vme: change bus error handling scheme
The current VME bus error handler adds errors to the bridge error list.
vme_master_{read,write} then traverses that list to look for relevant
errors.
Such scheme didn't work well for accesses going through vme_master_mmap
because they would also allocate a vme_bus_error, but have no way to do
vme_clear_errors call to free that memory.
This changes the error handling process to be other way around: now
vme_master_{read,write} defines a window in VME address space that will
catch possible errors. VME bus error interrupt only traverses these
windows and marks those that had errors in them.
Signed-off-by: Dmitry Kalinkin <dmitry.kalinkin@gmail.com>
Cc: Igor Alekseev <igor.alekseev@itep.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/vme/vme.c b/drivers/vme/vme.c
index 2b79cd2..7a10d92 100644
--- a/drivers/vme/vme.c
+++ b/drivers/vme/vme.c
@@ -1026,76 +1026,52 @@
void vme_bus_error_handler(struct vme_bridge *bridge,
unsigned long long address, int am)
{
- struct vme_bus_error *error;
+ struct list_head *handler_pos = NULL;
+ struct vme_error_handler *handler;
+ u32 aspace = vme_get_aspace(am);
- error = kmalloc(sizeof(struct vme_bus_error), GFP_ATOMIC);
- if (error) {
- error->aspace = vme_get_aspace(am);
- error->address = address;
- list_add_tail(&error->list, &bridge->vme_errors);
- } else {
- dev_err(bridge->parent,
- "Unable to alloc memory for VMEbus Error reporting\n");
+ list_for_each(handler_pos, &bridge->vme_error_handlers) {
+ handler = list_entry(handler_pos, struct vme_error_handler,
+ list);
+ if ((aspace == handler->aspace) &&
+ (address >= handler->start) &&
+ (address < handler->end)) {
+ if (!handler->num_errors)
+ handler->first_error = address;
+ if (handler->num_errors != UINT_MAX)
+ handler->num_errors++;
+ }
}
}
EXPORT_SYMBOL(vme_bus_error_handler);
-/*
- * Find the first error in this address range
- */
-struct vme_bus_error *vme_find_error(struct vme_bridge *bridge, u32 aspace,
- unsigned long long address, size_t count)
+struct vme_error_handler *vme_register_error_handler(
+ struct vme_bridge *bridge, u32 aspace,
+ unsigned long long address, size_t len)
{
- struct list_head *err_pos;
- struct vme_bus_error *vme_err, *valid = NULL;
- unsigned long long bound;
+ struct vme_error_handler *handler;
- bound = address + count;
+ handler = kmalloc(sizeof(*handler), GFP_KERNEL);
+ if (!handler)
+ return NULL;
- err_pos = NULL;
- /* Iterate through errors */
- list_for_each(err_pos, &bridge->vme_errors) {
- vme_err = list_entry(err_pos, struct vme_bus_error, list);
- if ((vme_err->aspace == aspace) &&
- (vme_err->address >= address) &&
- (vme_err->address < bound)) {
+ handler->aspace = aspace;
+ handler->start = address;
+ handler->end = address + len;
+ handler->num_errors = 0;
+ handler->first_error = 0;
+ list_add_tail(&handler->list, &bridge->vme_error_handlers);
- valid = vme_err;
- break;
- }
- }
-
- return valid;
+ return handler;
}
-EXPORT_SYMBOL(vme_find_error);
+EXPORT_SYMBOL(vme_register_error_handler);
-/*
- * Clear errors in the provided address range.
- */
-void vme_clear_errors(struct vme_bridge *bridge, u32 aspace,
- unsigned long long address, size_t count)
+void vme_unregister_error_handler(struct vme_error_handler *handler)
{
- struct list_head *err_pos, *temp;
- struct vme_bus_error *vme_err;
- unsigned long long bound;
-
- bound = address + count;
-
- err_pos = NULL;
- /* Iterate through errors */
- list_for_each_safe(err_pos, temp, &bridge->vme_errors) {
- vme_err = list_entry(err_pos, struct vme_bus_error, list);
-
- if ((vme_err->aspace == aspace) &&
- (vme_err->address >= address) &&
- (vme_err->address < bound)) {
-
- list_del(err_pos);
- kfree(vme_err);
- }
- }
+ list_del(&handler->list);
+ kfree(handler);
}
-EXPORT_SYMBOL(vme_clear_errors);
+EXPORT_SYMBOL(vme_unregister_error_handler);
void vme_irq_handler(struct vme_bridge *bridge, int level, int statid)
{