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Message-Id: <20220831074027.13849-6-justin.he@arm.com>
Date: Wed, 31 Aug 2022 07:40:24 +0000
From: Jia He <justin.he@....com>
To: Len Brown <lenb@...nel.org>, James Morse <james.morse@....com>,
Tony Luck <tony.luck@...el.com>,
Borislav Petkov <bp@...en8.de>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Robert Richter <rric@...nel.org>,
Robert Moore <robert.moore@...el.com>,
Qiuxu Zhuo <qiuxu.zhuo@...el.com>,
Yazen Ghannam <yazen.ghannam@....com>,
Jan Luebbe <jlu@...gutronix.de>,
Khuong Dinh <khuong@...amperecomputing.com>,
Kani Toshi <toshi.kani@....com>
Cc: Ard Biesheuvel <ardb@...nel.org>, linux-acpi@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-edac@...r.kernel.org,
devel@...ica.org, "Rafael J . Wysocki" <rafael@...nel.org>,
Shuai Xue <xueshuai@...ux.alibaba.com>,
Jarkko Sakkinen <jarkko@...nel.org>, linux-efi@...r.kernel.org,
nd@....com, Jia He <justin.he@....com>
Subject: [PATCH v4 5/8] EDAC/ghes: Make ghes_edac a proper module to remove the dependency on ghes
Commit dc4e8c07e9e2 ("ACPI: APEI: explicit init of HEST and GHES in
apci_init()") introduced a bug that ghes_edac_register() would be invoked
before edac_init(). Because at that time, the bus "edac" hadn't been even
registered, this created sysfs /devices/mc0 instead of
/sys/devices/system/edac/mc/mc0 on an Ampere eMag server.
To remove the dependency of ghes_edac on ghes, make it a proper module. Use
a list to save the probing devices in ghes_probe(), and defer the
ghes_edac_register() to module_init() of the new ghes_edac module by
iterating over the devices list.
Co-developed-by: Borislav Petkov <bp@...en8.de>
Signed-off-by: Borislav Petkov <bp@...en8.de>
Signed-off-by: Jia He <justin.he@....com>
Fixes: dc4e8c07e9e2 ("ACPI: APEI: explicit init of HEST and GHES in apci_init()")
Cc: Shuai Xue <xueshuai@...ux.alibaba.com>
---
drivers/acpi/apei/ghes.c | 22 ++++++++++++++--
drivers/edac/Kconfig | 4 +--
drivers/edac/ghes_edac.c | 56 ++++++++++++++++++++++++----------------
include/acpi/ghes.h | 24 +++++------------
4 files changed, 62 insertions(+), 44 deletions(-)
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index d798a58fbbd9..d11e3b2e5345 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -130,6 +130,9 @@ static bool ghes_present;
static LIST_HEAD(ghes_hed);
static DEFINE_MUTEX(ghes_list_mutex);
+static LIST_HEAD(ghes_devs);
+static DEFINE_MUTEX(ghes_devs_mutex);
+
/*
* Because the memory area used to transfer hardware error information
* from BIOS to Linux can be determined only in NMI, IRQ or timer
@@ -1388,7 +1391,11 @@ static int ghes_probe(struct platform_device *ghes_dev)
platform_set_drvdata(ghes_dev, ghes);
- ghes_edac_register(ghes, &ghes_dev->dev);
+ ghes->dev = &ghes_dev->dev;
+
+ mutex_lock(&ghes_devs_mutex);
+ list_add_tail(&ghes->elist, &ghes_devs);
+ mutex_unlock(&ghes_devs_mutex);
ghes_present = true;
@@ -1454,7 +1461,9 @@ static int ghes_remove(struct platform_device *ghes_dev)
ghes_fini(ghes);
- ghes_edac_unregister(ghes);
+ mutex_lock(&ghes_devs_mutex);
+ list_del(&ghes->elist);
+ mutex_unlock(&ghes_devs_mutex);
kfree(ghes);
@@ -1540,6 +1549,15 @@ bool ghes_edac_preferred(void)
}
EXPORT_SYMBOL_GPL(ghes_edac_preferred);
+struct list_head *ghes_get_devices(void)
+{
+ if (!ghes_edac_preferred())
+ return NULL;
+
+ return &ghes_devs;
+}
+EXPORT_SYMBOL_GPL(ghes_get_devices);
+
void ghes_register_report_chain(struct notifier_block *nb)
{
atomic_notifier_chain_register(&ghes_report_chain, nb);
diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
index 17562cf1fe97..df45db81858b 100644
--- a/drivers/edac/Kconfig
+++ b/drivers/edac/Kconfig
@@ -53,8 +53,8 @@ config EDAC_DECODE_MCE
has been initialized.
config EDAC_GHES
- bool "Output ACPI APEI/GHES BIOS detected errors via EDAC"
- depends on ACPI_APEI_GHES && (EDAC=y)
+ tristate "Output ACPI APEI/GHES BIOS detected errors via EDAC"
+ depends on ACPI_APEI_GHES
select UEFI_CPER
help
Not all machines support hardware-driven error report. Some of those
diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c
index f716d5d8f1df..ec654222e227 100644
--- a/drivers/edac/ghes_edac.c
+++ b/drivers/edac/ghes_edac.c
@@ -56,6 +56,8 @@ static DEFINE_SPINLOCK(ghes_lock);
static bool system_scanned;
+static struct list_head *ghes_devs;
+
/* Memory Device - Type 17 of SMBIOS spec */
struct memdev_dmi_entry {
u8 type;
@@ -383,34 +385,15 @@ static struct notifier_block ghes_edac_mem_err_nb = {
.priority = 0,
};
-/*
- * Known systems that are safe to enable this module.
- */
-static struct acpi_platform_list plat_list[] = {
- {"HPE ", "Server ", 0, ACPI_SIG_FADT, all_versions},
- { } /* End */
-};
-
-int ghes_edac_register(struct ghes *ghes, struct device *dev)
+static int ghes_edac_register(struct device *dev)
{
bool fake = false;
struct mem_ctl_info *mci;
struct ghes_pvt *pvt;
struct edac_mc_layer layers[1];
unsigned long flags;
- int idx = -1;
int rc = 0;
- if (IS_ENABLED(CONFIG_X86)) {
- /* Check if safe to enable on this system */
- idx = acpi_match_platform_list(plat_list);
- if (!ghes_edac_force_load && idx < 0)
- return -ENODEV;
- } else {
- ghes_edac_force_load = true;
- idx = 0;
- }
-
/* finish another registration/unregistration instance first */
mutex_lock(&ghes_reg_mutex);
@@ -454,7 +437,7 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev)
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");
- } else if (idx < 0) {
+ } else if (ghes_edac_force_load) {
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");
@@ -526,7 +509,7 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev)
return rc;
}
-void ghes_edac_unregister(struct ghes *ghes)
+static void ghes_edac_unregister(struct ghes *ghes)
{
struct mem_ctl_info *mci;
unsigned long flags;
@@ -562,3 +545,32 @@ void ghes_edac_unregister(struct ghes *ghes)
unlock:
mutex_unlock(&ghes_reg_mutex);
}
+
+static int __init ghes_edac_init(void)
+{
+ struct ghes *g, *g_tmp;
+
+ ghes_devs = ghes_get_devices();
+ if (!ghes_devs)
+ return -ENODEV;
+
+ list_for_each_entry_safe(g, g_tmp, ghes_devs, elist) {
+ ghes_edac_register(g->dev);
+ }
+
+ return 0;
+}
+module_init(ghes_edac_init);
+
+static void __exit ghes_edac_exit(void)
+{
+ struct ghes *g, *g_tmp;
+
+ list_for_each_entry_safe(g, g_tmp, ghes_devs, elist) {
+ ghes_edac_unregister(g);
+ }
+}
+module_exit(ghes_edac_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Output ACPI APEI/GHES BIOS detected errors module via EDAC");
diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
index 7ce91c0ff3eb..08f12dde99ae 100644
--- a/include/acpi/ghes.h
+++ b/include/acpi/ghes.h
@@ -27,6 +27,8 @@ struct ghes {
struct timer_list timer;
unsigned int irq;
};
+ struct device *dev;
+ struct list_head elist;
};
struct ghes_estatus_node {
@@ -69,30 +71,16 @@ int ghes_register_vendor_record_notifier(struct notifier_block *nb);
* @nb: pointer to the notifier_block structure of the vendor record handler.
*/
void ghes_unregister_vendor_record_notifier(struct notifier_block *nb);
-#endif
-
-int ghes_estatus_pool_init(int num_ghes);
-
-/* From drivers/edac/ghes_edac.c */
-
-#ifdef CONFIG_EDAC_GHES
-int ghes_edac_register(struct ghes *ghes, struct device *dev);
-
-void ghes_edac_unregister(struct ghes *ghes);
+struct list_head *ghes_get_devices(void);
bool ghes_edac_preferred(void);
#else
-static inline int ghes_edac_register(struct ghes *ghes, struct device *dev)
-{
- return -ENODEV;
-}
-
-static inline void ghes_edac_unregister(struct ghes *ghes)
-{
-}
+static inline struct list_head *ghes_get_devices(void) { return NULL; }
static bool ghes_edac_preferred(void) { return false; }
#endif
+int ghes_estatus_pool_init(int num_ghes);
+
static inline int acpi_hest_get_version(struct acpi_hest_generic_data *gdata)
{
return gdata->revision >> 8;
--
2.25.1
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