[PATCH] edac.h: Add generic layers for describing a memory location

[Mauro Carvalho Chehab <mchehab@redhat.com>]

The edac core were written with the idea that memory controllers
are able to directly access csrows, and that the channels are
used inside a csrows select.

This is not true for FB-DIMM and RAMBUS memory controllers.

Also, some recent advanced memory controllers don't present a per-csrows
view. Instead, they view memories as DIMMs, instead of ranks, accessed
via csrow/channel.

So, changes are needed in order to allow the EDAC core to
work with all types of architectures.

In preparation for handling non-csrows based memory controllers,
add some memory structs and a macro:

enum hw_event_mc_err_type: describes the type of error
			   (corrected, uncorrected, fatal)

To be used by the new edac_mc_handle_error function;

enum edac_mc_layer: describes the type of a given memory
architecture layer (branch, channel, slot, csrow).

struct edac_mc_layer: describes the properties of a memory
		      layer (type, size, and if the layer
		      will be used on a virtual csrow.

EDAC_DIMM_PTR() - as the number of layers can vary from 1 to 3,
this macro converts from an address with up to 3 layers into
a linear address.

Cc: Doug Thompson <norsk5@yahoo.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
---
v15: Fixed some comments, is_csrow renamed to is_virt_csrow,
     GET_POS renamed to EDAC_DIMM_PTR


 include/linux/edac.h |   83 +++++++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 82 insertions(+), 1 deletions(-)

diff --git a/include/linux/edac.h b/include/linux/edac.h
index 8b78bd0..243a92b 100644
--- a/include/linux/edac.h
+++ b/include/linux/edac.h
@@ -67,6 +67,25 @@ enum dev_type {
 #define DEV_FLAG_X64		BIT(DEV_X64)
 
 /**
+ * enum hw_event_mc_err_type - type of the detected error
+ *
+ * @HW_EVENT_ERR_CORRECTED:	Corrected Error - Indicates that an ECC
+ *				corrected error was detected
+ * @HW_EVENT_ERR_UNCORRECTED:	Uncorrected Error - Indicates an error that
+ *				can't be corrected by ECC, but it is not
+ *				fatal (maybe it is on an unused memory area,
+ *				or the memory controller could recover from
+ *				it for example, by re-trying the operation).
+ * @HW_EVENT_ERR_FATAL:		Fatal Error - Uncorrected error that could not
+ *				be recovered.
+ */
+enum hw_event_mc_err_type {
+	HW_EVENT_ERR_CORRECTED,
+	HW_EVENT_ERR_UNCORRECTED,
+	HW_EVENT_ERR_FATAL,
+};
+
+/**
  * enum mem_type - memory types. For a more detailed reference, please see
  *			http://en.wikipedia.org/wiki/DRAM
  *
@@ -308,7 +327,69 @@ enum scrub_type {
  * PS - I enjoyed writing all that about as much as you enjoyed reading it.
  */
 
-/* FIXME: add a per-dimm ce error count */
+/**
+ * enum edac_mc_layer - memory controller hierarchy layer
+ *
+ * @EDAC_MC_LAYER_BRANCH:	memory layer is named "branch"
+ * @EDAC_MC_LAYER_CHANNEL:	memory layer is named "channel"
+ * @EDAC_MC_LAYER_SLOT:		memory layer is named "slot"
+ * @EDAC_MC_LAYER_CHIP_SELECT:	memory layer is named "chip select"
+ *
+ * This enum is used by the drivers to tell edac_mc_sysfs what name should
+ * be used when describing a memory stick location.
+ */
+enum edac_mc_layer_type {
+	EDAC_MC_LAYER_BRANCH,
+	EDAC_MC_LAYER_CHANNEL,
+	EDAC_MC_LAYER_SLOT,
+	EDAC_MC_LAYER_CHIP_SELECT,
+};
+
+/**
+ * struct edac_mc_layer - describes the memory controller hierarchy
+ * @layer:		layer type
+ * @size:maximum size of the layer
+ * @is_virt_csrow:	This layer is part of the "csrow" when old API
+ *			compatibility mode is enabled. Otherwise, it is
+ *			a channel
+ */
+struct edac_mc_layer {
+	enum edac_mc_layer_type	type;
+	unsigned		size;
+	bool			is_virt_csrow;
+};
+
+/*
+ * Maximum number of layers used by the memory controller to uniquely
+ * identify a single memory stick.
+ * NOTE: incrementing it would require changes at edac_mc_handle_error()
+ * and at the routines at edac_mc_sysfs that create layers
+ */
+#define EDAC_MAX_LAYERS		3
+
+/*
+ * A loop could be used here to make it more generic, but, as we only have
+ * 3 layers, this is a little faster. By design, layers can never be 0 or
+ * more than 3. If that ever happens, a NULL is returned, causing an OOPS
+ * during the memory allocation routine, with would point to the developer
+ * that he's doing something wrong.
+ */
+#define EDAC_DIMM_PTR(layers, var, nlayers, lay0, lay1, lay2) ({		\
+	typeof(var) __p;						\
+	if ((nlayers) == 1)						\
+		__p = &var[lay0];					\
+	else if ((nlayers) == 2)					\
+		__p = &var[(lay1) + ((layers[1]).size * (lay0))];	\
+	else if ((nlayers) == 3)					\
+		__p = &var[(lay2) + ((layers[2]).size * ((lay1) +	\
+			    ((layers[1]).size * (lay0))))];		\
+	else								\
+		__p = NULL;						\
+	__p;								\
+})
+
+
+/* FIXME: add the proper per-location error counts */
 struct dimm_info {
 	char label[EDAC_MC_LABEL_LEN + 1];	/* DIMM label on motherboard */
 	unsigned memory_controller;
-- 
1.7.8