| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Wed, 9 Apr 2014 17:14:30 +0200
From: Tomasz Nowicki <tomasz.nowicki@...aro.org>
To: rjw@...ysocki.net, lenb@...nel.org, tony.luck@...el.com,
bp@...en8.de, bp@...e.de, m.chehab@...sung.com
Cc: linux-edac@...r.kernel.org, x86@...nel.org,
linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
linaro-acpi@...ts.linaro.org,
Tomasz Nowicki <tomasz.nowicki@...aro.org>
Subject: [PATCH 2/7] acpi, apei, ghes: Introduce more generic mechanism to init/deinit GHES error notifications.
Init/deinit of GHES error notifications are moved to corresponding
functions e.g. for SCI ghes_notify_init_sci{sci} and ghes_notify_remove_{sci}
which in turn are gathered to ghes_notify_tab table.
ghes_probe and ghes_remove check notification support based on
function reference pointer in ghes_notify_tab and call it with ghes argument.
This approach allows us to change address of a given error notification
init/deinit function call in ghes_notify_tab in runtime. In turn,
we can avoid #ifdef usage in common code e.g. for NMI which is currently
supported by x86.
Signed-off-by: Tomasz Nowicki <tomasz.nowicki@...aro.org>
---
drivers/acpi/apei/ghes.c | 242 ++++++++++++++++++++++++++++------------------
1 file changed, 149 insertions(+), 93 deletions(-)
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index f7edffc..ca8387e 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -148,6 +148,14 @@ static struct irq_work ghes_proc_irq_work;
struct ghes_estatus_cache *ghes_estatus_caches[GHES_ESTATUS_CACHES_SIZE];
static atomic_t ghes_estatus_cache_alloced;
+struct ghes_notify_setup {
+ const char *notif_name;
+ int (*init_call)(struct ghes *ghes);
+ void (*remove_call)(struct ghes *ghes);
+};
+
+static struct ghes_notify_setup ghes_notify_tab[];
+
static int ghes_ioremap_init(void)
{
ghes_ioremap_area = __get_vm_area(PAGE_SIZE * GHES_IOREMAP_PAGES,
@@ -879,10 +887,6 @@ out:
return ret;
}
-static struct notifier_block ghes_notifier_sci = {
- .notifier_call = ghes_notify_sci,
-};
-
static unsigned long ghes_esource_prealloc_size(
const struct acpi_hest_generic *generic)
{
@@ -898,33 +902,151 @@ static unsigned long ghes_esource_prealloc_size(
return prealloc_size;
}
+static int ghes_notify_init_nmi(struct ghes *ghes)
+{
+ unsigned long len;
+
+ len = ghes_esource_prealloc_size(ghes->generic);
+ ghes_estatus_pool_expand(len);
+ mutex_lock(&ghes_list_mutex);
+ if (list_empty(&ghes_nmi))
+ register_nmi_handler(NMI_LOCAL, ghes_notify_nmi, 0, "ghes");
+ list_add_rcu(&ghes->list, &ghes_nmi);
+ mutex_unlock(&ghes_list_mutex);
+
+ return 0;
+}
+
+static void ghes_notify_remove_nmi(struct ghes *ghes)
+{
+ unsigned long len;
+
+ mutex_lock(&ghes_list_mutex);
+ list_del_rcu(&ghes->list);
+ if (list_empty(&ghes_nmi))
+ unregister_nmi_handler(NMI_LOCAL, "ghes");
+ mutex_unlock(&ghes_list_mutex);
+ /*
+ * To synchronize with NMI handler, ghes can only be
+ * freed after NMI handler finishes.
+ */
+ synchronize_rcu();
+ len = ghes_esource_prealloc_size(ghes->generic);
+ ghes_estatus_pool_shrink(len);
+}
+
+static int ghes_notify_init_polled(struct ghes *ghes)
+{
+ ghes->timer.function = ghes_poll_func;
+ ghes->timer.data = (unsigned long)ghes;
+ init_timer_deferrable(&ghes->timer);
+ ghes_add_timer(ghes);
+
+ return 0;
+}
+
+static void ghes_notify_remove_polled(struct ghes *ghes)
+{
+ del_timer_sync(&ghes->timer);
+}
+
+static int ghes_notify_init_external(struct ghes *ghes)
+{
+ int rc;
+
+ /* External interrupt vector is GSI */
+ rc = acpi_gsi_to_irq(ghes->generic->notify.vector, &ghes->irq);
+ if (rc) {
+ pr_err(GHES_PFX "Failed to map GSI to IRQ for generic hardware "
+ "error source: %d\n", ghes->generic->header.source_id);
+ goto out;
+ }
+
+ rc = request_irq(ghes->irq, ghes_irq_func, 0, "GHES IRQ", ghes);
+ if (rc)
+ pr_err(GHES_PFX "Failed to register IRQ for generic hardware "
+ "error source: %d\n", ghes->generic->header.source_id);
+
+out:
+ return rc;
+}
+
+static void ghes_notify_remove_external(struct ghes *ghes)
+{
+ free_irq(ghes->irq, ghes);
+}
+
+static struct notifier_block ghes_notifier_sci = {
+ .notifier_call = ghes_notify_sci,
+};
+
+static int ghes_notify_init_sci(struct ghes *ghes)
+{
+ mutex_lock(&ghes_list_mutex);
+ if (list_empty(&ghes_sci))
+ register_acpi_hed_notifier(&ghes_notifier_sci);
+ list_add_rcu(&ghes->list, &ghes_sci);
+ mutex_unlock(&ghes_list_mutex);
+
+ return 0;
+}
+
+static void ghes_notify_remove_sci(struct ghes *ghes)
+{
+ mutex_lock(&ghes_list_mutex);
+ list_del_rcu(&ghes->list);
+ if (list_empty(&ghes_sci))
+ unregister_acpi_hed_notifier(&ghes_notifier_sci);
+ mutex_unlock(&ghes_list_mutex);
+}
+
+static struct ghes_notify_setup
+ ghes_notify_tab[ACPI_HEST_NOTIFY_RESERVED] = {
+ [ACPI_HEST_NOTIFY_POLLED] = {"POLLED",
+ ghes_notify_init_polled,
+ ghes_notify_remove_polled},
+ [ACPI_HEST_NOTIFY_EXTERNAL] = {"EXT_IRQ",
+ ghes_notify_init_external,
+ ghes_notify_remove_external},
+ [ACPI_HEST_NOTIFY_LOCAL] = {"LOCAL_IRQ", NULL, NULL},
+ [ACPI_HEST_NOTIFY_SCI] = {"SCI",
+ ghes_notify_init_sci,
+ ghes_notify_remove_sci},
+ [ACPI_HEST_NOTIFY_NMI] = {"NMI",
+ ghes_notify_init_nmi,
+ ghes_notify_remove_nmi},
+ [ACPI_HEST_NOTIFY_CMCI] = {"CMCI", NULL, NULL},
+ [ACPI_HEST_NOTIFY_MCE] = {"MCE", NULL, NULL},
+};
+
static int ghes_probe(struct platform_device *ghes_dev)
{
struct acpi_hest_generic *generic;
struct ghes *ghes = NULL;
- unsigned long len;
int rc = -EINVAL;
+ int (*ghes_init_call)(struct ghes *ghes);
+ const char *ghes_notif_name;
generic = *(struct acpi_hest_generic **)ghes_dev->dev.platform_data;
if (!generic->enabled)
return -ENODEV;
- switch (generic->notify.type) {
- case ACPI_HEST_NOTIFY_POLLED:
- case ACPI_HEST_NOTIFY_EXTERNAL:
- case ACPI_HEST_NOTIFY_SCI:
- case ACPI_HEST_NOTIFY_NMI:
- break;
- case ACPI_HEST_NOTIFY_LOCAL:
- pr_warning(GHES_PFX "Generic hardware error source: %d notified via local interrupt is not supported!\n",
- generic->header.source_id);
- goto err;
- default:
- pr_warning(FW_WARN GHES_PFX "Unknown notification type: %u for generic hardware error source: %d\n",
+ if (generic->notify.type >= ACPI_HEST_NOTIFY_RESERVED) {
+ pr_warning(FW_WARN GHES_PFX "Unknown notification type: %u for "
+ "generic hardware error source: %d\n",
generic->notify.type, generic->header.source_id);
goto err;
}
+ ghes_init_call = ghes_notify_tab[generic->notify.type].init_call;
+ ghes_notif_name = ghes_notify_tab[generic->notify.type].notif_name;
+ if (!ghes_init_call) {
+ pr_warning(GHES_PFX "Generic hardware error source: %d notified"
+ " via %s is not supported!\n",
+ generic->header.source_id, ghes_notif_name);
+ goto err;
+ }
+
rc = -EIO;
if (generic->error_block_length <
sizeof(struct acpi_generic_status)) {
@@ -944,48 +1066,10 @@ static int ghes_probe(struct platform_device *ghes_dev)
if (rc < 0)
goto err;
- switch (generic->notify.type) {
- case ACPI_HEST_NOTIFY_POLLED:
- ghes->timer.function = ghes_poll_func;
- ghes->timer.data = (unsigned long)ghes;
- init_timer_deferrable(&ghes->timer);
- ghes_add_timer(ghes);
- break;
- case ACPI_HEST_NOTIFY_EXTERNAL:
- /* External interrupt vector is GSI */
- rc = acpi_gsi_to_irq(generic->notify.vector, &ghes->irq);
- if (rc) {
- pr_err(GHES_PFX "Failed to map GSI to IRQ for generic hardware error source: %d\n",
- generic->header.source_id);
- goto err_edac_unreg;
- }
- rc = request_irq(ghes->irq, ghes_irq_func, 0, "GHES IRQ", ghes);
- if (rc) {
- pr_err(GHES_PFX "Failed to register IRQ for generic hardware error source: %d\n",
- generic->header.source_id);
- goto err_edac_unreg;
- }
- break;
- case ACPI_HEST_NOTIFY_SCI:
- mutex_lock(&ghes_list_mutex);
- if (list_empty(&ghes_sci))
- register_acpi_hed_notifier(&ghes_notifier_sci);
- list_add_rcu(&ghes->list, &ghes_sci);
- mutex_unlock(&ghes_list_mutex);
- break;
- case ACPI_HEST_NOTIFY_NMI:
- len = ghes_esource_prealloc_size(generic);
- ghes_estatus_pool_expand(len);
- mutex_lock(&ghes_list_mutex);
- if (list_empty(&ghes_nmi))
- register_nmi_handler(NMI_LOCAL, ghes_notify_nmi, 0,
- "ghes");
- list_add_rcu(&ghes->list, &ghes_nmi);
- mutex_unlock(&ghes_list_mutex);
- break;
- default:
- BUG();
- }
+ rc = (*ghes_init_call)(ghes);
+ if (rc)
+ goto err_edac_unreg;
+
platform_set_drvdata(ghes_dev, ghes);
return 0;
@@ -1003,44 +1087,16 @@ static int ghes_remove(struct platform_device *ghes_dev)
{
struct ghes *ghes;
struct acpi_hest_generic *generic;
- unsigned long len;
+ void (*ghes_remove_call)(struct ghes *ghes);
ghes = platform_get_drvdata(ghes_dev);
+ ghes->flags |= GHES_EXITING;
+
generic = ghes->generic;
+ ghes_remove_call = ghes_notify_tab[generic->notify.type].remove_call;
- ghes->flags |= GHES_EXITING;
- switch (generic->notify.type) {
- case ACPI_HEST_NOTIFY_POLLED:
- del_timer_sync(&ghes->timer);
- break;
- case ACPI_HEST_NOTIFY_EXTERNAL:
- free_irq(ghes->irq, ghes);
- break;
- case ACPI_HEST_NOTIFY_SCI:
- mutex_lock(&ghes_list_mutex);
- list_del_rcu(&ghes->list);
- if (list_empty(&ghes_sci))
- unregister_acpi_hed_notifier(&ghes_notifier_sci);
- mutex_unlock(&ghes_list_mutex);
- break;
- case ACPI_HEST_NOTIFY_NMI:
- mutex_lock(&ghes_list_mutex);
- list_del_rcu(&ghes->list);
- if (list_empty(&ghes_nmi))
- unregister_nmi_handler(NMI_LOCAL, "ghes");
- mutex_unlock(&ghes_list_mutex);
- /*
- * To synchronize with NMI handler, ghes can only be
- * freed after NMI handler finishes.
- */
- synchronize_rcu();
- len = ghes_esource_prealloc_size(generic);
- ghes_estatus_pool_shrink(len);
- break;
- default:
- BUG();
- break;
- }
+ if (ghes_remove_call)
+ (*ghes_remove_call)(ghes);
ghes_fini(ghes);
--
1.7.9.5
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists