s390/pci: add zpci_report_error interface

The 'report_error' interface for PCI devices found on s390 can be
used by a user space program to inject an adapter error notification.
Add a new kernel interface zpci_report_error to allow a PCI device
driver to inject these error notifications without a detour over
user space.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/include/asm/pci.h

@@ -11,6 +11,7 @@
 #include <asm-generic/pci.h>
 #include <asm/pci_clp.h>
 #include <asm/pci_debug.h>
+#include <asm/sclp.h>
 
 #define PCIBIOS_MIN_IO		0x1000
 #define PCIBIOS_MIN_MEM		0x10000000
@@ -216,6 +217,9 @@ void zpci_debug_init_device(struct zpci_dev *, const char *);
 void zpci_debug_exit_device(struct zpci_dev *);
 void zpci_debug_info(struct zpci_dev *, struct seq_file *);
 
+/* Error reporting */
+int zpci_report_error(struct pci_dev *, struct zpci_report_error_header *);
+
 #ifdef CONFIG_NUMA
 
 /* Returns the node based on PCI bus */

arch/s390/pci/pci.c

@@ -854,6 +854,15 @@ void zpci_stop_device(struct zpci_dev *zdev)
 }
 EXPORT_SYMBOL_GPL(zpci_stop_device);
 
+int zpci_report_error(struct pci_dev *pdev,
+		      struct zpci_report_error_header *report)
+{
+	struct zpci_dev *zdev = to_zpci(pdev);
+
+	return sclp_pci_report(report, zdev->fh, zdev->fid);
+}
+EXPORT_SYMBOL(zpci_report_error);
+
 static inline int barsize(u8 size)
 {
 	return (size) ? (1 << size) >> 10 : 0;