EDAC driver needs to look up attributes of NVDIMMs provided in SMBIOS.
Provide a function that looks up an acpi_nfit_memory_map from a device
handle (node/socket/mc/channel/dimm) and returns the SMBIOS handle.
Also pass back the "flags" so we can see if the NVDIMM is OK.
Acked-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
---
drivers/acpi/nfit/core.c | 27 +++++++++++++++++++++++++++
include/acpi/nfit.h | 18 ++++++++++++++++++
2 files changed, 45 insertions(+)
create mode 100644 include/acpi/nfit.h
diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index bbe48ad20886..4d6eeb1793e6 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -23,6 +23,7 @@
#include <linux/io.h>
#include <linux/nd.h>
#include <asm/cacheflush.h>
+#include <acpi/nfit.h>
#include "nfit.h"
/*
@@ -690,6 +691,32 @@ static bool add_memdev(struct acpi_nfit_desc *acpi_desc,
return true;
}
+int nfit_get_smbios_id(u32 device_handle, u16 *flags)
+{
+ struct acpi_nfit_memory_map *memdev;
+ struct acpi_nfit_desc *acpi_desc;
+ struct nfit_mem *nfit_mem;
+
+ mutex_lock(&acpi_desc_lock);
+ list_for_each_entry(acpi_desc, &acpi_descs, list) {
+ mutex_lock(&acpi_desc->init_mutex);
+ list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
+ memdev = __to_nfit_memdev(nfit_mem);
+ if (memdev->device_handle == device_handle) {
+ mutex_unlock(&acpi_desc->init_mutex);
+ mutex_unlock(&acpi_desc_lock);
+ *flags = memdev->flags;
+ return memdev->physical_id;
+ }
+ }
+ mutex_unlock(&acpi_desc->init_mutex);
+ }
+ mutex_unlock(&acpi_desc_lock);
+
+ return -ENODEV;
+}
+EXPORT_SYMBOL_GPL(nfit_get_smbios_id);
+
/*
* An implementation may provide a truncated control region if no block windows
* are defined.
diff --git a/include/acpi/nfit.h b/include/acpi/nfit.h
new file mode 100644
index 000000000000..86ed07c1200d
--- /dev/null
+++ b/include/acpi/nfit.h
@@ -0,0 +1,18 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0
+ * Copyright (C) 2018 Intel Corporation
+ */
+
+#ifndef __ACPI_NFIT_H
+#define __ACPI_NFIT_H
+
+#if IS_ENABLED(CONFIG_ACPI_NFIT)
+int nfit_get_smbios_id(u32 device_handle, u16 *flags);
+#else
+static inline int nfit_get_smbios_id(u32 device_handle, u16 *flags)
+{
+ return -EOPNOTSUPP;
+}
+#endif
+
+#endif /* __ACPI_NFIT_H */
--
2.14.1
--
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