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
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@ -109,6 +109,13 @@ static inline bool is_hest_type_generic_v2(struct ghes *ghes)
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bool ghes_disable;
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module_param_named(disable, ghes_disable, bool, 0);
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/*
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* "ghes.edac_force_enable" forcibly enables ghes_edac and skips the platform
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* check.
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*/
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static bool ghes_edac_force_enable;
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module_param_named(edac_force_enable, ghes_edac_force_enable, bool, 0);
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/*
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* All error sources notified with HED (Hardware Error Device) share a
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* single notifier callback, so they need to be linked and checked one
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@ -120,6 +127,13 @@ module_param_named(disable, ghes_disable, bool, 0);
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static LIST_HEAD(ghes_hed);
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static DEFINE_MUTEX(ghes_list_mutex);
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/*
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* A list of GHES devices which are given to the corresponding EDAC driver
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* ghes_edac for further use.
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*/
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static LIST_HEAD(ghes_devs);
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static DEFINE_MUTEX(ghes_devs_mutex);
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/*
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* Because the memory area used to transfer hardware error information
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* from BIOS to Linux can be determined only in NMI, IRQ or timer
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@ -1380,6 +1394,12 @@ static int ghes_probe(struct platform_device *ghes_dev)
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ghes_edac_register(ghes, &ghes_dev->dev);
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ghes->dev = &ghes_dev->dev;
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mutex_lock(&ghes_devs_mutex);
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list_add_tail(&ghes->elist, &ghes_devs);
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mutex_unlock(&ghes_devs_mutex);
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/* Handle any pending errors right away */
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spin_lock_irqsave(&ghes_notify_lock_irq, flags);
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ghes_proc(ghes);
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@ -1444,6 +1464,10 @@ static int ghes_remove(struct platform_device *ghes_dev)
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ghes_edac_unregister(ghes);
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mutex_lock(&ghes_devs_mutex);
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list_del(&ghes->elist);
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mutex_unlock(&ghes_devs_mutex);
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kfree(ghes);
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platform_set_drvdata(ghes_dev, NULL);
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@ -1500,6 +1524,32 @@ void __init acpi_ghes_init(void)
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pr_info(GHES_PFX "Failed to enable APEI firmware first mode.\n");
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}
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/*
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* Known x86 systems that prefer GHES error reporting:
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*/
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static struct acpi_platform_list plat_list[] = {
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{"HPE ", "Server ", 0, ACPI_SIG_FADT, all_versions},
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{ } /* End */
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};
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struct list_head *ghes_get_devices(void)
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{
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int idx = -1;
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if (IS_ENABLED(CONFIG_X86)) {
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idx = acpi_match_platform_list(plat_list);
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if (idx < 0) {
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if (!ghes_edac_force_enable)
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return NULL;
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pr_warn_once("Force-loading ghes_edac on an unsupported platform. You're on your own!\n");
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}
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}
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return &ghes_devs;
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}
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EXPORT_SYMBOL_GPL(ghes_get_devices);
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void ghes_register_report_chain(struct notifier_block *nb)
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{
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atomic_notifier_chain_register(&ghes_report_chain, nb);
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@ -54,10 +54,6 @@ static DEFINE_MUTEX(ghes_reg_mutex);
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*/
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static DEFINE_SPINLOCK(ghes_lock);
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/* "ghes_edac.force_load=1" skips the platform check */
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static bool __read_mostly force_load;
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module_param(force_load, bool, 0);
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static bool system_scanned;
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/* Memory Device - Type 17 of SMBIOS spec */
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@ -387,14 +383,6 @@ static struct notifier_block ghes_edac_mem_err_nb = {
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.priority = 0,
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};
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/*
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* Known systems that are safe to enable this module.
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*/
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static struct acpi_platform_list plat_list[] = {
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{"HPE ", "Server ", 0, ACPI_SIG_FADT, all_versions},
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{ } /* End */
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};
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int ghes_edac_register(struct ghes *ghes, struct device *dev)
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{
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bool fake = false;
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@ -402,19 +390,8 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev)
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struct ghes_pvt *pvt;
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struct edac_mc_layer layers[1];
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unsigned long flags;
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int idx = -1;
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int rc = 0;
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if (IS_ENABLED(CONFIG_X86)) {
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/* Check if safe to enable on this system */
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idx = acpi_match_platform_list(plat_list);
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if (!force_load && idx < 0)
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return -ENODEV;
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} else {
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force_load = true;
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idx = 0;
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}
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/* finish another registration/unregistration instance first */
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mutex_lock(&ghes_reg_mutex);
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@ -458,15 +435,10 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev)
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pr_info("This system has a very crappy BIOS: It doesn't even list the DIMMS.\n");
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pr_info("Its SMBIOS info is wrong. It is doubtful that the error report would\n");
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pr_info("work on such system. Use this driver with caution\n");
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} else if (idx < 0) {
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pr_info("This EDAC driver relies on BIOS to enumerate memory and get error reports.\n");
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pr_info("Unfortunately, not all BIOSes reflect the memory layout correctly.\n");
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pr_info("So, the end result of using this driver varies from vendor to vendor.\n");
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pr_info("If you find incorrect reports, please contact your hardware vendor\n");
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pr_info("to correct its BIOS.\n");
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pr_info("This system has %d DIMM sockets.\n", ghes_hw.num_dimms);
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}
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pr_info("This system has %d DIMM sockets.\n", ghes_hw.num_dimms);
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if (!fake) {
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struct dimm_info *src, *dst;
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int i = 0;
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@ -535,9 +507,6 @@ void ghes_edac_unregister(struct ghes *ghes)
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struct mem_ctl_info *mci;
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unsigned long flags;
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if (!force_load)
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return;
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mutex_lock(&ghes_reg_mutex);
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system_scanned = false;
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@ -27,6 +27,8 @@ struct ghes {
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struct timer_list timer;
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unsigned int irq;
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};
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struct device *dev;
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struct list_head elist;
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};
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struct ghes_estatus_node {
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@ -80,6 +82,8 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev);
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void ghes_edac_unregister(struct ghes *ghes);
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struct list_head *ghes_get_devices(void);
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#else
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static inline int ghes_edac_register(struct ghes *ghes, struct device *dev)
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{
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@ -89,6 +93,8 @@ static inline int ghes_edac_register(struct ghes *ghes, struct device *dev)
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static inline void ghes_edac_unregister(struct ghes *ghes)
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{
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}
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static inline struct list_head *ghes_get_devices(void) { return NULL; }
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#endif
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static inline int acpi_hest_get_version(struct acpi_hest_generic_data *gdata)
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