summaryrefslogtreecommitdiffstats
path: root/drivers/edac
diff options
context:
space:
mode:
authorDoug Thompson <dougthompson@xmission.com>2009-05-05 20:07:11 +0200
committerBorislav Petkov <borislav.petkov@amd.com>2009-06-10 12:18:47 +0200
commiteb919690be994386eac326f8c53c4540602de563 (patch)
tree7d46ff20169bbec1221172895f2f066ef5d134ae /drivers/edac
parentfd3d6780f7358225a6ea1ffb1bb8fd8b2d6df446 (diff)
downloadop-kernel-dev-eb919690be994386eac326f8c53c4540602de563.zip
op-kernel-dev-eb919690be994386eac326f8c53c4540602de563.tar.gz
amd64_edac: add DRAM error injection logic using sysfs
Borislav: - rename sysfs attrs to more conform names - cleanup/fix comments according to BKDG text - 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>
Diffstat (limited to 'drivers/edac')
-rw-r--r--drivers/edac/amd64_edac_inj.c185
1 files changed, 185 insertions, 0 deletions
diff --git a/drivers/edac/amd64_edac_inj.c b/drivers/edac/amd64_edac_inj.c
new file mode 100644
index 0000000..d3675b7
--- /dev/null
+++ b/drivers/edac/amd64_edac_inj.c
@@ -0,0 +1,185 @@
+#include "amd64_edac.h"
+
+/*
+ * store error injection section value which refers to one of 4 16-byte sections
+ * within a 64-byte cacheline
+ *
+ * range: 0..3
+ */
+static ssize_t amd64_inject_section_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, 10, &value);
+ if (ret != -EINVAL) {
+ pvt->injection.section = (u32) value;
+ return count;
+ }
+ return ret;
+}
+
+/*
+ * store error injection word value which refers to one of 9 16-bit word of the
+ * 16-byte (128-bit + ECC bits) section
+ *
+ * range: 0..8
+ */
+static ssize_t amd64_inject_word_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, 10, &value);
+ if (ret != -EINVAL) {
+
+ value = (value <= 8) ? value : 0;
+ pvt->injection.word = (u32) value;
+
+ return count;
+ }
+ return ret;
+}
+
+/*
+ * store 16 bit error injection vector which enables injecting errors to the
+ * corresponding bit within the error injection word above. When used during a
+ * DRAM ECC read, it holds the contents of the of the DRAM ECC bits.
+ */
+static ssize_t amd64_inject_ecc_vector_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) {
+
+ pvt->injection.bit_map = (u32) value & 0xFFFF;
+
+ return count;
+ }
+ return ret;
+}
+
+/*
+ * Do a DRAM ECC read. Assemble staged values in the pvt area, format into
+ * fields needed by the injection registers and read the NB Array Data Port.
+ */
+static ssize_t amd64_inject_read_store(struct mem_ctl_info *mci,
+ const char *data, size_t count)
+{
+ struct amd64_pvt *pvt = mci->pvt_info;
+ unsigned long value;
+ u32 section, word_bits;
+ int ret = 0;
+
+ ret = strict_strtoul(data, 10, &value);
+ if (ret != -EINVAL) {
+
+ /* Form value to choose 16-byte section of cacheline */
+ section = F10_NB_ARRAY_DRAM_ECC |
+ SET_NB_ARRAY_ADDRESS(pvt->injection.section);
+ pci_write_config_dword(pvt->misc_f3_ctl,
+ F10_NB_ARRAY_ADDR, section);
+
+ word_bits = SET_NB_DRAM_INJECTION_READ(pvt->injection.word,
+ pvt->injection.bit_map);
+
+ /* Issue 'word' and 'bit' along with the READ request */
+ pci_write_config_dword(pvt->misc_f3_ctl,
+ F10_NB_ARRAY_DATA, word_bits);
+
+ debugf0("section=0x%x word_bits=0x%x\n", section, word_bits);
+
+ return count;
+ }
+ return ret;
+}
+
+/*
+ * Do a DRAM ECC write. Assemble staged values in the pvt area and format into
+ * fields needed by the injection registers.
+ */
+static ssize_t amd64_inject_write_store(struct mem_ctl_info *mci,
+ const char *data, size_t count)
+{
+ struct amd64_pvt *pvt = mci->pvt_info;
+ unsigned long value;
+ u32 section, word_bits;
+ int ret = 0;
+
+ ret = strict_strtoul(data, 10, &value);
+ if (ret != -EINVAL) {
+
+ /* Form value to choose 16-byte section of cacheline */
+ section = F10_NB_ARRAY_DRAM_ECC |
+ SET_NB_ARRAY_ADDRESS(pvt->injection.section);
+ pci_write_config_dword(pvt->misc_f3_ctl,
+ F10_NB_ARRAY_ADDR, section);
+
+ word_bits = SET_NB_DRAM_INJECTION_WRITE(pvt->injection.word,
+ pvt->injection.bit_map);
+
+ /* Issue 'word' and 'bit' along with the READ request */
+ pci_write_config_dword(pvt->misc_f3_ctl,
+ F10_NB_ARRAY_DATA, word_bits);
+
+ debugf0("section=0x%x word_bits=0x%x\n", section, word_bits);
+
+ return count;
+ }
+ return ret;
+}
+
+/*
+ * update NUM_INJ_ATTRS in case you add new members
+ */
+struct mcidev_sysfs_attribute amd64_inj_attrs[] = {
+
+ {
+ .attr = {
+ .name = "inject_section",
+ .mode = (S_IRUGO | S_IWUSR)
+ },
+ .show = NULL,
+ .store = amd64_inject_section_store,
+ },
+ {
+ .attr = {
+ .name = "inject_word",
+ .mode = (S_IRUGO | S_IWUSR)
+ },
+ .show = NULL,
+ .store = amd64_inject_word_store,
+ },
+ {
+ .attr = {
+ .name = "inject_ecc_vector",
+ .mode = (S_IRUGO | S_IWUSR)
+ },
+ .show = NULL,
+ .store = amd64_inject_ecc_vector_store,
+ },
+ {
+ .attr = {
+ .name = "inject_write",
+ .mode = (S_IRUGO | S_IWUSR)
+ },
+ .show = NULL,
+ .store = amd64_inject_write_store,
+ },
+ {
+ .attr = {
+ .name = "inject_read",
+ .mode = (S_IRUGO | S_IWUSR)
+ },
+ .show = NULL,
+ .store = amd64_inject_read_store,
+ },
+};
OpenPOWER on IntegriCloud