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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/pci/hotplug/rpadlpar_core.c | |
download | kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-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!
Diffstat (limited to 'drivers/pci/hotplug/rpadlpar_core.c')
-rw-r--r-- | drivers/pci/hotplug/rpadlpar_core.c | 503 |
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 0000000..86b384e --- /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"); |