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Subject[PATCH v7 4/8] ghes: Introduce a helper ghes_get_devices()
Date
Introduce a helper ghes_get_devices(), which returns the dev list GHES
probed when the platform-check passes on the system.

Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Jia He <justin.he@arm.com>
---
drivers/acpi/apei/ghes.c | 37 +++++++++++++++++++++++++++++++++++++
include/acpi/ghes.h | 6 ++++++
2 files changed, 43 insertions(+)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index b0a6445c6da2..cc0588fe20f5 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -128,6 +128,9 @@ module_param_named(edac_force_enable, ghes_edac_force_enable, bool, 0);
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
@@ -1388,6 +1391,10 @@ static int ghes_probe(struct platform_device *ghes_dev)

ghes_edac_register(ghes, &ghes_dev->dev);

+ mutex_lock(&ghes_devs_mutex);
+ list_add_tail(&ghes->elist, &ghes_devs);
+ mutex_unlock(&ghes_devs_mutex);
+
/* Handle any pending errors right away */
spin_lock_irqsave(&ghes_notify_lock_irq, flags);
ghes_proc(ghes);
@@ -1452,6 +1459,10 @@ static int ghes_remove(struct platform_device *ghes_dev)

ghes_edac_unregister(ghes);

+ mutex_lock(&ghes_devs_mutex);
+ list_del(&ghes->elist);
+ mutex_unlock(&ghes_devs_mutex);
+
kfree(ghes);

platform_set_drvdata(ghes_dev, NULL);
@@ -1508,6 +1519,32 @@ void __init acpi_ghes_init(void)
pr_info(GHES_PFX "Failed to enable APEI firmware first mode.\n");
}

+/*
+ * Known x86 systems that prefer GHES error reporting:
+ */
+static struct acpi_platform_list plat_list[] = {
+ {"HPE ", "Server ", 0, ACPI_SIG_FADT, all_versions},
+ { } /* End */
+};
+
+struct list_head *ghes_get_devices(void)
+{
+ int idx = -1;
+
+ if (IS_ENABLED(CONFIG_X86)) {
+ idx = acpi_match_platform_list(plat_list);
+ if (idx < 0) {
+ if (!ghes_edac_force_enable)
+ return NULL;
+
+ pr_warn_once("Force-loading ghes_edac on an unsupported platform. You're on your own!\n");
+ }
+ }
+
+ 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/include/acpi/ghes.h b/include/acpi/ghes.h
index 5cbd38b6e4e1..46d9c86199e9 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 {
@@ -69,6 +71,10 @@ 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);
+
+struct list_head *ghes_get_devices(void);
+#else
+static inline struct list_head *ghes_get_devices(void) { return NULL; }
#endif

int ghes_estatus_pool_init(int num_ghes);
--
2.25.1
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