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EDAC/ghes: Prepare to make ghes_edac a proper module 

To make ghes_edac a proper module, prepare to decouple its dependencies
from GHES.

Move the ghes_edac.force_load parameter to ghes.c in order to
properly control whether ghes_edac should be force-loaded: In
ghes_edac_register() it is too late to set the module flag.

Introduce a helper ghes_get_devices(), which returns the list of GHES
devices which got probed when the platform-check passes on the system.

The previous force_load check is not needed in ghes_edac_unregister()
since it will be checked in the module's init function of ghes_edac
later.

  [ bp: Massage. ]

Suggested-by: Toshi Kani <toshi.kani@hpe.com>
Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Jia He <justin.he@arm.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20221010023559.69655-4-justin.he@arm.com
This commit is contained in:
Jia He 2022-10-10 02:35:55 +00:00 committed by Borislav Petkov
parent 8e40612f61
commit 9057a3f7ac
3 changed files with 58 additions and 33 deletions
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50
drivers/acpi/apei/ghes.c
View File

@ -109,6 +109,13 @@ static inline bool is_hest_type_generic_v2(struct ghes *ghes)
bool ghes_disable;
module_param_named(disable, ghes_disable, bool, 0);
/*
* "ghes.edac_force_enable" forcibly enables ghes_edac and skips the platform
* check.
*/
static bool ghes_edac_force_enable;
module_param_named(edac_force_enable, ghes_edac_force_enable, bool, 0);
/*
* All error sources notified with HED (Hardware Error Device) share a
* single notifier callback, so they need to be linked and checked one
@ -120,6 +127,13 @@ module_param_named(disable, ghes_disable, bool, 0);
static LIST_HEAD(ghes_hed);
static DEFINE_MUTEX(ghes_list_mutex);
/*
* A list of GHES devices which are given to the corresponding EDAC driver
* ghes_edac for further use.
*/
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
@ -1380,6 +1394,12 @@ static int ghes_probe(struct platform_device *ghes_dev)
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);
/* Handle any pending errors right away */
spin_lock_irqsave(&ghes_notify_lock_irq, flags);
ghes_proc(ghes);
@ -1444,6 +1464,10 @@ 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);
@ -1500,6 +1524,32 @@ 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);

35
drivers/edac/ghes_edac.c
View File

@ -54,10 +54,6 @@ static DEFINE_MUTEX(ghes_reg_mutex);
*/
static DEFINE_SPINLOCK(ghes_lock);
/* "ghes_edac.force_load=1" skips the platform check */
static bool __read_mostly force_load;
module_param(force_load, bool, 0);
static bool system_scanned;
/* Memory Device - Type 17 of SMBIOS spec */
@ -387,14 +383,6 @@ 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)
{
bool fake = false;
@ -402,19 +390,8 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev)
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 (!force_load && idx < 0)
return -ENODEV;
} else {
force_load = true;
idx = 0;
}
/* finish another registration/unregistration instance first */
mutex_lock(&ghes_reg_mutex);
@ -458,15 +435,10 @@ 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) {
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", ghes_hw.num_dimms);
}
pr_info("This system has %d DIMM sockets.\n", ghes_hw.num_dimms);
if (!fake) {
struct dimm_info *src, *dst;
int i = 0;
@ -535,9 +507,6 @@ void ghes_edac_unregister(struct ghes *ghes)
struct mem_ctl_info *mci;
unsigned long flags;
if (!force_load)
return;
mutex_lock(&ghes_reg_mutex);
system_scanned = false;

6
include/acpi/ghes.h
View File

@ -27,6 +27,8 @@ struct ghes {
struct timer_list timer;
unsigned int irq;
};
struct device *dev;
struct list_head elist;
};
struct ghes_estatus_node {
@ -80,6 +82,8 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev);
void ghes_edac_unregister(struct ghes *ghes);
struct list_head *ghes_get_devices(void);
#else
static inline int ghes_edac_register(struct ghes *ghes, struct device *dev)
{
@ -89,6 +93,8 @@ static inline int ghes_edac_register(struct ghes *ghes, struct device *dev)
static inline void ghes_edac_unregister(struct ghes *ghes)
{
}
static inline struct list_head *ghes_get_devices(void) { return NULL; }
#endif
static inline int acpi_hest_get_version(struct acpi_hest_generic_data *gdata)