[RFC Patch 17/19] resources: Move struct resource_list_entry from ACPI into resource core

[Jiang Liu]

Currently ACPI, PCI and pnp all implement the same resource list
management with different data structure. We need to transfer from
one data structure into another when passing resources from one
subsystem into another subsystem. Sp move struct resource_list_entry
from ACPI into resource core, so it could be reused by different
subystems and avoid the data structure conversion.

Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
---
 drivers/acpi/acpi_lpss.c     |    6 +++---
 drivers/acpi/acpi_platform.c |    2 +-
 drivers/acpi/resource.c      |   13 ++++--------
 drivers/dma/acpi-dma.c       |    8 +++----
 include/linux/acpi.h         |    6 ------
 include/linux/ioport.h       |   25 ++++++++++++++++++++++
 kernel/resource.c            |   48 ++++++++++++++++++++++++++++++++++++++++++
 7 files changed, 85 insertions(+), 23 deletions(-)

diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
index 4f3febf8a589..39b548dba70b 100644
--- a/drivers/acpi/acpi_lpss.c
+++ b/drivers/acpi/acpi_lpss.c
@@ -333,12 +333,12 @@ static int acpi_lpss_create_device(struct acpi_device *adev,
 		goto err_out;
 
 	list_for_each_entry(rentry, &resource_list, node)
-		if (resource_type(&rentry->res) == IORESOURCE_MEM) {
+		if (resource_type(rentry->res) == IORESOURCE_MEM) {
 			if (dev_desc->prv_size_override)
 				pdata->mmio_size = dev_desc->prv_size_override;
 			else
-				pdata->mmio_size = resource_size(&rentry->res);
-			pdata->mmio_base = ioremap(rentry->res.start,
+				pdata->mmio_size = resource_size(rentry->res);
+			pdata->mmio_base = ioremap(rentry->res->start,
 						   pdata->mmio_size);
 			break;
 		}
diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c
index 6ba8beb6b9d2..238e32b9cbb0 100644
--- a/drivers/acpi/acpi_platform.c
+++ b/drivers/acpi/acpi_platform.c
@@ -71,7 +71,7 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
 		}
 		count = 0;
 		list_for_each_entry(rentry, &resource_list, node)
-			resources[count++] = rentry->res;
+			resources[count++] = *rentry->res;
 
 		acpi_dev_free_resource_list(&resource_list);
 	}
diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index 8ea7c26d6915..c0dc038274d4 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -444,12 +444,7 @@ EXPORT_SYMBOL_GPL(acpi_dev_resource_interrupt);
  */
 void acpi_dev_free_resource_list(struct list_head *list)
 {
-	struct resource_list_entry *rentry, *re;
-
-	list_for_each_entry_safe(rentry, re, list, node) {
-		list_del(&rentry->node);
-		kfree(rentry);
-	}
+	resource_list_free_list(list);
 }
 EXPORT_SYMBOL_GPL(acpi_dev_free_resource_list);
 
@@ -467,14 +462,14 @@ static acpi_status acpi_dev_new_resource_entry(struct resource *r,
 {
 	struct resource_list_entry *rentry;
 
-	rentry = kmalloc(sizeof(*rentry), GFP_KERNEL);
+	rentry = resource_list_alloc(NULL, 0);
 	if (!rentry) {
 		c->error = -ENOMEM;
 		return AE_NO_MEMORY;
 	}
-	rentry->res = *r;
+	*rentry->res = *r;
 	rentry->offset = offset;
-	list_add_tail(&rentry->node, c->list);
+	resource_list_insert(c->list, rentry, true);
 	c->count++;
 	return AE_OK;
 }
diff --git a/drivers/dma/acpi-dma.c b/drivers/dma/acpi-dma.c
index de361a156b34..1ce84abe0924 100644
--- a/drivers/dma/acpi-dma.c
+++ b/drivers/dma/acpi-dma.c
@@ -56,10 +56,10 @@ static int acpi_dma_parse_resource_group(const struct acpi_csrt_group *grp,
 		return 0;
 
 	list_for_each_entry(rentry, &resource_list, node) {
-		if (resource_type(&rentry->res) == IORESOURCE_MEM)
-			mem = rentry->res.start;
-		else if (resource_type(&rentry->res) == IORESOURCE_IRQ)
-			irq = rentry->res.start;
+		if (resource_type(rentry->res) == IORESOURCE_MEM)
+			mem = rentry->res->start;
+		else if (resource_type(rentry->res) == IORESOURCE_IRQ)
+			irq = rentry->res->start;
 	}
 
 	acpi_dev_free_resource_list(&resource_list);
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 1df4a0211ae5..6d7f7edca22c 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -297,12 +297,6 @@ unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable);
 bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
 				 struct resource *res);
 
-struct resource_list_entry {
-	struct list_head node;
-	struct resource res;
-	resource_size_t offset;
-};
-
 void acpi_dev_free_resource_list(struct list_head *list);
 int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list,
 			   int (*preproc)(struct acpi_resource *, void *),
diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 2c5250222278..a6f4841ca40c 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -11,6 +11,7 @@
 #ifndef __ASSEMBLY__
 #include <linux/compiler.h>
 #include <linux/types.h>
+
 /*
  * Resources are tree-like, allowing
  * nesting etc..
@@ -255,6 +256,30 @@ static inline bool resource_overlaps(struct resource *r1, struct resource *r2)
        return (r1->start <= r2->end && r1->end >= r2->start);
 }
 
+/*
+ * Common resource list management data structure and interfaces to support
+ * ACPI, PNP and PCI host bridge etc.
+ */
+struct resource_list_entry {
+	struct list_head	node;
+	struct resource		*res;	/* In master (CPU) address space */
+	resource_size_t		offset;	/* Translation offset for bridge */
+	struct resource		__res;	/* Default storage for res */
+};
+
+extern struct resource_list_entry *resource_list_alloc(struct resource *res,
+						       size_t extra_size);
+extern void resource_list_free(struct resource_list_entry *entry);
+extern void resource_list_insert(struct list_head *head,
+				 struct resource_list_entry *entry, bool tail);
+extern void resource_list_delete(struct resource_list_entry *entry);
+extern void resource_list_free_list(struct list_head *head);
+
+#define resource_list_for_each_entry(entry, list)	\
+	list_for_each_entry((entry), (list), node)
+
+#define resource_list_for_each_entry_safe(entry, tmp, list)	\
+	list_for_each_entry_safe((entry), (tmp), (list), node)
 
 #endif /* __ASSEMBLY__ */
 #endif	/* _LINUX_IOPORT_H */
diff --git a/kernel/resource.c b/kernel/resource.c
index 0bcebffc4e77..414183809383 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -1529,6 +1529,54 @@ int iomem_is_exclusive(u64 addr)
 	return err;
 }
 
+struct resource_list_entry *resource_list_alloc(struct resource *res,
+						size_t extra_size)
+{
+	struct resource_list_entry *entry;
+
+	entry = kzalloc(sizeof(*entry) + extra_size, GFP_KERNEL);
+	if (entry) {
+		INIT_LIST_HEAD(&entry->node);
+		entry->res = res ? res : &entry->__res;
+	}
+
+	return entry;
+}
+EXPORT_SYMBOL(resource_list_alloc);
+
+void resource_list_free(struct resource_list_entry *entry)
+{
+	kfree(entry);
+}
+EXPORT_SYMBOL(resource_list_free);
+
+void resource_list_insert(struct list_head *head,
+			  struct resource_list_entry *entry, bool tail)
+{
+	if (tail)
+		list_add_tail(&entry->node, head);
+	else
+		list_add(&entry->node, head);
+}
+EXPORT_SYMBOL(resource_list_insert);
+
+void resource_list_delete(struct resource_list_entry *entry)
+{
+	list_del(&entry->node);
+}
+EXPORT_SYMBOL(resource_list_delete);
+
+void resource_list_free_list(struct list_head *head)
+{
+	struct resource_list_entry *entry, *tmp;
+
+	list_for_each_entry_safe(entry, tmp, head, node) {
+		list_del(&entry->node);
+		resource_list_free(entry);
+	}
+}
+EXPORT_SYMBOL(resource_list_free_list);
+
 static int __init strict_iomem(char *str)
 {
 	if (strstr(str, "relaxed"))
-- 
1.7.10.4

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