Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 updates from Martin Schwidefsky:
"common I/O layer
- Fix bit-fields crossing storage-unit boundaries in css_general_char

dasd driver
- Avoid a sparse warning in regard to the queue lock
- Allocate the struct dasd_ccw_req as per request data. Only for
internal I/O is the structure allocated separately
- Remove the unused function dasd_kmalloc_set_cda
- Save a few bytes in struct dasd_ccw_req by reordering fields
- Convert remaining users of dasd_kmalloc_request to
dasd_smalloc_request and remove the now unused function

vfio/ccw
- Refactor and improve pfn_array_alloc_pin/pfn_array_pin
- Add a new tracepoint for failed vfio/ccw requests
- Add a CCW translation improvement to accept more requests as valid
- Bug fixes"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390/dasd: only use preallocated requests
s390/dasd: reshuffle struct dasd_ccw_req
s390/dasd: remove dasd_kmalloc_set_cda
s390/dasd: move dasd_ccw_req to per request data
s390/dasd: simplify locking in process_final_queue
s390/cio: sanitize css_general_characteristics definition
vfio: ccw: add tracepoints for interesting error paths
vfio: ccw: set ccw->cda to NULL defensively
vfio: ccw: refactor and improve pfn_array_alloc_pin()
vfio: ccw: shorten kernel doc description for pfn_array_pin()
vfio: ccw: push down unsupported IDA check
vfio: ccw: fix error return in vfio_ccw_sch_event
s390/archrandom: Rework arch random implementation.
s390/net: add pnetid support

arch/s390/include/asm/css_chars.h

···
 
 struct css_general_char {
 	u64 : 12;
-	u32 dynio : 1;	 /* bit 12 */
-	u32 : 4;
-	u32 eadm : 1;	 /* bit 17 */
-	u32 : 23;
-	u32 aif : 1;	 /* bit 41 */
-	u32 : 3;
-	u32 mcss : 1;	 /* bit 45 */
-	u32 fcs : 1;	 /* bit 46 */
-	u32 : 1;
-	u32 ext_mb : 1;  /* bit 48 */
-	u32 : 7;
-	u32 aif_tdd : 1; /* bit 56 */
-	u32 : 1;
-	u32 qebsm : 1;	 /* bit 58 */
-	u32 : 2;
-	u32 aiv : 1;     /* bit 61 */
-	u32 : 5;
-	u32 aif_osa : 1; /* bit 67 */
-	u32 : 12;
-	u32 eadm_rf : 1; /* bit 80 */
-	u32 : 1;
-	u32 cib : 1;	 /* bit 82 */
-	u32 : 5;
-	u32 fcx : 1;	 /* bit 88 */
-	u32 : 19;
-	u32 alt_ssi : 1; /* bit 108 */
-	u32 : 1;
-	u32 narf : 1;	 /* bit 110 */
-	u32 : 12;
-	u32 util_str : 1;/* bit 123 */
+	u64 dynio : 1;	 /* bit 12 */
+	u64 : 4;
+	u64 eadm : 1;	 /* bit 17 */
+	u64 : 23;
+	u64 aif : 1;	 /* bit 41 */
+	u64 : 3;
+	u64 mcss : 1;	 /* bit 45 */
+	u64 fcs : 1;	 /* bit 46 */
+	u64 : 1;
+	u64 ext_mb : 1;  /* bit 48 */
+	u64 : 7;
+	u64 aif_tdd : 1; /* bit 56 */
+	u64 : 1;
+	u64 qebsm : 1;	 /* bit 58 */
+	u64 : 2;
+	u64 aiv : 1;	 /* bit 61 */
+	u64 : 2;
+
+	u64 : 3;
+	u64 aif_osa : 1; /* bit 67 */
+	u64 : 12;
+	u64 eadm_rf : 1; /* bit 80 */
+	u64 : 1;
+	u64 cib : 1;	 /* bit 82 */
+	u64 : 5;
+	u64 fcx : 1;	 /* bit 88 */
+	u64 : 19;
+	u64 alt_ssi : 1; /* bit 108 */
+	u64 : 1;
+	u64 narf : 1;	 /* bit 110 */
+	u64 : 12;
+	u64 util_str : 1;/* bit 123 */
 } __packed;
 
 extern struct css_general_char css_general_characteristics;

drivers/s390/block/dasd.c

···
 		device->hosts_dentry = pde;
 }
 
-/*
- * Allocate memory for a channel program with 'cplength' channel
- * command words and 'datasize' additional space. There are two
- * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
- * memory and 2) dasd_smalloc_request uses the static ccw memory
- * that gets allocated for each device.
- */
-struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
-					  int datasize,
-					  struct dasd_device *device)
-{
-	struct dasd_ccw_req *cqr;
-
-	/* Sanity checks */
-	BUG_ON(datasize > PAGE_SIZE ||
-	     (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
-
-	cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
-	if (cqr == NULL)
-		return ERR_PTR(-ENOMEM);
-	cqr->cpaddr = NULL;
-	if (cplength > 0) {
-		cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
-				      GFP_ATOMIC | GFP_DMA);
-		if (cqr->cpaddr == NULL) {
-			kfree(cqr);
-			return ERR_PTR(-ENOMEM);
-		}
-	}
-	cqr->data = NULL;
-	if (datasize > 0) {
-		cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
-		if (cqr->data == NULL) {
-			kfree(cqr->cpaddr);
-			kfree(cqr);
-			return ERR_PTR(-ENOMEM);
-		}
-	}
-	cqr->magic =  magic;
-	set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
-	dasd_get_device(device);
-	return cqr;
-}
-EXPORT_SYMBOL(dasd_kmalloc_request);
-
-struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
-					  int datasize,
-					  struct dasd_device *device)
+struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength, int datasize,
+					  struct dasd_device *device,
+					  struct dasd_ccw_req *cqr)
 {
 	unsigned long flags;
-	struct dasd_ccw_req *cqr;
-	char *data;
-	int size;
+	char *data, *chunk;
+	int size = 0;
 
-	size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
 	if (cplength > 0)
 		size += cplength * sizeof(struct ccw1);
 	if (datasize > 0)
 		size += datasize;
+	if (!cqr)
+		size += (sizeof(*cqr) + 7L) & -8L;
+
 	spin_lock_irqsave(&device->mem_lock, flags);
-	cqr = (struct dasd_ccw_req *)
-		dasd_alloc_chunk(&device->ccw_chunks, size);
+	data = chunk = dasd_alloc_chunk(&device->ccw_chunks, size);
 	spin_unlock_irqrestore(&device->mem_lock, flags);
-	if (cqr == NULL)
+	if (!chunk)
 		return ERR_PTR(-ENOMEM);
-	memset(cqr, 0, sizeof(struct dasd_ccw_req));
-	data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
-	cqr->cpaddr = NULL;
-	if (cplength > 0) {
-		cqr->cpaddr = (struct ccw1 *) data;
-		data += cplength*sizeof(struct ccw1);
-		memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
+	if (!cqr) {
+		cqr = (void *) data;
+		data += (sizeof(*cqr) + 7L) & -8L;
 	}
-	cqr->data = NULL;
+	memset(cqr, 0, sizeof(*cqr));
+	cqr->mem_chunk = chunk;
+	if (cplength > 0) {
+		cqr->cpaddr = data;
+		data += cplength * sizeof(struct ccw1);
+		memset(cqr->cpaddr, 0, cplength * sizeof(struct ccw1));
+	}
 	if (datasize > 0) {
 		cqr->data = data;
  		memset(cqr->data, 0, datasize);
···
 }
 EXPORT_SYMBOL(dasd_smalloc_request);
 
-/*
- * Free memory of a channel program. This function needs to free all the
- * idal lists that might have been created by dasd_set_cda and the
- * struct dasd_ccw_req itself.
- */
-void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
-{
-	struct ccw1 *ccw;
-
-	/* Clear any idals used for the request. */
-	ccw = cqr->cpaddr;
-	do {
-		clear_normalized_cda(ccw);
-	} while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
-	kfree(cqr->cpaddr);
-	kfree(cqr->data);
-	kfree(cqr);
-	dasd_put_device(device);
-}
-EXPORT_SYMBOL(dasd_kfree_request);
-
 void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
 {
 	unsigned long flags;
 
 	spin_lock_irqsave(&device->mem_lock, flags);
-	dasd_free_chunk(&device->ccw_chunks, cqr);
+	dasd_free_chunk(&device->ccw_chunks, cqr->mem_chunk);
 	spin_unlock_irqrestore(&device->mem_lock, flags);
 	dasd_put_device(device);
 }
···
 	}
 }
 
+static void __dasd_process_cqr(struct dasd_device *device,
+			       struct dasd_ccw_req *cqr)
+{
+	char errorstring[ERRORLENGTH];
+
+	switch (cqr->status) {
+	case DASD_CQR_SUCCESS:
+		cqr->status = DASD_CQR_DONE;
+		break;
+	case DASD_CQR_ERROR:
+		cqr->status = DASD_CQR_NEED_ERP;
+		break;
+	case DASD_CQR_CLEARED:
+		cqr->status = DASD_CQR_TERMINATED;
+		break;
+	default:
+		/* internal error 12 - wrong cqr status*/
+		snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
+		dev_err(&device->cdev->dev,
+			"An error occurred in the DASD device driver, "
+			"reason=%s\n", errorstring);
+		BUG();
+	}
+	if (cqr->callback)
+		cqr->callback(cqr, cqr->callback_data);
+}
+
 /*
  * the cqrs from the final queue are returned to the upper layer
  * by setting a dasd_block state and calling the callback function
···
 	struct list_head *l, *n;
 	struct dasd_ccw_req *cqr;
 	struct dasd_block *block;
-	void (*callback)(struct dasd_ccw_req *, void *data);
-	void *callback_data;
-	char errorstring[ERRORLENGTH];
 
 	list_for_each_safe(l, n, final_queue) {
 		cqr = list_entry(l, struct dasd_ccw_req, devlist);
 		list_del_init(&cqr->devlist);
 		block = cqr->block;
-		callback = cqr->callback;
-		callback_data = cqr->callback_data;
-		if (block)
+		if (!block) {
+			__dasd_process_cqr(device, cqr);
+		} else {
 			spin_lock_bh(&block->queue_lock);
-		switch (cqr->status) {
-		case DASD_CQR_SUCCESS:
-			cqr->status = DASD_CQR_DONE;
-			break;
-		case DASD_CQR_ERROR:
-			cqr->status = DASD_CQR_NEED_ERP;
-			break;
-		case DASD_CQR_CLEARED:
-			cqr->status = DASD_CQR_TERMINATED;
-			break;
-		default:
-			/* internal error 12 - wrong cqr status*/
-			snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
-			dev_err(&device->cdev->dev,
-				"An error occurred in the DASD device driver, "
-				"reason=%s\n", errorstring);
-			BUG();
-		}
-		if (cqr->callback != NULL)
-			(callback)(cqr, callback_data);
-		if (block)
+			__dasd_process_cqr(device, cqr);
 			spin_unlock_bh(&block->queue_lock);
+		}
 	}
 }
 
···
 	cqr->callback_data = req;
 	cqr->status = DASD_CQR_FILLED;
 	cqr->dq = dq;
-	*((struct dasd_ccw_req **) blk_mq_rq_to_pdu(req)) = cqr;
 
 	blk_mq_start_request(req);
 	spin_lock(&block->queue_lock);
···
 	unsigned long flags;
 	int rc = 0;
 
-	cqr = *((struct dasd_ccw_req **) blk_mq_rq_to_pdu(req));
+	cqr = blk_mq_rq_to_pdu(req);
 	if (!cqr)
 		return BLK_EH_DONE;
 
···
 	int rc;
 
 	block->tag_set.ops = &dasd_mq_ops;
-	block->tag_set.cmd_size = sizeof(struct dasd_ccw_req *);
+	block->tag_set.cmd_size = sizeof(struct dasd_ccw_req);
 	block->tag_set.nr_hw_queues = DASD_NR_HW_QUEUES;
 	block->tag_set.queue_depth = DASD_MAX_LCU_DEV * DASD_REQ_PER_DEV;
 	block->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
···
 	struct ccw1 *ccw;
 	unsigned long *idaw;
 
-	cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
+	cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device,
+				   NULL);
 
 	if (IS_ERR(cqr)) {
 		/* internal error 13 - Allocating the RDC request failed*/

drivers/s390/block/dasd_alias.c

···
 	int rc;
 	unsigned long flags;
 
-	cqr = dasd_kmalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */	+ 1 /* RSSD */,
+	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */	+ 1 /* RSSD */,
 				   (sizeof(struct dasd_psf_prssd_data)),
-				   device);
+				   device, NULL);
 	if (IS_ERR(cqr))
 		return PTR_ERR(cqr);
 	cqr->startdev = device;
···
 		lcu->flags |= NEED_UAC_UPDATE;
 		spin_unlock_irqrestore(&lcu->lock, flags);
 	}
-	dasd_kfree_request(cqr, cqr->memdev);
+	dasd_sfree_request(cqr, cqr->memdev);
 	return rc;
 }
 

drivers/s390/block/dasd_diag.c

···
 	/* Build the request */
 	datasize = sizeof(struct dasd_diag_req) +
 		count*sizeof(struct dasd_diag_bio);
-	cqr = dasd_smalloc_request(DASD_DIAG_MAGIC, 0, datasize, memdev);
+	cqr = dasd_smalloc_request(DASD_DIAG_MAGIC, 0, datasize, memdev,
+				   blk_mq_rq_to_pdu(req));
 	if (IS_ERR(cqr))
 		return cqr;
 

drivers/s390/block/dasd_eckd.c

···
 	}
 	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
 				   0, /* use rcd_buf as data ara */
-				   device);
+				   device, NULL);
 	if (IS_ERR(cqr)) {
 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 			      "Could not allocate RCD request");
···
 	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */	+ 1 /* RSSD */,
 				   (sizeof(struct dasd_psf_prssd_data) +
 				    sizeof(struct dasd_rssd_features)),
-				   device);
+				   device, NULL);
 	if (IS_ERR(cqr)) {
 		DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
 				"allocate initialization request");
···
 
 	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
 				  sizeof(struct dasd_psf_ssc_data),
-				  device);
+				   device, NULL);
 
 	if (IS_ERR(cqr)) {
 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
···
 
 	cplength = 8;
 	datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
-	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
+	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device,
+				   NULL);
 	if (IS_ERR(cqr))
 		return cqr;
 	ccw = cqr->cpaddr;
···
 	 */
 	itcw_size = itcw_calc_size(0, count, 0);
 
-	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
+	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev,
+				   NULL);
 	if (IS_ERR(cqr))
 		return cqr;
 
···
 	cplength += count;
 
 	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
-				  startdev);
+				   startdev, NULL);
 	if (IS_ERR(cqr))
 		return cqr;
 
···
 	}
 	/* Allocate the format ccw request. */
 	fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
-				   datasize, startdev);
+				   datasize, startdev, NULL);
 	if (IS_ERR(fcp))
 		return fcp;
 
···
 	}
 	/* Allocate the ccw request. */
 	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
-				   startdev);
+				   startdev, blk_mq_rq_to_pdu(req));
 	if (IS_ERR(cqr))
 		return cqr;
 	ccw = cqr->cpaddr;
···
 
 	/* Allocate the ccw request. */
 	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
-				   startdev);
+				   startdev, blk_mq_rq_to_pdu(req));
 	if (IS_ERR(cqr))
 		return cqr;
 	ccw = cqr->cpaddr;
···
 
 	/* Allocate the ccw request. */
 	itcw_size = itcw_calc_size(0, ctidaw, 0);
-	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
+	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev,
+				   blk_mq_rq_to_pdu(req));
 	if (IS_ERR(cqr))
 		return cqr;
 
···
 
 	/* Allocate the ccw request. */
 	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
-				   datasize, startdev);
+				   datasize, startdev, blk_mq_rq_to_pdu(req));
 	if (IS_ERR(cqr))
 		return cqr;
 
···
 		return -EACCES;
 
 	useglobal = 0;
-	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
+	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
 	if (IS_ERR(cqr)) {
 		mutex_lock(&dasd_reserve_mutex);
 		useglobal = 1;
···
 		return -EACCES;
 
 	useglobal = 0;
-	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
+	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
 	if (IS_ERR(cqr)) {
 		mutex_lock(&dasd_reserve_mutex);
 		useglobal = 1;
···
 		return -EACCES;
 
 	useglobal = 0;
-	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
+	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
 	if (IS_ERR(cqr)) {
 		mutex_lock(&dasd_reserve_mutex);
 		useglobal = 1;
···
 
 	useglobal = 0;
 	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
-				   sizeof(struct dasd_snid_data), device);
+				   sizeof(struct dasd_snid_data), device,
+				   NULL);
 	if (IS_ERR(cqr)) {
 		mutex_lock(&dasd_reserve_mutex);
 		useglobal = 1;
···
 	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
 				   (sizeof(struct dasd_psf_prssd_data) +
 				    sizeof(struct dasd_rssd_perf_stats_t)),
-				   device);
+				   device, NULL);
 	if (IS_ERR(cqr)) {
 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 			    "Could not allocate initialization request");
···
 	psf1 = psf_data[1];
 
 	/* setup CCWs for PSF + RSSD */
-	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
+	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2, 0, device, NULL);
 	if (IS_ERR(cqr)) {
 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 			"Could not allocate initialization request");
···
 	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */	+ 1 /* RSSD */,
 				   (sizeof(struct dasd_psf_prssd_data) +
 				    sizeof(struct dasd_rssd_messages)),
-				   device);
+				   device, NULL);
 	if (IS_ERR(cqr)) {
 		DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
 				"Could not allocate read message buffer request");
···
 
 	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */	+ 1 /* RSSD */,
 				   sizeof(struct dasd_psf_prssd_data) + 1,
-				   device);
+				   device, NULL);
 	if (IS_ERR(cqr)) {
 		DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
 				"Could not allocate read message buffer request");
···
 	int rc;
 
 	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
-				  sizeof(struct dasd_psf_cuir_response),
-				  device);
+				   sizeof(struct dasd_psf_cuir_response),
+				   device, NULL);
 
 	if (IS_ERR(cqr)) {
 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",

drivers/s390/block/dasd_eer.c

···
 		 * is a new ccw in device->eer_cqr. Free the "old"
 		 * snss request now.
 		 */
-		dasd_kfree_request(cqr, device);
+		dasd_sfree_request(cqr, device);
 }
 
 /*
···
 	if (rc)
 		goto out;
 
-	cqr = dasd_kmalloc_request(DASD_ECKD_MAGIC, 1 /* SNSS */,
-				   SNSS_DATA_SIZE, device);
+	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* SNSS */,
+				   SNSS_DATA_SIZE, device, NULL);
 	if (IS_ERR(cqr)) {
 		rc = -ENOMEM;
 		cqr = NULL;
···
 	spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 
 	if (cqr)
-		dasd_kfree_request(cqr, device);
+		dasd_sfree_request(cqr, device);
 
 	return rc;
 }
···
 	in_use = test_and_clear_bit(DASD_FLAG_EER_IN_USE, &device->flags);
 	spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 	if (cqr && !in_use)
-		dasd_kfree_request(cqr, device);
+		dasd_sfree_request(cqr, device);
 }
 
 /*

drivers/s390/block/dasd_fba.c

···
 	datasize = sizeof(struct DE_fba_data) +
 		nr_ccws * (sizeof(struct LO_fba_data) + sizeof(struct ccw1));
 
-	cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev);
+	cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev,
+				   blk_mq_rq_to_pdu(req));
 	if (IS_ERR(cqr))
 		return cqr;
 
···
 		datasize += (count - 1)*sizeof(struct LO_fba_data);
 	}
 	/* Allocate the ccw request. */
-	cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev);
+	cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev,
+				   blk_mq_rq_to_pdu(req));
 	if (IS_ERR(cqr))
 		return cqr;
 	ccw = cqr->cpaddr;

drivers/s390/block/dasd_int.h

···
 
 struct dasd_ccw_req {
 	unsigned int magic;		/* Eye catcher */
+	int intrc;			/* internal error, e.g. from start_IO */
 	struct list_head devlist;	/* for dasd_device request queue */
 	struct list_head blocklist;	/* for dasd_block request queue */
-
-	/* Where to execute what... */
 	struct dasd_block *block;	/* the originating block device */
 	struct dasd_device *memdev;	/* the device used to allocate this */
 	struct dasd_device *startdev;	/* device the request is started on */
 	struct dasd_device *basedev;	/* base device if no block->base */
 	void *cpaddr;			/* address of ccw or tcw */
+	short retries;			/* A retry counter */
 	unsigned char cpmode;		/* 0 = cmd mode, 1 = itcw */
 	char status;			/* status of this request */
-	short retries;			/* A retry counter */
+	char lpm;			/* logical path mask */
 	unsigned long flags;        	/* flags of this request */
 	struct dasd_queue *dq;
-
-	/* ... and how */
 	unsigned long starttime;	/* jiffies time of request start */
 	unsigned long expires;		/* expiration period in jiffies */
-	char lpm;			/* logical path mask */
 	void *data;			/* pointer to data area */
-
-	/* these are important for recovering erroneous requests          */
-	int intrc;			/* internal error, e.g. from start_IO */
 	struct irb irb;			/* device status in case of an error */
 	struct dasd_ccw_req *refers;	/* ERP-chain queueing. */
 	void *function; 		/* originating ERP action */
+	void *mem_chunk;
 
-	/* these are for statistics only */
 	unsigned long buildclk;		/* TOD-clock of request generation */
 	unsigned long startclk;		/* TOD-clock of request start */
 	unsigned long stopclk;		/* TOD-clock of request interrupt */
 	unsigned long endclk;		/* TOD-clock of request termination */
 
-        /* Callback that is called after reaching final status. */
 	void (*callback)(struct dasd_ccw_req *, void *data);
 	void *callback_data;
 };
···
 extern struct kmem_cache *dasd_page_cache;
 
 struct dasd_ccw_req *
-dasd_kmalloc_request(int , int, int, struct dasd_device *);
-struct dasd_ccw_req *
-dasd_smalloc_request(int , int, int, struct dasd_device *);
-void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
+dasd_smalloc_request(int, int, int, struct dasd_device *, struct dasd_ccw_req *);
 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
 void dasd_wakeup_cb(struct dasd_ccw_req *, void *);
-
-static inline int
-dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
-{
-	return set_normalized_cda(ccw, cda);
-}
 
 struct dasd_device *dasd_alloc_device(void);
 void dasd_free_device(struct dasd_device *);

drivers/s390/cio/Makefile

···
 
 # The following is required for define_trace.h to find ./trace.h
 CFLAGS_trace.o := -I$(src)
+CFLAGS_vfio_ccw_fsm.o := -I$(src)
 
 obj-y += airq.o blacklist.o chsc.o cio.o css.o chp.o idset.o isc.o \
 	fcx.o itcw.o crw.o ccwreq.o trace.o ioasm.o

drivers/s390/cio/vfio_ccw_cp.c

···
 #define CCWCHAIN_LEN_MAX	256
 
 struct pfn_array {
+	/* Starting guest physical I/O address. */
 	unsigned long		pa_iova;
+	/* Array that stores PFNs of the pages need to pin. */
 	unsigned long		*pa_iova_pfn;
+	/* Array that receives PFNs of the pages pinned. */
 	unsigned long		*pa_pfn;
+	/* Number of pages pinned from @pa_iova. */
 	int			pa_nr;
 };
 
···
 };
 
 /*
- * pfn_array_pin() - pin user pages in memory
+ * pfn_array_alloc_pin() - alloc memory for PFNs, then pin user pages in memory
  * @pa: pfn_array on which to perform the operation
  * @mdev: the mediated device to perform pin/unpin operations
+ * @iova: target guest physical address
+ * @len: number of bytes that should be pinned from @iova
  *
- * Attempt to pin user pages in memory.
+ * Attempt to allocate memory for PFNs, and pin user pages in memory.
  *
  * Usage of pfn_array:
- * @pa->pa_iova     starting guest physical I/O address. Assigned by caller.
- * @pa->pa_iova_pfn array that stores PFNs of the pages need to pin. Allocated
- *                  by caller.
- * @pa->pa_pfn      array that receives PFNs of the pages pinned. Allocated by
- *                  caller.
- * @pa->pa_nr       number of pages from @pa->pa_iova to pin. Assigned by
- *                  caller.
- *                  number of pages pinned. Assigned by callee.
+ * We expect (pa_nr == 0) and (pa_iova_pfn == NULL), any field in
+ * this structure will be filled in by this function.
  *
  * Returns:
  *   Number of pages pinned on success.
- *   If @pa->pa_nr is 0 or negative, returns 0.
+ *   If @pa->pa_nr is not 0, or @pa->pa_iova_pfn is not NULL initially,
+ *   returns -EINVAL.
  *   If no pages were pinned, returns -errno.
  */
-static int pfn_array_pin(struct pfn_array *pa, struct device *mdev)
-{
-	int i, ret;
-
-	if (pa->pa_nr <= 0) {
-		pa->pa_nr = 0;
-		return 0;
-	}
-
-	pa->pa_iova_pfn[0] = pa->pa_iova >> PAGE_SHIFT;
-	for (i = 1; i < pa->pa_nr; i++)
-		pa->pa_iova_pfn[i] = pa->pa_iova_pfn[i - 1] + 1;
-
-	ret = vfio_pin_pages(mdev, pa->pa_iova_pfn, pa->pa_nr,
-			     IOMMU_READ | IOMMU_WRITE, pa->pa_pfn);
-
-	if (ret > 0 && ret != pa->pa_nr) {
-		vfio_unpin_pages(mdev, pa->pa_iova_pfn, ret);
-		pa->pa_nr = 0;
-		return 0;
-	}
-
-	return ret;
-}
-
-/* Unpin the pages before releasing the memory. */
-static void pfn_array_unpin_free(struct pfn_array *pa, struct device *mdev)
-{
-	vfio_unpin_pages(mdev, pa->pa_iova_pfn, pa->pa_nr);
-	pa->pa_nr = 0;
-	kfree(pa->pa_iova_pfn);
-}
-
-/* Alloc memory for PFNs, then pin pages with them. */
 static int pfn_array_alloc_pin(struct pfn_array *pa, struct device *mdev,
 			       u64 iova, unsigned int len)
 {
-	int ret = 0;
+	int i, ret = 0;
 
 	if (!len)
 		return 0;
 
-	if (pa->pa_nr)
+	if (pa->pa_nr || pa->pa_iova_pfn)
 		return -EINVAL;
 
 	pa->pa_iova = iova;
···
 		return -ENOMEM;
 	pa->pa_pfn = pa->pa_iova_pfn + pa->pa_nr;
 
-	ret = pfn_array_pin(pa, mdev);
+	pa->pa_iova_pfn[0] = pa->pa_iova >> PAGE_SHIFT;
+	for (i = 1; i < pa->pa_nr; i++)
+		pa->pa_iova_pfn[i] = pa->pa_iova_pfn[i - 1] + 1;
 
-	if (ret > 0)
-		return ret;
-	else if (!ret)
+	ret = vfio_pin_pages(mdev, pa->pa_iova_pfn, pa->pa_nr,
+			     IOMMU_READ | IOMMU_WRITE, pa->pa_pfn);
+
+	if (ret < 0) {
+		goto err_out;
+	} else if (ret > 0 && ret != pa->pa_nr) {
+		vfio_unpin_pages(mdev, pa->pa_iova_pfn, ret);
 		ret = -EINVAL;
-
-	kfree(pa->pa_iova_pfn);
+		goto err_out;
+	}
 
 	return ret;
+
+err_out:
+	pa->pa_nr = 0;
+	kfree(pa->pa_iova_pfn);
+	pa->pa_iova_pfn = NULL;
+
+	return ret;
+}
+
+/* Unpin the pages before releasing the memory. */
+static void pfn_array_unpin_free(struct pfn_array *pa, struct device *mdev)
+{
+	vfio_unpin_pages(mdev, pa->pa_iova_pfn, pa->pa_nr);
+	pa->pa_nr = 0;
+	kfree(pa->pa_iova_pfn);
 }
 
 static int pfn_array_table_init(struct pfn_array_table *pat, int nr)
···
  * This is the chain length not considering any TICs.
  * You need to do a new round for each TIC target.
  *
+ * The program is also validated for absence of not yet supported
+ * indirect data addressing scenarios.
+ *
  * Returns: the length of the ccw chain or -errno.
  */
 static int ccwchain_calc_length(u64 iova, struct channel_program *cp)
···
 	cnt = 0;
 	do {
 		cnt++;
+
+		/*
+		 * As we don't want to fail direct addressing even if the
+		 * orb specified one of the unsupported formats, we defer
+		 * checking for IDAWs in unsupported formats to here.
+		 */
+		if ((!cp->orb.cmd.c64 || cp->orb.cmd.i2k) && ccw_is_idal(ccw))
+			return -EOPNOTSUPP;
 
 		if ((!ccw_is_chain(ccw)) && (!ccw_is_tic(ccw)))
 			break;
···
 	struct ccw1 *ccw;
 	struct pfn_array_table *pat;
 	unsigned long *idaws;
-	int idaw_nr;
+	int ret;
 
 	ccw = chain->ch_ccw + idx;
 
···
 	 * needed when translating a direct ccw to a idal ccw.
 	 */
 	pat = chain->ch_pat + idx;
-	if (pfn_array_table_init(pat, 1))
-		return -ENOMEM;
-	idaw_nr = pfn_array_alloc_pin(pat->pat_pa, cp->mdev,
-				      ccw->cda, ccw->count);
-	if (idaw_nr < 0)
-		return idaw_nr;
+	ret = pfn_array_table_init(pat, 1);
+	if (ret)
+		goto out_init;
+
+	ret = pfn_array_alloc_pin(pat->pat_pa, cp->mdev, ccw->cda, ccw->count);
+	if (ret < 0)
+		goto out_init;
 
 	/* Translate this direct ccw to a idal ccw. */
-	idaws = kcalloc(idaw_nr, sizeof(*idaws), GFP_DMA | GFP_KERNEL);
+	idaws = kcalloc(ret, sizeof(*idaws), GFP_DMA | GFP_KERNEL);
 	if (!idaws) {
-		pfn_array_table_unpin_free(pat, cp->mdev);
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto out_unpin;
 	}
 	ccw->cda = (__u32) virt_to_phys(idaws);
 	ccw->flags |= CCW_FLAG_IDA;
···
 	pfn_array_table_idal_create_words(pat, idaws);
 
 	return 0;
+
+out_unpin:
+	pfn_array_table_unpin_free(pat, cp->mdev);
+out_init:
+	ccw->cda = 0;
+	return ret;
 }
 
 static int ccwchain_fetch_idal(struct ccwchain *chain,
···
 	pat = chain->ch_pat + idx;
 	ret = pfn_array_table_init(pat, idaw_nr);
 	if (ret)
-		return ret;
+		goto out_init;
 
 	/* Translate idal ccw to use new allocated idaws. */
 	idaws = kzalloc(idaw_len, GFP_DMA | GFP_KERNEL);
···
 	kfree(idaws);
 out_unpin:
 	pfn_array_table_unpin_free(pat, cp->mdev);
+out_init:
+	ccw->cda = 0;
 	return ret;
 }
 
···
 	/*
 	 * XXX:
 	 * Only support prefetch enable mode now.
-	 * Only support 64bit addressing idal.
-	 * Only support 4k IDAW.
 	 */
-	if (!orb->cmd.pfch || !orb->cmd.c64 || orb->cmd.i2k)
+	if (!orb->cmd.pfch)
 		return -EOPNOTSUPP;
 
 	INIT_LIST_HEAD(&cp->ccwchain_list);
···
 	ret = ccwchain_loop_tic(chain, cp);
 	if (ret)
 		cp_unpin_free(cp);
+	/* It is safe to force: if not set but idals used
+	 * ccwchain_calc_length returns an error.
+	 */
+	cp->orb.cmd.c64 = 1;
 
 	return ret;
 }

drivers/s390/cio/vfio_ccw_drv.c

···
 {
 	struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev);
 	unsigned long flags;
+	int rc = -EAGAIN;
 
 	spin_lock_irqsave(sch->lock, flags);
 	if (!device_is_registered(&sch->dev))
···
 
 	if (cio_update_schib(sch)) {
 		vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_NOT_OPER);
+		rc = 0;
 		goto out_unlock;
 	}
 
···
 		private->state = private->mdev ? VFIO_CCW_STATE_IDLE :
 				 VFIO_CCW_STATE_STANDBY;
 	}
+	rc = 0;
 
 out_unlock:
 	spin_unlock_irqrestore(sch->lock, flags);
 
-	return 0;
+	return rc;
 }
 
 static struct css_device_id vfio_ccw_sch_ids[] = {

drivers/s390/cio/vfio_ccw_fsm.c

···
 #include "ioasm.h"
 #include "vfio_ccw_private.h"
 
+#define CREATE_TRACE_POINTS
+#include "vfio_ccw_trace.h"
+
 static int fsm_io_helper(struct vfio_ccw_private *private)
 {
 	struct subchannel *sch;
···
 	 */
 	cio_disable_subchannel(sch);
 }
+inline struct subchannel_id get_schid(struct vfio_ccw_private *p)
+{
+	return p->sch->schid;
+}
 
 /*
  * Deal with the ccw command request from the userspace.
···
 	union scsw *scsw = &private->scsw;
 	struct ccw_io_region *io_region = &private->io_region;
 	struct mdev_device *mdev = private->mdev;
+	char *errstr = "request";
 
 	private->state = VFIO_CCW_STATE_BOXED;
 
···
 		/* Don't try to build a cp if transport mode is specified. */
 		if (orb->tm.b) {
 			io_region->ret_code = -EOPNOTSUPP;
+			errstr = "transport mode";
 			goto err_out;
 		}
 		io_region->ret_code = cp_init(&private->cp, mdev_dev(mdev),
 					      orb);
-		if (io_region->ret_code)
+		if (io_region->ret_code) {
+			errstr = "cp init";
 			goto err_out;
+		}
 
 		io_region->ret_code = cp_prefetch(&private->cp);
 		if (io_region->ret_code) {
+			errstr = "cp prefetch";
 			cp_free(&private->cp);
 			goto err_out;
 		}
···
 		/* Start channel program and wait for I/O interrupt. */
 		io_region->ret_code = fsm_io_helper(private);
 		if (io_region->ret_code) {
+			errstr = "cp fsm_io_helper";
 			cp_free(&private->cp);
 			goto err_out;
 		}
···
 
 err_out:
 	private->state = VFIO_CCW_STATE_IDLE;
+	trace_vfio_ccw_io_fctl(scsw->cmd.fctl, get_schid(private),
+			       io_region->ret_code, errstr);
 }
 
 /*

drivers/s390/cio/vfio_ccw_trace.h

···
+/* SPDX-License-Identifier: GPL-2.0
+ * Tracepoints for vfio_ccw driver
+ *
+ * Copyright IBM Corp. 2018
+ *
+ * Author(s): Dong Jia Shi <[e-mail]>
+ *            Halil Pasic <[e-mail]>
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM vfio_ccw
+
+#if !defined(_VFIO_CCW_TRACE_) || defined(TRACE_HEADER_MULTI_READ)
+#define _VFIO_CCW_TRACE_
+
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(vfio_ccw_io_fctl,
+	TP_PROTO(int fctl, struct subchannel_id schid, int errno, char *errstr),
+	TP_ARGS(fctl, schid, errno, errstr),
+
+	TP_STRUCT__entry(
+		__field(int, fctl)
+		__field_struct(struct subchannel_id, schid)
+		__field(int, errno)
+		__field(char*, errstr)
+	),
+
+	TP_fast_assign(
+		__entry->fctl = fctl;
+		__entry->schid = schid;
+		__entry->errno = errno;
+		__entry->errstr = errstr;
+	),
+
+	TP_printk("schid=%x.%x.%04x fctl=%x errno=%d info=%s",
+		  __entry->schid.cssid,
+		  __entry->schid.ssid,
+		  __entry->schid.sch_no,
+		  __entry->fctl,
+		  __entry->errno,
+		  __entry->errstr)
+);
+
+#endif /* _VFIO_CCW_TRACE_ */
+
+/* This part must be outside protection */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE vfio_ccw_trace
+
+#include <trace/define_trace.h>