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>
diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
index d3597dc..48ce434 100644
--- a/arch/s390/include/asm/pci.h
+++ b/arch/s390/include/asm/pci.h
@@ -95,6 +95,11 @@
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 @@
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 e62a555..8337886 100644
--- a/arch/s390/include/asm/sclp.h
+++ b/arch/s390/include/asm/sclp.h
@@ -55,5 +55,7 @@
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 */
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index 5a2ef9e..c523594 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -47,7 +47,12 @@
/* list of all detected zpci devices */
LIST_HEAD(zpci_list);
+EXPORT_SYMBOL_GPL(zpci_list);
DEFINE_MUTEX(zpci_list_lock);
+EXPORT_SYMBOL_GPL(zpci_list_lock);
+
+struct pci_hp_callback_ops hotplug_ops;
+EXPORT_SYMBOL_GPL(hotplug_ops);
static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
static DEFINE_SPINLOCK(zpci_domain_lock);
@@ -935,6 +940,8 @@
mutex_lock(&zpci_list_lock);
list_add_tail(&zdev->entry, &zpci_list);
+ if (hotplug_ops.create_slot)
+ hotplug_ops.create_slot(zdev);
mutex_unlock(&zpci_list_lock);
if (zdev->state == ZPCI_FN_STATE_STANDBY)
@@ -948,6 +955,8 @@
out_start:
mutex_lock(&zpci_list_lock);
list_del(&zdev->entry);
+ if (hotplug_ops.remove_slot)
+ hotplug_ops.remove_slot(zdev);
mutex_unlock(&zpci_list_lock);
out_bus:
zpci_free_domain(zdev);