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authorBorislav Petkov <borislav.petkov@amd.com>2009-09-24 11:05:30 +0200
committerBorislav Petkov <borislav.petkov@amd.com>2009-10-07 16:51:28 +0200
commit94baaee4947d84809b289d5ca03677525ffc6da9 (patch)
tree61134e2d9fc2e639d4dfc4ec50f90730d2f21f75 /drivers/edac/amd64_edac_inj.c
parent66216a7a15e75d517dddd0ac6514924b15071e4c (diff)
amd64_edac: beef up DRAM error injection
When injecting DRAM ECC errors (F3xBC_x8), EccVector[15:0] is a bitmask of which bits should be error injected when written to and holds the payload of 16-bit DRAM word when read, respectively. Add /sysfs members to show the DRAM ECC section/word/vector. Fail wrong injection values entered over /sysfs instead of truncating them. Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Diffstat (limited to 'drivers/edac/amd64_edac_inj.c')
-rw-r--r--drivers/edac/amd64_edac_inj.c49
1 files changed, 43 insertions, 6 deletions
diff --git a/drivers/edac/amd64_edac_inj.c b/drivers/edac/amd64_edac_inj.c
index d3675b76b3a..29f1f7a612d 100644
--- a/drivers/edac/amd64_edac_inj.c
+++ b/drivers/edac/amd64_edac_inj.c
@@ -1,5 +1,11 @@
#include "amd64_edac.h"
+static ssize_t amd64_inject_section_show(struct mem_ctl_info *mci, char *buf)
+{
+ struct amd64_pvt *pvt = mci->pvt_info;
+ return sprintf(buf, "0x%x\n", pvt->injection.section);
+}
+
/*
* store error injection section value which refers to one of 4 16-byte sections
* within a 64-byte cacheline
@@ -15,12 +21,26 @@ static ssize_t amd64_inject_section_store(struct mem_ctl_info *mci,
ret = strict_strtoul(data, 10, &value);
if (ret != -EINVAL) {
+
+ if (value > 3) {
+ amd64_printk(KERN_WARNING,
+ "%s: invalid section 0x%lx\n",
+ __func__, value);
+ return -EINVAL;
+ }
+
pvt->injection.section = (u32) value;
return count;
}
return ret;
}
+static ssize_t amd64_inject_word_show(struct mem_ctl_info *mci, char *buf)
+{
+ struct amd64_pvt *pvt = mci->pvt_info;
+ return sprintf(buf, "0x%x\n", pvt->injection.word);
+}
+
/*
* store error injection word value which refers to one of 9 16-bit word of the
* 16-byte (128-bit + ECC bits) section
@@ -37,14 +57,25 @@ static ssize_t amd64_inject_word_store(struct mem_ctl_info *mci,
ret = strict_strtoul(data, 10, &value);
if (ret != -EINVAL) {
- value = (value <= 8) ? value : 0;
- pvt->injection.word = (u32) value;
+ if (value > 8) {
+ amd64_printk(KERN_WARNING,
+ "%s: invalid word 0x%lx\n",
+ __func__, value);
+ return -EINVAL;
+ }
+ pvt->injection.word = (u32) value;
return count;
}
return ret;
}
+static ssize_t amd64_inject_ecc_vector_show(struct mem_ctl_info *mci, char *buf)
+{
+ struct amd64_pvt *pvt = mci->pvt_info;
+ return sprintf(buf, "0x%x\n", pvt->injection.bit_map);
+}
+
/*
* store 16 bit error injection vector which enables injecting errors to the
* corresponding bit within the error injection word above. When used during a
@@ -60,8 +91,14 @@ static ssize_t amd64_inject_ecc_vector_store(struct mem_ctl_info *mci,
ret = strict_strtoul(data, 16, &value);
if (ret != -EINVAL) {
- pvt->injection.bit_map = (u32) value & 0xFFFF;
+ if (value & 0xFFFF0000) {
+ amd64_printk(KERN_WARNING,
+ "%s: invalid EccVector: 0x%lx\n",
+ __func__, value);
+ return -EINVAL;
+ }
+ pvt->injection.bit_map = (u32) value;
return count;
}
return ret;
@@ -147,7 +184,7 @@ struct mcidev_sysfs_attribute amd64_inj_attrs[] = {
.name = "inject_section",
.mode = (S_IRUGO | S_IWUSR)
},
- .show = NULL,
+ .show = amd64_inject_section_show,
.store = amd64_inject_section_store,
},
{
@@ -155,7 +192,7 @@ struct mcidev_sysfs_attribute amd64_inj_attrs[] = {
.name = "inject_word",
.mode = (S_IRUGO | S_IWUSR)
},
- .show = NULL,
+ .show = amd64_inject_word_show,
.store = amd64_inject_word_store,
},
{
@@ -163,7 +200,7 @@ struct mcidev_sysfs_attribute amd64_inj_attrs[] = {
.name = "inject_ecc_vector",
.mode = (S_IRUGO | S_IWUSR)
},
- .show = NULL,
+ .show = amd64_inject_ecc_vector_show,
.store = amd64_inject_ecc_vector_store,
},
{