[PATCH v3 5/6] PCI/powerpc/eeh: Add pcibios hooks for preparing to rescan

[Sergey Miroshnichenko <s.miroshnichenko@yadro.com>]

Reading an empty slot returns all ones, which triggers a false
EEH error event on PowerNV.

New callbacks pcibios_rescan_prepare/done are introduced to
pause/resume the EEH during rescan.

In the same time it makes possible to miss a real EEH event during
rescan.

Signed-off-by: Sergey Miroshnichenko <s.miroshnichenko@yadro.com>
---
 arch/powerpc/include/asm/eeh.h               |  2 ++
 arch/powerpc/kernel/eeh.c                    | 12 +++++++++++
 arch/powerpc/platforms/powernv/eeh-powernv.c | 22 ++++++++++++++++++++
 drivers/pci/probe.c                          | 14 +++++++++++++
 include/linux/pci.h                          |  2 ++
 5 files changed, 52 insertions(+)

diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h
index 219637ea69a1..63c8e8fa671f 100644
--- a/arch/powerpc/include/asm/eeh.h
+++ b/arch/powerpc/include/asm/eeh.h
@@ -219,6 +219,8 @@ struct eeh_ops {
 	int (*next_error)(struct eeh_pe **pe);
 	int (*restore_config)(struct pci_dn *pdn);
 	int (*notify_resume)(struct pci_dn *pdn);
+	int (*rescan_prepare)(struct pci_bus *bus);
+	int (*rescan_done)(struct pci_bus *bus);
 };
 
 extern int eeh_subsystem_flags;
diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c
index 6ebba3e48b01..d55f1089ca7b 100644
--- a/arch/powerpc/kernel/eeh.c
+++ b/arch/powerpc/kernel/eeh.c
@@ -1831,3 +1831,15 @@ static int __init eeh_init_proc(void)
 	return 0;
 }
 __initcall(eeh_init_proc);
+
+void pcibios_rescan_prepare(struct pci_bus *bus)
+{
+	if (eeh_ops && eeh_ops->rescan_prepare)
+		eeh_ops->rescan_prepare(bus);
+}
+
+void pcibios_rescan_done(struct pci_bus *bus)
+{
+	if (eeh_ops && eeh_ops->rescan_done)
+		eeh_ops->rescan_done(bus);
+}
diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c b/arch/powerpc/platforms/powernv/eeh-powernv.c
index 3c1beae29f2d..44c74aa89fb4 100644
--- a/arch/powerpc/platforms/powernv/eeh-powernv.c
+++ b/arch/powerpc/platforms/powernv/eeh-powernv.c
@@ -59,6 +59,26 @@ void pnv_pcibios_bus_add_device(struct pci_dev *pdev)
 	eeh_sysfs_add_device(pdev);
 }
 
+static int pnv_eeh_rescan_prepare(struct pci_bus *bus)
+{
+	struct pci_controller *hose = pci_bus_to_host(bus);
+	struct pnv_phb *phb = hose->private_data;
+
+	phb->flags &= ~PNV_PHB_FLAG_EEH;
+	disable_irq(eeh_event_irq);
+	return 0;
+}
+
+static int pnv_eeh_rescan_done(struct pci_bus *bus)
+{
+	struct pci_controller *hose = pci_bus_to_host(bus);
+	struct pnv_phb *phb = hose->private_data;
+
+	enable_irq(eeh_event_irq);
+	phb->flags |= PNV_PHB_FLAG_EEH;
+	return 0;
+}
+
 static int pnv_eeh_init(void)
 {
 	struct pci_controller *hose;
@@ -1710,6 +1730,8 @@ static struct eeh_ops pnv_eeh_ops = {
 	.write_config           = pnv_eeh_write_config,
 	.next_error		= pnv_eeh_next_error,
 	.restore_config		= pnv_eeh_restore_config,
+	.rescan_prepare		= pnv_eeh_rescan_prepare,
+	.rescan_done		= pnv_eeh_rescan_done,
 	.notify_resume		= NULL
 };
 
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index ac876e32de4b..4a9045364809 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2801,6 +2801,14 @@ void __weak pcibios_remove_bus(struct pci_bus *bus)
 {
 }
 
+void __weak pcibios_rescan_prepare(struct pci_bus *bus)
+{
+}
+
+void __weak pcibios_rescan_done(struct pci_bus *bus)
+{
+}
+
 struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
 		struct pci_ops *ops, void *sysdata, struct list_head *resources)
 {
@@ -3055,9 +3063,15 @@ unsigned int pci_rescan_bus_bridge_resize(struct pci_dev *bridge)
 unsigned int pci_rescan_bus(struct pci_bus *bus)
 {
 	unsigned int max;
+	struct pci_bus *root = bus;
+
+	while (!pci_is_root_bus(root))
+		root = root->parent;
 
+	pcibios_rescan_prepare(root);
 	max = pci_scan_child_bus(bus);
 	pci_assign_unassigned_bus_resources(bus);
+	pcibios_rescan_done(root);
 	pci_bus_add_devices(bus);
 
 	return max;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 340029b2fb38..42930731c5a7 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1929,6 +1929,8 @@ void pcibios_penalize_isa_irq(int irq, int active);
 int pcibios_alloc_irq(struct pci_dev *dev);
 void pcibios_free_irq(struct pci_dev *dev);
 resource_size_t pcibios_default_alignment(void);
+void pcibios_rescan_prepare(struct pci_bus *bus);
+void pcibios_rescan_done(struct pci_bus *bus);
 
 #ifdef CONFIG_HIBERNATE_CALLBACKS
 extern struct dev_pm_ops pcibios_pm_ops;
-- 
2.17.1