1 files changed, 78 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/iseries/it_lp_queue.h b/arch/powerpc/include/asm/iseries/it_lp_queue.h
new file mode 100644
index 000000000000..428278838821
--- /dev/null
+++ b/arch/powerpc/include/asm/iseries/it_lp_queue.h
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2001  Mike Corrigan IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+#ifndef _ASM_POWERPC_ISERIES_IT_LP_QUEUE_H
+#define _ASM_POWERPC_ISERIES_IT_LP_QUEUE_H
+
+/*
+ *      This control block defines the simple LP queue structure that is
+ *      shared between the hypervisor (PLIC) and the OS in order to send
+ *      events to an LP.
+ */
+
+#include <asm/types.h>
+#include <asm/ptrace.h>
+
+#define IT_LP_MAX_QUEUES        8
+
+#define IT_LP_NOT_USED          0       /* Queue will not be used by PLIC */
+#define IT_LP_DEDICATED_IO      1       /* Queue dedicated to IO processor specified */
+#define IT_LP_DEDICATED_LP      2       /* Queue dedicated to LP specified */
+#define IT_LP_SHARED            3       /* Queue shared for both IO and LP */
+
+#define IT_LP_EVENT_STACK_SIZE  4096
+#define IT_LP_EVENT_MAX_SIZE    256
+#define IT_LP_EVENT_ALIGN       64
+
+struct hvlpevent_queue {
+/*
+ * The hq_current_event is the pointer to the next event stack entry
+ * that will become valid.  The OS must peek at this entry to determine
+ * if it is valid.  PLIC will set the valid indicator as the very last
+ * store into that entry.
+ *
+ * When the OS has completed processing of the event then it will mark
+ * the event as invalid so that PLIC knows it can store into that event
+ * location again.
+ *
+ * If the event stack fills and there are overflow events, then PLIC
+ * will set the hq_overflow_pending flag in which case the OS will
+ * have to fetch the additional LP events once they have drained the
+ * event stack.
+ *
+ * The first 16-bytes are known by both the OS and PLIC.  The remainder
+ * of the cache line is for use by the OS.
+ */
+        u8              hq_overflow_pending;    /* 0x00 Overflow events are pending */
+        u8              hq_status;              /* 0x01 DedicatedIo or DedicatedLp or NotUsed */
+        u16             hq_proc_index;          /* 0x02 Logical Proc Index for correlation */
+        u8              hq_reserved1[12];       /* 0x04 */
+        char            *hq_current_event;      /* 0x10 */
+        char            *hq_last_event;         /* 0x18 */
+        char            *hq_event_stack;        /* 0x20 */
+        u8              hq_index;               /* 0x28 unique sequential index. */
+        u8              hq_reserved2[3];        /* 0x29-2b */
+        spinlock_t      hq_lock;
+};
+
+extern struct hvlpevent_queue hvlpevent_queue;
+
+extern int hvlpevent_is_pending(void);
+extern void process_hvlpevents(void);
+extern void setup_hvlpevent_queue(void);
+
+#endif /* _ASM_POWERPC_ISERIES_IT_LP_QUEUE_H */