summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat
-rw-r--r--drivers/acpi/acpi_platform.c94
-rw-r--r--drivers/acpi/resource.c134
-rw-r--r--include/linux/acpi.h10
3 files changed, 161 insertions, 77 deletions
diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c
index bcbb00ce6d99..7ac20d8b8f07 100644
--- a/drivers/acpi/acpi_platform.c
+++ b/drivers/acpi/acpi_platform.c
@@ -19,61 +19,6 @@
ACPI_MODULE_NAME("platform");
-struct resource_info {
- struct device *dev;
- struct resource *res;
- size_t n, cur;
-};
-
-static acpi_status acpi_platform_count_resources(struct acpi_resource *res,
- void *data)
-{
- struct acpi_resource_extended_irq *acpi_xirq;
- struct acpi_resource_irq *acpi_irq;
- struct resource_info *ri = data;
-
- switch (res->type) {
- case ACPI_RESOURCE_TYPE_IRQ:
- acpi_irq = &res->data.irq;
- ri->n += acpi_irq->interrupt_count;
- break;
- case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
- acpi_xirq = &res->data.extended_irq;
- ri->n += acpi_xirq->interrupt_count;
- break;
- default:
- ri->n++;
- }
-
- return AE_OK;
-}
-
-static acpi_status acpi_platform_add_resources(struct acpi_resource *res,
- void *data)
-{
- struct resource_info *ri = data;
- struct resource *r;
-
- r = ri->res + ri->cur;
- if (acpi_dev_resource_memory(res, r)
- || acpi_dev_resource_io(res, r)
- || acpi_dev_resource_address_space(res, r)
- || acpi_dev_resource_ext_address_space(res, r)) {
- ri->cur++;
- return AE_OK;
- }
- if (acpi_dev_resource_interrupt(res, 0, r)) {
- int i;
-
- r++;
- for (i = 1; acpi_dev_resource_interrupt(res, i, r); i++)
- r++;
-
- ri->cur += i;
- }
- return AE_OK;
-}
-
/**
* acpi_create_platform_device - Create platform device for ACPI device node
* @adev: ACPI device node to create a platform device for.
@@ -89,35 +34,31 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
struct platform_device *pdev = NULL;
struct acpi_device *acpi_parent;
struct device *parent = NULL;
- struct resource_info ri;
- acpi_status status;
+ struct resource_list_entry *rentry;
+ struct list_head resource_list;
+ struct resource *resources;
+ int count;
/* If the ACPI node already has a physical device attached, skip it. */
if (adev->physical_node_count)
return NULL;
- memset(&ri, 0, sizeof(ri));
- /* First, count the resources. */
- status = acpi_walk_resources(adev->handle, METHOD_NAME__CRS,
- acpi_platform_count_resources, &ri);
- if (ACPI_FAILURE(status) || !ri.n)
+ INIT_LIST_HEAD(&resource_list);
+ count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
+ if (count <= 0)
return NULL;
- /* Next, allocate memory for all the resources and populate it. */
- ri.dev = &adev->dev;
- ri.res = kzalloc(ri.n * sizeof(struct resource), GFP_KERNEL);
- if (!ri.res) {
- dev_err(&adev->dev,
- "failed to allocate memory for resources\n");
+ resources = kmalloc(count * sizeof(struct resource), GFP_KERNEL);
+ if (!resources) {
+ dev_err(&adev->dev, "No memory for resources\n");
+ acpi_dev_free_resource_list(&resource_list);
return NULL;
}
+ count = 0;
+ list_for_each_entry(rentry, &resource_list, node)
+ resources[count++] = rentry->res;
- status = acpi_walk_resources(adev->handle, METHOD_NAME__CRS,
- acpi_platform_add_resources, &ri);
- if (ACPI_FAILURE(status)) {
- dev_err(&adev->dev, "failed to walk resources\n");
- goto out;
- }
+ acpi_dev_free_resource_list(&resource_list);
/*
* If the ACPI node has a parent and that parent has a physical device
@@ -140,7 +81,7 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
mutex_unlock(&acpi_parent->physical_node_lock);
}
pdev = platform_device_register_resndata(parent, dev_name(&adev->dev),
- -1, ri.res, ri.cur, NULL, 0);
+ -1, resources, count, NULL, 0);
if (IS_ERR(pdev)) {
dev_err(&adev->dev, "platform device creation failed: %ld\n",
PTR_ERR(pdev));
@@ -150,8 +91,7 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
dev_name(&pdev->dev));
}
- out:
- kfree(ri.res);
+ kfree(resources);
return pdev;
}
diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index 3e7fd349e29d..2bafc25482b3 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -26,6 +26,7 @@
#include <linux/device.h>
#include <linux/export.h>
#include <linux/ioport.h>
+#include <linux/slab.h>
#ifdef CONFIG_X86
#define valid_IRQ(i) (((i) != 0) && ((i) != 2))
@@ -391,3 +392,136 @@ bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
return true;
}
EXPORT_SYMBOL_GPL(acpi_dev_resource_interrupt);
+
+/**
+ * acpi_dev_free_resource_list - Free resource from %acpi_dev_get_resources().
+ * @list: The head of the resource list to free.
+ */
+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);
+ }
+}
+EXPORT_SYMBOL_GPL(acpi_dev_free_resource_list);
+
+struct res_proc_context {
+ struct list_head *list;
+ int (*preproc)(struct acpi_resource *, void *);
+ void *preproc_data;
+ int count;
+ int error;
+};
+
+static acpi_status acpi_dev_new_resource_entry(struct resource *r,
+ struct res_proc_context *c)
+{
+ struct resource_list_entry *rentry;
+
+ rentry = kmalloc(sizeof(*rentry), GFP_KERNEL);
+ if (!rentry) {
+ c->error = -ENOMEM;
+ return AE_NO_MEMORY;
+ }
+ INIT_LIST_HEAD(&rentry->node);
+ rentry->res = *r;
+ list_add_tail(&rentry->node, c->list);
+ c->count++;
+ return AE_OK;
+}
+
+static acpi_status acpi_dev_process_resource(struct acpi_resource *ares,
+ void *context)
+{
+ struct res_proc_context *c = context;
+ struct resource r;
+ int i;
+
+ if (c->preproc) {
+ int ret;
+
+ ret = c->preproc(ares, c->preproc_data);
+ if (ret < 0) {
+ c->error = ret;
+ return AE_ABORT_METHOD;
+ } else if (ret > 0) {
+ return AE_OK;
+ }
+ }
+
+ memset(&r, 0, sizeof(r));
+
+ if (acpi_dev_resource_memory(ares, &r)
+ || acpi_dev_resource_io(ares, &r)
+ || acpi_dev_resource_address_space(ares, &r)
+ || acpi_dev_resource_ext_address_space(ares, &r))
+ return acpi_dev_new_resource_entry(&r, c);
+
+ for (i = 0; acpi_dev_resource_interrupt(ares, i, &r); i++) {
+ acpi_status status;
+
+ status = acpi_dev_new_resource_entry(&r, c);
+ if (ACPI_FAILURE(status))
+ return status;
+ }
+
+ return AE_OK;
+}
+
+/**
+ * acpi_dev_get_resources - Get current resources of a device.
+ * @adev: ACPI device node to get the resources for.
+ * @list: Head of the resultant list of resources (must be empty).
+ * @preproc: The caller's preprocessing routine.
+ * @preproc_data: Pointer passed to the caller's preprocessing routine.
+ *
+ * Evaluate the _CRS method for the given device node and process its output by
+ * (1) executing the @preproc() rountine provided by the caller, passing the
+ * resource pointer and @preproc_data to it as arguments, for each ACPI resource
+ * returned and (2) converting all of the returned ACPI resources into struct
+ * resource objects if possible. If the return value of @preproc() in step (1)
+ * is different from 0, step (2) is not applied to the given ACPI resource and
+ * if that value is negative, the whole processing is aborted and that value is
+ * returned as the final error code.
+ *
+ * The resultant struct resource objects are put on the list pointed to by
+ * @list, that must be empty initially, as members of struct resource_list_entry
+ * objects. Callers of this routine should use %acpi_dev_free_resource_list() to
+ * free that list.
+ *
+ * The number of resources in the output list is returned on success, an error
+ * code reflecting the error condition is returned otherwise.
+ */
+int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list,
+ int (*preproc)(struct acpi_resource *, void *),
+ void *preproc_data)
+{
+ struct res_proc_context c;
+ acpi_handle not_used;
+ acpi_status status;
+
+ if (!adev || !adev->handle || !list_empty(list))
+ return -EINVAL;
+
+ status = acpi_get_handle(adev->handle, METHOD_NAME__CRS, &not_used);
+ if (ACPI_FAILURE(status))
+ return 0;
+
+ c.list = list;
+ c.preproc = preproc;
+ c.preproc_data = preproc_data;
+ c.count = 0;
+ c.error = 0;
+ status = acpi_walk_resources(adev->handle, METHOD_NAME__CRS,
+ acpi_dev_process_resource, &c);
+ if (ACPI_FAILURE(status)) {
+ acpi_dev_free_resource_list(list);
+ return c.error ? c.error : -EIO;
+ }
+
+ return c.count;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_get_resources);
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 16fcaf8dad3d..32fbc4e73a56 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -261,6 +261,16 @@ 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;
+};
+
+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 *),
+ void *preproc_data);
+
int acpi_check_resource_conflict(const struct resource *res);
int acpi_check_region(resource_size_t start, resource_size_t n,
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-04 10:46:32 +0000