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authorYazen Ghannam <Yazen.Ghannam@amd.com>2016-11-23 00:40:16 +0300
committerBorislav Petkov <bp@suse.de>2016-11-23 21:04:11 +0300
commit044e7a414be9ba20826e5fd482214686193fe7b6 (patch)
treeb2c6c6f54eb54c1f10c7f04ed7baef3d468cd159 /drivers/edac
parentd12a969ebbfcfc25853c4147d42b388f758e8784 (diff)
downloadlinux-044e7a414be9ba20826e5fd482214686193fe7b6.tar.xz
EDAC, amd64: Don't force-enable ECC checking on newer systems
It's not recommended for the OS to try and force-enable ECC checking. This is considered a firmware task since it includes memory training, etc, so don't change ECC settings on Fam17h or newer systems and inform the user. Signed-off-by: Yazen Ghannam <Yazen.Ghannam@amd.com> Cc: Aravind Gopalakrishnan <aravindksg.lkml@gmail.com> Cc: linux-edac <linux-edac@vger.kernel.org> Link: http://lkml.kernel.org/r/1479850816-1595-1-git-send-email-Yazen.Ghannam@amd.com [ Put the "forcing" message in an else branch. ] Signed-off-by: Borislav Petkov <bp@suse.de>
Diffstat (limited to 'drivers/edac')
-rw-r--r--drivers/edac/amd64_edac.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index dd45cff02388..ca1d63aa4e59 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -2629,7 +2629,6 @@ static void restore_ecc_error_reporting(struct ecc_settings *s, u16 nid,
{
u32 value, mask = 0x3; /* UECC/CECC enable */
-
if (!s->nbctl_valid)
return;
@@ -2895,7 +2894,11 @@ static int probe_one_instance(unsigned int nid)
if (!ecc_enable_override)
goto err_enable;
- amd64_warn("Forcing ECC on!\n");
+ if (boot_cpu_data.x86 >= 0x17) {
+ amd64_warn("Forcing ECC on is not recommended on newer systems. Please enable ECC in BIOS.");
+ goto err_enable;
+ } else
+ amd64_warn("Forcing ECC on!\n");
if (!enable_ecc_error_reporting(s, nid, F3))
goto err_enable;
@@ -2904,7 +2907,9 @@ static int probe_one_instance(unsigned int nid)
ret = init_one_instance(nid);
if (ret < 0) {
amd64_err("Error probing instance: %d\n", nid);
- restore_ecc_error_reporting(s, nid, F3);
+
+ if (boot_cpu_data.x86 < 0x17)
+ restore_ecc_error_reporting(s, nid, F3);
}
return ret;