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

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>

1 files changed, 13 insertions, 4 deletions

diff --git a/arch/tile/include/asm/processor.h b/arch/tile/include/asm/processor.h
index 34c1e01ffb5e..e85a9af12968 100644
--- a/arch/tile/include/asm/processor.h
+++ b/arch/tile/include/asm/processor.h
@@ -76,6 +76,17 @@ struct async_tlb {
 
 #ifdef CONFIG_HARDWALL
 struct hardwall_info;
+struct hardwall_task {
+        /* Which hardwall is this task tied to? (or NULL if none) */
+        struct hardwall_info *info;
+        /* Chains this task into the list at info->task_head. */
+        struct list_head list;
+};
+#ifdef __tilepro__
+#define HARDWALL_TYPES 1   /* udn */
+#else
+#define HARDWALL_TYPES 3   /* udn, idn, and ipi */
+#endif
 #endif
 
 struct thread_struct {
@@ -116,10 +127,8 @@ struct thread_struct {
         unsigned long dstream_pf;
 #endif
 #ifdef CONFIG_HARDWALL
-        /* Is this task tied to an activated hardwall? */
-        struct hardwall_info *hardwall;
-        /* Chains this task into the list at hardwall->list. */
-        struct list_head hardwall_list;
+        /* Hardwall information for various resources. */
+        struct hardwall_task hardwall[HARDWALL_TYPES];
 #endif
 #if CHIP_HAS_TILE_DMA()
         /* Async DMA TLB fault information */