EDAC/amd64: Decode syndrome before translating address

[ Upstream commit 8a2eaab7daf03b23ac902481218034ae2fae5e16 ]

AMD Family 17h systems currently require address translation in order to
report the system address of a DRAM ECC error. This is currently done
before decoding the syndrome information. The syndrome information does
not depend on the address translation, so the proper EDAC csrow/channel
reporting can function without the address. However, the syndrome
information will not be decoded if the address translation fails.

Decode the syndrome information before doing the address translation.
The syndrome information is architecturally defined in MCA_SYND and can
be considered robust. The address translation is system-specific and may
fail on newer systems without proper updates to the translation
algorithm.

Fixes: 713ad54675fd ("EDAC, amd64: Define and register UMC error decode function")
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: "linux-edac@vger.kernel.org" <linux-edac@vger.kernel.org>
Cc: James Morse <james.morse@arm.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Tony Luck <tony.luck@intel.com>
Link: https://lkml.kernel.org/r/20190821235938.118710-6-Yazen.Ghannam@amd.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index ffe56a8fe39dab95d363ad4d2ba6eff392b9387e..608fdab566b32845c9a2893bcda5f458623d1d7b 100644 (file)
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -2550,13 +2550,6 @@ static void decode_umc_error(int node_id, struct mce *m)
 
        err.channel = find_umc_channel(m);
 
-       if (umc_normaddr_to_sysaddr(m->addr, pvt->mc_node_id, err.channel, &sys_addr)) {
-               err.err_code = ERR_NORM_ADDR;
-               goto log_error;
-       }
-
-       error_address_to_page_and_offset(sys_addr, &err);
-
        if (!(m->status & MCI_STATUS_SYNDV)) {
                err.err_code = ERR_SYND;
                goto log_error;
@@ -2573,6 +2566,13 @@ static void decode_umc_error(int node_id, struct mce *m)
 
        err.csrow = m->synd & 0x7;
 
+       if (umc_normaddr_to_sysaddr(m->addr, pvt->mc_node_id, err.channel, &sys_addr)) {
+               err.err_code = ERR_NORM_ADDR;
+               goto log_error;
+       }
+
+       error_address_to_page_and_offset(sys_addr, &err);
+
 log_error:
        __log_ecc_error(mci, &err, ecc_type);
 }