devices */
+static void 
+rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
+{
+	struct pci_dev *dev;
+
+	list_for_each_entry(dev, &bus->devices, bus_list) {
+		/*
+		 * Skip already-present devices (which are on the
+		 * global device list.)
+		 */
+		if (list_empty(&dev->global_list)) {
+			int i;
+			
+			/* Need to setup IOMMU tables */
+			ppc_md.iommu_dev_setup(dev);
+
+			if(fix_bus)
+				pcibios_fixup_device_resources(dev, bus);
+			pci_read_irq_line(dev);
+			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);
+			}
+		}
+	}
+}
+
+static int rpaphp_pci_config_bridge(struct pci_dev *dev);
+
+/*****************************************************************************
+ rpaphp_pci_config_slot() will  configure all devices under the 
+ given slot->dn and return the the first pci_dev.
+ *****************************************************************************/
+static struct pci_dev *
+rpaphp_pci_config_slot(struct device_node *dn, struct pci_bus *bus)
+{
+	struct device_node *eads_first_child = dn->child;
+	struct pci_dev *dev = NULL;
+	int num;
+	
+	dbg("Enter %s: dn=%s bus=%s\n", __FUNCTION__, dn->full_name, bus->name);
+
+	if (eads_first_child) {
+		/* pci_scan_slot should find all children of EADs */
+		num = pci_scan_slot(bus, PCI_DEVFN(PCI_SLOT(eads_first_child->devfn), 0));
+		if (num) {
+			rpaphp_fixup_new_pci_devices(bus, 1); 
+			pci_bus_add_devices(bus);
+		}
+		dev = rpaphp_find_pci_dev(eads_first_child);
+		if (!dev) {
+			err("No new device found\n");
+			return NULL;
+		}
+		if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) 
+			rpaphp_pci_config_bridge(dev);
+	}
+	return dev;
+}
+
+static int rpaphp_pci_config_bridge(struct pci_dev *dev)
+{
+	u8 sec_busno;
+	struct pci_bus *child_bus;
+	struct pci_dev *child_dev;
+
+	dbg("Enter %s:  BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev));
+
+	/* get busno of downstream bus */
+	pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
+		
+	/* add to children of PCI bridge dev->bus */
+	child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
+	if (!child_bus) {
+		err("%s: could not add second bus\n", __FUNCTION__);
+		return -EIO;
+	}
+	sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
+	/* do pci_scan_child_bus */
+	pci_scan_child_bus(child_bus);
+
+	list_for_each_entry(child_dev, &child_bus->devices, bus_list) {
+		eeh_add_device_late(child_dev);
+	}
+
+	 /* fixup new pci devices without touching bus struct */
+	rpaphp_fixup_new_pci_devices(child_bus, 0);
+
+	/* Make the discovered devices available */
+	pci_bus_add_devices(child_bus);
+	return 0;
+}
+
+static void enable_eeh(struct device_node *dn)
+{
+	struct device_node *sib;
+
+	for (sib = dn->child; sib; sib = sib->sibling) 
+		enable_eeh(sib);
+	eeh_add_device_early(dn);
+	return;
+	
+}
+
+static void print_slot_pci_funcs(struct slot *slot)
+{
+	struct pci_dev *dev;
+
+	if (slot->dev_type == PCI_DEV) {
+		dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, slot->name);
+		list_for_each_entry (dev, slot->dev.pci_devs, bus_list)
+			dbg("\t%s\n", pci_name(dev));
+	}
+	return;
+}
+
+static int rpaphp_config_pci_adapter(struct slot *slot)
+{
+	struct pci_bus *pci_bus;
+	struct pci_dev *dev;
+	int rc = -ENODEV;
+
+	dbg("Entry %s: slot[%s]\n", __FUNCTION__, slot->name);
+
+	if (slot->bridge) {
+
+		pci_bus = slot->bridge->subordinate;
+		if (!pci_bus) {
+			err("%s: can't find bus structure\n", __FUNCTION__);
+			goto exit;
+		}
+		enable_eeh(slot->dn);
+		dev = rpaphp_pci_config_slot(slot->dn, pci_bus);
+		if (!dev) {
+			err("%s: can't find any devices.\n", __FUNCTION__);
+			goto exit;
+		}
+		print_slot_pci_funcs(slot);
+		rc = 0;
+	} else {
+		/* slot is not enabled */
+		err("slot doesn't have pci_dev structure\n");
+	}
+exit:
+	dbg("Exit %s:  rc=%d\n", __FUNCTION__, rc);
+	return rc;
+}
+
+static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev)
+{
+	eeh_remove_device(dev);
+	if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
+		struct pci_bus *bus = dev->subordinate;
+		struct list_head *ln;
+		if (!bus)
+			return; 
+		for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
+			struct pci_dev *pdev = pci_dev_b(ln);
+			if (pdev)
+				rpaphp_eeh_remove_bus_device(pdev);
+		}
+
+	}
+	return;
+}
+
+int rpaphp_unconfig_pci_adapter(struct slot *slot)
+{
+	struct pci_dev *dev;
+	int retval = 0;
+
+	list_for_each_entry(dev, slot->dev.pci_devs, bus_list)
+		rpaphp_eeh_remove_bus_device(dev);
+
+	pci_remove_behind_bridge(slot->bridge);
+	slot->state = NOT_CONFIGURED;
+	info("%s: devices in slot[%s] unconfigured.\n", __FUNCTION__,
+	     slot->name);
+	return retval;
+}
+
+static int setup_pci_hotplug_slot_info(struct slot *slot)
+{
+	dbg("%s Initilize the PCI slot's hotplug->info structure ...\n",
+	    __FUNCTION__);
+	rpaphp_get_power_status(slot, &slot->hotplug_slot->info->power_status);
+	rpaphp_get_pci_adapter_status(slot, 1,
+				      &slot->hotplug_slot->info->
+				      adapter_status);
+	if (slot->hotplug_slot->info->adapter_status == NOT_VALID) {
+		err("%s: NOT_VALID: skip dn->full_name=%s\n",
+		    __FUNCTION__, slot->dn->full_name);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int set_phb_slot_name(struct slot *slot)
+{
+	struct device_node *dn;
+	struct pci_controller *phb;
+	struct pci_bus *bus;
+
+	dn = slot->dn;
+	if (!dn) {
+		return -EINVAL;
+	}
+	phb = dn->phb;
+	if (!phb) {
+		return -EINVAL;
+	}
+	bus = phb->bus;
+	if (!bus) {
+		return -EINVAL;
+	}
+
+	sprintf(slot->name, "%04x:%02x:%02x.%x", pci_domain_nr(bus),
+			bus->number, 0, 0);
+	return 0;
+}
+
+static int setup_pci_slot(struct slot *slot)
+{
+	struct pci_bus *bus;
+	int rc;
+
+	if (slot->type == PHB) {
+		rc = set_phb_slot_name(slot);
+		if (rc < 0) {
+			err("%s: failed to set phb slot name\n", __FUNCTION__);
+			goto exit_rc;
+		}
+	} else {
+		slot->bridge = rpaphp_find_bridge_pdev(slot);
+		if (!slot->bridge) {
+			/* slot being added doesn't have pci_dev yet */
+			err("%s: no pci_dev for bridge dn %s\n",
+					__FUNCTION__, slot->name);
+			goto exit_rc;
+		}
+
+		bus = slot->bridge->subordinate;
+		if (!bus)
+			goto exit_rc;
+		slot->dev.pci_devs = &bus->devices;
+
+		dbg("%s set slot->name to %s\n",  __FUNCTION__,
+				pci_name(slot->bridge));
+		strcpy(slot->name, pci_name(slot->bridge));
+	}
+
+	/* find slot's pci_dev if it's not empty */
+	if (slot->hotplug_slot->info->adapter_status == EMPTY) {
+		slot->state = EMPTY;	/* slot is empty */
+	} else {
+		/* slot is occupied */
+		if (!(slot->dn->child)) {
+			/* non-empty slot has to have child */
+			err("%s: slot[%s]'s device_node doesn't have child for adapter\n", 
+				__FUNCTION__, slot->name);
+			goto exit_rc;
+		}
+
+		if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) {
+			dbg("%s CONFIGURING pci adapter in slot[%s]\n",  
+				__FUNCTION__, slot->name);
+			if (rpaphp_config_pci_adapter(slot)) {
+				err("%s: CONFIG pci adapter failed\n", __FUNCTION__);
+				goto exit_rc;		
+			}
+
+		} else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) {
+			err("%s: slot[%s]'s adapter_status is NOT_VALID.\n",
+				__FUNCTION__, slot->name);
+			goto exit_rc;
+		}
+		print_slot_pci_funcs(slot);
+		if (!list_empty(slot->dev.pci_devs)) {
+			slot->state = CONFIGURED;
+		} else {
+			/* DLPAR add as opposed to 
+		 	 * boot time */
+			slot->state = NOT_CONFIGURED;
+		}
+	}
+	return 0;
+exit_rc:
+	dealloc_slot_struct(slot);
+	return -EINVAL;
+}
+
+int register_pci_slot(struct slot *slot)
+{
+	int rc = -EINVAL;
+
+	slot->dev_type = PCI_DEV;
+	if ((slot->type == EMBEDDED) || (slot->type == PHB))
+		slot->removable = 0;
+	else
+		slot->removable = 1;
+	if (setup_pci_hotplug_slot_info(slot))
+		goto exit_rc;
+	if (setup_pci_slot(slot))
+		goto exit_rc;
+	rc = register_slot(slot);
+exit_rc:
+	return rc;
+}
+
+int rpaphp_enable_pci_slot(struct slot *slot)
+{
+	int retval = 0, state;
+
+	retval = rpaphp_get_sensor_state(slot, &state);
+	if (retval)
+		goto exit;
+	dbg("%s: sensor state[%d]\n", __FUNCTION__, state);
+	/* if slot is not empty, enable the adapter */
+	if (state == PRESENT) {
+		dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name);
+		retval = rpaphp_config_pci_adapter(slot);
+		if (!retval) {
+			slot->state = CONFIGURED;
+			dbg("%s: PCI devices in slot[%s] has been configured\n", 
+				__FUNCTION__, slot->name);
+		} else {
+			slot->state = NOT_CONFIGURED;
+			dbg("%s: no pci_dev struct for adapter in slot[%s]\n",
+			    __FUNCTION__, slot->name);
+		}
+	} else if (state == EMPTY) {
+		dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name);
+		slot->state = EMPTY;
+	} else {
+		err("%s: slot[%s] is in invalid state\n", __FUNCTION__,
+		    slot->name);
+		slot->state = NOT_VALID;
+		retval = -EINVAL;
+	}
+exit:
+	dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
+	return retval;
+}
+
+struct hotplug_slot *rpaphp_find_hotplug_slot(struct pci_dev *dev)
+{
+	struct list_head	*tmp, *n;
+	struct slot		*slot;
+
+	list_for_each_safe(tmp, n, &rpaphp_slot_head) {
+		struct pci_bus *bus;
+		struct list_head *ln;
+
+		slot = list_entry(tmp, struct slot, rpaphp_slot_list);
+		if (slot->bridge == NULL) {
+			if (slot->dev_type == PCI_DEV) {
+				printk(KERN_WARNING "PCI slot missing bridge %s %s \n", 
+				                    slot->name, slot->location);
+			}
+			continue;
+		}
+
+		bus = slot->bridge->subordinate;
+		if (!bus) {
+			continue;  /* should never happen? */
+		}
+		for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
+                                struct pci_dev *pdev = pci_dev_b(ln);
+				if (pdev == dev)
+					return slot->hotplug_slot;
+		}
+	}
+
+	return NULL;
+}
+
+EXPORT_SYMBOL_GPL(rpaphp_find_hotplug_slot);