Re: [PATCH 2/7] acpi, apei, ghes: Introduce more generic mechanism to init/deinit GHES error notifications.
From: Tomasz Nowicki
Date: Thu May 15 2014 - 10:30:53 EST
On 13.05.2014 20:13, Borislav Petkov wrote:
On Wed, Apr 09, 2014 at 05:14:30PM +0200, Tomasz Nowicki wrote:
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@xxxxxxxxxx>
---
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);
+};
Please run through checkpatch before submitting:
WARNING: please, no space before tabs
#44: FILE: drivers/acpi/apei/ghes.c:153:
+^Iint ^I (*init_call)(struct ghes *ghes);$
WARNING: please, no space before tabs
#45: FILE: drivers/acpi/apei/ghes.c:154:
+^Ivoid ^I (*remove_call)(struct ghes *ghes);$
My bad, will run it before next submission.
+
+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;
Unconditionally returning 0 seems kinda moot. At least
register_nmi_handler() retval could be returned...
...
Yes, it's worth returning register_nmi_handler() retval. Nice catch.
+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},
+};
I guess you don't need to save the ->notif_name strings but add
a function which maps ACPI_HEST_* to strings => smaller struct
ghes_notify_setup.
Well, we need to keep these strings somewhere :) IMO, this is simpler
solution. What would be advantage of additional map function?
@@ -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();
What happened to those BUG() catch-all stoppers?
I am validating generic->notify.type at the begin of function and return
error in case of unknown value. I think there is no need to check that
again.
- }
+ 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;
This one too.
For this one I should provide generic->notify.type validation. Will
rethink and fix it.
Tomasz
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