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arch/tile: fix hardwall for tilegx and generalize for idn and ipi

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The hardwall drain code was not properly implemented for tilegx,
just tilepro, so you couldn't reliably restart an application that
made use of the udn.

In addition, the code was only applicable to the udn (user dynamic
network).  On tilegx there is a second user network that is available
(the "idn"), and there is support for having I/O shims deliver
user-level interrupts to applications ("ipi") which functions in a
very similar way to the inter-core permissions used for udn/idn.
So this change also generalizes the code from supporting just the udn
to supports udn/idn/ipi on tilegx.

By default we now use /dev/hardwall/{udn,idn,ipi} with separate
minor numbers for the three devices.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf
2012-03-30 16:01:48 -04:00
parent 621b195515
commit b8ace0833f
8 changed files with 635 additions and 279 deletions
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16
arch/tile/kernel/process.c
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@@ -145,10 +145,10 @@ void free_thread_info(struct thread_info *info)
* Calling deactivate here just frees up the data structures.
* If the task we're freeing held the last reference to a
* hardwall fd, it would have been released prior to this point
* anyway via exit_files(), and "hardwall" would be NULL by now.
* anyway via exit_files(), and the hardwall_task.info pointers
* would be NULL by now.
*/
if (info->task->thread.hardwall)
hardwall_deactivate(info->task);
hardwall_deactivate_all(info->task);
#endif
if (step_state) {
@@ -264,7 +264,8 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
#ifdef CONFIG_HARDWALL
/* New thread does not own any networks. */
p->thread.hardwall = NULL;
memset(&p->thread.hardwall[0], 0,
sizeof(struct hardwall_task) * HARDWALL_TYPES);
#endif
@@ -534,12 +535,7 @@ struct task_struct *__sched _switch_to(struct task_struct *prev,
#ifdef CONFIG_HARDWALL
/* Enable or disable access to the network registers appropriately. */
if (prev->thread.hardwall != NULL) {
if (next->thread.hardwall == NULL)
restrict_network_mpls();
} else if (next->thread.hardwall != NULL) {
grant_network_mpls();
}
hardwall_switch_tasks(prev, next);
#endif
/*