Commit fd6852c8 authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt Committed by Paul Mackerras

powerpc/pci: Fix various pseries PCI hotplug issues

The pseries PCI hotplug code has a number of issues, ranging from
incorrect resource setup to crashes, depending on what is added,
when, whether it contains a bridge, etc etc....

This fixes a whole bunch of these, while actually simplifying the code
a bit, using more generic code in the process and factoring out common
code between adding of a PHB, a slot or a device.
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent b5ae5f91
......@@ -241,9 +241,6 @@ extern void pcibios_remove_pci_devices(struct pci_bus *bus);
/** Discover new pci devices under this bus, and add them */
extern void pcibios_add_pci_devices(struct pci_bus *bus);
extern void pcibios_fixup_new_pci_devices(struct pci_bus *bus);
extern int pcibios_remove_root_bus(struct pci_controller *phb);
static inline struct pci_controller *pci_bus_to_host(const struct pci_bus *bus)
{
......
......@@ -204,15 +204,14 @@ static inline struct resource *pcibios_select_root(struct pci_dev *pdev,
return root;
}
extern void pcibios_setup_new_device(struct pci_dev *dev);
extern void pcibios_claim_one_bus(struct pci_bus *b);
extern void pcibios_allocate_bus_resources(struct pci_bus *bus);
extern void pcibios_finish_adding_to_bus(struct pci_bus *bus);
extern void pcibios_resource_survey(void);
extern struct pci_controller *init_phb_dynamic(struct device_node *dn);
extern int remove_phb_dynamic(struct pci_controller *phb);
extern struct pci_dev *of_create_pci_dev(struct device_node *node,
struct pci_bus *bus, int devfn);
......
......@@ -203,7 +203,7 @@ char __devinit *pcibios_setup(char *str)
return str;
}
void __devinit pcibios_setup_new_device(struct pci_dev *dev)
static void __devinit pcibios_setup_new_device(struct pci_dev *dev)
{
struct dev_archdata *sd = &dev->dev.archdata;
......@@ -221,7 +221,6 @@ void __devinit pcibios_setup_new_device(struct pci_dev *dev)
if (ppc_md.pci_dma_dev_setup)
ppc_md.pci_dma_dev_setup(dev);
}
EXPORT_SYMBOL(pcibios_setup_new_device);
/*
* Reads the interrupt pin to determine if interrupt is use by card.
......@@ -1397,9 +1396,10 @@ void __init pcibios_resource_survey(void)
#ifdef CONFIG_HOTPLUG
/* This is used by the pSeries hotplug driver to allocate resource
/* This is used by the PCI hotplug driver to allocate resource
* of newly plugged busses. We can try to consolidate with the
* rest of the code later, for now, keep it as-is
* rest of the code later, for now, keep it as-is as our main
* resource allocation function doesn't deal with sub-trees yet.
*/
void __devinit pcibios_claim_one_bus(struct pci_bus *bus)
{
......@@ -1414,6 +1414,14 @@ void __devinit pcibios_claim_one_bus(struct pci_bus *bus)
if (r->parent || !r->start || !r->flags)
continue;
pr_debug("PCI: Claiming %s: "
"Resource %d: %016llx..%016llx [%x]\n",
pci_name(dev), i,
(unsigned long long)r->start,
(unsigned long long)r->end,
(unsigned int)r->flags);
pci_claim_resource(dev, i);
}
}
......@@ -1422,6 +1430,31 @@ void __devinit pcibios_claim_one_bus(struct pci_bus *bus)
pcibios_claim_one_bus(child_bus);
}
EXPORT_SYMBOL_GPL(pcibios_claim_one_bus);
/* pcibios_finish_adding_to_bus
*
* This is to be called by the hotplug code after devices have been
* added to a bus, this include calling it for a PHB that is just
* being added
*/
void pcibios_finish_adding_to_bus(struct pci_bus *bus)
{
pr_debug("PCI: Finishing adding to hotplug bus %04x:%02x\n",
pci_domain_nr(bus), bus->number);
/* Allocate bus and devices resources */
pcibios_allocate_bus_resources(bus);
pcibios_claim_one_bus(bus);
/* Add new devices to global lists. Register in proc, sysfs. */
pci_bus_add_devices(bus);
/* Fixup EEH */
eeh_add_device_tree_late(bus);
}
EXPORT_SYMBOL_GPL(pcibios_finish_adding_to_bus);
#endif /* CONFIG_HOTPLUG */
int pcibios_enable_device(struct pci_dev *dev, int mask)
......
......@@ -301,51 +301,3 @@ void __init find_and_init_phbs(void)
#endif /* CONFIG_PPC32 */
}
}
/* RPA-specific bits for removing PHBs */
int pcibios_remove_root_bus(struct pci_controller *phb)
{
struct pci_bus *b = phb->bus;
struct resource *res;
int rc, i;
res = b->resource[0];
if (!res->flags) {
printk(KERN_ERR "%s: no IO resource for PHB %s\n", __func__,
b->name);
return 1;
}
rc = pcibios_unmap_io_space(b);
if (rc) {
printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
__func__, b->name);
return 1;
}
if (release_resource(res)) {
printk(KERN_ERR "%s: failed to release IO on bus %s\n",
__func__, b->name);
return 1;
}
for (i = 1; i < 3; ++i) {
res = b->resource[i];
if (!res->flags && i == 0) {
printk(KERN_ERR "%s: no MEM resource for PHB %s\n",
__func__, b->name);
return 1;
}
if (res->flags && release_resource(res)) {
printk(KERN_ERR
"%s: failed to release IO %d on bus %s\n",
__func__, i, b->name);
return 1;
}
}
pcibios_free_controller(phb);
return 0;
}
EXPORT_SYMBOL(pcibios_remove_root_bus);
......@@ -25,6 +25,8 @@
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#undef DEBUG
#include <linux/pci.h>
#include <asm/pci-bridge.h>
#include <asm/ppc-pci.h>
......@@ -69,74 +71,25 @@ EXPORT_SYMBOL_GPL(pcibios_find_pci_bus);
* Remove all of the PCI devices under this bus both from the
* linux pci device tree, and from the powerpc EEH address cache.
*/
void
pcibios_remove_pci_devices(struct pci_bus *bus)
void pcibios_remove_pci_devices(struct pci_bus *bus)
{
struct pci_dev *dev, *tmp;
struct pci_dev *dev, *tmp;
struct pci_bus *child_bus;
/* First go down child busses */
list_for_each_entry(child_bus, &bus->children, node)
pcibios_remove_pci_devices(child_bus);
pr_debug("PCI: Removing devices on bus %04x:%02x\n",
pci_domain_nr(bus), bus->number);
list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
pr_debug(" * Removing %s...\n", pci_name(dev));
eeh_remove_bus_device(dev);
pci_remove_bus_device(dev);
}
pci_remove_bus_device(dev);
}
}
EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices);
/* Must be called before pci_bus_add_devices */
void
pcibios_fixup_new_pci_devices(struct pci_bus *bus)
{
struct pci_dev *dev;
list_for_each_entry(dev, &bus->devices, bus_list) {
/* Skip already-added devices */
if (!dev->is_added) {
int i;
/* Fill device archdata and setup iommu table */
pcibios_setup_new_device(dev);
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;
pci_claim_resource(dev, i);
}
}
}
}
EXPORT_SYMBOL_GPL(pcibios_fixup_new_pci_devices);
static int
pcibios_pci_config_bridge(struct pci_dev *dev)
{
u8 sec_busno;
struct pci_bus *child_bus;
/* 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) {
printk (KERN_ERR "%s: could not add second bus\n", __func__);
return -EIO;
}
sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
pci_scan_child_bus(child_bus);
/* Fixup new pci devices */
pcibios_fixup_new_pci_devices(child_bus);
/* Make the discovered devices available */
pci_bus_add_devices(child_bus);
eeh_add_device_tree_late(child_bus);
return 0;
}
/**
* pcibios_add_pci_devices - adds new pci devices to bus
*
......@@ -147,10 +100,9 @@ pcibios_pci_config_bridge(struct pci_dev *dev)
* is how this routine differs from other, similar pcibios
* routines.)
*/
void
pcibios_add_pci_devices(struct pci_bus * bus)
void pcibios_add_pci_devices(struct pci_bus * bus)
{
int slotno, num, mode;
int slotno, num, mode, pass, max;
struct pci_dev *dev;
struct device_node *dn = pci_bus_to_OF_node(bus);
......@@ -162,26 +114,23 @@ pcibios_add_pci_devices(struct pci_bus * bus)
if (mode == PCI_PROBE_DEVTREE) {
/* use ofdt-based probe */
of_scan_bus(dn, bus);
if (!list_empty(&bus->devices)) {
pcibios_fixup_new_pci_devices(bus);
pci_bus_add_devices(bus);
eeh_add_device_tree_late(bus);
}
of_rescan_bus(dn, bus);
} else if (mode == PCI_PROBE_NORMAL) {
/* use legacy probe */
slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
if (num) {
pcibios_fixup_new_pci_devices(bus);
pci_bus_add_devices(bus);
eeh_add_device_tree_late(bus);
if (!num)
return;
pcibios_setup_bus_devices(bus);
max = bus->secondary;
for (pass=0; pass < 2; pass++)
list_for_each_entry(dev, &bus->devices, bus_list) {
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
max = pci_scan_bridge(bus, dev, max, pass);
}
list_for_each_entry(dev, &bus->devices, bus_list)
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
pcibios_pci_config_bridge(dev);
}
pcibios_finish_adding_to_bus(bus);
}
EXPORT_SYMBOL_GPL(pcibios_add_pci_devices);
......@@ -190,6 +139,8 @@ struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
struct pci_controller *phb;
int primary;
pr_debug("PCI: Initializing new hotplug PHB %s\n", dn->full_name);
primary = list_empty(&hose_list);
phb = pcibios_alloc_controller(dn);
if (!phb)
......@@ -203,11 +154,59 @@ struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
eeh_add_device_tree_early(dn);
scan_phb(phb);
pcibios_allocate_bus_resources(phb->bus);
pcibios_fixup_new_pci_devices(phb->bus);
pci_bus_add_devices(phb->bus);
eeh_add_device_tree_late(phb->bus);
pcibios_finish_adding_to_bus(phb->bus);
return phb;
}
EXPORT_SYMBOL_GPL(init_phb_dynamic);
/* RPA-specific bits for removing PHBs */
int remove_phb_dynamic(struct pci_controller *phb)
{
struct pci_bus *b = phb->bus;
struct resource *res;
int rc, i;
pr_debug("PCI: Removing PHB %04x:%02x... \n",
pci_domain_nr(b), b->number);
/* We cannot to remove a root bus that has children */
if (!(list_empty(&b->children) && list_empty(&b->devices)))
return -EBUSY;
/* We -know- there aren't any child devices anymore at this stage
* and thus, we can safely unmap the IO space as it's not in use
*/
res = &phb->io_resource;
if (res->flags & IORESOURCE_IO) {
rc = pcibios_unmap_io_space(b);
if (rc) {
printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
__func__, b->name);
return 1;
}
}
/* Unregister the bridge device from sysfs and remove the PCI bus */
device_unregister(b->bridge);
phb->bus = NULL;
pci_remove_bus(b);
/* Now release the IO resource */
if (res->flags & IORESOURCE_IO)
release_resource(res);
/* Release memory resources */
for (i = 0; i < 3; ++i) {
res = &phb->mem_resources[i];
if (!(res->flags & IORESOURCE_MEM))
continue;
release_resource(res);
}
/* Free pci_controller data structure */
pcibios_free_controller(phb);
return 0;
}
EXPORT_SYMBOL_GPL(remove_phb_dynamic);
......@@ -14,6 +14,9 @@
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#undef DEBUG
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/string.h>
......@@ -151,20 +154,20 @@ static void dlpar_pci_add_bus(struct device_node *dn)
return;
}
/* Scan below the new bridge */
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);
/* 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);
/* Finish adding it : resource allocation, adding devices, etc...
* Note that we need to perform the finish pass on the -parent-
* bus of the EADS bridge so the bridge device itself gets
* properly added
*/
pcibios_finish_adding_to_bus(phb->bus);
}
static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
......@@ -203,27 +206,6 @@ static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
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;
......@@ -235,18 +217,15 @@ static int dlpar_remove_phb(char *drc_name, struct device_node *dn)
/* 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",
__func__, drc_name);
return -EIO;
}
if (slot && rpaphp_deregister_slot(slot)) {
printk(KERN_ERR "%s: unable to remove hotplug slot %s\n",
__func__, drc_name);
return -EIO;
}
pdn = dn->data;
BUG_ON(!pdn || !pdn->phb);
rc = dlpar_remove_root_bus(pdn->phb);
rc = remove_phb_dynamic(pdn->phb);
if (rc < 0)
return rc;
......@@ -378,26 +357,38 @@ int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
if (!bus)
return -EINVAL;
/* If pci slot is hotplugable, use hotplug to remove it */
pr_debug("PCI: Removing PCI slot below EADS bridge %s\n",
bus->self ? pci_name(bus->self) : "<!PHB!>");
slot = find_php_slot(dn);
if (slot) {
pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n",
pci_domain_nr(bus), bus->number);
if (rpaphp_deregister_slot(slot)) {
printk(KERN_ERR
"%s: unable to remove hotplug slot %s\n",
__func__, drc_name);
return -EIO;
}
} else
pcibios_remove_pci_devices(bus);
}
/* Remove all devices below slot */
pcibios_remove_pci_devices(bus);
/* Unmap PCI IO space */
if (pcibios_unmap_io_space(bus)) {
printk(KERN_ERR "%s: failed to unmap bus range\n",
__func__);
return -ERANGE;
}
/* Remove the EADS bridge device itself */
BUG_ON(!bus->self);
pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self));
eeh_remove_bus_device(bus->self);
pci_remove_bus_device(bus->self);
return 0;
}
......
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