diff options
Diffstat (limited to 'drivers/edac/ghes_edac.c')
-rw-r--r-- | drivers/edac/ghes_edac.c | 128 |
1 files changed, 80 insertions, 48 deletions
diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c index 0bb62857ffb2..b99080d8a10c 100644 --- a/drivers/edac/ghes_edac.c +++ b/drivers/edac/ghes_edac.c @@ -21,14 +21,22 @@ struct ghes_edac_pvt { struct mem_ctl_info *mci; /* Buffers for the error handling routine */ - char detail_location[240]; - char other_detail[160]; + char other_detail[400]; char msg[80]; }; -static atomic_t ghes_init = ATOMIC_INIT(0); +static refcount_t ghes_refcount = REFCOUNT_INIT(0); + +/* + * Access to ghes_pvt must be protected by ghes_lock. The spinlock + * also provides the necessary (implicit) memory barrier for the SMP + * case to make the pointer visible on another CPU. + */ static struct ghes_edac_pvt *ghes_pvt; +/* GHES registration mutex */ +static DEFINE_MUTEX(ghes_reg_mutex); + /* * Sync with other, potentially concurrent callers of * ghes_edac_report_mem_error(). We don't know what the @@ -79,15 +87,15 @@ static void ghes_edac_count_dimms(const struct dmi_header *dh, void *arg) (*num_dimm)++; } -static int get_dimm_smbios_index(u16 handle) +static int get_dimm_smbios_index(struct mem_ctl_info *mci, u16 handle) { - struct mem_ctl_info *mci = ghes_pvt->mci; - int i; + struct dimm_info *dimm; - for (i = 0; i < mci->tot_dimms; i++) { - if (mci->dimms[i]->smbios_handle == handle) - return i; + mci_for_each_dimm(mci, dimm) { + if (dimm->smbios_handle == handle) + return dimm->idx; } + return -1; } @@ -98,9 +106,7 @@ static void ghes_edac_dmidecode(const struct dmi_header *dh, void *arg) if (dh->type == DMI_ENTRY_MEM_DEVICE) { struct memdev_dmi_entry *entry = (struct memdev_dmi_entry *)dh; - struct dimm_info *dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms, - mci->n_layers, - dimm_fill->count, 0, 0); + struct dimm_info *dimm = edac_get_dimm(mci, dimm_fill->count, 0, 0); u16 rdr_mask = BIT(7) | BIT(13); if (entry->size == 0xffff) { @@ -198,13 +204,9 @@ void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err) enum hw_event_mc_err_type type; struct edac_raw_error_desc *e; struct mem_ctl_info *mci; - struct ghes_edac_pvt *pvt = ghes_pvt; + struct ghes_edac_pvt *pvt; unsigned long flags; char *p; - u8 grain_bits; - - if (!pvt) - return; /* * We can do the locking below because GHES defers error processing @@ -216,12 +218,17 @@ void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err) spin_lock_irqsave(&ghes_lock, flags); + pvt = ghes_pvt; + if (!pvt) + goto unlock; + mci = pvt->mci; e = &mci->error_desc; /* Cleans the error report buffer */ memset(e, 0, sizeof (*e)); e->error_count = 1; + e->grain = 1; strcpy(e->label, "unknown label"); e->msg = pvt->msg; e->other_detail = pvt->other_detail; @@ -311,13 +318,13 @@ void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err) /* Error address */ if (mem_err->validation_bits & CPER_MEM_VALID_PA) { - e->page_frame_number = mem_err->physical_addr >> PAGE_SHIFT; - e->offset_in_page = mem_err->physical_addr & ~PAGE_MASK; + e->page_frame_number = PHYS_PFN(mem_err->physical_addr); + e->offset_in_page = offset_in_page(mem_err->physical_addr); } /* Error grain */ if (mem_err->validation_bits & CPER_MEM_VALID_PA_MASK) - e->grain = ~(mem_err->physical_addr_mask & ~PAGE_MASK); + e->grain = ~mem_err->physical_addr_mask + 1; /* Memory error location, mapped on e->location */ p = e->location; @@ -348,7 +355,7 @@ void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err) p += sprintf(p, "DIMM DMI handle: 0x%.4x ", mem_err->mem_dev_handle); - index = get_dimm_smbios_index(mem_err->mem_dev_handle); + index = get_dimm_smbios_index(mci, mem_err->mem_dev_handle); if (index >= 0) { e->top_layer = index; e->enable_per_layer_report = true; @@ -360,6 +367,8 @@ void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err) /* All other fields are mapped on e->other_detail */ p = pvt->other_detail; + p += snprintf(p, sizeof(pvt->other_detail), + "APEI location: %s ", e->location); if (mem_err->validation_bits & CPER_MEM_VALID_ERROR_STATUS) { u64 status = mem_err->error_status; @@ -433,16 +442,9 @@ void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err) if (p > pvt->other_detail) *(p - 1) = '\0'; - /* Generate the trace event */ - grain_bits = fls_long(e->grain); - snprintf(pvt->detail_location, sizeof(pvt->detail_location), - "APEI location: %s %s", e->location, e->other_detail); - trace_mc_event(type, e->msg, e->label, e->error_count, - mci->mc_idx, e->top_layer, e->mid_layer, e->low_layer, - (e->page_frame_number << PAGE_SHIFT) | e->offset_in_page, - grain_bits, e->syndrome, pvt->detail_location); - edac_raw_mc_handle_error(type, mci, e); + +unlock: spin_unlock_irqrestore(&ghes_lock, flags); } @@ -457,10 +459,12 @@ static struct acpi_platform_list plat_list[] = { int ghes_edac_register(struct ghes *ghes, struct device *dev) { bool fake = false; - int rc, num_dimm = 0; + int rc = 0, num_dimm = 0; struct mem_ctl_info *mci; + struct ghes_edac_pvt *pvt; struct edac_mc_layer layers[1]; struct ghes_edac_dimm_fill dimm_fill; + unsigned long flags; int idx = -1; if (IS_ENABLED(CONFIG_X86)) { @@ -472,11 +476,14 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev) idx = 0; } + /* finish another registration/unregistration instance first */ + mutex_lock(&ghes_reg_mutex); + /* * We have only one logical memory controller to which all DIMMs belong. */ - if (atomic_inc_return(&ghes_init) > 1) - return 0; + if (refcount_inc_not_zero(&ghes_refcount)) + goto unlock; /* Get the number of DIMMs */ dmi_walk(ghes_edac_count_dimms, &num_dimm); @@ -494,12 +501,13 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev) mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, sizeof(struct ghes_edac_pvt)); if (!mci) { pr_info("Can't allocate memory for EDAC data\n"); - return -ENOMEM; + rc = -ENOMEM; + goto unlock; } - ghes_pvt = mci->pvt_info; - ghes_pvt->ghes = ghes; - ghes_pvt->mci = mci; + pvt = mci->pvt_info; + pvt->ghes = ghes; + pvt->mci = mci; mci->pdev = dev; mci->mtype_cap = MEM_FLAG_EMPTY; @@ -527,8 +535,7 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev) dimm_fill.mci = mci; dmi_walk(ghes_edac_dmidecode, &dimm_fill); } else { - struct dimm_info *dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms, - mci->n_layers, 0, 0, 0); + struct dimm_info *dimm = edac_get_dimm(mci, 0, 0, 0); dimm->nr_pages = 1; dimm->grain = 128; @@ -541,23 +548,48 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev) if (rc < 0) { pr_info("Can't register at EDAC core\n"); edac_mc_free(mci); - return -ENODEV; + rc = -ENODEV; + goto unlock; } - return 0; + + spin_lock_irqsave(&ghes_lock, flags); + ghes_pvt = pvt; + spin_unlock_irqrestore(&ghes_lock, flags); + + /* only set on success */ + refcount_set(&ghes_refcount, 1); + +unlock: + mutex_unlock(&ghes_reg_mutex); + + return rc; } void ghes_edac_unregister(struct ghes *ghes) { struct mem_ctl_info *mci; + unsigned long flags; - if (!ghes_pvt) - return; + mutex_lock(&ghes_reg_mutex); - if (atomic_dec_return(&ghes_init)) - return; + if (!refcount_dec_and_test(&ghes_refcount)) + goto unlock; - mci = ghes_pvt->mci; + /* + * Wait for the irq handler being finished. + */ + spin_lock_irqsave(&ghes_lock, flags); + mci = ghes_pvt ? ghes_pvt->mci : NULL; ghes_pvt = NULL; - edac_mc_del_mc(mci->pdev); - edac_mc_free(mci); + spin_unlock_irqrestore(&ghes_lock, flags); + + if (!mci) + goto unlock; + + mci = edac_mc_del_mc(mci->pdev); + if (mci) + edac_mc_free(mci); + +unlock: + mutex_unlock(&ghes_reg_mutex); } |