i7core: better document i7core_get_active_channels()

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/edac/i7core_edac.c b/drivers/edac/i7core_edac.c
index 79636b58ec526afbfd02b2ac444bac93421025d0..bf0374062e3d5346d6aff941d0718116ae643a86 100644 (file)
--- a/drivers/edac/i7core_edac.c
+++ b/drivers/edac/i7core_edac.c
@@ -333,7 +333,6 @@ static inline int numcol(u32 col)
        return cols[col & 0x3];
 }
 
-
 /****************************************************************************
                        Memory check routines
  ****************************************************************************/
@@ -355,6 +354,23 @@ static struct pci_dev *get_pdev_slot_func(u8 socket, unsigned slot,
        return NULL;
 }
 
+/**
+ * i7core_get_active_channels() - gets the number of channels and csrows
+ * @socket:    Quick Path Interconnect socket
+ * @channels:  Number of channels that will be returned
+ * @csrows:    Number of csrows found
+ *
+ * Since EDAC core needs to know in advance the number of available channels
+ * and csrows, in order to allocate memory for csrows/channels, it is needed
+ * to run two similar steps. At the first step, implemented on this function,
+ * it checks the number of csrows/channels present at one socket.
+ * this is used in order to properly allocate the size of mci components.
+ *
+ * It should be noticed that none of the current available datasheets explain
+ * or even mention how csrows are seen by the memory controller. So, we need
+ * to add a fake description for csrows.
+ * So, this driver is attributing one DIMM memory for one csrow.
+ */
 static int i7core_get_active_channels(u8 socket, unsigned *channels,
                                      unsigned *csrows)
 {