Adding upstream version 4.19.249.upstream/4.19.249

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

1 files changed, 223 insertions, 0 deletions

diff --git a/drivers/s390/cio/device_id.c b/drivers/s390/cio/device_id.c
new file mode 100644
index 000000000..f6df83a9d
--- /dev/null
+++ b/drivers/s390/cio/device_id.c
@@ -0,0 +1,223 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  CCW device SENSE ID I/O handling.
+ *
+ *    Copyright IBM Corp. 2002, 2009
+ *    Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
+ *		 Martin Schwidefsky <schwidefsky@de.ibm.com>
+ *		 Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <asm/ccwdev.h>
+#include <asm/setup.h>
+#include <asm/cio.h>
+#include <asm/diag.h>
+
+#include "cio.h"
+#include "cio_debug.h"
+#include "device.h"
+#include "io_sch.h"
+
+#define SENSE_ID_RETRIES	256
+#define SENSE_ID_TIMEOUT	(10 * HZ)
+#define SENSE_ID_MIN_LEN	4
+#define SENSE_ID_BASIC_LEN	7
+
+/**
+ * diag210_to_senseid - convert diag 0x210 data to sense id information
+ * @senseid: sense id
+ * @diag: diag 0x210 data
+ *
+ * Return 0 on success, non-zero otherwise.
+ */
+static int diag210_to_senseid(struct senseid *senseid, struct diag210 *diag)
+{
+	static struct {
+		int class, type, cu_type;
+	} vm_devices[] = {
+		{ 0x08, 0x01, 0x3480 },
+		{ 0x08, 0x02, 0x3430 },
+		{ 0x08, 0x10, 0x3420 },
+		{ 0x08, 0x42, 0x3424 },
+		{ 0x08, 0x44, 0x9348 },
+		{ 0x08, 0x81, 0x3490 },
+		{ 0x08, 0x82, 0x3422 },
+		{ 0x10, 0x41, 0x1403 },
+		{ 0x10, 0x42, 0x3211 },
+		{ 0x10, 0x43, 0x3203 },
+		{ 0x10, 0x45, 0x3800 },
+		{ 0x10, 0x47, 0x3262 },
+		{ 0x10, 0x48, 0x3820 },
+		{ 0x10, 0x49, 0x3800 },
+		{ 0x10, 0x4a, 0x4245 },
+		{ 0x10, 0x4b, 0x4248 },
+		{ 0x10, 0x4d, 0x3800 },
+		{ 0x10, 0x4e, 0x3820 },
+		{ 0x10, 0x4f, 0x3820 },
+		{ 0x10, 0x82, 0x2540 },
+		{ 0x10, 0x84, 0x3525 },
+		{ 0x20, 0x81, 0x2501 },
+		{ 0x20, 0x82, 0x2540 },
+		{ 0x20, 0x84, 0x3505 },
+		{ 0x40, 0x01, 0x3278 },
+		{ 0x40, 0x04, 0x3277 },
+		{ 0x40, 0x80, 0x2250 },
+		{ 0x40, 0xc0, 0x5080 },
+		{ 0x80, 0x00, 0x3215 },
+	};
+	int i;
+
+	/* Special case for osa devices. */
+	if (diag->vrdcvcla == 0x02 && diag->vrdcvtyp == 0x20) {
+		senseid->cu_type = 0x3088;
+		senseid->cu_model = 0x60;
+		senseid->reserved = 0xff;
+		return 0;
+	}
+	for (i = 0; i < ARRAY_SIZE(vm_devices); i++) {
+		if (diag->vrdcvcla == vm_devices[i].class &&
+		    diag->vrdcvtyp == vm_devices[i].type) {
+			senseid->cu_type = vm_devices[i].cu_type;
+			senseid->reserved = 0xff;
+			return 0;
+		}
+	}
+
+	return -ENODEV;
+}
+
+/**
+ * diag_get_dev_info - retrieve device information via diag 0x210
+ * @cdev: ccw device
+ *
+ * Returns zero on success, non-zero otherwise.
+ */
+static int diag210_get_dev_info(struct ccw_device *cdev)
+{
+	struct ccw_dev_id *dev_id = &cdev->private->dev_id;
+	struct senseid *senseid = &cdev->private->senseid;
+	struct diag210 diag_data;
+	int rc;
+
+	if (dev_id->ssid != 0)
+		return -ENODEV;
+	memset(&diag_data, 0, sizeof(diag_data));
+	diag_data.vrdcdvno	= dev_id->devno;
+	diag_data.vrdclen	= sizeof(diag_data);
+	rc = diag210(&diag_data);
+	CIO_TRACE_EVENT(4, "diag210");
+	CIO_HEX_EVENT(4, &rc, sizeof(rc));
+	CIO_HEX_EVENT(4, &diag_data, sizeof(diag_data));
+	if (rc != 0 && rc != 2)
+		goto err_failed;
+	if (diag210_to_senseid(senseid, &diag_data))
+		goto err_unknown;
+	return 0;
+
+err_unknown:
+	CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: unknown diag210 data\n",
+		      dev_id->ssid, dev_id->devno);
+	return -ENODEV;
+err_failed:
+	CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: diag210 failed (rc=%d)\n",
+		      dev_id->ssid, dev_id->devno, rc);
+	return -ENODEV;
+}
+
+/*
+ * Initialize SENSE ID data.
+ */
+static void snsid_init(struct ccw_device *cdev)
+{
+	cdev->private->flags.esid = 0;
+	memset(&cdev->private->senseid, 0, sizeof(cdev->private->senseid));
+	cdev->private->senseid.cu_type = 0xffff;
+}
+
+/*
+ * Check for complete SENSE ID data.
+ */
+static int snsid_check(struct ccw_device *cdev, void *data)
+{
+	struct cmd_scsw *scsw = &cdev->private->irb.scsw.cmd;
+	int len = sizeof(struct senseid) - scsw->count;
+
+	/* Check for incomplete SENSE ID data. */
+	if (len < SENSE_ID_MIN_LEN)
+		goto out_restart;
+	if (cdev->private->senseid.cu_type == 0xffff)
+		goto out_restart;
+	/* Check for incompatible SENSE ID data. */
+	if (cdev->private->senseid.reserved != 0xff)
+		return -EOPNOTSUPP;
+	/* Check for extended-identification information. */
+	if (len > SENSE_ID_BASIC_LEN)
+		cdev->private->flags.esid = 1;
+	return 0;
+
+out_restart:
+	snsid_init(cdev);
+	return -EAGAIN;
+}
+
+/*
+ * Process SENSE ID request result.
+ */
+static void snsid_callback(struct ccw_device *cdev, void *data, int rc)
+{
+	struct ccw_dev_id *id = &cdev->private->dev_id;
+	struct senseid *senseid = &cdev->private->senseid;
+	int vm = 0;
+
+	if (rc && MACHINE_IS_VM) {
+		/* Try diag 0x210 fallback on z/VM. */
+		snsid_init(cdev);
+		if (diag210_get_dev_info(cdev) == 0) {
+			rc = 0;
+			vm = 1;
+		}
+	}
+	CIO_MSG_EVENT(2, "snsid: device 0.%x.%04x: rc=%d %04x/%02x "
+		      "%04x/%02x%s\n", id->ssid, id->devno, rc,
+		      senseid->cu_type, senseid->cu_model, senseid->dev_type,
+		      senseid->dev_model, vm ? " (diag210)" : "");
+	ccw_device_sense_id_done(cdev, rc);
+}
+
+/**
+ * ccw_device_sense_id_start - perform SENSE ID
+ * @cdev: ccw device
+ *
+ * Execute a SENSE ID channel program on @cdev to update its sense id
+ * information. When finished, call ccw_device_sense_id_done with a
+ * return code specifying the result.
+ */
+void ccw_device_sense_id_start(struct ccw_device *cdev)
+{
+	struct subchannel *sch = to_subchannel(cdev->dev.parent);
+	struct ccw_request *req = &cdev->private->req;
+	struct ccw1 *cp = cdev->private->iccws;
+
+	CIO_TRACE_EVENT(4, "snsid");
+	CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
+	/* Data setup. */
+	snsid_init(cdev);
+	/* Channel program setup. */
+	cp->cmd_code	= CCW_CMD_SENSE_ID;
+	cp->cda		= (u32) (addr_t) &cdev->private->senseid;
+	cp->count	= sizeof(struct senseid);
+	cp->flags	= CCW_FLAG_SLI;
+	/* Request setup. */
+	memset(req, 0, sizeof(*req));
+	req->cp		= cp;
+	req->timeout	= SENSE_ID_TIMEOUT;
+	req->maxretries	= SENSE_ID_RETRIES;
+	req->lpm	= sch->schib.pmcw.pam & sch->opm;
+	req->check	= snsid_check;
+	req->callback	= snsid_callback;
+	ccw_request_start(cdev);
+}