amd64_edac: add EDAC core-related initializers

Borislav:

- add a amd64_free_mc_sibling_devices() helper instead of opencoding the
  release-path.
- fix/cleanup 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, 315 insertions, 0 deletions

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 09991c8a6ee3..5a6e714b115e 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -2455,4 +2455,319 @@ int amd64_process_error_info(struct mem_ctl_info *mci,
 }
 EXPORT_SYMBOL_GPL(amd64_process_error_info);
 
+/*
+ * The main polling 'check' function, called FROM the edac core to perform the
+ * error checking and if an error is encountered, error processing.
+ */
+static void amd64_check(struct mem_ctl_info *mci)
+{
+        struct amd64_error_info_regs info;
+
+        if (amd64_get_error_info(mci, &info))
+                amd64_process_error_info(mci, &info, 1);
+}
+
+/*
+ * Input:
+ *      1) struct amd64_pvt which contains pvt->dram_f2_ctl pointer
+ *      2) AMD Family index value
+ *
+ * Ouput:
+ *      Upon return of 0, the following filled in:
+ *
+ *              struct pvt->addr_f1_ctl
+ *              struct pvt->misc_f3_ctl
+ *
+ *      Filled in with related device funcitions of 'dram_f2_ctl'
+ *      These devices are "reserved" via the pci_get_device()
+ *
+ *      Upon return of 1 (error status):
+ *
+ *              Nothing reserved
+ */
+static int amd64_reserve_mc_sibling_devices(struct amd64_pvt *pvt, int mc_idx)
+{
+        const struct amd64_family_type *amd64_dev = &amd64_family_types[mc_idx];
+
+        /* Reserve the ADDRESS MAP Device */
+        pvt->addr_f1_ctl = pci_get_related_function(pvt->dram_f2_ctl->vendor,
+                                                    amd64_dev->addr_f1_ctl,
+                                                    pvt->dram_f2_ctl);
+
+        if (!pvt->addr_f1_ctl) {
+                amd64_printk(KERN_ERR, "error address map device not found: "
+                             "vendor %x device 0x%x (broken BIOS?)\n",
+                             PCI_VENDOR_ID_AMD, amd64_dev->addr_f1_ctl);
+                return 1;
+        }
+
+        /* Reserve the MISC Device */
+        pvt->misc_f3_ctl = pci_get_related_function(pvt->dram_f2_ctl->vendor,
+                                                    amd64_dev->misc_f3_ctl,
+                                                    pvt->dram_f2_ctl);
+
+        if (!pvt->misc_f3_ctl) {
+                pci_dev_put(pvt->addr_f1_ctl);
+                pvt->addr_f1_ctl = NULL;
+
+                amd64_printk(KERN_ERR, "error miscellaneous device not found: "
+                             "vendor %x device 0x%x (broken BIOS?)\n",
+                             PCI_VENDOR_ID_AMD, amd64_dev->misc_f3_ctl);
+                return 1;
+        }
+
+        debugf1("    Addr Map device PCI Bus ID:\t%s\n",
+                pci_name(pvt->addr_f1_ctl));
+        debugf1("    DRAM MEM-CTL PCI Bus ID:\t%s\n",
+                pci_name(pvt->dram_f2_ctl));
+        debugf1("    Misc device PCI Bus ID:\t%s\n",
+                pci_name(pvt->misc_f3_ctl));
+
+        return 0;
+}
+
+static void amd64_free_mc_sibling_devices(struct amd64_pvt *pvt)
+{
+        pci_dev_put(pvt->addr_f1_ctl);
+        pci_dev_put(pvt->misc_f3_ctl);
+}
+
+/*
+ * Retrieve the hardware registers of the memory controller (this includes the
+ * 'Address Map' and 'Misc' device regs)
+ */
+static void amd64_read_mc_registers(struct amd64_pvt *pvt)
+{
+        u64 msr_val;
+        int dram, err = 0;
+
+        /*
+         * Retrieve TOP_MEM and TOP_MEM2; no masking off of reserved bits since
+         * those are Read-As-Zero
+         */
+        rdmsrl(MSR_K8_TOP_MEM1, msr_val);
+        pvt->top_mem = msr_val >> 23;
+        debugf0("  TOP_MEM=0x%08llx\n", pvt->top_mem);
+
+        /* check first whether TOP_MEM2 is enabled */
+        rdmsrl(MSR_K8_SYSCFG, msr_val);
+        if (msr_val & (1U << 21)) {
+                rdmsrl(MSR_K8_TOP_MEM2, msr_val);
+                pvt->top_mem2 = msr_val >> 23;
+                debugf0("  TOP_MEM2=0x%08llx\n", pvt->top_mem2);
+        } else
+                debugf0("  TOP_MEM2 disabled.\n");
+
+        amd64_cpu_display_info(pvt);
+
+        err = pci_read_config_dword(pvt->misc_f3_ctl, K8_NBCAP, &pvt->nbcap);
+        if (err)
+                goto err_reg;
+
+        if (pvt->ops->read_dram_ctl_register)
+                pvt->ops->read_dram_ctl_register(pvt);
+
+        for (dram = 0; dram < DRAM_REG_COUNT; dram++) {
+                /*
+                 * Call CPU specific READ function to get the DRAM Base and
+                 * Limit values from the DCT.
+                 */
+                pvt->ops->read_dram_base_limit(pvt, dram);
+
+                /*
+                 * Only print out debug info on rows with both R and W Enabled.
+                 * Normal processing, compiler should optimize this whole 'if'
+                 * debug output block away.
+                 */
+                if (pvt->dram_rw_en[dram] != 0) {
+                        debugf1("  DRAM_BASE[%d]: 0x%8.08x-%8.08x "
+                                "DRAM_LIMIT:  0x%8.08x-%8.08x\n",
+                                dram,
+                                (u32)(pvt->dram_base[dram] >> 32),
+                                (u32)(pvt->dram_base[dram] & 0xFFFFFFFF),
+                                (u32)(pvt->dram_limit[dram] >> 32),
+                                (u32)(pvt->dram_limit[dram] & 0xFFFFFFFF));
+                        debugf1("        IntlvEn=%s %s %s "
+                                "IntlvSel=%d DstNode=%d\n",
+                                pvt->dram_IntlvEn[dram] ?
+                                        "Enabled" : "Disabled",
+                                (pvt->dram_rw_en[dram] & 0x2) ? "W" : "!W",
+                                (pvt->dram_rw_en[dram] & 0x1) ? "R" : "!R",
+                                pvt->dram_IntlvSel[dram],
+                                pvt->dram_DstNode[dram]);
+                }
+        }
+
+        amd64_read_dct_base_mask(pvt);
+
+        err = pci_read_config_dword(pvt->addr_f1_ctl, K8_DHAR, &pvt->dhar);
+        if (err)
+                goto err_reg;
+
+        amd64_read_dbam_reg(pvt);
+
+        err = pci_read_config_dword(pvt->misc_f3_ctl,
+                                F10_ONLINE_SPARE, &pvt->online_spare);
+        if (err)
+                goto err_reg;
+
+        err = pci_read_config_dword(pvt->dram_f2_ctl, F10_DCLR_0, &pvt->dclr0);
+        if (err)
+                goto err_reg;
+
+        err = pci_read_config_dword(pvt->dram_f2_ctl, F10_DCHR_0, &pvt->dchr0);
+        if (err)
+                goto err_reg;
+
+        if (!dct_ganging_enabled(pvt)) {
+                err = pci_read_config_dword(pvt->dram_f2_ctl, F10_DCLR_1,
+                                                &pvt->dclr1);
+                if (err)
+                        goto err_reg;
+
+                err = pci_read_config_dword(pvt->dram_f2_ctl, F10_DCHR_1,
+                                                &pvt->dchr1);
+                if (err)
+                        goto err_reg;
+        }
+
+        amd64_dump_misc_regs(pvt);
+
+err_reg:
+        debugf0("Reading an MC register failed\n");
+
+}
+
+/*
+ * NOTE: CPU Revision Dependent code
+ *
+ * Input:
+ *      @csrow_nr ChipSelect Row Number (0..CHIPSELECT_COUNT-1)
+ *      k8 private pointer to -->
+ *                      DRAM Bank Address mapping register
+ *                      node_id
+ *                      DCL register where dual_channel_active is
+ *
+ * The DBAM register consists of 4 sets of 4 bits each definitions:
+ *
+ * Bits:        CSROWs
+ * 0-3          CSROWs 0 and 1
+ * 4-7          CSROWs 2 and 3
+ * 8-11         CSROWs 4 and 5
+ * 12-15        CSROWs 6 and 7
+ *
+ * Values range from: 0 to 15
+ * The meaning of the values depends on CPU revision and dual-channel state,
+ * see relevant BKDG more info.
+ *
+ * The memory controller provides for total of only 8 CSROWs in its current
+ * architecture. Each "pair" of CSROWs normally represents just one DIMM in
+ * single channel or two (2) DIMMs in dual channel mode.
+ *
+ * The following code logic collapses the various tables for CSROW based on CPU
+ * revision.
+ *
+ * Returns:
+ *      The number of PAGE_SIZE pages on the specified CSROW number it
+ *      encompasses
+ *
+ */
+static u32 amd64_csrow_nr_pages(int csrow_nr, struct amd64_pvt *pvt)
+{
+        u32 dram_map, nr_pages;
+
+        /*
+         * The math on this doesn't look right on the surface because x/2*4 can
+         * be simplified to x*2 but this expression makes use of the fact that
+         * it is integral math where 1/2=0. This intermediate value becomes the
+         * number of bits to shift the DBAM register to extract the proper CSROW
+         * field.
+         */
+        dram_map = (pvt->dbam0 >> ((csrow_nr / 2) * 4)) & 0xF;
+
+        nr_pages = pvt->ops->dbam_map_to_pages(pvt, dram_map);
+
+        /*
+         * If dual channel then double the memory size of single channel.
+         * Channel count is 1 or 2
+         */
+        nr_pages <<= (pvt->channel_count - 1);
+
+        debugf0("  (csrow=%d) DBAM map index= %d\n", csrow_nr, dram_map);
+        debugf0("    nr_pages= %u  channel-count = %d\n",
+                nr_pages, pvt->channel_count);
+
+        return nr_pages;
+}
+
+/*
+ * Initialize the array of csrow attribute instances, based on the values
+ * from pci config hardware registers.
+ */
+static int amd64_init_csrows(struct mem_ctl_info *mci)
+{
+        struct csrow_info *csrow;
+        struct amd64_pvt *pvt;
+        u64 input_addr_min, input_addr_max, sys_addr;
+        int i, err = 0, empty = 1;
+
+        pvt = mci->pvt_info;
+
+        err = pci_read_config_dword(pvt->misc_f3_ctl, K8_NBCFG, &pvt->nbcfg);
+        if (err)
+                debugf0("Reading K8_NBCFG failed\n");
+
+        debugf0("NBCFG= 0x%x  CHIPKILL= %s DRAM ECC= %s\n", pvt->nbcfg,
+                (pvt->nbcfg & K8_NBCFG_CHIPKILL) ? "Enabled" : "Disabled",
+                (pvt->nbcfg & K8_NBCFG_ECC_ENABLE) ? "Enabled" : "Disabled"
+                );
+
+        for (i = 0; i < CHIPSELECT_COUNT; i++) {
+                csrow = &mci->csrows[i];
+
+                if ((pvt->dcsb0[i] & K8_DCSB_CS_ENABLE) == 0) {
+                        debugf1("----CSROW %d EMPTY for node %d\n", i,
+                                pvt->mc_node_id);
+                        continue;
+                }
+
+                debugf1("----CSROW %d VALID for MC node %d\n",
+                        i, pvt->mc_node_id);
+
+                empty = 0;
+                csrow->nr_pages = amd64_csrow_nr_pages(i, pvt);
+                find_csrow_limits(mci, i, &input_addr_min, &input_addr_max);
+                sys_addr = input_addr_to_sys_addr(mci, input_addr_min);
+                csrow->first_page = (u32) (sys_addr >> PAGE_SHIFT);
+                sys_addr = input_addr_to_sys_addr(mci, input_addr_max);
+                csrow->last_page = (u32) (sys_addr >> PAGE_SHIFT);
+                csrow->page_mask = ~mask_from_dct_mask(pvt, i);
+                /* 8 bytes of resolution */
+
+                csrow->mtype = amd64_determine_memory_type(pvt);
+
+                debugf1("  for MC node %d csrow %d:\n", pvt->mc_node_id, i);
+                debugf1("    input_addr_min: 0x%lx input_addr_max: 0x%lx\n",
+                        (unsigned long)input_addr_min,
+                        (unsigned long)input_addr_max);
+                debugf1("    sys_addr: 0x%lx  page_mask: 0x%lx\n",
+                        (unsigned long)sys_addr, csrow->page_mask);
+                debugf1("    nr_pages: %u  first_page: 0x%lx "
+                        "last_page: 0x%lx\n",
+                        (unsigned)csrow->nr_pages,
+                        csrow->first_page, csrow->last_page);
+
+                /*
+                 * determine whether CHIPKILL or JUST ECC or NO ECC is operating
+                 */
+                if (pvt->nbcfg & K8_NBCFG_ECC_ENABLE)
+                        csrow->edac_mode =
+                            (pvt->nbcfg & K8_NBCFG_CHIPKILL) ?
+                            EDAC_S4ECD4ED : EDAC_SECDED;
+                else
+                        csrow->edac_mode = EDAC_NONE;
+        }
+
+        return empty;
+}