From: Yazen Ghannam yazen.ghannam@amd.com
mainline inclusion from mainline-v5.2-rc1 commit 7835961d377b75ab9ae77f715e378fcb72508306 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I4MKP4 CVE: NA
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Future AMD systems may support x16 symbol sizes.
Recognize if a system is using x16 symbol size. Also, simplify the print statement.
Note that a x16 syndrome vector table is not necessary like with x4 or x8 syndromes. This is because systems that support x16 symbol sizes are SMCA systems and in that case, the syndrome can be directly extracted from the MCA_SYND[Syndrome] field.
[ bp: massage. ]
Signed-off-by: Yazen Ghannam yazen.ghannam@amd.com Signed-off-by: Borislav Petkov bp@suse.de Tested-by: Kim Phillips kim.phillips@amd.com Cc: James Morse james.morse@arm.com Cc: Mauro Carvalho Chehab mchehab@kernel.org Cc: linux-edac linux-edac@vger.kernel.org Link: https://lkml.kernel.org/r/20190228153558.127292-4-Yazen.Ghannam@amd.com Signed-off-by: Jackie Liu liuyun01@kylinos.cn Signed-off-by: Laibin Qiu qiulaibin@huawei.com --- drivers/edac/amd64_edac.c | 21 ++++++++++----------- drivers/edac/amd64_edac.h | 2 +- 2 files changed, 11 insertions(+), 12 deletions(-)
diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c index 29a452c83e13..c4d634225969 100644 --- a/drivers/edac/amd64_edac.c +++ b/drivers/edac/amd64_edac.c @@ -893,8 +893,7 @@ static void dump_misc_regs(struct amd64_pvt *pvt)
edac_dbg(1, " DramHoleValid: %s\n", dhar_valid(pvt) ? "yes" : "no");
- amd64_info("using %s syndromes.\n", - ((pvt->ecc_sym_sz == 8) ? "x8" : "x4")); + amd64_info("using x%u syndromes.\n", pvt->ecc_sym_sz); }
/* @@ -2618,17 +2617,17 @@ static void determine_ecc_sym_sz(struct amd64_pvt *pvt)
for_each_umc(i) { /* Check enabled channels only: */ - if ((pvt->umc[i].sdp_ctrl & UMC_SDP_INIT) && - (pvt->umc[i].ecc_ctrl & BIT(7))) { - pvt->ecc_sym_sz = 8; - break; + if (pvt->umc[i].sdp_ctrl & UMC_SDP_INIT) { + if (pvt->umc[i].ecc_ctrl & BIT(9)) { + pvt->ecc_sym_sz = 16; + return; + } else if (pvt->umc[i].ecc_ctrl & BIT(7)) { + pvt->ecc_sym_sz = 8; + return; + } } } - - return; - } - - if (pvt->fam >= 0x10) { + } else if (pvt->fam >= 0x10) { u32 tmp;
amd64_read_pci_cfg(pvt->F3, EXT_NB_MCA_CFG, &tmp); diff --git a/drivers/edac/amd64_edac.h b/drivers/edac/amd64_edac.h index df269383f47f..4dce6a2ac75f 100644 --- a/drivers/edac/amd64_edac.h +++ b/drivers/edac/amd64_edac.h @@ -365,7 +365,7 @@ struct amd64_pvt { u32 dct_sel_hi; /* DRAM Controller Select High */ u32 online_spare; /* On-Line spare Reg */
- /* x4 or x8 syndromes in use */ + /* x4, x8, or x16 syndromes in use */ u8 ecc_sym_sz;
/* place to store error injection parameters prior to issue */