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Diffstat (limited to 'drivers/dax/hmem/hmem.c')
-rw-r--r--drivers/dax/hmem/hmem.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/drivers/dax/hmem/hmem.c b/drivers/dax/hmem/hmem.c
new file mode 100644
index 000000000..1bf040dbc
--- /dev/null
+++ b/drivers/dax/hmem/hmem.c
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/platform_device.h>
+#include <linux/memregion.h>
+#include <linux/module.h>
+#include <linux/pfn_t.h>
+#include "../bus.h"
+
+static bool region_idle;
+module_param_named(region_idle, region_idle, bool, 0644);
+
+static int dax_hmem_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct dax_region *dax_region;
+ struct memregion_info *mri;
+ struct dev_dax_data data;
+ struct dev_dax *dev_dax;
+ struct resource *res;
+ struct range range;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENOMEM;
+
+ mri = dev->platform_data;
+ range.start = res->start;
+ range.end = res->end;
+ dax_region = alloc_dax_region(dev, pdev->id, &range, mri->target_node,
+ PMD_SIZE, 0);
+ if (!dax_region)
+ return -ENOMEM;
+
+ data = (struct dev_dax_data) {
+ .dax_region = dax_region,
+ .id = -1,
+ .size = region_idle ? 0 : resource_size(res),
+ };
+ dev_dax = devm_create_dev_dax(&data);
+ if (IS_ERR(dev_dax))
+ return PTR_ERR(dev_dax);
+
+ /* child dev_dax instances now own the lifetime of the dax_region */
+ dax_region_put(dax_region);
+ return 0;
+}
+
+static int dax_hmem_remove(struct platform_device *pdev)
+{
+ /* devm handles teardown */
+ return 0;
+}
+
+static struct platform_driver dax_hmem_driver = {
+ .probe = dax_hmem_probe,
+ .remove = dax_hmem_remove,
+ .driver = {
+ .name = "hmem",
+ },
+};
+
+module_platform_driver(dax_hmem_driver);
+
+MODULE_ALIAS("platform:hmem*");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Intel Corporation");