amd64_edac: add debugging/testing code

This is for dumping different registers and testing the address mapping
logic using the ECC syndromes.

Borislav:

- split sysfs attrs per file
- use more conform names for the sysfs attrs
- fix function return value patterns
- cleanup/fix comments
- 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, 255 insertions, 0 deletions

diff --git a/drivers/edac/amd64_edac_dbg.c b/drivers/edac/amd64_edac_dbg.c
new file mode 100644
index 000000000000..0a41b248a4ad
--- /dev/null
+++ b/drivers/edac/amd64_edac_dbg.c
@@ -0,0 +1,255 @@
+#include "amd64_edac.h"
+
+/*
+ * accept a hex value and store it into the virtual error register file, field:
+ * nbeal and nbeah. Assume virtual error values have already been set for: NBSL,
+ * NBSH and NBCFG. Then proceed to map the error values to a MC, CSROW and
+ * CHANNEL
+ */
+static ssize_t amd64_nbea_store(struct mem_ctl_info *mci, const char *data,
+                                size_t count)
+{
+        struct amd64_pvt *pvt = mci->pvt_info;
+        unsigned long long value;
+        int ret = 0;
+
+        ret = strict_strtoull(data, 16, &value);
+        if (ret != -EINVAL) {
+                debugf0("received NBEA= 0x%llx\n", value);
+
+                /* place the value into the virtual error packet */
+                pvt->ctl_error_info.nbeal = (u32) value;
+                value >>= 32;
+                pvt->ctl_error_info.nbeah = (u32) value;
+
+                /* Process the Mapping request */
+                /* TODO: Add race prevention */
+                amd64_process_error_info(mci, &pvt->ctl_error_info, 1);
+
+                return count;
+        }
+        return ret;
+}
+
+/* display back what the last NBEA (MCA NB Address (MC4_ADDR)) was written */
+static ssize_t amd64_nbea_show(struct mem_ctl_info *mci, char *data)
+{
+        struct amd64_pvt *pvt = mci->pvt_info;
+        u64 value;
+
+        value = pvt->ctl_error_info.nbeah;
+        value <<= 32;
+        value |= pvt->ctl_error_info.nbeal;
+
+        return sprintf(data, "%llx\n", value);
+}
+
+/* store the NBSL (MCA NB Status Low (MC4_STATUS)) value user desires */
+static ssize_t amd64_nbsl_store(struct mem_ctl_info *mci, const char *data,
+                                size_t count)
+{
+        struct amd64_pvt *pvt = mci->pvt_info;
+        unsigned long value;
+        int ret = 0;
+
+        ret = strict_strtoul(data, 16, &value);
+        if (ret != -EINVAL) {
+                debugf0("received NBSL= 0x%lx\n", value);
+
+                pvt->ctl_error_info.nbsl = (u32) value;
+
+                return count;
+        }
+        return ret;
+}
+
+/* display back what the last NBSL value written */
+static ssize_t amd64_nbsl_show(struct mem_ctl_info *mci, char *data)
+{
+        struct amd64_pvt *pvt = mci->pvt_info;
+        u32 value;
+
+        value = pvt->ctl_error_info.nbsl;
+
+        return sprintf(data, "%x\n", value);
+}
+
+/* store the NBSH (MCA NB Status High) value user desires */
+static ssize_t amd64_nbsh_store(struct mem_ctl_info *mci, const char *data,
+                                size_t count)
+{
+        struct amd64_pvt *pvt = mci->pvt_info;
+        unsigned long value;
+        int ret = 0;
+
+        ret = strict_strtoul(data, 16, &value);
+        if (ret != -EINVAL) {
+                debugf0("received NBSH= 0x%lx\n", value);
+
+                pvt->ctl_error_info.nbsh = (u32) value;
+
+                return count;
+        }
+        return ret;
+}
+
+/* display back what the last NBSH value written */
+static ssize_t amd64_nbsh_show(struct mem_ctl_info *mci, char *data)
+{
+        struct amd64_pvt *pvt = mci->pvt_info;
+        u32 value;
+
+        value = pvt->ctl_error_info.nbsh;
+
+        return sprintf(data, "%x\n", value);
+}
+
+/* accept and store the NBCFG (MCA NB Configuration) value user desires */
+static ssize_t amd64_nbcfg_store(struct mem_ctl_info *mci,
+                                        const char *data, size_t count)
+{
+        struct amd64_pvt *pvt = mci->pvt_info;
+        unsigned long value;
+        int ret = 0;
+
+        ret = strict_strtoul(data, 16, &value);
+        if (ret != -EINVAL) {
+                debugf0("received NBCFG= 0x%lx\n", value);
+
+                pvt->ctl_error_info.nbcfg = (u32) value;
+
+                return count;
+        }
+        return ret;
+}
+
+/* various show routines for the controls of a MCI */
+static ssize_t amd64_nbcfg_show(struct mem_ctl_info *mci, char *data)
+{
+        struct amd64_pvt *pvt = mci->pvt_info;
+
+        return sprintf(data, "%x\n", pvt->ctl_error_info.nbcfg);
+}
+
+
+static ssize_t amd64_dhar_show(struct mem_ctl_info *mci, char *data)
+{
+        struct amd64_pvt *pvt = mci->pvt_info;
+
+        return sprintf(data, "%x\n", pvt->dhar);
+}
+
+
+static ssize_t amd64_dbam_show(struct mem_ctl_info *mci, char *data)
+{
+        struct amd64_pvt *pvt = mci->pvt_info;
+
+        return sprintf(data, "%x\n", pvt->dbam0);
+}
+
+
+static ssize_t amd64_topmem_show(struct mem_ctl_info *mci, char *data)
+{
+        struct amd64_pvt *pvt = mci->pvt_info;
+
+        return sprintf(data, "%llx\n", pvt->top_mem);
+}
+
+
+static ssize_t amd64_topmem2_show(struct mem_ctl_info *mci, char *data)
+{
+        struct amd64_pvt *pvt = mci->pvt_info;
+
+        return sprintf(data, "%llx\n", pvt->top_mem2);
+}
+
+static ssize_t amd64_hole_show(struct mem_ctl_info *mci, char *data)
+{
+        u64 hole_base = 0;
+        u64 hole_offset = 0;
+        u64 hole_size = 0;
+
+        amd64_get_dram_hole_info(mci, &hole_base, &hole_offset, &hole_size);
+
+        return sprintf(data, "%llx %llx %llx\n", hole_base, hole_offset,
+                                                 hole_size);
+}
+
+/*
+ * update NUM_DBG_ATTRS in case you add new members
+ */
+struct mcidev_sysfs_attribute amd64_dbg_attrs[] = {
+
+        {
+                .attr = {
+                        .name = "nbea_ctl",
+                        .mode = (S_IRUGO | S_IWUSR)
+                },
+                .show = amd64_nbea_show,
+                .store = amd64_nbea_store,
+        },
+        {
+                .attr = {
+                        .name = "nbsl_ctl",
+                        .mode = (S_IRUGO | S_IWUSR)
+                },
+                .show = amd64_nbsl_show,
+                .store = amd64_nbsl_store,
+        },
+        {
+                .attr = {
+                        .name = "nbsh_ctl",
+                        .mode = (S_IRUGO | S_IWUSR)
+                },
+                .show = amd64_nbsh_show,
+                .store = amd64_nbsh_store,
+        },
+        {
+                .attr = {
+                        .name = "nbcfg_ctl",
+                        .mode = (S_IRUGO | S_IWUSR)
+                },
+                .show = amd64_nbcfg_show,
+                .store = amd64_nbcfg_store,
+        },
+        {
+                .attr = {
+                        .name = "dhar",
+                        .mode = (S_IRUGO)
+                },
+                .show = amd64_dhar_show,
+                .store = NULL,
+        },
+        {
+                .attr = {
+                        .name = "dbam",
+                        .mode = (S_IRUGO)
+                },
+                .show = amd64_dbam_show,
+                .store = NULL,
+        },
+        {
+                .attr = {
+                        .name = "topmem",
+                        .mode = (S_IRUGO)
+                },
+                .show = amd64_topmem_show,
+                .store = NULL,
+        },
+        {
+                .attr = {
+                        .name = "topmem2",
+                        .mode = (S_IRUGO)
+                },
+                .show = amd64_topmem2_show,
+                .store = NULL,
+        },
+        {
+                .attr = {
+                        .name = "dram_hole",
+                        .mode = (S_IRUGO)
+                },
+                .show = amd64_hole_show,
+                .store = NULL,
+        },
+};