Merge branches 'for-3.15/upstream-fixes' and 'for-3.16/upstream' into for-linus

Conflicts:
	drivers/hid/hid-sensor-hub.c

8 files changed, 151 insertions, 40 deletions

diff --git a/drivers/rapidio/devices/tsi721.c b/drivers/rapidio/devices/tsi721.c
index ff7cbf2d28e3..1753dc693c15 100644
--- a/drivers/rapidio/devices/tsi721.c
+++ b/drivers/rapidio/devices/tsi721.c
@@ -2256,6 +2256,7 @@ static int tsi721_setup_mport(struct tsi721_device *priv)
 	mport->phy_type = RIO_PHY_SERIAL;
 	mport->priv = (void *)priv;
 	mport->phys_efptr = 0x100;
+	mport->dev.parent = &pdev->dev;
 	priv->mport = mport;
 
 	INIT_LIST_HEAD(&mport->dbells);
diff --git a/drivers/rapidio/devices/tsi721.h b/drivers/rapidio/devices/tsi721.h
index 7061ac0ad428..0305675270ee 100644
--- a/drivers/rapidio/devices/tsi721.h
+++ b/drivers/rapidio/devices/tsi721.h
@@ -644,6 +644,9 @@ enum tsi721_smsg_int_flag {
 
 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
 
+#define TSI721_BDMA_BD_RING_SZ	128
+#define TSI721_BDMA_MAX_BCOUNT	(TSI721_DMAD_BCOUNT1 + 1)
+
 struct tsi721_tx_desc {
 	struct dma_async_tx_descriptor	txd;
 	struct tsi721_dma_desc		*hw_desc;
@@ -652,6 +655,7 @@ struct tsi721_tx_desc {
 	u64				rio_addr;
 	/* upper 2-bits of 66-bit RIO address */
 	u8				rio_addr_u;
+	u32				bcount;
 	bool				interrupt;
 	struct list_head		desc_node;
 	struct list_head		tx_list;
diff --git a/drivers/rapidio/devices/tsi721_dma.c b/drivers/rapidio/devices/tsi721_dma.c
index 91245f5dbe81..9b60b1f3261c 100644
--- a/drivers/rapidio/devices/tsi721_dma.c
+++ b/drivers/rapidio/devices/tsi721_dma.c
@@ -304,35 +304,17 @@ struct tsi721_tx_desc *tsi721_desc_get(struct tsi721_bdma_chan *bdma_chan)
 }
 
 static int
-tsi721_fill_desc(struct tsi721_bdma_chan *bdma_chan,
-	struct tsi721_tx_desc *desc, struct scatterlist *sg,
+tsi721_desc_fill_init(struct tsi721_tx_desc *desc, struct scatterlist *sg,
 	enum dma_rtype rtype, u32 sys_size)
 {
 	struct tsi721_dma_desc *bd_ptr = desc->hw_desc;
 	u64 rio_addr;
 
-	if (sg_dma_len(sg) > TSI721_DMAD_BCOUNT1 + 1) {
-		dev_err(bdma_chan->dchan.device->dev,
-			"SG element is too large\n");
-		return -EINVAL;
-	}
-
-	dev_dbg(bdma_chan->dchan.device->dev,
-		"desc: 0x%llx, addr: 0x%llx len: 0x%x\n",
-		(u64)desc->txd.phys, (unsigned long long)sg_dma_address(sg),
-		sg_dma_len(sg));
-
-	dev_dbg(bdma_chan->dchan.device->dev,
-		"bd_ptr = %p did=%d raddr=0x%llx\n",
-		bd_ptr, desc->destid, desc->rio_addr);
-
 	/* Initialize DMA descriptor */
 	bd_ptr->type_id = cpu_to_le32((DTYPE1 << 29) |
 					(rtype << 19) | desc->destid);
-	if (desc->interrupt)
-		bd_ptr->type_id |= cpu_to_le32(TSI721_DMAD_IOF);
 	bd_ptr->bcount = cpu_to_le32(((desc->rio_addr & 0x3) << 30) |
-					(sys_size << 26) | sg_dma_len(sg));
+				     (sys_size << 26));
 	rio_addr = (desc->rio_addr >> 2) |
 				((u64)(desc->rio_addr_u & 0x3) << 62);
 	bd_ptr->raddr_lo = cpu_to_le32(rio_addr & 0xffffffff);
@@ -346,6 +328,20 @@ tsi721_fill_desc(struct tsi721_bdma_chan *bdma_chan,
 	return 0;
 }
 
+static int
+tsi721_desc_fill_end(struct tsi721_tx_desc *desc)
+{
+	struct tsi721_dma_desc *bd_ptr = desc->hw_desc;
+
+	/* Update DMA descriptor */
+	if (desc->interrupt)
+		bd_ptr->type_id |= cpu_to_le32(TSI721_DMAD_IOF);
+	bd_ptr->bcount |= cpu_to_le32(desc->bcount & TSI721_DMAD_BCOUNT1);
+
+	return 0;
+}
+
+
 static void tsi721_dma_chain_complete(struct tsi721_bdma_chan *bdma_chan,
 				      struct tsi721_tx_desc *desc)
 {
@@ -674,6 +670,7 @@ struct dma_async_tx_descriptor *tsi721_prep_rio_sg(struct dma_chan *dchan,
 	unsigned int i;
 	u32 sys_size = dma_to_mport(dchan->device)->sys_size;
 	enum dma_rtype rtype;
+	dma_addr_t next_addr = -1;
 
 	if (!sgl || !sg_len) {
 		dev_err(dchan->device->dev, "%s: No SG list\n", __func__);
@@ -704,36 +701,84 @@ struct dma_async_tx_descriptor *tsi721_prep_rio_sg(struct dma_chan *dchan,
 	for_each_sg(sgl, sg, sg_len, i) {
 		int err;
 
-		dev_dbg(dchan->device->dev, "%s: sg #%d\n", __func__, i);
+		if (sg_dma_len(sg) > TSI721_BDMA_MAX_BCOUNT) {
+			dev_err(dchan->device->dev,
+				"%s: SG entry %d is too large\n", __func__, i);
+			goto err_desc_put;
+		}
+
+		/*
+		 * If this sg entry forms contiguous block with previous one,
+		 * try to merge it into existing DMA descriptor
+		 */
+		if (desc) {
+			if (next_addr == sg_dma_address(sg) &&
+			    desc->bcount + sg_dma_len(sg) <=
+						TSI721_BDMA_MAX_BCOUNT) {
+				/* Adjust byte count of the descriptor */
+				desc->bcount += sg_dma_len(sg);
+				goto entry_done;
+			}
+
+			/*
+			 * Finalize this descriptor using total
+			 * byte count value.
+			 */
+			tsi721_desc_fill_end(desc);
+			dev_dbg(dchan->device->dev, "%s: desc final len: %d\n",
+				__func__, desc->bcount);
+		}
+
+		/*
+		 * Obtain and initialize a new descriptor
+		 */
 		desc = tsi721_desc_get(bdma_chan);
 		if (!desc) {
 			dev_err(dchan->device->dev,
-				"Not enough descriptors available\n");
-			goto err_desc_get;
+				"%s: Failed to get new descriptor for SG %d\n",
+				__func__, i);
+			goto err_desc_put;
 		}
 
-		if (sg_is_last(sg))
-			desc->interrupt = (flags & DMA_PREP_INTERRUPT) != 0;
-		else
-			desc->interrupt = false;
-
 		desc->destid = rext->destid;
 		desc->rio_addr = rio_addr;
 		desc->rio_addr_u = 0;
+		desc->bcount = sg_dma_len(sg);
+
+		dev_dbg(dchan->device->dev,
+			"sg%d desc: 0x%llx, addr: 0x%llx len: %d\n",
+			i, (u64)desc->txd.phys,
+			(unsigned long long)sg_dma_address(sg),
+			sg_dma_len(sg));
+
+		dev_dbg(dchan->device->dev,
+			"bd_ptr = %p did=%d raddr=0x%llx\n",
+			desc->hw_desc, desc->destid, desc->rio_addr);
 
-		err = tsi721_fill_desc(bdma_chan, desc, sg, rtype, sys_size);
+		err = tsi721_desc_fill_init(desc, sg, rtype, sys_size);
 		if (err) {
 			dev_err(dchan->device->dev,
 				"Failed to build desc: %d\n", err);
-			goto err_desc_get;
+			goto err_desc_put;
 		}
 
-		rio_addr += sg_dma_len(sg);
+		next_addr = sg_dma_address(sg);
 
 		if (!first)
 			first = desc;
 		else
 			list_add_tail(&desc->desc_node, &first->tx_list);
+
+entry_done:
+		if (sg_is_last(sg)) {
+			desc->interrupt = (flags & DMA_PREP_INTERRUPT) != 0;
+			tsi721_desc_fill_end(desc);
+			dev_dbg(dchan->device->dev, "%s: desc final len: %d\n",
+				__func__, desc->bcount);
+		} else {
+			rio_addr += sg_dma_len(sg);
+			next_addr += sg_dma_len(sg);
+		}
 	}
 
 	first->txd.cookie = -EBUSY;
@@ -741,7 +786,7 @@ struct dma_async_tx_descriptor *tsi721_prep_rio_sg(struct dma_chan *dchan,
 
 	return &first->txd;
 
-err_desc_get:
+err_desc_put:
 	tsi721_desc_put(bdma_chan, first);
 	return NULL;
 }
@@ -792,7 +837,7 @@ int tsi721_register_dma(struct tsi721_device *priv)
 		if (i == TSI721_DMACH_MAINT)
 			continue;
 
-		bdma_chan->bd_num = 64;
+		bdma_chan->bd_num = TSI721_BDMA_BD_RING_SZ;
 		bdma_chan->regs = priv->regs + TSI721_DMAC_BASE(i);
 
 		bdma_chan->dchan.device = &mport->dma;
diff --git a/drivers/rapidio/rio-driver.c b/drivers/rapidio/rio-driver.c
index c9ae692d3451..f301f059bb85 100644
--- a/drivers/rapidio/rio-driver.c
+++ b/drivers/rapidio/rio-driver.c
@@ -167,7 +167,6 @@ void rio_unregister_driver(struct rio_driver *rdrv)
 void rio_attach_device(struct rio_dev *rdev)
 {
 	rdev->dev.bus = &rio_bus_type;
-	rdev->dev.parent = &rio_bus;
 }
 EXPORT_SYMBOL_GPL(rio_attach_device);
 
@@ -216,9 +215,12 @@ static int rio_uevent(struct device *dev, struct kobj_uevent_env *env)
 	return 0;
 }
 
-struct device rio_bus = {
-	.init_name = "rapidio",
+struct class rio_mport_class = {
+	.name		= "rapidio_port",
+	.owner		= THIS_MODULE,
+	.dev_groups	= rio_mport_groups,
 };
+EXPORT_SYMBOL_GPL(rio_mport_class);
 
 struct bus_type rio_bus_type = {
 	.name = "rapidio",
@@ -233,14 +235,20 @@ struct bus_type rio_bus_type = {
 /**
  *  rio_bus_init - Register the RapidIO bus with the device model
  *
- *  Registers the RIO bus device and RIO bus type with the Linux
+ *  Registers the RIO mport device class and RIO bus type with the Linux
  *  device model.
  */
 static int __init rio_bus_init(void)
 {
-	if (device_register(&rio_bus) < 0)
-		printk("RIO: failed to register RIO bus device\n");
-	return bus_register(&rio_bus_type);
+	int ret;
+
+	ret = class_register(&rio_mport_class);
+	if (!ret) {
+		ret = bus_register(&rio_bus_type);
+		if (ret)
+			class_unregister(&rio_mport_class);
+	}
+	return ret;
 }
 
 postcore_initcall(rio_bus_init);
diff --git a/drivers/rapidio/rio-scan.c b/drivers/rapidio/rio-scan.c
index d3a6539a77cc..47a1b2ea76c4 100644
--- a/drivers/rapidio/rio-scan.c
+++ b/drivers/rapidio/rio-scan.c
@@ -461,6 +461,7 @@ static struct rio_dev *rio_setup_device(struct rio_net *net,
 			     rdev->comp_tag & RIO_CTAG_UDEVID);
 	}
 
+	rdev->dev.parent = &port->dev;
 	rio_attach_device(rdev);
 
 	device_initialize(&rdev->dev);
diff --git a/drivers/rapidio/rio-sysfs.c b/drivers/rapidio/rio-sysfs.c
index e0221c6d0cc2..cdb005c0094d 100644
--- a/drivers/rapidio/rio-sysfs.c
+++ b/drivers/rapidio/rio-sysfs.c
@@ -341,3 +341,43 @@ const struct attribute_group *rio_bus_groups[] = {
 	&rio_bus_group,
 	NULL,
 };
+
+static ssize_t
+port_destid_show(struct device *dev, struct device_attribute *attr,
+		 char *buf)
+{
+	struct rio_mport *mport = to_rio_mport(dev);
+
+	if (mport)
+		return sprintf(buf, "0x%04x\n", mport->host_deviceid);
+	else
+		return -ENODEV;
+}
+static DEVICE_ATTR_RO(port_destid);
+
+static ssize_t sys_size_show(struct device *dev, struct device_attribute *attr,
+			   char *buf)
+{
+	struct rio_mport *mport = to_rio_mport(dev);
+
+	if (mport)
+		return sprintf(buf, "%u\n", mport->sys_size);
+	else
+		return -ENODEV;
+}
+static DEVICE_ATTR_RO(sys_size);
+
+static struct attribute *rio_mport_attrs[] = {
+	&dev_attr_port_destid.attr,
+	&dev_attr_sys_size.attr,
+	NULL,
+};
+
+static const struct attribute_group rio_mport_group = {
+	.attrs = rio_mport_attrs,
+};
+
+const struct attribute_group *rio_mport_groups[] = {
+	&rio_mport_group,
+	NULL,
+};
diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c
index 2e8a20cac588..a54ba0494dd3 100644
--- a/drivers/rapidio/rio.c
+++ b/drivers/rapidio/rio.c
@@ -1884,6 +1884,7 @@ static int rio_get_hdid(int index)
 int rio_register_mport(struct rio_mport *port)
 {
 	struct rio_scan_node *scan = NULL;
+	int res = 0;
 
 	if (next_portid >= RIO_MAX_MPORTS) {
 		pr_err("RIO: reached specified max number of mports\n");
@@ -1894,6 +1895,16 @@ int rio_register_mport(struct rio_mport *port)
 	port->host_deviceid = rio_get_hdid(port->id);
 	port->nscan = NULL;
 
+	dev_set_name(&port->dev, "rapidio%d", port->id);
+	port->dev.class = &rio_mport_class;
+
+	res = device_register(&port->dev);
+	if (res)
+		dev_err(&port->dev, "RIO: mport%d registration failed ERR=%d\n",
+			port->id, res);
+	else
+		dev_dbg(&port->dev, "RIO: mport%d registered\n", port->id);
+
 	mutex_lock(&rio_mport_list_lock);
 	list_add_tail(&port->node, &rio_mports);
 
diff --git a/drivers/rapidio/rio.h b/drivers/rapidio/rio.h
index 5f99d22ad0b0..2d0550e08ea2 100644
--- a/drivers/rapidio/rio.h
+++ b/drivers/rapidio/rio.h
@@ -50,6 +50,7 @@ extern int rio_mport_scan(int mport_id);
 /* Structures internal to the RIO core code */
 extern const struct attribute_group *rio_dev_groups[];
 extern const struct attribute_group *rio_bus_groups[];
+extern const struct attribute_group *rio_mport_groups[];
 
 #define RIO_GET_DID(size, x)	(size ? (x & 0xffff) : ((x & 0x00ff0000) >> 16))
 #define RIO_SET_DID(size, x)	(size ? (x & 0xffff) : ((x & 0x000000ff) << 16))