[RFC PATCH v3 09/10] EDAC/amd64: Use cached data when checking for ECC

[Ghannam, Yazen]

From: Yazen Ghannam <yazen.ghan...@amd.com>

...now that the data is available earlier.

Signed-off-by: Yazen Ghannam <yazen.ghan...@amd.com>
---
 drivers/edac/amd64_edac.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 84832771dec0..c1cb0234f085 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -3183,31 +3183,27 @@ static const char *ecc_msg =
        "'ecc_enable_override'.\n"
        " (Note that use of the override may cause unknown side effects.)\n";
 
-static bool ecc_enabled(struct pci_dev *F3, u16 nid)
+static bool ecc_enabled(struct amd64_pvt *pvt)
 {
+       u16 nid = pvt->mc_node_id;
        bool nb_mce_en = false;
        u8 ecc_en = 0, i;
        u32 value;
 
        if (boot_cpu_data.x86 >= 0x17) {
                u8 umc_en_mask = 0, ecc_en_mask = 0;
+               struct amd64_umc *umc;
 
                for_each_umc(i) {
-                       u32 base = get_umc_base(i);
+                       umc = &pvt->umc[i];
 
                        /* Only check enabled UMCs. */
-                       if (amd_smn_read(nid, base + UMCCH_SDP_CTRL, &value))
-                               continue;
-
-                       if (!(value & UMC_SDP_INIT))
+                       if (!(umc->sdp_ctrl & UMC_SDP_INIT))
                                continue;
 
                        umc_en_mask |= BIT(i);
 
-                       if (amd_smn_read(nid, base + UMCCH_UMC_CAP_HI, &value))
-                               continue;
-
-                       if (value & UMC_ECC_ENABLED)
+                       if (umc->umc_cap_hi & UMC_ECC_ENABLED)
                                ecc_en_mask |= BIT(i);
                }
 
@@ -3220,7 +3216,7 @@ static bool ecc_enabled(struct pci_dev *F3, u16 nid)
                /* Assume UMC MCA banks are enabled. */
                nb_mce_en = true;
        } else {
-               amd64_read_pci_cfg(F3, NBCFG, &value);
+               amd64_read_pci_cfg(pvt->F3, NBCFG, &value);
 
                ecc_en = !!(value & NBCFG_ECC_ENABLE);
 
@@ -3539,7 +3535,7 @@ static int probe_one_instance(unsigned int nid)
        if (ret < 0)
                goto err_enable;
 
-       if (!ecc_enabled(F3, nid)) {
+       if (!ecc_enabled(pvt)) {
                ret = 0;
 
                if (!ecc_enable_override)
-- 
2.17.1