s390/pci: CHSC PCI support for error and availability events

Add CHSC store-event-information support for PCI (notfication type 2)
and report error and availability events to the PCI architecture layer.

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

2 files changed, 95 insertions, 1 deletions

diff --git a/arch/s390/pci/Makefile b/arch/s390/pci/Makefile
index 4590596d8b25..7e36f42ba086 100644
--- a/arch/s390/pci/Makefile
+++ b/arch/s390/pci/Makefile
@@ -2,4 +2,5 @@
 # Makefile for the s390 PCI subsystem.
 #
 
-obj-$(CONFIG_PCI)       += pci.o pci_dma.o pci_clp.o pci_msi.o
+obj-$(CONFIG_PCI)       += pci.o pci_dma.o pci_clp.o pci_msi.o \
+                           pci_event.o
diff --git a/arch/s390/pci/pci_event.c b/arch/s390/pci/pci_event.c
new file mode 100644
index 000000000000..dbed8cd3370c
--- /dev/null
+++ b/arch/s390/pci/pci_event.c
@@ -0,0 +1,93 @@
+/*
+ *  Copyright IBM Corp. 2012
+ *
+ *  Author(s):
+ *    Jan Glauber <jang@linux.vnet.ibm.com>
+ */
+
+#define COMPONENT "zPCI"
+#define pr_fmt(fmt) COMPONENT ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+
+/* Content Code Description for PCI Function Error */
+struct zpci_ccdf_err {
+        u32 reserved1;
+        u32 fh;                         /* function handle */
+        u32 fid;                        /* function id */
+        u32 ett         :  4;           /* expected table type */
+        u32 mvn         : 12;           /* MSI vector number */
+        u32 dmaas       :  8;           /* DMA address space */
+        u32             :  6;
+        u32 q           :  1;           /* event qualifier */
+        u32 rw          :  1;           /* read/write */
+        u64 faddr;                      /* failing address */
+        u32 reserved3;
+        u16 reserved4;
+        u16 pec;                        /* PCI event code */
+} __packed;
+
+/* Content Code Description for PCI Function Availability */
+struct zpci_ccdf_avail {
+        u32 reserved1;
+        u32 fh;                         /* function handle */
+        u32 fid;                        /* function id */
+        u32 reserved2;
+        u32 reserved3;
+        u32 reserved4;
+        u32 reserved5;
+        u16 reserved6;
+        u16 pec;                        /* PCI event code */
+} __packed;
+
+static void zpci_event_log_err(struct zpci_ccdf_err *ccdf)
+{
+        struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
+
+        dev_err(&zdev->pdev->dev, "event code: 0x%x\n", ccdf->pec);
+}
+
+static void zpci_event_log_avail(struct zpci_ccdf_avail *ccdf)
+{
+        struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
+
+        pr_err("%s%s: availability event: fh: 0x%x  fid: 0x%x  event code: 0x%x  reason:",
+                (zdev) ? dev_driver_string(&zdev->pdev->dev) : "?",
+                (zdev) ? dev_name(&zdev->pdev->dev) : "?",
+                ccdf->fh, ccdf->fid, ccdf->pec);
+        print_hex_dump(KERN_CONT, "ccdf", DUMP_PREFIX_OFFSET,
+                       16, 1, ccdf, sizeof(*ccdf), false);
+
+        switch (ccdf->pec) {
+        case 0x0301:
+                zpci_enable_device(zdev);
+                break;
+        case 0x0302:
+                clp_add_pci_device(ccdf->fid, ccdf->fh, 0);
+                break;
+        case 0x0306:
+                clp_find_pci_devices();
+                break;
+        default:
+                break;
+        }
+}
+
+void zpci_event_error(void *data)
+{
+        struct zpci_ccdf_err *ccdf = data;
+        struct zpci_dev *zdev;
+
+        zpci_event_log_err(ccdf);
+        zdev = get_zdev_by_fid(ccdf->fid);
+        if (!zdev) {
+                pr_err("Error event for unknown fid: %x", ccdf->fid);
+                return;
+        }
+}
+
+void zpci_event_availability(void *data)
+{
+        zpci_event_log_avail(data);
+}