Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 175 insertions, 0 deletions

diff --git a/arch/s390/pci/pci_event.c b/arch/s390/pci/pci_event.c
new file mode 100644
index 000000000..6ced44b5b
--- /dev/null
+++ b/arch/s390/pci/pci_event.c
@@ -0,0 +1,175 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  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>
+
+#include "pci_bus.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);
+	struct pci_dev *pdev = NULL;
+
+	zpci_err("error CCDF:\n");
+	zpci_err_hex(ccdf, sizeof(*ccdf));
+
+	if (zdev)
+		pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
+
+	pr_err("%s: Event 0x%x reports an error for PCI function 0x%x\n",
+	       pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid);
+
+	if (!pdev)
+		goto no_pdev;
+
+	pdev->error_state = pci_channel_io_perm_failure;
+	pci_dev_put(pdev);
+no_pdev:
+	zpci_zdev_put(zdev);
+}
+
+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);
+	bool existing_zdev = !!zdev;
+	enum zpci_state state;
+	struct pci_dev *pdev;
+	int ret;
+
+	zpci_err("avail CCDF:\n");
+	zpci_err_hex(ccdf, sizeof(*ccdf));
+
+	switch (ccdf->pec) {
+	case 0x0301: /* Reserved|Standby -> Configured */
+		if (!zdev) {
+			zpci_create_device(ccdf->fid, ccdf->fh, ZPCI_FN_STATE_CONFIGURED);
+			break;
+		}
+		/* the configuration request may be stale */
+		if (zdev->state != ZPCI_FN_STATE_STANDBY)
+			break;
+		zdev->fh = ccdf->fh;
+		zdev->state = ZPCI_FN_STATE_CONFIGURED;
+		ret = zpci_enable_device(zdev);
+		if (ret)
+			break;
+
+		/* the PCI function will be scanned once function 0 appears */
+		if (!zdev->zbus->bus)
+			break;
+
+		pdev = pci_scan_single_device(zdev->zbus->bus, zdev->devfn);
+		if (!pdev)
+			break;
+
+		pci_bus_add_device(pdev);
+		pci_lock_rescan_remove();
+		pci_bus_add_devices(zdev->zbus->bus);
+		pci_unlock_rescan_remove();
+		break;
+	case 0x0302: /* Reserved -> Standby */
+		if (!zdev) {
+			zpci_create_device(ccdf->fid, ccdf->fh, ZPCI_FN_STATE_STANDBY);
+			break;
+		}
+		zdev->fh = ccdf->fh;
+		break;
+	case 0x0303: /* Deconfiguration requested */
+		if (!zdev)
+			break;
+		zpci_remove_device(zdev, false);
+
+		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|Reserved */
+		if (!zdev)
+			break;
+		/* Give the driver a hint that the function is
+		 * already unusable.
+		 */
+		zpci_remove_device(zdev, true);
+
+		zdev->fh = ccdf->fh;
+		zpci_disable_device(zdev);
+		zdev->state = ZPCI_FN_STATE_STANDBY;
+		if (!clp_get_state(ccdf->fid, &state) &&
+		    state == ZPCI_FN_STATE_RESERVED) {
+			zpci_device_reserved(zdev);
+		}
+		break;
+	case 0x0306: /* 0x308 or 0x302 for multiple devices */
+		zpci_remove_reserved_devices();
+		clp_scan_pci_devices();
+		break;
+	case 0x0308: /* Standby -> Reserved */
+		if (!zdev)
+			break;
+		zpci_device_reserved(zdev);
+		break;
+	default:
+		break;
+	}
+	if (existing_zdev)
+		zpci_zdev_put(zdev);
+}
+
+void zpci_event_availability(void *data)
+{
+	if (zpci_is_enabled())
+		__zpci_event_availability(data);
+}