mirror of https://gitee.com/openkylin/linux.git
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: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt
Paul Mackerras
parent
b5ae5f911d
commit
fd6852c8fa
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@ -241,9 +241,6 @@ extern void pcibios_remove_pci_devices(struct pci_bus *bus);
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/** Discover new pci devices under this bus, and add them */
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extern void pcibios_add_pci_devices(struct pci_bus *bus);
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extern void pcibios_fixup_new_pci_devices(struct pci_bus *bus);
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extern int pcibios_remove_root_bus(struct pci_controller *phb);
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static inline struct pci_controller *pci_bus_to_host(const struct pci_bus *bus)
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{
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@ -204,15 +204,14 @@ static inline struct resource *pcibios_select_root(struct pci_dev *pdev,
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return root;
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}
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extern void pcibios_setup_new_device(struct pci_dev *dev);
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extern void pcibios_claim_one_bus(struct pci_bus *b);
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extern void pcibios_allocate_bus_resources(struct pci_bus *bus);
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extern void pcibios_finish_adding_to_bus(struct pci_bus *bus);
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extern void pcibios_resource_survey(void);
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extern struct pci_controller *init_phb_dynamic(struct device_node *dn);
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extern int remove_phb_dynamic(struct pci_controller *phb);
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extern struct pci_dev *of_create_pci_dev(struct device_node *node,
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struct pci_bus *bus, int devfn);
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@ -203,7 +203,7 @@ char __devinit *pcibios_setup(char *str)
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return str;
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}
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void __devinit pcibios_setup_new_device(struct pci_dev *dev)
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static void __devinit pcibios_setup_new_device(struct pci_dev *dev)
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{
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struct dev_archdata *sd = &dev->dev.archdata;
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@ -221,7 +221,6 @@ void __devinit pcibios_setup_new_device(struct pci_dev *dev)
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if (ppc_md.pci_dma_dev_setup)
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ppc_md.pci_dma_dev_setup(dev);
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}
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EXPORT_SYMBOL(pcibios_setup_new_device);
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/*
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* Reads the interrupt pin to determine if interrupt is use by card.
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@ -1397,9 +1396,10 @@ void __init pcibios_resource_survey(void)
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#ifdef CONFIG_HOTPLUG
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/* This is used by the pSeries hotplug driver to allocate resource
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/* This is used by the PCI hotplug driver to allocate resource
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* of newly plugged busses. We can try to consolidate with the
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* rest of the code later, for now, keep it as-is
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* rest of the code later, for now, keep it as-is as our main
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* resource allocation function doesn't deal with sub-trees yet.
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*/
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void __devinit pcibios_claim_one_bus(struct pci_bus *bus)
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{
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@ -1414,6 +1414,14 @@ void __devinit pcibios_claim_one_bus(struct pci_bus *bus)
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if (r->parent || !r->start || !r->flags)
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continue;
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pr_debug("PCI: Claiming %s: "
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"Resource %d: %016llx..%016llx [%x]\n",
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pci_name(dev), i,
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(unsigned long long)r->start,
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(unsigned long long)r->end,
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(unsigned int)r->flags);
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pci_claim_resource(dev, i);
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}
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}
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@ -1422,6 +1430,31 @@ void __devinit pcibios_claim_one_bus(struct pci_bus *bus)
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pcibios_claim_one_bus(child_bus);
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}
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EXPORT_SYMBOL_GPL(pcibios_claim_one_bus);
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/* pcibios_finish_adding_to_bus
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*
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* This is to be called by the hotplug code after devices have been
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* added to a bus, this include calling it for a PHB that is just
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* being added
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*/
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void pcibios_finish_adding_to_bus(struct pci_bus *bus)
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{
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pr_debug("PCI: Finishing adding to hotplug bus %04x:%02x\n",
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pci_domain_nr(bus), bus->number);
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/* Allocate bus and devices resources */
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pcibios_allocate_bus_resources(bus);
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pcibios_claim_one_bus(bus);
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/* Add new devices to global lists. Register in proc, sysfs. */
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pci_bus_add_devices(bus);
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/* Fixup EEH */
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eeh_add_device_tree_late(bus);
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}
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EXPORT_SYMBOL_GPL(pcibios_finish_adding_to_bus);
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#endif /* CONFIG_HOTPLUG */
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int pcibios_enable_device(struct pci_dev *dev, int mask)
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@ -301,51 +301,3 @@ void __init find_and_init_phbs(void)
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#endif /* CONFIG_PPC32 */
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}
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}
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/* RPA-specific bits for removing PHBs */
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int pcibios_remove_root_bus(struct pci_controller *phb)
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{
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struct pci_bus *b = phb->bus;
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struct resource *res;
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int rc, i;
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res = b->resource[0];
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if (!res->flags) {
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printk(KERN_ERR "%s: no IO resource for PHB %s\n", __func__,
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b->name);
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return 1;
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}
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rc = pcibios_unmap_io_space(b);
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if (rc) {
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printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
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__func__, b->name);
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return 1;
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}
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if (release_resource(res)) {
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printk(KERN_ERR "%s: failed to release IO on bus %s\n",
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__func__, b->name);
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return 1;
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}
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for (i = 1; i < 3; ++i) {
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res = b->resource[i];
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if (!res->flags && i == 0) {
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printk(KERN_ERR "%s: no MEM resource for PHB %s\n",
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__func__, b->name);
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return 1;
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}
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if (res->flags && release_resource(res)) {
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printk(KERN_ERR
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"%s: failed to release IO %d on bus %s\n",
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__func__, i, b->name);
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return 1;
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}
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}
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pcibios_free_controller(phb);
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return 0;
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}
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EXPORT_SYMBOL(pcibios_remove_root_bus);
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@ -25,6 +25,8 @@
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#undef DEBUG
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#include <linux/pci.h>
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#include <asm/pci-bridge.h>
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#include <asm/ppc-pci.h>
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@ -69,73 +71,24 @@ EXPORT_SYMBOL_GPL(pcibios_find_pci_bus);
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* Remove all of the PCI devices under this bus both from the
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* linux pci device tree, and from the powerpc EEH address cache.
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*/
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void
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pcibios_remove_pci_devices(struct pci_bus *bus)
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void pcibios_remove_pci_devices(struct pci_bus *bus)
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{
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struct pci_dev *dev, *tmp;
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list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
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eeh_remove_bus_device(dev);
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pci_remove_bus_device(dev);
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}
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}
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EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices);
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/* Must be called before pci_bus_add_devices */
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void
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pcibios_fixup_new_pci_devices(struct pci_bus *bus)
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{
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struct pci_dev *dev;
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list_for_each_entry(dev, &bus->devices, bus_list) {
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/* Skip already-added devices */
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if (!dev->is_added) {
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int i;
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/* Fill device archdata and setup iommu table */
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pcibios_setup_new_device(dev);
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pci_read_irq_line(dev);
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for (i = 0; i < PCI_NUM_RESOURCES; i++) {
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struct resource *r = &dev->resource[i];
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if (r->parent || !r->start || !r->flags)
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continue;
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pci_claim_resource(dev, i);
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}
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}
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}
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}
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EXPORT_SYMBOL_GPL(pcibios_fixup_new_pci_devices);
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static int
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pcibios_pci_config_bridge(struct pci_dev *dev)
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{
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u8 sec_busno;
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struct pci_dev *dev, *tmp;
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struct pci_bus *child_bus;
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/* Get busno of downstream bus */
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pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
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/* First go down child busses */
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list_for_each_entry(child_bus, &bus->children, node)
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pcibios_remove_pci_devices(child_bus);
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/* Add to children of PCI bridge dev->bus */
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child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
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if (!child_bus) {
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printk (KERN_ERR "%s: could not add second bus\n", __func__);
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return -EIO;
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}
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sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
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pci_scan_child_bus(child_bus);
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/* Fixup new pci devices */
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pcibios_fixup_new_pci_devices(child_bus);
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/* Make the discovered devices available */
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pci_bus_add_devices(child_bus);
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eeh_add_device_tree_late(child_bus);
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return 0;
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pr_debug("PCI: Removing devices on bus %04x:%02x\n",
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pci_domain_nr(bus), bus->number);
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list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
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pr_debug(" * Removing %s...\n", pci_name(dev));
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eeh_remove_bus_device(dev);
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pci_remove_bus_device(dev);
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}
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}
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EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices);
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/**
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* pcibios_add_pci_devices - adds new pci devices to bus
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@ -147,10 +100,9 @@ pcibios_pci_config_bridge(struct pci_dev *dev)
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* is how this routine differs from other, similar pcibios
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* routines.)
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*/
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void
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pcibios_add_pci_devices(struct pci_bus * bus)
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void pcibios_add_pci_devices(struct pci_bus * bus)
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{
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int slotno, num, mode;
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int slotno, num, mode, pass, max;
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struct pci_dev *dev;
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struct device_node *dn = pci_bus_to_OF_node(bus);
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@ -162,26 +114,23 @@ pcibios_add_pci_devices(struct pci_bus * bus)
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if (mode == PCI_PROBE_DEVTREE) {
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/* use ofdt-based probe */
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of_scan_bus(dn, bus);
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if (!list_empty(&bus->devices)) {
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pcibios_fixup_new_pci_devices(bus);
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pci_bus_add_devices(bus);
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eeh_add_device_tree_late(bus);
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}
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of_rescan_bus(dn, bus);
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} else if (mode == PCI_PROBE_NORMAL) {
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/* use legacy probe */
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slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
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num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
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if (num) {
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pcibios_fixup_new_pci_devices(bus);
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pci_bus_add_devices(bus);
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eeh_add_device_tree_late(bus);
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if (!num)
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return;
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pcibios_setup_bus_devices(bus);
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max = bus->secondary;
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for (pass=0; pass < 2; pass++)
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list_for_each_entry(dev, &bus->devices, bus_list) {
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if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
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dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
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max = pci_scan_bridge(bus, dev, max, pass);
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}
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list_for_each_entry(dev, &bus->devices, bus_list)
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if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
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pcibios_pci_config_bridge(dev);
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}
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pcibios_finish_adding_to_bus(bus);
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}
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EXPORT_SYMBOL_GPL(pcibios_add_pci_devices);
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@ -190,6 +139,8 @@ struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
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struct pci_controller *phb;
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int primary;
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pr_debug("PCI: Initializing new hotplug PHB %s\n", dn->full_name);
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primary = list_empty(&hose_list);
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phb = pcibios_alloc_controller(dn);
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if (!phb)
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@ -203,11 +154,59 @@ struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
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eeh_add_device_tree_early(dn);
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scan_phb(phb);
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pcibios_allocate_bus_resources(phb->bus);
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pcibios_fixup_new_pci_devices(phb->bus);
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pci_bus_add_devices(phb->bus);
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eeh_add_device_tree_late(phb->bus);
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pcibios_finish_adding_to_bus(phb->bus);
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return phb;
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}
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EXPORT_SYMBOL_GPL(init_phb_dynamic);
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/* RPA-specific bits for removing PHBs */
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int remove_phb_dynamic(struct pci_controller *phb)
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{
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struct pci_bus *b = phb->bus;
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struct resource *res;
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int rc, i;
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pr_debug("PCI: Removing PHB %04x:%02x... \n",
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pci_domain_nr(b), b->number);
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/* We cannot to remove a root bus that has children */
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if (!(list_empty(&b->children) && list_empty(&b->devices)))
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return -EBUSY;
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/* We -know- there aren't any child devices anymore at this stage
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* and thus, we can safely unmap the IO space as it's not in use
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*/
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res = &phb->io_resource;
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if (res->flags & IORESOURCE_IO) {
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rc = pcibios_unmap_io_space(b);
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if (rc) {
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printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
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__func__, b->name);
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return 1;
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}
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}
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/* Unregister the bridge device from sysfs and remove the PCI bus */
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device_unregister(b->bridge);
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phb->bus = NULL;
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pci_remove_bus(b);
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/* Now release the IO resource */
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if (res->flags & IORESOURCE_IO)
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release_resource(res);
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/* Release memory resources */
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for (i = 0; i < 3; ++i) {
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res = &phb->mem_resources[i];
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if (!(res->flags & IORESOURCE_MEM))
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continue;
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release_resource(res);
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}
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/* Free pci_controller data structure */
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pcibios_free_controller(phb);
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return 0;
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}
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EXPORT_SYMBOL_GPL(remove_phb_dynamic);
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@ -14,6 +14,9 @@
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#undef DEBUG
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/string.h>
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@ -151,20 +154,20 @@ static void dlpar_pci_add_bus(struct device_node *dn)
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return;
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}
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/* Scan below the new bridge */
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if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
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dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
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of_scan_pci_bridge(dn, dev);
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pcibios_fixup_new_pci_devices(dev->subordinate);
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/* Claim new bus resources */
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pcibios_claim_one_bus(dev->bus);
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/* Map IO space for child bus, which may or may not succeed */
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pcibios_map_io_space(dev->subordinate);
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/* Add new devices to global lists. Register in proc, sysfs. */
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pci_bus_add_devices(phb->bus);
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/* Finish adding it : resource allocation, adding devices, etc...
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* Note that we need to perform the finish pass on the -parent-
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* bus of the EADS bridge so the bridge device itself gets
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* properly added
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*/
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pcibios_finish_adding_to_bus(phb->bus);
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}
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static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
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@ -203,27 +206,6 @@ static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
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return 0;
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}
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static int dlpar_remove_root_bus(struct pci_controller *phb)
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{
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struct pci_bus *phb_bus;
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int rc;
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phb_bus = phb->bus;
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if (!(list_empty(&phb_bus->children) &&
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list_empty(&phb_bus->devices))) {
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return -EBUSY;
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}
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rc = pcibios_remove_root_bus(phb);
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if (rc)
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return -EIO;
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device_unregister(phb_bus->bridge);
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pci_remove_bus(phb_bus);
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return 0;
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}
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|
||||
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;
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue