diff options
Diffstat (limited to 'drivers/pci/hotplug/pnv_php.c')
| -rw-r--r-- | drivers/pci/hotplug/pnv_php.c | 96 |
1 files changed, 77 insertions, 19 deletions
diff --git a/drivers/pci/hotplug/pnv_php.c b/drivers/pci/hotplug/pnv_php.c index 573a41869c15..1304329ca6f7 100644 --- a/drivers/pci/hotplug/pnv_php.c +++ b/drivers/pci/hotplug/pnv_php.c @@ -3,6 +3,7 @@ * PCI Hotplug Driver for PowerPC PowerNV platform. * * Copyright Gavin Shan, IBM Corporation 2016. + * Copyright (C) 2025 Raptor Engineering, LLC */ #include <linux/bitfield.h> @@ -36,8 +37,10 @@ static void pnv_php_register(struct device_node *dn); static void pnv_php_unregister_one(struct device_node *dn); static void pnv_php_unregister(struct device_node *dn); +static void pnv_php_enable_irq(struct pnv_php_slot *php_slot); + static void pnv_php_disable_irq(struct pnv_php_slot *php_slot, - bool disable_device) + bool disable_device, bool disable_msi) { struct pci_dev *pdev = php_slot->pdev; u16 ctrl; @@ -53,19 +56,15 @@ static void pnv_php_disable_irq(struct pnv_php_slot *php_slot, php_slot->irq = 0; } - if (php_slot->wq) { - destroy_workqueue(php_slot->wq); - php_slot->wq = NULL; - } - - if (disable_device) { + if (disable_device || disable_msi) { if (pdev->msix_enabled) pci_disable_msix(pdev); else if (pdev->msi_enabled) pci_disable_msi(pdev); + } + if (disable_device) pci_disable_device(pdev); - } } static void pnv_php_free_slot(struct kref *kref) @@ -74,7 +73,8 @@ static void pnv_php_free_slot(struct kref *kref) struct pnv_php_slot, kref); WARN_ON(!list_empty(&php_slot->children)); - pnv_php_disable_irq(php_slot, false); + pnv_php_disable_irq(php_slot, false, false); + destroy_workqueue(php_slot->wq); kfree(php_slot->name); kfree(php_slot); } @@ -561,8 +561,58 @@ static int pnv_php_reset_slot(struct hotplug_slot *slot, bool probe) static int pnv_php_enable_slot(struct hotplug_slot *slot) { struct pnv_php_slot *php_slot = to_pnv_php_slot(slot); + u32 prop32; + int ret; + + ret = pnv_php_enable(php_slot, true); + if (ret) + return ret; + + /* (Re-)enable interrupt if the slot supports surprise hotplug */ + ret = of_property_read_u32(php_slot->dn, "ibm,slot-surprise-pluggable", + &prop32); + if (!ret && prop32) + pnv_php_enable_irq(php_slot); - return pnv_php_enable(php_slot, true); + return 0; +} + +/* + * Disable any hotplug interrupts for all slots on the provided bus, as well as + * all downstream slots in preparation for a hot unplug. + */ +static int pnv_php_disable_all_irqs(struct pci_bus *bus) +{ + struct pci_bus *child_bus; + struct pci_slot *slot; + + /* First go down child buses */ + list_for_each_entry(child_bus, &bus->children, node) + pnv_php_disable_all_irqs(child_bus); + + /* Disable IRQs for all pnv_php slots on this bus */ + list_for_each_entry(slot, &bus->slots, list) { + struct pnv_php_slot *php_slot = to_pnv_php_slot(slot->hotplug); + + pnv_php_disable_irq(php_slot, false, true); + } + + return 0; +} + +/* + * Disable any hotplug interrupts for all downstream slots on the provided + * bus in preparation for a hot unplug. + */ +static int pnv_php_disable_all_downstream_irqs(struct pci_bus *bus) +{ + struct pci_bus *child_bus; + + /* Go down child buses, recursively deactivating their IRQs */ + list_for_each_entry(child_bus, &bus->children, node) + pnv_php_disable_all_irqs(child_bus); + + return 0; } static int pnv_php_disable_slot(struct hotplug_slot *slot) @@ -579,6 +629,13 @@ static int pnv_php_disable_slot(struct hotplug_slot *slot) php_slot->state != PNV_PHP_STATE_REGISTERED) return 0; + /* + * Free all IRQ resources from all child slots before remove. + * Note that we do not disable the root slot IRQ here as that + * would also deactivate the slot hot (re)plug interrupt! + */ + pnv_php_disable_all_downstream_irqs(php_slot->bus); + /* Remove all devices behind the slot */ pci_lock_rescan_remove(); pci_hp_remove_devices(php_slot->bus); @@ -647,6 +704,15 @@ static struct pnv_php_slot *pnv_php_alloc_slot(struct device_node *dn) return NULL; } + /* Allocate workqueue for this slot's interrupt handling */ + php_slot->wq = alloc_workqueue("pciehp-%s", 0, 0, php_slot->name); + if (!php_slot->wq) { + SLOT_WARN(php_slot, "Cannot alloc workqueue\n"); + kfree(php_slot->name); + kfree(php_slot); + return NULL; + } + if (dn->child && PCI_DN(dn->child)) php_slot->slot_no = PCI_SLOT(PCI_DN(dn->child)->devfn); else @@ -843,14 +909,6 @@ static void pnv_php_init_irq(struct pnv_php_slot *php_slot, int irq) u16 sts, ctrl; int ret; - /* Allocate workqueue */ - php_slot->wq = alloc_workqueue("pciehp-%s", 0, 0, php_slot->name); - if (!php_slot->wq) { - SLOT_WARN(php_slot, "Cannot alloc workqueue\n"); - pnv_php_disable_irq(php_slot, true); - return; - } - /* Check PDC (Presence Detection Change) is broken or not */ ret = of_property_read_u32(php_slot->dn, "ibm,slot-broken-pdc", &broken_pdc); @@ -869,7 +927,7 @@ static void pnv_php_init_irq(struct pnv_php_slot *php_slot, int irq) ret = request_irq(irq, pnv_php_interrupt, IRQF_SHARED, php_slot->name, php_slot); if (ret) { - pnv_php_disable_irq(php_slot, true); + pnv_php_disable_irq(php_slot, true, true); SLOT_WARN(php_slot, "Error %d enabling IRQ %d\n", ret, irq); return; } |