s390/pci: PCI hotplug support via SCLP

Add SCLP PCI configure/deconfigure and implement a PCI hotplug
controller (s390_pci_hpc). The hotplug controller creates a slot
for every PCI function in stand-by or configured state. The PCI
functions are named after the PCI function ID (fid). By writing to
the power attribute in /sys/bus/pci/slots/<fid>/power the PCI function
is moved to stand-by or configured state. If moved to the configured
state the device is automatically scanned by the s390 PCI layer.

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

2 files changed, 13 insertions, 0 deletions

diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
index d3597dcfec3..48ce434d6fd 100644
--- a/arch/s390/include/asm/pci.h
+++ b/arch/s390/include/asm/pci.h
@@ -95,6 +95,11 @@ struct zpci_dev {
         enum pci_bus_speed max_bus_speed;
 };
 
+struct pci_hp_callback_ops {
+        int (*create_slot)      (struct zpci_dev *zdev);
+        void (*remove_slot)     (struct zpci_dev *zdev);
+};
+
 static inline bool zdev_enabled(struct zpci_dev *zdev)
 {
         return (zdev->fh & (1UL << 31)) ? true : false;
@@ -140,4 +145,10 @@ bool zpci_fid_present(u32);
 int zpci_dma_init(void);
 void zpci_dma_exit(void);
 
+/* Hotplug */
+extern struct mutex zpci_list_lock;
+extern struct list_head zpci_list;
+extern struct pci_hp_callback_ops hotplug_ops;
+extern unsigned int pci_probe;
+
 #endif
diff --git a/arch/s390/include/asm/sclp.h b/arch/s390/include/asm/sclp.h
index e62a555557e..833788693f0 100644
--- a/arch/s390/include/asm/sclp.h
+++ b/arch/s390/include/asm/sclp.h
@@ -55,5 +55,7 @@ int sclp_chp_read_info(struct sclp_chp_info *info);
 void sclp_get_ipl_info(struct sclp_ipl_info *info);
 bool sclp_has_linemode(void);
 bool sclp_has_vt220(void);
+int sclp_pci_configure(u32 fid);
+int sclp_pci_deconfigure(u32 fid);
 
 #endif /* _ASM_S390_SCLP_H */