amd64_edac: add k8-specific methods

Borislav:

- fix/cleanup/move comments
- fix function return value patterns
- cleanup debug calls

Reviewed-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Doug Thompson <dougthompson@xmission.com>
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>

1 files changed, 173 insertions, 0 deletions

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 5ec44a440d6..24c031f7975 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -1013,3 +1013,176 @@ static enum mem_type amd64_determine_memory_type(struct amd64_pvt *pvt)
         return type;
 }
 
+/*
+ * Read the DRAM Configuration Low register. It differs between CG, D & E revs
+ * and the later RevF memory controllers (DDR vs DDR2)
+ *
+ * Return:
+ *      number of memory channels in operation
+ * Pass back:
+ *      contents of the DCL0_LOW register
+ */
+static int k8_early_channel_count(struct amd64_pvt *pvt)
+{
+        int flag, err = 0;
+
+        err = pci_read_config_dword(pvt->dram_f2_ctl, F10_DCLR_0, &pvt->dclr0);
+        if (err)
+                return err;
+
+        if ((boot_cpu_data.x86_model >> 4) >= OPTERON_CPU_REV_F) {
+                /* RevF (NPT) and later */
+                flag = pvt->dclr0 & F10_WIDTH_128;
+        } else {
+                /* RevE and earlier */
+                flag = pvt->dclr0 & REVE_WIDTH_128;
+        }
+
+        /* not used */
+        pvt->dclr1 = 0;
+
+        return (flag) ? 2 : 1;
+}
+
+/* extract the ERROR ADDRESS for the K8 CPUs */
+static u64 k8_get_error_address(struct mem_ctl_info *mci,
+                                struct amd64_error_info_regs *info)
+{
+        return (((u64) (info->nbeah & 0xff)) << 32) +
+                        (info->nbeal & ~0x03);
+}
+
+/*
+ * Read the Base and Limit registers for K8 based Memory controllers; extract
+ * fields from the 'raw' reg into separate data fields
+ *
+ * Isolates: BASE, LIMIT, IntlvEn, IntlvSel, RW_EN
+ */
+static void k8_read_dram_base_limit(struct amd64_pvt *pvt, int dram)
+{
+        u32 low;
+        u32 off = dram << 3;    /* 8 bytes between DRAM entries */
+        int err;
+
+        err = pci_read_config_dword(pvt->addr_f1_ctl,
+                                    K8_DRAM_BASE_LOW + off, &low);
+        if (err)
+                debugf0("Reading K8_DRAM_BASE_LOW failed\n");
+
+        /* Extract parts into separate data entries */
+        pvt->dram_base[dram] = ((u64) low & 0xFFFF0000) << 8;
+        pvt->dram_IntlvEn[dram] = (low >> 8) & 0x7;
+        pvt->dram_rw_en[dram] = (low & 0x3);
+
+        err = pci_read_config_dword(pvt->addr_f1_ctl,
+                                    K8_DRAM_LIMIT_LOW + off, &low);
+        if (err)
+                debugf0("Reading K8_DRAM_LIMIT_LOW failed\n");
+
+        /*
+         * Extract parts into separate data entries. Limit is the HIGHEST memory
+         * location of the region, so lower 24 bits need to be all ones
+         */
+        pvt->dram_limit[dram] = (((u64) low & 0xFFFF0000) << 8) | 0x00FFFFFF;
+        pvt->dram_IntlvSel[dram] = (low >> 8) & 0x7;
+        pvt->dram_DstNode[dram] = (low & 0x7);
+}
+
+static void k8_map_sysaddr_to_csrow(struct mem_ctl_info *mci,
+                                        struct amd64_error_info_regs *info,
+                                        u64 SystemAddress)
+{
+        struct mem_ctl_info *src_mci;
+        unsigned short syndrome;
+        int channel, csrow;
+        u32 page, offset;
+
+        /* Extract the syndrome parts and form a 16-bit syndrome */
+        syndrome = EXTRACT_HIGH_SYNDROME(info->nbsl) << 8;
+        syndrome |= EXTRACT_LOW_SYNDROME(info->nbsh);
+
+        /* CHIPKILL enabled */
+        if (info->nbcfg & K8_NBCFG_CHIPKILL) {
+                channel = get_channel_from_ecc_syndrome(syndrome);
+                if (channel < 0) {
+                        /*
+                         * Syndrome didn't map, so we don't know which of the
+                         * 2 DIMMs is in error. So we need to ID 'both' of them
+                         * as suspect.
+                         */
+                        amd64_mc_printk(mci, KERN_WARNING,
+                                       "unknown syndrome 0x%x - possible error "
+                                       "reporting race\n", syndrome);
+                        edac_mc_handle_ce_no_info(mci, EDAC_MOD_STR);
+                        return;
+                }
+        } else {
+                /*
+                 * non-chipkill ecc mode
+                 *
+                 * The k8 documentation is unclear about how to determine the
+                 * channel number when using non-chipkill memory.  This method
+                 * was obtained from email communication with someone at AMD.
+                 * (Wish the email was placed in this comment - norsk)
+                 */
+                channel = ((SystemAddress & BIT(3)) != 0);
+        }
+
+        /*
+         * Find out which node the error address belongs to. This may be
+         * different from the node that detected the error.
+         */
+        src_mci = find_mc_by_sys_addr(mci, SystemAddress);
+        if (src_mci) {
+                amd64_mc_printk(mci, KERN_ERR,
+                             "failed to map error address 0x%lx to a node\n",
+                             (unsigned long)SystemAddress);
+                edac_mc_handle_ce_no_info(mci, EDAC_MOD_STR);
+                return;
+        }
+
+        /* Now map the SystemAddress to a CSROW */
+        csrow = sys_addr_to_csrow(src_mci, SystemAddress);
+        if (csrow < 0) {
+                edac_mc_handle_ce_no_info(src_mci, EDAC_MOD_STR);
+        } else {
+                error_address_to_page_and_offset(SystemAddress, &page, &offset);
+
+                edac_mc_handle_ce(src_mci, page, offset, syndrome, csrow,
+                                  channel, EDAC_MOD_STR);
+        }
+}
+
+/*
+ * determrine the number of PAGES in for this DIMM's size based on its DRAM
+ * Address Mapping.
+ *
+ * First step is to calc the number of bits to shift a value of 1 left to
+ * indicate show many pages. Start with the DBAM value as the starting bits,
+ * then proceed to adjust those shift bits, based on CPU rev and the table.
+ * See BKDG on the DBAM
+ */
+static int k8_dbam_map_to_pages(struct amd64_pvt *pvt, int dram_map)
+{
+        int nr_pages;
+
+        if (pvt->ext_model >= OPTERON_CPU_REV_F) {
+                nr_pages = 1 << (revf_quad_ddr2_shift[dram_map] - PAGE_SHIFT);
+        } else {
+                /*
+                 * RevE and less section; this line is tricky. It collapses the
+                 * table used by RevD and later to one that matches revisions CG
+                 * and earlier.
+                 */
+                dram_map -= (pvt->ext_model >= OPTERON_CPU_REV_D) ?
+                                (dram_map > 8 ? 4 : (dram_map > 5 ?
+                                3 : (dram_map > 2 ? 1 : 0))) : 0;
+
+                /* 25 shift is 32MiB minimum DIMM size in RevE and prior */
+                nr_pages = 1 << (dram_map + 25 - PAGE_SHIFT);
+        }
+
+        return nr_pages;
+}
+
+