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Diffstat (limited to 'kernel/arch/s390/pci/pci_event.c')
-rw-r--r--kernel/arch/s390/pci/pci_event.c136
1 files changed, 136 insertions, 0 deletions
diff --git a/kernel/arch/s390/pci/pci_event.c b/kernel/arch/s390/pci/pci_event.c
new file mode 100644
index 000000000..460fdb21c
--- /dev/null
+++ b/kernel/arch/s390/pci/pci_event.c
@@ -0,0 +1,136 @@
+/*
+ * Copyright IBM Corp. 2012
+ *
+ * Author(s):
+ * Jan Glauber <jang@linux.vnet.ibm.com>
+ */
+
+#define KMSG_COMPONENT "zpci"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <asm/pci_debug.h>
+#include <asm/sclp.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_error(struct zpci_ccdf_err *ccdf)
+{
+ struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
+
+ zpci_err("error CCDF:\n");
+ zpci_err_hex(ccdf, sizeof(*ccdf));
+
+ if (!zdev)
+ return;
+
+ pr_err("%s: Event 0x%x reports an error for PCI function 0x%x\n",
+ pci_name(zdev->pdev), ccdf->pec, ccdf->fid);
+}
+
+void zpci_event_error(void *data)
+{
+ if (zpci_is_enabled())
+ __zpci_event_error(data);
+}
+
+static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf)
+{
+ struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
+ struct pci_dev *pdev = zdev ? zdev->pdev : NULL;
+ int ret;
+
+ pr_info("%s: Event 0x%x reconfigured PCI function 0x%x\n",
+ pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid);
+ zpci_err("avail CCDF:\n");
+ zpci_err_hex(ccdf, sizeof(*ccdf));
+
+ switch (ccdf->pec) {
+ case 0x0301: /* Standby -> Configured */
+ if (!zdev || zdev->state != ZPCI_FN_STATE_STANDBY)
+ break;
+ zdev->state = ZPCI_FN_STATE_CONFIGURED;
+ zdev->fh = ccdf->fh;
+ ret = zpci_enable_device(zdev);
+ if (ret)
+ break;
+ pci_rescan_bus(zdev->bus);
+ break;
+ case 0x0302: /* Reserved -> Standby */
+ if (!zdev)
+ clp_add_pci_device(ccdf->fid, ccdf->fh, 0);
+ break;
+ case 0x0303: /* Deconfiguration requested */
+ if (pdev)
+ pci_stop_and_remove_bus_device(pdev);
+
+ ret = zpci_disable_device(zdev);
+ if (ret)
+ break;
+
+ ret = sclp_pci_deconfigure(zdev->fid);
+ zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
+ if (!ret)
+ zdev->state = ZPCI_FN_STATE_STANDBY;
+
+ break;
+ case 0x0304: /* Configured -> Standby */
+ if (pdev) {
+ /* Give the driver a hint that the function is
+ * already unusable. */
+ pdev->error_state = pci_channel_io_perm_failure;
+ pci_stop_and_remove_bus_device(pdev);
+ }
+
+ zdev->fh = ccdf->fh;
+ zpci_disable_device(zdev);
+ zdev->state = ZPCI_FN_STATE_STANDBY;
+ break;
+ case 0x0306: /* 0x308 or 0x302 for multiple devices */
+ clp_rescan_pci_devices();
+ break;
+ case 0x0308: /* Standby -> Reserved */
+ if (!zdev)
+ break;
+ pci_stop_root_bus(zdev->bus);
+ pci_remove_root_bus(zdev->bus);
+ break;
+ default:
+ break;
+ }
+}
+
+void zpci_event_availability(void *data)
+{
+ if (zpci_is_enabled())
+ __zpci_event_availability(data);
+}