acpi, nfit: Add function to look up nvdimm device and provide SMBIOS …

…handle 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 <[email protected]> Signed-off-by: Tony Luck <[email protected]> Cc: "Rafael J. Wysocki" <[email protected]> Cc: Aristeu Rozanski <[email protected]> Cc: Dan Williams <[email protected]> Cc: Erik Schmauss <[email protected]> Cc: Jean Delvare <[email protected]> Cc: Len Brown <[email protected]> Cc: Mauro Carvalho Chehab <[email protected]> Cc: Qiuxu Zhuo <[email protected]> Cc: Robert Moore <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Borislav Petkov <[email protected]>
vieko · Mar 14, 2018 · 23222f8 · 23222f8
1 parent 001f861
commit 23222f8
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diff --git 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
@@ -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 */