3d5134ee83
This rewrites pretty much from scratch the handling of MMIO and PIO space allocations on powerpc64. The main goals are: - Get rid of imalloc and use more common code where possible - Simplify the current mess so that PIO space is allocated and mapped in a single place for PCI bridges - Handle allocation constraints of PIO for all bridges including hot plugged ones within the 2GB space reserved for IO ports, so that devices on hotplugged busses will now work with drivers that assume IO ports fit in an int. - Cleanup and separate tracking of the ISA space in the reserved low 64K of IO space. No ISA -> Nothing mapped there. I booted a cell blade with IDE on PIO and MMIO and a dual G5 so far, that's it :-) With this patch, all allocations are done using the code in mm/vmalloc.c, though we use the low level __get_vm_area with explicit start/stop constraints in order to manage separate areas for vmalloc/vmap, ioremap, and PCI IOs. This greatly simplifies a lot of things, as you can see in the diffstat of that patch :-) A new pair of functions pcibios_map/unmap_io_space() now replace all of the previous code that used to manipulate PCI IOs space. The allocation is done at mapping time, which is now called from scan_phb's, just before the devices are probed (instead of after, which is by itself a bug fix). The only other caller is the PCI hotplug code for hot adding PCI-PCI bridges (slots). imalloc is gone, as is the "sub-allocation" thing, but I do beleive that hotplug should still work in the sense that the space allocation is always done by the PHB, but if you unmap a child bus of this PHB (which seems to be possible), then the code should properly tear down all the HPTE mappings for that area of the PHB allocated IO space. I now always reserve the first 64K of IO space for the bridge with the ISA bus on it. I have moved the code for tracking ISA in a separate file which should also make it smarter if we ever are capable of hot unplugging or re-plugging an ISA bridge. This should have a side effect on platforms like powermac where VGA IOs will no longer work. This is done on purpose though as they would have worked semi-randomly before. The idea at this point is to isolate drivers that might need to access those and fix them by providing a proper function to obtain an offset to the legacy IOs of a given bus. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
479 lines
10 KiB
C
479 lines
10 KiB
C
/*
|
|
* 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 <linux/string.h>
|
|
|
|
#include <asm/pci-bridge.h>
|
|
#include <linux/mutex.h>
|
|
#include <asm/rtas.h>
|
|
#include <asm/vio.h>
|
|
|
|
#include "../pci.h"
|
|
#include "rpaphp.h"
|
|
#include "rpadlpar.h"
|
|
|
|
static DEFINE_MUTEX(rpadlpar_mutex);
|
|
|
|
#define DLPAR_MODULE_NAME "rpadlpar_io"
|
|
|
|
#define NODE_TYPE_VIO 1
|
|
#define NODE_TYPE_SLOT 2
|
|
#define NODE_TYPE_PHB 3
|
|
|
|
static struct device_node *find_vio_slot_node(char *drc_name)
|
|
{
|
|
struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
|
|
struct device_node *dn = NULL;
|
|
char *name;
|
|
int rc;
|
|
|
|
if (!parent)
|
|
return NULL;
|
|
|
|
while ((dn = of_get_next_child(parent, dn))) {
|
|
rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL);
|
|
if ((rc == 0) && (!strcmp(drc_name, name)))
|
|
break;
|
|
}
|
|
|
|
return dn;
|
|
}
|
|
|
|
/* 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_name(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_dlpar_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_vio_slot_node(drc_name);
|
|
if (dn) {
|
|
*node_type = NODE_TYPE_VIO;
|
|
return dn;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* find_php_slot - return hotplug slot structure for device node
|
|
*
|
|
* This routine will return the hotplug slot structure
|
|
* for a given device node. Note that built-in PCI slots
|
|
* may be dlpar-able, but not hot-pluggable, so this routine
|
|
* will return NULL for built-in PCI slots.
|
|
*/
|
|
static struct slot *find_php_slot(struct device_node *dn)
|
|
{
|
|
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 (slot->dn == dn)
|
|
return slot;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
|
|
struct device_node *dev_dn)
|
|
{
|
|
struct pci_dev *tmp = NULL;
|
|
struct device_node *child_dn;
|
|
|
|
list_for_each_entry(tmp, &parent->devices, bus_list) {
|
|
child_dn = pci_device_to_OF_node(tmp);
|
|
if (child_dn == dev_dn)
|
|
return tmp;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void dlpar_pci_add_bus(struct device_node *dn)
|
|
{
|
|
struct pci_dn *pdn = PCI_DN(dn);
|
|
struct pci_controller *phb = pdn->phb;
|
|
struct pci_dev *dev = NULL;
|
|
|
|
eeh_add_device_tree_early(dn);
|
|
|
|
/* Add EADS device to PHB bus, adding new entry to bus->devices */
|
|
dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
|
|
if (!dev) {
|
|
printk(KERN_ERR "%s: failed to create pci dev for %s\n",
|
|
__FUNCTION__, dn->full_name);
|
|
return;
|
|
}
|
|
|
|
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
|
|
dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
|
|
of_scan_pci_bridge(dn, dev);
|
|
|
|
pcibios_fixup_new_pci_devices(dev->subordinate,0);
|
|
|
|
/* Claim new bus resources */
|
|
pcibios_claim_one_bus(dev->bus);
|
|
|
|
/* Map IO space for child bus, which may or may not succeed */
|
|
pcibios_map_io_space(dev->subordinate);
|
|
|
|
/* Add new devices to global lists. Register in proc, sysfs. */
|
|
pci_bus_add_devices(phb->bus);
|
|
}
|
|
|
|
static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
|
|
{
|
|
struct pci_dev *dev;
|
|
struct pci_controller *phb;
|
|
|
|
if (pcibios_find_pci_bus(dn))
|
|
return -EINVAL;
|
|
|
|
/* Add pci bus */
|
|
dlpar_pci_add_bus(dn);
|
|
|
|
/* Confirm new bridge dev was created */
|
|
phb = PCI_DN(dn)->phb;
|
|
dev = dlpar_find_new_dev(phb->bus, dn);
|
|
|
|
if (!dev) {
|
|
printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__,
|
|
drc_name);
|
|
return -EIO;
|
|
}
|
|
|
|
if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
|
|
printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n",
|
|
__FUNCTION__, dev->hdr_type, drc_name);
|
|
return -EIO;
|
|
}
|
|
|
|
/* Add hotplug slot */
|
|
if (rpaphp_add_slot(dn)) {
|
|
printk(KERN_ERR "%s: unable to add hotplug slot %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(char *drc_name, struct device_node *dn)
|
|
{
|
|
struct slot *slot;
|
|
struct pci_dn *pdn;
|
|
int rc = 0;
|
|
|
|
if (!pcibios_find_pci_bus(dn))
|
|
return -EINVAL;
|
|
|
|
/* If pci slot is hotplugable, use hotplug to remove it */
|
|
slot = find_php_slot(dn);
|
|
if (slot) {
|
|
if (rpaphp_deregister_slot(slot)) {
|
|
printk(KERN_ERR
|
|
"%s: unable to remove hotplug slot %s\n",
|
|
__FUNCTION__, drc_name);
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
pdn = dn->data;
|
|
BUG_ON(!pdn || !pdn->phb);
|
|
rc = dlpar_remove_root_bus(pdn->phb);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
pdn->phb = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dlpar_add_phb(char *drc_name, struct device_node *dn)
|
|
{
|
|
struct pci_controller *phb;
|
|
|
|
if (PCI_DN(dn) && PCI_DN(dn)->phb) {
|
|
/* PHB already exists */
|
|
return -EINVAL;
|
|
}
|
|
|
|
phb = init_phb_dynamic(dn);
|
|
if (!phb)
|
|
return -EIO;
|
|
|
|
if (rpaphp_add_slot(dn)) {
|
|
printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
|
|
__FUNCTION__, drc_name);
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn)
|
|
{
|
|
if (vio_find_node(dn))
|
|
return -EINVAL;
|
|
|
|
if (!vio_register_device_node(dn)) {
|
|
printk(KERN_ERR
|
|
"%s: failed to register vio node %s\n",
|
|
__FUNCTION__, drc_name);
|
|
return -EIO;
|
|
}
|
|
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 = -EIO;
|
|
|
|
if (mutex_lock_interruptible(&rpadlpar_mutex))
|
|
return -ERESTARTSYS;
|
|
|
|
/* Find newly added node */
|
|
dn = find_dlpar_node(drc_name, &node_type);
|
|
if (!dn) {
|
|
rc = -ENODEV;
|
|
goto exit;
|
|
}
|
|
|
|
switch (node_type) {
|
|
case NODE_TYPE_VIO:
|
|
rc = dlpar_add_vio_slot(drc_name, dn);
|
|
break;
|
|
case NODE_TYPE_SLOT:
|
|
rc = dlpar_add_pci_slot(drc_name, dn);
|
|
break;
|
|
case NODE_TYPE_PHB:
|
|
rc = dlpar_add_phb(drc_name, dn);
|
|
break;
|
|
}
|
|
|
|
printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
|
|
exit:
|
|
mutex_unlock(&rpadlpar_mutex);
|
|
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
|
|
* -EINVAL Vio dev doesn't exist
|
|
*/
|
|
static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
|
|
{
|
|
struct vio_dev *vio_dev;
|
|
|
|
vio_dev = vio_find_node(dn);
|
|
if (!vio_dev)
|
|
return -EINVAL;
|
|
|
|
vio_unregister_device(vio_dev);
|
|
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(char *drc_name, struct device_node *dn)
|
|
{
|
|
struct pci_bus *bus;
|
|
struct slot *slot;
|
|
|
|
bus = pcibios_find_pci_bus(dn);
|
|
if (!bus)
|
|
return -EINVAL;
|
|
|
|
/* If pci slot is hotplugable, use hotplug to remove it */
|
|
slot = find_php_slot(dn);
|
|
if (slot) {
|
|
if (rpaphp_deregister_slot(slot)) {
|
|
printk(KERN_ERR
|
|
"%s: unable to remove hotplug slot %s\n",
|
|
__FUNCTION__, drc_name);
|
|
return -EIO;
|
|
}
|
|
} else
|
|
pcibios_remove_pci_devices(bus);
|
|
|
|
if (pcibios_unmap_io_space(bus)) {
|
|
printk(KERN_ERR "%s: failed to unmap bus range\n",
|
|
__FUNCTION__);
|
|
return -ERANGE;
|
|
}
|
|
|
|
BUG_ON(!bus->self);
|
|
pci_remove_bus_device(bus->self);
|
|
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 device_node *dn;
|
|
int node_type;
|
|
int rc = 0;
|
|
|
|
if (mutex_lock_interruptible(&rpadlpar_mutex))
|
|
return -ERESTARTSYS;
|
|
|
|
dn = find_dlpar_node(drc_name, &node_type);
|
|
if (!dn) {
|
|
rc = -ENODEV;
|
|
goto exit;
|
|
}
|
|
|
|
switch (node_type) {
|
|
case NODE_TYPE_VIO:
|
|
rc = dlpar_remove_vio_slot(drc_name, dn);
|
|
break;
|
|
case NODE_TYPE_PHB:
|
|
rc = dlpar_remove_phb(drc_name, dn);
|
|
break;
|
|
case NODE_TYPE_SLOT:
|
|
rc = dlpar_remove_pci_slot(drc_name, dn);
|
|
break;
|
|
}
|
|
printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
|
|
exit:
|
|
mutex_unlock(&rpadlpar_mutex);
|
|
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");
|