* Arbitrary resource management.
*/
-#include <linux/config.h>
#include <linux/module.h>
-#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
+#include <linux/device.h>
#include <asm/io.h>
struct resource ioport_resource = {
.name = "PCI IO",
- .start = 0x0000,
+ .start = 0,
.end = IO_SPACE_LIMIT,
.flags = IORESOURCE_IO,
};
-
EXPORT_SYMBOL(ioport_resource);
struct resource iomem_resource = {
.name = "PCI mem",
- .start = 0UL,
- .end = ~0UL,
+ .start = 0,
+ .end = -1,
.flags = IORESOURCE_MEM,
};
-
EXPORT_SYMBOL(iomem_resource);
static DEFINE_RWLOCK(resource_lock);
return 0;
}
-static struct seq_operations resource_op = {
+static const struct seq_operations resource_op = {
.start = r_start,
.next = r_next,
.stop = r_stop,
return res;
}
-static struct file_operations proc_ioports_operations = {
+static const struct file_operations proc_ioports_operations = {
.open = ioports_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
-static struct file_operations proc_iomem_operations = {
+static const struct file_operations proc_iomem_operations = {
.open = iomem_open,
.read = seq_read,
.llseek = seq_lseek,
/* Return the conflict entry if you can't request it */
static struct resource * __request_resource(struct resource *root, struct resource *new)
{
- unsigned long start = new->start;
- unsigned long end = new->end;
+ resource_size_t start = new->start;
+ resource_size_t end = new->end;
struct resource *tmp, **p;
if (end < start)
return -EINVAL;
}
+/**
+ * request_resource - request and reserve an I/O or memory resource
+ * @root: root resource descriptor
+ * @new: resource descriptor desired by caller
+ *
+ * Returns 0 for success, negative error code on error.
+ */
int request_resource(struct resource *root, struct resource *new)
{
struct resource *conflict;
EXPORT_SYMBOL(request_resource);
-struct resource *____request_resource(struct resource *root, struct resource *new)
-{
- struct resource *conflict;
-
- write_lock(&resource_lock);
- conflict = __request_resource(root, new);
- write_unlock(&resource_lock);
- return conflict;
-}
-
-EXPORT_SYMBOL(____request_resource);
-
+/**
+ * release_resource - release a previously reserved resource
+ * @old: resource pointer
+ */
int release_resource(struct resource *old)
{
int retval;
EXPORT_SYMBOL(release_resource);
+#ifdef CONFIG_MEMORY_HOTPLUG
+/*
+ * Finds the lowest memory reosurce exists within [res->start.res->end)
+ * the caller must specify res->start, res->end, res->flags.
+ * If found, returns 0, res is overwritten, if not found, returns -1.
+ */
+int find_next_system_ram(struct resource *res)
+{
+ resource_size_t start, end;
+ struct resource *p;
+
+ BUG_ON(!res);
+
+ start = res->start;
+ end = res->end;
+ BUG_ON(start >= end);
+
+ read_lock(&resource_lock);
+ for (p = iomem_resource.child; p ; p = p->sibling) {
+ /* system ram is just marked as IORESOURCE_MEM */
+ if (p->flags != res->flags)
+ continue;
+ if (p->start > end) {
+ p = NULL;
+ break;
+ }
+ if ((p->end >= start) && (p->start < end))
+ break;
+ }
+ read_unlock(&resource_lock);
+ if (!p)
+ return -1;
+ /* copy data */
+ if (res->start < p->start)
+ res->start = p->start;
+ if (res->end > p->end)
+ res->end = p->end;
+ return 0;
+}
+#endif
+
/*
* Find empty slot in the resource tree given range and alignment.
*/
static int find_resource(struct resource *root, struct resource *new,
- unsigned long size,
- unsigned long min, unsigned long max,
- unsigned long align,
+ resource_size_t size, resource_size_t min,
+ resource_size_t max, resource_size_t align,
void (*alignf)(void *, struct resource *,
- unsigned long, unsigned long),
+ resource_size_t, resource_size_t),
void *alignf_data)
{
struct resource *this = root->child;
return -EBUSY;
}
-/*
- * Allocate empty slot in the resource tree given range and alignment.
+/**
+ * allocate_resource - allocate empty slot in the resource tree given range & alignment
+ * @root: root resource descriptor
+ * @new: resource descriptor desired by caller
+ * @size: requested resource region size
+ * @min: minimum size to allocate
+ * @max: maximum size to allocate
+ * @align: alignment requested, in bytes
+ * @alignf: alignment function, optional, called if not NULL
+ * @alignf_data: arbitrary data to pass to the @alignf function
*/
int allocate_resource(struct resource *root, struct resource *new,
- unsigned long size,
- unsigned long min, unsigned long max,
- unsigned long align,
+ resource_size_t size, resource_size_t min,
+ resource_size_t max, resource_size_t align,
void (*alignf)(void *, struct resource *,
- unsigned long, unsigned long),
+ resource_size_t, resource_size_t),
void *alignf_data)
{
int err;
*
* Returns 0 on success, -EBUSY if the resource can't be inserted.
*
- * This function is equivalent of request_resource when no conflict
+ * This function is equivalent to request_resource when no conflict
* happens. If a conflict happens, and the conflicting resources
* entirely fit within the range of the new resource, then the new
- * resource is inserted and the conflicting resources become childs of
- * the new resource. Otherwise the new resource becomes the child of
- * the conflicting resource
+ * resource is inserted and the conflicting resources become children of
+ * the new resource.
*/
int insert_resource(struct resource *parent, struct resource *new)
{
struct resource *first, *next;
write_lock(&resource_lock);
- begin:
- result = 0;
- first = __request_resource(parent, new);
- if (!first)
- goto out;
- result = -EBUSY;
- if (first == parent)
- goto out;
+ for (;; parent = first) {
+ result = 0;
+ first = __request_resource(parent, new);
+ if (!first)
+ goto out;
+
+ result = -EBUSY;
+ if (first == parent)
+ goto out;
- /* Resource fully contained by the clashing resource? Recurse into it */
- if (first->start <= new->start && first->end >= new->end) {
- parent = first;
- goto begin;
+ if ((first->start > new->start) || (first->end < new->end))
+ break;
+ if ((first->start == new->start) && (first->end == new->end))
+ break;
}
for (next = first; ; next = next->sibling) {
return result;
}
-EXPORT_SYMBOL(insert_resource);
-
-/*
+/**
+ * adjust_resource - modify a resource's start and size
+ * @res: resource to modify
+ * @start: new start value
+ * @size: new size
+ *
* Given an existing resource, change its start and size to match the
- * arguments. Returns -EBUSY if it can't fit. Existing children of
- * the resource are assumed to be immutable.
+ * arguments. Returns 0 on success, -EBUSY if it can't fit.
+ * Existing children of the resource are assumed to be immutable.
*/
-int adjust_resource(struct resource *res, unsigned long start, unsigned long size)
+int adjust_resource(struct resource *res, resource_size_t start, resource_size_t size)
{
struct resource *tmp, *parent = res->parent;
- unsigned long end = start + size - 1;
+ resource_size_t end = start + size - 1;
int result = -EBUSY;
write_lock(&resource_lock);
* Note how this, unlike the above, knows about
* the IO flag meanings (busy etc).
*
- * Request-region creates a new busy region.
+ * request_region creates a new busy region.
*
- * Check-region returns non-zero if the area is already busy
+ * check_region returns non-zero if the area is already busy.
*
- * Release-region releases a matching busy region.
+ * release_region releases a matching busy region.
*/
-struct resource * __request_region(struct resource *parent, unsigned long start, unsigned long n, const char *name)
+
+/**
+ * __request_region - create a new busy resource region
+ * @parent: parent resource descriptor
+ * @start: resource start address
+ * @n: resource region size
+ * @name: reserving caller's ID string
+ */
+struct resource * __request_region(struct resource *parent,
+ resource_size_t start, resource_size_t n,
+ const char *name)
{
struct resource *res = kzalloc(sizeof(*res), GFP_KERNEL);
}
return res;
}
-
EXPORT_SYMBOL(__request_region);
-int __check_region(struct resource *parent, unsigned long start, unsigned long n)
+/**
+ * __check_region - check if a resource region is busy or free
+ * @parent: parent resource descriptor
+ * @start: resource start address
+ * @n: resource region size
+ *
+ * Returns 0 if the region is free at the moment it is checked,
+ * returns %-EBUSY if the region is busy.
+ *
+ * NOTE:
+ * This function is deprecated because its use is racy.
+ * Even if it returns 0, a subsequent call to request_region()
+ * may fail because another driver etc. just allocated the region.
+ * Do NOT use it. It will be removed from the kernel.
+ */
+int __check_region(struct resource *parent, resource_size_t start,
+ resource_size_t n)
{
struct resource * res;
kfree(res);
return 0;
}
-
EXPORT_SYMBOL(__check_region);
-void __release_region(struct resource *parent, unsigned long start, unsigned long n)
+/**
+ * __release_region - release a previously reserved resource region
+ * @parent: parent resource descriptor
+ * @start: resource start address
+ * @n: resource region size
+ *
+ * The described resource region must match a currently busy region.
+ */
+void __release_region(struct resource *parent, resource_size_t start,
+ resource_size_t n)
{
struct resource **p;
- unsigned long end;
+ resource_size_t end;
p = &parent->child;
end = start + n - 1;
"<%016llx-%016llx>\n", (unsigned long long)start,
(unsigned long long)end);
}
-
EXPORT_SYMBOL(__release_region);
/*
+ * Managed region resource
+ */
+struct region_devres {
+ struct resource *parent;
+ resource_size_t start;
+ resource_size_t n;
+};
+
+static void devm_region_release(struct device *dev, void *res)
+{
+ struct region_devres *this = res;
+
+ __release_region(this->parent, this->start, this->n);
+}
+
+static int devm_region_match(struct device *dev, void *res, void *match_data)
+{
+ struct region_devres *this = res, *match = match_data;
+
+ return this->parent == match->parent &&
+ this->start == match->start && this->n == match->n;
+}
+
+struct resource * __devm_request_region(struct device *dev,
+ struct resource *parent, resource_size_t start,
+ resource_size_t n, const char *name)
+{
+ struct region_devres *dr = NULL;
+ struct resource *res;
+
+ dr = devres_alloc(devm_region_release, sizeof(struct region_devres),
+ GFP_KERNEL);
+ if (!dr)
+ return NULL;
+
+ dr->parent = parent;
+ dr->start = start;
+ dr->n = n;
+
+ res = __request_region(parent, start, n, name);
+ if (res)
+ devres_add(dev, dr);
+ else
+ devres_free(dr);
+
+ return res;
+}
+EXPORT_SYMBOL(__devm_request_region);
+
+void __devm_release_region(struct device *dev, struct resource *parent,
+ resource_size_t start, resource_size_t n)
+{
+ struct region_devres match_data = { parent, start, n };
+
+ __release_region(parent, start, n);
+ WARN_ON(devres_destroy(dev, devm_region_release, devm_region_match,
+ &match_data));
+}
+EXPORT_SYMBOL(__devm_release_region);
+
+/*
* Called from init/main.c to reserve IO ports.
*/
#define MAXRESERVE 4
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff