linux-kernel - [PATCH 3/6] ACPI: resource: Add helper function acpi_dev_get_memory

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Date:   Tue, 16 Aug 2022 13:16:26 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Utkarsh Patel <utkarsh.h.patel@...el.com>, rajmohan.mani@...el.com,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: [PATCH 3/6] ACPI: resource: Add helper function acpi_dev_get_memory_resources()

Wrapper function that finds all memory type resources by
using acpi_dev_get_resources(). It removes the need for the
drivers to check the resource data type separately.

Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
---
 drivers/acpi/resource.c | 17 +++++++++++++++++
 include/linux/acpi.h    |  1 +
 2 files changed, 18 insertions(+)

diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index e644e90d18847..8032d50ca9441 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -721,6 +721,23 @@ int acpi_dev_get_dma_resources(struct acpi_device *adev, struct list_head *list)
 }
 EXPORT_SYMBOL_GPL(acpi_dev_get_dma_resources);
 
+/**
+ * acpi_dev_get_memory_resources - Get current memory resources of a device.
+ * @adev: ACPI device node to get the resources for.
+ * @list: Head of the resultant list of resources (must be empty).
+ *
+ * This is a helper function that locates all memory type resources of @adev
+ * with acpi_dev_get_resources().
+ *
+ * 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_memory_resources(struct acpi_device *adev, struct list_head *list)
+{
+	return acpi_dev_get_resources(adev, list, is_memory, NULL);
+}
+EXPORT_SYMBOL_GPL(acpi_dev_get_memory_resources);
+
 /**
  * acpi_dev_filter_resource_type - Filter ACPI resource according to resource
  *				   types
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 6f64b2f3dc547..ed4aa395cc49b 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -506,6 +506,7 @@ int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list,
 			   void *preproc_data);
 int acpi_dev_get_dma_resources(struct acpi_device *adev,
 			       struct list_head *list);
+int acpi_dev_get_memory_resources(struct acpi_device *adev, struct list_head *list);
 int acpi_dev_filter_resource_type(struct acpi_resource *ares,
 				  unsigned long types);
 
-- 
2.35.1