diff options
Diffstat (limited to 'drivers/acpi/apei/ghes.c')
| -rw-r--r-- | drivers/acpi/apei/ghes.c | 67 |
1 files changed, 56 insertions, 11 deletions
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c index aabe9c5ee515..81bf71b10d44 100644 --- a/drivers/acpi/apei/ghes.c +++ b/drivers/acpi/apei/ghes.c @@ -40,6 +40,7 @@ #include <linux/sched/clock.h> #include <linux/uuid.h> #include <linux/ras.h> +#include <linux/task_work.h> #include <acpi/actbl1.h> #include <acpi/ghes.h> @@ -408,23 +409,46 @@ static void ghes_clear_estatus(struct ghes *ghes, ghes_ack_error(ghes->generic_v2); } -static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int sev) +/* + * Called as task_work before returning to user-space. + * Ensure any queued work has been done before we return to the context that + * triggered the notification. + */ +static void ghes_kick_task_work(struct callback_head *head) +{ + struct acpi_hest_generic_status *estatus; + struct ghes_estatus_node *estatus_node; + u32 node_len; + + estatus_node = container_of(head, struct ghes_estatus_node, task_work); + if (IS_ENABLED(CONFIG_ACPI_APEI_MEMORY_FAILURE)) + memory_failure_queue_kick(estatus_node->task_work_cpu); + + estatus = GHES_ESTATUS_FROM_NODE(estatus_node); + node_len = GHES_ESTATUS_NODE_LEN(cper_estatus_len(estatus)); + gen_pool_free(ghes_estatus_pool, (unsigned long)estatus_node, node_len); +} + +static bool ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, + int sev) { -#ifdef CONFIG_ACPI_APEI_MEMORY_FAILURE unsigned long pfn; int flags = -1; int sec_sev = ghes_severity(gdata->error_severity); struct cper_sec_mem_err *mem_err = acpi_hest_get_payload(gdata); + if (!IS_ENABLED(CONFIG_ACPI_APEI_MEMORY_FAILURE)) + return false; + if (!(mem_err->validation_bits & CPER_MEM_VALID_PA)) - return; + return false; pfn = mem_err->physical_addr >> PAGE_SHIFT; if (!pfn_valid(pfn)) { pr_warn_ratelimited(FW_WARN GHES_PFX "Invalid address in generic error data: %#llx\n", mem_err->physical_addr); - return; + return false; } /* iff following two events can be handled properly by now */ @@ -434,9 +458,12 @@ static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int if (sev == GHES_SEV_RECOVERABLE && sec_sev == GHES_SEV_RECOVERABLE) flags = 0; - if (flags != -1) + if (flags != -1) { memory_failure_queue(pfn, flags); -#endif + return true; + } + + return false; } /* @@ -484,7 +511,7 @@ static void ghes_handle_aer(struct acpi_hest_generic_data *gdata) #endif } -static void ghes_do_proc(struct ghes *ghes, +static bool ghes_do_proc(struct ghes *ghes, const struct acpi_hest_generic_status *estatus) { int sev, sec_sev; @@ -492,6 +519,7 @@ static void ghes_do_proc(struct ghes *ghes, guid_t *sec_type; const guid_t *fru_id = &guid_null; char *fru_text = ""; + bool queued = false; sev = ghes_severity(estatus->error_severity); apei_estatus_for_each_section(estatus, gdata) { @@ -509,7 +537,7 @@ static void ghes_do_proc(struct ghes *ghes, ghes_edac_report_mem_error(sev, mem_err); arch_apei_report_mem_error(sev, mem_err); - ghes_handle_memory_failure(gdata, sev); + queued = ghes_handle_memory_failure(gdata, sev); } else if (guid_equal(sec_type, &CPER_SEC_PCIE)) { ghes_handle_aer(gdata); @@ -526,6 +554,8 @@ static void ghes_do_proc(struct ghes *ghes, gdata->error_data_length); } } + + return queued; } static void __ghes_print_estatus(const char *pfx, @@ -821,7 +851,9 @@ static void ghes_proc_in_irq(struct irq_work *irq_work) struct ghes_estatus_node *estatus_node; struct acpi_hest_generic *generic; struct acpi_hest_generic_status *estatus; + bool task_work_pending; u32 len, node_len; + int ret; llnode = llist_del_all(&ghes_estatus_llist); /* @@ -836,14 +868,26 @@ static void ghes_proc_in_irq(struct irq_work *irq_work) estatus = GHES_ESTATUS_FROM_NODE(estatus_node); len = cper_estatus_len(estatus); node_len = GHES_ESTATUS_NODE_LEN(len); - ghes_do_proc(estatus_node->ghes, estatus); + task_work_pending = ghes_do_proc(estatus_node->ghes, estatus); if (!ghes_estatus_cached(estatus)) { generic = estatus_node->generic; if (ghes_print_estatus(NULL, generic, estatus)) ghes_estatus_cache_add(generic, estatus); } - gen_pool_free(ghes_estatus_pool, (unsigned long)estatus_node, - node_len); + + if (task_work_pending && current->mm != &init_mm) { + estatus_node->task_work.func = ghes_kick_task_work; + estatus_node->task_work_cpu = smp_processor_id(); + ret = task_work_add(current, &estatus_node->task_work, + true); + if (ret) + estatus_node->task_work.func = NULL; + } + + if (!estatus_node->task_work.func) + gen_pool_free(ghes_estatus_pool, + (unsigned long)estatus_node, node_len); + llnode = next; } } @@ -903,6 +947,7 @@ static int ghes_in_nmi_queue_one_entry(struct ghes *ghes, estatus_node->ghes = ghes; estatus_node->generic = ghes->generic; + estatus_node->task_work.func = NULL; estatus = GHES_ESTATUS_FROM_NODE(estatus_node); if (__ghes_read_estatus(estatus, buf_paddr, fixmap_idx, len)) { |