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authorMauro Carvalho Chehab <mchehab@redhat.com>2013-02-15 16:06:38 +0400
committerMauro Carvalho Chehab <mchehab@redhat.com>2013-02-26 02:42:15 +0400
commitd2a6856614fd34e36352146307a5655efbdbc14d (patch)
treeeafad59b7e82e3da7622dcbf5233c5482bbcf3bf /drivers/edac/ghes_edac.c
parent5ee726db521fddf991f261e5c45e04a7d2bf1bc1 (diff)
downloadlinux-d2a6856614fd34e36352146307a5655efbdbc14d.tar.xz
ghes_edac: Improve driver's printk messages
Provide a better infrastructure for printk's inside the driver: - use edac_dbg() for debug messages; - standardize the usage of pr_info(); - provide warning about the risk of relying on this driver. While here, changes the size of a fake memory to 1 page. This is as good or as bad as 1000 pages, but it is easier for userspace to detect, as I don't expect that any machine implementing GHES would provide just 1 page available ;) Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com> Conflicts: drivers/edac/ghes_edac.c
Diffstat (limited to 'drivers/edac/ghes_edac.c')
-rw-r--r--drivers/edac/ghes_edac.c36
1 files changed, 26 insertions, 10 deletions
diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c
index fb866804820c..b4acc4f2074d 100644
--- a/drivers/edac/ghes_edac.c
+++ b/drivers/edac/ghes_edac.c
@@ -9,12 +9,13 @@
* Red Hat Inc. http://www.redhat.com
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <acpi/ghes.h>
#include <linux/edac.h>
#include <linux/dmi.h>
#include "edac_core.h"
-#define GHES_PFX "ghes_edac: "
#define GHES_EDAC_REVISION " Ver: 1.0.0"
struct ghes_edac_pvt {
@@ -27,6 +28,7 @@ static LIST_HEAD(ghes_reglist);
static DEFINE_MUTEX(ghes_edac_lock);
static int ghes_edac_mc_num;
+
/* Memory Device - Type 17 of SMBIOS spec */
struct memdev_dmi_entry {
u8 type;
@@ -98,7 +100,8 @@ static void ghes_edac_dmidecode(const struct dmi_header *dh, void *arg)
dimm_fill->count, 0, 0);
if (entry->size == 0xffff) {
- pr_info(GHES_PFX "Can't get dimm size\n");
+ pr_info("Can't get DIMM%i size\n",
+ dimm_fill->count);
dimm->nr_pages = MiB_TO_PAGES(32);/* Unknown */
} else if (entry->size == 0x7fff) {
dimm->nr_pages = MiB_TO_PAGES(entry->extended_size);
@@ -163,11 +166,11 @@ static void ghes_edac_dmidecode(const struct dmi_header *dh, void *arg)
*/
if (dimm->nr_pages) {
- pr_info(GHES_PFX "DIMM%i: %s size = %d MB%s\n",
+ edac_dbg(1, "DIMM%i: %s size = %d MB%s\n",
dimm_fill->count, memory_type[dimm->mtype],
PAGES_TO_MiB(dimm->nr_pages),
(dimm->edac_mode != EDAC_NONE) ? "(ECC)" : "");
- pr_info(GHES_PFX "\ttype %d, detail 0x%02x, width %d(total %d)\n",
+ edac_dbg(2, "\ttype %d, detail 0x%02x, width %d(total %d)\n",
entry->memory_type, entry->type_detail,
entry->total_width, entry->data_width);
}
@@ -261,12 +264,10 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev)
* to avoid duplicated memory controller numbers
*/
mutex_lock(&ghes_edac_lock);
- pr_info("ghes_edac#%d: allocating space for %d dimms\n",
- ghes_edac_mc_num, num_dimm);
mci = edac_mc_alloc(ghes_edac_mc_num, ARRAY_SIZE(layers), layers,
sizeof(*pvt));
if (!mci) {
- pr_info(GHES_PFX "Can't allocate memory for EDAC data\n");
+ pr_info("Can't allocate memory for EDAC data\n");
mutex_unlock(&ghes_edac_lock);
return -ENOMEM;
}
@@ -286,6 +287,22 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev)
mci->ctl_name = "ghes_edac";
mci->dev_name = "ghes";
+ if (!ghes_edac_mc_num) {
+ if (!fake) {
+ pr_info("This EDAC driver relies on BIOS to enumerate memory and get error reports.\n");
+ pr_info("Unfortunately, not all BIOSes reflect the memory layout correctly.\n");
+ pr_info("So, the end result of using this driver varies from vendor to vendor.\n");
+ pr_info("If you find incorrect reports, please contact your hardware vendor\n");
+ pr_info("to correct its BIOS.\n");
+ pr_info("This system has %d DIMM sockets.\n",
+ num_dimm);
+ } else {
+ pr_info("This system has a very crappy BIOS: It doesn't even list the DIMMS.\n");
+ pr_info("Its SMBIOS info is wrong. It is doubtful that the error report would\n");
+ pr_info("work on such system. Use this driver with caution\n");
+ }
+ }
+
if (!fake) {
/*
* Fill DIMM info from DMI for the memory controller #0
@@ -304,8 +321,7 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev)
struct dimm_info *dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms,
mci->n_layers, 0, 0, 0);
- pr_info(GHES_PFX "Crappy BIOS detected. Faking DIMM EDAC data\n");
- dimm->nr_pages = 1000;
+ dimm->nr_pages = 1;
dimm->grain = 128;
dimm->mtype = MEM_UNKNOWN;
dimm->dtype = DEV_UNKNOWN;
@@ -314,7 +330,7 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev)
rc = edac_mc_add_mc(mci);
if (rc < 0) {
- pr_info(GHES_PFX "Can't register at EDAC core\n");
+ pr_info("Can't register at EDAC core\n");
edac_mc_free(mci);
mutex_unlock(&ghes_edac_lock);
return -ENODEV;