amd64_edac: Revamp online spare handling

Replace per-DCT macros with smarter ones, drop hack and look for the
spare rank on all chip selects on a channel.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>

2 files changed, 15 insertions, 21 deletions

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 1cbe9cac6539..4bba43e7ee85 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -393,6 +393,9 @@ static void get_cs_base_and_mask(struct amd64_pvt *pvt, int csrow, u8 dct,
 #define for_each_chip_select(i, dct, pvt) \
         for (i = 0; i < pvt->csels[dct].b_cnt; i++)
 
+#define chip_select_base(i, dct, pvt) \
+        pvt->csels[dct].csbases[i]
+
 #define for_each_chip_select_mask(i, dct, pvt) \
         for (i = 0; i < pvt->csels[dct].m_cnt; i++)
 
@@ -1254,30 +1257,23 @@ static u64 f10_get_norm_dct_addr(struct amd64_pvt *pvt, int range,
         return (sys_addr & GENMASK(6,47)) - (chan_off & GENMASK(23,47));
 }
 
-/* Hack for the time being - Can we get this from BIOS?? */
-#define CH0SPARE_RANK   0
-#define CH1SPARE_RANK   1
-
 /*
  * checks if the csrow passed in is marked as SPARED, if so returns the new
  * spare row
  */
 static int f10_process_possible_spare(struct amd64_pvt *pvt, u8 dct, int csrow)
 {
-        u32 swap_done;
-        u32 bad_dram_cs;
+        int tmp_cs;
 
-        /* Depending on channel, isolate respective SPARING info */
-        if (dct) {
-                swap_done = F10_ONLINE_SPARE_SWAPDONE1(pvt->online_spare);
-                bad_dram_cs = F10_ONLINE_SPARE_BADDRAM_CS1(pvt->online_spare);
-                if (swap_done && (csrow == bad_dram_cs))
-                        csrow = CH1SPARE_RANK;
-        } else {
-                swap_done = F10_ONLINE_SPARE_SWAPDONE0(pvt->online_spare);
-                bad_dram_cs = F10_ONLINE_SPARE_BADDRAM_CS0(pvt->online_spare);
-                if (swap_done && (csrow == bad_dram_cs))
-                        csrow = CH0SPARE_RANK;
+        if (online_spare_swap_done(pvt, dct) &&
+            csrow == online_spare_bad_dramcs(pvt, dct)) {
+
+                for_each_chip_select(tmp_cs, dct, pvt) {
+                        if (chip_select_base(tmp_cs, dct, pvt) & 0x2) {
+                                csrow = tmp_cs;
+                                break;
+                        }
+                }
         }
         return csrow;
 }
diff --git a/drivers/edac/amd64_edac.h b/drivers/edac/amd64_edac.h
index 85e3acbc087a..3c60b2f2aeb6 100644
--- a/drivers/edac/amd64_edac.h
+++ b/drivers/edac/amd64_edac.h
@@ -259,10 +259,8 @@
 #define SCRCTRL                         0x58
 
 #define F10_ONLINE_SPARE                0xB0
-#define F10_ONLINE_SPARE_SWAPDONE0(x)   ((x) & BIT(1))
-#define F10_ONLINE_SPARE_SWAPDONE1(x)   ((x) & BIT(3))
-#define F10_ONLINE_SPARE_BADDRAM_CS0(x) (((x) >> 4) & 0x00000007)
-#define F10_ONLINE_SPARE_BADDRAM_CS1(x) (((x) >> 8) & 0x00000007)
+#define online_spare_swap_done(pvt, c)  (((pvt)->online_spare >> (1 + 2 * (c))) & 0x1)
+#define online_spare_bad_dramcs(pvt, c) (((pvt)->online_spare >> (4 + 4 * (c))) & 0x7)
 
 #define F10_NB_ARRAY_ADDR               0xB8
 #define F10_NB_ARRAY_DRAM_ECC           BIT(31)