Merge branch 'next' (accumulated 3.16 merge window patches) into master

Now that 3.15 is released, this merges the 'next' branch into 'master',
bringing us to the normal situation where my 'master' branch is the
merge window.

* accumulated work in next: (6809 commits)
  ufs: sb mutex merge + mutex_destroy
  powerpc: update comments for generic idle conversion
  cris: update comments for generic idle conversion
  idle: remove cpu_idle() forward declarations
  nbd: zero from and len fields in NBD_CMD_DISCONNECT.
  mm: convert some level-less printks to pr_*
  MAINTAINERS: adi-buildroot-devel is moderated
  MAINTAINERS: add linux-api for review of API/ABI changes
  mm/kmemleak-test.c: use pr_fmt for logging
  fs/dlm/debug_fs.c: replace seq_printf by seq_puts
  fs/dlm/lockspace.c: convert simple_str to kstr
  fs/dlm/config.c: convert simple_str to kstr
  mm: mark remap_file_pages() syscall as deprecated
  mm: memcontrol: remove unnecessary memcg argument from soft limit functions
  mm: memcontrol: clean up memcg zoneinfo lookup
  mm/memblock.c: call kmemleak directly from memblock_(alloc|free)
  mm/mempool.c: update the kmemleak stack trace for mempool allocations
  lib/radix-tree.c: update the kmemleak stack trace for radix tree allocations
  mm: introduce kmemleak_update_trace()
  mm/kmemleak.c: use %u to print ->checksum
  ...

1 files changed, 148 insertions, 70 deletions

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index bd47fbc53dc..6c48d73a7fd 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -51,10 +51,6 @@ struct platform_device *of_find_device_by_node(struct device_node *np)
 }
 EXPORT_SYMBOL(of_find_device_by_node);
 
-#if defined(CONFIG_PPC_DCR)
-#include <asm/dcr.h>
-#endif
-
 #ifdef CONFIG_OF_ADDRESS
 /*
  * The following routines scan a subtree and registers a device for
@@ -68,66 +64,35 @@ EXPORT_SYMBOL(of_find_device_by_node);
  * of_device_make_bus_id - Use the device node data to assign a unique name
  * @dev: pointer to device structure that is linked to a device tree node
  *
- * This routine will first try using either the dcr-reg or the reg property
- * value to derive a unique name.  As a last resort it will use the node
- * name followed by a unique number.
+ * This routine will first try using the translated bus address to
+ * derive a unique name. If it cannot, then it will prepend names from
+ * parent nodes until a unique name can be derived.
  */
 void of_device_make_bus_id(struct device *dev)
 {
-	static atomic_t bus_no_reg_magic;
 	struct device_node *node = dev->of_node;
 	const __be32 *reg;
 	u64 addr;
-	const __be32 *addrp;
-	int magic;
 
-#ifdef CONFIG_PPC_DCR
-	/*
-	 * If it's a DCR based device, use 'd' for native DCRs
-	 * and 'D' for MMIO DCRs.
-	 */
-	reg = of_get_property(node, "dcr-reg", NULL);
-	if (reg) {
-#ifdef CONFIG_PPC_DCR_NATIVE
-		dev_set_name(dev, "d%x.%s", *reg, node->name);
-#else /* CONFIG_PPC_DCR_NATIVE */
-		u64 addr = of_translate_dcr_address(node, *reg, NULL);
-		if (addr != OF_BAD_ADDR) {
-			dev_set_name(dev, "D%llx.%s",
-				     (unsigned long long)addr, node->name);
+	/* Construct the name, using parent nodes if necessary to ensure uniqueness */
+	while (node->parent) {
+		/*
+		 * If the address can be translated, then that is as much
+		 * uniqueness as we need. Make it the first component and return
+		 */
+		reg = of_get_property(node, "reg", NULL);
+		if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) {
+			dev_set_name(dev, dev_name(dev) ? "%llx.%s:%s" : "%llx.%s",
+				     (unsigned long long)addr, node->name,
+				     dev_name(dev));
 			return;
 		}
-#endif /* !CONFIG_PPC_DCR_NATIVE */
-	}
-#endif /* CONFIG_PPC_DCR */
 
-	/*
-	 * For MMIO, get the physical address
-	 */
-	reg = of_get_property(node, "reg", NULL);
-	if (reg) {
-		if (of_can_translate_address(node)) {
-			addr = of_translate_address(node, reg);
-		} else {
-			addrp = of_get_address(node, 0, NULL, NULL);
-			if (addrp)
-				addr = of_read_number(addrp, 1);
-			else
-				addr = OF_BAD_ADDR;
-		}
-		if (addr != OF_BAD_ADDR) {
-			dev_set_name(dev, "%llx.%s",
-				     (unsigned long long)addr, node->name);
-			return;
-		}
+		/* format arguments only used if dev_name() resolves to NULL */
+		dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s",
+			     strrchr(node->full_name, '/') + 1, dev_name(dev));
+		node = node->parent;
 	}
-
-	/*
-	 * No BusID, use the node name and add a globally incremented
-	 * counter (and pray...)
-	 */
-	magic = atomic_add_return(1, &bus_no_reg_magic);
-	dev_set_name(dev, "%s.%d", node->name, magic - 1);
 }
 
 /**
@@ -149,9 +114,8 @@ struct platform_device *of_device_alloc(struct device_node *np,
 		return NULL;
 
 	/* count the io and irq resources */
-	if (of_can_translate_address(np))
-		while (of_address_to_resource(np, num_reg, &temp_res) == 0)
-			num_reg++;
+	while (of_address_to_resource(np, num_reg, &temp_res) == 0)
+		num_reg++;
 	num_irq = of_irq_count(np);
 
 	/* Populate the resource table */
@@ -174,9 +138,6 @@ struct platform_device *of_device_alloc(struct device_node *np,
 	}
 
 	dev->dev.of_node = of_node_get(np);
-#if defined(CONFIG_MICROBLAZE)
-	dev->dev.dma_mask = &dev->archdata.dma_mask;
-#endif
 	dev->dev.parent = parent;
 
 	if (bus_id)
@@ -189,6 +150,64 @@ struct platform_device *of_device_alloc(struct device_node *np,
 EXPORT_SYMBOL(of_device_alloc);
 
 /**
+ * of_dma_configure - Setup DMA configuration
+ * @dev:	Device to apply DMA configuration
+ *
+ * Try to get devices's DMA configuration from DT and update it
+ * accordingly.
+ *
+ * In case if platform code need to use own special DMA configuration,it
+ * can use Platform bus notifier and handle BUS_NOTIFY_ADD_DEVICE event
+ * to fix up DMA configuration.
+ */
+static void of_dma_configure(struct platform_device *pdev)
+{
+	u64 dma_addr, paddr, size;
+	int ret;
+	struct device *dev = &pdev->dev;
+
+#if defined(CONFIG_MICROBLAZE)
+	pdev->archdata.dma_mask = 0xffffffffUL;
+#endif
+
+	/*
+	 * Set default dma-mask to 32 bit. Drivers are expected to setup
+	 * the correct supported dma_mask.
+	 */
+	dev->coherent_dma_mask = DMA_BIT_MASK(32);
+
+	/*
+	 * Set it to coherent_dma_mask by default if the architecture
+	 * code has not set it.
+	 */
+	if (!dev->dma_mask)
+		dev->dma_mask = &dev->coherent_dma_mask;
+
+	/*
+	 * if dma-coherent property exist, call arch hook to setup
+	 * dma coherent operations.
+	 */
+	if (of_dma_is_coherent(dev->of_node)) {
+		set_arch_dma_coherent_ops(dev);
+		dev_dbg(dev, "device is dma coherent\n");
+	}
+
+	/*
+	 * if dma-ranges property doesn't exist - just return else
+	 * setup the dma offset
+	 */
+	ret = of_dma_get_range(dev->of_node, &dma_addr, &paddr, &size);
+	if (ret < 0) {
+		dev_dbg(dev, "no dma range information to setup\n");
+		return;
+	}
+
+	/* DMA ranges found. Calculate and set dma_pfn_offset */
+	dev->dma_pfn_offset = PFN_DOWN(paddr - dma_addr);
+	dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", dev->dma_pfn_offset);
+}
+
+/**
  * of_platform_device_create_pdata - Alloc, initialize and register an of_device
  * @np: pointer to node to create device for
  * @bus_id: name to assign device
@@ -206,19 +225,15 @@ static struct platform_device *of_platform_device_create_pdata(
 {
 	struct platform_device *dev;
 
-	if (!of_device_is_available(np))
+	if (!of_device_is_available(np) ||
+	    of_node_test_and_set_flag(np, OF_POPULATED))
 		return NULL;
 
 	dev = of_device_alloc(np, bus_id, parent);
 	if (!dev)
-		return NULL;
+		goto err_clear_flag;
 
-#if defined(CONFIG_MICROBLAZE)
-	dev->archdata.dma_mask = 0xffffffffUL;
-#endif
-	dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
-	if (!dev->dev.dma_mask)
-		dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
+	of_dma_configure(dev);
 	dev->dev.bus = &platform_bus_type;
 	dev->dev.platform_data = platform_data;
 
@@ -229,10 +244,14 @@ static struct platform_device *of_platform_device_create_pdata(
 
 	if (of_device_add(dev) != 0) {
 		platform_device_put(dev);
-		return NULL;
+		goto err_clear_flag;
 	}
 
 	return dev;
+
+err_clear_flag:
+	of_node_clear_flag(np, OF_POPULATED);
+	return NULL;
 }
 
 /**
@@ -264,14 +283,15 @@ static struct amba_device *of_amba_device_create(struct device_node *node,
 
 	pr_debug("Creating amba device %s\n", node->full_name);
 
-	if (!of_device_is_available(node))
+	if (!of_device_is_available(node) ||
+	    of_node_test_and_set_flag(node, OF_POPULATED))
 		return NULL;
 
 	dev = amba_device_alloc(NULL, 0, 0);
 	if (!dev) {
 		pr_err("%s(): amba_device_alloc() failed for %s\n",
 		       __func__, node->full_name);
-		return NULL;
+		goto err_clear_flag;
 	}
 
 	/* setup generic device info */
@@ -311,6 +331,8 @@ static struct amba_device *of_amba_device_create(struct device_node *node,
 
 err_free:
 	amba_device_put(dev);
+err_clear_flag:
+	of_node_clear_flag(node, OF_POPULATED);
 	return NULL;
 }
 #else /* CONFIG_ARM_AMBA */
@@ -487,4 +509,60 @@ int of_platform_populate(struct device_node *root,
 	return rc;
 }
 EXPORT_SYMBOL_GPL(of_platform_populate);
+
+static int of_platform_device_destroy(struct device *dev, void *data)
+{
+	bool *children_left = data;
+
+	/* Do not touch devices not populated from the device tree */
+	if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED)) {
+		*children_left = true;
+		return 0;
+	}
+
+	/* Recurse, but don't touch this device if it has any children left */
+	if (of_platform_depopulate(dev) != 0) {
+		*children_left = true;
+		return 0;
+	}
+
+	if (dev->bus == &platform_bus_type)
+		platform_device_unregister(to_platform_device(dev));
+#ifdef CONFIG_ARM_AMBA
+	else if (dev->bus == &amba_bustype)
+		amba_device_unregister(to_amba_device(dev));
+#endif
+	else {
+		*children_left = true;
+		return 0;
+	}
+
+	of_node_clear_flag(dev->of_node, OF_POPULATED);
+
+	return 0;
+}
+
+/**
+ * of_platform_depopulate() - Remove devices populated from device tree
+ * @parent: device which childred will be removed
+ *
+ * Complementary to of_platform_populate(), this function removes children
+ * of the given device (and, recurrently, their children) that have been
+ * created from their respective device tree nodes (and only those,
+ * leaving others - eg. manually created - unharmed).
+ *
+ * Returns 0 when all children devices have been removed or
+ * -EBUSY when some children remained.
+ */
+int of_platform_depopulate(struct device *parent)
+{
+	bool children_left = false;
+
+	device_for_each_child(parent, &children_left,
+			      of_platform_device_destroy);
+
+	return children_left ? -EBUSY : 0;
+}
+EXPORT_SYMBOL_GPL(of_platform_depopulate);
+
 #endif /* CONFIG_OF_ADDRESS */