From 79ca27706a034b683196c85f5c6901b78e5ab8f0 Mon Sep 17 00:00:00 2001
From: Ben Skeggs <bskeggs@redhat.com>
Date: Sun, 10 Aug 2014 04:10:20 +1000
Subject: drm/nouveau/core: rework event interface

This is a lot of prep-work for being able to send event notifications
back to userspace.  Events now contain data, rather than a "something
just happened" signal.

Handler data is now embedded into a containing structure, rather than
being kmalloc()'d, and can optionally have the notify routine handled
in a workqueue.

Various races between suspend/unload with display HPD/DP IRQ handlers
automagically solved as a result.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
---
 drivers/gpu/drm/nouveau/nvif/event.h  | 28 ++++++++++++++++++++++++++++
 drivers/gpu/drm/nouveau/nvif/unpack.h | 24 ++++++++++++++++++++++++
 2 files changed, 52 insertions(+)
 create mode 100644 drivers/gpu/drm/nouveau/nvif/event.h
 create mode 100644 drivers/gpu/drm/nouveau/nvif/unpack.h

(limited to 'drivers/gpu/drm/nouveau/nvif')

diff --git a/drivers/gpu/drm/nouveau/nvif/event.h b/drivers/gpu/drm/nouveau/nvif/event.h
new file mode 100644
index 0000000..6daced0
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvif/event.h
@@ -0,0 +1,28 @@
+#ifndef __NVIF_EVENT_H__
+#define __NVIF_EVENT_H__
+
+struct nvif_notify_head_req_v0 {
+	__u8  version;
+	__u8  head;
+};
+
+struct nvif_notify_head_rep_v0 {
+	__u8  version;
+};
+
+struct nvif_notify_conn_req_v0 {
+	__u8  version;
+#define NVIF_NOTIFY_CONN_V0_PLUG                                           0x01
+#define NVIF_NOTIFY_CONN_V0_UNPLUG                                         0x02
+#define NVIF_NOTIFY_CONN_V0_IRQ                                            0x04
+#define NVIF_NOTIFY_CONN_V0_ANY                                            0x07
+	__u8  mask;
+	__u8  conn;
+};
+
+struct nvif_notify_conn_rep_v0 {
+	__u8  version;
+	__u8  mask;
+};
+
+#endif
diff --git a/drivers/gpu/drm/nouveau/nvif/unpack.h b/drivers/gpu/drm/nouveau/nvif/unpack.h
new file mode 100644
index 0000000..5933188
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvif/unpack.h
@@ -0,0 +1,24 @@
+#ifndef __NVIF_UNPACK_H__
+#define __NVIF_UNPACK_H__
+
+#define nvif_unvers(d) ({                                                      \
+	ret = (size == sizeof(d)) ? 0 : -ENOSYS;                               \
+	(ret == 0);                                                            \
+})
+
+#define nvif_unpack(d,vl,vh,m) ({                                              \
+	if ((vl) == 0 || ret == -ENOSYS) {                                     \
+		int _size = sizeof(d);                                         \
+		if (_size <= size && (d).version >= (vl) &&                    \
+				     (d).version <= (vh)) {                    \
+			data = (u8 *)data + _size;                             \
+			size = size - _size;                                   \
+			ret = ((m) || !size) ? 0 : -E2BIG;                     \
+		} else {                                                       \
+			ret = -ENOSYS;                                         \
+		}                                                              \
+	}                                                                      \
+	(ret == 0);                                                            \
+})
+
+#endif
-- 
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