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authorBorislav Petkov <borislav.petkov@amd.com>2011-03-30 15:42:10 +0200
committerBorislav Petkov <borislav.petkov@amd.com>2011-04-26 16:18:56 +0200
commitc1ae68309b0c1ea67b72e9e94e26b4e819022fc7 (patch)
tree22ecef8f85044a4bffba23546477b1b79dd08be8
parentf08e457cecece7fbbdad3add9defac3373a59b5a (diff)
downloadlinux-c1ae68309b0c1ea67b72e9e94e26b4e819022fc7.tar.gz
amd64_edac: Erratum #637 workaround
F15h CPUs may report a non-DRAM address when reporting an error address belonging to a CC6 state save area. Add a workaround to detect this condition and compute the actual DRAM address of the error as documented in the Revision Guide for AMD Family 15h Models 00h-0Fh Processors. Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
-rw-r--r--drivers/edac/amd64_edac.c52
-rw-r--r--drivers/edac/amd64_edac.h1
2 files changed, 51 insertions, 2 deletions
diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index e17de90ba6c..9a8bebcf6b1 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -931,15 +931,63 @@ static int k8_early_channel_count(struct amd64_pvt *pvt)
/* On F10h and later ErrAddr is MC4_ADDR[47:1] */
static u64 get_error_address(struct mce *m)
{
+ struct cpuinfo_x86 *c = &boot_cpu_data;
+ u64 addr;
u8 start_bit = 1;
u8 end_bit = 47;
- if (boot_cpu_data.x86 == 0xf) {
+ if (c->x86 == 0xf) {
start_bit = 3;
end_bit = 39;
}
- return m->addr & GENMASK(start_bit, end_bit);
+ addr = m->addr & GENMASK(start_bit, end_bit);
+
+ /*
+ * Erratum 637 workaround
+ */
+ if (c->x86 == 0x15) {
+ struct amd64_pvt *pvt;
+ u64 cc6_base, tmp_addr;
+ u32 tmp;
+ u8 mce_nid, intlv_en;
+
+ if ((addr & GENMASK(24, 47)) >> 24 != 0x00fdf7)
+ return addr;
+
+ mce_nid = amd_get_nb_id(m->extcpu);
+ pvt = mcis[mce_nid]->pvt_info;
+
+ amd64_read_pci_cfg(pvt->F1, DRAM_LOCAL_NODE_LIM, &tmp);
+ intlv_en = tmp >> 21 & 0x7;
+
+ /* add [47:27] + 3 trailing bits */
+ cc6_base = (tmp & GENMASK(0, 20)) << 3;
+
+ /* reverse and add DramIntlvEn */
+ cc6_base |= intlv_en ^ 0x7;
+
+ /* pin at [47:24] */
+ cc6_base <<= 24;
+
+ if (!intlv_en)
+ return cc6_base | (addr & GENMASK(0, 23));
+
+ amd64_read_pci_cfg(pvt->F1, DRAM_LOCAL_NODE_BASE, &tmp);
+
+ /* faster log2 */
+ tmp_addr = (addr & GENMASK(12, 23)) << __fls(intlv_en + 1);
+
+ /* OR DramIntlvSel into bits [14:12] */
+ tmp_addr |= (tmp & GENMASK(21, 23)) >> 9;
+
+ /* add remaining [11:0] bits from original MC4_ADDR */
+ tmp_addr |= addr & GENMASK(0, 11);
+
+ return cc6_base | tmp_addr;
+ }
+
+ return addr;
}
static void read_dram_base_limit_regs(struct amd64_pvt *pvt, unsigned range)
diff --git a/drivers/edac/amd64_edac.h b/drivers/edac/amd64_edac.h
index 0110930c82e..9a666cb985b 100644
--- a/drivers/edac/amd64_edac.h
+++ b/drivers/edac/amd64_edac.h
@@ -196,6 +196,7 @@
#define DCT_CFG_SEL 0x10C
+#define DRAM_LOCAL_NODE_BASE 0x120
#define DRAM_LOCAL_NODE_LIM 0x124
#define DRAM_BASE_HI 0x140