[PATCH] IB/ipath: allow diags on any unit

There is no longer a /dev/ipath_diag file; instead, there's
/dev/ipath_diag0, 1, etc.

It's still not possible to have diags run on more than one unit at a time,
but that's easy to fix at some point.
Signed-off-by: Bryan O'Sullivan <bryan.osullivan@qlogic.com>
Cc: "Michael S. Tsirkin" <mst@mellanox.co.il>
Cc: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/infiniband/hw/ipath/ipath_diag.c

@@ -67,18 +67,20 @@ static struct file_operations diag_file_ops = {
 	.release = ipath_diag_release
 };
 
-static struct cdev *diag_cdev;
-static struct class_device *diag_class_dev;
-
-int ipath_diag_init(void)
+int ipath_diag_add(struct ipath_devdata *dd)
 {
-	return ipath_cdev_init(IPATH_DIAG_MINOR, "ipath_diag",
-			       &diag_file_ops, &diag_cdev, &diag_class_dev);
+	char name[16];
+
+	snprintf(name, sizeof(name), "ipath_diag%d", dd->ipath_unit);
+
+	return ipath_cdev_init(IPATH_DIAG_MINOR_BASE + dd->ipath_unit, name,
+			       &diag_file_ops, &dd->diag_cdev,
+			       &dd->diag_class_dev);
 }
 
-void ipath_diag_cleanup(void)
+void ipath_diag_remove(struct ipath_devdata *dd)
 {
-	ipath_cdev_cleanup(&diag_cdev, &diag_class_dev);
+	ipath_cdev_cleanup(&dd->diag_cdev, &dd->diag_class_dev);
 }
 
 /**
@@ -102,8 +104,7 @@ static int ipath_read_umem64(struct ipath_devdata *dd, void __user *uaddr,
 	int ret;
 
 	/* not very efficient, but it works for now */
-	if (reg_addr < dd->ipath_kregbase ||
-	    reg_end > dd->ipath_kregend) {
+	if (reg_addr < dd->ipath_kregbase || reg_end > dd->ipath_kregend) {
 		ret = -EINVAL;
 		goto bail;
 	}
@@ -140,8 +141,7 @@ static int ipath_write_umem64(struct ipath_devdata *dd, void __iomem *caddr,
 	int ret;
 
 	/* not very efficient, but it works for now */
-	if (reg_addr < dd->ipath_kregbase ||
-	    reg_end > dd->ipath_kregend) {
+	if (reg_addr < dd->ipath_kregbase || reg_end > dd->ipath_kregend) {
 		ret = -EINVAL;
 		goto bail;
 	}
@@ -240,59 +240,45 @@ static int ipath_write_umem32(struct ipath_devdata *dd, void __iomem *caddr,
 
 static int ipath_diag_open(struct inode *in, struct file *fp)
 {
+	int unit = iminor(in) - IPATH_DIAG_MINOR_BASE;
 	struct ipath_devdata *dd;
-	int unit = 0; /* XXX this is bogus */
-	unsigned long flags;
 	int ret;
 
-	dd = ipath_lookup(unit);
-
 	mutex_lock(&ipath_mutex);
-	spin_lock_irqsave(&ipath_devs_lock, flags);
 
 	if (ipath_diag_inuse) {
 		ret = -EBUSY;
 		goto bail;
 	}
 
-	list_for_each_entry(dd, &ipath_dev_list, ipath_list) {
-		/*
-		 * we need at least one infinipath device to be present
-		 * (don't use INITTED, because we want to be able to open
-		 * even if device is in freeze mode, which cleared INITTED).
-		 * There is a small amount of risk to this, which is why we
-		 * also verify kregbase is set.
-		 */
+	dd = ipath_lookup(unit);
 
-		if (!(dd->ipath_flags & IPATH_PRESENT) ||
-		    !dd->ipath_kregbase)
-			continue;
+	if (dd == NULL || !(dd->ipath_flags & IPATH_PRESENT) ||
+	    !dd->ipath_kregbase) {
+		ret = -ENODEV;
+		goto bail;
+	}
 
+	fp->private_data = dd;
 	ipath_diag_inuse = 1;
 	diag_set_link = 0;
 	ret = 0;
-		goto bail;
-	}
-
-	ret = -ENODEV;
-
-bail:
-	spin_unlock_irqrestore(&ipath_devs_lock, flags);
 
 	/* Only expose a way to reset the device if we
 	   make it into diag mode. */
-	if (ret == 0)
 	ipath_expose_reset(&dd->pcidev->dev);
 
+bail:
 	mutex_unlock(&ipath_mutex);
 
 	return ret;
 }
 
-static int ipath_diag_release(struct inode *i, struct file *f)
+static int ipath_diag_release(struct inode *in, struct file *fp)
 {
 	mutex_lock(&ipath_mutex);
 	ipath_diag_inuse = 0;
+	fp->private_data = NULL;
 	mutex_unlock(&ipath_mutex);
 	return 0;
 }
@@ -300,17 +286,10 @@ static int ipath_diag_release(struct inode *i, struct file *f)
 static ssize_t ipath_diag_read(struct file *fp, char __user *data,
 			       size_t count, loff_t *off)
 {
-	int unit = 0; /* XXX provide for reads on other units some day */
-	struct ipath_devdata *dd;
+	struct ipath_devdata *dd = fp->private_data;
 	void __iomem *kreg_base;
 	ssize_t ret;
 
-	dd = ipath_lookup(unit);
-	if (!dd) {
-		ret = -ENODEV;
-		goto bail;
-	}
-
 	kreg_base = dd->ipath_kregbase;
 
 	if (count == 0)
@@ -329,23 +308,16 @@ static ssize_t ipath_diag_read(struct file *fp, char __user *data,
 		ret = count;
 	}
 
-bail:
 	return ret;
 }
 
 static ssize_t ipath_diag_write(struct file *fp, const char __user *data,
 				size_t count, loff_t *off)
 {
-	int unit = 0; /* XXX this is bogus */
-	struct ipath_devdata *dd;
+	struct ipath_devdata *dd = fp->private_data;
 	void __iomem *kreg_base;
 	ssize_t ret;
 
-	dd = ipath_lookup(unit);
-	if (!dd) {
-		ret = -ENODEV;
-		goto bail;
-	}
 	kreg_base = dd->ipath_kregbase;
 
 	if (count == 0)
@@ -364,6 +336,5 @@ static ssize_t ipath_diag_write(struct file *fp, const char __user *data,
 		ret = count;
 	}
 
-bail:
 	return ret;
 }

drivers/infiniband/hw/ipath/ipath_driver.c

@@ -546,6 +546,7 @@ static int __devinit ipath_init_one(struct pci_dev *pdev,
 	ipath_device_create_group(&pdev->dev, dd);
 	ipathfs_add_device(dd);
 	ipath_user_add(dd);
+	ipath_diag_add(dd);
 	ipath_layer_add(dd);
 
 	goto bail;
@@ -578,8 +579,9 @@ static void __devexit ipath_remove_one(struct pci_dev *pdev)
 		return;
 
 	dd = pci_get_drvdata(pdev);
-	ipath_layer_del(dd);
-	ipath_user_del(dd);
+	ipath_layer_remove(dd);
+	ipath_diag_remove(dd);
+	ipath_user_remove(dd);
 	ipathfs_remove_device(dd);
 	ipath_device_remove_group(&pdev->dev, dd);
 	ipath_cdbg(VERBOSE, "Releasing pci memory regions, dd %p, "

drivers/infiniband/hw/ipath/ipath_file_ops.c

@@ -1443,16 +1443,16 @@ static int find_best_unit(struct file *fp)
 
 static int ipath_open(struct inode *in, struct file *fp)
 {
-	int ret, minor;
+	int ret, user_minor;
 
 	mutex_lock(&ipath_mutex);
 
-	minor = iminor(in);
+	user_minor = iminor(in) - IPATH_USER_MINOR_BASE;
 	ipath_cdbg(VERBOSE, "open on dev %lx (minor %d)\n",
-		   (long)in->i_rdev, minor);
+		   (long)in->i_rdev, user_minor);
 
-	if (minor)
-		ret = find_free_port(minor - 1, fp);
+	if (user_minor)
+		ret = find_free_port(user_minor - 1, fp);
 	else
 		ret = find_best_unit(fp);
 
@@ -1860,19 +1860,12 @@ int ipath_user_add(struct ipath_devdata *dd)
 				      "error %d\n", -ret);
 			goto bail;
 		}
-		ret = ipath_diag_init();
-		if (ret < 0) {
-			ipath_dev_err(dd, "Unable to set up diag support: "
-				      "error %d\n", -ret);
-			goto bail_sma;
-		}
-
 		ret = init_cdev(0, "ipath", &ipath_file_ops, &wildcard_cdev,
 				&wildcard_class_dev);
 		if (ret < 0) {
 			ipath_dev_err(dd, "Could not create wildcard "
 				      "minor: error %d\n", -ret);
-			goto bail_diag;
+			goto bail_sma;
 		}
 
 		atomic_set(&user_setup, 1);
@@ -1881,31 +1874,28 @@ int ipath_user_add(struct ipath_devdata *dd)
 	snprintf(name, sizeof(name), "ipath%d", dd->ipath_unit);
 
 	ret = init_cdev(dd->ipath_unit + 1, name, &ipath_file_ops,
-			&dd->cdev, &dd->class_dev);
+			&dd->user_cdev, &dd->user_class_dev);
 	if (ret < 0)
 		ipath_dev_err(dd, "Could not create user minor %d, %s\n",
 			      dd->ipath_unit + 1, name);
 
 	goto bail;
 
-bail_diag:
-	ipath_diag_cleanup();
 bail_sma:
 	user_cleanup();
 bail:
 	return ret;
 }
 
-void ipath_user_del(struct ipath_devdata *dd)
+void ipath_user_remove(struct ipath_devdata *dd)
 {
-	cleanup_cdev(&dd->cdev, &dd->class_dev);
+	cleanup_cdev(&dd->user_cdev, &dd->user_class_dev);
 
 	if (atomic_dec_return(&user_count) == 0) {
 		if (atomic_read(&user_setup) == 0)
 			goto bail;
 
 		cleanup_cdev(&wildcard_cdev, &wildcard_class_dev);
-		ipath_diag_cleanup();
 		user_cleanup();
 
 		atomic_set(&user_setup, 0);

drivers/infiniband/hw/ipath/ipath_kernel.h

@@ -355,8 +355,10 @@ struct ipath_devdata {
 	char *ipath_freezemsg;
 	/* pci access data structure */
 	struct pci_dev *pcidev;
-	struct cdev *cdev;
-	struct class_device *class_dev;
+	struct cdev *user_cdev;
+	struct cdev *diag_cdev;
+	struct class_device *user_class_dev;
+	struct class_device *diag_class_dev;
 	/* timer used to prevent stats overflow, error throttling, etc. */
 	struct timer_list ipath_stats_timer;
 	/* check for stale messages in rcv queue */
@@ -538,7 +540,7 @@ extern int __ipath_verbs_piobufavail(struct ipath_devdata *);
 extern int __ipath_verbs_rcv(struct ipath_devdata *, void *, void *, u32);
 
 void ipath_layer_add(struct ipath_devdata *);
-void ipath_layer_del(struct ipath_devdata *);
+void ipath_layer_remove(struct ipath_devdata *);
 
 int ipath_init_chip(struct ipath_devdata *, int);
 int ipath_enable_wc(struct ipath_devdata *dd);
@@ -552,14 +554,14 @@ int ipath_cdev_init(int minor, char *name, struct file_operations *fops,
 void ipath_cdev_cleanup(struct cdev **cdevp,
 			struct class_device **class_devp);
 
-int ipath_diag_init(void);
-void ipath_diag_cleanup(void);
+int ipath_diag_add(struct ipath_devdata *);
+void ipath_diag_remove(struct ipath_devdata *);
 void ipath_diag_bringup_link(struct ipath_devdata *);
 
 extern wait_queue_head_t ipath_sma_state_wait;
 
 int ipath_user_add(struct ipath_devdata *dd);
-void ipath_user_del(struct ipath_devdata *dd);
+void ipath_user_remove(struct ipath_devdata *dd);
 
 struct sk_buff *ipath_alloc_skb(struct ipath_devdata *dd, gfp_t);
 
@@ -843,9 +845,10 @@ extern struct mutex ipath_mutex;
 
 #define IPATH_DRV_NAME		"ipath_core"
 #define IPATH_MAJOR		233
+#define IPATH_USER_MINOR_BASE	0
 #define IPATH_SMA_MINOR		128
-#define IPATH_DIAG_MINOR	129
-#define IPATH_NMINORS		130
+#define IPATH_DIAG_MINOR_BASE	129
+#define IPATH_NMINORS		255
 
 #define ipath_dev_err(dd,fmt,...) \
 	do { \

drivers/infiniband/hw/ipath/ipath_layer.c

@@ -404,7 +404,7 @@ void ipath_layer_add(struct ipath_devdata *dd)
 	mutex_unlock(&ipath_layer_mutex);
 }
 
-void ipath_layer_del(struct ipath_devdata *dd)
+void ipath_layer_remove(struct ipath_devdata *dd)
 {
 	mutex_lock(&ipath_layer_mutex);