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
diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c
index fb86680..b4acc4f 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 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 @@
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 @@
*/
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 @@
* 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 @@
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 @@
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 @@
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;
